WorldWideScience

Sample records for blanca piaractus brachypomus

  1. Toxicidad aguda del sulfato de cobre (CuSO4) en alevinos de cachama blanca (Piaractus brachypomus) bajo condiciones de aguas blandas

    DEFF Research Database (Denmark)

    Velasco-Santamaría, Yohana M.; Gómez-Manrique, Wilson; Calderón-Bernal, Juan M.

    2006-01-01

    To preliminarily determine acute CuSO4 toxicity in cachama blanca (Piaractus brachypomus) fingerlings, 110 individuals were exposed to seven different concentrations: 0 (control), 0.25, 0.50, 1.00, 1.50, 2.00 and 4.00 ppm using semi-static system aquariums. Water hardness in reference to CaCO3 wa...

  2. Estudio histológico del sistema digestivo en diferentes estadios de desarrollo de la cachama blanca (Piaractus brachypomus

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Mendoza R.

    2013-06-01

    Full Text Available La cachama blanca (Piaractus brachypomus es la segunda fuente de producción piscícola en Colombia, después de la tilapia roja (Oreochomi ssp. y antes de la trucha arcoíris (Oncorhynchus mykiss. Se destaca, además, como una de las especies con mayor potencial productivo en el país. Se realizó el estudio histológico del sistema digestivo de la Piaractus brachypomus a fin determinar la morfología normal en diferentes estadios de desarrollo. Para ello se clasificaron los animales según la edad, el tamaño y el peso en ovas embrionadas, larvas con saco vitelino, alevinos después de reabsorción de saco vitelino, juveniles (3-5 cm, 5-7 cm, 10 cm, 15 cm y adultos (300 g. La fijación de los tejidos se realizó en formaldehído al 3,7 % y se describió microscópicamente cavidad bucal, faringe, esófago, estómago, ciegos pilóricos, intestinos y las glándulas anexas, hígado y páncreas. Por último, se describió macroscópicamente la organización anatómica de este sistema.

  3. Acute toxicity and histopathological alterations of Roundup® herbicide on "cachama blanca" (Piaractus brachypomus Toxicidade aguda e alterações histopatológicas induzidas pelo herbicida Roundup® em pirapitinga (Piaractus brachypomus

    Directory of Open Access Journals (Sweden)

    Wilson F. Ramírez-Duarte

    2008-11-01

    Full Text Available Acute toxicity of the glyphosate -N (phosphonomethyl glycine- herbicide, Roundup®, in juveniles of cachama blanca, (Piaractus brachypomus, was evaluated and the histopathological lesions were assessed. The 96 h lethal concentration 50 was 97.47mg.L-1 (PEste estudo avaliou a toxicidade aguda e as alterações histopatológicas induzidas pelo glifosato -N (fosfometil glicina, na formulação Roundup® em juvenis de pirapitinga (Piaractus brachypomus expostos durante 96 horas. A concentração letal 50 foi de 97.47mg.L-1 (P<0.05. Nas brânquias foram achadas lesões proliferativas e necróticas. No fígado foi observada congestão, processos degenerativos, gotas hialinas e presença de vacúolos lipídicos nos hepatócitos. No estomago e na pele foi detectada hiperplasia ligeira das células de moco. Nesta ultima, adicionalmente foi observado engrossamento da epidermes com lesões necróticas, infiltração de células leucocitárias e acumulação de melanina. No cérebro foram observados focos de degeneração de somas neurais na região do telencéfalo junto com gliose e infiltração de células granulais eosinofilicas/células mast. Concluindo, as brânquias, o fígado, a pele e o cérebro são órgãos suscetíveis ao Roundup®. Adicionalmente, os efeitos sobre o sistema nervoso central poderiam reduzir a olfação nos peixes, tanto como o comportamento grupal e individual, a performance reprodutivo e desta forma, repercutir no nível populacional.

  4. Evaluación del tiempo de evacuación gástrica de la cachama blanca piaractus brachypomus (cuvier, 1818), utilizando diferentes frecuencias de alimentación y ayuno

    OpenAIRE

    Gomez Peñaranda, Jose Ader; Clavijo Restrepo, Laura Cristina

    2014-01-01

    Este estudio estima el tiempo de vaciado del estómago de la cachama blanca (Piaractus brachypomus) en el día de comienzo regular de alimentación posterior a un periodo de ayuno. Para el efecto, se recolectaron muestras de contenido estomacal en periodos de dos horas después del suministro de alimento (9:30 y 15:30 h) hasta el primer indicio de vaciado. Se utilizaron cachamas con un peso de 360 ± 12 g dispuestas en cuatro tratamientos: (1) T1 = alimentación a saciedad durante 5 días y ayuno de...

  5. EFICIENCIA ANÉSTESICA DE 2-FENOXIETANOL, BENZOCAINA, QUINALDINA Y METASULFONATO DE TRICAINA EN ALEVINOS Y JUVENILES DE CACHAMA BLANCA (Piaractus brachypomus

    Directory of Open Access Journals (Sweden)

    Yohana Velasco-Santamaría

    2008-12-01

    Full Text Available Objetivo. Evaluar la efectividad anestésica de 2-fenoxietanol, benzocaina, quinaldina y metanosulfonato de tricaina (MS-222 en alevinos y juveniles de cachama blanca (Piaractus brachypomus. Materiales y métodos. Alevinos (7.3 ± 6.8 g y juveniles (49.6 ± 28.4 g fueron expuestos a 2-fenoxietanol (200, 400 y 600 ppm, benzocaina (50, 100 y 150 ppm, quinaldina (7.5, 15 y 30 ppm o MS-222 (100, 150 y 200 ppm (n=12, para evaluar la duración de la inducción y recuperación, frecuencia opercular y la sobrevivencia post-anestesia. Resultados. El desarrollo corporal y la concentración afectaron el periodo de inducción, siendo mayor en juveniles que en alevinos (p0.05, mientras que juveniles expuestos a MS-222 mostraron el menor tiempo de inducción con la menor concentración (p<0.05. El tiempo de recuperación fue inferior a 2 min, con 2-fenoxietanol, MS-222, quinaldina y 50 ppm de benzocaina; pero altas concentraciones de benzocaina mostraron largos períodos de recuperación. No se observó tendencia en la variación de la frecuencia opercular ni mortalidad durante o después de la exposición a los anestésicos. Conclusiones. En alevinos el 2- fenoxietanol (400 ppm y en juveniles el MS-222 (100 ppm, serían las sustancias de elección para procedimientos cortos, pero deberá recurrirse a altas concentraciones de benzocaina cuando el propósito de la anestesia sea un procedimiento prolongado.

  6. TOXICIDAD AGUDA Y LESIONES HISTOPATOLÓGICAS EN CACHAMA BLANCA (Piaractus brachypomus EXPUESTAS A LA MEZCLA DE HERBICIDA ROUNDUP® MÁS SURFACTANTE COSMOFLUX® 411F

    Directory of Open Access Journals (Sweden)

    Pedro Eslava M

    2009-04-01

    Full Text Available Objetivo. Determinar la concentración letal 50 (CL50 y lesiones anatomopatológicas inducidas por la exposición a la mezcla del herbicida Roundup® más el surfactante Cosmoflux® 411F en juveniles de cachama blanca (Piaractus brachypomus. Materiales y métodos. Ejemplares de 44.5 ± 3.7 g de peso fueron expuestos por 96 h a varias concentraciones de la mezcla herbicida más surfactante. Se registró la mortalidad al cabo de las 96 h y se tomaron muestras de tejidos para evaluación histopatológica. Resultados. La CL50 fue de 23.42 mg.l-1 para el Roundup® y de 0.19 mg.l-1 para el Cosmoflux® 411F (p<0.05 en la mezcla. En las branquias se hallaron lesiones necróticas proliferativas, y aneurismas y hemorragias en las lamelas. En el hígado se observaron procesos apoptóticos y necróticos de los hepatocitos, vacuolización lipídica y gotas hialinas citoplasmáticas en los mismos. En el telencéfalo se halló necrosis y apoptosis de cuerpos neuronales asociados y no asociados a células granulares eosinofílicas/células mast, y gliosis. En el intestino se evidenció vacuolización del borde apical de los enterocitos, e infiltración leucocitaria en la lámina propia. En la piel se halló hiperplasia e hipertrofia de células pavimentosas y células de moco, infiltración leucocitaria epidermal y acumulación subepidermal de pigmentos. En el riñón caudal se observaron hemorragias y lesiones necróticas multifocales. Conclusiones. La mezcla Roundup® más Cosmoflux® 411F ocasiona lesiones histopatológicas en branquias, piel, cerebro, hígado, intestino anterior y riñón caudal en juveniles de cachama blanca expuestos a las concentraciones y proporción evaluadas.

  7. Análisis proximal, evaluación microbiológica y sensorial de carnes para hamburguesas elaboradas con cachama blanca (Piaractus brachypomus y soya (Glycine max texturizada

    Directory of Open Access Journals (Sweden)

    Oscar García

    2013-12-01

    Full Text Available La cachama blanca (Piaractus brachypomus es una especie económicamente importante en la acuicultura continental de América Latina y una alternativa nacional de producción de pescado para la piscicultura, la industria y el consumo. El objetivo del presente trabajo de investigación fue caracterizar mediante análisis proximal, evaluación microbiológica y sensorial, carnes para hamburguesas elaboradas con pulpa de cachama y diferentes inclusiones porcentuales de harina de soya texturizada (HST (0, 3, 6 y 9 %. Se realizó análisis proximal a las carnes crudas y cocidas, se evaluó microbiológicamente a las crudas y sensorialmente las cocidas con 100 consumidores. En las carnes para hamburguesas a mayor adición de HST favoreció la retención de agua durante la cocción y se elevó el contenido de proteína, grasa y cenizas en las carnes crudas y cocidas (p < 0,05. El análisis microbiológico reveló inocuidad alimentaria en las carnes para hamburguesas crudas, encontrándose todos los valores por debajo de lo establecido en la norma venezolana COVENIN 2127-1998 para hamburguesa y otras normas de referencia. La blandura aumentó de manera proporcional al incremento porcentual en la inclusión de HST y las formulaciones con 0, 3 y 6 % de HST se diferenciaron significativamente (p < 0,05 de la formulación con 9 %. La apariencia de las carnes de hamburguesa agradó más en las formulaciones 6 y 9 %, la blandura en 9 %, y el sabor en el control (0 %, seguido de 3 %. Algunos consumidores hicieron asociaciones de sabor a carne de pollo, mariscos y hervidos de pollo.

  8. Evaluación del tiempo de evacuación gástrica de la cachama blanca Piaractus brachypomus (Cuvier, 1818, utilizando diferentes frecuencias de alimentación y ayuno

    Directory of Open Access Journals (Sweden)

    José Ader Gómez-Peñaranda

    2013-12-01

    Full Text Available Este estudio estima el tiempo de vaciado del estómago de la cachama blanca (Piaractus brachypomus en el día de comienzo regular de alimentación posterior a un periodo de ayuno. Para el efecto, se recolectaron muestras de contenido estomacal en periodos de dos horas después del suministro de alimento (9:30 y 15:30 h hasta el primer indicio de vaciado. Se utilizaron cachamas con un peso de 360 ± 12 g dispuestas en cuatro tratamientos: (1 T1 = alimentación a saciedad durante 5 días y ayuno de 2 días, (2 T2 = alimentación a saciedad durante 6 días y ayuno de 1 día, (3 T3 = alimentación a saciedad durante 7 días, y (4 TC = alimentación siguiendo las tablas recomendadas por el fabricante del alimento. El análisis de datos se realizó mediante ANOVA de medidas repetidas, empleando como factores el tratamiento y el tiempo de vaciado, siendo cada repetición la unidad experimental. Las cachamas del tratamiento T1 presentaron mayor cantidad de alimento en el estómago en los muestreos posteriores al suministro de la primera y segunda ración. A diferencia del tratamiento T1, en los demás las cachamas vaciaron su contenido en el estómago en el periodo comprendido entre la primera y la segunda ración de alimentación y en el periodo posterior a la segunda ración. Por tanto, cuando el contenido estomacal fue mayor, debido a un mayor consumo de alimento en la ración, como en el caso del tratamiento (T1, el tiempo necesario para vaciar el estómago de las cachamas se incrementó.

  9. BICULTIVO EN BIOFLOC DE CACHAMA BLANCA -Piaractus brachypomus- Y TILAPIA NILÓTICA -Oreochromis niloticus- ALIMENTADAS CON DIETAS DE ORIGEN VEGETAL

    Directory of Open Access Journals (Sweden)

    S. B. Brú-Cordero

    2017-01-01

    Full Text Available Se evaluó el desempeño productivo de cachama blanca y tilapia nilótica cultivadas en biofloc y alimentadas con dietas de origen vegetal. Se cultivaron 80 peces/m3 en proporción 1:1 (cachama : tilapia, con tres niveles de proteína bruta (PB: 16% (T16, 24% (T24 y 32% (T32, en tanques de 1.000 l, con aireación permanente durante 120 días. Se estimaron parámetros de crecimiento, rendimiento, calidad de agua, costos de producción y análisis proximal de los flóculos. El oxígeno disuelto se mantuvo con saturación por encima de 100% y los compuestos nitrogenados (NO2 = 0,4-0,5 mg/l, NO3 = 0,4-0,5 mg/l, NH3 = 0,2-0,3 mg/l, TAN = 2,2-2,4 mg/l no presentaron diferencias entre los tratamientos (P > 0,05. Los pesos finales de la cachama (173,5-196,2 g fueron entre dos y cuatro veces los obtenidos por la tilapia (43,0-87,9 g. El mejor rendimiento del bicultivo se obtuvo con la dieta T24 (11,4 ± 1,3 kg/m3, el cual también registró el menor FCA (0,9 ± 0,3. Producir un kilogramo de pescado costó entre COP $3.148 (T24 y COP $4.445 (T32; del cual el alimento representó entre 49,2% (T16 y 63,3% (T32 y la energía, entre 10,3% (T32 y 14,2% (T16 de los costos. El análisis proximal de los flóculos registró niveles de proteína bruta (29-36% PB adecuados para cachama y tilapia; pero con niveles bajos de lípidos (< 1,0%. El desempeño productivo y los costos de producción permiten sugerir la viabilidad que ofrece el sistema biofloc para la producción de carne de pescado con alimento de 24% PB de origen vegetal.

  10. Evaluación de la restricción alimenticia sobre el desempeño productivo y fisiológico en juveniles de cachama blanca, piaractus brachypomus, en condiciones de laboratorio

    OpenAIRE

    Rodríguez, L.; Landines, M. A.

    2011-01-01

    El objetivo general del trabajo fue evaluar el efecto de la restricción de alimento sobre el desempeño productivo y fisiológico de juveniles de cachama blanca y sobre su contenido muscular de proteína y energía. En cuanto al diseño experimental, este fue completamente al azar, con cuatro tratamientos y cuatro repeticiones, cada una con cuatro individuos. Se seleccionaron 64 individuos con 58,40 ± 6,56 g de peso (P) y 14,65 ± 0,75 cm de longitud total (LT), distribuidos aleatori...

  11. EVALUACIÓN DE LA RESTRICCIÓN ALIMENTICIA SOBRE EL DESEMPEÑO PRODUCTIVO Y FISIOLÓGICO EN JUVENILES DE CACHAMA BLANCA, Piaractus brachypomus, EN CONDICIONES DE LABORATORIO

    Directory of Open Access Journals (Sweden)

    L. Rodríguez

    2011-01-01

    muscular de proteína y energía. En cuanto al diseño experimental, este fue completamenteal azar, con cuatro tratamientos y cuatro repeticiones, cada una con cuatroindividuos. Se seleccionaron 64 individuos con 58,40 ± 6,56 g de peso (P y 14,65 ±0,75 cm de longitud total (LT, distribuidos aleatoriamente en 16 acuarios y sometidosdurante ocho semanas a los siguientes tratamientos: de control (T0: alimentación diaria;tratamiento 1 (T1: un día de ayuno y uno de alimentación; tratamiento 2 (T2:tres días de ayuno y dos días de alimentación, y tratamiento 3 (T3: dos días de ayunoy tres de alimentación. Se utilizó alimento de 35% de proteína, suministrado al 3%de la biomasa total dos veces al día. Al culminar el periodo experimental, los animalesexperimentales se anestesiaron y se les tomaron muestras de sangre para evaluar diferentesparámetros metabólicos y hormonales. Posteriormente, se sacrificaron, pesarony midieron; luego, se pesaron sus vísceras y una porción de músculo blanco se obtuvopara determinar el contenido de proteína y energía. Al final del ensayo, se calculó la sobrevivencia. Luego, de acuerdo con los resultados,se concluyó que no hubo diferencias significativas en la mayoría de los parámetrosanalizados, por lo que se infiere que los juveniles de cachama blanca son capaces deadaptarse metabólicamente a la carencia parcial de alimento y optimizar la respuesta en su desempeño.

  12. Dietary protein levels in Piaractus brachypomus submitted to extremely acidic or alkaline pH

    Directory of Open Access Journals (Sweden)

    Luciano de Oliveira Garcia

    2014-02-01

    Full Text Available The objective this study was to evaluate the effects of dietary protein levels in pirapitinga, Piaractus brachypomus, submited to extremely acidic or alkaline pH. Juveniles were fed for 20 days with three diets with different crude protein (CP levels (25.3, 32.4 and 40.0% and then separated in five groups (n=10, three replicates each which were kept in 60 L aquaria and exposed to pH 3.0, 3.5, 7.0, 10, or 10.5. Fish were removed from aquaria when they showed loss of swimming balance, and then blood was collected and plasma separated for measurement of Na+, Cl- and K+ levels. The increase of dietary protein levels (up to 40.0% CP provided some protection for pirapitinga at pH 3.5 or 10.0 because the time to lose equilibrium increased after acute exposure, but was not effective for compensating ion loss at very acidic (Na+ and Cl- and alkaline (Cl- pH.

  13. Crescimento de juvenis de Piaractus brachypomus alimentados com dietas contendo diferentes perfis de aminoácidos essenciais

    Directory of Open Access Journals (Sweden)

    Wálter Vásquez-Torres

    2013-08-01

    Full Text Available O objetivo deste trabalho foi determinar o efeito de dietas com diferentes perfis de aminoácidos essenciais (AAE sobre a eficiência de utilização de nutrientes e o crescimento de juvenis de pirapitinga (Piaractus brachypomus. Utilizaram-se caseína e gelatina como fontes de proteína, tendo-se formulado nove dietas com concentração de caseína entre 0 e 35%, com incrementos de 4,4% e concomitante diminuição da proporção de gelatina. Determinou-se o perfil de aminoácidos da caseína, da gelatina e de amostras de tecidos do corpo inteiro de juvenis de pirapitinga. Os níveis dietéticos de caseína apresentaram efeito quadrático positivo sobre as variáveis zootécnicas. O escore químico entre o perfil de aminoácidos essenciais das proteínas corpóreas e o perfil das dietas experimentais mostrou que, nas rações com 31,6 e 35% de caseína, o conteúdo de arginina torna-se limitante. O perfil de aminoácidos corporais da pirapitinga foi similar ao padrão de aminoácidos descrito para teleósteos. O perfil de aminoácidos obtido com a mistura de caseína e gelatina à proporção de 8:1 se aproxima do requerido para o crescimento de juvenis de Piaractus brachypomus.

  14. EFECTO DE LA RESTRICCIÓN ALIMENTICIA Y LA REALIMENTACIÓN SOBRE LA COMPOSICIÓN DEL MÚSCULO BLANCO DE Piaractus brachypomus

    Directory of Open Access Journals (Sweden)

    F. Y. Riaño

    2011-01-01

    Full Text Available Con el propósito de evaluar el efecto de la restricción alimenticia y la realimentación sobre la composición del músculo blanco de cachama blanca, se aplicaron dos protocolos de restricción alimenticia durante 84 días, cada uno dividido en un periodo de restricción alimenticia y un periodo de realimentación. En el primer protocolo, se aplicó una restricción alimenticia moderada (33,3%, y en el segundo, una restricción severa (50%; ambos grupos fueron comparados con un grupo control que recibió una ración alimenticia igual a la suministrada bajo condiciones de un cultivo comercial. Al finalizar el ensayo, ninguno de los tiempos de restricción alimenticia tuvo efectos significativos (p > 0,05 sobre el porcentaje de proteína del filete. Sin embargo, se observaron efectos significativos (p < 0,05 sobre los porcentajes de lípidos, cenizas y energía. Con respecto al porcentaje de cenizas musculares, se observó que la restricción alimenticia tendió a aumentar su valor, mientras que para el porcentaje de lípidos y los niveles de energía, se encontró el efecto contrario. No obstante, cuando los individuos finalizaron el periodo de realimentación, se observó un restablecimiento en los niveles de nutrientes comparados con los individuos no restringidos. En cuanto al perfil de ácidos grasos, el grupo control mostró con diferencias significativas (p < 0,05 mayor porcentaje de omega-3 (n-3. Estos resultados permiten concluir que los protocolos de alimentación aplicados estimularon, en Piaractus brachypomus, movilización de nutrientes musculares y su posterior restablecimiento, sin afectar la integridad del músculo blanco.

  15. Níveis de proteína na dieta de Piaractus brachypomus submetidos a pH extremamente ácidos ou alcalinos

    OpenAIRE

    Garcia, Luciano de Oliveira; Gutiérrez-Espinosa, Mariana; Wásquez-Torres, Walter; Baldisserotto, Bernardo

    2014-01-01

    The objective this study was to evaluate the effects of dietary protein levels in pirapitinga, Piaractus brachypomus, submited to extremely acidic or alkaline pH. Juveniles were fed for 20 days with three diets with different crude protein (CP) levels (25.3, 32.4 and 40.0%) and then separated in fi ve groups (n=10, three replicates each) which were kept in 60 L aquaria and exposed to pH 3.0, 3.5, 7.0, 10, or 10.5. Fish were removed from aquaria when they showed loss of sw...

  16. Physicochemical Evaluation of Cachama Fillets (Piaractus brachypomus Preserved with Propolis during Storage / Evaluación Fisicoquímica de Filetes de Cachama (Piaractus brachypomus Preservados con Propóleos durante el Almacenamiento

    Directory of Open Access Journals (Sweden)

    Héctor Suárez Mahecha

    2014-03-01

    Full Text Available The bioactive compounds that propolis containspresent diverse components that can diminish the deterioration of compounds such as fat and certain microorganisms that can affect fish fillets during refrigerated storage. The aim of this study was to evaluate the preserving capacity of ethanol extracts of propolis (EEP in cachama fish fillets (Piaractus brachypomus. The treatments carried out were: (1 ethyl alcohol (96% as the control; (2 0.8% EEP; (3 1.2% EEP; and (4 liquid smoke. Analyses were carried out for total volatile base nitrogen (TVBN, thiobarbituric acid reactive species-TBARS, pH and water loss for 0, 8, 16 and 24 days of storage at 4 ºC with vacuum packaging. The results presented the highest values of the TBARS and TVBNanalyses for the liquid smoke treatment and the lowest values for the EEP treatments, demonstrating a significant difference between the treatments (P<0.05; however, the best water retention capacity was seen in the fillets treated with liquid smoke. The results for pH did not present significant differences between the treatments (P>0.05 during the storage period. The results suggest that EEP can preserve physicochemical characteristics during the shelf life of refrigerated, vacuum packed cachama fillets. / Los compuestos bioactivos contenidos en propóleos presentan diversos componentes, que pueden disminuir el deterioro de compuestos como la grasa, y la cantidad de ciertos microorganismos, que pueden afectar filetes de pescado durante el almacenamiento bajo refrigeración. El objetivo de este trabajo fue evaluar la capacidad conservante de extractos etanólicos de propóleos (EEP sobre filetes del pescado cachama (Piaractus brachypomus. Los tratamientos realizados fueron: (1 alcohol etílico (96% como control; (2 EEP 0,8%; (3 EEP 1,2% y (4 humo líquido. Fueron realizados análisis para bases volátiles totales (BVTN, especies reactivas al ácido tiobarbitúrico-TBARS, pH y pérdida de agua

  17. Diet shift of Red Belly Pacu Piaractus brachypomus (Cuvier, 1818 (Characiformes: Serrasalmidae, a Neotropical fish, in the Sepik-Ramu River Basin, Papua New Guinea

    Directory of Open Access Journals (Sweden)

    Sandra Bibiana Correa

    Full Text Available Introduction of fish species is a globally widespread practice that causes losses of native species and homogenization of diversity within and across continents. Diet assessments are important tools to depict the ecological function of species introduced into novel ecosystem and possible direct and indirect ecological effects. In this study, we compare the diet of Piaractus brachypomus, a mainly frugivorous Neotropical fish, introduced into the Sepik-Ramu River Basin (Papua New Guinea nearly two decades ago, to that of similar size individuals from Neotropical populations in the Amazon and Orinoco River basins (South America. In contrast to native populations that feed mainly on terrestrial plants and invertebrates, the diet of introduced P. brachypomus is mainly composed of fish remains and aquatic plants, while terrestrial plants are frequently consumed but in relatively smaller amounts. These findings show that P. brachypomus has an inherently plastic diet that can be adjusted when displaced to a novel geographic area. While trophic plasticity increases the likelihood of a species to establish breeding populations after its introduction, it also reduces our ability to predict negative effects on native species.

  18. Out-of-season sperm cryopreserved in different media of the Amazonian freshwater fish pirapitinga (Piaractus brachypomus).

    Science.gov (United States)

    Nascimento, A F; Maria, A N; Pessoa, N O; Carvalho, M A M; Viveiros, A T M

    2010-04-01

    The pirapitinga (Piaractus brachypomus) is a freshwater fish that inhabits the Amazon and Orinoco River basins. The use of cryopreserved sperm has been considered to facilitate procedures during the artificial reproduction. The aim of the present study was to develop a freezing protocol for pirapitinga sperm collected outside the spawning season. Sperm samples were diluted in four freezing media prepared by a combination of two extenders (glucose and BTS-Beltsville Thawing Solution) and two cryoprotectant agents (DMSO and methylglycol) loaded into 0.5-mL straws, frozen in a nitrogen-vapor shipping dewar (dry-shipper) and stored in liquid nitrogen at -196 degrees C. Post-thaw sperm motility was evaluated both subjectively using a light microscope and by a computer-assisted sperm analyzer (CASA). Curvilinear, average path and straight-line velocities were also determined. There were no differences (P>0.05) in post-thaw sperm motility between evaluations performed subjectively and using the CASA. Sperm samples cryopreserved in glucose-methylglycol yielded the greatest post-thaw sperm motility (81%) and fastest sperm velocities when compared to the samples frozen in the other three media (P<0.05). Out-of-season sperm cryopreserved in glucose and methylglycol under the conditions described above is of high quality and can therefore be used to facilitate artificial reproduction procedures, as only females will need handling for hormonal induction and gamete collection during the spawning season. Although the CASA system provides precise data on sperm motility, the subjective evaluation is practical and can be conducted by well-trained personnel at commercial fish farms as an acceptable evaluation of sperm quality. Copyright 2009 Elsevier B.V. All rights reserved.

  19. Delimiting Evolutionarily Significant Units of the Fish, Piaractus brachypomus (Characiformes: Serrasalmidae), from the Orinoco and Amazon River Basins with Insight on Routes of Historical Connectivity.

    Science.gov (United States)

    Escobar, Maria Doris; Andrade-López, Juana; Farias, Izeni P; Hrbek, Tomas

    2015-01-01

    The freshwater fish Piaractus brachypomus is an economically important for human consumption both in commercial fisheries and aquaculture in all South American countries where it occurs. In recent years the species has decreased in abundance due to heavy fishing pressure. The species occurs in the Amazon and Orinoco basins, but lack of meristic differences between fishes from the 2 basins, and extensive migration associated with reproduction, have resulted in P. brachypomus being considered a single panmictic species. Analysis of 7 nuclear microsatellites, mitochondrial DNA sequences (D-loop and COI), and body shape variables demonstrated that each river basin is populated by a distinct evolutionarily significant unit (ESU); the 2 groups had an average COI divergence of 3.5% and differed in body depth and relative head length. Historical connection between the 2 basins most probably occurred via the Rupununi portal rather than via the Casiquiare canal. The 2 ESUs will require independent fishery management, and translocation of fisheries stocks between basins should be avoided to prevent loss of local adaptations or extinction associated with outbreeding depression. Introductions of fishes from the Orinoco basin into the Putumayo River basin, an Amazon basin drainage, and evidence of hybridization between the 2 ESUs have already been detected. © The American Genetic Association 2015. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  20. Estandarización de un proceso de extracción de colágeno a partir de los residuos de fileteo de tilapia (Oreochromis sp) y cachama (Piaractus brachypomus) / Standardization of a process for extracting collagen from filleting waste from tilapia (Oreochromis sp) and cachama (Piaractus brachypomus)

    OpenAIRE

    Serrano Gaona, Jenifer Carolina

    2011-01-01

    Se estandarizó un proceso de extracción y purificación de colágeno ácido soluble a partir de pieles de tilapia (Oreochromis sp) y de cachama (Piaractus brachypomus) utilizando análisis estadísticos. Los resultados indicaron que el rendimiento de colágeno ácido soluble fue de 33,3% en base seca. El patrón de alto peso molecular utilizado para SDS – PAGE reveló que el colágeno obtenido de pieles de tilapia o de pieles de cachama es colágeno tipo I. La temperatura de desnaturalización (Td) del c...

  1. Parásitos de alevinos de gamitana (Colossoma macropomum y paco (Piaractus brachypomus cultivados en el C.I. Quistococha, Loreto, Perú

    Directory of Open Access Journals (Sweden)

    Fernando Alcántara Bocanegra

    2015-06-01

    Full Text Available En acuicultura, los peces son susceptibles al ataque de virus, bacterias, hongos y ectoparásitos. Estos organismos se tornan en un serio problema cuando los peces se encuentran con bajas defensas naturales, se crían en altas densidades y/o se altera drásticamente la calidad de agua. El objetivo del presente estudio fue identificar la fauna de parásitos presentes en alevinos de paco (Piaractus brachypomus y gamitana (Colossoma macropomum provenientes de estanques del Centro de Investigación Quistococha del IIAP. Un total de 30 ejemplares de cada especie fueron examinados a través de la preparación de frotis fresco de branquias, piel, aletas y tubo digestivo. Entre las dos especies estudiadas, gamitana demostró una mayor prevalencia de infestación, mayor intensidad de parásitos y mayor índice de infestación parasitaria. Los alevinos de paco mostraron una mayor resistencia a la propagación y al ataque de parásitos. Se identificaron monogeneos de las familias Dactylogyridae y Gyrodactylidae, solo en gamitana, mientras que el protozoo ciliado Trichodina se halló exclusivamente en paco. Los parásitos identificados no causaron ninguna mortalidad en los peces.

  2. Validación del Protocolo de Reproducción de Colossoma macropomum, Piaractus brachypomus y Prochilodus nigricans en Condiciones Controladas

    Directory of Open Access Journals (Sweden)

    Lorgio Verdi Olivares

    2014-06-01

    Full Text Available Protocolos aplicados a las diferentes etapas de la reproducción  inducida: tratamiento hormonal, incubación, manejo de larvas, y manejo de alevines en los peces de consumo humano Colossoma macropomum (gamitana, Piaractus brachypomus (paco y Prochilodus nigricans (boquichico fueron evaluados en el marco del proyecto UNAP “Cátedra CONCYTEC en Acuicultura Tropical” con el propósito de establecer los adecuados procedimientos en la búsqueda de una óptima productividad acuícola y una mejor rentabilidad económica en Loreto. Con este objetivo se utilizaron como inductores: para gamitana, Pituitaria de Carpa con dosis total de 6,0 mg/kg en hembras y 2,0 mg/kg en machos; Para machos y hembras de paco, Conceptal en dosis total de 2,6 ml/kg en hembras y 1,0 ml/kg en machos; y para boquichico, Pituitaria de Carpa con dosis total de 4,0 mg/kg en hembras y 2,0 mg/kg en machos. El desove se produjo en 11±2 horas; la eclosión ocurre después de 22 horas a partir de la fecundación, con tasas promedios superiores al 70% y tasas de sobrevivencia, aún cundo por debajo del 50%, garantiza una alta producción de alevines.

  3. Validación del Protocolo de Reproducción de Colossoma macropomum, Piaractus brachypomus y Prochilodus nigricans en Condiciones Controladas

    Directory of Open Access Journals (Sweden)

    Lorgio Verdi-Olivares

    2014-07-01

    Full Text Available Protocolos aplicados a las diferentes etapas de la reproducción  inducida: tratamiento hormonal, incubación, manejo de larvas, y manejo de alevines en los peces de consumo humano Colossoma macropomum (gamitana, Piaractus brachypomus (paco y Prochilodus nigricans (boquichico fueron evaluados en el marco del proyecto UNAP “Cátedra CONCYTEC en Acuicultura Tropical” con el propósito de establecer los adecuados procedimientos en la búsqueda de una óptima productividad acuícola y una mejor rentabilidad económica en Loreto. Con este objetivo se utilizaron como inductores: para gamitana, Pituitaria de Carpa con dosis total de 6,0 mg/kg en hembras y 2,0 mg/kg en machos; Para machos y hembras de paco, Conceptal en dosis total de 2,6 ml/kg en hembras y 1,0 ml/kg en machos; y para boquichico, Pituitaria de Carpa con dosis total de 4,0 mg/kg en hembras y 2,0 mg/kg en machos. El desove se produjo en 11±2 horas; la eclosión ocurre después de 22 horas a partir de la fecundación, con  tasas promedios superiores al 70% y tasas de sobrevivencia, aún cundo por debajo del 50%, garantiza una alta producción de alevines.

  4. Estudos para Composição de uma Dieta Referência Semipurificada para Avaliação de Exigências Nutricionais em Juvenis de Pirapitinga, Piaractus brachypomus (Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Vásquez-Torres Wálter

    2002-01-01

    Full Text Available Foram realizados dois experimentos com o objetivo de definir uma dieta referência para estudos de exigências nutricionais em Piaractus brachypomus. No primeiro experimento, foram testadas quatro dietas com ingredientes semipurificados (H-440 com 47% PB, C-102 com 41% PB, NRC com 37% PB e IALL-1 com 32% de PB e uma dieta controle (32% de PB com ingredientes comuns. No segundo experimento, foi usada a dieta IALL-1, como base para a formulação de três dietas experimentais. A dieta 2 foi suplementada com vitamina C e uma pré-mistura de macrominerais, enquanto na dieta 3 o óleo vegetal foi substituído por óleo de peixe. O ganho de peso foi usado como critério básico para medir os efeitos das dietas, sendo também considerados consumo de alimento, taxa específica de crescimento (SGR, conversão alimentar aparente (FCR, eficiência de utilização da proteína (PER e retenção de proteína (%PPV e de energia (%RE. Entre as dietas semipurificadas, o melhor desempenho de crescimento e de utilização dos nutrientes foi observado para as dietas NRC e IALL-1, que não diferiram entre si. No segundo experimento, o grupo de peixes alimentados com a dieta 2 apresentou crescimento 42% maior que o observado com as dietas sem suplementação. As outras variáveis analisadas, FCR, SGR, PER e %PPV, também foram significativamente melhoradas. Os resultados em conjunto indicam que a dieta IALL-1 suplementada com macrominerais e vitamina C pode ser considerada adequada como dieta referência semipurificada para estudos de nutrição de Piaractus brachypomus.

  5. Aeromonas hydrophila Extracelullar Products Extraction and its Effects on Tilapia Roja (Oreochromis spp. and Cachama Blanca (Piaractus brachypomus

    Directory of Open Access Journals (Sweden)

    M. Rodríguez

    2005-07-01

    of 128 UH/μL and a proteolitic activity of 38.4 UP/μL and produced high fish mortality and severe multiorganic lesions. Electrophoresis revealed bands from 50 to 52 kDa y 63 to 68 kDa, that could correspond to the b hemolisina or a hemolisina y other from 30 to 36 kDa that could correspond to the thermostable metalloprotease.

  6. Cultivo de cachama blanca en altas densidades y en dos sistemas cerrados

    OpenAIRE

    Poleo, Germán; Aranbarrio, José Vicente; Mendoza, Lismen; Romero, Oneida

    2011-01-01

    El objetivo de este trabajo fue evaluar la tolerancia de la cachama blanca, Piaractus brachypomus, a cultivos en altas densidades en sistemas cerrados. Novecientos alevines de 44,3±26 g de peso, se distribuyeron en seis tanques de concreto, con 4,8 m³ de agua. Tres tanques presentaron cero recambio de agua (SCR), y en otros tres, el agua se hizo circular a través de un bioclarificador (SRA). Ambos tratamientos presentaron fuerte aireación para mantener los sólidos en suspensión y suministrar ...

  7. EVALUACIÓN DE NUEVA TECNOLOGÍA PARA MITIGAR LAS ESPINAS INTRAMUSCULARES EN FILETES DE CACHAMA Piaractus brachypomus (Pisces: Characidae EVALUATION OF NEW TECHNOLOGY TO MITIGATE INTRAMUSCULAR THORNS IN CACHAMA FILLETS

    Directory of Open Access Journals (Sweden)

    Héctor Suárez Mahecha

    2009-06-01

    Full Text Available La presencia de espinas intramusculares en filetes de cachama dificulta la comercializacion y demanda por parte de los consumidores. Hasta el momento no existen tecnologías que permitan ofrecer filetes de cachama que garanticen condiciones de seguridad frente a las espinas. El objetivo del presente trabajo fue evaluar una nueva tecnología para mitigar la presencia de espinas en filetes de cachama Piaractus brachypomus empacados al vacío y almacenados durante 30 días a 3±0,5 °C. A filetes en presentación lateral interna fueron realizados cortes profundos, paralelos y perpendiculares al eje longitudinal, a una distancia de 3 mm entre cada corte, en sentido dorso-ventral. Fueron realizados análisis microbiológico, fisicoquímico y sensorial. El análisis microbiológico muestra condiciones aceptables para el final del periodo de almacenamiento. Los valores obtenidos para este periodo, fueron de log UFC/g 7,07; 4,7 y 1100 NMP, 18 NMP para organismos psicrotrofilos, mesófilos, coliformes totales y coliformes fecales, respectivamente. No fue determinada presencia de Salmonella ni de organismos sulfito reductores. El análisis fisicoquímico mostró valores de 39,36 para BVT-N; 6,22 pH; 3,3% de pérdida de humedad 1,52; ácido tiobarbitúrico mg MA/kg. El efecto del sajado no incrementó los valores de oxidación de ácidos grasos, ni aumentó las BVT que pudiesen indicar degradación de la proteína. En el análisis sensorial los filetes sometidos a cocción fueron rechazados solamente a partir del día 25 del periodo de almacenamiento, para los atributos aroma y sabor. Durante la evaluación los panelistas no encontraron presencia de espinas, mostrando que la temperatura de cocción utilizada y los cortes en las espinas, permiten degradar la espina intramuscular evitando que sea detectada.The presence of pin bones in cachama fillets makes marketing and demand difficult by the consumers. So far, there are no technologies to provide cachama

  8. Purificación rápida de inmunoglobulina M a partir de suero de cachama blanca (piaractus brachypomus) y preparación de antisuero policlonal en conejo

    OpenAIRE

    Montoya, Francy J.; Almansa, Jorge E.; Parada, Sandra; Eslava, Pedro René; Arias, Alfredo; Toro, Rubén Darío; Rojas, Joyce Andrea

    2007-01-01

    A pesar de la reconocida rusticidad de la cachama, la tendencia creciente hacia la intensificación de los sistemas de producción de la especie comienzan a favorecer el aumento de problemas sanitarios, los cuales deberán ser caracterizados a fin de poder establecer métodos de diagnóstico y planes de prevención racionales. Dado que el conocimiento ictiopatológico de especies nativas es incipiente (entre otras cosas porque la disponibilidad de información sobre aspectos básicos de histología, em...

  9. Cultivo de cachama blanca en altas densidades y en dos sistemas cerrados

    Directory of Open Access Journals (Sweden)

    Germán Poleo

    2011-04-01

    Full Text Available El objetivo de este trabajo fue evaluar la tolerancia de la cachama blanca, Piaractus brachypomus, a cultivos en altas densidades en sistemas cerrados. Novecientos alevines de 44,3±26 g de peso, se distribuyeron en seis tanques de concreto, con 4,8 m³ de agua. Tres tanques presentaron cero recambio de agua (SCR, y en otros tres, el agua se hizo circular a través de un bioclarificador (SRA. Ambos tratamientos presentaron fuerte aireación para mantener los sólidos en suspensión y suministrar aire. Los peces se alimentaron a saciedad con pienso comercial por 192 días. Los parámetros de calidad de agua como: oxígeno disuelto, amonio total, nitritos, nitratos, alcalinidad, dureza, temperatura y pH, se midieron semanalmente. Los peces en el SCR crecieron a una tasa de 2,34±0,05 g por día, y tuvieron conversión alimenticia de 1,5±0,06, densidad final de 12,96±0,53 kg m-3, y peso final de 449,5±99 g. En el SRA, los peces crecieron 2,33±0,03 g por día, con conversión alimenticia de 1,6±0,07, densidad final de 12,13±1,12 kg m-3, y peso final de 446,5±10 g. La cachama blanca puede ser cultivada en sistemas cerrados con cero recambio de agua en altas densidades.

  10. [RNA/DNA ratio as an index of physiological condition of Colossoma macropomum and Piaractus branchypomus (Pisces: Characiformes) during embryonic development].

    Science.gov (United States)

    Gil, Humberto; Chung, Kyung S; Lemus, Mairin; Altuve, Douglas

    2003-06-01

    We evaluated RNA/DNA ratio as an index of physiological condition during larval development of a hybrid between the fishes Colossoma macropomum (cachama) and Piaractus brachypomus (morocoto). The samples were obtained by induced reproductive technology and the eggs were maintained in acrylic conical incubator with a continuous waterflow. Embryonic development, from egg fertilization to cell division and hatch out, took 12 hours 20 minutes at 29.5 degrees C, dissolved oxygen contents of 6.0 ppm and pH 7.5. Nucleic acids quantification was determined by fluorometry with ethidium bromide and Hoechst 33258 dyes. We observed significant changes of RNA/DNA ratios during all stages of the embryonic larval development. Therefore, RNA/DNA relation is an useful technique to evaluate physiological condition in short period and could be utilized as nutritional condition and/or instantaneous growth for routine check to verify the health status in early life of cultivated species.

  11. Chromosomal Mapping of Repetitive Sequences (Rex3, Rex6, and rDNA Genes) in Hybrids Between Colossoma macropomum (Cuvier, 1818) and Piaractus mesopotamicus (Holmberg, 1887).

    Science.gov (United States)

    Ribeiro, Leila Braga; Moraes Neto, Americo; Artoni, Roberto Ferreira; Matoso, Daniele Aparecida; Feldberg, Eliana

    2017-04-01

    Some species of Characiformes are known for their high economic value, such as Colossoma macropomum and Piaractus mesopotamicus, and are used in aquaculture programs to generate hybrid tambacu (interbreeding of C. macropomum females and P. mesopotamicus males). The present work aimed to investigate the location of the Rex3 and Rex6 transposable elements in the hybrid and in the species, in addition to checking the genomic organization of the 18S and 5S rDNA in tambacu. The diploid number found for the hybrid was equal to 54 chromosomes, with heterochromatic blocks distributed mainly in the centromeric portions. The chromosomal location of the mobile elements Rex3 and Rex6 in C. macropomum, P. mesopotamicus, and in the hybrid between these species enabled knowledge expansion and the generation of data on such mobile elements. In addition, the location of such elements is not related to the distribution of ribosomal DNA sites. The mapping of the 18S rDNA was shown to be effective in cytogenetic identification of the hybrid tambacu, allowing for differentiation from the parent species and from the hybrid between C. macropomum and the other species from Piaractus (P. brachypomus).

  12. Influence of diet on the survival of Fingerlings Colossoma macropomum (♀ x Piaractus brachypomus (♂ and their repercussion on water quality.

    Directory of Open Access Journals (Sweden)

    Ascanio Rodríguez, A.Y.

    2016-01-01

    Full Text Available Appropriate feeding practices in pisciculture consist in adjusting food ration according to the requirements and phase of growth of the species to cultivate, avoiding the loss of food and overfeeding. This affects the survival of the fish, the physical-chemical characteristics of the water and increases production costs. With the objective to evaluate the influence of the diets in the survival of cachamoto fingerlings and their repercussion in the water quality, an assay was performed in the Laboratory of Agricultural Zoology, in the University of East Monagas Nucleus, Maturín, Venezuela, using 96 fingerlings with initial weight of 2.30 g, distributed in 12 clear glass aquariums, with useful capacity of 40 L, with density of 8 fish/aquarium, providing four diets with two protein levels 25 % and 45 %, respectively, with and without phytoplankton. The feeding frequency was twice daily, considering 10 % of the biomass adjusted to 7 %. The results showed less mortality in diet 2 with 25 % of protein plus phytoplankton (survival 100 % and diet 1 with 25 % of protein (survival 75 %. The highest mortality rate registered was in diet 4 of 45 % of protein plus phytoplankton (survival 25 % and diet 3 of 45 % of protein (survival 29 %. The parameters of the water: temperature (29.25 ºC, total dissolved solids (0.23 mg L-1, electrical conductivity (0.47 μS cm-1 and pH (6.44 did not affect the survival or water quality, staying within the acceptable limits for the species, but the nitrites (2.76 mg L-1 and nitrates (33.67 mg L-1 influenced in these two aspects. The diet with 25 % of protein plus phytoplankton registered greater survival and maintained the quality of the water in the cultures of cachamoto fingerlings.

  13. Natural Analog Studies at Pena Blanca, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    A.M. Simmons

    2005-07-11

    The significance of the Pena Blanca uranium deposits in the State of Chihuahua, Mexico as potential natural analogs for a nuclear waste repository in unsaturated welded tuff was first recognized in the 1980s. In the 1970s, the Pena Blanca region was a major target of uranium exploration and exploitation by the Mexican government. Since then the Nopal I uranium deposit has been studied extensively by researchers in the U.S., Mexico, and Europe. The Nopal I deposit represents an environment similar to that of the proposed high-level radioactive waste repository at Yucca Mountain in many ways. Both are located in semi-arid regions. Both are located in Tertiary rhyolitic tuffs overlying carbonate rocks that have been subjected to basin and range-style tectonic deformation. Both are located in a chemically oxidizing, unsaturated zone 200 m or more above the water table. The alteration of uraninite to secondary minerals at Nopal I may be similar to the alteration of uranium fuel rods in this type of setting. Investigations at Nopal I and in the surrounding Sierra Pena Blanca have included detailed outcrop mapping, hydrologic and isotopic studies of flow and transport, studies of mineral alteration, modeling, and performance assessment.

  14. Fósforo na alimentação de pacu (Piaractus mesopotamicus Phosphorus in feed for pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Arcangelo Augusto Signor

    2011-12-01

    Full Text Available Objetivou-se avaliar o uso de fósforo na dieta de juvenis de pacu (Piaractus mesopotamicus sobre a qualidade da água, o desempenho zootécnico, o rendimento corporal e a composição química da carcaça. Foram utilizados 100 juvenis com peso médio inicial de 25,9±1,32 g, distribuídos em delineamento inteiramente ao acaso, em 20 tanques de fibra de vidro, com cinco tratamentos e quatro repetições. Os peixes foram alimentados quatro vezes ao dia, às 8; 11; 14 e 17 h, com dietas extrusadas contendo 0,40; 0,55; 0,70; 0,85 e 1,0% de fósforo total. Não foram observadas diferenças nos parâmetros de qualidade de água, com exceção da concentração de ortofosfato na água, que apresentou aumento linear. Os parâmetros de desempenho zootécnico, rendimento corporal e composição química da carcaça não diferiram entre os níveis de suplementação de fósforo na dieta. A utilização de 0,40% de fósforo total atende às exigências de fósforo de juvenis de pacu (Piaractus mesopotamicus, além de disponibilizar menor concentração de ortofosfato da água.The objective of the present research was to evaluate phosphorus in diet for pacu (Piaractus mesopotamicus juveniles on water quality, livestock performance, body yield and carcass chemical composition. A total of 100 juveniles, 25.9±1.32 g average weight were randomly assigned into 20 fiberglass tanks, with five treatments and four replications. The fish were fed four times a day (8 and 11 a.m.; 2 and 5 p.m., with extruded diets containing 0.40; 0.55; 0.70; 0.85 and 1.0 % total phosphorus. No differences were observed in water quality parameters, except for the concentration of orthophosphate in water, which presented linear increase. The parameters livestock performance, body yield and carcass chemical composition showed no differences for the levels of supplementation of phosphorus in diet. The use of 0.40% total phosphorus meets the requirements of phosphorus for pacu (Piaractus

  15. La España de Rosas Blancas = The Spain of Rosas Blancas

    Directory of Open Access Journals (Sweden)

    Óscar Gual Boronat

    2015-06-01

    Full Text Available Mediante la lectura del cuaderno femenino español Rosas blancas, publicado por la editorial Toray entre 1958 y 1965, tratamos de estudiar la capacidad del cómic para reflejar el papel de la mujer durante una de las etapas clave de la dictadura franquista. Tras trazar un recorrido por los tebeos sentimentales de la década de 1940 (Azucena y las primeras revistas modernas para niñas (Florita y Sissi, analizaremos el contenido de dicha publicación. En ese análisis percibiremos cómo Rosas blancas prolongará determinados mitos de aquellas historietas al tiempo que introducirá nuevas perspectivas en consonancia con lo que estaba sucediendo en la sociedad española.Through the reading of the Spanish female comic-book Rosas blancas, published by Editorial Toray between 1958 and 1965, we try to explore the ability of comics to reflect the role of women during the key stages of the Franco dictatorship. After a study of the sentimental comics of the 1940s (Azucena and the first modern magazines for girls (Florita and Sissi, we analyse the content of this publication. In this analysis we perceive how Rosas blancas extend certain myths while those cartoons introduce new perspectives in line with what was happening in the Spanish society.

  16. Neumopericardio debido a herida por arma blanca

    Directory of Open Access Journals (Sweden)

    Samuel I. Merino Barrera

    2015-10-01

    Full Text Available Hombre de 24 años de edad que ingresó en el hospital debido a una herida por arma blanca penetrante en el hemitórax derecho. La herida, de 3 cm a nivel de la piel, se localizaba a nivel del segundo espacio intercostal derecho y la radiografía de tórax demostró un neumotórax del mismo lado y una colección radiotransparente, por debajo del pericardio parietal, desde el origen de los grandes vasos hasta la porción apical del ventrículo izquierdo.

  17. Biological indicators of stress in pacu (Piaractus mesopotamicus after capture

    Directory of Open Access Journals (Sweden)

    JS. Abreu

    Full Text Available The effects of capture (chasing, netting and air exposure on cortisol, glucose, chloride, sodium, potassium and calcium concentrations, osmolality, hematocrit, hemoglobin concentration, red blood cells count (RBC and mean corpuscular volume (MCV were investigated in pacu (Piaractus mesopotamicus. A total of 132 fish (49.7 ± 11.7 g were subjected to capture and 3 minutes air exposure and capture and 5 minutes air exposure. Nine fish at each treatment were sampled at 5, 15, 30, 60 minutes and 24 hours after the procedure. Nine undisturbed fish were sacrificed before the handling and used as controls. Capture resulted in a rise in blood cortisol and glucose 30 and 5 minutes, respectively, after both air exposures. Both indicators returned to resting levels 24 hours after capture. In both fish groups, plasma chloride decreased 60 minutes after capture, not recovering the resting levels within 24 hours after, and serum sodium rose at 15 and 30 minutes and recovered the resting levels 24 hours later. There were no significant changes neither in potassium, calcium and osmolality nor in hematocrit, hemoglobin, RBC and MCV as a consequence of capture. The sequential stressors imposed to pacu during capture activated the brain-pituitary-interrenal axis (cortisol and glucose responses but the activation of the brain-sympathetic-chromaffin cell axis was apparently moderate (ionic and hematological responses.

  18. Paraoxonase activity in liver of Pacu, Piaractus mesopotamicus Holmberg (Characidae

    Directory of Open Access Journals (Sweden)

    Vera Lucia F. Cunha Bastos

    1998-01-01

    Full Text Available Enzymatic production of p-nitrophenol in liver of Piaractus mesopotamicus Holmberg, 1887 was consistently assayed at pH 8.5 using 7.5 mM paraoxon as substrate. This pacu liver paraoxonase activity was activated by NaCl. Apparent values of K M were 2.42 x 10-3 M in the presence of 0.5 M NaCl and 8.99 x 10-3 M without NaCl. Apparent maximum velocity values calculated in the absence and presence of 0.5 M NaCl were 1.09 x 10-3 µmoles/min/mg of proteins and 1.29 x 100-3 µmoles/min/mg of proteins, respectively. These Vmax values are fifty-fold the value described for trout (Salmo trutta Linnaeus, 1758 liver paraoxonase. Paraoxonase activity of pacu liver homogenates was recovered as much in cytosolic as in particulate cellular subtractions, but the particulate subtractions showed higher specific activities. The data presented here indicate that hepatic hydrolysis of organophosphorous pesticides may not be an important detoxification process in pacu.

  19. Processed soybean in diets for pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Marcia Regina Stech

    2015-02-01

    Full Text Available Changes in development and in physiological parameters of fingerlings of the pacu (Piaractus mesopotamicus fed on diets with high levels of integral crude, extruded, toasted soybean and soybean meal were assessed. The products were evaluated in practical diets for pacu, initially weighing 70 ± 2.19 g, during 82 days. Nine treatments were studied in a 2 × 4 + 1 factorial scheme which corresponded to two fish meal protein replacement levels (50 and 100% and four soybean products, plus control (100% of fish meal - FM. Development, organosomatic indexes and physiological parameters were evaluated. No differences were reported with regard to weight gain, food intake, food conversion, protein efficiency ratio and specific growth rate. A significant interaction was registered for plasma protein between the evaluated ingredients and replacement percentage of fish meal protein. Results showed that the ingredients assessed did not affect the development of the pacu when compared to fish fed on control diet. Protein retention was favored when toasted soybean and when 50% of the diet’s protein fraction from fish meal were employed.

  20. Physiological responses of fish, Piaractus mesopotamicus, to infection with the freshwater fish louse, Dolops carvalhoi. Abstract

    NARCIS (Netherlands)

    Castro, F.J.; Wendelaar Bonga, S.E.; Fernandes, N.N.

    2007-01-01

    The freshwater fish louse Dolops carvalhoi, is an ectoparasite of pacu, Piaractus mesopotamicus, that causes severe damage to its hosts. The aim of this study was to investigate the physiological responses of pacu to the stress of D. carvalhoi infection. After acclimation at the laboratory

  1. Cordillera Blanca: glaciares en la historia

    Directory of Open Access Journals (Sweden)

    1995-01-01

    Full Text Available CORDILLERE BLANCHE - DES GLACIERS DANS L’HISTOIRE. La plus vaste couverture glaciaire de l’entre-tropiques n’apparaît comme un objet d’études que très tard, à la fin du XIXème siècle et, surtout grâce aux expéditions austro-allemandes, à partir des années 1930-1940. Le développement de l’alpinisme et un grand nombre de catastrophes meurtrières associées à la dynamique de ces glaciers (rupture de lacs de barrage morainique, avalanches ont attiré l’attention sur eux et suscité des recherches glaciologiques. En 1980, ils comptent parmi les mieux surveillés des glaciers tropicaux, d’abord grâce à un programme d’étude développé par les Péruviens eux-mêmes. à un moment où le réchauffement global fait craindre un recul très important de la glaciation dans la zone tropicale, les glaciers de la Cordillère Blanche deviennent d’excellents indicateurs de l’évolution climatique en cours et la ressource en eau qui leur est associée constitue à la fois un sujet d’étude et un enjeu économique de haute importance. La más vasta cobertura glaciar situada entre los trópicos aparece como objeto de estudio relativamente tarde, a fines del siglo XIX, sobre todo gracias a las expediciones austro alemanas a partir de los años 1930-1940. El desarrollo del alpinismo y un gran número de catástrofes mortales asociadas a la dinámica de estos glaciares (rotura de lagunas de represa morrénica, avalanchas atrajeron la atención y suscitaron investigaciones glaciológicas. En 1980, se encuentran entre los mejor monitoreados de los glaciares tropicales, primero, gracias a un programa de estudio desarrollado por los peruanos. En un momento en que el recalentamiento global hace temer un retroceso muy importante de la glaciación en la zona tropical, los glaciares de la Cordillera Blanca se convierten en excelentes indicadores de la evolución climática en curso y el recurso hídrico que se les asocia constituye a la vez un tema

  2. Phenotypic plasticity associated to environmental hypoxia in the neotropical serrasalmid Piaractus mesopotamicus (Holmberg, 1887) (Characiformes: Serrasalmidae)

    OpenAIRE

    Fernández-Osuna, María Alejandra; Scarabotti, Pablo Augusto

    2016-01-01

    ABSTRACT Many South American characid fishes develop reversible dermal protuberances in the jaws to optimize aquatic surface respiration (ASR) during hypoxia. To date, basic aspects of this adaptation remain unknown, mainly due to the scarcity of experimental studies. In laboratory experiments, we determined time necessary for the complete formation and reversion of these structures in Piaractus mesopotamicus , and studied comparatively behavioral, morphological, and respiratory responses alo...

  3. Antibiotic resistence of Aeromonas hydrophila isolated from Piaractus mesopotamicus (Holmberg, 1887) and Oreochromis niloticus (Linnaeus, 1758)

    OpenAIRE

    Belém-Costa,Andréa; Cyrino,José Eurico Possebon

    2006-01-01

    One of the most important problems involving treatments with antibiotics against Aeromonas hydrophila isolated from fishes is that antibiotic resistance develops readily. The antimicrobial activity of chemotherapeutants in isolates from pacu Piaractus mesopotamicus (Holmberg, 1887) and tilapia Oreochromis niloticus (Linnaeus, 1758) was tested by the Kirby-Bauer disk method, over Mueller-Hinton surface agar previously inoculated with 100 µL of bacterial suspensions. After regular incubation, i...

  4. Biochemical parameters for Piaractus mesopotamicus, Colossoma macropomum (Characidae) and hybrid tambacu (P. mesopotamicus X C. macropomum).

    OpenAIRE

    DIAS, M. T.; MORAES, F. R.

    2011-01-01

    A study for investigating the values of plasma glucose,serum total protein and serum ions (calcium, potassium, magnesium,sodium and chloride) was carried out in young Colossomomamacropomum Cuvier, 1818, Piaractus mesopotamicus Holmberg,1887 and the hybrid tambacu (P. mesopotamicus x C. macropomum),kept in intensive system. Glucose concentrations were higher intambacu than in P. mesopotamicus and C. macropomum. Totalprotein levels were higher in P. mesopotamicus than both C.macropomum and tamb...

  5. THE PENA BLANCA NATURAL ANALOGUE PERFORMANCE ASSESSMENT MODEL

    International Nuclear Information System (INIS)

    G.J. Saulnier Jr; W. Statham

    2006-01-01

    The Nopal I uranium mine in the Sierra Pena Blanca, Chihuahua, Mexico serves as a natural analogue to the Yucca Mountain repository. The Pena Blanca Natural Analogue Performance Assessment Model simulates the mobilization and transport of radionuclides that are released from the mine and transported to the saturated zone. the Pena Blanca Natural Analogue Model uses probabilistic simulations of hydrogeologic processes that are analogous to the processes that occur at the Yucca Mountain site. The Nopal I uranium deposit lies in fractured, welded, and altered rhyolitic ash flow tuffs that overlie carbonate rocks, a setting analogous to the geologic formations at the Yucca Mountain site. The Nopal I mine site has the following characteristics as compared to the Yucca Mountain repository site. (1) Analogous source: UO 2 uranium ore deposit = spent nuclear fuel in the repository; (2) Analogous geologic setting: fractured, welded, and altered rhyolitic ash flow tuffs overlying carbonate rocks; (3) Analogous climate: Semiarid to arid; (4) Analogous geochemistry: Oxidizing conditions; and (5) Analogous hydrogeology: The ore deposit lies in the unsaturated zone above the water table. The Nopal I deposit is approximately 8 ± 0.5 million years old and has been exposed to oxidizing conditions during the last 3.2 to 3.4 million years. The Pena Blanca Natural Analogue Model considers that the uranium oxide and uranium silicates in the ore deposit were originally analogous to uranium-oxide spent nuclear fuel. The Pena Blanca site has been characterized using field and laboratory investigations of its fault and fracture distribution, mineralogy, fracture fillings, seepage into the mine adits, regional hydrology, and mineralization that shows the extent of radionuclide migration. Three boreholes were drilled at the Nopal I mine site in 2003 and these boreholes have provided samples for lithologic characterization, water-level measurements, and water samples for laboratory analysis

  6. THE PENA BLANCA NATURAL ANALOGUE PERFORMANCE ASSESSMENT MODEL

    Energy Technology Data Exchange (ETDEWEB)

    G.J. Saulnier Jr; W. Statham

    2006-03-10

    The Nopal I uranium mine in the Sierra Pena Blanca, Chihuahua, Mexico serves as a natural analogue to the Yucca Mountain repository. The Pena Blanca Natural Analogue Performance Assessment Model simulates the mobilization and transport of radionuclides that are released from the mine and transported to the saturated zone. the Pena Blanca Natural Analogue Model uses probabilistic simulations of hydrogeologic processes that are analogous to the processes that occur at the Yucca Mountain site. The Nopal I uranium deposit lies in fractured, welded, and altered rhyolitic ash flow tuffs that overlie carbonate rocks, a setting analogous to the geologic formations at the Yucca Mountain site. The Nopal I mine site has the following characteristics as compared to the Yucca Mountain repository site. (1) Analogous source: UO{sub 2} uranium ore deposit = spent nuclear fuel in the repository; (2) Analogous geologic setting: fractured, welded, and altered rhyolitic ash flow tuffs overlying carbonate rocks; (3) Analogous climate: Semiarid to arid; (4) Analogous geochemistry: Oxidizing conditions; and (5) Analogous hydrogeology: The ore deposit lies in the unsaturated zone above the water table. The Nopal I deposit is approximately 8 {+-} 0.5 million years old and has been exposed to oxidizing conditions during the last 3.2 to 3.4 million years. The Pena Blanca Natural Analogue Model considers that the uranium oxide and uranium silicates in the ore deposit were originally analogous to uranium-oxide spent nuclear fuel. The Pena Blanca site has been characterized using field and laboratory investigations of its fault and fracture distribution, mineralogy, fracture fillings, seepage into the mine adits, regional hydrology, and mineralization that shows the extent of radionuclide migration. Three boreholes were drilled at the Nopal I mine site in 2003 and these boreholes have provided samples for lithologic characterization, water-level measurements, and water samples for laboratory

  7. Parasitism by Monogenoidea in Piaractus mesopotamicus (Characiformes, Characidae) cultivated in Paraná River (Brazil).

    Science.gov (United States)

    Leão, M S L; Justo, M C N; Bueno, G W; Cohen, S C; São Clemente, S C

    2017-11-01

    This study investigated the occurrence, prevalence, mean abundance and mean intensity of monogenoidean parasites in Piaractus mesopotamicus farmed in cages in the reservoir of the Itaipu Hydroelectric Power Station, Paraná River, Brazil. The parasite distribution pattern and the correlation of prevalence and abundance with the total length of hosts were also investigated. Four monogenoidean species were collected: Anacanthorus penilabiatus, A. toledoensis, Mymarothecium ianwhitingtoni and M. viatorum. All the parasites collected in P. mesopotamicus showed the typical aggregated distribution pattern, and the abundance and the prevalence did not shown any correlation with the total length of hosts.

  8. Parasitism by Monogenoidea in Piaractus mesopotamicus (Characiformes, Characidae cultivated in Paraná River (Brazil

    Directory of Open Access Journals (Sweden)

    M. S. L. Leão

    2017-05-01

    Full Text Available Abstract This study investigated the occurrence, prevalence, mean abundance and mean intensity of monogenoidean parasites in Piaractus mesopotamicus farmed in cages in the reservoir of the Itaipu Hydroelectric Power Station, Paraná River, Brazil. The parasite distribution pattern and the correlation of prevalence and abundance with the total length of hosts were also investigated. Four monogenoidean species were collected: Anacanthorus penilabiatus, A. toledoensis, Mymarothecium ianwhitingtoni and M. viatorum. All the parasites collected in P. mesopotamicus showed the typical aggregated distribution pattern, and the abundance and the prevalence did not shown any correlation with the total length of hosts.

  9. Plasma testosterone and 11-ketotestosterone levels of male pacu Piaractus mesopotamicus (Cypriniformes, Characidae

    Directory of Open Access Journals (Sweden)

    R. Gazola

    1997-12-01

    Full Text Available The levels of testosterone (T and 11-ketotestosterone (11-KT of the South American pacu Piaractus mesopotamicus were determined by radioimmunoassay during two stages of the reproductive cycle, i.e., resting and maturation, and the gonadosomatic index (GSI was calculated. The highest levels of T and 11-KT were reached during the maturation stage (T = 2400 ± 56 pg/ml; 11-KT = 2300 ± 60 pg/ml and lower levels were maintained during the resting period. The rise in androgen levels occurred with the appearance of spermatozoa in the maturation stage, when GSI was highest

  10. THE PENA BLANCA NATURAL ANALOGUE PERFORMANCE ASSESSMENT MODEL

    Energy Technology Data Exchange (ETDEWEB)

    G. Saulnier and W. Statham

    2006-04-16

    The Nopal I uranium mine in the Sierra Pena Blanca, Chihuahua, Mexico serves as a natural analogue to the Yucca Mountain repository. The Pena Blanca Natural Analogue Performance Assessment Model simulates the mobilization and transport of radionuclides that are released from the mine and transported to the saturated zone. The Pena Blanca Natural Analogue Performance Assessment Model uses probabilistic simulations of hydrogeologic processes that are analogous to the processes that occur at the Yucca Mountain site. The Nopal I uranium deposit lies in fractured, welded, and altered rhyolitic ash-flow tuffs that overlie carbonate rocks, a setting analogous to the geologic formations at the Yucca Mountain site. The Nopal I mine site has the following analogous characteristics as compared to the Yucca Mountain repository site: (1) Analogous source--UO{sub 2} uranium ore deposit = spent nuclear fuel in the repository; (2) Analogous geology--(i.e. fractured, welded, and altered rhyolitic ash-flow tuffs); (3) Analogous climate--Semiarid to arid; (4) Analogous setting--Volcanic tuffs overlie carbonate rocks; and (5) Analogous geochemistry--Oxidizing conditions Analogous hydrogeology: The ore deposit lies in the unsaturated zone above the water table.

  11. 75 FR 2477 - Plan Development for Kiowa, Rita Blanca, Black Kettle and McClellan Creek National Grasslands...

    Science.gov (United States)

    2010-01-15

    ... DEPARTMENT OF AGRICULTURE Forest Service Plan Development for Kiowa, Rita Blanca, Black Kettle and... Forest Service (FS) is preparing the Kiowa, Rita Blanca, Black Kettle and McClellan Creek National... effect. When the Record of Decision for the new Kiowa, Rita Blanca, Black Kettle and McClellan Creek...

  12. Hematologia e sinais clínicos de Piaractus mesopotamicus infectados experimentalmente com Aeromonas hydrophila = Hematology and clinical signs of Piaractus mesopotamicus experimentally infected with Aeromonas hydrophila

    Directory of Open Access Journals (Sweden)

    Flávio Ruas Moraes

    2009-01-01

    Full Text Available Este ensaio teve como objetivo avaliar as respostas hematológicas e a ocorrência de sinais clínico-patológicos de Piaractus mesopotamicus infectados experimentalmente por Aeromonas hydrophila. Foram utilizados 324 pacus, P. mesopotamicus, com peso de 102,84 ±27,1 g, distribuídos em 27 caixas de 300 L de capacidade, sendo 14 peixes por caixa. Os peixes foram mantidos nas caixas durante um mês, recebendo dieta balanceada, período em que se evitou qualquer tipo de manejo estressante. Passado esse período, foram infectadoscom 6 x 106 UFC de A. hydrophila, injetada via intraperitoneal. As coletas e análises de sangue foram realizadas 24h antes da infecção experimental e 24h após a infecção. Os resultados permitem concluir que a infecção por A. hydrophila em P. mesopotamicus écaracterizada por escurecimento da derme e sinais clínicos-patológicos relacionados à hemorragia, anemia normocítica-hipocrômica, redução nos níveis de proteínas, globulinasplasmáticas e eosinófilos, leucopenia, linfopenia, trombocitopenia, neutrofilia e monocitose. The purpose of this study was to evaluate the hematological response and clinical sign of Piaractus mesopotamicus infected byAeromonas hydrophila. Were used 324 pacus, P. mesopotamicus weighing 102.84 ± 27.1 g distributed in 27 water tanks with 300 L of capacity, 14 fish per tank. The fish were kept in the water tanks during one month, receiving appropriate diet. In this period was avoidedstressing management. After this period, the fish were infected with 6 × 108 cfu of A. hydrophila fish-1, injected intraperitoneally. The blood collection was carried 24h before experimental infection and 24h after its. The A. hydrophila infection in P. mesopotamicus ischaracterized by dark skin and clinical signs related to hemorrhage, hypochromic normocytic anemia, decrease on plasmatic proteins and globulins levels, leucopenia, lymphopenia, thrombocytopenia, eosinophilia, neutrophilia and monocytosis.

  13. El pintor renacentista Jácome de Blancas

    OpenAIRE

    Collar de Cáceres, Fernando

    2010-01-01

    Jácome de Blancas es pintor documentado en Medina del Campo (Valladolid) entre 1543 y 1554 Y activo acaso hasta cerca de 1574. Ninguna de sus obras de que hay memoria, realizadas con artistas como Luis Vélez o Leonardo de Carrión, se han conservado, pero hay razones para asegurar que se trata del maestro Jácome que realizó en 1550 el retablo mayor de Santa María del Castillo en Olmedo (Valladolid), y con él deben relacionarse otras pinturas existentes en las localidades vallisoletanas de Medi...

  14. Tecnologia do pescado de água doce: aproveitamento do pacu (Piaractus mesopotamicus Freshwater fish technology: utilization of "pacu"(Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    E.R. Szenttamásy

    1993-09-01

    Full Text Available Para o estudo da viabilidade do Pacu (Piaractus mesopotamicus para processamento tecnológico, foram testados os processos de defumação, salga e secagem e enlatamento. Analisou-se também a farinha dos resíduos. Utilizou-se peixes provenientes de tanques de piscicultura do município de Piracicaba-SP e o produto final foi avaliado para o consumo na merenda escolar municipal. Foram feitas análises quanto aos teores de lipídeos, umidade, proteína e cinza. Os produtos processados por salga, defumação e enlatamento foram analisados também quanto ao teor de sal (NaCl; os defumados e enlatados foram submetidos a análise sensorial com avaliação de aparência, cor, aroma, sabor e textura. O pacu "in natura", defumado, salgado seco e enlatado apresentou, em porcentagem, respectivamente, 18,99; 23,80; 52,53; 18,59 de proteína, 3,79; 2,69; 18,31; 14,34 de lipídeos e 1,82; 3,13; 17,76; 2,79 de cinza. Para o pacu enlatado 56% e 33% dos degustadores o classificaram como um produto de excelente e bom sabor. O pacu defumado foi classificado como de excelente sabor por 25% dos provadores e de bom sabor por 55%.

  15. Leukocytes respiratory burst and lysozyme level in pacu (Piaractus mesopotamicus Holmberg, 1887

    Directory of Open Access Journals (Sweden)

    JS. Abreu

    Full Text Available Innate immune responses are useful to determine the health status of fish and to evaluate the effect of immunomodulatory substances in fish farming. Leukocytes respiratory burst was measured in pacu (Piaractus mesopotamicus using chemiluminescence assay and nitroblue tetrazolium (NBT reduction assay. The nitroblue tetrazolium reduction seemed more adequate than chemiluminescence assay for leukocytes oxidative burst determination, since it was difficult to isolate the blood leucocytes for chemiluminescence assay. Plasma and serum lysozyme were measured using a turbidimetric assay. The heating of serum and plasma samples (56 ºC for 30 minutes for complement system inactivation darkened the plasma samples and interfered in the results. The lysozyme activity in serum was higher than in plasma, suggesting that serum samples are more appropriate for the analysis. This study established protocols that can be useful tools in the study of immune mechanisms of the tropical fish pacu.

  16. Growth, body composition and hematology of juvenile pacu (Piaractus mesopotamicus fed increasing levels of ractopamine

    Directory of Open Access Journals (Sweden)

    A.J.A. Bicudo

    2012-10-01

    Full Text Available The effects of four levels of dietary ractopamine (RAC on growth, body composition and hematology of pacu, Piaractus mesopotamicus juveniles (103.6±3.3g were studied. Fish were housed into 12 circular tanks of 1 m3 - 15 fish per tank - and fed for 60 days with practical diets supplemented with 0; 10; 20 or 40mg RAC per kg of diet, in a totally randomized design trial (n=3. Fish fed diets containing up to 40mg RAC/kg diet for 60 days did not have improved growth or body composition parameters. There were no significant differences in hematocrit, hemoglobin and mean corpuscular hemoglobin. Plasma glucose and triglycerides were significantly smaller in fish fed with RAC; however no significant differences between RAC levels were detected. The inclusion of up to 40mg RAC/kg of diet did not improve growth and body composition, but influenced some hematological and biochemical parameters of juvenile pacu.

  17. Serum bactericidal activity as indicator of innate immunity in pacu Piaractus mesopotamicus (Holmberg, 1887

    Directory of Open Access Journals (Sweden)

    J.D. Biller-Takahashi

    2013-12-01

    Full Text Available The immune system of teleost fish has mechanisms responsible for the defense against bacteria through protective proteins in several tissues. The protein action can be evaluated by serum bactericidal activity and this is an important tool to analyze the immune system. Pacu, Piaractus mesopotamicus, is one of the most important fish in national aquaculture. However there is a lack of studies on its immune responses. In order to standardize and assess the accuracy of the serum bactericidal activity assay, fish were briefly challenged with Aeromonas hydrophila and sampled one week after the challenge. The bacterial infection increased the concentration of protective proteins, resulting in a decrease of colony-forming unit values expressed as well as an enhanced serum bactericidal activity. The protocol showed a reliable assay, appropriate to determine the serum bactericidal activity of pacu in the present experimental conditions.

  18. BIOCHEMICAL PARAMETERS FOR Piaractus mesopotamicus, Colossoma macropomum (Characidae AND HYBRID TAMBACU (P. mesopotamicus X C. macropomum

    Directory of Open Access Journals (Sweden)

    Marcos Tavares-Dias

    2010-06-01

    Full Text Available A study for investigating the values of plasma glucose,serum total protein and serum ions (calcium, potassium, magnesium,sodium and chloride was carried out in young Colossomomamacropomum Cuvier, 1818, Piaractus mesopotamicus Holmberg,1887 and the hybrid tambacu (P. mesopotamicus x C. macropomum,kept in intensive system. Glucose concentrations were higher intambacu than in P. mesopotamicus and C. macropomum. Totalprotein levels were higher in P. mesopotamicus than both C.macropomum and tambacu. C. macropomum presented higherconcentrations of sodium and chloride, while P. mesopotamicushad higher concentrations of potassium and magnesium.However, levels of calcium were similar for the species studied.The hybrid tambacu showed the smallest levels of total protein,and intermediate levels of sodium, potassium, magnesium andchloride, compared to both P. mesopotamicus and C. macropomum.Baseline values for healthy fish in aquaculture were established,and they may be used for further comparisons in studies with wildpopulations of P. mesopotamicus and C. macropomum.

  19. Efecto de dos agentes remineralizantes en lesiones de mancha blanca: Estudio in Vitro

    OpenAIRE

    Grace Maribel Chicaiza Naranjo; Nilda Eugenia Navarrete Angulo

    2016-01-01

    La caries dental continúa siendo la enfermedad con mayor prevalencia en el mundo, es importante diagnosticarla y tratarla desde su estadio inicial de mancha blanca ya que es una lesión reversible. La aparición de nuevos materiales como el fosfopéptido de caseína- estabilizado de fosfato de calcio amorfo (Recaldent) para remineralizar las manchas blancas nos brindan más opciones terapéuticas en Odontopediatria. Objetivo: Evaluar in-vitro la remineralización de la mancha blanca a partir de la a...

  20. Alimentação e comportamento de larvas de pacu, Piaractus mesopotamicus (Holmberg, 1887 Feeding and behavior of pacu, Piaractus mesopotamicus (Holmberg, 1887 larvae

    Directory of Open Access Journals (Sweden)

    Eduardo Lopes Beerli

    2004-02-01

    Full Text Available Conduziu-se este trabalho com o objetivo de avaliar o efeito da utilização de dietas naturais e artificiais sobre o desempenho e comportamento de larvas de pacu (Piaractus mesopotamicus, entre o 2º e o 10º dia de vida. Foram utilizadas 30 caixas plásticas, cada uma com 30 litros de água e renovação contínua, onde as larvas foram mantidas durante o período experimental. Cada caixa recebeu 10 larvas por litro, totalizando 300 larvas/caixa. Foram testados 6 tratamentos, cada qual com 5 repetições. Os tratamentos foram: T1-ração, T2-plâncton, T3-artêmia, T4-plâncton + ração, T5-artêmia + ração e T6-artêmia + plâncton. As larvas foram alimentadas 6 vezes ao dia, nos horários de 4, 8, 12, 16, 20 e 24 horas. A temperatura da água foi mantida constante a 27ºC, o oxigênio dissolvido permaneceu na faixa de 6,16 ± 0,34 e o pH, entre 7,16 ± 0,22. Aos 2, 4, 6, 8 e 10 dias de vida, foram coletadas amostras de 30 larvas para determinação do comprimento total e peso. No final do experimento (10º dia, as larvas que receberam artêmia + plâncton (T6 alcançaram os maiores valores de comprimento total (8,35 mm e peso corporal (3518 µg, em relação a todas as outras dietas testadas. As larvas devem permanecer em laboratório por um período de 6 dias após a eclosão, recebendo alimento do terceiro ao sexto dia. A partir do sexto dia, as larvas estão com a vesícula gasosa completamente inflada e apresentam nado contínuo.The objective of this research was to evaluate the effect of natural and artificial diets on the development and behavior of pacu (Piaractus mesopotamicus larvae, between the 2nd and 10th day post hatch. The larvaes were kept in 30L - plastic boxes (n = 30 boxes, in constant flow-through. The larvae density was 10 post-larvae/L (300 larvae/box. Six diets with 4 sampling days (4, 6, 8 and 10 days post-hatch, n = 30 larvae using 5 repetitions were tested. The diets were: T1- commercial feed, T2- plancton, T3

  1. Pena Blanca uranium deposits and ash-flow tuffs relationship

    International Nuclear Information System (INIS)

    Magonthier, M.

    1987-01-01

    The Pena Blanca uranium deposits (Chihuahua, Mexico) are associated with a Tertiary sequence of ash-flow tuffs. Stratigraphic control is dominant and uranium mineralization occurs in stratiform and fracture-controlled deposits within 44 My-old units: Nopal Rhyolite and Escuadra Rhyolite. These units consist of highly vapor-phase crystallized ash-flow tuffs. They contain sanidine, quartz and granophyric phenocrysts, and minor ferromagnesian silicates. Nopal and Escuadra units are high-silica alkali-rich rhyolites that have a primary potassic character. The trace-element chemistry shows high concentrations in U-Th-Rb-Cs and low contents in Ba-Sr-Eu. These chemical properties imply a genetic relationship between deposits and host-units. The petrochemical study show that the Nopal Rhyolite and Escuadra Rhyolite are the source of U and of hydrothermal solutions [fr

  2. Water temperature, body mass and fasting heat production of pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    FREDY A.A. AGUILAR

    Full Text Available ABSTRACT Knowledge on fasting heat production (HEf of fish is key to develop bioenergetics models thus improving feeding management of farmed species. The core of knowledge on HEf of farmed, neotropical fish is scarce. This study assessed the effect of body mass and water temperature on standard metabolism and fasting heat production of pacu, Piaractus mesopotamicus, an omnivore, Neotropical fresh water characin important for farming and fisheries industries all through South American continent. An automated, intermittent flow respirometry system was used to measure standard metabolic rate (SMR of pacu (17 - 1,050 g at five water temperatures: 19, 23, 26, 29 and 33 °C. Mass specific SMR increased with increasing water temperature but decreased as function of body mass. The allometric exponent for scaling HEf was 0.788, and lied in the range recorded for all studied warm-water fish. The recorded van't Hoff factor (Q10 for pacu (2.06 shows the species low response to temperature increases. The model HEf = 0.04643×W0.7882×T1.837 allows to predict HEf (kJ d-1 from body mass (W, kg and water temperature (T, °C, and can be used in bioenergetical models for the species.

  3. Migratory movements of pacu, Piaractus mesopotamicus, in the highly impounded Paraná River

    Science.gov (United States)

    Makrakis, M.C.; Miranda, L.E.; Makrakis, S.; Xavier, A.M.M.; Fontes, H.M.; Morlis, W.G.

    2007-01-01

    A mark-recapture study was conducted in 1997–2005 to investigate movements of stocked pacu, Piaractus mesopotamicus, in the Paraná River Basin of Brazil, Paraguay, and Argentina. Fish raised in cages within the Itaipu Reservoir and in ponds were tagged externally (n = 2976) and released in the Itaipu Reservoir (53.2%) and bays of its major tributaries (46.8%). In total, 367 fish (12.3%) were recaptured. In all, 91% of the pacu moved away from the release site; upstream movements were more extensive than downstream movements. Pacu traveled upstream a maximum of 422 km (average of 41.3 km) at a maximum rate of 26.4 km day−1 (av. 0.8). Downstream movements were limited in terms of number of individuals and distance moved. Fish released during the wet season moved farther than those released during the dry season, and feeding rather than spawning might have been the compelling reason for movement. Although fish passed downstream through dams, none of the marked fish were detected to have moved upstream through the passage facilities. Pacu showed movement patterns not radically different from those of other neotropical migratory species, but their migratory movements may not be as extensive as those of other large migratory species in the basin.

  4. Extraction and recovery technique for myxozoan parasites from the Piaractus mesopotamicus kidney embedded in paraffin

    Directory of Open Access Journals (Sweden)

    Wilson G. Manrique

    2013-11-01

    Full Text Available Tissues fixed and embedded in paraffin for histopathological studies keep their cell characteristics. There are several protocols for extracting genetic material from tissue embedded in paraffin, but there is no protocol for material aimed at the direct identification of parasites. The lack of techniques which describe the recovery of parasites from tissue embedded in paraffin has led us to test a technique for recovering myxosporean parasites found in Piaractus mesopotamicus kidney fragments embedded in paraffin, for a rapid, direct, and economic identification. Once the excess paraffin was removed from the kidney fragment, this was deparaffinized in xylene, hydrated in 70% alcohol, placed in an Eppendorf tube containing 70% alcohol, and left under vigorous and constant agitation in a vortex until the tissue was disintegrated. The precipitated material was mixed with the 70% alcohol and 20 μL were collected for preparing the smears, which were stained with Giemsa. Myxobolus sp. spores at many developmental stages were observed by light microscopy. The technique has proved to be useful for recovering myxosporean parasites from tissue embedded in paraffin and it constitutes an effective tool for prevalence studies when the myxosporean parasites are not detected in fresh mounts.

  5. Extraction and recovery technique for myxozoan parasites from the Piaractus mesopotamicus kidney embedded in paraffin

    Directory of Open Access Journals (Sweden)

    Wilson Gomez Manrique

    2013-09-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2013v26n4p263 Tissues fixed and embedded in paraffin for histopathological studies keep their cell characteristics. There are several protocols for extracting genetic material from tissue embedded in paraffin, but there is no protocol for material aimed at the direct identification of parasites. The lack of techniques which describe the recovery of parasites from tissue embedded in paraffin has led us to test a technique for recovering myxosporean parasites found in Piaractus mesopotamicus kidney fragments embedded in paraffin, for a rapid, direct, and economic identification. Once the excess paraffin was removed from the kidney fragment, this was deparaffinized in xylene, hydrated in 70% alcohol, placed in an Eppendorf tube containing 70% alcohol, and left under vigorous and constant agitation in a vortex until the tissue was disintegrated. The precipitated material was mixed with the 70% alcohol and 20 µL were collected for preparing the smears, which were stained with Giemsa. Myxobolus sp. spores at many developmental stages were observed by light microscopy. The technique has proved to be useful for recovering myxosporean parasites from tissue embedded in paraffin and it constitutes an effective tool for prevalence studies when the myxosporean parasites are not detected in fresh mounts.

  6. Impact of electrical stunning on fish behavior and meat quality of pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Campagnoli de Oliveira Filho

    2016-01-01

    Full Text Available Electrical stunning is considered one of less stressful fish stunning method. However, for its efficiency, it is important to determine the best way of application of the electrical variables. The aim of this study was to evaluate the effect of different voltages (100, 150, and 200 V of alternating current (AC or direct current (DC, frequency of 50 Hz, for 180 s exposure, concerning the aspects of behavior and meat quality of pacu (Piaractus mesopotamicus. Fish subjected to AC remained unconscious longer, evaluated by behavior analysis, when compared to DC. The pacu subjected to 100 AC, 200 AC and 100 DC showed less bleeding in the fillets. The lightness (L* of the fillets were higher in 150 AC, 150 DC and 100 DC, followed by 200 and 100 AC. The redness (a* in pacu fillets were moderate in treatments 200 and 150 AC and less intense in treatments 100 DC and 100 AC. The yellowness (b* was higher in fish fillets treatment 150 DC and lower in 100 AC. Therefore, the 200 V alternating current (AC used in water stunning caused apparent unconsciousness of up to 4 min. after exposure and less bleeding in fillets, thus it is a suitable stunning method to be recommended for the pacu processing industry.

