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Sample records for cachama negra colossoma

  1. INFLUENCIA DE BACTERIOCINAS PRODUCIDAS POR Lactobacillus plantarum LPBM10 SOBRE LA VIDA ÚTIL DE FILETES DEL HÍBRIDO DE CACHAMA Piaractus brachypomus x Colossoma macropomum EMPACADO AL VACÍO: INFLUENCE OF BACTERIOCINS PRODUCED BY Lactobacillus plantarum LPBM10 ON SHELF LIFE OF CACHAMA HYBRID FILLETS Piaractus rachypomus x Colossoma macropomum VACUUM PACKAGED

    OpenAIRE

    Héctor SUÁREZ M.; Alicia DE FRANCISCO; Luiz H. Beirão

    2008-01-01

    El uso de algunos de los géneros de las bacterias ácidolácticas (BAL) como Lactobacillus, Leuconostoc, Lactococcus, o sus productos antimicrobianos como las bacteriocinas, son alternativas en la biopreservación de productos mínimamente procesados que son mantenidos bajo refrigeración. El potencial de biopreservación de un extracto crudo de bacteriocinas producidas por una cepa nativa de Lactobacillus plantarum LPBM10, se evalúa sobre filetes de híbrido de cachama Piaractus brachypomus x Colos...

  2. [Composition and stability of fatty acids from deboned cachama and sardine meat during freezer storage].

    Science.gov (United States)

    Ortíz, H; Bello, R

    1992-12-01

    Free fatty acids from total lipids and phospholipids in minced fish flesh from three sizes of Cachama (Colossoma macropomum) and Sardine (Sardinella anchovia) were evaluated. Cachama's most abundant unsaturated fatty acids from the total lipid fraction were: C18:1 (31-38%); C18:2, n-6 (13-15%); and C20:4, n-6 (3-5%), while in sardine were the follows: C18:1; C20:5 n-3 (12-24%) and C22: 6,n-3 (7-24%). C20:5, n-3 increased with the size and C22:6,n-3 decreased. The variance analysis indicated that percentage of polyunsaturated fatty acids of n-6 series in the total lipids of cachama and n-3 series in sardine were affected by the storage temperature from -10C to -20 degrees C (p < 0.01). Storage time had effect on the stability of sardine fatty acids (p-0.01) and cachama (p < 0.05). Sardine minced flesh presented the highest value of free fatty acids at-10 degrees C during the second month of storage (620 mg%) while cachama at the fourth month (230 mg%). TBA- value in sardine increased at -10 degrees C from 5.5 to 23 mg of malonaldehyde in fourth months while in cachama these value were almost the same (2-6 mg-kg) during the storage period at -10 degrees C and -20 degrees C. PMID:1342185

  3. ANÁLISIS ESTRUCTURAL DE FILETES SAJADOS DE HÍBRIDO DE CACHAMA Piaractus braquypomus x Colossoma macropomum UTILIZANDO BACTERIOCINAS PRODUCIDAS POR Lactobacillus plantarum LPBM10 EMPACADO AL VACÍO

    OpenAIRE

    Héctor Suárez M; Sandra Pardo C; Misael Cortes R

    2008-01-01

    Objetivo. Determinar los cambios microestructurales, texturales y sensoriales de filetes sajados de híbrido de cachama. Materiales y métodos. Filetes empacados al vacío y sometidos a refrigeración durante 30 días a 3ºC fueron analizados bajo tres tratamientos de preservación; extracto crudo de bacteriocinas, acido láctico y control por medio de microscopia de luz. Resultados. El espacio entre las fibras musculares fue aumentando gradualmente y el arreglo arquitectónico fue alterado a lo largo...

  4. 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.

  5. Relation between metallothionein, RNA/DNA and heavy metals in juveniles of colossoma macropomun (Cuvier, 1818) in natural conditions

    OpenAIRE

    Lemus M.; Blanco I; Hernández M.; León A; Centeno L.; Chung K.; Salazar-Lugo R.

    2013-01-01

    Metal content, Metallotionein and physiological condition (RNA/DNA ratio) were analyzed in Cachama, Colossoma macropomum from the Orinoco River. Juvenile samples were dissected and one gram of white muscle gills, kidney and liver was taken. Cu, Cd, Pb, Ni and Fe were analyzed by atomic absorption spectrophotometer using TORT and LUTSI as reference material. Metallothioneins were determined with Ellman´s reagent and RNA/DNA ratio was analyzed by fluorometric method. Results showed that Cd, Cu,...

  6. Fauna ectoparasitaria asociada a colossoma macropomum y al híbrido de c. macropomum x piaractus brachypomus, cultivados en el estado delta Amacuro, Venezuela Ectoparasitic fauna associated to Colossoma macropomum and to the hybrid of C. macropomum x Piaractus brachypomus, cultivated in Delta Amacuro State, Venezuela

    OpenAIRE

    Luisa Centeno; Annie Silva-Acuña; Ramón Silva-Acuña; José Luis Pérez

    2004-01-01

    En Venezuela, con el incremento y expansión del cultivo de peces autóctonos, ha aumentado también la importancia por identificar las enfermedades parasitarias que pueden afectar estas especies bajo condiciones de cultivo. Con esa finalidad, se realizó esta investigación cuyo objetivo fue determinar la fauna ectoparasitaria presente en la cachama (Colossoma macropomum) y en el híbrido cachama x morocoto (C. macropomum x Piaractus brachypomus) bajo condiciones de cultivo. Los muestreos se reali...

  7. Paraquat and temperature affect nonspecific immune response of Colossoma macropomum.

    Science.gov (United States)

    Salazar-Lugo, Raquel; Estrella, América; Oliveros, Aridays; Rojas-Villarroel, Evelyn; Villalobos de B, Luz; Lemus, Mairin

    2009-05-01

    This study evaluated the effect of paraquat (PQ) and temperature on hematological parameters and nonspecific immune system of fish Colossoma macropomum (Cachama). Juveniles were used for all experiments. Fish were exposed to three temperatures (18, 28, 35°C) and 10mg/L PQ during 21 days (PQ LC(50) 96h was of 48.05mg/L). Hematological (Hb, Ht, VCM, HCM and CHCM and RBC) and immunological parameters (WBC, differential count of white cells, phagocytes, and bacterial killing by phagocytes) were analyzed for 7, 14 and 21 days. Fishes PQ exposed at 18°C decreased Hb, MCH and MCHC; we observed sickle erythrocytes in control group at 18°C, and in PQ-exposed groups at 18 and 35°C. Immunological parameters were not affected by temperature. Neutrophils decreased significantly in all PQ-exposed groups. Bacterial killing by phagocytes decreased in 18 and 35°C PQ-groups; a synergistic interaction was shown between PQ and temperature on WBC and lymphocytes. These results indicate that PQ affected neutrophils counts independently of temperature exposure; the temperature exerted a synergistic effect on PQ toxicity in lymphocyte counts and phagocytic response and besides nonspecific immune response, PQ and temperature affects hematological parameters such as Hb, MCH, MCHC and erythrocytes morphology. PMID:21783960

  8. The Viuva Negra crawler

    OpenAIRE

    Gomes, Daniel; Silva, Mário J.

    2006-01-01

    This report discusses architectural aspects of web crawlers and details the design, implementation and evaluation of the Viuva Negra (VN) crawler. VN has been used for 4 years, feeding a search engine and an archive of the Portuguese web. In our experiments it crawled over 2 million documents per day, correspondent to 63 GB of data. We describe hazardous situations to crawling found on the web and the adopted solutions to mitigate their effects. The gathered information was integrated in a we...

  9. RNA/DNA ratio as an index of physiological condition of Colossoma macropomum and Piaractus brachypomus (Pisces : Characiformes) during embryonic development

    International Nuclear Information System (INIS)

    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. (Author)

  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. PMID:15264559

  11. 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

    OpenAIRE

    Héctor Suárez Mahecha; Sandra Clemencia Pardo Carrasco; Misael Cortés Rodríguez; Sandra Catalina Ricaurte; Benjamín Rojano

    2009-01-01

    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 p...

  12. Ecologia Molecular de leveduras negras

    OpenAIRE

    Nascimento, Mariana Machado Fidelis do

    2013-01-01

    Resumo: As leveduras negras são Ascomicetos cuja principal característica é a pigmentação escura na parede celular das células vegetativas e reprodutivas, e pertencem às ordens Dothideales e Chaetothyriales. O oligotrofismo destes agentes os torna hábeis a sobreviver em diversos substratos. Sendo assim, estudos da ecologia destes agentes são de fundamental importância para o entendimento da evolução epidemiológica das doenças causadas por estes micro-organismos. O presente trabalho teve como ...

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

    OpenAIRE

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

    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 ...

  14. 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.

  15. 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.

  16. 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

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

    OpenAIRE

    Miguel Ángel Mendoza R.; Jair Comas Corredor; Clara Stefany Romero Hurtado

    2013-01-01

    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...

  18. 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...

  19. EU MENINA NEGRA – REFLEXÕES PÓS-SIMPÓSIO SER NEGRA

    OpenAIRE

    Zora Yonara Torres Costa

    2014-01-01

    Este ensaio é o resultado do trabalho apresentado no Seminário Sernegra, em 2013, que foi organizado pelo Instituto Federal de Brasília – IFB. Propõe refletir se é possível uma pessoa negra viver, diante do racismo no modelo de sociedade vigente. Sendo assim, a abordagem teórico-metodológica utilizada neste trabalho foi catalogar casos de racismo e fazer uma reflexão acerca da violação de direitos das pessoas negras. Destaca-se que as ações afirmativas da Universidade de Brasília – UNB regist...

  20. Toxicity of atrazine herbicide in "Colossoma macropomum" Toxicidade do herbicida atrazina em "Colossoma macropomum"

    OpenAIRE

    Jeane Alves Almeida; Fabio de Jesus Castro; Paulo Frederico Garcia Chapadense; Sandro Estevan Moron

    2009-01-01

    The present study aimed to investigate the toxicity of the herbicide GESAPREME, belonged to the Triazines group (the active principle is atrazine = 500gL-1), on the juveniles of the fish species Colossoma macropomum (tambaqui). For this purpose, the LC50 and the frequency of micronuclei (MN) in erythrocytes were determined. Fish mortality increased together with the increment in water GESAPREME concentrations. The value of LC50 (96h) was reached in the concentration of 20 mg L-1. After 48h of...

  1. 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

  2. Laju Pertumbuhan Populasi Ikan Bawal Air Tawar (Colossoma Macropomum) Dengan Pemberian Pakan Alami Dan Buatan Serta Kombinasinya

    OpenAIRE

    Sitanggang, Ledi D

    2014-01-01

    It has been done the research about the growth rate of Colossoma macropomum population with different of feed. The purpose of this research is to know the better feed for the increasing of Colossoma macropomum population, the growth of Colossoma macropomum patterns and survival of Colossoma macropomum life. This research use an experiment method with the pattern completely randomized design with 3 treatments and 3 replications and maintained for 12 weeks in the aquarium with th...

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

    OpenAIRE

    Oscar García; Iria Acevedo; Jorge Ruiz Ramírez

    2013-01-01

    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) ...

  4. Ausencia de mujeres negras en los estudios sobre discapacidades humanas

    OpenAIRE

    Mena Ortiz, Luz Zaret

    2012-01-01

    Una investigación intencionalmente organizada para dar cuenta de la realidad vivida por las mujeres negras en situación de discapacidad pasa por rescatar el pensamiento y el activismo de las mujeres en el movimiento afro en la medida en que dicho movimiento, tan diverso en su accionar como en sus registros y alcances históricos, ha sido elaborado al vaivén de los debates locales, nacionales e internacionales centrados en la cuestión étnico-racial negra, afrodescendiente, palenquera y raizal. ...

  5. 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.

  6. EU MENINA NEGRA – REFLEXÕES PÓS-SIMPÓSIO SER NEGRA

    Directory of Open Access Journals (Sweden)

    Zora Yonara Torres Costa

    2014-06-01

    Full Text Available Este ensaio é o resultado do trabalho apresentado no Seminário Sernegra, em 2013, que foi organizado pelo Instituto Federal de Brasília – IFB. Propõe refletir se é possível uma pessoa negra viver, diante do racismo no modelo de sociedade vigente. Sendo assim, a abordagem teórico-metodológica utilizada neste trabalho foi catalogar casos de racismo e fazer uma reflexão acerca da violação de direitos das pessoas negras. Destaca-se que as ações afirmativas da Universidade de Brasília – UNB registraram dados que demonstram a importância das cotas raciais, pois nos últimos quatro anos, cerca de 41% dos novos alunos e alunas que ingressaram na UNB são negros e negras. Existe também uma pesquisa realizada em 2010 pela Rede de Informação Tecnológica Latino-Americana – RITLA, com quase dez mil estudantes de escolas públicas do Distrito Federal, que demonstrou que infelizmente o racismo impera e é naturalizado no espaço da escola. Cerca de 55,7% dos alunos admitiram ter assistido a situações de discriminação racial dentro do colégio. O presente trabalho também propõe refletir sobre as violações de direitos, como racismo, as implicações em relação à exploração sexual e trabalho infantil, e estabelecer um debate da atuação dos IF’s nesta desconstrução do racismo por meio da educação.Palavras-Chave: Criança Negra; Racismo; Identidade; Violência. Abstract:This essay is the result of the work presented at the Being Black Seminar in 2013, which was organized by the Federal Institute of Brasilia - IFB. It proposes to reflect whether it is possible for a black person to live with the racism of the current social model. Thus, the theoretical-methodological approach used in this work was cataloging the racism cases and making a reflection about the violation of the black people’s rights. It is noteworthy that affirmative actions at the University of Brasilia - UNB reported data that demonstrate the

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

    OpenAIRE

    Pedro Eslava M; Hover Vidal B; Iang Rondón B; Wilson Ramírez D

    2009-01-01

    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....

  8. Desarrollo de metodología para la determinación de la digestibilidad de materias primas no convencionales en cachama blanca Piaractus brachypomus

    OpenAIRE

    Clavijo Restrepo, Laura Cristina

    2011-01-01

    Este trabajo pretendió, adaptar la metodología de stripping (masaje abdominal), para recolectar heces fecales de Cachama blanca Piaractus brachypomus, y determinar la digestibilidad fecal aparente de combinaciones de cuatro materias primas no convencionales: caupí, bore, zapallo y yuca, en cuatro dietas, con un diseño experimental de bloques completos al azar, en la Granja Académica y Experimental El Cairo, de la Universidad Nacional de Colombia Sede Orinoquia, en Arauca (Arauca). Durante su ...

  9. Oocyte quality of tambaqui (Colossoma macropomum) during the reproductive season.

    Science.gov (United States)

    Galo, J M; Ribeiro, R P; Streit-Junior, D P; Albuquerque, D M; Fornari, D C; Roma, C F C; Guerreiro, L R J

    2015-05-01

    The study aimed to analyze the Colossoma macropomum reproductive behavior and quality of the female gametes throughout the reproductive season. The experiment was carried out in Pimenta Bueno - Rondônia State (Northern Brazil) during the reproductive season (2010-2011) using 36 females. Each sampling was performed on a 15 ± 5 days interval. Female gametes were collected by stripping and the following analyses were performed: weight of oocytes released (g); productivity index, fertilization and hatching rate. During the sampling period was verified effect (p macropomum oocytes. PMID:26132008

  10. Transportation of juvenile tambaqui (Colossoma macropomum) in a closed system Transporte de juvenis de tambaqui (Colossoma macropomum) em sistema fechado

    OpenAIRE

    L.C. Gomes; C. A. R. M. Araujo-Lima; A. R. CHIPPARI-GOMES; Roubach, R.

    2006-01-01

    The objective of this study was to investigate the effect of density, duration and the use of additives to the water during the transportation of juvenile tambaqui (Colossoma macropomum) and use of this data to establish a safe transportation protocol for the species. The tested products and dosages were: salt (1000, 2000 and 3000 mg/L), gypsum (100, 300 and 500 mg/L) and benzocaine (10, 20 and 30 mg/L). Fish were transported in closed systems (plastic bag) at different densities and time per...

  11. Diversidade genética de estoques de reprodutores de Colossoma macropomum Genetic diversity of Colossoma macropomum broodstocks

    OpenAIRE

    T.S. Lopes; D.P. Streit Jr.; R.P. Ribeiro; J.A. Povh; N.M. Lopera-Barrero; L. Vargas; C. Pinto Filho; J.R. Queiroz

    2009-01-01

    Analisou-se a diversidade genética de estoques de reprodutores de Tambaqui (Colossoma macropomum), mediante o uso de marcador RAPD, utilizando-se 10 primers para analisar 30 amostras do estoques de reprodutores das pisciculturas de Boa Esperança e Vale Verde, localizadas no Estado de Rondônia. A porcentagem de fragmentos polimórficos e o índice de diversidade genética de Shannon foram altos nos dois estoques de reprodutores. O estoque de reprodutores de Boa Esperança apresentou um fragmento e...

  12. Migración negra en Santa Marta

    Directory of Open Access Journals (Sweden)

    Josè Luis Vega de Lavalle

    2013-11-01

    Full Text Available El objetivo de este artículo es dar cuenta de los procesos e inserción urbana de la Gente Negra  se ha instalado en Santa Marta, los cuales han llegado a partir de la década de los años ochenta a  en el sector turístico de esta ciudad.

  13. Diversidade genética de estoques de reprodutores de Colossoma macropomum Genetic diversity of Colossoma macropomum broodstocks

    Directory of Open Access Journals (Sweden)

    T.S. Lopes

    2009-06-01

    Full Text Available Analisou-se a diversidade genética de estoques de reprodutores de Tambaqui (Colossoma macropomum, mediante o uso de marcador RAPD, utilizando-se 10 primers para analisar 30 amostras do estoques de reprodutores das pisciculturas de Boa Esperança e Vale Verde, localizadas no Estado de Rondônia. A porcentagem de fragmentos polimórficos e o índice de diversidade genética de Shannon foram altos nos dois estoques de reprodutores. O estoque de reprodutores de Boa Esperança apresentou um fragmento exclusivo. A diferenciação genética foi baixa e o número de migrantes por geração foi alto entre os estoques de reprodutores. O dendrograma não separou os indivíduos dos estoques de reprodutores em grupos distintos. Há alta variabilidade genética nos estoques de reprodutores, um pouco inferior no estoque de Vale Verde, e há grande proximidade genética entre os indivíduos dos estoques de reprodutores.The genetic diversity of tambaqui (Colossoma macropomum broodstocks from two hatchery station in Rondônia State was studied by the RAPD marker. Ten primers were used to analyze 30 broodstocks samples from the hatchery stations of Boa Esperança and Vale Verde. The polymorphic fragments percentage and Shannon genetic diversity index were high in the two broodstocks. The Boa Esperança broodstock presented an exclusive fragment. The genetic differentiation was low and the number of migrants per generation was high among the broodstocks. The dendrogram did not separate the broodstocks individuals in different groups. The results indicate a high genetic variability in the broodstocks, being a little bit lower in the Vale Verde broodstock. Besides, there is a genetic proximity among the broodstocks.

  14. Three-dimensional Q for Sierra Negra volcano, Galapagos

    Science.gov (United States)

    Young, B. E.; Lees, J. M.; Ebinger, C. J.

    2012-12-01

    Galapagos Islands volcanoes are some of the most rapidly deforming volcanoes on Earth, yet the magma storage chambers and migration pathways are poorly imaged. Three-dimensional tomographic inversion for seismic attenuation, 1/Q, is used to image variations in subsurface structure and heterogeneity associated with magma storage and volcanic construction at Sierra Negra volcano, Galapagos Islands. P-wave power spectra were used to estimate t* (attenuation weighted, integrated slowness) in the frequency domain for local earthquakes recorded on the 15 station, broadband SIGNET array. The SIGNET network was deployed around Sierra Negra caldera and the southern part of Isabela Island between August 2009 and January 2011. A subset of 451 earthquakes was selected for attenuation analysis based on event location within the array and station coverage. The modelled spectra were used to calculate path attenuation and earthquake source parameters. The earthquake source parameters corresponding to amplitude at zero frequency (Ω0) and corner frequency (fc) relate to earthquake size and are therefore set constant across stations. Accordingly, we derive a single Ω0 and fc for each event and fix them while allowing only t* to vary. Values of t* range between 8.89 x 10-15 and 0.0525. Preliminary results show an increase in attenuation beneath the caldera starting at 1 km depth. The zone of high attenuation is more pronounced at 2 km depth and extends laterally to the east and southeast beyond the extent of the 10 km-wide caldera. Gravity anomaly and InSAR data has been used previously to model the magma chamber at Sierra Negra. Deformation modelling requires a flat-topped sill at 2 km depth (Geist et. al., 2007; Jonsson, S., 2009; Yun et. al., 2006). Our shallow, high attenuation zone matches these results, but also indicates that the attenuating bodies extend beyond the limits of the caldera beneath the SE flank of Sierra Negra. Elongate zones of higher attenuation correlate with

  15. Transportation of juvenile tambaqui (Colossoma macropomum) in a closed system.

    Science.gov (United States)

    Gomes, L C; Araujo-Lima, C A R M; Chippari-Gomes, A R; Roubach, R

    2006-05-01

    The objective of this study was to investigate the effect of density, duration and the use of additives to the water during the transportation of juvenile tambaqui (Colossoma macropomum) and use of this data to establish a safe transportation protocol for the species. The tested products and dosages were: salt (1000, 2000 and 3000 mg/L), gypsum (100, 300 and 500 mg/L) and benzocaine (10, 20 and 30 mg/L). Fish were transported in closed systems (plastic bag) at different densities and time periods of up to 24 h. Fish survival (FS) and water quality parameters were monitored immediately after transportation. The remaining fish were kept in floating cages in order to evaluate mortality which occurred up to 96 h after transportation (S96). The best fish density, additives dosages and time period of the transportation was estimated with a general linear model. The effect of the condition factor on FS and S96 was also evaluated. As expected, FS and S96 were significantly related to time and density. FS but not S96, were also were significantly related to treatment. FS with gypsum treatment was not different from controls and FS with table salt and benzocaine treatments were significantly reduced. The condition factor was not related to either FS or S96. FS was inversely correlated with carbon dioxide concentration. It was concluded that the additives did not improve fish transportation survival. Linear models were developed to predict the best transportation densities as a function of time. PMID:16862304

  16. Hormonal induction and semen characteristics of tambaqui Colossoma macropomum.

    Science.gov (United States)

    Maria, Alexandre Nizio; Azevedo, Hymerson Costa; Santos, Jadson Pinheiro; Carneiro, Paulo César Falanghe

    2012-02-01

    In the hatchery-bred tambaqui Colossoma macropomum, spontaneous semen release does not occur, and hand-stripping produces reduced semen volume. The goal of this work is to evaluate the effects of hormonal induction with carp pituitary extract (CPE) on both qualitative (visual aspect, pH, motility, viability and morphological abnormalities) and quantitative (volume, concentration and number of spermatozoa per ejaculate) traits of tambaqui semen. Eleven males were treated with CPE (induced), and 11 were left untreated as a control (non-induced). All analysed parameters except motility and percentage of viable spermatozoa presented significant differences (p < 0.05) between the induced and non-induced treatments. CPE induction resulted in a 25-fold increase in semen volume and a 10-fold increase in the number of spermatozoa collected. However, both sperm concentration and the frequency of sperm with morphological abnormalities (commonly detached heads or bent tails) were significantly lower in CPE-induced fish. The hormonal induction of tambaqui males with CPE is efficient and positively influences some qualitative and quantitative properties of semen. Additionally, semen collection via gentle abdominal massage occurs more readily in CPE-induced fish. PMID:21208496

  17. Myxobolus sp. (Myxozoa) in the circulating blood of Colossoma macropomum (Osteichthyes, Characidae) Myxobolus sp. (Myxozoa) no sangue circulante de Colossoma macropomum (Osteichthyes, Characidae)

    OpenAIRE

    Patricia Oliveira Maciel; Elizabeth Gusmão Affonso; Cheila de Lima Boijink; Marcos Tavares-Dias; Luis Antonio Kioshi Aoki Inoue

    2011-01-01

    Myxosporea parasitize many organs in fresh and saltwater fish. Species of the genus Myxobolus parasitizing the gills and other organs of the tambaqui Colossoma macropomum have been described. In the present study, blood smears were made from juvenile tambaqui and were stained with May Grunwald-Giemsa-Wright in order to identify myxozoan parasites. Out of a total of 36 fish examined, one specimen (2.7%) that was reared in a cage presented spores that were identified as M. colossomatis, whereas...

  18. Methods of cryopreservation of Tambaqui semen, Colossoma macropomum.

    Science.gov (United States)

    Varela Junior, A S; Goularte, K L; Alves, J P; Pereira, F A; Silva, E F; Cardoso, T F; Jardim, R D; Streit, D P; Corcini, C D

    2015-06-01

    This study compared three different techniques for sperm cryopreservation of Tambaqui (Colossoma macropomum). Semen was diluted in Beltsville Thawing Solution with the addition of dimethyl sulfoxide (DMSO) at various concentrations (5%, 10%, 15% and 20%). Cryopreservation was performed using three methods: Box Conditioner Method with straws at a 5 cm distance from liquid nitrogen vapor (N2L); Dry Shipper Method placing the straws inside the machine; Vitrification Method placing the straws directly into N2L, amounting to 12 treatments (four DMSO concentrations×three freezing methods). The samples were evaluated for analysis of sperm quality in vivo and in vitro. Use of the Vitrification Method at different concentrations of DMSO provided the least values in the different evaluations. Fertilization, hatching rates and plasma membrane integrity using the Box Conditioner Method with 5% and 10% DMSO did not differ (P>0.05) but use of the concentration of 5% DMSO resulted in greater values than the other treatments (P<0.05) as well as for sperm motility and latency time (P<0.05), although sperm viability was superior using the Dry Shipper Method with 20% of the cryoprotectant. Mitochondrial functionality was impaired by use of the Vitrification Method with all DMSO concentration tested showing the most desirable values when the Box Conditioner Method was used with 5%, 10%, 15% DMSO and the Dry Shipper Method was used with 10% and 15% DMSO. Considering the variables evaluated, the use of the Box Conditioner Method is associated with enhanced Tambaqui semen quality with freeze concentrations of 5% and 10% DMSO. PMID:25906678

  19. Tambaqui (Colossoma macropomum sous vide: characterization and quality parameters

    Directory of Open Access Journals (Sweden)

    Fabiane de Cássia Pontes Ramos

    2016-02-01

    Full Text Available The objective of this study was to evaluate the microbiological, physical and physico-chemical quality parameters of sous vide preparation of pen-reared tambaqui (Colossoma macropomum. To prepare the tambaqui sous vide, 200 g of fillet, 50 g of basil sauce (1:4 fish fillet:sauce ratio and 10 mL of 5% sodium lactate were used. The product was then vacuum-packaged, pasteurized at 65 ºC for 12.5 min and refrigerated. The presence of Salmonella spp., sulfite-reducing Clostridium and Listeria monocytogenes was not detected in the samples analyzed. The coliform count at 45 ºC and coagulase-positive staphylococci were below the limit (103 permitted by the law in vigor. Water retention capacity and chloride content analyses revealed that the tambaqui fillet differed significantly (P<0.05 from the sous vide because of the addition of basil sauce. The total volatile basic nitrogen (TVB-N and thiobarbituric acid reactive substances (TBARS content of the fillet and sous vide were below the limits established by the law, indicating good quality. The lightness (L* and yellow color (b* of the fillet and the sous vide did not differ significantly (P>0.05, but the red color (a* decreased in the sous vide, which is related to the addition of basil sauce. The chroma (C* and hue angle (ho differed significantly (P<0.05, and the fillet samples were lighter in color, whereas the sous vide was characterized by yellow color. The n-6/n-3 ratios found for the fillet and the sous vide are within the recommended values, which is important for human metabolism. The fillet and sous vide also had high calcium, zinc, magnesium and potassium concentrations. It is concluded that tambaqui sous vide is a good source of nutrients, rich in fatty acids and minerals essential for human health.

  20. 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.

  1. Fernando Vallejo,  Almas en pena chapolas negras

    Directory of Open Access Journals (Sweden)

    Daniel García

    2012-05-01

    Full Text Available En uno de sus aforismos Ciorán se pregunta por qué no ha sido un motivo de suicidio para nadie el solo hecho de pensar que otro escribiría su biografía. Fernando Vallejo, por su parte, reconoce la miseria de este género espurio y no puede imaginarse un oficio peor que el de los biógrafos, « metidos en archivos y bibliotecas entre papeles polvosos, viejos, viviendo las infamias del pasado », más muertos que los muertos. La anécdota que abre Almas en pena chapolas negras, la biografía de José A...

  2. Effects of temperature on leucocytes of Colossoma macropomum and Hoplosternum littorale (Pisces).

    Science.gov (United States)

    Moura, M A; Farias, I P; Val, A L

    1994-07-01

    1. The effects of different thermal regimens on qualitative and quantitative characteristics of leucocytes were evaluated in two fish species of the Amazon region. 2. The proportion of circulating types of leucocytes changed significantly in Colossoma macropomum (tambaqui) but not in Hoplosternum littorale (tamoatá) exposed for four-week terms to 20, 25, 30, 35, and 40 degrees C. 3. The proportion of circulating lymphocytes decreased significantly in tambaquis exposed to 30, 35, and 40 degrees C. No changes in lymphocyte proportions were observed in tamoatás. 4. Neutrophils were almost absent in tambaquis, except in animals exposed to 40 degrees C. No significant changes in circulating neutrophils were observed in tamoatás. 5. The circulating leucocytes of Colossoma macropomum and Hoplosternum littorale are affected in different ways by temperature changes, suggesting species-specific adjustments to this parameter. PMID:7874025

  3. Alterações post-mortem em tambaqui (Colossoma macropomum) conservados em gelo Post-mortem alterations in tambaqui (Colossoma macropomum) stored in ice

    OpenAIRE

    Neiva Maria de Almeida; Gilvan Machado Batista; Makie Kodaira; Edson Lessi

    2006-01-01

    Este estudo apresenta a avaliação da qualidade de tambaqui (Colossoma macropomum) conservado em gelo. Foi determinado o tempo de vida útil por meio de avaliações sensoriais e análises de pH e bases voláteis totais (N-BVT) no músculo. A avaliação sensorial mostrou que os exemplares permaneceram com qualidade especial (Classe A) durante o período de 22 dias e com boa qualidade (Classe B) até 40 dias. A prova de degustação do peixe cozido mostrou que os exemplares permaneceram com qualidade espe...

  4. Coconut husk meal in diets for tambaqui (“Colossoma macropomum”) Farelo de coco em dietas para o tambaqui ("Colossoma macropomum")

    OpenAIRE

    Igo Gomes Guimarães; Marcos Vinícius Antunes de Lemos; Edma Carvalho de Miranda

    2011-01-01

    This study aimed to evaluate growth performance and economic viability of tambaqui fed different levels of coconut husk meal (0;25;50 and 100). Thus, a 60-day feeding trial was performed to evaluate the effect of dietary graded levels of coconut husk meal on growth performance of tambaqui (Colossoma macropomum) and economic viability. One hundred and twenty tambaqui fingerlings with 7.71±0.17g were randomly assigned to 24 150L-aquaria in a completely randomized experimental design with four t...

  5. Biologie de Colossoma macropomum (Teleostei : Serrasalmidae) dans le bassin du Mamoré (Amazonie bolivienne)

    OpenAIRE

    Loubens, Gérard; Panfili, Jacques

    1997-01-01

    The biology of #Colossoma macropomum$ is studied in the Trinidad region (Mamore Basin, Bolivia) and the results are compared with those from other basins. Almost unexploited in Bolivia, #C. macropomum$ stocks are already in regression in central Amazonia. It inhabits flood-plain and is indifferent to the two main water types, white waters originally from the Andes and black waters formed in "pampas". It is oustandingly resistant to hypoxia through the development of lower lip extensions often...

  6. Loss of genetic variability at the transferrin locus in five hatchery stocks of tambaqui (Colossoma macropomum)

    OpenAIRE

    Calcagnotto Daniela; Toledo-Filho Silvio de Almeida

    2000-01-01

    Knowledge and conservation of the genetic variability in stocks maintained as live gene banks have become a high priority task for Brazilian fish culture. The aim of the present survey was to assess the transferrin allelic diversity of five hatchery stocks of tambaqui (Colossoma macropomum). The tambaqui stock from Pentecoste, the oldest maintained in Brazilian hatchery stations, retained three of the six alleles detected in wild populations of tambaqui from the Amazon River. Other hatchery s...

  7. Omega-6/Omega-3 and PUFA/SFA in Colossoma macropomum Grown in Roraima, Brazil

    OpenAIRE

    Antonio Alves de Melho Filho; Hamilton Hermes de Oliveira; Ricardo Carvalho Santos

    2013-01-01

    In this study was evaluated the fatty acids composition of tambaqui (Colossoma macropomum) fillet, fish species cultivated in Roraima State, Brazil. For the extraction of tambaqui oil was used Sohxlet device and then it was methylated. The oil  was identified using a gas chromatograph and were identified 24 acids and these were divided into characteristic groups such as: saturated fatty acids (SFA), monounsaturated fatty acids (MUFA), polyunsaturated fatty acids (PUFA) and series fatty acids ...

  8. Innovative molecular approach to the identification of Colossoma macropomum and its hybrids

    OpenAIRE

    Fátima Gomes; Horacio Schneider; Claudene Barros; Dioniso Sampaio; Diogo Hashimoto; Fábio Porto-Foresti; Iracilda Sampaio

    2012-01-01

    Tambaqui (Colossoma macropomum) is the fish species most commonly raised in the Brazilian fish farms. The species is highly adaptable to captive conditions, and is both fast-growing and relatively fecund. In recent years, artificial breeding has produced hybrids with Characiform species, known as "Tambacu" and "Tambatinga". Identifying hybrids is a difficult process, given their morphological similarities with the parent species. This study presents an innovative molecular approach to the ide...

  9. Uji Toksisitas Akut Limbah Cair Industri Tahu Terhadap Ikan Bawal Air Tawar (Colossoma macropomum)

    OpenAIRE

    Sinurat, Mars Sella

    2016-01-01

    Changes of chemical and physic parameters of water will disrupt the organism life in it, one of the types of organisms is freshwater pomfret (Colossoma macropomum). Toxicity tests are used to determine the status of tofu industrial wastewater for the mortality rate of freshwater pomfret. Therefore, the required value of Lethal Concentration (LC50) 96 hours which is the concentration that causes 50% of test animals died within 96 hours of exposure time. This study aims to determine the LC50 va...

  10. Acute exposure to fenthion in juveniles of white cachama (Piaractus brachypomus: toxic effects, changes in cholinesterase activity and potential use in environmental monitoring

    Directory of Open Access Journals (Sweden)

    Borbón Javier F.

    2012-03-01

    Full Text Available Fenthion is an organophosphate insecticide used worldwide that may pollute waters after itsapplication causing potential problems in public health and poisoning in domestic and wildlifeanimals. Objective: to evaluate toxic effects, butyrylcholinesterase activity (BChE and use inenvironmental monitoring, 34 juveniles of white cachama (Piaractus brachypomus were distributedin 3 groups (control, 0,13 ppm and 2 ppm fenthion for 96 h. Materials and methods: fishwere exposed in 10-gallon tanks; symptoms, gross lesions post-mortem, viscerosomatic index(VSI and plasma BChE activity were evaluated. Mean comparisons for each variable amongtreatments were performed (ANOVA, α=0,05. Results: severe signs were seen in 3 specimens(3/11 of 2 ppm fenthion between 11 and 34 h of exposure. These signs were frantic swimming,muscle tremors and loss of swimming axis. In 0,13 ppm, mild to moderate signs (tremors andcaudal fin flapping were observed in some of the fish. The VSI (control = 5,3 ± 0,5; 0,13 ppm= 6,9 ± 0,3 and 2 ppm = 7,3 ± 0,6 was significantly different between exposed to fenthion andcontrols. BChE activity (control = 185,0 ± 20,4; 0,13 ppm = 12,5 ± 2,3 and 2 ppm = 9,8 ± 1,8nmoles / ml plasma / min showed significant inhibition in exposed to fenthion as compared tocontrols. Conclusions: the present work confirmed the toxic effects of fenthion in white cachamajuveniles. Results found in BChE activity suggest its use in environmental monitoring as a goodbiomarker of organophosphates waterborne exposure.

  11. Crianças negras entre a assimilação e a negritude

    Directory of Open Access Journals (Sweden)

    Petronilha Beatriz Gonçalves e Silva

    2015-08-01

    Full Text Available The article addresses the dilemma black children deal with as they construct and expose their blackness. It highlights the circumstances and challenges faced by their family members, and the contributions of the Black Movement. It ponders over the importance of teachers and schools as allies of the black community, in order to strengthen black children towards school success and to have their blackness respected. O artigo aborda dilema enfrentado por crianças negras para construírem e exporem sua negritude, aponta circunstâncias e desafios a que fazem face seus familiares, bem como contribuições do Movimento Negro. Faz ponderações a respeito da importância de professores e escolas se aliarem à comunidade negra, a fim de fortalecer as crianças negras para o sucesso escolar, tendo respeitada sua negritude.

  12. Heparina e K3EDTA como anticoagulantes para tambaqui (Colossoma macropomum Cuvier, 1816) Heparin and K3EDTA as anticoagulants for tambaqui (Colossoma macropomum Cuvier, 1816)

    OpenAIRE

    Santiago Benites de Pádua; Fabiana Pilarski; Róberson Sakabe; José Dias-Neto; Edsandra Campos Chagas; Márcia Mayumi Ishikawa

    2012-01-01

    Este estudo avaliou a eficácia da heparina sódica e do EDTA tripotássico como anticoagulantes e seus efeitos sobre os parâmetros hematológicos de tambaqui (Colossoma macropomum). Foram utilizados dez indivíduos de tambaqui com médias de 384,9 ± 85,71 g de peso e 27,90 ± 2,10 cm de comprimento total para avaliação da heparina 5.000 UI e 100 UI, bem como do K3EDTA 10%. Foram analisados a inibição da coagulação por 10 h, eritrograma e teste de fragilidade osmótica dos eritrócitos. Os resultados ...

  13. Pesticide genotoxic effect of fipronil in alevins "Gamitana" Colossoma macropomum under laboratory conditions

    OpenAIRE

    Alberto López; María Siles-Vallejos; Emily Toscano; Brighitte Melchor; Guillermo Alvarez; Vidalina Heredia; Violeta Norberto

    2011-01-01

    This study evaluates the genotoxic injury in the species Colossoma macropomum (“Gamitana") when exposed to the pesticide Fipronil, for which we used the micronucleus test (MN). We workwed with juveniles in the third stage, placed in glass tanks, which were exposed to 3 different concentrations of fipronil (C1: 0.075 mg /L, C2: 0.15 mg /L and C3: 0.30 mg /L), evaluated at 24 and 48 h. Peripheral blood was used which made the spread. The counting of micronuclei and abnormalities was...

  14. Feeds and feeding strategies for Colossoma macropomum (Cuvier 1818) fish growth as related to dietary protein.

    OpenAIRE

    Meer, van der, D

    1997-01-01

    Colossoma macropomum is an indigenous fish species from the Amazon region. The amino acid profile of its body protein proved to be similar to that of other fish species. Soya meal and fish meal have, based on their amino acid profiles, a comparable protein quality. This hypothesis was confirmed in a feeding trial. As soya meal is less palatable than fish meal, more soya in the diet tends to decrease feed uptake and growth rate, but increases protein utilization efficiency. Growth of C. macrop...

  15. Estrutura morfológica do fígado de tambaqui Colossoma macropomum (Cuvier, 1818)

    OpenAIRE

    Gerlane de Medeiros Costa; Ricardo Claro Ortis; Mendelson Guerreiro de Lima; Juliana Barbosa Casals; Ana Rita De Lima; José Roberto Kfoury Jr

    2012-01-01

    Este trabalho teve como objetivo descrever macro e microscopicamente o fígado do Tambaqui Colossoma macropomum, Teleósteo de água doce da Família Characidae, de grande interesse econômico da bacia Amazônica. Foram utilizados seis (6) exemplares jovens com idade entre seis meses e um ano, oriundos da Chácara Esteio, Alta Floresta, MT, que desenvolve principalmente a prática da piscicultura. O órgão foi fotodocumentado in situ e descrito macroscopicamente, em seguida procedeu-se a retirada de f...

  16. Morphometrical development of tambaqui (Colossoma macropomum, Cuvier, 1818) under different photoperiods

    OpenAIRE

    Pedro Pierro Mendonça; Manuel Vazquez Vidal Junior; Marcelo Fanttini Polese; Monique Virães Barbosa dos Santos; Fabrício Pereira Rezende; Dalcio Ricardo de Andrade

    2012-01-01

    The experiment was performed with 160 tambaqui (Colossoma macropomum) with average weight 11.01±2.08 g and total length 7.8±0.18 cm. Fishes were kept in sixteen aquariums with 56 L of water at 29.1±0.4 ºC of temperature, initial stocking density 1.97 g/L and constant aeration. The objective of this study was to assess the influence of photoperiod on fish performance. Treatments consisted of four photoperiods: T1 = 6 hours; T2 = 12 hours; T3 = 18 hours and T4 = 24 hours, with four replicates e...

  17. Crecimiento de Colossoma macropomum en estanques de tierra en dependencia de la densidad.

    OpenAIRE

    Jorge Günther; Jorge Boza; Nazira Gálvez

    2016-01-01

    Se analiza el crecimiento y la utilización de alimento del tambaquí, Colossoma macropomum, cultivado a densidades de 0,5, 1 y 2 peces/m2 en estanques de tierra de 60m2 con alimento balanceado con 35% proteína. No se encontraron diferencias estadísticas significativas con respecto a la densidad. Sin embargo, el crecimiento obtenido fue mucho menor que en otro ensayo realizado en las mismas condiciones y simultáneamente en un estanque de 3000 m2, por lo que se discute la hipótesis de que el cre...

  18. A preliminary market research about tambaqui (Colossoma macropomum) in Costa Rica (ESP)

    OpenAIRE

    Raymon van Anrooy; Jorge Günther; Jorge Boza; Nazira Gálvez

    2016-01-01

    From January to July 1995, a market trial was conducted in Costa Rica with the fresh water fish species. Colossoma macropomum, commonly named “tambaqui”. About 1200 fish with an average weight of 800g were obtained from the fish culture station of the Universidad Nacional near La Rita, Guápiles. About 20 fish were delivered each Monday initially to three and later to each of four fishdealers in Limón, Guápiles, San José and Heredia. The shopkeepers purchased the fish at a price of $1.40/kg, c...

  19. Seasonal variation of nutrients and energy in tambaqui's (Colossoma Macropomum Cuvier, 1818) natural food

    OpenAIRE

    SILVA J. A. M. da; PEREIRA-FILHO M.; M. I. de OLIVEIRA-PEREIRA

    2000-01-01

    The aim of this study was to evaluate the importance of fruits and seeds as food items in the natural diet of the tambaqui (Colossoma macropomum). During one year, tambaqui's stomach contents were collected, and their nutritional and energetic values were determined. During the flooding period, and while the river water was rising, which coincided with a high availability of fruits and seeds, the protein content of food was low (11%-15% of dry matter basis), whereas in the dry season, when ta...

  20. Alterações post-mortem em tambaqui (Colossoma macropomum) conservados em gelo

    OpenAIRE

    Almeida Neiva Maria de; Batista Gilvan Machado; Kodaira Makie; Lessi Edson

    2006-01-01

    Este estudo apresenta a avaliação da qualidade de tambaqui (Colossoma macropomum) conservado em gelo. Foi determinado o tempo de vida útil por meio de avaliações sensoriais e análises de pH e bases voláteis totais (N-BVT) no músculo. A avaliação sensorial mostrou que os exemplares permaneceram com qualidade especial (Classe A) durante o período de 22 dias e com boa qualidade (Classe B) até 40 dias. A prova de degustação do peixe cozido mostrou que os exemplares permaneceram com qualidade espe...

  1. Histopathological changes in the head kidney induced by cadmium in a neotropical fish Colossoma macropomum

    OpenAIRE

    R. Salazar-Lugo; Vargas, A.(Benemérita Universidad Autónoma de Puebla, Puebla, Mexico); Rojas, L.; Lemus, M.

    2013-01-01

    We evaluated the effect of cadmium (Cd) on the structure and function of the head kidney in the freshwater fish Colossoma macropomum (C. macropomum). Juveniles were exposed to 0.1 mg/L CdCl2 for 31 days. Blood samples were examined using hematological tests and head kidney histology was determined by light microscopy. The concentration of Cd in the head and trunk kidneys was measured using an atomic absorption spectrophotometer. Cd produced histopathological changes in the head kidney, the mo...

  2. IMPACTS OF ECOTOURISM ON THE BOG OF SERRA NEGRA - BEZERROS/ PE

    Directory of Open Access Journals (Sweden)

    Carolina Florio Castro

    2005-05-01

    Full Text Available The “Brejo da Serra Negra” ( Bog of Serra Negra has become an area of interest of manysectors of society, among them tourism in its different forms. Ecotourism is one of thepropellers of tourism and defined by the Institute of Ecotourism of Brazil as : “the practice ofrecreational, sporting or educational tourism using, in a sustainable form, natural and culturalassets, encouraging conservation, promoting environmental awareness and assuring the wellbeing of the populations involved” (Instituto de Ecoturismo do Brasil, 1995. Within thisperspective some questions such as : how does ecotourism is developed in the concernedarea? What are the impacts caused on Brejo da Serra Negra ( Bog of Serra Negra? How isenvironmental awareness being addressed? should be answered.The Brejo da Serra Negra has been the constant aim of ecotourism because of its very uniquebeauty and the fact that it is a climatic sub-humid area in the hinterlands of Pernambuco andattraction to the so-called radical sports, ecologic tours, caverns exploring as well as camping.

  3. Efecto de extracto de algas marinas sobre parámetros productivos de la cachama blanca (Piaractus brachypomus: ensayos en laboratorio y a escala comercial

    Directory of Open Access Journals (Sweden)

    Gloria Gutiérrez-Yara

    2009-06-01

    Full Text Available Con el fin de evaluar los posibles efectos de la administración de un extracto de algas marinas (EAM, sobre parámetros productivos de la cachama blanca (Piaractus brachypomus, 8994 dedinos de 7 ± 3 g de peso corporal y 6.8 ± 0.7 cm de longitud total, fueron utilizados para realizar ensayos a nivel de laboratorio y a escala comercial. Tanto a nivel de laboratorio (42 d como a escala comercial (150 días, utilizando un diseño completamente al azar, se evaluaron 4 tratamientos: TTO1 (control, TTO2 (EAM vía oral por 42 o 30 días, TTO3 (EAM inyectado 0.2 mL/pez, vía IP y TTO4 (EAM inyectado 0.2 mL/pez vía IP, más EAM vía oral por 42 o 30 días. La presentaciónoral del extracto fue suministrada mezclada con el alimento (30% PB en una proporción de 1 %, durante 42 o 30 días, a nivel de laboratorio o a escala comercial, respectivamente. A escala comercial, el peso corporal y la longitud total se evaluaron cada 15 días, muestreando c.a 10% de la población de cada réplica. Al final de los dos experimentos se evaluó la ganancia de peso corporal (GPC, tasa de crecimiento específica en peso (TCEP y en longitud (TCEL, factor de condición relativo (Kn, conversión alimenticia (CA y porcentaje de sobrevivencia (%S. En general, los resultados no revelaron diferencias significativas entre los tratamientos; sin embargo, a escala comercial, algunas variables productivas en los tratamientos que recibieron EAM vía oral, mostraron una tendenciaa ser superiores que los individuos control, especialmente durante el periodo que duró la administración del extracto. Adicionalmente, durante los primeros 45 d de cultivo, el GPC, TCEP y TCEL fueron mejores que el grupo control, sugiriendo que puede existir un posible efecto de la inmunoestimulación sobre estas variables.

  4. A produção escrita das mulheres negras The written production of black women

    Directory of Open Access Journals (Sweden)

    Maria Conceição Lopes Fontoura

    2004-12-01

    Full Text Available O artigo faz uma análise dos escritos publicados por Maria Mulher – Organização de Mulheres Negras, tendo em vista atender a sua missão institucional.Inicialmente, é feita uma apresentação da forma como a organização presta informações para as mulheres, em especial, as negras, visando ao combate às discriminações sexista, de raça/etnia e de classe social dentro dos programas que desenvolve. O texto faz também referência à falta de organizações que incentivem a produção intelectual de entidades feministas negras. Finalmente, para aumentar o número de publicações das organizações de mulheres negras, o trabalho aponta para a produção de obras em conjunto, as quais abordarão temas de acordo com a vocação de cada instituição.The paper presents an analysis of the articles published for Maria Mulher Organização de Mulheres Negras, in order of taking care of its institucional mission. Initially it is made a presentation of the form that the organization gives information for the women, in special, for the blacks, in order to combat the discriminations by sex, of race/ethnic and of social class, in the programs that develops. The text also makes reference to the lack of organizations that stimulates the intellectual production of entities black feminists. Finally, the work points to the production of workmanships in order to increase the number of publications from the black women organizations, in accordance with the vocation of each institution.

  5. 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.

  6. Myxobolus sp. (Myxozoa in the circulating blood of Colossoma macropomum (Osteichthyes, Characidae Myxobolus sp. (Myxozoa no sangue circulante de Colossoma macropomum (Osteichthyes, Characidae

    Directory of Open Access Journals (Sweden)

    Patricia Oliveira Maciel

    2011-03-01

    Full Text Available Myxosporea parasitize many organs in fresh and saltwater fish. Species of the genus Myxobolus parasitizing the gills and other organs of the tambaqui Colossoma macropomum have been described. In the present study, blood smears were made from juvenile tambaqui and were stained with May Grunwald-Giemsa-Wright in order to identify myxozoan parasites. Out of a total of 36 fish examined, one specimen (2.7% that was reared in a cage presented spores that were identified as M. colossomatis, whereas fish kept in 250 L tanks showed prevalence of 5.5%. This is the first report of M. colossomatis in the blood of farmed tambaqui in the Amazon region. These results indicate that myxozoan parasites should also be investigated in fish blood smears. Some myxosporean species may cause diseases in fish, and these species need to be identified so that adequate preventive sanitary control can be instituted.Mixosporídeos parasitam diversos órgãos de peixes de água doce e salgada, tendo sido descrita espécie do gênero Myxobolus parasitando brânquias e outros órgãos de tambaqui Colossoma macropomum. No presente trabalho, extensões sanguíneas de juvenis de tambaquis foram confeccionadas e coradas com May Grunwald-Giemsa-Wright para identificação de parasitos myxozoários. Do total de 36 peixes examinados, um espécime (2,7% cultivado em tanque-rede apresentou esporos identificados como M. colossomatis, enquanto os peixes mantidos em tanques com 250 L apresentaram prevalência de 5,5%. Esse é o primeiro registro de M. colossomatis no sangue de tambaqui cultivado na Amazônia. Esses resultados indicam que parasitos Myxozoa devem ser também investigados em extensões sanguíneas. Algumas espécies de mixosporídeos podem causar doença em peixes, sendo necessária a identificação da espécie para um adequado manejo sanitário preventivo.

  7. Heparina e K3EDTA como anticoagulantes para tambaqui (Colossoma macropomum Cuvier, 1816 Heparin and K3EDTA as anticoagulants for tambaqui (Colossoma macropomum Cuvier, 1816

    Directory of Open Access Journals (Sweden)

    Santiago Benites de Pádua

    2012-06-01

    Full Text Available Este estudo avaliou a eficácia da heparina sódica e do EDTA tripotássico como anticoagulantes e seus efeitos sobre os parâmetros hematológicos de tambaqui (Colossoma macropomum. Foram utilizados dez indivíduos de tambaqui com médias de 384,9 ± 85,71 g de peso e 27,90 ± 2,10 cm de comprimento total para avaliação da heparina 5.000 UI e 100 UI, bem como do K3EDTA 10%. Foram analisados a inibição da coagulação por 10 h, eritrograma e teste de fragilidade osmótica dos eritrócitos. Os resultados foram submetidos à análise de variância e as médias comparadas pelo teste de Tukey (P 0,05 na contagem de eritrócitos, hematócrito, taxa de hemoglobina e CHCM, no entanto, houve aumento do VCM (P The efficacy of sodium heparin and tripotassium EDTA as anticoagulant and their effect on the hematological parameters of tambaqui (Colossoma macropomum were evaluated in this study. Ten fish weighing 384.9 ± 85.71 g and measuring 27.90 ± 2.10 cm were used for heparin 5.000 IU, heparin 100 IU and K3EDTA 10% evaluation. Clotting inhibition after 10 h, erythrogram and osmotic fragility of erythrocytes were observed. The results were submitted to variance analysis and means compared by Tukey test (P 0.05 in erythrocyte count, hematocrit, hemoglobin and MCHC. On the other hand, an increase in MCV (P < 0.05 in samples kept with K3EDTA10% was observed. This anticoagulant provoked a significant increase (P < 0.01 in the osmotic fragility of erythrocytes when compared to pure heparin, diluted heparin and the control group. Heparin as an anticoagulant is more appropriate for tambaqui since it was effective in preventing coagulation for more than 10 h, without causing hemolysis, changes on hematological parameters or osmotic fragility of erythrocytes.

  8. Características hematológicas do tambaqui Colossoma macropomum Cuvier (Osteichthyes, Characidae em sistema de monocultivo intensivo: II. Leucócitos Hematological characteristics of tambaqui Colossoma macropomum Cuvier (Osteichthyes, Characidae under intensive system: II. Leukocytes

    Directory of Open Access Journals (Sweden)

    Marcos Tavares-Dias

    1999-03-01

    Full Text Available The leukocytes parameters in approximately one-year-old freshwater fish Colossoma macropomum Cuvier, 1818 (tambaqui kept in an intensive monobreeding system as well as the correlation among these parameters and the biometric data (total weight and standard length were investigated. The mean value of the white blood cell count (WBC in the peripheral blood of tambaqui was 2663.3±1288µl and in the differential count, the following means were observed: neutrophils (1566.2±754µl; lymphocytes (973.6±447µl; monocytes (86.7±123µl and special granulocitic cells (7.8±144µl. The blood parameters studied were positively correlated among one another, but were negatively correlated with the standard length. However, no correlation was with the weigth of the animals was shown. The leukocytes in Colossoma macropomum kept in an intensive monobreeding system were morphologically similar to those of other Brazilian teleosts described in literature.

  9. Uranium prospecting in alkaline mountain chimneys of Serra Negra and Salitre - Minas Gerais, Brasil

    International Nuclear Information System (INIS)

    The occurence of radioactive minerals such as apatite and pyrochlore, in the alkaline chimneys of Serra Negra and Salitre (Minas Gerais, Brazil), is discussed. Also mentioned are other minerals of interest associated with the alkaline magma such as columbite, fluorite, monazite, zircon, baddeleyite, etc, which in favourable conditions may occur in deposits of great economical value, and which may present high contents of rare earths, thorium and uranium

  10. Características hematológicas do tambaqui Colossoma macropomum Cuvier (Osteichthyes, Characidae) em sistema de monocultivo intensivo: II. Leucócitos Hematological characteristics of tambaqui Colossoma macropomum Cuvier (Osteichthyes, Characidae) under intensive system: II. Leukocytes

    OpenAIRE

    Marcos Tavares-Dias; Elziane F. Silva Sandrim; Eugênio de Campos-Filho

    1999-01-01

    The leukocytes parameters in approximately one-year-old freshwater fish Colossoma macropomum Cuvier, 1818 (tambaqui) kept in an intensive monobreeding system as well as the correlation among these parameters and the biometric data (total weight and standard length) were investigated. The mean value of the white blood cell count (WBC) in the peripheral blood of tambaqui was 2663.3±1288µl and in the differential count, the following means were observed: neutrophils (1566.2±754µl); lymphocytes (...

  11. Genetic variability of wild and captivity populations of Colossoma macropomum (Cuvier, 1818)=Variabilidade genética de populações selvagens e de cativeiro de Colossoma macropomum (Cuvier, 1818)

    OpenAIRE

    Vera Maria Fonseca Almeida-Val; Maria de Nazaré Paula-Silva; Givanildo Ximenes Santana; Marco Aurélio de Brito Leitão; Carolina Fernandes Silva de Sousa; Carlos Henrique dos Anjos dos Santos

    2012-01-01

    Tambaqui (Colossoma macropomum) is among the most important fish species of the Amazon and one of the most cultivated in Brazil. In the present work we have evaluated the genetic variability of wild and captivity populations of C. macropomum. Enzymatic markers were used to estimate the genetic variability of 41 specimens from a wild group; and 30, 33 and 45 from three captivity groups, which came from Pentecostes (Ceará State), Jaboticabal (São Paulo State) and Itacoatiara (Amazonas State), r...

  12. The feeding activity of Colossoma macropomum larvae (tambaqui) in fishponds with water hyacinth (Eichhornia crassipes) fertilizer Atividade alimentar de larvas de Colossoma macropomum (tambaqui) em viveiro fertilizado com aguapé (Eichhornia crassipes)

    OpenAIRE

    LH. Sipaúba-Tavares; FMS. Braga

    2007-01-01

    Analysis of macrophyte water hyacinth (Eichhornia crassipes) as an organic fertilizer of Colossoma macropomum (tambaqui) larvae in ponds is provided. Water hyacinth produce an organic fertilizer at the ratio of 100 g.m-2 in tambaqui ponds. Two groups of 5,000 larvae were transferred to two fishponds with and without water hyacinth fertilizer and reared until day 43. The fertilized pond evidenced more plankton abundance during the entire production period when compared with the control pond (P...

  13. Structural indexes and sexual maturity of tambaqui Colossoma macropomum (cuvier, 1818) (Characiformes: Characidae) in Central Amazon, Brazil Índices estruturais e maturidade sexual do tambaqui Colossoma macropomum (cuvier, 1818) (Characiformes: Characidae) no Amazonas Central, Brasil

    OpenAIRE

    M. A. VILLACORTA-CORREA; Saint-Paul, U.

    1999-01-01

    Length, weight, structural index and sexual maturity in tambaqui Colossoma macropomum were analysed. 449 specimens were obtained from the commercial fishing fleet arriving at Manaus Harbour from the floodplain areas from May 1992 to July 1993. The objective of this study is to describe changes in structural index during one hidrological cycle and to interpret them according to the water level fluctuations and to also determine the time, reproductive period and length in sexual maturity. Sex r...

  14. Nombre, muerte y santificación de una prostituta. Escritura y culto de Botitas Negras

    Directory of Open Access Journals (Sweden)

    Jorge Pávez Ojeda

    2010-09-01

    Full Text Available En este artículo analizamos las diferentes formas de reinscripción del cuerpo y figura de una Irene Iturra Sáez, prostituta asesinada en la ciudad de Calama, en el norte de Chile, en septiembre de 1969, y conocida hoy con el nombre de Botitas Negras. Las escrituras que prolifera en torno a esta “santita” popular otorgan importantes claves para entender la singularidad del personaje y las formas de devoción popular que lo “canonizan”. Presentamos así las diferentes formas y contenidos de esta intertextualidad que se despliega en torno a la vida, la muerte y la vida postmortem de Botitas Negras: prensa, escrituras judiciales, rumores, cartas, objetos, y nombres propios. Las cartas dirigidas a la santa prostituta y los objetos de su altar trazan las inscripciones de su existencia actual, a través de lo que identificamos como un ciclo de intercambio dialógico entre los devotos y la santa. De esta manera, podremos ver el santuario de Botitas Negras como una “oficina de gobierno” que recibe peticiones (cartas y obsequios (pagos, y la santa milagrosa como ministra de una teocracia biopolítica que dispensa “protección de la vida” e interviene con milagros, en ayuda de sujetos fragmentados y precarizados por el gobierno neoliberal de una “mano invisible”.