  7. Gill chemoreceptors and cardio-respiratory reflexes in the neotropical teleost pacu, Piaractus mesopotamicus.

    Science.gov (United States)

    Leite, C A C; Florindo, L H; Kalinin, A L; Milsom, W K; Rantin, F T

    2007-09-01

    This study examined the location and distribution of O(2) chemoreceptors involved in cardio-respiratory responses to hypoxia in the neotropical teleost, the pacu (Piaractus mesopotamicus). Intact fish and fish experiencing progressive gill denervation by selective transection of cranial nerves IX and X were exposed to gradual hypoxia and submitted to intrabuccal and intravenous injections of NaCN while their heart rate, ventilation rate and ventilation amplitude were measured. The chemoreceptors producing reflex bradycardia were confined to, but distributed along all gill arches, and were sensitive to O(2) levels in the water and the blood. Ventilatory responses to all stimuli, though modified, continued following gill denervation, however, indicating the presence of internally and externally oriented receptors along all gill arches and either in the pseudobranch or at extra-branchial sites. Chemoreceptors located on the first pair of gill arches and innervated by the glossopharyngeal nerve appeared to attenuate the cardiac and respiratory responses to hypoxia. The data indicate that the location and distribution of cardio-respiratory O(2) receptors are not identical to those in tambaqui (Colossoma macropomum) despite their similar habitats and close phylogenetic lineage, although the differences between the two species could reduce to nothing more than the presence or absence of the pseudobranch.

  8. Na2EDTA anticoagulant impaired blood samples from the teleost Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Thaís Heloisa Vaz Farias

    2016-05-01

    Full Text Available Abstract: The present study aimed to evaluate the effects of Na heparin and Na2EDTA on blood of Piaractus mesopotamicus (360.7±42.4g, 26.4±1.0cm. Twenty fishes were sampled in two experiment trials, ten for erythrocyte fragility analysis and ten for hematologic and plasma biochemical study. The blood collected by venous-caudal puncture was fractioned and stored in anticoagulants solution: Na2EDTA 10%, Na2EDTA 3%, Na heparin 5000 IU and Na heparin 100 IU. Plasmatic levels of calcium presented in the Na2EDTA stored samples were about 80% lower than both heparin groups. Blood samples of P. mesopotamicus stored with Na2EDTA demonstrated increase in the hematocrit and MCV, and decrease in MCHC. The dose-response effect was observed in this study. The results are reinforced by the higher levels of plasmatic protein and hemolysis presented in the Na2EDTA 10% stored blood, confirming the deleterious effect of this anticoagulant treatment on the quality of blood samples. Na2EDTA is not indicated to store P. mesopotamicus blood samples, but sodium heparin at 100 IU is the most recommended anticoagulant, since this treatment presented the lower rate of alterations in the stored blood.

  9. Phenotypic plasticity associated to environmental hypoxia in the neotropical serrasalmid Piaractus mesopotamicus (Holmberg, 1887 (Characiformes: Serrasalmidae

    Directory of Open Access Journals (Sweden)

    María Alejandra Fernández-Osuna

    Full Text Available ABSTRACT Many South American characid fishes develop reversible dermal protuberances in the jaws to optimize aquatic surface respiration (ASR during hypoxia. To date, basic aspects of this adaptation remain unknown, mainly due to the scarcity of experimental studies. In laboratory experiments, we determined time necessary for the complete formation and reversion of these structures in Piaractus mesopotamicus , and studied comparatively behavioral, morphological, and respiratory responses along gradients of dissolved oxygen (DO concentration. Morphological changes during hypoxia consisted in dermal protuberances of lower lip, anterior border of maxillary and distal border of opercular valve, increasing the known number of structures modified. These structures developed completely in less than 6 hours and reversed in less than 3 hours. Most of observed traits showed a logistic response curve with threshold DO values between 0.90 and 2.70 mgL-1. Respiratory frequency and opercular valve development showed similar threshold values above the level of tolerance of DO, whereas ASR and dermal protuberances of the jaws showed threshold values below this level. This observation supports the functional link between these groups of behavioral and morphological traits. This study demonstrates that this species is able to modify reversibly portions of the respiratory system to optimize responses to hypoxia.

  10. Myxosporidiosis in intensively-reared Piaractus mesopotamicus: Histopathological diagnosis by means of Ziehl-Neelsen staining

    Directory of Open Access Journals (Sweden)

    Wilson G. Manrique

    2012-11-01

    Full Text Available Samples of different organs from intensively-reared Piaractus mesopotamicus were collected and processed using routine histological techniques in order to produce thin sections for staining with hematoxylin-eosin and with the Ziehl-Neelsen method. Through examination under an optical microscope, myxosporidians of the genera Henneguya sp. and Myxobolus sp. were identified, respectivelyin the gills and kidneys of P. mesopotamicus. Plasmodia with immature spores of Henneguya sp. were located along the secondary lamellae, with total length of 30.45±4.84µm and width of 3.52±0.33µm. Spores of Myxobolus sp. were located in the kidneys, with total length of 8.94±0.82µm and width of 5.59±0.39µm. Histopathological analysis of the gills showed plasmodia containing spores of Henneguya sp., at intralamellar and intravascular localities, at different stages of development. Spores of Myxobolus sp. were identified in the kidneys, in the peritubular region and in the interstices and glomerulus, surrounded by melanomacrophages. Focal hemorrhage was recorded in a few cases. Ziehl-Neelsen staining allowed to identify particular features of the spores and facilitated biometry and enabled classification in comparison with hematoxylin-eosin, thus demonstrating its usefulness for histopathological diagnosis of the parasitosis.

  11. Paraoxonase activity in sera from Piaractus mesopotamicus Holmberg (Characidae and Hypostomus punctatus Valenciennes (Siluridae

    Directory of Open Access Journals (Sweden)

    Vera Lucia F. Cunha Bastos

    1998-01-01

    Full Text Available A paraoxonase activity present in serum of two Brazilian fish species was consistently assayed at pH 8.5 using 7.5 mM paraoxon final concentration. The paraoxonase activity was more activated by 0.5 M NaCl in serum of Piaractus mesopotanricus Holmberg, 1887 (pacu than in serum of Hypostomus punctatus Valenciennes, 1840 (cascudo. Apparent values of K M were 3.3 x 10-3 M for cascudo and pacu paraoxonase activity in the presence of 0.5 M NaCl. Apparent maximum velocity values calculated in the presence of 0.5 M NaCl were 6.1 and 6.5 nmole/min/mL of serum for cascudo and pacu, respectively. Vmax/K M ratio values of determinations in the presence and absence of 0.5 M NaCl showed that NaCl had a more evident effect on increasing the affinity of serum paraoxonase for paraoxon in pacu serum. Young specimens of pacu showed a marked decreased paraoxonase serum activity when kept in tanks treated with 0.25 ppm methyl-parathion.

  12. Efeito da granulometria do milho no desempenho de juvenis de pacu, Piaractus mesopotamicus (Holmberg, 1887

    Directory of Open Access Journals (Sweden)

    M.F Polese

    2010-12-01

    Full Text Available Avaliou-se o efeito de diferentes granulometrias do milho da ração no desempenho de juvenis de pacu, Piaractus mesopotamicus. Foram utilizados 120 juvenis com peso inicial de 8,42±0,89, comprimento total de 7,03±0,20cm, comprimento padrão de 6,32±0,13cm e altura de 3,21±0,11cm, distribuídos em 20 aquários (300L, na densidade de seis peixes por unidade experimental (aquário, em delineamento inteiramente ao acaso, com cinco tratamentos constituídos por diferentes granulometrias - 850, 710, 500, 300, 150µm - do milho na composição da ração. Cada tratamento tinha quatro repetições. O tratamento que proporcionou melhor desempenho dos animais foi o com granulometria do milho de 150µm, destacando-se a conversão alimentar de 1,38, enquanto no tratamento com maior granulometria a conversão alimentar foi de 1,61. Assim, recomenda-se usar a granulometria de 150µm.

  13. Growth, survival and bone alterations in Piaractus mesopotamicus larvae under different rearing protocols

    Directory of Open Access Journals (Sweden)

    David Roque Hernández

    2015-09-01

    Full Text Available The pacu (Piaractus mesopotamicus is a neotropical freshwater fish. It is one of the most important species farmed in areas of the Parana and Paraguay Rivers basins. The effects of different rearing protocols on growth, survival and incidence of skeletal malformations in pacu larvae were analyzed. A total of six experimental treatments were considered, consisting of: a semi-intensive larviculture (LS in ponds; intensive larviculture (LIn in laboratory (both LS and LIn until 60 days of life; and mixed larviculture, with 20 days of semi-intensive larviculture into cages in ponds after 14 (L1, 21 (L2, 33 (L3 or 40 (L4 days of laboratory larviculture. At the end of the experimental period, LSlarvae showed higher growth rate, with average weight values (2.28g and total length (TL-48.20mm statistically higher than the rest (P1 to L4 treatments showed intermediate growth values, without differences between them (P>0.05, while LIn presented the lowest growth (PS, that presented a significantly lower value (17.5%, PIn and L1 presented the lowest incidence. In no case, visible morphological alterations were found. This study shows that prolonging pacu rearing under laboratory conditions at high densities improves temporal availability and survival of juvenile without affecting growth or subsequent osteological development of fish.

  14. Haematological characteristics of Brazilian Teleosts: III. Parameters of the hybrid tambacu (Piaractus mesopotamicus Holmberg x Colossoma macropomum Cuvier (Osteichthyes, Characidae

    Directory of Open Access Journals (Sweden)

    Marcos Tavares-Dias

    2000-12-01

    Full Text Available Fifty six specimens of the hybrid "tambacu" (Piaractus mesopotamicus Holmberg, 1887 male x Colossoma macropomum Cuvier, 1818 female were collected from fishfarm of Guariba, São Paulo, to evaluate their haematology. Fishes presented 400.0 to 3,100.0 g total weight and 20.0 to 52.0 cm total length. Haemoglobin, haematocrit, mean corpuscular haemoglobin content (MCHC and percentage of defense blood cells including leucocytes and thrombocytes, were studied. Statistical analysis showed positive correlation (P<0.01 between haematocrit, MCHC and haemoglobin rate. Nevertheless, thrombocytes and lymphocytes showed negative correlation (P<0.01.

  15. Occurrence and ultrastructural characterization of "nuage" during oogenesis and early spermatogenesis of Piaractus mesopotamicus Holmberg, 1887 (Teleostei

    Directory of Open Access Journals (Sweden)

    F. C. Abdalla

    Full Text Available We investigated the occurrence and ultrastructurally characterized electrondense nuclear material (nuage released from the nucleus during oogenesis and early spermatogenesis of Piaractus mesopotamicus, a fish from Pantanal Matogrossense (Brazil having a seasonal reproductive cycle. The female germ cells presented two instances of nuclear material extrusion: in the oogonia and in the oocyte in the perinucleolar phase. In males, material with similar morphology and behavior occurred in the spematogonia. In all cases, this material was associated to mitochondria. The possible function of this material is discussed.

  16. Role of erosion and isostasy in the Cordillera Blanca uplift: Insights from landscape evolution modeling (northern Peru, Andes)

    Science.gov (United States)

    Margirier, Audrey; Braun, Jean; Robert, Xavier; Audin, Laurence

    2018-03-01

    The processes driving uplift and exhumation of the highest Peruvian peaks (the Cordillera Blanca) are not well understood. Uplift and exhumation seem closely linked to the formation and movement on the Cordillera Blanca normal fault (CBNF) that delimits and shapes the western flank of the Cordillera Blanca. Several models have been proposed to explain the presence of this major normal fault in a compressional setting, but the CBNF and the Cordillera Blanca recent rapid uplift remain enigmatic. Whereas the Cordillera Blanca morphology demonstrates important erosion and thus a significant mass of rocks removal, the impact of erosion and isostasy on the evolution of the Cordillera Blanca uplift rates has never been explored. We address the role of erosion and associated flexural rebound in the uplift and exhumation of the Cordillera Blanca with numerical modeling of landscape evolution. We perform inversions of the broad features of the present-day topography, total exhumation and thermochronological data using a landscape evolution model (FastScape) to provide constraints on the erosion efficiency factor, the uplift rate and the temperature gradient. Our results evidence the not negligible contribution of erosion and associated flexural rebound to the uplift of the Cordillera Blanca and allow us to question the models previously proposed for the formation of the CBNF.

  17. Effect of ractopamine on the chemical and physical characteristics of pacu(Piaractus mesopotamicus steaks

    Directory of Open Access Journals (Sweden)

    L.M.F.S. Oliveira

    2014-02-01

    Full Text Available The objective was to evaluate the use of ractopamine (RAC in the diet for pacu (Piaractus mesopotaminus in the finishing phase on some quality parameters of the fillets. Thirty-five animals weighing 0.868±0.168kg were distributed in a completely randomised design with five treatments (0.0 - control; 11.25, 22.50, 33.75 and 45 ppm of RAC and seven replicates with two fillets obtained from the same animal. The diets were isocaloric and isoprotein and experimental time was 90 days. RAC did not affect (P>0.05 the initial pH or ph after 24 hours of the fillets. Compared to the control, RAC increased (P<0.05 the moisture content of the fillets in natura and lipid oxidation of samples stored for 12 days in the refrigerator or freezer for 60 days. The RAC in 11.25 ppm reduced (P<0.05 the lipid content, while 45 ppm reduced (P<0.05 the crude protein in the fillets. Considering only RAC, there was a linear increase (P<0.05 in the lipid content (P<0.05 and a linear reduction in crude protein and weight loss after cooking the fillets. There was a quadratic effect (P<0.05 on the ash content, weight loss and lipid oxidation in fillets stored in the refrigerator or freezer. A RAC dose of 33.75 ppm resulted in a lower lipid oxidation index. In conclusion, ractopamine at 11.25 ppm is effective for reducing the fat content in fillets of pacu, although it increases the formation of peroxides in samples kept in the freezer for longer than 60 days. At 33.75 ppm, ractopamine is effective in reducing the effect of oxidation during storage in the refrigerator or freezer.

  18. Chronic granulomatous inflammation in teleost fish Piaractus mesopotamicus: histopathology model study

    Directory of Open Access Journals (Sweden)

    Wilson G Manrique

    2017-01-01

    Full Text Available Objective. This study evaluated the cell kinetic and formation of granuloma during chronic inflammation induced by Bacillus Calmette-Guérin (BCG in the skeletal muscle of Piaractus mesopotamicus, as a histopathology model to study innate immunity. Materials and methods. Sixty fish were divided in two groups: BCG-inoculated and non-inoculated fish and the inflammatory response analyzed 3, 7, 14, 21 and 33 days post-inoculation (DPI by histopathology after hematoxylin-eosin and Ziehl-Neelsen staining. Results. 3 DPI of BCG showed a diffuse inflammatory reaction mostly composed by mononuclear cells. The inflammation continued diffuse 7 DPI initiating the cellular organization surrounding the inoculum and have continued at 14 DPI with discrete presence of epithelioid-like type cells with acidophilic cytoplasm and floppy chromatin. Higher cellular organization (21 DPI surrounding the granuloma with intense peripheral mononuclear inflammatory infiltrate and nevertheless, an increase in the number of fibroblasts and macrophage-like cells was observed. The inflammatory process became less diffuse 33 DPI with formation of small amount of granuloma surrounded by the same type of reaction found in bigger granuloma. Both the young and old granuloma presented typical characteristic around the inoculum composed by a layer of epithelioid-like type cells, besides macrophages, some lymphocytes and abundant fibroblasts. Conclusions. This study showed the feasibility in the use of pacus to study chronic granulomatous inflammatory response induced by BCG, characterized by changes in the kinetics of inflammatory cells in skeletal muscle classifying as immune-epithelioid type, similar to granulomatous inflammation caused by M. marinum in teleost fish.

  19. Efecto de dos agentes remineralizantes en lesiones de mancha blanca: Estudio in Vitro

    Directory of Open Access Journals (Sweden)

    Grace Maribel Chicaiza Naranjo

    2016-07-01

    Full Text Available La caries dental continúa siendo la enfermedad con mayor prevalencia en el mundo, es importante diagnosticarla y tratarla desde su estadio inicial de mancha blanca ya que es una lesión reversible. La aparición de nuevos materiales como el fosfopéptido de caseína- estabilizado de fosfato de calcio amorfo (Recaldent para remineralizar las manchas blancas nos brindan más opciones terapéuticas en Odontopediatria. Objetivo: Evaluar in-vitro la remineralización de la mancha blanca a partir de la aplicación de las pastas dentales a base de Recaldent: Mi Paste y Mi Paste Plus en dientes temporales. Materiales y métodos: Fueron utilizados 30 dientes temporales sanos obtenidos por movilidad fisiológica, divididos en Grupo A 15 dientes, Grupo B 15 dientes, en ambos grupos se generó la mancha blanca con un agente desmineralizante, para la remineralización  al grupo A se le aplicó Mi Paste, al grupo B Mi Paste Plus, se evaluó el grado de desmineralización y remineralización mediante un láser, Diagnodent, después de 10 días de la aplicación de las pastas dentales. Resultados: Se demostró que en ambos grupos existió remineralización de la mancha blanca, 14.73 grados de fluorescencia con Mi Paste y 15.67 grados con Mi Paste Plus, siendo mayor el grupo B. Conclusión: Concluyendo que, si existe remineralización de la mancha blanca a partir de la aplicación de pasta dental, Mi Paste y Mi Paste Plus con derivados de la caseína (Recaldent en dientes temporales, estudio in vitro. Logrando mejores resultados al utilizar Mi Paste Plus. 

  20. En la ciudad blanca: visiones y representaciones de Lisboa en la literatura y el cine

    Directory of Open Access Journals (Sweden)

    Felipe Cammaert

    2017-12-01

    Full Text Available Desde que Baudelaire se refiriera a Lisboa como una ciudad hecha de luz, mármol y agua, la capital portuguesa ha estado indisociablemente ligada a la imagen de la cuidad blanca. A lo largo del siglo XX, las diferentes miradas literarias y cinematográficas sobre Lisboa vuelven sobre el “mito” de la ciudad blanca, ya sea para afirmarlo o cuestionarlo. Apoyándonos en ejemplos concretos de escritores y directores cinematográficos portugueses y extranjeros, comentaremos algunas de las más significativas visiones y representaciones del paisaje urbano contemporáneo asociadas a Lisboa, desde la perspectiva baudelairiana.

  1. Tipo de alimento, sobrevivência e desempenho inicial de pós-larvas de pacu (Piaractus mesopotamicus Types of preys on growth and survival of pacu (Piaractus mesopotamicus pos-larvae

    Directory of Open Access Journals (Sweden)

    Martha Janeth Prieto

    2006-10-01

    Full Text Available Conduziu-se este trabalho com o objetivo de avaliar a viabilidade técnica do uso de zooplâncton enriquecido na alimentação de pós-larvas de pacu (Piaractus mesopotamicus. Na Estação Ambiental de Itutinga, da Companhia Energética de Minas Gerais (CEMIG, foi realizada, durante 5 dias, a larvicultura de pacu, usando 30 caixas plásticas com capacidade de 30 litros de água e renovação contínua, em uma densidade de 10 pós-larvas por litro; foram avaliados 6 tratamentos de alimentação: zooplâncton sem enriquecimento, zooplâncton com 4 diferentes níveis de enriquecimento (0,1; 0,5; 1,0; 1,5g de óleo de peixe e náuplios de artêmia, em um delineamento em blocos casualizados com 6 tratamentos e 5 repetições. Foram avaliados os parâmetros de desempenho nas pós-larvas, comprimento, peso, sobrevivência e resistência ao estresse. Os resultados demonstraram que o uso de zooplâncton enriquecido é viável na larvicultura de pacu, permitindo adequado desempenho das pós-larvas quanto ao comprimento, à sobrevivência e à resistência ao estresse.The objective of this study was to evaluate the technical viability of the ooplankton enriched used in the feeding of pacu (Piaractus mesopotamicus pos-larvaes. In the Environmental Station of Itutinga of the Energy Company of Minas Gerais (CEMIG this experiment was developmented, for 5 days last , the pacu larvicultura, by using 30 plastic boxes with capacity of 30 liters of water and continuous renewal, in a density of 10 powder-larvas per liter; they were appraised 6 feeding treatments: ooplankton without enrichment, ooplankton with 4 different enrichment levels (0,1; 0,5; 1,0; 1,5 g of fish oil and artêmia náuplios, in a randomly blocks design with 6 treatments and 5 repetitions. The performance of larvaes as well as length, weight, survival and resistance to the stress were evaluated. The results shown that the ooplankton enriched is viable in the pacu (Piaractus mesopotamicus pos

  2. Microscopia eletrônica de varredura de parasitos branquiais de Piaractus mesopotamicus Holmberg, 1887 cultivados no Estado de São Paulo, Brasil Scanning electron microscopy of the gill parasites of cultivated Piaractus mesopotamicus Holmberg, 1887 in the State of São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Maurício Laterça Martins

    2000-05-01

    Full Text Available Foram coletados 15 exemplares de Piaractus mesopotamicus (pacu, medindo em torno de 15 cm de comprimento padrão, de tanques do Centro de Aqüicultura da Unesp, Jaboticabal, SP, Brasil. Os peixes foram mantidos em aquários de 350 litros para posterior sacrifício com MS-222. Os filamentos brânquiais foram fixados em glutaraldeído a 3% para a microscopia eletrônica de varredura. Foram observados espécimes de Trichodina sp (Ciliophora, Henneguya piaractus (Myxozoa, e Anacanthorus penilabiatus (Monogenea, atacando o epitélio branquial. Neste trabalho, foram reportados a morfologia externa dos parasitos e as alterações no epitélio branquial dos peixes parasitadosFifteen specimens of Piaractus mesopotamicus (pacu, measuring 15 cm standard length, were collected from a fishpond at Aquaculture Center of Unesp, Jaboticabal, SP, Brazil. Fishes were maintained in 350 L aquariums for a further sacrifice with MS-222. For the Scanning Electron Microscopy, gill filaments were fixed in 3% glutaraldehyde. Specimens of Trichodina sp (Ciliophora, Henneguya piaractus (Myxozoa and Anacanthorus penilabiatus (Monogenea attacking on the gill epithelium were observed. In the present paper, the external morphology of parasites and the alterations in the gill epithelium of parasitized fishes were reported

  3. Vascular plants and a brief history of the Kiowa and Rita Blanca National Grasslands

    Science.gov (United States)

    Donald L. Hazlett; Michael H. Schiebout; Paulette L. Ford

    2009-01-01

    Administered by the USDA Forest Service, the Kiowa and Rita Blanca National Grasslands occupy 230,000 acres of public land extending from northeastern New Mexico into the panhandles of Oklahoma and Texas. A mosaic of topographic features including canyons, plateaus, rolling grasslands and outcrops supports a diverse flora. Eight hundred twenty six (826) species of...

  4. Glacial lake outburst floods in the area of Huarás, Cordillera Blanca, Peru

    Czech Academy of Sciences Publication Activity Database

    Vilímek, V.; Zapata, M. L.; Klimeš, Jan

    2005-01-01

    Roč. 39, - (2005), s. 115-124 ISSN 0081-6434 Grant - others:GA MŠk(CZ) LA 157 Institutional research plan: CEZ:AV0Z30460519 Keywords : GLOFs * Cordillera Blanca * Peru Subject RIV: DC - Siesmology, Volcanology, Earth Structure

  5. STRATIGRAPHY OF THE PB-1 WELL, NOPAL 1 URANIUM DEPOSIT, PENA BLANCA, CHIHUAHUA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    P. Dobson

    2005-09-14

    The objectives of this report are: (1) Stratigraphic study part of integrated research project examining migration of radionuclides at Pena Blanca; (2) Immediate objectives of study include: locate stratigraphic contacts in third dimension; measure rock properties (matrix permeability, porosity, mineralogy, cation exchange capacity) of cored section; determine fracture frequency and orientation; (3) Results of study serve as primary inputs to flow and transport models.

  6. Molecular cloning and sequence analysis of growth hormone cDNA of Neotropical freshwater fish Pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Janeth Silva Pinheiro

    2008-01-01

    Full Text Available RT-PCR was used for amplifying Piaractus mesopotamicus growth hormone (GH cDNA obtained from mRNA extracted from pituitary cells. The amplified fragment was cloned and the complete cDNA sequence was determined. The cloned cDNA encompassed a sequence of 543 nucleotides that encoded a polypeptide of 178 amino acids corresponding to mature P. mesopotamicus GH. Comparison with other GH sequences showed a gap of 10 amino acids localized in the N terminus of the putative polypeptide of P. mesopotamicus. This same gap was also observed in other members of the family. Neighbor-joining tree analysis with GH sequences from fishes belonging to different taxonomic groups placed the P. mesopotamicus GH within the Otophysi group. To our knowledge, this is the first GH sequence of a Neotropical characiform fish deposited in GenBank.

  7. Regional Analysis of the Hazard Level of Glacial Lakes in the Cordillera Blanca, Peru

    Science.gov (United States)

    Chisolm, Rachel E.; Jhon Sanchez Leon, Walter; McKinney, Daene C.; Cochachin Rapre, Alejo

    2016-04-01

    The Cordillera Blanca mountain range is the highest in Peru and contains many of the world's tropical glaciers. This region is severely impacted by climate change causing accelerated glacier retreat. Secondary impacts of climate change on glacier retreat include stress on water resources and the risk of glacial lake outburst floods (GLOFs) from the many lakes that are forming and growing at the base of glaciers. A number of GLOFs originating from lakes in the Cordillera Blanca have occurred over the last century, several of which have had catastrophic impacts on cities and communities downstream. Glaciologists and engineers in Peru have been studying the lakes of the Cordillera Blanca for many years and have identified several lakes that are considered dangerous. However, a systematic analysis of all the lakes in the Cordillera Blanca has never before been attempted. Some methodologies for this type of systematic analysis have been proposed (eg. Emmer and Vilimek 2014; Wang, et al. 2011), but as yet they have only been applied to a few select lakes in the Cordillera Blanca. This study uses remotely sensed data to study all of the lakes of the Glacial Lake Inventory published by the Glaciology and Water Resources Unit of Peru's National Water Authority (UGRH 2011). The objective of this study is to assign a level of potential hazard to each glacial lake in the Cordillera Blanca and to ascertain if any of the lakes beyond those that have already been studied might pose a danger to nearby populations. A number of parameters of analysis, both quantitative and qualitative, have been selected to assess the hazard level of each glacial lake in the Cordillera Blanca using digital elevation models, satellite imagery, and glacier outlines. These parameters are then combined to come up with a preliminary assessment of the hazard level of each lake; the equation weighting each parameter draws on previously published methodologies but is tailored to the regional characteristics

  8. Geologic studies in the Sierra de Pena Blanca, Chihuahua, Mexico

    Science.gov (United States)

    Reyes-Cortes, Ignacio Alfonso

    The Sierra del Cuervo has been endowed with uranium mineralization, which has attracted many geological studies, and recently the author was part of a team with the goal of selecting a site of a radioactive waste repository. The first part of the work adds to the regional framework of stratigraphy and tectonics of the area. It includes the idea of a pull apart basin development, which justifies the local great thickness of the Cuervo Formation. It includes the regional structural frame work and the composite stratigraphic column of the Chihuahua Trough and the equivalent Cretaceous Mexican Sea. The general geologic features of the NE part of the Sierra del Cuervo are described, which include the folded ignimbrites and limestones in that area; the irregular large thicknesses of the Cuervo Formation; and the western vergence of the main folding within the area. Sanidine phenocrystals gave ages of 54.2 Ma and 51.8 Ma ± 2.3 Ma. This is the first time these dates have been reported in print. This age indicates a time before the folded structures which outcrop in the area, and 44 Ma is a date after the Cuervo Formation was folded. The Hidalgoan orogeny cycle affected the rocks between this lapse of time. Since then the area has been partially affected by three tensional overlapped stages, which resulted in the actual Basin and Range physiography. The jarosite related to the tectonic activity mineralization has been dated by the Ar-Ar method and yields an age of 9.8 Ma. This is the first report of a date of mineralization timing at Pena Blanca Uranium District in the Sierra del Cuervo. These are some of the frame work features that justify the allocation of a radioactive waste repository in the Sierra del Cuervo. An alluvial fan system within the Boquilla Colorada microbasin was selected as the best target for more detailed site assessment. The study also included the measurement of the alluvium thicknesses by geoelectric soundings; studies of petrography and weathered

  9. [Aquatic insects and water quality in Peñas Blancas watershed and reservoir].

    Science.gov (United States)

    Mora, Meyer Guevara

    2011-06-01

    The aquatic insects have been used to evaluate water quality of aquatic environments. The population of aquatic insects and the water quality of the area were characterized according to the natural and human alterations present in the study site. During the monthly-survey, pH, DO, temperature, water level, DBO, PO4 and NO3 were measured. Biological indexes (abundance, species richness and the BMWP-CR) were used to evaluate the water quality. No relation between environmental and aquatic insects was detected. Temporal and spatial differences attributed to the flow events (temporal) and the presence of Peñas Blancas reservoir (spatial). In the future, the investigations in Peñas Blancas watershed need to be focused on determining the real influence of the flows, sediment release and the possible water quality degradation because of agriculture activities.

  10. Antibiotic resistence of Aeromonas hydrophila isolated from Piaractus mesopotamicus (Holmberg, 1887 and Oreochromis niloticus (Linnaeus, 1758 Resistência de Aeromonas hydrophila isolada de Piaractus mesopotamicus (Holmberg, 1887 e Oreochromis niloticus (Linnaeus, 1758 a antibióticos

    Directory of Open Access Journals (Sweden)

    Andréa Belém-Costa

    2006-06-01

    Full Text Available One of the most important problems involving treatments with antibiotics against Aeromonas hydrophila isolated from fishes is that antibiotic resistance develops readily. The antimicrobial activity of chemotherapeutants in isolates from pacu Piaractus mesopotamicus (Holmberg, 1887 and tilapia Oreochromis niloticus (Linnaeus, 1758 was tested by the Kirby-Bauer disk method, over Mueller-Hinton surface agar previously inoculated with 100 µL of bacterial suspensions. After regular incubation, isolates from tilapia and pacu were uniformly resistant to amoxicillin, ampicillin, lincomycin, novobiocin, oxacillin, penicillin, and trimetoprim+sulfametoxazole. The A. hydrophila type strain presented resistance to the same antimicrobial substances and also against rifampicin; the bacterial isolate from pacu were the only strain resistant to tetracyclin. Isolates from both pacu and tilapia had intermediate reaction with erytromycin. The use of drugs in commercial fish farms in Brazil can favor the development of resistant bacterial strains in native fish species as already observed for exotic species, commercially produced for longer time.Um dos maiores problemas envolvendo o tratamento com antibióticos contra Aeromonas hydrophila isolada de peixes confinados é a rápida resistência ao antibiótico desenvolvida pela bactéria. A atividade antimicrobiana de quimioterapêuticos em isolados a partir de pacu Piaractus mesopotamicus (Holmberg, 1887 e tilápia Oreochromis niloticus (Linnaeus, 1758 foi verificada pelo método de difusão de antibiótico em discos de Kirby-Bauer, sobre uma superfície de Agar Mueller-Hinton previamente inoculada com 100 µL de suspensão bacteriana. Após o período de incubação, os isolados de tilápia e pacu foram uniformemente resistentes a amoxicilina, ampicilina, lincomicina, novobiocina, oxacilina, penicilina e trimetoprim+sulfametoxazol. A cepa tipo para A. hydrophila apresentou resistência às mesmas subst

  11. Estudo do potencial do pacu (Piaractus mesopotamicus como agente de controle biológico de Egeria densa, E. najas e Ceratophyllum demersum Evaluation of the biocontrol potential of pacu (Piaractus mesopotamicus for Egeria densa, E. najas and Ceratophyllum demersum

    Directory of Open Access Journals (Sweden)

    D.M.Y. Miyazaki

    2003-01-01

    Full Text Available Visando fornecer subsídios para elaboração de sistema de manejo integrado das grandes massas de plantas daninhas aquáticas submersas em lagos e represas, o presente trabalho teve como objetivo verificar a eficiência do pacu (Piaractus mesopotamicus como agente de controle biológico de Egeria densa, E. najas e Ceratophyllum demersum. As espécies de plantas daninhas foram oferecidas individualmente, duas a duas e as três espécies juntas. Verificou-se que este peixe tem uma eficiência média de controle dessas plantas daninhas variando entre 28 e 100%, podendo eliminar uma massa verde dessas plantas, com a mesma quantidade de seu peso, em sete dias. A eficiência de controle diária aumentou com o tempo de predação. O pacu é mais seletivo para E. densa ou E. najas quando na presença de C. demersum. Não ocorreu alteração na eficiência de controle do pacu sobre E. densa ou E. najas em todos os tratamentos e nos três períodos estudados (três, cinco e sete dias.In order to provide basic information for the establishment of integrated management systems for submersed aquatic weeds in lakes and reservoirs, this research evaluated the efficiency of pacu (Piaractus mesopotamicus as a biocontrol agent of Egeria densa, E. najas and Ceratophyllum demersum. One, two and the three plant species together were offered to the fish. The average efficacy of this fish to control these plants ranged between 28 and 100%. The fish could eliminate a fresh mass of these plants, equivalent to its body weight, in seven days of predation period. Control efficiency increased with increasing duration of the trials. Pacu is more selective in controlling E. densa or E. najas when in the presence of C. demersum. No decreased efficacy was observed in the control of E. densa or E. najas in any of the treatments nor in any of three time periods studied (3, 5, and 7 days.

  12. Desenvolvimento e diferenciação dos ovócitos de pacu, Piaractus mesopotamicus (Holmberg, 1887 (Osteichthyes, Characidae Oocyte development and differentiation in pacu, Piaractus mesopotamicus (Holmberg, 1887 (Osteichthyes, Characidae

    Directory of Open Access Journals (Sweden)

    Massuka Yamane Narahara

    2002-05-01

    Full Text Available O objetivo deste trabalho foi o de esclarecer dúvidas referentes ao desenvolvimento e à diferenciação dos ovócitos de Piaractus mesopotamicus (Osteichthyes, Characidae, ultra-estruturalmente, acompanhando as transformações que ocorreram durante o processo de ovogênese tais como: formação e acúmulo de várias organelas, inclusões nucleares e/ou citoplasmáticas e a camada ou envelope folicular. Na fase de crescimento primário são evidentes os corpúsculos de Balbiani, mas não são claros seus papéis. Estão presentes, também, as peculiares estruturas lamelares. A segunda fase, a de crescimento secundário, caracteriza-se, inicialmente, pela formação de alvéolos corticais. A seguir, os grânulos de vitelo protéico formam-se na região periférica com abundância de mitocôndrias e ribossomos. Mudanças no epitélio folicular (granulosa são descritas concomitantemente com a formação da zona radiata, que constitui o envoltório folicular (envelope.This work aim is to clarify doubts about the Piaractus mesopotamicus (Osteichthyes, Characidae oocyte ultrastructural development and differentiation, following the transformations during the ovogenic processes, such as formation and accumulation of various organelles, nucleolar and/or citoplasmic inclusions, and follicular wall (envelope. During the primary growth phase, Balbiani corpuscles are evident, but their role is not clear. The peculiar lamellae structures are also present. The second phase (secondary growth is initially characterized by cortical alveolus formation. After that, protein yolk granules appear in the peripherical regions, where mitochondria and ribosomes are abundant. Changes in the follicle epitelium (granulosa are described together with the radiate zone formation, which constitutes the follicular envelope.

  13. El Complejo Petroquímico de Bahía Blanca: una historia sinuosa

    Directory of Open Access Journals (Sweden)

    Odisio, Juan Carlos

    2008-01-01

    Full Text Available Este artigo procura abordar os problemas que enfrentou a instalação do Complexo Petroquímico em Bahia Blanca, desde o início dos anos 1970. Mesmo quando o pólo obteve um forte impulso do Estado, enfrentou várias dificuldades, as quais fizeram com o prazo estimado para o começo definitivo das operações fosse ultrapassado em muito

  14. Wind Transport of Radionuclide- Bearing Dust, Peña Blanca, Chihuahua, Mexico

    Science.gov (United States)

    Velarde, R.; Goodell, P. C.; Gill, T. E.; Arimoto, R.

    2007-05-01

    This investigation evaluates radionuclide fractionation during wind erosion of high-grade uranium ore storage piles at Peña Blanca (50km north of Chihuahua City), Chihuahua, Mexico. The aridity of the local environment promotes dust resuspension by high winds. Although active operations ceased in 1983, the Peña Blanca mining district is one of Mexico`s most important uranium ore reserves. The study site contains piles of high grade ore, left loose on the surface, and separated by the specific deposits from which they were derived (Margaritas, Nopal I, and Puerto I). Similar locations do not exist in the United States, since uranium mining sites in the USA have been reclaimed. The Peña Blanca site serves as an analog for the Yucca Mountain project. Dust deposition is collected at Peña Blanca with BSNE sediment catchers (Fryrear, 1986) and marble dust traps (Reheis, 1999). These devices capture windblown sediment; subsequently, the sample data will help quantify potentially radioactive short term field sediment loss from the repository surface and determine sediment flux. Aerosols and surface materials will be analyzed and radioactivity levels established utilizing techniques such as gamma spectroscopy. As a result, we will be able to estimate how much radionuclide contaminated dust is being transported or attached geochemically to fine grain soils or minerals (e.g., clays or iron oxides). The high-grade uranium-bearing material is at secular equilibrium, thus the entire decay series is present. Of resulting interest is not only the aeolian transport of uranium, but also of the other daughter products. These studies will improve our understanding of geochemical cycling of radionuclides with respect to sources, transport, and deposition. The results may also have important implications for the geosciences and homeland security, and potential applications to public health. Funding for this project is provided in part via a NSF grant to Arimoto.

  15. Soil-water retention curve and beginning of monitoring in Tierra Blanca Joven (TBJ)

    OpenAIRE

    Chávez, José A.; López, Reynaldo; Kopecky, Lubomir; Landaverde, José

    2011-01-01

    In El Salvador during the rainy season or when major earthquakes occur, the areas covered by the volcanic tephras Tierra Blanca Joven (TBJ) suffer mass movements, liquefaction and erosion; causing important en- vironmental, social and economic losses. To start the characterization of these unsaturated soils, suction values of a fall unit of TBJ were obtained using pressure plate, centrifuge and filter paper to build a Soil-Water Retention Curve. The use of this curve into finite elements soft...

  16. Siphoninus finitimus Silvestri (Hemiptera: Aleyrodidae), "mosquita blanca del olivo" en Arica-Chile

    OpenAIRE

    Bobadilla Guzman, Dante; Cerdá Hernández, Carolina; Salvatierra Martínez, Ricardo; Sepúlveda Chavera, Germán F.

    2014-01-01

    Se ent regan antecedentes sobr e las diferencias morfométricas en distintas estructuras de adultos y del pupoide de las poblaciones de aleyródidos asociados a olivo, peral y granado en la región de Arica- Parinacota, Chile. Las significativas diferencias (p < 0,01) encontradas en las dimensiones y en la morfología de las estructuras estudiadas entre las distintas poblaciones de mosquitas blancas que a...

  17. REGIONAL HYDROLOGY OF THE NOPAL I SITE, SIERRA DE PENA BLANCA, CHIHUAHUA, MEXICO

    International Nuclear Information System (INIS)

    Rodriguez-Pineda, J.A.; Goodell, P.; Dobson, P.F.; Walton, J.; Oliver, R.; De La Garza; Harder, S.

    2005-01-01

    The U.S. Department of Energy sponsored the drilling of three wells in 2003 near the Nopal I uranium deposit at the Sierra Pena Blanca, Chihuahua, Mexico. Piezometric information is being collected to understand groundwater flow at local and regional levels as part of an ongoing natural analogue study of radionuclide migration. Water level monitoring reported at these and other wells in the region is combined with archival data to provide a better understanding of the hydrology at Nopal I. Initial results suggest that the local hydrology is dependent on the regional hydrologic setting and that this groundwater system behaves as an unconfined aquifer. The region is dominated by an alternating sequence of highlands and basins that step down from west to east. The Sierra de Pena Blanca was downdropped from the cratonic block to the west during Cenozoic extension. The Nopal I area is near the intersection of two large listric faults, and the questa of ash flow tuffs that hosts the deposit has been subjected to complex structural events. The Pena Blanca Uranium District was originally characterized by 105 airborne radiometric anomalies, indicating widespread uranium mineralization. The Nopal I uranium deposit is located in the Sierra del Pena Blanca between the Encinillas Basin to the west, with a mean elevation of 1560 m, and the El Cuervo Basin to the east, with a mean elevation of 1230 m. The Nopal I + 10 level is at an intermediate elevation of 1463 m, with a corresponding groundwater elevation of approximately 1240 m. The regional potentiometric surface indicates flow from west to east, with the El Cuervo Basin being the discharge zone for the regional flow system. However, it appears that the local groundwater potential beneath the Nopal I site is more in accordance with the water table of the El Cuervo Basin than with that of the Encinillas Basin. This might indicate that there is limited groundwater flow between the Encinillas Basin and the Nopal I area

  18. REGIONAL HYDROLOGY OF THE NOPAL I SITE, SIERRA DE PENA BLANCA, CHIHUAHUA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    J.A. Rodriguez-Pineda; P. Goodell; P.F. Dobson; J. Walton; R. Oliver; De La Garza; S. Harder

    2005-07-11

    The U.S. Department of Energy sponsored the drilling of three wells in 2003 near the Nopal I uranium deposit at the Sierra Pena Blanca, Chihuahua, Mexico. Piezometric information is being collected to understand groundwater flow at local and regional levels as part of an ongoing natural analogue study of radionuclide migration. Water level monitoring reported at these and other wells in the region is combined with archival data to provide a better understanding of the hydrology at Nopal I. Initial results suggest that the local hydrology is dependent on the regional hydrologic setting and that this groundwater system behaves as an unconfined aquifer. The region is dominated by an alternating sequence of highlands and basins that step down from west to east. The Sierra de Pena Blanca was downdropped from the cratonic block to the west during Cenozoic extension. The Nopal I area is near the intersection of two large listric faults, and the questa of ash flow tuffs that hosts the deposit has been subjected to complex structural events. The Pena Blanca Uranium District was originally characterized by 105 airborne radiometric anomalies, indicating widespread uranium mineralization. The Nopal I uranium deposit is located in the Sierra del Pena Blanca between the Encinillas Basin to the west, with a mean elevation of 1560 m, and the El Cuervo Basin to the east, with a mean elevation of 1230 m. The Nopal I + 10 level is at an intermediate elevation of 1463 m, with a corresponding groundwater elevation of approximately 1240 m. The regional potentiometric surface indicates flow from west to east, with the El Cuervo Basin being the discharge zone for the regional flow system. However, it appears that the local groundwater potential beneath the Nopal I site is more in accordance with the water table of the El Cuervo Basin than with that of the Encinillas Basin. This might indicate that there is limited groundwater flow between the Encinillas Basin and the Nopal I area.

  19. Stress field evolution above the Peruvian flat-slab (Cordillera Blanca, northern Peru)

    Science.gov (United States)

    Margirier, A.; Audin, L.; Robert, X.; Pêcher, A.; Schwartz, S.

    2017-08-01

    In subduction settings, the tectonic regime of the overriding plate is closely related to the geometry of the subducting plate. Flat-slab segments are supposed to increase coupling at the plate interface in the Andes, resulting in an increase and eastward migration of the shortening in the overriding plate. Above the Peruvian flat-slab, a 200 km-long normal fault trend parallel to the range and delimits the western flank of the Cordillera Blanca. In a context of flat subduction, expected to produce shortening, the presence of the Cordillera Blanca normal fault (CBNF) is surprising. We performed a systematic inversion of striated fault planes in the Cordillera Blanca region to better characterize the stress field above the Peruvian flat-slab. It evidences the succession of different tectonic regimes. NE-SW extension is predominant in most of the sites indicating a regional extension. We suggest that the Peruvian flat-slab trigger extension in the Western Cordillera while the shortening migrated eastward. Finally, we propose that flat-slab segments do not increase the coupling at the trench neither the shortening in the overriding plate but only favor shortening migration backward. However, the stress field of the overriding plate arises from the evolution of plate interface properties through time due to bathymetric anomaly migration.

  20. Final report of the Peña Blanca natural analogue project

    Energy Technology Data Exchange (ETDEWEB)

    Levy, Schön S. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Goldstein, Steven Joel [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Abdel-Fattah, Amr I. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Amato, Ronald S. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Anthony, Elizabeth [Univ. of Texas, El Paso, TX (United States); Cook, Paul [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Dobson, Patrick F. [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Fayek, Mostafa [Univ. of Manitoba, Winnipeg (Canada); French, Diana [Univ. of Texas, El Paso, TX (United States); Garza, Rodrigo de [Univ. Autonoma de Chihuahua (Mexico); Ghezzehei, Teamrat [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Goodell, Philip C. [Univ. of Texas, El Paso, TX (United States); Harder, Steven H. [Univ. of Texas, El Paso, TX (United States); Ku, Teh-Lung [Univ. of Southern California, Los Angeles, CA (United States); Luo, Shangde [Univ. of Southern California, Los Angeles, CA (United States); Murrell, Michael Tildon [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Norman, Deborah E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Nunn, Andrew J. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oliver, Ronald [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Pekar-Carpenter, Katrina [Univ. of Texas, El Paso, TX (United States); Rearick, Michael Sean [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Ren, Minghua [Univ. of Texas, El Paso, TX (United States); Reyes-Cortes, Ignacio [Univ. Autonoma de Chihuahua (Mexico); Pineda, Jose Alfredo [El Instituto de Ecologia (INECOL) (Mexico); Saulnier, George [AREVA Federal Services LLC, Charlotte, NC (United States); Tarimala, Sowmitri [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Walton, John [Univ. of Texas, El Paso, TX (United States)

    2016-10-04

    The Peña Blanca region, 50 km north of Chihuahua City, Chihuahua, México, was a target of uranium exploration and mining by the Mexican government. After mining ceased in 1981, researchers became interested in this region as a study area for subsurface uranium migration with relevance to geologic disposal of nuclear waste. Many studies related to this concept were conducted at the Nopal I mine site located on a cuesta (hill) of the Sierra Peña Blanca. This site has geologic, tectonic, hydrologic, and geochemical similarities to Yucca Mountain, Nevada, a formerly proposed site for a high-level nuclear-waste repository in the unsaturated zone. The U.S. Department of Energy (U.S. DOE), Office of Civilian Radioactive Waste Management (OCRWM), sponsored studies at Nopal I in the 1990s and supported the drilling of three research wells – PB1, PB2, and PB3 – at the site in 2003. Beginning in 2004, the Peña Blanca Natural Analogue Project was undertaken by U.S. DOE, OCRWM to develop a three-dimensional conceptual model of the transport of uranium and its radiogenic daughter products at the Nopal I site.

  1. Role of erosion and isostasy in the Cordillera Blanca uplift: insights from Low-T thermochronology and landscape evolution modeling (northern Peru, Andes)

    Science.gov (United States)

    Margirier, A.; Robert, X.; Braun, J.; Laurence, A.

    2017-12-01

    The uplift and exhumation of the highest Peruvian peaks seems closely linked to the Cordillera Blanca normal fault that delimits and shape the western flank of the Cordillera Blanca. Two models have been previously proposed to explain the occurrence of extension and the presence of this active normal fault in a compression setting but the Cordillera Blanca normal fault and the uplift and exhumation of the Cordillera Blanca remain enigmatic. Recent studies suggested an increase of exhumation rates during the Quaternary in the Cordillera Blanca and related this increase to a change in climate and erosion process (glacial erosion vs. fluvial erosion). The Cordillera Blanca granite has been significantly eroded since its emplacement (12-5 Ma) indicating a significant mass of rocks removal. Whereas it has been demonstrated recently that the effect of eroding denser rocks can contribute to an increase of uplift rate, the impact of erosion and isostasy on the increase of the Cordillera Blanca uplift rates has never been explored. Based on numerical modeling of landscape evolution we address the role of erosion and isostasy in the uplift and exhumation of the Cordillera Blanca. We performed inversions of the present-day topography, total exhumation and thermochronological data using a landscape evolution model (FastScape). Our results evidence the contribution of erosion and associated flexural rebound to the uplift of the Cordillera Blanca. Our models suggest that the erosion of the Cordillera Blanca dense intrusion since 3 Ma could also explain the Quaternary exhumation rate increase in this area. Finally, our results allow to question the previous models proposed for the formation of the Cordillera Blanca normal fault.

  2. Hook selectivity of the pacu Piaractus mesopotamicus (Holmberg, 1887 in the Pantanal, the state of Mato Grosso do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    J. Peixer

    Full Text Available The Pacu Piaractus mesopotamicus is the most captured fish species in the Pantanal, Mato Grosso do Sul State, and since 1994, its maximum sustainable yield had already been exceeded. Its capture is carried out only by hooks, as mesh gears are forbidden either for professional or for recreational fishing. The aim of this study was to determine selectivity for different hook sizes used in P. mesopotamicus fishing and to verify which sizes capture only adults. Data were collected in the rivers Miranda, Aquidauana, and Vermelho, in January, March, and April 2002. Six longlines with eight hook sizes were used and we adopted the hook opening as a measure related to selectivity. Different hooks captured individuals of the same length and their medians were similar, evidencing the great overlap among sizes. Regression results showed no significant relationship between ln[c2 (l/c1 (l] and total length of captured individuals. In addition, the Kolmogorov-Smirnov test also did not detect significant differences in the size of captured fish. Several hypotheses, such as the selectivity models, shape of selection curves, scarcity of large fishes, and behavior are used in order to explain the absence of hook selectivity for this species. Size of recruitment for this gear was 28 cm of total length, when individuals are still immature.

  3. Evaluation of the haematological parameters in Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae with Argulus sp. (Crustacea, Branchiura infestation and treatment with organophosphate

    Directory of Open Access Journals (Sweden)

    Marcos Tavares-Dias

    1999-06-01

    Full Text Available Haematological parameters as erythrocytes, leukocytes and plasma glucose in Piaractus mesopotamicus Holmberg, 1887 were analyzed. Fish were parasitized with Argulus sp. (Crustacea, Branchiura and treated with 0.4 mg of thriclorphon 500/L water. The effects of parasitism and the action of the treatment were evaluated. Parasitized fish showed greater number of monocytes (P>0.05 and special granulocitic cells (P0.05. Organophosphate treatment presented significantly reduction (P>0.05 in red blood cells (RBC and hemoglobin.

  4. Casa, cuerpo. La poesía de Blanca Varela frente al espejo Casa, cuerpo. La poesía de Blanca Varela frente al espejo

    Directory of Open Access Journals (Sweden)

    Eduardo Lino Salvador

    2012-05-01

    Full Text Available La bibliografía crítica existente sobre Blanca Varela se ve enriquecida con un nuevo libro de Camilo Fernández Cozman que recibe por título  Casa, cuerpo. La poesía de Blanca Varela frente al espejo. Este libro, divido en cuatro capítulos, representa, sin duda, un serio acercamiento a diversos tópicos de la poesía vareliana. En este texto, el Miembro de Número de la Academia Peruana de la Lengua, fiel a su rigor interdisciplinario cuya base radica en la retórica general textual, inicia su investigación con un exhaustivo balance de la recepción crítica sobre la lírica de la poeta peruana. En el capítulo que inicia el libro, examina los artículos y ensayos más representativos destacando las ideas de Octavio Paz, las sugerentes reflexiones de José Miguel Oviedo, los disímiles puntos de vista existentes entre Roberto Paoli y David Sobrevilla que buscaban comprender la propuesta del verso de la poeta de  Ese puerto existe. El crítico destaca, también, los importantes aportes de Rocío Silva-Santisteban y Bethsabé Huamán que, desde la perspectiva de los estudios de género, abren el camino para nuevas claves de lectura. Asimismo, examina la mirada que la historiografía literaria tiene sobre la poeta; así como también los criterios a partir de los cuales se posibilitó su presencia en distintas antologías.

  5. Seasonal changes in reproductive activity, sperm variables and sperm freezability in Blanca Andaluza bucks

    Energy Technology Data Exchange (ETDEWEB)

    Gallego-Calvo, L.; Gatica, M.C.; Santiago-Moreno, J.; Guzmán, J.L.; Zarazaga, L.

    2015-07-01

    Interest in the preservation of endangered breeds such as the Blanca Andaluza goat, has increased and some steps should be therefore taken to ensure it. The study was designed to determine the seasonal reproductive pattern of Blanca Andaluza bucks, and whether this affects the quality of their semen and its freezability over the year. Seven bucks were used and their body weight, testicular weight, plasma testosterone concentration and fresh sperm quality determined every week. The collected sperm was cryopreserved and stored; it was then thawed and the same sperm quality variables measured every fortnight. High plasma testosterone concentrations were recorded during the summer and autumn, and low concentrations were recorded during winter and spring (p<0.001). No differences were seen between seasons in terms of the percentage of bucks ejaculating, the percentage of active bucks, or ejaculate volume. However, the sperm concentration, the total number of sperm per ejaculate, and the values for most fresh sperm variables were lower during the winter period (at least p<0.05). After freezing-thawing, the quality of winter-collected sperm was better, in some respects, than that of summer-collected sperm (at least p<0.05). These results reveal that Blanca Andaluza bucks show seasonal reproductive activity in terms of their plasma testosterone concentration, but no clear change in their sexual behaviour between seasons was observed. The values of fresh sperm variables also vary over the year, reaching their lowest during winter. However, after freezing-thawing, winter-collected sperm is of overall better quality than sperm collected during the summer. (Author)

  6. Seasonal changes in reproductive activity, sperm variables and sperm freezability in Blanca Andaluza bucks

    Directory of Open Access Journals (Sweden)

    Lourdes Gallego-Calvo

    2015-12-01

    Full Text Available Interest in the preservation of endangered breeds such as the Blanca Andaluza goat, has increased and some steps should be therefore taken to ensure it. The study was designed to determine the seasonal reproductive pattern of Blanca Andaluza bucks, and whether this affects the quality of their semen and its freezability over the year. Seven bucks were used and their body weight, testicular weight, plasma testosterone concentration and fresh sperm quality determined every week. The collected sperm was cryopreserved and stored; it was then thawed and the same sperm quality variables measured every fortnight. High plasma testosterone concentrations were recorded during the summer and autumn, and low concentrations were recorded during winter and spring (p<0.001. No differences were seen between seasons in terms of the percentage of bucks ejaculating, the percentage of active bucks, or ejaculate volume. However, the sperm concentration, the total number of sperm per ejaculate, and the values for most fresh sperm variables were lower during the winter period (at least p<0.05. After freezing-thawing, the quality of winter-collected sperm was better, in some respects, than that of summer-collected sperm (at least p<0.05. These results reveal that Blanca Andaluza bucks show seasonal reproductive activity in terms of their plasma testosterone concentration, but no clear change in their sexual behaviour between seasons was observed. The values of fresh sperm variables also vary over the year, reaching their lowest during winter. However, after freezing-thawing, winter-collected sperm is of overall better quality than sperm collected during the summer.

  7. NSR&D FY17 Report: CartaBlanca Capability Enhancements

    Energy Technology Data Exchange (ETDEWEB)

    Long, Christopher Curtis [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dhakal, Tilak Raj [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Zhang, Duan Zhong [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-10-19

    Over the last several years, particle technology in the CartaBlanca code has been matured and has been successfully applied to a wide variety of physical problems. It has been shown that the particle methods, especially Los Alamos's dual domain material point method, is capable of computing many problems involves complex physics, chemistries accompanied by large material deformations, where the traditional finite element or Eulerian method encounter significant difficulties. In FY17, the CartaBlanca code has been enhanced with physical models and numerical algorithms. We started out to compute penetration and HE safety problems. Most of the year we focused on the TEPLA model improvement testing against the sweeping wave experiment by Gray et al., because it was found that pore growth and material failure are essentially important for our tasks and needed to be understood for modeling the penetration and the can experiments efficiently. We extended the TEPLA mode from the point view of ensemble phase average to include the effects of nite deformation. It is shown that the assumed pore growth model in TEPLA is actually an exact result from the theory. Alone this line, we then generalized the model to include finite deformations to consider nonlinear dynamics of large deformation. The interaction between the HE product gas and the solid metal is based on the multi-velocity formation. Our preliminary numerical results suggest good agreement between the experiment and the numerical results, pending further verification. To improve the parallel processing capabilities of the CartaBlanca code, we are actively working with the Next Generation Code (NGC) project to rewrite selected packages using C++. This work is expected to continue in the following years. This effort also makes the particle technology developed with CartaBlanca project available to other part of the laboratory. Working with the NGC project and rewriting some parts of the code also given us an

  8. FENOLOGÍA DE LA ALBAHACA BLANCA (Ocimum basilicum L.) CULTIVADA EN DIFERENTES FECHAS DE SIEMBRA

    OpenAIRE

    L. Barroso; E. Jerez

    2002-01-01

    El presente trabajo se desarrolló en el Instituto Nacional de Ciencias Agrícolas (INCA), con el objetivo de estudiar la fenología de la albahaca blanca (Ocimum basilicum L.) en diferentes fechas de siembra. Para ello las semillas se sembraron en enero y abril en recipientes de seis litros, con un sustrato de suelo Ferralítico Rojo compactado y materia orgánica del tipo cachaza, en una relación 3:1 v/v. Del análisis de las observaciones se obtuvo que, entre las fechas estudiadas, se alcanzan d...

  9. Sobrepoblación de venado cola blanca en el noreste de México

    OpenAIRE

    Martínez M., Alfonso; Hewitt, David

    2001-01-01

    Debido a que la cacería de hembras de venado cola blanca texano (Odocoileus virginianus texanus) era ilegal en México, las poblaciones de venado en algunos ranchos de la región fronteriza del noreste del país, alcanzan densidades muy altas por lo que la condición nutricional de los animales y la calidad del hábitat puede verse afectada. En el presente estudio se determinó el estatus nutricional de 350 hembras capturadas en el noreste de México entre febrero y marzo ...

  10. Conducta simbolica en la rata blanca: Simulación del aprendizaje de palabras

    OpenAIRE

    Veà, Joaquim

    1986-01-01

    Partiendo de un principio de continuidad evolutiva en los mecanismos y estructura de la función simbólica en el reino animal, se implanta el equivalente funcional de una palabra (Tact) en la rata blanca. Siguiendo a la mayor parte de los trabajos de implantación de lenguaje artificial en animales, se utilizan las técnicas de condicionamientc operante con una primera fase de aprendizaje, para dejar al sujeto una libre utilización de la relación funcional simbólica en la segunda fase (inversión...

  11. El expendio de hierbas medicinales en el partido de Bahía Blanca, Argentina

    OpenAIRE

    Cambi, Viviana; Hermann, Paula

    2001-01-01

    Se ha realizado una encuesta sobre el expendio de plantas medicinales en el partido de Bahía Blanca. En la mayoría de los comercios sólo del 10 al 30% de los clientes adquieren hierbas medicinales. Son más de 70 las especies vendidas: tilo (84,2% de los casos), manzanilla (74,3%), sen (69,3%), boldo (64,4%), cuasia, malva (47%), carqueja, valeriana (30%), cedrón (26,7%), ambay, cola de caballo y fucus (20%) son las más vendidas. En una gran proporción los clientes solicitan asesoramiento. Cas...

  12. Inoculación in vitro de la roya blanca (Puccinia horiana Hennings) en crisantemo (Dendranthema grandiflora Tzvelev)

    OpenAIRE

    Vences-Contreras, César; Vázquez García, Luis Miguel

    2006-01-01

    Inoculación in vitro de la roya blanca (Puccinia horiana Hennings) en crisantemo (Dendranthema grandiflora Tzvelev). El presente estudio tuvo como finalidad el desarrollar la técnica de inoculación in vitro de la roya blanca, con el objeto de ahorrar tiempo y espacio en la caracterización de los distintos cultivares de crisantemo respecto al grado de susceptibilidad o resistencia a este patógeno. En Tenancingo, Estado de México, en el periodo 2004-2005 se colectaron hojas de crisantemo que pr...

  13. Population genetic structuring in pacu (Piaractus mesopotamicus across the Paraná-Paraguay basin: evidence from microsatellites

    Directory of Open Access Journals (Sweden)

    Daniela Calcagnotto

    Full Text Available The Paraná-Paraguay basin encompasses central western Brazil, northeastern Paraguay, eastern Bolivia and northern Argentina. The Pantanal is a flooded plain with marked dry and rainy seasons that, due to its soil characteristics and low declivity, has a great water holding capacity supporting abundant fish fauna. Piaractus mesopotamicus, or pacu, endemic of the Paraná-Paraguay basin, is a migratory species economically important in fisheries and ecologically as a potential seed disperser. In this paper we employ eight microsatellite loci to assess the population structure of 120 pacu sampled inside and outside the Pantanal of Mato Grosso. Our main objective was to test the null hypothesis of panmixia and to verify if there was a different structuring pattern between the Pantanal were there were no physical barriers to fish movement and the heavily impounded Paraná and Paranapanema rivers. All loci had moderate to high levels of polymorphism, the number of alleles varied from three to 18. The average observed heterozygosity varied from 0.068 to 0.911. After the Bonferroni correction three loci remained significant for deviations from Hardy-Weinberg, and for those the frequency of null alleles was estimated. F ST and R ST pairwise comparisons detected low divergence among sampling sites, and differentiation was significant only between Paranapanema and Cuiabá and Paranapanema and Taquari. No correlation between genetic distance and the natural logarithm of the geographic distance was detected. Results indicate that for conservation purposes and for restoration programs small genetic differences detected in the Cuiabá and Paranapanema rivers should be taken in consideration.

  14. Quantitative expression of myogenic regulatory factors MyoD and myogenin in pacu (Piaractus mesopotamicus) skeletal muscle during growth.

    Science.gov (United States)

    de Almeida, Fernanda Losi Alves; Pessotti, Nabila Scabine; Pinhal, Danillo; Padovani, Carlos Roberto; Leitão, Natália de Jesus; Carvalho, Robson Francisco; Martins, Cesar; Portella, Maria Célia; Dal Pai-Silva, Maeli

    2010-12-01

    Skeletal muscle growth is regulated by differential expression of myogenic regulatory factors (MRFs). We evaluated hyperplasia, hypertrophy and quantitative expression of MRFs MyoD and myogenin in 45, 90, 180, and 400 days post-hatching (dph) and adult pacu (Piaractus mesopotamicus) skeletal muscle. Transverse sections of white dorsal muscles were obtained to evaluate hypertrophy and hyperplasia. MyoD and myogenin gene expression was determined by reverse transcription quantitative real-time polymerase chain reaction (RT-qPCR). Pacu skeletal muscle had similar morphology at all stages. The highest and the lowest frequencies of fiber diameters 50 μm diameter fibers were found in 180 and 400 dph, and adult fish. Hyperplasia was the main mechanism observed in pacu skeletal muscle growth at 45dph; this declined through 90, 180, and 400 dph and remained low in adult fish; the latter presented hypertrophy as the main mechanism responsible for skeletal muscle growth. The high frequencies of 20-50 μm diameter fibers at 90, 180, and 400 dph can be related to intense hypertrophy. The mRNA levels for MyoD and myogenin were similar in 45, 90, and 400 dph and adult fish, peaking at 180 dph. The high MyoD expression at 180 dph can be related to intense myoblast proliferation and hyperplasia, while high myogenin expression can be related to intense myoblast differentiation and fusion during hypertrophy. MyoD and myogenin expression patterns in adults can respectively be associated with myoblast proliferation and differentiation, which both contribute to hypertrophy. Differential MyoD and myogenin expression in pacu white muscle probably is associated with differences in growth patterns during the stages analyzed. In this study, the 180 dph pacu could represent an interesting phase to investigate suitable strategies in commercial fish production focusing on skeletal muscle growth improvement to raise healthy, fast-growing fish. Copyright © 2010 Elsevier Ltd. All rights reserved.

  15. Eficácia do florfenicol e da oxitetraciclina no controle de Aeromonas hydrophila em pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    S.P. Carraschi

    2011-06-01

    Full Text Available Determinou-se a concentração eficaz de oxitetraciclina (OTC e florfenicol (FFC no tratamento de Aeromonas hydrophila em pacu (Piaractus. mesopotamicus. Os pacus foram submetidos à captura duas vezes ao dia por quatro dias e em seguida foram infectados com A. hydrophila (2,4x10(7 bactéria mL-1. Os tratamentos utilizados foram: controle sem infecção (CSI, controle com infecção (CCI e tratados com 110,0; 140,0 e 170,0mgOTC.kg-1, e 5,0; 10,0 e 15,0mgFFC.kg-1. As variáveis de qualidade da água foram monitoradas diariamente. Após o tratamento, no CSI dos dois testes, ocorreu 100% de sobrevivência. Nos testes com OTC, no CCI, a sobrevivência foi de 29,2%; em 110,0mg.kg-1, 37,5%; em 140,0mg.kg-1, 29,2%; e em 170,0mg.kg-1, 50,0%. Nos testes com FFC, foi eficaz com 10,0mg.kg-1, e no CCI a sobrevivência foi de 76,9%; em 5,0mg.kg-1, 81,81%; em 10,0mg/L.kg-1, 100% e em 15,0mg.kg-1, 87,5%. A OTC, em concentrações de até 170,0mg.kg-1 de ração, não é eficaz para o controle de A. hydrophila em pacu, e o FFC é eficaz na concentração de 10,0mg.kg-1 e ambos não alteram as variáveis de qualidade de água.

  16. Aging and growth parameter from the Piaractus mesopotamicus (pacu from the Cuiabá river, Mato Grosso, Brazil

    Directory of Open Access Journals (Sweden)

    Angela M. Ambrosio

    2014-12-01

    Full Text Available This study has aims to determine the age and to estimate the growth parameters using scales of the species. Individuals of Piaractus mesopotamicus (Holmberg, 1887 used in this study were captured in the commercial fishery conducted in the region, along the year 2006. The model selected to express the growth of the species was the von Bertalanffy Sl= Sl∞*[1-exp-k(t-to]. To determine if scales are suitable for studying the growth of pacu, we analyzed the relation between standard length (Sl and the radius of the scales through linear regression. The period of annuli formation was determined analyzing the variations in the marginal increment and evaluating the consistency of the readings through the analysis of the coefficient of variations (CVs for the average standard lengths of each age (number of rings observed in the scales. The relationship between Ls of the fish and the radius of the scales showed that scales can be used to study the age and growth of P. mesopotamicus (R= 0.79. CVs were always below 20%, demonstrating the consistency of the readings. Annuli formation occurred in February, probably related to trophic migration that occurs in this month in the region. Equations that represents the growth in length obtained for P. mesopotamicus are Sl=50.00*[1-exp-0.18(t-(-3.00] for males and Sl=59.23*[1-exp-0.14(t-(-3.36] for females. The growth parameters obtained in this study were lower compared to other studies previously conducted for the same species and can related to overexploitation that species is submitted by fishing in the region. These values show also that females of pacu attain greater asymptotic length than males that growth faster.

  17. Sistema perceptivo cotidiano de los adolescentes de la ciudad de Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    Rubio Farinelli María Laura

    2009-10-01

    Full Text Available Este artículo pretende ofrecer una metodología para planificar los espacios urbanos, a través del reconocimiento de las imágenes percibidas por diferentes actores. El objetivo es comprender el sistema perceptivo de referencia local de los adolescentes de Bahía Blanca, a partir de sus prácticas socioespaciales y de sus vínculos con familiares y amigos, como medios para definir y categorizar los lugares de mayor concurrencia habitual que, por su significado emocional, se convierten en geosímbolos de referencia colectiva. El método utilizado se fundamenta en datos cuali-cuantitativos para elaborar cartografía de abstracción subjetiva, que posteriormente será utilizada para orientar la intervención urbana bajo conceptos de estética y funcionalidad. Se espera contribuir al reconocimiento de los sectores que más agradan a los jóvenes en aras de la redefinición del diseño de las zonas urbanas de Bahía Blanca.

  18. Major QTLs Control Resistance to Rice Hoja Blanca Virus and Its Vector Tagosodes orizicolus

    Science.gov (United States)

    Romero, Luz E.; Lozano, Ivan; Garavito, Andrea; Carabali, Silvio J.; Triana, Monica; Villareal, Natalia; Reyes, Luis; Duque, Myriam C.; Martinez, César P.; Calvert, Lee; Lorieux, Mathias

    2013-01-01

    Rice hoja blanca (white leaf) disease can cause severe yield losses in rice in the Americas. The disease is caused by the rice hoja blanca virus (RHBV), which is transmitted by the planthopper vector Tagosodes orizicolus. Because classical breeding schemes for this disease rely on expensive, time-consuming screenings, there is a need for alternatives such as marker-aided selection. The varieties Fedearroz 2000 and Fedearroz 50, which are resistant to RHBV and to the feeding damage caused by T. orizicolus, were crossed with the susceptible line WC366 to produce segregating F2:3 populations. The F3 families were scored for their resistance level to RHBV and T. orizicolus. The F2:3 lines of both crosses were genotyped using microsatellite markers. One major QTL on the short arm of chromosome 4 was identified for resistance to RHBV in the two populations. Two major QTL on chromosomes 5 and 7 were identified for resistance to T. orizicolus in the Fd2000 × WC366 and Fd50 × WC366 crosses, respectively. This comparative study using two distinct rice populations allowed for a better understanding of how the resistance to RHBV and its vector are controlled genetically. Simple marker-aided breeding schemes based on QTL information can be designed to improve rice germplasm to reduce losses caused by this important disease. PMID:24240781

  19. Geomorphologically effective floods from moraine-dammed lakes in the Cordillera Blanca, Peru

    Science.gov (United States)

    Emmer, Adam

    2017-12-01

    Outburst floods originating in moraine-dammed lakes represent a significant geomorphological process as well as a specific type of threat for local communities in the Cordillera Blanca, Peru (8.5°-10° S; 77°-78° W). An exceptional concentration of catastrophic floods has been reported from the Cordillera Blanca in the first half of 20th Century (1930s-1950s), leading to thousands of fatalities. The main objective of this paper is to provide a revised and comprehensive overview of geomorphologically effective floods in the area of interest, using various documentary data sources, verified by analysis of remotely sensed images (1948-2013) and enhanced by original field data. Verified events (n = 28; 4 not mentioned before) are analysed from the perspective of spatiotemporal distribution, pre-flood conditions, causes, mechanisms and geomorphological impacts as well as socioeconomical consequences, revealing certain patterns and similar features. GLOFs are further classified according to their magnitude: 5 extreme events, 8 major events and 15 minor events are distinguished, referring to the quantified geomorphological and socioeconomical impacts. Selected moraine dams and flood deposits are dated using lichenometric dating. Special attention is given to moraine dam breaches - the most frequent type of water release with the most significant consequences. Selected major events and their consequences are studied in detail in a separate section. Finally, a general schematic model of lake formation, growth and post-flood evolution reflecting initial topographical setting and glacier retreat is introduced and the utilization of the obtained results is outlined.

  20. Capacidad reguladora de Chrysoperla externa (Hagen sobre mosca blanca Trialeurodes vaporariorum (Westwood en tomate bajo invernadero

    Directory of Open Access Journals (Sweden)

    Mayerly Alejandra Castro-Lopez

    2016-11-01

    Full Text Available Trialeurodes vaporariorum Westwood (Hemíptera: Aleyrodidae es uno de los principales limitantes del cultivo de tomate Solanum lycopersicum, por generar problemas directos e indirectos en este sistema de producción; para el manejo de este insecto (mosca blanca se acude a excesivas aplicaciones de productos de síntesis química, sin obtener los mejores resultados. Este estudio consistió en evaluar, en condiciones de invernadero, la capacidad reguladora de Chrysoperla externa Hagen (Neuróptera: Chrysopidae sobre la mosca blanca presente en tomate. En plantas infestadas con individuos de T. vaporariorum se adicionó C. externa en niveles poblacionales de 80, 160 y 240 individuos en estado larval por planta, y se contó con un testigo sin depredador. Se empleó un diseño completamente al azar en condiciones de invernadero (temperatura promedio de 20 ºC y humedad relativa del 60 %. Se observaron diferencias estadísticamente significativas entre las densidades del depredador, con infestaciones de 35, 52 y 53 % de T. vaporariorum (tras cuatro semanas, correspondientes a las liberaciones de 240, 160 y 80 individuos por planta, respectivamente. Se observó que las plantas del testigo presentaron menor altura y número de ramas, respecto de los tratamientos en los cuales había presencia del depredador C. externa.

  1. Slab flattening, dynamic topography and normal faulting in the Cordillera Blanca region (northern Peru)

    Science.gov (United States)

    Margirier, A.; Robert, X.; Laurence, A.; Gautheron, C.; Bernet, M.; Simon-Labric, T.; Hall, S. R.

    2015-12-01

    Processes driving surface uplift in the Andes are still debated and the role of subduction processes as slab flattening on surface uplift and relief building in the Andes is not well understood. Some of the highest Andean summits, the Cordillera Blanca (6768 m) and the Cordillera Negra (5187 m), are located above a present flat subduction zone (3-15°S), in northern Peru. In this area, both the geometry and timing of the flattening of the slab are well constrained (Gutscher et al., 1999; Rosenbaum et al., 2005). This region is thus a perfect target to explore the effect of slab flattening on the Andean topography and uplift. We obtained new apatite (U-Th)/He and fission-track ages from three vertical profiles located in the Cordillera Blanca and the Cordillera Negra. Time-temperature paths obtained from inverse modeling of the thermochronological data indicates a Middle Miocene cooling for both Cordillera Negra profiles. We interpret it as regional exhumation in the Cordillera Occidental starting in Middle Miocene, synchronous with the onset of the subduction of the Nazca ridge (Rosenbaum et al., 2005). We propose that the Nazca ridge subduction at 15 Ma and onset of slab flattening in northern Peru drove regional positive dynamic topography and thus enhanced exhumation in the Cordillera Occidental. This study provides new evidence of the impact subduction processes and associated dynamic topography on paleogeography and surface uplift in the Andes.

  2. Landslide and glacial lake outburst flood hazard in the Chucchún river basin, Cordillera Blanca, Peru

    Czech Academy of Sciences Publication Activity Database

    Klimeš, Jan; Vilímek, V.; Benešová, M.

    2015-01-01

    Roč. 50, č. 2 (2015), s. 173-180 ISSN 0300-5402 R&D Projects: GA ČR(CZ) GAP209/11/1000 Institutional support: RVO:67985891 Keywords : landslide hazard * GLOFs * flood hazard * Cordillera Blanca * Peru Subject RIV: DE - Earth Magnetism, Geodesy, Geography

  3. Grain size distribution of soils within the Cordillera Blanca, Peru: An indicator of basic mechanical properties for slope stability evaluation

    Czech Academy of Sciences Publication Activity Database

    Novotný, J.; Klimeš, Jan

    2014-01-01

    Roč. 11, č. 3 (2014), s. 563-577 ISSN 1672-6316 R&D Projects: GA ČR(CZ) GAP209/11/1000 Institutional support: RVO:67985891 Keywords : moraines * grain size distribution * shear strength * hydraulic conductivity * Cordillera Blanca Subject RIV: DE - Earth Magnetism, Geodesy, Geography Impact factor: 0.963, year: 2014

  4. Lipophilic antioxidant activity of guava fruit varieties Palmira ICA I, Regional Roja and Regional Blanca in four ripening stages

    Directory of Open Access Journals (Sweden)

    Mauricio Espinal R

    2012-08-01

    Full Text Available We determined the lipophilic antioxidant activity and β-carotene content with HPLC-UV in guava fruit Psidium guajava L. varieties Palmira ICA I, Regional Roja and Regional Blanca in the ripening stages: green, semi-ripe, mature and senescent. It was established that the β-carotene content and lipophilic antioxidant activity increased during the ripening process up to the climacteric maximum and decreased during senescence; lipophilic antioxidant activity being higher in the varieties Palmira ICA I (13.06 μmol α-tocoferol/g fruit and regional roja (14.08 μmol a-tocopherol/g fruit and lower in the regional blanca variety (7.04 μmol a-tocopherol/g fruit, while β-carotene content was highest in the regional roja variety (85.26 Eq. retinol/100 g fruit followed by the varieties Palmira ICA I (10.53 Eq. retinol/100 g fruit and regional blanca (5.78 Eq. retinol/100 g fruit. The best correlation between lipophilic antioxidant activity and β-carotene content was observed in the ‘regional roja’ (r² = 0.830, while the varieties Palmira ICA I and regional blanca showed no correlation

  5. Diferentes niveles de energía metabolizable y aminoácidos azufrados en dietas para gallinas Bovans blancas

    OpenAIRE

    María de los Ángeles Tepox Pérez; Benjamín Fuente Martínez; Tomás Jínez Méndez; Ernesto Ávila González

    2012-01-01

    Con el objeto de evaluar el comportamiento productivo de la gallina Bovans blanca de primer ciclo alimentadas con dietas con niveles diferentes de energía metabolizable (EM) y de metionina+cistina digestible (AAD), para lograr disminuir el porcentaje de huevo pequeño (

  6. Pobreza por Ingresos en Argentina y Bahía Blanca: Estimaciones de referencia y cuestiones metodológicas

    Directory of Open Access Journals (Sweden)

    María Emma Santos

    2016-11-01

    Full Text Available En este trabajo se estima la indigencia y pobreza por ingresos en 2014 y 2015 para el total de aglomerados urbanos de Argentina y para el caso particular de Bahía Blanca, una ciudad intermedia, eminentemente industrial y comercial, con altos niveles de desempleo e indigencia recientes. Se encuentra que a mediados de 2015 una de cada diez personas estaba en situación de indigencia y casi tres de cada diez estaba en situación de pobreza, lo cual equivale a 11.6 millones de personas aproximadamente. En el caso del aglomerado de Bahía Blanca, una de cada 20 personas era indigente, y el 18% era pobre, lo cual se traduce en 15 mil y 54 mil personas en situación de indigencia y pobreza. El trabajo también expone algunos puntos críticos de la metodología de medición de pobreza por ingresos que requieren reflexión y mejoramiento en el proceso de restitución de las estadísticas oficiales de pobreza.Palabras clave: pobreza, indigencia, Argentina, Bahía Blanca.Código JEL: I32. Income Poverty in Argentina and Bahía Blanca: Reference estimates and methodological issuesAbstractIn this paper we estimate the indigence and poverty by income in 2014 and 2015 for the total urban agglomerations of Argentina and for the particular case of Bahía Blanca, an intermediate city, eminently industrial and commercial, with high levels of recent unemployment and indigence. It is found that by the middle of 2015 one in ten people was in a situation of indigence and almost three out of ten were in poverty, which is equivalent to approximately 11.6 million people. In the case of the Bahía Blanca agglomerate, one in 20 people were indigent, and 18% were poor, which translates into 15,000 and 54,000 people living in extreme poverty and poverty. The paper also presents some critical points of the methodology for measuring poverty by income that require reflection and improvement in the process of restitution of official poverty statistics.Keywords: poverty

  7. Differential microRNA Expression in Fast- and Slow-Twitch Skeletal Muscle of Piaractus mesopotamicus during Growth.

    Science.gov (United States)

    Duran, Bruno Oliveira da Silva; Fernandez, Geysson Javier; Mareco, Edson Assunção; Moraes, Leonardo Nazario; Salomão, Rondinelle Artur Simões; Gutierrez de Paula, Tassiana; Santos, Vander Bruno; Carvalho, Robson Francisco; Dal-Pai-Silva, Maeli; Dal-Pai-Silvca, Maeli

    2015-01-01

    Pacu (Piaractus mesopotamicus) is a Brazilian fish with a high economic value in pisciculture due to its rusticity and fast growth. Postnatal growth of skeletal muscle in fish occurs by hyperplasia and/or hypertrophy, processes that are dependent on the proliferation and differentiation of myoblasts. A class of small noncoding RNAs, known as microRNAs (miRNAs), represses the expression of target mRNAs, and many studies have demonstrated that miR-1, miR-133, miR-206 and miR-499 regulate different processes in skeletal muscle through the mRNA silencing of hdac4 (histone deacetylase 4), srf (serum response factor), pax7 (paired box 7) and sox6 ((sex determining region Y)-box 6), respectively. The aim of our work was to evaluate the expression of these miRNAs and their putative target mRNAs in fast- and slow-twitch skeletal muscle of pacu during growth. We used pacus in three different development stages: larval (aged 30 days), juvenile (aged 90 days and 150 days) and adult (aged 2 years). To complement our study, we also performed a pacu myoblast cell culture, which allowed us to investigate miRNA expression in the progression from myoblast proliferation to differentiation. Our results revealed an inverse correlation between the expression of the miRNAs and their target mRNAs, and there was evidence that miR-1 and miR-206 may regulate the differentiation of myoblasts, whereas miR-133 may regulate the proliferation of these cells. miR-499 was highly expressed in slow-twitch muscle, which suggests its involvement in the specification of the slow phenotype in muscle fibers. The expression of these miRNAs exhibited variations between different development stages and between distinct muscle twitch phenotypes. This work provides the first identification of miRNA expression profiles in pacu skeletal muscle and suggests an important role of these molecules in muscle growth and in the maintenance of the muscle phenotype.

  8. U-Series Transport Studies at the Pena Blanca, Mexico Natural Analog Site

    Energy Technology Data Exchange (ETDEWEB)

    A. M. Simmons; M. T. Murrell

    2001-05-31

    Natural analogs provide a line of evidence that supports the understanding of how natural and engineered processes would occur over long time frames and large spatial scales at a potential nuclear waste repository at Yucca Mountain, Nevada. Studies of U-series disequilibria within and around uranium deposits can provide valuable information on the timing of actinide mobility and hence the stability of a potential repository over geologic time scales. The Nopal I uranium deposit at Pena Blanca, Mexico, is situated in unsaturated tuff that is similar in composition to the Topopah Spring Tuff of Yucca Mountain and closely matches other evaluation criteria for suitable natural analogs. By modeling the observed radioactive isotope disequilibria at Nopal I, we can estimate the rates of sorption-desorption and dissolution-precipitation of the radionuclides over time. Such information is vital to the testing or validation of performance assessment models for geologic nuclear waste disposal.

  9. CASOS SELECTOS DE RESISTENCIA A INSECTICIDAS EN MOSCAS BLANCAS (Hemiptera: Aleyrodidae) EN EL MUNDO

    OpenAIRE

    Macías-flores A; Santillán-Ortega C; Robles-Bermúdez A; Ortiz-Catón M; Cambero-Campos OJ

    2013-01-01

    Las moscas blancas (Hemíptera: Aleyrodidae) son un problema a escala global. En México, llamó la atención como plaga agrícola en la década de los años 80´s y 90´s del siglo pasado por las pérdidas económicas que ocasionaron en los cultivos agrícolas, debido a los daños directos por la succión de savia y a los daños indirectos por la transmisión de enfermedades de origen viral. El hombre en su intento fallido por erradicarlas ha hecho uso desmedido de insecticidas químicos, quizás por su acc...

  10. [Drunk driving in professional drivers in the Vía Blanca highway in Cuba].

    Science.gov (United States)

    Guanche Garcell, Humberto; Suárez Enríquez, Tomás; Gutiérrez García, Francisco; Martínez Quesada, Carlos; Mendoza Pérez, Ramón

    2006-01-01

    To determine the frequency of drunk driving in professional drivers (Via Blanca, Havana City), we carried out a descriptive study of 832 drivers selected by multistage stratified sampling. A structured interview with each driver was carried out to record the variables under study, and a breath alcohol test was subsequently performed. The frequency of drunk driving was 8.18% (95% CI, 5.94%-10.42%), with a predominance of drivers with alcohol levelsDrunk driving was more frequent in "high risk" hours, in drivers aged between 40 and 49 years old (10.3%), and in those with 15 to 24 years of experience (11.02%). The frequency of drunk driving found in this study highlights the need to design traffic accident prevention strategies.

  11. Measurements of light absorbing particulates on the glaciers in the Cordillera Blanca, Peru

    Science.gov (United States)

    Schmitt, C. G.; All, J. D.; Schwarz, J. P.; Arnott, W. P.; Cole, R. J.; Lapham, E.; Celestian, A.