  15. Crecimiento de Colossoma macropomum en estanques de tierra en dependencia de la densidad.

    Directory of Open Access Journals (Sweden)

    Jorge Günther

    2016-03-01

    Full Text Available Se analiza el crecimiento y la utilización de alimento del tambaquí, Colossoma macropomum, cultivado a densidades de 0,5, 1 y 2 peces/m2 en estanques de tierra de 60m2 con alimento balanceado con 35% proteína. No se encontraron diferencias estadísticas significativas con respecto a la densidad. Sin embargo, el crecimiento obtenido fue mucho menor que en otro ensayo realizado en las mismas condiciones y simultáneamente en un estanque de 3000 m2, por lo que se discute la hipótesis de que el crecimiento del tambaquí esté relacionado con el tamaño del estanque.

  16. Performance of Tambaqui (Colossoma macropomum) in Cages, under Different Percentage of Feeding

    OpenAIRE

    A. A. B. Pereira; P. R. Moeller; N. T. Vanderline; L. C. Q. Moura; P.S.A. Moreira

    2014-01-01

    The aim of this study was to evaluate the performance of different rate in percentage feeding of the productivity (Body weight (BW) and feed conversion (FC)) of juvenile tambaqui (Colossoma macropomum), with a total of 13500 animals, distributed in nine cages, with n = 1500 fish/cage, with three replicates in a period of four weeks. The animals were feed with   three treatments: treatment 1 (2% BW); treatment 2 ( 3% BW) and treatment 3 (4% BW), divided in two meals,  and feed  with commercial...

  17. Growth of the tambaqui Colossoma macropomum (Cuvier) (Characiformes: Characidae): which is the best model?

    Science.gov (United States)

    Penna, M A H; Villacorta-Corrêa, M A; Walter, T; Petrere-Jr, M

    2005-02-01

    In order to decide which is the best growth model for the tambaqui Colossoma macropomum Cuvier, 1818, we utilized 249 and 256 length-at-age ring readings in otholiths and scales respectively, for the same sample of individuals. The Schnute model was utilized and it is concluded that the Von Bertalanffy model is the most adequate for these data, because it proved highly stable for the data set, and only slightly sensitive to the initial values of the estimated parameters. The phi values estimated from five different data sources presented a CV = 4.78%. The numerical discrepancies between these values are of not much concern due to the high negative correlation between k and Linfinity viz, so that when one of them increases, the other decreases and the final result in phi remains nearly unchanged. PMID:16025912

  18. Use of amides as cryoprotectants in extenders for frozen sperm of tambaqui, Colossoma macropomum.

    Science.gov (United States)

    Varela Junior, A S; Corcini, C D; Gheller, S M M; Jardim, R D; Lucia, T; Streit, D P; Figueiredo, M R C

    2012-07-15

    Amides were tested as cryoprotectants in comparison with glycerol and DMSO (more traditional cryoprotectants) for recovery of Colossoma macropomum (tambaqui fish) sperm. Milt was extended in Beltsville Thawing Solution, then frozen with the addition of 2%, 5%, 8%, or 11% of: (1) dimethylacetamide (DMA), (2) dimethylformamide (DMF), (3) methylformamide (MF), or with 5% glycerol or 10% dimethylsulfoxide. Fertilization rates were greatest (P0.05). For such treatments, both fertilization and hatching rates were similar (P>0.05) to those with fresh sperm (91.7±1.4 and 87.4±1.4, respectively). The best sperm motility across extenders (at least 55.7%) was with 5%, 8%, and 11% DMF (Pmacropomum sperm. PMID:22578629

  19. Myxobolus sp. (Myxozoa) in the circulating blood of Colossoma macropomum (Osteichthyes, Characidae).

    Science.gov (United States)

    Maciel, Patricia Oliveira; Affonso, Elizabeth Gusmão; Boijink, Cheila de Lima; Tavares-Dias, Marcos; Inoue, Luis Antonio Kioshi Aoki

    2011-01-01

    Myxosporea parasitize many organs in fresh and saltwater fish. Species of the genus Myxobolus parasitizing the gills and other organs of the tambaqui Colossoma macropomum have been described. In the present study, blood smears were made from juvenile tambaqui and were stained with May Grunwald-Giemsa-Wright in order to identify myxozoan parasites. Out of a total of 36 fish examined, one specimen (2.7%) that was reared in a cage presented spores that were identified as M. colossomatis, whereas fish kept in 250 L tanks showed prevalence of 5.5%. This is the first report of M. colossomatis in the blood of farmed tambaqui in the Amazon region. These results indicate that myxozoan parasites should also be investigated in fish blood smears. Some myxosporean species may cause diseases in fish, and these species need to be identified so that adequate preventive sanitary control can be instituted. PMID:21439240

  20. Histopathological changes in the head kidney induced by cadmium in a neotropical fish Colossoma macropomum.

    Science.gov (United States)

    Salazar-Lugo, R; Vargas, A; Rojas, L; Lemus, M

    2013-01-01

    We evaluated the effect of cadmium (Cd) on the structure and function of the head kidney in the freshwater fish Colossoma macropomum (C. macropomum). Juveniles were exposed to 0.1 mg/L CdCl2 for 31 days. Blood samples were examined using hematological tests and head kidney histology was determined by light microscopy. The concentration of Cd in the head and trunk kidneys was measured using an atomic absorption spectrophotometer. Cd produced histopathological changes in the head kidney, the most evident of these being: the thickening of the vein wall, an increase in the number of basophils/mast cells close to blood vessels and a severe depletion of hematopoietic precursors especially the granulopoietic series. In the blood, a decrease in the total leucocytes and hemoglobin concentration was observed. Cd-exposed fish showed higher Cd concentrations in the trunk kidney than the head kidney. In conclusion, exposure to Cd affected precursor hematopoietic cells in C. macropomum. PMID:26623329

  1. Loss of genetic variability at the transferrin locus in five hatchery stocks of tambaqui (Colossoma macropomum

    Directory of Open Access Journals (Sweden)

    Calcagnotto Daniela

    2000-01-01

    Full Text Available Knowledge and conservation of the genetic variability in stocks maintained as live gene banks have become a high priority task for Brazilian fish culture. The aim of the present survey was to assess the transferrin allelic diversity of five hatchery stocks of tambaqui (Colossoma macropomum. The tambaqui stock from Pentecoste, the oldest maintained in Brazilian hatchery stations, retained three of the six alleles detected in wild populations of tambaqui from the Amazon River. Other hatchery stocks, directly or indirectly derived from the Pentecoste stock, did not show transferrin allelic variability. Insufficient number of founders and genetic drift due to sampling errors seem to be the main causes leading to loss of genetic diversity in tambaqui hatchery stocks. Appropriate management strategies are required in order to improve the genetic potential of tambaqui stocks in Brazil.

  2. Computed tomographic and cross-sectional anatomy of the normal pacu (Colossoma macroponum).

    Science.gov (United States)

    Carr, Alaina; Weber, E P Scott; Murphy, Chris J; Zwingenberger, Alison

    2014-03-01

    The purpose of this study was to compare and define the normal cross-sectional gross and computed tomographic (CT) anatomy for a species of boney fish to better gain insight into the use of advanced diagnostic imaging for future clinical cases. The pacu (Colossoma macropomum) was used because of its widespread presence in the aquarium trade, its relatively large body size, and its importance in the research and aquaculture settings. Transverse 0.6-mm CT images of three cadaver fish were obtained and compared to corresponding frozen cross sections of the fish. Relevant anatomic structures were identified and labeled at each level; the Hounsfield unit density of major organs was established. The images presented good anatomic detail and provide a reference for future research and clinical investigation. PMID:24712183

  3. Seasonal variation of nutrients and energy in tambaqui's (Colossoma Macropomum Cuvier, 1818) natural food.

    Science.gov (United States)

    Silva, J A; Pereira-Filho, M; Oliveira-Pereira, M I

    2000-11-01

    The aim of this study was to evaluate the importance of fruits and seeds as food items in the natural diet of the tambaqui (Colossoma macropomum). During one year, tambaqui's stomach contents were collected, and their nutritional and energetic values were determined. During the flooding period, and while the river water was rising, which coincided with a high availability of fruits and seeds, the protein content of food was low (11%-15% of dry matter basis), whereas in the dry season, when tambaqui fed mainly zooplankton, there was a high protein content (45%-57% of dry matter basis). Lipid, carbohydrate, crude fiber, ash and gross energy contents of the diet varied depending on the river water level and the food items ingested. PMID:11241958

  4. Seasonal variation of nutrients and energy in tambaqui's (Colossoma Macropomum Cuvier, 1818 natural food

    Directory of Open Access Journals (Sweden)

    SILVA J. A. M. da

    2000-01-01

    Full Text Available The aim of this study was to evaluate the importance of fruits and seeds as food items in the natural diet of the tambaqui (Colossoma macropomum. During one year, tambaqui's stomach contents were collected, and their nutritional and energetic values were determined. During the flooding period, and while the river water was rising, which coincided with a high availability of fruits and seeds, the protein content of food was low (11%-15% of dry matter basis, whereas in the dry season, when tambaqui fed mainly zooplankton, there was a high protein content (45%-57% of dry matter basis. Lipid, carbohydrate, crude fiber, ash and gross energy contents of the diet varied depending on the river water level and the food items ingested.

  5. Pesticide genotoxic effect of fipronil in alevins "Gamitana" Colossoma macropomum under laboratory conditions

    Directory of Open Access Journals (Sweden)

    Alberto López

    2011-12-01

    Full Text Available This study evaluates the genotoxic injury in the species Colossoma macropomum (“Gamitana" when exposed to the pesticide Fipronil, for which we used the micronucleus test (MN. We workwed with juveniles in the third stage, placed in glass tanks, which were exposed to 3 different concentrations of fipronil (C1: 0.075 mg /L, C2: 0.15 mg /L and C3: 0.30 mg /L, evaluated at 24 and 48 h. Peripheral blood was used which made the spread. The counting of micronuclei and abnormalities was made on the basis of 1000 cells. The average rate of micronuclei indicates that 0.075 mg / L the average frequency is twice the control. With regard to abnormalities of the core, was found more frequently at 48 h of exposure.

  6. Efecto del cobre y del cadmio sobre la respuesta inmune innata del pez Colossoma macropomum

    OpenAIRE

    A. Vargas; Y. Blanco; Salazar-Lugo, R.

    2012-01-01

    En este trabajo se evaluó la respuesta inmunológica celular inespecífica del pez Colossoma macropomum (Cuvier, 1818) expuesto a concentraciones subletales de cobre y cadmio, a través de la determinación de la viabilidad celular, la quimiotaxis, la fagocitosis y la muerte bacteriana en células inmunocompetentes extraídas del riñón cefálico, la sangre y el hígado. Los peces fueron expuestos por separado a 0,5 mg/L de cloruro de cobre y 1,0 mg/L de cloruro de cadmio durante 28 días; después de l...

  7. Blood parameters and metabolites in the teleost fish Colossoma macropomum exposed to sulfide or hypoxia.

    Science.gov (United States)

    Affonso, E G; Polez, V L P; Corrêa, C F; Mazon, A F; Araújo, M R R; Moraes, G; Rantin, F T

    2002-11-01

    Juvenile tambaqui, Colossoma macropomum, were exposed to sulfide and hypoxia for 12, 24, 48 and 96 h. Hemoglobin concentrations, red blood cell counts, and mean cell hemoglobin, were higher at 12 h in fish exposed to hypoxia. However, control fish and those exposed to sulfide and hypoxia had lower red blood cell count, hemoglobin concentration and hematocrit at 96 h. Methemoglobin was higher than in the controls, probably due to the hypoxemia induced by these stressors. Sulfhemoglobin was not detected in significant amounts in the blood of fish exposed to sulfide (in vivo), yet hemoglobin converted into sulfhemoglobin at 1-15 mM sulfide in vitro. Anaerobic metabolism seemed to be an important mechanism for adapting to sulfide exposure and blood pH returned to control values after 24 h of sulfide, preventing acidosis. The high sulfide tolerance in tambaqui is associated with its high tolerance to hypoxia. PMID:12379422

  8. Oxidative stress enzyme and histopathological lesions in Colossoma macropomum (pisces, ariidae) for environmental impact assessment

    Science.gov (United States)

    Andrade, Ticianne de Sousa de Oliveira Mota; Sousa, Debora Batista Pinheiro; Dantas, Janaina Gomes; Castro, Jonatas da Silva; Neta, Raimunda Nonata Fortes Carvalho

    2015-12-01

    This study used oxidative stress enzyme (Glutathione S-Transferase and Catalase), histopathological lesions (Branchial lesions) and biometric data in the freshwater fish tambaqui, Colossoma macropomum, to assess environmental impacts in an Environmental Protection Area at São Luis, Brazil. Fish were sampled from two locations (A1 = contaminated area and A2 = reference site) within the protected area on four occasions. The activity of catalase (CAT) and glutathione S-transferase (GST) in C. macropomum was compared with biometric data and histopathological lesions. Results have shown that biometric data decreased significantly in fish (pGST activity in the liver of C. macropomum when comparing fish from the contaminated site and those from the reference site (p<0.05).

  9. Omega-6/Omega-3 and PUFA/SFA in Colossoma macropomum Grown in Roraima, Brazil

    Directory of Open Access Journals (Sweden)

    Antonio Alves Melho Filho

    2013-05-01

    Full Text Available In this study was evaluated the fatty acids composition of tambaqui (Colossoma macropomum fillet, fish species cultivated in Roraima State, Brazil. For the extraction of tambaqui oil was used Sohxlet device and then it was methylated. The oil  was identified using a gas chromatograph and were identified 24 acids and these were divided into characteristic groups such as: saturated fatty acids (SFA, monounsaturated fatty acids (MUFA, polyunsaturated fatty acids (PUFA and series fatty acids omega-6 and omega-3. The ratios obtained were PUFA/SFA and omega-6/omega-3. The results of chromatographic analysis were subjected to tests by variance ANOVA and multiple comparisons of Tukey at 5%. The ratios omega-6/omega-3 and PUFA/SFA showed values ​​of 8.58 and 0.75 respectively.

  10. Efecto del cobre y del cadmio sobre la respuesta inmune innata del pez Colossoma macropomum

    Directory of Open Access Journals (Sweden)

    A. Vargas

    2012-01-01

    Full Text Available En este trabajo se evaluó la respuesta inmunológica celular inespecífica del pez Colossoma macropomum (Cuvier, 1818 expuesto a concentraciones subletales de cobre y cadmio, a través de la determinación de la viabilidad celular, la quimiotaxis, la fagocitosis y la muerte bacteriana en células inmunocompetentes extraídas del riñón cefálico, la sangre y el hígado. Los peces fueron expuestos por separado a 0,5 mg/L de cloruro de cobre y 1,0 mg/L de cloruro de cadmio durante 28 días; después de la exposición, se depuraron por el mismo período. La viabilidad celular se mantuvo entre 99-94%. La exposición al cadmio causó una reducción significativa en la respuesta quimiotáctica de granulocitos en los tejidos evaluados. Tanto los peces expuestos a cobre como los expuestos a cadmio presentaron una disminución significativa en la respuesta fagocítica de granulocitos. En sangre, el cadmio afectó la efectividad de los granulocitos de inducir muerte bacteriana; el cobre sin embargo, afectó la efectividad de inducir muerte bacteriana en los granulocitos provenientes del hígado. Los peces expuestos a cadmio presentaron un incremento significativo en los niveles de cortisol sérico y una disminución de esta hormona en los peces expuestos a cobre. Estos resultados demuestran que la exposición crónica a los metales cobre y cadmio produce una inhibición de la respuesta inmune inespecífica en el pez Colossoma macropomum.

  11. Morphometrical development of tambaqui (Colossoma macropomum, Cuvier, 1818 under different photoperiods

    Directory of Open Access Journals (Sweden)

    Pedro Pierro Mendonça

    2012-06-01

    Full Text Available The experiment was performed with 160 tambaqui (Colossoma macropomum with average weight 11.01±2.08 g and total length 7.8±0.18 cm. Fishes were kept in sixteen aquariums with 56 L of water at 29.1±0.4 ºC of temperature, initial stocking density 1.97 g/L and constant aeration. The objective of this study was to assess the influence of photoperiod on fish performance. Treatments consisted of four photoperiods: T1 = 6 hours; T2 = 12 hours; T3 = 18 hours and T4 = 24 hours, with four replicates each. Fishes were fed twice a day with commercial extruded feed (28% of crude protein. The experiment was developed in closed circulation system, with volume of water renewal for each experimental unit equivalent to 40 times daily. Fish biometry was performed at the beginning of the experiment and at every 16 days, in order to follow the effects of treatments on juvenile development. Final weight, total length, standard length, height, feed intake, weight gain, feed conversion, survival, specific growth rate, protein efficiency rate and protein retention efficiency were assessed. Statistical analysis of variables was performed with application of the software SAEG version 9.1, for analysis of variance, regression analysis and Pearson correlation. Positive influence of photoperiod was observed for the studied variables in this study. The studied variables enhanced as the photoperiod increased, mainly between 15 and 22 hours. The photoperiod has significant influence upon growth traits of tambaqui (Colossoma macropomum.

  12. Physicochemical analysis of the oil of tambaqui fillet (Colossoma macropomum) cultivated in the state of Roraima, Brazil

    OpenAIRE

    Antonio Alves de Melho Filho; Hamilton Hermes de Oliveira; Francisco dos Santos Panero; Ricardo Carvalho dos Santos

    2013-01-01

    The objective this work was to realize chemometrics analysis and to determine the physicochemical characteristics of tambaqui fish oil (Colossoma macropomum), grown in four localities in the state of Roraima, Alto Alegre (A), Bonfim (B), Uraricoera (U) and Passarão (P). Obtaining oil tambaqui was through his ground meat, dried in oven air circulation following agitation for one hour. Some physicochemical characteristics were analyzed: acidity index (AI), in oleic acid acidity (OAA), of iodine...

  13. Studies of micronuclei and other nuclear abnormalities in red blood cells of Colossoma macropomum exposed to methylmercury

    OpenAIRE

    Carlos Alberto Machado da Rocha; Lorena Araújo da Cunha; Raul Henrique da Silva Pinheiro; Marcelo de Oliveira Bahia; Rommel Mario Rodríguez Burbano

    2011-01-01

    The frequencies of micronuclei (MN) and morphological nuclear abnormalities (NA) in erythrocytes in the peripheral blood of tambaqui (Colossoma macropomum), treated with 2 mg.L−1 methylmercury (MeHg), were analyzed. Two groups (nine specimens in each) were exposed to MeHg for different periods (group A - 24 h; group B - 120 h). A third group served as negative control (group C, untreated; n = 9). Although, when compared to the control group there were no significant differences in MN frequenc...

  14. Perulernaea gamitanae (Copepoda: Lernaeidae) parasitizing tambaqui (Colossoma macropomum) (Characidae) and the hybrids tambacu and tambatinga, cultured in northern Brazil

    OpenAIRE

    M. Tavares-Dias; L.R. Neves; E.F. Santos; M.K.R. Dias; R.G.B. Marinho; E.A. Ono

    2011-01-01

    The infestation rate in Colossoma macropomum, hybrid tambacu (C. macropomum x Piaractus mesopotamicus) and hybrid tambatinga (C. macropomum x Piaractus brachypomum) with Perulernaea gamitanae Thatcher and Paredes, 1985 from two fish farms in Amapá State, Brazil was studied. Lernaeid parasites (n=2887) were collected mainly on the tongue and the mouth cavity and also on cartilage of gill arches and filaments. Inflammation and fibrous nodules were observed on the attachment sites of the parasit...

  15. Structural indexes and sexual maturity of tambaqui Colossoma macropomum (cuvier, 1818) (Characiformes: Characidae) in Central Amazon, Brazil

    OpenAIRE

    M. A. VILLACORTA-CORREA; Saint-Paul, U.

    1999-01-01

    Length, weight, structural index and sexual maturity in tambaqui Colossoma macropomum were analysed. 449 specimens were obtained from the commercial fishing fleet arriving at Manaus Harbour from the floodplain areas from May 1992 to July 1993. The objective of this study is to describe changes in structural index during one hidrological cycle and to interpret them according to the water level fluctuations and to also determine the time, reproductive period and length in sexual maturity. Sex r...

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

    OpenAIRE

    Marcos Tavares-Dias; Sérgio H.C. Schalch; Martins, Maurício L.; Eduardo M. Onaka; Flavio R. Moraes

    2000-01-01

    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 ...

  17. “SOU NEGRA, PONTO FINAL”: A CONSTRUÇÃO IDENTITÁRIA NEGRA FEMININA NA POÉTICA DE ALZIRA RUFINO

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    Douglas Rodrigues De Sousa

    2014-06-01

    Full Text Available Nas últimas décadas, o tema “literatura e identidade” tem ganhado maior notoriedade nos espaços de produção literários e acadêmicos. Isso inclui a renovação e o papel da nova poesia do século XX, em que se destaca o papel da poesia identitária. Vozes dos grupos excluídos da literatura utilizam-na como forma e função social de denúncia e apresentação das temáticas que revelam os preconceitos, lutas, anseios e percalços de quem está posto à margem das ordens estabelecidas. Nesse âmbito, empreendemos neste trabalho a leitura de alguns poemas do livro Eu, mulher negra, resisto (1988 da escritora afro-brasileira Alzira Rufino. Para tanto, percorremos vieses pelos quais a própria poesia da autora nos guiou, como o tema da literatura afro-brasileira, as relações identitárias, a memória negra e os elementos da cultura afro-brasileira. Como arcabouço teórico utilizamos autores como Bhabha (2010, Fanon (2008, Du Bois (1999, Munanga (1988, dentre outros, a fim de embasar a presente discussão.Palavras-chave: Literatura Afro-Brasileira. Poesia Negra. Identidade. Alzira Rufino. Abstract: On the last decades the theme “literature and identity” has acquired more notoriety in the areas of literary and academic production. This includes renovation and the function of the new poetry of 20th century, highlighting the poetry of identity. The voices of the excluded groups from Literature use it as social way and function to complain and present the themes that reveal the prejudices, fights, yearnings and difficulties of those who are putted aside of the established orders. In this context, in this study we did read some poetry from the book “I, black woman, resist” (1988 of the Afro-Brazilian writer Alzira Rufino. To do that, we traveled through the trends where the author’s poetry guided us, like the Afro-Brazilian literature, the identity relationships, the black memory and the Afro-Brazilian culture elements. For the

  18. Os objetos da identidade negra: consumo, mercantilização, globalização e a criação de culturas negras no Brasil

    Directory of Open Access Journals (Sweden)

    Livio Sansone

    2000-04-01

    Full Text Available O artigo descreve os itens usados no processo de mercantilização da cultura afro-baiana tradicional e daquela mais moderna. Trata-se de um processo de intercâmbio simbólico e material entre uma versão local da cultura negra, as culturas negras em outras regiões do Atlântico negro e, em época mais recente, a cultura negro-juvenil globalizada. Uma vez mercantilizados, os objetos negros viajam e, com freqüência, viajam muito e para longe. O artigo analisa também as características, as direções e as hierarquias envolvidas nesses intercâmbios entre centros e periferias do Atlântico negro. Baseado em pesquisa em Salvador e no Rio de Janeiro, o texto enfoca os jovens negro-mestiços de classe baixa e, em menor medida, o crescente número de negro-mestiços de classe média.The article focuses upon the items that have been used in the process of the commoditization of Afro-Bahian culture, both traditional and modern. It concerns symbolic and material exchanges amongst this manifestation of black culture, black cultures in other regions of the Black Atlantic and, over the last few decades, globalized youth culture. Once commoditized, "black objects" travel, often far and wide. This article also concerns itself with the qualities of these exchanges between centres and peripheries of the Black Atlantic, their direction and hierarchies implicit in them. Backed by fieldwork in Salvador and Rio de Janeiro, the article highlights the situation of lower-class black-mestizo young people and, to a lesser extent, the growing group of black-mestizos in a middle-class position.

  19. Mary Seacole e Maria Soldado: enfermeiras negras que fizeram história

    OpenAIRE

    Löw, Lily; Oguisso, Taka

    2014-01-01

    Este estudo tem por objetivos dar visibilidade a duas mulheres - Mary Jane Seacole e Maria Soldado - que sofreram racismo em suas ações, mas souberam desbravar as fronteiras do desconhecido, superá-las em busca dos ideais de suas vidas. Pretende-se através do método de pesquisa documental, resgatar a história dessas mulheres negras, posicionando-as como modelos da história profissional da enfermagem, colocando-as entre as precursoras da enfermagem moderna. Este estudio tiene por objetivos ...

  20. Professoras universitárias negras: trajetórias e narrativas Black female university professors: trajectories and narratives

    OpenAIRE

    Maria Aparecida dos Santos Crisostomo; Marcos Antonio dos Santos Reigota

    2010-01-01

    A presente investigação buscou analisar a condição de mulheres negras, docentes no ensino superior em universidades privadas da cidade de Sorocaba-SP, no período de 2000 a 2007, através de suas respectivas trajetórias e narrativas, articuladas em três aspectos: gênero, raça e escolaridade. Nosso objetivo foi verificar a inserção política e profissional da mulher negra, como docente, do Ensino Superior. A análise das narrativas de suas trajetórias e dos dados quantitativos que dispomos nos pos...

  1. Avaliação espermática pós-descongelamento em tambaqui, Colossoma macropomum (Cuvier, 1818) Sperm evaluation of tambaqui, Colossoma macropomum (Cuvier, 1818), after thawing

    OpenAIRE

    Jenner Tavares Bezerra Menezes; Luiz Jardim de Queiroz; Carolina Rodrigues da Costa Doria; Jaire Bezerra Menezes Jr

    2008-01-01

    Este estudo testa procedimentos de congelamento do sêmen de tambaqui, Colossoma macropomum , e eficiência na fertilização de ovócitos. Sêmen de um reprodutor induzido hormonalmente foi amostrado e armazenado em tubos de ensaio. O material foi diluído em soluções crioprotetoras (dimetilacetamida [DMA], dimetilsulfóxido [DMSO], metanol, propilenoglicol e etilenoglicol) (proporção de 1:3; sêmen:diluente), e submetido a procedimentos de rotina de congelamento. A motilidade foi avaliada antes e de...

  2. Seasonal variation of nutrients and energy in tambaqui's (Colossoma Macropomum Cuvier, 1818) natural food Variação sazonal de nutrientes e energia do alimento natural do tambaqui (Colossoma macropomum Cuvier, 1918)

    OpenAIRE

    J. A. M. da SILVA; PEREIRA-FILHO M.; M. I. de OLIVEIRA-PEREIRA

    2000-01-01

    The aim of this study was to evaluate the importance of fruits and seeds as food items in the natural diet of the tambaqui (Colossoma macropomum). During one year, tambaqui's stomach contents were collected, and their nutritional and energetic values were determined. During the flooding period, and while the river water was rising, which coincided with a high availability of fruits and seeds, the protein content of food was low (11%-15% of dry matter basis), whereas in the dry season, when ta...

  3. Gótico tropical y surrealismo. La novela negra de Caliwood

    Directory of Open Access Journals (Sweden)

    Marc Berdet

    2016-06-01

    Full Text Available En los años 1980, los cineastas colombianos Carlos Mayolo y Luis Ospina, emblemáticos del grupo de “Caliwood”, realizan películas de género bajo la bandera del “gótico tropical”, una estética fantástica que les permite criticar las relaciones de dominación coloniales y postcoloniales del Cono Sur. Antítesis de las fantasmagorías urbanas del capitalismo importado de Estados Unidos, estas fantasmagorías negras retoman el potencial subversivo de la novela negra inglesa tal y como fue reconocida por los surrealistas. Este texto explora su origen como un especie de reto lanzado en 1970 por Luis Buñuel a Álvaro Mutis, así como parte de la estética vampírica que ronda, en esos años, las historias del cinéfilo Andrés Caicedo.

  4. UVA/UVB-induced genotoxicity and lesion repair in Colossoma macropomum and Arapaima gigas Amazonian fish.

    Science.gov (United States)

    Groff, Aline Aparecida; da Silva, Juliana; Nunes, Emilene A; Ianistcki, Martus; Guecheva, Temenouga N; de Oliveira, Alzira Miranda; de Oliveira, Christiane Patrícia Feitosa; Val, Adalberto Luis; Henriques, João A P

    2010-05-01

    Ultraviolet radiation is known to cause adverse effects to aquatic species and aquatic environments. The fish Colossoma macropomum (tambaqui) and Arapaima gigas (pirarucu) live in the Amazon basin, near the Equator, and thus receive high intensity of ultraviolet radiation. Deforestation further aggravates the situation by reducing shade at ground level. The aim of this study was to evaluate the genotoxic effects of UVA and UVB radiation on erythrocytes of tambaqui and pirarucu fish using Micronuclei test and Comet assay. Our study showed that UV radiation caused DNA damage in both species as detected by Comet assay. In addition, there were differences in response to genotoxicity between both species, which are possibly related to their evolutionary history. Tambaqui fish exposed to ultraviolet radiation for different periods presented clear dose-response in DNA damage profile. Significant damage repair was observed 24h after cessation of ultraviolet radiation exposure. At the test conditions used, no significant increase in micronucleated cells was observed in tambaqui and pirarucu fish. Tambaqui proved to be more sensitive to ultraviolet radiation than Pirarucu, as detected by Comet assay, showing statistically higher baseline DNA damage. The present results demonstrated that alkaline Comet assay was very sensitive for detecting the UV-induced genotoxicity during the short exposure period in our study. In addition, the present study also suggests that tambaqui and pirarucu fish are useful sentinel organisms, as their UV sensitivity allows them to be effective monitors of biological hazards in the Amazon region. PMID:20338776

  5. Dietary tissue cadmium accumulation in an amazonian teleost (Tambaqui, Colossoma macropomum Cuvier, 1818).

    Science.gov (United States)

    Matsuo, A Y O; Val, A L

    2007-11-01

    Understanding the effects of metal contamination in the Amazon basin is important because of the potential impact on this region of high biodiversity. In addition, the significance of fish as the primary source of protein for the local human population (living either alongside the Amazon River or in the city of Manaus) highlights the need for information on the metal transfer through the food chain. Bioaccumulation of metals in fish can occur at significant rates through the dietary route, without necessarily resulting in death of the organism. The goal of this work was to expose an economic relevant species from the Amazon basin (tambaqui, Colossoma macropomum) to dietary cadmium (Cd) at concentrations of 0, 50, 100, 200, and 400 microg.g-1 dry food. Fish were sampled on days 15, 30, and 45 of the feeding trials. Tissues were collected for analysis of Cd concentration using graphite furnace atomic absorption spectrophotometry. Cd accumulation in the tissues occurred in the following order: kidney > liver > gills > muscle. Relative to other freshwater fish (e.g., rainbow trout, tilapia), tambaqui accumulated remarkably high levels of Cd in their tissues. Although Cd is known to affect Ca2+ homeostasis, no mortality or growth impairment occurred during feeding trials. PMID:18278317

  6. Performance of Tambaqui (Colossoma macropomum in Cages, under Different Percentage of Feeding

    Directory of Open Access Journals (Sweden)

    A. A. B. Pereira

    2014-03-01

    Full Text Available The aim of this study was to evaluate the performance of different rate in percentage feeding of the productivity (Body weight (BW and feed conversion (FC of juvenile tambaqui (Colossoma macropomum, with a total of 13500 animals, distributed in nine cages, with n = 1500 fish/cage, with three replicates in a period of four weeks. The animals were feed with   three treatments: treatment 1 (2% BW; treatment 2 ( 3% BW and treatment 3 (4% BW, divided in two meals,  and feed  with commercial food 36% crude protein. The BW gain was significantly higher for the animals that received feed rate of 4% BW. However, apparent feed conversion was better when used the rate of (2% BW- treatment 1 of tambaqui reared in cages.

  7. Purification, characterization and substrate specificity of a trypsin from the Amazonian fish tambaqui (Colossoma macropomum).

    Science.gov (United States)

    Marcuschi, Marina; Espósito, Talita S; Machado, Maurício F M; Hirata, Izaura Y; Machado, Marcelo F M; Silva, Márcia V; Carvalho, Luiz B; Oliveira, Vitor; Bezerra, Ranilson S

    2010-06-01

    An enzyme was purified from the pyloric caecum of tambaqui (Colossoma macropomum) through heat treatment, ammonium sulfate fractionation, Sephadex G-75 and p-aminobenzamidine-agarose affinity chromatography. The enzyme had a molecular mass of 23.9 kDa, NH(2)-terminal amino acid sequence of IVGGYECKAHSQPHVSLNI and substrate specificity for arginine at P1, efficiently hydrolizing substrates with leucine and lysine at P2 and serine and arginine at P1'. Using the substrate z-FR-MCA, the enzyme exhibited greatest activity at pH 9.0 and 50 degrees C, whereas, with BAPNA activity was higher in a pH range of 7.5-11.5 and at 70 degrees C. Moreover, the enzyme maintained ca. 60% of its activity after incubated for 3h at 60 degrees C. The enzymatic activity significantly decreased in the presence of TLCK, benzamidine (trypsin inhibitors) and PMSF (serine protease inhibitor). This source of trypsin may be an attractive alternative for the detergent and food industry. PMID:20438707

  8. Effects of subchronic manganese chloride exposure on tambaqui (Colossoma macropomum) tissues: oxidative stress and antioxidant defenses.

    Science.gov (United States)

    Gabriel, Diogo; Riffel, Ana Paula K; Finamor, Isabela A; Saccol, Etiane M H; Ourique, Giovana M; Goulart, Luis O; Kochhann, Daiani; Cunha, Mauro A; Garcia, Luciano O; Pavanato, Maria A; Val, Adalberto L; Baldisserotto, Bernardo; Llesuy, Susana F

    2013-05-01

    This study aimed to evaluate oxidative stress parameters in juvenile tambaqui (Colossoma macropomum) exposed to 3.88 mg l(-1) Mn(2+) for 96 hours. Biomarkers of oxidative stress, such as thiobarbituric acid reactive substances (TBARS), superoxide dismutase (SOD), catalase (CAT), and glutathione-S-transferase (GST) activities, as well as content of reduced glutathione (GSH), were analyzed in gill, liver, brain, and kidney. The presence of Mn(2+) in the water corresponded to increased levels of Mn(2+) accumulation according to the following sequence: gill > kidney > brain > liver. There was a significant increase in TBARS levels (40 %) and SOD activity (80 %) in addition to a significant decrease in GSH content (41 %) in gills of fish exposed to waterborne Mn(2+). In hepatic tissue of the exposed animals, TBARS levels decreased significantly (35 %), whereas SOD (82 %) and GST activities (51 %) as well as GSH content (43 %) increased significantly. In brain of exposed juvenile fish, only significant decreases in SOD (32 %) and CAT activities (65 %) were observed. Moreover, the kidney of exposed fish showed a significant increase in TBARS levels (53 %) and a significant decrease in SOD activity (41 %) compared with the control. Thus, the changes in biomarkers of oxidative stress were different in the tissues, showing a specific toxicity of this metal to each organ. PMID:23440445

  9. Effect of dichlorvos on the acetylcholinesterase from tambaqui (Colossoma macropomum) brain.

    Science.gov (United States)

    Assis, Caio Rodrigo Dias; Amaral, Ian Porto Gurgel; Castro, Patrícia Fernandes; Carvalho, Luiz Bezerra Júnior; Bezerra, Ranilson Souza

    2007-07-01

    Dichlorvos is an acutely toxic organophosphorous pesticide that is known as a classical acetylcholinesterase (AChE; EC 3.1.1.7) inhibitor. Here, the brain AChE from the important Amazonian fish tambaqui (Colossoma macropomum) was assayed in the presence of this insecticide and also of deltamethrin, a classical sodium and potassium channel inhibitor (negative control). Four tissue homogenates were analyzed in triplicate for AChE activity using acetylthiocholine as the substrate and 5,5'-dithiobis(2-nitrobenzoic) acid (DTNB) as the color-developing agent. Each tissue homogenate represented pooled brains from five fish. The inhibitory effect of dichlorvos on AChE activities was determined at concentrations from 0.001 to 10 ppm and compared to controls. This effect followed an exponential decay model (y = 9.420 + 26.192e(-x/5.380); r2 = 0.989), presenting IC50 (the concentration of dichlorvos that is required for 50% of AChE inhibition) of 0.081 ppm (0.368 micromol/L). No effect was observed for the deltamethrin, and the concentration 0.0452 micromol/L of dichlorvos was significantly different from this control. These results suggest that tambaqui brain AChE can be proposed as a biomarker for dichlorvos and can be used as a tool for aquatic environment monitoring. PMID:17665685

  10. Alterações post-mortem em tambaqui (Colossoma macropomum conservados em gelo

    Directory of Open Access Journals (Sweden)

    Almeida Neiva Maria de

    2006-01-01

    Full Text Available Este estudo apresenta a avaliação da qualidade de tambaqui (Colossoma macropomum conservado em gelo. Foi determinado o tempo de vida útil por meio de avaliações sensoriais e análises de pH e bases voláteis totais (N-BVT no músculo. A avaliação sensorial mostrou que os exemplares permaneceram com qualidade especial (Classe A durante o período de 22 dias e com boa qualidade (Classe B até 40 dias. A prova de degustação do peixe cozido mostrou que os exemplares permaneceram com qualidade especial (Classe A durante o período de 31 dias, mantendo-se na Classe B por até 40 dias. O pH e o N-BVT do músculo aumentaram regularmente com o tempo de estocagem, mostrando-se como índices adequados para determinar a qualidade do pescado. O extenso período em condições de consumo, 43 dias, permite que a espécie seja comercializada, entre camadas de gelo, no mercado nacional e internacional.

  11. The feeding activity of Colossoma macropomum larvae (tambaqui) in fishponds with water hyacinth (Eichhornia crassipes) fertilizer.

    Science.gov (United States)

    Sipaúba-Tavares, L H; Braga, F M S

    2007-08-01

    Analysis of macrophyte water hyacinth (Eichhornia crassipes) as an organic fertilizer of Colossoma macropomum (tambaqui) larvae in ponds is provided. Water hyacinth produce an organic fertilizer at the ratio of 100 g x m(-2) in tambaqui ponds. Two groups of 5,000 larvae were transferred to two fishponds with and without water hyacinth fertilizer and reared until day 43. The fertilized pond evidenced more plankton abundance during the entire production period when compared with the control pond (P 0.05) in both ponds (with and without organic fertilizer). Fish larvae failed to show any preference or selectivity in relation to the different algae (P > 0.01) in the pond, but exhibited high ingestion selectivity for zooplankton (P < 0.05). Application of fertilizer increased (P < 0.05) the abundance of phytoplankton and zooplankton in the treatment pond. Since water hyacinth fertilizer is quite cheap and easily available, it may be conveniently used to enhance fish yield in ponds. PMID:18094828

  12. Responses of digestive enzymes of tambaqui (Colossoma macropomum) to dietary cornstarch changes and metabolic inferences.

    Science.gov (United States)

    Corrêa, Cristina Ferro; de Aguiar, Lúcia Helena; Lundstedt, Lícia Maria; Moraes, Gilberto

    2007-08-01

    Digestive enzyme responses plus metabolic implications were studied in tambaqui (Colossoma macropomum) fed isoproteic diets containing 28% crude protein, 3300 kcal of gross energy/kg and different amounts of cornstarch (30, 40 and 50%). Amylase, maltase, acid protease, trypsin and chymotrypsin from the alimentary tract were assayed. Plasma, liver and white muscle metabolites were gauged to profile metabolism of the fish. The alimentary tract of tambaqui is compartmentalized morphologically and enzymatically. Amylase was present through the gut; acid protease was detected in stomach; maltase, trypsin and chymotrypsin were found in pyloric caeca and proximal and distal intestine sections. Increase of cornstarch levels from 40 to 50% in the diet resulted in an increase in amylase and maltase. Trypsin and chymotrypsin were unresponsive to starch levels. Acid protease follows the protein/carbohydrate ratio decrease. The increase of dietary cornstarch resulted in liver glycogenesis and the increase in plasma triglycerides is suggestive of lipogenesis. Digestive biochemical responses of tambaqui correlated with changes of feeding plus the analyses of metabolic profile are assumed as a tool for optimizing diet formulation and are a clue to other feeding optimizations for freshwater tropical species. PMID:17490905

  13. Innovative molecular approach to the identification of Colossoma macropomum and its hybrids.

    Science.gov (United States)

    Gomes, Fátima; Schneider, Horacio; Barros, Claudene; Sampaio, Dioniso; Hashimoto, Diogo; Porto-Foresti, Fábio; Sampaio, Iracilda

    2012-06-01

    Tambaqui (Colossoma macropomum) is the fish species most commonly raised in the Brazilian fish farms. The species is highly adaptable to captive conditions, and is both fast-growing and relatively fecund. In recent years, artificial breeding has produced hybrids with Characiform species, known as "Tambacu" and "Tambatinga". Identifying hybrids is a difficult process, given their morphological similarities with the parent species. This study presents an innovative molecular approach to the identification of hybrids based primarily on Multiplex PCR of a nuclear gene (α-Tropomyosin), which was tested on 93 specimens obtained from fish farms in northern Brazil. The sequencing of a 505-bp fragment of the Control Region (CR) permitted the identification of the maternal lineage of the specimen, all of which corresponded to C. macropomum. Unexpectedly, only two CR haplotype were found in 93 samples, a very low genetic diversity for the pisciculture of Tambaqui. Multiplex PCR identified 42 hybrids, in contrast with 23 identified by the supplier on the basis of external morphology. This innovative tool has considerable potential for the development of the Brazilian aquaculture, given the possibility of the systematic identification of the genetic traits of both fry-producing stocks, and the fry and juveniles raised in farms. PMID:22534749

  14. Antioxidant processes of the wild tambaqui, Colossoma macropomum (Osteichthyes, Serrasalmidae) from the Amazon.

    Science.gov (United States)

    Marcon, J L; Filho, D W

    1999-07-01

    Colossoma macropomum, locally called tambaqui, is a freshwater migratory teleost that shows good tolerance to oxygen and pH changes in water, and both chemical-physical parameters change markedly during the day time and seasonal water level oscillations in the Amazon Basin. In order to obtain a general view about the basal levels of antioxidants in different tissues of wild tambaqui, enzymatic (superoxide dismutase and catalase) and non-enzymatic (alpha-tocopherol, beta-carotene, and glutathione) antioxidants and lipid peroxidation levels were assessed in the liver, blood and plasma of ten specimens collected during the dry season (September) in a pond near Manaus-AM, Brazil. Superoxide dismutase, catalase, and lipid peroxidation levels were high in the liver and low in the blood and plasma. Confirming previous results on tambaqui, catalase was detected in the blood of one specimen only. beta-Carotene was not found in any analyzed tissue, while alpha-tocopherol was found only in the liver (7.8 +/- 7.0 nmol g(-1), mean +/- S.E.M.) and plasma (4.3 +/- 0.9 nmol ml(-1)). Blood glutathione concentrations (2.4 +/- 0.17 mmol l(-1)) of tambaqui were comparable with those found in other Amazonian teleosts. Antioxidant defenses and lipid peroxidation contents from liver. blood and plasma exhibited interesting correlations. These relationships suggest that antioxidant defenses located in different tissues and in different sub-cellular compartments act in concert. PMID:10530897

  15. Effects of afferent input on the breathing pattern continuum in the tambaqui (Colossoma macropomum).

    Science.gov (United States)

    Reid, Stephen G; Sundin, Lena; Florindo, Luis Henrique; Rantin, Francisco Tadeu; Milsom, William K

    2003-06-12

    This study used a decerebrate and artificially-ventilated preparation to examine the roles of various afferent inputs in breathing pattern formation in the tambaqui (Colossoma macropomum). Three general breathing patterns were observed: (1) regular breathing; (2) frequency cycling and (3) episodic breathing. Under normoxic, normocapnic conditions, 50% of control fish exhibited regular continuous breathing and 50% exhibited frequency cycling. Denervation of the gills and oro-branchial cavity promoted frequency cycling. Central denervation of the glossopharyngeal and vagus nerves produced episodic breathing. Regardless of the denervation state, hyperoxia produced either frequency cycling or episodic breathing while hypoxia and hypercarbia shifted the pattern to frequency cycling and continuous breathing. We suggest that these breathing patterns represent a continuum from continuous to episodic breathing with waxing and waning occupying an intermediate stage. The data further suggest that breathing pattern is influenced by both specific afferent input from chemoreceptors and generalised afferent input while chemoreceptors specific for producing changes in breathing pattern may exist in fish. PMID:12809797

  16. Functional integrity of Colossoma macropomum (Cuvier, 1816 sperm cryopreserved with enriched extender solutions

    Directory of Open Access Journals (Sweden)

    Raycon Roberto Freitas Garcia

    2015-09-01

    Full Text Available Cryoprotectant solutions are used to protect the sperm from alterations caused by the low temperature in the cryopreservation process. We evaluated the quality of Colossoma macropomum semen after freezing, using dimethyl sulfoxide (DMSO as a cryoprotectant, combined with two extender solutions (T1 - Solution 1: Glucose 90.0 g/L, Sodium Citrate 6.0 g/L, EDTA 1.5 g/L, Sodium Bicarbonate 1.5 g/L, Potassium Chloride 0.8 g/L, Gentamycin Sulphate 0.2 g/L, and T2 - Solution 2: Glucose 90.0 g/L, ACP(r-104 10.0 g/L. Motility rate and motility time did not differ between T1 and T2 and were lower than fresh semen. The number of normal sperm was significantly different in treatments T1 (15.1% and T2 (21.9%, and both showed a reduction in the percentage of normal sperm compared to fresh semen (57.4%. The values found for the rates of fertilization and hatching, mitochondrial functionality and sperm DNA, did not differ between the treatments (T1 and T2. Regarding membrane integrity, there was a higher percentage of spermatozoa with intact membranes in T1 (53.4% than T2 (43.7%. The extender solutions, combined with 10% DMSO, maintained the sperm DNA intact in almost all the C. macropomumsperm cells, however there was a loss in their functionality.

  17. Differential expression of a retrotransposable element, Rex6, in Colossoma macropomum fish from different Amazonian environments.

    Science.gov (United States)

    Barbosa, Cassiane Martins; Mareco, Edson Assunção; Silva, Maeli Dal Pai; Martins, Cesar; Alves-Costa, Fernanda Antunes

    2014-01-01

    Transposable elements (TEs) are DNA sequences that have the ability to move and replicate within the genomes. TEs can be classified according to their intermediates of transposition, RNA (retrotransposons) or DNA. In some aquatic organisms, it has been observed that environmental factors such as pH, temperature and pollution may stimulate differential transcription and mobilization of retrotransposons. In light of this information, the present study sought to evaluate the expression of Rex6 TE transcripts in Colossoma macropomum, which is a very commercially exploited fish in Brazil. In order to establish a comparative analysis using real-time PCR, the samples were collected from Amazonian rivers with different physical and chemical characteristics (distinguished by clear water and black water). Quantitative RT-PCR analyses revealed a differential pattern of expression between tissues collected from different types of water (clear and black waters). When it came to the hepatic and muscle tissues sampled, the levels of Rex6 transcripts were significantly different between the two Amazonian water types. These results suggest that environmental conditions operate differently in the regulation of Rex6 transcription in C. macropomum, results which have implications in the reshaping of the genome against environmental variations. PMID:25089227

  18. VALOR AGREGADO DE LAS ESPECIES Brycon erythropterum (SÁBALO), Colossoma macropomum (GAMITANA), Arapaima gigas (PAICHE) y Agouti paca (MAJAS)

    OpenAIRE

    Doylith Vásquez Jurafo; Cinthya Córdova Ríos; Wendy Olórtegui Morey; Nirsa Cachique Oliveira; Luis Silva Ramos; Ricardo García Pinchi

    2012-01-01

    El presente trabajo tiene como objetivo  la obtención de  productos mínimamente procesados (PMP) de Brycon erythropterum (SÁBALO), Colossoma macropomum (GAMITANA), Arapaima gigas (PAICHE), y Agouti paca (MAJAS) congelado y empacado al vacio. Para las especies piscícolas, se ha aplicado un diseño factorial de 32 con dos factores de estudios: concentración de NaCl en la solución osmótica con tres niveles (15, 20 y 25 %) y temperatura de proceso  con tres niveles de estudio (5, 10 y 15 °C). Para...

  19. Tiempo de latencia para semen colectado de Colossoma macropomum “Gamitana” en solución sacarosa

    OpenAIRE

    Ehrlich Llasaca-Calizaya; Juvenal Napuchi-Linares; Lorgio Verdi-Olivares; Jesús Núñez-Rodríguez

    2015-01-01

    El objetivo fue estimar el tiempo de latencia (almacenamiento), para el semen de Colossoma macropomum, “gamitana” en solución de 400 mM de Sacarosa. Se consideró aceptable los niveles de motilidad superiores al 40%, lo cual garantiza eficientes tasas de fertilización. Para el desarrollo del experimento se colectó 2 lotes de semen inmótiles de gamitana (inducidos con Conceptal®), los cuales posteriormente fueron activados con agua destilada. El primer lote estuvo constituido por semen en sacar...

  20. 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.

  1. Microsatellite markers for the tambaqui (Colossoma macropomum, Serrasalmidae, Characiformes), an economically important keystone species of the Amazon River floodplain.

    Science.gov (United States)

    Santos, Maria D Conceição F; Hrbek, Tomas; Farias, Izeni P

    2009-05-01

    Colossoma macropomum is a keystone species of the Amazon floodplain, and is an important but severely overexploited commercial species. To provide tools for addressing ecological and conservation questions, we developed 14 highly polymorphic microsatellite markers that had between four and 21 alleles per locus in the 25 tested individuals. With the exception of comparisons involving the locus Cm1F5 that also showed heterozygosity deficiency, no pairs of loci were at linkage disequilibrium. Many of the microsatellite loci were also variable in three other serrasalmid species which span the phylogenetic depth of the Serrasalmidae. PMID:21564774

  2. Short Term Changes in Shear Wave Splitting at Sierra Negra Volcano, 2010: Possible Indicator of a Magmatic Intrusion

    Science.gov (United States)

    Anzieta, J. C.; Ruiz, M. C.; Ebinger, C. J.; Geist, D.

    2012-12-01

    The Sierra Negra volcano, Galapagos, is a basaltic shield volcano with the largest caldera (7x10 km) in the islands. Frequent eruptions have been dated, with a time interval between them typically in the order of decades (7 were confirmed in the last century), the last one occurred in 2005. We present new results from a shear wave splitting study performed at Sierra Negra volcano using nearly two years (Aug 2009-Jun 2011) of data obtained from SIGNET (Sierra Negra Integrated Geophysical Network) project. Changes in fast shear wave polarity are detected during the period of 4-10 June 2010, which are interpreted as the result of a crustal (6-10 km) magmatic intrusion event. The goal of this study was to determine the state of crustal stress at and around Sierra Negra in order to establish how different possible stress sources (i.e. the Galapagos spreading center, the Nazca plate movement along the insular platform, the loads of Sierra Negra and its interaction with nearby active volcanoes) are controlling volcanism within the region, as well as to test the method as a potential tool for detecting and forecasting changes in eruptive activity. Shear wave splitting (SWS) is an indicator of seismic anisotropy and is expected in volcanic regions as explained by extensive-dilatancy anisotropy (EDA) theory. Thus, we selected the SWS method to identify the local and regional state of stress. In stations far from the caldera two regional main stress directions are determined, oriented N-S or E-W, which may be associated with either the influence of the Galapagos spreading center or to the Nazca plate movement respectively. SWS results around the caldera were stable and agreed with radial or circumferential fissure strikes. During the 4-10 June 2010 however, daily seismic event rates increased reaching average monthly event numbers in just a few days. The majority of these events were located in the southeastern part of Sierra Negra's edifice. In this period the polarization

  3. Gomose da acácia-negra causada por Ceratocystis fimbriata Ell. & Halst. Gummosis of Acacia decurrens Willd. Caused by Ceratocystis fimbriata Ell. & Halst.

    OpenAIRE

    Ivan José Antunes Ribeiro; Margarida Fumikoito; Osvaldo Paradela Filho; Jairo Lopes de Castro

    1988-01-01

    É relatada a ocorrência, pela primeira vez no Brasil, de Ceratocystis fimbriata Ell. & Halst. sobre acácia-negra. Testes de inoculação cruzada foram efetuados em casa de vegetação com o isolado obtido de acácia-negra (Acacia decurrens Willd.) e outro de mangueira (Mangifera indica L.). Observou-se que ambos os isolados foram patogênicos à acácia-negra e à mangueira.Several plants of Acacia decurrens showed wilting and subsequent branche drying. The branches showed wood splitting and gum exuda...

  4. Innovative molecular approach to the identification of Colossoma macropomum and its hybrids

    Directory of Open Access Journals (Sweden)

    Fátima Gomes

    2012-06-01

    Full Text Available Tambaqui (Colossoma macropomum is the fish species most commonly raised in the Brazilian fish farms. The species is highly adaptable to captive conditions, and is both fast-growing and relatively fecund. In recent years, artificial breeding has produced hybrids with Characiform species, known as "Tambacu" and "Tambatinga". Identifying hybrids is a difficult process, given their morphological similarities with the parent species. This study presents an innovative molecular approach to the identification of hybrids based primarily on Multiplex PCR of a nuclear gene (α-Tropomyosin, which was tested on 93 specimens obtained from fish farms in northern Brazil. The sequencing of a 505-bp fragment of the Control Region (CR permitted the identification of the maternal lineage of the specimen, all of which corresponded to C. macropomum. Unexpectedly, only two CR haplotype were found in 93 samples, a very low genetic diversity for the pisciculture of Tambaqui. Multiplex PCR identified 42 hybrids, in contrast with 23 identified by the supplier on the basis of external morphology. This innovative tool has considerable potential for the development of the Brazilian aquaculture, given the possibility of the systematic identification of the genetic traits of both fry-producing stocks, and the fry and juveniles raised in farms.O Tambaqui (Colossoma macropomum é a espécie de peixe mais comumente cultivada em pisciculturas no Brasil. A espécie é altamente adaptada às condições de cativeiro, apresentando rápido crescimento e alta fecundidade. Nos últimos anos tem ocorrido o cruzamento artificial entre espécies de Characiformes, produzindo os híbridos "Tambacu" e "Tambatinga". A identificação de híbridos é uma tarefa difícil, em virtude da grande similaridade morfológica entre as espécies parentais. O presente estudo apresenta uma abordagem molecular inovadora para identificação de híbridos com base em PCR Multiplex de um gene nuclear (

  5. Flashblack MTV: sem retorno à música negra na família da MTV

    Directory of Open Access Journals (Sweden)

    Paula Rodríguez Marino

    2001-01-01

    Full Text Available Analiza-se a construções dos conceitos de juventud, família e "música negra" (black music no programa Flashblack do canal MTV Brasil, a partir das reflexões e categorias utilizadas pela pesquisadora brasileira Ida Lúcia Machado e pelo pesquisador argentino Eliseo Verón. Desta forma, é possível estudar o corpus estabelecendo um paralelo entre os movimentos e angulações de câmara e a proxêmica, e também, precissar as modalidades do apresentador em função de outros aspectos do comportamento verbais e não verbais.

  6. 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.

  7. Impacts of stocking on the genetic diversity of Colossoma macropomum in central Amazon, Brazil.

    Science.gov (United States)

    de Queiroz, C A; Sousa, N R; da Silva, G F; Inoue, L A K A

    2016-01-01

    Tambaqui (Colossoma macropomum) is the main fish species farmed on a commercial scale in northern Brazil. In view of the current scenario of Brazilian aquaculture, studies on the genetic improvement and reproductive management of captive tambaqui are crucial in identifying the genetic variability of broodstocks and devising management practices. Genetic diversity of three tambaqui broodstocks in western Amazon was evaluated using molecular markers. Fin samples were collected from 89 fish; 38 from Balbina, 30 from a hatchery in Rio Preto da Eva, and 21 from the experimental farm of the Federal University of Amazonas (UFAM). Ten primers were used for the analysis of diversity and genetic structure. Of the 152 bands produced, 146 were polymorphic. The proportion of polymorphic loci showed little variation among the three stocks. The lowest and highest rates were found in the Rio Preto da Eva (80.92%) and Balbina (85.53%) stocks, respectively. Heterozygosity (H) and Shannon (I) indices were similar among the stocks; the lowest values were found in Balbina (H = 0.279 and I = 0.419), and the highest in UFAM (H = 0.294 and I = 0.439). Following analysis of the genetic structure and relationship, the sample was divided into two groups, with the Balbina stock clearly deviating from the others. The results suggest that, to increase genetic variability, molecular information may be used instead of replacement of wild breeders. The groups characterized here can be used in genetic improvement programs with other tambaqui broodstocks from different areas of South America. PMID:27173205

  8. [Histology of gill, liver and kidney in juvenile fish Colossoma macropomum exposed to three temperatures].