    2014-10-01

    Glaciers in the tropical Andes have been rapidly losing mass since the 1970s. In addition to the documented increase in air temperature, increases in light absorbing particulates deposited on glaciers could be contributing to the observed glacier loss. Here we report on measurements of light absorbing particulates sampled from glaciers during three surveys in the Cordillera Blanca in Peru. During three research expeditions in the dry seasons (May-August) of 2011, 2012 and 2013, two hundred and forty snow samples were collected from fifteen mountain peaks over altitudes ranging from 4800 to nearly 6800 m. Several mountains were sampled each of the three expeditions and some mountains were sampled multiple times during the same expedition. Collected snow samples were melted and filtered in the field then later analyzed using the Light Absorption Heating Method (LAHM), a new technique that measures the ability of particulates on filters to absorb visible light. LAHM results have been calibrated using filters with known amounts of fullerene soot, a common industrial surrogate for black carbon (BC). As sample filters often contain dust in addition to BC, results are presented in terms of effective Black Carbon (eBC). During the 2013 survey, snow samples were collected and kept frozen for analysis with a Single Particle Soot Photometer (SP2). Calculated eBC mass from the filter analysis and the SP2 refractory Black Carbon (rBC) results were well correlated (r2 = 0.92). These results indicate that a substantial portion of the light absorbing particulates in the more polluted areas were likely BC. The three years of data show that glaciers in the Cordillera Blanca Mountains close to human population centers have substantially higher levels of eBC (as high as 70 ng g-1) than remote glaciers (as low as 2.0 ng g-1 eBC), indicating that population centers can influence local glaciers by sourcing BC.

  12. Measurements of light-absorbing particles on the glaciers in the Cordillera Blanca, Peru

    Science.gov (United States)

    Schmitt, C. G.; All, J. D.; Schwarz, J. P.; Arnott, W. P.; Cole, R. J.; Lapham, E.; Celestian, A.

    2015-02-01

    Glaciers in the tropical Andes have been rapidly losing mass since the 1970s. In addition to the documented increase in temperature, increases in light-absorbing particles deposited on glaciers could be contributing to the observed glacier loss. Here we report on measurements of light-absorbing particles sampled from glaciers during three surveys in the Cordillera Blanca Mountains in Peru. During three research expeditions in the dry seasons (May-August) of 2011, 2012 and 2013, 240 snow samples were collected from 15 mountain peaks over altitudes ranging from 4800 to nearly 6800 m. Several mountains were sampled each of the 3 years and some mountains were sampled multiple times during the same year. Collected snow samples were melted and filtered in the field then later analyzed using the Light Absorption Heating Method (LAHM), a new technique that measures the ability of particles on filters to absorb visible light. LAHM results have been calibrated using filters with known amounts of fullerene soot, a common industrial surrogate for black carbon (BC). As sample filters often contain dust in addition to BC, results are presented in terms of effective black carbon (eBC). During the 2013 survey, snow samples were collected and kept frozen for analysis with a Single Particle Soot Photometer (SP2). Calculated eBC mass from the LAHM analysis and the SP2 refractory black carbon (rBC) results were well correlated (r2 = 0.92). These results indicate that a substantial portion of the light-absorbing particles in the more polluted regions were likely BC. The 3 years of data show that glaciers in the Cordillera Blanca Mountains close to human population centers have substantially higher levels of eBC (as high as 70 ng g-1) than remote glaciers (as low as 2.0 ng g-1 eBC), indicating that population centers can influence local glaciers by sourcing BC.

  13. Spatial distribution of canine zoonotic enteroparasites in Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    Luciano F La Sala

    2015-03-01

    Full Text Available The objectives of this research were: (1 to determine the occurrence of zoonotic enteroparasites in dog feces from Bahía Blanca, Argentina; (2 to characterize the spatial distribution of the parasites found in association with the quality of life index (QLI in neighborhoods of Bahía Blanca; and (3 to determine if the presence of a particular parasite genus in a stool sample was facilitated or impeded by the presence of other parasite genera. Samples of dog stools (n = 475 were collected between December 2012 and December 2013 in areas with varying QLI. The association between QLI values and the presence of parasites was analyzed using logistic regression. Overall enteroparasite occurrence was 36.6%. Parasitic forms found included nematode larvae, cysts of Blastocystis spp., Giardia spp., and oocysts of Cryptosporidium spp., and eggs of Ancylostoma caninum, Toxocara canis, cestodes and Trichuris spp. For certain enteroparasites, we detected significant associations between their occurrence and QLI. Feces collected in areas with medium and low QLI were 2.46 and 5.43 times more likely, respectively, to contain A. caninum than stools from the high-QLI area. Samples from areas with low QLI were 2.36 times more likely to contain Trichuris spp. than those from the high QLI area. Regarding protozoa, feces from areas with low QLI were 2.4 times more likely to be positive than those from areas with high QLI. We demonstrated that canine zoonotic parasites have a wide distribution in the study area, and that occurrence is higher in neighborhoods with lower QLI.

  14. Inflamación crónica granulomatosa en el pez teleósteo Piaractus mesopotamicus: modelo de estudio histopatológico

    OpenAIRE

    G Manrique, Wilson; AP Figueiredo, Mayra; Belo, Marco AA; Martins, Maurício L; Moraes, Flávio R

    2017-01-01

    Objetivo. Este estudio evaluó la cinética celular y la formación de granuloma durante la inflamación crónica inducida por el Bacilo Calmette-Guérin (BCG) en el músculo esquelético de Piaractus mesopotamicus, como modelo histopatológico para estudiar la inmunidad innata. Materiales y métodos. Sesenta peces fueron divididos en dos grupos: peces inoculados con BCG y no inoculados y la respuesta inflamatoria analizada en 3, 7, 14, 21 y 33 días post-inóculo (DPI) por medio del análisis histopatoló...

  15. Microsatellite analysis of the parental contribution of Piaractus mesopotamicus to the production of offspring in the semi-natural system of reproduction

    Directory of Open Access Journals (Sweden)

    Jayme Aparecido Povh

    2010-04-01

    Full Text Available The objective of this study was to evaluate the genetic diversity and the parental contribution of Piaractus mesopotamicus in the production of offspring in the semi-natural system of reproduction. Twenty parental fishes (eleven males and nine females and the total of 100 larvae were evaluated by microsatellite marker. The parents and offspring had thirty-one alleles and heterozygosity of 0.550 and 0.563, respectively. The females were fertilised by two up to six males while the males fertilised three up to five females. The contribution of the females and males to the offspring were 66.6 and 58%, respectively. Such results indicated no loss in the genetic variability in the offspring, and the parents had multiple paternity and reasonable contribution to the offspring production.O objetivo deste trabalho foi avaliar a diversidade genética e a contribuição parental de Piaractus mesopotamicus na produção de descendência no sistema seminatural de reprodução. Vinte peixes parentais (onze machos e nove fêmeas e o total de 100 larvas foram avaliados por meio do marcador microssátelite. Os parentais e a progênie tiveram trinta e um alelos e heterozigosidade de 0,550 e 0,563, respectivamente. As fêmeas foram fertilizadas por dois até seis machos enquanto machos fertilizaram três até cinco fêmeas. A contribuição de fêmeas e machos para a descendência seja 66,6 e 58,0%, respectivamente. Tais resultados não indicam diminuição da variabilidade genética na progênie e os parentais apresentaram paternidade múltipla e razoável contribuição à produção de descendência.

  16. Processamento da carne do pacu (Piaractus mesopotamicus cultivado em tanques-rede no reservatório de Itaipu = Processing of pacu (Piaractus mesopotamicus meat from net cage farming in the Itaipu reservoir

    Directory of Open Access Journals (Sweden)

    Robie Allan Bombardelli

    2007-10-01

    Full Text Available O trabalho objetivou avaliar as características morfométricas, bromatológicas e o rendimento de cortes da carne do pacu (Piaractus mesopotamicus, cultivados em tanquesrede. Utilizaram-se 45 animais, distribuídos em três tratamentos e 15 repetições cada uma.Os tratamentos constituíram-se de animais alimentados com ração extrusada comercial (REC, resíduos de vegetal cozido (RPV e resíduos cozidos de produção pesqueira (RPP. Realizaram-se as medidas individuais dos animais de comprimento-padrão (CP,comprimento total (CT, comprimento da cabeça (CC, altura da cabeça (AC, largura do tronco (LT, comprimento do tronco (CTR, altura do tronco (AT e, a partir delas, avaliaram-se as relações morfométricas de CC/CP, CC/AC, CP/CT, LT/CTR, LT/AT e AT/CTR. Avaliaram-se os rendimentos: carcaça (RCARC, tronco limpo (TL, musculaturadorsal (MD, filé (FL, costelas (COST, nadadeiras (NAD, gordura visceral (GVISC, pele com escamas (PELE, e os teores de umidade (UM, matéria mineral (MM, proteína bruta (PB e extrato etéreo (EE dos diferentes cortes. Observaram-se maiores resultados (pThis work was carried out to evalue the morphometric and chemical characteristics, as well as the meat cut yields from pacu (Piaractusmesopotamicus reared in net cages. Forty-five specimens were used, distributed in three treatments and 15 replications. The treatments consisted of animals fed with commercial extruded ration (CER, vegetal by-products (VBP and fishery by-products (FBP. Individual morphometric characteristics were measures in terms of standard length (SL, total length (TL, head length (HL head height (HH, body width (BW, body lenght (BL, body height (BH, to evaluate the morphometric ratio of HL/SL, HL/HH, SL/TL, BW/BL, BW/BH and BH/BL. Next, the carcass (CARC, clean body (CB, dorsal muscle (DM, fillet (FL, ribs (RIB, fin (FIN, visceral fat (VISCF, skin with scales (SKIN, as well as the levels of moisture (M, ash (ASH, crude protein (CPB and fat (FAT

  17. Seletividade alimentar de organismos-alimento por formas jovens de pacu Piaractus mesopotamicus (Holmberg, 1887 e curimba Prochilodus lineatus (Valenciennes, 1836 = Selective feeding of food organisms by fish larvae of Piaractus mesopotamicus (Holmberg, 1887 and Prochilodus lineatus (Valenciennes, 1836

    Directory of Open Access Journals (Sweden)

    Nandeyara Ribeiro Marques

    2007-04-01

    Full Text Available Objetivou-se avaliar a seleção alimentar de organismos-alimento por formas jovens de pacu (Piaractus mesopotamicus e curimba (Prochilodus lineatus com diferentes idades (6, 12, 19 e 26 dias, na presença e ausência de Pistia stratiotes. Foram utilizados quatrotratamentos (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba e quatro repetições. A cada sete dias, foram coletadas 24 larvas de cada espécie de peixe dos tanques, sendo estas mantidas em jejum por 24 horas. Depois de distribuídas nos aquários com plâncton, as larvas permaneceram por três horas, sendocoletadas e fixadas para análise, juntamente com as amostras de água. Os tratos digestórios das larvas foram retirados e analisados sob microscópio óptico. Observaram-se diferenças estatísticas na seletividade alimentar de organismos planctônicos por larvas de mesmaespécie, em diferentes idades e também entre larvas de espécies diferentes, com mesma idade, não diferindo quanto à presença ou ausência de P. stratiotes. As formas jovens de pacu e curimba selecionaram organismos similares aos seis dias de idade, passando por alterações até o 26º dia. À medida que se desenvolveram, as larvas de pacu passaram a selecionar cladóceros e ostrácodos e as de curimba, protozoários e algas.Theobjective was to evaluate the feeding selection of food organisms for two species of fish larvae (pacu and curimba at different ages (6, 12, 19 and 26 days after eclosion, in the presence or absence of Pistia stratiotes. Four treatments were used (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba and four replications. Every seven days, 24 fish larvae of each species were collected, and kept without food for 24 hours. Afterbeing distributed in the aquariums with plankton, the larvae stayed for three hours, and were collected and prepared for analysis, along with the water samples. The digestive tract of the fish larvae were

  18. Remote Sensing Analysis of the Sierra Blanca (Faskin Ranch) Low-Level Radioactive Waste Disposal Site, Hudspeth County, Texas

    Energy Technology Data Exchange (ETDEWEB)

    LeMone, D. V.; Dodge, R.; Xie, H.; Langford, R. P.; Keller, G. R.

    2002-02-26

    Remote sensing images provide useful physical information, revealing such features as geological structure, vegetation, drainage patterns, and variations in consolidated and unconsolidated lithologies. That technology has been applied to the failed Sierra Blanca (Faskin Ranch) shallow burial low-level radioactive waste disposal site selected by the Texas Low-Level Radioactive Waste Disposal Authority. It has been re-examined using data from LANDSAT satellite series. The comparison of the earlier LANDSAT V (5/20/86) (30-m resolution) with the later new, higher resolution ETM imagery (10/23/99) LANDSAT VII data (15-m resolution) clearly shows the superiority of the LANDSAT VII data. The search for surficial indications of evidence of fatal flaws at the Sierra Blanca site utilizing was not successful, as it had been in the case of the earlier remote sensing analysis of the failed Fort Hancock site utilizing LANDSAT V data. The authors conclude that the tectonic activity at the Sierra Blanca site is much less recent and active than in the previously studied Fort Hancock site. The Sierra Blanca site failed primarily on the further needed documentation concerning a subsurface fault underneath the site and environmental justice issues. The presence of this fault was not revealed using the newer LANDSAT VII data. Despite this fact, it must be remembered that remote sensing provides baseline documentation for determining future physical and financial remediation responsibilities. On the basis of the two sites examined by LANDSAT remote sensing imaging, it is concluded that it is an essential, cost-effective tool that should be utilized not only in site examination but also in all nuclear-related facilities.

  19. Variant texts of Calderón’s plays in unreliable editions: Las manos blancas no ofenden

    Directory of Open Access Journals (Sweden)

    Fernando Rodríguez-Gallego

    2017-07-01

    Full Text Available This article outlines the state of the question regarding Calderón’s re-writing of his own plays, with attention to the kind of version in which the different texts have been preserved, and focusing on those cases in which none of the editions has been supervised in any sense by Calderón. The problems arising from this situation are exemplified in the textual transmission of the play Las manos blancas no ofenden.

  20. Lipophilic antioxidant activity of guava fruit varieties Palmira ICA I, Regional Roja and Regional Blanca in four ripening stages

    OpenAIRE

    Mauricio Espinal R; Jorge Iván Daza A; Luz Patricia Restrepo S

    2012-01-01

    We determined the lipophilic antioxidant activity and β-carotene content with HPLC-UV in guava fruit Psidium guajava L.) varieties Palmira ICA I, Regional Roja and Regional Blanca in the ripening stages: green, semi-ripe, mature and senescent. It was established that the β-carotene content and lipophilic antioxidant activity increased during the ripening process up to the climacteric maximum and decreased during senescence; lipophilic antioxidant activity being higher in the varieties Palmira...

  1. Landslides in moraines as triggers of glacial lake outburst floods: example from Palcacocha Lake (Cordillera Blanca, Peru)

    Czech Academy of Sciences Publication Activity Database

    Klimeš, Jan; Novotný, J.; Novotná, I.; Urries de, B.J.; Vilímek, V.; Emmer, Adam; Strozzi, T.; Kusák, Michal; Rapre, A.C.; Hartvich, Filip; Frey, H.

    2016-01-01

    Roč. 13, č. 6 (2016), s. 1461-1477 ISSN 1612-510X R&D Projects: GA ČR(CZ) GAP209/11/1000 Institutional support: RVO:67985891 ; RVO:67179843 Keywords : landslides * moraines * glacial lakes * slope stability calculation * glacial lake outburst floods * impact wave models * Cordillera Blanca Subject RIV: DE - Earth Magnetism, Geodesy, Geography; DE - Earth Magnetism, Geodesy, Geography (UEK-B) Impact factor: 3.657, year: 2016

  2. Quaternary Slip History for the Agua Blanca Fault, northern Baja California, Mexico

    Science.gov (United States)

    Gold, P. O.; Behr, W. M.; Rockwell, T. K.; Fletcher, J. M.

    2017-12-01

    The Agua Blanca Fault (ABF) is the primary structure accommodating San Andreas-related right-lateral slip across the Peninsular Ranges of northern Baja California. Activity on this fault influences offshore faults that parallel the Pacific coast from Ensenada to Los Angeles and is a potential threat to communities in northern Mexico and southern California. We present a detailed Quaternary slip history for the ABF, including new quantitative constraints on geologic slip rates, slip-per-event, the timing of most recent earthquake, and the earthquake recurrence interval. Cosmogenic 10Be exposure dating of clasts from offset fluvial geomorphic surfaces at 2 sites located along the western, and most active, section of the ABF yield preliminary slip rate estimates of 2-4 mm/yr and 3 mm/yr since 20 ka and 2 ka, respectively. Fault zone geomorphology preserved at the younger site provides evidence for right-lateral surface displacements measuring 2.5 m in the past two ruptures. Luminescence dating of an offset alluvial fan at a third site is in progress, but is expected to yield a slip rate relevant to the past 10 kyr. Adjacent to this third site, we excavated 2 paleoseismic trenches across a sag pond formed by a right step in the fault. Preliminary radiocarbon dates indicate that the 4 surface ruptures identified in the trenches occurred in the past 6 kyr, although additional dating should clarify earthquake timing and the mid-Holocene to present earthquake recurrence interval, as well as the likely date of the most recent earthquake. Our new slip rate estimates are somewhat lower than, but comparable within error to, previous geologic estimates based on soil morphology and geodetic estimates from GPS, but the new record of surface ruptures exposed in the trenches is the most complete and comprehensively dated earthquake history yet determined for this fault. Together with new and existing mapping of tectonically generated geomorphology along the ABF, our constraints

  3. CASOS SELECTOS DE RESISTENCIA A INSECTICIDAS EN MOSCAS BLANCAS (Hemiptera: Aleyrodidae EN EL MUNDO

    Directory of Open Access Journals (Sweden)

    Macías-flores A

    2013-01-01

    Full Text Available Las moscas blancas (Hemíptera: Aleyrodidae son un problema a escala global. En México, llamó la atención como plaga agrícola en la década de los años 80´s y 90´s del siglo pasado por las pérdidas económicas que ocasionaron en los cultivos agrícolas, debido a los daños directos por la succión de savia y a los daños indirectos por la transmisión de enfermedades de origen viral. El hombre en su intento fallido por erradicarlas ha hecho uso desmedido de insecticidas químicos, quizás por su accesibilidad por costo bajo o por efectos de control inmediatos, por lo cual ha causado daño al medio ambiente y a la salud humana, con la consecuencia de desarrollo de resistencia. En un intento por disminuir los efectos de tales sustancias, muchas investigaciones alrededor del mundo se han conducido para encontrar productos insecticidas más efectivos con el menor impacto ambiental y a la salud humana, y que contribuyan a incrementar las herramientas de control disponibles en los sistemas de producción agrícola.

  4. Uranium deposits associated to tertiary acid volcanism of the Pena Blanca Sierra (Chihuahua, Mexico)

    International Nuclear Information System (INIS)

    Aniel, B.

    1986-12-01

    The uraniferous deposits located in the Sierra de Pena Blanca (Chihuahua, Mexico) are the consequence of successive events that modified acid volcanic rocks. The devitrification of the Nopal Formation, vitroclastic tuffs, is esential in the cooling history because it releases uranium that becomes available. The uranium present in fluids as uranylcarbonate complexes, precipitate along the lamellea of hematite (exsolutions of the ilmenites). The presence of sulfur causes the destabilization of the ilmenites with uranium oxide (pitchblende - titanium oxide - pyrite), the pseudomorph of magnetites (pitchblende - pyrite) and the transformation of hematite into pyrite. The silice coming from the kaolinization of feldspars recristallizes as microcristalline quartz so that the rock appears compact. Fractures cause the uplifting of the lower unit of Nopal formation. It has been altered to montmorillonite. A carbonatation of this tuff has been observed and these two types of alteration occur after kaolinization. The Escuadra formation overlies the Nopal formation. The deposition takes place on an eroded basement where a soil developed. The two formations will together undergo transformations due to the saturation level and the primary ore will be only oxidized or oxidized, transported and reconcentrated. Late and localized thermal activities have been observed and may be the result of tectonic movements occurring after the supergene modification [fr

  5. Organotin compounds in Brachidontes rodriguezii mussels from the Bahía Blanca Estuary, Argentina.

    Science.gov (United States)

    Quintas, Pamela Y; Arias, Andrés H; Oliva, Ana L; Domini, Claudia E; Alvarez, Mónica B; Garrido, Mariano; Marcovecchio, Jorge E

    2017-11-01

    Levels of tributyltin and its breakdown compounds, including the first record of monobutyltin (MBT) in history for Latin America, were determined in native mussels (Brachidontes rodriguezii) by means of CG-MS, after extraction/derivatization assisted by ultrasound. The samples were collected in 2013 in Bahía Blanca Estuary (Argentina) at 6 sites, which reflect different levels of maritime activities. Total butyltins (TBts = TBT+ DBT+ MBT) levels ranged from 19.64 to 180.57ng Sn g -1 dry weight. According to the Oslo-Paris commission, the results indicated that 73.9% of mussels could be under biological effects risks associated with TBT pollution. In accordance with the calculated bioaccumulation factors, approximately 56% of samples appeared to have accumulated TBT through the sediments. All sampling sites were shown to be impacted by organotin compounds (OTCs) showing variable levels through seasons, which could be related with the variation of the water temperature. Degradation index analyses suggested aged inputs of TBT possibly under a general degradation process at the area of study. In addition, the occurrence of DBT and MBT could not be uniquely attributed to the degradation pathway of the TBT; in fact, results outlined the possible contribution of some punctual and diffuse sources at the area such as proximity to plastic industries, industrial effluents, sewage outlets and domestic wastewaters. Copyright © 2017 Elsevier Inc. All rights reserved.

  6. Gills of juvenile fish piaractus mesopotamicus as histological biomarkers for experimental sub-lethal contamination with the Organophosphorus Azodrin®400

    Directory of Open Access Journals (Sweden)

    Cácia Aparecida Mendes Rudnicki

    2009-12-01

    Full Text Available Piaractus mesopotamicus is a freshwater native fish from rivers of the Paraná-Paraguay Basin and of the Pantanal region and has been used for repopulation programs in Brazil. Juvenile fishes were exposed to the sub-lethal dose of 1.08mg/L of the OP Azodrin®400 containing 0.43µL/L of the active principle monocrotophos for 96 h. A frequent pathology in the gills at all times of exposure was epithelial detachment, from minimal until 24 h of exposure, to intense after 48 h of contamination. Deformed pillar cells in the respiratory lamellae leading to irregular blood spaces and blood congestion, as well as hyperplasia and lamellar fusion were observed. These histopathologies suggested that 48 h after T0 was an important time when a reduction in the capability for gaseous exchange with consequent weakening of the fishes' condition could occur. This could impair growth and development of juveniles introduced in water bodies for repopulation programs.Piaractus mesopotamicus é um peixe de água doce encontrado na Bacia Paraná-Paraguai e na região do Pantanal, tendo sido usado em programas de repovoamento no Brasil. Peixes juvenis foram expostos por 96 horas à dose sub-letal de 1.08mg/L do organofosforado (OP Azodrin®400 que contém 0,43µL/L do principio ativo monocrotofós. A patologia freqüente nas brânquias foi o descolamento epitelial que variou de mínimo nas primeiras 24 horas a severo ou intenso após 48 horas de contaminação. Deformações e degeneração de células pilares nas lamelas respiratórias levando à formação de espaços sanguíneos irregulares e congestão sanguínea, hiperplasia e fusão lamelar também foram observadas. Sugere-se que 48 horas após o T0 é um tempo crítico após exposição a níveis subletais de OP, pois a capacidade de trocas gasosas poderá ter diminuído, levando ao enfraquecimento dos peixes. Os sintomas poderão prejudicar o desenvolvimento dos juvenis introduzidos em corpos de água em

  7. Predação de larvas de pacu (Piaractus mesopotamicus, Holmberg por copépodes ciclopóides (Mesocyclops longisetus, Thiébaud em diferentes densidades e ambientes e com diferentes contrastes visuais Predation of pacu (Piaractus mesopotamicus, Holmberg larvae by cyclopoid copepods (Mesocyclops longisetus, Thiébaud at different densities in environments with different visual contrast

    Directory of Open Access Journals (Sweden)

    Carmino Hayashi

    2001-05-01

    Full Text Available O objetivo do presente trabalho foi avaliar a influência da densidade de copépodes ciclopóides (Mesocyclops longisetus na predação de larvas de pacu (Piaractus mesopotamicus em ambientes com diferentes contrastes visuais. Foram utilizadas 360 larvas de pacu (Lt = 5,77±0,23 mm e Wt = 6,57 mg, distribuídas em 24 aquários (1-L de vidro transparente, em um delineamento em blocos casualizados com oito tratamentos e três repetições, que constaram de 0, 10, 20 e 30 copépodes/L, em aquários com paredes sem revestimento ou com paredes revestidas de plástico escuro. Realizou-se a contagem, a cada uma hora, das larvas mortas e em seguida elas eram retiradas com uma pipeta. Observou-se um aumento linear nas taxas de predação (p Influence of density of cyclopoid copepods (Mesocyclops longisetus on pacu larvae (Piaractus mesopotamicus predation in environments with different visual contrast is provided. Three hundred and sixty larvae (Lt: 5.77±0.23 mm and Wt: 6.57 mg were distributed in 24 one-liter light-color-lined aquaria, in a entirely randomized design, with eight treatments and three replications, with densities 0, 10, 20 and 30 copepods/L. Similar densities were used and distributed in aquaria with dark plastic lined interior. Dead larvae were counted hourly and removed with a pipette. After three hours from the start of experiment a linear increase in predation rate (p th to the 9th observation, with smaller survival values of pacu larvae in light-colored aquaria. It may be concluded that increase in copepod density and absence of lining on walls of aquaria favor higher predation rates of copepods on pacu larvae

  8. Eficácia do diflubenzuron no controle de Dolops carvalhoi (Crustacea: Branchiura em jovens pacus Piaractus mesopotamicus (Osteichthyes: Characidae naturalmente infectados - DOI: 10.4025/actascianimsci.v27i2.1235 Diflubenzuron effectiveness in Dolops carvalhoi (Crustacea: Branchiura control in juvenile pacus Piaractus mesopotamicus (Osteichthyes: Characidae naturally infected - DOI: 10.4025/actascianimsci.v27i2.1235

    Directory of Open Access Journals (Sweden)

    Julieta Rodini Engrácia de Moraes

    2005-03-01

    Full Text Available Neste ensaio, avaliou-se a eficácia terapêutica do diflubenzuron contra o crustáceo Dolops carvalhoi (Crustacea: Branchiura em pacus Piaractus mesopotamicus Holmberg 1887 (Osteichthyes: Characidae naturalmente infestados. A droga foi aplicada três vezes na concentração de 2,0 mg/L de água, na forma de banhos com trinta minutos de duração e intervalo de 24 horas. Um grupo controle foi submetido ao mesmo procedimento, sem a adição do fármaco à água. A avaliação parasitológica revelou que a eficácia da droga foi de 97,2%. No grupo tratado houve redução da glicemia, aumento da quantidade de eritrócitos, redução do percentual de células granulocíticas especiais e aumento da quantidade de trombócitos circulantes coincidentes com a eliminação dos parasitos, quando comparado ao grupo controle. Os resultados indicam que ocorreu melhora marcante na saúde dos peixesThis research evaluated the therapeutic efficacy of diflubenzuron against Dolops carvalhoi (Crustacean: Branchiura in Piaractus mesopotamicus (Osteichthyes: Characidae naturally infested. The drug was applied three times, at a dose of 2.0 mg/L of water, in the form of baths within thirty minutes and an interval of 24 hours. A control group was submitted to the same procedure, but without pharmaco in the water. The parasitological evaluation showed that the drug effectiveness was 97.2%. In the treated group there were glycemia reduction, increase in the erythrocyte number, decrease in the percentage of special granulocytic cells and increase in the number of circulant trombocytes similar to the parasites elimination when compared to the control group. Results showed an important improvement in fish health

  9. Epithermal uranium deposits in a volcanogenic context: the example of Nopal 1 deposit, Sierra de Pena Blanca, Mexico

    Science.gov (United States)

    Calas, G.; Angiboust, S.; Fayek, M.; Camacho, A.; Allard, T.; Agrinier, P.

    2009-12-01

    The Peña Blanca molybdenum-uranium field (Chihuahua, Mexico) exhibits over 100 airborne anomalies hosted in tertiary ignimbritic ash-flow tuffs (44 Ma) overlying the Pozos conglomerate and a sequence of Cretaceous carbonate rocks. Uranium occurrences are associated with breccia zones at the intersection of two or more fault systems. Periodic reactivation of these structures associated with Basin and Range and Rio Grande tectonic events resulted in the mobilization of U and other elements by meteoric fluids heated by geothermal activity. Trace element geochemistry (U, Th, REE) provides evidence for local mobilization of uranium under oxidizing conditions. In addition, O- and H-isotope geochemistry of kaolinite, smectite, opal and calcite suggests that argillic alteration proceeded at shallow depth with meteoric water at 25-75 °C. Focussed along breccia zones, fluids precipitated several generations of pyrite and uraninite together with kaolinite, as in the Nopal 1 mine, indicating that mineralization and hydrothermal alteration of volcanic tuffs are contemporaneous. Low δ34S values (~ -24.5 ‰) of pyrites intimately associated with uraninite suggest that the reducing conditions at the origin of the U-mineralization arise from biological activity. Later, the uplift of Sierra Pena Blanca resulted in oxidation and remobilization of uranium, as confirmed by the spatial distribution of radiation-induced defect centers in kaolinites. These data show that tectonism and biogenic reducing conditions can play a major role in the formation and remobilization of uranium in epithermal deposits. By comparison with the other uranium deposits at Sierra Pena Blanca and nearby Sierra de Gomez, Nopal 1 deposit is one of the few deposits having retained a reduced uranium mineralization.

  10. Proglacial hydrology in the tropical Andes: lessons from the Cordillera Blanca, Peru (Invited)

    Science.gov (United States)

    McKenzie, J. M.; Mark, B. G.; Baraer, M.

    2009-12-01

    Understanding the complexities of tropical Andean hydrology is critical for managing modern water resources and interpreting paleohydrologic records. Glaciers are the most visible component of these systems, responding to global climate change and acting as critical hydrologic reservoirs. Tropical Andean glaciers are undergoing rapid retreat with complex impacts on the downstream hydrology. Groundwater is also an important component of the Andean regional hydrologic system, but its contribution is difficult to assess due to remote site access, minimal baseline data, and lack of continuous historical discharge and precipitation measurements. We have synthesized hydrochemical data from synoptically sampled glacial melt water, groundwater, precipitation, and stream discharge collected intermittently between 1998 and July 2008 throughout the Callejon de Huaylas, a 5000 km2 watershed that drains the western side of the Cordillera Blanca in northern Perú. Our data from 2004 to 2006 show systematic annual shifts in the isotopic ratios (δ18O and δ2H) of river water, indicating an increase in glacial melt water input, and we are able to use these changes across the Cordillera Blanca to estimate an average increase of 1.6 (± 1.1) % in the specific discharge of the glacierized basins. Enhanced total stream discharge in more glacierized catchments (>20% glacier area) is demonstrated by a significant positive trend in a 43-year discharge anomaly record. Our hydrochemical basin characterization method (HBCM) uses chemical mass balance mixing to quantify the contribution of glacial melt water, groundwater, and surface runoff to streams for different valleys and nested watersheds in the Callejon de Huaylas. The Yanamarey basin (7% glaciated) has been observed since 1998 and the HBCM results show good agreement with measured stream discharge (maximum R2 of 0.99) for monthly cumulative values. These results suggest that for most of the studied years groundwater is the main

  11. Stratigraphy of the PB-1 well, Nopal I uranium deposit, Sierra Pena Blanca, Chihuahua, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Dobson, P.; Fayek, M.; Goodell, P.; Ghezzehei, T.; Melchor, F.; Murrell, M.; Oliver, R.; Reyes-Cortes, I.A.; de la Garza, R.; Simmons, A.

    2008-08-01

    The Nopal I site in the Pena Blanca uranium district has a number of geologic and hydrologic similarities to the proposed high-level radioactive waste repository at Yucca Mountain, making it a useful analogue to evaluate process models for radionuclide transport. The PB-1 well was drilled in 2003 at the Nopal I uranium deposit as part of a DOE-sponsored natural analogue study to constrain processes affecting radionuclide transport. The well penetrates through the Tertiary volcanic section down to Cretaceous limestone and intersects the regional aquifer system. The well, drilled along the margin of the Nopal I ore body, was continuously cored to a depth of 250 m, thus providing an opportunity to document the local stratigraphy. Detailed observations of these units were afforded through petrographic description and rock-property measurements of the core, together with geophysical logs of the well. The uppermost unit encountered in the PB-1 well is the Nopal Formation, a densely welded, crystal-rich, rhyolitic ash-flow tuff. This cored section is highly altered and devitrified, with kaolinite, quartz, chlorite, and montmorillonite replacing feldspars and much of the groundmass. Breccia zones within the tuff contain fracture fillings of hematite, limonite, goethite, jarosite, and opal. A zone of intense clay alteration encountered in the depth interval 17.45-22.30 m was interpreted to represent the basal vitrophyre of this unit. Underlying the Nopal Formation is the Coloradas Formation, which consists of a welded lithic-rich rhyolitic ash-flow tuff. The cored section of this unit has undergone devitrification and oxidation, and has a similar alteration mineralogy to that observed in the Nopal tuff. A sharp contact between the Coloradas tuff and the underlying Pozos Formation was observed at a depth of 136.38 m. The Pozos Formation consists of poorly sorted conglomerate containing clasts of subangular to subrounded fragments of volcanic rocks, limestone, and chert

  12. Pobreza por Ingresos en Argentina y Bahía Blanca: Estimaciones de referencia y cuestiones metodológicas

    OpenAIRE

    María Emma Santos

    2016-01-01

    En este trabajo se estima la indigencia y pobreza por ingresos en 2014 y 2015 para el total de aglomerados urbanos de Argentina y para el caso particular de Bahía Blanca, una ciudad intermedia, eminentemente industrial y comercial, con altos niveles de desempleo e indigencia recientes. Se encuentra que a mediados de 2015 una de cada diez personas estaba en situación de indigencia y casi tres de cada diez estaba en situación de pobreza, lo cual equivale a 11.6 millones de personas aproximadame...

  13. COMPORTAMIENTO DE LA ALBAHACA BLANCA (Ocimun basilicum L.) ANTE REDUCCIONES DE LAS CANTIDADES DE AGUA APLICADA POR FASES DEL DESARROLLO

    OpenAIRE

    E. Jerez; L. Barroso

    2002-01-01

    El presente trabajo se realizó con el objetivo de conocer qué fase del desarrollo de la albahaca blanca (Ocimun basilicum L.) resulta más afectada por una deficiencia hídrica y las alteraciones que se producen en el crecimiento y las relaciones hídricas en esas condiciones. Se sembraron semillas en recipientes de seis litros de capacidad con un sustrato formado por suelo y materia orgánica del tipo cachaza en una relación 3:1 v/v. Los tratamientos se controlaron por el método gravimétrico y c...

  14. Trace elements in mineral separates of the Pena Blanca Spring aubrite - Implications for the evolution of the aubrite parent body

    Science.gov (United States)

    Lodders, K.; Palme, H.; Wlotzka, F.

    1993-01-01

    A detailed chemical study is conducted of the Pena Blanca Spring aubrite in order to clarify both the origin of the aubrite parent body (APB) and its relation to the enstatite chondrites. The distribution of REE among aubritic minerals cannot be the result of fractional distillation, which would occur if high degrees of partial melting had occurred on the APB. The REE distributions instead indicate a complete equilibrium of oldhamite and other phases, so that a brief nonequilibrium melting episode must have led to the segregation of metal and sulfides.

  15. Parásitos zoonóticos en heces caninas en la ciudad de Bahía Blanca

    OpenAIRE

    la Sala, Luciano Francisco; Costamagna, Sixto R.; Leiboff, Anastasia

    2016-01-01

    [En Comunicaciones breves de la Revista Argentina de Zoonosis y Enfermedades Infecciosas Emergentes] Existe una gran cantidad de agentes infecciosos transmisibles entre el perro doméstico (Canis lupus familiaris) y el hombre. Entre estos se encuentran enteroparásitos, algunos de los cuales representan un riesgo para la salud pública aún en países desarrollados. La ciudad de Bahía Blanca, en Argentina, tiene una población de 301.531 habitantes distribuidos en 126.639 hogares. Asimismo, existen...

  16. Curva de retención suelo-agua e inicio de monitoreo en Tierra Blanca Joven (TBJ)

    OpenAIRE

    José A. Chávez; Reynaldo López; Lubomir Kopecky; José Landaverde

    2013-01-01

    En El Salvador durante la época de lluvias o cuando ocurren terremotos, las áreas cubiertas por las tefras volcánicas Tierra Blanca Joven (TBJ) sufren movimientos de ladera, licuefacción y erosión provocando pérdidas ambientales, sociales y económicas importantes. Para iniciar la caracterización de estos suelos parcialmente saturados, valores de succión de una unidad de caída de TBJ fueron obtenidos con la olla de presión, centrífuga y papel filtro para construir la Curva de Retención Suelo-A...

  17. Mapping Glacier Dynamics and Proglacial Wetlands with a Multispectral UAV at 5000m in the Cordillera Blanca, Peru

    Science.gov (United States)

    Wigmore, O.; Mark, B. G.

    2015-12-01

    The glaciers of the Cordillera Blanca, Peru are rapidly retreating as a result of rising temperatures, transforming the hydrology and impacting the socio-economic and environmental systems of the Rio Santa basin. Documenting the heterogeneous spatial patterns of these changes to understand processes of water storage and flow is hindered by technologic and logistic challenges. Highly complex topography, cloud cover and coarse spatial resolution limit the application of satellite data while airborne data collection remains costly and potentially dangerous. However, recent developments have made Unmanned Aerial Vehicle (UAV) technology a viable and potentially transformative method for studying glacier dynamics and proglacial hydrology. The extreme altitudes (4000-6700m) of the Cordillera Blanca limit the use of 'off the shelf' UAVs. Therefore we developed a low cost multispectral (visible, near-infrared and thermal infrared) multirotor UAV capable of conducting fully autonomous aerial surveys at elevations over 5000m within the glacial valleys of the Cordillera Blanca. Using this platform we have completed repeat aerial surveys (in 2014 and 2015) of the debris covered Llaca Glacier, generating highly accurate 10-20cm DEM's and 5cm orthomosaics using a structure from motion workflow. Analysis of these data reveals a highly dynamic system with some areas of the glacier losing as much as 16m of vertical elevation, while other areas have gained up to 5m of elevation over one year. The magnitude and direction of these changes appears to be associated with the presence of debris free ice faces and meltwater ponds. Additionally, we have mapped proglacial meadow and wetland systems. Thermal mosaics at 10-20cm resolution are providing novel insights into the hydrologic pathways of glacier meltwater including mapping the distribution of artesian springs that feed these wetland systems. The high spatial resolution of these UAV datasets facilitates a better understanding of the

  18. El Archivo del Centro Socialista “Agustín de Arrieta” de Bahía Blanca

    OpenAIRE

    Cabezas, Gonzalo Ezequiel

    2013-01-01

    El presente artículo se centra en el análisis de la documentación albergada por el Centro Socialista “Agustín de Arrieta” de Bahía Blanca. En primer lugar, se reconstruye brevemente el derrotero histórico de la biblioteca y del archivo del partido, derrotero íntimamente relacionado con los vaivenes, principalmente políticos, que afectaron al socialismo argentino. En segundo término, se hace una descripción general del tipo de documentación que contiene el archivo, señalando potenciales usos y...

  19. PERFIL BIOQUÍMICO SANGUÍNEO HEPÁTICO DE VENADOS COLA BLANCA (Odocoileus virginianus) CRIADOS EN CAUTIVERIO.

    OpenAIRE

    Alhuay A., David; Laboratorio de Patología Clínica y Biología Molecular, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Li E., Olga; Laboratorio de Patología Clínica y Biología Molecular, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Alvarado S., Arnaldo; Laboratorio de Patología Clínica y Biología Molecular, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Alvarado S., Arnaldo; Laboratorio de Patología Clínica y Biología Molecular, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Falcón P., Néstor; Laboratorio de Medicina Veterinaria Preventiva, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima; Ríos M., Patricia; Parque Ecológico Santa Rosa de Lima y Zoocriadero del Colegio de la Inmaculada, Lima; Rojas M., Gianmarco; Zoológico Huachipa, Lima

    2011-01-01

    El presente estudio se llevó a cabo con 23 venados cola blanca (Odocoileus virginianus), de ambos sexos, y criados en cautiverio en la provincia de Lima, con el objetivo de determinar el perfil bioquímico sanguíneo hepático a través de los valores séricos de Bilirrubina Total y Directa, Proteínas Totales, Albúmina, Alanino Amino Transferasa (ALT), Aspartato Amino Transferasa (AST), Fosfatasa Alcalina (FA), y Gamma Glutamil Transferasa (GGT). Los animales (7 machos y 16 hembras), perteneciente...

  20. Elementos culturales en la serie televisiva "Dos chicas sin blanca": análisis traductológico

    OpenAIRE

    Pina Asensi, Pablo

    2017-01-01

    El presente trabajo analiza la traducción de los elementos culturales dentro de la serie televisiva Dos chicas sin blanca y consta de dos partes claramente diferenciadas. En primer lugar, en la parte teórica, se desarrolla la teoría relacionada con los elementos culturales, las diversas técnicas de traducción con las que contamos para poder adaptar esos elementos a la cultura de recepción, la relación entre los elementos culturales y el humor, y las diferentes modalidades de traducción audiov...

  1. La casa y la mesa de la reina Blanca de Navarra (1433

    Directory of Open Access Journals (Sweden)

    Serrano Larrayoz, Fernando

    2000-06-01

    Full Text Available This study tries to amplify a subject not developed enough, for the moment, in the lines of historical research that are being carried out in Navarre. It is divided in two sections. On one hand, aspects as servants, provision, products and prices, among others, have been studied through the organisation in queen Blanca's Hostel. On the other hand, we have approached the symbolic factor that feeding implies. We have also studied questions relating to crockery, feeding paces, religious aspects and beneficiaries from food. At last, in spite of having few and dispersed data, we have tried to give a view about culinary practises in the navarresse court during the first half of the 15th century.[fr] L'étude envisage l'approfondisement d'un sujet jusqu'au présent peu développé, dans les lignes de recherche historique prioritaires en Navarre. Le travail est divisé en deux sections. D'une part, l'organisation de l'Hôtel de la reine Blanche, dont on a analise les serviteurs, les fourniseurs, les produits et les prix, parmis d'autres aspects de l'institution. De l'autre, on s'est approché à l'élément symbolique que la nourriture implique, en touchant des matières comme les vaisselles, les rythmes alimentaires, les aspects religieux et les bénéficiaires des aliments. Enfin, malgré les rares sources disponibles, on a cherché à donner aussi une vision générale des pratiques culinaires de la Cour navarraise au XVᵉ siècle.

  2. Water Resources and Groundwater in a Glaciated Andean Watershed (Cordillera Blanca, Peru)

    Science.gov (United States)

    McKenzie, J. M.; Gordon, R.; Baraer, M.; Lautz, L.; Mark, B. G.; Wigmore, O.; Chavez, D.; Aubry-Wake, C.

    2014-12-01

    It is estimated that almost 400 million people live in watersheds where glaciers provide at least 10% of the runoff, yet many questions remain regarding the impact of climate change and glacier recession on water resources derived from these high mountain watersheds. We present research from the Cordillera Blanca, Peru, an area with the highest density of glaciers in the tropics. While glacier meltwater buffers stream discharge throughout the range, groundwater is a major component of dry season runoff, contributing up to 50-70% of outflow in some tributaries. In order to predict future changes to water resources it is critical to understand how groundwater can offset future hydrologic stress by maintaining stream baseflow, including recharge mechanisms, subsurface pathways, storage, and net fluxes to rivers. We present a synthesis of results based on hydrologic modeling, drilling/piezometers, geophysics, and artificial and natural hydrologic tracers. Our findings show that 'pampas', low-relief mountain valleys, are critical for baseflow generation by storing groundwater on interannual timescales. Pampas have a total area of ~65 km2 and are comprised of unconsolidated glacial, talus, lacustrine and wetland (bofedales) deposits. The valleys commonly have buried talus aquifers that are overlain by low permeability, glaciolacustrine deposits. Glaciofluvial outwash deposits and small wetlands also act as unconfined aquifers. These groundwater systems appear to be primarily recharged by wet season precipitation, and at higher elevations also by glacial meltwater. Additionally a ubiquitous feature in the valleys are springs, often located at the base of talus deposits, which generate a large hydrologic flux within the hydrologic systems. While glaciers are the most visible and vulnerable component of the Andean waterscape, we argue that it is crucial to understand the complete mountain hydrologic cycle, including groundwater, in order to understand the ongoing

  3. Basic diagnosis of solid waste generated at Agua Blanca State Park to propose waste management strategies.

    Science.gov (United States)

    Laines Canepa, José Ramón; Zequeira Larios, Carolina; Valadez Treviño, Maria Elena Macías; Garduza Sánchez, Diana Ivett

    2012-03-01

    State parks are highly sensitive areas of great natural importance and tourism value. Herein a case study involving a basic survey of solid waste which was carried out in 2006 in Agua Blanca State Park, Macuspana, Tabasco, Mexico with two sampling periods representing the high and low tourist season is presented. The survey had five objectives: to find out the number of visitors in the different seasons, to consider the daily generation of solid waste from tourist activities, to determine bulk density, to select and quantify sub-products; and to suggest a possible treatment. A daily average of 368 people visited the park: 18,862 people in 14 days during the high season holiday (in just one day, Easter Sunday, up to 4425 visitors) and 2092 visitors in 43 days during the low season. The average weight of the generated solid waste was 61.267 kg day(-1) and the generated solid waste average per person was 0.155 kg person(-1 ) day(-1). During the high season, the average increased to 0.188 kg person(-1 ) day(-1) and during the low season, the average decreased to 0.144 kg person(-1 ) day(-1). The bulk density average was 75.014 kg m(-3), the maximum value was 92.472 kg m(-3) and the minimum was 68.274 kg m(-3). The sub-products comprised 54.52% inorganic matter; 32.03% organic matter, 10.60% non-recyclable and 2.85% others. Based on these results, waste management strategies such as reuse/recycling, aerobic and anaerobic digestion, the construction of a manual landfill and the employment of a specialist firm were suggested.

  4. Monitoreo de estados inmaduros de la mosca blanca [Trialeurodes vaporariorum (Westwood) (Homoptera-Aleyrodidae)] reinfestando cultivo de tomate bajo invernadero en el período estival

    OpenAIRE

    Sánchez, Daniel E.; Scotta, Roberto R.; Arregui, María Cristina

    2002-01-01

    En los cultivos de tomate en invernadero, la mosca blanca de los invernaderos (Trialeurodes vaporariorum) se ha convertido en plaga clave, tanto por los daños que ocasiona, como por la dificultad para su control con métodos químicos. El objetivo de este trabajo fue determinar la distribución de los estados inmaduros de mosca blanca reinfestando la planta de tomate cultivada bajo invernadero, las áreas de concentración en el cultivo y detectar si existía en el período estival una relación entr...

  5. Proyecto de producción y comercialización de compota de zanahoria blanca en la ciudad de Guayaquil

    OpenAIRE

    Cedeño Cáceres, Karla Paola; Quimí Lino, Manuel Enrique; Rivera Flores, Stalin

    2013-01-01

    El proyecto a emprender se encuentra enfocado en la elaboración y producción de la compota de zanahoria blanca en la ciudad de Guayaquil, teniendo como materia prima la zanahoria blanca, que con sus propiedades nutritivas aún desconocida por muchos, esta cuenta con un gran valor nutricional el cual con nuestro proyecto pretendemos dar a conocer, de modo que podemos aprovechar la ventaja de que aún no existe en el mercado un producto con estas características. Este sería un prod...

  6. Aloe vera enhances the innate immune response of pacu (Piaractus mesopotamicus) after transport stress and combined heat killed Aeromonas hydrophila infection.

    Science.gov (United States)

    Zanuzzo, Fábio S; Sabioni, Rafael E; Montoya, Luz Natalia F; Favero, Gisele; Urbinati, Elisabeth C

    2017-06-01

    In this study, pacu (Piaractus mesopotamicus) were fed with diets containing Aloe vera for 10 days prior to transport stress and infection with heat killed Aeromonas hydrophila. A. vera is popular around the world due to its medicinal properties, including immunostimulatory effects which was observed in this study. The results show that transport causes immunosuppression, an effect that was prevented by A. vera. Specifically, A. vera prevented reductions of both leukocyte respiratory burst and hemolytic activity of complement system caused by transport. Further, fish fed with A. vera also showed significantly higher leukocyte respiratory burst, serum lysozyme concentrations and activity of complement system 24 h after bacterial infection. Additionally, we observed that A. vera may modulate the innate response through activation of complement system during bacterial immune stimulation. In summary, A. vera extract enhanced innate immune parameters and consequently the ability of fish to cope with pathogens following transport stress. These findings show that A. vera has promise for use in aquaculture and add further evidence that medicinal herbs added to fish feed assist to prevent disease outbreaks. Copyright © 2017 Elsevier Ltd. All rights reserved.

  7. Recent trends in annual snowline variations in the northern wet outer tropics: case studies from southern Cordillera Blanca, Peru

    Science.gov (United States)

    Veettil, Bijeesh Kozhikkodan; Wang, Shanshan; Bremer, Ulisses Franz; de Souza, Sergio Florêncio; Simões, Jefferson Cardia

    2017-07-01

    This paper describes the changes in the annual maximum snowlines of a selected set of mountain glaciers at the southern end of the Cordillera Blanca between 1984 and 2015 using satellite images. Furthermore, we analysed the existing glacier records in the Cordillera Blanca since the last glacial maximum to understand the evolution of glaciers in this region over a few centuries. There was a rise in the snowline altitude of glaciers in this region since the late 1990s with a few small glacier advances. Historical to the present El Niño-Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) records were also analysed to understand whether there was a teleconnection between the glacier fluctuations in the region and the phase changes of ENSO and PDO. We also assessed the variations in three important climatic parameters that influence the glacier retreat—temperature, precipitation, and relative humidity—over a few decades. We calculated the anomalies as well as the seasonal changes in these variables since the mid-twentieth century. There was an increase in temperature during this period, and the decrease in precipitation was not so prominent compared with the temperature rise. There was an exceptionally higher increase in relative humidity since the early 2000s, which is relatively higher than that expected due to the observed rate of warming, and this increase in humidity is believed to be the reason behind the unprecedented rise in the snowline altitudes since the beginning of the twenty-first century.

  8. Total fine root mass and nutrient content in forest ecosystems (Pinus patula Schltdl and Cham Cupressus lusitanica Mill and Quercus humboldtii bonpl.) from Piedras Blancas, Antioquia - Colombia

    International Nuclear Information System (INIS)

    Barreto Sanchez, Luis Hernan; Leon Pelaez, Juan Diego

    2005-01-01

    In the Piedras Blancas region, Antioquia - Colombia, a sampling of fine roots K > Mg > Fe > P this study sought to highlight the importance of fine roots and their concentrations of nutrients in natural forests and plantations and their relationship with nutrient cycling. For this purpose, the methodological approach comprised total root mass, both dead and alive

  9. U-Series Disequilibria in Soils, Pena Blanca Natural Analog, Chihuahua, Mexico

    International Nuclear Information System (INIS)

    D. French; E. Anthony; P. Goodell

    2006-01-01

    The Nopal I uranium deposit located in the Sierra Pena Blanca, Mexico. The deposit was mined in the early 1980s, and ore was stockpiled close by. This stockpile area was cleared and is now referred to as the Prior High Grade Stockpile (PHGS). Some of the high-grade boulders from the site rolled downhill when it was cleared in the 1990s. For this study soil samples were collected from the alluvium surrounding and underlying one of these boulders. A bulk sample of the boulder was also collected. Because the Prior High Grade Stockpile had no ore prior to the 1980s a maximum residence time for the boulder is about 25 years, this also means that the soil was at background as well. The purpose of this study is to characterize the transport of uranium series radionuclides from ore to the soil. Transport is characterized by determining the activities of individual radionuclides and daughter to parent ratios. Isotopes of the uranium series decay chain detected include 210 Pb, 234 U, 230 Th, 226 Ra, 214 Pb, and 214 Bi. Peak areas for each isotope are determined using gamma-ray spectroscopy with a Canberra Ge (Li) detector and GENIE 2000 software. The boulder sample is close to secular equilibrium when compared to the standard BL-5 (Beaver Lodge Uraninite from Canada). Results for the soils, however, indicate that some daughter/parent pairs are in secular disequilibrium. These daughter/parent (D/P) ratios include 230 Th/ 234 U, which is greater than unity, 226 Ra/ 230 Th, which is also greater than unity, and 210 Pb/ 214 Bi, which is less than unity. The gamma-ray spectrum for organic material lacks 230 Th peaks, but contains 234 U and 226 Ra, indicating that plants preferentially incorporate 226 Ra. Our results, combined with previous studies require multistage history of mobilization of the uranium series radionuclides. Earlier studies at the ore zone could limit the time span for mobilization only to a few thousand years. The contribution of this study is that the short

  10. Evolución de estrellas enanas blancas de Helio de masa baja e intermedia

    Science.gov (United States)

    Althaus, L. G.; Benvenuto, O. G.

    Numerosas observaciones realizadas particularmente en los últimos dos años parecen confirmar que las enanas blancas (EB) de helio de masa baja e intermedia son el resultado de la evolución de sistemas binarios cercanos. Con el objeto de realizar una adecuada interpretación de estos objetos son necesarios modelos de EBs de helio lo más detallado posibles. En este estudio presentamos cálculos detallados de la evolución de EBs de helio con masas entre M=0.1Msolar y M=0.5Msolar a intervalos de 0.05Msolar . Para ello, hemos tenido en cuenta los efectos de temperatura finita mediante un código de evolución estelar lo más actualizado posible. En particular, el transporte de energía es descripto en el marco del nuevo modelo para la convección turbulenta desarrollado por Canuto - Mazzitelli. Además hemos considerado la nueva ecuación de estado para plasmas de helio de Saumon et al. y nuevas opacidades radiativas OPAL. Las pérdidas por neutrinos fueron asimismo tenidas en cuenta. Excepto para las EBs más masivas, nuestros modelos iniciales están ubicados en las cercanías de la correspondiente línea de Hayashi para configuraciones de helio. Nuestros resultados muestran que existe una región prohibida en el diagrama observacional HR donde ninguna EB de helio puede encontrarse. Dicha región es para log{(L/Lsolar )}>= -0.25 and log{Teff} >= 4.45. Hemos encontrado también que los tracks evolutivos en el diagrama HR en el dominio de alta luminosidad (pre - EB) son fuertemente afectados por la eficiencia convectiva y que las pérdidas por neutrinos son importantes en los modelos más masivos. Finalmente hemos analizado la estructura de la zona convectiva externa encontrando que la teoría de Canuto - Mazzitelli conduce a un perfil convectivo muy diferente del dado por cualquier versión de la popular teoría de la mixing length. Si bién este comportamiento es decisivo en el contexto de las inestabilides pulsacionales, los radios y gravedades superficiales de

  11. U-Sries Disequilibra in Soils, Pena Blanca Natural Analog, Chihuahua, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    D. French; E. Anthony; P. Goodell

    2006-03-16

    The Nopal I uranium deposit located in the Sierra Pena Blanca, Mexico. The deposit was mined in the early 1980s, and ore was stockpiled close by. This stockpile area was cleared and is now referred to as the Prior High Grade Stockpile (PHGS). Some of the high-grade boulders from the site rolled downhill when it was cleared in the 1990s. For this study soil samples were collected from the alluvium surrounding and underlying one of these boulders. A bulk sample of the boulder was also collected. Because the Prior High Grade Stockpile had no ore prior to the 1980s a maximum residence time for the boulder is about 25 years, this also means that the soil was at background as well. The purpose of this study is to characterize the transport of uranium series radionuclides from ore to the soil. Transport is characterized by determining the activities of individual radionuclides and daughter to parent ratios. Isotopes of the uranium series decay chain detected include {sup 210}Pb, {sup 234}U, {sup 230}Th, {sup 226}Ra, {sup 214}Pb, and {sup 214}Bi. Peak areas for each isotope are determined using gamma-ray spectroscopy with a Canberra Ge (Li) detector and GENIE 2000 software. The boulder sample is close to secular equilibrium when compared to the standard BL-5 (Beaver Lodge Uraninite from Canada). Results for the soils, however, indicate that some daughter/parent pairs are in secular disequilibrium. These daughter/parent (D/P) ratios include {sup 230}Th/{sup 234}U, which is greater than unity, {sup 226}Ra/{sup 230}Th, which is also greater than unity, and {sup 210}Pb/{sup 214}Bi, which is less than unity. The gamma-ray spectrum for organic material lacks {sup 230}Th peaks, but contains {sup 234}U and {sup 226}Ra, indicating that plants preferentially incorporate {sup 226}Ra. Our results, combined with previous studies require multistage history of mobilization of the uranium series radionuclides. Earlier studies at the ore zone could limit the time span for mobilization only

  12. Geochronology and Fluid-Rock Interaction Associated with the Nopal I Uranium Deposit, Pena Blanca, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    M. Fayek; P. Goodell; M. Ren; A. Simmons

    2005-07-11

    The Nopal I uranium (U) deposit, Pena Blanca District, Mexico, largely consists of secondary U{sup 6+} minerals, which occur within a breccia pipe mainly hosted by the 44 Ma Nopal and Colorados volcanic formations. These two units overly the Pozos conglomerate formation and Cretaceous limestone. Three new vertical diamond drill holes (DDHs) were recently drilled at Nopal I. DDH-PB1 with continuous core was drilled through the Nopal I deposit and two additional DDHs were drilled {approx}50 m on either side of the cored hole. These DDHs terminate 20 m below the current water table, thus allowing the detection of possible gradients in radionuclide contents resulting from transport from the overlying uranium deposit. Primary uraninite within the main ore body is rare and fine-grained ({approx}50 micrometers), thus making geochronology of the Nopal I deposit very difficult. Uranium, lead and oxygen isotopes can be used to study fluid-uraninite interaction, provided that the analyses are obtained on the micro-scale. Secondary ionization mass spectrometry (SIMS) permits in situ measurement of isotopic ratios with a spatial resolution on the scale of a few {micro}m. Preliminary U-Pb results show that uraninite from the main ore body gives an age of 32 {+-} 8 Ma, whereas uraninite from the uraniferous Pozos conglomerate that lies nearly 100 m below the main ore body and 25 meters above the water table, gives a U-Pb age that is <1 Ma. Oxygen isotopic analyses show that uraninite from the ore body has a {delta}{sup 18}O = -10.8{per_thousand}, whereas the uraninite within the Pozos conglomerate has a {delta}{sup 18}O = +1.5{per_thousand}. If it is assumed that both uraninites precipitated from meteoric water ({delta}{sup 18}O = -7{per_thousand}), then calculated precipitation temperatures are 55 C for the uraninite from the ore body and 20 C for uraninite hosted by the Pozos conglomerate. These temperatures are consistent with previous studies that calculated precipitation

  13. Praziquantel, levamisol e diflubenzuron no controle de Dolops carvalhoi (Crustacea: Branchiura e Anacanthorus penilabiatus (Monogenea: Dactylogyridae em Piaractus mesopotamicus Holmberg, 1887 (Osteichthyes: Characidae Praziquantel, levamisole and diflubenzuron in the control of Dolops carvalhoi (Crustacea: Branchiura and Anacanthorus penilabiatus (Monogenea: Dactylogyridae in Piaractus mesopotamicus Holmberg, 1887 (Osteichthyes: Characidae

    Directory of Open Access Journals (Sweden)

    Sergio Henrique Canello Schalch

    2009-03-01

    Full Text Available Neste trabalho, avaliou-se a eficácia antiparasitária do praziquantel, levamisol e diflubenzuron administrados via oral, adicionados à ração, para pacus (Piaractus mesopotamicus infectados por Anacanthorus penilabiatus e Dolops carvalhoi. Foram utilizadas 19 caixas d'água de 300 L de capacidade, comportando 28 peixes cada. Os tratamentos foram feitos misturando os princípios ativos nas dietas. A intensidade parasitária e eficácia foram avaliadas 1 dia antes e 3, 7 e 15 dias após o início da alimentação com ração contendo diflubenzuron, levamisol e praziquantel isolados ou associados em diferentes concentrações por 7 dias. Os resultados da eficácia terapêutica sugerem que, isoladamente ou associado com levamisol e praziquantel, o diflubenzuron é eficiente contra o crustáceo D. carvalhoi, demonstrando que a eficácia dos tratamentos nos dias 3, 7 e 15 variou de 96,2 a 100%. Contra os monogenóides, as drogas não apresentaram eficácia satisfatória. Os resultados sugerem o uso do diflubenzuron para o controle de D. cavalhoi em peixes de cativeiro e em condições de quarentenário.This assay evaluated the control efficacy of diflubenzuron, praziquantel and levamisole added to the diet of pacu (Piaractus mesoptamicus infected with Anacanthorus penilabiatus and Dolops carvalhoi. 19 water tanks of 300 L capacity were utilized with 28 fish in each one. The treatments were made by mixing the active principles in the diet. The experiment was evaluated in four harvests done 1 day before and 3, 7 and 15 days after the treatment. The medicated feeding was applied for 7 days. The results of efficacy suggest that the diflubenzuron alone or associated with levamisole and praziquantel was efficient against the crustacean D. carvalhoi and the efficacy in the 3, 7 and 15 days evaluations ranged from 96,2 to 100%. Against the monogenean the drugs did not present efficacy. The results suggest the use of diflubenzuron for the control of D

  14. Histologia da pele do pacu (Piaractus mesopotamicus e testes de resistência do couro - DOI: 10.4025/actascianimsci.v25i1.2071 Histology of skin of Piaractus mesopotamicus and leather resistance tests - DOI: 10.4025/actascianimsci.v25i1.2071

    Directory of Open Access Journals (Sweden)

    Petra Maria Wagner

    2003-04-01

    Full Text Available Este trabalho analisou a morfologia da pele do pacu, Piaractus mesopotamicus (Holmberg, 1887, e, após curtimento, a resistência do couro. Observou-se que a derme apresenta uma camada superficial com fibras finas, juntas e entrelaçadas, sem diferenciação quanto à disposição das mesmas e uma camada profunda, com fibras mais finas e espaçadas; e à medida que se distanciam da epiderme, os feixes de fibras tornam-se mais espessos, juntos e entrelaçados. A resistência à tração foi significativamente menor no sentido longitudinal (5,93 N/mm2 comparada ao transversal (13,81 N/mm2 em relação ao comprimento do corpo. O valor de alongamento até a ruptura foi superior (p0,05 para rasgamento progressivo. A resistência do couro à tração e alongamento foi superior no sentido transversal ao comprimento do corpo do peixe e não houve diferença para o rasgamento progressivo entre os cortes analisados (transversal e longitudinal. Sendo assim, a média da tração foi 9,87 N/mm2 e 64,59% de elongação, estando dentro dos padrões exigidos para ser utilizado na confecção de vestuário.This work study the histology of skin of Piaractus mesopotamicus (Holmberg, 1887, and after tanning, the leather resistance. Dermis showed a superficial layer with thin, united and interlaced fibers and a inner layer with thinner and spacer fibers. When this layer keeped away from epidermis, the sheaf fibers became thicker, uniter and interlacer. The resistance to tension of body length was significatively inferior in longitudinal sense (5.93 N/mm when compared with transversal sense (13.81 N/mm. The extension value until the rupture was superior (P0.05 to progressive tearing. The leather resistance to tension and extension was higher in transversal sense to body lenght of fish and there wasn’t difference to progressive tearing between the section analysed. Thus, the tension was 9.87 N/mm and 64.59% of elongation that are inside the standard require to

  15. Histopatologia de fígado, rim e baço de piaractus mesopotamicus, prochilodus lineatus e pseudoplatystoma fasciatum parasitados por myxosporídios, capturados no Rio Aquidauana, Mato Grosso do Sul, Brasil Histopathology of liver, kidney and spleen of Piaractus mesopotamicus, Prochilodus lineatus and Pseudoplatystoma fasciatum infected by myxosporean parasite, caugth in Aquidauana River, Mato Grosso do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Cristiane M. de Campos

    2008-12-01

    Full Text Available Este estudo descreveu a histopatologia de rim, baço e fígado de Piaractus mesopotamicus, Prochilodus lineatus e Pseudoplatystoma fasciatum, parasitados por mixosporídios, capturados no Rio Aquidauana, MS. Após necropsia, amostras do fígado, rim cefálico e baço foram colhidas, fixadas em formalina a 10 % tamponada e processadas de acordo com a rotina histológica. Os cortes foram feitos à espessura de 5 μm e corados com hematoxilina-eosina. Foram encontrados Myxobolus porofilus em P. lineatus, M. colossomatis em P. mesopotamicus e Myxobolus spp. nas três espécies de hospedeiros. Cistos de mixosporídios no exame histopatológico foram vistos no fígado e baço de P. mesopotamicus. Mais de 50% das amostras de fígado de P mesopotamicus e P lineatus apresentou hepatodistrofia difusa. Mais de 80 % das amostras de fígado de P. fasciatum apresentou formações hialinas concêntricas e esteatose em 50% das amostras. Em 95,23 % das amostras de rins de P. mesopotamicus, foram observadas alterações teciduais, e em mais de 60 % dos casos nefrodistrofia difusa moderada e congestão de sinusóides glomerulares. Alterações teciduais nas amostras de rins de P. lineatus foram observadas em menos de 20 % da amostra. No baço dos peixes ora examinados não foram encontradas lesões dignas de relato.Histological analysis of kidney, spleen and liver of Piaractus mesopotamicus, Prochilodus lineatus and Pseudoplatystoma fasciatum, infected by myxosporean, caugth in Aquidauana river, MS, was studied. After necropsy, samples of liver, previous kidney and spleen were fixed in 10 % buffered formalin and processed followed histological routine methods. Sections of 5 μm were stained with hematoxylin and eosin. Myxobolusporofilus, M. colossomatis and were found in P. lineatus, in P. mesopotamicus respectively and Myxobolus spp. Were also found in all three species of fish. Myxosporideans cysts in the liver and spleen of P mesopotamicus were also related. Up

  16. Suplementação de lisina e metionina em dietas com baixo nível protéico para o crescimento inicial do pacu, Piaractus mesopotamicus (Holmberg Lysine and methionine supplementation in diets with low protein level for the initial growth of pacu Piaractus mesopotamicus (Holmberg

    Directory of Open Access Journals (Sweden)

    Adriana Patrícia Muñoz-Ramírez

    2002-04-01

    Full Text Available O objetivo deste trabalho foi estudar os efeitos da suplementação de metionina ou lisina em dietas com baixo teor protéico para o crescimento do pacu Piaractus mesopotamicus (Holmberg (Characiformes, Characidae. Foram formuladas uma dieta basal com 22% de proteína bruta (PB, 4100kcal de energia bruta (EB/kg, 0,42% de metionina e 1,16% de lisina e outras 6 dietas, com a mesma formulação básica, suplementadas com 0,2, 0,4 ou 0,6% de metionina ou lisina. Uma 8ª dieta (controle continha 26% PB, 4100kcal EB/kg, 0,48% metionina e 1,43% de lisina. As dietas foram administradas à vontade a 144 alevinos com 14,98 ± 1,16g de peso médio inicial. As médias de ganho em peso, eficiência de retenção de energia bruta e dos consumos alimentares da dieta controle mostraram-se maiores (P The objective of this research was to study the effects of methionine or lysine supplementation in diets with low protein level for growth of pacu Piaractus mesopotamicus (Holmberg (Characiformes, Characidae. Diets were formulated as a basal diet presenting 22% crude protein (CP, 4100 kcal gross energy (GE/kg, 0.42% of methionine and 1.16% of lysine and other six diets, with the same basic formulation, supplemented with 0.2%, 0.4% or 0.6% methionine or lysine. An eighth diet (control contained 26% CP, 4100 kcal (GE/kg, 0.48% methionine and 1.43% of lysine. The diets were administered ad libitum to 144 fingerlings with initial medium weight of 14.98 ± 1.16 g. Averages weight gain, gross energy efficiency retention and feed intake for the control treatment were significantly higher (P < 0.05 than those of smaller protein level diets. Averages protein retention efficiency were only higher (P < 0.01 in the diets supplemented with lysine, showing the advantages of lysine supplementation in diets with low crude protein level. A higher growth of pacu was confirmed with diets containing 26% of CP.

  17. Hematologia de teleósteos brasileiros com infecção parasitária. I. Variáveis do Leporinus macrocephalus Garavelo e Britski, 1988 (Anostomidae e Piaractus mesopotamicus Holmberg, 1887 (Characidae Haematology of parasitized Brazilian teleost fishes. I. Parameters of Leporinus macrocephalus Garavelo and Britski, 1988 (Anostomidae and Piaractus mesopotamicus Holmberg, 1887 (Characidae

    Directory of Open Access Journals (Sweden)

    Dilermando Perecin

    1999-07-01

    Full Text Available Espécimes de Leporinus macrocephalus (piauçu e de Piaractus mesopotamicus (pacu foram colhidos em piscicultura do município de Franca (SP para avaliação dos efeitos da infecção parasitária sobre a taxa de hemoglobina e de hematócrito, a concentração de hemoglobina corpuscular média (CHCM, o fator relativo de condição (Kn e a distribuição percentual de células sangüíneas de defesa orgânica (leucócitos e trombócitos. Ambas as espécies apresentavam-se parasitadas por monogenea ou por monogenea e outros parasitas: monogenea e Trichodina sp; monogenea e Lernaea cyprinacea; monogenea e Piscinoodinium pillulare; monogenea e Ichthyophthirius multifiliis; monogenea, I. multifiliis e Trichodina sp. Os resultados demonstraram que os parâmetros estudados em L. macrocephalus e em P. mesopotamicus não foram significativamente (p > 0,05 alterados pelo parasitismo. A análise de regressão linear mostrou correlação negativa (p > 0,05 entre linfócitos e trombócitos em L. macrocephalus e correlação positiva (p > 0,01 da taxa de hemoglobina com o peso e com o comprimento total em P. mesopotamicus.Specimens of cultivated Leporinus macrocephalus (piauçu and Piaractus mesopotamicus (pacu were collected in a fishfarm at Franca, SP. Effects of parasite infection upon hemoglobin, hematocrit, mean corpuscular hemoglobin concentration (MCHC, condition factor (Kn and differential count of defense cells (leucocyte and thrombocyte were evaluated. Both fish species were parasitized by monogenean; monogenean and Trichodina sp; monogenean and Lernaea cyprinacea; monogenean and Piscinoodinium pillulare; monogenean and Ichthyophthirius miltifiliis; monogenean, I. multifiliis and Trichodina sp. Parasitism did not influence (p > 0.05 the studied haematological characteristics in L. macrocephalus and P. mesopotamicus. Linnear regression showed negative correlation (p > 0.05 between lymphocytes and thrombocytes in L. macrocephalus and positive

  18. Parâmetros sangüíneos de pacu Piaractus mesopotamicus (Holmberg, 1887 alimentados com dietas suplementadas com cromo trivalente em duas densidades de estocagem = Hematological parameters of pacu Piaractus mesopotamicus (Holmberg, 1887 fed diets supplemented with trivalent chromium in two stocking densities

    Directory of Open Access Journals (Sweden)

    Rodrigo Yudi Fujimoto

    2007-10-01

    Full Text Available O objetivo deste trabalho foi avaliar os efeitos da suplementação com cromo trivalente (0, 6, 12 e 18 mg kg-1 de ração sobre as variáveis hematológicas de Piaractus mesopotamicus, mantidos em duas densidades de estocagem (4 e 20 kg m-3. Os mantidos na maior densidade e alimentados com dietas suplementadas com 0 e 6 mg de cromo kg-1apresentaram redução do número de linfócitos circulantes, sugerindo má adaptação a essa condição de alta densidade. Nas dietas suplementadas com 12 e 18 mg kg-1, tal efeito não foi observado, porém verificou-se aumento do número de trombócitos no tratamento com 12 mg de cromo kg-1. A inexistência de diferença significativa entre os tratamentos, aos 30 dias, sugere a adaptação dos peixes ao tipo de alimento e à situação de alta densidade. Portanto, nas condições deste ensaio, a suplementação com 12 e 18 mg de cromo kg-1 é interessante como estratégia alimentar durante 15 dias.This work evaluated the effects of chromium supplementation on thehematological parameters of Piaractus mesopotamicus Holmberg, 1887 maintained in two stocking densities. Fish were fed diets supplemented with 0, 6, 12 and 18 mg trivalent chromium kg-1 dry ration and maintained at 4 and 20 kg m-3. The fish under high stockingdensity and fed diets supplemented with 0 and 6 mg kg-1 showed reduction in the number lymphocytes, which suggests non-adaptation to this condition of high density. This was not observed in fish fed diets supplemented with 12 and 18 mg chromium kg-1, but an increasein the number of thrombocytes was evident. The lack of difference between treatments after 30 days may suggest a possible adaptation of fish to the situation. It can be added that supplementation with 12 and 18 mg chromium kg-1 is an interesting feeding strategy for aperiod of 15 days.

  19. Predation of Piaractus mesopotamicus and Oreochromis niloticus larvae by Pantala flavescens with different length classes - doi: 10.4025/actascibiolsci.v33i4.5470 Predation of Piaractus mesopotamicus and Oreochromis niloticus larvae by Pantala flavescens with different length classes - doi: 10.4025/actascibiolsci.v33i4.5470

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Bento Fernandes

    2011-09-01

    Full Text Available The experiment had as objective to study the survival of Piaractus mesopotamicus and Oreochromis niloticus larvae subject to predation by Pantala flavescens larvae with different length classes. We used 120 larvae of P. mesopotamicus, 120 of O. niloticus, and also 24 larvae of Pantala flavescens, distributed in 24 aquariums with useful volume for 2 L, being placed one Odonate for aquarium. The treatments differed as regard to the prey species and the predator size, being kept a control treatment. An aquarium (2 L containing one larvae of Odonate and 10 larvae of fish were considered an experimental unit. After the beginning, each three hours (18:00, 21:00, 0:00, 3:00, 6:00, 9:00, 12:00, 15:00 and 18:00h, the remnant larvae of fish (alive in each experimental unit was quantified, and we replaced the consumed larvae, so that we always had 10 larvae of fish at each aquarium after each counting. For both fish species, there was a slight increase in consumption by the Odonate with intermediate size, but the values did not differ statistically (p > 0.05. Larvae of Odonate in the treatments with greater length presented a lower consumption (p The experiment had as objective to study the survival of Piaractus mesopotamicus and Oreochromis niloticus larvae subject to predation by Pantala flavescens larvae with different length classes. We used 120 larvae of P. mesopotamicus, 120 of O. niloticus, and also 24 larvae of Pantala flavescens, distributed in 24 aquariums with useful volume for 2 L, being placed one Odonate for aquarium. The treatments differed as regard to the prey species and the predator size, being kept a control treatment. An aquarium (2 L containing one larvae of Odonate and 10 larvae of fish were considered an experimental unit. After the beginning, each three hours (18:00, 21:00, 0:00, 3:00, 6:00, 9:00, 12:00, 15:00 and 18:00h, the remnant larvae of fish (alive in each experimental unit was quantified, and we replaced the consumed larvae

  20. Rendimento do processamento da tilápia do Nilo (Oreochromis niloticus Linnaeus, 1757 e do pacu (Piaractus mesopotamicus Holmberg, 1887 - DOI: 10.4025/actascianimsci.v25i1.2068 Processing yield of Nile tilapia (Oreochromis niloticus Linnaeus, 1757 and pacu (Piaractus mesopotamicus Holmberg, 1887 - DOI: 10.4025/actascianimsci.v25i1.2068

    Directory of Open Access Journals (Sweden)

    Petra Maria Wagner

    2003-04-01

    Full Text Available Analisou-se o rendimento do processamento da tilápia (Oreochromis niloticus e do pacu (Piaractus mesopotamicus, sendo um total de 20 exemplares de cada espécie, com peso médio de 816,0 ± 74,0g e 1958,0 ±164,0g, e comprimento total médio de 33,6 ± 1,1cm e 42,4 ± 1,2cm, respectivamente. Estes foram abatidos por meio de choque térmico, pesados, medidos, eviscerados e filetados. O pacu apresentou um rendimento de filé superior (p It has been analysed the processing yield of Oreochromis niloticus and Piaractus mesopotamicus. A total of 20 individuals from each species, presenting a mean weight of 816,0 ± 74,0g and 1958,0 ± 164,0g, and total length of 33.6 ± 1,1cm and 42.4 ± 1,2cm, respectively, for tilapia and pacu. They were killed with thermical shock, weighed, measured, then extracted internal organs and fillets. The fillet yield was higher in pacu (p < 0,01 than those observed in tilapia. These values for pacu were superior (p < 0.01 to tilapia’s. These values were 51.60% for fillet with skin and 46.73% without skin, while for tilapia they were 39.21% and 36.44%, respectively. There were no significant difference for the yield on the visceral carcass and skin between the two species. The percentage for the tilapia’s head (28.34% was significantly superior (p < 0.01 to pacu’s (16.57%. Individuals with big and long head promoted low fillet yield, as verified for tilapia, and those with small head as pacu, the yield ranges higher values, evidencing the existence of a inverse relationship between the size of the head and fillet yield.

  1. Aerocistite aguda induzida por tioglicolato, lipolisacarídeo e Aeromona hydrophila inativada em Piaractus mesopotamicus: efeitos hematológicos

    Directory of Open Access Journals (Sweden)

    Julieta Rodini Engrácia de Moraes

    2012-10-01

    Full Text Available Os efeitos da injeção de tioglicolato, lipolissacarídio de Escherichia coli e Aeromonas hydrophila inativada na bexiganatatória de pacus, Piaractus mesopotamicus (Characidae foram avaliados quanto às respostas de células vermelhas,leucócitos e trombócitos do sangue. Ensaios quantitativos de eritrócitos, leucócitos e trombócitos foram realizados6, 24 e 48 h após os estímulos e comparados com peixes que receberam solução salina 0,65% pela mesma via. Peixes inoculados com A. hydrophila apresentaram redução do número de eritrócitos e da taxa de hemoglobina enquanto ohematócrito aumentou 6 h após o estímulo. Os resultados mostraram que o tioglicolato e o LPS também induziram redução da hemoglobina e aumento do hematócrito. A contagem de trombócitos diminuiu 6 h após a inoculação deA. hydrophila inativada e aumentou 48 horas após a injeção de LPS. A contagem de leucócitos aumentou 6 h após ainoculação de A. hydrophila enquanto a de linfócitos a leucócitos granulares PAS positivos (PAS_LG diminuiu 24 hdepois. Peixes injetados com tioglicolato o LPS apresentaram aumento do número de LG_PAS em relação aos inoculadoscom A. hydrophila inativada ou grupo controle. A contagem de monócitos não foi afetada pelos diferentes agentes.

  2. Efeito de três diferentes fontes de extrato de pituitárias na indução gonadal em machos e fêmeas de pacu (Piaractus mesopotamicus - DOI: 10.4025/actascianimsci.v27i4.1146 Effects of three different sources of pituitary extract on gonadal inducer in male and female pacu (Piaractus mesopotamicus - DOI: 10.4025/actascianimsci.v27i4.1146

    Directory of Open Access Journals (Sweden)

    Jayme Aparecido Povh

    2005-03-01

    Full Text Available Machos e fêmeas de (Piaractus mesopotamicus foram induzidas com extrato de hipófise de frango de corte (BCPE, coelho (RPE e de carpa (CPE. Os parâmetros vigor espermático, motilidade progressiva, taxa de fertilização e eclosão de acordo com a origem do sêmen, não apresentou diferença (p > 0,05 entre os tratamentos. O tratamento com BCPE produziu o menor volume de sêmen (p 0,05 para o taxa de espermatozóides com anormalidades nos tratamentos, mas as patologias secundárias foram elevadas (p P. mesopotamicusMale and female pacus (Piaractus mesopotamicus were induced with broiler chicken (BCPE, rabbit (RPE, and carp (CPE pituitary extracts. The parameters for spermatic vigor, progressive motility, fertilization and hatching rate, according to semen origin, did not show any differences among the treatments (p > 0.05. RPE produced the lowest (p 0.05 in the total rate of abnormal spermatozoa among the treatments, but the secondary pathologies were higher (p 0.05 between BCPE and CPE were found for accumulated thermal unit, number of oocytes/spawning grams, fertilization and hatchery rates according to treatment origin. The result indicates that BCPE use is recommended for gonadal induction of P. mesopotamicus

  3. Eficiencia del transporte urbano de pasajeros en la localidad de Bahía Blanca, Argentina 2007-2014

    OpenAIRE

    Viego, Valentina; Universidad Nacional del Sur; Volonté, Carolina; Universidad Nacional del Sur,

    2016-01-01

    El objetivo de este artículo es evaluar la eficiencia en la prestación del servicio de transporte urbano por colectivo en la ciudad de Bahía Blanca, Argentina. Las estimaciones se realizaron mediante la aplicación del método de frontera estocástica a una función de producción con datos de panel para el período 2007-2014. Los resultados indican que el nivel medio de eficiencia no varió significativamente durante el período analizado. Asimismo, las transferencias monetarias y la concentración d...

  4. La Blanca, un asentamiento urbano maya en la cuenca del río Mopán

    Directory of Open Access Journals (Sweden)

    Gaspar Muñoz Cosme

    2014-01-01

    Full Text Available El objetivo de este trabajo es presentar los resultados de una investigación realizada recientemente en el asentamiento maya de La Blanca, Guatemala, cuyas características urbanas y arquitectónicas revelan datos significativos de su importancia social y cultural y del papel que jugó en el ámbito de la cuenca del río Mopán. La metodología empleada en esta investigación, así como la puesta en valor de este importante patrimonio cultural, nos ha permitido demostrar cómo, al mismo tiempo, es factible llevar a cabo acciones susceptibles de favorecer el desarrollo social, económico y cultural de las poblaciones vinculadas a sitios arqueológicos como éste.

  5. Urban growth and its impacts on the climate and the society of Bahía Blanca city, Argentina

    Directory of Open Access Journals (Sweden)

    Federico Ferrelli

    2017-01-01

    Full Text Available The aim of this study was to analyze the urban growth of Bahia Blanca city and its impacts on the microclimate considering its inhabitants perception. LANDSAT satellite images were processed for the period 1984-2014. The urban area, the temperature and the biomass was estimated. Temperature, relative humidity and wind speed from the Servicio Meteorologico Nacional (Argentina were analyzed. The growth of the city has reduced the biomass. The LST decreased 0.6 ºC due to the increasing of shadows generated by buildings and the heat capacity of their materials. The opinion of the citizen corresponded with the meteorological data analyzed. Consultations with stakeholders generated useful information to guide city planning, public policy and decision making to improve the inhabitants’ quality of life.

  6. Archaeometric study of ceramic figurines from the Maya settlement of La Blanca (Petén, Guatemala)

    Science.gov (United States)

    Horcajada, P.; Roldán, C.; Vidal, C.; Rodenas, I.; Carballo, J.; Murcia, S.; Juanes, D.

    2014-04-01

    In this article, analytical results will be presented and discussed regarding a selected set of figurines from the ancient Maya settlement of La Blanca in Petén, Guatemala. The objective is to characterize the ceramic material by two analytical complementary techniques: X-ray diffraction (XRD) and total reflection X-ray fluorescence (TXRF). The data obtained by means of both XRD and TXRF were compared and analyzed by multivariate statistical techniques in order to obtain sample groups according to their chemical composition. The results of this archaeometric study have been compared to those that have been obtained through macroscopic characterization by means of the traditional classification system know as Type-Variety. Discordances have been found between the clusters obtained by the Type-Variety classification system and the multivariate classification procedures performed on analytical data.

  7. Towards a GLOF hazard map for the city of Huaraz, Cordillera Blanca, Peru

    Science.gov (United States)

    Frey, Holger; Huggel, Christian; E Chisolm, Rachel; Gonzales, César; Cochachin, Alejo; Portocarrero, César

    2017-04-01

    Huaraz, with 120,000 inhabitants, is the largest city at the foot of the Cordillera Blanca Mountain Range, Peru, and is located at the confluence of the Quillcay River with the main Santa River. Three moraine dammed glacier lakes are located in the headwaters of the Quillcay catchment, which pose a potential threat of glacier lake outburst floods (GLOFs) to Huaraz: Laguna Cuchillacocha (2.5 x 106 m3), Laguna Tullparaju (12 x 106 m3), and Laguna Palcacocha (17 x 106 m3). The latter burst out in 1941, causing one of the deadliest GLOFs known in history, with about 2000 casualties and destroying a third of the city of Huaraz. Currently, the presence of these lakes within potential runout distances of possibly very large ice or rock/ice-avalanches, combined with the large damage potential in the city of Huaraz, some 20 km downstream of the lakes and further potentially endangered infrastructures such as the city of Trujillo, large-scale irrigation projects and hydropower plants along the Santa River poses a high-risk situation, despite lake safety systems at all three lakes were constructed in the last century. At Laguna Palcacocha, temporary measures, such as syphoning and a permanent supervision by a team of observers are undertaken at Laguna Palcacocha. For the future, more permanent measures are planned, including non-structural measures, such as a sensor-based early warning system for the entire catchment. In this framework, a preliminary GLOF hazard map for the entire Quillcay catchment has been developed, based on physically-based numerical modeling. For each of the three lakes, three scenarios of different magnitudes and related probabilities were modeled. For each case, a series of models was used to simulate each part of the chain of interacting processes. The eventual GLOFs were simulated with FLO2D for Palcacocha and RAMMS for Tullparaju and Cuchillacocha. Small, medium and large scenarios were merged for all three lakes, in order to come up with a single

  8. Modeling of U-series Radionuclide Transport Through Soil at Pena Blanca, Chihuahua, Mexico

    Science.gov (United States)

    Pekar, K. E.; Goodell, P. C.; Walton, J. C.; Anthony, E. Y.; Ren, M.