    Science.gov (United States)

    Rojas, Luz-Marina; Mata, Claunis; Oliveros, Aridays; Salazar-Lugo, Raquel

    2013-06-01

    Abstract: Histology of gill, liver and kidney in juvenile fish Colossoma macropomum exposed to three temperatures. Water temperature is an important factor that affects growth and antioxidant enzyme activities in fish, and when adverse, it may trigger diseases in fish populations. C. macropomum is a freshwater neotropical fish widely distributed in South America and abundant in river basins as the Amazon and Orinoco. It is highly used for intensive aquaculture development and is a very important product for the local riverside economy in Venezuela. The purpose of our study was to examine the water temperature effect on gills, liver and kidneys of juvenile fishes of C macropomum. Eighteen juveniles with biometrical index of 17.87 +/- 7.88 cm and 87.69 +/- 34.23 g were respectively exposed to three culture temperatures (T18, T29 and T35 degrees C) during a period of 21 days. Histological analyses on gills, liver and kidney were made according to standard methodologies. Our results showed that these tissues exhibited normal citoarchitecture at T29. On the contrary, T18-gills displayed brachiallipid droplets inside brachial epithelium; and disorganization in the brachial tissue was observed at T35. Furthermore, we observed two kinds of hepatocytes (dark and light) on T180 degrees C-liver. The T35-liver samples showed cytoplasmatic granulation and damages in cytoplasmatic membrane. Kidney samples from T18 observed alterations in the cellular distribution of the hematopoietic tissue; while, at T35, the most important feature observed was the disorganization of the glomerular structure. We concluded that T18 and T35 are respectively critical and severe temperatures to C. macropomum; besides, the most sensible tissues to changes induced by temperature in this species were the liver and gills. PMID:23885590

  9. Branchial receptors and cardiorespiratory reflexes in a neotropical fish, the tambaqui (Colossoma macropomum).

    Science.gov (United States)

    Sundin, L; Reid, S G; Rantin, F T; Milsom, W K

    2000-04-01

    This study examined the location and physiological roles of branchial chemoreceptors involved in the cardiorespiratory responses to hypoxia and hypercarbia in a neotropical fish that exhibits aquatic surface respiration, the tambaqui (Colossoma macropomum). Fish were exposed to abrupt progressive environmental hypoxia (18. 6-1.3 kPa water P(O2)) and hypercarbia (water equilibrated with 5 % CO(2) in air, which lowered the water pH from 7.0 to 5.0). They were also subjected to injections of NaCN into the ventral aorta (to stimulate receptors monitoring the blood) and buccal cavity (to stimulate receptors monitoring the respiratory water). All tests were performed before and after selective denervation of branchial branches of cranial nerves IX and X to the gill arches. The data suggest that the O(2) receptors eliciting reflex bradycardia and increases in breathing frequency are situated on all gill arches and sense changes in both the blood and respiratory water and that the O(2) receptors triggering the elevation in systemic vascular resistance, breathing amplitude, swelling of the inferior lip and that induce aquatic surface respiration during hypoxia are extrabranchial, although branchial receptors also contribute to the latter two responses. Hypercarbia also produced bradycardia and increases in breathing frequency, as well as hypertension, and, while the data suggest that there may be receptors uniquely sensitive to changes in CO(2)/pH involved in cardiorespiratory control, this is based on quantitative rather than qualitative differences in receptor responses. These data reveal yet another novel combination for the distribution of cardiorespiratory chemoreceptors in fish from which teleologically satisfying trends have yet to emerge. PMID:10708642

  10. Use of cryotubes for the cryopreservation of tambaqui fish semen (Colossoma macropomum).

    Science.gov (United States)

    Maria, Alexandre Nizio; Carvalho, Allan Charles Marques; Araújo, Rafael Venâncio; Santos, Jadson Pinheiro; Carneiro, Paulo César Falanghe; Azevedo, Hymerson Costa

    2015-04-01

    Tambaqui (Colossoma macropomum) is a freshwater fish of great importance to aquaculture in several South American countries. Recent studies have developed a protocol for semen cryopreservation in 0.25 and 0.5 mL straws; however, this technique has limitations for fingerling production at a large scale due to the high fecundity of tambaqui. The main objective of this study was to evaluate the feasibility of using cryotubes (1.6 and 4.5 mL) for tambaqui semen cryopreservation. Semen samples were diluted in freezing solution (5% glucose solution, 10% methylglycol, 5% egg yolk), stored in 1.6 and 4.5 mL cryotubes, frozen in liquid nitrogen vapor at -175°C and transferred to a cryogenic container at -196°C. The cryotubes were thawed in a water bath at 60°C for 70 or 90 s and the motility (total motility - TM; progressive motility - PM; curvilinear velocity - VCL; straight line velocity - VSL and average path velocity - VAP) and the viability of sperm were evaluated. There was no significant difference in sperm motility and viability post-thawing between 1.6 and 4.5m L cryotubes, except for TM (47% and 40%, respectively). Thawing for 90 s provided better results, being used in fertilization trials. Although the fertilization rate did not differ between the cryotubes (41-45%), it was significantly lower than that for fresh semen (74%). A strong positive correlation was observed between the sperm motility and fertilization rate (r=0.69-0.89). We conclude that 1.6 and 4.5 mL cryotubes have high potential for tambaqui semen cryopreservation when thawed for a minimum time of 90 s at 60°C. PMID:25725470

  11. Loss of genetic diversity in farmed populations of Colossoma macropomum estimated by microsatellites.

    Science.gov (United States)

    Santos, C H A; Santana, G X; Sá Leitão, C S; Paula-Silva, M N; Almeida-Val, V M F

    2016-06-01

    The genetic variability of four Colossoma macropomum broodstocks, three from fish farms in different regions and one from the natural environment in Brazil, was analyzed using microsatellite markers. The wild progeny (n = 30) were caught in the Solimões-Amazonas River, at the varzea lakes; this location is used to mature the fish from larvae to juveniles. The three fish farms were selected according to the age of their lineages and broodstock availability: DNOCS (n = 21) is located in the Ceará State, representing the oldest lineage of cultivated tambaqui in Brazil; Balbina (n = 30) is located in the Amazonas State, representing the youngest stocks of tambaqui farmed in Brazil (approximately 15 years); and UFRPE (n = 30) is located in the Pernambuco State and is considered to be a mixed stock formed from the DNOCS and Balbina lineages. The analysis of 13 microsatellite loci indicated the occurrence of a variability reduction in the farmed populations; the UFRPE stock was the population with the highest diversity level. Low values of molecular coancestry were found in these populations. Additionally, significant differences in the RST values among the populations were detected, as was the occurrence of genetic structure. The genetic loss found in these populations may have been influenced by the founder effect. Because no breeding programs were during the entire production period and no pedigree records were kept for these broodstocks, we suggest that a wild population might be used as an important genetic resource to increase the genetic diversity of renewal stock lineages. PMID:26970241

  12. A preliminary market research about tambaqui (Colossoma macropomum in Costa Rica (ESP

    Directory of Open Access Journals (Sweden)

    Raymon van Anrooy

    2016-03-01

    Full Text Available From January to July 1995, a market trial was conducted in Costa Rica with the fresh water fish species. Colossoma macropomum, commonly named “tambaqui”. About 1200 fish with an average weight of 800g were obtained from the fish culture station of the Universidad Nacional near La Rita, Guápiles. About 20 fish were delivered each Monday initially to three and later to each of four fishdealers in Limón, Guápiles, San José and Heredia. The shopkeepers purchased the fish at a price of $1.40/kg, covering all production and transport costs, and sold it for $1.97/kg. The motivations of the consumers for purchasing the fish were: curiosity, low price, good taste and recommendations by the shopkeepers. Most of the participants appreciated the taste, meat texture, freshness, colour and appearance very much. Some repondents criticized the amount of intramuscular spines in the fish. Eighty nine percent of the consumers intended to purchase more of the fish and 38% preferred this fish species above all other species. There was no effect (p > 0.05 of gender, householdsize or income level on the responses of the costumers. Chinese costumers were the only group discernible in the survey. Almost all participants thought tambaqui could get a good market position in Costa Rica. This trial shows that the price can be increased a little without losing much customers, but promotion would be necessary to get the product more known among the Costa Rican Population. The production of tambaqui could meet part of the demand for low priced fish in Costa Rica.

  13. Exigência protéica de juvenis de tambaqui (Colossoma macropomum) após privação alimentar Protein requirement of tambaqui juveniles (Colossoma macropomum) after feed deprivation

    OpenAIRE

    Luciana Santos; Manoel Pereira Filho; Cássia Sobreira; Daniel Ituassú; Flávio Augusto Leão da Fonseca

    2010-01-01

    O objetivo deste trabalho foi avaliar a exigência protéica de juvenis de tambaqui (Colossoma macropomum) após a privação alimentar. Os peixes (50,3 ± 0,26g) foram submetidos a quatro rações isoenergéticas com diferentes concentrações protéicas (28, 32, 36 e 40% proteína bruta) e dois regimes alimentares (com privação e sem privação) durante 60 dias. O delineamento experimental foi inteiramente casualizado, em esquema fatorial 4x2, em triplicata. Avaliaram-se os parâmetros de qualidade de água...

  14. Uso do probiótico Efinol®L durante o transporte de tambaqui (Colossoma macropomum) The use of probiotic Efinol®L during transportation of tambaqui (Colossoma macropomum)

    OpenAIRE

    E.S. Carvalho; L.C. Gomes; F.R. Brandão; R. Crescêncio; E.C. Chagas; A.A.S. Anselmo

    2009-01-01

    Verificou-se a eficácia da adição de um probiótico potencialmente redutor de estresse, durante o transporte de juvenis de tambaqui (Colossoma macropomum). Os peixes foram transportados em sacos plásticos com probiótico (20mg/L) ou sem adição do produto à água. O transporte teve duração de 16 horas. Após o transporte, os peixes foram colocados em caixas de 150L para monitorar a recuperação por 96 horas. Para o monitoramento do estresse, avaliaram-se a glicose, o hematócrito e a hemoglobina, al...

  15. Determinação da dose inseminante e embriogênese na fertilização artificial de tambaqui (Colossoma macropomum) Determination of insemination dose and embryonic development in the artificial fertilization of tambaqui (Colossoma macropomum)

    OpenAIRE

    L.V. Leite; M.A.P. Melo; F.C.E. Oliveira; J.P.S. Pinheiro; C.C. Campello; J.F. Nunes; C.S.B. Salmito-Vanderley

    2013-01-01

    Determinou-se a dose inseminante para fertilização artificial e descreveu-se o desenvolvimento embrionário de tambaqui (Colossoma macropomum). Os gametas foram coletados de reprodutores induzidos hormonalmente. Foi realizada fertilização artificial nas proporções de espermatozoides/ovócito de D1-50.666; D2-75.999; D3-101.332; D4-126.665; D5-151.998. O desenvolvimento embrionário foi acompanhado por meio de observações periódicas em estereoscópio até a eclosão dos ovos. Na fase de fechamento d...

  16. Cardiorespiratory responses to hypercarbia in tambaqui Colossoma macropomum: chemoreceptor orientation and specificity.

    Science.gov (United States)

    Gilmour, K M; Milsom, W K; Rantin, F T; Reid, S G; Perry, S F

    2005-03-01

    Experiments were carried out to test the hypothesis that ventilatory and cardiovascular responses to hypercarbia (elevated water P(CO2)) in the tambaqui Colossoma macropomum are stimulated by externally oriented receptors that are sensitive to water CO(2) tension as opposed to water pH. Cardiorespiratory responses to acute hypercarbia were evaluated in both the absence and presence of internal hypercarbia (elevated blood P(CO2)), achieved by treating fish with the carbonic anhydrase inhibitor acetazolamide. Exposure to acute hypercarbia (15 min at each level, final water CO(2) tensions of 7.2, 15.5 and 26.3 mmHg) elicited significant increases in ventilation frequency (at 26.3 mmHg, a 42% increase over the normocarbic value) and amplitude (128%), together with a fall in heart rate (35%) and an increase in cardiac stroke volume (62%). Rapid washout of CO(2) from the water reversed these effects, and the timing of the changes in cardiorespiratory variables corresponded more closely to the fall in water P(CO2) (Pw(CO2)) than to that in blood P(CO2) (Pa(CO2)). Similar responses to acute hypercarbia (15 min, final Pw(CO2) of 13.6 mmHg) were observed in acetazolamide-treated (30 mg kg(-1)) tambaqui. Acetazolamide treatment itself, however, increased Pa(CO2) (from 4.81+/-0.58 to 13.83+/-0.91 mmHg, mean +/-S.E.M.; N=8) in the absence of significant change in ventilation, heart rate or cardiac stroke volume. The lack of response to changes in blood P(CO2) and/or pH were confirmed by comparing responses to the bolus injection of hypercarbic saline (5% or 10% CO(2); 2 ml kg(-1)) into the caudal vein with those to the injection of CO(2)-enriched water (1%, 3%, 5% or 10% CO(2); 50 ml kg(-1)) into the buccal cavity. Whereas injections of hypercarbic saline were ineffective in eliciting cardiorespiratory responses, changes in ventilation and cardiovascular parameters accompanied injection of CO(2)-laden water into the mouth. Similar injections of CO(2)-free water acidified to the

  17. Extrabranchial chemoreceptors involved in respiratory reflexes in the neotropical fish Colossoma macropomum (the tambaqui).

    Science.gov (United States)

    Milsom, William K; Reid, Stephen G; Rantin, F Tadeu; Sundin, Lena

    2002-06-01

    In a previous study, complete denervation of the gills in the tambaqui Colossoma macropomum did not eliminate the increase in breathing amplitude seen during exposure of this species to hypoxia. The present study was designed to examine other sites of putative O(2)-sensitive receptors that could be involved in this reflex action. Superfusion of the exposed brain of decerebrate, spinalectomized fish did not reveal the presence of central chemoreceptors responsive to hyperoxic, hypoxic, hypercarbic, acidic or alkaline solutions. Subsequent central transection of cranial nerve IX and X, removing not only all innervation of the gills but also sensory input from the lateral-line, cardiac and visceral branches of the vagus nerve, did not eliminate the increase in breathing amplitude that remained following peripheral gill denervation alone. Administration of exogenous catecholamines (10 and 100 nmol kg(-1) adrenaline) to fish with intact brains and minimal surgical preparation reduced both respiratory frequency and amplitude, suggesting that humoral release of adrenaline also could not be responsible for the increase in breathing amplitude that remained following gill denervation. Denervation of the mandibular branches of cranial nerve V and the opercular and palatine branches of cranial nerve VII in gill-denervated fish (either peripheral gill denervation or central section of cranial nerves IX and X), however, did eliminate the response. Thus, our data suggest that hypoxic and hyperoxic ventilatory responses as well as ventilatory responses to internal and external injections of NaCN in the tambaqui arise from O(2)-sensitive receptors in the orobranchial cavity innervated by cranial nerves V and VII and O(2)-sensitive receptors on the gills innervated by cranial nerves IX and X. Our results also revealed the presence of receptors in the gills that account for all of the increase in ventilation amplitude and part of the increase in ventilation frequency during hyperoxic

  18. Estrutura morfológica do fígado de tambaqui Colossoma macropomum (Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Gerlane de Medeiros Costa

    2012-09-01

    Full Text Available Este trabalho teve como objetivo descrever macro e microscopicamente o fígado do Tambaqui Colossoma macropomum, Teleósteo de água doce da Família Characidae, de grande interesse econômico da bacia Amazônica. Foram utilizados seis (6 exemplares jovens com idade entre seis meses e um ano, oriundos da Chácara Esteio, Alta Floresta, MT, que desenvolve principalmente a prática da piscicultura. O órgão foi fotodocumentado in situ e descrito macroscopicamente, em seguida procedeu-se a retirada de fragmentos deste, que foram processados pelas técnicas histológicas rotineiras para inclusão em parafina e coloração de HE. O fígado localizou-se ventral à bexiga natatória e craniodorsalmente ao estômago, apresentou coloração amarronzada a vermelho, constituído por três lobos hepáticos, o lobo lateral direito, o lobo lateral esquerdo e o lobo ventral. Microscopicamente, o parênquima era constituído por hepatócitos com formato que variou do arredondado irregular hexagonal ao redondo com núcleo grande e central, arranjados em cordões lineares limitados por sinusóides que irradiam para veias centrais, e com ausência de lóbulos hepáticos. As veias centrais estavam distribuídas pelo parênquima, enquanto que o espaço porta, na maioria das vezes, era constituído apenas por uma veia hepática e o ducto biliar, em outros locais foi observado, uma artéria e um ducto. Não foi observada a formação de tríades portais. Foram frequentemente observados melano macrófagos centrais dispersos pelo parênquima. O estudo morfofuncional do Aparelho Digestório de peixes da bacia Amazônica, se faz pertinente com vistas ao conhecimento do aproveitamento de ganho de peso e produção em alta escala para consumo humano e preservação da espécie, além da importância de estarem sendo utilizados como bioindicadores atualmente.

  19. Studies of micronuclei and other nuclear abnormalities in red blood cells of Colossoma macropomum exposed to methylmercury

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    Carlos Alberto Machado da Rocha

    2011-01-01

    Full Text Available The frequencies of micronuclei (MN and morphological nuclear abnormalities (NA in erythrocytes in the peripheral blood of tambaqui (Colossoma macropomum, treated with 2 mg.L-1 methylmercury (MeHg, were analyzed. Two groups (nine specimens in each were exposed to MeHg for different periods (group A - 24 h; group B - 120 h. A third group served as negative control (group C, untreated; n = 9. Although, when compared to the control group there were no significant differences in MN frequency in the treated groups, for NA, the differences between the frequencies of group B (treated for 120 h and the control group were extremely significant (p < 0.02, thus demonstrating the potentially adverse effects of MeHg on C. macropomum erythrocytes after prolonged exposure.

  20. Linking hematological, biochemical, genotoxic, and behavioral responses to crude oil in the Amazon fish Colossoma macropomum (Cuvier, 1816).

    Science.gov (United States)

    Kochhann, Daiani; de Azevedo Brust, Sandra Maristher; Domingos, Fabíola Xochilt Valdez; Val, Adalberto Luis

    2013-08-01

    Despite safety protocols, crude oil extraction and transportation in the Amazon basin has a potential for inadvertent oil spills, which can impact aquatic organisms in local rivers. The objective of this study was to assess the effects of crude oil on juvenile Amazonian fish tambaqui, Colossoma macropomum, at various biological levels. Furthermore, the effect of crude oil on response to alarm substance, an important communication system in fish, was reported for the first time. Fish exposed to crude oil showed a 90 % decrease in their response to alarm substance and a 60 % decrease in swimming activity relative to control fish. Basic hematology was not affected, although an increase of 200 % of DNA damage and an increase of GST activity were observed in animals exposed to crude oil. Inverse correlations were found between genotoxicity end points and behavioral parameters, suggesting that genotoxic end points can also reflect behavioral changes. PMID:23539120

  1. Studies of micronuclei and other nuclear abnormalities in red blood cells of Colossoma macropomum exposed to methylmercury.

    Science.gov (United States)

    da Rocha, Carlos Alberto Machado; da Cunha, Lorena Araújo; da Silva Pinheiro, Raul Henrique; de Oliveira Bahia, Marcelo; Burbano, Rommel Mario Rodríguez

    2011-10-01

    The frequencies of micronuclei (MN) and morphological nuclear abnormalities (NA) in erythrocytes in the peripheral blood of tambaqui (Colossoma macropomum), treated with 2 mg.L(-1) methylmercury (MeHg), were analyzed. Two groups (nine specimens in each) were exposed to MeHg for different periods (group A - 24 h; group B - 120 h). A third group served as negative control (group C, untreated; n = 9). Although, when compared to the control group there were no significant differences in MN frequency in the treated groups, for NA, the differences between the frequencies of group B (treated for 120 h) and the control group were extremely significant (p macropomum erythrocytes after prolonged exposure. PMID:22215976

  2. Histopathological changes in gill, liver and kidney of neotropical fish Colossoma macropomum exposed to paraquat at different temperatures.

    Science.gov (United States)

    Salazar-Lugo, Raquel; Mata, Claunis; Oliveros, Aridays; Rojas, Luz Marina; Lemus, Mairin; Rojas-Villarroel, Evelin

    2011-05-01

    This work focused on the histological alterations in gill, liver and kidney of fish Colossoma macropomum exposed to different temperatures (18°C, 29°C, 35°C) with 10mg/L of herbicide Paraquat (PQ), during 21 days. The fish exhibited histopathological changes in these tissues; the most important alteration in gills was telangiectasis. Liver showed debris accumulation inside cytoplasm hepatocytes, karyolysis, karyohesis and a decrease in the size of sinusoids. Hyperplasia of melanomacrophagic centers (MMC) and an increase in basophils were observed in kidney. The lesion inducing by PQ and the damage in tissue depended of temperature exposure fish. The severity of lesions clearly differed among organs with the liver showing the most extensive damages followed in order by the kidney and gills. In PQ/18°C group it was observed the changes in the pattern of lesions, with kidney showing higher damage followed gills and liver. PMID:21787721

  3. Professoras universitárias negras: trajetórias e narrativas Black female university professors: trajectories and narratives

    Directory of Open Access Journals (Sweden)

    Maria Aparecida dos Santos Crisostomo

    2010-07-01

    Full Text Available A presente investigação buscou analisar a condição de mulheres negras, docentes no ensino superior em universidades privadas da cidade de Sorocaba-SP, no período de 2000 a 2007, através de suas respectivas trajetórias e narrativas, articuladas em três aspectos: gênero, raça e escolaridade. Nosso objetivo foi verificar a inserção política e profissional da mulher negra, como docente, do Ensino Superior. A análise das narrativas de suas trajetórias e dos dados quantitativos que dispomos nos possibilita afirmar que a condição da mulher negra como professora universitária é a de exclusão. Um olhar atento sobre as trajetórias e narrativas de três mulheres negras, professoras universitárias na cidade de Sorocaba - São Paulo desvela uma história de neo-racismo brasileiro. Consideramos que no momento em que a mulher negra se fizer mais presente, como docente na universidade e em posições sociais e profissões em que antes não lhe era permitido, promoverá a construção de identidades diversificadas, com novos modos de existência e representações que poderão contribuir para a consolidação de uma sociedade plural.The present research sought to examine the condition of black women professors in higher education in private universities in the city of Sorocaba - SP, from 2000 to 2007, through their respective trajectories and narratives, focused on three aspects: gender, race, schooling. Our goal was to verify the political and professional integration of black women as Higher Education professors. The narrative analysis of their trajectories and the quantitative data allow us to affirm that the condition of black women as university professors is that of exclusion. A closer look at the trajectories and narratives of three black women, university professors in Sorocaba, reveals a history of neo-racism in Brazil. We believe that when black women become more present, as professors at universities and in social positions and

  4. Genetic variability of wild and captivity populations of Colossoma macropomum (Cuvier, 1818) - doi: 10.4025/actascibiolsci.v34i2.7149

    OpenAIRE

    Vera Maria Fonseca Almeida-Val; Maria de Nazaré Paula-Silva; Givanildo Ximenes Santana; Marco Aurélio de Brito Leitão; Carolina Fernandes Silva de Sousa; Carlos Henrique dos Anjos dos Santos

    2012-01-01

    Tambaqui (Colossoma macropomum) is among the most important fish species of the Amazon and one of the most cultivated in Brazil. In the present work we have evaluated the genetic variability of wild and captivity populations of C. macropomum. Enzymatic markers were used to estimate the genetic variability of 41 specimens from a wild group; and 30, 33 and 45 from three captivity groups, which came from Pentecostes (Ceará State), Jaboticabal (São Paulo State) and Itacoatiara (Amazonas State), r...

  5. Are rapids a barrier for floodplain fishes of the Amazon basin ? A demographic study of the keystone floodplain species Colossoma macropomum (Teleostei: Characiformes)

    OpenAIRE

    Farias, I. P.; Torrico, J. P.; Garcia-Davila, C.; Santos, M. D. F.; T. Hrbek; Renno, Jean-François

    2010-01-01

    We investigated demographic history and population structuring of Colossoma macropomum sampled from 14 localities in the Amazon basin and the Bolivian sub-basin; the two basins are separated by a series of 16 rapids. Although genetically differentiated, IMa analyses suggest non-zero bi-directional migration rates, and inter-basin divergence of approximately 17 thousand years ago. Analyses in BEAST indicated that Bolivian C. macropomum has been demographically stable except for a moderate popu...

  6. Differential Expression of Myogenic Regulatory Factor Genes in the Skeletal Muscles of Tambaqui Colossoma macropomum (Cuvier 1818) from Amazonian Black and Clear Water

    OpenAIRE

    Alves-Costa, F. A.; Barbosa, C. M.; Aguiar, R. C. M.; Mareco, E.A.; Dal-Pai-Silva, M.

    2013-01-01

    Hypothesizing that the Amazonian water system differences would affect the expression of muscle growth-related genes in juvenile tambaqui Colossoma macropomum (Cuvier 1818), this study aimed to analyze the morphometric data and expression of myogenic regulatory factors (MRFs) in the white and red muscle from tambaqui obtained from clear and black Amazonian water systems. All of the MRF transcript levels (myod, myf5, myogenin, and mrf4) were significantly lower in the red muscle from black wat...

  7. Morphometry and morphology of nucleus of the Sertoli and interstitial cells of the tambaqui Colossoma macropomum (Cuvier, 1881) (Pisces: Characidae) during the reproductive cycle

    OpenAIRE

    Nakaghi L. S. O.; Mitsuiki D.; Santos H. S. L.; Pacheco M. R.; Ganeco L. N.

    2003-01-01

    This study allowed the characterization of the tambaqui Colossoma macropomum testes structural organization, emphasizing Sertoli and interstitial cells and analyzing morphometrically the Sertoli cell nucleus diameter and the interstitial tissue area during the reproductive cycle. Fragments of tambaqui testes were collected in the following reproductive cycle stages: immature, resting, maturation I and II, mature, and regression, and were histologically processed. The Sertoli cells were found ...

  8. Effects of herbicide on the kidneys of two Venezuelan cultured fish: Caquetaia kraussii and Colossoma macropomum (Pisces:Ciclidae and Characeae)

    OpenAIRE

    M.I. Segnini de Bravo; Medina, J.; S Marcano; H.J Finol; A Boada-Sucre

    2005-01-01

    The use of chemical pesticides and herbicides has increased environmental pollution and affected ichthyofauna in the watersheds where they are used.We studied the effect of an herbicide, triazine, on the kidneys of two species (Caquetaia kraussii and Colossoma macropomum )widely found in Caribbean and South American rivers.In Venezuela,these species are abundant and have a high aquaculture potential because they may be cultured and reproduced in captivity.Four kidney samples from juveniles of...

  9. Comparison of control methods for coccidiosis in native Spanish Castellana Negra chickens

    Energy Technology Data Exchange (ETDEWEB)

    Miguel, J. A.; Asenjo, B.; Ciria, J.; Cacho, E. del; Calvo, J. L.

    2008-07-01

    Coccidiosis is a disease responsible for serious economic losses in the poultry industry. This paper compares the effect of coccidiosis infection in a population of experimentally infected Castellana Negra chickens previously administered the ionophores antibiotic monensin (Treatment 1), Alquernat Zyox, a herb-based product (Treatment 2), or a live vaccine based on oocysts selected for precocity (Treatment 3). Fifty birds per treatment were housed in captivity and weighed individually once every two weeks. At nine weeks they were infected with pathogenic oocysts of Eimeria tenella, E. acervulina and E. maxima. No significant differences (P<0.05) were seen in body weight between the birds in the three treatment groups after week 10. The average daily weight gain of the Alquernat Zycox-treated and vaccinated birds was similar over the entire experimental period, and more regular than that of the monensin-treated birds. The number of oocysts eliminated in the faeces and the degree of intestinal injury caused were analysed at 10, 11 and 12 weeks. The vaccine-treated birds shed a smaller number of oocysts in their faeces at 11 and 12 weeks than did those treated with monensin or Alquernat Zycox (P<0.001). At 11 and 12 weeks the vaccine- and Alquernat Zycox-treated birds showed significantly (P<0.05) less intestinal injury than the monensin-treated birds. (Author) 22 refs.

  10. Laguna Negra Virus Infection Causes Hantavirus Pulmonary Syndrome in Turkish Hamsters (Mesocricetus brandti).

    Science.gov (United States)

    Hardcastle, K; Scott, D; Safronetz, D; Brining, D L; Ebihara, H; Feldmann, H; LaCasse, R A

    2016-01-01

    Laguna Negra virus (LNV) is a New World hantavirus associated with severe and often fatal cardiopulmonary disease in humans, known as hantavirus pulmonary syndrome (HPS). Five hamster species were evaluated for clinical and serologic responses following inoculation with 4 hantaviruses. Of the 5 hamster species, only Turkish hamsters infected with LNV demonstrated signs consistent with HPS and a fatality rate of 43%. Clinical manifestations in infected animals that succumbed to disease included severe and rapid onset of dyspnea, weight loss, leukopenia, and reduced thrombocyte numbers as compared to uninfected controls. Histopathologic examination revealed lung lesions that resemble the hallmarks of HPS in humans, including interstitial pneumonia and pulmonary edema, as well as generalized infection of endothelial cells and macrophages in major organ tissues. Histologic lesions corresponded to the presence of viral antigen in affected tissues. To date, there have been no small animal models available to study LNV infection and pathogenesis. The Turkish hamster model of LNV infection may be important in the study of LNV-induced HPS pathogenesis and development of disease treatment and prevention strategies. PMID:25722219

  11. Natural radioactivity in environmental samples from Pontal Negra, Marica (RJ, Brazil)

    Energy Technology Data Exchange (ETDEWEB)

    Leal, Teresa Cristina dos Santos; Lima, Marco A. Frota; Kelecom, Alphonse [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Dept. de Biologia Geral. Lab. de Radiobiologia e Radiometria Pedro Lopes dos Santos - LARARA; Silva, Ademir Xavier da [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia (COPPE). Programa de Engenharia Nuclear; Patcheneelam, Sambasiva Rao [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Programa de Pos-graduacao em Geoquimica

    2007-07-01

    Determination of environmental radioactivity levels is of basic importance to estimate the radiation levels to which man is directly or indirectly exposed. The recognition of increased risks to our society has strengthened the debate and favored the communication of such risks. Thus, the health effects of low doses of ionizing radiation are being widely and controversially discussed, and represent an acute problem of public concern. In the present study, samples have been collected along the coast of Rio de Janeiro, at Ponta Negra, district of Marica, in order to determine the concentrations of natural radionuclides and to record their spectra, aiming the verification of local natural radioactivity levels. The gamma spectrometry has been used for a panoramic determination of this region. From these results, calculations of annual dose of radiation (ADR) for each sample can be carried out, allowing to estimate the dose contribution to which individuals of the public (e.g. residents) are submitted, and to predict eventual health damage. These results must be compared with the limits established by the Brazilian National Commission of Nuclear Energy (CNEN). (author)

  12. Anestesia na população negra Anestesia en la población negra Anesthesia in the afro-american population

    Directory of Open Access Journals (Sweden)

    Nilton Bezerra do Vale

    2003-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Percentual significativo dos 12 milhões de negros americanos pode apresentar modificações fisiológicas, fisiopatológicas e farmacológicas capazes de modificar o bom desenvolvimento do ato anestésico; a população brasileira que se considera afro-descendente (40% pode também apresentá-las por causa da mesma origem étnica e geográfica. O objetivo desta revisão é reavaliar o viés da diferença racial em eventuais mudanças no efeito das drogas anestésicas e adjuvantes no ato anestésico. CONTEÚDO: A análise dos estudos fisiopatológicos inerentes à histórica migração do gene africano em relação aos caucasianos mostra significativas diferenças raciais entre o negro americano ou africano, sugerindo uma estreita interface entre a genética e o ambiente, capaz de modificar o procedimento anestésico. As condições sócio-econômicas desfavoráveis da população negra das Américas como resultado de 400 anos de história de escravidão continuam sempre a influenciar na preservação de diferenças culturais e fisiológicas, além da cor da pele: disfunções de sistemas orgânicos estão relacionados com o SNC, SCV, respiratório e renal. No entanto, modificações de efeito de drogas anestésicas e seus adjuvantes, como diminuição do efeito analgésico local do creme anestésico EMLA, aumento do efeito hipnótico do propofol e da toxicidade do paracetamol, menor efeito anti-hipertensivo das drogas que reduzem renina (IECA, bloqueadores beta2 e de AT1, menor ação dos vasodilatadores beta2 e menor fibrinólise do t-PA podem afetar a conduta pré e pós-anestésica, sobretudo em pacientes negros hipertensos, renais, asmáticos ou com acidente vascular cerebral. CONCLUSÕES: Resposta a drogas pode variar entre diferentes populações devido a fatores biológicos (idade, sexo, doença, genéticos, culturais e ambientais. O fator demográfico raça deve ser valorizado na visita ou consulta pr

  13. Qualidade pós-colheita da alface hidropônica em ambiente protegido sob malhas termorefletoras e negra

    Directory of Open Access Journals (Sweden)

    Patrícia Lígia Dantas de Morais

    2011-10-01

    Full Text Available Considerando que a duração da exposição, a qualidade e intensidade de luz afetam as características de qualidade das hortaliças folhosas, conduziu-se um experimento, em ambiente protegido, com o objetivo de avaliar a qualidade pós-colheita da alface hidropônica, sob os efeitos das malhas de sombreamento, com diferentes percentagens de atenuação da radiação solar. O delineamento experimental foi o de blocos casualizados, no esquema fatorial 2 x 5, com três repetições, sendo os tratamentos constituídos por quatro malhas termorefletoras (40; 50; 60 e 70% de sombreamento e uma testemunha, com malha negra 50%. Em cada parcela, representada por um sistema hidropônico individual, foi cultivada a alface (cv. Olinda, Crespa, sendo avaliada sua qualidade por ocasião da colheita e após quatro dias de armazenamento refrigerado (7,6 ± 1ºC e 27 ± 5 % UR. Observou-se que o excesso de sombreamento, ocasionado pelas malhas termorefletoras 60 e 70% e malha negra 50%, comprometeram a aparência da alface. As plantas submetidas ao sombreamento com a malha termorefletora 40% apresentaram menor perda de massa, ao final de quatro dias de armazenamento. Os graus de sombreamento ocasionados pelas malhas termorefletoras e pela malha negra não influenciaram nos teores de ácido cítrico, sólidos solúveis, vitamina C e clorofila total da alface.

  14. Consciência negra, justiça ambiental e sustentabilidade

    Directory of Open Access Journals (Sweden)

    Valdir Lamin-Guedes

    2013-01-01

    Full Text Available One of the goals of working with Black consciousness is showing how Brazil is marked by racial differentiation and discrimination, once the issue of racism has been almost permanently denied, both inside and outside country. We are all invited to think about the inclusion of Blacks in the Brazilian society, as well as about the environmental injustice they are subject to. As a population less endowed with financial, political and/or informational resources, Black people experience a disproportionate imposition to environmental risks. The quest for a sustainable development that includes an economic, social and ecological balance involves the search for greater environmental justice.Um dos objetivos de se trabalhar com a consciência negra é mostrar o quanto o Brasil está marcado por diferenças e discriminações raciais, já que o tema do racismo quase sempre foi negado, dentro e fora do país. Neste sentido, somos todos convidados a refletir sobre a inserção do negro na sociedade brasileira, inclusive na compreensão de que os negros sofrem com a injustiça ambiental, ou seja, que estes toleram uma imposição desproporcional dos riscos ambientais, por serem populações menos dotadas de recursos financeiros, políticos e/ou de informação. A busca por um desenvolvimento sustentável e equilibrado entre os aspectos econômicos, sociais e ecológicos passa pela busca de uma maior justiça ambiental.

  15. Sobre nidos aéreos de rata negra, Rattus rattus (Linnaeus, 1758), en el naranjal saguntino (Valencia)

    OpenAIRE

    Faus Percha, Félix Vicente; Vericad Coromina, Juan Ramón

    1981-01-01

    El estudio de diversos aspectos ecológicos sobre la nidificación aérea de rata negra, R. rattus, en una parcela de naranjales del municipio de Sagunto (Valencia, España) muestra una tendencia de la especie a nidificar en este tipo de cultivo. Los nidos aéreos, de forma generalmente esférica, han presentado una composición cualitativa uniforme a base de ramilletes con hojas y hojas sueltas procedentes de los mismos naranjos; su utilización como lugar de parto y cría así co...

  16. Crenças em saúde sobre a dieta: uma perspectiva de pessoas negras hipertensas

    OpenAIRE

    Cláudia Geovana da Silva Pires; Fernanda Carneiro Mussi

    2012-01-01

    Pesquisa descritiva-exploratória, objetivou identificar as crenças em saúde, de pessoas negras com hipertensão arterial, sobre as barreiras e benefícios relacionados à dieta para o controle da doença, conhecendo os fatores sociodemográficos associados às crenças em saúde quanto aos benefícios para o controle da dieta. Cento e seis adultos, negros e hipertensos foram entrevistados utilizando-se instrumento específico. Os dados foram analisados em percentuais, frequência de casos, escores e raz...

  17. DETECÇÃO DE FUNGOS PATOGÊNICOS EM SEMENTES DE ACÁCIA-NEGRA (Acacia mearnsii De Wild)

    OpenAIRE

    Flávia Elise Meneghini dos Santos; Rita de Cassia Sobrosa; Ivan Francisco D. Costa; Maisa Pimentel Martins Corder

    2000-01-01

    A presença de fungos pode reduzir a capacidade germinativa de um lote de sementes, causar a morte de plântulas ou transmitir doenças para plantas adultas. É necessário conhecer os agentes, as causas e as conseqüências decorrentes da contaminação por fungos patogênicos. Desse modo, o presente estudo teve como objetivo identificar os fungos associados às sementes de Acacia mearnsii De Wild, armazenadas a 5°C, por um período de 12 meses. Foram utilizadas sementes de acácia-negra oriundas de plan...

  18. PLAN DE EMPRESA PARA UN NEGOCIO DE NUEVA CREACIÓN DEDICADO AL CULTIVO Y VENTA DE TRUFA NEGRA.

    OpenAIRE

    BOIX PELLICER, XAVIER

    2012-01-01

    La idea del Proyecto Final de Carrera que se va a realizar es un plan de empresa que consta de una línea de negocio dedicada a la producción y posterior comercialización de la trufa negra (tuber melanosporum), desde la adquisición y adaptación del terreno para que el cultivo de la trufa sea óptimo, hasta la distribución del producto a los correspondientes clientes. Uno de los principales motivos que me ha llevado a realizar este plan de empresa, fue la adquisición por parte de mis pa...

  19. Valsa negra, de Patrícia Melo: gênero e representação = Patrícia Melo’s Valsa negra: gender and representation

    Directory of Open Access Journals (Sweden)

    Lúcia Osana Zolin

    2007-07-01

    Full Text Available Este artigo consiste em uma leitura do romance Valsa negra, da escritora brasileira contemporânea Patrícia Melo, cuja preocupação primeira é averiguar o modo como são representadas as relações de gênero. Bem diferente da tradição literária de autoria feminina, o texto é narrado em primeira pessoa pelo próprio protagonista, um maestro cinqüentão e bem-sucedido, casado com uma violinista judia, trinta anos mais jovem. As perturbações afetivas advindas do ciúme doentio que a esposa desperta nele consistem nas molas propulsoras das ações representadas e por nós analisadas. O suporte teórico de nossas considerações é doado-nos pelo feminismo crítico.This work is a study on gender relationships as represented in Valsa negra (Black waltz, a novel by Brazilian contemporary writer Patrícia Melo. Differently from female author tradition, the text has an autodiegetic narrator. The protagonist is a successful fiftyish conductor, married to a Jewish violinist thirty years his junior. The action in the novel consists of the affective problems caused by the pathological jealousy he feels for his wife, which will be analyzed in this work. The theoretical approach used is Feminist Criticism.

  20. Fauna parasitária de tambaqui Colossoma macropomum (Characidae) cultivado em tanque-rede no estado do Amapá, Amazônia oriental Parasitic fauna of tambaqui Colossoma macropomum(Characidae) farmed in cages in the State of Amapá, eastern Amazon

    OpenAIRE

    Evandro Freitas Santos; Marcos Tavares-Dias; Douglas Anadias Pinheiro; Ligia Rigôr Neves; Renata das Graças Barbosa Marinho; Márcia Kelly Reis Dias

    2013-01-01

    O objetivo principal deste trabalho foi estudar a parasitofauna e a relação hospedeiro- parasito em tambaqui Colossoma macropomum cultivados em tanques-rede no Rio Matapi, município de Santana, estado do Amapá, região da Amazônia oriental, Brasil. Foram examinados 60 tambaquis, dos quais 96,7% estavam parasitados por protozoários Ichthyophthirius multifiliis (Ciliophora) e Piscinoodinium pillulare (Dinoflagellida), monogenoideas Mymarotheciun boegeri e Anacanthorus spathulatus (Dactylogyridae...

  1. Morphometry and morphology of nucleus of the Sertoli and interstitial cells of the tambaqui Colossoma macropomum (Cuvier, 1881) (Pisces: Characidae) during the reproductive cycle Morfometria e morfologia do núcleo das células de Sertoli e intersticiais do tambaqui Colossoma macropomum (Cuvier, 1881) (Pisces: Characidae), durante o ciclo reprodutivo

    OpenAIRE

    L.S.O. Nakaghi; D. Mitsuiki; H. S. L. Santos; M.R. Pacheco; L. N. Ganeco

    2003-01-01

    This study allowed the characterization of the tambaqui Colossoma macropomum testes structural organization, emphasizing Sertoli and interstitial cells and analyzing morphometrically the Sertoli cell nucleus diameter and the interstitial tissue area during the reproductive cycle. Fragments of tambaqui testes were collected in the following reproductive cycle stages: immature, resting, maturation I and II, mature, and regression, and were histologically processed. The Sertoli cells were found ...

  2. Nutritional characteristics of amazonian fish fat (Colossoma macropomum) and its effect on lipid metabolism of rats fed hypercholesterolemic diets Características nutricionais do tambaqui (Colossoma Macropomum) e seu efeito no metabolismo lipídico de ratos alimentados com dietas ricas em colesterol

    OpenAIRE

    Raimundo Vicente de Sousa; Paulo César Ferreira Santos; Eduardo Alues Bambirra; Enio Cardillo Vieira; Jacqueline Isaura Alvarez-Leite

    2002-01-01

    The effects of fat from tambaqui (Colossoma macropomum), an Amazonian fish, on some nutritional and lipid parameters in rats were evaluated. Weaned Wistar rats were fed for 6 weeks with hypercholesterolemic diets containing 7.5% of soybean oil (SO), cod liver oil (CO), lard (LA), or tambaqui fat (TF). Food consumption, weight gain, and food conversion were measured weekly. Plasma triglycerides was determined at the beginning and on the 6th week of experiment. Plasma cholesterol was determined...

  3. Crenças em saúde sobre a dieta: uma perspectiva de pessoas negras hipertensas

    Directory of Open Access Journals (Sweden)

    Cláudia Geovana da Silva Pires

    2012-06-01

    Full Text Available Pesquisa descritiva-exploratória, objetivou identificar as crenças em saúde, de pessoas negras com hipertensão arterial, sobre as barreiras e benefícios relacionados à dieta para o controle da doença, conhecendo os fatores sociodemográficos associados às crenças em saúde quanto aos benefícios para o controle da dieta. Cento e seis adultos, negros e hipertensos foram entrevistados utilizando-se instrumento específico. Os dados foram analisados em percentuais, frequência de casos, escores e razão de prevalência. A análise global sobre as crenças mostrou predomínio da categoria e benefícios para o controle da dieta. Foi observada tendência entre homens, pessoas mais jovens, sem companheiro e com baixas escolaridade e renda à menor crença quanto aos os benefícios atinentes à adoção da dieta. Concluiu-se que a promoção da saúde da população negra exige abordagem interdisciplinar e política de saúde, contemplando as suas especificidades e necessidades e dirigidas a aspectos preventivos e curativos.

  4. Radiometric discrimination of pre-Variscan amphibolites in the Ediacaran Serie Negra (Ossa-Morena Zone, SW Iberia)

    Science.gov (United States)

    Sánchez-Lorda, M. E.; Ábalos, B.; García de Madinabeitia, S.; Eguíluz, L.; Gil Ibarguchi, J. I.; Paquette, J.-L.

    2016-06-01

    New results on the geochronology of metabasites hosted by the Neoproterozoic (late Ediacaran) Serie Negra of the Ossa-Morena Zone (Iberian Massif) are presented. These rocks record a protracted subduction at least since the latest Cryogenian, followed in a continuum by early Cambrian rifting. The Serie Negra country rocks are continental-crust forearc segments of the thinned continental margin of Gondwana. The metabasite suite exhibits E- and N-MORB, as well as volcanic arc signatures, and discloses the existence of a diverse Late Ediacaran-Early Cambrian magmatism across the Ossa-Morena Zone. Protoliths of the E-MORB metabasites are clearly Ediacaran. They exhibit geochemical characteristics typical of younger island arcs, notably of their forearc zones affected by extension soon after the initiation of subduction. Radiometric dating of N-MORB metabasites shows that these rocks are significatively younger than their country rocks, whose age has been stratigraphically and paleontologically constrained as Ediacaran. They record early Cambrian rifting developed in a continuum after a protracted subduction. Metabasite petrological zonation permits to reconstruct a single Ediacaran subduction zone located to the S of the current OMZ and dipping towards the N (in present day geographical coordinates).

  5. Doença de Tay-Sachs em criança de raça negra

    Directory of Open Access Journals (Sweden)

    Sérgio Rosemberg

    1970-12-01

    Full Text Available É relatado um caso de doença de Tay-Sachs em criança da raça negra. O encontro desta entidade em indivíduos não judeus é bastante raro, sendo este o quinto caso descrito em criança negra. Os autores estudam alguns aspectos genéticos, chegando à conclusão de que o cálculo da freqüência do gene mutante é impossível devido ao pequeno número de casos e ao fato de que não há estimativas seguras quanto à taxa de nascimento de indivíduos negros na população, Em que pese o fato de o diagnóstico se assentar em bases puramente clínicas e anatômicas, prescindindo os autores de exames bioquímicos específicos, os dados apresentados são congruentes com os casos clássicos descritos na literatura.

  6. The 2005 eruption of Sierra Negra volcano, Galápagos, Ecuador

    Science.gov (United States)

    Geist, Dennis J.; Harpp, Karen S.; Naumann, Terry R.; Poland, Michael P.; Chadwick, William W.; Hall, Minard; Rader, Erika

    2008-01-01

    Sierra Negra volcano began erupting on 22 October 2005, after a repose of 26 years. A plume of ash and steam more than 13 km high accompanied the initial phase of the eruption and was quickly followed by a ~2-km-long curtain of lava fountains. The eruptive fissure opened inside the north rim of the caldera, on the opposite side of the caldera from an active fault system that experienced an mb 4.6 earthquake and ~84 cm of uplift on 16 April 2005. The main products of the eruption were an `a`a flow that ponded in the caldera and clastigenic lavas that flowed down the north flank. The `a`a flow grew in an unusual way. Once it had established most of its aerial extent, the interior of the flow was fed via a perched lava pond, causing inflation of the `a`a. This pressurized fluid interior then fed pahoehoe breakouts along the margins of the flow, many of which were subsequently overridden by `a`a, as the crust slowly spread from the center of the pond and tumbled over the pahoehoe. The curtain of lava fountains coalesced with time, and by day 4, only one vent was erupting. The effusion rate slowed from day 7 until the eruption’s end two days later on 30 October. Although the caldera floor had inflated by ~5 m since 1992, and the rate of inflation had accelerated since 2003, there was no transient deformation in the hours or days before the eruption. During the 8 days of the eruption, GPS and InSAR data show that the caldera floor deflated ~5 m, and the volcano contracted horizontally ~6 m. The total eruptive volume is estimated as being ~150×106m3. The opening-phase tephra is more evolved than the eruptive products that followed. The compositional variation of tephra and lava sampled over the course of the eruption is attributed to eruption from a zoned sill that lies 2.1 km beneath the caldera floor.

  7. Micronucleus frequency and hematologic index in Colossoma macropomum (Pisces, Ariidae) for environmental impact assessment at a protected area in Brazil

    International Nuclear Information System (INIS)

    This study used micronucleus assays and erythrocyte indices in the freshwater fish tambaqui, Colossoma macropomum, to assess environmental impacts in the Environmental Protection Area at Maracanã, São Luis, Brazil. Fish were sampled from two locations within the protected area, Serena Lagoon and Ambude River, on four occasions. Biometric data (length and weight) and an aliquot of blood were collected from each fish for analysis. Erythrocyte indices including: mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were calculated, and blood samples were examined for micronuclei and nuclear morphological changes. Micronuclei were found in fish from both locations, although the frequency was higher in fish from Ambude River. Nuclear morphological changes were identified only in fish collected from Ambude River. Several nuclear morphological changes were found in erythrocytes stained with Giemsa, including: micronuclei and binucleate nuclei. On average, erythrocyte indices were lower in fish collected from Ambude River than in those from Serena Lagoon. Our results indicate that micronuclei and erythrocyte indices can be used in C. macropomum as indicators of environmental health

  8. Cardiorespiratory reflexes and aquatic surface respiration in the neotropical fish tambaqui (Colossoma macropomum): acute responses to hypercarbia.

    Science.gov (United States)

    Florindo, Luiz H; Reid, Stephen G; Kalinin, Ana L; Milsom, William K; Rantin, Francisco T

    2004-05-01

    We examined the cardiorespiratory responses to 6 h of acute hypercarbia (1, 2.5, and 5% CO(2)) in intact and gill-denervated (bilateral denervation of branchial branches of cranial nerves IX and X) tambaqui, Colossoma macropomum. Intact fish exposed to 1 and 2.5% CO(2) increased respiratory frequency ( f(R)) and ventilation amplitude ( V(AMP)) slowly over a 1- to 3-h period. Denervated fish did not show this response, suggesting that tambaqui possess receptors in the gills that will produce excitatory responses to low levels of hypercarbia (1 and 2.5% CO(2)) if the exposure is prolonged. The cardiac response to stimulation of these receptors with this level of CO(2) was a tachycardia and not a bradycardia. During exposure to 5% CO(2), intact fish increased f(R) and V(AMP), and showed a pronounced bradycardia after 1 h. After 2 h, the heart rate ( f(H)) started to increase, but returned to control values after 6 h. In denervated fish, the increase in f(R) was abolished. The slow increase in V(AMP) and the bradycardia were not abolished, suggesting that these changes arose from extra-branchial receptors. Neither intact nor denervated fish developed the swelling of the lower lip or performed aquatic surface respiration, even after 6 h, suggesting that these are unique responses to hypoxia and not hypercarbia. PMID:14986045

  9. Micronucleus frequency and hematologic index in Colossoma macropomum (Pisces, Ariidae) for environmental impact assessment at a protected area in Brazil

    Science.gov (United States)

    Sousa, Debora Batista Pinheiro; Neta, Raimunda Nonata Fortes Carvalho

    2014-10-01

    This study used micronucleus assays and erythrocyte indices in the freshwater fish tambaqui, Colossoma macropomum, to assess environmental impacts in the Environmental Protection Area at Maracanã, São Luis, Brazil. Fish were sampled from two locations within the protected area, Serena Lagoon and Ambude River, on four occasions. Biometric data (length and weight) and an aliquot of blood were collected from each fish for analysis. Erythrocyte indices including: mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were calculated, and blood samples were examined for micronuclei and nuclear morphological changes. Micronuclei were found in fish from both locations, although the frequency was higher in fish from Ambude River. Nuclear morphological changes were identified only in fish collected from Ambude River. Several nuclear morphological changes were found in erythrocytes stained with Giemsa, including: micronuclei and binucleate nuclei. On average, erythrocyte indices were lower in fish collected from Ambude River than in those from Serena Lagoon. Our results indicate that micronuclei and erythrocyte indices can be used in C. macropomum as indicators of environmental health.

  10. Humic substances and crude oil induce cytochrome P450 1A expression in the Amazonian fish species Colossoma macropomum (Tambaqui).

    Science.gov (United States)

    Matsuo, Aline Y O; Woodin, Bruce R; Reddy, Christopher M; Val, Adalberto L; Stegeman, John J

    2006-04-15

    Cytochrome P450 1A (CYP1A) induction is used widely as a biomarker of exposure to pollutants, such as petroleum hydrocarbons, yet CYP1A inducibility has been characterized in few tropical fish. Using Western blot analysis, catalytic assay, and immunohistochemistry, we evaluated CYP1A induction in an Amazonian fish (tambaqui; Colossoma macropomum) acclimated to humic substances (HS) and acutely exposed to crude oil. HS are ubiquitous in Amazonian waters, and they are known to affect the bioavailability of pollutants. CYP1A activity was also measured in fish exposed for 10 days to a range of concentrations of HS from both natural and commercial sources. Crude oil induced CYP1A expression in tambaqui, as expected. Exposure to both HS and crude oil resulted in greater levels of CYP1A expression relative to that in fish exposed to petroleum alone. Interestingly, CYP1A induction was also observed in fish exposed to HS alone. Induction by HS was concentration-dependent, and activity was higher in fish exposed to HS from the commercial source than in fish exposed to the HS from the natural source. The use of CYP1A as a biomarker of exposure to pollutants such as petroleum hydrocarbons in fish living in environments rich in humic substances should be considered with caution given that HS themselves induce CYP1A expression. Our results suggest that there may be as yet unknown CYP1A inducing components (aryl hydrocarbon receptor agonists) in humic substances. PMID:16683634

  11. Perulernaea gamitanae (Copepoda: Lernaeidae parasitizing tambaqui (Colossoma macropomum (Characidae and the hybrids tambacu and tambatinga, cultured in northern Brazil

    Directory of Open Access Journals (Sweden)

    M. Tavares-Dias

    2011-08-01

    Full Text Available The infestation rate in Colossoma macropomum, hybrid tambacu (C. macropomum x Piaractus mesopotamicus and hybrid tambatinga (C. macropomum x Piaractus brachypomum with Perulernaea gamitanae Thatcher and Paredes, 1985 from two fish farms in Amapá State, Brazil was studied. Lernaeid parasites (n=2887 were collected mainly on the tongue and the mouth cavity and also on cartilage of gill arches and filaments. Inflammation and fibrous nodules were observed on the attachment sites of the parasites. The infestation rate varied according to the fish farm and host. The prevalence of P. gamitanae was of 100% in hosts from one fish farm and was lower in the other fish farm. Higher intensity of P. gamitanae occurred in hybrids tambacu and tambatinga, but despite the high prevalence its intensity was moderate. This is the first report on epidemiology of P. gamitanae in cultured fishes from Brazilian Amazonia, and the occurrence of this crustacean parasite in two new hosts, the hybrids tambacu and tambatinga.

  12. Modelling the growth of tambaqui, Colossoma macropomum (Cuvier, 1816) in floodplain lakes: model selection and multimodel inference.

    Science.gov (United States)

    Costa, L R F; Barthem, R B; Albernaz, A L; Bittencourt, M M; Villacorta-Corrêa, M A

    2013-05-01

    The tambaqui, Colossoma macropomum, is one of the most commercially valuable Amazonian fish species, and in the floodplains of the region, they are caught in both rivers and lakes. Most growth studies on this species to date have adjusted only one growth model, the von Bertalanffy, without considering its possible uncertainties. In this study, four different models (von Bertalanffy, Logistic, Gompertz and the general model of Schnüte-Richards) were adjusted to a data set of fish caught within lakes from the middle Solimões River. These models were adjusted by non-linear equations, using the sample size of each age class as its weight. The adjustment evaluation of each model was based on the Akaike Information Criterion (AIC), the variation of AIC between the models (Δi) and the evidence weights (wi). Both the Logistic (Δi = 0.0) and Gompertz (Δi = 1.12) models were supported by the data, but neither of them was clearly superior (wi, respectively 52.44 and 29.95%). Thus, we propose the use of an averaged-model to estimate the asymptotic length (L∞). The averaged-model, based on Logistic and Gompertz models, resulted in an estimate of L∞=90.36, indicating that the tambaqui would take approximately 25 years to reach average size. PMID:23917568

  13. Genetic variation in native and farmed populations of Tambaqui (Colossoma macropomum) in the Brazilian Amazon: regional discrepancies in farming systems.

    Science.gov (United States)

    Aguiar, Jonas; Schneider, Horacio; Gomes, Fátima; Carneiro, Jeferson; Santos, Simôni; Rodrigues, Luis R; Sampaio, Iracilda

    2013-01-01

    The tambaqui, Colossoma macropomum, is the most popular fish species used for aquaculture in Brazil but there is no study comparing genetic variation among native and farmed populations of this species. In the present study, we analyzed DNA sequences of the mitochondrial DNA to evaluate the genetic diversity among two wild populations, a fry-producing breeding stock, and a sample of fish farm stocks, all from the region of Santarém, in the west of the Brazilian state of Pará. Similar levels of genetic diversity were found in all the samples and surprisingly the breeding stock showed expressive representation of the genetic diversity registered on wild populations. These results contrast considerably with those of the previous study of farmed stocks in the states of Amapá, Pará, Piauí, and Rondônia, which recorded only two haplotypes, indicating a long history of endogamy in the breeding stocks used to produce fry. The results of the two studies show two distinct scenarios of tambaqui farming in the Amazon basin, which must be better evaluated in order to guarantee the successful expansion of this activity in the region, and the rest of Brazil, given that the tambaqui and its hybrids are now farmed throughout the country. PMID:24141412

  14. Physicochemical analysis of the oil of tambaqui fillet (Colossoma macropomum cultivated in the state of Roraima, Brazil

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    Antonio Alves de Melho Filho

    2013-01-01

    Full Text Available The objective this work was to realize chemometrics analysis and to determine the physicochemical characteristics of tambaqui fish oil (Colossoma macropomum, grown in four localities in the state of Roraima, Alto Alegre (A, Bonfim (B, Uraricoera (U and Passarão (P. Obtaining oil tambaqui was through his ground meat, dried in oven air circulation following agitation for one hour. Some physicochemical characteristics were analyzed: acidity index (AI, in oleic acid acidity (OAA, of iodine (II, peroxide (PI, saponification (SI, and refractive index (RI, humidity contents and ashes, melting point, density, viscosity, totals lipids and organics substances soluble in ether. For chemometrics analysis was applied to the multivariate analysis, PCA and HCA. The samples different of the localities were discriminated geographically. The samples U1, U2 and U3 showed highest values for II and RI, B1, B2 and B3 showed the highest values for AI, OAA, SI and PI, P1, P2 and P3 showed lowest values for AI, RI, SI, OAA and PI, the samples A1, A2 and A3 had the highest humidity content, density and viscosity.

  15. Micronucleus frequency and hematologic index in Colossoma macropomum (Pisces, Ariidae) for environmental impact assessment at a protected area in Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, Debora Batista Pinheiro, E-mail: deborabpsousa@gmail.com [Postgraduate Program of Aquatic Resources and Fishery (PPGRAP/UEMA), State University of Maranhão (Brazil); Neta, Raimunda Nonata Fortes Carvalho [Department of Chemistry and Biology, State University of Maranhão (Brazil)

    2014-10-06

    This study used micronucleus assays and erythrocyte indices in the freshwater fish tambaqui, Colossoma macropomum, to assess environmental impacts in the Environmental Protection Area at Maracanã, São Luis, Brazil. Fish were sampled from two locations within the protected area, Serena Lagoon and Ambude River, on four occasions. Biometric data (length and weight) and an aliquot of blood were collected from each fish for analysis. Erythrocyte indices including: mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were calculated, and blood samples were examined for micronuclei and nuclear morphological changes. Micronuclei were found in fish from both locations, although the frequency was higher in fish from Ambude River. Nuclear morphological changes were identified only in fish collected from Ambude River. Several nuclear morphological changes were found in erythrocytes stained with Giemsa, including: micronuclei and binucleate nuclei. On average, erythrocyte indices were lower in fish collected from Ambude River than in those from Serena Lagoon. Our results indicate that micronuclei and erythrocyte indices can be used in C. macropomum as indicators of environmental health.

  16. INFLUÊNCIA DO FOTOPERÍODO EMERAL SOBRE CARCTERISTICAS BROMATOLÓGICAS DA CARCAÇA DE JUVENIS DE TAMBAQUI (Colossoma macropomum)

    OpenAIRE

    PEDRO PIERRO MENDONÇA; MONIQUE VIRÃES BARBOSA DOS SANTOS; MANUEL VAZQUEZ VIDAL JUNIOR; DALCIO RICARDO DE ANDRADE

    2011-01-01

    The aim of this study was to evaluate the influence of ahemeral photoperiod on the chemical composition of the carcasses of tambaqui (Colossoma macropomum). The experiment was conducted using 1 90 fish with average weight of 11.01 ± 2.08g and total lenght of 7.8± 0.18cm,stored in sixteen bowls of 56 liters of water with daily renewal of 40-times volume. The water temperarature was maintained at 29.1 ± 0.41°C and the stocking rate was equivalent to 2.75g/L. All tanks had constant aeration. Ahe...

  17. Morphometry and morphology of nucleus of the Sertoli and interstitial cells of the tambaqui Colossoma macropomum (Cuvier, 1881) (Pisces: Characidae) during the reproductive cycle.

    Science.gov (United States)

    Nakaghi, L S O; Mitsuiki, D; Santos, H S L; Pacheco, M R; Ganeco, L N

    2003-02-01

    This study allowed the characterization of the tambaqui Colossoma macropomum testes structural organization, emphasizing Sertoli and interstitial cells and analyzing morphometrically the Sertoli cell nucleus diameter and the interstitial tissue area during the reproductive cycle. Fragments of tambaqui testes were collected in the following reproductive cycle stages: immature, resting, maturation I and II, mature, and regression, and were histologically processed. The Sertoli cells were found at the periphery of the cysts of germinative lineage cells and the nuclei were shown to be smaller as these cells developed. The interstitial cells were better observed between the seminiferous lobules next to vessels in the interstitial tissue of maturing testes. PMID:12914420

  18. Evaluación de una solución inmovilizadora para criopreservación del semen de Colossoma macropomum, “Gamitana”

    OpenAIRE

    Ehrlich Llasaca-Calizaya; Lorgio Verdi-Olivares; Jesús Nuñez-Rodriguez

    2015-01-01

    El objetivo del trabajo fue la criopreservacion de semen, que permitirá constituir un banco genético, para lo cual se buscó obtener una solución  inactivadora de colecta para el semen de Colossoma macropomum  “gamitana”, que permita obtener espermatozoides, con buena motilidad de activación después de la descongelación, en nitrógeno líquido. Se utilizó semen de reproductores mantenidos, del Instituto de Investigaciones de la Amazonía Peruana (IIAP) inducidos con Conceptal® y sin inducir mante...

  19. Variación mensual del índice gonadosomatico de Colossoma macropomum relacionado a factores ambientales en Cañas, Costa Rica.

    OpenAIRE

    Jorge Boza

    2016-01-01

    Con el fin de determinar la variación mensual en el índice gonadosomático de Colossoma macropomum en estanques, se tomaron muestras mensuales de 10 individuos desde setiembre de 1993 hasta setiembre de 1994. Se midieron además, durante todo el período experimental los siguientes parámetros ambientales: precipitación, temperatura del agua y oxígeno disuelto. El índice gonadosomático (IGS) en las hembras presentó un rápido incremento de abril a mayo, permaneciendo alto de junio hasta ag...

  20. Jenis dan Tingkat Serangan Cacing Parasitik Berdasarkan Perbedaan Tingkatan Umur Pada Insang dan Saluran Pencernaan (Usus) Ikan Bawal Air Tawar (Colossoma macropomum) Pada Kolam Budidaya Di Tanjung Morawa

    OpenAIRE

    Silalahi, Berlina Okvita N

    2016-01-01

    The research on the type and degree of parasitic worm attacks based on different age levels in the gills and digestive tract (gut) of freshwater pomfret (Colossoma macropomum) in pond aquaculture in Tanjung Morawa was conducted in March-April 2015 in order to determine the type and level parasitic worm attacks on the gills and digestive tract (gut) in C. macropomum. The method used is a survey method and the method of mouth gills. Samples were taken at random in each pool based on the differe...

  1. Coeficientes de digestibilidad aparente de harina de pescado peruana y maíz amarillo duro para Colossoma macropomum (Actinopterygii, Characidae)

    OpenAIRE

    Felix Walter Gutierrez; Javier Zaldívar; Guadalupe Contreras

    2008-01-01

    Los Coeficientes de Digestibilidad Aparente (CDA) de la materia seca (MS), proteína cruda (PC), lípido crudo(LC) y energía bruta (EB) de los ingredientes alimenticios harina de pescado peruana (HPP) y de maíz amarillo duro (MAD) fueron determinados en juveniles de Colossoma macropomum (150,0 ± 25,5 g). En el experimento la dieta de referencia se mezcló con cada uno de los ingredientes prueba en una relación de 70:30. El óxido crómico se usó como indicador inerte. La dieta de referencia y las ...

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

    OpenAIRE

    Lorgio Verdi-Olivares; Fernando Alcántara-Bocanegra; Luciano Rodríguez-Chu; Fred Chu-Koo; Pedro Ramírez-Arrarte; Salvador Tello-Martín

    2014-01-01

    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 renta...

  3. Utilización de la proteína dietaría por alevinos de la gamitana, Colossoma macropomum, alimentados con dietas isocalóricas

    OpenAIRE

    Félix Walter Gutiérrez; Máximo Quispe; Luz Valenzuela; Guadalupe Contreras; Javier Zaldívar

    2011-01-01

    Un experimento fue conducido para evaluar los efectos de cinco niveles de proteína (25,27, 29, 31 y 33%) sobre el comportamiento productivo de alevinos de la gamitana, Colossoma macropomum Cuvier 1818, alimentados con dietas isocalóricas (2,7 kcal de ED/g). Los parámetros medidos fueron ganancia de peso (GP), conversión alimenticia (CA), proteína retenida (PR), razón de eficiencia proteica (REP) y energía retenida (ER). En la preparación de las dietas experimentales se utilizaron como fuentes...

  4. Recent (0-8 Ma) tectonics and exhumation processes in Cordilleras Blanca and Negra, Central Peru: Constraints from (U-Th)/He dating

    Science.gov (United States)

    Margirier, Audrey; Robert, Xavier; Gautheron, Cécile; Audin, Laurence

    2014-05-01

    The Central Andes are a classical example of topography building in front of an oceanic subduction. However, many first order questions are still debated: How do subduction processes and observed tectonic uplift interact along the Andean margin? What is the impact of tectonic, magmatism and climate on exhumation? The Cordilleras Blanca (6768 m) and Negra (5181 m), in north Central Peru, belong to the highest Andean reliefs. Both ranges trend parallel to the subduction zone and are separated by the NW-SE Rio Santa valley. The Cordillera Blanca pluton formed in an active subduction context at 8-5 Ma and renders an abnormal magmatic activity over a planar subduction. In contrast with the Cordillera Blanca, the Cordillera Negra is an older relief, which evolution and exhumation history has never been studied. A remarkable ~200 km-long normal fault system showing ~4500 m of vertical displacement since 5 Ma edges the western flank of the Cordillera Blanca. This region is a perfect target to study the impact of magmatism and subduction processes on exhumation. We perform a morphotectonic study on both cordilleras coupled with low-temperature thermochronology apatite (U-Th)/He dating to quantify these processes. Geomorphic parameters and altitude contrasts between these two ranges indicate a differential uplift. The Cordillera Negra displays a smooth and asymmetric relief from the West to the East whereas the Cordillera Blanca shows higher and sharper relief with North/South and East/West contrasts. We obtain apatite (U-Th)/He ages for twenty samples located along vertical and horizontal profiles at different latitudes of the Cordilleras Blanca and Negra. The (U-Th)/He ages range from 13.4 ± 1.3 to 5.6 ± 0.6 Ma in the Cordillera Negra and range from 11.8 ± 1.2 to 2.0 ± 0.2 Ma in the Cordillera Blanca. We use them as inputs in QTQt tools for time-temperature reconstructions and thus to constrain the exhumation history. Whole ages evidence a more regional exhumation than

  5. Imaging spatial and temporal seismic source variations at Sierra Negra Volcano, Galapagos Islands using back-projection methods

    Science.gov (United States)

    Kelly, C. L.; Lawrence, J. F.; Ebinger, C. J.

    2013-12-01

    Imaging spatial and temporal seismic source variations at Sierra Negra Volcano, Galapagos Islands using back-projection methods Cyndi Kelly1, Jesse F. Lawrence1, Cindy Ebinger2 1Stanford University, Department of Geophysics, 397 Panama Mall, Stanford, CA 94305, USA 2University of Rochester, Department of Earth and Environmental Science, 227 Hutchison Hall, Rochester, NY 14627, USA Low-magnitude seismic signals generated by processes that characterize volcanic and hydrothermal systems and their plumbing networks are difficult to observe remotely. Seismic records from these systems tend to be extremely 'noisy', making it difficult to resolve 3D subsurface structures using traditional seismic methods. Easily identifiable high-amplitude bursts within the noise that might be suitable for use with traditional seismic methods (i.e. eruptions) tend to occur relatively infrequently compared to the length of an entire eruptive cycle. Furthermore, while these impulsive events might help constrain the dynamics of a particular eruption, they shed little insight into the mechanisms that occur throughout an entire eruption sequence. It has been shown, however, that the much more abundant low-amplitude seismic 'noise' in these records (i.e. volcanic or geyser 'tremor') actually represents a series of overlapping low-magnitude displacements that can be directly linked to magma, fluid, and volatile movement at depth. This 'noisy' data therefore likely contains valuable information about the processes occurring in the volcanic or hydrothermal system before, during and after eruption events. In this study, we present a new method to comprehensively study how the seismic source distribution of all events - including micro-events - evolves during different phases of the eruption sequence of Sierra Negra Volcano in the Galapagos Islands. We apply a back-projection search algorithm to image sources of seismic 'noise' at Sierra Negra Volcano during a proposed intrusion event. By analyzing

  6. Mulheres negras e não-negras e vulnerabilidade ao HIV/Aids no estado de São Paulo, Brasil Black and non-Black women and vulnerability to HIV/AIDS in São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Fernanda Lopes

    2007-12-01

    Full Text Available OBJETIVO: Analisar características relacionadas à vulnerabilidade individual de mulheres com sorologia positiva para o HIV segundo cor da pele. MÉTODOS: Pesquisa multicêntrica realizada em 1999-2000, em serviços de saúde especializados em DST/Aids no Estado de São Paulo, envolvendo 1.068 mulheres maiores de 18 anos, vivendo com HIV. Informações sociodemográficas e características relacionadas à infecção e aos cuidados em saúde foram obtidas em entrevistas individuais com questionário padronizado. A variável raça/cor foi auto-referida, tendo sido agrupadas como negras as mulheres pretas e pardas. A descrição das variáveis segundo raça/cor foi feita por medidas de tendência central e proporções, e o estudo de associação pelo teste chi2 Pearson. RESULTADOS: As diferenças entre negras e não-negras foram estatisticamente significantivas em relação a: escolaridade; renda mensal, individual e familiar per capita; número de dependentes diretos; oportunidades de ser atendida por nutricionista, ginecologista ou outro profissional médico; de compreender o que o infectologista diz; de falar com o infectologista ou com o ginecologista sobre sua vida sexual; de ter conhecimento correto sobre os exames de CD4 e carga viral; a via sexual de exposição. CONCLUSÕES: O uso de raça/cor como categoria analítica indica caminhos para melhor compreender como as interações sociais, na intersecção gênero e condições socioeconômicas, produzem e reproduzem desvantagens na exposição das mulheres negras aos riscos à sua saúde, assim como impõem restrições quanto ao uso de recursos adequados para o seu cuidado.OBJECTIVE: To analyze the characteristics related to individual vulnerability among HIV seropositive women, according to skin color. METHODS: A multicenter study carried out between 1999 and 2000 in health services specialized in STI/Aids in the state of São Paulo, involving 1,068 women living with HIV who are aged 18

  7. Exigência protéica de juvenis de tambaqui (Colossoma macropomum após privação alimentar Protein requirement of tambaqui juveniles (Colossoma macropomum after feed deprivation

    Directory of Open Access Journals (Sweden)

    Luciana Santos

    2010-09-01

    Full Text Available O objetivo deste trabalho foi avaliar a exigência protéica de juvenis de tambaqui (Colossoma macropomum após a privação alimentar. Os peixes (50,3 ± 0,26g foram submetidos a quatro rações isoenergéticas com diferentes concentrações protéicas (28, 32, 36 e 40% proteína bruta e dois regimes alimentares (com privação e sem privação durante 60 dias. O delineamento experimental foi inteiramente casualizado, em esquema fatorial 4x2, em triplicata. Avaliaram-se os parâmetros de qualidade de água e de desempenho no 1º, 15º e 60º dia de experimento. Os parâmetros da qualidade da água permaneceram dentro dos padrões de cultivo. Não houve mortalidade nos tratamentos testados. Foram observados diferenças entre os tratamentos para os índices de desempenho analisados: taxa de crescimento específico, eficiência alimentar, consumo diário de ração, consumo de proteína bruta, taxa de eficiência protéica e ganho de peso relativo, com exceção do índice hepatossomático. Houve hiperfagia, indicando a existência de crescimento compensatório. Os peixes realimentados com 36% proteína bruta tiveram incremento no teor de gordura visceral e maior deposição de proteína corporal. Estes resultados explicam uma melhora nos dados de ganho de peso, duração da hiperfagia, taxa de crescimento e eficiência alimentar. A privação alimentar não influencia a exigência protéica em juvenis de tambaqui.The aim of this work was evaluate protein requirement of tambaqui (Colossoma macropomum juveniles after feed deprivation. During 60 days, fish (50,3 ± 0,26 g were fed on four isoenergetics diets with different protein content (28, 32, 36 and 40% crude protein at two feeding regimes (with and without feed deprivation under completely random factorial design (4x2 in triplicate. Water quality parameters and performance index were evaluated at 1º, 15º and 60º days. Water quality parameters were kept at normal fish cultivation patterns

  8. Structural indexes and sexual maturity of tambaqui Colossoma macropomum (cuvier, 1818 (Characiformes: Characidae in Central Amazon, Brazil Índices estruturais e maturidade sexual do tambaqui Colossoma macropomum (cuvier, 1818 (Characiformes: Characidae no Amazonas Central, Brasil

    Directory of Open Access Journals (Sweden)

    M. A. VILLACORTA-CORREA

    1999-11-01

    Full Text Available Length, weight, structural index and sexual maturity in tambaqui Colossoma macropomum were analysed. 449 specimens were obtained from the commercial fishing fleet arriving at Manaus Harbour from the floodplain areas from May 1992 to July 1993. The objective of this study is to describe changes in structural index during one hidrological cycle and to interpret them according to the water level fluctuations and to also determine the time, reproductive period and length in sexual maturity. Sex ratio in tambaqui was 1:1 however, the length of females was significantly longer than males'. Length/weight relationship was described by the expression: Pt = 0.00058*Cp2.9039. b value was significantly different from 3 which meant an alometric growth. Lower condition index values (Kn were found from August to October at the end of receding water and dry period. The feeding index was significantly lower during the receding water and dry period. Lower hepatosomatic index values were found in December during the dry period. Fishes in lengths longer than 550 mm which were more common from September to December during the dry period, stored larger cavitary fat reserves. Fishes smaller than the standard length of 550 mm stored less fat reserves and were more common during the rising of the water and flooding period. Spawning period of tambaqui extends from September to February in a total spawning synchronized with "repiquetes"(native term used to name a sudden recending and rising of the water level. Length of tambaqui was 60.69 cm, at sexual maturity.Foi analisada a relação peso comprimento, os índices estruturais e a maturidade sexual do tambaqui Colossoma macropomum. Foram obtidos 449 exemplares procedentes das áreas de várzea do Amazonas Central no porto de desembarque de Manaus de maio de 1992 a julho de 1993. O objetivo deste trabalho foi descrever as modificações nos índices estruturais do tambaqui durante um ciclo hidrológico, interpretá-los de

  9. Determinação da dose inseminante e embriogênese na fertilização artificial de tambaqui (Colossoma macropomum Determination of insemination dose and embryonic development in the artificial fertilization of tambaqui (Colossoma macropomum

    Directory of Open Access Journals (Sweden)

    L.V. Leite

    2013-04-01

    Full Text Available Determinou-se a dose inseminante para fertilização artificial e descreveu-se o desenvolvimento embrionário de tambaqui (Colossoma macropomum. Os gametas foram coletados de reprodutores induzidos hormonalmente. Foi realizada fertilização artificial nas proporções de espermatozoides/ovócito de D1-50.666; D2-75.999; D3-101.332; D4-126.665; D5-151.998. O desenvolvimento embrionário foi acompanhado por meio de observações periódicas em estereoscópio até a eclosão dos ovos. Na fase de fechamento do blastóporo foi calculada a taxa de fertilização nas diferentes doses inseminantes. A porcentagem de fertilização aumentou de forma linear segundo a equação Ŷ =0,050 + 0,00000773X (R²=97,5, atingindo um platô em 84% na proporção de 102.486 espermatozoides/ovócito. Os embriões apresentaram segmentação meroblástica discoidal, típica de ovos telolécitos, com eclosão ocorrendo aos 357 horas-grau após a fertilização. Conclui-se que o desenvolvimento embrionário de tambaqui obedece ao esperado para peixes com ovos telolécitos e recomenda-se o uso da dose inseminante de aproximadamente 100.000 espermatozoides/ovócito na rotina de fertilização artificial dessa espécie.The objective of this research was to determine the insemination dose for artificial fertilization and describe the embryonic development of tambaqui (Colossoma macropomun. The gametes were collected from induced breeding hormonally. An artificial fertilization was performed with different sperm/oocyte ratios of D1-50666, D2-75999, D3-101 332, 126 665-D4, D5-151 998 sperm/oocyte. Embryonic development was monitored through periodic stereoscopic observations until hatching. When embryos reached the blastopore closure stage, the rate of fertilization in different insemination doses was calculated. A regression equation was estimated to determine the ideal proportion of the gametes. The fertilization rate increased linearly according to the equation Ŷ = 0

  10. El caso de la Federación de Comunidades Negras del Alto San Lorenzo

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    John Herlyn Antón Sánchez

    2015-10-01

    Full Text Available En 1994, con la Ley de Desarrollo Agrario, el Estado ecuatoriano otorgó 127.279,28 ha de tierras para uso colectivo a 37 comunidades afroecuatorianas campesinas en elnorte de Esmeraldas. Veinte años después, estas tierras sufren fuertes presiones por la penetración de capitales con fines extractivistas y agroindustriales. Este artículo realiza un examen de la situación de presión sobre dichos territorios y evidencia una pérdida sustancial de los mismos por parte de las comunidades. Esto ha generado graves consecuenciasque atentan contra la cultura, la seguridad alimentaria y el equilibrio entre prácticas sustentables de producción y la conservación de la naturaleza. De forma paradójica, la vulneración al derecho al territorio se produce en un contexto en el que el Ecuador cambia su modelo de Estado, pasando de monocultural a multiétnico, con la Constitución de 2008, y a plurinacional e intercultural, con la Constitución del 2008. Estos marcos normativos consagran a los afrodescendientes como pueblo y como titulares de veintiún derechos colectivos.La investigación se llevó a cabo en el norte de la provincia de Esmeraldas, en los cantones San Lorenzo y Eloy Alfaro. En concreto, en las comunas territoriales asociadas a la Federación de Comunas Negras del Alto San Lorenzo (Fecona, que hace parte de la Comarca Afroecuatoriana del Norte de Esmeraldas (Cane. Esta comarca es una red de organizaciones de base étnico-territoriales que defienden los derechos al territorio ancestral afrodescendiente en Ecuador. En el norte de Esmeraldas, precisamente, se desarrolla una importante experiencia de defensa del derecho al territorio ancestral afrodescendiente del Ecuador. Gracias a las luchas de las organizaciones campesinas afroecuatorianas, el Estado ha implementado una serie de derechos para la preservación y el fortalecimiento de su identidad, tradiciones y formas de organización social. Este reconocimiento viabiliza

  11. "Novela negra con argentinos" : escritura, transgresión y búsqueda en la narrativa de Luisa Valenzuela

    OpenAIRE

    Lucero Sánchez, Itxaso

    2013-01-01

    [ES] El presente proyecto tiene como objetivo el análisis del texto “Novela negra con argentinos” (1990) de Luisa Valenzuela, una de las autoras argentinas más estudiadas de la época contemporánea. La elección de esta obra para mi estudio se debe a que reúne los principales rasgos de la poética de la autora, esto es, la tríada “cuerpo, palabra, poder”; así como las prácticas de “escribir con el cuerpo” y “regodeo en el asco”. En este trabajo realizo un estudio de estos elementos en relación c...

  12. Deformation and stress-change modeling at Sierra Negra volcano, Galapagos, from ENVISAT INSAR and GPS observations

    Science.gov (United States)

    Jonsson, Sigurjon; Chadwick, W.W.; Poland, M.; Geist, D.

    2008-01-01

    We use radar interferograms and GPS observations to constrain models of magma accumulation and faulting at Sierra Negra volcano, Galápagos, during the years before its 2005 eruption. The data have shown ~5 m of pre-eruption uplift and multiple trapdoor faulting events on an intra-caldera fault system. We find the pattern of uplift to be consistent with an inflating sill at 2.2 km depth under the caldera. Our deformation modeling and stress-change calculations suggest that the inflating sill triggered faulting on an inward- dipping thrust fault and that the faulting in turn relieved the pressure within the sill. This sill-fault interaction tends to thicken the sill and limit its lateral extent within the area bounded by the fault.

  13. El Estado neoliberal y las mujeres indígenas. Un estudio de caso de la Sierra Negra de Puebla

    Directory of Open Access Journals (Sweden)

    Carolina Muñoz Rodríguez

    2012-01-01

    Full Text Available El presente artículo tiene como objetivo analizar el desarrollo de capacidades en mujeres indígenas de la Sierra Negra de Puebla, producto de la intervención estatal. La metodología empleada fue mixta: una encuesta, tres talleres, ocho entrevistas a profundidad y observación participante. Se identifican cinco instituciones gubernamentales de relevancia para las mujeres: Sedesol, cdi, Sagarpa/sdr, Semarnat e inea. Se constata la fragmentación de programas, los cuales han contribuido (tímida y erráticamente al desarrollo de algunas capacidades. El Estado neoliberal se muestra incapaz de impulsarlas de manera más contundente y ordenada debido a las contradicciones existentes entre la apertura comercial a productos agrícolas del exterior y la política de subsidios diseñados para combatir la pobreza que esta misma apertura generó.

  14. Gamma-ray astronomy: From Fermi up to the HAWC high-energy {gamma}-ray observatory in Sierra Negra

    Energy Technology Data Exchange (ETDEWEB)

    Carraminana, Alberto [Instituto Nacional de Astrofisica, Optica y Electronica Luis Enrique Erro 1, Tonantzintla, Puebla 72840 (Mexico); Collaboration: HAWC Collaboration

    2013-06-12

    Gamma-rays represent the most energetic electromagnetic window for the study of the Universe. They are studied both from space at MeV and GeV energies, with instruments like the Fermi{gamma}-ray Space Telescope, and at TeV energies with ground based instruments profiting of particle cascades in the atmosphere and of the Cerenkov radiation of charged particles in the air or in water. The Milagro gamma-ray observatory represented the first instrument to successfully implement the water Cerenkov technique for {gamma}-ray astronomy, opening the ground for the more sensitive HAWC {gamma}-ray observatory, currently under development in the Sierra Negra site and already providing early science results.

  15. Estudo da vegetação relacionada com a alimentação do "pacu" (Colossoma mitrei-Berg(1895 no Pantanal mato-grossense

    Directory of Open Access Journals (Sweden)

    José Elias de Paula

    1988-01-01

    Full Text Available Os 102 aparelhos digestivos analisados foram provenientes de espécimes capturados no Pantanal de Mato Grosso, nos municípios do Poconé e Barão de Melgaço. O estudo da vegetação aquática, ciliar e de áreas inundáveis foi conduzido nas áreas onde os espécimes de "pacu" foram capturados. Foram considerados também dados biométricos do "pacu", tais como: comprimento total do esôfago, do intestino e do estômago.This study is part of the "pacu" (Colossoma mitrei Berg 1895 project of biotecnology. The studies were conducted in areas of Pantanal, municipalities of Poconé and Barão de Melgaço (Mato Grosso, Brasil. In conjunction with the vegetation study, the stomach contents od 102 espécimes of "pacu" were analized. The results indicate that Colossoma mitrei's custom feeding is herbivorous.

  16. A REPRESENTAÇÃO DAS MULHERES NEGRAS NO MERCADO DE TRABALHO NAS CIDADES BRASILEIRAS NO SÉCULO XIX

    Directory of Open Access Journals (Sweden)

    Madalena Dias Freitas

    2012-07-01

    Full Text Available O presente artigo desenvolve uma leitura sobre a representação das mulheres negras nos espaços públicos de cidades brasileiras no século XIX, ressaltando as atividades exercidas pelas mulheres escravas, pobres, forras e livres no mercado de trabalho urbano, que sobreviviam atuando em diversas profissões como lavadeiras, quitandeiras, vendedoras, amas-de-leite, engomadeiras e cozinheiras. Mencionando aquelas que fazem parte dos trabalhos domésticos, algumas livres, algumas escravas e outras escravas de aluguel. Concluímos que, nas atividades de escravas de aluguel essas mulheres eram exploradas por seus senhores que obtinham uma renda significante. Estabelecemos, portanto, uma discussão à cerca do papel das amas-de-leite de aluguel, personagens importantes na cultura urbana do período, pois, além da atividade de amamentação, elas se alternavam em atividades domésticas como mucamas e vendedoras. Fazemos ainda uma discussão sobre a relação de afetividade estabelecida entre criança e a ama-de-leite, provocando certa influência no processo de aprendizagem e na formação cultural das crianças brancas que assimilaram tanto a linguagem como variados costumes e hábitos africanos. Nesse contexto, esse trabalho destaca ainda a presença das mulheres negras nas ruas das principais cidades brasileiras, evidenciando estas vendedoras com seus tabuleiros de quitutes, ocupando becos e travessas, dividindo o espaço do comércio de rua com outros negros escravos e livres.

  17. RACISMO CORDIAL DESCONSTRUÍDO:UMA LEITURA PÓS-POSITIVISTA DO PAPEL DA MULHER NEGRA NO BRASIL COLONIAL

    Directory of Open Access Journals (Sweden)

    Adriana do Carmo Figueiredo

    2013-10-01

    Full Text Available RESUMO:Este artigo tem como objetivo fazer uma leitura do papel social do escravo no Brasil regencial, destacando-se os aspectos feministas da luta da mulher negra contra o cativeiro e pela manutenção do núcleo familiar formado na colônia. O fio condutor será o livro Slave Life in Rio de Janeiro 1808 - 1850 (A vida escrava no Rio de Janeiro 1808 – 1850, tese de doutorado da pesquisadora norte-americana Mary Karasch. Ela é apontada por defensores de teorias feministas como aquela que fez o dever de casa de História do Brasil, contrariando o mito propagado por Gilberto Freire de que havia uma relação harmônica entre a casa grande e a senzala, o quepropiciava a possibilidade de ascensão social ao escravo brasileiro.PALAVRAS-CHAVE: construtivismo; feminismo; mulher negra; construção social; relações internacionais.   ABSTRACT: This article aims to make a reading of the social role ofthe slave in Brazil regency period, highlighting the feminist aspects of the black women fight against captivity and for the maintenance of the family unit formed in the colony. The common thread is the book Slave Life in Rio de Janeiro 1808 – 1850, the doctoral thesis by American researcher Mary Karasch. She is pointed by feminist scholars as the one that did the History of Brazil homework, contrary to the myth propagated by Gilberto Freire work that there was a harmonius relationship between the big house and the slave quarters, which fed the possibility of social mobilitiy to the Brazilian slaves.   KEYWORDS:  constructivism; feminism; black woman; social construction; international relations.Recebido: 07/12/2013      Aceito: 06/07/2013

  18. DETECÇÃO DE FUNGOS PATOGÊNICOS EM SEMENTES DE ACÁCIA-NEGRA (Acacia mearnsii De Wild

    Directory of Open Access Journals (Sweden)

    Flávia Elise Meneghini dos Santos

    2000-10-01

    Full Text Available A presença de fungos pode reduzir a capacidade germinativa de um lote de sementes, causar a morte de plântulas ou transmitir doenças para plantas adultas. É necessário conhecer os agentes, as causas e as conseqüências decorrentes da contaminação por fungos patogênicos. Desse modo, o presente estudo teve como objetivo identificar os fungos associados às sementes de Acacia mearnsii De Wild, armazenadas a 5°C, por um período de 12 meses. Foram utilizadas sementes de acácia-negra oriundas de plantio comercial, aos 4 anos de idade cuja procedência é África do Sul. As sementes foram colhidas em três épocas distintas: (i quando com frutos verdes e/ou pigmentados; (ii quando com frutos negros e início de abertura das vagens; (iii quando com sementes coletadas no solo, após a dispersão natural, sendo empregadas como testemunha. Os fungos associados às sementes foram: Botryodiplodia sp., Botrytis sp. (família Moniliaceae, Cladosporium sp.(família Dematiaceae, Cylindrocladium sp., Fusarium sp., Penicillium sp., Pestalotia sp., Rhizoctonia sp., Trichoderma sp. e outros fungos não identificados. De maneira geral, a autoclavagem das sementes promoveu maiores taxas de germinação e a eliminação de fungos associados. As sementes, que apresentaram maior contaminação por fungos, foram aquelas oriundas da coleta no solo. Os fungos de solo observados, que poderiam ocasionar danos em plântulas no viveiro e, simultaneamente, estarem associados à gomose em acácia-negra, foram: Botrytis sp., Cylindrocladium sp.

  19. An outbreak of myxozoan parasites in farmed freshwater fish Colossoma macropomum (Cuvier, 1818 (Characidae, Serrasalminae in the Amazon region, Brazil

    Directory of Open Access Journals (Sweden)

    Marcela Videira

    2016-05-01

    Full Text Available The tambaqui (Colossoma macropomum is a native fish species that is farmed most frequently and in the largest quantities throughout Brazil. The high production of this species from fish farms has contributed to the occurrence of emerging parasites, which may compromise fish health and productivity. In a batch of 2500 tambaqui fry acquired for experimental farming procedures in Brazil, a mortality rate of 80% was observed, with the fish swimming erratically and gasping for air at the water surface. From among the specimens that were still alive, 60 individuals were selected at random. Organs or fragments of organs containing lesions and/or cysts were examined under an optical microscope to investigate for the presence of parasitic spores. Of the 60 specimens of tambaqui analyzed, 83.3% were found to be infected in different organs, such as the gills, liver, and gallbladder with myxosporidian species belonging to four genera, namely, Myxobolus, Ellipsomyxa, Henneguya and Thelohanellus. The parasite with the greatest prevalence was Myxobolus sp., located in the gills (70%, followed by Henneguya sp. in the gills region (68.3%, Myxobolus sp. in the liver (63.3%, Thelohanellus sp. in the liver (58.3%, and Ellipsomyxa in the gallbladder (50%. This is the first report of parasitic infection caused by the genera Ellipsomyxa and Thelohanellus in C. macropomum. The present study reported the second incidence of the occurrence of the genus Thelohanellus in South America. This study suggested that the mortality among C. macropomum specimens was caused by the outbreak of myxosporidians.

  20. Structural indexes and sexual maturity of tambaqui Colossoma macropomum (Cuvier, 1818) (Characiformes: Characidae) in central Amazon, Brazil.

    Science.gov (United States)

    Villacorta-Correa, M A; Saint-Paul, U

    1999-11-01

    Length, weight, structural index and sexual maturity in tambaqui Colossoma macropomum were analysed. 449 specimens were obtained from the commercial fishing fleet arriving at Manaus Harbour from the floodplain areas from May 1992 to July 1993. The objective of this study is to describe changes in structural index during one hidrological cycle and to interpret them according to the water level fluctuations and to also determine the time, reproductive period and length in sexual maturity. Sex ratio in tambaqui was 1:1 however, the length of females was significantly longer than males'. Length/weight relationship was described by the expression: Pt = 0.00058*Cp2.9039. b value was significantly different from 3 which meant an alometric growth. Lower condition index values (Kn) were found from August to October at the end of receding water and dry period. The feeding index was significantly lower during the receding water and dry period. Lower hepatosomatic index values were found in December during the dry period. Fishes in lengths longer than 550 mm which were more common from September to December during the dry period, stored larger cavitary fat reserves. Fishes smaller than the standard length of 550 mm stored less fat reserves and were more common during the rising of the water and flooding period. Spawning period of tambaqui extends from September to February in a total spawning synchronized with "repiquetes" (native term used to name a sudden recending and rising of the water level). Length of tambaqui was 60.69 cm, at sexual maturity. PMID:23505652

  1. Tiempo de latencia para semen colectado de Colossoma macropomum “Gamitana” en solución sacarosa

    Directory of Open Access Journals (Sweden)

    Ehrlich Llasaca-Calizaya

    2015-01-01

    Full Text Available El objetivo fue estimar el tiempo de latencia (almacenamiento, para el semen de Colossoma macropomum, “gamitana” en solución de 400 mM de Sacarosa. Se consideró aceptable los niveles de motilidad superiores al 40%, lo cual garantiza eficientes tasas de fertilización. Para el desarrollo del experimento se colectó 2 lotes de semen inmótiles de gamitana (inducidos con Conceptal®, los cuales posteriormente fueron activados con agua destilada. El primer lote estuvo constituido por semen en sacarosa 400 mM, puro, a temperatura ambiente y refrigerado (4°C. La motilidad fue evaluada, cada hora, hasta la 7ma hora post colecta. El segundo lote con un semen en sacarosa 400mM a temperatura refrigerada y evaluada cada 12 horas. Los resultados del primer lote de semen demuestran que a partir de la 7ma hora hacia delante los índices de motilidad caen significativamente por debajo del 40%. Los resultados del segundo lote demuestran la viabilidad de utilizar solución de sacarosa, como medio de conservación, para mantener semen refrigerado por 2 días y activarlos con agua destilada. El proceso de extraer y colocar repetidas veces la misma muestra en refrigeración, limita el tiempo de viabilidad de semen con sacarosa en 8 horas aproximadamente. La utilización de sacarosa como medio para almacenar semen inmotil viable de gamitana, ayuda a conservar los espermatozoides por tiempos relativamente cortos.

  2. VALOR AGREGADO DE LAS ESPECIES Brycon erythropterum (SÁBALO, Colossoma macropomum (GAMITANA, Arapaima gigas (PAICHE y Agouti paca (MAJAS

    Directory of Open Access Journals (Sweden)

    Doylith Vásquez Jurafo

    2012-12-01

    Full Text Available El presente trabajo tiene como objetivo  la obtención de  productos mínimamente procesados (PMP de Brycon erythropterum (SÁBALO, Colossoma macropomum (GAMITANA, Arapaima gigas (PAICHE, y Agouti paca (MAJAS congelado y empacado al vacio. Para las especies piscícolas, se ha aplicado un diseño factorial de 32 con dos factores de estudios: concentración de NaCl en la solución osmótica con tres niveles (15, 20 y 25 % y temperatura de proceso  con tres niveles de estudio (5, 10 y 15 °C. Para el Agouti paca (majas se aplico un diseño factorial completamente aleatorizado con tres factores de estudio: tiempo de proceso (30, 60 y 90 minutos, método de ahumado (ahumado líquido y ahumado en caliente y tipo de corte del músculo (partes y filetes. Para trabajar se ha diseñado y montado un deshidratador Osmótico teniendo en cuenta, diámetro de tubería, deshidratador propiamente dicho con doble chaqueta, capacidad del deshidratador en función del volumen de la Salmuera.  Todos los productos se obtuvieron  en procesos con 10 °C y tiempos entre 30 min y  90 min. El tiempo de vida en almacenamiento en las evaluaciones de aroma y color en majas tienen una vida útil de 4 meses de almacenados a -18 °C. Los análisis microbiológicos realizados a los PMP no pasan los límites de la NTS Nº 071 MINSA/DIGESA V01.

  3. His Excellency Mr Ion Iliescu, President of Romania flanked by Jim Allaby (left, light suit) and Michel Della Negra. Far left Dan Nica, Minister for Communications and Information Technology and Constantin Valeca, Minister Delegate for Research

    CERN Multimedia

    Maximilien Brice

    2001-01-01

    Photo 01 : Michel Della Negra explains some of the general principles behind CMS to President Iliescu. Photo 04 : Director General Luciano Maiani watches as Romanian President Iliescu signs the CERN guest book

  4. Effects of formation water from the Urucu petroleum plant on hematological parameters and ionic content of Colossoma macropomum and Glyptoperichthys joselimaianus; Influencia da agua de formacao da extracao de petroleo do Rio Urucu sobre aspectos hematologicos e conteudo ionico de Colossoma macropomum e Glyptoperichthys joselimaianus

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, Jose Teodoro Maco

    1997-07-01

    Petroleum plant activities in the Amazon result in a series of negative impacts on the natural resources. The formation water, a secondary product of oil production, carries high salt levels and its environmental release results in salinization of several water bodies in the Amazon. The effect of formation water on vegetal and animal physiology is unknown. This paper estimated the effects of formation water from the Urucu petroleum plant at different dilutions on the haematocrit, hemoglobin concentration, red blood cell counts, mean corpuscular volume, mean hemoglobin concentration, mean corpuscular hemoglobin concentration, blood oxygen content, partial pressure of oxygen, glucose and lactate levels, plasma and intra erythrocytic levels of Na{sup +}, K{sup +} and Ca{sup 2+}, Phe and p Hi of Colossoma macropomum (Branchial breather) and Glyptoperichthys joselimaianus (facultative air breather). To maintain tissue oxygen supply the studied species adjusted several of these parameters. Cell swelling, high lactate levels, decrease in p He and p Hi have been observed in G. joselimaianus exposed to formation water. The decrease in p Hi result in a decrease of Hb-O{sub 2} affinity in the erythrocytes. On the other hand, an increase in p He and p Hi were observed in C. macropomum. Significant changes in ionic content, in particular plasma and erythrocytic levels of sodium, have been observed for both species exposed to formation water. A decrease of plasma potassium was observed in G. joselimaianus. The intra erythrocytic levels of calcium increased in Colossoma and Glyptoperichthys but no significant change in plasma levels of calcium was observed. The disturbance in blood ion levels resulted in a decreased of blood oxygen content. Colossoma seems to better buffer the effects of formation water exposure than Glyptoperichthys. (author)

  5. Farinha de folha de leucena (Leucaena leucocephala Lam. de wit) como fonte de proteína para juvenis de tambaqui (Colossoma macropomum CUVIER, 1818) Leucaena leaf flour (Leucaena leucocephala Lam. of wit) as a protein source for juveniles of tambaqui (Colossoma macropomum Cuvier, 1818)

    OpenAIRE

    Geraldo Pereira Junior; Manoel Pereira Filho; Rodrigo Roubach; Paula de Sousa Barbosa; Eduardo Shimoda

    2013-01-01

    O tambaqui (Colossoma macropomum) é um peixe onívoro, natural da bacia amazônica, que possui elevado valor comercial. Características de rusticidade e desempenho produtivo destacam esta espécie para criação em cativeiro. Contudo, em criações comerciais de peixes, os custos com alimentação podem corresponder de 60 a 80% dos custos totais de produção, sendo a proteína o nutriente mais caro da dieta. O objetivo deste trabalho foi avaliar o desempenho produtivo de juvenis de tambaqui alimentados ...

  6. Optimum dietary protein requirement for Amazonian Tambaqui, Colossoma macropomum Cuvier, 1818, fed fish meal free diets Exigência protéica de juvenis de tambaqui, Colossoma macropomum Cuvier, 1818, alimentados com rações livres de farinha de peixe

    OpenAIRE

    César Augusto Oishi; Lawrence C Nwanna; Manoel Pereira Filho

    2010-01-01

    Fish meal free diets were formulated to contain graded protein levels as 25% (diet 1), 30% (diet 2), 35% (diet 3) and 40% (diet 4). The diets were fed to tambaqui juveniles (Colossoma macropomum) (46.4 ± 6.3g) in randomly designed recirculating systems for 60 days, to determine the optimum protein requirement for the fish. The final weight of the fish, weight gain (28.1, 28.5, 32.2, 28.0g) and specific growth rate increased (P>0.05) consistently with increasing dietary protein up to treatment...

  7. Influence of anticoagulants and blood storage on hematological values in tambaqui, Colossoma macropomum - DOI: 10.4025/actascibiolsci.v20i0.4465 Influência de anticoagulantes e estocagem de sangue em valores hematológicos de tambaquis, Colossoma macropomum - DOI: 10.4025/actascibiolsci.v20i0.4465

    OpenAIRE

    Marcos Tavares-Dias; Elziane F. Silva Sandrim

    1998-01-01

    Foram empregados, neste estudo, tambaqui Colossoma macropomum Cuvier, 1818 (Osteichthyes: Characidae). O sangue de cada animal foi coletado através de punção da veia caudal utilizando-se seringas heparinizadas (5000 IU) ou contendo EDTA 10%. Após a coleta do sangue procedeu-se imediatamente à medida do hematócrito e da taxa de concentração da hemoglobina. Posteriormente, o sangue foi deixado em temperatura ambiente, onde permaneceu durante 10 horas, quando se realizou novamente a medida do pe...

  8. Refletindo sobre violência de gênero e mulheres negras : a experiência da Ong Maria Mulher/ Porto Alegre – Brasil

    OpenAIRE

    Pereira Oliveira, Maria Luisa

    2008-01-01

    As condições socioeconômicas, políticas e culturais das mulheres negras são precárias, a maioria se encontra abaixo da linha da pobreza, com baixa escolaridade, em situação de exclusão social e sem acesso efetivo às políticas públicas. A experiência da ONG Maria Mulher evidencia a discriminação racial em relação a mulheres negras como um fator que potencializa a violência de gênero e causa prejuízos à qualidade de vida e saúde das mulheres. Essa pesquisa buscou compreender os efeitos da discr...

  9. Uso do probiótico Efinol®L durante o transporte de tambaqui (Colossoma macropomum The use of probiotic Efinol®L during transportation of tambaqui (Colossoma macropomum

    Directory of Open Access Journals (Sweden)

    E.S. Carvalho

    2009-12-01

    Full Text Available Verificou-se a eficácia da adição de um probiótico potencialmente redutor de estresse, durante o transporte de juvenis de tambaqui (Colossoma macropomum. Os peixes foram transportados em sacos plásticos com probiótico (20mg/L ou sem adição do produto à água. O transporte teve duração de 16 horas. Após o transporte, os peixes foram colocados em caixas de 150L para monitorar a recuperação por 96 horas. Para o monitoramento do estresse, avaliaram-se a glicose, o hematócrito e a hemoglobina, além das características de qualidade da água. Após o transporte, a glicose aumentou significativamente, permaneceu elevada nas amostras por 24 e 48 horas e retornou à concentração inicial, 96 horas depois, em ambos os tratamentos. A hemoglobina não se alterou durante e após o transporte, e o hematócrito aumentou significativamente no tratamento sem probiótico nos tempos 24 e 48 horas após o transporte. O probiótico utilizado não foi eficiente em suprimir as respostas de estresse em tambaqui durante o transporte, porém foi eficiente em suprimir as respostas pós-transporte.The effectiveness of the addition of a potentially stress reducing probiotic during transportation of tambaqui juveniles was studied. Fish were transported with (20mg/L and without probiotic in the water. The transport duration was 16 hours. After transportation, fish were placed in 150L tanks to monitor their recovery for 96-hours. The following stress parameters were evaluated: glucose, hematocrit, and hemoglobin, and also some water quality parameters. The responses of glucose presented similar pattern between the treatments. Glucose concentrations significantly increased after transportation, kept high for 24 and 48-hours after transportation, and returned to control-like concentration at 96-hours after transportation. Hemoglobin did not present significant difference during or after transportation. Hematocrit significantly increased in probiotic

  10. Relação entre a temperatura e o molhamento foliar no monocíclo da Sigatoka-negra

    Directory of Open Access Journals (Sweden)

    Cleilson do Nascimento Uchôa

    2012-06-01

    Full Text Available A influência da temperatura (21, 24, 27 e 30 °C e da duração do tempo de molhamento foliar (0, 12, 24, 48 e 72 horas na penetração do agente causal da Sigatoka-negra (Mycosphaerella fijiensis foi quantificada em ambiente controlado. A área abaixo da curva do progresso da doença (AACPD e a incidência foram influenciadas pela temperatura e pela duração do tempo de molhamento foliar. Foram constatadas diferenças significativas (P=0,05 nos valores da AACPD para as diferentes temperaturas, bem como verificada a interação significativa (P=0,05 entre temperaturas e o molhamento foliar. Em todas as temperaturas foi possível a observação de sintomas, entretanto, a maior AACPD foi observada em folhas inoculadas que permaneceram na temperatura de 24 e 27°C, a partir de 48 horas de molhamento foliar. Nas temperaturas de 21ºC e 30°C a incidência de Sigatoka-negra foi menor. O período de molhamento foliar mínimo para o progresso da doença foi de 24 horas. Não foram observados sintomas de Sigatoka-negra em folhas inoculados com o molhamento foliar de 0 hora e 12 horas em todas as temperaturas. As folhas assintomáticas, após 5 dias em câmara úmida apresentavam sintomas característicos de Sigatoka-negra, demonstrando que os conídios inoculados nas folhas permaneceram viáveis por um período na ausência de água livre na folha.

  11. Responses of an Amazonian teleost, the tambaqui (Colossoma macropomum), to low pH in extremely soft water.

    Science.gov (United States)

    Wood, C M; Wilson, R W; Gonzalez, R J; Patrick, M L; Bergman, H L; Narahara, A; Val, A L

    1998-01-01

    Our goal was to compare the internal physiological responses to acid challenge in an acidophilic tropical teleost endemic to dilute low-pH waters with those in nonacidophilic temperate species such as salmonids, which have been the subjects of most previous investigations. The Amazonian tambaqui (Colossoma macropomum), which migrates between circumneutral water and dilute acidic "blackwater" of the Rio Negro, was exposed to a graded low-pH and recovery regime in representative soft water (Na+ = 15, Cl- = 16, Ca2+ = 20 mumol L-1). Fish were fitted with arterial catheters for repetitive blood sampling. Water pH was altered from 6.5 (control) to 5.0, 4.0, 3.0, and back to 6.5 (recovery) on successive days. Some deaths occurred at pH 3.0. Throughout the regime, there were no disturbances of blood gases (O2 and CO2 tensions and contents) or lactate levels, and only very minor changes in acid-base status of plasma and red cells. However, erythrocytic guanylate and adenylate levels increased at pH's less than or equal to 5.0. Down to pH 4.0, plasma glucose, cortisol, and total ammonia levels remained constant, but all increased at pH 3.0, denoting a stress response. Plasma Na+ and Cl- levels declined and plasma protein concentration increased at pH 3.0, indicative of ionoregulatory and fluid volume disturbance, and neither recovered upon return to pH 6.5. Cortisol and ammonia elevations also persisted. Transepithelial potential changed progressively from highly negative values (inside) at pH 6.5 to highly positive values at pH 3.0; these alterations were fully reversible. Experimental elevations in water calcium levels drove the transepithelial potential positive at circumneutral pH, attenuated or prevented changes in transepithelial potential at low pH, and reduced Na+ and Cl- loss rates to the water during acute low-pH challenges. In general, tambaqui exhibited responses to low pH that were qualitatively similar but quantitatively more resistant than those previously

  12. Multiplex PCR panel of microsatellite markers for the tambaqui, Colossoma macropomum, developed as a tool for use in conservation and broodstock management.

    Science.gov (United States)

    Hamoy, I G; Santos, S

    2012-01-01

    The tambaqui, Colossoma macropomum, native to Brazil, is widely used in aquaculture systems. We developed a multiplex PCR panel for this species, comprising 12 microsatellite loci. This panel was used to genotype 73 specimens collected from Juruti, a city in the Brazilian Amazon. The mean number of alleles per locus was 8.8, the mean observed heterozygosity was 0.76, and the combined power of discrimination and the combined power of exclusion were 0.99999999999999993 and 0.999991762, respectively. We observed no significant deviation from Hardy-Weinberg equilibrium in this population. All amplified alleles were clearly typed, and easily interpretable results were obtained. This method will be useful for paternity analysis, population genetics and conservation studies, as well as for selective breeding programs for C. macropomum. PMID:22370880

  13. Estudo da vegetação relacionada com a alimentação do "pacu" (Colossoma mitrei-Berg(1895) no Pantanal mato-grossense

    OpenAIRE

    José Elias de Paula; Manoel Batista de Morais Filho; Geraldo Bernardino; José Sávio Colares de Melo; Valdir Aparecido Ferrari

    1988-01-01

    Os 102 aparelhos digestivos analisados foram provenientes de espécimes capturados no Pantanal de Mato Grosso, nos municípios do Poconé e Barão de Melgaço. O estudo da vegetação aquática, ciliar e de áreas inundáveis foi conduzido nas áreas onde os espécimes de "pacu" foram capturados. Foram considerados também dados biométricos do "pacu", tais como: comprimento total do esôfago, do intestino e do estômago.This study is part of the "pacu" (Colossoma mitrei Berg 1895) project of biotecnology. T...

  14. Determinação da dose inseminante e embriogênese na fertilização artificial de tambaqui (Colossoma macropomum)

    OpenAIRE

    L.V. Leite; M.A.P. Melo; F.C.E. Oliveira; J.P.S. Pinheiro; C.C. Campello; J.F. Nunes; C.S.B. Salmito-Vanderley

    2013-01-01

    Determinou-se a dose inseminante para fertilização artificial e descreveu-se o desenvolvimento embrionário de tambaqui (Colossoma macropomum). Os gametas foram coletados de reprodutores induzidos hormonalmente. Foi realizada fertilização artificial nas proporções de espermatozoides/ovócito de D1-50.666; D2-75.999; D3-101.332; D4-126.665; D5-151.998. O desenvolvimento embrionário foi acompanhado por meio de observações periódicas em estereoscópio até a eclosão dos ovos. Na fase de fechamento d...

  15. A gomose da acácia-negra no Brasil: a review The gummosis of black wattle in Brazil

    Directory of Open Access Journals (Sweden)

    Álvaro Figueredo dos Santos

    2007-06-01

    Full Text Available A acácia-negra (Acacia mearnsii é cultivada no Brasil, especialmente no Estado do Rio Grande do Sul, visando tanto à produção de tanino, a partir da casca, quanto o uso da madeira para papel, celulose, carvão, lenha e chapas de aglomerados. A gomose causada por Phytophthora nicotianae e P. boehmeriae, é o seu principal problema fitossanitário. Discute-se nesta revisão a existência de dois padrões distintos de sintomatologia da gomose de Phytophthora que têm sido observados nas plantações brasileiras: gomose basal, associada a P. nicotianae, e gomose generalizada, mais associada a P. boehmeriae. São discutidos aspectos relacionados à etiologia, à epidemiologia e às estratégias de controle.The black wattle (Acacia mearnsii is cultivated in Brazil for bark tannin, paper, cellulose, plywood, charcoal and firewood production. Gummosis of Phytophthora, caused by P. nicotianae and P. boehmeriae is the main disease problem on black wattle. The existence of two distinct symptom patterns observed on plants in the commercial fields are: butt gummosis which is associated with P. nicotianae and general gummosis more related to P. boehmeriae. Etiological, epidemiological and control aspects of this disease are presented and discussed on this review.

  16. Proceso de formación de una red regional: Región turística de las Agulhas Negras - RJ - Brasil The Process of Construction of Tourism Regional networks: The Tourist Region of Agulhas Negras-RJ, Brazil

    Directory of Open Access Journals (Sweden)

    Aguinaldo Cesar Fratucci

    2011-12-01

    Full Text Available Este artículo se propone analizar el proceso de constitución de las redes regionales de turismo establecidas a partir de la estructuración de territorios-redes a escala regional. Basándose en las categorías de territorio-red y redes regionales y en la región turística de las Agulhas Negras-RJ, Brasil, como objeto empírico de observación, este estudio propone que la consolidación de redes regionales de turismo puede estructurar nuevas instancias público-privadas de gestión del ordenamiento del desarrollo turístico; como es el caso del CONRETUR de las Agulhas Negras. Se realizó una investigación estructurada principalmente a partir de la técnica de la observación participante, además de entrevistas personales y por medios electrónicos.This article aims at analyzing the process of constitution of tourism regional networks established from the structuring of networks-territories in regional scale. Having as theoretical basis territory-network and regional network basis as well as the tourist region of Agulhas Negras-RJ as empirical object, this text proposes that the consolidation of tourism regional networks may structure new public-private instances of tourist development reordering, as in the case of CONRETUR Agulhas Negras - RJ. In order to do that, structured researches have been used, mainly from the technique of participant observation, besides personal interviews and electronic means.

  17. Effect of gender on growth performance, carcass traits and meat quality of calves of Avilena-Negra Iberica breed

    Energy Technology Data Exchange (ETDEWEB)

    Daza, A.; Rey, A. I.; Lopez Carrasco, C.; Lopez-Bote, C. J.

    2012-11-01

    The objective of this experiment was to study the effect of gender on growth performance and carcass and meat quality of calves of Avilena-Negra Iberica breed. Sixteen calves, eight males and eight females, were used. The calves were fattened under intensive conditions, housed in confinement and fed with the same feed and cereal straw from 230.7 to 478.3 kg. The males grew more than the females (1.390 vs 0.932 kg day{sup 1} respectively). Carcass weight, carcass length, leg length, leg perimeter, carcass and leg compactness, legs, fore-quarters and loins weights and forequarters percentage regarding carcass weight were higher (p < 0.05) in males than in females. The gender had not significant influence on CIE a*, b*, chroma and hue variables but CIE L* value was significantly (p < 0.05) lower in males than in females. The a* value decreased and b* and hue values increased with ageing time. The subcutaneous back fat from the females had significantly (p < 0.05) higher C14:0, C16:0, C16:1, C18:1 n-9, S MUFA and lower C10:0, C18:0, C18:2 n-6, C18:3 n-3, C20:0, C20:3 n-9, C20:4 n-6, C22:5 n-3, {Sigma} n-6, {Sigma} n-3 and {Sigma} PUFA proportions than that from males. It is concluded that the gender has influence on growth performance, carcass traits and fatty acid composition of subcutaneous backfat; gender does not have effect on instrumental colour variables; and meat colour can reach acceptable values for consumers until four days after slaughter. (Author) 34 refs.

  18. Las Pinturas Negras de Goya y la Quinta del Sordo. Precisiones sobre las teorías de Juan José Junquera

    Directory of Open Access Journals (Sweden)

    Glendinning, Nigel

    2004-09-01

    Full Text Available In 2003, three publications of Juan José Junquera cast doubt on the authenticity of Goya's Black Paintings. The present article disputes the validity of Professor Junquera's conclusions and re-examines the relevant documents in detail.

    En 2003, tres publicaciones de Juan José Junquera pusieron en tela de juicio la paternidad de las Pinturas Negras de Goya. El presente artículo cuestiona las conclusiones del profesor Junquera, examinando con detalle la base documental de sus teorías.

  19. Las arenas negras de Mejías: nueva fuente para la obtención de consumibles para la soldadura por arco eléctrico

    OpenAIRE

    Amado Cruz-Crespo; Luis Gómez-Rodríuez; Lorenzo Perdomo-González; Rafael Quintana-Puchol

    2001-01-01

    A partir de la caracterización química y mineralógica de las fracciones pesadas, magnéticas y electromagnéticas de las arenas negras del placer de Mejías, se logró confeccionar una carga metalúrgica para obtener una escoria útil como matriz de fundentes para la soldadura automática (SAW) y una ferroaleación como carga aleante para diferentes consumibles de soldadura por arco eléctrico. La escoria obtenida presenta una composición de óxidos que garantiza las propiedades metalúrgicas y tecnológ...

  20. Modelado numérico de la deriva y envejecimiento de los hidrocarburos vertidos al mar: aplicación operacional en la lucha contra las mareas negras

    OpenAIRE

    Comerma Piña, Eric

    2004-01-01

    Uno de los principales problemas que afectan al medio marino son los repetidos episodios de contaminación por hidrocarburos. A los grandes derrames provocados por petroleros accidentados hay que sumarle un volumen anual prácticamente idéntico, debido a vertidos operacionales, residuales o derivados del creciente uso de los combustibles fósiles. En el caso de las mareas negras, las consecuencias socio-económicas son terribles para las regiones afectadas. Pero por otro lado, la contaminación de...

  1. Heliconia psittacorum: hospedeira de Mycosphaerella fijiensis, agente causal da sigatoka-negra da bananeira First reporter of Mycosphaerella fijiensis on Heliconia psittacorum leaves

    OpenAIRE

    Luadir Gasparotto; J. Clério R. Pereira; Urben, Arailde F.; Rogério E Hanada; Mirza C. N. Pereira

    2005-01-01

    Em setembro de 2003, em Manaus, Amazonas, foram observadas manchas foliares, muito semelhantes àquelas de sigatoka-negra causada por Mycosphaerella fijiensis em folhas de Heliconia psittacorum. Efetuou-se o isolamento do patógeno e, para o teste de patogenicidade, foi utilizada a técnica de inoculação cruzada com os isolados de H. psittacorum e de bananeira (Musa spp.) da cv. Prata Anã. Em ambas as espécies o teste foi positivo. Com o auxílio do microscópio óptico, da literatura disponível e ...

  2. Estudo do papel dos neurônios dopaminérgicos da substância negra no condicionamento de lugar com sacarose e quinino

    OpenAIRE

    Lima, Bernardo Fermino Correia de

    2014-01-01

    Resumo: É ainda controverso se diferentes populações de neurônios dopaminérgicos desempenham um papel na aprendizagem associativa apetitiva e aversiva. No presente trabalho, mostramos que a lesão parcial bilateral da substância negra pars compacta (SNc) de ratos induzida por 1-metil-4-fenil-1,2,3,6-tetrahidropiridina (MPTP, 200 µg/por lado) ou 6-hidroxidopamina (6-OHDA, 3 µg/por lado) prejudica a tarefa de aversão condicionada de lugar, mas não a preferência condicionada de lugar. As expressõ...

  3. Efeitos de sistemas de preparo do solo na erosão e na produtividade da acácia-negra (Acacia mearnsii de Wild..

    Directory of Open Access Journals (Sweden)

    Renato A. Dedecek

    2010-08-01

    Full Text Available Os plantios homogêneos de acácia-negra nem sempre são feitos em solos adequados às exigências da espécie, seja pelo valor da terra ou proximidade da indústria. Diferentes sistemas de preparo podem melhorar as condições do solo, evitar problemas de erosão e diminuir custos de implantação. Em áreas de propriedade da TANAGRO S.A e da SETA S.A., nos municípios de Piratini e Butiá, RS, em dois tipos de solos distintos - Neossolo Litólico e Argissolo Vermelho-Amarelo, foram testados sistemas de preparo do solo com diferentes níveis de movimentação para plantio de acácia-negra: plantio de mudas em covas e plantio após subsolagens com duas, três e cinco hastes e uso de gradagens. Foram avaliados o crescimento em DAP e altura, anualmente, e produção de biomassa aérea no corte raso. Os solos foram caracterizados química e fisicamente em seus horizontes superficiais. Nas plantas, após sete anos, foram coletadas amostras de discos em seis posições no tronco para avaliação das densidades básicas. Preparo do solo com subsolador de cinco hastes apresentou maiores perdas de solo, que foram mensuráveis apenas até 18 meses após o plantio. Essas perdas de solo são extremamente importantes na sustentabilidade da produção do Neossolo Litólico, composto em 80% de calhaus e cascalho. O preparo reduzido do solo, com a abertura de covas manual e mecanicamente para plantio da acácia negra, não diminuiu o crescimento das plantas em ambos os solos estudados. No entanto, o desenvolvimento inicial das plantas de acácia negra, plantadas em sistema de preparo reduzido, foi mais lento (altura e DAP, defasagem que permaneceu até os 24 meses após o plantio.

  4. Manejo de Sigatoka negra (Mycosphaerella Fijiensis var. Difformis Morelet en plátano cv. “Curraré” en San Carlos, Zona Norte

    Directory of Open Access Journals (Sweden)

    Carlos Muñoz Ruiz

    2006-05-01

    Full Text Available Se evaluaron los diferentes productos químicos, utilizados en el control de Sigatoka negra en banano, en el cultivo de plátano, en la zona de Santa Clara de San Carlos. Uno de los principales objetivos fue generar un programa de manejo químico de la enfermedad para la zona de San Carlos, posible de ser transferido a otras zonas plataneras del país; el otro objetivo fue establecer las bases para automatizar las actividades culturales de manejo de plantaciones de musáceas, mediante la creación de un Software para computadora y asequible por internet.