    2007-05-01

    The Nopal I uranium deposit is located at Pena Blanca in Chihuahua, Mexico. Mining of high-grade uranium ore occurred in the early 1980s, with the ore stockpiled nearby. The stockpile was mostly cleared in the 1990s; however, some of the high-grade boulders have remained there, creating localized sources of radioactivity for a period of 25-30 years. This provides a unique opportunity to study radionuclide transport, because the study area did not have any uranium contamination predating the stockpile in the 1980s. One high-grade boulder was selected for study based upon its shape, location, and high activity. The presumed drip-line off of the boulder was marked, samples from the boulder surface were taken, and then the boulder was moved several feet away. Soil samples were taken from directly beneath the boulder, around the drip-line, and down slope. Eight of these samples were collected in a vertical profile directly beneath the boulder. Visible flakes of boulder material were removed from the surficial soil samples, because they would have higher concentrations of U-series radionuclides and cause the activities in the soil samples to be excessively high. The vertical sampling profile used 2-inch thicknesses for each sample. The soil samples were packaged into thin plastic containers to minimize the attenuation and to standardize sample geometry, and then they were analyzed by gamma-ray spectroscopy with a Ge(Li) detector for Th-234, Pa-234, U-234, Th-230, Ra-226, Pb-214, Bi-214, and Pb-210. The raw counts were corrected for self-attenuation and normalized using BL-5, a uranium standard from Beaverlodge, Saskatchewan. BL-5 allowed the counts obtained on the Ge(Li) to be referenced to a known concentration or activity, which was then applied to the soil unknowns for a reliable calculation of their concentrations. Gamma ray spectra of five soil samples from the vertical profile exhibit decreasing activities with increasing depth for the selected radionuclides

  9. Propuesta para la pacificación del tráfico en la Ciudad Blanca, Universidad Nacional de Colombia, Bogotá D.C.

    Directory of Open Access Journals (Sweden)

    Saúl Ojeda Gómez

    2000-07-01

    Full Text Available La Ciudad Blanca, o Ciudad Universitaria, como se la conoce desde tiempo atrás registra hechos de accidentalidad de tránsito que inquietan a su comunidad de estudiantes, docentes y empleados, dada las consecuencias que tales hechos acarrean a quienes en ella conviven a diario. Este artículo considera en primer lugar la situación aludida atrás, a la luz de la información suministrada al respecto por la división de Vigilancia y Seguridad de la Universidad. A continuación se intenta una aproximación a la causalidad presente en dicha situación y, por ultimo se presenta una propuesta de trabajo interfacultades, orientada a la pacificación del tráfico dentro de la Ciudad Blanca.

  10. Food restriction increase the expression of mTORC1 complex genes in the skeletal muscle of juvenile pacu (Piaractus mesopotamicus)

    Science.gov (United States)

    de Paula, Tassiana Gutierrez; Zanella, Bruna Tereza Thomazini; Fantinatti, Bruno Evaristo de Almeida; de Moraes, Leonardo Nazário; Duran, Bruno Oliveira da Silva; de Oliveira, Caroline Bredariol; Salomão, Rondinelle Artur Simões; da Silva, Rafaela Nunes; Padovani, Carlos Roberto; dos Santos, Vander Bruno; Mareco, Edson Assunção; Carvalho, Robson Francisco; Dal-Pai-Silva, Maeli

    2017-01-01

    Skeletal muscle is capable of phenotypic adaptation to environmental factors, such as nutrient availability, by altering the balance between muscle catabolism and anabolism that in turn coordinates muscle growth. Small noncoding RNAs, known as microRNAs (miRNAs), repress the expression of target mRNAs, and many studies have demonstrated that miRNAs regulate the mRNAs of catabolic and anabolic genes. We evaluated muscle morphology, gene expression of components involved in catabolism, anabolism and energetic metabolism and miRNAs expression in both the fast and slow muscle of juvenile pacu (Piaractus mesopotamicus) during food restriction and refeeding. Our analysis revealed that short periods of food restriction followed by refeeding predominantly affected fast muscle, with changes in muscle fiber diameter and miRNAs expression. There was an increase in the mRNA levels of catabolic pathways components (FBXO25, ATG12, BCL2) and energetic metabolism-related genes (PGC1α and SDHA), together with a decrease in PPARβ/δ mRNA levels. Interestingly, an increase in mRNA levels of anabolic genes (PI3K and mTORC1 complex: mTOR, mLST8 and RAPTOR) was also observed during food restriction. After refeeding, muscle morphology showed similar patterns of the control group; the majority of genes were slightly up- or down-regulated in fast and slow muscle, respectively; the levels of all miRNAs increased in fast muscle and some of them decreased in slow muscle. Our findings demonstrated that a short period of food restriction in juvenile pacu had a considerable impact on fast muscle, increasing the expression of anabolic (PI3K and mTORC1 complex: mTOR, mLST8 and RAPTOR) and energetic metabolism genes. The miRNAs (miR-1, miR-206, miR-199 and miR-23a) were more expressed during refeeding and while their target genes (IGF-1, mTOR, PGC1α and MAFbx), presented a decreased expression. The alterations in mTORC1 complex observed during fasting may have influenced the rates of protein

  11. Food restriction increase the expression of mTORC1 complex genes in the skeletal muscle of juvenile pacu (Piaractus mesopotamicus.

    Directory of Open Access Journals (Sweden)

    Tassiana Gutierrez de Paula

    Full Text Available Skeletal muscle is capable of phenotypic adaptation to environmental factors, such as nutrient availability, by altering the balance between muscle catabolism and anabolism that in turn coordinates muscle growth. Small noncoding RNAs, known as microRNAs (miRNAs, repress the expression of target mRNAs, and many studies have demonstrated that miRNAs regulate the mRNAs of catabolic and anabolic genes. We evaluated muscle morphology, gene expression of components involved in catabolism, anabolism and energetic metabolism and miRNAs expression in both the fast and slow muscle of juvenile pacu (Piaractus mesopotamicus during food restriction and refeeding. Our analysis revealed that short periods of food restriction followed by refeeding predominantly affected fast muscle, with changes in muscle fiber diameter and miRNAs expression. There was an increase in the mRNA levels of catabolic pathways components (FBXO25, ATG12, BCL2 and energetic metabolism-related genes (PGC1α and SDHA, together with a decrease in PPARβ/δ mRNA levels. Interestingly, an increase in mRNA levels of anabolic genes (PI3K and mTORC1 complex: mTOR, mLST8 and RAPTOR was also observed during food restriction. After refeeding, muscle morphology showed similar patterns of the control group; the majority of genes were slightly up- or down-regulated in fast and slow muscle, respectively; the levels of all miRNAs increased in fast muscle and some of them decreased in slow muscle. Our findings demonstrated that a short period of food restriction in juvenile pacu had a considerable impact on fast muscle, increasing the expression of anabolic (PI3K and mTORC1 complex: mTOR, mLST8 and RAPTOR and energetic metabolism genes. The miRNAs (miR-1, miR-206, miR-199 and miR-23a were more expressed during refeeding and while their target genes (IGF-1, mTOR, PGC1α and MAFbx, presented a decreased expression. The alterations in mTORC1 complex observed during fasting may have influenced the rates of

  12. Differential expression of myogenic regulatory factor MyoD in pacu skeletal muscle (Piaractus mesopotamicus Holmberg 1887: Serrasalminae, Characidae, Teleostei) during juvenile and adult growth phases.

    Science.gov (United States)

    de Almeida, Fernanda Losi Alves; Carvalho, Robson Francisco; Pinhal, Danillo; Padovani, Carlos Roberto; Martins, Cesar; Dal Pai-Silva, Maeli

    2008-12-01

    Skeletal muscle is the edible part of the fish. It grows by hypertrophy and hyperplasia, events regulated by differential expression of myogenic regulatory factors (MRFs). The study of muscle growth mechanisms in fish is very important in fish farming development. Pacu (Piaractus mesopotamicus) is one of the most important food species farmed in Brazil and has been extensively used in Brazilian aquaculture programs. The aim of this study was to analyze hyperplasia and hypertrophy and the MRF MyoD expression pattern in skeletal muscle of pacu (P. mesopotamicus) during juvenile and adult growth stages. Juvenile (n=5) and adult (n=5) fish were anaesthetized, sacrificed, and weight (g) and total length (cm) determined. White dorsal region muscle samples were collected and immersed in liquid nitrogen. Transverse sections (10 microm thick) were stained with Haematoxilin-Eosin (HE) for morphological and morphometric analysis. Smallest fiber diameter from 100 muscle fibers per animal was calculated in each growth phase. These fibers were grouped into three classes (50 microm) to evaluate hypertrophy and hyperplasia in white skeletal muscle. MyoD gene expression was determined by semi-quantitative RT-PCR. PCR products were cloned and sequenced. Juvenile and adult pacu skeletal muscle had similar morphology. The large number of <20 microm diameter muscle fibers observed in juvenile fish confirms active hyperplasia. In adult fish, most fibers were over 50 microm diameter and denote more intense muscle fiber hypertrophy. The MyoD mRNA level in juveniles was higher than in adults. A consensus partial sequence for MyoD gene (338 base pairs) was obtained. The Pacu MyoD nucleotide sequence displayed high similarity among several vertebrates, including teleosts. The differential MyoD gene expression observed in pacu white muscle is possibly related to differences in growth patterns during the phases analyzed, with hyperplasia predominant in juveniles and hypertrophy in adult fish

  13. [Nutritional characterization of produced fish for human consumption in Bucaramanga, Colombia].

    Science.gov (United States)

    Perea, Aide; Gómez, Elieth; Mayorga, Yamile; Triana, Cora Yohanna

    2008-03-01

    This research involves the nutritional characterization of the most commonly cultivated fish in the region. The species under study were: Rainbow trout (Salmo gairdnerii), tilapia roja (Oreocliromis sp), cachama blanca (Piaractus brachypomus), bocachico (Prochilodus reticulatus magdalenae) and catfish (Pseudoplatystoma faciatum). A sea fish, coho Salmon (Oncorhynchus kisutch), was used as reference because it is the imported species most used in the region, and it also contains n-3 fatty acids. For each fish sample moisture, ash, protein content, total fat, minerals (iron, calcium and phosphorous) and a fatty acid profile were determined. Results show a total protein content in between 16.4 and 22.6 g/100 g fillet for fresh water fish. Total fat amounts for trout are the highest (8.1 g/100 g fillet), while catfish has the lowest fat content (0.4 g/100 g fillet). Trout was found to be the most important source of n-3 fatty acids (EPA+DHA) and phosphorous, with values ranging from 0.25% to 0.52%, and 250 to 346 mg/100 g fillet, respectively. Catfish and trout exhibited the highest iron content, with values ranging from 3 to 6mg/100 g fillet. Salmon, on the other hand, showed a high n-3 fatty acid content of 1.16% to 2.25%, when compared to fresh water fish. Calcium content is low in all species under scrutiny. Fresh water fish, other than trout, show no significant amount of n-3 fatty acids. However, all of them are a good source of protein. The obtained results allowed to determine the profile of oily acids of produced fish for human consumption in the region, demonstrating that the trout is the species with major quantity of oily acids n-3 specially DHA and of the minerals the phosphorus. Other species (kinds) catfish, bocachico, tilapia and cachama, are not a source of oily acids n-3, but they are an important source of protein.

  14. Búsqueda de los sitios de observación del tránsito de Venus de 1882 en territorio argentino. II. Bahía Blanca

    Science.gov (United States)

    Milesi, G. E.; Vázquez, R. A.

    We present here the results of an investigation that allowed us to determine the precise site of the Temporary Astronomical Station; settled in the city of Bahia Blanca; Provincia de Buenos Aires; in order to observe the transit of Venus in front of the solar disk on 6 December 1882. Our work sets the geographical coordinates of the station and clears up some confusion about its true location. FULL TEXT IN SPANISH

  15. Eficacia de diferentes diodos emisores de luz (LEDs unidos a trampas adhesivas amarillas para la captura de la mosca blanca Trialeurodes vaporariorum

    Directory of Open Access Journals (Sweden)

    Jorge Eduardo Castresana

    2015-12-01

    Full Text Available Teniendo en cuenta que algunos adultos de insectos muestran preferencia a ciertas longitudes de onda, se ha considerado este comportamiento para desarrollar herramientas de monitoreo y estrategias de control de insectos plaga. Como ejemplo de ello, las tarjetas adhesivas amarillas han sido ampliamente usadas para monitorear población de moscas blancas a campo como invernadero. Este estudio tuvo como objetivo evaluar la efectividad de trampas adhesivas amarillas provistas con luces emitidas por diodos (LEDs para el trampeo de adultos moscas blancas Trialeurodes vaporariorum (Westwood (Hemiptera: Aleyrodidae. Los ensayos se llevaron a cabo en la EEA INTA Concordia en condiciones de umbráculo, donde se ubicaron jaulas de cría con plantas de tabaco, Solanum tabacum (L. y poroto, Phaseolus vulgaris (L. desde Junio hasta Julio del 2013. Las trampas adhesivas amarillas tuvieron una superficie de 64cm2 provistas con (LEDs de diferentes longitudes de onda promedio (525 nm verde y 380 nm UV y sin LED como testigo. Los ensayos mostraron que los adultos de mosca blanca fueron significativamente (α >0.05 más atraídos por las trampas equipadas con LED 525 nm verde (134 ± 7.4 adultos/tarjeta comparadas con trampas equipadas con LED 380 nm UV (105 ± 7.4 adultos/tarjeta y trampas sin LED (85.17 ± 7.4 adultos/tarjeta. Estos resultados muestran que los adultos de T. vaporariorum son atraídos a trampas dotadas con LED verde, las cuales podrían tener un promisorio uso en invernadero como detección, monitoreo y control de mosca blanca.

  16. Eficacia de diferentes diodos emisores de luz (LEDs) unidos a trampas adhesivas amarillas para la captura de la mosca blanca Trialeurodes vaporariorum

    OpenAIRE

    Jorge Eduardo Castresana; Laura Elena Puhl

    2015-01-01

    Teniendo en cuenta que algunos adultos de insectos muestran preferencia a ciertas longitudes de onda, se ha considerado este comportamiento para desarrollar herramientas de monitoreo y estrategias de control de insectos plaga. Como ejemplo de ello, las tarjetas adhesivas amarillas han sido ampliamente usadas para monitorear población de moscas blancas a campo como invernadero. Este estudio tuvo como objetivo evaluar la efectividad de trampas adhesivas amarillas provistas con luces emitidas po...

  17. GAMMA-RAY CHARACTERIZATION OF THE U-SERIES INTERMEDIATE DAUGHTERS FROM SOIL SAMPLES AT THE PENA BLANCA NATURAL ANALOG, CHIHUAHUA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    D.C. French; E.Y. Anthony; P.C. Goodell

    2005-07-18

    The Pena Blanca natural analog is located in the Sierra Pena Blanca, approximately 50 miles north of Chihuahua City, Mexico. The Sierra Pena Blanca is composed mainly of ash-flow tuffs, and the uranium in the region is contained in the brecciated zones of these tuffs. The Pena Blanca site is considered a natural analog to the proposed Yucca Mountain Nuclear Waste Repository because they share similar characteristics of structure, volcanic lithology, tectonic activity, and hydrologic regime. One of the mineralized zones, the Nopal I deposit, was mined in the early 1980s and the ore was stockpiled close to the mine. This stockpile area has subsequently been cleared and is referred to as the prior high-grade stockpile (PHGS) site. Soil surrounding boulders of high-grade ore associated with the PHGS site have been sampled. The purpose of this study is to characterize the transport of uranium series radioisotopes from the boulder to the soil during the past 25 years. Transport is characterized by determining the activities of individual radionuclides and daughter to parent ratios. The daughter to parent ratios are used to establish whether the samples are in secular equilibrium. Activities are determined using gamma-ray spectroscopy. Isotopes of the uranium series decay chain detected by gamma-ray spectroscopy include {sup 210}Pb, {sup 234}U, {sup 234}Th, {sup 230}Th, {sup 226}Ra, {sup 214}Pb, {sup 214}Bi, and {sup 234}Pa. Preliminary results indicate that some daughter to parent pairs appear to be in secular disequilibrium. Thorium is in excess relative to uranium, and radium is in excess relative to thorium. A deficiency appears to exist for {sup 210}Pb relative to {sup 214}Bi and {sup 214}Pb. If these results are borne out by further analysis, they would suggest transport of nuclides from the high-grade boulder into its surroundings, followed by continued leaching of uranium and lead from the environment.

  18. Análisis preliminares de los materiales líticos provenientes de la Laguna Blanca Chica (Olavarría, Buenos Aires)

    OpenAIRE

    Messineo, Pablo G.; D’Augerot, Lázaro

    2017-01-01

    En este trabajo se presentan los resultados preliminares sobre el estudio de los materiales líticos recuperado en la Laguna Blanca Chica (Partido de Olavarría, Provincia de Buenos Aires). El objetivo principal es conocer las estrategias relacionadas al aprovisionamiento y explotación de las materias primas presentes, como los procesos tecnológicos utilizados sobre las mismas. Los resultados obtenidos indican que la ftanita (55,58%) y la cuarcita (43,23%...

  19. Calidad de plántula en cinco cultivares de papa determinada por la intensidad de luz blanca y tipo de propagación

    Directory of Open Access Journals (Sweden)

    Delfina de Jesús Pérez López

    2013-01-01

    Full Text Available Se realiza una evaluación del crecimiento de plántulas de cinco cultivares de papa, propagadas a partir de esquejes de ápices y de medios en presencia de luz blanca, para determinar la calidad de la plántula. Los cultivares Atlantic y Fianna presentaron una mayor adaptación al Sistema Hidropónico debido a un mayor grosor de tallo y a la presencia de abundante raíz; el clon fl-1867 presentó el mayor número de nudos y en calidad de raíz fue sobresaliente. El efecto de la luz blanca no favoreció la altura de la planta y número de nudos. La luz blanca a 6 000 y 5 000 luxes contribuyó a un grosor de tallo de 1.24 y 1.23 mm, cumpliendo con los estándares de calidad para el laboratorio.

  20. Comparación entre mujeres blancas y negras víctimas de la violencia de pareja en el nordeste de Brasil

    Directory of Open Access Journals (Sweden)

    Nazaré Costa

    2009-01-01

    Full Text Available El objetivo de este estudio fue comparar los casos de mujeres blancas y negras víctimas de la violencia de pareja en el nordeste de Brasil, así como determinar las diferencias de abuso dentro del marco de una relación de pareja en función de diversas variables sociodemográficas. Una muestra de 386 mujeres (183 blancas y 203 negras con relación de pareja heterosexual desde hacía al menos seis meses contestó al Index of Spouse Abuse. Los resultados encontrados permiten concluir que las mujeres de raza negra sufren más abusos en su relación de pareja que las blancas, y que la edad, el nivel educativo, la ocupación, la práctica religiosa y la ideología política no se relacionan con la frecuencia de abuso físico y no físico.

  1. Macrobentos del área de Bahía Blanca (Argentina, distribución espacial de la fauna Macrobentos in the area of Bahia Blanca (Argentina, spatial distribution of the of the fauna

    Directory of Open Access Journals (Sweden)

    Claudia Silvia Bremec

    1990-12-01

    Full Text Available Entre setembro de 1982 e agosto de 1983, foram realizados levantamentos mensais do bentos da Bahía Blanca, na área compreendida entre 038º30'-039º25'S e 61º15'-63º00'W, aproximadamente, provincia de Buenos Aires, Argentina. A macrofauna e os sedimentos foram amostrados, respectivamente, com dragas biológicas (cf. Holmes, 1971. A granulometria do sedimento foi determinada de acordo com Krumbein & Pettijohn (1938, sendo determinados o diámetro médio (Mz ø e o coeficiente de seleção das partículas (S ø, segundo Folk & Ward (1957. As dominancias quantitativas (DI e os graus de presença (Bouderesque, 1971 foram calculados a partir dos dados biológicos. Análise de grupamento foi aplicada usando o coeficiente de Jaccard e as técnicas UPGMA (Sokal & Sneath, 1963; Stirn, 1981. São feitas referências a distribuição espacial e a composição da macrofauna bêntica, relacionando-as às características granulométricas do sedimento. A área amostrada foi caracterizada de acordo com a dominancia de espécies, relativa às suas flutuações espaciais e estacionais. A correspondência entre espécies muito abundantes e as características granulométricas do fundo aparece relacionada aos hábitos alimentares. Foi constatado um aumento gradual de comedores de depósito nos sedimentos lodosos.The present paper refers to the results ofbenthic surveys carried out between September 1982 and August 1983 in the area of Bahfa Blanca, province of Buenos Aires, Argentina. They include the composition and spatial distribution of the macrofauna, related to the granulometric characteristics of the sediments. The area was characterized by dominance of species, in spite of spatial and seasonal fluctuations. The correspondence between many abundant species and the granulometric characteristics of the bottom is related to their feeding habits. A gradual increase of deposit feeders in muddy sediments was observed.

  2. Alterações hematológicas e histopatológicas em pacu, Piaractus mesopotamicus Holmberg, 1887 (Osteichthyes, Characidae, Hematological and histopathological alteration in pacu Piaractus mesopotamicus Holmberg, 1887 (Osteichthyes, Characidae after treatment with copper sulphate (CuSO4

    Directory of Open Access Journals (Sweden)

    Flávio Ruas de Moraes

    2002-05-01

    Full Text Available Este trabalho avaliou os valores hematológicos e glicêmicos e histopatologia de Piaractus mesopotamicus (Osteichthyes, Characidae infectados com Monogenea Anacanthorus penilabiatus Boeger, Husak & Martins, 1995 (Dactylogyridae após tratamento com 0,50 mg/L e 1,00 mg/L de sulfato de cobre (CuSO4. A eficiência da droga sobre as infecções com Monogenea foi observada no primeiro dia após administração mas não após 8, 15 ou 30 dias do tratamento. As análises histopatológicas mostraram hiperplasia do epitélio e alterações circulatórias nas brânquias. No primeiro dia após tratamento, foram observadas alterações significativas (P4 mostraram redução da taxa de hemoglobina e do percentual de neutrófilos. No 8o dia do tratamento a dose de 1,00 mg/L provocou aumento da glicemia mas redução no percentual de linfócitos quando comparada com 0,50 mg/L. No 15o dia após tratamento com 1,00 mg/L os valores médios do volume corpuscular médio e o percentual de células granulocíticas especiais (C.G.E. decresceram mas o número de leucócitos totais aumentaram. No 30o dia após tratamento com 0,50 mg/L de sulfato de cobre houve aumento de C.G.E. e no tratamento com 1,00 mg/L o aumento foi de linfócitos.This paper evaluated the haematological and glycaemic parameters in Piaractus mesopotamicus (Osteichthyes, Characidae infected with Monogenea Anacanthorus penilabiatus Boeger, Husak & Martins, 1995 (Dactylogyridae after treatment with 0.50 mg/L and 1.00 mg/L of copper sulphate (CuSO4. The efficacy of the CuSO4 was observed in the first day after administration but not after eight, fifteen or thirty days. The histopathological analyses showed hyperplasia of the epithelium and circulatory changes in the gills. In the first day after treatment significant changes (Pth day. Fifteen days after 1.00 mg/L treatment, values of mean corpuscular volume (MCV and special granulocitic cells (S.G.C. percentage decreased. Nevertheless, increase of

  3. Relação parasito-hospedeiro em peixes de pisciculturas da região de Assis, Estado de São Paulo, Brasil. 2. Piaractus mesopotamicus (Holmberg, 1887 = Host-parasite relationship of fishes from fish farm in Assis region, São Paulo State, Brazil. 2. Piaractus mesopotamicus (Holmberg, 1887

    Directory of Open Access Journals (Sweden)

    Maria de los Angeles Perez Lizama

    2007-10-01

    Full Text Available Piaractus mesopotamicus (Holmberg, 1887 é uma das espécies nativas mais difundidas em pisciculturas no Brasil. Este estudo foi realizado em três pisciculturas do Estado de São Paulo, durante os meses de fevereiro a dezembro de 2004. Oitenta e três espécimes (92,2% estavamparasitados por pelo menos uma espécie de parasito. Oito espécies de ectoparasitos foram registradas. Anacanthorus penilabiatus, A. spatulathus e Mymarothecium sp. 2 foram classificadas como centrais, e Mymarothecium sp. 1, secundária. As demais foram consideradas satélites. Foi possível evidenciar que, apesar de as espécies serem altamente prevalentes, poucas delas foram abundantes. Anacanthorus penilabiatus apresentou correlação negativa e significativa entre a abundância de parasitismo e o comprimento-padrão do hospedeiro, na propriedade do município de Tarumã, Estado de São Paulo. Mymarothecium sp. 2 apresentou correlação positiva significativa na piscicultura de Cândido Mota, Estado de São Paulo. Neste estudo, os resultados do fator de condição relativo demonstram que somente na propriedade de Palmital, Estado de São Paulo, ocorreu correlaçãosignificativa entre o Kn e a abundância de parasitismo para algumas espécies. Anacanthorus penilabiatus e A. spatulathus apresentaram-se correlacionadas positivamente com a relação hepatossomática naspisciculturas dos municípios de Tarumã e Cândido Mota, Estado de São Paulo. Em se tratando da relação esplenossomática, somente a espécie de ergasilídeo apresentou-se negativa e significativamente correlacionada em Cândido Mota, Estado de São Paulo.Piaractus mesopotamicus (Holmberg, 1887 is one of the most abundant native species in fish farmings in Brazil. This study was conducted in three fish farmings in São Paulo State, during February and December, 2004. Eighty-three specimens (92.2% were parasitized by at least one parasite species. Eight species of ectoparasites were registered

  4. Processamento da carne do pacu (Piaractus mesopotamicus cultivado em tanques-rede no reservatório de Itaipu - DOI: 10.4025/actascianimsci.v29i4.1018 Processing of pacu (Piaractus mesopotamicus meat from net cage farming in the Itaipu reservoir - DOI: 10.4025/actascianimsci.v29i4.1018

    Directory of Open Access Journals (Sweden)

    Beatriz Cristina Bencke

    2008-03-01

    Full Text Available O trabalho objetivou avaliar as características morfométricas, bromatológicas e o rendimento de cortes da carne do pacu (Piaractus mesopotamicus, cultivados em tanques-rede. Utilizaram-se 45 animais, distribuídos em três tratamentos e 15 repetições cada uma. Os tratamentos constituíram-se de animais alimentados com ração extrusada comercial (REC, resíduos de vegetal cozido (RPV e resíduos cozidos de produção pesqueira (RPP. Realizaram-se as medidas individuais dos animais de comprimento-padrão (CP, comprimento total (CT, comprimento da cabeça (CC, altura da cabeça (AC, largura do tronco (LT, comprimento do tronco (CTR, altura do tronco (AT e, a partir delas, avaliaram-se as relações morfométricas de CC/CP, CC/AC, CP/CT, LT/CTR, LT/AT e AT/CTR. Avaliaram-se os rendimentos: carcaça (RCARC, tronco limpo (TL, musculatura dorsal (MD, filé (FL, costelas (COST, nadadeiras (NAD, gordura visceral (GVISC, pele com escamas (PELE, e os teores de umidade (UM, matéria mineral (MM, proteína bruta (PB e extrato etéreo (EE dos diferentes cortes. Observaram-se maiores resultados (p This work was carried out to evalue the morphometric and chemical characteristics, as well as the meat cut yields from pacu (Piaractus mesopotamicus reared in net cages. Forty-five specimens were used, distributed in three treatments and 15 replications. The treatments consisted of animals fed with commercial extruded ration (CER, vegetal by-products (VBP and fishery by-products (FBP. Individual morphometric characteristics were measures in terms of standard length (SL, total length (TL, head length (HL head height (HH, body width (BW, body lenght (BL, body height (BH, to evaluate the morphometric ratio of HL/SL, HL/HH, SL/TL, BW/BL, BW/BH and BH/BL. Next, the carcass (CARC, clean body (CB, dorsal muscle (DM, fillet (FL, ribs (RIB, fin (FIN, visceral fat (VISCF, skin with scales (SKIN, as well as the levels of moisture (M, ash (ASH, crude protein (CPB and fat

  5. Influência de diferentes níveis de vitamina C na ração sobre parâmetros hematológicos de alevinos de Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae Influence of different levels of vitamin C in the ration on the haematological parameters of Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae fries

    Directory of Open Access Journals (Sweden)

    Maurício Laterça Martins

    1995-09-01

    Full Text Available Haematological changes in ascorbic acid deficient fishes, observed by some authors, awoked the interest in the haematological response of pacu, Piaractus mesopotamicus. The present work studied the influence of different levels of ascorbic acid (vitamin C in the ration on the haematological parameters of pacu. Fishes at the beginning of the experiment, presented average body weight 8.64±1.62g and 6.15±0.33cm standard length, were fed with diets containing 0. 50, 100 and 200mg ascorbic acid/kg dry ration. The present work was developed for a period of 24 weeks at the Fish Nutrition Laboratory of Aquaculture Center of Universidade Estadual Paulista (Unesp, Jaboticabal (São Paulo. The fishes were distributed by the completely randomized design in 20 aquaria of 100 liters capacity with six animals in each and five fold treatment. Condutivity, alcalinity. pH and oxigen were measured weekly and temperature daily. The blood colect was done in 60 anesthetized fishes with 50mg MS-222/1. The results suggests that 50mg ascorbic acid/kg dry ration improved the mean corpuscular volume, mean corpuscular haemoglobin, mean corpuscular haemoglobin concentration and decreased haematocril in unsupplemented fishes, although not differing significantly (P>0.05. The erytrocyte diameter indicated the presence of macrocytic cells in unsupplemented fishes (P<0.05 and the regression analysis showed too reduced neutrophils in unsupplemenled ones, 50mg ascorbic acid/kg dry ration supplementation was enough to development and haematological responses. Furthtermore, the optimum level to the growth is 139mg vitamin C/kg dry ration (P<0.05.

  6. Insectos acuáticos y calidad del agua en la cuenca y embalse del río Peñas Blancas, Costa Rica

    Directory of Open Access Journals (Sweden)

    Meyer Guevara Mora

    2011-06-01

    Full Text Available La población de insectos acuáticos y la calidad del agua fueron caracterizadas tomando en cuenta las alteraciones humanas y naturales en el área de estudio. Durante los muestreos mensuales, el pH, OD, temperatura, nivel del agua, DBO, PO4 y NO3 fueron medidos. Los índices biológicos (abundancia, riqueza de especies y el BMWP-CR se evaluaron para determinar la calidad del agua. No se detectaron relaciones entre las variables ambientales y los insectos acuáticos, pero las diferencias espaciales y temporales en la abundancia y riqueza fueron asociadas con las crecidas del río (temporal y a la presencia del embalse Peñas Blancas (espacial. En el futuro las investigaciones en la cuenca Peñas Blancas deben de ser dirigidas a determinar la magnitud de la influencia de los caudales, liberación de sedimentos y la posible degradación de la calidad del agua por efluentes de aguas servidas que se lleguen a ubicar en la cuenca.Aquatic insects and water quality in Peñas Blancas watershed and reservoir. The aquatic insects have been used to evaluate water quality of aquatic environments. The population of aquatic insects and the water quality of the area were characterized according to the natural and human alterations present in the study site. During the monthly-survey, pH, DO, temperature, water level, DBO, PO4 and NO3 were measured. Biological indexes (abundance, species richness and the BMWP-CR were used to evaluate the water quality. No relation between environmental and aquatic insects was detected. Temporal and spatial differences attributed to the flow events (temporal and the presence of Peñas Blancas reservoir (spatial. In the future, the investigations in Peñas Blancas watershed need to be focused on determining the real influence of the flows, sediment release and the possible water quality degradation because of agriculture activities. Rev. Biol. Trop. 59 (2: 635-654. Epub 2011 June 01.

  7. [Physicochemical and biological characterization of the water quality in the Piedras Blancas basin, Antioquia, Colombia] [In Process Citation

    Science.gov (United States)

    Posada; Roldan; Ramirez

    2000-03-01

    From April to December 1996 a limnological study was carried out in 17 streams near Medellin, in order to stablish their water quality. The area is located in Piedras Blancas Park (6 degrees 8' 20"N, 75 degrees 30' 20"W) SE of Medellin at 2,400 m altitude. Three sampling periods, encompasing wet and dry season were selected: April-May, August-September and October-December. For qualitative collection methods hand screen and D-net were used. Each station was intensively sampled to collect most macroinvertebrates in all types of habitat. The area sampled in each station was 6 m2. Physicochemical variables in general showed small fluctuations along the study; only conductivity and total dissolved solids exhibited significant changes, all related with high precipitation in the wet season. Macroinvertebrate community consisted of 113 genera, 63 families and seven phyla. Trichoptera was the most abundant group. The results indicate that the freshwater ecosystems in the study area present a high water quality corresponding to a oligo-mesotrophic system.

  8. Growth analysis in chard plants (Beta vulgaris L. Cicla, cv. 'Pencas Blancas' exposed to different light quality

    Directory of Open Access Journals (Sweden)

    Fánor Casierra-Posada

    2014-08-01

    Full Text Available To determine the effects of light quality on the growth indices of plants, Pencas Blancas cultivar chard plantlets were grown for 2 months under five different light treatments, obtained by filtering sunlight through colored polyethylene films. The treatments included: red, blue, green, yellow and transparent cover colors. A transparent cover (white light was used as the control. The colored covers affected the plant growth. The plants grown under the yellow cover presented a better behavior with regards to growth, taken as: total dry weight per plant, leaf area, specific leaf area, absolute growth rate, relative growth rate, harvestable dry matter and root to shoot ratio. The dry matter partitioning in the leaves and roots was affected by the light quality, but not in the petioles, with a higher accumulation of dry mass in the leaves of plants grown under the yellow cover. As a consequence of the enhanced leaf area in the plants under the yellow cover, they also had the highest water uptake. On the other hand, the highest net assimilation rate value was found in plants grown under the transparent cover. These results open up the possibility of using yellow colored cover in leafy green vegetables, especially in chard plants grown under controlled conditions.

  9. A geologic and geophysic study of the Sierra de Pena Blanca, in the state of Chihuahua, Mexico

    International Nuclear Information System (INIS)

    Lopez S, F.A.

    1976-01-01

    Within the sistematic aerial exploration program realized by the Instituto Nacional de Energia Nuclear, an aeroradiometric study was carried out in the zone which includes Sierra de Pena Blanca. This study took into consideration the former and present geological investigations and compromised the sierra together with the bordering valleys. The main objective consists in the localization of areas presenting favorable conditions for the existence of uranium isotopes minerlization, in order to determine a mineralized body or ore deposit. For that purpose the area was explored with an airplane to which a differential gamma rays spectrometer was adapted, this spectrometer will show us clearly the integration of the number of radiations which fall into the detectors obtaining this way a valuable information about the radiometric anomalous sites of the studied zone and also about the existence of bismuth, thallium and the abundant potassium of the igneous rocks. These anomalies are under the stage of ground verification, this stage includes a superficial study and the study of the underlying rocks through drilling, radiometric logs and chemical analysis of the samples. In fact, through this method we can obtain very truthful data. (author)

  10. INOCULACIÓN IN VITRO DE LA ROYA BLANCA (Puccinia horiana HENNINGS EN CRISANTEMO (Dendranthema grandiflora TZVELEV

    Directory of Open Access Journals (Sweden)

    C\\u00E9sar Vences-Contreras

    2008-01-01

    Full Text Available El presente estudio tuvo como finalidad el desarrollar la técnica de inoculación in vitro de la roya blanca, con el objeto de ahorrar tiempo y espacio en la caracterización de los distintos cultivares de crisantemo respecto al grado de susceptibilidad o resistencia a este patógeno. En Tenancingo, Estado de México, en el periodo 2004-2005 se colectaron hojas de crisantemo que presentaban daños por la enfermedad, se desinfectaron para posteriormente inocular las pústulas sobre plantas creciendo bajo condiciones in vitro. El recipiente de cultivo se mantuvo a una humedad relativa alrededor del 95% y temperaturas entre los 13 y 27 ºC, bajo condiciones de luz y oscuridad. Los daños por la enfermedad se manifestaron a los 20 días después de la inoculación. Los tratamientos a 17 ºC y oscuridad generaron un mayor número de pústulas (18,7. El diámetro de las pústulas fluctuó entre los 0,71 mm (tratamientos con 17 ºC y luz a los 1,79 mm en los tratamientos con 19 ºC y bajo oscuridad.

  11. Analysis of 15 autosomal STR loci from Mar del Plata and Bahia Blanca (Central Region of Argentina).

    Science.gov (United States)

    Parolin, María Laura; Carreras-Torres, Robert; Sambuco, Lorena Andrea; Jaureguiberry, Stella Maris; Iudica, Celia Estela

    2014-05-01

    Allele frequencies for the 15 short tandem repeats (STRs) loci included in the AmpFlSTR® Identifiler kit were estimated in a sample of unrelated individuals from Mar del Plata (MDQ; N = 180) and Bahia Blanca (BB; N = 85) (Buenos Aires, Argentina). Biological samples were obtained from voluntary donors and forensic cases. Both populations were in Hardy-Weinberg equilibrium after Bonferroni correction, except for locus vWA in MDQ and D2S1338 in BB. FGA was the most informative locus, and the least discriminating locus was TPOX in both samples. The combined power of discrimination (PDc) and the combined probability of exclusion (PEc) were similar in MDQ and BB samples (0.999999998 < PDc < 0.999999999 and 0.999999979 < PEc < 0.999999989). The multidimentional scaling plot from Rst genetic distance matrix and the interethnic admixture estimation supported a higher European contribution in populations of the central region compared with populations from other regions of Argentina with higher Amerindian composition. These results enlarge the Argentine databases of autosomal STR loci, revealed as an excellent tool for human identification tests and population genetic analysis.

  12. Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

    Science.gov (United States)

    Bravo, M. E.; Aliotta, S.; Fiori, S.; Ginsberg, S.

    2018-03-01

    There has been a growing interest in the study of shallow gas due its importance in relation to the marine environment, climate change and human activities. In Bahía Blanca estuary, Argentina, shallow gas has a wide distribution. Acoustic turbidity and blanking are the main seismic evidence for the presence of shallow gas in the estuary. The former prevails in the inner sector of the estuary where gas is either near or in contact with the seabed. Gas deposits are generally associated with paleochannels corresponding to the Holocene paleodeltaic environment. Distribution studies of shallow gas in this estuary are necessary because its presence implies not only a geological risk for harbor activities but also because it may have noxious effects on the marine ecosystem, mainly on benthic communities. The comparison of benthic communities at a gas site (GS) with those at a control site (CS) indicated that gas could generate impoverishment in terms of individuals' abundance (GS: N = 357; CS: N = 724). Also, diversity indices showed great differences in the community structure at each site. This indicates that methane gas may act as a natural disturbance agent in estuarine ecosystems. The presence of gas in seabed sediments must therefore be taken into account when distribution studies are conducted of estuarine benthic communities.

  13. PHASE ANALYSES OF URANIUM-BEARING MINERALS FROM THE HIGH GRADE ORE, NOPAL I, PENA BLANCA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    M. Ren; P. Goodell; A. Kelts; E.Y. Anthony; M. Fayek; C. Fan; C. Beshears

    2005-07-11

    The Nopal I uranium deposit is located in the Pena Blanca district, approximately 40 miles north of Chihuahua City, Mexico. The deposit was formed by hydrothermal processes within the fracture zone of welded silicic volcanic tuff. The ages of volcanic formations are between 35 to 44 m.y. and there was secondary silicification of most of the formations. After the formation of at least part of the uranium deposit, the ore body was uplifted above the water table and is presently exposed at the surface. Detailed petrographic characterization, electron microprobe backscatter electron (BSE) imagery, and selected x-ray maps for the samples from Nopal I high-grade ore document different uranium phases in the ore. There are at least two stages of uranium precipitation. A small amount of uraninite is encapsulated in silica. Hexavalent uranium may also have been a primary precipitant. The uranium phases were precipitated along cleavages of feldspars, and along fractures in the tuff. Energy dispersive spectrometer data and x-ray maps suggest that the major uranium phases are uranophane and weeksite. Substitutions of Ca and K occur in both phases, implying that conditions were variable during the mineralization/alteration process, and that compositions of the original minerals have a major influence on later stage alteration. Continued study is needed to fully characterize uranium behavior in these semi-arid to arid conditions.

  14. Organizaciones, redes y desarrollo económico en ciudades medias: el caso de Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    José Ignacio Diez

    2016-01-01

    Full Text Available En las últimas décadas, las ciudades medias han recuperado su protagonismo en los sistemas urbanos, tanto en la bibliografía científica como en las estrategias de ordenamiento y desarrollo territorial a escala internacional. Como sucedió en la década de 1960, dichas localidades están adquiriendo preponderancia como componentes destacados de las políticas de desarrollo regional, al incorporarse como actores clave en las posibilidades de despegue industrial de territorios periféricos. Entre los instrumentos tendientes a promover su crecimiento y consolidación, la literatura especializada destaca la conformación de redes institucionales, como un elemento capaz de incentivar la innovación y el cambio tecnológico. En este sentido, se sostiene que en las ciudades medias más exitosas en el mundo, la existencia de un tejido institucional denso y complejo ha sido determinante para garantizar una competitividad de base territorial adecuada. El presente trabajo pretende analizar la dinámica de funcionamiento de la red de organizaciones de apoyo a la producción de Bahía Blanca, Argentina, con el propósito de entender en qué medida mejora las condiciones de competencia y desarrollo del territorio.

  15. Ichthyoplankton spatial pattern in the inner shelf off Bahía Blanca Estuary, SW Atlantic Ocean

    Science.gov (United States)

    Hoffmeyer, Mónica Susana; Clara, Menéndez María; Florencia, Biancalana; Mabel, Nizovoy Alicia; Ramón, Torres Eduardo

    2009-09-01

    This study focuses on the composition, abundance and distribution of ichthyoplankton in the inner shelf area off Bahía Blanca Estuary on the SW Atlantic Ocean during late spring. Eggs and larvae of Brevoortia aurea, Engraulis anchoita, Parona signata, Sciaenidae spp. - such as Cynoscion guatucupa and Micropogonias furnieri -, and Odontesthes argentinensis were found. Species richness was low probably as a result of season and shallow depths. Ichthyoplankton abundance reached values close to 10 000 per 10 m -3 (eggs) and 4000 per 10 m -3 (larvae) and displayed a spatial distribution pattern with maximum abundance values restricted to a band parallel to the coast. Differences between egg and larval patterns, probably derived from a different displacement and hydrodynamic behavior, were observed. Egg and larvae distribution patterns were found related with spawning areas and to directly depend on salinity and mesozooplankton. The larvae distribution pattern, in particular, was found to inversely depend on particulate organic carbon. In addition, the geographic location of egg and larvae maxima strongly coincided with a saline front reported for this area in springtime, thus suggesting a direct relationship with it.

  16. Drinking water: problems related to water supply in Bahía Blanca, Argentina Agua potable: problemas en el abastecimiento de la ciudad de Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    Ricardo Echenique

    2006-12-01

    Full Text Available In April 2000, alterations in drinking water quality, such as turbidity and odors similar to those of organochloride pesticides, were detected at Bahía Blanca (Argentina. This fact was associated to reports of dermic reactions and respiratory problems in the population. Samples drawn from Paso de las Piedras reservoir, two water treatment plants of at inlet and outlet points and at several particular houses were analyzed. Total phytoplankton in the reservoir varied between 49440 and 84832 cells.ml-1, while dominant species was, Anabaena circinalis. Efficiency to remove microorganisms (ER by the treatment plants considering cell number of total phytoplankton was analyzed. Bacteriological analysis, qualitative and quantitative studies of phytoplankton, pesticides, THM (trihalomethanes and BTEX (benzene, toluene, ethylbenzene and xylene analysis were carried out in samples of domestic supply and in the treatment plants. Even though samples were bacteriological potable, Anabaena circinalis and Microcystis aeruginosa algae were found at high concentrations in some cases. No pesticides were detected. THM and BTEX were below guideline values into recommendations for drinking water. Geosmin was responsible for detected odors. Besides, Copaene, another volatile metabolite, which on account in its structure could be considered a Geosmin precursor, was also detected. In Argentina, this was the first report of Cyanobacteria presence in drinking water.En abril de 2000, en Bahía Blanca (Argentina, se detectaron alteraciones en el agua de bebida, turbidez y olor semejante a "Gamexane". Esto coincidió con la aparición de problemas dérmicos y respiratorios en la población. Para determinar el origen del problema, se analizaron muestras, tomadas en el embalse Paso de las Piedras, en las plantas potabilizadoras y en varios domicilios particulares. En el embalse, la densidad celular del fitoplancton, fluctuó entre 49440 y 84832 cél/ml-1, muy por encima de

  17. Diatomeas planctónicas de cursos de agua: Cuenca del Río Piedra Blanca (Córdoba, Argentina Diatom communities in the highland water streams. Piedra Blanca River basin (Córdoba, Argentina

    Directory of Open Access Journals (Sweden)

    Ana Luján M. De Fabricius

    2005-12-01

    Full Text Available El presente trabajo se realizó en el arroyo El Chacay y en el río Las Albahacas desde la primavera de 1999 hasta la primavera de 2000. El objetivo de esta investigación fue comparar la composición y abundancia de la comunidad diatómica en ríos y arroyos serranos de la cuenca del río Piedra Blanca, durante un ciclo anual. En total, 121 taxa (especies, variedades y formas fueron registrados a partir del análisis taxonómico. El orden Pennales predominó en número de especies y porcentaje de frecuencia relativa. El género con mayor número de especies fue Navicula. El número de especies osciló entre un mínimo de 21 en invierno de 2000 en el río Las Albahacas (aguas arriba del balneario y un máximo de 49 en verano de 2000 en el arroyo El Chacay y en primavera de 2000 en el río Las Albahacas (aguas arriba del balneario, respectivamente. El mayor número de especies corresponde a los menores porcentajes de frecuencia. La densidad osciló entre 1 org.ml-1 en otoño de 2000 en el río Las Albahacas, aguas arriba del balneario y 1596,40 org.ml-1 registrados en primavera de 1999 en el arroyo El Chacay. Los parámetros fisicoquímicos y la composición de especies determinaron una mayor afinidad entre los sitios en la estación de primavera.The present work was developed in El Chacay Creek and Las Albahacas River from 1999 spring to 2000 spring. The aim of this investigation was to compare the composition and abundance of the diatom communities of a highland water stream and a river within the Piedra Blanca River basin, during an annual cycle. As a result of a taxonomic analysis a total of 121 taxa (species, varieties and forms were recorded. The Order Pennales predominated in number of species and relative frequency. The genus with the highest number of species was Navicula. The total number of species varied from a minimum of 21 in 2000 winter season in the Las Albahacas River (upstream riverside resort to a maximun of 49 in 2000 summer

  18. Invertebrados asociados al coral constructor de arrecifes Pocillopora damicornis en Playa Blanca, Bahía Culebra, Costa Rica Invertebrates associated with the reef-building coral Pocillopora damicornis at Playa Blanca, Bahía Culebra, Costa Rica

    Directory of Open Access Journals (Sweden)

    Juan José Alvarado

    2012-04-01

    Full Text Available Los arrecifes coralinos son uno de los ecosistemas más diversos en el planeta, tanto por los organismos constructores como por aquellos que viven encima, sobre, dentro y debajo de ellos. Los corales del genero Pocillopora son reconocidos mundialmente por albergar una importante fauna de invertebrados entre sus ramas, los cuales son considerados como simbiontes obligatorios en una gran cantidad de casos. La presente investigación describe la fauna de invertebrados asociados al coral Pocillopora damicornis en Bahía Culebra, Costa Rica, describiendo sus densidades, frecuencias, riquezas y diversidades a través del tiempo. Para esto se colectaron 5 colonias cada 3-4 meses en Playa Blanca, Bahía Culebra. En total se encontraron 448 individuos en 35 especies, siendo Harpiliopsis depressa, Lithophaga aristata, Trapezia ferruginea, Alpheus lottini, Fennera chacei, y Petrolisthes haigae las especies predominantes. Noviembre fue el mes en el que se encontraron los mayores valores en los índices de riqueza, diversidad y diferenciación taxonómica, mientras que agosto fue el que presento los valores más bajos de todos. En términos generales, la época lluviosa mostro mayor riqueza de especies que la época seca. Así mismo, las especies colectados y los valores obtenidos son muy similares a otras zonas del Pacifico Oriental Tropical. Culebra ha venido sufriendo una perdida en la cobertura coralina, que podría tener consecuencias en la diversidad y abundancia de organismos asociados a corales. Estas consecuencias incluyen perdida en la fecundidad de estos organismos, una reducción en su función como limpiadores y protectores de depredadores del coral, poniendo en riesgo su diversidad, lo que puede afectar los stocks de peces depredadores que depende de ellos. Realizar monitoreos permanentes de la criptofauna asociada al coral Pocillopora va a ser determinante para cuantificar perdidas o recuperaciones en la composición de invertebrados asociados

  19. The analysis of remote sensing data to delineate landsystem tracts in proglacial valleys in the Río Santa Basin, Cordillera Blanca, Perú

    Science.gov (United States)

    Narro Perez, R. A.; Eyles, C.

    2016-12-01

    The Río Santa Basin is an important glacially-influenced basin of social, economic and cultural importance to the country of Perú. It produces a large portion of Peru's hydroelectricity, is an important agricultural area, and hosts two major mining complexes. The Río Santa receives its water from precipitation, glacial runoff from over 450 glaciers draining the Cordillera Blanca, and groundwater discharge. Despite being the largest tropical glacier ice field in the world, the area of glacial coverage in the Cordillera Blanca has decreased from 825 km2 in 1930 to 528 km2 in 2003. It is estimated that glacial runoff contributes 10-20% of the Río Santa's annual flow but during the dry season it can contribute up to 66% of water flow with groundwater supplying the remainder. The contribution of glacial meltwater makes the Río Santa less susceptible to discharge variability caused by inter-annual variation in precipitation. Due to decreased meltwater contributions, the urban centers and rural communities in the basin are expected to face severe water scarcity in the future, especially during the dry season. This poster will show the results of a remote sensing survey, using Google Earth and LiDAR data, to delineate landsystem tracts and components in several proglacial valleys in the Cordillera Blanca. The results of this survey allow detailed documentation of the geomorphological evolution of the landscape which will in turn allow a better understanding of the glacial history and subsurface geology of the area. These findings will better inform current hydrogeological models used to determine the sustainability of water resources in the Río Santa basin. Understanding the landsystem architecture, sedimentology and subsurface stratigraphy of the basin will also allow these models to more accurately predict the impact that future climate change will have on water resources and the people of the Río Santa basin.

  20. The role of the smooth cordgrass Spartina alterniflora and associated sediments in the heavy metal biogeochemical cycle within Bahia Blanca estuary salt marshes

    Energy Technology Data Exchange (ETDEWEB)

    Hempel, M. [Dept. of Environmental Process Engineering, International Graduate School Zittau, Zittau (Germany); Botte, S.E. [Area de Oceanografia Quimica, Inst. Argentino de Oceanografia (IADO), CCT-CONICET, Bahia Blanca (Argentina); Dept. de Biologia, Bioquimica y Farmacia (DBBF), Univ. Nacional del Sur (UNS), Bahia Blanca (Argentina); Negrin, V.L.; Chiarello, M.N. [Area de Oceanografia Quimica, Inst. Argentino de Oceanografia (IADO), CCT-CONICET, Bahia Blanca (Argentina); Marcovecchio, J.E. [Area de Oceanografia Quimica, Inst. Argentino de Oceanografia (IADO), CCT-CONICET, Bahia Blanca (Argentina); Facultad Regional Bahia Blanca (UTN-FRBB), Univ. Tecnologica Nacional, Bahia Blanca (Argentina); Univ. FASTA, Mar del Plata (Argentina)

    2008-10-15

    Background, aim, and scope Bahia Blanca estuary is characterized by the occurrence of large intertidal areas, including both naked tidal flats and salt marshes densely vegetated with Spartina alterniflora. The estuary is strongly affected by human activities, including industrial and municipal discharges, harbor maintenance, cargo vessels and boat navigation, oil storage and processing, etc. Even numerous studies have reported the occurrence and distribution of heavy metals in sediments and biota from this estuary, although the function of the halophyte vegetation on metals distribution was at present not studied. The main objective of the present study was to understand the potential role of the salt marshes as a sink or source of metals to the estuary, considering both the obtained data on metal levels within sediments and plants from the studied areas at naked tidal as well as vegetated flats. Conclusions and recommendations Considering the comments on the previous paragraphs, salt marshes from Bahia Blanca estuary are sources or sinks for metals? It can be sustained that both are the case, even if it is often stated that wetlands serve as sinks for pollutants, reducing contamination of surrounding ecosystems (Weis and Weis, Environ Int 30:685-700, 2004). In the present study case, the sediments (which tend to be anoxic and reduced) act as sinks, while the salt marshes can become a source of metal contaminants. This is very important for this system because the macrophytes have been shown to retain the majority of metals in the underground tissues, and particularly in their associated sediments. This fact agreed well with previous reports, such as that from Leendertse et al., (Environ Pollut 94:19-29, 1996) who found that about 50% of the absorbed metals were retained in salt marshes and 50% was exported. Thus, keeping in mind the large spreading of S. alterniflora salt marshes within Bahia Blanca estuary, it must be carefully considered as a redistributor of

  1. The Point Sal–Point Piedras Blancas correlation and the problem of slip on the San Gregorio–Hosgri fault, central California Coast Ranges

    Science.gov (United States)

    Colgan, Joseph P.; Stanley, Richard G.

    2016-01-01

    Existing models for large-magnitude, right-lateral slip on the San Gregorio–Hosgri fault system imply much more deformation of the onshore block in the Santa Maria basin than is supported by geologic data. This problem is resolved by a model in which dextral slip on this fault system increases gradually from 0–10 km near Point Arguello to ∼150 km at Cape San Martin, but such a model requires abandoning the cross-fault tie between Point Sal and Point Piedras Blancas, which requires 90–100 km of right-lateral slip on the southern Hosgri fault. We collected stratigraphic and detrital zircon data from Miocene clastic rocks overlying Jurassic basement at both localities to determine if either section contained unique characteristics that could establish how far apart they were in the early Miocene. Our data indicate that these basins formed in the early Miocene during a period of widespread transtensional basin formation in the central Coast Ranges, and they filled with sediment derived from nearby pre-Cenozoic basement rocks. Although detrital zircon data do not indicate a unique source component in either section, they establish the maximum depositional age of the previously undated Point Piedras Blancas section to be 18 Ma. We also show that detrital zircon trace-element data can be used to discriminate between zircons of oceanic crust and arc affinity of the same age, a potentially useful tool in future studies of the California Coast Ranges. Overall, we find no characteristics in the stratigraphy and provenance of the Point Sal and Point Piedras Blancas sections that are sufficiently unique to prove whether they were far apart or close together in the early Miocene, making them of questionable utility as piercing points.

  2. Influence of aquatic plants on the predation of Piaractus mesopotamicus larvae by Pantala flavescens - doi: 10.4025/actascibiolsci.v32i2.5167 Influence of aquatic plants on the predation of Piaractus mesopotamicus larvae by Pantala flavescens - doi: 10.4025/actascibiolsci.v32i2.5167

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Bento Fernandes

    2010-05-01

    Full Text Available The experiment aimed to study the influence of the aquatic plants E. najas, P. stratiotes and S. auriculata on the predation of P. mesopotamicus larvae by P. flavescens. One hundred and twenty larvae of P. mesopotamicus and 24 larvae of P. flavescens were placed in 24 aquariums with capacity of 12 L, with one Odonate per aquarium. Treatments were different regarding the species of aquatic plants E. najas, S. auriculata and P. stratiotes, with one control treatment without aquatic plants. One aquarium (12 L containing one Odonate and 30 P. mesopotamicus larvae was considered one experimental unit. After 18 hours, the Odonates were removed from the aquariums and fish larvae left (alive were counted in each experimental unit. The survival rate of P. mesopotamicus larvae in the treatment without aquatic plants (control was significantly lower than in the treatment with E. najas. However, the survival rates in the aquariums with floating aquatic plants did not differ from the control. The morphological characteristics of E. najas promoted higher structural complexity in the environment, offering more protection to the fish larvae, and increasing their survival. We concluded that the presence of the submerged aquatic plant E. najas promoted the reduction of predation of P. mesopotamicus larvae by Pantala flavescens. Larvae; Piaractus mesopotamicus; Pantala flavescens; predation; aquatic plantsThe experiment aimed to study the influence of the aquatic plants E. najas, P. stratiotes and S. auriculata on the predation of P. mesopotamicus larvae by P. flavescens. One hundred and twenty larvae of P. mesopotamicus and 24 larvae of P. flavescens were placed in 24 aquariums with capacity of 12 L, with one Odonate per aquarium. Treatments were different regarding the species of aquatic plants E. najas, S. auriculata and P. stratiotes, with one control treatment without aquatic plants. One aquarium (12 L containing one Odonate and 30 P. mesopotamicus larvae was

  3. Testing Pixel Translation Digital Elevation Models to Reconstruct Slip Histories: An Example from the Agua Blanca Fault, Baja California, Mexico

    Science.gov (United States)

    Wilson, J.; Wetmore, P. H.; Malservisi, R.; Ferwerda, B. P.; Teran, O.

    2012-12-01

    We use recently collected slip vector and total offset data from the Agua Blanca fault (ABF) to constrain a pixel translation digital elevation model (DEM) to reconstruct the slip history of this fault. This model was constructed using a Perl script that reads a DEM file (Easting, Northing, Elevation) and a configuration file with coordinates that define the boundary of each fault segment. A pixel translation vector is defined as a magnitude of lateral offset in an azimuthal direction. The program translates pixels north of the fault and prints their pre-faulting position to a new DEM file that can be gridded and displayed. This analysis, where multiple DEMs are created with different translation vectors, allows us to identify areas of transtension or transpression while seeing the topographic expression in these areas. The benefit of this technique, in contrast to a simple block model, is that the DEM gives us a valuable graphic which can be used to pose new research questions. We have found that many topographic features correlate across the fault, i.e. valleys and ridges, which likely have implications for the age of the ABF, long term landscape evolution rates, and potentially provide conformation for total slip assessments The ABF of northern Baja California, Mexico is an active, dextral strike slip fault that transfers Pacific-North American plate boundary strain out of the Gulf of California and around the "Big Bend" of the San Andreas Fault. Total displacement on the ABF in the central and eastern parts of the fault is 10 +/- 2 km based on offset Early-Cretaceous features such as terrane boundaries and intrusive bodies (plutons and dike swarms). Where the fault bifurcates to the west, the northern strand (northern Agua Blanca fault or NABF) is constrained to 7 +/- 1 km. We have not yet identified piercing points on the southern strand, the Santo Tomas fault (STF), but displacement is inferred to be ~4 km assuming that the sum of slip on the NABF and STF is

  4. Análisis del Clima Laboral a través de la Comunicación Interna: "Caso Industria de Línea Blanca"

    OpenAIRE

    Ortiz Ochoa, Melania Francisca

    2013-01-01

    La presente es una investigación de campo realizada en una empresa productora de línea blanca, la misma que cuenta con su matriz en la ciudad de Cuenca, La investigación está basada en el impacto de contar con un proceso de comunicación interna, inmersa en los procesos estratégicos de la organización, para conseguir un mejor resultado en el Clima Laboral organizacional. La investigación ha sido sustentado en un marco teórico práctico establecidos en lineamentos y políticas instituidas en la o...

  5. "Pelando papas se combate al fascismo": roles y funciones de las asociaciones antifascistas de Bahía Blanca durante la Guerra Civil Española

    OpenAIRE

    Ardanaz, María Eleonora

    2013-01-01

    El presente trabajo es una primera aproximación al estudio de las agrupaciones femeninas que se conformaron en solidaridad con el bando republicano en la Guerra Civil Española, en la ciudad de Bahía Blanca. En este análisis priman las herramientas metodológicas proporcionadas tanto por la denominada historia local o regional y por la historia de género -este último concepto se devela como especialmente útil para la complejización de lo que se suele denominar como campo antifascista-. El objet...

  6. Long-term study of the life cycle and growth of Heleobia australis (Caenogastropoda, Cochliopidae) in the Bahía Blanca estuary, Argentina

    OpenAIRE

    Carcedo, Maria Cecilia; Fiori, Sandra Marcela

    2017-01-01

    The life cycle and growth of the mud-snail Heleobia australis (d?Orbigny, 1835) was studied in the Bahía Blanca estuary (39º S, Argentina) from april 2008 to april 2010. Four year classes were identified. H. australis recruits once a year, during summer. In general, the recruits (< 2.5 mm) represented a small percentage of the total population abundance. The growth rate of H. australis declined with increasing animal size. Growth rate for the population under study shows a marked seasonal pat...

  7. Unraveling Tropical Mountain Hydroclimatology by Coupling Autonomous Sensor Observations and Climate Modeling: Llanganuco Valley, Cordillera Blanca, Peru.

    Science.gov (United States)

    Hellstrom, R. A.; Fernandez, A.; Mark, B. G.; Covert, J. M.

    2015-12-01

    Northern Peru will face critical water resource issues in the near future as permanent ice retreats. Much of current global and regional climate research neglects the meteorological forcing of lapse rates and valley wind dynamics on critical components of the Peruvian Andes' water-cycle. In 2004 and 2005 we installed an autonomous sensor network (ASN) within the glacierized Llanganuco Valley, Cordillera Blanca (9°S), consisting of discrete, cost-effective, automatic temperature loggers located along the valley axis and anchored by two automatic weather stations. Comparisons of these embedded atmospheric measurements from the ASN and climate modeling (CM) by dynamical downscaling using the Weather Research and Forecasting (WRF) model elucidate distinct diurnal and seasonal characteristics of the mountain valley winds and lapse rates. Wind, temperature, humidity, and cloud simulations by WRF suggest that thermally driven valley winds converging with easterly flow aloft enhance late afternoon and evening cloud development which helps explain detected nocturnal precipitation maxima measured by the ASN. We attribute sustained evapotranspiration (ET), as estimated by the FAO-56 Penman-Monteith model, to an abundance of glacial melt-water during the dry season and strong pre-noon solar heating during the wet season. Furthermore, the extreme diurnal variability of along-valley-axis lapse rates and valley wind detected from ground observations and confirmed by dynamical downscaling demonstrate the importance of realistic scale parameterizations of the boundary layer to improve regional CM projections in mountainous regions. Our findings portray ET as an integral yet poorly represented process in Andean hydroclimatology. We show that coupling ASN and CM can improve understanding of multi-scale atmospheric and associated hydrological processes in mountain valleys.

  8. [Distribution patterns and bioerosion of the sea urchin Centrostephanus coronatus (Diadematoida: Diadematidae), at the reef of Playa Blanca, Colombian Pacific].

    Science.gov (United States)

    Toro-Farmer, Gerardo; Cantera, Jaime R; Londoño-Cruz, Edgardo; Orozco, Carlos; Neira, Raul

    2004-03-01

    Regular sea-urchins are one of the main bioeroding organisms affecting coral reefs around the world. The abundance, distribution and bioerosion rate of the sea-urchin Centrostephanus coronatus, were determined in different reef zones of Playa Blanca fringing reef (Gorgona Island, Colombian pacific coast) during 1997 and 1998. The erosion rates were determined calcinating the gut content of the sea-urchins to eliminate all organic components and preserve the inorganic portion of calcium carbonate. C. coronatus showed the highest densities towards the central zones of the reef (plain-crest and front) (12.4 ind/m2; range 0-48 ind/m2). The highest mean bioerosion rate was 0.103 kgCaCO3/m2/yr in the reef plain-crest (0-0.69 kgCaCO3/m2/yr). In the other zones, (back reef and reef front) the mean bioerosion rates were 0.071 (range 0-0.39) and 0.052 (range 0-0.31) kgCaCO3/m2/yr respectively. According to the present data, it can be seen that the destruction of coralline skeletons, produced in this reef by sea-urchins is rather low, compared with the abrasion caused by these organisms in other places of the world. However, the combined action of C. coronatus and other bioeroding organisms (borers and grazers). along with some adverse environmental factors to corals, can be causing a negative balance between normal processes of reef accretion-destruction in Gorgona Island reefs.

  9. EVALUACIÓN DE ACTIVIDADES ENDOGLUCANASA, EXOGLUCANASA, LACASA Y LIGNINA PEROXIDASA EN DIEZ HONGOS DE PUDRICIÓN BLANCA

    Directory of Open Access Journals (Sweden)

    SANDRA MONTOYA B.

    Full Text Available Este trabajo presenta una vía de rastreo de producción de enzimas lignocelulolíticas en diez especies de hongos de pudrición blanca: Lentinula edodes, Schizophyllum commune, Trametes trogii, Coriolus versicolor, Pycnoporus sanguineus, Ganoderma applanatum, Ganoderma lucidum, Grifola frondosa, Pleurotus ostreatus y Auricularia delicata. Estas especies primero fueron rastreadas sobre medios de cultivo sólido que contienen carboximetil celulosa, celulosa cristalina, ABTS (2,2´-azino-bis(3-etilbenzotiazolina-6-sulfonato y azure B, los cuales evidenciaron la producción de las enzimas endoglucanasa, exoglucanasa, lacasa y lignina peroxidasa (LiP. Las actividades celulolíticas fueron detectadas a los cinco días de incubación con el indicador rojo congo, formándose un halo claro-blanco en las zonas donde se degrada la celulosa. Para las ligninasas, este rastreo consistió en el seguimiento a la formación de halos verdes por oxidación del ABTS para lacasa y halos de decoloración sobre el azure B para la LiP durante 14 días de incubación. De este rastreo cualitativo, se seleccionaron cuatro cepas (G. lucidum, L. edodes, C. versicolor y T. Trogii, como las mejores productoras de enzimas celulolíticas y ligninolíticas. Estas cuatro especies fueron inoculadas sobre un sustrato de aserrín de roble, obteniéndose 51,8% de lignina degradada por L. edodes y 22% de celulosa degrada por C. versicolor.

  10. Monitoring tropical debris-covered glacier dynamics from high-resolution unmanned aerial vehicle photogrammetry, Cordillera Blanca, Peru

    Science.gov (United States)

    Wigmore, Oliver; Mark, Bryan

    2017-11-01

    The glaciers of the Cordillera Blanca, Peru, are rapidly retreating and thinning as a result of climate change, altering the timing, quantity and quality of water available to downstream users. Furthermore, increases in the number and size of proglacial lakes associated with these melting glaciers is increasing potential exposure to glacier lake outburst floods (GLOFs). Understanding how these glaciers are changing and their connection to proglacial lake systems is thus of critical importance. Most satellite data are too coarse for studying small mountain glaciers and are often affected by cloud cover, while traditional airborne photogrammetry and lidar are costly. Recent developments have made unmanned aerial vehicles (UAVs) a viable and potentially transformative method for studying glacier change at high spatial resolution, on demand and at relatively low cost.Using a custom designed hexacopter built for high-altitude (4000-6000 m a. s. l. ) operation, we completed repeat aerial surveys (2014 and 2015) of the debris-covered Llaca Glacier tongue and proglacial lake system. High-resolution orthomosaics (5 cm) and digital elevation models (DEMs) (10 cm) were produced and their accuracy assessed. Analysis of these datasets reveals highly heterogeneous patterns of glacier change. The most rapid areas of ice loss were associated with exposed ice cliffs and meltwater ponds on the glacier surface. Considerable subsidence and low surface velocities were also measured on the sediments within the pro-glacial lake, indicating the presence of extensive regions of buried ice and continued connection to the glacier tongue. Only limited horizontal retreat of the glacier tongue was observed, indicating that measurements of changes in aerial extent alone are inadequate for monitoring changes in glacier ice quantity.

  11. 21Ne surface exposure dating of giant landslides at Sierra Laguna Blanca, Argentina: Evidence for tectonic control on slope oversteepening

    International Nuclear Information System (INIS)

    Niederman, S.; Hermanns, R.L; Strecker, M.R

    2001-01-01

    In the Argentine Andes and the adjacent foreland between 24 o and 28 o more than 50 landslide deposits with volumes between 10 6 and 4x10 8 m 3 have been identified, either in narrow valleys or on broad piedmont areas (Hermanns and Strecker, 1999). Dating such catastrophic mass movements is essential for assessing the frequency of landslides as well as possible conditioning and triggering mechanisms. However, deriving a chronology of such events is difficult in the arid to semi-arid regions of northwestern Argentina, where landslide deposits are often void of 14 C-datable material. In-situ-produced nuclides in rocks exposed to cosmic ray irradiation after the landslide event, either on the breakaway scarp or on the surface of the deposit, provide an alternative dating tool. The scope of the present work is to reveal the frequency of giant landslides along a tectonically active mountain front. The Sierra Laguna Blanca (hereafter SLB; 26 o 30', 67 o 10'W) in the Puna plateau of the Southern Central Andes represents an ideal location for this study, because its western piedmont comprises ten large landslide deposits of the rockavalanche type. Eight of them are laterally superposed, providing relative age control. In addition, four reverse faults with important displacement indicate sustained Neogene to Quaternary tectonic activity of this mountain front. The high elevation of ∼4000 m and a prevailing dry climate throughout the Quaternary in this area (Fox and Strecker, 1991) render these landslide deposits well-suited for cosmic ray exposure dating (au)

  12. Monitoring tropical debris-covered glacier dynamics from high-resolution unmanned aerial vehicle photogrammetry, Cordillera Blanca, Peru

    Directory of Open Access Journals (Sweden)

    O. Wigmore

    2017-11-01

    Full Text Available The glaciers of the Cordillera Blanca, Peru, are rapidly retreating and thinning as a result of climate change, altering the timing, quantity and quality of water available to downstream users. Furthermore, increases in the number and size of proglacial lakes associated with these melting glaciers is increasing potential exposure to glacier lake outburst floods (GLOFs. Understanding how these glaciers are changing and their connection to proglacial lake systems is thus of critical importance. Most satellite data are too coarse for studying small mountain glaciers and are often affected by cloud cover, while traditional airborne photogrammetry and lidar are costly. Recent developments have made unmanned aerial vehicles (UAVs a viable and potentially transformative method for studying glacier change at high spatial resolution, on demand and at relatively low cost.Using a custom designed hexacopter built for high-altitude (4000–6000 m a. s. l.  operation, we completed repeat aerial surveys (2014 and 2015 of the debris-covered Llaca Glacier tongue and proglacial lake system. High-resolution orthomosaics (5 cm and digital elevation models (DEMs (10 cm were produced and their accuracy assessed. Analysis of these datasets reveals highly heterogeneous patterns of glacier change. The most rapid areas of ice loss were associated with exposed ice cliffs and meltwater ponds on the glacier surface. Considerable subsidence and low surface velocities were also measured on the sediments within the pro-glacial lake, indicating the presence of extensive regions of buried ice and continued connection to the glacier tongue. Only limited horizontal retreat of the glacier tongue was observed, indicating that measurements of changes in aerial extent alone are inadequate for monitoring changes in glacier ice quantity.

  13. Diferentes niveles de energía metabolizable y aminoácidos azufrados en dietas para gallinas Bovans blancas

    Directory of Open Access Journals (Sweden)

    María de los Ángeles Tepox Pérez

    2012-01-01

    Full Text Available Con el objeto de evaluar el comportamiento productivo de la gallina Bovans blanca de primer ciclo alimentadas con dietas con niveles diferentes de energía metabolizable (EM y de metionina+cistina digestible (AAD, para lograr disminuir el porcentaje de huevo pequeño (<42 g, al inicio de la producción se utilizaron 384 gallinas de 19 semanas de edad. Se usó un diseño completamente al azar, en un arreglo factorial de 4 X 2, donde el primer factor fueron los niveles de EM (2700, 2800, 2900, 3000 Kcal/kg y el segundo factor fue la inclusión de diferentes porcentajes de AAD (0.45, 0.61. Cada tratamiento, contó con cuatro repeticiones de 12 gallinas cada uno. Durante ocho semanas se llevaron registros semanales, del porcentaje de postura, peso promedio del huevo, consumo de alimento; masa de huevo/ave/día y conversión alimenticia; además, se clasificó el huevo de acuerdo al peso. Los resultados obtenidos, no mostraron respuesta a los factores de estudio ni a la interacción entre nivel de EM y AAD, para ninguna de las variables productivas. Se encontró un efecto sobre el consumo de alimento del nivel de energía y aminoácidos azufrados (P<0.05. Se disminuyó el porcentaje de huevo pequeño en los niveles más altos de EM de 2900 y 3000 Kcal/Kg (29.6 y 30.4 % respectivamente. Se incrementó (P<0.05 el porcentaje de huevo grande en 3 % al usar dietas con el nivel de AAD de 0.61 %.

  14. Desempeño de los sistemas acuícolas de recirculación en el cultivo intensivo del Pacú Piaractus mesopotamicus(Characiformes: Characidae

    Directory of Open Access Journals (Sweden)

    Omar Domínguez Castanedo

    2012-03-01

    Full Text Available Una alternativa que permite intensificar la producciónacuícola, y reducir el impacto ambiental y los gastosde operación son los sistemas acuícolas de recirculación(SAR. Se evaluó el desempeño de SAR AquaticEcosystems® en el cultivo ornamental de Piaractus mesopotamicus,y se estimó el crecimiento y la calidad del agua,con dos alimentos comerciales de 18 (T1 y 28% (T2 deproteínas. Del crecimiento se midieron quincenalmente:la longitud patrón, altura máxima, peso y factor de condiciónmúltiple (KM. De la calidad de agua se evaluósemanalmente, O.D., NH3-NH4, pH, NO2, NO3, KH y PO4.Con el modelo de Timmons-Ebeling se calculó la tasa deproducción de NH3-N. Los resultados muestran diferenciassignificativas en el peso, donde T2 presentó un incrementode 7.14% más que T1, que mostró un mayor KM. La calidad del agua fue adecuada en los parámetros limitantes(OD=T1: 4.23±1.23; T2: 4.13±0.86; NH3=T1: 0.02±0.02;T2: 0.06±0.10, a excepción del pH (T1: 6.95±0.98; T2:7.11±1.03 que presentó valores letales (Performance of recirculating aquaculture systems in the intensive farming of Pacú Piaractus mesopotamicus (Characiformes: Characidae. An alternative to intensify fish production, reducing the environmentalimpact and production costs are recirculating aquaculture systems (RAS. The performance of a RASwas evaluated, as fish growth and water quality conditions, in a culture of Piaractus mesopotamicus reared forornamental purposes. Two commercial food brands with different protein contents (18%-TI and 28%-T2, weregiven to juvenile fishes during an eight weeks period. Growth was measured bi-weekly: standard length (Lp,peak height (A, weight and multiple condition factor (KM. The evaluation of water parameters included: dissolvedoxygen, NH3-NH4, pH, NO2, NO3, KH carbonate hardness and PO4. NH3-N rate production was analyzedfollowing Timmons-Ebeling model. Results demonstrated significant differences in weight only, and T2 showeda 7

  15. Influência da adição de iodeto de potássio e citrato de sódio na qualidade do sêmen de pacu (Piaractus mesopotamicus - Holmberg, 1887 The effects of potassium iodide and sodium citrate on semen quality of pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Alexandre Nízio Maria

    2004-02-01

    Full Text Available Atualmente, tem-se dado maior atenção ao desenvolvimento de tecnologias para estocagem de sêmen de peixes em curto prazo, por dias ou semanas, utilizando diluentes de sêmen que não ativem a motilidade espermática. Essa técnica é indicada em piscicultura para facilitar a reprodução artificial ou aumentar sua eficiência. Conduziu-se este trabalho com o objetivo de verificar o efeito do diluidor BTS (Beltsville Thawing Solution - MINITUB® na qualidade do sêmen de pacu, após a coleta, enriquecido com iodeto de potássio e com citrato de sódio. Foram utilizados seis reprodutores de pacu (Piaractus mesopotamicus submetidos à indução hormonal e liberação dos gametas, manualmente. O sêmen coletado de cada macho foi dividido em três frações, as quais receberam diluição (1:3 com o diluidor 1 (BTS 5% + iodeto de potássio 0,16%, diluidor 2 (BTS 5% + citrato de sódio 1,28% e uma fração não diluída (controle. A ativação espermática foi realizada com água destilada, e, a seguir, foram avaliadas as taxas e duração da motilidade espermática, cujos valores médios respectivos foram de 95,00 ± 3,16% e 486,83 ± 314,55 segundos para o sêmen in natura, 80,00 ± 9,49% e 221,50 ± 207,89 segundos para o sêmen com o diluidor 1 e 80,00 ± 11,40% e 320,66 ± 181,14 segundos para o sêmen no diluidor 2. Em seguida, foram coletadas amostras para a avaliação da concentração espermática, que obteve um valor médio de 13,89 ± 1,26 x 10(9/mL. Pelas análises estatísticas, verificou-se que não houve diferença significativa na duração da motilidade (P>0,05 entre o sêmen “in natura” e os diluidores 1 e 2. A motilidade espermática foi estatisticamente melhor (PCurrently, it has been given a special attention to developing technologies for short-term storage of fish semen, for a few days to weeks, using extenders of semen that do not activate the sperm motility. The short-term storage technique is indicated for fish culture

  16. Análise da degradação de dieta microencapsulada por larvas de pacu (Piaractus mesopotamicus, Holmberg, 1887 através de microscopia eletrônica de varredura - DOI: 10.4025/actascianimsci.v25i1.2088 Degradation analysis of microencapsulated diet in pacu (Piaractus mesopotamicus Holmberg, 1887 larvae intestine through scanning electron microscopy (SEM - DOI: 10.4025/actascianimsci.v25i1.2088

    Directory of Open Access Journals (Sweden)

    Maria Célia Portella

    2003-04-01

    Full Text Available Este trabalho teve como objetivo analisar o grau de degradabilidade de dietas microencapsuladas por larvas de pacu (Piaractus mesopotamicus, através da microscopia eletrônica de varredura. Os seguintes tratamentos alimentares foram testados: AMD - larvas alimentadas por 6 dias, com náuplios de Artemia, com transição brusca para dieta microencapsulada; C6MD - alimentação inicial com Artemia por 6 dias, 6 dias de co-alimentação e o restante do tempo (8 dias somente com dieta microencapsulada; e C9MD - idêntico ao tratamento anterior, porém, com 9 dias de co-alimentação. O conteúdo presente no trato digestório das larvas foi coletado e processado para análise em microscópio eletrônico de varredura. Os grânulos provenientes das larvas do tratamento de transição brusca (AMD possuíam poucas áreas de degradação, semelhantes às dietas secas. Já as dietas coletadas das larvas durante o período de co-alimentação possuíam uma maior área degradada. Os resultados sugerem uma influência dos náuplios de Artemia sobre a degradação das dietas microencapsuladas.This research analyzed the microencapsulated diet degradation in pacu (Piaractus mesopotamicus larvae intestine. The pacu larvae received the following feeding treatments: AMD- larvae fed initially Artemia nauplii for six days, followed by microencapsulated diet; C6MD- larvae fed initially Artemia for six days, followed by six days of co-feeding and the rest of the experiment (8 days with microencapsulated diet; C9MD- larvae fed initially Artemia for six days, followed by nine days of co-feeding and the rest of the experiment (5 days with microencapsulated diet. The pacu digestive tract contents were removed, processed and analyzed under scanning electronic microscopy. Diets from AMD larvae treatment showed few degradation areas, when compared to original dry diets. On the other hand, diets removed during co-feeding period showed the highest degradation areas. The

  17. Parâmetros sangüíneos de pacu Piaractus mesopotamicus (Holmberg, 1887 alimentados com dietas suplementadas com cromo trivalente em duas densidades de estocagem - DOI: 10.4025/actascianimsci.v29i4.1019 Hematological parameters of pacu Piaractus mesopotamicus (Holmberg, 1887 fed diets supplemented with trivalent chromium in two stocking densities - DOI: 10.4025/actascianimsci.v29i4.1019

    Directory of Open Access Journals (Sweden)

    Flávio Ruas de Moraes

    2008-03-01

    Full Text Available O objetivo deste trabalho foi avaliar os efeitos da suplementação com cromo trivalente (0, 6, 12 e 18 mg kg-1 de ração sobre as variáveis hematológicas de Piaractus mesopotamicus, mantidos em duas densidades de estocagem (4 e 20 kg m-3. Os mantidos na maior densidade e alimentados com dietas suplementadas com 0 e 6 mg de cromo kg-1 apresentaram redução do número de linfócitos circulantes, sugerindo má adaptação a essa condição de alta densidade. Nas dietas suplementadas com 12 e 18 mg kg-1, tal efeito não foi observado, porém verificou-se aumento do número de trombócitos no tratamento com 12 mg de cromo kg-1. A inexistência de diferença significativa entre os tratamentos, aos 30 dias, sugere a adaptação dos peixes ao tipo de alimento e à situação de alta densidade. Portanto, nas condições deste ensaio, a suplementação com 12 e 18 mg de cromo kg-1 é interessante como estratégia alimentar durante 15 dias.This work evaluated the effects of chromium supplementation on the hematological parameters of Piaractus mesopotamicus Holmberg, 1887 maintained in two stocking densities. Fish were fed diets supplemented with 0, 6, 12 and 18 mg trivalent chromium kg-1 dry ration and maintained at 4 and 20 kg m-3. The fish under high stocking density and fed diets supplemented with 0 and 6 mg kg-1 showed reduction in the number lymphocytes, which suggests non-adaptation to this condition of high density. This was not observed in fish fed diets supplemented with 12 and 18 mg chromium kg-1, but an increase in the number of thrombocytes was evident. The lack of difference between treatments after 30 days may suggest a possible adaptation of fish to the situation. It can be added that supplementation with 12 and 18 mg chromium kg-1 is an interesting feeding strategy for a period of 15 days.

  18. Insectos acuáticos y calidad del agua en la cuenca y embalse del río Peñas Blancas, Costa Rica

    Directory of Open Access Journals (Sweden)

    Meyer Guevara Mora

    2011-06-01

    Full Text Available La población de insectos acuáticos y la calidad del agua fueron caracterizadas tomando en cuenta las alteraciones humanas y naturales en el área de estudio. Durante los muestreos mensuales, el pH, OD, temperatura, nivel del agua, DBO, PO4 y NO3 fueron medidos. Los índices biológicos (abundancia, riqueza de especies y el BMWP-CR se evaluaron para determinar la calidad del agua. No se detectaron relaciones entre las variables ambientales y los insectos acuáticos, pero las diferencias espaciales y temporales en la abundancia y riqueza fueron asociadas con las crecidas del río (temporal y a la presencia del embalse Peñas Blancas (espacial. En el futuro las investigaciones en la cuenca Peñas Blancas deben de ser dirigidas a determinar la magnitud de la influencia de los caudales, liberación de sedimentos y la posible degradación de la calidad del agua por efluentes de aguas servidas que se lleguen a ubicar en la cuenca.

  19. "LOS TECHOS DEL VECINO": ANÁLISIS ANTRACOLÓGICO DE RESTOS DE CONSTRUCCIÓN CARBONIZADOS DE LOS SITIOS "IGLESIA DE LOS INDIOS" Y "PIEDRAS BLANCAS" (CATAMARCA

    Directory of Open Access Journals (Sweden)

    María B. Marconetto

    2008-01-01

    Full Text Available El registro arqueológico del Valle de Ambato en el Noroeste argentino presenta la particularidad de preservar las maderas empleadas en la construcción de los asentamientos, debido a incendios ocurridos en la zona hacia el siglo XI d.C. Esta peculiaridad ha permitido recuperar hasta el momento abundante material. Se realizó la identificación taxonómica de muestras correspondientes a 105 troncos utilizados como postes y vigas en la construcción de los sitios "Iglesia de los Indios" y "Piedras Blancas". Los análisis antracológicos presentaron resultados sensiblemente diferentes, habiéndose empleado para la Iglesia de los Indios materias primas alóctonas al valle, contrariamente a lo que ocurre en el sitio Piedras Blancas. Sobre esta base se discuten las correspondencias entre ambos sitios en torno a la selección, usos y significados de los distintos recursos forestales.

  20. Exceptionally high Cd levels and other trace elements in eggshells of American oystercatcher (Haematopus palliatus) from the Bahía Blanca Estuary, Argentina.

    Science.gov (United States)

    Simonetti, Pía; Botté, Sandra Elizabeth; Marcovecchio, Jorge Eduardo

    2015-11-15

    Concentrations of six trace metals were determined in the eggshells of American oystercatchers (Haematopus palliatus) from the Bahía Blanca estuary, Argentina. All metals measured in selected samples presented concentrations above the detection limit. Means found for Cu, Pb, Cr, Zn and Ni were as follow: 2.02±0.52, 7.23±2.33, 0.78±0.03, 2.22±1.13 and 6.05±0.89mg/kg dw. The mean concentrations of Cd found were surprisingly high: 13.28±3.38mg/kg dw. Previous studies made on prey items of the American oystercatchers showed low to medium concentrations of the six trace metals. This may indicate a possible transfer of the metals that are available in the environment through food chains. Our study indicates that American oystercatchers sequester heavy metals in their eggshells. Therefore the eggshells may be useful as biomonitors for trace metal contamination in the Bahía Blanca estuary. Copyright © 2015 Elsevier Ltd. All rights reserved.