  5. Suplementação de metionina e/ou lisina em rações para juvenis de tambaqui (Colossoma macropomum Cuvier, 1818) Reduction of protein levels and methionine and/or lysine supplementation in diets and their effects in total ammonia nitrogen excretion of tambaqui juveniles (Colossoma macropomum Cuvier, 1818)

    OpenAIRE

    Lian V. Brandão; Manoel Pereira-Filho; Sérgio Fonseca Guimarães; Flávio A. L. da Fonseca

    2009-01-01

    Foi avaliado o efeito da redução dos níveis de proteína e a suplementação de metionina e/ou lisina em rações sobre a excreção de amônia em juvenis de tambaqui (Colossoma macropomum). O experimento foi realizado em delineamento inteiramente casualizado com esquema fatorial de duas entradas: 2 níveis protéicos (25 e 20%) e 4 níveis de inclusão de aminoácidos: a) 0% de suplementação, b) DL-Metionina (3% da PB), c) L-lisina (5% da PB) e d) Dl-Metionina (3% da PB) + L-lisina (5% da PB), com duraçã...

  6. Parâmetros eritrocitários e curva de fragilidade osmótica de Colossoma macropomum (Pisces, Osteichthyes, Mileinae) em cativeiro Red blood cell parameters and osmotic fragility curve of Colossoma macropomum (Pisces, Osteichthyes, Mileinae) in captivity

    OpenAIRE

    Elineide Eugenio Marques; Elianora Gomes de Carvalho; Elvira Maria Guerra Shinnohara; Carla Simone Seibert

    2001-01-01

    A fim de estabelecer valores de referência de certos parâmetros hematológicos e a curva de fragilidade osmótica do sangue de Colossoma macropomum, as amostras de sangue foram coletadas de 38 peixes, provenientes de fazendas do Estado do Tocantins, Brasil. Foram determinados o número de eritrócitos e o conteúdo de hemoglobina e hematócrito. A curva de fragilidade osmótica foi determinada com a incubação dos tubos por 30 minutos a 30ºC, incubadas a 37, 30 e 27ºC por 24 horas e incubadas por 12 ...

  7. Histología de branquias, hígado y riñón de juveniles del pez neotropical Colossoma macropomum (Characiformes, Characidae) expuesto a tres temperaturas Histology of gill, liver and kidney in juvenile fish Colossoma macropomum exposed to three temperatures

    OpenAIRE

    Luz-Marina Rojas; Claunis Mata; Aridays Oliveros; Raquel Salazar-Lugo

    2013-01-01

    Colossoma macropomum es uno de los peces tropicales de agua dulce con mayor éxito en el cultivo en aguas continentales tropicales. Se realizó una evaluación histológica de branquias, hígado y riñón de este pez expuesto a tres temperaturas (T18, T29 y T35ºC). Se utilizaron 18 ejemplares juveniles con índices biométricos de 17.87±7.88cm y 87.69±34.23g. Los análisis histológicos fueron hechos de acuerdo a técnicas previamente descritas. Se encontró que las branquias, el hígado y el riñón de los ...

  8. Efeito do cloreto de sódio sobre as respostas fisiológicas e controle de helmintos monogenóides em tambaqui (Colossoma macropomum) Effect of sodium chloride on physiological responses and monogenean control in tambaqui (Colossoma macropomum)

    OpenAIRE

    Edsandra Campos Chagas; Lucelle Dantas de Araújo; Levy de Carvalho Gomes; José Celso de Oliveira Malta; Angela Maria Bezerra Varella

    2012-01-01

    O objetivo deste trabalho foi avaliar o efeito do sal (NaCl) sobre as respostas fisiológicas e controle de helmintos monogenóides em tambaqui (Colossoma macropomum). Para isso, juvenis de tambaqui (42,38 ± 0,47 g; 13,90 ± 0,06 cm) foram transferidos para tanques de 350L e aclimatados por um período de 24 horas. Os ensaios foram conduzidos utilizando as concentrações de 0, 2, 4, 6 e 8 g de sal comum L-1 de água, nos tempos de exposição de 30, 60 e 120 minutos, com três repetições por tratament...

  9. Excreção de amônia por tambaqui (Colossoma macropomum) de acordo com variações na temperatura da água e massa do peixe Ammonia excretion by tambaqui (Colossoma macropomum) related to water temperature and fish mass

    OpenAIRE

    Rosa Angélica Ismiño-Orbe; Carlos Alberto Rego Monteiro Araujo-Lima; Levy de Carvalho Gomes

    2003-01-01

    A amônia, produto de excreção dos peixes, é tóxica para organismos aquáticos. O objetivo deste trabalho foi quantificar taxas de excreção diária de amônia em tambaqui (Colossoma macropomum), principal espécie criada na Amazônia, que podem variar de acordo com a temperatura da água e a massa dos peixes. As taxas de excreção foram determinadas a cada 2 horas por um período de 24 horas e os resultados analisados por uma regressão linear múltipla. O tambaqui apresentou de dois a cinco picos de at...

  10. Efeito das cores dos tanques, verde clara e marrom escura, na sobrevivência e desenvolvimento de larvas de tambaqui, Colossoma macropomum (Osteichthyes, Serrasalmidae) Effect of light green and dark brown colored tanks on survival rates and development of tambaqui larvae, Colossoma macropomum (Osteichthyes, Serrasalmidae)

    OpenAIRE

    Lucia Helena Sipauba-Tavares; Marcelo Mattos Pedreira

    2001-01-01

    O objetivo deste trabalho foi analisar o efeito da cor dos aquários na sobrevivência e desenvolvimento de larvas de tambaqui Colossoma macropomum, num período de 20 dias. As larvas foram alimentadas “ad libitum” e diariamente foi realizada amostragem de quatro variáveis limnológicas. A temperatura da água oscilou de 24,0 a 27,8 oC no marrom- escuro e de 24,0 a 27,7oC no verde-claro; a concentração de oxigênio dissolvido permaneceu acima de 6,5 mg/L; o pH manteve-se alcalino e a condutividade,...

  11. Fauna parasitária de tambaqui Colossoma macropomum (Characidae cultivado em tanque-rede no estado do Amapá, Amazônia oriental Parasitic fauna of tambaqui Colossoma macropomum(Characidae farmed in cages in the State of Amapá, eastern Amazon

    Directory of Open Access Journals (Sweden)

    Evandro Freitas Santos

    2013-03-01

    Full Text Available O objetivo principal deste trabalho foi estudar a parasitofauna e a relação hospedeiro- parasito em tambaqui Colossoma macropomum cultivados em tanques-rede no Rio Matapi, município de Santana, estado do Amapá, região da Amazônia oriental, Brasil. Foram examinados 60 tambaquis, dos quais 96,7% estavam parasitados por protozoários Ichthyophthirius multifiliis (Ciliophora e Piscinoodinium pillulare (Dinoflagellida, monogenoideas Mymarotheciun boegeri e Anacanthorus spathulatus (Dactylogyridae e sanguessugas Glossiiphonidae gen. sp. (Hirudinea. Os maiores níveis de parasitismo foram causados por protozoários I. multifiliis e P. pillulare e os menores por sanguessugas Glossiiphonidae gen. sp. Porém, os índices de infestação não tiveram efeitos na saúde dos peixes hospedeiros, uma vez que o fator de condição relativo (Kn não foi estatisticamente (pThe purpose of this paper was to evaluate the parasitic fauna and the host-parasite relationship in Colossoma macropomum farmed in cages of Matapi River, municipally of Santana, State of Amapá, in eastern Amazon, Brazil. Of 60 specimens of tambaqui examined, 96.7% were parasitized by protozoans Ichthyophthirius multifiliis (Ciliophora and Piscinoodinium pillulare (Dinoflagellida, monogenoideans Mymarotheciun boegeri and Anacanthorus spathulatus (Dactylogyridae, and leeches Glossiphoniidae gen. sp. (Hirudinea. The higher infestation levels were caused by protozoans I. multifiliis and P. pillulare, while the lower infestation levels were caused by leeches. No effects of parasitic infestation rates on fish health were observed. The relative condition factor (Kn was not correlated with the intensity of parasites found. This was the first record of I. multifiliis and P. pillulare in C. macropomum farmed in cages in the Brazilian Amazon.

  12. Efeito das cores dos tanques, verde clara e marrom escura, na sobrevivência e desenvolvimento de larvas de tambaqui, Colossoma macropomum (Osteichthyes, Serrasalmidae Effect of light green and dark brown colored tanks on survival rates and development of tambaqui larvae, Colossoma macropomum (Osteichthyes, Serrasalmidae

    Directory of Open Access Journals (Sweden)

    Lucia Helena Sipauba-Tavares

    2001-05-01

    Full Text Available O objetivo deste trabalho foi analisar o efeito da cor dos aquários na sobrevivência e desenvolvimento de larvas de tambaqui Colossoma macropomum, num período de 20 dias. As larvas foram alimentadas “ad libitum” e diariamente foi realizada amostragem de quatro variáveis limnológicas. A temperatura da água oscilou de 24,0 a 27,8 oC no marrom- escuro e de 24,0 a 27,7oC no verde-claro; a concentração de oxigênio dissolvido permaneceu acima de 6,5 mg/L; o pH manteve-se alcalino e a condutividade, acima de 30 µS/cm. O tratamento marrom-escuro apresentou sobrevivência média significativamente menor (P The color effect on survival rate and development of tambaqui larvae, Colossoma macropomum, in fish tanks, during a 20 day period, was analyzed. Larvae were fed “ad libitum” and measurements of four limnological variables were conducted daily. Water temperature varied between 24 to 27.8C and 24.0 to 27.7C in the dark brown and light green colored tanks, respectively. Dissolved oxygen level remained over 6.5 mg/L, pH was alkaline and water conductivity higher than 30 µS/cm. The dark brown treatment displayed significantly (P < 0.05 lower survival rate compared to treatment with light green. Identical effect, however, was not reported with average weight, biomass and larvae total length. Results showed that tank color influences larvae survival rates, where the light green color makes it easier for the larvae to visualize the prey

  13. Direitos sexuais, direitos reprodutivos: concepções de mulheres negras e brancas sobre liberdade Sexual and reproductive rights: the conceptions of black and white women regarding freedom

    Directory of Open Access Journals (Sweden)

    Raquel Souzas

    2007-08-01

    Full Text Available A saúde reprodutiva relaciona-se ao usufruto da liberdade intrínseca aos direitos sexuais e reprodutivos. A questão central, neste artigo, é como a noção de liberdade se articula à condição social, de gênero, raça/etnia, com o intuito de investigar diferenças de gênero e de raça nas questões reprodutivas de mulheres negras e brancas, em relação à concepção de liberdade. A pesquisa é de natureza qualitativa e aborda questões reprodutivas de mulheres, a partir de um recorte de gênero e raça. Foram entrevistadas 36 mulheres, autoclassificadas brancas e negras (pretas e pardas, em união conjugal há, pelo menos, um ano. Os discursos foram analisados articulando-se raça/etnia e diferentes níveis de escolaridade. No conjunto, observa-se que as condições de vida e saúde reprodutiva de mulheres negras e brancas diferenciam-se em razão das condições socioeconômicas e culturais. Comparativamente, os discursos dos dois grupos podem ser interpretados em dois níveis característicos, da vida privada e do espaço público: enquanto mulheres brancas focam a defasagem das mulheres, no exercício eqüitativo da liberdade em relação aos homens, mas destacam conquistas no mundo do trabalho, mulheres negras pensam a liberdade mais circunscrita à possibilidade de vivência democrática da conjugalidade. As diferenças de discurso em relação à liberdade podem estar relacionadas tanto à questão do racismo no Brasil, historicamente vivenciado por mulheres negras no cotidiano, como às questões especificamente culturais dos dois grupos estudados.Reproductive health is related to the enjoyment of freedom that is intrinsic to sexual and reproductive rights. The core issue, in this article, is how the notion of freedom articulates itself to the social condition of gender, race and ethnicity. To investigate gender and race differences in reproductive issues of black and white women regarding the conception of freedom. The research

  14. Genetic variability of wild and captivity populations of Colossoma macropomum (Cuvier, 1818 - doi: 10.4025/actascibiolsci.v34i2.7149

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    Vera Maria Fonseca de Almeida-Val

    2012-03-01

    Full Text Available Tambaqui (Colossoma macropomum is among the most important fish species of the Amazon and one of the most cultivated in Brazil. In the present work we have evaluated the genetic variability of wild and captivity populations of C. macropomum. Enzymatic markers were used to estimate the genetic variability of 41 specimens from a wild group; and 30, 33 and 45 from three captivity groups, which came from Pentecostes (Ceará State, Jaboticabal (São Paulo State and Itacoatiara (Amazonas State, respectively. Nine isoenzymic systems were used to evaluate the genetic variability of these populations. Using zimogram data we obtained the polymorphism level, allele number, allelic frequency, observed and expected heterozigosity, Wright F statistics (FIS, FST, genetic distance, level of similarity and group analysis. The isoenzymic data showed that, from the nine systems, six presented polymorphic loci (Fbp-2, G6pdh-2, G6pdh-3, Pgi-1, Pgi-2 and Pgm-1. The populations from Pentecostes and Jaboticabal presented loss of genetic variability and low heterozigosity, compared to the wild population and to the artificial population acquired at Itacoatiara fish farm. Based on these results and on fish farmer information we could consider the population from Itacoatiara as recently derived from a wild population. Concluding, we suggest that the artificial populations of tambaqui, which contain animals originated from this funding population at Pentecostes, should be renewed with the introduction of a new group of individuals with genetic variability equivalent to the wild population.

  15. Genotoxic and hematological parameters in Colossoma macropomum (Pisces, Serrasalmidae) as biomarkers for environmental impact assessment in a protected area in northeastern Brazil.

    Science.gov (United States)

    Fortes Carvalho Neta, Raimunda Nonata; Pinheiro Sousa, Débora Batista; de Macêdo Sobrinho, Inaldo Carvalho; Yarbrough Horton, Emily; da Silva de Almeida, Zafira; Tchaicka, Lígia; de Sousa, Alana Lislea

    2015-10-01

    Genotoxic and hematological parameters in tambaqui (Colossoma macropomum), a native freshwater fish, were used as biomarkers to assess exposure to environmental stressors within the Maracanã Protected Area of Maranhão State, Brazil. Fish were sampled at two sites-Serena Lagoon (control) and Ambude River-on four occasions (dry and rainy season), and biometric data (length and weight) recorded and blood collected from all fish for analysis. Erythrocyte indices-mean corpuscular volume, mean corpuscular hemoglobin, and mean corpuscular hemoglobin concentration-were calculated. Blood samples were stained with Giemsa and acridine orange, and microscopically examined for micronuclei and morphological nuclear abnormalities. Micronuclei were observed in fish from both sites, although the frequency was significantly higher in fish from the Ambude River and morphological nuclear abnormalities were only observed in fish from the Ambude River. More morphological nuclear abnormalities and a larger number of micronuclei were observed in erythrocytes stained with acridine orange compared with those stained with Giemsa. On average, erythrocyte indices were lower in fish from the Ambude River than from the Serena Lagoon. The results confirm that genotoxic and hematological parameters in C. macropomum can be used as indicators of environmental health and could be valuable tools for monitoring environmental conditions within protected areas. PMID:26062456

  16. Characterization of acetylcholinesterase from the brain of the Amazonian tambaqui (Colossoma macropomum) and in vitro effect of organophosphorus and carbamate pesticides.

    Science.gov (United States)

    Assis, Caio Rodrigo Dias; Castro, Patrícia Fernandes; Amaral, Ian Porto Gurgel; Carvalho, Elba Verônica Matoso Maciel; Carvalho, Luiz Bezerra; Bezerra, Ranilson Souza

    2010-10-01

    In the present study, acetylcholinesterase (AChE) from the brain of the Amazonian fish tambaqui (Colossoma macropomum) was partially characterized and its activity was assayed in the presence of five organophosphates (dichlorvos, diazinon, chlorpyrifos, and tetraethyl pyrophosphate [TEPP]) and two carbamates (carbaryl and carbofuran) insecticides. Optimal pH and temperature were 7.0 to 8.0 and 45°C, respectively. The enzyme retained approximately 70% of activity after incubation at 50°C for 30 min. The insecticide concentration capable of inhibiting half of the enzyme activity (IC50) for dichlorvos, chlorpyrifos, and TEPP were calculated as 0.04 µmol/L, 7.6 µmol/L, and 3.7 µmol/L, respectively. Diazinon and temephos did not inhibit the enzyme. The IC50 values for carbaryl and carbofuran were estimated as 33.8 µmol/L and 0.92 µmol/L, respectively. These results suggest that AChE from the juvenile C. macropomum brain could be used as an alternative biocomponent of organophosphorus and carbamate biosensors in routine pesticide screening in the environment. PMID:20872688

  17. INFLUÊNCIA DO FOTOPERÍODO EMERAL SOBRE CARCTERISTICAS BROMATOLÓGICAS DA CARCAÇA DE JUVENIS DE TAMBAQUI (Colossoma macropomum

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    PEDRO PIERRO MENDONÇA

    2011-06-01

    Full Text Available The aim of this study was to evaluate the influence of ahemeral photoperiod on the chemical composition of the carcasses of tambaqui (Colossoma macropomum. The experiment was conducted using 1 90 fish with average weight of 11.01 ± 2.08g and total lenght of 7.8± 0.18cm,stored in sixteen bowls of 56 liters of water with daily renewal of 40-times volume. The water temperarature was maintained at 29.1 ± 0.41°C and the stocking rate was equivalent to 2.75g/L. All tanks had constant aeration. Ahemeral photoperiods were maintained with the aid of timers. The following treatments were used: T1 = 6 hours of light, T2= 1 2 hours of light, T3= 1 8 hours of light and T4= 24 hours of light with four replications each. The juveniles were fed twice a day with commercial extruded feed (28% crude protein. The experiment lasted 64 days and the chemical composition of eviscerated and sheddedcarcasses were analysed at the beginning, at 32 days and at the end of it for the evaluation of crude protein, ether extract, ash and non nitrogenous extract in dry matter and in natural matter. Statistical analysis of variables was performed with the aid of SAEG application, version 9.1. For performing analysis of variance, Pearson correlationsand regressions were used. There was no effect of ahemeral photoperiods (p<0.05 in variables.

  18. Variación mensual del índice gonadosomatico de Colossoma macropomum relacionado a factores ambientales en Cañas, Costa Rica.

    Directory of Open Access Journals (Sweden)

    Jorge Boza

    2016-03-01

    Full Text Available Con el fin de determinar la variación mensual en el índice gonadosomático de Colossoma macropomum en estanques, se tomaron muestras mensuales de 10 individuos desde setiembre de 1993 hasta setiembre de 1994. Se midieron además, durante todo el período experimental los siguientes parámetros ambientales: precipitación, temperatura del agua y oxígeno disuelto. El índice gonadosomático (IGS en las hembras presentó un rápido incremento de abril a mayo, permaneciendo alto de junio hasta agosto, decreciendo de setiembre hasta noviembre y mostrando los valores más bajos de diciembre hasta marzo. Esto indica que el desarrollo gonadal inicia un mes después del inicio de las lluvias (finales de abril y que la regresión gonadal esta relacionada con la finalización de esta estación (noviembre, manteniéndose en reposo durante la estación seca (noviembre-marzo. Los valores en el índice gonadosomático para machos, muestran una tendencia similar al de las hembras. Para los otros parámetros obtenidos (temperatura del agua y oxígeno disuelto no se observaron variaciones estacionales que pudieran inducir un cambio en el índice gonadosomático, ya que los valores presentan variaciones muy pequeñas.

  19. Roundup® exposure promotes gills and liver impairments, DNA damage and inhibition of brain cholinergic activity in the Amazon teleost fish Colossoma macropomum.

    Science.gov (United States)

    Braz-Mota, Susana; Sadauskas-Henrique, Helen; Duarte, Rafael M; Val, Adalberto L; Almeida-Val, Vera M F

    2015-09-01

    Roundup Original® (RD) is a glyphosate-based herbicide used to control weeds in agriculture. Contamination of Amazon waters has increased as a consequence of anthropogenic pressure, including the use of herbicides as RD. The central goal of this study was to evaluate the toxic effects of RD on juveniles of tambaqui (Colossoma macropomum). Our findings show that biomarkers in tambaqui are organ specific and dependent on RD concentration. Alterations in gills structural and respiratory epithelium were followed by changes in hematological parameters such as concentration of hemoglobin, particularly in fish exposed to the higher concentration tested (75% of RD LC50 96 h). In addition, both RD concentrations affected the biotransformation process in gills of tambaqui negatively. Instead, liver responses suggest that a production of reactive oxygen species (ROS) occurred in fish exposed to RD, particularly in the animals exposed to 75% RD, as seen by imbalances in biotransformation and antioxidant systems. The increased DNA damage observed in red blood cells of tambaqui exposed to RD is in agreement with this hypothesis. Finally, both tested sub-lethal concentrations of RD markedly inhibited the cholinesterase activity in fish brain. Thus, we can suggest that RD is potentially toxic to tambaqui and possibly to other tropical fish species. PMID:25898390

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

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    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.

  1. Differential Expression of Myogenic Regulatory Factor Genes in the Skeletal Muscles of Tambaqui Colossoma macropomum (Cuvier 1818) from Amazonian Black and Clear Water.

    Science.gov (United States)

    Alves-Costa, F A; Barbosa, C M; Aguiar, R C M; Mareco, E A; Dal-Pai-Silva, M

    2013-01-01

    Hypothesizing that the Amazonian water system differences would affect the expression of muscle growth-related genes in juvenile tambaqui Colossoma macropomum (Cuvier 1818), this study aimed to analyze the morphometric data and expression of myogenic regulatory factors (MRFs) in the white and red muscle from tambaqui obtained from clear and black Amazonian water systems. All of the MRF transcript levels (myod, myf5, myogenin, and mrf4) were significantly lower in the red muscle from black water fish in comparison to clear water fish. However, in white muscle, only the myod transcript level was significantly decreased in the black water tambaqui. The changes in MRFs gene expression in muscle fibers of tambaqui from black water system provide relevant information about the environmental influence as that of water systems on gene expression of muscle growth related genes in the C. macropomum. Our results showed that the physical and chemical water characteristics change the expression of genes that promote muscle growth, and these results may be also widely applicable to future projects that aim to enhance muscle growth in fish that are of substantial interest to the aquaculture. PMID:24350238

  2. Cambios de los receptores de benzodiazepinas en la sustancia negra como consecuencia de lesión del territorio de la arteria cerebral media en un modelo experimental de isquemia con reperfusión en ratas

    Directory of Open Access Journals (Sweden)

    Hernán J. Pimienta J.

    2005-03-01

    Full Text Available Se han demostrado cambios remotos o exofocales en la sustancia negra, en modelos experimentales de isquemia focal, con compromiso de la corteza cerebral y el estriado dorsolateral.  Se ha propuesto que estos cambios obedecen al desbalance entre las actividades excitatorias e inhibitoria.

  3. A escravidão da criança negra e a Lei do Ventre Livre (1871/The slavery of black children education and Rio Branco Law (1871

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    Claudia Monteiro da Rocha Ramos

    2008-06-01

    Full Text Available RAMOS, C. M. R. A escravidão da criança negra e a Lei do Ventre Livre (1871. 215fl. 2008. Dissertação (Mestrado em Educação – Faculdade de Educação, Universidade Estadual de Campinas, Campinas, 2008.

  4. Proyecto de forestación con carrasca (Quercus ilex ssp. Rotundifolia) micorrizada con trufa negra (Tuber melanosporum Vitt.) en el término municipal de San Agustín

    OpenAIRE

    MAYO SANZ, ELOY

    2012-01-01

    Mayo Sanz, E. (2011). Proyecto de forestación con carrasca (Quercus ilex ssp. Rotundifolia) micorrizada con trufa negra (Tuber melanosporum Vitt.) en el término municipal de San Agustín. http://hdl.handle.net/10251/14231.

  5. Evaluación de la tasa de consumo de oxígeno de Colossoma macropomum en relación al peso corporal y temperatura del agua

    OpenAIRE

    Dennis Tomalá; Johnny Chavarría; Beatriz E.A Escobar

    2014-01-01

    Colossoma macropomum es una especie de la región amazónica perteneciente a la familia Characidae, la de mayor diversidad de peces de agua dulce. A nivel de laboratorio, se determinó la tasa de consumo de oxígeno (CO) en metabolismo de rutina de C. macropomum a diferentes pesos corporales: 40, 60, 90, 140 y 250 g (expresados por unidad de masa corporal) y temperatura del agua de 21, 26 y 31°C. El experimento se diseñó completamente al azar en arreglo factorial (5x3x3), utilizando un respirómet...

  6. A fauna de parasitas do tambaqui, Colossoma macropomum (Cuvier, 1818) (Characiformes: Characidae) do médio rio Solimões, Estado do Amazonas (AM) e do baixo rio Amazonas, Estado do Pará (PA), e seu potencial como indicadores biológicos The fauna of parasites of the tambaqui, Colossoma macropomum (Cuvier, 1818) (Characiformes: Characidae) from middle Solimões River and lower Amazonas River and their potential as biological indicators

    OpenAIRE

    Christina Fischer; José Celso de Oliveira Malta; Angela Maria Bezerra Varella

    2003-01-01

    Foram examinados brânquias, fossas nasais e intestinos de tambaquis (Colossoma macropomum) capturados em duas localidades na Amazônia, próximas aos municípios de Tefé/Coari, no médio rio Solimões, Estado do Amazonas e de Santarém no baixo rio Amazonas, Estado do Pará. Nove espécies de parasitas foram encontradas: três da classe Monogenoidea; Anacanthorus spathulatus, Linguadactyloides brinkmanni e Notozothecium sp.; uma de Trematoda da família Paramphistomidae; uma do filo Acanthocephala, Neo...

  7. Mineralogia e proveniência das areias negras de Iriri - ES Mineralogy and provenance of black sands from Iriri - ES

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    Alexandre de Oliveira Chaves

    2011-12-01

    Full Text Available As areias negras das praias de Iriri (ES apresentam uma ampla variedade no seu conteúdo mineralógico. A partir de propriedades ópticas e morfológicas e das composições químicas de grãos individuais, foi verificado que os principais minerais são quartzo e ilmenita, constituindo, respectivamente, 45% e 35% do volume do material investigado. Na porção restante, foram identificados os minerais pesados magnetita, monazita, zircão, cianita, sillimanita, granadas almandina e grossulária, espinélio, actinolita, clorita, rutilo e augita, além de aragonita. Levando-se em conta a geologia regional, tanto da área continental, quanto da bacia sedimentar, que envolve a região de Iriri, a análise de proveniência sugere que: a o quartzo seja oriundo dos paragnaisses regionais, dos granitóides pré a sin-colisionais e dos granulitos costeiros; b a associação dos minerais ilmenita, magnetita, augita e chamosita seja proveniente de basaltos toleíticos amigdalóides mesozóicos da bacia; c a grossulária, o espinélio e a actinolita provenham de ortoanfibolitos e rochas cálcio-silicáticas; d a almandina tenha origem relacionada não só aos paragnaisses como também aos granitóides peraluminosos sin-colisionais regionais e granulitos costeiros, sendo que estes últimos também podem ter sido a rocha-fonte do rutilo; e a cianita seja originária do terreno Cabo Frio; f a sillimanita provenha dos sillimanita-granada-biotita gnaisses paraderivados situados próximo à costa do Espírito Santo; g um primeiro subtipo de zircões juntamente com as monazitas sejam derivados das suítes pós-colisonais G4 e G5 e um segundo grupo de zircões representem cristais do embasamento paleoproterozóico distante da área de deposição; h a aragonita possua uma origem biogênica, sendo derivada de fragmentos de conchas de moluscos ou corais marinhos.Black sands from the Iriri beach (ES present a wide variety in their mineral content. From the optical and

  8. “Eu nasci branquinha”: Construção da identidade negra no espaço escolar

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    Priscila da Cunha Bastos

    2015-08-01

    cidade do Rio de Janeiro e é representativo da condição em que as crianças negras são formadas e do campo no qual elas se constituem como sujeitos. Através de observação de campo produz-se uma análise que considera raça e gênero construções sociais que organizam a experiência social e categorias que contribuem para o trabalho de reconhecimento das desigualdades de tratamento e oportunidades na escola e na sociedade brasileira. O estudo pretende oferecer elementos para se pensar em possíveis reformulações curriculares e práticas que contribuam para a superação da discriminação racial e de gênero, afirmando identidades, assim como incentivar estudos que possam identificar os impactos dessas relações de discriminação no cotidiano escolar e seus efeitos na produção e reprodução das desigualdades educacionais.

  9. Direitos sexuais, direitos reprodutivos: concepções de mulheres negras e brancas sobre liberdade Sexual and reproductive rights: the conceptions of black and white women regarding freedom

    OpenAIRE

    Raquel Souzas; Augusta Thereza de Alvarenga

    2007-01-01

    A saúde reprodutiva relaciona-se ao usufruto da liberdade intrínseca aos direitos sexuais e reprodutivos. A questão central, neste artigo, é como a noção de liberdade se articula à condição social, de gênero, raça/etnia, com o intuito de investigar diferenças de gênero e de raça nas questões reprodutivas de mulheres negras e brancas, em relação à concepção de liberdade. A pesquisa é de natureza qualitativa e aborda questões reprodutivas de mulheres, a partir de um recorte de gênero e raça. Fo...

  10. Detecção de fungos patogênicos em sementes de acácia-negra (Acacia mearnsii De Wild).

    OpenAIRE

    Flávia Elise Meneghini dos Santos; Rita de Cassia Sobrosa; Ivan Francisco D. Costa; Maisa Pimentel Martins Corder

    2009-01-01

    A presença de fungos pode reduzir a capacidade germinativa de um lote de sementes, causar a morte de plântulas ou transmitir doenças para plantas adultas. É necessário conhecer os agentes, as causas e as conseqüências decorrentes da contaminação por fungos patogênicos. Desse modo, o presente estudo teve como objetivo identificar os fungos associados às sementes de Acacia mearnsii De Wild, armazenadas a 5°C, por um período de 12 meses. Foram  utilizadas  sementes  de  acácia- -negra oriunda...

  11. Cosmic ray observations at Chacaltaya and Cerro la Negra combined with the Pierre Auger and Milagro observatories: GRBs and search for cosmic ray correlations

    International Nuclear Information System (INIS)

    We consider the possibility to search for cosmic ray phenomena time correlated among distant experiments that are currently running in the world. In particular we consider the correlations of events detected by four experiments: between Milagro, operating in USA, and Cerro La Negra Cosmic Ray Laboratory, under construction in Mexico, and between Chacaltaya, in Bolivia, and Auger Observatory, under construction in Argentina. Almost complete sky coverage with fairly uniform celestial exposure of the northern and the southern hemispheres by the above four experiments at the same time could provide important information on astrophysical phenomena. Search for Gamma Ray Bursts and search for non random coincidence between these experiments seem to be feasible under an international extensive air shower joint experiment with the main goal to watch GRBs and other astrophysical phenomena

  12. Acessibilidade à atenção básica a famílias negras em bairro popular de Salvador, Brasil

    OpenAIRE

    Leny Alves Bomfim Trad; Marcelo Eduardo Pfeiffer Castellanos; Maria Clara da Silva Guimarães

    2012-01-01

    OBJETIVO: Analisar a acessibilidade de famílias negras de bairro popular aos serviços de atenção básica à saúde. MÉTODOS: Estudo etnográfico, ancorado na antropologia de base interpretativa, realizado com 18 famílias selecionadas de um bairro popular de Salvador, BA, no período de dois anos. Os critérios de inclusão foram residência no bairro e autoclassificação como negros. A análise se baseou na antropologia interpretativa e considerou as categorias: autorreferência étnico-racial; experiênc...

  13. Aspectos hidro-limnológicos en las ciénagas de Chucuri y Aguas Negras (Magdalena Medio, Colombia durante un ciclo anual

    Directory of Open Access Journals (Sweden)

    García Lozano Luis Carlos

    1989-06-01

    Full Text Available

    El presente estudio analiza características hrdrológicas-limnológicas de la estructura y funcionamiento de las ciénagas de Chucuri y Aguas Negras localizadas en la planicie aluvial del Valle Medio del rio Magdalena. Se basa en seguimientos bimensuales en diez estaciones de muestreo, durante el ciclo anual: abril de 1983 a marzo de 1984. Se resalta la presencia de dos estadios definidos asociados al régimen de inundación y sequia con rasgos característicos en la comunidad fitoplanctónica: abundancia, diversidad, distribución espacio-temporal y productividad primaria: en los parámetros físico-químicos: oxígeno disuelto, temperatura, conductividad, pH y transparencia del agua: y en los principales nutrientes: fosfatos, sulfatos, nitratos y amonio.

  14. Aspectos hidro-limnologicos en las ciénagas de chucuri y aguas negras (Magdalena medio, Colombia durante un ciclo anual

    Directory of Open Access Journals (Sweden)

    García Lozano Luis Carlos

    1989-06-01

    Full Text Available El presente estudio analiza caracteristicas hídrológicas-limnológicas de la estructura y funcionamiento de las ciénagas de Chucuri y Aguas Negras localizadas en la planicie aluvial del Valle Medio del río Magdalena. Se basa en seguimientos bimensuales en diez estaciones de muestreo. durante el ciclo anual: abril de 1983 a marzo de 1984. Se resalta la presencia de dos estadios definidos asociados al régimen de inundación y sequía con rasgos caracteristicos en la comunidad fitoplanctónica: abundancia. diversidad. distribución espacio-temporal y productividad primaria; en los parámetros fisico-químicos: oxígeno disuelto. temperatura. conductividad. pH y transparencia del agua; y en los principales nutrientes: fosfatos. sulfatos. nitratos y amonio.

  15. ANÁLISE DA DEFORMAÇÃO RESIDUAL LONGITUDINAL E SUA RELAÇÃO COM PROPRIEDADES TECNOLÓGICAS DA MADEIRA DE ACÁCIA-NEGRA

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    Rafael de Avila Delucis

    2015-06-01

    Full Text Available RESUMOA madeira de acácia-negra tem sido utilizada em nichos que conferem pouco valor agregado à esse material. Diante disso, este trabalho teve como objetivo analisar as deformações residuais longitudinais (DRL e suas relações com propriedades da madeira de Acacia mearnsii. Para tanto, foram selecionadas 60 árvores em plantios com idades distintas (4 e 7 anos no Município de Piratini, RS. As características de crescimento avaliadas consistiram em diâmetro à altura do peito (1,3 m; DAP, espessura de casca (EP e altura comercial (h. As propriedades físicas avaliadas massa específica básica (ρ e teorde umidade à base seca (Tu. Já o tempo de propagação de onda ultrassonora foi determinado em conformidade com o procedimento NBR 15521. As propriedades mecânicas foram o módulo de elasticidade dinâmico (Ed, bem como as propriedades descritas no procedimento normativo D143-94, através dos ensaios de flexão estática, compressão paralela às fibras e Dureza Janka. ADRLesuas relações com as propriedades da madeira mostraram-se semelhantes aos resultados encontrados na literatura para a madeira de espécies do gênero Eucalyptus. No entanto, em magnitude, tais níveis se mostraram sensivelmente menores, conferindo à madeira de acácia-negra no que se refere a esse parâmetro de qualidade, indicação para a confecção de produtos sólidos.

  16. Similarities in the dolomitization of upper Miocene reef complexes in Mallorca and the Las Negras areas, Spain: Possible evidence for a Mediterranean dolomitizing event during the Messinian

    Energy Technology Data Exchange (ETDEWEB)

    Oswald, E.J.; Meyers, W.J. (SUNY, Stony Brook, NY (United States)); Franseen, E.K. (Univ. of Kansas, Lawrence (United States))

    1991-03-01

    Reef complexes in the Las Negras area and the island of Mallorca, over 600 km to the northeast, contain dolomite with remarkably similar stratigraphic distribution and petrographic characteristics. In both reef complexes dolomite occurs as 5-50 {mu}m euhedral cements and microcrystalline replacement of red-algal fragments and muds. In addition, anhedral, moldic-zoned dolomite cements (5-20 {mu}m) are abundant in the youngest reefs of both areas. All inter-reefal erosional surfaces are cross-cut by dolomite cements. Distribution of dolomite within the reefal sequences is controlled by (1) proximity to the youngest reef margin. Dolomite abundances decrease from 100% to 0% over a 10 km transect into the platform interior in Mallorca. Stratigraphic and petrographic timing support a dolomitization event following exposure of the reefs, during initial deposition of the onlapping Messinian sequence in Mallorca, and before Pliocene deposition in Las Negras. In both areas, dolomitization took place as a Messinian transgression covered the reefs. Evidence for multiple dolomitization events has not been found. Mallorcan dolomites have heavy stable isotopes suggesting saline dolomitizing fluids. One hypothesis for dolomitization invokes brines associated with the deposition of extensive Messinian basinal evaporites. An early Messinian evaporitic lowstand could concentrate marine brines, and with the ensuing transgression bring them in contact with CaCo{sub 3} platforms, dolomitizing them. The similar styles and timing of dolomitization in these two distinct and distant reef settings suggest that dolomitization of late Miocene reefs around the western Mediterranean may have been genetically related to the Messinian salinity crisis.

  17. Doença de Tay-Sachs em criança de raça negra Tay-Sachs disease in a Negro child

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    Sérgio Rosemberg

    1970-12-01

    Full Text Available É relatado um caso de doença de Tay-Sachs em criança da raça negra. O encontro desta entidade em indivíduos não judeus é bastante raro, sendo este o quinto caso descrito em criança negra. Os autores estudam alguns aspectos genéticos, chegando à conclusão de que o cálculo da freqüência do gene mutante é impossível devido ao pequeno número de casos e ao fato de que não há estimativas seguras quanto à taxa de nascimento de indivíduos negros na população, Em que pese o fato de o diagnóstico se assentar em bases puramente clínicas e anatômicas, prescindindo os autores de exames bioquímicos específicos, os dados apresentados são congruentes com os casos clássicos descritos na literatura.A case of Tay-Sachs diseases in a Negro child is reported. The occurrence of this disease in non-Jewish individuals is very rare and this is the fifth case of a Negro-child reported in the litterature. Some genetical aspects are studied and the authors conclude that the frequency calculation of the mutant gene is impossible due to the small number of cases and to the fact that there is reliable information regarding the rate of birth of Negro individuals in the general population. The diagnosis was based on ophtalmological and clinical data. No specific biochemical tests were performed but the data obtained are congruent with other cases reported in the litterature.

  18. Gerenciamento Adaptativo do SAI de Acácia Negra: uma abordagem sob a ótica da auto-organização sustentável

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    Keitiline Ramos Viacava

    2015-03-01

    Full Text Available Com o surgimento do conceito de Gerenciamento Florestal Sustentável (GFS, as agroindústrias florestais vêm sendo pressionadas a tomar decisões baseadas em princípios de sustentabilidade, impulsionando todos os demais elos da cadeia à certificação. No Brasil acontece um processo que espelha este momento no Sistema Agroindustrial de Acácia Negra. Isso ocorre, entretanto, em um contexto complexo, implicando decisões ambíguas e arriscadas no âmbito dos ecossistemas florestais. Assim, propõe-se a seguinte questão: quais ações estratégicas estão sendo adotadas pelos produtores florestais e como elas se relacionam com os riscos na gestão do SAI de Acácia Negra? O objetivo é analisar o processo de desenvolvimento e implementação de ações estratégicas capazes de promover ou desencorajar a auto-organização sustentável do sistema (i.e. certificação florestal. A fundamentação teórica inicia-se com uma perspectiva sistêmica orientada ao estudo das organizações e estratégias sustentáveis. Em seguida, integram-se discussões mais especificamente relacionadas às decisões, estratégias e riscos no âmbito da propriedade rural. Como metodologia incorpora-se a Post-normal science, com enfoque qualitativo. Como resultado, identifica-se que as ações estratégicas adotadas pelos produtores florestais estão dialogicamente relacionadas aos riscos, podendo exercer influências complementares, concorrentes e até antagônicas.

  19. Desempenho produtivo de juvenis de tambaqui (Colossoma macropomum Cuvier, 1818 alimentados com rações contendo farinha de crueira de mandioca (Manihot esculenta, Crantz em substituição ao milho (Zea mays Performance of juvenile tambaqui (Colossoma macropomum Cuvier, 1818 fed diets containing crueira manioc flour (Manihot esculenta, Crantz in replacement of corn (Zea mays

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    Geraldo Pereira Pereira Junior

    2013-06-01

    Full Text Available O objetivo deste estudo foi avaliar o desempenho produtivo de juvenis de tambaqui (Colossoma macropomum, alimentados com níveis crescentes de farinha de crueira de mandioca, Manihot esculenta (0%, 20%, 40%, 60%, 80%, 100%, como substituto do milho (Zea mays. Os peixes (peso médio inicial de 6,6 ± 0,1 g foram distribuídos aleatoriamente em 24 grupos (20 peixes/grupo e alimentados com as dietas experimentais em quatro repetições para avaliação da performance de crescimento, eficiência alimentar, composição corporal e os custos de produção. As performances de crescimento não foram afetados pelos tratamentos. O teor de lipídio no músculo foi diferentemente significativo em peixes alimentados com 40% e 100% em relação aos outros tratamentos. O custo de produção de milho diminuiu linearmente com a substituição. O valor da dieta diminuiu de R $ 1,43 kg-1 a R $ 1,21 kg-1 e o peixe de R $ 1,54 kg-1 a R $ 1,30 peixe kg-1. Concluiu-se que o milho pode ser totalmente substituído por farinha de crueira de mandioca na dieta de juvenil de tambaqui, sem prejudicar o seu desempenho.The main objective of this study was to evaluate the productive performance of young tambaqui (Colossoma macropum, fed with increasing levels of cassava flour, Manihot esculenta (0%, 20%, 40%, 60%, 80%, 100%, as corn (Zea mays replacement. Fish (initial body weight 6.6 ± 0.1 g were randomly distributed in 24 groups (20 fish/group with four replications. They were fed with the experimental diets for evaluation of growth performances, feed utilization, body composition and production costs. Growth performances were not affected by the dietary treatments. Lipid content in muscle were significant different in fish fed 40% and 100% substitution when compared to the other treatments. The production cost decreased linearly with corn substitution. Diet decreased from R$ 1.43 kg-1 to R$ 1.21 kg-1 and fish production cost from R$ 1.54 kg-1 to R$ 1.30 kg-1 fish. It was

  20. Biochemical and behavioral responses of the Amazonian fish Colossoma macropomum to crude oil: the effect of oil layer on water surface.

    Science.gov (United States)

    Kochhann, Daiani; Meyersieck Jardim, Manoela; Valdez Domingos, Fabíola Xochilt; Val, Adalberto Luis

    2015-01-01

    The largest Brazilian terrestrial province of petroleum mining is located at the margins of Urucu River, Amazonas. Mined crude oil is transported along 400 km across Solimões River to be refined in Manaus. Thus, the main goal of this study was to evaluate the effects of crude oil exposure on biochemical, physiological and behavioral parameters of juveniles of the Amazonian fish tambaqui (Colossoma macropomum). The toxicity of water-soluble and insoluble oil fractions and the influence of a layer formed by the oil on the water surface from low and high concentrations of crude oil were analyzed. The results showed a strong physical effect of oil at the water surface and a significant effect on fish behavior. Swimming time and response to alarm substance decreased when fish was exposed for just one day to water insoluble fraction, and remain lower after 30 days of exposure, compared to control. Chronic exposure to water insoluble fraction of the inert oil also affected these two parameters. Critical swimming velocity decreased in fish exposed to both crude and inert oil water insoluble fraction. These reductions are possibly related to a decrease in aerobic capacity. Only exposure to high concentrations of petroleum water-soluble fractions induced transient alterations of the analyzed parameters. The exposure of fish to low and high concentrations of water insoluble fraction of Urucu oil caused a reduction of responses to alarm substance, spontaneous swimming activity and swimming capacity (Ucrit), decreased activity of acetylcholinesterase, and increased activity of alkaline phosphatase. Severe hypertrophy of lamellar epithelium and extensive lamellar fusion of the gills were also observed. Overall, these results show significant behavioral and physiological changes caused by the oil layer on the water surface, which means that toxicity of petroleum produced by its chemical components is, in fact, in this fish species, enhanced by the presence of an oil phase as a

  1. Utilización de la proteína dietaría por alevinos de la gamitana, Colossoma macropomum, alimentados con dietas isocalóricas

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    Félix Walter Gutiérrez

    2011-05-01

    Full Text Available Un experimento fue conducido para evaluar los efectos de cinco niveles de proteína (25,27, 29, 31 y 33% sobre el comportamiento productivo de alevinos de la gamitana, Colossoma macropomum Cuvier 1818, alimentados con dietas isocalóricas (2,7 kcal de ED/g. Los parámetros medidos fueron ganancia de peso (GP, conversión alimenticia (CA, proteína retenida (PR, razón de eficiencia proteica (REP y energía retenida (ER. En la preparación de las dietas experimentales se utilizaron como fuentes de proteína harina de anchoveta y harina de torta de soya y como fuentes de energía maíz amarillo duro, subproducto de trigo y aceite de pescado. Se encontraron diferencias significativas (P<0,05 entre tratamientos para los parámetros GP, PR, REP y ER. No se encontraron diferencias significativas para la CA. Los mejores rendimientos fueron obtenidos cuando las gamitanas fueron alimentadas con niveles dietarios de 25, 27 y 33% de proteína cruda. También se encontró que a medida que se elevó el nivel de proteína de la dieta, la REP decreció significativamente. Tomando en cuenta el costo de la proteína en la dieta, se concluye que la alimentación de la gamitana con niveles dietarios de 25 ó 27% de proteína cruda y 2,7 kcal de ED/g, garantizarán su exitoso crecimiento.

  2. Effects of copper and cadmium on ion transport and gill metal binding in the Amazonian teleost tambaqui (Colossoma macropomum) in extremely soft water.

    Science.gov (United States)

    Matsuo, Aline Y O; Wood, Chris M; Val, Adalberto L

    2005-09-30

    Metal toxicity in fish is expected to be most severe in soft waters because of the low availability of cations (particularly Ca(2+)) to out-compete the metal forms for binding sites on the gills. Natural waters in the Amazon basin are typically soft due to regional geochemistry, but few studies have focused on metal toxicity in fish native to the basin. We assessed the ionoregulatory effects of waterborne copper (Cu) and cadmium (Cd) on tambaqui (Colossoma macropomum) in extremely soft water (10 micromoll(-1) Ca(2+)). Tambaqui had a very high tolerance to Cu (50-400 microgl(-1)), as indicated by a complete lack of inhibition of Na(+) uptake and an ability to gradually recover over 6h from elevated diffusive Na(+) losses caused by Cu. The insensitivity of active Na(+) influx to Cu further supports the notion that Amazonian fish may have a unique Na(+) transport system. Addition of 5-10 mgCl(-1) of dissolved organic matter (DOM) did not prevent initial (0-3h) negative Na(+) balance in tambaqui exposed to Cu. Exposure to 40 mgCl(-1) DOM prevented Na(+) losses in tambaqui even at 400 microgl(-1) Cu, probably because most Cu was complexed to DOM. Tambaqui exposed to waterborne Cd (10-80 microgl(-1)) experienced an average of 42% inhibition in whole body Ca(2+) uptake relative to controls within 3h of exposure to the metal. Inhibition of Ca(2+) uptake increased over time and, at 24h, Ca(2+) uptake was suppressed by 51% and 91% in fish exposed to 10 and 80 microgl(-1) Cd, respectively. Previous acclimation of fish to either elevated [Ca(2+)] or elevated [DOM] proved to be very effective in protecting against acute short-term metal accumulation at the gills of tambaqui in soft water (in the absence of the protective agent during metal exposure), suggesting a conditioning effect on gill metal binding physiology. PMID:16051381

  3. Evaluación de una solución inmovilizadora para criopreservación del semen de Colossoma macropomum, “Gamitana”

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    Ehrlich Llasaca-Calizaya

    2015-01-01

    Full Text Available El objetivo del trabajo fue la criopreservacion de semen, que permitirá constituir un banco genético, para lo cual se buscó obtener una solución  inactivadora de colecta para el semen de Colossoma macropomum  “gamitana”, que permita obtener espermatozoides, con buena motilidad de activación después de la descongelación, en nitrógeno líquido. Se utilizó semen de reproductores mantenidos, del Instituto de Investigaciones de la Amazonía Peruana (IIAP inducidos con Conceptal® y sin inducir mantenidos en el Centro de Acuicultura Nuevo Horizonte del Fondo Nacional de Desarrollo Pesquero (CANH - FONDEPES. El semen fue colectado en soluciones inactivadoras de 9% y 10% de NaCl, añadiendo 2 g/L, 4 g/L y 8 g/L de NaHCO3,  soluciones de sacarosa (300 mM, 400 mM y 500 mM sola o con 1,5 g/L, 1 g/L y 0,5 g/Lde NaCl. Se concluye que el tratamiento de 400 mM de sacarosa dio el mejor resultado, con una motilidad del 80% y 40 segundos de duración. También se evaluó la motilidad, después de una hora de almacenamiento a temperatura ambiente, con 60% de motilidad después de la activación y 20 segundos de duración. Este trabajo permitirá desarrollar  un protocolo de criopreservación para lotes de semen inmovilizados, con tiempo suficiente para preparar las pajuelas, congelarlas en nitrógeno líquido y optimizar el manejo de reproductores.

  4. Coeficientes de digestibilidad aparente de harina de pescado peruana y maíz amarillo duro para Colossoma macropomum (Actinopterygii, Characidae

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    Felix Walter Gutierrez

    2008-12-01

    Full Text Available Los Coeficientes de Digestibilidad Aparente (CDA de la materia seca (MS, proteína cruda (PC, lípido crudo(LC y energía bruta (EB de los ingredientes alimenticios harina de pescado peruana (HPP y de maíz amarillo duro (MAD fueron determinados en juveniles de Colossoma macropomum (150,0 ± 25,5 g. En el experimento la dieta de referencia se mezcló con cada uno de los ingredientes prueba en una relación de 70:30. El óxido crómico se usó como indicador inerte. La dieta de referencia y las dietas prueba fueron suministradas a C. macropomum, criada a 27 ºC, 7 mg/L de oxígeno disuelto y pH entre 7,5. Las muestras fecales fueron colectadas por sifoneo. Los CDA para MS, PC, LC y EB de la HPP fueron de 88,06 ± 0,83%, 87,08 ± 1,34%, 85,87 ± 2,69 y 87,29 ± 1,57% respectivamente. Igualmente los CDA para MS, PC, LC y EB del MAD fueron de 82,38 ± 1,02%, 75,46 ± 1,53%, 76,17 ± 2,43% y 75,04 ± 1,80% respectivamente. La energía digestible aparente calculada fue de 3950 Kcal/kg para la HPP y 2830 kcal/kg para el MAD. Se concluye que C. macropomum digiere mejor las fracciones proteicas y energéticas de la HPP. Al mismo tiempo muestra que digiere también la fracción energética del MAD, proveniente de los carbohidratos solubles.

  5. Determinação da dose inseminante e embriogênese na fertilização artificial de tambaqui (Colossoma macropomum

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    L.V. Leite

    2013-04-01

    Full Text Available Determinou-se a dose inseminante para fertilização artificial e descreveu-se o desenvolvimento embrionário de tambaqui (Colossoma macropomum. Os gametas foram coletados de reprodutores induzidos hormonalmente. Foi realizada fertilização artificial nas proporções de espermatozoides/ovócito de D1-50.666; D2-75.999; D3-101.332; D4-126.665; D5-151.998. O desenvolvimento embrionário foi acompanhado por meio de observações periódicas em estereoscópio até a eclosão dos ovos. Na fase de fechamento do blastóporo foi calculada a taxa de fertilização nas diferentes doses inseminantes. A porcentagem de fertilização aumentou de forma linear segundo a equação Ŷ =0,050 + 0,00000773X (R²=97,5, atingindo um platô em 84% na proporção de 102.486 espermatozoides/ovócito. Os embriões apresentaram segmentação meroblástica discoidal, típica de ovos telolécitos, com eclosão ocorrendo aos 357 horas-grau após a fertilização. Conclui-se que o desenvolvimento embrionário de tambaqui obedece ao esperado para peixes com ovos telolécitos e recomenda-se o uso da dose inseminante de aproximadamente 100.000 espermatozoides/ovócito na rotina de fertilização artificial dessa espécie.

  6. Reservoir analogues of deep water ramp: a mud-rich (Apiuna unit, Santa Catarina) and a sand-rich system (Punta Negra Formation, Argentine Precordillera); Analogos de reservatorios de rampa de agua profunda: sistemas ricos em lama (unidade de Apiuna-SC) e em areia (Formacao Punta Negra, Pre-Cordilheira Argentina)

    Energy Technology Data Exchange (ETDEWEB)

    Luca, Pedro Henrique Vieira de [Universidade Estadual de Campinas (IG/UNICAMP), SP (Brazil). Inst. de Geociencias. Programa de Pos-Graduacao DEP], E-mail: Pedro.Luca@ige.unicamp.br; Basilici, Giorgio [Universidade Estadual de Campinas (IG/UNICAMP), SP (Brazil). Inst. de Geociencias. DGRN], E-mail: basilici@ige.unicamp.br

    2008-03-15

    Two main reasons justify the use of outcrops in petroleum geology. The former, almost obvious, is related to the outcrop study in sedimentary successions with potential hydrocarbon exploration. The second is the production of models of geometric reservoirs distribution. In this work we consider two deep water system models generated from outcrop analysis. A mud-rich deep water ramp and a sand-rich deep water ramp, represented, respectively by: 1) Apiuna Unit, pre- Cambrian, Santa Catarina State and 2) Punta Negra Formation, Devonian, Argentine Precordillera. The Apiuna Unit is 4,500 m thick mainly constituted by laminates mudstones crosscut by channel and sheet sand systems, irregularly distributed. The Punta Negra Formation is characterized by the predominance of sandy deposits, originated in long unconfined sand sheet bodies with a wedge geometry crosscut by confined sandstones. The presence of various channelized bed forms oriented approximately in the same direction, in an extensive area of 250 km, suggests a multiple sedimentary input ramp system to this unit. The depositional architecture reconstruction shows that in sand-rich systems the dimension, petrophysical properties and connectivity of the sandstones construct better potential reservoirs. The reservoir quality and distribution in mud-rich ramp systems show more risks in oil exploration. However, differently than mud-rich systems, the sand-rich systems does not have sealing rocks. (author)

  7. Effect of gender on growth performance, carcass characteristics and meat and fat quality of calves of Avileña-Negra Ibérica breed fattened under free-range conditions

    OpenAIRE

    Argimiro Daza; Ana I. Rey; Celia Lopez-Carrasco; Lopez-Bote, Clemente J.

    2014-01-01

    The effect of gender (entire males vs females) on growth performance, carcass traits and meat and fat quality of Avileña-Negra Ibérica calves, fattened under free range conditions and supplemented with concentrate, were investigated. The average daily gain, leg width and thorax depth were higher in males than in females. Carcass conformation score, fore-quarter weight and percentage in carcass were higher in males than in females, whereas dressing percentege, loins and flank percentages in ca...

  8. Origin of pegmatites and fluids at Ponta Negra (RJ, Brazil) during late- to post-collisional stages of the Gondwana Assembly

    Science.gov (United States)

    Bongiolo, Everton Marques; Renac, Christophe; Piza, Patricia d'Almeida de Toledo; Schmitt, Renata da Silva; Mexias, André Sampaio

    2016-01-01

    The Ponta Negra Pegmatites (PNP), part of a pegmatitic province in Rio de Janeiro State, Brazil, crop out along an intensely deformed, medium- to high-grade metamorphic area that is proximal to a crustal-scale thrust zone developed during the Brasiliano/Pan-African Orogeny. Fieldwork shows that the pegmatites formed in two distinct stages: (i) syn-collisional leucosome veins (Group I) conformable with the tectonic foliation of the gneissic host rocks and (ii) late- to post-collisional dykes (Group II) that cross-cut the same tectonic foliation at a high angle. In this paper, we use geochemistry of whole-rock and mineral separates (alkali-feldspar and biotite), fluid inclusion microthermometry and stable isotopic (δ18O, δD, δ13C) determinations on minerals (quartz, alkali-feldspar, biotite and magnetite) and fluid inclusions to provide insights into the composition of the pegmatite-forming melts, associated fluids, and their geotectonic significance. U-Pb SHRIMP dating of the Cajú syenogranite was performed to evaluate and compare the timing of magmatic events along the Cabo Frio Tectonic Domain as this is the closest post-collisional pluton to the studied pegmatites. The calculated temperature for the Group I syn-collisional veins (740 °C) is similar to previous estimates for the peak metamorphic conditions in the study area. Variations in the temperature of the Group II pegmatite dykes obtained from stable isotopes (380 to 720 °C), and microthermometric data from primary fluid inclusions with traces of N2 (Th = 280 to 360 °C), may reflect the thermodynamics of the pegmatite crystallization, exsolution textures and isotopic exchange. The composition of fluids in equilibrium within the pegmatite dykes consists of magmatic and metamorphic components. The minimum pressures calculated for the emplacement of the pegmatites are equivalent to a shallow crustal depth between 1.7 and 3.5 km, which corresponds to the exhumation of the orogen since the emplacement of

  9. Crianças negras na história: Fontes e discursos sobre a breve infância permitida pelo escravismo oitocentista brasileiro

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    Ione da Silva Jovino

    2015-08-01

    Full Text Available The article presents part of historical research on children, childhood and race in the 19th century iconography. The main aim of the article is to discuss how children and black childhood were represented in a number of pictorial materials. Focusing on childhood history and its interfaces with Brazilian slavery history, the article presents a brief introduction about the sources and the research field. The analysis aims to show traces of black childhood in the 19th century, from travel literature to memory journals. Some aspects of children’s life, such as play and education point out that, even in a limited and restricted way, it was possible to demonstrate that children experienced childhood moments; it was also possible to envision their form of resistance to adult impositions. Some reflections about education are exposed before discussing the relation between childhood and work and the presentation of children´s perceptions of slavery, collected from literary texts. The final considerations are based on the analysis of a short story written at the beginning of the 20th century, which still presents traces of slavery by showing an enslaved black child, despite out of formal slavery. Despite the harshness of slavery, the article considers the possibility of a playful childhood, which is mediating, playful, challenging, made up of few moments of satisfaction among toys, games, pranks and transgressions. O artigo apresenta recortes de uma pesquisa histórica sobre criança, infância e raça na iconografia do século XIX, sendo a discussão sobre a maneira como eram representadas crianças e infâncias negras em diversos materiais imagéticos o objetivo principal. Com olhar centrado na história da infância e suas interfaces com a da escravidão no Brasil, o texto começa por apresentar breve introdução sobre as fontes e campos utilizados na pesquisa. A análise busca evidenciar vestígios da infância negra no século XIX, iniciando com

  10. Matrices coloniales y diásporas africanas: Hacia una investigación de las culturas negra y mulata en la Nueva Granada

    Directory of Open Access Journals (Sweden)

    Rafael Antonio Díaz Díaz

    2003-12-01

    Full Text Available Witches who steal your soul by embracing you, councils of blacks and mulattos, secret dances, dances of blacks during religious festivals and games of all type, prohibited drums, demons of resistance, communities of runaway slaves, parties of mulattos, mulattos dressed up as women, singing instruments-these are some of the most important cultural manifestations of the black and mulatto population in the Kingdom of New Granada. However, they share with other social sectors (Native Americans, Spaniards and mestizos their own processes of constructing a wide array of colonial cultures, shaded by regional spaces and their own historic, social and demographic dynamic. This article, then, takes as its primary axis of investigation an analysis of the make-up of that which, provisionally, I will call black and mulatto culture. To achieve this, the research will be shaped by theory of colonial culture. Later, I will focus on the field of the transatlantic stages as a fluid scene of the African Diaspora, and I will attempt to recuperate the African dimension of this Diaspora.//Brujas que roban el alma al abrazar, concilios de negros y mulatos, danzas secretas, danzas de negros durante festivales religiosos y juegos de todo tipo, tambores prohibidos, demonios, comunidades de esclavos fugitivos, fiestas de mulatos, mulatos vestidos como mujeres, instrumentos de canto. Estas son unas de las manifestaciones culturales de las poblaciones negra y mulata en el Reino de la Nueva Granada. Sin embargo, ellos comparten con otros sectores sociales (nativos americanos, españoles y mestizos su propio proceso de construcción de una amplia matriz de cultural coloniales, ensombrecida por los espacios regionales y por sus propias dinámicas históricas, demográficas y sociales. Este artículo toma como eje principal de investigación el análisis de la construcción de algo que en primera instancia llamaré cultura negra y mulata. Para lograr este objetivo el ensayo

  11. Detecção de fungos patogênicos em sementes de acácia-negra (Acacia mearnsii De Wild.

    Directory of Open Access Journals (Sweden)

    Flávia Elise Meneghini dos Santos

    2009-10-01

    Full Text Available Normal 0 21 MicrosoftInternetExplorer4 A presença de fungos pode reduzir a capacidade germinativa de um lote de sementes, causar a morte de plântulas ou transmitir doenças para plantas adultas. É necessário conhecer os agentes, as causas e as conseqüências decorrentes da contaminação por fungos patogênicos. Desse modo, o presente estudo teve como objetivo identificar os fungos associados às sementes de Acacia mearnsii De Wild, armazenadas a 5°C, por um período de 12 meses. Foram  utilizadas  sementes  de  acácia- -negra oriundas de plantio comercial, aos 4 anos de idade cuja procedência é África do Sul. As sementes foram colhidas em  três  épocas  distintas: (i quando com frutos verdes e/ou pigmentados;          (ii quando com frutos negros e início de abertura das vagens; (iii quando com sementes coletadas no solo, após a dispersão natural, sendo empregadas como testemunha. Os fungos associados às sementes foram: Botryodiplodia sp., Botrytis sp. (família Moniliaceae, Cladosporium sp.(família Dematiaceae, Cylindrocladium sp., Fusarium sp., Penicillium sp., Pestalotia sp., Rhizoctonia sp., Trichoderma sp. e outros fungos não identificados. De maneira geral, a autoclavagem das sementes promoveu maiores taxas de germinação e a eliminação de fungos associados. As sementes, que apresentaram maior contaminação por fungos, foram aquelas oriundas da coleta no solo. Os fungos de solo observados, que poderiam ocasionar danos em plântulas no viveiro e, simultaneamente, estarem associados à gomose em acácia-negra, foram:  Botrytis sp., Cylindrocladium sp.