  1. Relación masa-radio para estrellas enanas blancas y la interpretación de recientes mediciones hechas por Hipparcos

    Science.gov (United States)

    Panei, J. A.; Althaus, L. G.; Benvenuto, O. G.

    Recientes mediciones de la masa y el radio hechas por Hipparcos de las estrellas enanas blancas 40 Eri B y Procyon B (Shipman, H. & Provencal, J. - ApJ. 1998, 494, 759), sugieren un núcleo compuesto de hierro para dichas estrellas, en lugar de carbono y oxígeno como predice la teoría standard de evolución estelar. Para interpretar estas observaciones, presentamos aquí, relaciones masa-radio para configuraciones degeneradas a temperatura finita para distintas composiciones químicas centrales. Para tal fin hemos calculado secuencias evolutivas de enanas blancas utilizando el código de evolución estelar, desarrollado en el Observatorio de La Plata. Dicho código resuelve las ecuaciones de estructura y evolución estelar mediante la técnica de relajación de Henyey, y esta basado en una descripción física muy detallada y actualizada.

  2. ESTUDIO COMPARATIVO DE LOS COMPUESTOS VOLÁTILES DE TRES VARIEDADES DE GUAYABA BLANCA (Psidium guajava L. DURANTE SU MADURACIÓN

    Directory of Open Access Journals (Sweden)

    Johanna Cantillo

    2011-05-01

    Full Text Available Regional Blanca (RB y Ráquira (RQ. Seutilizó el método Headspace-Microextracciónen Fase Sólida (HS-MEFS paracomparar los perfiles olfativos de tres variedadesde guayaba blanca de la regiónde la hoya del río Suárez (Santander, Colombiadurante tres etapas de maduración(verde, pintón y maduro. En las tresvariedades se presentó un comportamientosimilar, los aldehídos C-6 (hexanal,(Z-3-hexenal y (E-2-hexenal responsablesde la nota verde disminuyen durantela maduración, mientras que el contenidode ésteres (acetato de hexilo y acetato de(Z-3-hexenilo aumenta produciéndoselas notas dulce y frutal características dela fruta madura. Los compuestos ácidos,furánicos y alcoholes se observan en bajasproporciones durante las tres etapas.El análisis de los compuestos volátilesmediante HS-MEFS permitió estableceruna relación entre la transformación decompuestos aldehídos C6, responsablesde la nota verde, en ésteres análogos, alos cuales se les atribuye la nota frutalcaracterística durante el proceso demaduración.

  3. The reconstruction of a glacial lake outburst flood using HEC-RAS and its significance for future hazard assessments: an example from Lake 513 in the Cordillera Blanca, Peru

    Czech Academy of Sciences Publication Activity Database

    Klimeš, Jan; Benešová, M.; Vilímek, V.; Bouška, P.; Rapre, A.C.

    2014-01-01

    Roč. 71, č. 3 (2014), s. 1617-1638 ISSN 0921-030X R&D Projects: GA ČR(CZ) GAP209/11/1000 Institutional support: RVO:67985891 Keywords : GLOFs * debris flow * natural hazard * HEC-RAS * Cordillera Blanca Subject RIV: DE - Earth Magnetism, Geodesy, Geography Impact factor: 1.719, year: 2014

  4. Caracterización fenotípica y molecular de poblaciones de zacate punta blanca (Digitaria californica (Benth. Henr.

    Directory of Open Access Journals (Sweden)

    Carlos Raúl Morales Nieto

    2012-01-01

    Full Text Available Se exploró y caracterizó la diversidad fenotípica y genotípica de poblaciones del pasto punta blanca [Digitaria californica (Benth. Henr.], en pastizales de Chihuahua. Se realizó análisis de componentes principales y conglomerados. Se observaron diferencias significativas (P<0.05 entre variables, indicando alta diversidad fenotípica y molecular entre poblaciones. Los tres primeros componentes explicaron 79 % de la variación morfológica mostrada por los 91 ecotipos. Para el CP1, las variables que mejor explicaron la variabilidad morfológica fueron densidad de tallos, rendimiento de forraje y altura de forraje, las cuales se caracterizan por agrupar variables relacionadas con producción de forraje. Al analizar la correlación del CP1 con rendimiento de forraje, se observó que a medida que la densidad de tallos se incrementó, el rendimiento de forraje se incrementó casi en la misma proporción (r= 0.94. Efecto similar ocurrió sobre rendimiento de forraje con altura de forraje (r= 0.77, altura de planta (r= 0.72 y diámetro de macollo (r= 0.72. Los marcadores moleculares presentaron 179 bandas, donde el 86.6 % presentan polimorfismo y 13.7 % monomorfismo. El número de bandas polimórficas fue de 38, 38, 38 y 40 para las combinaciones de iniciadores EcoRI-AAG+MseI-CTG, EcoRI-ACT+MseI-CTG, EcoRI-AGG+MseI-CAG y EcoRI AAC+MseI-CAG, respectivamente. El dendograma presentó cuatro grupos. Los valores de similitud, muestran a los ecotipos PB-270 y PB-277 por un lado y PB-313 y PB-337 como los de mayor heterogeneidad genética, al presentar el valor más bajo de similitud (0.14. Se identificaron y seleccionaron los ecotipos 505 y 596 por su alto potencial forrajero de acuerdo a su variabilidad morfológica.

  5. Arte Público y Memoria Ferroviaria II Paseo de las Esculturas, Bahía Blanca, República Argentina.

    Directory of Open Access Journals (Sweden)

    Diana I. Ribas

    2017-07-01

    Full Text Available En los noventa, la degradación final del sistema ferroviario estatal impulsada por el Presidente Carlos Menem en el marco de una serie de normas neoliberales implicó, paradójicamente, que los restos materiales se convirtieran en una atracción para el arte público regional. En ese entonces, el Museo Municipal de Arte de Bahía Blanca impulsó un Simposio Nacional de Escultura Monumental invitando a diez artistas a utilizar la chatarra de hierro desde el paradigma moderno de arte autónomo. Las obras fueron instaladas en una parte del entubamiento del arroyo Napostá, que fue integrado a otras acciones de planeamiento urbano que valorizaron la zona norte de la ciudad. El nuevo parque lineal comenzó a ser llamado Paseo de las Esculturas. Dos variables reafirman la categoría de arte público en esta activación de la memoria ferroviaria. En primer lugar, el espacio en donde están emplazadas es público, en tanto es de propiedad estatal y, sobre todo, por ser de libre acceso. A su vez, los debates posteriores suscitados por el soporte artístico no tradicional, por la colocación de cercos en tres de las obras y por los costos de la puesta en valor del sector en 2016/17, implican una operación que ha superpuesto una dimensión ideológico-política (esfera pública a la territorial. Por otro lado, en las fuentes documentales la palabra “público” ha sido utilizada en referencia a representaciones sociales vinculadas con la exhibición y la recepción. El carácter duradero de los viejos hierros ferroviarios ha permitido que las formas instaladas en el parque lineal sean constructoras de distintos esquemas intelectuales que, según lo registrado, en su mayoría no han remitido a las historias que han atravesado al material ni a las acciones que desarticularon el sistema de transporte. En síntesis, si bien las esculturas del Paseo introdujeron la no figuración monumental en un sector de la trama urbana bahiense y cumplieron un rol pedag

  6. Comportamiento temporal de la radiación solar global en la ciudad de Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    María Eugenia Fernández

    2015-08-01

    Full Text Available La energía que irradia el Sol es la principal causa de las diferencias climáticas en nuestro planeta y sustenta todos los procesos vitales. Si bien dicha emisión es prácticamente constante para escalas temporales breves, la radiación incidente en cada sitio es variable y depende en gran medida de los estados atmosféricos. En este sentido, la cantidad de cielo cubierto por nubes es un factor primordial, ya que por su capacidad de absorción y reflexión estas pueden reducir sustancialmente la radiación que alcanza la superficie terrestre. El objetivo del presente trabajo es caracterizar el comportamiento de la radiación solar global en la ciudad de Bahía Blanca (Argentina para el período 2001-2011 y comparar los valores radiativos registrados en los años 2007-2011 con datos referidos a coberturas nubosas a fin de establecer relaciones entre ambas variables. La radiación promedio para el intervalo analizado fue de 187,36 W/m 2 . En enero y en diciembre todos los días se registraron radiaciones mayores a 227,4 W/m 2 y en junio y julio la radiación siempre osciló entre 51,5 W/m 2 y 110,1 W/m 2 . En el transcurso del día la radiación alcanza su máximo valor entre las 13:00 h y 13:30 h. En lo que respecta a la relación entre la cobertura nubosa y la radiación global se observaron reducciones de hasta un 10,86 % entre cielos despejados (0 octas y parcialmente nublados (1-5 octas y de hasta 44,35 % entre cielos despejados y cubiertos (6-8 octas. En término medio, los días claros reciben alrededor de un 16 % más de radiación que todos los días en conjunto.

  7. Seletividade alimentar de organismos-alimento por formas jovens de pacu Piaractus mesopotamicus (Holmberg, 1887 e curimba Prochilodus lineatus (Valenciennes, 1836 - DOI: 10.4025/actascibiolsci.v29i2.523 Selective feeding of food organisms by fish larvae of Piaractus mesopotamicus (Holmberg, 1887 and Prochilodus lineatus (Valenciennes, 1836 - DOI: 10.4025/actascibiolsci.v29i2.523

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Bento Fernandes

    2007-12-01

    Full Text Available Objetivou-se avaliar a seleção alimentar de organismos-alimento por formas jovens de pacu (Piaractus mesopotamicus e curimba (Prochilodus lineatus com diferentes idades (6, 12, 19 e 26 dias, na presença e ausência de Pistia stratiotes. Foram utilizados quatro tratamentos (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba e quatro repetições. A cada sete dias, foram coletadas 24 larvas de cada espécie de peixe dos tanques, sendo estas mantidas em jejum por 24 horas. Depois de distribuídas nos aquários com plâncton, as larvas permaneceram por três horas, sendo coletadas e fixadas para análise, juntamente com as amostras de água. Os tratos digestórios das larvas foram retirados e analisados sob microscópio óptico. Observaram-se diferenças estatísticas na seletividade alimentar de organismos planctônicos por larvas de mesma espécie, em diferentes idades e também entre larvas de espécies diferentes, com mesma idade, não diferindo quanto à presença ou ausência de P. stratiotes. As formas jovens de pacu e curimba selecionaram organismos similares aos seis dias de idade, passando por alterações até o 26º dia. À medida que se desenvolveram, as larvas de pacu passaram a selecionar cladóceros e ostrácodos e as de curimba, protozoários e algas.The objective was to evaluate the feeding selection of food organisms for two species of fish larvae (pacu and curimba at different ages (6, 12, 19 and 26 days after eclosion, in the presence or absence of Pistia stratiotes. Four treatments were used (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba and four replications. Every seven days, 24 fish larvae of each species were collected, and kept without food for 24 hours. After being distributed in the aquariums with plankton, the larvae stayed for three hours, and were collected and prepared for analysis, along with the water samples. The digestive tract of the fish larvae

  8. CENTROS HISTÓRICOS NO CONSOLIDADOS: un desafío para la gestión patrimonial. El caso de Bahía Blanca (Argentina

    Directory of Open Access Journals (Sweden)

    Carlos Andrés Pinassi

    2015-10-01

    Full Text Available Este trabajo incluye una serie de reflexiones relativas a diferentes investigaciones realizadas en la ciudad de Bahía Blanca (Rep. Argentina, concernientes al patrimonio cultural y su gestión. El área de estudio la configura el centro histórico de la localidad, definido en el año 1986 en uno de los primeros instrumentos de planificación a escala local, y luego legitimado por el Inventario de Patrimonio Urbano Municipal, llevado a cabo en 1992. Los caracteres propios del espacio determinan la convivencia de sitios patrimoniales con aquellos derivados del proceso de crecimiento de la aglomeración, articulando usos y actividades dispares en un mismo lugar. En este contexto, se identifica un “centro histórico no consolidado” estructurado sobre criterios rígidos, en el que se superponen funcionalidades y se visualizan disímiles unidades de paisaje urbano que carecen de integración.   CENTROS HISTÓRICOS NÃO CONSOLIDADOS: Um desafio para a gestão do patrimônio. O caso de Bahía Blanca (Argentina Resumo Este trabalho inclui uma série de reflexões relacionadas a diferentes investigações realizadas na cidade de Bahía Blanca (Rep. Argentina, concernentes ao patrimônio cultural e à sua gestão. A área de estudo é configurada pelo centro histórico da cidade, definido em 1986, em um dos primeiros instrumentos de planejamento em escala local, e legitimada pelo Inventário do Patrimônio, realizado em 1992. As características específicas do setor mostram a convivência de espaços patrimoniais com aqueles derivados do processo de crescimento da aglomeração, articulando usos e atividades díspares num mesmo sítio. Neste contexto, se identifica um “centro histórico não consolidado” estruturado a partir de parâmetros rígidos, em que se superpõem funcionalidades e se visualizam diferentes unidades de paisagem urbana que carecem de integração.

  9. El rururbano: un espacio de vulnerabilidad y riesgo. Estudio cualitativo en la ciudad de Bahía Blanca, provincia de Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Claudia A. Sereno

    2012-01-01

    Full Text Available El trabajo caracteriza el rururbano -límite externo del periurbano- de la ciudad de Bahía Blanca, provincia de Buenos Aires (Argentina, como un espacio expuesto al crecimiento urbano y como un ámbito de fragilidad y vulnerabilidad para quienes habitan estas zonas. Para ello se puntualiza en el riesgo que corren los residentes del borde frente a la amenaza de modificar sus modos de vida y de perder sus propiedades ante el avance urbano. Los resultados permiten precisar las fortalezas y debilidades de los propietarios rurales y sus modalidades de acción de acuerdo con la exposición a esta expansión y con su arraigo al lugar. La técnica de recopilación es la entrevista semiestructurada a residentes del rururbano.

  10. El rururbano: un espacio de vulnerabilidad y riesgo. Estudio cualitativo en la ciudad de Bahía Blanca, provincia de Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Santarelli Serer Silvia Alicia

    2012-12-01

    Full Text Available El trabajo caracteriza el rururbano —límite externo del periurbano— de la ciudad de Bahía Blanca, provincia de Buenos Aires (Argentina, como un espacio expuesto al crecimiento urbano y como un ámbito de fragilidad y vulnerabilidad para quienes habitan estas zonas. Para ello se puntualiza en el riesgo que corren los residentes del borde frente a la amenaza de modificar sus modos de vida y de perder sus propiedades ante el avance urbano. Los resultados permiten precisar las fortalezas y debilidades de los propietarios rurales y sus modalidades de acción de acuerdo con la exposición a esta expansión y con su arraigo al lugar. La técnica de recopilación es la entrevista semiestructurada a residentes del rururbano.

  11. Belonging out of Context: the Intersection of Place, Networks and Ethnic Identity among Retired British Migrants Living in the Costa Blanca

    Directory of Open Access Journals (Sweden)

    Anya AHMED

    2011-11-01

    Full Text Available Intra-European migration is now a well-documented phenomenon among older people and for UK retirees, Spain is the most popular choice. ‘Belonging’ is particularly important when attempting to understand experiences of migration since often people become aware that they need to belong precisely when they realise that they do not. However, although belonging is a recurrent theme in identity and migration discourse it is rarely defined. This paper explores the concept of belonging in relation to the experiences of a group of retired women living in the Costa Blanca in Spain and considers its multiple and overlapping representations. The myriad forms of belonging that these ‘lifestyle migrants’ construct through narrative in relation to place, networks and ethnic identity and the central intersecting role of language are considered and discussed.

  12. Estimaciones del tráfico urbano de pasajeros de colectivos de Bahía Blanca, Argentina. 2007-2014

    Directory of Open Access Journals (Sweden)

    Valentina Natividad-Viego

    2017-01-01

    Full Text Available En este artículo se realiza una estimación de los determinantes de la demanda de transporte urbano de pasajeros por colectivo de la ciudad de Bahía Blanca, para tal fin se recabaron datos mensuales del periodo 2007-2014. Se utilizan técnicas de panel de datos con efectos fijos, que admiten heterogeneidad entre líneas y mejoran la precisión de las estimaciones. La estimación permite obtener elasticidades respecto de la tarifa, del costo de desplazarse en medios alternativos y analizar el rol del nivel general de precios en el volumen de pasajeros que viajan en colectivo.

  13. IMPLANTACIÓN DE ENERGIAS RENOVABLES Y ESTIMACIÓN DE LA HUELLA DE CARBONO EN EL MUNICIPIO DE BLANCA (MURCIA

    Directory of Open Access Journals (Sweden)

    José Molina Ruiz

    2012-01-01

    Full Text Available La introducción del concepto de sostenibilidad en el mercado energético implica la potenciación de las energías renovables activando políticas que fomenten su implantación. El éxito de estas políticas se plasmará en el incremento de participación de las energías renovables en el mix energético, en la reducción de emisiones de CO2 y en el cumplimiento de los compromisos internacionales. Este trabajo analiza el grado de implantación de las energías renovables en un municipio de la Región de Murcia (Blanca, valorando la incidencia de la legislación sectorial energética y estimando la huella de carbono derivada del consumo de energía eléctrica.

  14. [Acanthamoeba sp. keratitis: first case confirmed by isolation and molecular typification in Bahía Blanca, Buenos Aires Province, Argentina].

    Science.gov (United States)

    Gertiser, M L; Giagante, E; Sgattoni, E; Basabe, N; Rivero, F; Luján, H; Occhionero, M; Paniccia, L; Visciarelli, E; Costamagna, S R

    2010-01-01

    Some species of the Acanthamoeba genus cause keratitis, a very painful, most likely unilateral corneal infection , associated with eye and vision impairment. We here present a case of a 31-year-old female patient, a regular user of soft contact lenses without good practices of lens hygiene and handling. The patient attended medical consultation after two months of inflammation and pain in her right eye. After ophthalmological studies, and due to suspicion of a parasitic infection, a biopsy was performed and the sample submitted for bacteriological and parasitological analyses. Moreover, contact lens holders and lens cleaning solutions were studied. The samples yielded negative results for bacterial infection. However, cultivation of all samples showed the presence of amoeboid parasites. Isolated amoebae were morphologically and molecularly classified as members of the Acanthamoeba genus. This is the first case of keratitis caused by Acanthamoeba in Bahía Blanca, Buenos Aires Province, where the parasite was identified by specific and sensitive molecular techniques.

  15. MUJERES Y BENEFICENCIA: REPRESENTACIONES DE GÉNERO EN LA PRENSA CATÓLICA DE BAHÍA BLANCA A PRINCIPIOS DEL SIGLO XX

    Directory of Open Access Journals (Sweden)

    Lucía Bracamonte

    2016-01-01

    Full Text Available El objetivo del presente artículo es identificar y describir las representaciones de género en torno a la participación de las mujeres en sociedades benéficas presentes en el discurso de la prensa confesional que apareció en Bahía Blanca y circuló por su zona de influencia durante las tres primeras décadas del siglo XX. Considerando que el periodismo, en su carácter de medio de comunicación masiva, influye en la vida comunitaria sometiendo a discusión lo legítimo y lo ilegítimo dentro del sistema de género imperante, se analizarán las definiciones sexuales presentes en los artículos referidos al tema en su título y/o contenido publicados en Arte y Trabajo, El Mensajero, Renovación, Bandera Blanca y Un paso más. Los/as católicos/as compartían el concepto de diferencia sexual extendido en la época y abordaban la “cuestión de la mujer” centrándose en las nociones de domesticidad y maternidad. Algunos/as de ellos/as reformularon estas nociones frente a los procesos de modernización que impactaron sobre las mujeres, expresando algunas ideas que, si bien no tuvieron en sí mismas la intención de subvertir las relaciones de género, avalaron ciertas mutaciones de signo moderno en la condición femenina, entre ellas, las que implicaban una inserción pública a través de la beneficencia.

  16. Fenología de la floración de Ulmus pumila L. (Ulmaceae en la ciudad de Bahía Blanca (Argentina

    Directory of Open Access Journals (Sweden)

    Lucia Saveanu

    2015-07-01

    Full Text Available La fenología es el estudio de los fenómenos periódicos que ocurren en los seres vivos y sus relaciones con condiciones ambientales como luz, temperatura, humedad, etc. Los objetivos de este trabajo fueron describir las fases fenológicas durante la fl oración deUlmus pumilaL. para la ciudad de Bahía Blanca y relacionar la floración con datos meteorológicos de temperaturas mínimas y máximas. Durante dos periodos de floración (julio a septiembre, de 2007 y de 2008 se realizaron observaciones fenológicas semanales de ejemplares deU. pumilapresentes en el arbolado urbano de la ciudad. La fl oración se observó en los meses de julio y agosto, registrándose la máxima floración el 23 y el 7 de agosto de 2007 y 2008, respectivamente. Durante la floración del año 2007 la cantidad de flores registradas y la duración de la fase de floración fueron superiores a lo ocurrido en 2008. Estos resultados ayudan a conocer la dinámica de floración de U. pumila en la ciudad de Bahía Blanca, y a largo plazo contribuirá a la interpretación de los cambios climáticos de la región y a una mejor prevención de las alergias.

  17. La construcción televisiva de la identidad valenciana contemporánea: memoria y costumbrismo regionalista en l’Alqueria Blanca

    Directory of Open Access Journals (Sweden)

    Àlvar Peris Blanes

    2015-10-01

    Full Text Available Este artículo tiene como objetivo analizar de qué modo la ficción valenciana L’Alqueria Blanca, uno de los grandes fenómenos de la televisión pública autonómica de los últimos años, ha consolidado la “naturalización” de una identidad valenciana regionalista que, desde la Transición democrática, es aceptada por una mayoría social como la identidad colectiva preferente. Observaremos cómo la serie elabora un discurso memorístico sobre el pasado que entronca con el relato sobre la identidad valenciana surgido en el siglo XIX y lo lanza al presente, reforzando proyectos políticos e ideológicos concretos.Palabras clave: identidad valenciana, nacionalismo banal, ficción televisiva, Canal 9, memoria._______________________Abstract: This article aims to analyze how Valencian fiction L'Alqueria Blanca, one of the great phenomena of the regional public television in recent years, has naturalized a Valencian regionalist identity which, since the democratic Transition, is accepted by most as the preferred social collective identity. We’ll try to observe how the series develops a rote speech about the past that connects with the story of the Valencian identity emerged in the nineteenth century which has been thrown to the present, strengthening political and ideological concrete projects.Keywords: Valencian identity, banal nationalism, TV drama, Canal 9, memory.

  18. La norma y la práctica en el centro socialista de Bahía Blanca: afiliaciones, cotizaciones, bajas y renuncias (1911-1919

    Directory of Open Access Journals (Sweden)

    Cabezas, Gonzalo Ezequiel

    2014-12-01

    Full Text Available Resumen Este artículo es un estudio de caso en clave microanalítica, que analiza las prácticas de afiliación, cotización, baja y renuncia en el centro socialista de Bahía Blanca en 1911-1919, contrastando cómo debía ser el procedimiento formal según las normas y/o costumbres establecidas en el partido y cómo era el habitual, junto con las razones de los afiliados para justificar que la práctica se alejara de la norma. Proponemos entender las prácticas dentro del continuum que va de lo formal a lo informal (de las reglas a los procedimientos cotidianos, en un intento por trascender la dicotomía entre accionar “tradicional y moderno” (signo del atraso y del progreso respectivamente, común en los estudios sobre partidos políticos en general y sobre socialismo en particular. Abstract This article is a case study in microanalytical key, which analyzes the practices of affiliation, contribution, unenlisting and resignation in the socialist center of Bahía Blanca in 1911- 1919, contrasting how should be the formal procedure according to the rules and/or costumes established in the party and how was the usual one, along with the reasons of the affiliates to justify that the practice moved away from the norm. We propose to understand the practices within the continuum that goes from formal to informal (from the rules to the usual procedures, in an attempt to transcend the dichotomy between “traditional and modern” action (sign of backwardness and progress respectively, common in studies of political parties in general and of socialism in particular.

  19. Sperm motility and velocities of Characiformes fishes in different times post-activation

    Directory of Open Access Journals (Sweden)

    Mônica Aline Parente Melo-Maciel

    2015-12-01

    Full Text Available The objective of the current study was to observe the performance kinetics (motilities and velocities of the spermatozoa from Prochilodus brevis (curimatã, Colossoma macropomum (tambaqui and Piaractus brachypomus (pirapitinga species in different times post-activation. The sperm of P. brevis, C. macropomum and P. brachypomus species were collected after hormonal induction with carp pituitary extract. The samples with not contamination with water, urine or feces had motility subjective, morphology, osmolality and concentration analyzed. The samples selected were analyzed with Sperm Class Analyzer. Spermatozoa motility and velocities were captured at 10, 30, 60 and 120 s post-activation. No significant differences in total motility of P. brevis spermatozoa were observed between 10 s and 30 s post-activation. However, significant reduction was observed in 60 s. This reduction was more accentuated after 120 s. The same pattern of spermatozoa motility decline happened for C. macropomum and P. brachypomus. Velocities also followed the same pattern for the three species. There was significant reduction in velocities after 30 s; this reduction was more significant after 60 s. There was no significance difference between 60 s and 120 s post-activation. Sperm of C. macropomum and P. brachypomus show satisfactory sperm quality up to 60 s after activation. On the other hand, sperm of P. brevis up to 120 s after activation. These findings show that the rate of sperm motility in different times post activation is change for each species tested.

  20. Suplementação com DL-α acetato de tocoferila e parasitismo por Anacanthorus penilabiatus (Monogenea: Dactylogyridae em Piaractus mesopotamicus (Osteichthyes: Characidae - DOI: 10.4025/actascianimsci.v27i1.1244 Supplementation with DL-α tocopheryl acetate and parasitism by Anacanthorus penilabiatus (Monogenea: Dactylogyridae in Piaractus mesopotamicus (Osteichthyes: Characidae - DOI: 10.4025/actascianimsci.v27i1.1244

    Directory of Open Access Journals (Sweden)

    Vando Edésio Soares

    2005-03-01

    Full Text Available O índice de parasitismo por Anacanthorus penilabiatus foi estudado em 126 pacus jovens, Piaractus mesopotamicus (peso inicial de 95,71 ± 24,23 g e peso final 155,76 ± 28,62 g, provenientes de mesma desova, naturalmente parasitados. Os peixes foram distribuídos aleatoriamente em três tratamentos de 42 animais cada e submetidos à suplementação com zero mg, 100 mg e 450 mg de DL-α acetato de tocoferila/kg de ração, alimentados duas vezes ao dia, por 18 semanas. Após este período, as brânquias foram avaliadas quanto à presença do parasito e amostras de sangue coletadas. Apesar de 100% dos pacus analisados apresentarem monogenea, não se observou diferença estatística (p > 0,05 quanto ao índice de parasitismo entre os grupos. Todavia, os animais que receberam a vitamina E apresentaram menores contagens de parasitos nas brânquias. Da mesma forma, os peixes alimentados com baixos níveis de vitamina E não diferiram estatisticamente (p > 0,05 dos tratados com DL-α acetato de tocoferila (100 mg/kg e 450 mg/kg quanto à contagem global de eritrócitos, hematócrito e volume corpuscular médio. A suplementação alimentar com vitamina E não interferiu no desempenho produtivo de pacusThe rates of Anacanthorus penilabiatus parasitism were investigated in 126 pacus, (Piaractus mesopotamicus -with initial weight of 95.71 ± 24.23 g and final weight of 155.76 ± 28.62 g, from the same spawn and naturally infested. Fishes were randomly distributed among three groups of 42 animals each and submitted to treatment with 0, 100 and 450 mg of DL-α tocopheryl acetate/Kg of dry diet, fed twice a day during 18 weeks. The gills were evaluated according to the presence of parasites and collected blood samples. Although 100% of pacus examined were parasited, the results did not show statistical difference (P > 0.05 for parasite counting among the groups treated. Therefore, fish supplemented with vitamin E demonstrated lower parasites counts. In the

  1. “El marketing turístico del patrimonio cultural como alternativa de desarrollo del centro histórico de Bahía Blanca (Argentina. Diagnóstico de situación.”

    Directory of Open Access Journals (Sweden)

    Andrés Pinassi

    2012-06-01

    Full Text Available El presente trabajo forma parte del Proyecto General de Investigación: “Turismo y desarrollo: nuevos escenarios en la gestión integral de destinos turísticos en el Sudoeste bonaerense. Parte II”, que se lleva a cabo en el Departamento de Geografía y Turismo de la Universidad Nacional del Sur (Bahía Blanca, Argentina. El mismo tiene como objetivo: presentar un diagnóstico integral acerca de la utilización del centro histórico de la ciudad de Bahía Blanca como espacio de ocio, concentrador del patrimonio cultural local. Dicho análisis forma parte del Plan de Marketing Turístico desarrollado para el sector urbano bajo estudio, con el fin de dotarlo de mayor dinamismo y consolidarlo como lugar de encuentro, tanto para residentes como visitantes.

  2. Caracterización fisicoquímica y biológica de la calidad de aguas de la cuenca de la quebrada Piedras Blancas, Antioquia, Colombia

    Directory of Open Access Journals (Sweden)

    José A. Posada G.

    2000-03-01

    Full Text Available Entre abril y diciembre de 1996, se llevó a cabo un estudio limnológico de 17 quebradas ubicada en el área del Parque Piedras Blancas (6° 8' 20''N, 75° 30' 20''Wlocalizado al SE de Medellín a 2 400 m de altura. El estudio se realizó en 35 estaciones de muestreo y se establecieron tres períodos de muestreo: el primero entre abril y mayo, el segundo de agosto a septiembre y el tercero de octubre a diciembre de 1996. La finalidad del mismo era establecer la calidad ecológica de las aguas ubicadas en el área del Parque. Para la recolección cualitativa de los macroinvertebrados se utilizaron las redes D-net y de pantalla. El área de muestreo en cada estación fue de 6 m2. Las variables fisicoquímicas mostraron fluctuaciones bajas a lo largo del estudio, excepto la conductividad y los sólidos totales, cuyos cambios estuvieron relacionados con la alta pluviosidad durante el período de estudio. La comunidad de macroinvertebrados encontrada, estuvo conformada por 113 géneros, pertenecientes a 63 familias y siete Phyla, siendo el orden Tichoptera el más abundante. El área de muestreo en cada estación fue de 6 m². El resultado del estudio muestra como la cuenca de la quebrada Piedras Blancas presenta condiciones que pueden clasificarse en términos generales como oligo-mesotróficas.From April to December 1996 a limnological study was carried out in 17 streams near Medellín, in order to stablish their water quality. The area is located in Piedras Blancas Park (6° 8' 20''N, 75° 30' 20''W SE of Medellín at 2 400 m altitude. Three sampling periods, encompasing wet and dry seasons were selected: April-May, August-September and October-December. For qualitative collection methods hand screen D-net were used. Each station was intensively sampled to collect most macroinvertebrates in all types of habitat. The area sampled in each station was 6 m². Physicochemical variables in general showed small fluctuations along the study; only

  3. Proglacial Hydrogeology of the Cordillera Blanca (Peru): Integrating Field Observations with Hydrogeophysical Inversions to Inform Groundwater Flow Simulations and Conceptual Models

    Science.gov (United States)

    Glas, R. L.; Lautz, L.; McKenzie, J. M.; Moucha, R.; Mark, B. G.

    2017-12-01

    Geological and depositional conditions of the glaciated Cordillera Blanca in Peru have given way to proglacial aquifer systems that contribute substantially to regional streams and rivers, particularly during the dry season. As glacial retreat accelerates, the dry season water budget will be increasingly dominated by groundwater inputs, although predictions of future groundwater quantities require estimations of groundwater storage capacity, aquifer extents, and groundwater residence time. We present a characterization of the sediment structure in a prototypical proglacial valley in the central portion of the range, the Quilcayhuanca Valley. Northern and Central valleys of the Cordillera Blanca feature ubiquitous talus deposits that line the steep granite walls, and have become partially buried beneath lacustrine sediments deposited in proglacial lake beds. The portion of the talus still exposed near the valley walls provides recharge to deeper portions of the valley aquifers that underlie lacustrine clay, resulting in a confined aquifer system that is connected to the surface via perennial springs. Seismic refraction surveys reveal an interface separating relatively slow ( 400-800 m/s) and fast ( 2500 m/s) p-wave velocities. The depth of this refractor coincides with the depth to buried talus observed in drilling records. Electrical resistivity tomography profiles of the same transect show depths near the buried talus to be relatively conductive (10-100 Ωm). At these depths, we hypothesize that electrical conductance is elevated by saturated clay particles in the sediment matrix of the talus deposit. The resistivity models all show a more resistive ( 700 Ω m) region at depth, likely corresponding to a more hydraulically conductive material. The resistive zone is interpreted to be a deeper portion of a buried talus deposit that did not accumulate clay in the matrix. Other possibilities include a thick deposit of gravelly glacial outwash, or a relatively clay

  4. ESCORRENTÍA SUPERFICIAL EN BOSQUES MONTANOS NATURALES Y PLANTADOS DE PIEDRAS BLANCAS, ANTIOQUIA (COLOMBIA SURFACE RUNOFF IN NATURAL MONTANE FORESTS AND FOREST PLANTATIONS IN ANTIOQUIA, COLOMBIA

    Directory of Open Access Journals (Sweden)

    Oscar Andrés Ruiz Suescún

    2005-06-01

    Full Text Available En bosques montanos naturales de roble (Quercus humboldtii Bonpl. y plantados de pino pátula (Pinus patula Schltdl. & Cham. y ciprés (Cupressus lusitanica Mill. de la región de Piedras Blancas, Antioquia (Colombia, fueron medidos los flujos de escorrentía superficial (ES por un periodo de tiempo de 16 meses. Se implementaron parcelas cerradas de escorrentía superficial de 10 m de largo x 2 m de ancho, tanques colectores y sistemas de registro volumétrico. Los flujos fueron de 23,19 mm año-1 (1,07 % de la precipitación para la cobertura de roble; 35,13 mm año-1 (1,61 % de la precipitación para la cobertura de pino pátula y 230,64 mm año-1 (11,05 % de la precipitación para la cobertura de ciprés. Mediante análisis de componentes principales (ACP se identificaron las relaciones existentes entre las variables hidrológicas y los flujos de ES, y por medio de análisis de regresión lineal múltiple se ajustaron modelos para los flujos de ES por cobertura en función de la precipitación, la precipitación en el bosque y la intensidad de lluvia promedio, variables que mostraron alta relación con la ES según el ACP.In natural montane oak forests (Quercus humboldtii Bonpl., in pine (Pinus patula Schltdl. & Cham. and cypress (Cupressus lusitanica Mill. plantations in Piedras Blancas, Antioquia (Colombia, surface runoff flows (SRF were measured over 16 months. Runoff was measured using 10 m long x 2 m wide runoff bounded plots, collector tanks and a volumetric counter system. SRF were 23,19 mm year -1 (1,07 % of rainfall for oak forest; 35,13 mm year -1 (1,61 % of rainfall for pine and 230,64 mm year-1 (11,05 % of rainfall for cypress plantations. Relationships between hydrological variables and SRF were identified by a principal components analysis (PCA. For each one of the stands, multiple regression analysis was used to fit models of SRF on rainfall, throughfall and mean intensity of rainfall, variables that, according to the PCA

  5. Detección molecular y análisis filogenético de Hepatozoon canis (Eucoccidiorida: Haemogregarinidae en perros clínicamente sanos de Bahía Blanca (Buenos Aires

    Directory of Open Access Journals (Sweden)

    CICUTTIN GL

    2017-06-01

    Full Text Available Las enfermedades caninas causadas por protozoarios y transmitidas por garrapatas representan un importante problema en medicina veterinaria. El objetivo del estudio fue detectar molecularmente Hepatozoon spp., Babesia spp. y Theileria spp. en perros clínicamente sanos de distintas regiones de Argentina y analizar la diversidad genética de los hallazgos obtenidos. Se analizaron 163 muestras de ADN de sangre de perros (40 de Ciudad Autónoma de Buenos Aires; 33 de Bahía Blanca, Buenos Aires; 15 de Castelli, Chaco; 27 de Salsipuedes, Córdoba; 40 de Merlo, San Luis; y 8 de San Miguel, Corrientes. Mediante una PCR que amplifica un fragmento variable (460-540 pb del gen ARNr 18S incluyendo la región V4 de los géneros Hepatozoon, Babesia y Theileria, el 12,1 % (4/33 de los perros de Bahía Blanca (Buenos Aires resultaron positivos. Las secuencias obtenidas se identificaron como Hepatozoon canis y resultaron filogenéticamente similares a hallazgos en Sudamérica y en el resto del mundo. El estudio de H. canis en Argentina mediante técnicas moleculares de diagnóstico junto con el análisis filogenético resulta de suma importancia para conocer la situación de este patógeno en el país. SUMMARY. Molecular detection and phylogenetic analysis of Hepatozoon canis (Eucoccidiorida: Haemogregarinidae infecting healthy dogs from Bahia Blanca (Buenos Aires. Tick-borne protozoan canine diseases represent a major problem in veterinary medicine. The aim of the study was to detect molecularly Hepatozoon spp., Babesia spp. and Theileria spp. in clinically healthy dogs from different regions of Argentina and to analyze the genetic diversity of the findings. DNAs extracted from 163 blood samples from dogs (40 from Buenos Aires city; 33 from Bahia Blanca, Buenos Aires; 15 from Castelli, Chaco; 27 from Salsipuedes, Córdoba; 40 from Merlo, San Luis; and 8 of San Miguel, Corrientes were studied by PCR amplifying a variable fragment (460-540 bp of the 18S r

  6. Motilidade espermática de sêmen de peixes criopreservado em diferentes meios avaliada por método subjetivo e computadorizado

    OpenAIRE

    Nascimento, Ariane Flávia do

    2014-01-01

    A pirapitinga (Piaractus brachypomus) e a curimba (Prochilodus lineatus) são espécies de peixe da ordem Characiforme, de importância econômica e ecológica. Os objetivos do presente estudo foram (a) avaliar diferentes meios de congelamento para o sêmen de ambas as espécies; (b) comparar a motilidade espermática após o descongelamento avaliada pelo método subjetivo ao microscópio de luz, bem como pelo método computadorizado SCA®, em ambas as espécies; (c) determinar as velocidades espermáticas ...

  7. Influência do sexo do animal e do sistema de produção nas características de carcaça de caprinos da raça Blanca Serrana Andaluza Influence of animal gender and production system on the carcass characteristics of goats of the Blanca Serrana Andaluza breed

    Directory of Open Access Journals (Sweden)

    Roberto Germano Costa

    2010-02-01

    Full Text Available Objetivou-se avaliar a influência do sexo e do sistema de produção nas características de carcaça de caprinos da raça Blanca Serrana Andaluza. Foram utilizados 31 animais, 12 machos e 19 fêmeas, distribuídos nos sistemas de produção intensivo (15 animais e extensivo (16 animais. Não foi observada diferença no desempenho, no peso de carcaça e no escore corporal entre os sexos nem entre os sistemas de produção, contudo, os rendimentos de carcaça quente e fria foram maiores nos animais terminados em confinamento. As medidas de carcaça não diferiram entre os sistemas de produção, exceto o comprimento interno, que foi maior nos animais criados no sistema intensivo. O percentual dos não-constituintes da carcaça sofreu pouca variação em relação ao sexo e aos sistemas de criação avaliados. As maiores proporções de gordura perirrenal foram encontradas nas fêmeas e nos animais produzidos em confinamento. Pouca variação foi observada para os cortes paleta, pescoço e serrote, embora o percentual de perna tenha sido maior nos animais produzidos a pasto. O sistema extensivo, predominantemente usado por criadores da raça Blanca Serrana Andaluza na Espanha, permite obter carcaças com características similares às dos animais criados em confinamento e, em virtude da significativa redução dos custos com alimentação, obtida com os animais exclusivamente a pasto, pressupõe-se que esse sistema seja mais economicamente viável.The objective of this study was to evaluate the influence of gender and production system on the carcass characteristics of Blanca Serrana Andaluza goats. Thirty-one animals were used, 12 males and 19 females, distributed in intensive (15 animals and extensive (16 animals production systems. No difference was observed in performance, carcass weight and body score between the gender or production system but the hot and cold carcass yields were greater for the animals finished in a feedlot. The carcass

  8. Para una sociología del racismo: análisis comparativo de las pautas de matrimonio entre personas de raza blanca y negra

    Directory of Open Access Journals (Sweden)

    RUTH AGUILERA

    1992-01-01

    Full Text Available Existen diferentes maneras de analizar los prejuicios y las discriminaciones raciales. Uno de los mejores indicadores sociales es el matrimonio interracial (por ejemplo, entre razas negra y blanca, que sobrepasa los límites de los grupos establecidos mediante los procesos de racialización. Ante este fenómeno se hace necesario redefinir las nociones de raza, género y cultura en las vidas individuales, así como a nivel social y político. En el artículo se analizan algunos de esos conceptos e indicadores. Se estudian las tasas de matrimonios interraciales como un indicador significativo de la armonía en las relaciones raciales. A partir de esos datos se exponen las teorías existentes y posibles explicaciones del matrimonio entre blancos y negros, utilizando datos recientes de Estados Unidos y Gran Bretaña, analizando también la dinámica de la racionalización en ambos países. Al final se añaden ideas de algunos de los principales estudios españoles.

  9. The Role of Insolation and the Equatorial Pacific in South American Climate during the Holocene: A Paleoclimate Record from Laguna Blanca, Venezuela

    Science.gov (United States)

    Polissar, P. J.; Abbott, M.; Wolfe, A. P.; Bezada, M.; Vuille, M.

    2009-12-01

    Insolation forcing of tropical climate at precessional timescales appears to be a widespread phenomenon in South America. This could reflect the influence of local insolation changes on rainfall and evaporation, and hence migration of the marine intertropical convergence zone (ITCZ) and its terrestrial expression, the South American summer monsoon. However, modern interannual climate variability in South America is also closely linked to ocean-atmosphere interactions in the tropical Pacific expressed primarily as the El Niño-Southern Oscillation (ENSO). The timing of climate changes in the Northern and Southern Hemisphere tropics is one way to distinguish between these mechanisms. Precessional forcing of Atlantic ITCZ migration would cause changes in the northern and southern hemispheres that are opposite in sign. In contrast, ENSO variability has a similar character in the Andean regions of both hemispheres. Here we develop a new terrestrial paleoclimate record in the northern tropics of South America. Lake level fluctuations from Laguna Blanca, located in the Venezuelan Andes, exhibit arid-humid intervals during the past 10,000 years that occur at the same time as those in the neotropics of both hemispheres. This pattern suggests that millennial-scale climate trends in Andean South America may reflect changes in the mean state and variability of the equatorial Pacific Ocean.

  10. Rodados bioerosionados en depósitos marinos holocenos del estuario de Bahía Blanca, Argentina: consideraciones paleoambientales y procedencia

    Directory of Open Access Journals (Sweden)

    Jorge O Spagnuolo

    2013-07-01

    Full Text Available En la costa norte del estuario de Bahía Blanca, provincia de Buenos Aires, Argentina, se presentan cordones litorales compuestos por arena conchilífera y elevada proporción de rodados de origen sedimentario. Muchos de estos clastos muestran importantes signos de bieorosión. La procedencia de este material se vincula con las extensas plataformas de abrasión presentes al este del estuario (costas de Pehuén Co. Se determinaron dos icnofacies: la icnofacies de Trypanites integrada por Gastrochaenolites, Maeandropolydora, Trypanites, Gnathichnus y Radulichnus, propia de sustratos duros y la icnofacies de Skolithos representada por galerías de Ophiomorpha desarrollada en sustratos blandos. Ambas, caracterizan un ambiente litoral somero. Durante la transgresión holocena, los sustratos costeros se vieron afectados por el avance marino y los fragmentos erosionados fueron transportados por deriva litoral hacia el interior del estuario. Finalmente, eventos de tormenta depositaron en los cordones litorales el material con signos de bioerosión. En la actualidad, muchos de estos rodados que presentan gradación en tamaño hacia el interior del estuario, se hallan en tránsito en las playas por deriva litoral este-oeste.

  11. Mujeres benefactoras en el sudoeste bonaerense argentino: el caso del Patronato de la Infancia de Bahía Blanca, 1906-1931

    Directory of Open Access Journals (Sweden)

    Lucía Bracamonte

    2012-01-01

    Full Text Available El cuidado de los menores considerados en riesgo moral y material en la Argentina de principios del siglo XX queda muchas veces a cargo de instituciones de caridad en las cuales las benefactoras adquieren especial protagonismo. El objetivo del presente artículo es identificar las funciones asumidas por las mujeres en el periodo de surgimiento y afianzamiento del Patronato de la Infancia de Bahía Blanca, caracterizándolas en el marco de las relaciones que establecen con las personas que las rodean, así como de las representaciones de género emergentes de las mismas. Cabe preguntarse de qué manera se definen, a partir de las prácticas y los discursos vinculados con el caso analizado, los lugares ocupados por las benefactoras en relación a los hombres de su círculo social y a otras mujeres de distintos estratos y ocupaciones que se involucran con la institución, como las amas de leche y las religiosas. Se plantea que la actuación de las propulsoras de este emprendimiento representa en muchos sentidos una transgresión a los modelos imperantes de femineidad pero que, sin embargo, tanto los discursos de los hombres como los de las mujeres asocian sus actividades con esos presupuestos dominantes.

  12. Influence of Experimental Thermal Shifts and Overcrowding on Fecundity in Wild Females of Acartia Tonsa of the Bahía Blanca Estuary

    Directory of Open Access Journals (Sweden)

    Berasategui Anabela Anahi

    2014-09-01

    Full Text Available The copepod Acartia tonsa plays an important role in the food web of many estuaries influenced by changes due to anthropic activities, hence it is relevant to know its reproductive plasticity under stressful conditions. We examined the influence of thermal shift (6 ± 1ºC and 18 ± 1ºC and overcrowding stress on egg production and hatching success in wild females of A. tonsa of the Bahía Blanca Estuary. Egg production rate (EP, hatching success during seven days (E7 % and time taken to hatch 50 % of eggs (T 50 were registered. The high individual density used in the incubations caused a decrease in EP values at both temperatures. Nevertheless, all the females responded favorably to 18°C. EP and E7 % obtained at both temperatures were significantly different the values at 18ºC, being twice as high as those obtained at 6°C. T 50 values at 18ºC indicated a shorter developmental time in eggs from spring females, whereas the opposite effect was observed in eggs from winter females. Our results indicate that the reproductive performance is affected by short exposures to thermal shift. The pattern of egg production and hatching is also modified in accordance with the maternal history.

  13. La actividad turísticorecreativa en la reestructuración del espacio urbano. El caso de una ciudad media: Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    Romina Valeria Schroeder

    2011-11-01

    Full Text Available Muchas de las políticas urbanas han incorporado, recientemente, una posición proactiva hacia el turismo y la actividad recreativa, que se ve cada vez más como un sector estratégico para la revitalización urbana en determinados sectores de la ciudad. El presente artículo propone una reflexión acerca de la incidencia de la actividad turístico-recreativa en espacios urbanos, como inductora de un proceso de desarrollo local. Se plantea como caso de estudio Bahía Blanca (Provincia de Buenos Aires, Argentina, centro urbano intermedio con preponderancia regional, que procura insertarse entre las ciudades que se orientan a promover actividades propias del turismo y la recreación. Varias son las acciones realizadas en este sentido, poniendo de relieve, por un lado, los diferentes proyectos y planes urbanos que se desarrollaron y, por el otro, los cambios sociales y la renovación urbana que impulsaron. Si bien el estudio de esta temática se encuentra en su etapa inicial1, el trabajo plantea interrogantes acerca de las transformaciones urbanas actuales y cómo éstas se vinculan a la dinamización de un territorio, a partir de la actividad turístico-recreativa.

  14. Abundance and species composition of planktonic Ciliophora from the wastewater discharge zone in the Bahía Blanca Estuary, Argentina

    Directory of Open Access Journals (Sweden)

    María Sonia Barría de Cao

    2003-09-01

    Full Text Available The specific composition and abundance variation of the ciliate community from a wastewater discharge zone in the Bahía Blanca estuary, Argentina, were studied all throughout a year, from June 1995 to May 1996. The polluted area exhibited high values of particulate organic matter and nutrients, particularly phosphates. Aloricate ciliates were represented by 15 species belonging to the genera Strombidium Claparède & Lachmann, 1859; Strombidinopsis Kent, 1881; Cyrtostrombidium Lynn & Gilron, 1993; Strobilidium Schewiakoff, 1983; Lohmmanniella Leegaard, 1915 and Tontonia Fauré-Fremiet, 1914. Tintinnids were represented by nine species belonging to the genera Tintinnidium Kent, 1881, Tintinnopsis Stein, 1867 and Codonellopsis Jörgensen, 1924. The total abundance of aloricate ciliates reached a peak of 1,800 ind. 1-1 and the total abundance of tintinnids reached a peak of 9,400 ind. 1-1. Tintinnidium balechi Barría de Cao, 1981 was the most abundant ciliate in the community. Considerations on the presence and abundance of ciliates are made in relation to physicochemical and biochemical parameters.

  15. Población de mosca blanca en tomate cultivado a campo con pantallas de sombreamiento Whitefly population in shaded tomato field

    Directory of Open Access Journals (Sweden)

    Daniel Sánchez

    2005-02-01

    Full Text Available El objetivo de este trabajo fue analizar la población de mosca blanca Trialeurodes vaporariorum, Westwood (Hemiptera: Aleyrodidae en tomate de verano en cultivos con sombreado, en Santa Fe, Argentina. Se transplantó tomate en hileras cubriendo un sector con malla negra de polipropileno, realizándose cada tres días, en 30 plantas un recuento de adultos en una hoja superior y de ninfas en diez folíolos al azar. El diseño experimental fue de bloques al azar analizándose la correlación entre la temperatura y la evolución de adultos y ninfas. El sombreado disminuyó la temperatura, pero incrementó diez veces la densidad de adultos y cinco veces la de ninfas respecto al cultivo al aire libre.In Santa Fe, Argentina, whitefly (Trialeurodes vaporariorum, Westowood (Hemiptera: Aleyrodidae populations were monitored during summer in shaded and non shaded tomato field. Tomato was transplanted in rows and half of crop surface was shaded with a black polypropilen layer. Whitefly population was monitored at three-day intervals in 30 plants. Adult whiteflies were surveyed in the highest developed leaf and immature stages in 10 random leaflets in each plant. Experimental design was in randomized blocks and the correlation was calculated among temperature and number of adults and nymphs. In shaded tomato, temperature was lower but whitefly adult populations increased ten times and immature stages increased five times.

  16. Moscas blancas y enemigos naturales asociados al cultivo de naranja bajo dos tipos de manejo sanitario en San Pedro, provincia de Buenos Aires

    Directory of Open Access Journals (Sweden)

    Silvia N. LÓPEZ

    2017-01-01

    Full Text Available Las moscas blancas (Hemiptera: Aleyrodidae son importantes plagas que afectan al género Citrus. En este trabajo se identificaron las especies presentes en naranjos de San Pedro (provincia de Buenos Aires y se analizó su evolución poblacional y la de sus enemigos naturales bajo dos manejos sanitarios (convencional y orgánico. Mensualmente se registró la densidad de adultos y ninfas, la especie y densidad de parasitoides y predadores, la presencia de fumagina en hojas/frutos, el rendimiento y los agroquímicos aplicados. Las principales especies fueron Dialeurodes citri (Ashmead y Singhiella citrifolii (Morgan, cuyas poblaciones de adultos predominaron entre octubre y mayo, sin diferencias entre los tipos de manejo. Las ninfas estuvieron presentes a lo largo del año, con mayores cantidades en los cultivos orgánicos. Los niveles de fumagina fueron similares para ambos manejos. El predador Euseius concordis (Chant (Acari: Phytoseiidae fue el enemigo natural más abundante, con mayor densidad en los cultivos orgánicos. Hubo bajos niveles de parasitismo por Encarsia protransvena Viggiani, Encarsia grupo strenua (Hymenoptera: Aphelinidae y Neopomphale sp. (Hymenoptera: Eulophidae. El rendimiento de frutos fue mayor en el tratamiento convencional. Los resultados muestran la necesidad de controlar la plaga con productos menos nocivos para la fauna benéfica.

  17. ESPACIOS DE SOCIABILIDAD, REDES SOCIALES DE LA RENOVACIÓN CATÓLICA Y MILITANCIA CONTESTARIA EN BAHÍA BLANCA (ARGENTINA ENTRE 1968 Y 1975

    Directory of Open Access Journals (Sweden)

    Virginia Dominella

    2015-12-01

    Full Text Available El artículo reconstruye las relaciones entre personas y grupos del catolicismo liberacionista en Bahía Blanca (Argentina, entre 1968 y 1975. Describe los espacios de sociabilidad ligados a la renovación eclesial, así como las redes sociales que estos articularon. Analiza los modos en que esos vínculos actuaron en la generación de iniciativas comunes y en la participación de los actores en diversos ámbitos de acción social y política con el fin de aportar a la transformación de la sociedad en un contexto histórico marcado por la efervescencia social y política. Para este abordaje, se ha optado por una metodología cualitativa y, en este sentido, por la utilización de diversas estrategias, desde entrevistas en profundidad hasta el análisis de distintas fuentes empíricas (que incluyen testimonios éditos, prensa, informes de inteligencia y volantes, apelando a estrategias de triangulación para lograr una comprensión en profundidad del problema en cuestión.

  18. Responsabilidad Social Matriz de indicadores sustentables que refleja el impacto de la forestación en tierras marginales del Partido de Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    Regina del Carmen Durán Durán

    2009-01-01

    Full Text Available Actualmente, se han empezado a considerar otras obligaciones que tienen las empresas para con su comunidad; se trata de aspectos vinculados con las dimensiones sociales y ambientales. Desde este contexto, nuestro trabajo tiene como punto de partida el concepto de responsabilidad social desde la noción de sustentabilidad. El objetivo es evaluar la forestación como instrumento para mejorar la sostenibilidad de los sistemas productivos tradicionales en tierras marginales del Partido de Bahía Blanca, mitigando los impactos del desarrollo no responsable de la producción primaria. Para ello, se han identificado técnicas de manejo generadoras de externalidades positivas en otras actividades agropecuarias complementarias, donde existen limitantes edafológicas, apoyándose en las tres dimensiones del concepto de sustentabilidad: ecológica, económica, sociopolítica y cultural. De igual forma, se diseñó una matriz de evaluación y ponderación de impactos, que contempla indicadores cuantitativos y cualitativos, de cuya aplicación surge la forestación como una alternativa sustentable

  19. ENCUENTROS Y DESENCUENTROS EN UN ESPACIO DE BORDE: el caso del rururbano de la ciudad de Bahía Blanca, Provincia de Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Claudia Avelina Sereno

    2016-08-01

    Because of their boundary condition, rururban areas are subject to mobile and changing phenomena. Said phenomena are caused by the pressure exerted by real estate agents, urban planning policies, and economic sectors agents such as industries or other businesses interested in these types of zones. Rururban areas are also under the influence of economic globalization, productive restructuring, and technological innovations. These last ones stablish a rupture in the, so far, predominant spatial logic by causing changes in the territories’ dynamic. The objective of this article is to analyze Bahia Blanca City’s rururban as a zone where socio-spatial conflicts are generated. Specially, conflicts related to the advance of urbanization over the city’s boundaries and also those that are a consequence of the global logic impact. The main interest is to identify and observe the ways in which residents perceive and experience these missed encounters. To do so, a qualitative methodology is used. This methodology was chosen because it takes into account the observation of the territory and the implementation of semi-structured interviews to the residents of the Bahia Blanca’s rururban. Keywords: Rururban Area; Socio-spatial Conflicts; Experience; Perception.

  20. Influencia sobre parámetros biológicos de Tagosodes orizicolus relacionados con el Virus Hoja Blanca y su permanencia en invernaderos.

    Directory of Open Access Journals (Sweden)

    Rafael Meneses

    2007-03-01

    Full Text Available Con el objetivo de determinar la influencia que ejerce el Virus Hoja Blanca (VHB sobre el insecto, se estudiaron tres colonias de T. orizicolus, procedentes de diferentes zonas arroceras de Colombia (Tolima, Costa y Jamundí En las colonias de Costa (3 años y Tolima, (9 meses, de multiplicación en condiciones semicontroladas de invernadero, no se encontró influencia negativa del virus en la longevidad de machos y hembras, y la fecundidad diaria, no ocurriendo de modo semejante en los insectos de Jamundí (4 meses que si se manifestaron efectos deletéreos en todos los parámetros antes señalados; aspecto éste muy importante en la interacción entre entomólogos, virólogos y mejoradores, en la calidad de las evaluaciones de resistencia a esta plaga y al VHB de las líneas de arroz, depende el grado de resistencia o susceptibilidad de la nuevas variedades comerciales y éste es el principal factor en el Manejo Integrado de T. orizicolus y del VHB.

  1. Características hematológicas, bioquímicas e biométricas de Piaractus mesopotamicus Holmberg, 1887 (Osteichthyes: Characidae oriundos de cultivo intensivo - DOI: 10.4025/actascibiolsci.v26i2.1647 Hematological, biochemical and biometric characteristics of Piaractus mesopotamicus Holmberg, 1887 (Osteichthyes: Characidae, reared in captivity - DOI: 10.4025/actascibiolsci.v26i2.1647

    Directory of Open Access Journals (Sweden)

    Marcos Tavares Dias

    2004-04-01

    Full Text Available O estudo das características sangüíneas pode fornecer subsídios importantes para o diagnóstico e prognóstico das condições mórbidas em populações de peixes e, contribuir para a compreensão da fisiologia comparativa, relação filogenética, condições alimentares e outros parâmetros ecológicos. Foram estudados no teleósteo Piaractus mesopotamicus o eritrograma, leucograma, trombograma, a glicemia, o cortisol, a relação hepatosomática e a relação esplenosomática. Os valores da relação hepatosomática variaram de 0,67% a 2,79%, a relação esplenosomática de 0,011% a 0,108%, número de eritrócitos de 1,870 a 4,590 x 106/µL de sangue, concentração de hemoglobina de 5,7 a 12,1g/dL, hematócrito de 24,0% a 40,0%, volume corpuscular médio de 98,0 a 174,0fL, concentração da hemoglobina corpuscular média de 19,1 a 34,2g/dL, glicose plasmática de 40,6 a 89,2mg/dL e cortisol plasmático de 4,73 a 110,5ng/dL. O número de trombócitos totais variou de 12160,0 a 89280,0/µL de sangue e leucócitos de 2019,0 a 47473,0/µl de sangue. Na contagem diferencial de leucócitos foram observados 54,1% de linfócitos; 10,9% de neutrófilos; 10,3% de monócitos; 9,9% de leucócitos granulares PAS-positivos (LG-PAS; 6,7% de eosinófilos; 0,3% de basófilos e 7,8% de leucócitos imaturos. Variações intraespecíficas foram observadas em todas as características estudadas, podendo ser consideradas como normais, no que tange aos peixes. Não se deve esperar, portanto, que as características biológicas em peixes apresentem- se distribuídas normalmenteHematological characteristics are important tools for diagnosis and prognostic features in fish population and they contribute to the comprehension of comparative physiology, phylogenetic relation, food habit and other ecological parameters. Red blood cell count (RBC, white blood cell count (WBC, thrombocytes counts, glucose, cortisol, hepatosomatic and splenosomatic relation were

  2. Insights from analyzing and modelling cascading multi-lake outburst flood events in the Santa Cruz Valley (Cordillera Blanca, Perú)

    Science.gov (United States)

    Emmer, Adam; Mergili, Martin; Juřicová, Anna; Cochachin, Alejo; Huggel, Christian

    2016-04-01

    Since the end of Little Ice Age, the Cordillera Blanca of Perú has experienced tens of lake outburst floods (LOFs), resulting in the loss of thousands of lives and significant material damages. Most commonly involving glacial lakes, such events are often directly or indirectly related to glacier retreat. Here we analyze an event on 8th February 2012 involving four lakes and affecting two valleys (Santa Cruz and Artizón) in the northern part of the Cordillera Blanca. Using the combination of field data, satellite images, digital elevation model (DEM) and GIS-based modelling approaches, the main objectives are: (i) to better understand complex multi-lake outburst flood and related foregoing and induced geomorphological processes; and (ii) to evaluate and discuss the suitability, potentials and limitations of the r.avaflow model for modelling such complex process chains. Analyzing field geomorphological evidence and remotely-sensed images, we reconstruct the event as follows: a landslide from the recently deglaciated left lateral moraine of Lake Artizón Alto (4 639 m a.s.l.), characterized by steep slopes and a height of more than 200 m produced a displacement wave which overtopped the bedrock dam of the lake. The resulting flood wave breached the dam of the downstream moraine-/landslide-dammed Lake Artizón Bajo (4 477 m a.s.l.), decreasing the lake level by 10 m and releasing 3 x 105 m3 of water. Significant amounts of material were eroded from the steeper parts of the Artizón Valley (mean slope >15°) and deposited further downstream in the flatter part of the Santa Cruz Valley (mean slope confluence of the two valleys at 3 985 m a.s.l.). The flood affected two debris cone-dammed lakes (Jatuncocha and Ichiccocha) in the Santa Cruz Valley. Some minor damages to the dam of Lake Jatuncocha were documented. Geomprohological evidence of the event was observed more than 20 km downstream from Lake Artizón Alto. The described multi-LOF event was employed as a

  3. Tècniques de maneig cultural, desinfecció de les soques i solarització per reduir les marres o falles de plantació en carxofa cv blanca de Tudela al Baix Llobregat

    OpenAIRE

    Camí, Borja

    2012-01-01

    El rendiment de la carxofa cv blanca de Tudela a la zona del Parc Agrari del Baix L lobregat a vegades es veu limitat per les marres o falles de plantació, que poden arribar a suposar un 20 % de les soques plantades, i per un retard en el creixement i manca de vigor d'alguns camps de primer any de cultiu, però sobretot de segon i tercer anys. En última instància hi intervenen dos factors: la brotada irregular i l'estrès causat per fongs patògens dels vasos vasculars i de l'arrel. Durant tr...

  4. Aprovechamiento de escorias blancas (LFS) y negras (EAFS) de acería eléctrica en la estabilización de suelos y en capas de firmes de caminos rurales

    OpenAIRE

    Ortega López, Vanesa

    2011-01-01

    El trabajo que recoge la presente Tesis Doctoral estudia la idoneidad de un aprovechamiento integral de las escorias blancas de horno de cuchara (LFS) y de las escorias negras de horno eléctrico de arco (EAFS) en la estabilización de suelos arcillosos de mala calidad y en la formación de las capas del firme de caminos rurales. Para conseguir las propiedades resistentes adecuadas en terrenos naturales arcillosos sobre los que se construyen obras civiles, es preciso mezclarlos con materiale...

  5. Aislamiento e identificación de hongos asociados a esclerocios de Sclerotium cepivorum, causante de la pudrición blanca de la cebolla, en la zona alta de Cartago, Costa Rica

    OpenAIRE

    María del Milagro Granados; Amy Wang

    2005-01-01

    Se aislaron e identificaron hongos asociados a esclerocios de Sclerotium cepivorum, causante de la pudrición blanca de la cebolla, con el fin de determinar la existencia de hongos con potencial antagónico nativos en la zona alta de Cartago. Se estudiaron 10 fincas durante febrero-mayo de 2002. Cada una se dividió en 3 áreas de acuerdo al nivel de incidencia histórica de la enfermedad (bajo, intermedio, alto). En cada área se realizó un trampeo de hongos mediante ...

  6. Análisis comparativo y valoración del impacto de las medidas gubernamentales 2009 en salvaguardias, aranceles y cupos a las importaciones de línea blanca y café en el Ecuador

    OpenAIRE

    Carpio Cordero, Ximena; Orellana Rodas, Johanna

    2010-01-01

    El presente trabajo muestra los resultados e impacto real que se dio en el Ecuador en año 2009 luego de la implementación de las medidas gubernamentales en salvaguardias, aranceles y cupos a la importación de Línea Blanca y Línea Café. Para ello se vio en primer lugar la necesidad de realizar un estudio sobre el comportamiento y evolución de las importaciones totales del Ecuador desde el año 2004 hasta el año 2008, con el fin de identificar sus principales socios comerciales, los principales ...

  7. Diferencias en las cotizaciones de los principales commodities agrícolas embarcados en los Puertos Quequén y Bahía Blanca entre 1994-2007

    OpenAIRE

    Terwissen, Ana Patricia

    2008-01-01

    En los últimos años en la región sudeste de la provincia de Buenos Aires se percibe una creciente preocupación tanto de actores públicos como privados por las diferencias que registran los precios de pizarra de los principales commodities agrícolas embarcados por el Puerto de Quequén en relación al puerto de Bahía Blanca. Dada la importancia económica que tiene la actividad granaria para esta región, este trabajo se propone como objetivo analizar y explorar los factores explicativos que gener...

  8. Estudio del comportamiento de los recargues multicapas de depósitos soldados de fundición blanca al cromo

    Directory of Open Access Journals (Sweden)

    R. Collazo-Carceller

    2009-05-01

    Full Text Available Se determina la influencia de los parámetros Energía introducida (Hi, Número de capas (Nc y Ancho del depósito (Ad, en la morfología y el incremento de la resistencia al desgaste abrasivo de capas depositadas sobre acero 1020 utilizando el electrodo de fundición blanca al cromo UTP Ledurit – 61. Empleando la microscopia óptica se identificaron y cuantificaron las fases presentes, analizando su efecto en el desgaste. Siendo determinante la influencia de la inclinación de las dendritas y su posición con respecto a 90° en el incremento de la resistencia al desgaste abrasivo. Se caracterizaron los posibles mecanismos de daño superficial provocado por desgaste abrasivo empleando la microscopia electrónica de barrido. Se propusieron modelos lineales para correlacionar la influencia de la cantidad, tamaño, dispersión de los carburos y el ángulo de inclinación de las dendritas, en el incremento de la resistencia al desgaste.The influence of different parameters in layer morphology and abrasion resistance of Fe-Cr-C electrodes UTP Ledurit – 61 on steel 1020 was studied. Introduced Energy (Hi, Number of Layers (Nc, and Deposit Width (Ad were the main parameters considered. The metallographic identification and quantification of metal phases and the determination of their effect in abrasion resistance were made with optical microscopy. The abrasive wear test characterized by scanning electron microscopy, defines a possible mechanism of surface damage. It was found that the angle formed between a normal line to the surface and the dendrite inclination is directly related with the increment of wear resistance. Lineal models that correlate wear resistance with quantity, size, and carbide dispersion and dendrite angle inclination were also developed.

  9. Desarrollo en armonía ambiental: El caso de la Vereda Peñas Blancas del municipio de Arcabuco, Boyacá.

    Directory of Open Access Journals (Sweden)

    Ricardo Gómez

    2010-10-01

    Full Text Available Con el propósito de generar un conocimiento aproximado (holístico a la realidad, de un territorio claramente definible, por constituirse en un ecosistema estratégico dentro del conjunto andino; se eligió profundizar en sus condiciones biofísicas, ambientales y antrópicas bajo una mirada construida a través de diálogo de saberes de disciplinas de conjunto y orgánicas. Además, para una valoración metodológica conjunta, y así prospectar un escenario de futuro. El proyecto de investigación busca garantizar su sostenibilidad y evolución en un orden consecuente con la permanencia de la vida diversa, donde el hombre se conforme con ser interventor positivo de la naturaleza y a estar encadenado a la vida como una sola (Odum, 1972. Este artículo ayuda a identificar la problemática y las potencialidades del conjunto, en la relación naturaleza-cultura (Gómez:2009, lo que corresponde sólo a la fase diagnostica y parte de la propuesta metodológica. El fin es propiciar la concreción de acciones en proyectos que sirvan para mejorar las condiciones de vida de los habitantes, con un uso racional del entorno. El artículo presenta resultados preliminares de un primer acercamiento con trabajo de campo, del proyecto piloto titulado “Diagnostico sobre prácticas histórico-sociales y culturales, tecnológicas agropecuarias y participación de la mujer en la Vereda de Peñas Blancas del municipio de Arcabuco. Boyacá”.

  10. Dieta y disponibilidad de forraje del venado cola blanca Odocoileus virginianus thomasi (Artiodactyla: Cervidae en un campo experimental de Campeche, México

    Directory of Open Access Journals (Sweden)

    Danilo Granados

    2014-08-01

    Full Text Available En Campeche, México no existen estudios de la dieta de Odocoileus virginianus thomasi; a pesar de la existencia de 122 Unidades de Manejo para la Conservación de la Vida Silvestre (UMAS en donde se realiza aprovechamiento del venado cola blanca. Los objetivos del trabajo fueron conocer la composición botánica de la dieta y su cambio estacional, la disponibilidad de forraje, la capacidad de carga y carga animal de O. virginianus thomasi. El trabajo se realizó de octubre 2010 a mayo 2012 en el Campo Experimental del Colegio de Postgraduados en Campeche, México. La composición de la dieta se determinó mediante el análisis de heces de venado y material de referencia con la técnica microhistológica; la disponibilidad de forraje se estimó con el método de Adelaide; la capacidad de carga utilizando la presión de pastoreo y la carga animal considerando el forraje disponible y 35% de eficiencia de utilización. La dieta incluyó 40 especies de 15 familias. La riqueza de especies más alta fue de 29 especies en la época de lluvia; las arbustivas fueron preferidas en las tres épocas del año y las herbáceas en la época de lluvia. La composición de la dieta, disponibilidad de forraje, la capacidad de carga y carga animal variaron a través del año. La capacidad de carga fluctuó entre 0.04 a 1.08 venados/ha.

  11. Modeling non-steady state radioisotope transport in the vadose zone--A case study using uranium isotopes at Pena Blanca, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Ku, T. L.; Luo, S.; Goldstein, S. J.; Murrell, M. T.; Chu, W. L.; Dobson, P. F.

    2009-06-01

    Current models using U- and Th-series disequilibria to study radioisotope transport in groundwater systems mostly consider a steady-state situation. These models have limited applicability to the vadose zone (UZ) where the concentration and migratory behavior of radioisotopes in fluid are often transitory. We present here, as a first attempt of its kind, a model simulating the non-steady state, intermittent fluid transport in vadose layers. It provides quantitative constraints on in-situ migration of dissolved and colloidal radioisotopes in terms of retardation factor and rock-water interaction (or water transit) time. For uranium, the simulation predicts that intermittent flushing in the UZ leads to a linear relationship between reciprocal U concentration and {sup 234}U/{sup 238}U ratio in percolating waters, with the intercept and slope bearing information on the rates of dissolution and {alpha}-recoil of U isotopes, respectively. The general validity of the model appears to be borne out by the measurement of uranium isotopes in UZ waters collected at various times over a period during 1995-2006 from a site in the Pena Blanca mining district, Mexico, where the Nopal I uranium deposit is located. Enhanced {sup 234}U/{sup 238}U ratios in vadose-zone waters resulting from lengthened non-flushing time as prescribed by the model provide an interpretative basis for using {sup 234}U/{sup 238}U in cave calcites to reconstruct the regional changes in hydrology and climate. We also provide a theoretical account of the model's potential applications using radium isotopes.

  12. Modeling non-steady state radioisotope transport in the vadose zone - A case study using uranium isotopes at Peña Blanca, Mexico

    Science.gov (United States)

    Ku, T. L.; Luo, S.; Goldstein, S. J.; Murrell, M. T.; Chu, W. L.; Dobson, P. F.

    2009-10-01

    Current models using U- and Th-series disequilibria to study radioisotope transport in groundwater systems mostly consider a steady-state situation. These models have limited applicability to the vadose zone (UZ) where the concentration and migratory behavior of radioisotopes in fluid are often transitory. We present here, as a first attempt of its kind, a model simulating the non-steady state, intermittent fluid transport in vadose layers. It provides quantitative constraints on in-situ migration of dissolved and colloidal radioisotopes in terms of retardation factor and rock-water interaction (or water transit) time. For uranium, the simulation predicts that intermittent flushing in the UZ leads to a linear relationship between reciprocal U concentration and 234U/ 238U ratio in percolating waters, with the intercept and slope bearing information on the rates of dissolution and α-recoil of U isotopes, respectively. The general validity of the model appears to be borne out by the measurement of uranium isotopes in UZ waters collected at various times over a period during 1995-2006 from a site in the Peña Blanca mining district, Mexico, where the Nopal I uranium deposit is located. Enhanced 234U/ 238U ratios in vadose-zone waters resulting from lengthened non-flushing time as prescribed by the model provide an interpretative basis for using 234U/ 238U in cave calcites to reconstruct the regional changes in hydrology and climate. We also provide a theoretical account of the model's potential applications using radium isotopes.

  13. Hábitos alimentarios del venado cola blanca Odocoileus virginianus (Artiodactyla: Cervidae en el Parque Natural Sierra Nanchititla, Estado de México

    Directory of Open Access Journals (Sweden)

    Ulises Aguilera-Reyes

    2013-03-01

    Full Text Available El venado cola blanca es una especie con una gran plasticidad conductual y de adaptación en diferentes hábitat. En el Parque Sierra Nanchititla en el Estado de México se realizó un estudio para determinar los hábitos alimentarios en el bosque mesófilo de montaña (BMM y bosque de pino-encino (BPE. De junio 1990 a mayo 1992 se recolectaron 104 muestras de excremento de venado en las dos zonas de estudio. Aplicamos el índice de Morisita y la correlación de Spearman para determinar la preferencia alimentaria. Se utilizó el análisis histológico de heces fecales para herbívoros las cuales se compararon con muestras de tejidos vegetales de plantas de la zona de estudio. Los resultados muestran que consume el 79.44% de especies vegetales del BMM y 20.56% del BPE. Existe cierta tendencia en la selectividad de 12 de las 14 especies de plantas localizadas en el BMM, mientras que para el BPE no se aprecia tal tendencia. Las especies clave que for- man parte de la alimentación elemental del venado fueron: Acalypha setosa, Smilax pringlei, Psidium sartorianum y Dendropanax arborea. El consumo de plantas no varió sig- nificativamente entre la época seca y lluviosa en función de la forma biológica (X2=12, p=0.21. Sin embargo, durante la época seca existe cierta tendencia a consumir árboles y a finales de la época de lluvia a consumir hierbas (Z=1.61, p=0.95. Los datos indican que el venado puede ser selecti- vo con plantas del BMM, mientras que para el BPE tiende a ser oportunista.

  14. Aterações químicas e microbiológicas em PACU (piaractus mesopotamicus armazenado sob refrigeração a 5°c

    Directory of Open Access Journals (Sweden)

    Mauro F.F. Leitão

    1997-08-01

    Full Text Available A pesquisa foi conduzida com o objetivo de analisar a vida útil e o processo de deterioração do pacu (Piaractus mesopotanicus armazenado sob refrigeração em temperatura inadequada (5°C. Amostras do pescado, imediatamente após a captura, foram armazenadas a 5°C e analisadas nos intervalos de 0-7-14 e 21 dias, com relação a características sensoriais e de natureza química (bases nitrogenadas voláteis - BNV, nitrogênio não protéico - NNP, aminoácidos livres totais, histidina livre e histamina e microbiológicos (contagem padrão, produtores de histamina em ágar Niven, contagem de microrganismos gelatinase e H2S positivos, nas temperaturas de 35°C, 20° e 5°C. Os resultados obtidos confirmaram que, a exemplo de outros peixes fluviais de regiões tropicais, o pacu revelou-se bastante resistente ao armazenamento, somente evidenciando uma alteração marcante após 14 dias de estocagem. Assim mesmo, a rejeição do pescado foi baseada principalmente em características sensoriais (odor, aspecto, textura uma vez que com relação aos índices químicos (BNV e mesmo microbiológicos, não se caracterizava uma situação definitiva de deterioração e rejeição. Observou-se, também, que o processo de deterioração pareceu concentrar-se principalmente no muco superficial, sendo que as características químicas do tecido muscular não evidenciaram alterações marcantes, mesmo após 21 dias de armazenamento. A presença de histamina não foi positivada nas amostras e os níveis de histidina livre, embora relativamente elevadas, não sugerem maiores riscos desta espécie de peixe como eventual veículo de intoxicação por histamina. No entanto, bactérias his+ foram isoladas das amostras iniciais, entre elas cepas de Plesiomonas shigelloides e Vibrio fluvialis. A microbiota contaminante natural foi reduzida, predominando microrganismos mesófilos/psicrotrófilos, com baixas contagens iniciais a 5°C. Ao longo do armazenamento a 5

  15. Comunidades Halófilas de la costa de la Bahía Blanca (Argentina: Caracterización, mapeo y cambios durante los últimos cincuenta años Halophytic communities of the coast of Bahía Blanca (Argentina: characterization, mapping and changes in the last fifty years

    Directory of Open Access Journals (Sweden)

    Ana Julia Nebbia

    Full Text Available Realizamos una clasificación y mapeo de las unidades de vegetación presentes en la franja costera de Bahía Blanca (Argentina, donde identificamos ocho tipos de ambientes naturales: cangrejales, charcos temporarios, zonas intermareales ocupadas por marismas de Sarcocornia perennis o espartillares de Spartina alterniflora , arbustales bajos de Allenrolfea patagonica , arbustales bajos de Atriplex undulata, arbustales altos de Cyclolepis genistoides y pastizales. Comparamos los valores obtenidos a partir de nuestros censos florísticos con datos provenientes de estudios fitosociológicos desarrollados en el área entre 1949 y 1950. Observamos que la composición y estructura de las comunidades se mantuvo relativamente constante, excepto en el caso del porcentaje de especies exóticas, donde se observa que los valores actuales son superiores en el caso de los tres ambientes de arbustal, lo que podría deberse a efectos de actividades humanas. Como conclusión se propone que, si bien este ambiente se encuentra en relativo buen estado de conservación, comparado con otros de la región, muestra signos de deterioro que justifican la adopción de medidas de conservación.We classified and mapped vegetation units along the coast of Bahía Blanca (Argentina, where we discriminated eight habitat types: intertidal flats without vegetation and with high density of crab burrows ( cangrejales , temporary ponds and puddles, intertidal steppes occupied by stands of Sarcocornia perennis or by Spartina alterniflora marshes, low Allenfolfea patagonica shrubs, low Atriplex undulata shrubs, high Cyclolepis genistoides shrubs and halophytic grasslands with Distichlis spicata . We compared our results with those from a phytosociological survey conducted in the area in 1949 and 1950. We observed a relative constancy in the composition and structure of plant communities, except for the percentage of exotic species being greater than historical ones for the three

  16. Impact of a power plant cooling system on copepod and meroplankton survival (Bahía Blanca estuary, Argentina Impacto del sistema de enfriamiento de una central termoeléctrica sobre la supervivencia de copépodos y meroplancton (estuario de Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    Mónica Susana Hoffmeyer

    2005-09-01

    Full Text Available The impact of a power plant cooling system in the Bahía Blanca estuary (Argentina on the survival of target zooplanktonic organisms (copepods and crustacean larvae and on overall mesozooplankton abundance was evaluated over time. Mortality rates were calculated for juveniles and adults of four key species in the estuary: Acartia tonsa Dana, 1849 and Eurytemora americana Williams, 1906 (native and invading copepods, and larvae of the crab Chasmagnathus granulata Dana, 1851 and the invading cirriped Balanus glandula Darwin, 1854. Mean total mortality values were up to four times higher at the water discharge site than at intake, though for all four species, significant differences were only registered in post-capture mortality. The findings show no evidence of greater larval sensitivity. As expected, the sharpest decrease in overall mesozooplankton abundance was found in areas close to heated water discharge.El impacto del sistema de enfriamiento de una planta termoeléctrica ubicada en el estuario de Bahía Blanca, Argentina, fue evaluado en el tiempo, sobre la supervivencia de especies zooplanctónicas seleccionadas (copépodos y larvas de crustáceos y la abundancia general del meso-zooplancton. Se calcularon tasas de mortalidad de juveniles y adultos de cuatro especies clave en el estuario: Acartia tonsa Dana,1849 y Eurytemora americana Williams,1906 (copépodos nativo e invasor, y larvas del cangrejo Chasmagnathus granulata Dana, 1851 y del cirripedio invasor Balanus glandula Darwin, 1854. Los valores medios hallados de la tasa de mortalidad total, fueron hasta cuatro veces más altos en la descarga que en el agua de entrada al sistema. Sin embargo sólo se registraron diferencias significativas entre estos dos sitios, en los valores de mortalidad post-captura obtenidos para las cuatro especies. Los resultados del estudio no demostraron una mayor sensibilidad larval. Como se esperaba, la disminución más pronunciada en la abundancia general

  17. Queratitis por Acanthamoeba sp.: primer caso confirmado por aislamiento y tipificación molecular en Bahía Blanca, provincia de Buenos Aires, Argentina Acanthamoeba sp. keratitis: first case confirmed by isolation and molecular typification in Bahía Blanca, Buenos Aires Province, Argentina

    Directory of Open Access Journals (Sweden)

    M. L. Gertiser

    2010-06-01

    Full Text Available Algunas especies del género Acanthamoeba provocan queratitis amebiana (QA, una infección de la córnea muy dolorosa, generalmente unilateral, con compromiso importante de la visión. Se presenta el caso de una mujer de 31 años usuaria de lentes de contacto con hábitos inadecuados de higiene y conservación de las lentes. La paciente consultó por enrojecimiento y dolor intenso en el ojo derecho, de dos meses de evolución. Luego del examen oftalmológico y ante la sospecha de una etiología parasitaria se realizó una biopsia de la zona lesionada, que se destinó al análisis bacteriológico y parasitológico en el laboratorio. También se remitieron los líquidos de lavado y el estuche de las lentes. No se detectó crecimiento bacteriano en las muestras. Los cultivos para la búsqueda de Acanthamoeba resultaron positivos en todos los especímenes analizados. Las amebas aisladas fueron clasificadas morfológica y molecularmente como pertenecientes al género Acanthamoeba. El presente trabajo muestra el primer caso de queratitis por Acanthamoeba de la ciudad de Bahía Blanca identificado por el laboratorio mediante procedimientos de alto valor diagnóstico.Some species of the Acanthamoeba genus cause keratitis, a very painful, most likely unilateral corneal infection , associated with eye and vision impairment. We here present a case of a 31-year-old female patient, a regular user of soft contact lenses without good practices of lens hygiene and handling. The patient attended medical consultation after two months of inflammation and pain in her right eye. After ophthalmological studies, and due to suspicion of a parasitic infection, a biopsy was performed and the sample submitted for bacteriological and parasitological analyses. Moreover, contact lens holders and lens cleaning solutions were studied. The samples yielded negative results for bacterial infection. However, cultivation of all samples showed the presence of amoeboid parasites

  18. Ganho de peso e taxa de sobrevivência de pós-larvas de pacu (Piaractus mesopotamicus alimentadas com rações contendo diferentes níveis de vitamina C - DOI: 10.4025/actascianimsci.v25i1.2070 Growth performance and survival of pacu (Piaractus mesopotamicus fed diets containing different levels of vitamin C - DOI: 10.4025/actascianimsci.v25i1.2070

    Directory of Open Access Journals (Sweden)

    Margarida Maria Barros

    2003-04-01

    Full Text Available Avaliaram-se o ganho de peso e a taxa de sobrevivência de pós-larvas de pacu alimentadas com quatro rações contendo diferentes níveis de vitamina C. As rações isoprotéicas (40,00% PB e isoenergéticas (4000kcal ED/kg da ração foram compostas por 41,89% de albumina, 2,00% de gelatina, 31,42% de amido de milho, 5,00% de farinha de peixe, 12,85% de óleo de soja, 5,32% de fosfato bicálcico, 1,00% de suplemento vitamínico e mineral, 0,02% de antioxidante e 0,50% de alginato; receberam 125, 250, 500 e 750mg de vitamina C (2-monofosfato de ácido ascórbico L por kg da ração. Foram utilizadas 180 pós-larvas de pacu (Piaractus mesopotamicus com peso inicial médio de 13,20±7,70mg, distribuídas em 12 aquários de polietileno de 12 L, dotados de fluxo contínuo de ar e temperatura monitorada por termostato central. O estudo teve duração de 15 dias e o delineamento experimental foi o inteiramente casualizado, com quatro tratamentos e três repetições. Os resultados de ganho de peso (mg e taxa de sobrevivência (% para a inclusão de 125, 250, 500 e 750mg de vitamina C/kg da ração foram, respectivamente, de 19,00cmg e 83,30b%; 25,00amg e 95,55a%; 20,00bcmg e 84,44b%; 21,00bmg e 91,10ab%. Concluiu-se que a suplementação de 250mg de vitamina C/kg de ração apresenta-se como a mais eficiente para a fase pós-larval de pacu.Growth performance and survival of pacu larvae fed diets containing different levels of vitamin C were evaluated for 15 days. The experimental diets were formulated to contain approximately 40.00% crude protein and 4000kcal of digestible energy/kg diet based on the feedstuffs values reported by NRC (1993 and 4 levels of ascorbic acid, 125, 250, 500 and 750mg/kg diet. Pacu larvae with 0.0132 ± 0.0077g were stocked into 12 aquaria (12-L at 15 larvae/aquarium. The results of this study indicate that weight gain and survival percentage were significantly higher for fish fed diets supplemented with 250mg of vitamin C/kg.

  19. LA COMPRENSIÓN DEL TERRITORIO A PARTIR DEL MODELO DE FORMACIÓN SOCIO ESPACIAL DESDE LA PRÁCTICA DE LA HORTICULTURA EN EL PERIURBANO DE BAHÍA BLANCA, ARGENTINA

    Directory of Open Access Journals (Sweden)

    María Amalia Lorda

    2016-03-01

    Full Text Available El desarrollo de la actividad hortícola en las ciudades argentinas se construye en un entramado que se remonta a la fundación misma de cada lugar, como una actividad propia de quienes buscan originar su propio sustento. Con el crecimiento de las ciudades, el territorio cambia, nuevos usos se observan, así como la llegada de otras personas -inmigrantes- que sin duda impregnan de especificidades a un nuevo territorio en construcción. En el periurbano de Bahía Blanca, la horticultura se nutre de distintas oleadas de inmigrantes, quienes plasman en el territorio saberes y prácticas singulares. El aporte de la geografía social francesa es de gran valor para la comprensión de las distintas lógicas socio-espaciales que suceden. El modelo de formación socio espacial que se aplica permite comprender el territorio, a partir de observaciones en el terreno y entrevistas a los actores que territorializan con sus prácticas un modo de pensar el territorio. Palabras clave: Periurbano; Territorio; Formación Socio-espacial; Actividad Hortícola.   THE COMPREHENSION OF THE TERRITORY FROM THE MODEL OF FORMATION SPATIAL PARTNER FROM THE PRACTICE OF THE HORTICULTURE THE PERIURBANO OF BAHÍA BLANCA, ARGENTINA ABSTRACT The development of horticulture in the Argentine cities is built on a framework that goes back to the very foundation of every place, as an activity of those who seek to lead their own livelihood. With the growth of cities, the territory changes, new uses are observed, and the arrival of others -inmigrantes- undoubtedly imbued with specificities into new territory under construction. In the periurban horticulture Bahia Blanca, is nourished by different waves of immigrants, who reflected on the territory unique knowledge and practices. The contribution of the French social geography is of great value for the understanding of different socio-spatial logics that happen. The model of socio spatial information that applies to understanding the

  20. Genetic identification of F1 and post-F1 serrasalmid juvenile hybrids in Brazilian aquaculture.

    Directory of Open Access Journals (Sweden)

    Diogo Teruo Hashimoto

    Full Text Available Juvenile fish trade monitoring is an important task on Brazilian fish farms. However, the identification of juvenile fish through morphological analysis is not feasible, particularly between interspecific hybrids and pure species individuals, making the monitoring of these individuals difficult. Hybrids can be erroneously identified as pure species in breeding facilities, which might reduce production on farms and negatively affect native populations due to escapes or stocking practices. In the present study, we used a multi-approach analysis (molecular and cytogenetic markers to identify juveniles of three serrasalmid species (Colossoma macropomum, Piaractus mesopotamicus and Piaractus brachypomus and their hybrids in different stocks purchased from three seed producers in Brazil. The main findings of this study were the detection of intergenus backcrossing between the hybrid ♀ patinga (P. mesopotamicus×P. brachypomus×♂ C. macropomum and the occurrence of one hybrid triploid individual. This atypical specimen might result from automixis, a mechanism that produces unreduced gametes in some organisms. Moreover, molecular identification indicated that hybrid individuals are traded as pure species or other types of interspecific hybrids, particularly post-F1 individuals. These results show that serrasalmid fish genomes exhibit high genetic heterogeneity, and multi-approach methods and regulators could improve the surveillance of the production and trade of fish species and their hybrids, thereby facilitating the sustainable development of fish farming.

  1. Genetic identification of F1 and post-F1 serrasalmid juvenile hybrids in Brazilian aquaculture.

    Science.gov (United States)

    Hashimoto, Diogo Teruo; Senhorini, José Augusto; Foresti, Fausto; Martínez, Paulino; Porto-Foresti, Fábio

    2014-01-01

    Juvenile fish trade monitoring is an important task on Brazilian fish farms. However, the identification of juvenile fish through morphological analysis is not feasible, particularly between interspecific hybrids and pure species individuals, making the monitoring of these individuals difficult. Hybrids can be erroneously identified as pure species in breeding facilities, which might reduce production on farms and negatively affect native populations due to escapes or stocking practices. In the present study, we used a multi-approach analysis (molecular and cytogenetic markers) to identify juveniles of three serrasalmid species (Colossoma macropomum, Piaractus mesopotamicus and Piaractus brachypomus) and their hybrids in different stocks purchased from three seed producers in Brazil. The main findings of this study were the detection of intergenus backcrossing between the hybrid ♀ patinga (P. mesopotamicus×P. brachypomus)×♂ C. macropomum and the occurrence of one hybrid triploid individual. This atypical specimen might result from automixis, a mechanism that produces unreduced gametes in some organisms. Moreover, molecular identification indicated that hybrid individuals are traded as pure species or other types of interspecific hybrids, particularly post-F1 individuals. These results show that serrasalmid fish genomes exhibit high genetic heterogeneity, and multi-approach methods and regulators could improve the surveillance of the production and trade of fish species and their hybrids, thereby facilitating the sustainable development of fish farming.

  2. El agricultor de la mano con la información: experiencias y percepciones en la cultura de las necesidades de información de los agricultores participantes del proyecto Servicio de Información Agrícola de Tierra Blanca

    OpenAIRE

    Muñoz Alvarado, Ma. Daniela

    2015-01-01

    Investigación teórica de índole cualitativa sobre la vivencia y experiencias de un grupo de agricultores de Tierra Blanca (Costa Rica), en torno a las necesidades de información en su ambiente agricultor.

  3. Efecto de clausuras de ganado en la recuperación de la vegetación en el Parque Nacional Laguna Blanca

    Directory of Open Access Journals (Sweden)

    Luciana Inés Escobar

    2013-06-01

    Full Text Available El objetivo de este estudio fue analizar los efectos de la exclusión de ganado sobre la vegetación de tres ambientes del Parque Nacional Laguna Blanca (PNLB: un sector de estepa graminoso-arbustiva, un borde de laguna y un área de mallín. En ellos se comparó la composición florística, la riqueza y cobertura de especies dentro y fuera de las clausuras. Se evaluó el nivel de herbivoría mediante una escala semi-cuantitativa, y se midió el grado de compactación del suelo utilizando un penetrómetro de golpes. Las 276 especies presentes en el Parque corresponden a 56 familias (destacándose Asteraceae, Poaceae y Fabaceae y representan dos grandes grupos funcionales: herbáceas (73,6% y leñosas (26,3%. El 15% del total son exóticas, y su presencia se relaciona con el uso pastoril de las tierras. La diversidad en la composición vegetal del Parque es alta debido a la variedad de ambientes que allí existen, donde contrariamente a la cobertura, la riqueza de especies fue mayor en el sector estepario y menor en el mallín. La tendencia general es la de mayor riqueza y cobertura en el interior de las clausuras. El mayor impacto de herbivoría es producido por ganado ovino y caprino, debido a su amplia y versátil dieta como a la preferencia por el consumo de especies palatables, aunque la compactación del suelo fue significativa afuera de la clausura del sector estepario.Los resultados obtenidos mostraron la exitosa recuperación de la cobertura vegetal dentro de las clausuras contra ganado, poniendo de manifiesto la capacidad productiva de este ecosistema. Esto sugiere que un mediante riguroso control de la carga animal, aún existe una buena probabilidad de regeneración de las condiciones naturales características de este medio ambiente. 

  4. REVISIÓN: DEGRADACIÓN DE PLAGUICIDAS MEDIANTE HONGOS DE LA PUDRICIÓN BLANCA DE LA MADERA PESTICIDES DEGRADATION BY WHITE ROT FUNGI: A REVIEW

    Directory of Open Access Journals (Sweden)

    Juan Carlos Quintero Díaz

    2011-06-01

    Full Text Available Los hongos de la pudrición blanca de la madera, se han caracterizado por su capacidad para degradar y mineralizar la lignina empleando un sistema enzimático extracelular compuesto principalmente de tres enzimas Ligninoperoxidasa (LiP, Manganeso peroxidasa (MnP y Lacasa. Durante los últimos veinte años se ha orientado la atención a estos hongos y su sistema enzimático ligninolítico para estudiar la capacidad para degradar un amplio rango de compuestos xenobióticos como plaguicidas, colorantes, explosivos, etc. Sin embargo, se ha observado que gran número de compuestos entre ellos los plaguicidas no responden al proceso degradativo de las enzimas ligninoliticas y esto ha permitido descubrir recientemente nuevos mecanismos empleados por estos hongos como son los sistemas oxidativos de las monooxigenasas del citocromo P-450 y reductivo de las transferasas, ya ampliamente conocidos en animales superiores e identificados como fase I y fase II del metabolismo. En esta revisión se describen estos tres tipos de mecanismos degradativos hasta ahora conocidos que son empleados por los hongos para la degradación de contaminantes ambientales y se analizan algunos casos de plaguicidas donde se involucran estos mecanismos en su degradación.Wood white rot fungi are characterized by their capacity of degradation and mineralization of lignin by means of an enzymatic extracellular system, which mainly consists of lignin peroxidase (LiP, Manganese peroxidase (MnP and Laccase. During the last twenty years, these fungi and their enzymatic ligninolytic system have been the focus of attention to study the degradation capacity of a wide range of xenobiotics as pesticides, dyes, explosives, etc. However, a large number of xenobiotics are not responding to ligninolytic enzymes biodegradation process. This situation has permitted the discovering of new mechanisms used by fungi as citochrome P-450 monooxygenases oxidation system, and transferases’ reductive

  5. IN-SITU RADIONUCLIDE TRANSPORT NEAR THE NOPAL I URANIUM DEPOSIT AT PENA BLANCA, MEXICO: CONSTRAINTS FROM SHORT-LIVED DECAY-SERIES RADIONUCLIDES

    Energy Technology Data Exchange (ETDEWEB)

    S. Luo; T.L. Ku; V. Todd; M. Murrell; J. Alfredo Rodriguez Pineda; J. Dinsmoor; A. Mitchell

    2005-07-11

    For nuclear waste management, an important mechanism by which radioactive waste components are isolated from returning to the human environment, the biosphere, is by the geological barrier in which the effectiveness of the barrier is characterized by in-situ retardation factor, i.e., the transport rate of a radionuclide relative to that of groundwater. As part of natural analog studies of the Yucca Mountain Project of the U. S. Department of Energy, we propose such characterization by using naturally-occurring decay-series radioisotopes as an analog. We collected large-volume (>1000 liters) groundwater samples from three wells (PB, Pozos, and PB4, respectively) near the Nopal I Uranium Ore site at Pena Blanca, Mexico, by using an in-situ Mn-cartridge filtration technique for analysis of short-lived decay-series radionuclides. Results show that the activities of short-lived radioisotopes ({sup 228}Ra, {sup 224}Ra and {sup 223}Ra) and activity ratios of {sup 224}Ra/{sup 228}Ra and {sup 224}Ra/{sup 223}Ra are higher at PB and Pozos than at PB4. In contrast, the {sup 210}Po activity is much lower at PB and Pozos than at PB4. The high Ra activities and activities ratios at PB and Pozos are attributable to the high alpha-recoil input from the aquifer rocks, while the high {sup 210}Po activity at PB4 is due to the enhanced colloidal transport. Based on a uranium-series transport model, we estimate that the in-situ retardation factor of Ra is (0.43 {+-} 0.02) x 10{sup 3} at PB, (1.68 {+-} 0.08) x 10{sup 3} at Pozos, and (1.19 {+-} 0.08) x 10{sup 3} at PB4 and that the mean fracture width in the aquifer rocks is about 0.23 {micro}m at PB, 0.37 {micro}m at Posos, and 4.0 {micro}m at PB4, respectively. The large fracture width at PB4 as derived from the model provides an additional evidence to the inference from the Po measurements that particle-reactive radionuclides are transported mainly as colloidal forms through the large fractures in rocks. Our model also suggests that

  6. Increased Concentrations of Short-Lived Decay-Series Radionuclides in Groundwaters Underneath the Nopal I Uranium Deposit at Pena Blanca, Mexico

    Science.gov (United States)

    Luo, S.; Ku, T.; Todd, V.; Murrell, M. T.; Dinsmoor, J. C.

    2007-05-01

    The Nopal I uranium ore deposit at Pena Blanca, Mexico, located at > 200 meters above the groundwater table, provides an ideal natural analog for quantifying the effectiveness of geological barrier for isolation of radioactive waste nuclides from reaching the human environments through ground water transport. To fulfill such natural analog studies, three wells (PB1, PB2, and PB3 respectively) were drilled at the site from the land surface down to the saturated groundwater zone and ground waters were collected from each of these wells through large- volume sampling/in-situ Mn-filter filtration for analyses of short-lived uranium/thorium-series radionuclides. Our measurements from PB1 show that the groundwater standing in the hole has much lower 222Rn activity than the freshly pumped groundwater. From this change in 222Rn activity, we estimate the residence time of groundwater in PB1 to be about 20 days. Our measurements also show that the activities of short-lived radioisotopes of Th (234Th), Ra (228Ra, 224Ra, 223Ra), Rn (222Rn), Pb (210Pb), and Po (210Po) in PB1, PB2, and PB3 are all significantly higher than those from the other wells near the Nopal I site. These high activities provide evidence for the enrichment of long-lived U and Ra isotopes in the groundwater as well as in the associated adsorbed phases on the fractured aquifer rocks underneath the ore deposit. Such enrichment suggests a rapid dissolution of U and Ra isotopes from the uranium ore deposit in the vadose zone and the subsequent migration to the groundwater underneath. A reactive transport model can be established to characterize the in-situ transport of radionuclides at the site. The observed change of 222Rn activity at PB1 also suggests that the measured high radioactivityies in ground waters from the site isare not an artifact of drilling operations. However, further studies are needed to assess if or to what extent the radionuclide migration is affected by the previous mining activities at

  7. Uranium-rich opal from the Nopal I uranium deposit, Peña Blanca, Mexico: Evidence for the uptake and retardation of radionuclides

    Science.gov (United States)

    Schindler, Michael; Fayek, Mostafa; Hawthorne, Frank C.

    2010-01-01

    The Nopal I uranium deposit of the Sierra Peña Blanca, Mexico, has been the focus of numerous studies because of its economic importance and its use as a natural analog for nuclear-waste disposal in volcanic tuff. Secondary uranyl minerals such as uranophane, Ca[(UO 2)(SiO 3OH)] 2(H 2O) 5, and weeksite, (K,Na) 2[(UO 2) 2(Si 5O 13)](H 2O) 3, occur in the vadose zone of the deposit and are overgrown by silica glaze. These glazes consist mainly of opal A, which contains small particles of uraninite, UO 2, and weeksite. Close to a fault between brecciated volcanic rocks and welded tuff, a greenish silica glaze coats the altered breccia. Yellow silica glazes from the center of the breccia pipe and from the high-grade pile coat uranyl-silicates, predominantly uranophane and weeksite. All silica glazes are strongly zoned with respect to U and Ca, and the distribution of these elements indicates curved features and spherical particles inside the coatings. The concentrations of U and Ca correlate in the different zones and both elements inversely correlate with the concentration of Si. Zones within the silica glazes contain U and Ca in a 1:1 ratio with maximum concentrations of 0.08 and 0.15 at.% for the greenish and yellow glazes, respectively, suggesting trapping of either Ca 1U 1-aqueous species or -particles in the colloidal silica. X-ray photoelectron spectroscopy (XPS), Fourier-transform infra-red spectroscopy (FTIR), and oxygen-isotope ratios measured by secondary-ion mass spectrometry (SIMS) indicate higher U 6+/U 4+ ratios, higher proportions of Si-OH groups and lower δ 18O values for the greenish silica glaze than for the yellow silica glaze. These differences in composition reflect increasing brecciation, porosity, and permeability from the center of the breccia pipe (yellow silica glaze) toward the fault (green silica glaze), where the seepage of meteoric water and Eh are higher.

  8. HUMEDAD CRÍTICA Y REPELENCIA AL AGUA EN ANDISOLES BAJO COBERTURA DE Cupressus lusitanica y Quercus humboldtii EN LA CUENCA DE LA QUEBRADA PIEDRAS BLANCAS (MEDELLÍN, COLOMBIA CRITICAL MOISTURE AND WATER REPELLENCY ON ANDISOLS UNDER Cupressus lusitanica AND Quercus humboldtii COVER IN THE PIEDRAS BLANCAS WATERSHED ( MEDELLÍN, COLOMBIA

    Directory of Open Access Journals (Sweden)

    Bibiana Caballero Mejía

    2007-12-01

    Full Text Available En dos vertientes de la cuenca de la quebrada Piedras Blancas (Medellín, Colombia se estudió la relación humedad - persistencia de la repelencia al agua en la parte superficial de andisoles bajo dos coberturas vegetales: Cupressus lusitanica (ciprés y Quercus humboldtii (roble, en tres posiciones a lo largo de la vertiente de colinas bajas: superior, media e inferior y en dos condiciones de humedad: con la humedad de campo y con la humedad adquirida al equilibrar al aire durante dos días muestras que habían sido secadas a 105 °C. En cada sitio de la vertiente se ubicó una parcela de 6 m x 5 m y en ella se tomaron 60 muestras de suelo en una malla de 1 m x 0,5 m. La persistencia de la repelencia al agua se evaluó con el método del WDPT en muestras tamizadas a 1 mm. Se presentó un alto número de muestras fuertemente repelentes al agua en todas las condiciones de trabajo, siendo mayor la frecuencia en ciprés que en roble. Tanto la repelencia al agua como la humedad presentaron comportamiento diferencial por cobertura y por posición en la vertiente dentro de la misma cobertura. No se pudo establecer una relación consistente entre el contenido de humedad de las muestras y la persistencia de la repelencia al agua que presentaron, así como tampoco se pudo definir una zona de transición de humedad crítica para que se manifestara la repelencia al agua en ellas, en ninguna de las dos coberturas vegetales y en ninguna posición en la vertiente.In two hillside of the Piedras Blancas watershed ( Medellín, Colombia was studied the relation humidity - persistence of the water repellency on the surface of the andisols under two vegetable covers: Cupressus lusitanica (cypress and Quercus humboldtii (oak groves. These were found in three different positions along the side of low hills: upper, middle and lower grounds, as well as in two conditions of humidity: with the humidity acquired when equilibrated with the air during two days (samples

  9. Sistema interconectado de canales de marea del estuario de Bahía Blanca, Argentina: evaluación de la circulación de sedimento como carga de fondo por métodos acústicos An interconnected system of tidal channels in Bahia Blanca estuary, Argentina: an evaluation of bedload sediment transport through acoustic methods

    Directory of Open Access Journals (Sweden)

    Silvia S Ginsberg

    2009-01-01

    Full Text Available El estuario de Bahía Blanca, ubicado al sur de la provincia de Buenos Aires (Argentina, constituye una costa baja con extensas llanuras de marea, islas y una compleja red de canales de diferentes magnitudes. Estos últimos integran un sistema de canales interconectados. El objetivo de este trabajo es establecer la circulación sedimentaria como carga de fondo en un sistema de canales interconectados (Cabeza de Buey, El Alambre, La Lista y Principal mediante el análisis de los rasgos morfológicos de fondo, utilizando métodos acústicos (ecosonda y sonar lateral. El canal Cabeza de Buey se comunica con el canal La Lista a través del canal El Alambre. Los dos primeros vierten sus aguas en el canal Principal. El canal Cabeza de Buey posee un lecho plano constituido por material pelítico con arena muy fina. En su tramo más interno se presentan dunas medianas compuestas por arena fina, con un perfil asimétrico según el reflujo. Estas formas, continúan su desarrollo ininterrumpidamente hacia el canal El Alambre, donde se originan dunas grandes (altura 1,5 m formadas por arena muy fina. Sus crestas son sinuosas o barjanoides y poseen su talud hacia la corriente de bajante. En el canal La Lista se determinan dunas asimétricas medianas orientadas según el reflujo y grandes linea-ciones sedimentarias (sand ribbons sobre un fondo consolidado. El sedimento movilizado por la corriente corresponde a la fracción limo-arena fina. La distribución y configuración de las geoformas evidencian que el transporte sedimentario como carga de fondo se concentra principalmente en el canal La Lista. Es así como en el sistema de canales estudiado, sólo un canal de marea regula la dispersión de arena, transportando un importante volumen hacia el canal de navegación.Bahia Blanca estuary located in the south of Buenos Aires province, Argentina, is characterized by a low coastal area with large tidal plains, islands, and a complex network of tidal channels of

  10. Primer registro de megafloras y palinología en estratos de la Formación Tarija (Pennsylvaniano, Arroyo Aguas Blancas, Provincia de Salta, Argentina: Descripción de dos especies nuevas First record of megafloras and palynology in the Tarija Formation (Pennsylvanian, Aguas Blancas creek, Salta Province, Argentina: Description of two new species

    Directory of Open Access Journals (Sweden)

    Mercedes di Pasquo

    2009-01-01

    Full Text Available Se analiza e ilustra, por primera vez, una tafoflora hallada en estratos de la Formación Tarija que aflora en Arroyo Aguas Blancas, Provincia de Salta, Argentina. Se describen, también, dos especies nuevas: Malanzania starckii (licofita y Grumosisporites delpapae (espora trilete. Se reconocieron improntas de semillas platispérmicas (Sama-ropsis nunezii García emend. A. Archangelsky, Cordaicarpus cesariae Gutiérrez, Ganuza, Morel y Arrondo emend. A. Archangelsky, improntas de tallos articulados {Paracalamites australis Rigby emend. Zampirolli y Bernardes de Oliveira y compresiones/improntas de fragmentos foliares (Cordaites riojanus Archangelsky y Leguizamón, Ginkgo-phyllum sp. cf. G. diazii Archangelsky y Arrondo. Esta asociación es atribuida al Pennsylvaniano s.l. sobre la base de la distribución estratigráfica de las especies seminales. La asociación palinológica se compone de 101 especies, 53 de ellas reconocidas como autóctonas y 48 retrabajadas. El primer conjunto comprende 34 especies de esporas trilete, 11 granos de polen monosacado, un grano bisacado y siete especies de algas. El grupo retrabajado se compone de 27 esporas trilete y criptosporas, 20 especies de acritarcas, prasinofitas y otras algas y un quitinozoario. La presencia de especies exclusivas de la BiozonaD. bireticulatus-C. chacoparanensis (BC (e.g., Dictyotriletes bireticulatus (Ibrahim Potonié y Kremp emend. Smith y Butterworth, Crucisaccites latisulcatus Lele y Maithy, Verrucosisporites morulatus (Knox Potonié y Kremp emend. Smith y Butterworth, permite acotar su edad al Bashkiriano tardío-Moscoviano. La vegetación, compuesta principalmente por licofitas, esfenofitas, pteridofitas y gimnospermas, se habría desarrollado en diferentes ambientes continentales como lagos y ríos alimentados por glaciares de montaña.Fossil plant remains found in the Tarija Formation cropping out at the Aguas Blancas creek, Aguaragüe range, Salta Province, Argentina, are analy

  11. CIUDAD BLANCA EN BAHÍA DE ALCUDIA. UNA OBRA CON SENTIDO PEDAGÓGICO DEL PROFESOR FRANCISCO JAVIER SÁENZ DE OÍZA. 1961-63 / Ciudad Blanca in Alcudia Bay. An educational work by professor Francisco Javier Sáenz de Oíza. 1961-63

    Directory of Open Access Journals (Sweden)

    Rosa María Añón Abajas

    2015-05-01

    Full Text Available RESUMEN La expansión económica de España en la década de los 60 del pasado siglo XX, se relaciona directamente con el acceso mayoritario de la clase media a las vacaciones estivales y con la explosión del turismo de costa. Entre la multitud de promociones que empezaron a transformar el litoral mediterráneo, Ciudad Blanca proyectada por Sáenz de Oíza en la Bahía de Alcudia, aunque no concluida por completo, ejemplifica cómo un encargo especulativo para acoger a una gran masa de veraneantes, puede aprovechar la euforia del momento, ensayando un modelo residencial ideal, en un contexto próximo a los debates de arquitectura que se estaban dando en el resto de Europa, abordados por los arquitectos de la “Tercera Generación”, que pretendían la superación de los dogmatismos del Movimiento Moderno. La lección que el Oíza profesor nos lega a través de esta experiencia, aparte del modo de proceder, enfrentándose con cierta dosis experimental cual alumno afrontando un ejercicio académico innovador, reside en el valor didáctico de mostrar mediante una serie de mecanismos proyectuales, la vital atención prestada al paisaje y al habitante, a la exterioridad y a la interioridad de la obra, desarrollando una empatía entre el lugar y el momento, que generó un mestizaje interesante entre nuevos conceptos de agrupación, ejecutados con sistemas estructurales racionalistas en los que se introducen elementos puntuales prefabricados, combinando tradición y novedad.

  12. Seis actuaciones del profesional de enfermería para prevenir los falsos diagnósticos de hipertensión: La hipertensión de bata blanca y el efecto de bata blanca Six performances of the nurse in order to prevent an erroneous diagnosis of essential hypertension: white coat hypertension and white coat effect

    Directory of Open Access Journals (Sweden)

    Isaac Amigo

    2005-03-01

    Full Text Available La hipertensión de bata blanca (HBB puede considerarse como un falso diagnóstico de hipertensión que puede provocar tratamientos farmacológicos innecesarios, afectar a la calidad de vida de las personas e incrementar de un modo notable el gasto sanitario. Se calcula que la prevalencia de la HBB se situaría en torno a un 20% de los pacientes diagnosticados como hipertensos. Las investigaciones experimentales subrayan que la enfermera obtiene, en general, medidas más fiables de la presión arterial (PA que los médicos y que por ello puede desempeñar un papel fundamental para prevenir estos falsos diagnósticos. En esta línea se subrayan seis actuaciones profesionales que contribuirían de manera decisiva para prevenir estos errores.White coat hypertension (WCH can be considerated an erroneous diagnosis of essential hypertension and can represents a serious problem when we consider the clinical and pharmacological and economic consequences of an incorrect blood pressure measurement. The prevalence of WCH is situated around 20% of the patients diagnosed as having high blood pressure. The results from different studies point out that the nurses usually obtain more reliable blood pressure readings than the doctors, because of that they can play an important role in the control of WCH. In relation to this a total of six specific recommendations are put forward with the aim of preventing an erroneous diagnosis of essential hypertension.

  13. “Gate and Port of the South of Argentina”? Nuances and Debates in the Image of Bahia Blanca City in Its Regional Context in the Mid-twentieth Century

    Directory of Open Access Journals (Sweden)

    Juliana López Pascual

    2016-01-01

    Full Text Available For over a century the people of Bahia Blanca, Argentinian port city located at the south west of the province of Buenos Aires, they have imagined it and defined it not only as part of the Patagonian territories but also as their legitimate political, economic and cultural center. The aim of historicizing and questioning this idea, trying to account for the interests that were mobilized, the ideological postures that hinted, and the impact it had on the effective regional layout, is what motivates our research. To that end, this article does focus on economic and infrastructural dimension that some debates of mid-twentieth century used simultaneously as evidence and as ultimate goal of this alleged hegemony. For this purpose, we will analyze the writings of Domingo Pronsato and Ricardo M. Ortiz whom, from different geopolitical perspectives, devised specific roles for the city that suited their plans for the regional development of Patagonia.

  14. Seguimiento anual de la parasitosis gastrointestinal de venados cola blanca Odocoileus virginianus (Artiodactyla: Cervidae en cautiverio en Yucatán, México

    Directory of Open Access Journals (Sweden)

    Rubén C. Montes Pérez

    1998-09-01

    Full Text Available El objetivo del presente estudio fue determinar los géneros y estimar la cantidad de huevecillos y ooquistes de parásitos gastrointestinales (PGI excretados durante un año en heces de venados cola blanca (Odocoileus virginianus yucatenensis mantenidos en cautiverio en Yucatán, México. Se recolectaron muestras fecales en tres confinamientos ubicados en la zona centro del estado de Yucatán, de enero a diciembre de 1995. Diez muestras fueron colectadas de cada confinamiento cada dos semanas. Las muestras fueron procesadas mediante la técnica de Flotación Centrifugada y McMaster. Se realizaron cultivos de heces para obtener larvas infectantes L3 mediante la técnica de Corticelli-Lai. Las heces positivas a ooquistes fueron cultivados en dicromato de potasio al 2%. Se determinaron siete géneros (Haemonchus spp, Cooperia spp, Isospora spp, Eimeria spp, Trichuris spp, Strongyloides spp y Moniezia spp correspondientes a cinco órdenes. Haemonchus spp, Isospora spp y Eimeria spp fueron los géneros más frecuentes. El género Isospora se reporta por primera vez en venados de la región, aunque no fue posible explicar el origen de este hallazgo. La frecuencia y nivel de excresión de huevecillos y ooquistes de PGI fue variable durante el año, con incremento en la época de lluvia. Se encontró correlación positiva entre humedad relativa, temperatura ambiente y precipitación pluvial con los órdenes Coccidia y Strongylida. En la zona centro del estado de Yucatán, México, las condiciones meteorológicas en la época de lluvia son propicias para el desarrollo del parasitismo gastrointestinal, lo que permite mayor riesgo de infección en los venados.Gastrointestinal parasites, and egg and oocyst output in the faeces of captive white-tailed deer (Odocoileus virginianus yucatanensis were recorded in Yucatan, Mexico. Feces were obtained from from January through December 1995 (ten samples every two weeks per place. Samples were processed by

  15. Hábitos alimentarios del venado cola blanca Odocoileus virginianus (Artiodactyla: Cervidae en el Parque Natural Sierra Nanchititla, Estado de México

    Directory of Open Access Journals (Sweden)

    Ulises Aguilera-Reyes

    2013-03-01

    Full Text Available El venado cola blanca es una especie con una gran plasticidad conductual y de adaptación en diferentes hábitat. En el Parque Sierra Nanchititla en el Estado de México se realizó un estudio para determinar los hábitos alimentarios en el bosque mesófilo de montaña (BMM y bosque de pino-encino (BPE. De junio 1990 a mayo 1992 se recolectaron 104 muestras de excremento de venado en las dos zonas de estudio. Aplicamos el índice de Morisita y la correlación de Spearman para determinar la preferencia alimentaria. Se utilizó el análisis histológico de heces fecales para herbívoros las cuales se compararon con muestras de tejidos vegetales de plantas de la zona de estudio. Los resultados muestran que consume el 79.44% de especies vegetales del BMM y 20.56% del BPE. Existe cierta tendencia en la selectividad de 12 de las 14 especies de plantas localizadas en el BMM, mientras que para el BPE no se aprecia tal tendencia. Las especies clave que for- man parte de la alimentación elemental del venado fueron: Acalypha setosa, Smilax pringlei, Psidium sartorianum y Dendropanax arborea. El consumo de plantas no varió sig- nificativamente entre la época seca y lluviosa en función de la forma biológica (X2=12, p=0.21. Sin embargo, durante la época seca existe cierta tendencia a consumir árboles y a finales de la época de lluvia a consumir hierbas (Z=1.61, p=0.95. Los datos indican que el venado puede ser selecti- vo con plantas del BMM, mientras que para el BPE tiende a ser oportunista.Food habits of the white-tailed deer, Odocoileus virginianus (Artiodactyla: Cervidae in Nanchititla Natural Park, Mexico. White-tailed deer is a species with a large behavioral plasticity and adapta- tion to different habitats, including their food habits. This study was conducted with the aim to determine the food habits of this species in the cloud (BMM and pine-oak (BPE forests. Deer scats and plant samples were obtained following standard methods, from Sierra

  16. Cenizas del tamo de arroz como substituto del feldespato en la fabricación de cerámica blanca

    Directory of Open Access Journals (Sweden)

    Amigó B, Vicente

    2013-02-01

    Full Text Available The substitution of raw materials for processing high energy consumption materials by agricultural and agro-industrial wastes causes a positive impacts on the environment preservation. One of these residues is rice straw, which according to FAO estimation, its annual production is about 600 million tons. In this research was studied the use of rice straw ash (RSA as substitute of the use of feldspar in the whiteware production. Clay-feldspar-quartz porcelains are referred to as triaxial whiteware. Specimens of semidry triaxial mixtures, where feldspar was substituted for different percentages of CTA, were prepared by uniaxial pressing, followed by drying and sintering. Physical and mechanical properties of sintered bodies were evaluated. The porosity and the compressive strength of the fired pieces do increase with additions of up to 75% of CTA in substitution of feldspar. Their mineralogical phases were determined by DRX and SEM; grains of quartz, and needles of primary and secondary mullite were identified in a vitreous phase. It was concluded that feldspar can be substituted positively by CTA in whiteware pastes.

    La sustitución de materias primas para procesamiento de materiales -de alto consumo energético- por residuos agrícolas y agroindustriales impacta positivamente el medio ambiente. Uno de estos residuos es la paja o tamo de arroz, del cual la FAO estima que su disponibilidad mundial ronda los 600 millones de toneladas por año. En éste artículo se presentan los resultados de una investigación sobre la utilización de una ceniza de tamo o paja de arroz (CTA como substituto del feldespato en la fabricación de cerámica blanca de tipo triaxial. Se prepararon mezclas donde la ceniza sustituyó al feldespato en volúmenes distintos. Especímenes de las pastas obtenidas fueron moldeados, secados, y cocidos. Se evaluaron las propiedades físicas y mecánicas de las cerámicas cocidas. La porosidad y la resistencia a la compresi

  17. Bernardo Salcedo: una carta blanca

    Directory of Open Access Journals (Sweden)

    Santiago Mutis Durán

    2007-01-01

    Full Text Available El presente ensayo es una interpretación de la obra del artista conceptual Bernardo Salcedo -recientemente fallecido- como supuesto miembro colombiano de un nuevo periodo internacional iconoclasta.

  18. Oro negro del Caribe en la Bahía Blanca. El transporte naval de petróleo en el camino al autoabastecimiento en Argentina (1951-1963.

    Directory of Open Access Journals (Sweden)

    José Antonio Mateo Oviedo

    2015-01-01

    otros aperturistas e internacionalistas. Como insumo, fue muchas veces el talón de Aquiles de los proyectos de desarrollo, donde los cárteles petroleros pendulaban entre abastecerlo o extraerlo con fuertes concesiones. Al ser Argentina un país con petróleo, la producción nacional y la importación se combinaron con distintas proporciones según lo que podía producir la empresa nacional o lo que podía importarse según los recursos disponibles. Un aspecto de esta problemática sin embargo no ha sido tratado y responde a una serie de interrogantes tales cómo ¿Cuál fue la progresión del ingreso de petróleo en Bahía Blanca en relación al total del país? y ¿Cómo se refleja la tendencia al autoabastecimiento en ambos niveles de integración? ¿Dónde se producía el petróleo importado? ¿Cómo se transportaba? ¿Quiénes lo transportaban? Y finalmente ¿Cómo impactó la política petrolera en la navegación?, es decir ¿Cómo impactaron en la navegación la importación y los contratos petroleros en la distribución de petróleo entre los lugares de producción, refinamiento y consumo? A partir de los datos aportados fundamentalmente por los libros de la Aduana de Bahía Blanca, intentaremos responder a estas y otras preguntas.

  19. LA VALORIZACIÓN DEL OCIO COMO FACTOR DE IDENTIFICACIÓN SOCIAL. ANÁLISIS DESDE UNA PERSPECTIVA ESPACIAL EN LA CIUDAD DE BAHÍA BLANCA (ARGENTINA

    Directory of Open Access Journals (Sweden)

    Paola Rosake

    2017-07-01

    Dentro da dinâmica da globalização, estamos testemunhando um processo contraditório de homogeneização de padrões culturais, formas de comportamento de consumo e de lazer; enquanto as individualidades são exacerbadas, enfraquecendo as ligações que articulam identidades. Na sociedade de hoje o consumo de lazer simboliza status social e distinção, ou seja, um fator de identificação social. Este trabalho situou-se na perspectiva da análise espacial do lazer e a sua área de estudo foi a cidade de Bahía Blanca, cidade média localizada na região sudoeste da província de Buenos Aires, Argentina. O principal objetivo da pesquisa foi analisar a importância que os espaços de lazer da cidade têm como lugares de identificação social para a população, considerando a importância que as atividades de lazer adquirem hoje. Definiu-se como metodologia o tipo de pesquisa descritiva e exploratória: realizou-se a revisão e seleção da literatura bibliográfica sobre o tema e usou-se como ferramenta exploratória a entrevista com residentes. Os resultados permitem determinar, como uma primeira aproximação, que a cidade de Bahía Blanca não está alheia aos processos urbanos contraditórios, resultados da adaptação das cidades às mudanças económicas e culturais globais. Palavras-chave: Lazer; Consumo; Espaço; Identificação Social.

  20. Abundancia, tamaño y estructura poblacional del tiburón punta blanca de arrecife, Triaenodon obesus (Carcharhiniformes: Carcharhinidae, en Bahía Chatham, Parque Nacional Isla del Coco, Costa Rica

    Directory of Open Access Journals (Sweden)

    Ilena Zanella

    2012-11-01

    Full Text Available Doce especies de tiburones habitan las aguas del Parque Nacional Isla del Coco (PNIC y uno de los más abundantes es el tiburón punta blanca de arrecife, Triaenodon obesus. El presente estudio determinó la abundancia, tallas y estructura de la población de esta especie en la zona de Bahía Chatham, PNIC. Se utilizó el método de marcaje y recaptura y se realizaron conteos subacuáticos visuales, con el fin de determinar su abundancia relativa y contabilizar recapturas visuales. Los tiburones punta blanca de Bahía Chatham no presentan segregación ontogénica espacial definida; pero si una alta fidelidad a los a sitios de residencia dentro de esta bahía. La longitud total promedio de los tiburones marcados fue de 101.8±12.1cm, con una longitud total máxima de 130.0cm y una mínima de 71.0cm. La mediana de las longitudes totales de los tiburones machos (103.5±21.33cm y hembras (100.1±11.2cm no difirieron significativamente (H = 1.78; p=0.1818. La abundancia relativa en Bahía Chatham, PNIC fue de 49.5±10.4 tiburones/h. El tamaño estimado de la población usando el método de de captura-recaptura fue de 408 (IC=181-1050.

  1. Aspects of radiological safety and protection in the decontamination of the Benefit plant of uranium in Ciudad Aldama and in the storage of its residues in Pena Blanca, Chihuahua, Mexico; Aspectos de seguridad y proteccion radiologica en la descontaminacion de la planta de beneficio de uranio en Ciudad Aldama y en el almacenamiento de sus residuos en Pena Blanca, Chihuahua, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz C, M.A. [Facultad de Quimica, UNAM (Mexico)

    1998-07-01

    Between 1969 and 1971 the National Commission of Nuclear Energy and the Mining Fostering Commission operated coordinately a production plant of uranium and molybdenum concentrates (Benefit plant) at Ciudad Aldama, Chihuahua, Mexico. During two years of operation some 45 tonnes of uranium concentrate and approximately 35,000 tonnes of uranium wetlands were produced. These last were stored in a dam to 120 m. toward West of the plant. Due to the nearness of the population with respect to what was the Benefit plant and over all to the wetland dam, the objective of this work had two main aspects: On the one hand, to carry out the works of radiological decontamination of the benefit plant of uranium, according to the established normative by the Regulatory organization in matter of radiological safety and protection (CNSNS) for the population and the hard workers. After that the works mentioned were realized it was considered that the estate which comprises what was the Benefit plant did not reach the established criteria by the CNSNS for being considered of unrestricted use such estate and it was not allowed any type of construction in the zone which could be showed the residual contamination which remains there. On the other hand, to determine the site where could be stored the radioactive wastes generated by the radiological decontamination and the wetland mobilization for its definitive storage in benefit of the present population and of the future generations due to the radionuclides which are in a such material. The site more adequate technical and economically to storage the wastes generated by this activity was evaluated. Whereby studies about demography, use of soil and water, meteorology, hydrology and ecology were realized. The site selected being in the Pena Blanca mountains, Chihuahua, place where is located one of the uranium zones and the most important of the country. In this work, specific objectives also were treated such as: knowing the radiological

  2. RECUPERACIÓN DE ESPACIOS URBANOS Y PERIURBANOS MEDIANTE LA IMPLEMENTACIÓN DE PARQUES-HUERTAS EN LA CIUDAD DE BAHIA BLANCA

    Directory of Open Access Journals (Sweden)

    Jezabel Franza

    2008-12-01

    desarrolla un sentimiento distintivo de territorialidad. El objetivo de la presente comunicación es brindar los fundamentos y bases para la implementación de este tipo de espacios de agricultura urbana y periurbana en la ciudad de Bahía Blanca. Esta clase de proyectos puede ser entendido como una posibilidad de progreso en la gestión ambiental urbana para ciudades como la mencionada donde existe una escasa política en relación con los espacios ociosos y la única respuesta, en el mejor de los casos, es transformar estas tierras en espacios de circulación peatonal. La metodología se sustenta en la recopilación, análisis e interpretación de material bibliográfico y testimonios de informantes claves mediante el empleo de técnicas cualitativas propias de la Geografía Humana. Para ello se emplea como base del análisis la experiencia de la ciudad de Rosario, la cual es pionera en esta modalidad de recuperación de espacios y se incluye en un proyecto integral de desarrollo urbano singular. Creemos conveniente mencionar que el presente trabajo surge como instancia evaluadora final de la Cátedra Curso de Desarrollo Ambiental Urbano dictado por la Dra. María Amalia Lorda, correspondiente a los Ciclos de Orientación Organización y Ordenamiento del Espacio Urbano y Regional y Gestión de los Recursos Naturales y Medio Ambiente del quinto año de la Licenciatura en Geografía del Departamento de Geografía y Turismo de la Universidad Nacional del Sur. Asimismo el escrito es una inquietud grupal que propone recuperar espacios urbanos degradados mediante la iniciativa de agricultura urbana a través de la implementación de parques-huerta.

  3. Optimizacion de una técnica para la detección de patologías virales en Pleoticus Muelleri (Bate, 1988 en el estuario de Bahía Blanca, Argentina

    Directory of Open Access Journals (Sweden)

    Ana M. Roccamo

    2010-06-01

    Full Text Available La comercialización de animales acuáticos require la implementación de controles sanitarios para la detección de virus patógenos estipulados por la Organización Mundial para la Salud Animal (OIE. De acuerdo con sus normas, y específicamente en lo que se refiere la comercialización de crustáceos, la OIE determina como enfermedades de declaración obligatoria, entre otras, a las denominadas: virus del síndrome de la mancha blanca (WSSV, virus de la cabeza amarilla (YHV y el virus del síndrome de Taura (TSV, las cuales son altamente peligrosas. El objetivo de este estudio fue determinar la presencia o ausencia de estas virosis en poblaciones de langostinos silvestres (Pleoticus muelleri en el estuario de Bahía Blanca, aplicando metodologías bioquímicas, de biología molecular y genéticas. Los resultados demuestran que se ha logrado optimizar la metodología para la extracción y purificación de ADN y ARN de tejido y hemolinfa de langostinos y el correcto manejo en la captura, acondicionamiento y transporte de los animales al laboratorio. Los ensayos fueron debidamente convalidados por reacciones de control negativas y positivas. En las muestras estudiadas de Pleoticus muelleri se descarta la presencia de estas tres enfermedades virales. Esta metodología permite no sólo realizar una detección temprana y un diagnóstico de las tres patologías virales sino también establecer y asegurar un status libre de infección con el consiguiente beneficio sanitario para la región.Trade in aquatic animals calls for the implementation of controls for the detection of pathogenic viruses in line with the regulations of the OIE, the World Organization for Animal Heath. In relation specifically to trade in crustaceans, the OIE identifies the following diseases: White Spot syndrome virus disease (WSSV; Yellow Head Virus disease (YHV; and Taura syndrome virus disease (TSV, all of which are highly dangerous. The purpose of this study was to

  4. Blanca Wiethüchter: des-nombrando el paisaje. Políticas y poéticas de la representación en la década de los 80 en Bolivia

    Directory of Open Access Journals (Sweden)

    Mauricio Duarte

    2011-01-01

    Full Text Available This article examines the relationship between poetic writing and the discourse of landscape in Madera Viva y árbol difunto (1982 by Blanca Wiethüchter (1947-2004. Landscape is often understood as a modern device of normative representation in which people and places are classified merely as private property. I argue that Wiethüchter’s poetry establishes a counter-narrative of the landscape through the use of a poetic gaze that reinstates social and marginal imaginaries by recognizing the materiality of such landscape and, most importantly, the political role of imagination in shaping the sense of the real. In doing so, I show how Wiethüchter uses poetic language to claim multiple and conflictive realities that lie beneath the names and harmonic appearances of things. Finally, by analyzing Wiethüchter’ poetic and critical work in dialogue with thinkers and scholars such as García Linera, Mamani, Zavaleta Mercado, and Rivera Cusicanqui, this article contributes to the understanding of the politics of representation during the 1980s in Bolivia.ResumenEste artículo examina la relación entre la escritura poética y el discurso del paisaje en Madera Viva y árbol difunto (1982 de Blanca Wiethüchter (1947-2004. A menudo el paisaje es entendido como un mecanismo moderno de representación normativa en la cual los sujetos y los lugares son clasificados simplemente como propiedad privada. Nuestro argumento propone que la poesía de Wiethüchter establece una contra-narrativa del paisaje a través del uso de una mirada poética que reinstala imaginarios sociales y marginales al reconocer la materialidad del paisaje y, más aún, el rol político de la imaginación en la configuración del sentido de realidad. Al proponer lo anterior, se muestra cómo Wiethüchter usa el lenguage poético para reclamar realidades múltiples y conflictivas anquilosadas bajo la armónica apariencia de las cosas. Finalmente, al analizar la obra poética y cr

  5. Coastal landscape evolution on the western margin of the Bahía Blanca Estuary (Argentina) mirrors a non-uniform sea-level fall after the mid-Holocene highstand

    Science.gov (United States)

    Pratolongo, Paula; Piovan, María Julia; Cuadrado, Diana G.; Gómez, Eduardo A.

    2017-08-01

    Sedimentary descriptions and radiocarbon ages from two cores obtained from coastal plains along the western margin of the Bahía Blanca Estuary (Argentina) were integrated with previous information on landscape patterns and plant associations to infer landscape evolution during the mid-to-late Holocene. The study area comprises at least two marine terraces of different elevations. The old marine plain (OMP), at an average elevation of 5 m above mean tidal level (MTL), is a nearly continuous flat surface. The Recent marine plain (RMP), 2 to 3 m above MTL, is a mosaic of topographic highs and elongated depressions that may correspond to former tidal channels. Mollusks at the base of the OMP core (site elevation 5.09 m above MTL), with ages between 5,660 ± 30 and 5,470 ± 30 years BP, indicate a subtidal setting near the inland limits of the marine ingression. The sandy bottom of the core is interpreted as the last stage of the transgressive phase, followed by a tight sequence of dark laminated muds topped by a thick layer of massive gray muds. The RMP core (site elevation 1.80 m above MTL) has a similar sedimentary sequence, but unconformities appear at lower elevations and the massive mud deposits are less developed. The thickness of the grayish mud layer is a major difference between the OMP and RMP cores, but deeper layers have similar ages, suggesting a common origin at the end of the transgressive phase. The overlying massive muds would correspond to rapid sedimentation during a high sea-level stillstand or slow regression. It is proposed that, after a rapid sea-level drop to about 3 m above MTL, a flat and continuous surface corresponding to the OMP emerged, and more recent coastal dynamics shaped the dissected landscape of the RMP. For the Bahía Blanca Estuary, smooth regressive trends have been proposed after the mid-Holocene highstand, but also stepped curves. A stillstand or slowly dropping sea level was described around 3,850 ± 100 years BP, as well as

  6. Creación de locales industriales en Bahía Blanca (1985-1994: caracterización de los principales factores de atracción y de desplazamiento

    Directory of Open Access Journals (Sweden)

    Silvia Gorenstein

    1998-03-01

    Full Text Available Este documento presenta un estudio de caso del proceso de entrada a un ambiente regional determinado. El enfoque principal recae sobre el papel que juega la estructura económica local y su evolución como factores importantes que inducen y restringen las decisiones individuales en la formación de nuevas empresas. Los datos se refieren a una ciudad intermedia de la provincia principal de Argentina (Bahía Blanca que, a diferencia de la evolución del sector manufacturero en el plano nacional, muestra una tasa positiva de formación de nuevas empresas entre los últimos dos censos económicos (1985/1994. En la segunda parte, se presenta una encuesta de las contribuciones más destacadas y racionalizaciones del proceso de entrada. En la tercera parte, el primer paso para el estudio de caso se realiza con una caracterización de los componentes principales del ambiente regional que afectan el nivel y la calidad de la tasa de formación de nuevas empresas. La cuarta parte analiza la evolución del número de empresas manufactureras entre 1985 y 1994 e identifica las actividades y el tamaño de los establecimientos donde el proceso de entrada fue más intenso. Finalmente, una serie de inferencias directas y conclusiones ponen fin al documento. La conclusión principal es la ausencia de efectos positivos de 'tironeo' y el papel predominante que juegan los efectos de desplazamiento negativos. Subrayamos el que la naturaleza de los factores que precipitan las decisiones individuales relacionadas con la nueva formación de empresas limita la calidad de las compañías que emergen burachnik@criba,edu.ar y sgoren@criba.edu.arThis paper provides a case study of the entry process in a particular regional environment. The main focus is on the rol of the local economic structure and its evolution as important factors inducing and constraining individual decisions of new firm formation. The data relates to the case of an intermediate city of Argentina's main

  7. Compatibilidad de Eretmocerus mundus Mercet (Hymenoptera: Aphelinidae) y Amblyseius swirskii Athias-Henriot (Acari: Phytoseiidae), importantes enemigos naturales de la mosca blanca Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) en cultivos hortícolas, con nuevas barreras físicas selectivas y modernos plaguicidas

    OpenAIRE

    Fernández Gallego, María del Mar

    2016-01-01

    Los programas de Gestión Integrada de Plagas (GIP) promueven el uso de estrategias de control que sean respetuosas con el medio ambiente, sin embargo el uso de insecticidas en los cultivos hortícolas sigue siendo necesario para el control de determinadas plagas, como es el caso de la mosca blanca Bemisia tabaci (Gennadius). Por ello, el objetivo de esta tesis es el estudio de la integración de las tres estrategias de control más empleadas hoy en día para el control de plagas: el control bioló...

  8. Comparar la exportación de granos del Puerto Quequén con, la producción nacional de granos (soja, maíz, trigo y girasol), la exportación de granos desde los puertos de Rosario y principalmente del mayor competidor Bahía Blanca, y presentar alternativas para mejorar la relación

    OpenAIRE

    Ciccarelli, Fabián

    2010-01-01

    El propósito de la tesis es identificar las causas de la menor evolución en las exportaciones de granos realizadas por el Puerto Quequén (anexo III), respecto al crecimiento constante de la producción del país y al incremento en las exportaciones de los puertos de Bahía Blanca y Rosario, dado que es un eslabón crítico que impacta directamente en la cadena agroindustrial exportadora, la cual representa aproximadamente el 70% del PBI de la comunidad de Necochea/Quequén. Para la identificación d...

  9. Asociación entre la mutación homocigota c.318A>T en el exón 2 del gen EIF2B5 y la forma infantil de la leucoencefalopatía con sustancia blanca evanescente

    OpenAIRE

    Carmen Esmer; Gabriela Blanco Hernández; Víctor Saavedra Alanís; Jorge Guillermo Reyes Vaca; Antonio Bravo Oro

    2017-01-01

    Introducción: La leucoencefalopatía con sustancia blanca evanescente es una de las leucodistrofias más frecuentes. Generalmente inicia en la infancia y presenta un patrón de herencia autosómica recesiva. El 90% de los casos manifiesta mutaciones en uno de los genes que codifican para las cinco subunidades del factor de iniciación eucariótica 2 (EIF2B5). El diagnóstico se realiza por las manifestaciones clínicas, hallazgos en la resonancia magnética cerebral y estudios moleculares confirmatori...

  10. Estudio del comportamiento de los recargues multicapas de depósitos soldados de fundición blanca al cromo // Study of the hard facing weld behavior in deposits of white chromium steels.

    Directory of Open Access Journals (Sweden)

    R. Collazo-Carceller

    2009-05-01

    Full Text Available Se determina la influencia de los parámetros Energía introducida (Hi, Número de capas (Nc yAncho del depósito (Ad, en la morfología y el incremento de la resistencia al desgaste abrasivo decapas depositadas sobre acero 1020 utilizando el electrodo de fundición blanca al cromo UTPLedurit – 61. Empleando la microscopia óptica se identificaron y cuantificaron las fases presentes,analizando su efecto en el desgaste. Siendo determinante la influencia de la inclinación de lasdendritas y su posición con respecto a 90° en el incremento de la resistencia al desgaste abrasivo.Se caracterizaron los posibles mecanismos de daño superficial provocado por desgaste abrasivoempleando la microscopia electrónica de barrido. Se propusieron modelos lineales paracorrelacionar la influencia de la cantidad, tamaño, dispersión de los carburos y el ángulo deinclinación de las dendritas, en el incremento de la resistencia al desgaste.Palabras claves: morfología, desgaste abrasivo, parámetros de soldadura, dendritas, modelos.__________________________________________________________________________AbstractThe influence of different parameters in layer morphology and abrasion resistance of Fe-Cr-Celectrodes UTP Ledurit – 61 on steel 1020 was studied. Introduced Energy (Hi, Number of Layers(Nc, and Deposit Width (Ad were the main parameters considered. The metallographicidentification and quantification of metal phases and the determination of their effect in abrasionresistance were made with optical microscopy. The abrasive wear test characterized by scanningelectron microscopy, defines a possible mechanism of surface damage. It was found that the angleformed between a normal line to the surface and the dendrite inclination is directly related withthe increment of wear resistance. Lineal models that correlate wear resistance with quantity, size,and carbide dispersion and dendrite angle inclination were also developed.Key words: morphology, abrasive

  11. Influencia de la turbidez en el efecto antimicrobiano de la luz ultravioleta y de los pulsos luminosos de luz blanca en néctar de naranja (citrus sinensis

    Directory of Open Access Journals (Sweden)

    Meregildo Silva Ramirez

    2010-01-01

    Full Text Available La presente investigación tuvo por objetivo determinar la influencia del nivel de turbidez en el efecto antimicrobiano de la luz ultravioleta y luz blanca en néctar de naranja (Citrus sinensis L.. Dicha investigación fue realizada en una cámara de tratamiento de luz UVC con paredes de espejo y una lámpara de luz ultravioleta de 15 watts. El néctar, sometido a un proceso de pasteurización (90 °C, 10 minutos, se inoculó con levadura liofilizada (Saccharomyces cerevisiae, cepa MIT L51, hasta concentraciones de 1.0; 0.1 y 0.01 % (p/p y se determinó la turbidez de las diluciones, reportando valores de turbidez de 10564, 1304 y 813 UTN respectivamente. Las muestras fueron expuestas a tres diferentes dosis, 0.57; 1.14 y 1.71 J/cm2, tomando una muestra testigo denominada “0” minutos, para efectos de análisis inicial de microorganismos. Posteriormente a la aplicación del tratamiento se realizó el recuento en placas, en medio agar Sabouraud. Obtenidos los datos en la lectura de las colonias resultantes se determinó la tasa de supervivencia en cada tratamiento y el valor de la constante de reducción decimal “D” en J/cm2. Dichos datos mostraron que la turbidez, debido a los sólidos disueltos, influencia adversamente la actividad antimicrobiana de la luz UVC. Se concluye que la actividad antimicrobiana expresada en términos de la constante de reducción decimal “D”, bajo las condiciones de tratamiento en el néctar de naranja, depende directamente de la turbidez e indirectamente del la energía total transmitida.

  12. El patrimonio cultural en los procesos de renovación de áreas turísticas litorales. Una aproximación al destino turístico de la Costa Blanca (Alicante, España

    Directory of Open Access Journals (Sweden)

    Elisa Rico Cánovas

    2016-01-01

    Full Text Available En el contexto de los procesos de renovación turística en destinos litorales consolidados, una de las acciones más utilizadas por parte de los agentes públicos y privados es la estrategia de la diversificación del producto turístico a partir de la valorización de elementos del patrimonio natural y cultural. En este trabajo se trata de realizar una breve revisión de las principales aportaciones científicas en el ámbito de la Geografía del Turismo, para posteriormente centrarse en el análisis de la amplitud y diversidad temática del patrimonio cultural del destino de la Costa Blanca (Alicante, España, área turística caracterizada por los síntomas de consolidación que sugieren los modelos evolutivos del Ciclo de Vida del Producto Turístico y las teorías de restructuración productiva. A través de esta aproximación a la potencialidad turística del patrimonio cultural, se identifica el grado de interés turístico de los elementos que conforman los principales temas patrimoniales que podrían ser argumento para la creación de productos turísticos culturales. De este modo, sería factible el desarrollo de una estrategia de diversificación del producto turístico que serviría para mejorar la situación competitiva del destino seleccionado, al tiempo que el patrimonio cultural actuaría como elemento de vertebración territorial superando la segregación funcional que habitualmente se produce entre espacios litorales e interiores.

  13. Aislamiento e identificación de hongos asociados a esclerocios de Sclerotium cepivorum, causante de la pudrición blanca de la cebolla, en la zona alta de Cartago, Costa Rica

    Directory of Open Access Journals (Sweden)

    María del Milagro Granados

    2005-01-01

    Full Text Available Se aislaron e identificaron hongos asociados a esclerocios de Sclerotium cepivorum, causante de la pudrición blanca de la cebolla, con el fin de determinar la existencia de hongos con potencial antagónico nativos en la zona alta de Cartago. Se estudiaron 10 fincas durante febrero-mayo de 2002. Cada una se dividió en 3 áreas de acuerdo al nivel de incidencia histórica de la enfermedad (bajo, intermedio, alto. En cada área se realizó un trampeo de hongos mediante la técnica de entierro de esclerocios; además se hizo muestreo de plantas enfermas, se colectó suelo para cuantificar densidad de inóculo y para realizar análisis microbiológicos, químico sencillo, de textura y determinación de materia orgánica. Los géneros encontrados en el trampeo fueron Alternaria spp., Fusarium spp., Gliocladium sp., Mucor sp., Penicillium spp., Rhizoctonia sp., Rhizopus sp. y Trichoderma spp.; en bulbos enfermos se aislaron Fusarium spp., Monilia sp., Mucor sp., Penicillium spp., Pythium sp., Rhizopus sp., y Trichoderma spp. Los géneros Gliocladium sp., Penicillium spp. y Trichoderma spp. también se hallaron en el análisis microbiológico de suelo. Las poblaciones más altas de microorganismos se recuperaron en el área intermedia de todas las fincas. Este trabajo comprueba que es posible aislar hongos con potencial antagónico, como Trichoderma spp., Gliocladium sp. y Paecilomyces sp., en suelos a los que por muchos años se les ha aplicado una gran cantidad de fungicidas.

  14. Influência da primeira alimentação na larvicultura e alevinagem do yamú Brycon siebenthalae (Characidae - DOI: 10.4025/actascianimsci.v25i1.2092 First feeding influence on yamú, Brycon siebenthalae (Characidae larval rearing - DOI: 10.4025/actascianimsci.v25i1.2092

    Directory of Open Access Journals (Sweden)

    Sandra Pardo-Carrasco

    2003-04-01

    Full Text Available Para avaliar a influência da primeira alimentação na alevinagem do yamú, Brycon siebenthalae, no Instituto de Acuicultura/Universidad de Los Llanos (Villavicencio, Colômbia, foram desenvolvidos dois experimentos. No experimento 1, testaram-se, durante vinte e quatro horas, diferentes tipos de alimento vivo como primeira alimentação das pós-larvas (PL de yamú: náuplios de Artemia sp. (NA, zooplâncton silvestre (ZS e larvas de pirapitinga (LP (Piaractus brachypomus. No tratamento controle as pós-larvas foram mantidas em jejum. O alimento que proporcionou melhores resultados em ganho de peso e comprimento total foi larvas de pirapitinga (p Two experiments were carried out at Instituto de Acuicultura de Los Llanos/Universidad de Los Llanos (Villavicencio, Colômbia to evaluate first feeding influence on yamú larval rearing. In the first experiment, the following prey types were tested to first feeding for yamú larvae during 24 hours: Artemia sp. nauplii, wild zooplankton and pirapitinga (Piaractus brachypomus larvae. In the control yamú larvae were subjected to starvation. Pirapitinga larva was the prey item that offered the best results for weight and total length gain (p < 0.05. In the second experiment, yamú larvae performance was compared when stocked into fertilized ponds during 15 days either at the onset feeding or after first feeding with pirapitinga larvae prey item. Survival rate was lower in the larvae that were stocked into rearing ponds at the onset of feeding (13.4% when compared to survival of yamú larvae that were stocked after receiving pirapitinga larvae (74.1%. These results indicate that the use of pirapitinga larvae at first feeding increases performance of yamú larval rearing.

  15. Trichodina colisae (Ciliophora: Trichodinidae: new parasite records for two freshwater fish species farmed in Brazil Trichodina colisae (Ciliophora: Trichodinidae: novo registro de parasito para duas espécies de peixes de água doce cultivadas no Brasil

    Directory of Open Access Journals (Sweden)

    Gabriela Tomas Jerônimo

    2012-12-01

    Full Text Available Family Trichodinidae comprises ciliate protozoa distributed worldwide; they are considered some of the main parasitological agents infecting cultivated fish. However, the trichodinidae parasitizing important fish species cultured in Brazil are unknown, and more taxonomic studies on this group of parasites are required. This research morphologically characterizes Trichodina colisae Asmat & Sultana, (2005 of pacu (Piaractus mesopotamicus and patinga hybrid (P. mesopotamicus × P. brachypomus cultivated in the central and southeast regions of the country. Fresh assemblies were made from mucus scraped from the skin, fins and gills, fixed with methanol and, subsequently, impregnated with silver nitrate and stained with Giemsa for assessment under light microscopy. This research reports not only the second occurrence of T. colisae in the world, but also its first occurrence in South America.Tricodinídeos são protozoários ciliados móveis com ampla distribuição mundial; são considerados um dos agentes parasitários que mais acometem peixes cultivados. No Brasil, a maioria dos tricodinídeos que parasitam importantes espécies de peixes cultivados são desconhecidos, o que requer mais estudos taxonômicos com esse grupo de parasitos. Este estudo caracteriza morfologicamente Trichodina colisae Asmat & Sultana, 2005 de pacu (Piaractus mesopotamicus e do híbrido patinga (P. mesopotamicus × P. brachypomus cultivados, respectivamente, no Centro-Oeste e Sudeste do Brasil. Foram feitas montagens a fresco do raspado de muco da pele, nadadeiras e brânquias, fixados com metanol e, posteriormente, impregnados com nitrato de prata e coradas com Giemsa para avaliação em microscopia óptica. O presente estudo relata não só a segunda ocorrência de T. colisae no mundo, mas também a primeira ocorrência na América do Sul.

  16. Seasonal prevalence of white plague like disease on the endemic Brazilian reef coral Mussismilia braziliensis Prevalencia estacional de la enfermedad de la plaga blanca en el coral endémico de Brasil Mussismilia braziliensis

    Directory of Open Access Journals (Sweden)

    Ronaldo Francini-Filho

    2010-01-01

    Full Text Available The reef coral Mussismilia braziliensis Verril, 1968 is endemic to the eastern Brazilian coast, representing a major reef-building species in the region. This coral is threatened by extinction due to the recent proliferation of a white-plague like (WPL disease. Despite its severe impacts, the environmental factors leading to outbreaks of WPL disease are still poorly understood. This study describes the seasonal prevalence of WPL disease on M. braziliensis in the Abrolhos Bank, on the southern coast of Bahia Brazil. In situ estimates showed that WPL disease was about 4.5 times more prevalent in summer (January 2007, mean sea surface temperature 27.4°C than in winter (July 2007, 25.0°C. This result suggests that the prevalence of WPL disease in M. braziliensis is temperature-dependent, supporting the hypothesis that warmer oceans are facilitating the proliferation of coral diseases worldwide.El coral Mussismilia braziliensis Verril, 1968 es endémico de la costa este de Brasil y representa una de las principales especies constructoras de arrecifes coralinos en dicha region. Este coral se encuentra bajo la amenaza de extincion debido la reciente propagacion de la enfermedad llamada la plaga blanca (PB. Pese los fuertes impactos, los factores ambientales responsables por epidemias de la PB aún son poco conocidos. En este estudio se describe la prevalencia estacional de la PB en M. braziliensis en el Banco de Abrolhos, ubicado en la costa sur de Bahia, Brasil. Estimaciones in situ comprueban que la prevalencia de esta molestia ha sido cerca de 4,5 veces mayor en verano (enero de 2007, temperatura media del agua superficial del mar 27,4°C, que en invierno (julio de 2007; 25,0°C. Este resultado sugiere que la prevalencia de la enfermedad PB en M. braziliensis es dependiente de la temperatura, reforzando la hipótesis de que los océanos mas cálidos estén facilitando la propagacion de enfermedades coralígenas en todo el mundo.

  17. Juvenile growth of white mullet Mugil curema (Teleostei: Mugilidae in a coastal lagoon southwest of the Gulf of California Crecimiento de juveniles de la lisa blanca Mugil curema (Teleostei: Mugilidae en una laguna costera del suroeste del golfo de California

    Directory of Open Access Journals (Sweden)

    Casimiro Quiñonez-Velázquez

    2011-01-01

    Full Text Available Otolith micro structure was used to determine the age and evaluate the growth of juvenile white mullet (Mugil curema during their residence in the coastal lagoon El Conchalito, B.C.S., Mexico, from May 1997 to May 1998. Juveniles were sampled monthly during the full and ebbing phases of the maximum high tide. The juveniles studied were between 16 and 42 mm standard length (SL and from 22 to 109 days old. The Gompertz growth model appropriately described the relationship between age and SL (r = 0.94. The average growth rate was 0.29 mm d-1 between 20 and 110 days of age, which was lower than the growth rate of the juveniles prior to entering the lagoon. This suggests that growth is faster along the coast than in the lagoon. The strategy of entering protected areas allows individuals to reach a size that maximizes escape from predators and, therefore, the probability of survival when reentering the coastal habitat.Utilizando la microestructura de los otolitos se determinó la edad y se evaluó el crecimiento de juveniles de lisa blanca Mugil curema durante su permanencia en la laguna costera El Conchalito, B.C.S., México, de mayo de 1997 a mayo de 1998. Los juveniles se recolectaron durante la fase estacionaria y de descenso de la maxima pleamar de cada mes. Durante el estudio, se analizaron juveniles de 16 a 42 mm de longitud estándar (LE con edad entre 22 y 109 días. El modelo de Gompertz describió adecuadamente la relación entre la edad y LE (r² = 0,94. La tasa promedio de crecimiento entre 20 y 110 días de edad fue de 0,29 mm día-1 , menor que la tasa de crecimiento de los juveniles antes de incorporarse a la laguna. Esto sugiere que el crecimiento es más rápido en la costa que en la laguna, y la estrategia de introducirse a zonas protegidas es para alcanzar una longitud que maximice el escape a la depredación y maximice la probabilidad de supervivencia cuando se reincorporen al ambiente costero.

  18. Utilización de imágenes satelitales para el estudio de la distribución térmica en distintas coberturas del suelo de la ciudad de Bahía Blanca (Argentina

    Directory of Open Access Journals (Sweden)

    F. Ferrelli

    2015-12-01

    Full Text Available El estudio del clima urbano es relevante para conocer el ambiente donde habita la mayor parte de la población. Las ciudades presentan sectores que incluyen estructuras edilicias, espacios verdes, suelos al descubierto, tránsito vehicular, necesidades calóricas de la ciudad y diferentes coberturas de sombras. Actualmente, el cambio climático y sus efectos sobre las ciudades son temas de gran interés científico. Son escasas las investigaciones que interpretan los cambios térmicos que se producen en el interior de las ciudades debido a la densificación de los edificios y como consecuencia de la variabilidad climática. Por tal motivo, el objetivo de este trabajo fue analizar el comportamiento de la Temperatura de Superficie Terrestre (TST y su relación con las distintas coberturas del suelo en la ciudad de Bahía Blanca, Argentina. Para ello, se analizaron imágenes satelitales Landsat 5 TM y 7 ETM+ con el método monocanal. Además, se realizó un mapa de coberturas del suelo mediante interpretación visual de imágenes satelitales validado por intervención empírica. Posteriormente, se relacionaron los datos de TST con las coberturas del suelo. En el centro de la ciudad, la TST presentó variaciones espaciales heterogéneas según las estaciones del año y las sombras generadas por los edificios. Los mayores valores de TST se localizaron en la periferia (45,1°C y en urbano muy disperso (46°C y el menor en el centro de la ciudad (2°C. Las distintas coberturas del suelo generaron menores fluctuaciones de TST en invierno (>5°C y las mayores en verano (entre 15 y 25°C.

  19. Aspects of radiological safety and protection in the decontamination of the Benefit plant of uranium in Ciudad Aldama and in the storage of its residues in Pena Blanca, Chihuahua, Mexico

    International Nuclear Information System (INIS)

    Ruiz C, M.A.

    1998-01-01

    Between 1969 and 1971 the National Commission of Nuclear Energy and the Mining Fostering Commission operated coordinately a production plant of uranium and molybdenum concentrates (Benefit plant) at Ciudad Aldama, Chihuahua, Mexico. During two years of operation some 45 tonnes of uranium concentrate and approximately 35,000 tonnes of uranium wetlands were produced. These last were stored in a dam to 120 m. toward West of the plant. Due to the nearness of the population with respect to what was the Benefit plant and over all to the wetland dam, the objective of this work had two main aspects: On the one hand, to carry out the works of radiological decontamination of the benefit plant of uranium, according to the established normative by the Regulatory organization in matter of radiological safety and protection (CNSNS) for the population and the hard workers. After that the works mentioned were realized it was considered that the estate which comprises what was the Benefit plant did not reach the established criteria by the CNSNS for being considered of unrestricted use such estate and it was not allowed any type of construction in the zone which could be showed the residual contamination which remains there. On the other hand, to determine the site where could be stored the radioactive wastes generated by the radiological decontamination and the wetland mobilization for its definitive storage in benefit of the present population and of the future generations due to the radionuclides which are in a such material. The site more adequate technical and economically to storage the wastes generated by this activity was evaluated. Whereby studies about demography, use of soil and water, meteorology, hydrology and ecology were realized. The site selected being in the Pena Blanca mountains, Chihuahua, place where is located one of the uranium zones and the most important of the country. In this work, specific objectives also were treated such as: knowing the radiological

  20. Innovación y desarrollo territorial en aglomeraciones industriales periféricas: el caso del Polo Petroquímico de Bahía Blanca (Argentina

    Directory of Open Access Journals (Sweden)

    Cincunegui, Carmen

    2012-02-01

    Full Text Available Since the 1980s, under a post-fordism scenery an “imagery” has been developed that represents regions as carriers of an opportunity for being more flexible and innovative than large national units. It has been emphasized also that foreign investments have an impact on innovation initiatives when an articulated social, economic and institutional context open to novelty and change exists. Regions, therefore, abandoned their position as “objects” of development to become “subjects” in charge of their own territorial development process. Under this new perspective, this article presents results of a study on innovation and territorial development in peripheral industrial agglomerations. This research analyses in the case of Bahía Blanca’s Petrochemical Pole. Investigates whether large enterprises activities have promoted territory’s competitiveness by pushing the advantages of proximity and located interaction.

    Bajo un escenario postfordista, se ha desarrollado desde la década de 1980 un “imaginario” que presenta a las regiones como portadoras de la oportunidad de actuar en forma más flexible e innovadora que las grandes unidades nacionales. Se ha enfatizado también el impacto de las inversiones extranjeras para el surgimiento de iniciativas innovadoras, siempre que exista un entorno social, económico e institucional articulado y receptivo a la novedad y al cambio. Así las regiones abandonan su pretérita situación de “objetos” de desarrollo para colocarse como “sujetos” encargados de reemprender su proceso de desarrollo territorial. Considerando este nuevo enfoque, el artículo expone los resultados de una investigación sobre innovación y desarrollo territorial en aglomeraciones industriales periféricas y analiza, para el caso del Polo Petroquímico de Bahía Blanca, si la actuación de las grandes empresas del Polo ha propiciado la competitividad del territorio al impulsar las ventajas de la proximidad

  1. Patrones de distribución y tasas de bioerosión del erizo Centrostephanus coronatus (Diadematoida: Diadematidae, en el arrecife de Playa Blanca, Pacífico colombiano

    Directory of Open Access Journals (Sweden)

    Gerardo Toro-Farmer

    2004-03-01

    Full Text Available Los erizos regulares son uno de los principales grupos de organismos bioerosionadores que destruyen los arrecifes coralinos alrededor del mundo. En el presente estudio se determinaron los patrones de distribución y abundancia y las tasas de carbonato de calcio removido en el arrecife de Playa Blanca por Centrostephanus coronatus, una de las especies de erizos más abundante en este arrecife. Para este fin se realizaron cuatro visitas al arrecife entre 1997 y 1998 durante las cuales se contabilizó el número de individuos en cada una de las principales zonas arrecifales (Trasarrecife, Plataforma-Cresta, Frente, y Talud. Las tasas de erosión fueron determinadas por medio del análisis del contenido estomacal de un número representativo de individuos colectados en cada zona. Cada sistema digestivo fue calcinado para eliminar la materia orgánica y conservar solamente la porción inorgánica de carbonato de calcio. C. coronatus presentó sus mayores densidades hacia las zonas centrales del arrecife (12.4 ind/m² ; rango 0-48 ind/m² . La tasa de bioerosión promedio más alta de C. coronatus fue de 0.103 kgCaCo3 /m² /año en la Plataforma-Cresta (rango 0 a 0.69 kgCaCo3 /m² /año. En las otras zonas (trasarrecife y frente las tasas promedio de erosión fueron 0.071 (0-0.39 y 0.052 (0-0.31 kgCaCo3 /m² /año respectivamente. De acuerdo con estos datos fue posible comprobar que la destrucción de esqueletos de corales en este arrecife por esta especie de erizo es baja, comparada con la acción abrasionadora de este tipo de organismos en otras partes del mundo. Sin embargo, la acción combinada de C. coronatus con otros organismos bioerosionadores y con algunos factores ambientales adversos para los corales, puede estar provocando un desbalance entre los procesos normales de contrucción-destrucción arrecifal en la Isla GorgonaRegular sea-urchins are one of the main bioeroding organisms affecting coral reefs around the world. The abundance

  2. Paisaje y urbanismo en la región del río Mopán (Petén, Guatemala) durante el período Clásico maya: el caso de La Blanca y su entorno

    OpenAIRE

    Ruiz García, Juan

    2017-01-01

    La presente tesis doctoral aborda la cuestión del paisaje de las Tierras Bajas mayas y su relación con el urbanismo durante el final del período Clásico (ss. VII - X) a través del caso del sitio arqueológico de La Blanca, situado en el departamento de Petén, Guatemala. El carácter geográfico y espacial del tema de investigación ha requerido del enfoque teórico y metodológico que desarrolla la arqueología del paisaje. Esta parte de la disciplina arqueológica es la que puede abordar las cuestio...

  3. Caracterización fenotípica, productiva y reproductiva de la cabra blanca Criolla del “Filo Mayor” de la Sierra Madre del Sur en el estado de Guerrero

    Directory of Open Access Journals (Sweden)

    Rubén Darío Martínez Rojero

    2013-01-01

    Full Text Available Con el objetivo de hacer una caracterización fenotípica y de determinar parámetros productivos y reproductivos de la cabra blanca Criolla del “Filo Mayor” en la Sierra Madre del Sur, estado de Guerrero, se llevó a cabo el presente estudio en el municipio de Leonardo Bravo a 17o 39 ́N y 99o 50 ́O y en el Colegio Superior Agropecuario del Estado de Guerrero (CSAEGRO ubicado a 14.5 km de Iguala, Gro., a 18o 15 ́ N y 99o 39 ́ O. Los colores de pelo predominantes en las cabras fueron el blanco y el bayo o crema (94.8%; la presencia de cuernos fue común en machos y hembras y sólo un 7.4% de éstas no los presentó. Las cabras presentaron ubres esféricas (52.8% y alargadas (47.2%, mientras que los machos cabríos presentaron testículos lobulares (46.2% y bipartidos (53.8%. Predominaron cabras con perfil recto y orejas erectas (90.4%. El peso de los machos cabríos adultos fue de 68.0 ± 2.1 kg, con una altura a la cruz de 78.8 ± 3.7 cm y un perímetro torácico de 88.5 ± 1.5 cm. Las cabras adultas presentaron un peso de 43.0 ± 3.2 kg, una altura a la cruz de 68.8 ± 2.7 cm y un perímetro torácico de 80.7 ± 3.4 cm. La tasa de fertilidad e índice de prolificidad fueron de 61.4% y 1.6 ± 0.12 crías por parto, respectivamente, con un 8.7% de abortos. El peso al nacimiento de los cabritos (sin considerar sexo ni tipo de parto fue de 2.9 ± 0.13 kg; en tanto que el peso a los 100 d de edad fue de 14.3 ± 1.2 kg, con ganancias diarias de peso del nacimiento al destete de 159.0 ± 0.15 g. La producción de leche por día fue de 785.0 ± 35.9 g y la curva de lactancia registró un pico en las semanas 3 y 4 (800 g para después descender en forma constante hasta la semana 14 (400 g. La duración de la gestación fue de 168.6 ± 2.21 d, con un periodo parto-primer estro de 136.3 ± 30 d. La ocurrencia de ciclos estrales menores a 17 días fue nula, con una alta proporción de ciclos de entre 17 a 25 d (55.2% y mayores de 25 d (44

  4. Glacier changes since Local Last Glacial Maximum in the South-West slope of Nevado Hualcán, Cordillera Blanca, Peru, deduced from moraine mapping and GIS-based analysis

    Science.gov (United States)

    Giráldez, Claudia; Palacios, David; Haeberli, Wilfried; Úbeda, Jose; Schauwecker, Simone; Torres, Judith

    2014-05-01

    Anticipating and assessing hazards and risks associated with the shrinking of surface and subsurface ice in cold mountain chains is facilitated by empirical-quantitative data on present and past rates of change, as well as by a general understanding of related landforms and landscape evolution through time. Rock/ice avalanches and devastating outburst floods from glacial lakes indeed constitute a major cause of severe damage in populated mountain areas such as the Cordillera Blanca whose combination of tectonic, topographic and glaciological characteristics make it a threatened region. This study focuses on the Río Chucchún catchment above the city of Carhuaz, which was recently affected by a flood/debris flow from a rock/ice avalanche impacting a recently grown lake (Laguna 513). Traces left by past glaciations strongly affect the current geomorphodinamic behaviour of the catchment. For instance, a prominent sediment-filled glacial overdeepening behind Younger Dryas (YD) moraines (Pampa de Shonquil) with its retention function strongly influenced the chain of processes initiated by the outburst of Laguna 513. The aim of this study is to reconstruct earlier glacial phases in the SW slope of Nevado Hualcán (Río Chucchún catchment), in order to compile quantitative information on surface areas and Equilibrium Line Altitudes (ELAs). To do so, glacier stages were assigned to five different glacial phases, through photointerpretation and moraine cartography: 2003; 1962; Hualcán-I-LIA (15th to 18th centuries); Hualcán-II-YD (~12,5 ka BP); and Hualcán-III-LLGM (~34 to 21 ka BP). Glacial stages Hualcán-I-LIA, Hualcán-II-YD and Hualcán-III-LLGM present relative dating based on previous studies from different authors in the Peruvian Andes. Once glaciers were delimited, their surface areas and Equilibrium Line Altitudes (ELAs) were calculated. For ELA estimation three different methods were used: the mid-range elevation, the Accumulation Area Ratio (AAR), and the

  5. Bartolomé Leal, Blanca de Negro

    OpenAIRE

    Ponce, Néstor

    2016-01-01

    Esta nueva novela del escritor chileno Bartolomé Leal (1946) prosigue la saga policial del detective privado keniano Tim Tutts y de su grupo de colaboradores, Karima Waweru, Joe Ndege y la secretaria Curly Negatu. Tim Tuuts es el protagonista de Linchamiento de negro (1994) y de novelas cortas como El caso del rinoceronte deprimido, Muerte de un escritor y Un askari en mi patio (2009). Leal –tal un Emilio Salgari del siglo XXI- es reconocido por sus novelas y relatos negros que proponen el c...

  6. Polyphase white mica growth in low-grade metapelites from La Cébila Metamorphic Complex (Famatinian Belt, Argentina: evidence from microstructural and XRD investigations Crecimiento polifásico de mica blanca en metapelitas de bajo grado del Complejo Metamórfico La Cébila (Faja Famatiniana, Argentina: evidencias a partir de investigaciones microestructurales y de DRX

    Directory of Open Access Journals (Sweden)

    Sebastián O Verdecchia

    2011-07-01

    Full Text Available Two tectono-thermal metamorphic events, M1-D1 (S1, with associated white mica and chlorite: WM1-Chl1 and M2-D2 (S2, with development of WM2-Chl2, are established from polyphase white mica growth for low-grade units from the Ordovician metasedimentary successions of La Cébila Metamorphic Complex in the Famatinian belt (western-central Argentina. The thermobarometric characterization of the M1 main event was carried out by means of clay-mineral analysis and crystallo-chemical parameter measurements. Epizonal (temperatures between 300 and 400°C and low-pressure conditions are suggested for M1 event, based in Kübler index values ranging from 0.23 to 0.17 A°20, white mica b parameter values between 9.004 and 9.022 Á (mean of 9.014 Á, n=16 and Si contents between 3.13-3.29 a.p.f.u. Temperatures of ~180-270°C are estimated for the M2 event, with Kübler index values ranging from 0.31 to 0.46 A°20. The M1-D1 event of La Cébila could be linked to high-strain heating tectono-metamorphic Ordovician regime recorded in others complexes from Famatinian foreland region of Sierras Pampeanas.Dos eventos tectono-metamórficos fueron establecidos a partir de la blastesis superpuesta de mica blanca en sucesiones metasedimentarias ordovícicas de bajo grado del Complejo Metamórfico La Cébila, cinturón Famati-niano (centro oeste de Argentina: M1-D1 (S1, con blastesis asociada de mica blanca y clorita: WM1-Chl1 y M2-D2 (S2, con desarrollo de WM2-Chl2. La caracterización termobarométrica del evento principal M1 fue llevada a cabo a través del análisis de minerales de arcilla y de la medición de parámetros cristaloquímicos. Las condiciones de epizona con temperaturas entre 300 y 400°C, y baja presión fueron estimadas para el evento M1 sobre la base de valores de índice de Kübler de 0,23 a 0,17 A°20, parámetro b de la mica blanca entre 9,004 y 9,022 Á (valor medio de 9,014 Á, n=16 y contenidos de Si entre 3,13-3,29 a.p.f.u. Se estimaron

  7. Abundancia, tamaño y estructura poblacional del tiburón punta blanca de arrecife, Triaenodon obesus (Carcharhiniformes: Carcharhinidae, en Bahía Chatham, Parque Nacional Isla del Coco, Costa Rica Abundance, size and population structure of whitetip reef sharks, Triaenodon obesus (Carcharhiniformes: Carcharhinidae, in Bahía Chatham, Parque Nacional Isla del Coco, Costa Rica

    Directory of Open Access Journals (Sweden)

    Ilena Zanella

    2012-11-01

    Full Text Available Doce especies de tiburones habitan las aguas del Parque Nacional Isla del Coco (PNIC y uno de los más abundantes es el tiburón punta blanca de arrecife, Triaenodon obesus. El presente estudio determinó la abundancia, tallas y estructura de la población de esta especie en la zona de Bahía Chatham, PNIC. Se utilizó el método de marcaje y recaptura y se realizaron conteos subacuáticos visuales, con el fin de determinar su abundancia relativa y contabilizar recapturas visuales. Los tiburones punta blanca de Bahía Chatham no presentan segregación ontogénica espacial definida; pero si una alta fidelidad a los a sitios de residencia dentro de esta bahía. La longitud total promedio de los tiburones marcados fue de 101.8±12.1cm, con una longitud total máxima de 130.0cm y una mínima de 71.0cm. La mediana de las longitudes totales de los tiburones machos (103.5±21.33cm y hembras (100.1±11.2cm no difirieron significativamente (H = 1.78; p=0.1818. La abundancia relativa en Bahía Chatham, PNIC fue de 49.5±10.4 tiburones/h. El tamaño estimado de la población usando el método de de captura-recaptura fue de 408 (IC=181-1050.Approximately 12 species of shark inhabit at Coco Island National Park (PNIC; some are migratory, such as the hammerhead shark (Sphyrna lewini and whale shark (Rincodon typus, and others are resident, like the whitetip shark (Triaenodon obesus. The whitetip shark is a species related to coral reefs, it inhabits coastal environments and is nocturnal and, it is very common in tropical waters, but there are few studies worldwide. In fact, only short researches have been done about their behavior at PNIC. Therefore, this study aimed to give data about the abundance, size and population structure of the whitetip shark at Chatham Bay in Coco Island National Park, providing baseline information for monitoring its population which is also very vulnerable to climate change. In order to accomplish this aim, a mark-recapture method

  8. Evaluación del uso de los servicios in situ de las bibliotecas de barrio: un estudio a nivel nacional de usuarios de minorías étnicas y mayorías blancas de bajos ingresos usando instrumentos personales de recogida de datos

    Directory of Open Access Journals (Sweden)

    Christie M. Koontz

    2006-01-01

    Full Text Available La costumbre de presentar los datos totales sobre el uso de la biblioteca a nivel de todo un sistema bibliotecario (es decir, incluyendo tanto la biblioteca central como las sucursales puede enmascarar las necesidades de los grupos de usua-rios más específicos. Este artículo presenta un estudio que intenta resolver este problema identificando las bibliotecas que sirven a minorías étnicas o a mayorías de raza blanca con bajos ingresos y examinando estas poblaciones para evaluar tipos y niveles de uso. Este estudio es muy importante para la investigación y práctica diaria de las bibliotecas por estas razones: (1 incremento de la diversidad de razas/etnias y lenguas habladas en los Estados Unidos, (2 bajos índices de préstamo agravados por el uso de Internet, (3 la mera existencia de una biblioteca es vital para fomentar el uso por poblaciones sin una tradición bibliotecaria o hábito de lectura y (4 la reciente publicación de la Base de Datos Geográfica de las Bibliotecas Públicas con datos sobre el uso de las bibliotecas y del censo demográfico a nivel de barrios para todos los sistemas bibliotecarios estadou-nidenses. Las metodologías desarrolladas ofrecen posibilidades para la colección de datos importantes para el bibliotecario de hoy día

  9. Caracterización histórica y socioeconómica de una franja territorial yuquera en el distrito de La Fortuna, San Carlos y Peñas Blancas, San Ramón, región Huetar Norte de Costa Rica

    Directory of Open Access Journals (Sweden)

    Francisco Rodríguez-Barrientos

    2014-05-01

    Full Text Available El presente artículo se deriva del proyecto de investigación “Mejora en la eficiencia de la cadena productiva de la yuca en el distrito de La Fortuna, San Carlos, Costa Rica”. Su objetivo fundamental consistía en mejorar la eficiencia y la productividad en las diversas etapas del proceso agroproductivo de la yuca. La investigación se realizó en una franja territorial que abarcó un sector del distrito de La Fortuna, cantón de San Carlos, provincia de Alajuela, Costa Rica, tradicionalmente un importante lugar de producción yuquera, y otro del distrito de Peñas Blancas (cantón de San Ramón, provincia de Alajuela. Esa franja territorial es parte de la Región Huetar Norte costarricense y su sector ligado a la producción, procesamiento y comercialización de yuca constituyó la población meta de la investigación. El proyecto tuvo una duración de tres años (2006-2008. En este artículo se hace una caracterización histórica, social y económica de dicha franja territorial. Además, se analizan las consecuencias económicas y sociales, tanto para las comunidades ubicadas en la franja territorial estudiada como para la región de la que forman parte, derivadas de los cambios ocurridos en los ámbitos nacional e internacional, sobre todo en los últimos treinta años. De este modo, se intenta perfilar el alcance y la índole de las eventuales transformaciones acaecidas en la franja seleccionada, ubicando siempre el análisis en el contexto de la región Huetar Norte. Posteriormente se publicarán más artículos con los resultados obtenidos en las etapas agrícola, industrial (maquiladoras y empacadoras y social, destacando lo relacionado con la situación de los trabajadores en las empacadoras, haciendo énfasis en los migrantes nicaragüenses.