  12. Effects of copper and cadmium on ion transport and gill metal binding in the Amazonian teleost tambaqui (Colossoma macropomum) in extremely soft water

    International Nuclear Information System (INIS)

    Metal toxicity in fish is expected to be most severe in soft waters because of the low availability of cations (particularly Ca2+) to out-compete the metal forms for binding sites on the gills. Natural waters in the Amazon basin are typically soft due to regional geochemistry, but few studies have focused on metal toxicity in fish native to the basin. We assessed the ionoregulatory effects of waterborne copper (Cu) and cadmium (Cd) on tambaqui (Colossoma macropomum) in extremely soft water (10 μmol l-1 Ca2+). Tambaqui had a very high tolerance to Cu (50-400 μg l-1), as indicated by a complete lack of inhibition of Na+ uptake and an ability to gradually recover over 6 h from elevated diffusive Na+ losses caused by Cu. The insensitivity of active Na+ influx to Cu further supports the notion that Amazonian fish may have a unique Na+ transport system. Addition of 5-10 mg C l-1 of dissolved organic matter (DOM) did not prevent initial (0-3 h) negative Na+ balance in tambaqui exposed to Cu. Exposure to 40 mg C l-1 DOM prevented Na+ losses in tambaqui even at 400 μg l-1 Cu, probably because most Cu was complexed to DOM. Tambaqui exposed to waterborne Cd (10-80 μg l-1) experienced an average of 42% inhibition in whole body Ca2+ uptake relative to controls within 3 h of exposure to the metal. Inhibition of Ca2+ uptake increased over time and, at 24 h, Ca2+ uptake was suppressed by 51% and 91% in fish exposed to 10 and 80 μg l-1 Cd, respectively. Previous acclimation of fish to either elevated [Ca2+] or elevated [DOM] proved to be very effective in protecting against acute short-term metal accumulation at the gills of tambaqui in soft water (in the absence of the protective agent during metal exposure), suggesting a conditioning effect on gill metal binding physiology

  13. Acute effects of chemically dispersed crude oil on gill ion regulation, plasma ion levels and haematological parameters in tambaqui (Colossoma macropomum).

    Science.gov (United States)

    Duarte, Rafael Mendonça; Honda, Rubens Tomio; Val, Adalberto Luis

    2010-04-15

    The main goal of this study was to investigate the toxicological effects of the chemical dispersant Corexit 9500, crude oil and the combination of the two components in the form of chemically dispersed crude oil (CO+DIS) on the ion regulation of the tropical fish tambaqui (Colossoma macropomum). Gill ion regulation was evaluated on the basis of unidirectional flux measurements (influx-J(in), efflux-J(out) and net flux-J(net)) of Na(+), Cl(-) and K(+). Plasma ion composition, haematocrit, haemoglobin and glucose concentrations in the blood of tambaqui were determined by classical methods. The exposure of fish to chemically dispersed crude oil promoted a significant increase in J(out) Na(+) across the gills, which, together with the inability of fish to stimulate Na(+) uptake to compensate for these losses resulted in significantly higher J(net) Na(+) outward, particularly within the first 3h of exposure. Increased outward J(net) Cl(-) was also seen in fish that were exposed to dispersed crude oil, whereas outward J(net) K(+) was only increased at crude oil dispersed in higher concentration of Corexit 9500. Plasma Na(+) and Cl(-) concentrations decreased between 6 and 12h of exposure, whereas Ca(2+) concentrations remained significantly lower than those of the control group over the entire experimental period. There were significant increases in plasma K(+) concentrations and in the haematocrit after 6 and 24h of exposure to dispersed crude oil, suggesting significant changes in the permeability of the erythrocytic membrane. Collectively, our results suggest that chemically dispersed crude oil promotes a more extensive impairment of gill ion regulation, in addition to changes in plasma ion levels and blood parameters, in tambaqui compared with exposure to Urucu crude oil or Corexit 9500 alone. Thus, in the event of an oil spill in Amazonian waters, the chemical dispersion of Urucu crude oil could represent a great risk to tambaqui, challenging their ability to

  14. Effects of copper and cadmium on ion transport and gill metal binding in the Amazonian teleost tambaqui (Colossoma macropomum) in extremely soft water

    Energy Technology Data Exchange (ETDEWEB)

    Matsuo, Aline Y.O. [Laboratory of Ecophysiology and Molecular Evolution, National Institute for Research in the Amazon (INPA), Av. Andre Araujo, 2936 Aleixo, Manaus, Amazonas 69083-000 (Brazil)]. E-mail: matsuoaline@aol.com; Wood, Chris M. [Department of Biology, McMaster University, 1280 Main St. West, Hamilton, Ont., L8S 4K1 (Canada); Val, Adalberto L. [Laboratory of Ecophysiology and Molecular Evolution, National Institute for Research in the Amazon (INPA), Av. Andre Araujo, 2936 Aleixo, Manaus, Amazonas 69083-000 (Brazil)

    2005-09-30

    Metal toxicity in fish is expected to be most severe in soft waters because of the low availability of cations (particularly Ca{sup 2+}) to out-compete the metal forms for binding sites on the gills. Natural waters in the Amazon basin are typically soft due to regional geochemistry, but few studies have focused on metal toxicity in fish native to the basin. We assessed the ionoregulatory effects of waterborne copper (Cu) and cadmium (Cd) on tambaqui (Colossoma macropomum) in extremely soft water (10 {mu}mol l{sup -1} Ca{sup 2+}). Tambaqui had a very high tolerance to Cu (50-400 {mu}g l{sup -1}), as indicated by a complete lack of inhibition of Na{sup +} uptake and an ability to gradually recover over 6 h from elevated diffusive Na{sup +} losses caused by Cu. The insensitivity of active Na{sup +} influx to Cu further supports the notion that Amazonian fish may have a unique Na{sup +} transport system. Addition of 5-10 mg C l{sup -1} of dissolved organic matter (DOM) did not prevent initial (0-3 h) negative Na{sup +} balance in tambaqui exposed to Cu. Exposure to 40 mg C l{sup -1} DOM prevented Na{sup +} losses in tambaqui even at 400 {mu}g l{sup -1} Cu, probably because most Cu was complexed to DOM. Tambaqui exposed to waterborne Cd (10-80 {mu}g l{sup -1}) experienced an average of 42% inhibition in whole body Ca{sup 2+} uptake relative to controls within 3 h of exposure to the metal. Inhibition of Ca{sup 2+} uptake increased over time and, at 24 h, Ca{sup 2+} uptake was suppressed by 51% and 91% in fish exposed to 10 and 80 {mu}g l{sup -1} Cd, respectively. Previous acclimation of fish to either elevated [Ca{sup 2+}] or elevated [DOM] proved to be very effective in protecting against acute short-term metal accumulation at the gills of tambaqui in soft water (in the absence of the protective agent during metal exposure), suggesting a conditioning effect on gill metal binding physiology.

  15. Exclusión de mujeres negras: Su representación en la enfermería profesional Exclusion of black women: its representation shaping the professional nursing

    Directory of Open Access Journals (Sweden)

    Paulo Fernando de Souza Campos

    2006-03-01

    Full Text Available Este estudio busca reflejar la exclusión de mujeres negras de los orígenes de la enfermería profesional brasileña. Basada en la historia cultural, el estudio presupone que la recomendación para que se evite la presencia negra en las primeras escuelas oficiales de formación superior, era necesaria la exclusión de las negras. Entre tanto, la memoria histórica del cuidado nos recuerda que las cuidadoras negras ejercían esa actividad junto a los enfermos antes de la organización de la enseñanza de la enfermería. Tales memorias crearon imágenes negativas sobre la identidad profesional de la enfermería brasileña, caracterizada esencialmente por la mujer blanca procedente de las élites. La reflexión nos permite suponer que las representaciones del negro en Brasil, reiteraron estereotipos que, a su vez, reprimían la inclusión de las negras en la enfermería moderna en la medida que la visibilidad de imágenes del proceso las proyectó como moralmente descalificadas, caracterizándolas como inapropiadas para el ejercicio del arte y de la ciencia del cuidado.This paper intends to reflect on the exclusion of black women from the origins of the Brazilian professional nursing. Based on cultural history, this study took for granted a recommendation to avoid black presence within the first official schools for nurses, which excluded black women, before the organization of the nursing education. However the historical memory of care brings up that black carers were looking after sick people. Such memories damaged the images of nursing professional identity, described essentially as practiced by white woman, daughter of the elite. This reflection allows us to suppose that representations of blacks in Brazil reiterated certain stereotypes which by its turn restrained black inclusions within modern nursing while images visibility from this process had projected them as morally unqualified, characterizing them as inappropriate to work for the art

  16. Acessibilidade à atenção básica a famílias negras em bairro popular de Salvador, Brasil Acceso a la atención básica de familias negras en comunidad popular de Salvador, Brasil Accessibility to primary health care by black families in a poor neighborhood of Salvador, Northeastern Brazil

    OpenAIRE

    Leny Alves Bomfim Trad; Marcelo Eduardo Pfeiffer Castellanos; Maria Clara da Silva Guimarães

    2012-01-01

    OBJETIVO: Analisar a acessibilidade de famílias negras de bairro popular aos serviços de atenção básica à saúde. MÉTODOS: Estudo etnográfico, ancorado na antropologia de base interpretativa, realizado com 18 famílias selecionadas de um bairro popular de Salvador, BA, no período de dois anos. Os critérios de inclusão foram residência no bairro e autoclassificação como negros. A análise se baseou na antropologia interpretativa e considerou as categorias: autorreferência étnico-racial; experiênc...

  17. Excreção de amônia por tambaqui (Colossoma macropomum) de acordo com variações na temperatura da água e massa do peixe

    OpenAIRE

    Ismiño-Orbe Rosa Angélica; Araujo-Lima Carlos Alberto Rego Monteiro; Gomes Levy de Carvalho

    2003-01-01

    A amônia, produto de excreção dos peixes, é tóxica para organismos aquáticos. O objetivo deste trabalho foi quantificar taxas de excreção diária de amônia em tambaqui (Colossoma macropomum), principal espécie criada na Amazônia, que podem variar de acordo com a temperatura da água e a massa dos peixes. As taxas de excreção foram determinadas a cada 2 horas por um período de 24 horas e os resultados analisados por uma regressão linear múltipla. O tambaqui apresentou de dois a cinco picos de at...

  18. Histología de branquias, hígado y riñón de juveniles del pez neotropical Colossoma macropomum (Characiformes, Characidae) expuesto a tres temperaturas

    OpenAIRE

    Luz-Marina Rojas; Claunis Mata; Aridays Oliveros; Raquel Salazar-Lugo

    2013-01-01

    Colossoma macropomum es uno de los peces tropicales de agua dulce con mayor éxito en el cultivo en aguas continentales tropicales. Se realizó una evaluación histológica de branquias, hígado y riñón de este pez expuesto a tres temperaturas (T18, T29 y T35ºC). Se utilizaron 18 ejemplares juveniles con índices biométricos de 17.87±7.88cm y 87.69±34.23g. Los análisis histológicos fueron hechos de acuerdo a técnicas previamente descritas. Se encontró que las branquias, el hígado y el riñón de los ...

  19. Algoritmos y cajas negras: el `programa Matlab en la formación básica en Economía y Finanzas

    Directory of Open Access Journals (Sweden)

    Julián Andrada Félix

    2000-01-01

    Full Text Available Los cursos de métodos cuantitativos que se imparten en las distintas facultades de Ciencias Económicas y Empresariales en general, permiten al alumno disponer de una serie de programas informáticos -cajas negras- que le otorgan la capacidad de realizar ciertos estudios interesantes. El alumno sabe qué necesita para resolver un problema cuantitativo y utiliza el programa informático adecuado para tal fin, pero no sabe de qué manera el ordenador resuelve el problema. En este trabajo pretendemos dar un giro respecto a esta metodología, enfatizando en un concepto fundamental en todo el desarrollo cuantitativo: el algoritmo. El enfoque del aprendizaje será la construcción de algoritmos netamente prácticos, de forma que se asimile su concepto a la misma vez que se implemente. Haremos un sencillo recorrido por ciertos problemas fácilmente resolubles a través de algoritmos implementados bajo el entorno de trabajo MATLAB.

  20. Las arenas negras de Mejías: nueva fuente para la obtención de consumibles para la soldadura por arco eléctrico

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    Amado Cruz-Crespo

    2001-03-01

    Full Text Available A partir de la caracterización química y mineralógica de las fracciones pesadas, magnéticas y electromagnéticas de las arenas negras del placer de Mejías, se logró confeccionar una carga metalúrgica para obtener una escoria útil como matriz de fundentes para la soldadura automática (SAW y una ferroaleación como carga aleante para diferentes consumibles de soldadura por arco eléctrico. La escoria obtenida presenta una composición de óxidos que garantiza las propiedades metalúrgicas y tecnológicas de la matriz de fundente deseado. La aleación compleja lograda por reducción carbotérmica en horno de arco eléctrico con crisol de grafito presenta relativamente altos contenidos de Mo (2,87 %, Nb(> 1,80 %, V(>1,20 %, entre otros elementos metálicos de alto valor metalúrgico para la soldadura manual (SMAW y automática (SAW.

  1. Levantamento florístico da floresta serrana da reserva biológica de Serra Negra, microrregião de Itaparica, Pernambuco, Brasil

    Directory of Open Access Journals (Sweden)

    Rodal Maria Jesus Nogueira

    2002-01-01

    Full Text Available O levantamento florístico, de duas áreas da Reserva Biológica de Serra Negra, localizada entre os municípios de Inajá e Floresta (8º35' - 8º38' S e 38º02' - 38º04' W, foi realizado fazendo-se 19 excursões para coleta de material botânico de Bryophyta, Pteridophyta e Magnoliophyta. No total foram coletados 319 taxa, 255 na floresta densa, situada no topo, e 117 na floresta aberta, localizada na escarpa meridional, com 12,5 % de similaridade (Jaccard. A análise de agrupamento mostrou que as duas áreas têm maiores similaridades com outras florestas serranas da região nordeste. A presença de condições abióticas diferenciadas, úmida no topo e mais seca na escarpa meridional, justifica as diferenças florísticas. Na floresta densa ocorreu um grande número de espécies com ampla distribuição nos domínios amazônico e atlântico, enquanto na floresta aberta parte das espécies foi mais relacionada à vegetação caducifólia espinhosa (caatinga, e outras têm distribuição ampla em florestas neotropicais.

  2. Suplementação de metionina e/ou lisina em rações para juvenis de tambaqui (Colossoma macropomum Cuvier, 1818 Reduction of protein levels and methionine and/or lysine supplementation in diets and their effects in total ammonia nitrogen excretion of tambaqui juveniles (Colossoma macropomum Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Lian V. Brandão

    2009-09-01

    Full Text Available Foi avaliado o efeito da redução dos níveis de proteína e a suplementação de metionina e/ou lisina em rações sobre a excreção de amônia em juvenis de tambaqui (Colossoma macropomum. O experimento foi realizado em delineamento inteiramente casualizado com esquema fatorial de duas entradas: 2 níveis protéicos (25 e 20% e 4 níveis de inclusão de aminoácidos: a 0% de suplementação, b DL-Metionina (3% da PB, c L-lisina (5% da PB e d Dl-Metionina (3% da PB + L-lisina (5% da PB, com duração de 55 dias. A coleta de água das unidades experimentais ocorreu em três momentos (1º dia, 27º dia e 55º dia durante o período experimental. Nestes dias, foram realizadas 3 coletas de amostras de água para análise de amônia de cada unidade experimental (08:00 , 14:00 e 20:00 horas. Os dados de excreção de amônia foram analisados por ANOVA com medidas repetidas no tempo a 5% do nível de significância. A redução em 5% do nível de proteína na dieta gerou uma diminuição de 28,4% na excreção de amônia. Contudo, a suplementação de lisina e metionina não influenciaram esta diminuição.It was evaluated the effect of the reduction of crude protein level (CP and the lysine and/or methionine supplementation in total ammonia nitrogen excretion on tambaqui (Colossoma macropomum juveniles. The experiment developed in a factorial and randomized design with two levels of protein contents (20% and 25% CP and four levels of amino acid supplementation: a Dl-methionine (0% of CP and L-lysine (0% of CP, b Dl-methionine (3% of CP, c L-lysine (5% of CP, d Dl-methionine (3% of CP + L-lysine (5% of CP, during 55 days. The water sampling from experimental units was done at 3 moments (1(0 day, 27(0 day e 55(0 day. In these days, 3 samples of each experimental unit were collected in elapsing of the time (08:00 a.m., 02:00 p.m. and 08:00 p.m.. The ammonia excretion data were analysed by repeated-measures ANOVA (p>0,05 with time as within effect. The

  3. Efeito do cloreto de sódio sobre as respostas fisiológicas e controle de helmintos monogenóides em tambaqui (Colossoma macropomum Effect of sodium chloride on physiological responses and monogenean control in tambaqui (Colossoma macropomum

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    Edsandra Campos Chagas

    2012-09-01

    Full Text Available O objetivo deste trabalho foi avaliar o efeito do sal (NaCl sobre as respostas fisiológicas e controle de helmintos monogenóides em tambaqui (Colossoma macropomum. Para isso, juvenis de tambaqui (42,38 ± 0,47 g; 13,90 ± 0,06 cm foram transferidos para tanques de 350L e aclimatados por um período de 24 horas. Os ensaios foram conduzidos utilizando as concentrações de 0, 2, 4, 6 e 8 g de sal comum L-1 de água, nos tempos de exposição de 30, 60 e 120 minutos, com três repetições por tratamento. A tolerância dos tambaquis ao sal e a eficácia deste sobre os helmintos monogenóides foi avaliada mediante análise dos indicadores fisiológicos (glicose, cloretos, sódio e potássio plasmático e parasitológicos (número total de parasitas e prevalência. Tambaquis expostos a 4 g NaCl L-1 por 120 minutos, 6 e 8 g NaCl L-1 por 60 e 120 minutos apresentaram maior elevação da glicose plasmática e na concentração de 8 g NaCl L-1 por 120 minutos maiores níveis de cloreto plasmático. A prevalência de monogenóides nas brânquias foi de 100% e todas as concentrações de sal avaliadas neste estudo não foram eficazes na redução dos helmintos monogenóides em tambaqui.The objective of this work was to evaluate the effect of salt (NaCl on physiological responses and monogenean control in tambaqui (Colossoma macropomum. Juveniles of tambaqui (42.38 ± 0.47 g; 13.90 ± 0.06 cm were transferred to 350L tanks and acclimated for a period of 24 hours. The assays were conducted using the concentrations of 0, 2, 4, 6 and 8 g of NaCl L-1 of water, exposed to 30, 60 and 120 minutes, with three replicates in each treatment. The tambaqui tolerance to salt and the efficacy against monogenean were evaluated by physiological analysis (glucose, chloride, sodium and potassium plasmatic concentrations and parasitic indices (total number of parasites and prevalence. Tambaquis exposed to 4 g NaCl L-1 for 120 minutes, 6 and 8 g NaCl L-1 for 60 and 120

  4. Nutritional characteristics of amazonian fish fat (Colossoma macropomum and its effect on lipid metabolism of rats fed hypercholesterolemic diets Características nutricionais do tambaqui (Colossoma Macropomum e seu efeito no metabolismo lipídico de ratos alimentados com dietas ricas em colesterol

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    Raimundo Vicente de Sousa

    2002-01-01

    Full Text Available The effects of fat from tambaqui (Colossoma macropomum, an Amazonian fish, on some nutritional and lipid parameters in rats were evaluated. Weaned Wistar rats were fed for 6 weeks with hypercholesterolemic diets containing 7.5% of soybean oil (SO, cod liver oil (CO, lard (LA, or tambaqui fat (TF. Food consumption, weight gain, and food conversion were measured weekly. Plasma triglycerides was determined at the beginning and on the 6th week of experiment. Plasma cholesterol was determined at 0, 2, 4 and 6 weeks. After the sacrifice, hepatic lipids (triglycerides and cholesterol and plasma triglycerides, total cholesterol and HDL fractions were determined. Food consumption and weight gain were the same for all groups. There were no differences in plasma triglycerides among the four groups in the 1st and 6th weeks. Regarding the cholesterolemia, TF animals were similar to those fed SO diet, significantly lower than in LA group but higher compared to the CO group. The levels of very low density lipoprotein + low density lipoprotein (VLDL+LDL were higher in the TF and LA groups compared to the CO and SO groups. However, TA fed animals had high-density lipoprotein (HDL cholesterol levels higher than the CO group. The ratio (VLDL+LDL/HDL was higher in the LA group when compared with the remaining groups. In the TA group, the triglycerides and cholesterol concentrations in the liver were similar to the SO group. It may be concluded that tambaqui fat is a good dietary source of lipids as a substitute for lard and similar to soybean oil, as far as atherosclerosis risks is concerned.Os efeitos da ingestão da gordura de Tambaqui (Colossoma macropomum foram analisados em relação a alguns parâmetros nutricionais e lipídicos. Para isso ratos Wistar recém desmamados alimentados por 6 semanas com dietas aterogênicas contendo 7,5% óleo de soja (SO, óleo de fígado de bacalhau (CO, sebo (LA, ou gordura de Tambaqui (TF foram utilizados. Consumo alimentar e

  5. Manejo de Sigatoka negra (Mycosphaerella Fijiensis var. Difformis Morelet en plátano cv. “Curraré” en San Carlos, Zona Norte

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    Carlos Muñoz Ruiz

    2005-05-01

    Full Text Available Se evaluaron los diferentes productos químicos, utilizados en el control de Sigatoka negra en banano, en el cultivo de plátano, en la zona de Santa Clara de San Carlos. Uno de los principales objetivos fue generar un programa de manejo químico de la enfermedad para la zona de San Carlos, posible de ser transferido a otras zonas plataneras del país; el otro objetivo fue establecer las bases para automatizar las actividades culturales de manejo de plantaciones de musáceas, mediante la creación de un Software para computadora y asequible por internet. Para el primer objetivo, se logró establecer que genéticamente el plátano es más resistente a la enfermedad y, por ser un cultivo donde hasta el momento, no se ha sobrepasado el uso de funguicidas como sucede en el banano, se pueden utilizar sin problema los productos protectantes mas comunes, como el Vondozeb y el Ridodur, tanto en aceite como en agua, así como el aceite puro a 7 litros/ha, presentando un efecto aceptable en el control de la infección de Mycospharella. Los productos sistémicos utilizados mostraron su eficiencia aunque, por su costo, no se sugiere su uso en plátano, solo para casos de emergencia. La mezcla de protectantes con sistémicos y aceite (cocteles, se consideran muy efectivos pero innecesarios para ser utilizados en plátano en forma comercial. Para esta evaluación se hicieron 35 aplicaciones o semanas de evaluación, en dos periodos climatológicos (verano e invierno de enero a septiembre del 2001, combinadas con las prácticas culturales tradicionales de deshoja, deshija, fertilización, y el monitoreo, utilizando la escala de signos visuales de 6 puntos de Stover y el método francés. Se evaluaron las variables: Hojas por planta (H/P, Hoja mas joven enferma (HMJE y Porcentaje ponderado de infecci��n (PPI, para cada tipo de grupo químico evaluado. La variable H/P, en la mayoría de los grupos se inició con un mínimo de 3 hojas hasta un máximo de 14

  6. ANÁLISE DE PAISAGENS TURÍSTICAS DA PRAIA DE PONTA NEGRA (NATAL/RN COM A UTILIZAÇÃO DE INDICADORES DE QUALIDADE VISUAL: UMA CONTRIBUIÇÃO PARA O TURISMO SUSTENTÁVEL

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    Ilton Araújo Soares

    2014-02-01

    Full Text Available As paisagens estão entre os principais responsáveis pela atratividade dos destinos turísticos, ao mesmo tempo em que, muitas vezes, são degradadas devido a práticas ambientalmente insustentáveis da atividade turística. Diante desse contexto, esse trabalho tem como objetivo investigar a qualidade visual das paisagens turísticas da Praia de Ponta Negra (Natal/RN e contribuir para seu uso de forma sustentável. Para isso, utilizou-se como suporte teórico o método sistêmico e como metodologia um conjunto de indicadores de qualidade visual de paisagem. Constatou-se que além da duna do Morro do Careca, outros aspectos físicos contribuem para qualidade visual da paisagem de Ponta Negra, como a forma da orla em enseada. A legislação urbanística e ambiental de Natal é outro elemento que contribui para a proteção da paisagem de Ponta Negra. Foram detectados como detratores a artificialização provocada pela inserção de estruturas físicas que diminuem a naturalidade da praia, a poluição hídrica provocada pelos esgotos despejados na galeria de águas pluviais e a poluição sonora que ocorre devido ao barulho gerado pelos vendedores de CDs e DVDs. Os indicadores de naturalidade e diversidade apontaram que essas características ocorrem fundamentalmente no entorno no Morro do Careca. Por fim, ressalta-se a importância da perspectiva do turismo sustentável como estratégia que garanta a proteção das paisagens naturais e a própria manutenção da atividade turística.

  7. Estudio de los factores que afectan a la velocidad de neutralización de la pulpa durante la elaboración de aceitunas tipo negras

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    Brenes, M.

    1993-06-01

    Full Text Available The present work investigates the influence of various factors on the rate of neutralization of black olive flesh during the blackening stage. Of the neutralizing agents studied (hydrochloric acid and carbon dioxide, CO2 proved to be much more effective. Washing with harder water lessened the rate of neutralization. In addition a rise in temperature also exerts a beneficial influence, although heating never produces a better effect than the use of CO2. These results allow for a more rational and effective neutralizing process to be developed. This, in turn, could lead to a significant reduction in the amount of waste produced in this phase under present practices.

    El trabajo estudia la influencia de varios factores sobre la velocidad de neutralización de la pulpa de aceitunas tipo negras durante la etapa de ennegrecimiento. De los agentes neutralizantes estudiados (ácido clorhídrico y anhídrido carbónico, el CO2 ha mostrado una considerable mayor efectividad; el aumento de la dureza del agua empleada en los lavados disminuye la velocidad de neutralización. Finalmente, la temperatura tiene también una influencia beneficiosa, aunque nunca llega a superar el efecto del empleo de CO2. Estos resultados permiten diseñar este proceso de neutralización de forma más racional y eficaz, lo que, a su vez, puede dar lugar a reducir significativamente el volumen de vertidos que actualmente se producen en esta fase.

  8. Depuración de las aguas de lavado de aceitunas negras mediante procesos biológico aerobio y de ozonización

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    García Rodríguez, Juan

    2001-08-01

    Full Text Available The purification of black olive washed waters has been studied by an aerobic biological treatment, an ozonation process and by the combination of both sequential processes: ozone-biological and biological-ozone. Biodegradation experiments have been carried out modifying the initial substrate and biomass concentration. In the ozonation experiments, temperature, pH and ozone partial pressure has been varied. A kinetic study applying the Contois’model to the biological experimental data was performed. In the ozonation process, supposing a firsts-order kinetic reaction with respect to COD and ozone, the kinetic constant was determined. In both combined treatments, the previous stage improved the reaction rate of the second stage. For the purification of these wastewaters, an aerobic biological treatment followed by an ozonation process was the most effective sequence.Se ha estudiado la depuración de las aguas de lavado del procesado de aceitunas negras por tratamientos biológico aerobio y de ozonización y por procesos combinados secuenciales ozono-biológico y biológico-ozono. Se han llevado a cabo experimentos de biodegradación modificando las concentraciones iniciales de sustrato y de biomasa. En los experimentos de ozonización se ha variado la temperatura, el pH y la presión parcial de ozono. Se ha realizado un estudio cinético aplicando el modelo de Contois a los procesos biológicos. Considerando reacciones de primer orden respecto de la DQO, se ha determinado la constante de velocidad en los procesos de ozonización. En los tratamientos combinados, la etapa previa supuso una mejora en la constante de velocidad de la segunda etapa. La secuencia depuración biológica aerobia seguida de ozonización resultó el proceso más eficaz para el tratamiento de estas aguas.

  9. Influence of feeding system on growth performance, carcass characteristics and meat and fat quality of Avileña-Negra Ibérica calves’ breed

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    Argimiro Daza

    2014-04-01

    Full Text Available The effect of feeding system (calves reared under free-range conditions supplemented with concentrate vs. calves fed on concentrate and cereal straw in confinement during finishing period on growth performance, carcass traits and meat and fat quality was investigated. Fourteen entire males of Avileña-Negra Ibérica breed were used. The feeding system had no effect on growth performance, carcass characteristics, muscle colour, drip losses and intramuscular fat (IMF percentage in Longissimus thoracis. Free-range calves had more content of vitamin E in omental fat and tended (p<0.1 to have more vitamin E in IMF than calves finished in confinement. C16:0 and C16:1 n-9 proportions in omental fat were higher in calves finished in confinement, while C18:1 n-7, C18:3 n-3, Σn-3 proportions were lower. The ratio Σpolyunsaturated fatty acids (PUFA to Σsaturated fatty acids (SFA was significantly greater in omental fat from free-range calves. The C14:0, C16:0, C16:1, C17:0, C17:1, C18:1 n-9 and Σmonounsaturated fatty acids (MUFA were higher and C18:3 n-3 and Σn-3 proportions lower in IMF from calves finished in confinement. The ratio C18:1 n-9 to C18:0 was higher in IMF from calves fed on concentrate and straw and the ratio ΣPUFA to ΣSFA tended (p<0.1 to be greater in free-range calves. Intramuscular fat percentage affected to fatty acid composition of Longissimus thoracis. Feeding system based in finishing calves in confinement with straw and concentrate can be replaced by supplementation with concentrate in grazing without detrimental effect on quality.

  10. Comportamiento de la severidad de ataque de Sigatoka negra (myscosphaerella fijiensis morelet en áreas productoras de plátano...

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    Vidal Sáez Sáez

    1999-01-01

    Full Text Available Condiciones de precipitación, temperatura y humedad del aire, determinan la severidad y daño que hace la Sigatoka Negra (Myscosphaerella fijiensis Morelet en plátanos (Musa AAB. En 1991, se identificó por primera vez esta enfermedad en Venezuela, y penetró por la región Sur del Lago de Maracaibo, la cual a su vez es una de las principales áreas productoras del renglón. Durante 1997 las precipitaciones disminuyeron en comparación con la serie histórica. El objetivo del trabajo fue determinar el comportamiento de la severidad de la enfermedad en el año 1997 bajo condiciones irregulares de la distribución de las lluvias. Para cumplir el mismo, se registró la precipitación en una estación meteorológica que se emplazó en una área productora de plátanos. Se evalúo la enfermedad a través promedio ponderado de infección (PPI de la Metodología de Stover (1989. Se estimaron los acumulados de precipitación, número de días con precipitación, número de eventos sin precipitación, y número de días sin precipitación para cuatro intervalos de tiempo previos a las fechas de evaluación de la enfermedad, se realizaron los análisis comparativos entre los registros de la estación y los índices de enfermedad. Los resultados evidencian que los repuntes de severidad, parecen ser favorecidos de la continuidad de los eventos de precipitación.

  11. O MODELO IRRIDEX DE DOXEY: BREVES CONSIDERAÇÕES ACERCA DE SUA APLICAÇÃO EM PONTA NEGRA (NATAL-RN

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    Jussara Danielle Martins Aires

    2011-07-01

    Full Text Available O turismo, enquanto atividade sociocultural, tem sua essência nas interações humanas, sobretudo nas relações entre visitados e visitantes. Conhecer as atitudes e percepções dos residentes das localidades turísticas frente à expansão dessa atividade faz se mister e auxiliam na elaboração e planificação de políticas públicas para o setor turístico. Assim, o presente artigo tem como objetivo principal discutir a aplicação do Modelo Irridex de Doxey em Ponta Negra, testado como método base em uma pesquisa desenvolvida em junho de 2009 pela autora. Esse modelo demonstra as supostas fases vivenciadas pelos residentes nas áreas de expansão turística, sendo considerado de grande valia para a teoria do turismo e um dos poucos que têm sido testados e comprovados em muitos núcleos turísticos. Os dados foram coletados junto aos moradores brasileiros residentes no bairro há pelo menos três anos. Utilizou-se um estudo do tipo exploratório-descritivo, tendo como método analítico o quali-quantitativo. Concluiu-se que o referido modelo foi considerado generalista e determinista. Foram percebidas características das quatro fases, mas as três últimas se destacaram, no resultado geral, menos do que a primeira. De fato, os residentes reconhecem os impactos negativos e positivos do turismo, e demonstram atitudes que podem ser enquadradas em um nível de transição entre as fases de euforia e apatia mencionadas por Doxey.  

  12. ANÁLISE DE PAISAGENS TURÍSTICAS DA PRAIA DE PONTA NEGRA (NATAL/RN) COM A UTILIZAÇÃO DE INDICADORES DE QUALIDADE VISUAL: UMA CONTRIBUIÇÃO PARA O TURISMO SUSTENTÁVEL

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    Ilton Araújo Soares; Carla Stefanea Cabral Medeiros; Antônio Sales Filho

    2014-01-01

    As paisagens estão entre os principais responsáveis pela atratividade dos destinos turísticos, ao mesmo tempo em que, muitas vezes, são degradadas devido a práticas ambientalmente insustentáveis da atividade turística. Diante desse contexto, esse trabalho tem como objetivo investigar a qualidade visual das paisagens turísticas da Praia de Ponta Negra (Natal/RN) e contribuir para seu uso de forma sustentável. Para isso, utilizou-se como suporte teórico o método sistêmico e como metodologia um ...

  13. El poshumanismo apocalíptico en la novela negra argentina contemporánea: Ciudad santa y 77 Apocalyptic Posthumanism in Contemporary Argentine Hardboiled: Ciudad santa and 77

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    Osvaldo Di Paolo

    2012-01-01

    El fin del mundo es un arquetipo milenario, el cual se ha acentuado en tiempos recientes. La obsesión actual con la destrucción del planeta también se evidencia en el género negro. Gran parte de la novela negra hispanoamericana del siglo XXI presenta una visión poshumanista y apocalíptica que revela la descentralización del individuo y manifiesta el caos, el miedo y el enfrentamiento de fuerzas opuestas que conllevan a la destrucción del género humano. Para demostrar mi tesis analizo dos nove...

  14. Análisis histórico-epistemológico de las concepciones de salud desde una perspectiva didáctica : narrando la “historia” de la peste negra medieval

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    Revel Chion Giavino, A.; Meinardi, E.

    2009-01-01

    En este trabajo presentamos el caso de la peste negra medieval como insumo para analizar y comparar la potencia didáctica de algunos modelos explicativos de la noción de enfermedad. Comenzamos examinando, desde una perspectiva educativa, algunas de las diferentes concepciones de salud que se han generado a lo largo del tiempo, concepciones que se inscriben en perspectivas uni- o multicausales. Proponemos utilizar la narración de “pequeñas historias” con el propósito de que los y las estudiant...

  15. Produção Arbórea e Animal em Sistema Silvipastoril com Acácia-negra (Acacia mearnsii) Trees and Animal Production in a Silvipastoral System with Black Wattle (Acacia mearnsii)

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    Zelia Maria de Souza Castilhos; Raquel Santiago Barro; José Flores Savian; Henrique Rogério Branco do Amaral

    2010-01-01

    Com o objetivo de avaliar o desempenho dos componentes arbóreo e animal em um sistema silvipastoril (SSP) com acácia-negra (Acacia mearnsii De Wild) e gramíneas perenes de verão, foi conduzido um trabalho em convênio com a empresa Seta S.A., na unidade da Fepagro em Tupanciretã, RS, no período de outubro de 1995 a maio de 2003. O delineamento experimental foi um bifatorial (espécie forrageira e densidade arbórea) inteiramente casualizado, com duas repetições. As espécies forrageiras ...

  16. A sexualidade, a saúde reprodutiva e a violência contra a mulher negra: aspectos de interesse para assistência de enfermagem Sexualidade, salud reprodutiva y violencia contra la mujer negra: revisión da literatura de interes para el cuidado de enfermería Sexuality, reproductive health and violence against the african brazilian women: aspects of interest for nursing care

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    Isabel Cristina Fonseca da Cruz

    2004-12-01

    Full Text Available Com base no referencial da teoria racial crítica, foi feita uma revisão da literatura com o objetivo de buscar informações que fundamentem uma ação profissional afirmativa contra o racismo e o sexismo, baseada em evidências científicas e culturalmente competente. Evidenciou-se que a sexualidade, a saúde reprodutiva e a violência contra a mulher negra são temas com literatura escassa, sugerindo que o racismo e o sexismo estão operantes por meio da omissão ou negligência do Estado pese a mobilização das mulheres negras. Concluiu-se que a discriminação institucional precisa ser explicitada e combatida por meio de várias ações afirmativas em relação à mulher negra que devem ser implementadas ou fortalecidas para a promoção da eqüidade em saúde.Con base en el referencial de la teoría racial crítica, se realizó una revisión de la literatura con el objetivo de buscar informaciones que fundamenten una acción profesional afirmativa contra el racismo y el sexismo, basada en evidencias científicas y culturalmente competentes. Se evidenció que la sexualidad, la salud reproductiva y la violencia contra la mujer negra son temas con literatura escasa, sugiriendo que el racismo y el sexismo están operantes por medio de la omisión o negligencia del Estado, pese a la mobilización de las mujeres negras. Se concluyó que la discriminación institucional precisa ser explicitada y combatida por medio de varias acciones afirmativas en relación a la mujer negra y deben ser implementadas o fortalecidas para la promoción de la equidad en salud.Based on the referential of the critical racial theory, a review of the literature was made with the objective of searching for information that leads to an affirmative professional action against racism and sexism, based on scientific evidences and culturally competent. It was evidenced that the sexuality, reproductive health and violence against African Brazilian women are themes with

  17. Progresso da sigatoka-negra (Mycosphaerella fijiensis) em bananeiras após a emissão do cacho no Município de Cáceres, Mato Grosso-Brasil Progress of black sigatoka (Mycosphaerella fijiensis) in banana plants after the bunch emergence in the district of Cáceres, Mato-Grosso-Brazil

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    Márcia Benedita Martins; João Pedro Valente; Leimi Kobayasti; Luadir Gasparotto

    2007-01-01

    A sigatoka-negra, causada pelo fungo Mycosphaerella fijiensis, pode causar 100% de perdas na produção das cultivares suscetíveis. O objetivo deste trabalho foi avaliar o progresso da sigatoka-negra em bananeiras após a emissão do cacho no Município de Cáceres, Mato Grosso. O experimento foi conduzido no período de fevereiro a dezembro de 2004 em plantios das cultivares Grande Naine, Maçã e Farta Velhaco, sendo esta última uma cultivar de plátano, do grupo Terra. As avaliações foram efetuadas ...

  18. Características hematológicas de teleósteos brasileiros. I. Série vermelha e dosagens de cortisol e glicose do plasma sangüíneo de espécimes de Colossoma macropomum em condições de cultivo - DOI: 10.4025/actascibiolsci.v20i0.4466 Hematological characteristics of Brazilian teleosts. I. Red blood cell and doses of blood plasma cortisol and glucose in Colossoma macropomum species in culture condition - DOI: 10.4025/actascibiolsci.v20i0.4466

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    Marcos Tavares-Dias; Elziane F. Silva Sandrim

    1998-01-01

    Foram utilizados no presente trabalho 30 exemplares sexualmente imaturos de Colossoma macropomum Cuvier, 1818 (Osteichthyes: Characidae) com 500 a 700g de peso total e 25,0 a 30,2cm de comprimento padrão, com aproximadamente um ano de idade. Tais indivíduos foram capturados em tanques da Estação de Piscicultura Usina São Geraldo, Sertãozinho (São Paulo, Brasil), e são provenientes de uma mesma desova. Foram determinados os valores médio da contagem total de eritrócitos, da hemoglobina, do hem...

  19. Mulheres Negras e HIV: determinantes de vulnerabilidade na região serrana do estado do Rio de Janeiro Black Women and HIV: vulnerability determinants in highland region of Rio de Janeiro

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    Verônica Santos Albuquerque

    2010-12-01

    Full Text Available Trata-se de estudo de base quantitativa que teve como objetivo central analisar componentes socioculturais e comportamentais relacionados ao processo de vulnerabilização ao HIV/aids a partir da percepção de mulheres negras na região serrana do estado do Rio de Janeiro. Para tal, foram entrevistadas 1.464 mulheres negras dos diferentes municípios que compõem essa região. Os principais determinantes que marcaram com maior intensidade a vulnerabilidade dessas mulheres associaram-se aos seguintes fatores: baixa escolaridade, renda e, consequentemente, acesso a bens e serviços, baixo índice de uso sistemático do preservativo e percepções de gênero, que reforçam a menor autonomia feminina na tomada de decisões protetoras.This quantitative study aimed at analyzing social, cultural and behavioral components related to HIV vulnerability from perception of black women who live on a specific region of Rio de Janeiro - the highland area. For that, 1,464 black women from different towns of this region were interviewed. The main components that influenced vulnerability of these women could be associated to some factors, like: poor schooling, poverty, and consequently a difficulty to access property and services, low rates of using condom appropriately and some gender perceptions that reinforce women's autonomy on protection decisions is very short.

  20. Optimum dietary protein requirement for Amazonian Tambaqui, Colossoma macropomum Cuvier, 1818, fed fish meal free diets Exigência protéica de juvenis de tambaqui, Colossoma macropomum Cuvier, 1818, alimentados com rações livres de farinha de peixe

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    César Augusto Oishi

    2010-12-01

    Full Text Available Fish meal free diets were formulated to contain graded protein levels as 25% (diet 1, 30% (diet 2, 35% (diet 3 and 40% (diet 4. The diets were fed to tambaqui juveniles (Colossoma macropomum (46.4 ± 6.3g in randomly designed recirculating systems for 60 days, to determine the optimum protein requirement for the fish. The final weight of the fish, weight gain (28.1, 28.5, 32.2, 28.0g and specific growth rate increased (P>0.05 consistently with increasing dietary protein up to treatment with 35% protein diet and then showed a declining trend. Feed intake followed the same trend resulting in best feed efficiency (62.5% in fish fed diet with 35% protein. Similarly, the protein intake increased significantly with increasing dietary protein levels and reduced after the fish fed with 35% protein; while protein efficiency ratio (2.28, 1.99, 1.87, 1.74 decreased with increasing dietary protein levels. Carcass ash and protein had linear relationship with dietary protein levels while the lipid showed a decreasing trend. Ammonia content (0.68, 0.73, 0.81, 1.21 mg L-1 of the experimental waters also increased (PForam formuladas quatro dietas sem a inclusão de farinha de peixes contendo os níveis crescentes de proteína de 25% (dieta 1, 30% (dieta 2, 35% (dieta 3 e 40% (dieta 4. As dietas foram fornecidas a juvenis de tambaqui (Colossoma macropomum (46.4 ± 6.3g distribuídos ao acaso em um sistema de recirculação durante 60 dias, para determinar o requerimento protéico ótimo para o peixe nesta faixa etária. O peso final dos peixes, o ganho de peso (28.1, 28.5, 32.2, 28.0g e a taxa de crescimento específico tiveram um aumento não significativo (P>0,05 conforme aumentou o nível protéico das rações até o nível de 35% proteína e então uma tendência ao declínio. O consumo de alimento seguiu a mesma tendência resultando em melhor eficiência alimentar (62.5% para os peixes alimentados com a dieta contendo 35% de proteína. Similarmente, o

  1. Modos de subjetivação de mulheres negras: efeitos da discriminação racial Black women subjectivity: effects of racial discrimination

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    Maria Luisa Pereira de Oliveira

    2009-08-01

    Full Text Available Neste estudo, buscou-se compreender os efeitos da discriminação racial na identidade e subjetividade de mulheres negras atendidas no programa SOS Racismo/Porto Alegre/RS. Essa pesquisa fundamentou-se em um grupo dispositivo, cujo objetivo foi ouvir as narrativas das mulheres que sofreram atos de racismo/discriminação e agenciar outras referências identitárias. O referencial teórico-metodológico utilizado para analisar o material empírico produzido nos grupos foi o das práticas discursivas, entendidas como a forma pela quais as pessoas produzem sentidos para experiências como as da violência racial. Os repertórios interpretativos presentes nos diálogos enunciados pelas mulheres referiam-se à discriminação racial e ao racismo e sinalizavam a construção de estratégias de enfrentamento e resistência. Acreditamos que a intervenção produziu efeitos políticos de reflexão e mudança, na medida em que o grupo construiu novos sentidos para as violências sofridas, transformando a narrativa pessoal em uma denúncia pública.In this study, we investigated the effects of racial discrimination on the identity and subjectivity patterns of black women assisted through the SOS Racism Program in Porto Alegre/RS. The research was based on a discussion group whose objective was to listen to the women's narratives of racial discrimination and agency other identity references. The theoretical and methodological support used to analyze the information was the discursive practice. This practice refers to the way by which people produce meaning in social interactions, like experiences of racial violence. The interpretative repertoires used by the women in the group dialogues were about racial discrimination and racism and pointed to the construction of resistance strategies. We believe that this intervention produces political effects of reflection and change, in the way that the group worked out new meanings for the violence suffered, changing

  2. Propaganda, grafite e as representações de uma cidade negra/Advertising, graffiti, and representations of a black city

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    John Finn

    2010-06-01

    Full Text Available Na imaginação geográfica dos Estados Unidos, o Brasil é um País de futebol, samba e biquínis. Representações do Brasil entram nos EUA através dos filtros culturais de Pelé e a Garota de Ipanema. Mas nesta visão se perde a historia intricada e complexa da raça no Brasil, especialmente na cidade do Salvador da Bahia. Mas, chegando de fora e vendo as representações raciais pela propaganda popular, nunca se imaginaria que mais de 80% dos soteropolitanos é de descendência africana. Neste artigo, contextualizarei primeiramente Salvador em termos raciais no Brasil. Então, após examinar as atuais teorias das raças e das suas representações, desconstruirei algumas das representações raciais mais chocantes e contraditórias, do ponto de vista de uma pessoa relativamente nova na Bahia. Concluirei com as observações do grafite como uma maneira popular de contestar as representações brancas dominantes numa cidade negra, através da qual as representações raciais são democratizadas nas superfícies verticais da capital baiana.In the geographical imagination of the United States, Brazil is a country of soccer, samba, and bikinis. Representations of Brazil enter the United States through the cultural filters of Pelé and the Girl from Ipanema. This view misses, however, the intricacies of Brazil’s troubled racial history, especially in the northeast city of Salvador, Bahia. Attempting to understand Salvador’s racial make-up in terms of popular visual media in the urban landscape, an outsider might never guess that more than 80% of the city’s population is of African descent. In this paper I will first contextualize Salvador in terms of race in Brazil. After briefly interrogating current thought in race and representation, I will then deconstruct some of the most shocking and contradictory representations of race in this Afro-Brazilian urban context. I conclude by wondering if much of the city’s graffiti isn’t an informal

  3. Excreção de amônia por tambaqui (Colossoma macropomum de acordo com variações na temperatura da água e massa do peixe

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    Ismiño-Orbe Rosa Angélica

    2003-01-01

    Full Text Available A amônia, produto de excreção dos peixes, é tóxica para organismos aquáticos. O objetivo deste trabalho foi quantificar taxas de excreção diária de amônia em tambaqui (Colossoma macropomum, principal espécie criada na Amazônia, que podem variar de acordo com a temperatura da água e a massa dos peixes. As taxas de excreção foram determinadas a cada 2 horas por um período de 24 horas e os resultados analisados por uma regressão linear múltipla. O tambaqui apresentou de dois a cinco picos de atividade de excreção durante 24 horas, caracterizados por rápidos aumentos de até dez vezes na taxa horária de excreção. O modelo desenvolvido pela regressão linear múltipla explicou 95,2% da taxa diária de excreção de amônia, que aumentou com a massa do peixe, mas diminuiu com o aumento da temperatura da água.

  4. La ‘Negra Nieves’ ou le racisme à fleur de peau. Regards croisés sur une caricature

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    2003-01-01

    Full Text Available Nieves, célèbre caricature colombienne d’une jeune femme ‘noire’, est l’occasion de mener une réflexion autour de trois questions théoriques : signification des catégories raciales, permanence des stéréotypes et rôle social des apparences physiques. Le personnage, en effet, a une longue histoire : occupant les pages du quotidien de Cali, El País, depuis 1968, il a d’abord été représenté sous forme d’employée domestique avant de devenir, suite à une action de tutelle dénonçant le racisme de la caricature, étudiante en philosophie à l’université. Nieves permet ainsi d’analyser les mécanismes de construction et de gestion de la relation à l’autre : infériorisation paternaliste émanant de l’élite, incorporation populaire de normes sociales racialisantes, ruptures et continuités liées à l’introduction du multiculturalisme, revendications et impasses du mouvement ethnique ‘noir’, vision culturaliste de l’anthropologie colombienne. Nieves, famosa caricatura colombiana de una mujer ‘negra’, nos permite hacer una reflexión alrededor de tres cuestiones teóricas: significación de las categorías raciales, permanencia de los estereotipos y papel social de las apariencias físicas. De hecho, el personaje tiene una larga historia: en las páginas del diario de Cali, El País, desde 1968, fue primero representado bajo los rasgos de una empleada doméstica antes de convertirse -en razón de una acción de tutela- en estudiante universitaria de filosofía. Intentaremos así analizar los mecanismos de construcción y manejo de la relación con el otro: inferiorización paternalista por parte de la elite, incorporación popular de las normas raciales, rupturas y continuidades ligadas a la introducción del multiculturalismo, reivindicaciones y dificultades del movimiento étnico ‘negro��, visión culturalista de la antropología colombiana. In this paper, the use and meaning of Nieves, a famous Colombian

  5. Estudio cinético del proceso de digestión anaerobia de las aguas residuales de la elaboración de aceitunas de mesa negras

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    Borja Padilla, R.

    1992-12-01

    Full Text Available A kinetic study of the anaerobic digestion process of wastewaters from black olive preparation was carried out. The bioreactors used accommodated various suspended micronized clay supports of different chemical composition (Sepiolite and Bentonite. Assuming that the overall anaerobic digestion process conforms to a first-order kinetics, experimental data pairs, namely the methane volume yielded (G and the time (t fitted the equation: G=Gm·[1-exp (-Ko·t], the rate coefficient, Ko, was determined in each of the situations studied. The support used has a marked influence on the kinetic constant of the process; the Sepiolite support yields significantly the highest values. The average Ko values, obtained in the rank of COD between 0 and 1 g/L were: 1,83 days-1 (Sepiolite and 1,23 days-1 (Bentonite. For values of COD greater than 1g/L, the specific rate constant decreased when the volume of wastewater added or substrate concentration was increased. The yield coefficients of methane, Yp/s, were 333 and 316 mL CH4/g COD for the Sepiolite and Bentonite reactor, respectively. Treatment yields of COD were above 95% in all the cases.

    Se ha efectuado un estudio cinético del proceso de digestión anaerobia de las aguas residuales obtenidas en la elaboración de aceitunas negras, mediante biorreactores que contienen en suspensión soportes micronizados de tipo arcilloso de distinta composición química (Sepiolita y Bentonita. Admitiendo que globalmente el proceso de digestión anaerobia sigue una cinética de primer orden, se ajustan las parejas de datos experimentales, volumen de metano acumulado (G, tiempo (t a la ecuación: G=Gm·[1-exp (-Ko·t], determinándose los valores del coeficiente de velocidad Ko, para cada caso estudiado. El soporte utilizado ejerce una influencia acusada sobre la constante cinética del proceso

  6. Plantio irrigado de bananeiras resistentes à Sigatoka-negra consorciado com culturas anuais Irrigated banana resistant to black Sigatoka, with annual intercrops

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    Ildeu de Souza

    2010-03-01

    Full Text Available Com o objetivo de avaliar o plantio irrigado de bananeiras resistentes à Sigatoka-negra consorciado com cultura anuais, na região norte de Minas Gerais, um experimento foi instalado na Fazenda Experimental do Departamento de Ciências Agrárias da Universidade Estadual de Montes Claros, Câmpus de Janaúba-MG. O experimento foi conduzido no período de abril de 2006 a julho de 2007, delineado em blocos casualizados, segundo um esquema de parcelas subdivididas 3 x 5, tendo na parcela as três variedades de bananeiras: Pacovan Ken, Caipira e Thap Maeo, e na subparcela quatro culturas intercalares: Feijão-Pérola, Quiabo-Dardo, Melancia-Crimson-Sweet e Feijão-Caupi, e a testemunha (sem cultura intercalar, com três repetições. Ao todo, foram 756 bananeiras, em 45 parcelas, com 6 plantas úteis cada, constituindo a cultura principal. As culturas intercalares ocuparam as entrelinhas da bananeira, tanto aquelas com as linhas de irrigação como sem linha de irrigação. O plantio da bananeira e das culturas intercalares foi feito no mesmo período, utilizando-se do espaçamento de 3,0 m entre as linhas e 2,0 m entre as covas de bananeira, com microaspersores espaçados de 6 m. Avaliaram-se as características vegetativas e reprodutivas das variedades de bananeiras, no primeiro ciclo. Não foi observado efeito significativo dos cultivos intercalares sobre as variedades de bananeiras, com exceção do número de dias do plantio ao florescimento e do número de dias do plantio à colheita das variedades de bananeiras. O uso do feijão-caupi promoveu atraso no ciclo de produção das três variedades de bananeiras Pacovan Ken, Caipira e Thap Maeo.To assess the irrigated cultivation of banana resistant to black Sigatoka, intercropped with annual crops in the northern region of Minas Gerais, a trial was conducted on an experimental farm of the Universidade Estadual de Montes Claros, in Janaúba-MG. The experiment was carried out from April 2006 to

  7. Entre la negación del racismo institucional y la etnización de la diversidad étnico-racial negra en programas de combate a la pobreza

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    Claudia Mosquera Rosero-Labbé

    2015-12-01

    Full Text Available El multiculturalismo en Colombia indica el reconocimiento, la promoción y la protección de personas, familias, comunidades, grupos o pueblos que se reconocen culturalmente como distintos dentro de la nación. El presente artículo analiza el significado del multiculturalismo para las y los profesionales que laboran en programas sociales. La investigación mostró la existencia de perspectivas ambiguas y contradictorias sobre la atención diferencial y el lugar de la diversidad étnico-racial negra en los programas sociales. Esas perspectivas explicitan resistencias epistémicas desde las cuales se excluye o trivializa el reconocimiento de la diversidad cultural en el espacio de la intervención social.

  8. «Lo personal es político»: Patrones de construcción de género en la Transición española. "Daniela Astor y la caja negra", de Marta Sanz

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    Somolinos Molina, Cristina

    2015-01-01

    En el marco de los denominados «nuevos realismos», Daniela Astor y la caja negra aborda la particular manera por la que las mujeres hubieron de enfrentarse a las contradicciones del periodo de la transición a la democracia en España. El análisis de la construcción de la identidad de género en el ámbito de lo personal y la transformación de esta identidad individual en conciencia política en la novela permite establecer relaciones entre las dinámicas de la sociedad española de 1978 en cuanto a...

  9. Cultura e afrodescendência: organizações negras e suas estratégias educacionais em Porto Alegre (1872-2002 / Culture and afrodescendência: black organizations and their strategies education in Porto Alegre (1872-2002

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    Lúcia Regina Brito Pereira

    2010-01-01

    Full Text Available Esta pesquisa investigou e interpretou a construção de estratégias educacionais por afrodescendentes implementadas por várias organizações negras em Porto Alegre, RS, a partir dos finais do século XIX, ao longo da Primeira República, Estado Novo e respectivas redemocratizações, até o ano de 2002. A saber, foram investigadas as organizações: Irmandade do Rosário, Sociedade Recreativa Beneficente Floresta Aurora, Sociedade Satélite Prontidão, o Clube Náutico Marcílio Dias e MARIA MULHER – Organização de Mulheres Negras. Ao longo desse período, as organizações negras tiveram diferentes configurações, de acordo com seus contextos, suas formas de composição e suas reivindicações que surgem a partir das condições, ou falta delas, advindas da sociedade mais abrangente. Essas organizações ı de cunho religioso, de ajuda mútua, cultural ou, na perspectiva atual, de organizações não-governamentais ı encerraram em si uma característica comum que se traduz na preservação da identidade e nas reivindicações para o estabelecimento de condições dignas de sobrevivência ao afrodescendentes. Devido à ausência de documentação da trajetória histórico-educacional da população negra, nos meios oficiais de divulgação, estatísticas, historiografia tradicional, esta investigação se valeu de registros em publicações específicas e de relatos de pessoas de referência, os quais permitem recuperar um perfil da atuação dessas organizações e fixar a memória daquilo que diz respeito a suas construções e reivindicações históricas e educacionais.Asbtract This research investigates and interprets the construction of educational strategies by afrodescendents implemented by several afro organizations in Porto Alegre, RS, from the end of the XIX century, over the First Republic, the New State and the respective re-democratizing processes until the year 2002. Over this period, the afro organizations had

  10. Mulheres negras: uma trajetória de criatividade, determinação e organização Black women: a trajectory of creativity, determination and organization

    OpenAIRE

    Matilde Ribeiro

    2008-01-01

    Este artigo busca fazer um breve registro focando o processo organizativo das mulheres negras em diálogo com: a inclusão de gênero e raça nas políticas públicas; a realização das conferências internacionais - em especial a Conferência Mundial sobre as Mulheres e a III Conferência Mundial contra o Racismo, a Discriminação Racial, a Xenofobia e as Formas Conexas de Intolerância; o pós-Durban, a ação e o monitoramento; e os 120 anos após a abolição da escravidão. Ao final, são formulados alguns ...