  10. Uso del escobajo como sustrato para el crecimiento de hongos de la pudrición blanca, la producción de enzimas ligninolíticas y la decoloración de tinturas Grape stalks as substrate for white rot fungi, lignocellulolytic enzyme production and dye decolorization

    Directory of Open Access Journals (Sweden)

    Laura Levin

    2012-06-01

    Full Text Available El objetivo de este trabajo fue evaluar el potencial del escobajo, un residuo agroindustrial, como sustrato para el crecimiento y la producción de enzimas lignocelulósicas de tres hongos causantes de pudrición blanca en la madera: Trametes trogii, Stereum hirsutum y Coriolus antarcticus. Para ello se utilizaron técnicas de fermentación en estado sólido. También se ensayó la decoloración de colorantes industriales sobre estos cultivos. La pérdida de peso seco del sustrato fue similar después del día 60 (33-43 %. C. antarcticus produjo las mayores actividades de lacasa y Mn-peroxidasa (33,0 y 1,6 U/g peso seco. La mayor actividad endoglucanasa fue medida en cultivos de S. hirsutum (10,4 U/g, y la mayor actividad endoxilanasa en T. trogii (14,6 U/g. El sistema C. antarcticus/escobap mostró un importante potencial para su aplicación en la biorremediación de efluentes textiles, con porcentajes de decoloración de 93, 86, 82, 82, 77 y 58 % para índigo carmín, verde de malaquita, azure B, azul R brillante de remazol, cristal violeta y xilidina, respectivamente, en 5 h.The aim of this work was to evaluate the potential of grape stalks, an agroindustrial waste, for growth and lignocellulolytic enzyme production via solid-state fermentation, using the following three white rot fungi: Trametes trogii, Stereum hirsutum and Coriolus antarcticus. The decolorization of several dyes by the above mentioned cultures was also investigated. Similar values of dry weight loss of the substrate were measured after 60 days (33-43 %. C. antarcticus produced the highest laccase and Mn-peroxldase activities (33.0 and 1.6 U/g dry solid. The maximum endoglucanase production was measured in S. hirsutum cultures (10.4 U/g, while the endoxylanase peak corresponded to T. trogii (14.6 U/g. The C. antarcticus/grape stalk system seems potentially competitive in bioremediation of textile processing effluents, attaining percentages of decolorization of 93, 86, 82, 82

  11. Digestibilidad aparente de ingredientes de origen vegetal y animal en la cachama

    Directory of Open Access Journals (Sweden)

    Wálter Vásquez-Torres

    2013-08-01

    Full Text Available El objetivo de esta investigación fue evaluar los coeficientes de digestibilidad aparente de materia seca (MS, proteína y energía de alimentos de origen animal y vegetal, utilizados en raciones para cachama (Piaractus brachypomus. Fueron formuladas 15 dietas experimentales, compuestas por 69,5% de una dieta referencia semipurificada, 0,5% de óxido de cromo y 30% del ingrediente a evaluar. En cada experimento, fueron utilizados 90 peces que se alimentaron durante cinco días con la correspondiente dieta; al quinto día, los animales fueron trasladados a tanques cónicos para recolección de heces. Los coeficientes de digestibilidad aparente (CDA de proteína variaron de 92,1 a 84,7% entre los ingredientes proteicos de origen vegetal, de 85,0 a 68,5% en los proteicos de origen animal, y de 83,7 a 57,6% entre los de origen vegetal con baja proteína. Los CDA de energía de torta de soya, gluten de maíz, harina de yuca integral y de todos los ingredientes de origen animal arrojaron valores superiores a 76%. Los máximos CDA de MS variaron entre 71 y 78% y fueron observados en gluten, harina de yuca y en los ingredientes de origen animal. La cachama tiene alta capacidad para aprovechar eficientemente ingredientes de origen animal y vegetal.

  12. El candombe (uruguayo en Buenos Aires: (Proponiendo Nuevos imaginarios urbanos en la ciudad "blanca" O candombe uruguaio em Buenos Aires: (Propondo Novos imaginários urbanos na cidade "branca " Uruguayan candombe in Buenos Aires: (Proposing New urban imaginaries in the "White" city

    Directory of Open Access Journals (Sweden)

    Alejandro Frigerio

    2009-12-01

    Full Text Available El trabajo se propone examinar la apropiación de espacios públicos y la generación de nuevos imaginarios y representaciones urbanas a través de prácticas culturales populares. Para ello nos focalizaremos en el desarrollo y expansión espacial del candombe (de origen uruguayo. La reterritorialización de esta práctica musical requiere en un primer momento de su anclaje en el casco histórico de la ciudad y de la apelación a la memoria de presencia negra en ese lugar. Tanto esta referencia como la posterior expansión de la práctica por otros barrios implican un trabajo de imaginación de la ciudad que discute la imagen dominante de Buenos Aires como blanca, moderna y europea. Al desafiar esta imagen, proponiendo un imaginario urbano alternativo, los candomberos entran en conflicto con distintos agentes y actores sociales.O trabalho analisa a apropriação de espaços públicos e a geração de novos imaginários e representações urbanas pela prática de expressões culturais populares, com énfase no desenvolvimento e a expansão espacial do candombe (de origem uruguaia. A reterritorialização desta prática musical requer em um primeiro momento de sua inclusão no casco histórico da cidade e no apelo à memória da presença negra na área. Nesta referência, e na posterior expansão da prática musical pelos outros bairros da cidade se faz um trabalho de imaginação da cidade que contesta à imagem dominante de Buenos Aires como branca, moderna e européia. Ao desafiar esta imagem, propondo um imaginário urbano alternativo, os candomberos entram em conflito com diferentes atores e agentes sociais.The paper examines the appropriation of public space and the proposal of new urban imaginaries by the practitioners of popular cultural practices. We focus on the development and spatial expansion of Afro-Uruguayan candombe in Buenos Aires. The reterritorialization of this musical practice requires at first embedding it in the historical

  13. Estimación de curvas de progreso de la incidencia de podredumbre blanca (Sclerotium cepivorum Berk. en cultivos de ajo mediante un modelo no lineal mixto Estimation of incidence progress curves of white rot (Sclerotium cepivorum Berk. in garlic crops using a nonlinear mixed model

    Directory of Open Access Journals (Sweden)

    M. Y. Conles

    2011-06-01

    Full Text Available En este trabajo se modela la curva de progreso de la podredumbre blanca en cultivos de ajo, mediante modelos no lineales mixtos que contemplan el efecto de factores concomitantes en el desarrollo de las epidemias. Entre 2001 y 2003 en Cruz del Eje y Jesús María, Argentina, se evaluaron la densidad inicial de esclerocios (DIE y la incidencia de la enfermedad quincenalmente hasta cosecha. Con DIE alta (>15 esclerocios/100 g de suelo la incidencia final fue alta (64-100% y con DIE baja (≤15 esclerocios/100 g de suelo varió entre 0-100%. El modelo logístico mixto seleccionado tuvo “interceptos” y pendientes aleatorias y diferentes para cada combinación de “ambiente” (localidad y año y categoría de DIE (altas y bajas. La representación de las curvas epidémicas se hizo mediante tres curvas específicas de sitio, la típica con efecto aleatorio cero, que expresa la forma general del modelo y las percentiles Q1 (0,25 y Q3 (0,75 que expresan la variabilidad. El 50% de las curvas tuvo pendientes entre r±0,67 v. La variabilidad de los “interceptos” y pendientes dependió solamente de la DIE, y fue menor en los “interceptos” con DIE “altas” que en aquellos con DIE “bajas”; en las pendientes se observó el efecto opuesto.This paper models the progress curve of white rot in garlic crops using nonlinear mixed models taking into account the effect of concomitant factors in the development of epidemics. Between 2001 and 2003 in Cruz del Eje and Jesus Maria, Argentina, the initial density of sclerotia (DIE and the incidence of the disease were evaluated every two weeks until harvest. With DIE high (>15 sclerotia/100 g of soil the final incidence was high (64-100%, while with DIE low (≤15 g soil sclerotia/100 the final incidence ranged from 0-100%. The mixed logistic model that was selected had random “intercepts” and rates which were different for each combination of “environment” (location and year and DIE category

  14. Inspección glaciar Paria, cordillera blanca

    OpenAIRE

    Instituto Nacional de Recursos Naturales. Intendencia de Recursos Hídricos. Unidad de Glaciología y Recursos Hídricos; Gómez López, Jesús; Tournoud, Matthieu

    2003-01-01

    Realiza la inspección del glaciar Paria, con el objetivo de encontrar lugares convenientes para la instalación de pluviómetros y obtener información de precipitaciones para correlacionar datos. Este glaciar esta ubicado en el distrito y provincia de Yungay, departamento de Ancash.

  15. Pena Blanca Natural Analogue Project: Summary of activities

    Energy Technology Data Exchange (ETDEWEB)

    Levy, S.; Goldstein, S.; Dobson, P.F.; Goodell, P.; Ku, T.-L.; Abdel-Fattah, A.; Saulnier, G.; Fayek, M.; de la Garza, R.

    2011-02-01

    The inactive Nopal I uranium mine in silicic tuff north of Chihuahua City, Chihuahua, Mexico, was studied as a natural analogue for an underground nuclear-waste repository in the unsaturated zone. Site stratigraphy was confirmed from new drill cores. Data from site studies include chemical and isotopic compositions of saturated- and unsaturated-zone waters. A partial geochronology of uranium enrichment and mineralization was established. Evidence pertinent to uranium-series transport in the soil zone and changing redox conditions was collected. The investigations contributed to preliminary, scoping-level performance assessment modeling.

  16. Pena blanca natural analogue project: summary of activities

    Energy Technology Data Exchange (ETDEWEB)

    Levy, Schon S [Los Alamos National Laboratory; Goldstein, Steven J [Los Alamos National Laboratory; Abdel - Fattah, Amr I [Los Alamos National Laboratory

    2010-12-08

    The inactive Nopal I uranium mine in silicic tuff north of Chihuahua City, Chihuahua, Mexico, was studied as a natural analogue for an underground nuclear-waste repository in the unsaturated zone. Site stratigraphy was confirmed from new drill core. Datafrom site studies include chemical and isotopic compositions of saturated- and unsaturated-zone waters. A partial geochronology of uranium enrichment and mineralization was established. Evidence pertinent to uranium-series transport in the soil zone and changing redox conditions was collected. The investigations contributed to preliminary, scoping-level performance assessment modeling.

  17. Pressão arterial de 24 horas em mulheres idosas normotensas e com hipertensão do avental branco Presión arterial de 24 horas en mujeres mayores normotensas y con hipertensión de la bata blanca 24-hour blood pressure in normotensive elderly women and elderly women with white-coat hypertension

    Directory of Open Access Journals (Sweden)

    Paulo Rogério W. Hekman

    2010-04-01

    Full Text Available FUNDAMENTO: Mudanças no comportamento do ritmo circadiano podem ser deletérias, levando à lesão de órgãos-alvo, o que sugere ser de importante significado prognóstico e, eventualmente, podem também demandar intervenção terapêutica. OBJETIVO: Descrever e comparar os ritmos circadianos de pressão arterial (PA entre mulheres idosas normotensas e portadoras de hipertensão do avental branco (HAB. MÉTODOS: Estudo transversal em uma amostra de 36 pacientes, com idades entre 60-83 anos, submetidas à monitorização ambulatorial de pressão arterial (MAPA durante 24 horas. Dezenove idosas normotensas e 17 com HAB foram comparadas quanto à queda noturna e variabilidade de PA, ascensão matinal da PAS, pressão de pulso, hipotensão pós-prandial e correlação de médias de PA de 24 horas. Na análise estatística, utilizou-se o teste t de Student, teste do qui-quadrado, teste exato de Fisher e teste de correlação linear de Pearson. RESULTADOS: As idosas com HAB apresentaram níveis mais elevados de PAS do que as normotensas, entre 8-12 horas (133 ± 8,0 mmHg vs 123 ± 9,0 mmHg, respectivamente, p FUNDAMENTO: Cambios en el comportamiento del ritmo circadiano pueden ser perjudiciales, conduciendo a la lesión de órganos blanco, lo que sugiere ser de importante significado pronóstico y, eventualmente, pueden también demandar intervención terapéutica. OBJETIVO: Describir y comparar los ritmos circadianos de presión arterial (PA entre mujeres mayores normotensas y portadoras de hipertensión de la bata blanca (HABB. MÉTODOS: Estudio transversal en una muestra de 36 pacientes, con edades entre 60-83 años, sometidas a monitoreo ambulatorio de presión arterial (MAPA durante 24 horas. 19 mujeres mayores normotensas y 17 con HABB fueron comparadas con relación a la caída nocturna y variabilidad de la PA, ascenso matinal de la PAS, presión de pulso, hipotensión postprandial y correlación de promedios de PA de 24 horas. En el an

  18. Disease resistance of pacu Piaractus mesopotamicus (Holmberg, 1887 fed with β-glucan

    Directory of Open Access Journals (Sweden)

    JD Biller-Takahashi

    Full Text Available Effects of β-glucan on innate immune responses and survival were studied in pacu experimentally infected with Aeromonas hydrophila. Fish fed diets containing 0, 0.1% and 1% β-glucan were injected with A. hydrophila. β-glucan enhanced fish survival in both treated groups (26.7% and 21.2% of the control, respectively. Leukocyte respiratory burst and alternative complement pathway activities were elevated after bacterial challenge regardless the β-glucan concentration. Lysozyme activity was higher after infection and showed a gradual increase as β-glucan concentration increased. A significant elevation in WBC count was observed either after bacterial challenge or by influence of β-glucan separately. The same response was observed in the number of thrombocytes, lymphocytes, eosinophils, LG-PAS positive cell and monocytes. It can be concluded that feeding pacu with β-glucan can increase protection against A. hydrophila, due to changes in non-specific immune responses.

  19. Leukocytes respiratory burst activity as indicator of innate immunity of pacu Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    JD Biller-Takahashi

    Full Text Available The present study evaluated the assay to quantify the respiratory burst activity of blood leukocytes of pacu as an indicator of the innate immune system, using the reduction of nitroblue tetrazolium (NBT to formazan as a measure of the production of reactive oxygen species (ROS. In order to assess the accuracy of the assay, fish were challenged by Aeromonas hydrophila and sampled one week after challenge. The A. hydrophila infection increased the leukocyte respiratory burst activity. The protocol showed a reliable and easy assay, appropriate to determine the respiratory burst activity of blood leukocytes of pacu, a neotropical fish, in the present experimental conditions.

  20. Expression of cellular components in granulomatous inflammatory response in Piaractus mesopotamicus model.

    Directory of Open Access Journals (Sweden)

    Wilson Gómez Manrique

    Full Text Available The present study aimed to describe and characterize the cellular components during the evolution of chronic granulomatous inflammation in the teleost fish pacus (P. mesopotamicus induced by Bacillus Calmette-Guerin (BCG, using S-100, iNOS and cytokeratin antibodies. 50 fish (120±5.0 g were anesthetized and 45 inoculated with 20 μL (40 mg/mL (2.0 x 10(6 CFU/mg and five inoculated with saline (0,65% into muscle tissue in the laterodorsal region. To evaluate the inflammatory process, nine fish inoculated with BCG and one control were sampled in five periods: 3rd, 7th, 14th, 21st and 33rd days post-inoculation (DPI. Immunohistochemical examination showed that the marking with anti-S-100 protein and anti-iNOS antibodies was weak, with a diffuse pattern, between the third and seventh DPI. From the 14th to the 33rd day, the marking became stronger and marked the cytoplasm of the macrophages. Positivity for cytokeratin was initially observed in the 14th DPI, and the stronger immunostaining in the 33rd day, period in which the epithelioid cells were more evident and the granuloma was fully formed. Also after the 14th day, a certain degree of cellular organization was observed, due to the arrangement of the macrophages around the inoculated material, with little evidence of edema. The arrangement of the macrophages around the inoculum, the fibroblasts, the lymphocytes and, in most cases, the presence of melanomacrophages formed the granuloma and kept the inoculum isolated in the 33rd DPI. The present study suggested that the granulomatous experimental model using teleost fish P. mesopotamicus presented a similar response to those observed in mammals, confirming its importance for studies of chronic inflammatory reaction.

  1. Enhancement of superoxide dismutase and catalase activity in juvenile brown shrimp, Farfantepenaeus californiensis (Holmes, 1900, fed β-1.3 glucan vitamin E, and β-carotene and infected with white spot syndrome virus Incremento de la actividad superóxido dismutasa y catalasa en juveniles de camarón café Farfantepenaeus californiensis (Holmes, 1900 alimentados con β-1,3 glucano vitamina E y β-caroteno e infectados con el virus de la mancha blanca

    Directory of Open Access Journals (Sweden)

    Rosario Pacheco

    2011-11-01

    Full Text Available The effect of dietary β-Ο-glucan, vitamin E, and β-carotene supplements in juvenile brown shrimp, Farfantepenaeus californiensis, inoculated with white spot syndrome virus (WSSV was evaluated. Groups of 30 organisms (weighing 1 ± 0.5 g were cultured in 60 L fiberglass tanks and fed daily with β-1.3-glucan (0.1%, vitamin E (0.01%, and β-carotene (0.01% for 23 days; the specimens were then inoculated with WSSV. The antioxidant activity of the enzymes superoxide dismutase (SOD and catalase (CAT were determined in the hepatopancreas and muscle at 0, 1, 6, 12, 24, and 48 h after inoculation. Shrimp fed with β-1.3-glucan, vitamin E, and β-carotene significantly increased SOD activity in the hepatopancreas and muscle at 12 and 24 h post-infection, respectively. Shrimp fed with vitamin E and β-1.3-glucan registered an increment in SOD activity from 12 to 48 h post-infection. Shrimp fed with β-carotene increased SOD activity before infection with WSSV, and shrimp fed with β-1.3-glucan and vitamin E increased CAT activity, also before infection. The CAT activity response in shrimp muscle increased with respect to the control group for all treatments tested from 1 to 6 h after inoculation with WSSV. The highest antioxidant response was registered in shrimp fed with vitamin E. Juvenile shrimp fed with vitamin E and later inoculated with WSSV registered 100% mortality at 72 h, but shrimp fed with β-Ο-glucan and β-carotene showed greater resistance to WSSV, with mortality at 144 h post-infection. This study demonstrated the capacity of juvenile Farfantepenaeus californiensis fed β-Ο-glucan, vitamin E, or β-carotene to increase the antioxidant response before and after viral infection.Se evaluó el efecto de β-1,3-glucano, vitamina E y β-caroteno en la dieta de juveniles de camarón café Farfantepenaeus californiensis inoculados con virus del síndrome de la mancha blanca (WSSV. Se colocaron grupos de 30 camarones (peso 1 ± 0,5 g en

  2. EFECTO DE LA TEMPERATURA Y VELOCIDAD DE LA LÍNEA DE COLGADO, EN EL PORCENTAJE DE PLUMA Y DESPIGMENTACIÓN DE AVES BLANCA Y CAMPESINA, DURANTE EL PROCESO DE ESCALDADO EFEITO DA TEMPERATURA E LINHA DE VELOCIDADE DE SUSPENSÃO DO PERCENTUAL DE PENA DE AVES E BRANCAS DESPIGMENTAÇÃO CAMPONESES DURANTE O PROCESSO ESCALDAGEM EFFECT OF TEMPERATURE AND SPEED OF THE HANGING LINE ON THE PERCENTAGE OF FEATHER AND DEPIGMENTATION OF WHITE AND PEN CHICKENS, DURING THE SCALDING PROCESS

    Directory of Open Access Journals (Sweden)

    DEYANIRA MUÑOZ M

    2011-06-01

    Full Text Available En este trabajo se reporta el efecto de la temperatura y velocidad de la línea de colgado, en el porcentaje de pluma y despigmentación de aves blanca y campesina, durante el proceso de escaldado. Los valores de operación de temperatura de escaldado y velocidad encontrados y acordes a los estándares de calidad reglamentados por el INVIMA, fueron para pollo blanco temperatura entre 54 a 58°C y velocidades de 110 a 130 unidades por minuto, mientras en campesino se obtuvieron temperaturas de 51 a 53°C y velocidad de 90 unidades por minuto. En estas condiciones en ambos tipos de pollo se generan menos del 10% de pluma, 1% de grados de sobre-escaldado y porcentajes de despigmentación inferiores al 26%.Este trabalho tem como objetivo estudar o efeito da temperatura e da velocidade da linha de suspensão, na percentagem de penas e despigmentação de aves brancas e camponesas, durante o procedimento de escaldado. Os resultados da temperatura de escaldado e da velocidade obtidos foram consistentes com os padrões de qualidade estabelecidos pelo INVIMA. A temperatura para o frango "branco" foi de 54-58°C e a velocidade de 110 a 130 unidades por minuto, enquanto que a temperatura para o frango "camponês" foi de 51 a 53°C e a velocidade de 90 unidades por minuto. Sob estas condições em ambos tipos de carne de frango são obtidos valores inferiores a 10 de penas, 1% de graus de sobre-escaldado e percentagens de despigmentação menores a 26%.This research aims at analyzing the effect of temperature and speed of the hanging line on the percentage of feather and depigmentation of white and pen chickens during the scalding process. The operation values of scalding temperature of and speed in accordance with the standards of quality stipulated by INVIMA, were 54 to 58°C and 110 to 130 units per minute for white chickens, and 51 to 53°C and 90 units per minute for pen chicken. Under these conditions, less than of 10% of feather, 1% of over scalding

  3. Fatores antinutricionais e coeficientes de digestibilidade aparente da proteína de produtos de soja para o pacu (Piaractus mesopotamicus = Anti-nutritional factors and protein apparent digestibility coefficients of soybeans sources to pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Marcia Regina Stech

    2010-07-01

    Full Text Available Este estudo teve como objetivo determinar as atividades dos inibidores de tripsina, hemaglutinante e teores de taninos no farelo de soja e na soja crua e processada, e avaliar o coeficiente de digestibilidade aparente da fração proteica para juvenis de pacu. Oscoeficientes de digestibilidade aparente da proteína da soja crua, extrusada, tostada e macerada foram determinadas usando óxido de cromo (0,5% como marcador. Foi elaborada dieta de referência com 26% de proteína bruta e 4.352 kcal kg-1, e a cada alimento avaliado foram substituídas 30% da dieta-teste. As fezes foram coletadas por pressãoabdominal. Todos os produtos analisados apresentaram fatores antinutricionais, mas foi observada menor atividade de inibidor de tripsina no farelo de soja. Sojas que receberam tratamento térmico apresentaram os melhores coeficientes de digestibilidade e menoresvalores de atividade hemaglutinante do que a soja crua. Não foram observados efeitos dos inibidores de tripsina e taninos sobre o coeficiente de digestibilidade da proteína, mas foi observada relação negativa entre os teores de hemaglutinina com a digestibilidade daproteína bruta. Para a alimentação do pacu recomenda-se a utilização do farelo de soja e da soja processada por extrusão ou tostada.This study aimed to determine the activities of trypsin inhibitors, hemagglutinant and tannin levels in soybean meal and in raw andprocessed soy, as well evaluate the protein apparent digestibility coefficient for pacu juveniles. The apparent coefficients of raw, extruded, toasted and milled soy were determined using chromium oxide (0.5% as marker. A reference diet was created with 26% crude protein and 4,352 kcal kg-1, with each feed containing 30% of the test diet. Feces were collected by abdominal pressure. All analyzed products presented anti-nutritional factors, but the lowest trypsin inhibitoractivity was observed in soybean meal. Soy that received thermal treatment presented better digestibility coefficients and lower hemagglutinating activity values than raw soy. No effects of trypsin and tannin inhibitor were observed on the protein digestibility coefficient, but a negative relationship was observed between hemagglutinin levels and protein digestibility coefficient. Theuse of soybean meal and extruded or toasted soy is recommended for pacu feeding.

  4. Eficácia do fembendazole no controle de nematódeos de pacu Piaractus mesopotamicus (Holmberg, 1987 The efficiency of fembendazole in the control of nematodes in pacu Piaractus mesopotamicus (Holmberg, 1987

    Directory of Open Access Journals (Sweden)

    Jorge Erick Garcia Parra

    1997-06-01

    Full Text Available O presente trabalho foi realizado no Centro de Pesquisa e Treinamento em Aquicultura (CEPTA/1BAMA, município de Pirassununga, SP. Foram utilizados 60 pacus, dos viveiros da Estação de Piscicultura do CEPTA, com peso médio de 600g. Foi realizado um teste visando avaliar o efeito do Femben-dazote (adicionado no alimento em diferentes dosagens, sobre os nematódeos presentes no tubo intestinal do pacu, utilizando três tratamentos: Tl - grupo testemunha (ração sem Fembendazole, T2 - 20mg de Fembendazole/kg de ração e T3 - 40mg de Fembendazo-le/kg de ração. O delineamento foi inteiramente casualizado. A unidade experimental foi o peixe. Não houve diferença significativa (P 0,05 entre os tratamentos com anti-helmintico Fembendazole nas dosagens de 20mg/kg e 40/ng/kg de ração e o grupo testemunha.This study was done at lhe Agricultural Centre for Training and Research (CEPTA/IBAMA m the municipality of Pirassununga, São Paulo. Sixty pacus, wilh an average weight of 600g were obtained from the nurseries of the fish statíon at CEPTA. An experiment to determine the ejfect of fenbendazole (added to the ration in varíous doses on nematodes in the alimentary canal ofthe pacu was realized using three treatments. Tl - contrai group (ration without fenbendazole, T2 - 20mg fenbendazole/kg ration, and T3 - 40mgfenbendazole/kg ration. The experimental ouüine was totally random. The fish was the experimental unit. There was no significam dijference (P 0.05 befween the treatments wilh the anti-helminthic fenbendazole added to the ration in doses of 20 and 40 mg/kg and the contrai group.

  5. Efeito do ambiente pós-transporte na recuperação dos indicadores de estresse de pacus juvenis, Piaractus mesopotamicus = Effect of post-transport environment on the stress indicators recovery of pacu juveniles , Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Leonardo Susumu Takahashi

    2006-10-01

    Full Text Available O objetivo deste trabalho foi avaliar a recuperação das respostas fisiológicas de estresse após transporte de pacus em diferentes condições de es tocagem. Após transporte por 2h30min, os peixes foram transferidos para tanque de terra ou para caixas de polietileno em laboratório. Houve significativa redução dos valores de cortisol observados na chegada 24 horas depois, nas duas condições de estocagem , enquanto a concentração de glicose caiu significativamente 72 horas depois nos peixes estocados no tanque de t 1erra e 120 horas nos peixes estocados no laboratório. A osmolalidade, sódio, potássio e cloreto suger em um retorno à homeostase durante o perío do de recuperação, principalmente nos peixes no tanque de terra. Os parâmetros hematológicos, sem efeito da condição de estocagem, não se caracterizaram indicadores sensíveis. Após o transporte, uma prática de manejo que causa estresse em peixes, o retorno às condições normais foi favorecido quando os pacus foram estocados em tanque de terra.The aim of this work was to evaluate the recovery of physiological stress responses after the transport of pacu juveniles in different stocking conditions. After being transported for 2 h30min, fish were transferred to earthen ponds or indoor polyethylene boxes. There was a significant reduction of cortisol values registered at fish arrival , 24 hours after, in both stocking conditions . The glucose concentration reduced significantly 72 hours after in fish stocked in earthen ponds , and 120 hours in fish stocked indoor. Osmolality, sodium, potassium and chloride behavior suggested the re-establishment of the homeostasis during the recovery period, mainly in fish kept in the earthen ponds. Concerning the hematological parameters, only hemoglobin concentration reduced significantly in the recovery period , without effect of stockingcondition, which does not characterize feasible indicators. After transport, a management procedure that causes stress in fish, the recovery of the basal condition was fa vored when pacu were stocked in earthen ponds.

  6. Stress responses in juvenile pacu (Piaractus mesopotamicus submitted to repeated air exposure = Respostas de estresse em juvenis de pacu (Piaractus mesopotamicus submetidos à exposição aérea repetitiva

    Directory of Open Access Journals (Sweden)

    Jaqueline Dalbello Biller

    2008-01-01

    Full Text Available Pacu juveniles (5.2 ± 1.5 g were submitted to two one-minute air exposures in a 24h interval, and sampled before the exposure (control and 5, 15, 30 and 60 min., 24 and 48h afterwards for whole-body cortisol, sodium, potassium and calcium ion concentrations. For the first air exposure, there was a trend of increased cortisol concentration after 15 min., whereas in the second air exposure, the cortisol concentration increased significantly within 5 min. after stress was induced. Sodium ion concentrationincreased significantly 24h after both air exposures. Potassium concentration presented fluctuations over the experimental period. Calcium ion concentration increased progressively from 5 to 30 min., in both air exposures. The repeated air exposures exacerbated the cortisol response, but they did not affect the recovery ability of pacu over the experimental period. Additionally, the whole-body cortisol measurement might be a reliable indicator of stress, when sampled fish are smaller and blood volumes are very low, making samples inadequate for analysis.Juvenis de pacu (5,2 ± 1,5 g foram submetidos a duas exposições aéreas de um minuto, em intervalo de 24 horas, e amostradosantes da exposição (controle e 5, 15, 30 e 60 min., 24 e 48 horas depois para análise da concentração corporal de cortisol e dos íons sódio, potássio e cálcio. Na primeira exposição, os peixes apresentaram concentrações de cortisol aumentadas a partir de 15 min., embora não diferissem estatisticamente do controle. Na segunda exposição, a concentração de cortisol aumentou significativamente aos 5 min., retornando às concentrações equivalentes às dos peixes-controle em 30 min.. A concentração do íon sódio aumentousignificativamente 24 horas depois das duas exposições aéreas. A concentração do íon potássio apresentou flutuações durante o experimento, enquanto a do cálcio apresentou-se reduzida aos 5 min, aumentando gradativamente até os 30 min., nas duas exposições. Arepetição do fenômeno estressor exacerbou a liberação de cortisol, mas não afetou a capacidade de recuperação dos peixes. A análise do cortisol tecidual pode ser considerada um indicador confiável de estresse.

  7. PHYSIOLOGICAL RESPONSES OF PACU (Piaractus mesopotamicus, FED CASSAVA (Manihot esculenta FOLIAGE IN DIETS RESPOSTAS FISIOLÓGICAS DO PACU (Piaractus mesopotamicus, ALIMENTADO COM RAMA DE MANDIOCA (Manihot esculenta NA RAÇÃO

    Directory of Open Access Journals (Sweden)

    João Teodoro Padua

    2009-07-01

    Full Text Available Brazil is the largest world producer of cassava. Leafs and stem of cassava can be a alternative source of protein for omnivorous fish. However, the potential use is limited by the presence of high level of cyanide acid. The present study evaluated physiological responses of juvenile pacu submitted to increasing levels of the final third of the cassava foliage meal in diets. A completely randomized design was used in factorial scheme 4x2, four levels, 0, 12, 24 and 36 % of cassava foliage meal (CFM, and 2 levels of crude protein (CP, 24 % and 30 %, with three replicates. Three hundred twelve fish (55.33±6.19 g were distributed into 24 ponds of 13 m2. Results indicated that the levels of CFM inclusion affected the hemoglobin values (P<0.01, as well as the CP level (P<0.05, with interaction of these factors (P<0.01. Significant interaction among the CFM levels and CP was also observed for hematocrit, plasma protein (P<0.01 and plasma lipid (P<0.05. In the 24 % CP level was observed higher values of Hb in control and 36 % of CFM (3.51 g/dl and 3.25 g/dl respectively while with 30 % CP the control diet and 36 % CFM presented the smallest values (3.29 g/dl and 2.78 g/dl respectively. The higher level of CFM tested, inside of any protein level, had low influence on the pacu metabolism.

    KEY WORDS: Cassava leaf and stem fish metabolism, pacu, P. Mesopotamicus.
    O Brasil é o maior produtor mundial de mandioca, disponibilizando a rama de mandioca como fonte alternativa na alimentação de peixes onívoros. No entanto, o potencial de uso da rama é limitado pela toxidez do ácido cianídrico. Objetivou-se avaliar a resposta fisiológica do pacu alimentado com níveis crescentes da rama de mandioca. Utilizou-se delineamento inteiramente casualizado, em fatorial 4x2, quatro níveis de rama de mandioca (RM (0%, 12%, 24% e 36% e dois níveis de proteína bruta (PB (24% e 30% com três repetições. Trezentos e doze peixes (55,33±6,19 g foram distribuídos em 24 viveiros de 13 m2 cada. A RM influenciou a taxa de hemoglobina (P<0,01. Ocorreu interação entre RM e PB para as variáveis hemoglobina, hematócrito, proteína plasmática (P<0,01 e lipídio plasmático (P<0,05. Com 24% de PB foi observado maior valor de Hb nos tratamentos controle (3,51 g/dl e 36 % de RM (3,25 g/dl, enquanto que, com 30 % de PB, os tratamentos controle e 36 % de RM apresentaram os menores valores, 3,29 g/dl e 2,78 g/dl, respectivamente. Comportamento semelhante foi observado no Ht. As alterações metabólicas observadas evidenciaram que a utilização de até 36% do terço final da RM processado é uma alternativa na alimentação do pacu em crescimento.

    PALAVRAS-CHAVES: Metabolismo de peixe, pacu, P. mesopotamicus, rama de mandioca.

  8. Proposed method for agglutinating antibody titer analysis and its use as indicator of acquired immunity in pacu, Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    JD Biller-Takahashi

    Full Text Available Antibody can be assessed by agglutinating antibody titer which is a quantitative measure of circulating antibodies in serum from fish previously immunized. The antibody evaluation has been performed with different fish species, and is considered a reliable method that can be applied to confirm several hypothesis regarding acquired immunity, even in conjunction with precise methods to describe immune mechanisms. In order to provide appropriate analytical methods for future studies on the specific immune system of native fish, the present study standardized on assay to measure the serum agglutinating antibody titer produced after immunization with inactivated A. hydrophila and levamisole administration in pacu. It was possible to determine the agglutinating antibodies titer in a satisfactorily way in pacu immunized with inactive A. hydrophila, and the highest titers were observed on fish fed with levamisole.

  9. Lipoic acid and ascorbic acid affect plasma free amino acids selectively in the teleost fish pacu (Piaractus mesopotamicus).

    Science.gov (United States)

    Terjesen, Bendik F; Park, Kwan; Tesser, Marcelo B; Portella, Maria C; Zhang, Yongfang; Dabrowski, Konrad

    2004-11-01

    Most studies on the antioxidants, lipoic acid (LA) and ascorbic acid (AA), focused on species that, unlike teleost fish, are not scurvy-prone, and are able to synthesize AA. The antioxidant properties of LA may make it useful in aquaculture nutrition, but several effects must first be investigated, and we address here plasma free amino acids (FAA). In mammals, LA and AA in high doses were claimed to alter plasma FAA profile; to our knowledge, however, no data are available in fish. We therefore studied the effects of dietary LA and AA on plasma FAA in the South American teleost fish pacu, which is being used increasingly in aquaculture. LA treatment decreased concentrations of 18 of 23 individual FAA; specifically, dispensable and total FAA were significantly affected. Ornithine was elevated (+26%) in LA-treated fish and significantly decreased ratios of plasma [Arg]/[Orn] and other individual [FAA]/[Orn] were observed. LA and AA both affected sulfur FAA concentrations. Plasma cystine levels were significantly increased in the LA-supplemented groups. AA had little effect on most amino acids, and no interaction with LA was detected. AA supplementation did, however, significantly lower taurine (-42%) and cystathionine (-31%) levels in plasma. No effect on the branched chain:aromatic amino acid ratios was observed. The data indicate that at the dietary level studied, LA and AA independently affect selected plasma FAA in pacu, and suggest that any use of LA in particular as a dietary supplement should take into account an altered plasma FAA profile.

  10. Fontes e níveis de proteína bruta em dietas para alevinos de pacu (Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Fernandes João Batista Kochenborger

    2000-01-01

    Full Text Available Foi conduzido um experimento, com 100 dias duração, utilizando-se 288 alevinos de pacu, distribuídos em 36 caixas de cimento amianto com volume de 100 litros, para avaliar a substituição da farinha de peixe por farelo de soja e os níveis protéicos nas dietas. Durante o período experimental, a temperatura média da água permaneceu em 28ºC e os demais parâmetros limnológicos (oxigênio dissolvido, pH, alcalinidade e condutividade apresentaram-se dentro dos níveis adequados para o desenvolvimento desta espécie. O delineamento experimental foi de blocos casualizados, em que foram avaliados nove tratamentos em esquema fatorial 3 x 3, três níveis de proteína bruta (22, 26 e 30% e três níveis de substituição da farinha de peixe pelo farelo de soja (0, 50 e 100%. O nível de 26% de proteína bruta foi mais adequado. A farinha de peixe pode ser substituída parcial ou totalmente pelo farelo de soja, sem influir no ganho de peso, na conversão alimentar, na taxa de crescimento específico e na taxa de eficiência protéica dos alevinos. A substituição das fontes protéicas também não influenciou a composição corporal dos peixes, a eficiência de retenção de nitrogênio, o nitrogênio corporal, a gordura corporal e o nitrogênio e a gordura no ganho de peso.

  11. Characterization of the acute inflammatory response in the hybrid tambacu (Piaractus mesopotamicus male x Colossoma macropomum female) (Osteichthyes).

    Science.gov (United States)

    Martins, M L; Myiazaki, D M Y; Tavares-Dias, M; Fenerick, J; Onaka, E M; Bozzo, F R; Fujimoto, R Y; Moraes, F R

    2009-08-01

    This work evaluated the acute inflammatory response induced by injections of 0.5 mL saline solution (control), 500 microg carrageenin and 0.5 mL thioglycollate 3% in the swim bladder of juvenile tambacu hybrid. Fish were distributed in three treatments, three replications and acclimated for a period of 10 days before assay. The cell characterization from the inflammatory exudate was performed in Giemsa and PAS stained smears. Carrageenin, injected in fish, showed an increase on the total number of cells in the inflammatory exudate when compared to saline and thioglycollate injected. Whereas, for carrageenin-injected fish, the percentage of thrombocyte was higher than thioglycollate. On the other hand, granulocyte percentage in thioglycollate-injected fish was higher than the ones injected using carrageenin. Carrageenin provoked the highest migration of macrophage to the inflammatory site. The PAS method confirmed the presence of three types of granulocytes: eosinophilic granular cell (EGC) type 1 with the characteristics of a special granulocytic cell commonly found in the circulating blood; EGC type 2 shorter than the last one and neutrophil. This study contributes to a better understanding of the inflammatory response and infectious processes in native fish.

  12. La producción de armas blancas en Bilbao durante el siglo XVI

    Directory of Open Access Journals (Sweden)

    Dueñas Beraiz, Germán

    2001-12-01

    Full Text Available They are few notices published about swords manufacture in Spain during the 16th century. One of the most unknown productions centers is the city of Bilbao, wich developed an important production of arms in part destined to its export to the British Islands. This article studies some documents, it is specialy interesting an unpublished document about the litigation hold up in 1569 between Bilbao swordsmiths and the «Corregidor» from Bilbao. Thanks of them it has been posible to compile names, marks and information about the activity of this craftsmen.

    Son escasas las noticias que poseemos sobre las zonas donde se fabricaban espadas en España. Uno de los centros más desconocidos es el de la ciudad de Bilbao, que desarrolló durante todo el siglo XVI, una importante producción de armas en parte destinadas a su exportación a las Islas Británicas. Gracias a una serie de documentos, entre los que figura uno inédito que recoge el pleito que los espaderos de Bilbao mantuvieron en 1569 con el Corregidor de Vizcaya, se han podido recoger algunos nombres y datos que permiten conocer más sobre la actividad de estos artesanos.

  13. Estructura de "Torres Blancas". Informes de la Construcción N° 226, 1970

    Directory of Open Access Journals (Sweden)

    Sáenz de Oiza, F.

    1998-10-01

    Full Text Available Not available

    En el artículo se describen los problemas estructurales de un edificio de viviendas, en general, analizando las condiciones de trabajo y el proceso de cálculo de esta estructura singular, para lo que se estudia separadamente la organización vertical y la horizontal. La primera está constituida por 46 pantallas resistentes —de formas diversas y espesores entre 15 y 20 cm— con plegamientos en los bordes, gracias a los cuales se logra, entre otras ventajas, reducir las tracciones horizontales y aumentar el coeficiente de seguridad al pandeo. La organización horizontal adoptada ha sido la de losas de espesores constantes —de 20 cm, con refuerzos de capiteles en las grandes zonas de terrazas— que valoran por igual cualquier dirección de flexión. Se detallan, por separado, las estructuras fundamental, del núcleo social superior, y de la zona inferior, donde existen cuatro partes importantes: muros, aparcamiento, pérgola y cimentación.

  14. Three-Dimensional Model Test Study of the New Breakwaters at Playa Blanca, Lanzarote

    DEFF Research Database (Denmark)

    Andersen, Thomas Lykke; Garborg, Karsten; Stagsted, Esben Rubech

    This report present the results of 3-D physical model tests (length scale 1:42.5) carried out in a wave bassin at Department of Civil Engineering, Aalborg University (AAU) on behalf of SENER Ingenera y Sistemas S.A. Associate Prof. Thomas Lykke Andersen was in charge of the model tests, assisted...... by B.Sc. Karsten Garborg and B.Sc. Esben Rubeck Stagsted. Engineer assistant Niels Drustrup and Leif Mortensen assisted in the laboratory with the construction and instrumentation of the model. The model construction, testing and reporting were performed during August and September 2012. For further...

  15. Análisis histórico y prospectiva del humedal Tierra Blanca.

    Directory of Open Access Journals (Sweden)

    Deivy Cristhian Ruiz Sepúlveda

    2015-03-01

    originado en los últimos 30 años por la falta de un adecuado ordenamiento territorial y la poca apropiación que tiene la comunidad sobre el espacio. Este artículo analiza los factores que han incidido en su proceso de deterioro, reflexiona sobre la forma en que el humedal fue llevado a su actual estado y propone alternativas de recuperación del área.

  16. Grabado a la testa : línea blanca, línea negra

    Directory of Open Access Journals (Sweden)

    María Dolores Bastida de la Calle

    1991-01-01

    Full Text Available El florecimiento de la publicación ilustrada de gran tirada en el siglo XIX está directamente relacionado, como es bien sabido, con el revival xilográfico del grabado a la testa. La calcografía, por ejemplo, no permitía la impresión simultánea, y en consecuencia barata, de texto e imagen. En un bajo relieve calcográfico la tinta va alojada en surcos e incisiones que localizan las líneas negras al imprimir la estampa. El principal obstáculo a una estampación conjunta con la tipografía de alto relieve radica en que las presiones requeridas para una y otra matrices son muy diferentes: en el bajo relieve es necesaria una presión mucho mayor con objeto de forzar al papel, previamente humedecido, a absorber la tinta alojada en las incisiones. Por otra parte, en el caso de publicaciones periódicas las prensas de reproducción calcográfica (y litográfica resultaban muy lentas; todavía mediado el siglo no se podían obtener más de 200 ó 300 copias en un día.

  17. Geomorphology and natural hazards of the selected glacial valleys, Cordillera Blanca, Peru

    Czech Academy of Sciences Publication Activity Database

    Klimeš, Jan

    2012-01-01

    Roč. 47, č. 2 (2012), s. 25-31 ISSN 0300-5402 R&D Projects: GA ČR(CZ) GAP209/11/1000 Institutional research plan: CEZ:AV0Z30460519 Keywords : geomorphologic map * natural hazards * glacial lakes Subject RIV: DE - Earth Magnetism, Geodesy, Geography http://web.natur.cuni.cz/ksgrrsek/acta/2012/Geographica_2_2012_Klimes.pdf

  18. Recent evolution and degradation of the bent Jatunraju glacier (Cordillera Blanca, Peru)

    Czech Academy of Sciences Publication Activity Database

    Emmer, A.; Loarte, E.C.; Klimeš, Jan; Vilímek, V.

    2015-01-01

    Roč. 228, JAN 1 (2015), s. 345-355 ISSN 0169-555X R&D Projects: GA ČR(CZ) GAP209/11/1000 Institutional support: RVO:67985891 Keywords : debris-covered glacier * rock glacier * surface movements * buried ice degradation * supraglacial lakes Subject RIV: DE - Earth Magnetism, Geodesy, Geography Impact factor: 2.813, year: 2015

  19. Managing glacier related risks in the Chucchún Catchment, Cordillera Blanca, Peru

    Science.gov (United States)

    Muñoz, Randy; Gonzáles, César; Price, Karen; Frey, Holger; Huggel, Christian; Cochachin, Alejo; García, Javier; Mesa, Luis

    2015-04-01

    On April 11 2010, the city of Carhuaz and settlements in the Chucchún Catchment (Ancash region, Peru) suffered the impact of a glacier lake outburst flood. An avalanche of rock and ice from the Mount Hualcán hit the glacier lake 513, triggering a glacial lake outburst flood (GLOF) of 1 million m3 which destroyed farmland and several infrastructures. Although there was no loss of human life, the event caused panic in the population. In consequence, the Municipality of Carhuaz prioritized GLOF-related risk management. The Glacier Project, funded by Swiss Agency for Development and Cooperation, and executed by CARE Peru and the University of Zurich, fosters the coordination among public institutions (Glaciological Unit of the National Water Authority, the Ministry of Environment and Municipality) and the population for risk management. In this contribution we present all components of the risk management strategy as well as the lessons learned during the implementation. Risk management involves managing both glacier hazard as well as the vulnerability of the population. In this framework a glaciological and geomorphological characterization of Mount Hualcán and lake 513 was perfomed in order to model past and potential future outburst floods and to assess the slope stability conditions. Based on three potential GLOF scenarios of different magnitudes, a hazard map was produced for the entire catchment, which served as the basis for the vulnerability and risk assessment as well as for the design and the implementation of an Early Warning System (EWS), including evacuation planning. The EWS consists of 4 components: 1) knowledge of risk, through hazard and vulnerability characterization; 2) monitoring and alert, through the installation of monitoring stations on lake 513 for detecting avalanches with geophones and cameras; 3) broadcasting and communications, through the implementation of communication protocols between the Municipality of Carhuaz and emergency institutions (police, health centers and schools) and also authorities at higher coordination levels (Regional Government and the National Emergency Operations Center) enabling rapid emergency care; and 4) Responsiveness, through strengthening and training of public and private institutions and local leaders that make up the Civil Defense Platforms, the development of Emergency Operations Plan, and continuous organization of simulations for the population. As result, the population is aware of the risks they face and knok how to respond in case of a lake outburst event. In addition, the results generated during studies related to the risk analysis are used for land management of the Municipality of Carhuaz. The successful implementation of this risk management strategy was only possible by combining comprehensively scientific and local knowledge. This EWS represents a pilot experience in Peru and the Andes, and contributes to relatively scarce international experience with GLOF EWS. An important lesson is that these processes require active leadership of local authorities and continuous learning by the population. The mere existence of technology does not ensure the success of the risk reduction measures; this can only be attained by the internalization of processes and by taking responsibility against the existing hazard by each resident, authority and institution.

  20. TRES HISTORIAS SOBRE EL ESPAÑOL DEL PERÚ: LA INDIA, LA BLANCA Y LA MESTIZA

    Directory of Open Access Journals (Sweden)

    Carlos Garatea G.

    2017-06-01

    Full Text Available Muchas veces los historiadores de la lengua olvidan la diversidad textual; en otras, la presión ideológica puede deformar el valor de los textos y adscribirlos a expresiones de distinto origen. En este trabajo se muestra cómo se complementan y varían los registros y los niveles, de acuerdo con los tipos de textos, con la función de cada uno de ellos y, sobre todo, con la voluntad expresiva y la creatividad de los autores. Si bien el centro es la historia del español en el Perú, los criterios expuestos trascienden cualquier delimitación espacial y remiten a consideraciones teóricas y metodológicas de importancia en la historia de las lenguas.

  1. Estructura de «Torres Blancas», Madrid España

    Directory of Open Access Journals (Sweden)

    de Oiza, Sáenz

    1970-12-01

    Full Text Available The article describes the structural aspects and discusses the loading conditions and calculation procedures of this outstanding building, for which both the vertical and horizontal systems of forces were taken into account. The vertical structure involves 46 load bearing surfaces, of various shapes and of 15 to 20 cm thickness, with folded edges. Thanks to this, among other advantages, it is possible to reduce horizontal tensile forces and increase the strength in buckling. Horizontally, the structure consists of constant thickness slabs, of 20 cm depth, with chapitel reinforcements in the terraced zones. These slabs have constant bending strength in all directions. A separate description is given of the basic structure of the top social zone and of the lower one, related to the parking spaces, the pergola and the foundations.En el artículo se describen los problemas estructurales de un edificio de viviendas, en general, analizando las condiciones de trabajo y el proceso de cálculo de esta estructura singular, para lo que se estudia separadamente la organización vertical y la horizontal. La primera está constituida por 46 pantallas resistentes —de formas diversas y espesores entre 15 y 30 cm— con plegamientos en los bordes, gracias a los cuales se logra, entre otras ventajas, reducir las tracciones horizontales y aumentar el coeficiente de seguridad al pandeo. La organización horizontal adoptada ha sido la de losas de espesores constantes —de 20 cm, con refuerzos de capiteles en las glandes zonas de terrazas— que valoran por igual cualquier dirección de flexión. Se detallan, por separado, las estructuras fundamental, del núcleo social superior, y de la zona inferior, donde existen cuatro partes importantes: muros, aparcamiento, pérgola y cimentación.

  2. Geomorphologically effective floods from moraine-dammed lakes in the Cordillera Blanca, Peru

    Czech Academy of Sciences Publication Activity Database

    Emmer, Adam

    2017-01-01

    Roč. 177, DEC (2017), s. 220-234 ISSN 0277-3791 R&D Projects: GA MŠk(CZ) LO1415 Institutional support: RVO:86652079 Keywords : Andes * Documentary data * Geomorphology * glof * Lichenometry * Little Ice Age * Moraine-dammed lake * Outburst flood * South America Subject RIV: EH - Ecology, Behaviour OBOR OECD: Environmental sciences (social aspects to be 5.7) Impact factor: 4.797, year: 2016

  3. INITIAL TEST WELL CONDITIONING AT NOPAL I URANIUM DEPOSIT, SIERRA PENA BLANCA, CHIHUAHUA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    R.D. Oliver; J.C. Dinsmoor; S.J. Goldstein; I. Reyes; R. De La Garza

    2005-07-11

    Three test wells, PB-1, PB-2, and PB-3, were drilled at the Nopal I uranium deposit as part of a natural analogue study to evaluate radionuclide transport processes during March-April 2003. The initial pumping to condition the wells was completed during December 2003. The PB-1 well, drilled immediately adjacent to the Nopal I ore body, was continuously cored to a depth of 250 m, terminating 20 m below the top of the measured water level. The PB-2 and PB-3 wells, which were drilled on opposite sides of PB-1 at a radial distance of approximately 40 to 50 m outside of the remaining projected ore body, were also drilled to about 20 m below the top of the measured water level. Each test well was completed with 4-inch (10.2-cm) diameter PVC casing with a slotted liner below the water table. Initial conditioning of all three wells using a submersible pump at low pump rates [less than 1 gallon (3.8 1) per minute] resulted in measurable draw down and recoveries. The greatest drawdown ({approx}15 m) was observed in PB-2, whereas only minor (<1 m) drawdown occurred in PB-3. For PB-1 and PB-2, the water turbidity decreased as the wells were pumped and the pH values decreased, indicating that the contamination from the drilling fluid was reduced as the wells were conditioned. Test wells PB-1 and PB-2 showed increased inflow after several borehole volumes of fluid were removed, but their inflow rates remained less that the pumping rate. Test well PB-3 showed the smallest drawdown and least change in pH and conductivity during initial pumping and quickest recovery with a rise in measured water level after conditioning. The 195 gallons (750 l) of water pumped from PB-3 during conditioning was discharged through a household sponge. That sponge showed measurable gamma radiation, which decayed to background values in less than 12 hours. Preliminary interpretations include filtration of a radioisotope source with a short half-life or of a radioisotope that volatized as the sponge dried, such as Rn-222 and its short-lived daughters. No filtration was used during the pumping of PB-1 or PB-2.

  4. STRATIGRAPHY OF THE PB-1 WELL, NOPAL I URANIUM DEPOSIT, SIERRA PENA BLANCA, CHIHUAHUA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    NA

    2005-06-25

    Three wells, PB-1, PB-2, and PB-3, were drilled in 2003 at the Nopal I uranium deposit as part of a natural analogue study to evaluate radionuclide transport processes. The wells penetrate through the Tertiary volcanic section down to the Cretaceous limestone basement, and intersect the top of the regional aquifer system. The PB-1 well, drilled immediately adjacent to the Nopal I ore body, was cored to a depth of 250 m, thus providing an opportunity to document the local stratigraphy. The uppermost unit encountered in the PB-1 well is the Nopal Formation, a densely welded, crystal-rich rhyolitic ash-flow tuff. The cored section is highly altered and devitrified, with kaolinite, quartz, chlorite, and montmorillonite replacing feldspars and much of the groundmass. Breccia zones within the tuff contain fracture fillings of hematite, limonite, and goethite. A zone of intense clay alteration encountered in the depth interval 17.45-22.30 m was interpreted to represent the basal vitrophyre of this unit. Underlying the basal vitrophyre is the Coloradas Formation, which consists of a welded, lithic-rich rhyolitic ash-flow tuff. The cored section of this unit has undergone devitrification and oxidation, and has a similar alteration mineralogy to that observed in the Nopal tuff. The Nopal I ore body is restricted to a brecciated zone that intersects these two volcanic units. A sharp contact between the Coloradas tuff and the underlying Pozos Formation was observed at a depth of 136.38 m. The Pozos Formation in the PB-1 core consists of interbedded, poorly sorted sandstone and conglomerate layers. The conglomeratic clasts consist of subangular to subrounded fragments of volcanic rocks, limestone, and chert. Thin (2-6 m) intervals of intercalated pumiceous tuffs were observed within this unit. The contact between the Pozos Formation and the underlying Cretaceous limestone basement was observed at a depth of 244.4 m.

  5. REGIONAL HYDROLOGY OF THE NOPAL 1 SITE, SIERRA PENA BLANCA, CHIHUAHUA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    J.A. Rodriguez-Pineda; P. Goodell; P. Dobson; J. Walton; R. Olver; R. de la Garza; S. Harder

    2005-10-01

    The objectives of this report are: (1) Determine the main source of the groundwater (GW) found within the DOE wells (PB-1, PB-2, and PB-3); and (2) Determine whether the Nopal I GW has any relationship to the connectivity between the regional Encinillas Aquifer to the west and the El Cuervo Aquifer to the east.

  6. FUTURE STUDIES AT PENA BLANCA: RADIONUCLIDE MIGRATION IN THE VADOSE ZONE OF AN ALLUVIAL FAN

    Energy Technology Data Exchange (ETDEWEB)

    P. Goodell; J. Walton; P.J. Rodriguez

    2005-07-11

    The pathway to the accessible environment at Yucca Mountain contains volcanic rocks and alluvial fill. Transport properties in alluvial fill, specifically retardation and dispersivity, may be significant in determining the overall performance of the repository. Prior relevant studies, with the exception of the Nye County Tracer Test, are almost entirely in bedrock material. The proposed study will provide field data on radionuclide migration in alluvial material. High grade uranium ore was mined at the Nopal I deposit. This mined ore (60,000 tons) was moved in 1994 to its present site as open piles on an alluvial fan in the Boquilla Colorada Microbasin. Precipitation is approximately 20 cm/year, and has caused migration of radionuclides into the subsurface. We propose partial removal of an ore pile, excavation into the alluvial fan, sampling, and determination of radionuclide mobilities from the uranium decay chain. The proposed research would be taking advantage of a unique opportunity with a known time frame for migration.

  7. Two-Dimensional Model Test Study of the New Caisson Breakwater at Playa Blanca, Lanzarote

    DEFF Research Database (Denmark)

    Andersen, Thomas Lykke; Garborg, Karsten; Stagsted, Esben Rubech

    This report present the results of 2-D physical model tests (length scale 1:42.5) carried out in a wave flume at Department of Civil Engineering, Aalborg University (AAU) on behalf of SENER Ingenera y Sistemas S.A. Associate Prof. Thomas Lykke Andersen was in charge of the model tests, assisted b...

  8. Proceedings of the tenth scientific meeting at Bahia Blanca, 2-6 november 1981

    International Nuclear Information System (INIS)

    1984-06-01

    Compilation of 64 short papers by different authors, arranged in 5 sections, including the following groups of subjects: experimental reactors; instrumentation and control; nuclear and radiological safety; radioisotopes and radiations; nuclear power plants, and quality assurance. These papers deal with developments carried out at the National Atomic Energy Commission (CNEA) and firms related to Nuclear Programme. (R.J.S.) [es

  9. La Diosa Blanca y el Real Madrid. Celebraciones deportivas y espacio urbano

    Directory of Open Access Journals (Sweden)

    Ortiz García, Carmen

    2006-12-01

    Full Text Available One of the most frequent topics analyzed by anthropologists studying the social and cultural expressions around football is the relation between the soccer teams and the cities where they are based. In this paper an introduction is presented to the uses, both symbolic and practical, of the urban space by the soccer hooligans in Madrid and other Spanish cities. Specifically it treats the controversial question of the seizure in the last decades of some elements of the urban heritage (monuments, squares, fountains, etc. by huge concentration of hooligans celebrating the victories of their teams in the championships. The analysis of these “football parties” focuses on the various social agents playing a role in the definition of heritage and the possibilities of its public use.

    Las relaciones que tienen los equipos de fútbol con sus ciudades ha sido uno de los aspectos destacados más frecuentemente por los antropólogos dedicados al estudio de las manifestaciones sociales y culturales desarrolladas alrededor de este deporte. En este trabajo se parte de una presentación de las condiciones de uso, prácticas y simbólicas, del espacio urbano por parte de los hinchas de fútbol en Madrid y otras ciudades españolas. Concretamente se expone la cuestión polémica de la apropiación de ciertos elementos del patrimonio urbano (monumentos, plazas, fuentes ocurrida durante las últimas décadas en las grandes concentraciones que tienen lugar con motivo de la celebración de las victorias de los clubes en los campeonatos. El análisis de estas “fiestas del fútbol” se centrará en los diferentes agentes sociales que juegan un papel en la definición de los bienes patrimoniales y las posibilidades de uso del espacio público.

  10. Paleomagnetic, paleontologic and radiometric study of the Uquia Formation (Plio-Pleistocene) in Esquina Blanca (Jujuy)

    International Nuclear Information System (INIS)

    Walther, Ana M.; Orgeira, Maria J.; Vilas, Juan F.A.; Kelley, Shari; Jordan, Teresa

    1998-01-01

    A multidisciplinary study of the Uquia Formation has been performed. The results of the paleontologic, paleomagnetic, radiometric and stratigraphic analyses suggest that the superior levels of the formation are equivalent to the 'Marplatense Superior', while the basic ones should be considered older. Radiometric ages have been determined by fission tracks in zircons

  11. Mercury Levels in Human Hair and Farmed Fish near Artisanal and Small-Scale Gold Mining Communities in the Madre de Dios River Basin, Peru

    Directory of Open Access Journals (Sweden)

    Aubrey L. Langeland

    2017-03-01

    Full Text Available Artisanal and small-scale gold mining (ASGM has been an important source of income for communities in the Madre de Dios River Basin in Peru for hundreds of years. However, in recent decades, the scale of ASGM activities in the region has increased dramatically, and exposures to a variety of occupational and environmental hazards related to ASGM, including mercury, are becoming more widespread. The aims of our study were to: (1 examine patterns in the total hair mercury level of human participants in several communities in the region and compare these results to the 2.2 µg/g total hair mercury level equivalent to the World Health Organization (WHO Expert Committee of Food Additives (JECFA’s Provisional Tolerable Weekly Intake (PTWI; and (2, to measure the mercury levels of paco (Piaractus brachypomus fish raised in local aquaculture ponds, in order to compare these levels to the EPA Fish Tissue Residue Criterion of 0.3 µg Hg/g fish (wet weight. We collected hair samples from 80 participants in four communities (one control and three where ASGM activities occurred in the region, and collected 111 samples from fish raised in 24 local aquaculture farms. We then analyzed the samples for total mercury. Total mercury levels in hair were statistically significantly higher in the mining communities than in the control community, and increased with increasing geodesic distance from the Madre de Dios headwaters, did not differ by sex, and frequently exceeded the reference level. Regression analyses indicated that higher hair mercury levels were associated with residence in ASGM communities. The analysis of paco fish samples found no samples that exceeded the EPA tissue residue criterion. Collectively, these results align with other recent studies showing that ASGM activities are associated with elevated human mercury exposure. The fish farmed through the relatively new process of aquaculture in ASGM areas appeared to have little potential to contribute

  12. Low total mercury in Caiman yacare (Alligatoridae) as compared to carnivorous, and non-carnivorous fish consumed by Amazonian indigenous communities.

    Science.gov (United States)

    Rivera, S J; Pacheco, L F; Achá, D; Molina, C I; Miranda-Chumacero, G

    2016-11-01

    Mercury contamination in the River Beni basin is an important health risk factor, primarily for indigenous communities that live along the river. Among them are the Tacana, living in their original territory with sustainable use of their natural resources, consuming fish, Caiman yacare, and other riverine resources as their main source of protein. To assess mercury exposure to Tacana people, total mercury (THg) was evaluated in the muscle of seven commercial fish, and Caiman yacare (yacare caiman) during 2007 and 2008. THg was extracted by acid digestion and concentrations were determined by atomic absorption spectrometry. Mean mercury concentrations in C. yacare was 0.21 ± 0.22 μg g -1 Hg w.w. (wet weight), which is lower than expected given its high trophic level, and its long life-span. It is possible that mercury in C. yacare is accumulated in other organs, not included in this study; but it is also possible that physiological mechanisms are involved that help caimans get rid of ingested mercury, or simply that C. yacare's diverse diet reduces THg accumulation. Carnivorous fishes (Pygocentrus nattereri, Pseudoplatystoma tigrinum, Zungaro zungaro, Plagioscion squamosissimus, and Leiarius marmoratus) had the highest total mercury concentrations, ranging from 0.35 to 1.27 μg g -1 Hg w.w. moreover, most were above the limit recommended by WHO (0.5 μg g -1 Hg w.w.); except for Leiarius marmuratus, which presented a mean of 0.353 ± 0.322 μg g -1 Hg w.w. The two non-carnivorous fish species (Prochilodus nigricans, and Piaractus brachypomus) present mean concentrations of 0.099 ± 0.027, and 0.041 ± 0.019 μg g -1 Hg w.w., respectively. Finally, recommendations on the consumption habits of Tacana communities are discussed. Copyright © 2016 Elsevier Ltd. All rights reserved.

  13. Mercury Levels in Human Hair and Farmed Fish near Artisanal and Small-Scale Gold Mining Communities in the Madre de Dios River Basin, Peru.

    Science.gov (United States)

    Langeland, Aubrey L; Hardin, Rebecca D; Neitzel, Richard L

    2017-03-14

    Artisanal and small-scale gold mining (ASGM) has been an important source of income for communities in the Madre de Dios River Basin in Peru for hundreds of years. However, in recent decades, the scale of ASGM activities in the region has increased dramatically, and exposures to a variety of occupational and environmental hazards related to ASGM, including mercury, are becoming more widespread. The aims of our study were to: (1) examine patterns in the total hair mercury level of human participants in several communities in the region and compare these results to the 2.2 µg/g total hair mercury level equivalent to the World Health Organization (WHO) Expert Committee of Food Additives (JECFA)'s Provisional Tolerable Weekly Intake (PTWI); and (2), to measure the mercury levels of paco ( Piaractus brachypomus ) fish raised in local aquaculture ponds, in order to compare these levels to the EPA Fish Tissue Residue Criterion of 0.3 µg Hg/g fish (wet weight). We collected hair samples from 80 participants in four communities (one control and three where ASGM activities occurred) in the region, and collected 111 samples from fish raised in 24 local aquaculture farms. We then analyzed the samples for total mercury. Total mercury levels in hair were statistically significantly higher in the mining communities than in the control community, and increased with increasing geodesic distance from the Madre de Dios headwaters, did not differ by sex, and frequently exceeded the reference level. Regression analyses indicated that higher hair mercury levels were associated with residence in ASGM communities. The analysis of paco fish samples found no samples that exceeded the EPA tissue residue criterion. Collectively, these results align with other recent studies showing that ASGM activities are associated with elevated human mercury exposure. The fish farmed through the relatively new process of aquaculture in ASGM areas appeared to have little potential to contribute to human

  14. Growth and hematology of juvenile pacu Piaractus mesopotamicus (Holmberg 1887 fed with increasing levels of vitamin E (DL-α-tocopheryl acetate

    Directory of Open Access Journals (Sweden)

    RICARDO Y. SADO

    2013-03-01

    Full Text Available Intensive fish production systems are characterized by 100% artificial feeding, so any dietary imbalances or deficiencies may lead to diseases outbreaks and economic losses. This study was set out to determine the effects of increasing levels of dietary vitamin E on growth and hematology of juvenile pacu. Fishes were fed for 90 days, twice a day until apparent satiation with semi-purified diets containing 0.0; 25; 50; 150; 300 or 600 mg.kg−1 diet DL-α-tocopheryl acetate in a completely randomized design trial (n=4; biometrical and hematological data were collected and analyzed. Fishes fed with vit E diet (150 mg.kg−1 showed higher (p<0.05 weight gain and specific growth. Hematocrit, erythroblast number and total plasma protein were increased (p<0.05 in fishes fed diet with no vit E diet. Vitamin E supplementation in artificial diets for pacu is essential for growth and maintenance of normal erythropoiesis.

  15. Comparison between biochemical responses of the teleost pacu and its hybrid tambacu (Piaractus mesopotamicus x Colossoma macropomum) to short-term nitrite exposure.

    Science.gov (United States)

    Moraes, G; Avilez, I M; Hori, T S F

    2006-11-01

    Aquatic environmental factors are very changeable in short periods. Among these factors are pH, temperature, dissolved oxygen, ammonia and ions. Nitrite, as one ion naturally present in aquatic systems, deserves particular consideration as it is highly toxic for many species. Among fish, nitrite may have harmful effects, such as methemoglobin (MtHb) formation, disruption to the gill and hepatic structure, which could result in hemolytic anemia and cell hypoxia by reducing the functional hemoglobin content. In this work, we compared hematological and metabolical responses of pacu and its hybrid tambacu exposed to 20 ppm of environmental nitrite. It was observed that the MtHb content was less than 18% in tambacu while pacu reached nearly 8%. These data reflect specific differences in nitrite uptake by the gill. The hematocrit of both fish was distinct; pacu did not have a typical response of poisoning by nitrite. This fact shows less skill of the hybrid to cope with environmental nitrite. Incipient hemolytic anemia was observed in pacu and both species presented a neoglycogenic profile. The glucose-provider character of the liver was more evident in tambacu. The white muscle of both species presented distinct metabolic behavior. While in pacu the white muscle was predominantly oxidative, in tambaqui the lactic fermentation was the most important metabolic profile. Metabolic and hematological observations in both species show that they present distinct metabolical strategies to cope with toxic effects of nitrite and there is no evidence that the hybrid is more resistant to nitrite.

  16. 882 lakes of the Cordillera Blanca: An inventory, classification, evolution and assessment of susceptibility to outburst floods

    Czech Academy of Sciences Publication Activity Database

    Emmer, Adam; Klimeš, Jan; Mergili, M.; Vilímek, V.; Cochachin, A.

    2016-01-01

    Roč. 147, DEC (2016), s. 269-279 ISSN 0341-8162 R&D Projects: GA MŠk(CZ) LO1415 Institutional support: RVO:67985891 ; RVO:67179843 Keywords : high mountain lakes * GLOFs * environmental change * natural dams * Huascarán NP Subject RIV: DE - Earth Magnetism, Geodesy, Geography Impact factor: 3.191, year: 2016

  17. Experience in the transport and disposal of uranium mill tailings from Aldama City to Sierra Pena Blanca in Chihuahua, Mexico

    International Nuclear Information System (INIS)

    Ruiz, M.; Molina, G.; Angeles C, A.; Cruz G, S.; Lizacano C, D.; Reyes, J.; Rojas, V.

    1996-01-01

    In the process of decontamination, transport and disposal of uranium mill tailings, in the state of Chihuahua, Mexico, was necessary the multidisciplinary and multi institutional task to select mainly the site for the final disposal. The uranium mill tailings content Ra-226 which half live time is 1600 years, therefore the site should be adequately stable, a remote place of population, and which containment will survive for thousand of years. The decontamination of site where the uranium mill tailings were 25 years ago, required the application of norms from regulator organism. For the transport of uranium mill tailings was necessary that the vehicles had devices to reduce the dispersion of material in the road. The selection of the site was product of balance between the cost of transport and the final disposal. To typify the site, studies of hydrology, meteorology, ecology, geology and seismology were performed. On the other hand, the decision to locate the deposit in the site was due to dispersion of material by the rain, wind and bowls. (authors). 3 refs., 1 fig., 1 tab

  18. White matter cysts in patients with tuberous sclerosis; Quistes de sustancia blanca en pacientes con esclerosis tuberosa

    Energy Technology Data Exchange (ETDEWEB)

    Marti-Bonmati, L.; Dosda, R. [Hospital Universitario Dr. Peset. Servicio de Resonancia Magnetica ATQ-Quiron. Valencia (Spain); Menor, F. [Hospital Infantil La Fe. Valencia (Spain); Arana, E. [Hospital Casa de La Salud. Valencia (Spain); Poyatos, C. [Hospital Universitario Dr. Peset. Valencia (Spain)

    1999-07-01

    The presence of cysts in the white matter of the central nervous system of patients with tuberous sclerosis (TS) is an uncommon finding that has been reported only recently in neuroimaging studies. This article assesses the prevalence of these lesions in a large series of patients studied by magnetic resonance imaging (MRI) and their relationship to other epidemiological and imaging findings. MRI studies were performed in 46 patients (23 males and 23 females) with a mean age of 12.7 years, and the results were examined retrospectively in the search for cortical tubers, subependymal nodules and white matter nodules, lines and cysts. Nine patients (19.6%) presented cysts in white matter. Seven had only one cyst and the remaining two patients each had two. Multiple regression analysis relating the presence of the cysts with other neuroimaging findings in these patients revealed a statistically significant relationship only with white matter nodules (odds ratio: 7.5; p=0.006). White matter cysts are small, supratentorial lesions of deep location. There is a statistically relationship between the presence of these cysts and that of nodular lesions in the white matter. This finding supports the theory that the cyst originate from white matter nodules. (Author) 17 refs.

  19. Technical and economic evaluation of biogas capture and treatment for the Piedras Blancas landfill in Córdoba, Argentina.

    Science.gov (United States)

    Francisca, Franco Matías; Montoro, Marcos Alexis; Glatstein, Daniel Alejandro

    2017-05-01

    Landfill gas (LFG) management is one of the most important tasks for landfill operation and closure because of its impact in potential global warming. The aim of this work is to present a case history evaluating an LFG capture and treatment system for the present landfill facility in Córdoba, Argentina. The results may be relevant for many developing countries around the world where landfill gas is not being properly managed. The LFG generation is evaluated by modeling gas production applying the zero-order model, Landfill Gas Emissions Model (LandGEM; U.S. Environmental Protection Agency [EPA]), Scholl Canyon model, and triangular model. Variability in waste properties, weather, and landfill management conditions are analyzed in order to evaluate the feasibility of implementing different treatment systems. The results show the advantages of capturing and treating LFG in order to reduce the emissions of gases responsible for global warming and to determine the revenue rate needed for the project's financial requirements. This particular project reduces by half the emission of equivalent tons of carbon dioxide (CO 2 ) compared with the situation where there is no gas treatment. In addition, the study highlights the need for a change in the electricity prices if it is to be economically feasible to implement the project in the current Argentinean electrical market. Methane has 21 times more greenhouse gas potential than carbon dioxide. Because of that, it is of great importance to adequately manage biogas emissions from landfills. In addition, it is environmentally convenient to use this product as an alternative energy source, since it prevents methane emissions while preventing fossil fuel consumption, minimizing carbon dioxide emissions. Performed analysis indicated that biogas capturing and energy generation implies 3 times less equivalent carbon dioxide emissions; however, a change in the Argentinean electrical market fees are required to guarantee the financial feasibility of the project.

  20. Las guerrillas blancas: anticomunismo transnacional e imaginarios de derechas en Argentina y México, 1954-1972

    OpenAIRE

    Luis Alberto Herrán Ávila

    2015-01-01

    Este artículo explora los puntos de contacto entre grupos de extrema derecha en Argentina y México, en términos de sus trayectorias intelectua - les e ideológicas compartidas, sus discursos sobre “el enemigo” (el comunismo) y las maneras en que se inscribieron en contextos particulares de conflicto durante la Guerra Fría. Desde una perspectiva comparada, se abordan, en lo particular, los imaginarios políticos esbozados por los grupos Tacuara en Argentina y el Movimiento Universitario de Re...

  1. Las guerrillas blancas: anticomunismo transnacional e imaginarios de derechas en Argentina y México, 1954-1972

    Directory of Open Access Journals (Sweden)

    Luis Alberto Herrán Ávila

    2015-01-01

    Full Text Available Este artículo explora los puntos de contacto entre grupos de extrema derecha en Argentina y México, en términos de sus trayectorias intelectua - les e ideológicas compartidas, sus discursos sobre “el enemigo” (el comunismo y las maneras en que se inscribieron en contextos particulares de conflicto durante la Guerra Fría. Desde una perspectiva comparada, se abordan, en lo particular, los imaginarios políticos esbozados por los grupos Tacuara en Argentina y el Movimiento Universitario de Renovadora Orientación (MURO en México, y la manera en que intentaron insertarse en las cruzadas anticomunistas en sus respectivos países y en América Latina, entre 1954 y 1972. Enfrascados en sus propias luchas, aspiraciones y contradicciones, estos grupos buscaron crear espacios de militancia y acción nacionalista contrarrevolucionaria, y aunque marca - dos por la particularidad de lo nacional, fueron síntoma de una novedosa concepción de lucha política y espiritual contra el comunismo a escala global.

  2. Anomalies jointing in the Laguna Blanca area (Rocha district) about of radiometric anomaly sector with thorium characteristic

    International Nuclear Information System (INIS)

    Lara, P.

    1986-01-01

    In the following lines are sumarized the prospection works carried out on anomalous radiometric sectors located at the Department of Rocha (Uruguay) Its toriferous feature and the likely metallogenetic model to which they are associated are also developed

  3. Efectos difusivos en la formación de enanas blancas de Helio de baja masa en sistemas binarios cerrados

    Science.gov (United States)

    De Vito, M. A.; Benvenuto, O. G.

    In the last years, and thanks to advances in observational techniques, many astronomers have discovered in a great number of binary radio-pulsars the presence of a helium white dwarf resulting from a previous evolutionary state in which the progenitor of this star experienced one or more episodes of mass transfer to the compact component in the pair. That is the case for PSR B1855+09 (van Kerkwijk, M. H., Bell, J. F, Kaspi, V. M., & Kulkarni, S. R. 2000, ApJ 530, L37), where the mass for the white dwarf is known accurately from measurements of the Shapiro delay of the pulsar signal, MWD = 0.258+0.028-0.016 M⊙; for PSR J02018 + 4232 (Bassa, C. G., van Kerkwijk, M. H., & Kulkarni, S. R. 2003, A&A, 403, 1067), the spectra confirm that the companion is a helium-core white dwarf of ≈ 0.2 M⊙. On the other hand, there are several authors (Ferraro, F., Possenti, A., Sabbi, E., & D'Amico, N. 2003, ApJ, 596, L211; Bassa et al. 2003) that have identified the optical binary companion to the BMSP PSR J1911 - 5958A, located in the halo of the Galactic globular cluster NGC 6752, like a blue star whose position in the color-magnitude diagram is consistent with the cooling sequence of a low-mass, ≈ 0.17 - 0.20 M⊙, low metallicity helium white dwarf at the cluster distance. Finally, the color and magnitude of the stellar companion for B 1620-26 indicate that is a white dwarf of 0.34 ± 0.04 M⊙ (Sigurdson, S., Richer, H. B., Hansen, B. M., Stairs, I. H. & Thorset, S. E. 2003, Science, 301, 193S). This has motivated us to study the formation of low mass helium white dwarfs in the context of binary evolution. For that purpose, using the code of binary evolution, entirely developed in the Facultad de Ciencias Astronómicas y Geofísicas of the Universidad Nacional de La Plata, Argentina, we have investigated the effects of diffusive processes on the evolution of a star member of a close binary system. A similar study was performed for Althaus, L. G., Serenelli, A. M., & Benvenuto, O. G. (2001, MNRAS, 323, 471) but in that paper the mass transfer was mimicked by subtracting mass to a progenitor of 1 M⊙ to obtain the mass for the desired object. Actually, our binary code has a full nuclear reactions network for hydrogen and helium burning that allowed us to follow the abundances of fifteen isotopes throughout the entire evolution of the star. We have also included a detailed equation of state. The mass loss treatment is non conservative. We have modified the conditions for the beginning and end of mass transfer episodes. In our previous version, we assumed it to occur when the stellar radius was greater or smaller, respectively, that the Roche Lobe radius for the star. This introduced numerical problems, especially at the end of mass transfer phases. We adopted H. Ritter (1988, A&A, 202, 93) formulation that considers a finite scale height in the stellar atmosphere. The numerical behaviour in much more satisfactory, besides that it constitutes a more appropriate description for the physical problem. We perform the calculations for the evolution of the primary star in a close binary system of initial mass 2 M⊙, initial period of 1 day, initial mass ratio of 1.4142 and solar metallicity. We have done the calculations in four cases: A) with diffusion and all Roche Lobe overflows, B) with diffusion and only the first Roche Lobe overflow, C) without diffusion and all Roche Lobe overflows, D) without diffusion and only the first Roche Lobe overflow. Cases B) and D) where performed to compare with results obtained for Althaus et al. (2001). The main conclusion of this work is that the age of these objects is mainly determined by diffusive effects, and the late stages of mass transfer, not considered in Althaus et al. (2001), constituted a minor effect on the scales of cooling times.

  4. Evolución espacio-temporal en la ordenación territorial del municipio de Blanca (Murcia

    Directory of Open Access Journals (Sweden)

    José Molina Ruiz

    2010-01-01

    Nuestras actuaciones deberían ir encaminadas a proteger y conservar el legado de nuestros ancestros y a diseñar una ocupación territorial que no merme la calidad de un paisaje excepcional circunscrito en el Valle de Ricote.

  5. Indias blancas tierra adentro. El cautiverio femenino en la Frontera de la Araucanía, siglos XVIII y XIX

    Directory of Open Access Journals (Sweden)

    Yéssica González

    2016-07-01

    Full Text Available En este artículo se analiza la tensión experimentada por los grupos en contacto en la Frontera de la Araucanía en Chile para el periodo colonial y tardocolonial, a partir del estudio cautiverio, con énfasis en la cautividad femenina. Se trata de un estudio cualitativo, basado en la relectura de fuentes primarias y de archivo, tomando los lineamientos teóricos y metodológicos de la historia fronteriza y de género. Se caracteriza el cautiverio como una práctica transversal a los grupos en contacto, en que el cuerpo e imagen de la “cautiva”, como símbolo de derrota, fue crisol de la mezcla de sangres, cultura e identidades y objeto de instrumentalización política según sus intereses y las transformaciones de los siglos abarcados.

  6. Indias blancas tierra adentro. El cautiverio femenino en la Frontera de la Araucanía, siglos XVIII y XIX

    OpenAIRE

    Yéssica González

    2016-01-01

    En este artículo se analiza la tensión experimentada por los grupos en contacto en la Frontera de la Araucanía en Chile para el periodo colonial y tardocolonial, a partir del estudio cautiverio, con énfasis en la cautividad femenina. Se trata de un estudio cualitativo, basado en la relectura de fuentes primarias y de archivo, tomando los lineamientos teóricos y metodológicos de la historia fronteriza y de género. Se caracteriza el cautiverio como una práctica transversal a los grupos en conta...

  7. Uranium Elemental and Isotopic Constraints on Groundwater Flow Beneath the Nopal I Uranium Deposit, Pena Blanca, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    S.J. Goldstein; M.T. Murrell; A.M. Simmons

    2005-07-11

    The Nopal I uranium deposit in Chihuahua, Mexico, is an excellent analogue for evaluating the fate of spent fuel, associated actinides, and fission products over long time scales for the proposed Yucca Mountain high-level nuclear waste repository. In 2003, three groundwater wells were drilled directly adjacent to (PB-1) and 50 m on either side of the uranium deposit (PB-2 and PB-3) in order to evaluate uranium-series transport in three dimensions. After drilling, uranium concentrations were elevated in all of the three wells (0.1-18 ppm) due to drilling activities and subsequently decreased to {approx}5-20% of initial values over the next several months. The {sup 234}U/{sup 238}U activity ratios were similar for PB-1 and PB-2 (1.005 to 1.079) but distinct for PB-3 (1.36 to 1.83) over this time period, suggesting limited mixing between groundwater from these wells over these short time and length scales. Regional groundwater wells located up to several km from the deposit also have distinct uranium isotopic characteristics and constrain mixing over larger length and time scales. We model the decreasing uranium concentrations in the newly drilled wells with a simple one-dimensional advection-dispersion model, assuming uranium is introduced as a slug to each of the wells and transported as a conservative tracer. Using this model for our data, the relative uranium concentrations are dependent on both the longitudinal dispersion as well as the mean groundwater flow velocity. These parameters have been found to be correlated in both laboratory and field studies of groundwater velocity and dispersion (Klotz et al., 1980). Using typical relationships between velocity and dispersion for field and laboratory studies along with the relationship observed from our uranium data, both velocity (1-10 n/yr) and dispersion coefficient (1E-5 to 1E-2 cm{sup 2}/s) can be derived from the modeling. As discussed above, these relatively small flow velocities and dispersivities agree with mixing considerations derived from the {sup 234}U/{sup 238}U data. While these results and the limited productivity of these wells consistently suggest limited groundwater flow and mixing, we anticipate additional work with artificial tracers to better establish groundwater flow velocities and gradient at this site.