  11. Efecto del sexo y del cruzamiento sobre la calidad instrumental y sensorial y sobre la aceptación de la carne de añojos de la raza avileña-negra ibérica

    OpenAIRE

    Panea Doblado, Begoña; Ripoll García, Guillermo; Olleta Castañer, José Luis; Sañudo Astiz, Carlos

    2011-01-01

    Se estudió el efecto del cruce industrial (Avileña -Negra lbérica en pureza o cruzados por Charolés) y del sexo sobre el pH, color la carne y valoración sensorial con panel entrenado y consumidores de la carne de 30 animales de categoría añojo. El color estuvo mas influenciado por la base genética que por el sexo, resultando menos luminosa la carne de los animales en pureza que la de los cruzados. En general, la carne de las hembras fue mejor valorada que la de los machos. La maduración incre...

  12. Políticas públicas y su contribución en las relaciones de género: el caso de las jornaleras de la Sierra Negra poblana

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    Humberto Piñón-Vargas

    2012-01-01

    Full Text Available El objetivo de esta investigación es determinar el efecto del Programa de Atención a Jornaleros Agrícolas de la Secretaría de Desarrollo Social, en la condición y posición de género, de mujeres de la Sierra Negra de Puebla. El estudio fue de tipo descriptivo con diseño probabilístico estratificado. Se realizaron encuestas, entrevistas, estudio de pesas-medidas y de tiempos-movimientos. Los resultados muestran que la variable salud (25% de las variables inherentes a la condición de género, y las de control de recursos, toma de decisiones y violencia familiar (75% de las relativas a la posición de género, influyeron de manera positiva en la equidad de género.

  13. Tempos de racialização: o caso da 'saúde da população negra' no Brasil In times of racialization: the case of the 'health of the black population' in Brazil

    OpenAIRE

    Marcos Chor Maio; Simone Monteiro

    2005-01-01

    Este artigo tem por objetivo analisar as iniciativas para a criação de um campo de reflexão e intervenção política denominado 'saúde da população negra', no período entre 1996 e 2004, que contempla o governo FHC e parte da administração de Lula. A discussão e implementação de políticas de ação afirmativa no Brasil adquire maior visibilidade, especialmente após a 3ª Conferência Mundial contra o Racismo, Discriminação Racial, Xenofobia e Formas Correlatas de Intolerância, sob os auspícios da ON...

  14. El poshumanismo apocalíptico en la novela negra argentina contemporánea: Ciudad santa y 77 Apocalyptic Posthumanism in Contemporary Argentine Hardboiled: Ciudad santa and 77

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    Osvaldo Di Paolo

    2012-01-01

    Full Text Available El fin del mundo es un arquetipo milenario, el cual se ha acentuado en tiempos recientes. La obsesión actual con la destrucción del planeta también se evidencia en el género negro. Gran parte de la novela negra hispanoamericana del siglo XXI presenta una visión poshumanista y apocalíptica que revela la descentralización del individuo y manifiesta el caos, el miedo y el enfrentamiento de fuerzas opuestas que conllevan a la destrucción del género humano. Para demostrar mi tesis analizo dos novelas argentinas y ganadoras del Premio Hammett: Ciudad santa (2010 de Guillermo Orsi y 77 (2009 de Guillermo Saccomanno. De cada texto, presento un resumen general, extraigo las particularidades estructurales de la novela negra y revelo la tendencia poshumanista y apocalíptica inherente a los mismos, junto con sus implicaciones sociales.The end of the world is a millennial archetype, which has become quite popular in recent times. The current obsession with the destruction of the planet is also present in hard-boiled literature. A great number of the XXI Century hard-boiled genre presents a posthumanist and apocalyptic view that reveals the decentralization of man and manifests chaos, fear, and the clash of opposite forces that lead to the destruction of the human race. In order to prove my thesis, I analyze two argentine novels, winners of the Hammett award,: Ciudad santa (2010 by Guillermo Orsi and 77 (2009 by Guillermo Saccomanno. From each text, I present a summary of the story, draw the structural characteristics of the hard-boiled, and reveal the posthuman and apocalyptic tendencies in the novels, along with the social implications they convey.

  15. Evaluación de la tasa de consumo de oxígeno de Colossoma macropomum en relación al peso corporal y temperatura del agua

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    Dennis Tomalá

    2014-11-01

    Full Text Available Colossoma macropomum es una especie de la región amazónica perteneciente a la familia Characidae, la de mayor diversidad de peces de agua dulce. A nivel de laboratorio, se determinó la tasa de consumo de oxígeno (CO en metabolismo de rutina de C. macropomum a diferentes pesos corporales: 40, 60, 90, 140 y 250 g (expresados por unidad de masa corporal y temperatura del agua de 21, 26 y 31°C. El experimento se diseñó completamente al azar en arreglo factorial (5x3x3, utilizando un respirómetro de 20 L y una bomba de recirculación de agua. Las mediciones del CO fueron realizadas cada 5 min mediante el uso de un oxímetro digital. Los resultados indican que el CO mantiene relación directa con la temperatura del agua e inversa con el peso corporal de los organismos (P < 0,05. Las regresiones entre las variables independientes y el CO se ajustaron a ecuaciones potenciales: CO = 2844,9 P-0,734, CO = 2555,9 P-0,624 y CO = 1945,4 P-0,507 a 21, 26 y 31°C respectivamente; donde P se expresa en kg, obteniéndose altos coeficientes de correlación y determinación. La ecuación resultante del análisis multivariado de regresión lineal múltiple fue: CO = 4,839 - (0,708* P + (9,106* T. Los resultados ofrecen información para estimar la capacidad de un ambiente acuícola en base a la demanda de oxígeno de C. macropomum, aportando al desarrollo de una acuicultura con mayor sustento técnico.

  16. Características hematológicas de teleósteos brasileiros. I. Série vermelha e dosagens de cortisol e glicose do plasma sangüíneo de espécimes de Colossoma macropomum em condições de cultivo - DOI: 10.4025/actascibiolsci.v20i0.4466 Hematological characteristics of Brazilian teleosts. I. Red blood cell and doses of blood plasma cortisol and glucose in Colossoma macropomum species in culture condition - DOI: 10.4025/actascibiolsci.v20i0.4466

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    Marcos Tavares-Dias

    1998-07-01

    Full Text Available Foram utilizados no presente trabalho 30 exemplares sexualmente imaturos de Colossoma macropomum Cuvier, 1818 (Osteichthyes: Characidae com 500 a 700g de peso total e 25,0 a 30,2cm de comprimento padrão, com aproximadamente um ano de idade. Tais indivíduos foram capturados em tanques da Estação de Piscicultura Usina São Geraldo, Sertãozinho (São Paulo, Brasil, e são provenientes de uma mesma desova. Foram determinados os valores médio da contagem total de eritrócitos, da hemoglobina, do hematócrito, do volume corpuscular médio (VCM, da hemoglobina corpuscular média (HCM, da concentração da hemoglobina corpuscular média (CHCM e dosados a glicose e o cortisol plasmático. Os resultados demonstraram que a contagem total de eritrócitos em Colossoma macropomum foi igual a 2830,6 x 103/μl, percentual de hematócrito 41,6%, concentração da hemoglobina 11,3g/100ml, VCM 150,0%, HCM 41,4pg, CHCM 27,7%, glicemia 116,7mg/dl e cortisol plasmático igual a 182,1ng/ml. O número de eritrócitos apresentou correlação positiva (α=0,05 com a taxa de hemoglobina e correlação altamente positiva (α=0,01 com o percentual de hematócrito, enquanto a taxa de hemoglobina mostrou correlação altamente positiva (α=0,01 com o percentual de hematócrito.Thirty approximately one-year-old sexually immature specimens of Colossoma macropomum Cuvier, 1818 (Osteichthyes: Characidae, total weight 500 to 700g, 25,0 to 30,2cm in standard length were used in this research work. Specimens were captured from tanks of Usina São Geraldo Fish Farm, Sertãozinho (São Paulo State, Brazil and came from a single spawning. Average values for total count of erythrocytes, hemoglobin, hematocrit, mean corpuscular volume (MCV, mean corpuscular hemoglobin (MCH, mean corpuscular hemoglobin concentration (MCHC were determined. Plasma glucose and cortisol were dosed. Results showed that the total count of erythrocytes in Colossoma macropomum was 2830.6 x 103/

  17. Acessibilidade à atenção básica a famílias negras em bairro popular de Salvador, Brasil Acceso a la atención básica de familias negras en comunidad popular de Salvador, Brasil Accessibility to primary health care by black families in a poor neighborhood of Salvador, Northeastern Brazil

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    Leny Alves Bomfim Trad

    2012-12-01

    Full Text Available OBJETIVO: Analisar a acessibilidade de famílias negras de bairro popular aos serviços de atenção básica à saúde. MÉTODOS: Estudo etnográfico, ancorado na antropologia de base interpretativa, realizado com 18 famílias selecionadas de um bairro popular de Salvador, BA, no período de dois anos. Os critérios de inclusão foram residência no bairro e autoclassificação como negros. A análise se baseou na antropologia interpretativa e considerou as categorias: autorreferência étnico-racial; experiências de discriminação nos serviços; percepção sobre acessibilidade na atenção básica; e barreiras de acessibilidade. RESULTADOS E DISCUSSÃO: Identificaram-se os seguintes aspectos: a identidade étnico-racial e saúde: percepção dos usuários de que as barreiras organizacionais e de acesso se devem a um amplo contexto social que produz cidadãos "de primeira e de segunda categorias", mais do que a um racismo institucional; b acessibilidade no Sistema Único de Saúde (SUS: acesso problemático, permeado pela demora no atendimento, falta de compromisso dos profissionais de saúde, omissão dos gestores no controle e correção dessas situações; c acessibilidade na atenção básica: visão sobre o contexto mais geral do SUS e apoio na descrição dos entrevistados sobre o acesso aos serviços de atenção básica. CONCLUSÕES: Há barreiras de acessibilidade econômicas, organizacionais e culturais que se interpõem entre a oferta de serviços e o atendimento efetivo e oportuno das necessidades da população estudada.OBJETIVO: Analizar el acceso de familias negras de comunidad popular a los servicios de atención básica de salud MÉTODOS: Estudio etnográfico, basado en antropología de base interpretativa, realizado con 18 familias seleccionadas de una comunidad popular de Salvador, BA, Brasil, en período de dos años. Los criterios de inclusión fueron residencia en la comunidad y auto-clasificación como negros. El an

  18. Dilemas da cooperação: conflitos gerados pela política das "Listas Negras" no Brasil durante a Segunda Guerra Mundial Dilemmas of cooperation: the conflicts provoked by the policy of "Black Lists" in Brazil during World War II

    OpenAIRE

    Tania Quintaneiro

    2006-01-01

    No artigo são analisados os conflitos políticos gerados pela implementação das "Listas Negras" norte-americanas entre órgãos estatais e interesses privados no Brasil durante a Segunda Guerra Mundial.The article analyses the political conflicts caused by the implementation of American Black Lists between State agencies and private interests in Brazil during World War II.

  19. Discriminação racial e vulnerabilidade às DST/Aids: um estudo com adolescentes negras Racial discrimination and vulnerability to STD/AIDS: a study of black teenage girls in Rio de Janeiro

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    Stella R. Taquette

    2013-01-01

    Full Text Available O estudo teve como objetivo verificar a discriminação racial vivenciada por adolescentes negras moradoras em favelas da cidade do Rio de Janeiro e sua possível influência no processo de vulnerabilização ao HIV/Aids. Utilizou-se uma combinação de métodos, quantitativo e qualitativo. Este artigo se refere a um recorte da etapa qualitativa desenvolvida por meio de dez grupos focais com a participação de 139 adolescentes. Seguiu-se um roteiro para o debate contendo dois grupos temáticos: sexualidade/DST/Aids/gênero e raça/cor/discriminação. Os relatos foram gravados e o material transcrito organizado conforme os temas tratados e analisados criticamente por equipe multidisciplinar. Os dados coletados foram classificados em categorias específicas articuladas aos pressupostos teóricos, a fim de responder às questões formuladas, tendo por base os objetivos da pesquisa. Os resultados revelaram que as adolescentes negras sofrem discriminação racial no seu cotidiano, que é manifestada nas expressões de suas falas, referindo-se ao aspecto físico, ao caráter e à capacidade intelectual. Tais condutas discriminatórias dificultam o acesso aos serviços de saúde e induzem um atendimento de baixa qualidade. Concluiu-se que a discriminação racial vivida por estas adolescentes negras, na cidade do Rio de Janeiro, influencia o desenvolvimento da autoestima e contribui para a construção de uma identidade negativa que, aliada ao racismo e à pobreza, se configura num contexto de vulnerabilidade às DST/Aids. Sugere-se que estes dados sejam levados em consideração na elaboração de políticas públicas para que ofereçam atenção diferenciada àqueles que estão inseridos de forma desigual na sociedade.This study aimed to verify the racial discrimination experienced by black teenage girls living in shantytowns in Rio de Janeiro city and its possible influence on their vulnerability to HIV/AIDS. We used a combination of quantitative

  20. Características físico-quimicas, análise sensorial e conservação de frutos de cultivares de bananeira resistentes à sigatoca-negra

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    Célia Lúcia Siqueira

    2010-10-01

    Full Text Available O cultivar Prata Anã é o mais plantada no Norte de Minas Gerais, o que demonstra estar a bananicultura regional baseada numa variedade suscetível à sigatoca-negra. Apesar de existirem cultivares resistentes em fase de recomendação para o cultivo na região, ainda são escassos os trabalhos relacionados a metodologias de conservação pós-colheita. Assim, o objetivo deste trabalho foi avaliar o período de armazenamento e as características físico-químicas e sensoriais dos cultivares de bananeira Fhia - 02 e Precioso, ambos resistentes à sigatoca-negra, e o efeito da atmosfera modificada associada à refrigeração. Foram realizados três experimentos, o primeiro em temperatura ambiente, o segundo a 12 ºC e o terceiro a 15 ºC. Esses experimentos foram instalados no delineamento em blocos casualizados em esquema de parcelas subdivididas no tempo, tendo nas parcelas um fatorial 2 (com e sem embalagem x 2 (Fhia - 02 e Precioso e nas subparcelas as avaliações em intervalo de seis e dois dias para frutos armazenados nas temperaturas de 12, 15 e 25 ºC, com quatro repetições e três frutos por unidade experimental. Após o tratamento, os frutos foram dispostos em bandejas de poliestireno expandido (sem embalagem e embalagens de 10 e 16 µm e umidade relativa de 90%. As características avaliadas foram: tamanho, diâmetro, cor, firmeza, perda de matéria fresca, sólidos solúveis totais (SST, acidez total titulável (ATT, SST/ATT, pH e análise sensorial. O uso da embalagem associada à refrigeração permitiu armazenar os frutos por 28 dias, mantendo as características físico-químicas.

  1. Determinação do índice de rigor-mortis e sua relação com a degradação dos nucleotídeos em tambaqui (Colossoma macropomum), de piscicultura e conservados em gelo Determination of the rigor-mortis index and its relation with rate decrease nucleotides of a cultivated amazonian fish

    OpenAIRE

    Neiva Maria de Almeida; Gilvan Machado Batista; Makie Kodaira; Luís Adalberto Val; Edson Lessi

    2005-01-01

    Este trabalho teve a finalidade de determinar o índice de rigor-mortis e sua relação com a taxa de degradação dos nucleotídeos do tambaqui (Colossoma macropomum) cultivado e conservado em gelo. O início da rigidez (IR) muscular para o pescado ocorreu 20 minutos (IR=80,1%) após a morte por asfixia entre camadas de gelo. A contração total ocorreu aos 30 minutos (IR=99,4%) e a resolução total do rigor cerca de 360 horas (15 dias). A concentração de ATP diminuiu cerca de 50% aos 20 minutos. Aos 3...

  2. Determinação do índice de rigor-mortis e sua relação com a degradação dos nucleotídeos em tambaqui (Colossoma macropomum), de piscicultura e conservados em gelo

    OpenAIRE

    Almeida Neiva Maria de; Batista Gilvan Machado; Kodaira Makie; Val Luís Adalberto; Lessi Edson

    2005-01-01

    Este trabalho teve a finalidade de determinar o índice de rigor-mortis e sua relação com a taxa de degradação dos nucleotídeos do tambaqui (Colossoma macropomum) cultivado e conservado em gelo. O início da rigidez (IR) muscular para o pescado ocorreu 20 minutos (IR=80,1%) após a morte por asfixia entre camadas de gelo. A contração total ocorreu aos 30 minutos (IR=99,4%) e a resolução total do rigor cerca de 360 horas (15 dias). A concentração de ATP diminuiu cerca de 50% aos 20 minutos. Aos 3...

  3. Mulheres negras: uma trajetória de criatividade, determinação e organização Black women: a trajectory of creativity, determination and organization

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    Matilde Ribeiro

    2008-12-01

    Full Text Available Este artigo busca fazer um breve registro focando o processo organizativo das mulheres negras em diálogo com: a inclusão de gênero e raça nas políticas públicas; a realização das conferências internacionais - em especial a Conferência Mundial sobre as Mulheres e a III Conferência Mundial contra o Racismo, a Discriminação Racial, a Xenofobia e as Formas Conexas de Intolerância; o pós-Durban, a ação e o monitoramento; e os 120 anos após a abolição da escravidão. Ao final, são formulados alguns desafios a considerar na luta pela igualdade e justiça social.The article "Black Women: A Trajectory of Creativity, Determination and Organization" seeks to make a brief account, focusing on the process of black women's organization in dialogue with the following: the inclusion of gender and race in public policies; the holding of International Conferences - in particular, the World Conference on Women and the 3rd World Conference against Racism, Racial Discrimination, Xenophobia and Related Intolerance; the Post-Durban period: action and monitoring; and the 120 years since the abolition of slavery. Lastly, some challenges are formulated as to the struggle for equality and social justice.

  4. Effect of gender on growth performance, carcass characteristics and meat and fat quality of calves of Avileña-Negra Ibérica breed fattened under free-range conditions

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    Argimiro Daza

    2014-07-01

    Full Text Available The effect of gender (entire males vs females on growth performance, carcass traits and meat and fat quality of Avileña-Negra Ibérica calves, fattened under free range conditions and supplemented with concentrate, were investigated. The average daily gain, leg width and thorax depth were higher in males than in females. Carcass conformation score, fore-quarter weight and percentage in carcass were higher in males than in females, whereas dressing percentege, loins and flank percentages in carcass and carcass fatness degree were higher in females than in males. Instrumental colour variables of muscle were not affected by gender at days 1, 3, 7 and 9 of refrigerated storage. In muscle, the L*, a*, b*, chroma, oxymyoglobine and oxymyoglobine/metmyoglobine ratio values observed 9 days after slaughter were lower than those at days 1 and 3 after slaughter. Intramuscular fat percentage of Longissimus thoracis muscle was higher in females than in males. Gender had no effect on α-tocopherol content in intramuscular fat (IMF from Longissimus thoracis muscle. The omental and IMF of females had lower C18:2 n-6, Σ n-6 and Σ PUFA proportions than those from the males. In IMF C16:1, C18:1 n-9 and Σ MUFA proportions were greater in females than in males. The IMF percentage in Longissimus thoracis affected significantly to its fatty acid composition.

  5. INDUCCIÓN SINCRÓNICA DEL CICLO ESTRAL EN LA GUAGUA NEGRA (Agouti taczanowskii EN CAUTIVERIO SYNCHRONOUS INDUCTION OF THE ESTRAL CYCLE IN THE BLACK GUAGUA (Agouti taczanowskii IN CAPTIVITY

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    Luis Emilio Trujillo Aramburo

    2006-06-01

    Full Text Available Para la inducción y sincronización del ciclo estral en la guagua negra Agouti taczanowskii en cautiverio, se aplicó a cada una de seis hembras, con edades entre cuatro y siete años, un cuarto de dosis de norgestomet y 1,25 mg de valerato de estradiol. A partir del día de la aplicación del implante se les realizó medición del diámetro del orificio vulvar tres veces por semana hasta el día 52 y con igual frecuencia, a partir del día del retiro del implante, se realizó muestreo sanguíneo para determinar los niveles de progesterona por radioinmunoanálisis. El tratamiento hormonal indujo y sincronizó el ciclo estral en tres de las seis hembras tratadas, las cuales presentaron aumento en los niveles de progesterona ³ 10 ng/ml precedidos de apertura del orificio vulvar. El ciclo estral inducido tuvo una duración variable entre 11 y 29 días. El ciclo estral espontáneo que se presentó después del inducido con el tratamiento hormonal, presentó duración variable entre 10 y 30 días. Durante el tiempo de experimentación se presentó una correlación negativa entre los niveles de progesterona y el diámetro de la apertura vulvar. Se concluye que la aplicación de un implante de norgestomet acompañado de una inyección de valerato de estradiol puede inducir y sincronizar el ciclo estral en la guagua negra.To induce and synchronize the estral cycle in the black guagua Agouti taczanowskii in captivity, each of six females varying from four to seven years of age were implanted with a quarter dose of norgestomet and injected with 1,25 mg of estradiol valerate. Starting on the day of the application of the implant, the diameter of the vulvar orifice was measured three times per week until day 52, and with same frequency beginning on the day the implant was removed, blood sampling was conducted to determine progesterone levels for radioimunoassay. The hormonal treatment induced and synchronized the estral cycle in three of the six treated

  6. Produção Arbórea e Animal em Sistema Silvipastoril com Acácia-negra (Acacia mearnsii Trees and Animal Production in a Silvipastoral System with Black Wattle (Acacia mearnsii

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    Zelia Maria de Souza Castilhos

    2010-02-01

    Full Text Available

    Com o objetivo de avaliar o desempenho dos componentes arbóreo e animal em um sistema silvipastoril (SSP com acácia-negra (Acacia mearnsii De Wild e gramíneas perenes de verão, foi conduzido um trabalho em convênio com a empresa Seta S.A., na unidade da Fepagro em Tupanciretã, RS, no período de outubro de 1995 a maio de 2003. O delineamento experimental foi um bifatorial (espécie forrageira e densidade arbórea inteiramente casualizado, com duas repetições. As espécies forrageiras (EF avaliadas foram capim annoni (Eragrostis plana, braquiária (Brachiaria brizantha e capim gatton (Panicum maximum cv. Gatton nos quatro primeiros anos, e capim gatton, capim aruana (P. maximum cv. Aruana e capim pangola (Digitaria diversinervis para os demais anos. As densidades arbóreas (DA testadas foram de 1.667, 1.000, 833 e 500 árvores.ha-1. Com 1.667 árvores.ha-1 houve maior rendimento de madeira em todas as avaliações, não diferindo de 1.000 árvores/ha-1 a partir do quinto ano. A produtividade animal foi mais elevada em DA de 833 e 500 árvores.ha-1, sendo respectivamente 229 e 223 kg.ha-1 de peso vivo. Aos sete anos de implantação da acácia negra, o volume de madeira foi de 166; 143; 86 e 51 m3.ha-1, respectivamente, nas densidades arbóreas de 1.667; 1.000; 833 e 500 árvores.ha-1. Para que haja um equilíbrio entre produção arbórea e animal, SSPs com densidades arbóreas entre 1.000 e 833 árvores.ha-1 apresentam-se como alternativas viáveis para os produtores rurais.

     

    doi: 10.4336/2009.pfb.60.39

    A silvopastoral study consisting of black wattle (Acacia mearnsii De Wild and tropical perennial grasses was developed at the Fepagro Research Unity in Tupanciretã, RS, in collaboration with Seta Group, from October 1995 until May 2003, with the objective of evaluating trees and animal (beef cattle performances. The experiment was a bifactorial completely randomized design (forage specie and arboreal density with two

  7. Interseccionalidade de gênero, classe e raça e vulnerabilidade de adolescentes negras às DST/aids Intersectionality of gender, class and race, and vulnerability of black female adolescents to STD/AIDS

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    Stella R. Taquette

    2010-12-01

    Full Text Available OBJETIVO: verificar a vulnerabilidade ao HIV/aids de adolescentes femininas moradoras de favelas da cidade do Rio de Janeiro. MÉTODO: foi utilizada uma combinação de métodos, quantitativo e qualitativo. Na etapa quantitativa, realizou-se um estudo observacional de corte transversal por meio de entrevistas e exames clínico/laboratoriais para diagnóstico de DST, e, na qualitativa, desenvolveram-se grupos focais sobre os temas sexualidade, gênero e raça. RESULTADOS: foram entrevistadas 816 adolescentes de 10 diferentes comunidades, com um grupo focal em cada favela: 74% eram negras, 39% eram sexualmente ativas e destas 24,4% eram portadoras de DST. Houve uma relação estatisticamente significativa entre a variável raça/cor negra e a atividade sexual. Na fase qualitativa, evidenciou-se que a discriminação racial sofrida é cotidiana e contribui para a construção de autoimagem negativa que aliada a pobreza, violência de gênero e dificuldade de acesso aos serviços de saúde ampliam a vulnerabilidade às DST/aids. CONCLUSÃO: o estudo sugere a criação de políticas que proporcionem o aumento da oferta de serviços de atendimento ginecológico a esse público, com ações que favoreçam a utilização de preservativo feminino e contribuam para reduzir a desigualdade social, de gênero e de raça.OBJECTIVE: To verify the vulnerability to HIV/AIDS of female adolescents that live in poor communities of the city of Rio de Janeiro. METHODS: It was carried out with quantitative and qualitative analyses. The quantitative phase was a cross-sectional study, through interviews of 816 adolescents and clinical/laboratory tests in ten different slums, and the qualitative phase was done on one focus group about sexuality of gender and race in each community. RESULTS: 74% of the adolescents were black, 39% had sexual activity and 24.4% of those had STD. A statistical significant association occurred between the black color/race and sexual activity

  8. Controlled Rhizogenesis and Mycorrhization of Hazelnut (Corylus avellana L. Cuttings with Black Truffle (Tuber melanosporum Vitt. Rizogénesis y Micorrización Controlada de Estacas de Avellano Europeo (Corylus avellana L. con Trufa Negra (Tuber melanosporum Vitt.

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    Rómulo Santelices

    2010-06-01

    Full Text Available Hazelnut (Corylus avellana L. is commonly used as mycorrhizal host for Tuber melanosporum Vitt. (black truffle. Black truffle orchards have been established in and outside its natural distribution area, currently also in Chile. Hazelnut can be propagated rapidly by cuttings, which, however, may not easily form mycorrhizal symbiosis under laboratory conditions. We successfully inoculated hazelnut cuttings with T. melanosporum and studied the effects of culture conditions, plant material and inoculum age on rhizogenesis and mycorrhization. Cuttings from sucker shoots showed the highest rooting rate (88.5%. Perlite and vermiculite as substrate increased root length (9.6 cm . Treatment with auxin significantly increased root yield (up to 27 roots per cutting. Larger containers increased the mycorrhization rate (33.6%. Up to 2 year storage of sporal inoculum did not affect mycorrhization. We conclude that root induction in C. avellana cuttings and mycorrhization with black truffle using up to 2-yr-old inoculum, do not present problems when performed under optimized conditions, allowing fast production of plants for commercial and reforestation purposes.El avellano europeo (Corylus avellana L. es uno de los simbiontes más comunes utilizados para inocular plantas con Tuber melanosporum Vitt. (trufa negra. Los huertos truferos han sido establecidos tanto dentro como fuera del área de distribución natural de este hongo micorrizógeno, actualmente también en Chile. El avellano europeo puede propagarse rápidamente por estacas. Sin embargo, no es fácil el desarrollo de órganos micorrícicos bajo condiciones de laboratorio. En este estudio se inocularon exitosamente estacas de avellano europeo con T. melanosporum y se estudió el efecto de algunos tratamientos culturales, del material vegetal y tiempo de almacenamiento del inóculo, en el proceso de rizogénesis y micorrización. Las estacas provenientes de chupones tuvieron una mayor capacidad de

  9. AVALIAÇÃO SÓCIO-AMBIENTAL EM COMUNIDADES RECEPTORAS: UMA CONTRIBUIÇÃO AO ESTUDO DOS IMPACTOS DA ATIVIDADE TURÍSTICA NA VISÃO DOS MORADORES DA VILA DE PONTA NEGRA, NATAL/RN

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    Aline Gisele Azevedo Lima

    2008-05-01

    Full Text Available O presente trabalho teve como objetivo investigar os impactos sócio-ambientais advindos da atividade turística a partir da visão de uma comunidade receptora. Para tanto, foram enfocados aspectos ambientais, sociais, econômicos, além de apresentar o desenvolvimento sustentável no turismo, conceitos de indicadores e modelos de métodos de avaliação sócio-ambiental como forma de incrementar a avaliação proposta neste estudo. Foi realizada uma pesquisa amostral do tipo Survey com 100 habitantes da Vila de Ponta Negra, uma comunidade inserida em uma das principais regiões da atividade turística da cidade do Natal, capital do Estado do Rio Grande do Norte, e que consequentemente vem sofrendo com os impactos do crescimento desta atividade. O instrumento de pesquisa utilizado foi o formulário, estruturado com perguntas abertas e fechadas. O método de coleta de dados foi a entrevista pessoal. Os resultados mostram que a população estudada percebe que a educação, o emprego, a distribuição de renda e o lazer, possuem uma relação direta com os benefícios sociais advindos do turismo. Entretanto, não percebem uma relação no que se refere à saúde e a qualidade de vida. Já aspectos como impactos ao meio ambiente, prostituição, criminalidade e violência, são percebidos, na visão da comunidade, como problemas, mas que não influenciam diretamente na geração de benefícios sociais para a comunidade. PALAVRAS-CHAVE: Turismo, Impactos sócio-ambientais, Avaliação.

  10. A MULHER NEGRA E AS RELAÇÕES DE GÊNERO EM MENINO DE ENGENHO DE JOSÉ LINS DO REGO THE BLACK WOMAN AND GENDER RELATIONS IN MENINO DE ENGENHO BY JOSÉ LINS DO REGO

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    Zélia Monteiro Bora ; Marina Rodrigues de Oliveira

    2011-02-01

    Full Text Available Os romances do ciclo da cana-de-açúcar, do escritor paraibano José Lins do Rego (1901-1957 e a sua relação com a sociedade e a cultura destacam-se enquanto abordagens ficcionais, através das quais o escritor buscou representar aspectos relevantes para o entendimento das relações de gênero no Nordeste, no começo do século vinte. Tal representação, indiscutivelmente, reflete a perspectiva de um narrador profundamente marcado pelo lugar privilegiado de onde narra e de sua condição existencial, como o neto de um senhor de engenho. Diante desses aspectos, propomo- nos a analisar brevemente as implicações dessa perspectiva sobre a construção simbólica da personagem negra representada no romance. Para tanto, serão utilizados como referenciais críticos, além do citado romance, os estudos de Zagury (1982, Albuquerque Jr. (1999, Azevedo (1996, 2007, Freyre (2006 Chaguri (2009, Schwarz (2008 e Raboni (2010.The so called sugar cane cycle novels by the Parahyban writer Jose Lins do Rego (1901-197 and its relationship with society and culture constitute themselves as fictional approaches through which the writer sought to represent aspects to the understanding of gender relations in the Northeast of Brazil in the early twentieth century. Such representation, undoubtedly reflects the perspective of a narrator deeply marked by the privileged place from which he narrates and his existential condition, as the son of a plantation owner. Given these aspects, we propose to examine briefly the implications of his perspective on the symbolic construction of the black woman characteres represented in the novel. The following

  11. Lutitas negras lacustres cercanas al límite Paleógeno-Neógeno en la región noroccidental de la provincia del Neuquén: Evidencias palinológicas

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    H. A. Leanza

    2002-09-01

    Full Text Available Se muestrearon con fines palinológicos sedimentitas lacustres referidas a la Formación Lileo nov. aflorantes en las cercanías de la localidad de Los Miches, en el noroeste de la provincia del Neuquén, República Argentina. Sobre la base del análisis microflorístico las capas portadoras de palinomorfos pueden asignarse al Oligoceno Tardío - Mioceno Temprano. Las rocas muestreadas se caracterizan por lutitas negras, gris verdosas, gris oscuras y castaño claras, alternando con niveles delgados, a veces oolíticos de calizas gris claras, con superficie de meteorización blanco amarillenta. Entre estas sedimentitas se intercalan andesitas, tobas y aglomerados volcánicos de composición mesosilícica. En los afloramientos del área del río Guañacos se observan capas irregulares de carbonato fibroso tanto como baritina nodular con estructura fibroradial, junto con bivalvos indeterminados de agua dulce. La asociación microflorística muestra relativamente baja diversidad. En general, el género Nothofagidites domina la asociación. Los componentes principales de la microflora consisten en granos de polen pertenecientes a varios taxones de angiospermas, tales como Baumannipollis sp. cf. B. variaperturatus, Corsinipollenites atlantica, Milfordia sp., Nothofagidites saraensis, Smilacipites sp. cf. S. echinatus and Tricolpites asperamarginis junto con granos de polen de angiospermas de Araucariacites australis, Equisetosporites notensis y Podocarpidites spp. Los elementos de Pteridophyta/Bryophyta están representados por Cyatheacidites annulatus, Cicatricosisporites sp., Deltoidospora sp., Lycopodiumsporites austroclavatidites, Ricciaesporites sp. y Laevigatosporites ovatus, mientras que entre los taxones lacustres se reconocieron Azolla sp. y Botryococcus sp. (Chlorophyta.

  12. La medición y vigilancias de la enfermedad de la mancha foliar producida por la sigatoka negra (Mycospharella fijiensis var diformis Morelet) en la producción de musáceas: un enfoque para lograr la sostenibilidad del desarrollo

    OpenAIRE

    Edgardo Vargas Jarquín

    2013-01-01

    En el presente trabajo se discute la necesidad de utilizar tecnología, como el procesamiento digital de imágenes para mejorar los procesos de medición y vigilancia de la enfermedad de la mancha de la hoja causada por SIGATOKA NEGRA (Mycospharella fijiensis var diformis Morelet), pero partiendo de un análisis epistemológico que fundamenta al desarrollo sostenible, que es el marco dentro del cual se encuentra sentido a la aplicación de esta tecnología. Así se define que es la gobernabilidad ben...

  13. Cuando la música popular era un problema político : Darío Marchini, No toquen. Músicos populares, gobierno y sociedad/ utopía, persecución y listas negras en la Argentina 1960- 1983,Edit. Catálogos, Buenos Aires, 2008.

    OpenAIRE

    Palazzolo, Fernando

    2010-01-01

    ¿Cuál es el lugar que tiene la música popular hoy en las dinámicas culturales, sociales y políticas en Argentina? No es ésa la pregunta que se hace Darío Marchini, y en ese sentido no es más que un cebo para la lectura, pero quizás sí es un interrogante que el lector puede proponerse al recorrer las historias que forman No toquen. Músicos populares, gobierno y sociedad/ utopía, persecución y listas negras en la Argentina 1960-1983.

  14. Contenido de alimento y metabolismo ceco-cólico en el tracto digestivo de poblaciones silvestres de iguana negra (Ctenosaura pectinata) en Morelos, México Cecum-colic content of food and metabolism in the digestive tract of wild population black lizard (Ctenosaura pectinata) in Morelos, Mexico

    OpenAIRE

    L Vélez-Hernández; MA Cobos-Peralta; JL Arcos-García

    2012-01-01

    Se colectaron cinco tractos digestivos de iguana negra (Ctenosaura pectinata) en estado silvestre en el estado de Morelos, México, para conocer la composición botánica de la dieta y el metabolismo ceco-cólico. Se observaron frotis realizados del contenido ceco-cólico para registrar la presencia de protozoarios, bacterias y parásitos intestinales existentes. Se obtuvo la media y desviación estándar de las características evaluadas. En el contenido ceco-cólico se identificaron las especies vege...

  15. Hydrocarbons prospecting using an integrated approach of petrography, geochemistry and modeling of organic matter transformation. Analysis and reconstitution of the thermal history of the central carboniferous basins of Asturias (Spain) and of the Sabinas - Piedras Negras basin (Coahuila, Mexico); Prospection des hydrocarbures par une approche integree de petrographie, geochimie et modelisation de la transformation de la matiere organique. Analyse et reconstitution de l'histoire thermique des Bassins Carbonifere Central des Asturies (Espagne) et Sabinas - Piedras Negras (Coahuila, Mexique)

    Energy Technology Data Exchange (ETDEWEB)

    Piedad-Sanchez, N.

    2004-09-01

    Solid knowledge of the transformation and evolution of organic matter during hydrocarbon generation in sedimentary basins serves to improve natural gas exploration. With this geological problem in mind, the thermal influence on organic matter was analyzed in two basins containing different characteristics (age, composition of organic matter, litho-stratigraphy, depth, thickness of the layers of rock, the maturation of organic matter, etc.) in order to understand the natural processes in generating oil and natural gas. With a view to studying this geological phenomenon, this work outlines the study of the chemical and macerals composition, the coal rank and geochemical characteristics of organic matter in these two sedimentary basins for the first time: The Asturian Central Carboniferous Basin (Spain) and Sabinas - Piedras Negras Basin (Mexico). Moreover, an approach to shed light on the thermal history and evolution of organic matter through 1D modeling in the two basins is developed. The Central Carboniferous Basin in Asturias is an important coal mining area where coal types range from bituminous carbons with high content in volatile matter to anthracite. The petrographical and geochemical study in this region has shown that at the moment of oil and gas exploration, the coals correspond to an efficient expulsion of oil and have been formed in an environment of swamp with a facies rich in vitrinite, low in sulfur and ash and varying in mineral content. As regards the paleo-environmental reconstruction, the bio-markers suggest a swamp with a relatively high water table and a humid climate. The coal type, the vitrinite reflectance and the volatile matter content in the basin show a N-S trend which could be correlated to the paleo-temperatures calculated in this study. These data point to the influence of two thermal gradients in the region: A normal thermal gradient of long duration and an oblique thermal gradient of short duration due to a pluton. The evolution of

  16. Distribuição do sistema radicular de árvores de acáia-negra oriundas de mudas produzidas em diferentes recipientes Influence of seedling production method on the root system distribution of black wattle trees

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    Aline Fagote Paulino

    2003-10-01

    Full Text Available O objetivo deste trabalho foi estudar a distribuição do sistema radicular de árvores de acácia-negra (Acacia mearnsii com 3 anos de idade, provenientes de mudas formadas em diferentes recipientes e instaladas em um Argissolo no Rio Grande do Sul. Os recipientes utilizados foram: laminado, tubete redondo e bandeja de isopor. As avaliações da distribuição das raízes foram feitas pelo método da parede do perfil até 1 m de profundidade, na linha e na entrelinha de plantio. Foram feitas, também, análises físicas do solo: densidade, porosidade total e distribuição de poros. O recipiente usado na formação da muda influenciou o crescimento do sistema radicular da planta no campo. O laminado de madeira apresentou-se superior ao tubete quanto ao comprimento de raízes nas linhas de plantio. As raízes cresceram melhor nas linhas de plantio, onde as condições de densidade e porosidade do solo se encontravam mais adequadas.The purpose of this study was to evaluate the root system distribution of three-year-old black wattle (Acacia mearnsii trees. The plants were originated from seedlings grown in different containers and planted in an Argisol in the state of Rio Grande do Sul, Brazil. The containers used for seedling production were: wood laminated pots, round plastic tubettes and styrofoam trays. The evaluations were carried out using the trench profile method up to 1 m depth on tree rows and inter-rows. The following soil analyses were also carried out: bulk density, total porosity and pore distribution. The type of container used influenced the development of the root system of trees on the field. Wood laminated pots were better than the round tubettes for root length in the tree rows. The roots developed better on the tree rows where soil density and porosity conditions were more adequate.

  17. Lepidopterismo por Hylesia Nigricans (mariposa negra: Investigación y acción preventiva en Buenos Aires Lepidopterism due to the butterfly Hylesia nigricans: Preventive research-intervention in Buenos Aires

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    Ascar D. Salomón

    2005-06-01

    Full Text Available En el barrio El Pato, municipio de Berazategui, provincia de Buenos Aires, se realizó una investigación-acción preventiva contra la «mariposa negra» Hylesia nigricans, luego del aumento de consultas espontáneas por dermatitis inespecífica. La incidencia pre-intervención, durante el verano del año 2001, se estimó mediante una encuesta semiestructurada. En noviembre de 2002 se roció con Bacillus thuringiensis el arbolado público, evaluándose su efecto insecticida en campo y en laboratorio. El impacto se estimó mediante una encuesta post-intervención en marzo de 2002. La distribución por edad, signos clínicos, persistencia (11 días y estacionalidad de los casos (enero-febrero 2001 fue consistente con dermatitis por H. nigricans. La mortalidad de larvas a las 96 horas del rociado fue del 100%. Las tasas de incidencia de dermatitis antes y después de la intervención fueron de 10.3% y 1.8% respectivamente. La acción coordinada de agentes nacionales, provinciales y locales permitió identificar el problema, diseñar investigaciones operacionales, y aplicar una estrategia de control preventivo, transferible por sus mismos efectores a la comunidad.A preventive research-intervention against the butterfly Hylesia nigricans was performed after an increase in spontaneous reports of nonspecific dermatitis in El Pato neighbourhood, Berazategui County, Buenos Aires Province. The overall pre-intervention incidence was estimated with a semistructured questionnaire carried out during March 2001. The trees in the street were sprayed with Bacillus thuringiensis, and the insecticide effect was evaluated both in the field and in the laboratory (November 2002. The impact was estimated with a post-intervention questionnaire during March 2002. The age distribution, clinical appearance, persistence (11 days and seasonality (January-February 2001 of the cases were consistent with dermatitis due to H. nigricans. The mortality of larvae 96 h after the

  18. Obtención simultánea de ferroaleación multicomponente y escoria a partir de arenas negras, para el desarrollo de consumibles de soldadura por arco eléctrico

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    Quintana-Puchol, R.

    2004-08-01

    Full Text Available In this paper, chemical and mineralogical characterizations of the black sands of the Mejias placer of Sagua de Tánamo (the most important beach littoral placer of the northwest of oriental Cuba are exposed. Starting from these characterizations a calculation strategy is developed for the making of the metallurgical load that allows to obtain simultaneously, when processed by carbothermic reduction in an electrical arc furnace, a multicomponent ferroalloy and a useful slag for the making of electric arch welding consumables. The powder of the obtained slag is agglomerated with liquid glass. The resulting pellets, due to their behavior on the submerged arc welding (SAW present technological and metallurgical properties that correspond with the requirements of an agglomerated flux matrix. The chemical composition of the multicomponent ferroalloy is constituted by metallic elements of high metallurgical and alloyed values (V, Cr, Mo, Ti, Nb. It is appropriate for the formulation of consumables for manual welding (SMAW and SAW, as well.

    En este trabajo se expone una caracterización química y mineralógica de las arenas negras del placer Mejías de Sagua de Tánamo, el más importante placer litoral de playa del noroeste de Cuba Oriental. A partir de estas caracterizaciones se desarrolla una estrategia de cálculo para la confección de la carga metalúrgica, que permite obtener, simultáneamente, al ser procesada por reducción carbotérmica en un homo de arco eléctrico, una ferroaleación multicomponente y una escoria útil para la confección de consumibles de soldadura por arco eléctrico. El polvo de la escoria obtenida se aglomera con vidrio líquido. Los pelets resultantes y su comportamiento en la soldadura automática por arco sumergido (SAW, presentan propiedades metalúrgicas y tecnológicas que satisfacen los requisitos de una matriz de un fundente aglomerado. La composición química de la ferroaleación multicomponente est

  19. Descubren el origen de las "galaxias negras"

    CERN Multimedia

    2007-01-01

    A group of researchers from Zurich University think having discovered the origin of the "black galaxies", things not well known, with the size of a galaxy with few or no stars and formed by dark matter, dust and gas. (1/2 page)

  20. El alma negra del caribe colombiano

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    Cristian Manuel Olivero

    2014-02-01

    Full Text Available Cuando se habla del caribe y de la America Latina, en general suele recurrirse a la formula que dice que somos una mezcla de blancos indios y negros.  otros lugares comunes aparecen enseguida para relacionar lo que se llama el legado europeo, con el idioma, la religion, la economia, la politica lo que en algun gran politico de oficio colombiano llamo lo fundamental al tiempo en la contribucion.

  1. Bajo la Luz de una Estrella Negra

    OpenAIRE

    Rey, Esteban

    2011-01-01

    Desde la práctica de la programación computacional, entendida como escritura de acción, se propone este ensayo de corpografía y fotografía. Del pensamiento como sombra que retarda la luz. Sea éste un libro de fotografías, la mayoría a color, las otras en el blanco y el negro de quien cuenta un cuento. Sea ésta una cuenta que no termina, un juego de espejos. Sea pues el fin de los medios del fin. Al final del periodo académico, preguntóle un niño al otro, ¿entonces, de qué era esa clase? —Era ...

  2. Epidemiologia comparativa da podridão negra e da alternariose do repolho no Agreste de Pernambuco Comparative epidemiology of black rot and Alternaria black spot of cabbage in the Agreste of Pernambuco

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    SIMONE S. AZEVÊDO

    2002-02-01

    Full Text Available A podridão negra causada por Xanthomonas campestris pv. campestris, e a alternariose causada por Alternaria brassicicola constituem importantes doenças do repolho no estado de Pernambuco. Em virtude do desconhecimento sobre a epidemiologia dessas doenças a nível regional, foi efetuada a análise comparativa das epidemias com ênfase nos aspectos temporais e espaciais, em 1997 e 1998, cada ano em uma área de plantio diferente, localizadas no município de Camocim de São Félix, Agreste de Pernambuco. Em cada área, a intervalos semanais, foram avaliadas 1.920 plantas quanto à incidência e severidade das duas doenças, bem como efetuado o mapeamento espacial de plantas assintomáticas e sintomáticas. Os valores iniciais (y o e máximos (y max de incidência e severidade, as taxas estimadas de progresso da doença (k e as áreas abaixo das curvas de progresso das doenças (AACPD, apresentaram pequena variação entre as doenças, sendo as diferenças mais evidentes entre os anos de plantio. As maiores intensidades das doenças foram observadas em 1998, uma vez que próximo à área de plantio havia grande quantidade de plantas e restos culturais infetados, o que não ocorreu em 1997. Pelas análises de "ordinary runs", ajuste à distribuição beta-binomial e autocorrelação espacial, na maioria das situações, foi constatado um arranjo aleatório de plantas doentes nas avaliações iniciais, evoluindo posteriormente para um arranjo agregado, indicando que as doenças podem ter sido originadas de aloinfecções pela chegada de inóculo externo, seguidas de autoinfecções decorrentes da disseminação planta-a-planta.The black rot caused by Xanthomonas campestris pv. campestris and Alternaria black spot caused by Alternaria brassicicola are significant cabbage diseases in the State of Pernambuco, Brazil. A lack of knowledge on the epidemiology of these diseases at a regional level motivated a comparative analysis of the epidemics in

  3. Eficacia de tres estrobilurinas para el control de mancha rojiza (Guignardia mangiferae y mancha negra (Guignardia citricarpa en frutos de limón, en Tucumán, República Argentina Efficiency of three strobilurins to control reddish spot (Guignardia mangiferae and black spot (Guignardia citricarpa in lemon fruits in Tucumán, Argentina

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    Gabriela M. Fogliata

    2011-06-01

    Full Text Available La Argentina lidera la producción e industrialización mundial de limón. Tucumán produce el 87% del total nacional, destinando 65% para su industrialización y 35% para su comercialización como fruta fresca, principalmente en exportaciones. Para ello, se requieren frutos de calidad y libres de enfermedades, especialmente de aquellas causadas por patógenos considerados cuarentenarios en los mercados de destino. En Tucumán, están presentes la mancha negra de los cítricos, causada por Guignardia citricarpa (Phyllosticta citricarpa, patógeno cuarentenario para importantes mercados consumidores, y en mayor prevalencia, la mancha rojiza o moteado, causada por G. mangiferae (P. capitalensis, hongo no cuarentenario. Ambas enfermedades se controlan con fungicidas cúpricos, estrobilurinas, mancozeb y bencimidazoles. Se realizaron cinco ensayos para evaluar la eficacia de tres estrobilurinas, azoxistrobina, pyraclostrobin y trifloxistrobin, para controlar mancha rojiza (campañas 2004/2005, 2005/2006 y 2006/2007 y mancha negra (2007/2008 y 2008/2009 en frutos de limón en Tucumán. Se realizaron una y dos aplicaciones de estrobilurinas con oxicloruro de cobre, en un esquema de cuatro y cinco aplicaciones de cúpricos, cada treinta días desde caída de pétalos. Se utilizaron tratamientos con oxicloruro de cobre solo o en mezcla con mancozeb, como testigos químicos. Se evaluó la incidencia de las enfermedades en julio y se calculó la eficacia de los tratamientos. Los más eficaces para controlar mancha negra y mancha rojiza fueron los que incluyeron una o dos aplicaciones de estrobilurinas, sin diferencias entre sí, superando al cúprico e igualando o superando a la mezcla cúprico-mancozeb. Estos resultados demostraron la eficacia de las estrobilurinas para controlar mancha negra y mancha rojiza en frutos de limón.Argentina leads lemon world production and industrialization. The province of Tucumán generates 87% of national production

  4. Levantamento da intensidade da alternariose e da podridão negra em cultivos orgânicos de brássicas em Pernambuco e Santa Catarina Survey of the intensity of Alternaria black spot and black rot on brassica species under organic farming systems in Pernambuco and Santa Catarina states, Brazil

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    Luiz A M Peruch

    2006-12-01

    Full Text Available O objetivo deste trabalho foi avaliar a intensidade da alternariose, causada por Alternaria brassicicola e/ou Alternaria brassicae, e da podridão negra, causada por Xanthomonas campestris pv. campestris, em cultivos orgânicos de brássicas em Pernambuco e Santa Catarina. Os levantamentos foram realizados no período de novembro de 2001 a fevereiro de 2002, num total de 103 cultivos orgânicos de várias espécies de brássicas. Foram registradas elevadas prevalências das doenças nos estados, com exceção em couve-chinesa em Santa Catarina. A prevalência da alternariose foi 100% nos cultivos de brócolis em Pernambuco, bem como em couve-flor nos dois estados, enquanto a podridão negra atingiu esse nível nos cultivos de brócolis e couve-flor em Santa Catarina. Na média das diferentes espécies de brássicas, as doenças foram mais prevalentes em Pernambuco que Santa Catarina. Entretanto, as médias de severidade de cada doença no conjunto das brássicas não foram diferentes entre os estados, embora as condições climáticas tenham sido nitidamente distintas. A severidade da alternariose variou entre as espécies de brássicas somente em Pernambuco, com a menor severidade registrada em couve-manteiga. Em relação à podridão negra, apenas em Santa Catarina houve diferença na severidade entre as brássicas, sendo registrados os menores níveis em couve-chinesa. Não foram constatadas correlações significativas entre os níveis de severidade da alternariose e da podridão negra, bem como da severidade destas com o número total de plantas e a idade das plantas nos cultivos.The objective of this research was to evaluate the intensity of Alternaria black spot, caused by Alternaria brassicicola and/or Alternaria brassicae, and black rot, caused by Xanthomonas campestris pv. campestris in organic cultivation of brassicas in Pernambuco and Santa Catarina. The survey was carried aut from November 2001 to February 2002, in 103 fields under

  5. Progresso da sigatoka-negra (Mycosphaerella fijiensis em bananeiras após a emissão do cacho no Município de Cáceres, Mato Grosso-Brasil Progress of black sigatoka (Mycosphaerella fijiensis in banana plants after the bunch emergence in the district of Cáceres, Mato-Grosso-Brazil

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    Márcia Benedita Martins

    2007-09-01

    Full Text Available A sigatoka-negra, causada pelo fungo Mycosphaerella fijiensis, pode causar 100% de perdas na produção das cultivares suscetíveis. O objetivo deste trabalho foi avaliar o progresso da sigatoka-negra em bananeiras após a emissão do cacho no Município de Cáceres, Mato Grosso. O experimento foi conduzido no período de fevereiro a dezembro de 2004 em plantios das cultivares Grande Naine, Maçã e Farta Velhaco, sendo esta última uma cultivar de plátano, do grupo Terra. As avaliações foram efetuadas a intervalos de 15 dias, quantificando-se, através de uma escala diagramática, a severidade da sigatoka-negra em todas as folhas de 5 plantas de cada cultivar, marcadas logo após a emissão das inflorescências. A partir dos dados coletados no campo, computaram-se: a severidade da doença na folha n.º 10 e o número de folhas viáveis. Considerou-se como folha viável as folhas sadias e aquelas com até 15% de área foliar lesionada. Os dados de temperatura e da umidade relativa foram registrados por um aparelho eletrônico instalado na área. A precipitação pluvial foi registrada na Estação meteorológica de Cáceres, distante 12 km do experimento. As condições climáticas foram favoráveis à sigatoka negra durante o ano todo e as plantas das cultivares Grande Naine, Maçã e Farta Velhaco após a emissão do cacho, perderam totalmente as folhas antes dos frutos atingirem o pleno desenvolvimento, cujos prejuízos no primeiro semestre atingiram 100% de perdas na produção comercializável.The black sigatoka, caused by Mycosphaerella fijiensis may cause 100% of yield losses in susceptible cultivars. The objective of this work was to evaluate the progress of the black sigatoka in banana plants after the bunch emergence, in the district of Cáceres, Mato Grosso State - Brazil. The experiment was carried out from February to December 2004, in banana cultivars "Grande Naine" and "Maçã", as well as plantain cultivar Farta Velhaco (Terra

  6. EFFECTS OF STOCKING DENSITY ON WATER QUALITY IN THAMBAQUI (Colossomamacropomum, CUVIER, 1818 RAISING DURING SECOND FINGERLING PERIOD IN FERTILIZED PONDS EFEITOS DA DENSIDADE DE ESTOCAGEM SOBRE A QUALIDADE DA ÁGUA NA CRIAÇÃO DO TAMBAQUI (Colossoma macropomum, CUVIER, 1818 DURANTE A SEGUNDA ALEVINAGEM, EM TANQUES FERTILIZADOS

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    Nadia Pales Machado

    2007-12-01

    Full Text Available

    In order to analize the effect of three stocking den-sities on the water quality in tambaqui rearing (Colossoma macropomum, CUVIER, 1818 during the fingerling II re-aring in fertilized ponds. 3,120 fingerlings with initial wei-ght of 1.41 ± 0.49 g were stocked in three densities: 33, 43 and 53 fingerlings/m². These fingerlings were fed with a commercial ration, three times on day, ad     libitum. The following parameters were analyzed: dissolved oxygen, total alkalinity, non-ionized ammonia and nitrite, using a chemical kit to water analyze and Secchi´s Disk to transparency. The data were analyzed in completely randomized desing in factorial diagram 3x5, with three stocking densities and five analyses. The hidrological variables studied stayied according with the standard of a good development of tambaqui in fertilized ponds, with exception of oxygen, that sowed values lower than literature regards, but this values didn’t damage the fish development.

    Key-words: Fingerling, hidrological variables, intensive system.