  8. Uranium-series constraints on radionuclide transport and groundwater flow at the Nopal I uranium deposit, Sierra Pena Blanca, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Goldstein, S.J.; Abdel-Fattah, A.I.; Murrell, M.T.; Dobson, P.F.; Norman, D.E.; Amato, R.S.; Nunn, A. J.

    2009-10-01

    Uranium-series data for groundwater samples from the Nopal I uranium ore deposit were obtained to place constraints on radionuclide transport and hydrologic processes for a nuclear waste repository located in fractured, unsaturated volcanic tuff. Decreasing uranium concentrations for wells drilled in 2003 are consistent with a simple physical mixing model that indicates that groundwater velocities are low ({approx}10 m/y). Uranium isotopic constraints, well productivities, and radon systematics also suggest limited groundwater mixing and slow flow in the saturated zone. Uranium isotopic systematics for seepage water collected in the mine adit show a spatial dependence which is consistent with longer water-rock interaction times and higher uranium dissolution inputs at the front adit where the deposit is located. Uranium-series disequilibria measurements for mostly unsaturated zone samples indicate that {sup 230}Th/{sup 238}U activity ratios range from 0.005-0.48 and {sup 226}Ra/{sup 238}U activity ratios range from 0.006-113. {sup 239}Pu/{sup 238}U mass ratios for the saturated zone are <2 x 10{sup -14}, and Pu mobility in the saturated zone is >1000 times lower than the U mobility. Saturated zone mobility decreases in the order {sup 238}U{approx}{sup 226}Ra > {sup 230}Th{approx}{sup 239}Pu. Radium and thorium appear to have higher mobility in the unsaturated zone based on U-series data from fractures and seepage water near the deposit.

  9. URANIUM-SERIES CONSTRAINTS ON RADIONUCLIDE TRANSPORT AND GROUNDWATER FLOW AT NOPAL I URANIUM DEPOSIT, SIERRA PENA BLANCA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    S. J. Goldstein, S. Luo, T. L. Ku, and M. T. Murrell

    2006-04-01

    Uranium-series data for groundwater samples from the vicinity of the Nopal I uranium ore deposit are used to place constraints on radionuclide transport and hydrologic processes at this site, and also, by analogy, at Yucca Mountain. Decreasing uranium concentrations for wells drilled in 2003 suggest that groundwater flow rates are low (< 10 m/yr). Field tests, well productivity, and uranium isotopic constraints also suggest that groundwater flow and mixing is limited at this site. The uranium isotopic systematics for water collected in the mine adit are consistent with longer rock-water interaction times and higher uranium dissolution rates at the front of the adit where the deposit is located. Short-lived nuclide data for groundwater wells are used to calculate retardation factors that are on the order of 1,000 for radium and 10,000 to 10,000,000 for lead and polonium. Radium has enhanced mobility in adit water and fractures near the deposit.

  10. Uranium-series constraints on radionuclide transport and groundwater flow at the Nopal I uranium deposit, Sierra Pena Blanca, Mexico.

    Science.gov (United States)

    Goldstein, Steven J; Abdel-Fattah, Amr I; Murrell, Michael T; Dobson, Patrick F; Norman, Deborah E; Amato, Ronald S; Nunn, Andrew J

    2010-03-01

    Uranium-series data for groundwater samples from the Nopal I uranium ore deposit were obtained to place constraints on radionuclide transport and hydrologic processes for a nuclear waste repository located in fractured, unsaturated volcanic tuff. Decreasing uranium concentrations for wells drilled in 2003 are consistent with a simple physical mixing model that indicates that groundwater velocities are low ( approximately 10 m/y). Uranium isotopic constraints, well productivities, and radon systematics also suggest limited groundwater mixing and slow flow in the saturated zone. Uranium isotopic systematics for seepage water collected in the mine adit show a spatial dependence which is consistent with longer water-rock interaction times and higher uranium dissolution inputs at the front adit where the deposit is located. Uranium-series disequilibria measurements for mostly unsaturated zone samples indicate that (230)Th/(238)U activity ratios range from 0.005 to 0.48 and (226)Ra/(238)U activity ratios range from 0.006 to 113. (239)Pu/(238)U mass ratios for the saturated zone are 1000 times lower than the U mobility. Saturated zone mobility decreases in the order (238)U approximately (226)Ra > (230)Th approximately (239)Pu. Radium and thorium appear to have higher mobility in the unsaturated zone based on U-series data from fractures and seepage water near the deposit.

  11. The NS3 protein of rice hoja blanca virus complements the RNAi suppressor function of HIV-1 Tat

    NARCIS (Netherlands)

    Schnettler, E.; Vries, de W.; Hemmes, J.C.; Haasnoot, J.; Kormelink, R.J.M.; Goldbach, R.W.; Berkhout, B.

    2009-01-01

    The question of whether RNA interference (RNAi) acts as an antiviral mechanism in mammalian cells remains controversial. The antiviral interferon (IFN) response cannot easily be distinguished from a possible antiviral RNAi pathway owing to the involvement of double-stranded RNA (dsRNA) as a common

  12. Control biológico de moscas blancas en cultivo de tomate: interacciones entre sus enemigos naturales

    OpenAIRE

    Moreno Ripoll, Rafael

    2011-01-01

    [spa] Para obtener un control biológico adecuado de las plagas presentes en un cultivo es importante determinar las relaciones tróficas que existen entre los enemigos naturales y su efecto sobre el control de estas plagas. Dos de estas interacciones, la depredación intragremial y el canibalismo, pueden condicionar el éxito de los programas de control biológico produciendo efectos aditivos o negativos sobre las poblaciones de la plaga. Para determinar la ingesta de todos los estados de desarro...

  13. Avaliação do crescimento e do custo da alimentação do pacu (Piaractus mesopotamicus Holmberg, 1887 submetido a ciclos alternados de restrição alimentar e realimentação Evaluation of the growth and feeding costs of pacu (Piaractus mesopotamicus submitted to alternate cycles of feeding restriction and refeeding

    Directory of Open Access Journals (Sweden)

    Valéria Leão Souza

    2003-02-01

    Full Text Available Avaliaram-se os efeitos da utilização de ciclos alternados de restrição alimentar e realimentação no crescimento do pacu, durante o período de engorda, e a viabilidade desta prática na produção comercial da espécie. Juvenis foram distribuídos em três tanques e submetidos a diferentes manejos alimentares, constituindo os tratamentos: A (alimentado ad libitum, B (restrição alimentar de 4 semanas, realimentado por 9 semanas e C (6 semanas de restrição alimentar, realimentado por 7 semanas, em um total de 13 semanas por ciclo (4 ciclos experimentais. No final de cada ciclo alimentar, 20 peixes de cada tratamento foram amostrados e os dados biométricos registrados. Os valores obtidos para peso, comprimento total e fator de condição (K foram submetidos a ANOVA e as médias comparadas pelo teste de Duncan. Os resultados mostraram que o tratamento C é o mais indicado somente para outono/inverno, promovendo maior crescimento, menor custo com ração, baixa conversão alimentar e maior receita líquida parcial. Entretanto, durante as estações mais quentes do ano (primavera/verão outros programas de alimentação devem ser testados, utilizando-se períodos mais curtos de restrição alimentar. Quando se tratou da produção anual, o tratamento A respondeu melhor em termos de biomassa produzida, apesar do maior gasto com alimentação, visto que, com o aumento da temperatura, o crescimento dos peixes dos demais tratamentos ficou prejudicado.The present study evaluated the effects of alternating food restriction and refeeding cycles on the growth of pacu, during the growout phase and the viability of this practice in the commercial production of the species. Juvenile fish were distributed in 3 tanks and submitted to different feeding strategies: group A (fed ad libitum daily, B (food restricted to 4 weeks and refed for 9 weeks and C (food restricted to 6 weeks and refed for 7 weeks totalizing 13 weeks per cycle (4 experimental cycles. At the end of each feeding cycle, 20 fish per treatment were sampled and the biometric data were registered. Values of weight, total length and condition factor (K were submitted to ANOVA and the averages were compared by Duncan test. The results showed that the treatment C presented better results only in autumn/winter periods, promoting better growth, lower cost ration, lower food conversion and better partial net income. Otherwise, during the warmer periods of the year (spring/summer other feeding strategies must be tested, utilizing shorter periods of food restriction. Regarding to the annual production, the treatment A showed higher biomass, although higher feeding costs. With the increase in the temperature, the growth of the fish from the other treatments was delayed.

  14. Métodos de coleta de fezes e determinação dos coeficientes de digestibilidade da fração protéica e da energia de alimentos para o pacu, Piaractus mesopotamicus (Holmberg, 1887) Fecal collection methods and determination of crude protein and of gross energy digestibility coefficients of feedstuffs for pacu, Piaractus mesopotamicus (Holmberg, 1887)

    OpenAIRE

    Eduardo Gianini Abimorad; Dalton José Carneiro

    2004-01-01

    Para melhorar a alimentação do pacu (Piaracatus mesopotamicus), é necessário conhecer o nível de aproveitamento dos ingredientes utilizados em suas dietas. Neste trabalho, inicialmente, foram analisados quatro métodos de coleta de fezes, em função da precisão e da versatilidade (dissecação, extrusão, Guelph e Guelph modificado), e o tempo entre as coletas de fezes nos sistemas de Guelph, por intermédio do coeficiente de digestibilidade da proteína bruta de uma dieta-referência para o pacu. Nã...

  15. Substituição de alimento vivo por alimento inerte na larvicultura intensiva do tambacu (♀ Colossoma macropomum X ♂ Piaractus mesopotamicus = Replacement of live food for inert food on larviculture of tambacu (♀ Colossoma macropomum X ♂ Piaractus mesopotamicus

    Directory of Open Access Journals (Sweden)

    Danieli Cuzini Lombardi

    2008-10-01

    Full Text Available Com este trabalho objetivou-se avaliar a substituição de náuplios de Artemia salina por alimentos inertes durante a larvicultura do tambacu. Na primeira fase, com duração de 12 dias, as larvas foram alimentadas com: náuplio de Artemia salina, cyclop-eeze e ovo de Artemia salina. Na segunda fase, com duração de dez dias, foram utilizadas larvas alimentadas com náuplios de Artemia salina provenientes da primeira fase e testados os mesmos três alimentos. A qualidade da água manteve-se em condições adequadas para alarvicultura nas duas fases. As larvas da primeira fase alimentadas com náuplios de Artemia salina obtiveram os melhores resultados em crescimento, sobrevivência e desempenho produtivo. Na segunda fase, o crescimento, a sobrevivência e o desempenho produtivo das larvas alimentadas com náuplios de Artemia salina e ovo de Artemia salina foram semelhantes. Nas duas fases, o custo com alimento foi mais baixo nas larvas alimentadas com náuplios de Artemia salina. Os resultados obtidos mostram que nas duas fases de larvicultura testadas a oferta de náuplios de Artemia salina é a melhor estratégia alimentar por proporcionar boa sobrevivência, crescimento e bom desempenho produtivo, além de menor custo.The aim of this work was to evaluate the replacement of Artemia salina nauplii by inert food during larviculture of tambacu. On the first phase with duration of 12 days, the larvae were fed with one of the following foods: Artemia salina nauplii, cyclop-eeze or Artemia salina egg. On the second phase, with 10 days of duration, larvae fed with Artemia salina nauplii were utilized in the first experiment and the same food treatments were tested. Water quality was adequate forlarvae rearing in both phases. The larvae from the first phase that fed with Artemia salina nauplii presented better growth, survival rate and yield. On the second phase, the growth, survival and yield of larvae fed with Artemia salina nauplii and eggs were similar. On both phases, the food cost was lower for larvae fed with Artemia salina nauplii. The obtained results shown that on the two rearing phases the use of Artemia salina nauplii is the better feeding strategies, as the survival, growth, yield were greater than in the others treatments, and also showed the lower cost.

  16. Influência de diferentes aglutinantes na digestibilidade aparente da matéria seca e da proteína, no pacu (Piaractus mesopotamicus arraçoado com rações elaboradas com ou sem vapor Influence of different binders in the apparent digestibility of dry matter and protein in pacu (Piaractus mesopotamicus fed with ration processed with or without steam

    Directory of Open Access Journals (Sweden)

    Maria Angélica Rosa Ribeiro

    1999-07-01

    Full Text Available O trabalho foi realizado no Centro Nacional de Pesquisa de Peixes Tropicais - Cepta, com o objetivo de determinar a influência de vários aglutinantes: carboximetilcelulose, polimetilcarbamida, amido de mandioca, alginato de sódio, polivinilpirrolidona e goma guar, bem como a técnica de processamento, com ou sem vapor, na digestibilidade aparente das frações matéria seca e proteína bruta. Os resultados obtidos demonstraram que a técnica de processamento a que se submete a mistura, durante a confecção de ração para peixes, influencia o coeficiente de digestibilidade aparente das frações matéria seca e proteína bruta, em pacus. Quando da confecção de rações para peixes, houver a necessidade de utilizar-se de aglutinantes, a fim de obter pelletes mais estáveis, recomenda-se, para os equipamentos dotados de câmara de acondicionamento com adição de vapor, a polivinilpirrolidona, e para os sem a adição de vapor, a goma guar.This work was carried out at National Research of Tropical Fishes - Cepta, with the objective to determine the influence of different dietary binders with their respective concentrations: sodium alginate, guar gum, polymethylolcarbamide, polyvinylpyrrolidone, carboxymethylcellulose, cassava starch, and the manufacturing process with or without steam, in the apparent digestibility of protein and dry matter. The results obtained showed that the manufacturing technique during the fish ration process, influences the apparent digestibility coefficient of dry matter and protein in pacu. When binders are required to obtain more stable diet pellets, polyvinylpyrrolidone for equipments with steam addition chambers and guar gum for equipment without steam are recommended.

  17. Métodos de coleta de fezes e determinação dos coeficientes de digestibilidade da fração protéica e da energia de alimentos para o pacu, Piaractus mesopotamicus (Holmberg, 1887 Fecal collection methods and determination of crude protein and of gross energy digestibility coefficients of feedstuffs for pacu, Piaractus mesopotamicus (Holmberg, 1887

    Directory of Open Access Journals (Sweden)

    Eduardo Gianini Abimorad

    2004-10-01

    Full Text Available Para melhorar a alimentação do pacu (Piaracatus mesopotamicus, é necessário conhecer o nível de aproveitamento dos ingredientes utilizados em suas dietas. Neste trabalho, inicialmente, foram analisados quatro métodos de coleta de fezes, em função da precisão e da versatilidade (dissecação, extrusão, Guelph e Guelph modificado, e o tempo entre as coletas de fezes nos sistemas de Guelph, por intermédio do coeficiente de digestibilidade da proteína bruta de uma dieta-referência para o pacu. Não houve diferença entre os métodos de coleta de fezes; já os intervalos de tempo das coletas apresentaram diferenças, podendo interferir nos resultados de digestibilidade da proteína. Em uma segunda etapa, para determinação dos coeficientes de digestibilidade da proteína e da energia de cinco concentrados protéicos de origem animal, cinco de origem vegetal e quatro energéticos, foram utilizadas rações elaboradas com 69,5% de uma dieta-referência, 30% do ingrediente teste e 0,5% de Cr2O3, utilizando o método de extrusão manual para a coleta de fezes. Os valores de digestibilidade da proteína da maioria dos alimentos apresentaram-se altos e não variaram estatisticamente, de 93,89 a 75,73% para o farelo de trigo e a farinha de penas, respectivamente. Entretanto, a farinha de sangue e a levedura apresentaram valores de digestibilidade da fração protéica significativamente inferiores (57,72 e 68,86%, respectivamente. Os coeficientes de digestibilidade da energia dos alimentos variaram consideravelmente, apresentando altos valores (acima de 90% para o sorgo, o farelo de arroz e as sojas crua e tostada, e baixos valores (menores que 70% para as farinhas de vísceras e de sangue, os farelos de soja e de algodão e a levedura. Quanto aos métodos de coleta de fezes, conclui-se que qualquer um pode ser adotado para a determinação de digestibilidade, desde que sejam rigorosamente aplicados. De maneira geral, a maioria dos concentrados protéicos pode ser utilizada como ótimas fontes de proteína, com exceção da farinha de sangue e a levedura, enquanto os alimentos energéticos confirmaram-se como excelentes fontes de energia em dietas para o pacu.To improve the pacu (Piaracatus mesopotamicus feeding in the growth phase, it's necessary to know the digestibility of the ingredients used in his diets. Initially, four fecal collection methods were analyzed (dissection, stripping, Guelph and modified Guelph, based on precision and versatility and also the most efficient time among fecal collection of the Guelph sedimentation systems, through crude protein digestibility coefficient of pacu basic diet. There was no difference among the fecal collection methods while the intervals of time among the collections were significantly different, which may interfere in the protein digestibility results. In a second stage, five proteins concentrated of animal origin, five of vegetable origin and four energetic were studied for estimating protein and energy digestibility coefficients using the stripping method. The rations contained 69.5% of a reference diet, 30.0% of the ingredient test and 0.5% of Cr2O3. In a general way, crude protein digestibility coefficients were high and did not differ from the wheat meal (93.89% and feather flour (75.73%, respectively. However, blood and yeast showed lower crude protein digestibility (57.72% and 68.86%, respectively. Gross energy digestibility coefficients varied considerably among the feedstuffs, showing high values (above 90% for the sorghum, rice meal and raw and toasted soy and lower values (smaller than 70% for poultry by-product and blood meal, soybean meal, cotton and yeast. However, with regard to the fecal collection methods, the results showed that anyone can be adopted with safety for digestibility determination, if used accurately. In a general way, most of protein concentrate can be used as a very good protein source, except for blood meal and the yeast. The energy concentrate revealed to be a source of energy in pacu diets.

  18. Stress responses in juvenile pacu (Piaractus mesopotamicus submitted to repeated air exposure - DOI: 10.4025/actascianimsci.v30i1.3618 Stress responses in juvenile pacu (Piaractus mesopotamicus submitted to repeated air exposure - DOI: 10.4025/actascianimsci.v30i1.3618

    Directory of Open Access Journals (Sweden)

    Leonardo Susumu Takahashi

    2008-06-01

    Full Text Available Juvenis de pacu (5,2 Pacu juveniles (5.2 ± 1.5 g were submitted to two one-minute air exposures in a 24 h interval, and sampled before the exposure (control and 5, 15, 30 and 60 min, 24 and 48 h afterwards for whole-body cortisol, sodium, potassium and calcium ion concentrations. For the first air exposure, there was a trend of increased cortisol concentration after 15 min, whereas in the second air exposure, the cortisol concentration increased significantly within 5 min after stress was induced. Sodium ion concentration increased significantly 24 h after both air exposures. Potassium concentration presented fluctuations over the experimental period. Calcium ion concentration increased progressively from 5 to 30 min, in both air exposures. The repeated air exposures exacerbated the cortisol response, but they did not affect the recovery ability of pacu over the experimental period. Additionally, the whole-body cortisol measurement might be a reliable indicator of stress, when sampled fish are smaller and blood volumes are very low, making samples inadequate for analysis1,5 g foram submetidos a duas exposições aéreas de um minuto, em intervalo de 24 horas, e amostrados antes da exposição (controle e 5, 15, 30 e 60 min, 24 e 48 horas depois para análise da concentração corporal de cortisol e dos íons sódio, potássio e cálcio. Na primeira exposição, os peixes apresentaram concentrações de cortisol aumentadas a partir de 15 min, embora não diferissem estatisticamente do controle. Na segunda exposição, a concentração de cortisol aumentou significativamente aos 5 min, retornando às concentrações equivalentes às dos peixes-controle em 30 min. A concentração do íon sódio aumentou significativamente 24 horas depois das duas exposições aéreas. A concentração do íon potássio apresentou flutuações durante o experimento, enquanto a do cálcio apresentou-se reduzida aos 5 min, aumentando gradativamente até os 30 min, nas duas exposições. A repetição do fenômeno estressor exacerbou a liberação de cortisol, mas não afetou a capacidade de recuperação dos peixes. A análise do cortisol tecidual pode ser considerada um indicador confiável de estresse.Pacu juveniles (5.2 ± 1.5 g were submitted to two one-minute air exposures in a 24 h interval, and sampled before the exposure (control and 5, 15, 30 and 60 min, 24 and 48 h afterwards for whole-body cortisol, sodium, potassium and calcium ion concentrations. For the first air exposure, there was a trend of increased cortisol concentration after 15 min, whereas in the second air exposure, the cortisol concentration increased significantly within 5 min after stress was induced. Sodium ion concentration increased significantly 24 h after both air exposures. Potassium concentration presented fluctuations over the experimental period. Calcium ion concentration increased progressively from 5 to 30 min, in both air exposures. The repeated air exposures exacerbated the cortisol response, but they did not affect the recovery ability of pacu over the experimental period. Additionally, the whole-body cortisol measurement might be a reliable indicator of stress, when sampled fish are smaller and blood volumes are very low, making samples inadequate for analysis

  19. General Aviation Activity and Avionics Survey 1983.

    Science.gov (United States)

    1984-10-01

    8217- -0 OW s-O Ct0 -J 2 IC a:2 cc CO- I-- 2 Z Z- a * ujs - n cc <U Ix0 00 COO0-4 U -j at- L- £ C)-4 a2 u Zan LUZ <-ci V) - -. f- C-0 2 2 20 220 0 C4 r... BLANCAS 2110612 BLANCA7 1220438 BLANCA7 1220460 BNORM BN2 *BN2 BLANCA7 1220460 BLANCA7 1220501 BNORM *N2 1520202 BLANCA7 1220501 BLANCA7 1220601 BNORN

  20. Efecto inmunosupresor de Trypanosoma lewisi (Kinetoplastidae sobre la multiplicación de Toxoplasma gondii (Sarcocystidae en macrófagos alveolares y peritoneales de rata blanca

    Directory of Open Access Journals (Sweden)

    Nivia J Ríos Carrera

    2009-06-01

    Full Text Available El efecto inmunosupresor de la infección de T. lewisi sobre la multiplicación de T. gondii fue comparado en macrófagos peritoneales (MP y alveolares (MA de rata. El número de parásitos (taquizoitos intracelulares (TI fue contado por microscopía de luz. Los macrófagos alveolares y peritoneales (MP de animales con 4 días de infección con T. lewisi muestran un aumento significativo en la multiplicación de T. gondii. A diferencia de los MP (que muestran un aumento en la multiplicación de T. gondii al cuarto día de infección con T. lewisi disminuyendo hacia el séptimo día, los MA mantienen un aumento en la multiplicación del parásito desde el cuarto, aumentando hacia el séptimo día de infección. Esta diferencia se puede deber a la ruta de infección utilizada para los experimentos que afectan directamente los MP donde se observa un efecto mayor y más temprano en comparación con los MA aislados de los pulmones, compartimiento afectado cuando la infección se vuelve sistémica entre el cuarto y sexto día de infección. La inmunidad contra T. gondii es similar entre ambas células fagocíticas, pero el tiempo de infección y el compartimiento donde se encuentren las células hace la diferencia en el tiempo de respuesta contra un parásito dado, en nuestro caso T. gondii. No hubo evidencia de que los sobrenadantes de cultivos de macrófagos provenientes de ratas infectadas ni el lisado de tripanosomas indujeran el efecto inmunosupresor.The immunosuppressant effect of T. lewisi (Kinetoplastidae infection on the multiplication of Toxoplasma gondii (Sarcocystidae on alveolar and peritoneal macrophages of the white rat. The immunosuppressant effect of T. lewisi infection on the multiplication of T. gondii was compared in peritoneal (MP and alveolar macrophages (MA of white rat. Two animal groups were infected with T. lewisi and sacrificed after four days and seven days post infection. A group without infection was maintained as a control. The number of intracellular parasites (tachyzoites (IT was counted by light microscopy, calculating the rate infection rate per 100 total cells (TC and per infected cells (IC for each group of phagocyte cells. The relation quotient IT, TC or IC multiplied percent, provided a statistical ratio (RE of the relative number of parasites in both cellular types for each time interval. MA as well as MP obtained after 4 days showed a significant increase in the multiplication of T. gondii with respect to the control. Unlike the MP (which had an increase in the multiplication of T. gondii the fourth day of infection with T. lewisi diminishing towards the seventh day, the MA had an increase in the multiplication of the parasite from the fourth to the seventh day. This difference can be related to the route of infection used for the experiments, that affect the MP directly with a greater effect in comparison with the MA of the lungs. Lung compartment will be affected later, when the infection becomes systemic between the fourth and sixth day of infection. The immunity against T. gondii is similar between both phagocytes, but the time of infection and the compartment where the cells are located, makes the difference in the response time against T. gondii. Supernatants from macrophage cultures or T. lewisi by rat did not induced any immunosuppression. Rev. Biol. Trop. 57 (1-2: 13-22. Epub 2009 June 30.

  1. Sociólogos-de-bata-blanca y médicos-con-barba: Relaciones entre las ciencias sociales y la medicina en España

    Directory of Open Access Journals (Sweden)

    JESÚS M. DE MIGUEL

    1981-01-01

    Full Text Available Se analiza la autarquía cultural y económica de España durante la décadas iniciales del franquismo y la consiguiente atrofia de las ciencias sociales y las humanidades. Se discute el fenómeno casi único español de la politización de los médicos españoles y su diáspora a Mexico después de la Guerra Civil.

  2. Un personaje para la (blanca nación argentina. El negro benito, teatro y mundo urbano popular porteño a fines del siglo XIX

    Directory of Open Access Journals (Sweden)

    Lea Geler

    2015-06-01

    Full Text Available A fines del siglo xix, la población afrodescendiente de Buenos Aires ya se declaraba oficialmente desaparecida y se asentaba el proceso de su invisibilización. Sin embargo, en el contexto del gran movimiento local del teatro popular, la figura del «negro» continuaba teniendo particular relevancia. Entendiendo el teatro como un espacio de construcción de subjetividad y de generación de communitas que tuvo una importancia fundamental en la conformación de lo popular porteño, me centraré en el personaje de Benito de la obra teatral de Ezequiel Soria Justicia criolla, estrenada en Buenos Aires en 1897. Propondré que el análisis de este personaje −de gran éxito en la cartelera porteña− permite conocer algunos de los lineamientos por los que se imponía y negociaba la blanquitud y lo autóctono-popular, mientras se producía la marginación de los afrodescendientes al olvido.

  3. Modelování průtokové vlny z ledovcového jezera - Lake 513, Cordillera Blanca, Peru

    Czech Academy of Sciences Publication Activity Database

    Benešová, M.; Bouška, P.; Klimeš, Jan; Vilímek, V.

    2012-01-01

    Roč. 54, č. 5 (2012), s. 4-7 ISSN 0322-8916 R&D Projects: GA ČR(CZ) GAP209/11/1000 Institutional research plan: CEZ:AV0Z30460519 Keywords : mathematical modeling * floods * glacial lakes Subject RIV: DE - Earth Magnetism, Geodesy, Geography http://www.vuv.cz/fileadmin/user_upload/pdf/vtei/2012/vtei_5-2012.pdf

  4. CONVERSIONES RELIGIOSAS E HISTORIA ORAL. SUBTÍTULO: PENTECOSTALES Y MORMONES EN CONTEXTOS MIGRATORIOS, EN BAHÍA BLANCA Y ÁREA DE INFLUENCIA

    Directory of Open Access Journals (Sweden)

    Graciela Hernández

    2011-06-01

    Full Text Available Proponemos analizar distintos testimonios que dan cuenta de las razones de la conversión religiosa a iglesias evangélicas pentecostales y mormona. Trataremos deconceptualizar el contexto en el que se dan estos procesos sociales así como las razones teóricas y metodológicas de este recorte de investigación en el que vinculamos procesos migratorios y conversiones religiosas. El trabajo se encuadra en los presupuestos teóricos de la historia oral que recoge sustestimonios en el mundo de la vida con una metodología cualitativa etnográfica centradaprincipalmente en la entrevista y la observación participante.

  5. CONVERSIONES RELIGIOSAS E HISTORIA ORAL. SUBTÍTULO: PENTECOSTALES Y MORMONES EN CONTEXTOS MIGRATORIOS, EN BAHÍA BLANCA Y ÁREA DE INFLUENCIA

    OpenAIRE

    Graciela Hernández

    2011-01-01

    Proponemos analizar distintos testimonios que dan cuenta de las razones de la conversión religiosa a iglesias evangélicas pentecostales y mormona. Trataremos deconceptualizar el contexto en el que se dan estos procesos sociales así como las razones teóricas y metodológicas de este recorte de investigación en el que vinculamos procesos migratorios y conversiones religiosas. El trabajo se encuadra en los presupuestos teóricos de la historia oral que recoge sustestimonios en el mundo de la vida ...

  6. Conversiones religiosas e historia oral. Pentecostales y mormones en contextos migratorios en Bahía Blanca y área de influencia.

    OpenAIRE

    Hernández, Graciela Beatriz

    2011-01-01

    Proponemos analizar distintos testimonios que dan cuenta de las razones de la conversión religiosa a iglesias evangélicas pentecostales y mormona. Trataremos de conceptualizar el contexto en el que se dan estos procesos sociales así como las razones teóricas y metodológicas de este recorte de investigación en el que vinculamos procesos migratorios y conversiones religiosas El trabajo se encuadra en los presupuestos teóricos de la historia oral que recoge sus testimonios en el mundo ...

  7. Oscilaciones estelares no-radiales: aplicación a configuraciones politrópicas y modelos de enanas blancas de He

    Science.gov (United States)

    Córsico, A. H.; Benvenuto, O. G.

    Recently in our Observatory we have developed a new Stellar Pulsation Code, independently of other workers. Such program computes eigenvalues (eigenfrequencies) and eigenfunctions of non-radial modes in spherical non-perturbated stellar models. To accomplish this calculations, the four order eigenvalue problem (in the linear adiabatic approach) is solved by means of the well-know technique of Henyey on the finite differences scheme wich replace to the differential equations of the problem. In order to test the Code, we have computed numerous eigenmodes in polytropic configurations for several values of index n. In this comunication we show the excelent agreement of our results and that best available in the literature. Also, we present results of oscillations in models of white dwarf stars with homogeneus chemical composition (pure Helium). This models have been obtained with the Evolution Stellar Code of our Observatory. The calculations outlined above conform a first preliminary step in a major proyect whose main purpose is the study of pulsational properties of DA, DB and DO white dwarfs stars. Detailed investigations have demonstrated that such objets pulsates in non-radial g-modes with eigenperiods in the range 100-2000 sec.

  8. El fomento a la lectura, la literatura en el ámbito LGBT y la necesidad de una "Novela Blanca" en el periodo de la adolescencia

    OpenAIRE

    Cotilla Conceição, José Manuel

    2016-01-01

    Este estudio nace de la necesidad de evaluar la cantidad y tipología de literatura homosexual existente en el mercado. Esto se hace con el fin de comprobar si existen obras y material especialmente dedicado y pensado para los adolescentes; y en caso contrario, cuáles son los motivos históricos, sociales y culturales que determinan la situación actual. Se parte de un punto de partida donde las obras y estereotipos comúnmente hallados en la ya ínfima lista de obras catalogadas como literatura h...

  9. Use of rice straw ash as substitute of feldspar in triaxial porcelain; Cenizas del tamo de arroz como substituto del feldespato en la fabricacion de ceramica blanca

    Energy Technology Data Exchange (ETDEWEB)

    Alvaro Guzman, A.; Silverio Delvasto, A.; Enrique Sanchez, V.; Vicente Amigo, B.

    2013-02-01

    The substitution of raw materials for processing high energy consumption materials by agricultural and agro-industrial wastes causes a positive impacts on the environment preservation. One of these residues is rice straw, which according to FAO estimation, its annual production is about 600 million tons. In this research was studied the use of rice straw ash as substitute of the use of feldspar in the white ware production. Clay-feldspar-quartz porcelains are referred to as triaxial white ware. Specimens of semidry triaxial mixtures, where feldspar was substituted for different percentages of CTA, were prepared by uniaxial pressing, followed by drying and sintering. Physical and mechanical properties of sintered bodies were evaluated. The porosity and the compressive strength of the fired pieces do increase with additions of up to 75% of CTA in substitution of feldspar. Their mineralogical phases were determined by DRX and SEM; grains of quartz, and needles of primary and secondary mullite were identified in a vitreous phase. It was concluded that feldspar can be substituted positively by CTA in white ware pastes. (Author) 22 refs.

  10. Primeros datos sobre movimientos de cigüeñas blancas Ciconia ciconia L., 1758 anilladas como pollos en nido en Navarra: 2012-2015.

    Directory of Open Access Journals (Sweden)

    Jaime Resano-Mayor, Juan M. Barbarín, Daniel Alonso, Blanca Fernández-Eslava, Diego Villanua, Jesús Mari Lekuona, Ricardo Rodríguez,

    2016-01-01

    (i.e., avistamientos como muertos (i.e., recuperaciones, en su mayoría por electrocución. Todos los avistamientos, excepto tres, se realizaron en vertederos (n = 64, en donde el esfuerzo de muestreo fue considerablemente mayor. Dos avistamientos correspondieron a cigüeñas observadas en humedales, así como otro ejemplar que se observó dos años después en la colonia donde nació (i.e., reclutamiento. La distancia promedio de avistamiento en relación a la colonia de anillamiento fue de 48 km (distancia máxima, 410 km. La mayoría de avistamientos/recuperaciones se realizó durante la primavera y verano, con independencia de la edad. Todas las aves que se hallaron muertas (n = 7 fueron jóvenes encontrados en la proximidad de sus colonias de nacimiento.

  11. Un humilladero del taller de Juan Bautista Vázquez "El Viejo": la Cruz Blanca en Alcalá del Río (Sevilla)

    OpenAIRE

    Albardonedo Freire, Antonio José

    2011-01-01

    Estudio de una cruz de camino en mármol de Alcalá del Río (Sevilla), del taller de Juan Bautista Vázquez “El Viejo” (1576). Study of a monumental cross in marble at Alcalá del Río (Seville) (1576), executed in the workshop of Juan Bautista Vázquez “El Viejo”

  12. A Record of Uranium-Series Transport in Fractured, Unsaturated Tuff at Nopal I, Sierra Peña Blanca, Chihuahua, Mexico

    Science.gov (United States)

    Denton, J.; Goldstein, S. J.; Paviet, P.; Nunn, A. J.; Amato, R. S.; Hinrichs, K. A.

    2015-12-01

    In this study we utilize U-series disequilibria measurements to investigate mineral fluid interactions and the role fractures play in the geochemical evolution of an analogue for a high level nuclear waste repository, the Nopal I uranium ore deposit. Samples of fracture-fill materials have been collected from a vertical drill core and surface fractures. High uranium concentrations in these materials (12-7700 ppm) indicate U mobility and transport from the deposit in the past. U concentrations generally decrease with horizontal distance away from the ore deposit but show no trend with depth. Isotopic activity ratios indicate a complicated geochemical evolution in terms of the timing and extent of actinide mobility, possibly due to changing environmental (redox) conditions over the history of the deposit. 234U/238U activity ratios are generally distinct from secular equilibrium and indicate some degree of open system U behavior during the past 1.2 Ma. However, calculated closed system 238U-234U-230Th model ages are generally >313 ka and >183 ka for the surface fracture and drill core samples respectively, suggesting closed system behavior for U and Th over this most recent time period. Whole rock isochrons drawn for the drill core samples show that at two of three depths fractures have remained closed with respect to U and Th mobility for >200 ka. However, open system behavior for U in the last 350 ka is suggested at 67 m depth. 231Pa/235U activity ratios within error of unity suggest closed system behavior for U and Pa for at least the past 185 ka. 226Ra/230Th activity ratios are typically <1 (0.7-1.2), suggesting recent (<8 ka) radium loss and mobility due to ongoing fluid flow in the fractures. Overall, the mainly closed system behavior of U-Th-Pa over the past ~200 ka provides one indicator of the geochemical immobility of these actinides over long time-scales for potential nuclear waste repositories sited in fractured, unsaturated tuff.

  13. Ecotoxicologia do agrotóxico fipronil em pacu (Piaractus mesopotamicus Holmerg) e paulistinha (Danio rerio) e resíduos de agrotóxicos na bacia do rio Corumbataí

    OpenAIRE

    Ana Lucia Cella

    2009-01-01

    A bacia do Corumbataí apesar de seu estado considerável de preservação, no que diz respeito à quantidade e qualidade das águas, merece grande atenção visto que abastece os municípios de Piracicaba, Santa Gertrudes, Rio Claro, Corumbataí e Analândia e recebe descargas de esgoto doméstico e industrial de 7 municípios a montante (Analândia, Corumbataí, Ipeúna, Itirapina, Santa Gertrudes, Rio Claro e Charqueada). Além do que, é expressivo o uso intensivo dos solos desses municípios para o cultivo...

  14. Influência da adição de iodeto de potássio e citrato de sódio na qualidade do sêmen de pacu (Piaractus mesopotamicus - Holmberg, 1887)

    OpenAIRE

    Maria,Alexandre Nízio; Murgas,Luis David Solis; Silva,Márcia Oliveira Barbosa; Miliorini,Alécio B.; Franciscatto,Renan T.; Logato,Priscila Vieira Rosa

    2004-01-01

    Atualmente, tem-se dado maior atenção ao desenvolvimento de tecnologias para estocagem de sêmen de peixes em curto prazo, por dias ou semanas, utilizando diluentes de sêmen que não ativem a motilidade espermática. Essa técnica é indicada em piscicultura para facilitar a reprodução artificial ou aumentar sua eficiência. Conduziu-se este trabalho com o objetivo de verificar o efeito do diluidor BTS (Beltsville Thawing Solution - MINITUB®) na qualidade do sêmen de pacu, após a coleta, enriquecid...

  15. ANÁLISIS ESTRUCTURAL DE FILETES SAJADOS DE HÍBRIDO DE CACHAMA Piaractus braquypomus x Colossoma macropomum UTILIZANDO BACTERIOCINAS PRODUCIDAS POR Lactobacillus plantarum LPBM10 EMPACADO AL VACÍO

    Directory of Open Access Journals (Sweden)

    Héctor Suárez M

    2008-08-01

    Full Text Available Objective. To determine microstructure, texture and sensory changes in cut cachama hybrid fillets. Materials and methods. Hybrid fillets that were vacuum packed for 30 days at 3°C were analyzed after preservative treatments by crude bacteriocins extract, lactic acid, and control by light microscopy. Results. Space among the muscle fibers increased gradually and the architectural arrangement was altered in all treatments throughout the entire storage period. The lowest alteration in connective tissue degradation and lowest increment in spaces between the muscular fibers was observed with the crude bacteriocin extract treatment. The instrumental textural analysis showed no statistical difference in the stability loss of tissues from fillets among treatments. Sensory analysis indicated that the lancing treatment was effective in diminishing the negative effect of intramuscular bones. The best scores were for cutting fillets with the bacteriocin treatment. Conclusions. The meat texture of fillets was affected during the storage period. Lancing is a procedure that enables the use of fillets without encountering the intramuscular bone problem. The use of crude bacteriocins extract prolongs the shelf-life of fillets.

  16. Substituição de alimento vivo por alimento inerte na larvicultura intensiva do tambacu (♀ Colossoma macropomum X ♂ Piaractus mesopotamicus - DOI: 10.4025/actascianimsci.v30i4.3835 Replacement of live food for inert food on larviculture of tambacu (♀ Colossoma macropomum X ♂ Piaractus mesopotamicus - DOI: 10.4025/actascianimsci.v30i4.3835

    Directory of Open Access Journals (Sweden)

    Levy de Carvalho Gomes

    2009-03-01

    Full Text Available Com este trabalho objetivou-se avaliar a substituição de náuplios de Artemia salina por alimentos inertes durante a larvicultura do tambacu. Na primeira fase, com duração de 12 dias, as larvas foram alimentadas com: náuplio de Artemia salina, cyclop-eeze e ovo de Artemia salina. Na segunda fase, com duração de dez dias, foram utilizadas larvas alimentadas com náuplios de Artemia salina provenientes da primeira fase e testados os mesmos três alimentos. A qualidade da água manteve-se em condições adequadas para a larvicultura nas duas fases. As larvas da primeira fase alimentadas com náuplios de Artemia salina obtiveram os melhores resultados em crescimento, sobrevivência e desempenho produtivo. Na segunda fase, o crescimento, a sobrevivência e o desempenho produtivo das larvas alimentadas com náuplios de Artemia salina e ovo de Artemia salina foram semelhantes. Nas duas fases, o custo com alimento foi mais baixo nas larvas alimentadas com náuplios de Artemia salina. Os resultados obtidos mostram que nas duas fases de larvicultura testadas a oferta de náuplios de Artemia salina é a melhor estratégia alimentar por proporcionar boa sobrevivência, crescimento e bom desempenho produtivo, além de menor custo.The aim of this work was to evaluate the replacement of Artemia salina nauplii by inert food during larviculture of tambacu. On the first phase with duration of 12 days, the larvae were fed with one of the following foods: Artemia salina nauplii, cyclop-eeze or Artemia salina egg. On the second phase, with 10 days of duration, larvae fed with Artemia salina nauplii were utilized in the first experiment and the same food treatments were tested. Water quality was adequate for larvae rearing in both phases. The larvae from the first phase that fed with Artemia salina nauplii presented better growth, survival rate and yield. On the second phase, the growth, survival and yield of larvae fed with Artemia salina nauplii and eggs were similar. On both phases, the food cost was lower for larvae fed with Artemia salina nauplii. The obtained results shown that on the two rearing phases the use of Artemia salina nauplii is the better feeding strategies, as the survival, growth, yield were greater than in the others treatments, and also showed the lower cost.

  17. Detección de Listeria monocytogenes en distintos productos alimenticios y en muestras ambientales de una amplia cadena de supermercados de la ciudad de Bahía Blanca (Argentina Listeria monocytogenes detection in different food products and environmental samples of supermarkets of Bahía Blanca city (Argentine

    Directory of Open Access Journals (Sweden)

    M.A. Marzocca

    2004-12-01

    Full Text Available En el período comprendido entre enero de 2002 y julio de 2003 se realizó este trabajo que consistió en la detección de Listeria monocytogenes en diferentes alimentos: 90 muestras de fiambres cocidos, fraccionados y envasados con diferentes metodologías y 132 muestras de queso de pasta blanda. Estos productos fueron analizados utilizando el criterio presencia-ausencia en 25 g de alimento. L. monocytogenes no se halló ni en los fiambres feteados en las ventas personalizadas ni en las muestras de queso analizadas. Por el contrario, se determinó su presencia en el 10% de los fiambres feteados envasados al vacío y en el 5% de los fiambres trozados envasados al vacío. Estos resultados nos llevaron a incluir la investigación de la presencia de este patógeno en diferentes muestras medioambientales. Para ello se hisoparon 115 puntos incluyendo las líneas de procesamiento, materias primas, utensilios, heladeras. L. monocytogenes se halló en el 13,2% de las muestras analizadas: 5% correspondieron a la sala de fraccionamiento de fiambres y lácteos, 6,7% al frigorífico y 1,5% a los sitios de venta personalizada. Estos resultados indicaron la posible existencia de sitios problemáticos donde el microorganismo tendría probabilidad de formar reservorios, por lo que se extremaron las medidas rutinarias de higiene y desinfección.This work on Listeria monocytogenes detection in different foods was carried out between January 2002 and July 2003. Ninety cold-served cooked meats, sliced and packaged by different methods and 132 pieces of soft cheeses were studied. These products were analyzed using the presence/ausence in 25 g criterion. L. monocytogenes was not found either in foods sliced over the counter or in controlled cheeses, but it was found in 10% of sliced cold-served foods and 5% of cut and cold-served meats vacuum packaged. These results led us to investigate the presence of these pathogen bacteria in different environmental samples. A hundred and fifteen points were swabbed including processing lines, raw materials, tools, and refrigerators. L. monocytogenes was found in 13.2% of the analyzed samples: 5% in packaging sector, 6.7% in meat processing lines and 1.5% in personalized sales. These results showed the presence of sites wherethe microorganismmay reside and create reservoirs, so that routinary measures of hygiene and disinfection were increased.

  18. Incertezas en la composición química del núcleo de las estrellas enanas blancas y su impacto en la astrosismología de estrellas variables ZZ Ceti

    Science.gov (United States)

    De Gerónimo, F. C.; Córsico, A. H.; Althaus, L. G.; Romero, A. D.

    2017-10-01

    ZZ Ceti stars are pulsating white dwarfs with a carbon-oxygen core built up during the core helium burning and thermally pulsing Asymptotic Giant Branch phases. Details about the origin and evolution of white dwarfs can be inferred through the interpretation of their pulsation periods by means of asteroseismology. The whole pulsation spectrum exhibited by ZZ Ceti stars is extremely sensitive to the inner chemical structure. We present a study of the impact of the current uncertainties of the white dwarf formation and evolution on the expected pulsation properties of ZZ Ceti stars. Our analysis is based on a set of carbon-oxygen core white dwarf models with masses 0.548 and 0.837M derived from full evolutionary computations from the ZAMS to the ZZ Ceti domain. We have considered models in which we varied the number of thermal pulses, the amount of overshooting, and the CO reaction rate within their uncertainties. We find that these uncertainties yield significant changes in the g-mode pulsation periods. We conclude that the uncertainties in the white dwarf progenitor evolution should be be taken into account in detailed asterseismological analysis of these pulsating stars.

  19. A study about the possible mining and benefit of the uranium ores of the ''Las Margaritas'' deposit, in Sierra de Pena Blanca, municipality of Villa Aldama, State of Chihuahua, Mexico

    International Nuclear Information System (INIS)

    Herrera, M.E.

    1976-01-01

    Considering all the characteristics of the deposit as well as its location in relation to the others, the necessary personnel, the extraction yield the structural conditions, etc. we can say that an advisable method of exploitation is the open pit method because in that way we can resolve a great number of problems, principally the high radiation to which the personnel would be exposed in a subterraneous work. The deposit reserves are 1,221,868 tons of ore with an average of 880 grams of U 3 O 8 per ton. During the exploitation at open pit 1,147,025 tons will be extracted and through subterraneous work other 50,406 tons will be recuperated. The exploitation will cost $84.00 Mexican currency per ton. According to the experimental studies about the mineral which will be treated it has been concluded that the conventional acid leaching is the appropriate treatment to be followed since the recoveries were of 88 to 95%. However, it is suggested to make more studies about the metallurgical aspect and industrial engineering studies in order to lower costs, since these are theoretical and can be improved in the practice. (author)

  20. El litigio entre las Brigadas Femeninas y la Liga Defensora de la Libertad Religiosa, durante la persecución callista a los cristeros, 1925-1929 (La masonería blanca

    Directory of Open Access Journals (Sweden)

    Héctor Díaz Zermeño

    2015-05-01

    Full Text Available Se muestra las diferencias y coincidencias entre las Brigadas Femeninas Cristeras y la Liga de los hombres que pretendían el liderazgo total en la lucha contra el gobierno mexicano anti cristero. El fin de esta triste historia fue el triunfo de los segundos en connivencia con la jerarquía católica, el gobierno y la intromisión norteamericana.

  1. EL DESARROLLO DE LAS CAPACIDADES LOCALES DE ACCIÓN A PARTIR DE LA IMPLEMENTACIÓN DE ESTRATEGIAS PARTICIPATIVAS. ESTUDIO DE CASO EN EL PRERIURBANO DE BAHIA BLANCA

    Directory of Open Access Journals (Sweden)

    María Prieto

    2008-12-01

    Full Text Available Las ciudades son en estos momentos los territorios en los cuales las transformaciones se expresan con una dinámica constante. Los procesos se aceleran, se multiplican los “encuentros”, y la ciudad se expande a través de los espacios periurbanos que cada una genera. Sin embargo, en los trabajos de investigación así como en el ámbito de la gestión municipal, suele ser un tema poco abordado e incluso ignorado. A su vez, es posible cuestionar que en el momento de diagramar la enseñanza de este tipo de conceptos en las aulas universitarias, como así también en los cursos de Postgrado, existe cierta tendencia a la utilización de métodos tradicionales, entre los cuales la exposición y explicación por parte del docente se convierten en las estrategias predominantes. De este modo, se configura un clima social de trabajo ausente de la interacción y cercenando, por lo tanto, la potencialidad de los alumnos en cuanto a sus aportes. Esto limita a los futuros egresados o a los profesionales en ejercicio de su actividad, la adopción de destrezas favorables para la participación en equipos de investigación y /o gestión para los cuales la activa participación y la reflexión crítica constante, se convierten en aptitudes necesarias en el campo laboral. En el presente trabajo se analiza la importancia de incorporar la dinámica de expansión de las ciudades a partir del análisis de los espacios periurbanos. A su vez, se intenta promover el replanteo y discusión del rol de las estrategias metodológicas en el aporte a la formación del pensamiento crítico del alumno-futuro profesional. Particularmente se aborda en esta experiencia los juegos de roles por su potencial formativo y aplicabilidad en las distintas profesiones para el desarrollo, en esta oportunidad, de las capacidades locales de acción. La experiencia tiene lugar con alumnos de un curso de Postgrado en el marco de la asignatura “Enfoques Geográficos sobre Agricultura Periurbana” en el marco de la Maestría PLIDER (Procesos Locales de Innovación y Desarrollo Local. La finalidad de la misma consiste en situar en un espacio de conflicto actores con sus distintos enfoques y formaciones frente a una problemática determinada: avance de la urbanización frente a las tierras hortícolas con un esquema de producción tradicional.

  2. Changes in cerebral white matter in pediatric acute lymphoblastic leukemia: a low incidence with a new therapeutic protocol; Alteracion de la sustancia blanca cerebral en la leucemialinfoblastica aguda pediatrica: baja incidencia con un nuevo protocolo terapeutico

    Energy Technology Data Exchange (ETDEWEB)

    Menor, F.; Marti-Bonmati, L.; Fortuno, J. R.; Verdeguer, A.; Castell, V.; Esteban, M. J. [Hospital Infantil La Fe. Valencia (Spain)

    2000-07-01

    The magnetic resonance (MR) assessment of changes in cerebral white matter in children with acute lymphoblastic leukemia (ALL) after the application of a new treatment. A prospective study was carried out in 50 consecutive children with ALL who had undergone MR imaging during the first 6 months after diagnosis. ALL was classified as standard risk (SR), high risk (HR) or very high risk (VHR) on the basis of conventional criteria. The major difference in the new protocol consisted in a phase of intensification in which different drugs are combined with dexamethasone in cases of HR ALL, together with the exclusion of cranial irradiation in a subgroup of HR patients. ALL the HR and VHR children with changes in white matter, as well as some of those in the SR group, underwent follow-up MR imaging. Thirty-two patients were classified as SR, 15 as HR and 3 as VHR. Changes were observed in 8% of cases (3 patients in the SR group and 1 in the HR group); all were neurologically asymptomatic. The lesions were hyperintense in protein density (PD) and T2-weighted images, with a frontal and occipital periventricular distribution in two cases and occipital in the other two. Serial follow-up images showed a reduction in the lesion in two cases and its persistence in one. The fourth patients died before follow-up images were achieved. There were no new changes in any of the patients. None of the children undergoing cranial irradiation (4 in the HR group and 2 in the VHR group) presented changes in white matter. The incidence of asymptomatic changes in white matter following central nervous system prophylaxis in children with ALL is lower than expected. The different chemoprophylactic protocol during the intensification phase probably protects against the development of these changes. Chemotherapy plays a predominant role in this type of iatrogenesis. (Author) 15 refs.

  3. Marco jurídico que controla el tráfico ilícito de migrantes y la trata de personas en Nicaragua. Estudio de caso: Puesto Fronterizo Peñas Blancas

    OpenAIRE

    Heydi José González Briones

    2007-01-01

    EN ESTE ARTÍCULO SE EXPONE UN ANÁLISIS DEL MARCO JURÍDICO – internacional y nacional – para combatir los delitos de tráfico ilícito de migrantes y trata de personas, que tienen lugar dentro del fenómeno de la migración irregular. Dicho análisis tiene como referencia las particularidades de la migración irregular dentro del territorio nicaragüense – como país emisor de migrantes y como zona de tránsito para migrantes extraregionales. En concreto, nos referimos a los flujos migratorios irregula...

  4. Marco jurídico que controla el tráfico ilícito de migrantes y la trata de personas en Nicaragua. Estudio de caso: Puesto Fronterizo Peñas Blancas

    Directory of Open Access Journals (Sweden)

    Heydi José González Briones

    2007-12-01

    Full Text Available EN ESTE ARTÍCULO SE EXPONE UN ANÁLISIS DEL MARCO JURÍDICO – internacional y nacional – para combatir los delitos de tráfico ilícito de migrantes y trata de personas, que tienen lugar dentro del fenómeno de la migración irregular. Dicho análisis tiene como referencia las particularidades de la migración irregular dentro del territorio nicaragüense – como país emisor de migrantes y como zona de tránsito para migrantes extraregionales. En concreto, nos referimos a los flujos migratorios irregulares que tienen lugar en la frontera sur de Nicaragua – Costa Rica. En esta frontera existen dos tipos de flujos migratorios: flujo sur-norte, que corresponde a migrantes extra-regionales que se dirigen hacia Estados Unidos y flujo sur-sur, que corresponde a la emigración de nicaragüenses hacia Costa Rica. Estos flujos irregulares son propicios para la comisión de los delitos de tráfico ilícito de migrantes y trata de personas, ambos considerados parte del crimen internacional organizado. A nivel internacional, los instrumentos legales vigentes tienen por objeto reconocer que la migración en sí misma no es delito y por tanto, no está sujeta a enjuiciamiento penal. Asimismo, enfatizan en el respeto de los derechos y protección de las víctimas e insisten en la no criminalización del migrante. A nivel nacional, en este artículo, nos referimos con especial atención a la Ley 240 -513,Ley de Control del Tráfico de Migrantes Ilegales y la aplicabilidad de dicha normativa frente a la realidad de la migración irregular: existencia de las redes de traficantes y tratantes de migrantes, el “coyotaje”, la falta de experticia policial y judicial para combatir estos delitos, la vulnerabilidad de la población migrante irregular e indocumentada, las deficiencias estructurales y las políticas migratorias que vulneran los derechos humanos de la población migrante.

  5. INFECCIÓN POR PROTOZOARIOS EN INDIVIDUOS DE TITÍ BEBE LECHE -S. fuscicollis-, TITÍ CABEZA BLANCA -S. oedipus-, TITÍ ARDILLA -S. sciureus-, SURICATO -S. suricatta- Y WALLABIE DE BENNETT -M. rufogriseus-: DESCRIPCIÓN DE CASOS

    Directory of Open Access Journals (Sweden)

    G. L. K. López

    2014-01-01

    Full Text Available La toxoplasmosis es una de las zoonosis parasitarias más comunes y de especial atención en medicina humana y veterinaria en todo el mundo. Toxoplasma gondii comparte mu - chos de sus parámetros biológicos con otros parásitos apicomplexa, pero es único por su extremadamente amplio rango de huéspedes y su especificidad tisular. La susceptibilidad en especies de primates del Nuevo Mundo y diprotodontos a la infección por protozoarios es alta. Bajo condiciones de cautiverio la toxoplasmosis es una de las infecciones más comunes en macrópodos australianos. En el presente trabajo se exponen los hallazgos clínicos y postmortem de 11 individuos de primates ( Saguinus oedipus, S. fuscicollis, Saimiri sciureus , carnívoros ( Suricata suricatta y diprotodontos ( Macropus rufogriseus , de la Fundación Zoológica de Cali, diagnosticados con toxoplasmosis mediante métodos paraclínicos e histopatológicos. En la mayoría de los casos el cuadro clínico se caracterizó principalmente por disnea, secreción nasal espumosa y signos neurológicos. Los hallazgos más importantes de la necropsia fueron lesiones en pulmón, hígado y encéfalo. Los casos aquí descritos corresponden a cuadros clínicos de ocurrencia natural y permiten entender el desarrollo fisiopatológico y la presentación clínica de las infecciones por protozoarios en especies de fauna silvestre, a pesar de la falta de un diagnóstico definitivo mediante técnicas específicas de inmunohistoquímica para las distintas etiologías.

  6. Intelectuales: cartas, redes e instituciones. El archivo epistolar del Colegio Libre de Estudios Superiores de Bahía Blanca en el cruce de la Historia y la Antropología (1941-1952)

    OpenAIRE

    López Pascual, Juliana

    2011-01-01

    En 1931, las preocupaciones de un grupo de intelectuales liberales dieron origen a la formación del Colegio Libre de Estudios Superiores (CLES) en la Capital Federal, quienes manifestaron interés en el desarrollo de lo que denominaron “cultura superior”. Entre sus prácticas más consolidadas se encontraron el dictado de cursos en “cátedras libres” y la edición de la revista Cursos y conferencias. Desde 1940, la dirección de la institución conformó sedes del CLES en ciudades del interior del pa...

  7. Influencia del contenido de silicio y el tratamiento térmico en la resistencia al desgaste de fundiciones blancas al cromo en condiciones de rápida solidificación

    Directory of Open Access Journals (Sweden)

    Goyos, L.

    2012-08-01

    Full Text Available The influence of silicon content and heat treatment on microstructure, abrasive and dry friction wear resistance of a 3 % C, 12 % Cr cast iron, under fast solidification conditions is studied. The fast solidification condition diminishes the carbide volume and the silicon content increases their dispersion and finesses. All matrixes obtained were perlitics, whit different finesses. No intermediate transformation products were noticed. Hardness had little variation. Austenization treatment show little affectivity, with tendency to increase wear in reference to as cast and maintenance treatments. Behavior under dry friction and abrasive wear were similar under test conditions applied whit more influence of carbide morphology in the abrasive wear conditions.

    Se estudia la influencia del silicio y el tratamiento térmico sobre la microestructura y la resistencia al desgaste abrasivo y por fricción seca de una fundición con 3 % C y 12 % Cr, obtenida en condiciones de rápida solidificación. La rápida solidificación disminuye el volumen de carburos, la finura y dispersión de éstos aumentan con el incremento del silicio. Todas las muestras presentaron matrices perlíticas, variando en finura con el tratamiento. No se apreciaron productos de transformación intermedios. Las durezas tuvieron poca variación. Los tratamientos de austenización mostraron poca efectividad, con tendencia a desgastes más elevados que en estado bruto de colada y con tratamiento de mantenimiento. Los comportamientos ante la abrasión y la fricción seca en las condiciones ensayadas fueron similares. Se evidenció alta influencia de la morfología de los carburos en el desgaste abrasivo.

  8. Modelización del diodo led, diseño y construcción de la inferfaz del transmisor y receptor para un sistema de comunicación de luz visible mediante un diodo de luz blanca

    OpenAIRE

    Peñaherrera Aguilar, Erick Alexander

    2014-01-01

    The purpose of the paper is to design the intensity modulator for SISO and MISO system. One SISO system is implemented by on-off modulation of visible light, making a point to point link. La finalidad del trabajo es diseñar el modulador de intensidad para un sistema SISO y MISO. Se implementó un sistema SISO por modulación de encendido y apagado por luz visible, realizando un enlace punto a punto.

  9. Application of the environmental isotopes to the hydrogeological study of the coastal sector in the Buenos Aires province, between Cabo San Antonio and Bahia Blanca. Final report for the period December 1984 - December 1989

    International Nuclear Information System (INIS)

    Panarello, H.O.

    1990-01-01

    Results and conclusions obtained under the framework of the 3995/RB research contract between the IAEA and the INGEIS with participation of the Dirreccion de Geologia, Mineria y Aguas Subterraneas (DGMAS) and the Centro Federal de Inversiones (C.F.I.) are presented. From the results the suitability of the isotope techniques for tracing hydrodynamic processes could be confirmed. Recharge condition also have been defined. The exceptional event of flood in the Buenos Aires province that begin in 1986 in connection with abnormal high precipitations targed infiltrating waters with the isotopical signal of the evaporation. This signal was found out in many of the sampled wells and allowed to recognize the recharge, even to significant depths. In the Pinamar and Villa Gesell towns, it was possible to establish the dynamic of wells under seasonal exploitation. In the most of cases water withdrawn in summer was recharged in the immediate precedent pluvious period. Refs, figs and tabs

  10. Cuando los socialistas gobernaron Bahía Blanca: la intendencia de Agustín de Arrieta (1932-1935) y el desafío de transformar la cultura política criolla

    OpenAIRE

    Cernadas, Mabel Nelida

    2016-01-01

    La producción historiográfica reciente sobre los años treinta ha señalado la complejidad y ambigüedades del proceso que se inicia con el derrocamiento de Hipólito Yrigoyen en setiembre de 1930 y desemboca en las elecciones de febrero de 1946, que dieron el triunfo a Juan Domingo Perón. La etapa se caracteriza por los múltiples y complejos conflictos por los que atravesó la sociedad argentina, y también porque ninguna de las agrupaciones políticas pudo articular las demandas de los diferentes ...

  11. Cuando los socialistas gobernaron Bahía Blanca (1932-1935) la intendencia de Agustín de Arrieta y el desafío de transformar la cultura política "criolla"

    OpenAIRE

    Cernadas de Bulnes, Mabel

    2013-01-01

    La producción historiográfica reciente sobre los años treinta ha señalado la complejidad y ambigüedades del proceso que se inicia con el derrocamiento de Hipólito Yrigoyen en setiembre de 1930 y desemboca en las elecciones de febrero de 1946, que dieron el triunfo a Juan Domingo Perón. La etapa se caracteriza por los múltiples y complejos conflictos por los que atravesó la sociedad argentina, y también porque ninguna de las agrupaciones políticas pudo articular las demandas de los diferentes ...

  12. Myoarchitecture and vasculature of the heart ventricle in some freshwater teleosts

    Science.gov (United States)

    Simões, K; Vicentini, CA; Orsi, AM; Cruz, C

    2002-01-01

    The morphological characteristics of the ventricular myocardium and of coronary vascularization were studied in three freshwater teleost species, Piaractus mesopotamicus,Colossoma macropomum and Clarias gariepinus (African catfish), by correlating their ventricular shapes and swimming habits. In Piaractus mesopotamicus and Colossoma macropomum, species with highly active swimming habits, the cardiac ventricle showed a pyramidal shape and a richly vascularized myocardium consisting of an outer compact layer and inner spongy layer. In Clarias gariepinus, aless active species, we observed a saccular ventricle with a mixed myocardium and coronary arteries, in contrast to the ventricular structure of other species described in the literature. PMID:12090393

  13. New host records and description of the egg of Anacanthorus penilabiatus (Monogenea, Dactylogyridae

    Directory of Open Access Journals (Sweden)

    MC Pamplona-Basilio

    2001-07-01

    Full Text Available Anacanthorus penilabiatus is referred parasitizing the type-host Piaractus mesopotamicus (Serrasalmidae and two new hosts, Colossoma macropomum and C. brachypomum (Characidae from fish ponds of "Departamento Nacional de Obras Contra as Secas", Pentecoste, State of Ceará, Brazil. Table of measurements and the first description of the egg are presented.

  14. Lluvia/A la mano izquierda/Mal cine

    OpenAIRE

    Pulido, Blanca Luz

    2016-01-01

    Llueve. Una suave indiferencia gotea desde el paisaje. Los colores, los recuerdos, retroceden un paso en la distancia. Lluvia total, gran silenciadora, inunda las ciudades de un nuevo mar sin nombres, sin cuerpos, sin memoria. 3 poemas por Blanca Luz Pulido Blanca

  15. Poemas de Leopoldo De La Rosa

    Directory of Open Access Journals (Sweden)

    Leopoldo de La Rosa

    1963-12-01

    Full Text Available El documento presenta los poemas del autor titulados: Canción del mar; Nocturno V; Nocturno IX; Nocturno XII; Nocturno XIV; Ncturno XV; Nocturno XVIII; Nocturno XX; Nocturno XXV; Nocturno XXVI; Viajar y Mujer Blanca

  16. Annual Report on Awards (1982). Graduate and Postdoctoral Fellowships, Postdoctoral Research Associateships.

    Science.gov (United States)

    1982-07-01

    Howard University Afro-American History Charles B. Thomas, Jr., Southern Methodist University Temple University Social Psychology Luz M. Umpierre...Behavioral Sciences Cultural Anthropology Blanca G. Silvestrini. University of Puerto Rico. Rio Piedras Harvard University History of Science Marvin

  17. 36 CFR 213.1 - Designation, administration, and development of National Grasslands.

    Science.gov (United States)

    2010-07-01

    ..., Power. Kansas Cimarron Morton, Stevens. Nebraska Oglala Dawes, Sioux. New Mexico Kiowa Colfax, Harding..., Golden Valley, McKenzie, Slope. Oklahoma Rita Blanca Cimarron. Oklahoma-Texas Black Kettle Roger Mills...

  18. Slope movements in Callejón de Huyalas, Peru

    Czech Academy of Sciences Publication Activity Database

    Vilímek, V.; Zapata, M. L.; Stemberk, Josef

    2003-01-01

    Roč. 35, supplementum (2003), s. 39-51 ISSN 0300-5402 Institutional research plan: CEZ:AV0Z3046908 Keywords : slope movements * natural hazards * Cordillera Blanca Subject RIV: DB - Geology ; Mineralogy

  19. Mining project of the Taja Margaritas

    International Nuclear Information System (INIS)

    Martinez A, O.

    1980-01-01

    A summary of the study of a mining project designed to determine the feasibility of open-pit mining in uranium deposits along the Pena Blanca mountain ridges in Taja Margaritas, is presented. (author)

  20. 78 FR 2239 - Endangered and Threatened Wildlife and Plants; Listing the Blue-Throated Macaw

    Science.gov (United States)

    2013-01-10

    ..., habillo, ceiba de leche, sandbox tree, possum wood, dynamite tree, ceiba blanca, assacu, and posentri) can... boxes. n 2009, in the Barba Azul Nature Reserve, 46 artificial nests were monitored, in part by video...

  1. 78 FR 61208 - Endangered and Threatened Wildlife and Plants; Listing the Blue-throated Macaw

    Science.gov (United States)

    2013-10-03

    ... leche, sandbox tree, possum wood, dynamite tree, ceiba blanca, assacu, and posentri) can reach more than... organizations are installing nest boxes. In 2009, in the Barba Azul Nature Reserve, 46 artificial nests were...

  2. Riita Oittinen, Blanca-Ana Roig Rechou (coords. (2016: A Grey Background in Children‘s literature: Death, Shipwreck, War, and Disasters - Literatura infantil y juvenil con fondo gris: muerte, naufragios, guerras y desastres. München: Iudicium Verlag; 327 pp.

    Directory of Open Access Journals (Sweden)

    Barbara Pregelj

    2016-12-01

    Full Text Available Los temas considerados tabú o difíciles llevan ganando terreno en la literatura infantil y juvenil desde los años noventa. También la crítica literaria, sobre todo los investigadores y los estudiosos de la literatura infantil y juvenil, ha percibido el fenómeno que se viene desarrollando sistemáticamente desde el inicio del siglo XXI. El monográfico A Grey Background in Children‘s literature: Death, Shipwreck, War, and Disasters - Literatura infantil y juvenil con fondo gris: muerte, naufragios, guerras y desastres es un buen ejemplo del intento de abarcar lo inabarcable, pues presta atención investigadora a un fenómeno simultáneo a sí mismo, lo que dificulta su trabajo. En primer lugar, porque a falta de distancia temporal, el corpus de los textos es incontrolable. Otra de las dificultades del trabajo con ‚la materia viva‘ es una posible falta de distanciamiento y dejarse influir por los autores, las editoriales, el mercado, etc. Todo esto hace que la reflexión crítica sea todavía más ardua, no obstante, también más necesaria, ya que requiere más valentía, conceptos críticos todavía más claros y una visión panorámica sobre un terreno difícilmente abarcable.

  3. Efecto de los métodos populares de cocción en el contenido de aflotoxinas en el maíz,(Zea Mays L.) Variedad I.C.A H.207 de coloración amarilla, (Zea Mayz LO.), variedad I.C.A H.253 de coloración blanca y frijol (Phoseolus vulgaris L.) cargamanto

    OpenAIRE

    Molina de Kocsis, Blanca

    1981-01-01

    Las micotoxinas son compuestos producidos por el metabolismo de algunos hongos. Dichos compuestos se caracterizan por ser tóxicos o por que pueden ocasiona otro tipo de efecto biológico sobre los organismo vivos.

  4. Summary of Synoptic Meteorological Observations (SSMO). South America and Selected Island Coastal Marine Areas, East Coast. Volume 2. Area 9-Rio de Janeiro, Area 10-Florianopolis, Area 11-Porto Alegre, Area 12-Buenos Aires, Area 13-Bahia Blanca, Area 14-Rawson, Area 15-Puerto Deseado, Area 16-Magellan Strain East.

    Science.gov (United States)

    1977-06-01

    DO VINO SMuD IV HOUR4 MS?I WIN SF5 5405 TOTALNoM CAC0N 1-5 4.10 1130,2-5 54 4 4 1AN FNTO 0f5S 00405 1.0 W. 45.46 55.0 9. .6 I toI .5 o 10.0 @90491 8.7...21IS9 732 2 OCT .4 46.0 9.2 10.3 52.0 22.2 9.1 3.9 1.2 100.0 3.6 90.0 011008 (OVIR-ALC 1965-1970 PC? PESO OF VINO SPEED f0752 AND0 DIRIC7t0’I VERSUS EA...0 .0 .0 .0 .0 .0 .0 .0 TOT PC? .1 1.6 1.1 .0 .0 .0 3.9 .1 2.1 1.9 .0 .0 .0 4.1 PACE 1) VAR04 AftA 0015 SAmtA ILAIKA CT Fa*of VINO SPHOS I nv OICTI00

  5. “Impacto de la evaluación ex post en la carrera departamental SM-102, tramo: San José de Sisa-Aguan Blanca-San Pablo-Empalme PE-5N (DV. Bellavista), Provincias de El Dorado y Bellavista, Región San Martín”

    OpenAIRE

    Encomenderos Dávalos, Danny Oldy

    2014-01-01

    This research raises aimed to evaluate the impact of investment Ex Post with the project intervention in rehabilitation and improvement of departmental road San José de Sisa - Bellavista. To achieve this purpose, we worked with a random sample of intentional type identified in 92 beneficiaries Area of Direct lnfluence of the project, between freight and passenger transport, Educational lnstitutions, Health lnstitutions, local authorities and boards of organizations Agricultura! Producers Th...

  6. Relationship between plant nutrition and severity of damage caused by white rot desease on onion (Allium cepa Relación entre la nutrición mineral y la severidad del daño ocasionado por pudrición blanca en cebolla de bulbo

    Directory of Open Access Journals (Sweden)

    Piraneque G Nelson Virgilio

    2006-12-01

    Full Text Available

    In a comercial onion crop (Allium cepa located in Tibasosa, Boyacá, Colombia, the relationship between plant nutrition and severity of damage caused by white rot disease was studied. The soil was classified as sulfic endoamept. At 20 days before sowing (DAS and at 45, 90 and 120 days after sowing soil samples and esclerotium were taken plant tissue analysis at 45, 90 and 120 DAS was carried out. Also association among soil chemical parameters and plant percentage of damage was estudied. Results showed direct relationship among cooper content in soil (r=0.71, nitrogen in leaves (r=0.46 and magnesium in leaves (r=0.66 with percentage o damage caused by S. cepivorum. Calcium content in leaves (r=0.52, boron in leaves (r=-0.49 and esclerocios in soil Elg (r=0.56 were inversely proportional to percentage of damage. The treatment with the highest percentage of damage had higher contents of N, P and S in leaves and lower K, Ca, Mg, B, Mn, Cu and Zn.

    Key words: Allium cepa; Sclerotium cepivorum; plant nutrition.

    En un cultivo comercial de cebolla de bulbo (Allium cepa situado en el municipio de Tibasosa, Boyacá-Colombia, se recolectaron muestras de suelos (sulfic endoaquepts yesclerocios 20 días antes de la siembra, 45, 90 y 120 días después de la siembra (DDS; los análisis de tejidos se realizaron a los 45, 90 y 120 DDS. Se determinó la asociación entre parámetros químicos del suelo y de la planta con el porcentaje de daño. Se estableció asociación directa entre las variables, contenido de cobre en suelo Cu (r=0.71, nitrógeno foliar Nf(r=0.46 y magnesio foliar Mgf (r=0.66 con el porcentaje de daño causado por S. cepivorum. El contenido de calcio foliar Caf (r=-0.52, boro foliar Bf (r=-0.49 y esclerocios por gramo de suelo ES/g (r=-0.56 fueron inversamente proporcionales con el porcentaje de daño. El tratamiento con mayor porcentaje de daño presentó contenidos altos de N, P y S en tejidos y menores contenidos en K, Ca, Mg, B, Mn, Cu y Zn.

    Palabras clave: Allium cepa; Sclerotium cepivorum; nutrición de las plantas; tolerancia.

  7. Evaluación preliminar del área de acción y patrón de actividad del venado cola blanca (Odocoileus virginianus, como parte de una alternativa de manejo ex situ en un bosque seco tropical (Cundinamarca, Colombia

    Directory of Open Access Journals (Sweden)

    Ángela Andrea Camargo Sanabria

    2005-01-01

    probablemente determinaron los movimientos y actividad de esta pareja de venados. Según las actitudes de 93 empleados y 331 turistas encuestados los aspectos positivos de este proyecto eran la oportunidad de brindar bienestar a los animales y su uso educativo; los obstáculos eran que pudieran escapar o morir. Finalmente, el semicautiverio es evaluado como una opción de manejo que permite alcanzar distintos objetivos y se hacen algunas recomendaciones para su implementación. La información obtenida enriqueció las experiencias de manejo de la especie.

  8. Influence of silicon content and heat treatment on wear resistance of white chromium cast irons under high speed solidification conditions; Influencia del contenido de silicio y el tratamiento termico en la resistencia al desgaste de fundiciones blancas al cromo en condiciones de rapida solidificacion

    Energy Technology Data Exchange (ETDEWEB)

    Goyo, L.; Varela, A.; Verhaege, M.; Garcia, A.; Mier, J.; Moors, M.

    2012-11-01

    The influence of silicon content and heat treatment on microstructure, abrasive and dry friction wear resistance of a 3 % C, 12 % Cr cast iron, under fast solidification conditions is studied. The fast solidification condition diminishes the carbide volume and the silicon content increases their dispersion and finesses. All matrixes obtained were perlitics, whit different finesses. No intermediate transformation products were noticed. Hardness had little variation. Austenization treatment show little effectivity, with tendency to increase wear in reference to as cast and maintenance treatments. Behavior under dry friction and abrasive wear were similar under test conditions applied whit more influence of carbide morphology in the abrasive wear conditions. (Author) 32 refs.

  9. The CMS team celebrates the arrival of the "Tube". From left to right, sitting: Blanca Perea Solano, Jeannine Muffat-Joly, Ariella Cattai (Tracker Technical Coordinator). Standing: Georges Roiron, Hans Postema, Eric Albert, Paolo Petagna, Arvid Larsson, Nuno Bernardino Rodrigues, Enzo Carrone, Jack Hill.

    CERN Multimedia

    Maximilien Brice

    2004-01-01

    CMS: Aerospace goes underground : gleaming aluminium on the outside and carbon black on the inside, as long as a sedan and taller than a man, a strange hollow cylinder arrived at CERN by truck August 26.

  10. Evaluation of methods to estimate the essential amino acids requirements of fish from the muscle amino acid profile

    OpenAIRE

    de Almeida Bicudo,Álvaro José; Possebon Cyrino,José Eurico

    2014-01-01

    Many methods to estimate amino acid requirement based on amino acid profile of fish have been proposed. This study evaluates the methodology proposed by Meyer & Fracalossi (2005) and by Tacon (1989) to estimate amino acids requirement of fish, which do exempt knowledge on previous nutritional requirement of reference amino acid. Data on amino acid requirement of pacu, Piaractus mesopotamicus, were used to validate de accuracy of those methods. Meyer & Fracalossi's and Tacon's methodol...

  11. Environmental Assessment: Transforming the 49th Fighter Wing’s Combat Capability, Holloman Air Force Base, New Mexico

    Science.gov (United States)

    2006-08-01

    aircraft. Lowering the floor of Cowboy ATCAA from 30,000 feet to 23,000 feet MSL would not affect civil aircraft, including those using Sierra Blanca ...with 49 FW transformation. Questions at scoping meetings included whether potential commercial service at the Sierra Blanca Airport could...of La Luz , Tularosa, Carrizozo, Capitan, Ruidoso, Ruidoso Downs, Cloudcroft, and Mescalero, low-density rural settlements in the Sacramento

  12. A incontinência urinária em mulheres e os aspectos raciais: uma revisão de literatura

    Directory of Open Access Journals (Sweden)

    Lígia da Silva Leroy

    2012-01-01

    Full Text Available Revisión de literatura cuyo objetivo fue identificar las asociaciones entre la incontinencia urinaria en las mujeres y los aspectos raciales. Se utilizaron las bases de datos MEDLINE y LILACS para investigar los artículos publicados en los años 2003 a 2010. Se analizaron 30 publicaciones que indicaron diferentes relaciones entre la incontinencia y la raza. La prevalencia de la incontinencia fue mayor entre las mujeres blancas. La incontinencia urinaria de esfuerzo fue más frecuente entre blancas y de urgencia entre negras. Blancas y asiáticas tenían pérdida urinaria en menor cantidad en comparación con las negras e hispanas. El impacto en la calidad de vida está más relacionada con la severidad de la pérdida de orina y otros factores, y no específicamente a la cuestión de la racial. Blancas tuvieron un mejor conocimiento acerca de la incontinencia y con mayor frecuencia fueron sometidos a tratamiento quirúrgico por la incontinencia urinaria de esfuerzo. Las blancas y latinas tienen mayor riesgo de incontinencia cuando comparadas con las negras y asiáticas. Se resalta la necesidad de estudios brasileños para que los datos puedan ser adecuados a nuestra realidad.

  13. La dimensión estremecida

    Directory of Open Access Journals (Sweden)

    Edgar O'Hara

    1993-09-01

    Full Text Available Llanto de la espada. Eduardo García Aguilar. Universidad Nacional Autónoma de México, México, 1992. 16 textos / Falso diario. Santiago Mutis Durán. Universidad del Valle, Colección "La Cierva Blanca", Cali, 1993, 72 págs. En alabanza del tiempo. Álvaro Rodríguez Torres. Universidad del Valle, Colección "La Cierva Blanca", Cali, 1993, 51 págs. El rey de los espantos. Víctor Manuel Gaviria. Universidad del Valle, Colección "La Cierva Blanca", Cali, 1993, 69 págs. La luna del dragón. William Ospina. Universidad del Valle, Colección "La Cierva Blanca" , Cali, 1993, 107 págs. En la posada del mundo. Fernando Herrera Gómez. Universidad del Valle, Colección "La Cierva Blanca", Cali, 1993, 81 págs. Piezas para la mano izquierda. Jaime Alberto Vélez. Universidad de Antioquia, Medellín, 1992.

  14. Histologia e ultraestrutura do rim e rim cefálico do pacu

    Directory of Open Access Journals (Sweden)

    Gerlane M. Costa

    2012-05-01

    Full Text Available O pacu, Piaractus mesopotamicus, é um teleósteo da Família Characidae, intensivamente cultivado no Brasil devido sua rusticidade, crescimento rápido e fácil adaptação. O conhecimento morfológico dos sistemas corpóreos, incluído órgãos linfóide, se faz necessário, para uma melhor produção no cultivo de peixes, fornecendo subsídios na manutenção dos estoques. O objetivo deste estudo foi descrever morfologicamente o rim e rim cefálico de Piaractus mesopotamicus, analisando os perfis celulares de cada órgão com o uso de microscopia de luz e microscopia eletrônica de transmissão. O resultado da análise macroscópica mostrou que a localização do rim e rim cefálico são as mesmas encontradas na maioria dos teleósteos. O rim apresentou uma forma em "H", onde a região média se expandia sobre a bexiga natatória. O rim cefálico se apresentou como uma dilatação na região cranial do rim, mostrando-se bem visível. Na microscopia eletrônica de transmissão também foram observadas similaridades ultraestruturais com outros teleósteos. Observando nossos resultados concluímos que histologicamente e ultraestruturalmente, os órgãos linfóides rim e rim cefálico de Piaractus mesopotamicus são similares aos de outros teleósteos.

  15. Recentes estudos de infecções parasitárias em peixes cultivados no Estado de São Paulo, Brasil Recent studies on parasitic infections of freshwater cultivated fish in the state of São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Andressa de Mello e Faro Conceição Paiva

    2002-04-01

    Full Text Available O presente trabalho relata os casos de doenças diagnosticadas em peixes no Estado de São Paulo, Brasil, entre janeiro/1999 e dezembro/2000. Durante o ano de 1999, os monogenéticos foram os parasitos mais importantes, com ocorrência de 72,9%, seguidos de Piscinoodinium pillulare (43,2%, Henneguya piaractus (34,2%, Ichthyophthirius multifiliis (23,4% e copepoditos de Lernaea cyprinacea (9,0%. No ano de 2000, os monogenéticos mostraram 78,9% de ocorrência, tricodinídeos 52,1%, P. pillulare 35,7%, I. multifiliis 29,8% e L. cyprinacea 11,9%. O peixe mais infectado foi Piaractus mesopotamicus, seguido de Leporinus macrocephalus, híbrido tambacu e Oreochromis niloticus. Este trabalho mostrou a maior susceptibilidade do tambacu e do L. macrocephalus ao P. pillulare e do P. mesopotamicus ao monogenético Anacanthorus penilabiatus. Os autores enfatizam a importância da profilaxia na criação, como o acompanhamento regular da saúde dos animais, aplicações de cloreto de sódio na água e suplementação com vitamina C para evitar o desequilíbrio do sistema hospedeiro/parasito/ambiente.The present work relates diagnosticated cases of fish diseases in the state of São Paulo, Brazil between January/1999 and December/2000. During 1999, the monogenean was the most important parasite (72.9%, followed by Piscinoodinium pillulare (43.2%, Henneguya piaractus (34.2%, Ichthyophthirius multifiliis (23.4% and copepodids of Lernaea cyprinacea (9.0%. However, in 2000, monogenean showed 78.9%, trichodinids 52.1%, P. pillulare 35.7%, I. multifiliis 29.8% and L. cyprinacea 11.9%. The most infected fish was Piaractus mesopotamicus, followed by Leporinus macrocephalus, hybrid "tambacu" and Oreochromis niloticus. This work showed the highest susceptibility of “tambacu” and L. macrocephalus to P. pillulare and P. mesopotamicus to monogenean Anacanthorus penilabiatus. The authors emphasize the importance of prophylaxis in farmed-fish, as well as adequate

  16. Diâmetro do ingrediente e a digestibilidade aparente de rações por duas espécies de peixes tropicais Ingredient diameter and apparent digestibility of diet by two tropical fish species

    OpenAIRE

    Margarida Maria Barros; Luis Gabriel Quinteiro Pinto; Wilson Massumitu Furuya; Edma Carvalho de Miranda; Luiz Edivaldo Pezzato; Guilherme Jordão Magalhães Rosa

    2002-01-01

    Este estudo foi realizado no Laboratório de Pesquisas em Nutrição de Organismos Aquáticos, da FMVZ - Unesp Campus de Botucatu, Estado de São Paulo, unidade integrada ao Centro de Aquicultura da Unesp. Teve por objetivo avaliar a influência do diâmetro do ingrediente alimentar (0,5; 1,0; 1,5; 2,0 e 2,5 mm), por meio da digestibilidade aparente de rações pela tilápia do Nilo, Oreochromis niloticus L. (Perciformes cichlidae), e pelo pacu, Piaractus mesopotamicus (Holmberg) Characiformes, Characi...

  17. Aplicación clínica de las imágenes de resonancia potenciadas en difusión y tractografía en un niño con holoprosencefalia

    Directory of Open Access Journals (Sweden)

    Blair Ortiz

    2011-03-01

    Presentamos un paciente con holoprosencefalia semilobar en quien la imagen potenciada en difusión y la tractografía demostró falla de la inducción ventral del prosencéfalo y fusión anormal de varios fascículos de la sustancia blanca en el cerebro y en el tallo encefálico. De esta forma, las anormalidades de los fascículos de la sustancia blanca en casos de holoprosencefalia se pueden identificar por medio de las imágenes potenciadas en difusión y tractografía fasciculografía.

  18. Isolation and characterization of Flavobacterium columnare (Bernardet et al. 2002) from four tropical fish species in Brazil.

    Science.gov (United States)

    Pilarski, F; Rossini, A J; Ceccarelli, P S

    2008-05-01

    Flavobacterium columnare is the causative agent of columnaris disease in freshwater fish, implicated in skin and gill disease, often causing high mortality. The aim of this study was the isolation and characterization of Flavobacterium columnare in tropical fish in Brazil. Piracanjuba (Brycon orbignyanus), pacu (Piaractus mesopotamicus), tambaqui (Colossoma macropomum) and cascudo (Hypostomus plecostomus) were examined for external lesions showing signs of colunmaris disease such as greyish white spots, especially on the head, dorsal part and caudal fin of the fish. The sampling comprised 50 samples representing four different fish species selected for study. Samples for culture were obtained by skin and kidney scrapes with a sterile cotton swabs of columnaris disease fish and streaked onto Carlson and Pacha (1968) artificial culture medium (broth and solid) which were