    Utilizaram-se 3.120 alevinos de tambaqui (Colos-soma macropomum, CUVIER, 1818, com pesos iniciais de 1,41 ± 0, 49 g, estocados nas densidades de 33, 43 e 53 alevinos/m2, com o objetivo de verificar o efeito de três densidades de estocagem sobre a qualidade da água na criação do tambaqui durante a segunda alevinagem em viveiros fertilizados. Alimentaram-se os peixes com ração comercial, fornecida três vezes ao dia, ad libitum. Analisaram-se os seguintes parâmetros: oxigênio dissolvido, pH, alcalinidade total, amônia não ionizada e nitrito, utilizando-se kit químico de análise de água, e a transparência mediante o Disco de Secchi. O delineamento foi inteiramente casualisado, em esquema fatorial 3 x 5, com três densidades de estocagem e cinco análises.Os resultados obtidos neste estudo permitiram concluir que, dentre as

  7. Tempo e melancolia: república, modernidade e cidadania negra nos contos de Astolfo Marques (1876-1918 Time and melancholy: Republic, modernity and black citizenship in the short story of Astolfo Marques (1876-1918

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    Matheus Gato de Jesus

    2012-01-01

    Full Text Available A história da Proclamação da República na periferia setentrional do Império brasileiro (1822-1889, assim como as especificidades de suas consequências culturais na região, ainda carece de análises mais detalhadas. No Maranhão de fin de siècle, a crise econômica do sistema agroexportador, somada à crise política do trabalho escravo, legou às primeiras décadas do regime republicano uma intensa luta social em torno da definição dos limites da cidadania, na qual a subalternização racial da população negra é um ponto decisivo. O presente trabalho é uma aproximação desses impasses através da obra ficcional do escritor negro maranhense Raul Astolfo Marques (1876-1918. Filho de uma cafusa livre, o autor é fruto da geração de descendentes escravos que se debateu com a fragilidade da liberdade conquistada na Abolição e do formalismo da igualdade outorgada em 15 de Novembro de 1889. Uma parte significativa da sua literatura poderia ser entendida como uma tentativa sistemática de interpretar essas esperanças e frustrações. O tema da República comparece ao longo de toda a sua trajetória intelectual em textos como "Abnegação" (1901, "A última sessão" (1903, "O discurso do Fabrício" (1903, "A opinião da Euzébia" (1904, "De coroa e barrete" (1908 e "Reis republicanos" (1916. Resta dizer que A nova aurora (1913, seu único romance, é inteiramente dedicado à descrição dos primeiros meses de implantação do regime republicano. Na primeira parte do ensaio indagamos quais "versões da história" e episódios significativos orientam a reconstrução ficcional das consequências do 15 de Novembro na periferia do Brasil, focalizando o conto "O discurso do Fabrício" e a crônica "A última sessão". No segundo momento, abordamos o tratamento literário dado pelo autor ao problema da política pública republicana no governo Rodrigues Alves (1902-1906, período auge da ideologia sanitarista no país e com tremendo impacto

  8. A imprensa negra e o futebol em São Paulo no início do século XX The Black Press and the soccer in São Paulo in the beginning of the 20th century

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    Bruno Otávio de Lacerda Abrahão

    2012-03-01

    Full Text Available Em São Paulo, na primeira metade do século XX, havia associações destinadas à promoção de atividades culturais e esportivas para os negros, que surgiram diante da necessidade de denunciar as práticas discriminatórias e promover a sociabilidade étnica através do atletismo, do boxe e, sobretudo, do futebol. Uma delas era a Imprensa Negra. Neste artigo, os autores buscaram compreender as estratégias da Imprensa Negra para noticiar a participação do negro no emergente campo do futebol. Utilizando a perspectiva teórica da História Cultural, se ocuparam dos conteúdos das matérias dos jornais da Imprensa Negra, disponíveis na Biblioteca Nacional na forma de microfilmes. O objetivo foi observar a continuidade e a regularidade do discurso, os pontos de afrontamento e de disputa simbólica em torno da negociação da construção identitária da "raça negra" no esporte e captar, através das mensagens emitidas por esses órgãos da imprensa, as estratégias de distinção utilizadas por esse grupo étnico/racial em torno da contestação das representações negativas ou construção de representações positivas sobre o negro no emergente campo do futebol. Concluíram que o sentimento de consciência racial, a necessidade de se integrar à nação e o desejo de ascensão social eram os motivos que mantinham unidos os negros através daquelas associações. A Imprensa Negra procurou construir uma representação identitária do negro que privilegiasse o capital futebolístico, sem se esquecer dos predicados morais como a disciplina, a higiene e a ordem. A estratégia de divulgação dos feitos de sucesso dos negros no campo esportivo promovia uma identidade positiva do negro no futebol, em conformidade com as demandas daquele contexto: uma nação higienizada e disciplinada na esteira do projeto nacional que via no futebol um meio de expressão positiva da brasilidade.In the first half of the 20th century, in São Paulo, there were

  9. Age and growth changes and population dynamics of the black pomfret (Parastromateus niger and the frigate tuna (Auxis thazard thazard, in the Taiwan Strait Cambios en la edad y el crecimiento y dinámica poblacional de la palometa negra (Parastromateus niger y del atún fragata (Auxis thazard thazard, en el estrecho de Taiwán

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    Yu Tao

    2012-09-01

    Full Text Available The age and growth and population dynamics of the black pomfret, Parastromateus niger and the frigate tuna, Auxis thazard thazard were studied from specimens collected monthly in the Taiwan Strait from April 2005 to March 2006. With five age groups of each, the dominant black pomfret was one year, while frigate tuna was two years. The total mortality coefficient (Z and the fishing mortality (F of the black pomfret were at high levels, the exploitation ratio (E was over 0.5, and the number of captured juvenile fishes showed that the stock of black pomfret in this area was overexploited and improper fishing gear was utilized. Compared with previous studies, the maximum and mean fork length, body weight and age of the two fishes declined gradually, the populations were younger in age and smaller in size. The growth coefficient k increased and age at the inflexion point of weight t r was younger than before. The smaller change of the fork length at first maturity of the two fishes has indicated a more vulnerable fishery ecosystem in this area. Therefore, in addition to the traditional fishery management approach, such as taking the minimum length into consideration, ecosystem approach to fisheries management (EAF should be taken to improve the practical fishing management, including conserving the small pelagic fishery population in order to achieve the sustainable fishing of the stocks.La edad y crecimiento de la palometa negra, Parastromateus niger y del atún fragata o melva, Auxis thazard thazard se estudiaron a partir de especímenes capturados mensualmente en el estrecho de Taiwan, entre abril 2005 y marzo 2006. Se determinaron cinco grupos de edad, siendo dominante en la palometa negra los ejemplares de un ano, mientras que en el atún fragata los de dos anos. El coeficiente de mortalidad total (Z y la mortalidad por pesca (F de la palometa negra se encontraron en niveles altos. La tasa de explotación E resultó sobre 0,5 y el número de

  10. Relationship of black layer and milk line development on maize seed maturity Relação entre o desenvolvimento da camada negra e da linha de transformação em amido e a maturidade de sementes de milho

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    R.D. Vieira

    1995-04-01

    Full Text Available The relationship of black layer and milk line development on maize seed maturity was evaluated under tropical conditions. Seed moisture (g.kg-1, standard germination - SG (7 days, 25°C, and vigor, using accelerated aging-AA (96 hours, 42°C and 100% of RH, cold test-CT only in 1991/92 (7 days at 10°C and 7 days at 25°C and electrical conductivity-EC (four 50-seed samples, 24 hours imbibition at 25°C and milk line and black layer formation (using a five-stage rating system were determined at 3 to 4 days intervals, using two genotypes (hybrid CX 133 and variety IAC 100 during the crop seasons of 1990/91 and 1991/92. The results showed that physiological maturity was reached before stage 4, based on seed germination and vigor (AA and CT values, which occurred before that stage and presented the lowest values of EC. On the other hand, moisture content levels of 300 to 350 g.kg-1 were reached only at stage 4. The milk line ratings proved useful in predicting physiological maturity as well as the harvest maturity.A relação entre o desenvolvimento da camada negra e da linha de transformação em amido e a maturidade fisiológica de sementes de milho foi estudada durante dois anos agrícolas (1990/91 e 1991/92. Para atingir os objetivos do trabalho, avaliou-se o grau de umidade, a germinação, o vigor (envelhecimento acelerado, teste frio e condutividade elétrica e o desenvolvimento da camada negra e da linha de transformação em amido para dois genótipos (CX 133 e IAC 100. Com base nos resultados de germinação e vigor das sementes verificou-se que a maturidade fisiológica foi alcançada antes do estádio 4. Por outro lado, graus de umidade de 30 a 35% foram alcançados somente no estádio de desenvolvimento 4. A linha de transformação em amido provou ser um instrumento útil para predizer a maturidade fisiológica e de colheita para sementes de milho.

  11. Educação, identidade negra e formação de professores/as: um olhar sobre o corpo negro e o cabelo crespo Education, black identity, and teacher education: a look upon the black body and hair

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    Nilma Lino Gomes

    2003-06-01

    Full Text Available Este artigo discute as particularidades e possíveis relações entre educação, cultura, identidade negra e formação de professores/as, tendo como enfoques principais a corporeidade e a estética. Para tal, apresenta a necessidade de articulação entre os processos educativos escolares e não-escolares e a inserção de novas temáticas e discussões no campo da formação de professores/as. Dando continuidade às reflexões realizadas pela autora na sua tese de doutorado, discutem-se as representações e as concepções sobre o corpo negro e o cabelo crespo, construídas dentro e fora do ambiente escolar, a partir de lembranças e depoimentos de homens e mulheres negras entrevistados durante a realização de uma pesquisa etnográfica em salões étnicos de Belo Horizonte. Para essas pessoas, a experiência com o corpo negro e o cabelo crespo não se reduz ao espaço da família, das amizades, da militância ou dos relacionamentos amorosos. A escola aparece em vários depoimentos como um importante espaço no qual também se desenvolve o tenso processo de construção da identidade negra. Lamentavelmente, nem sempre ela é lembrada como uma instituição em que o negro e seu padrão estético são vistos de maneira positiva. O entendimento desse contexto revela que o corpo, como suporte de construção da identidade negra, ainda não tem sido uma temática privilegiada pelo campo educacional, principalmente pelos estudos sobre formação de professores e diversidade étnico-cultural. E que esse campo, também , ao considerar tal diversidade, deverá se abrir para dialogar com outros espaços em que os negros constroem suas identidades. Muitas vezes, locais considerados pouco convencionais pelo campo da educação, como por exemplo, os salões étnicos.This article discusses the specificities and possible relations between education, culture, black identity, and teacher education, approaching them from the perspective of corporeity and

  12. Movimento de mulheres negras: trajetória política, práticas mobilizatórias e articulações com o Estado brasileiro Afro-Brazilian women's social movement: political trajectory, mobilization practices and articulations with the Brazilian state

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    Cristiano Santos Rodrigues

    2010-12-01

    Full Text Available O presente artigo analisa a trajetória e consolidação do Movimento de Mulheres Negras (MMN na cena pública brasileira ao longo dos últimos trinta anos. Através de entrevistas com militantes pioneiras e participantes desse movimento social bem como de levantamento de fontes documentais, o estudo teve o intuito de compreender quais processos subjazem a constituição desse novo sujeito coletivo, seus dilemas e redes de solidariedade com outros movimentos sociais, o lugar das hierarquias de gênero e raça em suas reivindicações, além do seu processo de institucionalização/burocratização e sua articulação com o Estado brasileiro.This paper examines the trajectory and consolidation process of the Afro-Brazilian Women's Social Movement in the public sphere over the last thirty years. Trough interviews with activists and participants of this social movement as well as survey of documental sources, the study had the aim to understand those processes that underlying the constitution of these collective political subjects, and their dilemmas and solidarity networks with other social movements. Furthermore, this paper also discusses the role of hierarchies of gender and race in the Afro-Brazilian Women's Social Movement claims, and its process of institutionalization / bureaucratization along with its articulation with the Brazilian state.

  13. Impact of the Prestige oil spill on marsh soils: Relationship between heavy metal, sulfide and total petroleum hydrocarbon contents at the Villarrube and Lires marshes (Galicia, Spain); Impacto de la marea negra del Prestige en suelos de marisma: relacion entre los contenidos de metales pesados, sulfuros e hidrocarburos en las marismas de Villarrube y Lires (Galicia, Espana)

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, L.; Marcet, P.; Covelo, E.F.; Vega, F.A. [Department of Vegetable Biology and Soil Science, Vigo (Spain); Fernandez-Feal, L.; Fernandez-Feal, C. [Escuela Politecnica Superior, Universidad de la Coruna, Ferrol (Spain)

    2004-09-15

    The objectives of this study were to determine the effect of the Prestige oil spill on the total petroleum hydrocarbons and heavy metal contents of soils in two marshes (Lires and Villarrube, Galicia, Spain) and the relationship between their oxidation-reduction potential and the solubility of heavy metals with sulfide and sulfate contents. Soil samples were taken from polluted and unpolluted areas and their petroleum hydrocarbon contents, heavy metal contents and other chemical characteristics were measured. The soils affected by the oil spill show remarkable contents of Cr, Cu, Ni, Pb and V. The Lires marsh soils are more affected by fuel oil than Villarrube marsh. The effects of the contaminating agents on the soils reach distances of up to 500 m from the coastline. In the first 400 m, there are important spatial variations because the fuel oil penetrated into the soils through tidal action and not directly. The Cr, Cu, Ni, Pb and V contents of polluted soils were between 50 and 200 times higher than those of their unpolluted counterparts and the background concentrations in Galician coastal sediments. In the case of Cr, Cu, Ni, Pb and V, their origin through the fuel oil was corroborated by the high correlation (r > 0.90) between the concentrations of these metals and the total petroleum hydrocarbon content of the polluted soils, which shows the combined addition of these metals through the fuel oil. [Spanish] Los objetivos de este trabajo fueron determinar el efecto de la marea negra del buque tanque Prestige en el contenido total de hidrocarburos y de metales pesados en suelos de dos marismas (Lires y Villarrube, Galicia, Espana) y la relacion entre el potencial de oxidacion-reduccion y la solubilidad de los metales pesados con los contenidos de sulfuros y de sulfatos. Se tomaron muestras de suelos de las zonas contaminadas y no contaminadas y se determinaron diversas caracteristicas quimicas, el contenido total de hidrocarburos y de metales pesados. Los

  14. INTEGRACIÓN DE INDUCCIÓN DE RESISTENCIA CON BACTERIAS QUITINOLÍTICAS EN EL CONTROL DE LA SIGATOKA NEGRA (Mycosphaerella fijiensis Morelet EN BANANO INTEGRATION OF INDUCED RESISTANCE WITH CHITINOLYTIC BACTERIA IN BLACK SIGATOKA CONTROL (Mycosphaerella fijiensis Morelet IN BANANA

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    Catalina María Zuluaga Amaya

    2007-12-01

    Full Text Available Se evaluó en condiciones de campo en la zona bananera de Urabá-Colombia, el efecto de inductores de resistencia y bacterias quitinolíticas sobre el desarrollo de la Sigatoka Negra en plantas de banano del cultivar Gran Enano. Como inductores de resistencia se utilizaron acibenzolar-s-metil (ASM (20 cm³ · ha-1 i.a. y ácido salicílico (AS (20 cm³ · ha-1 i.a cada uno en rotación y en mezcla con fungicidas utilizados en el control convencional de la enfermedad; se evaluó también la mezcla de estos inductores con bacterias quitinolíticas aisladas de la filosfera de banano; así como el efecto del fungicida biológico Biofun® ( 1,5 L · ha-1 de p.c. en rotación con fungicidas y en mezcla con ASM. La aplicación de ASM en rotación y en mezcla con fungicidas convencionales presentó un control de la enfermedad hasta un 50% mayor al obtenido con el control convencional, evidenciado esto en los valores más bajos del área bajo la curva del índice de severidad de la enfermedad (IS y más altos de hojas sanas (HS al momento de la floración. Los tratamientos, que incluyeron AS en rotación y mezcla con fungicidas convencionales, al igual que el producto Biofun® en rotación y en mezcla con ASM, mostraron un control de la enfermedad estadísticamente igual al obtenido con el control convencional, lo cual reveló una reducción de 46 - 100% de la cantidad de fungicidas convencionales usados en el control de la Sigatoka Negra.The effect of resistance elicitors and chitinolytic bacteria was evaluated on Black Sigatoka control in banana plants, in field conditions in Urabá-Colombia. Acibenzolar-s-metil (ASM (20 cm³ · ha- 1 a.i. and salicilyc acid (SA (20 cm³ a.i.ha-1 were used in rotation and mixture with conventional fungicides, and in mixture with chitinolytic bacteria isolated from banana phyllosphere. Biological fungicide Biofun® ( 1,5 L · ha-1 de p.c. was also tested in rotation and mixture with ASM. When fungicides were in rotation

  15. Efecto del consumo de dietas con avena y caraotas negras sobre el perfil lipídico en un modelo experimental en rata Effect of consumption of diets with oats and black beans on the lipid profile of an experimental model in rat

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    Mirla Ch Morón

    2010-06-01

    Full Text Available El consumo de alimentos ricos en fibra dietética (FD soluble e insoluble, afecta favorablemente el perfil de lípidos séricos al reducir las concentraciones de colesterol total, colesterol- LDL y triglicéridos (TG. El objetivo de este trabajo, fue comparar el efecto del consumo de dietas con avena (Avena sa tiva y con caraotas negras (Phaseolus vulgaris sobre el perfil lipídico de ratas. Quince ratas machos, cepa Sprague Dawley, fueron alimentadas ad libitum por 18 días, con tres tipos de dietas: un con trol, una conteniendo caraotas negras (15% p/p y otra con avena (15% p/p. La concentración del colesterol total sérico disminuyo 50,56% en el grupo alimentado con avena y 40,52% en el alimentado con caraotas. Así mismo, se observó una disminución de colesterol-LDL de 49,21% en el grupo alimentado con avena y un 42,93% en el grupo alimentado con caraotas. Hubo una reducción de 52,47% del colesterol-HDL en el grupo alimentado con avena y 31,29% para el grupo alimentado con caraotas; esta reducción no es beneficiosa. La concentración de TG séricos fue significativamente menor, un 50,20% para el grupo alimentado con avena y de 51,8% para el grupo alimentado con caraota. La disminución de los lípidos séricos debido a la dieta, con avena o con caraotas, mostró diferencias significativas respecto al control, pero, no entre ellas. La consideración de estos resultados en el caso de la salud humana es bien importante, particularmente en la disminución de la prevalencia de enfermedades cardiovasculares. El efecto de FD sobre los niveles de colesterol-HDL, son hasta los momentos, contradictoriosThe consumption of foods rich in soluble and insoluble dietary fiber (DF favorably affects the serum lipid profile by lowering total cholesterol, LDL-cholesterol and triglycerides (TG. The objective of this work was to compare the effect of consumption of diets with oats (Avena sativa and black beans (Pha seo lus vulgaris on the lipid profile of

  16. Efeitos de substratos e recipientes utilizados na produção das mudas sobre a arquitetura do sistema radicular de árvores de cácia-negra Effect of nursery substrata and containers on root system architecture of black wattles trees

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    Carmen Silvia Vieira Janeiro Neves

    2005-12-01

    Full Text Available O objetivo deste trabalho foi caracterizar a arquitetura do sistema radicular de árvores de acácia-negra (Acacia mearnsii aos três anos após o plantio, em razão da combinação de oito tipos de recipientes e seis misturas de substratos usados na produção das mudas, levando-se em consideração atributos químicos e físicos do solo. As árvores foram plantadas no município de Cristal (RS, em solo Podzólico Vermelho Escuro, que apresentou alta densidade, baixo pH e excesso de alumínio. O tratamento que teve maior desenvolvimento radicular foi o fertil-pot, com substrato constituído por solo adubado, que diferiu estatisticamente dos tratamentos tubete redondo, com solo adubado + casca de acácia esgotada + vermiculita; paper pot, com solo adubado e laminado acondicionado em caixas de madeira, com solo adubado. O desenvolvimento e arquitetura das raízes no campo foram afetado pelo recipiente, mas não pelo substrato utilizado na fase de viveiro.The objective of this study was to characterize the architecture of the root system of black wattle trees (Acacia mearnsii, three years after planting, in relation to eight types of containers and six substrata used in the nursery, considering chemical and physical conditions of the soil. The experiment was carried out in Cristal (RS, in a Podzolic Dark Red soil. The soil presented high density, low pH and excess of aluminum. The treatment that induced larger root development was fertil-pot with fertilized soil, which differed significantly from the treatments round plug, with fertilized soil + acacia exhausted bark + vermiculite; paper pot, with fertilized soil and laminated in wood box, with fertilized soil. The development and the architecture of the roots in the field was affected by the container but not by the substrata used in the nursery.

  17. Contenido de alimento y metabolismo ceco-cólico en el tracto digestivo de poblaciones silvestres de iguana negra (Ctenosaura pectinata en Morelos, México Cecum-colic content of food and metabolism in the digestive tract of wild population black lizard (Ctenosaura pectinata in Morelos, Mexico

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    L Vélez-Hernández

    2012-01-01

    Full Text Available Se colectaron cinco tractos digestivos de iguana negra (Ctenosaura pectinata en estado silvestre en el estado de Morelos, México, para conocer la composición botánica de la dieta y el metabolismo ceco-cólico. Se observaron frotis realizados del contenido ceco-cólico para registrar la presencia de protozoarios, bacterias y parásitos intestinales existentes. Se obtuvo la media y desviación estándar de las características evaluadas. En el contenido ceco-cólico se identificaron las especies vegetales guamúchil (Phitecellobium dulce y huizache (Acacia farnesiana. Se estimó en base a materia seca la porción vegetal que conforma la dieta, la cual se distribuyó en frutos (62,9%, hojas (30,6%, rebrotes (2,9% y flores (3,5%. La región ceco-cólica se caracterizó por la concentración (mmol de los ácidos grasos acético (68,9 ± 10,6, butírico (11,98 ± 5,7, propiónico (9,04 ± 1,5 y total (89,9 ± 15, con pH de 7,45 y concentración de nitrógeno amoniacal (7,4 ± 2,8 mg/dl. La microbiota que se observó fue el protozoario Nyctotherus spp. Las bacterias totales oscilaron en concentraciones 7 x 10 a 9 x 10/g, siendo las celulolíticas de 9,2 x 10 hasta 3,5 x 10/g de contenido cecal. Los parásitos encontrados son nematodos identificados como miembros de la superfamilia Oxyuroidea con 655 ± 265/g huevos y 6,300 ± 329 adultos/iguana. Se concluye que la fermentación de la región ceco-cólica de la iguana negra en estado adulto se comporta de manera similar como en las especies herbívoras, en las cuales la fermentación se manifiesta de acuerdo con el alimento consumido. La concentración dietaria de proteína cruda fue de 14,5% y energía de 2,193 Mcal/kg y son animales parasitados con oxiuros.Five digestive tracts of black lizards (Ctenosaura pectinata from a wild population were collected in Morelos State, México, in order to identify the plant composition in the diet and the cecum-colic metabolism. Smears obtained from cecum

  18. Effect of alcoholic extract of guaco (Mikania glomerata on the control of dark rot (Xanthomonas campestris pv. campestris in cauliflower/ Avaliação da eficácia da tintura etanólica de guaco (Mikania glomerata no controle da podridão negra (Xanthomonas campestris pv. campestris em couve-flor

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    Kátia Regina Freitas Schwan-Estrada

    2006-06-01

    sido afetada por doenças a exemplo da podridão negra causada por Xanthomonas campestris pv. campestris, fomentando novas pesquisas para seu controle. Com o objetivo de verificar o potencial de Mikania glomerata no controle dessa doença, a tintura etanólica 50 oGL dessa planta medicinal foi avaliada quanto: atividade ntimicrobiana in vitro através do crescimento bacteriano em tubos de ensaio contendo 100, 250, 500 e 1000 mg L-1 da tintura; indução de resistência local ou sistêmica em plantas de couve-flor aos 25 dias de idade, em casa de vegetação, através da pulverização de tintura oncomitantemente e três dias antes da inoculação com o patógeno, sendo água e calda bordaleza tratamentos controle; atividade de peroxidases em folhas tratadas e não tratadas de couve-flor, colhidas concomitantemente e as 24, 48 e 72 h da pulverização da tintura e, após pulverizaçãoinoculação. A tintura etanólica, in vitro, promoveu inibição no crescimento bacteriano, a partir da concentração de 250 mg L-1. Nas concentrações de 500 mg L-1 e 1000 mg L-1 foram observadas, respectivamente, 24% e 38% de inibição do crescimento bacteriano. Nas plantas de couve-flor foi observada redução da doença apenas em folhas tratadas com 100 e 500 mg L-1 de tintura, plicada concomitantemente à inoculação, comportamento este semelhante ao da calda bordaleza, ndicando que o controle através da tintura de guaco é através de atividade antimicrobiana direta. Ficou indicado que a indução de peroxidases ocorreu devido ao processo infeccioso e não em função dos tratamentos com tintura etanólica de guaco. Estes resultados indicam o potencial da tintura de guaco para o controle preventivo da podridão negra em couve-flor.

  19. Cultura negra e educação

    OpenAIRE

    Nilma Gomes Lino

    2003-01-01

    This article is focused on the relation between culture, black culture and education. Black culture is presented as a cultural peculiarity historically constructed by a specific ethnic / racial group extant in the Brazilian way of life, independent of its ethnic origins. However, it predominates among the descendants of enslaved Africans in Brazil, that is, among the black segment of the population. In the specific case of Brazilian school education, it i...

  20. Cultura negra e educação

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    Nilma Gomes Lino

    2003-01-01

    Full Text Available This article is focused on the relation between culture, black culture and education. Black culture is presented as a cultural peculiarity – historically constructed by a specific ethnic / racial group – extant in the Brazilian way of life, independent of its ethnic origins. However, it predominates among the descendants of enslaved Africans in Brazil, that is, among the black segment of the population. In the specific case of Brazilian school education, it is understood that the discussion on black culture cannot disregard the existence of racism and inequality between black and white people in our society. Such a consideration will distance us from the educational practices, which still insist on classifying black culture as part of our exotic folklore and will enable us to construct a political posture with respect to the racial issue in Brazilian education.

  1. A poesia ‘é-sou’ negra = Negro poetry

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    José Pires Laranjeira

    2010-01-01

    Full Text Available Os diversos cânones da poesia brasileira não contemplam a poesia negrobrasileira como deveria ser. Sendo o poeta Luiz Gama ainda hoje menosprezado, em comparação com Castro Alves, é necessário, pois, colocá-lo no seu verdadeiro lugar de significação. Porém, esse esforço deve servir também para compreender que Gama, na sua poesia, ainda mostra alguma conformidade com certos preconceitos rácicos próprios do século XIX e que se encontram, por exemplo, em poetas angolanos. Já o poeta Solano Trindade, devido à sua formação ideologicamente comprometida com os pobres e miseráveis da sociedade, trata o negro como um ser social, econômico e cultural de corpointeiro, concepção aprofundada por Cuti, que, finalmente, deixa de apelidar o mestiço de mulato, segundo a conformidade com o Movimento Negro. Por outro lado, é um poeta da modernidade mais avançada, quer formalmente, quer atingindo o âmago do subconsciente negro, ao versar o seu sofrimento íntimo, de modo inédito. Brazilian poetry’s several literary canons fail to fully investigate Brazilian Black Poetry as it should be. In spite of the fact that the poet Luiz Gama is currently not in the limelight when compared to Castro Alves, the replacing of his real place of significance is actually worthwhile. This effort should also be needed to understand that Gama in his poetry shows a type of conformity with certain racial bias common in the 19th century as, for example, in the poetry of Angola. On the other hand, due to his ideologically committed ideology with the poor and destitute in society, the poet Solano Trindade deals with the Negro as a social, economical and cultural person. This concept is partook by Cuti who, at long last, do not call the half-breed as ‘mulato’, following orientations of the Negro Movement. On the other hand, he is formally poet featuring themost advanced modernity as he reaches the heart of the Negro subconscious in his singing of deep personal suffering in the most unusual manner.

  2. La melancholía de las panteras negras

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    Luisa Futoransky

    1995-12-01

    Full Text Available lmaginemos una piedra de deshielo. Se desliza por la fuerza de gravedad -de la que los seres animados e inanimados somos tributarios basta hoy-, los vientos y los accidentes del terreno; con su corazón, su centro cordial duro de antiguos minerales y una periferia que crece con hierbas, obstáculos, pequeños objetos que se lían como ayuda memoria u anécdotas del terreno, basta que confluye en un rió violento, que como todos los rios van bacia el mar, pero como pregona la Biblia, el mar no se henche. Tal presiento, recojo y observo la voz de las minorías diaspóricas en el canal grande de la literatura hispanoamericana.

  3. Las negras rioplatenses: entre la invisibilidad y el mito

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    Mar Langa Pizarro

    2011-01-01

    Slavery, which plaid a significant role in several ancient civilizations around the world, was supported by philosophers, theologians and popes. Even if its importance has been underestimated, the presence of black women and men is stated from the first expeditions to the River Plate (many times, by means of illegal traffic). Led by bishop Vitoria, that traffic increased since the late 16th century. Black women were often sexually exploited but, instead of paying attention to their problems, ...

  4. Cuotas raciales, identidad negra y derechos en el Brasil

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    Gislene Aparecida

    2008-09-01

    Full Text Available La implementación de políticas públicas basadas en criterios raciales para el acceso de estudiantes negros a las universidades en el Brasil divide a intelectuales respecto a la viabilidad de esta forma de acción afirmativa. Sin embargo, esta discusión ha considerado muy poco las perspectivas de los propios estudiantes. En este artículo se presentan datos sobre cómo los jóvenes, futuros beneficiarios del actual proyecto de ley, re p resentan la política de cuotas y muestra cómo este tema revela la complejidad de la sociedad brasileña. Se sugiere por lo tanto, que esta cuestión sea abordada desde una perspectiva múltiple que nos permita reflexionar sobre los pro blemas que las sociedades multiculturales presentan a las teorías clásicas del derecho y la justicia.

  5. Las negras rioplatenses: entre la invisibilidad y el mito

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    Mar Langa Pizarro

    2011-12-01

    Full Text Available Slavery, which plaid a significant role in several ancient civilizations around the world, was supported by philosophers, theologians and popes. Even if its importance has been underestimated, the presence of black women and men is stated from the first expeditions to the River Plate (many times, by means of illegal traffic. Led by bishop Vitoria, that traffic increased since the late 16th century. Black women were often sexually exploited but, instead of paying attention to their problems, much of the literature has ignored them or has created an archetypal woman, characterized by beauty, sensuality and eroticism. With some exceptions, this image remains in our days.

  6. Classe média negra de Maringá

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    Rosangela Praxedes

    2010-06-01

    Full Text Available

     

    O estudo sobre a mobilidade social ascendente da população brasileira, em particular o aumento apontado por diferentes estudos demográficos das classes médias em relação aos demais segmentos populacionais, leva-nos a uma reflexão sobre as desvantagens raciais relacionadas à ascensão social dos indivíduos considerados negros. Pesquisas indicam que a sociedade brasileira tem proporcionado algumas oportunidades de mobilidade social aos seus membros.

     

  7. Caracterização de isolados de Xanthomonas campestris pv campestris de sistemas de produção orgânico e reação de brássicas à podridão-negra Characterization of strains of Xanthomonas campestris pv campestris from organic farming systems and reaction of brassicas to black rot

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    Liliana Andréa dos Santos

    2008-12-01

    Full Text Available Noventa isolados de Xanthomonas campestris pv. campestris (Xcc de brássicas oriundas de sistemas de produção orgânico das Zonas da Mata e Agreste de Pernambuco foram caracterizados com base na sensibilidade a antibióticos e sulfato de cobre e atividade de esterase. A maioria apresentou alta sensibilidade à tetraciclina (76,6%, eritromicina (63,3% e estreptomicina (63,3%, resistência à amoxicilina (70%, gentamicina (40,0% e norfloxacin (45,5% e média sensibilidade (44,4% ou resistência (44,4% à neomicina. Cinqüenta e cinco isolados de Xcc foram resistentes ao sulfato de cobre na concentração de 50 mg/mL e todos foram sensíveis ao produto na concentração de 200 mg/mL. Atividade de esterase foi apresentada por 92,22% dos isolados. A análise Euclidiana por ligação simples evidenciou variabilidade entre os isolados separando-os em sete grupos de similaridade. Foi estudada também a reação de 14 cultivares de brássicas à podridão-negra, utilizando o isolado "B21" de Xcc. As cultivares diferiram significativamente entre si em relação ao período de incubação, incidência e severidade final da doença. Os maiores valores de severidade final da doença foram verificados em brócolos "Ramoso", couve-flor "Bola de Neve" e "Piracicaba de Verão", e repolho "Chato de Quintal". Os híbridos de couve-chinesa "AF 70", "AF 72", "AF 69" e "AF 66" mostraram-se altamente resistentes à doença, enquanto que brócolos "Ramoso" e "Precoce Piracicaba", couve-flor "Piracicaba de Verão" e "Híbrido Cindy" e repolho "60 Dias" foram medianamente resistentes.Ninety strains of Xanthomonas campestris pv. campestris (Xcc from brassicas grown under organic farming systems in the "Mata" and "Agreste" regions of Pernambuco, Brazil, were characterized based upon sensitivity to antibiotics and copper sulfate, and esterase activity. Most of the strains showed high sensitivity to tetracycline (76.6%, erythromycin (63.3% and streptomycin (63

  8. Os Centros de Testagem e Aconselhamento (CTA no município do Rio de Janeiro e o acesso ao diagnóstico do HIV entre e população negra: uma análise qualitativa Testing and Counseling Centers (TCC in Rio de Janeiro city, and access to the HIV diagnosis for the black population: a qualitative analysis

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    Carla Luzia França Araújo

    2010-12-01

    Full Text Available O acesso aos serviços de saúde é um direito constitucional. Entende-se como acesso a capacidade de obtenção de cuidados de saúde, quando necessário, de modo fácil e conveniente. Entre os desafios para a gestão em saúde, encontram-se as desigualdades de acesso como um dos principais problemas. As diferenças marcantes nas taxas de utilização dos serviços de saúde apontam as graves desigualdades de acesso refletindo as desigualdades sociais. Este artigo tem por objetivo discutir o acesso ao diagnóstico do HIV pela população negra do município do Rio de Janeiro. Para trabalhar com o objeto proposto, optamos pela metodologia qualitativa. A coleta de dados consistiu na realização de 62 entrevistas semiestruturadas, com pessoas que se autodeclararam pretas ou pardas e que procuraram os Centros de Testagem e Aconselhamento do Município do Rio de Janeiro para a realização do teste anti-HIV. A análise dos dados ocorreu baseada nos pressupostos do Discurso do Sujeito Coletivo. A maioria dos entrevistados não relatou dificuldades para o acesso ao teste anti-HIV. A barreira identificada foi a própria demanda reprimida nos CTA por conta de oferecimento limitado de testes devido a questões de insumo e recursos humanos. Não foi verificada nenhuma fala que demonstrasse discriminação com relação à cor/raça no contato com o serviço. Entre os fatores apontados como facilitadores do acesso ao teste foram: gratuidade do exame, indicação ou referência por profissionais ou serviço de saúde, acesso ao local de realização do teste, credibilidade do serviço, rapidez no atendimento e ausência de burocracia.Access to health services is a constitutional right. Access is considered as the capacity to obtain health care when necessary, in an easy and convenient way. Challenges for health management include unequal access as one of the main problems. Clear differences in health service usage rates indicate severe access inequality

  9. Diversidade genética e eficiência simbiótica de rizóbios noduladores de acácia-negra de solos do Rio Grande do Sul Genetic diversity and symbiotic efficiency of black wattle-nodulating rhizobia in soils of Rio Grande do Sul State, Brazil

    Directory of Open Access Journals (Sweden)

    Luciano Kayser Vargas

    2007-08-01

    Full Text Available A acácia-negra é a terceira espécie florestal mais cultivada no Brasil. Além de sua importância econômica, é utilizada na recuperação de áreas degradadas, nas quais o solo geralmente apresenta pH baixo e altos teores de Al. O presente trabalho objetivou avaliar a diversidade genética de rizóbios naturais de solos do Rio Grande do Sul e selecionar isolados eficientes na fixação de N2 em condições de pH baixo. Um total de 50 isolados de Bradyrhizobium sp. foi obtido, os quais, juntamente com as estirpes recomendadas BR 3067 e BR 3068, foram caracterizados com o marcador BOX A 1-R. O padrão de bandas dos isolados foi utilizado na construção de um dendrograma, a partir do qual se calculou o índice de diversidade de Shannon. Dez isolados foram testados quanto à tolerância a pH baixo e à presença de Al, selecionando-se oito para o teste de eficiência simbiótica em casa de vegetação. Observou-se diversidade genética elevada entre os isolados, com a formação de 10 grupos, a partir do ponto de corte de 70 % de similaridade e com o índice de diversidade de 4,30. A presença de Al não afetou os isolados avaliados, que tiveram seu crescimento reduzido em pH 4,5. Quanto à eficiência simbiótica, os isolados T6-16 e V-7 foram os mais eficientes, assemelhando-se à estirpe recomendada BR 3068.Black wattle is the third most cultivated forest species in Brazil. Besides its economic importance, black wattle is also used to restore degraded areas, where soils are generally acid and Al levels high. This study intended to investigate the genetic diversity of indigenous rhizobia in soils in Rio Grande do Sul and to select isolates that fix N2 efficiently at low pH. Fifty Bradyrhizobium sp. isolates were obtained, which, along with the recommended strains BR 3067 and BR 3068, were molecularly characterized by PCR with primer BOX A 1-R. DNA band patterns of the isolates were used to construct a dendrogram by which the Shannon

  10. Conteúdo e exportação de micronutrientes em acácia-negra (Acacia Mearnsii De Wild. procedência batemans bay (Austrália Content and exportation of micronutrients in black wattle (Acacia Mearnsii de wild. of Australian batemans bay provenance

    Directory of Open Access Journals (Sweden)

    Marcos Vinicius Winckler Caldeira

    2003-02-01

    Full Text Available O objetivo do presente trabalho foi estimar o conteúdo e a exportação de micronutrientes (Mn, B, Cu, Zn e Fe e o Na nos diferentes componentes de árvores de um povoamento de acácia-negra (Acacia mearnsii De Wild., procedência australiana Batemans Bay, com 2,4 anos de idade, em Butiá-RS (Brasil. A biomassa total estimada foi de 36.155 kg/ha, apresentando distribuição de 46,0, 20,0, 19,5, 12,0 e 3,0%, na madeira do lenho, nas folhas, nos galhos vivos, na casca e nos galhos mortos, respectivamente. A proporção de micronutrientes acumulados na biomassa dos componentes da árvore foram 43,76% nas folhas, 26,94% na madeira do tronco, 19,56% nos galhos vivos, 7,21% na casca e 2,54% nos galhos mortos. A quantidade estimada de micronutrientes contidos na biomassa acima do solo foi 10,4 kg/ha, acumulados da seguinte forma: Na (58,84%, Fe (21,79%, Zn (9,16%, B (4,09%, Mn (4,59% e Cu (1,54%. A casca e a madeira do lenho acumulou Na (21,47%, Fe (6,71%, Mn (2,11%, Zn (1,66%, B (1,58% e Cu (0,63%. A copa (folhas e galhos vivos e mortos acumularam Na (37,36%, Fe (15,07%, Zn (7,49%, B (2,53%, Mn (2,48% e Cu (0,91%. A exploração intensiva de áreas com a procedência Batemans Bay gera suspeitas de possíveis ocorrências de deficiências nutricionais de Na nas rotações futuras, tornando necessário o emprego de fertilizantes para manter a produtividade do sítio.This study aimed to estimate the content and exportation of micronutrients (Mn, B, Cu, Zn e Fe and Na in different tree components of black wattle (Acacia mearnsii De Wild. forest of Batemans Bay Australian provenance, 2.4 years old in Butiá, RS, Brazil. The total biomass found was 36,155 kg/ha, thus distributed: 46.0%; 20.0%; 19.5%; 12.0% and 3.0%, spread in the wood of the stem, leaves, live branches, bark and dead branches, respectively. The proportion of the micronutrients accumulated in the biomass of the components were: leaves (43.76%, wood of the stem (26.94%, live branches (19

  11. Lutitas negras lacustres cercanas al límite Paleógeno-Neógeno en la región noroccidental de la provincia del Neuquén: Evidencias palinológicas Lacustrine black shales near to the Paleogene - Neogene boundary in north-western Neuquén Province: palynological evidence

    Directory of Open Access Journals (Sweden)

    H. A. Leanza

    2002-09-01

    Full Text Available Se muestrearon con fines palinológicos sedimentitas lacustres referidas a la Formación Lileo nov. aflorantes en las cercanías de la localidad de Los Miches, en el noroeste de la provincia del Neuquén, República Argentina. Sobre la base del análisis microflorístico las capas portadoras de palinomorfos pueden asignarse al Oligoceno Tardío - Mioceno Temprano. Las rocas muestreadas se caracterizan por lutitas negras, gris verdosas, gris oscuras y castaño claras, alternando con niveles delgados, a veces oolíticos de calizas gris claras, con superficie de meteorización blanco amarillenta. Entre estas sedimentitas se intercalan andesitas, tobas y aglomerados volcánicos de composición mesosilícica. En los afloramientos del área del río Guañacos se observan capas irregulares de carbonato fibroso tanto como baritina nodular con estructura fibroradial, junto con bivalvos indeterminados de agua dulce. La asociación microflorística muestra relativamente baja diversidad. En general, el género Nothofagidites domina la asociación. Los componentes principales de la microflora consisten en granos de polen pertenecientes a varios taxones de angiospermas, tales como Baumannipollis sp. cf. B. variaperturatus, Corsinipollenites atlantica, Milfordia sp., Nothofagidites saraensis, Smilacipites sp. cf. S. echinatus and Tricolpites asperamarginis junto con granos de polen de angiospermas de Araucariacites australis, Equisetosporites notensis y Podocarpidites spp. Los elementos de Pteridophyta/Bryophyta están representados por Cyatheacidites annulatus, Cicatricosisporites sp., Deltoidospora sp., Lycopodiumsporites austroclavatidites, Ricciaesporites sp. y Laevigatosporites ovatus, mientras que entre los taxones lacustres se reconocieron Azolla sp. y Botryococcus sp. (Chlorophyta.Lacustrine sedimentary rocks referred to the Lileo Formation nov. cropping out near Los Miches locality, northwestern Neuquén Province, Argentine Republic, were sampled for

  12. Efecto de la aireación y la concentración de cloruro sódico en el desarrollo de la flora microbiológica y en los parámetros fisicoquímicos en la fermentación de Olea europaea L. c.v. Sevillana al estilo negras naturales en la zona de La Yarada-Tacna

    Directory of Open Access Journals (Sweden)

    Clavijo Koc, C.

    2013-06-01

    Full Text Available The aerobic fermentation of the table olive variety, Sevillana a black style, was carried out, taking into account the parameters of fermentation of fixed acidity between 1.2 to 1.5% and depended on the chloride concentration in the brine. This concentration was under 6.5% in the 9 treatments assayed, allowing for the lactic bacteria to develop. In the aerobic fermentation there were no differences in the decline of pH in relation to the anaerobic fermentation, which reached values below 3.5. The air effect is of great significance in the purge of the carbon dioxide in the brine. At the same time, the effect of air significantly affects the increase in aerobic yeast. The facultative anaerobic yeasts developed in the treatments with an initial salt level of 12% at the beginning of fermentation. The reduction of sugar concentration into the fruit decreased significantly in the treatment with air. Aerobic fermentation is more rapid than anaerobic fermentation.La fermentación aerobia de aceituna variedad Sevillana estilo negra se desarrolló en los parámetros de acidez fija entre de 1.2 a 1.5%, debido a la concentración de cloruros en la salmuera los cuales se mantuvieron por debajo de 6.5% durante el periodo de fermentación en los 9 tratamientos ensayados lo que permitió el desarrollo de bacterias lácticas. No hubo diferencia en la evolución del pH entre la fermentación con aireación o en condiciones anaeróbicas alcanzándose valores menores a 3.5. La aireación tiene un efecto significativo en la purga del CO2 en la salmuera e incrementó la población de levaduras aerobias; así mismo en los tratamientos con 12% de sal se favoreció el desarrollo de levaduras fermentativas al inicio de la fermentación. La concentración de azúcares reductores en el fruto disminuyó significativamente en los tratamientos con aireación, acelerando el proceso de fermentación con respecto a la fermentación anaerobia.

  13. Aloe vera na criopreservação do sêmen de tambaqui (Colossoma macropomum)

    OpenAIRE

    M.A.P. Melo-Maciel; L.V. Leite-Castro; J.S. Leite; M.S. Oliveira; P.S. Almeida-Monteiro; J. F. Nunes; C.S.B. Salmito-Vanderley

    2015-01-01

    This study aimed to evaluate the extract of Aloe vera (AV) associated or not with 10% Dimethylsulfoxide (DMSO) in cryopreservation of tambaqui semen. For the formation of the pools (n= 14), 30 males were hormonally induced twice. Each pool had the objective motility, curvilinear velocity, straight-line velocity, average path velocity and morphology analyzed before and after cryopreservation of semen. The means for cryopreservation were constituted of Powder Coconut Water-104 diluent added DMS...

  14. Transcriptomic Characterization of Tambaqui (Colossoma macropomum, Cuvier, 1818) Exposed to Three Climate Change Scenarios

    Science.gov (United States)

    Prado-Lima, Marcos; Val, Adalberto Luis

    2016-01-01

    Climate change substantially affects biodiversity around the world, especially in the Amazon region, which is home to a significant portion of the world’s biodiversity. Freshwater fishes are susceptible to increases in water temperature and variations in the concentrations of dissolved gases, especially oxygen and carbon dioxide. It is important to understand the mechanisms underlying the physiological and biochemical abilities of fishes to survive such environmental changes. In the present study, we applied RNA-Seq and de novo transcriptome sequencing to evaluate transcriptome alterations in tambaqui when exposed to five or fifteen days of the B1, A1B and A2 climate scenarios foreseen by the IPCC. The generated ESTs were assembled into 54,206 contigs. Gene ontology analysis and the STRING tool were then used to identify candidate protein domains, genes and gene families potentially responsible for the adaptation of tambaqui to climate changes. After sequencing eight RNA-Seq libraries, 32,512 genes were identified and mapped using the Danio rerio genome as a reference. In total, 236 and 209 genes were differentially expressed at five and fifteen days, respectively, including chaperones, energetic metabolism-related genes, translation initiation factors and ribosomal genes. Gene ontology enrichment analysis revealed that mitochondrion, protein binding, protein metabolic process, metabolic processes, gene expression, structural constituent of ribosome and translation were the most represented terms. In addition, 1,202 simple sequence repeats were detected, 88 of which qualified for primer design. These results show that cellular response to climate change in tambaqui is complex, involving many genes, and it may be controlled by different cues and transcription/translation regulation mechanisms. The data generated from this study provide a valuable resource for further studies on the molecular mechanisms involved in the adaptation of tambaqui and other closely related teleost species to climate change. PMID:27018790

  15. Growth curve by Gompertz nonlinear regression model in female and males in tambaqui (Colossoma macropomum).

    Science.gov (United States)

    De Mello, Fernanda; Oliveira, Carlos A L; Ribeiro, Ricardo P; Resende, Emiko K; Povh, Jayme A; Fornari, Darci C; Barreto, Rogério V; McManus, Concepta; Streit, Danilo

    2015-01-01

    Was evaluated the pattern of growth among females and males of tambaqui by Gompertz nonlinear regression model. Five traits of economic importance were measured on 145 animals during the three years, totaling 981 morphometric data analyzed. Different curves were adjusted between males and females for body weight, height and head length and only one curve was adjusted to the width and body length. The asymptotic weight (a) and relative growth rate to maturity (k) were different between sexes in animals with ± 5 kg; slaughter weight practiced by a specific niche market, very profitable. However, there was no difference between males and females up to ± 2 kg; slaughter weight established to supply the bigger consumer market. Females showed weight greater than males (± 280 g), which are more suitable for fish farming purposes defined for the niche market to larger animals. In general, males had lower maximum growth rate (8.66 g / day) than females (9.34 g / day), however, reached faster than females, 476 and 486 days growth rate, respectively. The height and length body are the traits that contributed most to the weight at 516 days (P <0.001). PMID:26628036

  16. Differential expression of a retrotransposable element, Rex6, in Colossoma macropomum fish from different Amazonian environments

    OpenAIRE

    Barbosa, Cassiane Martins; Mareco, Edson Assunção; Silva, Maeli Dal Pai; Martins, Cesar; Alves-Costa, Fernanda Antunes

    2014-01-01

    Transposable elements (TEs) are DNA sequences that have the ability to move and replicate within the genomes. TEs can be classified according to their intermediates of transposition, RNA (retrotransposons) or DNA. In some aquatic organisms, it has been observed that environmental factors such as pH, temperature and pollution may stimulate differential transcription and mobilization of retrotransposons. In light of this information, the present study sought to evaluate the expression of Rex6 T...

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

    OpenAIRE

    Marcos Tavares-Dias; Flávio Ruas de Moraes

    2010-01-01

    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...

  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. Cryopreservation of tambaqui (Colossoma macropomum) semen: extenders, cryoprotectants, dilution ratios and freezing methods.

    Science.gov (United States)

    Carneiro, P C F; Azevedo, H C; Santos, J P; Maria, A N

    2012-01-01

    The tambaqui is an Amazonian fish of great economic and environmental importance to Brazil and other South American countries. Several semen cryopreservation methodologies have been tested for different Brazilian fish species; however, there is little information on the use of this technique on tambaqui semen. The aim of the present study was to investigate the effect of osmolarity and activation solutions on sperm kinetics and, glucose solutions, cryoprotectants, dilution ratios, egg yolk and freezing methods on tambaqui semen freezing. The osmolarity of 230 mOsm was suitable for simultaneously yielding higher sperm motility (85%) and motility time (54 sec.) and osmolarities above 360 mOsm maintain immobile tambaqui sperm. The tambaqui semen can be successfully cryopreserved when diluted 1:9 in freezing medium composed of 5 percent glucose solution (290 mOsm) with 10 percent methylglycol and 5 percent egg yolk, and frozen directly in a dry shipper container. PMID:23224371

  20. Transcriptomic Characterization of Tambaqui (Colossoma macropomum, Cuvier, 1818) Exposed to Three Climate Change Scenarios.

    Science.gov (United States)

    Prado-Lima, Marcos; Val, Adalberto Luis

    2016-01-01

    Climate change substantially affects biodiversity around the world, especially in the Amazon region, which is home to a significant portion of the world's biodiversity. Freshwater fishes are susceptible to increases in water temperature and variations in the concentrations of dissolved gases, especially oxygen and carbon dioxide. It is important to understand the mechanisms underlying the physiological and biochemical abilities of fishes to survive such environmental changes. In the present study, we applied RNA-Seq and de novo transcriptome sequencing to evaluate transcriptome alterations in tambaqui when exposed to five or fifteen days of the B1, A1B and A2 climate scenarios foreseen by the IPCC. The generated ESTs were assembled into 54,206 contigs. Gene ontology analysis and the STRING tool were then used to identify candidate protein domains, genes and gene families potentially responsible for the adaptation of tambaqui to climate changes. After sequencing eight RNA-Seq libraries, 32,512 genes were identified and mapped using the Danio rerio genome as a reference. In total, 236 and 209 genes were differentially expressed at five and fifteen days, respectively, including chaperones, energetic metabolism-related genes, translation initiation factors and ribosomal genes. Gene ontology enrichment analysis revealed that mitochondrion, protein binding, protein metabolic process, metabolic processes, gene expression, structural constituent of ribosome and translation were the most represented terms. In addition, 1,202 simple sequence repeats were detected, 88 of which qualified for primer design. These results show that cellular response to climate change in tambaqui is complex, involving many genes, and it may be controlled by different cues and transcription/translation regulation mechanisms. The data generated from this study provide a valuable resource for further studies on the molecular mechanisms involved in the adaptation of tambaqui and other closely related teleost species to climate change. PMID:27018790

  1. Farelo de licuri em dietas para alevinos de tambaqui (Colossoma Macropomum, Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    D.F.B. Campeche

    2014-04-01

    Full Text Available A busca de alimentos alternativos para a fabricação de ração para peixes tem se tornado constante. No entanto, é essencial que, além de ter ótimo aproveitamento pela espécie, este alimento esteja disponível ao longo do ano. Deste modo, o objetivo do presente trabalho foi avaliar o efeito da substituição do farelo de milho pelo farelo de licuri sobre o desempenho de alevinos de tambaqui. Três tratamentos de níveis de substituição de milho pelo farelo de licuri (33,33%; 66,66% e 100% foram avaliados e comprados com a dieta controle. Os alevinos, com peso inicial médio de 3,18±0,5g, foram distribuídos em caixas de água de 250L, contendo cada uma, inicialmente, 16 animais. Os alevinos foram alimentados três vezes ao dia, a uma taxa de 5% da biomassa total, durante o período de 50 dias. A cada 10 dias eram realizadas biometrias. Ao final do experimento, foram avaliados parâmetros de desempenho zootécnico e foi feita avaliação bromatológica da carcaça. Não houve diferença significativa entre os tratamentos, para os parâmetros: peso final, ganho de peso, conversão alimentar, eficiência alimentar, sobrevivência e crescimento, somente para o consumo de ração, que foi significativamente menor quando houve 100% de substituição. Neste tratamento também houve maior porcentagem de proteína bruta e menor teor de extrato etéreo na carcaça.

  2. Aloe vera na criopreservação do sêmen de tambaqui (Colossoma macropomum

    Directory of Open Access Journals (Sweden)

    M.A.P. Melo-Maciel

    2015-06-01

    Full Text Available This study aimed to evaluate the extract of Aloe vera (AV associated or not with 10% Dimethylsulfoxide (DMSO in cryopreservation of tambaqui semen. For the formation of the pools (n= 14, 30 males were hormonally induced twice. Each pool had the objective motility, curvilinear velocity, straight-line velocity, average path velocity and morphology analyzed before and after cryopreservation of semen. The means for cryopreservation were constituted of Powder Coconut Water-104 diluent added DMSO and/or AV (5 or 10%. After cryopreservation, motility, velocities and morphology were reduced significantly when compared to fresh semen. For sperm motility the best treatment was that using only DMSO (20,86±8,31 and DMSO + 5% AV (15.71±9.77. For the velocities, the worse treatment was DMSO+10% AV. Treatment with only the addition of DMSO had a significantly higher effect than others on percentage of morphologically normal sperm. The mean correlation found was between motilityand the rate of morphologically normal sperm (r = 0.687. In conclusion, the addition of AV does not provide greater protection for spermatozoa during cryopreservation.

  3. A catastrophic landslide near Rampac Grande in the Cordillera Negra, northern Peru

    Czech Academy of Sciences Publication Activity Database

    Klimeš, Jan; Vilímek, V.

    2011-01-01

    Roč. 8, č. 3 (2011), s. 309-320. ISSN 1612-510X Institutional research plan: CEZ:AV0Z30460519 Keywords : landslide * precipitation * evapotranspiration Subject RIV: DE - Earth Magnetism, Geodesy, Geography Impact factor: 2.216, year: 2011 http://www.springerlink.com/content/911l1026vr358424/

  4. Caracterización experimental de escorias negras de alto horno

    OpenAIRE

    González Ortega, Martha Alejandra

    2011-01-01

    En el ámbito de la construcción se utilizan recursos naturales que son no renovables los cuales son la materia prima para el hormigón, por lo tanto se cree necesario buscar alternativas de reutilización y reciclaje de residuos para sustituir estos por las materias primas, todo esto nos traerá consecuencias positivas, tanto para su conservación, es decir, un desarrollo sostenible, así como alternativa económica para la ejecución de obras. Uno de los residuos más producidos son los que se re...

  5. Sistemas binarios viuda negra: conectando sus orígenes con su estado final

    Science.gov (United States)

    Benvenuto, O. G.; De Vito, M. A.; Horvath, J. E.

    ``Black widow'' systems are located in a well determined region of the plane (where is the mass of the pulsar companion and is the orbital period of the system). An attempt has been made to understand which are the mechanisms that lead to companions of ``black widows'' to be located in this region; since standard binary evolution does not provide a satisfactory response. From our evolutionary calculations; we study the path performed in the plane by a binary system to reach the state of ``black widow''. We also discuss whether there is a connection between ``redbacks'' and ``black widows''. FULL TEXT IN SPANISH

  6. O PENSAR E O FAZER EDUCACIONAL DAS ORGANIZAÇÕES NEGRAS BAIANAS

    Directory of Open Access Journals (Sweden)

    Jurandir de Almeida Araújo

    2014-03-01

    Full Text Available This article originated from a qualitative research concerns the role of Bahian black organizations in the field of education in the period 1970-1990, aims to reveal the influence of the above organizations in the construction and promotion of the education of ethnic and race relations in schools Bahia. Based on statements from militants / black teachers, committed to a pluralistic education in Bahia in the investigated period and theorists who discuss the subject, it can be stated that different Bahian black organizations that emerged from the 1970s, have been developing activities social, cultural and educational for exploiting the black and its culture, significantly contributing to the advances that have been in the field of educational policy statements.http://dx.doi.org/10.14572/nuances.v25i1.2635

  7. Consciência negra, justiça ambiental e sustentabilidade

    OpenAIRE

    Valdir Lamin-Guedes

    2013-01-01

    One of the goals of working with Black consciousness is showing how Brazil is marked by racial differentiation and discrimination, once the issue of racism has been almost permanently denied, both inside and outside country. We are all invited to think about the inclusion of Blacks in the Brazilian society, as well as about the environmental injustice they are subject to. As a population less endowed with financial, political and/or informational resources, Black people experience a dispropor...

  8. Élite negra en sociedad esclavista: Recife (Brasil) c. 1654-1744

    OpenAIRE

    Raminelli, Ronald

    2011-01-01

    En 1737, un ex-militar negro creó en Recife una cofradía, en la que reunió jóvenes negros libres y esclavos. El comportamiento heterodoxo del grupo provocó rumores, despertando la reacción del obispo de Pernambuco. Sospechosos de herejía, dos militares fueron enviados a la cárcel del Santo Oficio en Lisboa. Con ese proceso, el artículo analiza las denuncias contra la cofradía (frailería) y los conflictos entre sacerdotes seculares y militares negros. Intenta sobre todo identificar las trabas ...

  9. Trabajando la cultura: Sobre la construcción de la identidad negra en Aguablanca, Cali

    Directory of Open Access Journals (Sweden)

    Peter Wade

    2008-12-01

    Full Text Available Existe una tensión en la teoría social entre los enfoques que privilegian la práctica y aquellos que parten del discurso. En el análisis de los movimientos sociales este dualismo ha sido recientemente cuestionado desde perspectivas que buscan sobreponerse a la división entre cultura y política. Sostengo que esos cuestionamientos pueden ser fomentados concentrándose en la tensión entre la cultura como una actividad humana de trabajar en el mundo, en la que lo material y lo simbólico están unificados, y la cultura como un objeto mercantilizado en el contexto de construcciones hegemónicas que la construyen principalmente como un conjunto de representaciones simbólicas. Examino esta temática en relación con los esfuerzos de jóvenes negros en el distrito de Aguablanca, que utilizan la música y el baile rap para forjar una identidad cultural como una forma de vida, al mismo tiempo que construyen su cultura como un objeto diseñado pafa moverse en circuitos mercantiles, estatalesv de ONG's.

  10. Caracterización de ectomicorrizas en encinares productores de trufa negra del noreste de Soria

    OpenAIRE

    Agueda, B. (Beatriz); Fernandez-Toiran, L.M. (Luz Marina); Miguel Velasco, A.M. (Ana Maria) de; Martinez-Peña, F. (Fernando)

    2010-01-01

    Black truffle sporocarp production is determined, amongst many other factors, by an optimum mycorrhization degree in the roots of the host-tree. This process is triggered in balance with other fungal species that does not inhibit its sporocarp production. So, there is an ectomycorrhizal fungal community associated with the black truffle sporocarp productive host-trees that runs as any other living beings community, producing a certain fungal biodiversity and establishing connections in dyn...

  11. Efeito do volume do tanque-rede na produtividade de tambaqui (Colossoma macropomum durante a recria Effect of cage volume on productivity of tambaqui (Colossoma macropomum during second growth phase

    Directory of Open Access Journals (Sweden)

    Levy de Carvalho Gomes

    2004-01-01

    Full Text Available O objetivo desta nota foi avaliar o efeito do volume do tanque-rede na produtividade de juvenis de tambaqui durante a recria. Juvenis de tambaqui foram criados por 60 dias, na densidade de 300 peixes/m³, em tanques-rede de dois diferentes volumes: 1 e 6 m³. Foram avaliados parâmetros de crescimento e de produtividade final. Não houve diferença no crescimento em peso e em comprimento. O coeficiente de variação do comprimento foi significativamente menor para os peixes do tanque-rede pequeno. A sobrevivência, produção por volume e o ganho de peso não diferiram entre os tratamentos. Os peixes do tanque de maior volume foram significativamente mais eficientes na conversão alimentar. A recria pode ser realizada em tanques dos dois volumes testados sem prejuízo zootécnico para o criador.The goal of this note was to evaluate the effect of cage volume on the productivity of juvenile tambaqui during second growth phase. Tambaqui juveniles were raised for 60 days on a density of 300 fish/m³, in two different volumes cage: 1 and 6 m³. We evaluated growth and productivity parameters. There are no differences in fish weight and length. The coefficient of variation of length was significantly lower for fish in the small volume cage. There was no differences in survival, volume production, and weight gain between treatments. Fish from the larger volume cage were significantly more efficient in food conversion. The second growth phase may be undertaken in both cage volumes without losses to fish farmers.

  12. Dietary tissue cadmium accumulation in an amazonian teleost (Tambaqui, Colossoma macropomum Cuvier, 1818) Acúmulo dietário de cádmio em tecidos de um teleósteo Amazônico (Tambaqui, Colossoma macropomum)

    OpenAIRE

    AYO. Matsuo; AL. Val

    2007-01-01

    Understanding the effects of metal contamination in the Amazon basin is important because of the potential impact on this region of high biodiversity. In addition, the significance of fish as the primary source of protein for the local human population (living either alongside the Amazon River or in the city of Manaus) highlights the need for information on the metal transfer through the food chain. Bioaccumulation of metals in fish can occur at significant rates through the dietary route, wi...

  13. Profit of solar energy for salting and drying of a brazilian fish Colossoma mitrei Berg, 1895; Utilizacao da energia solar para avaliacao da salga e secagem do pacu, Colossoma mitrei Berg, 1895

    Energy Technology Data Exchange (ETDEWEB)

    Sales, Ronaldo de Oliveira [1Ceara Univ., Fortaleza, CE (Brazil). Centro de Ciencias Agrarias; Beirao, Luiz Henrique [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Ciencias e Tecnologia de Alimentos

    1986-12-01

    This paper studied a simple method for processing dried-salted `pacu` fish. The average weight in relation to total weight was 58,6% and the result came very close to the average of weight of other dried salted fishes, when treated in same way. The main purpose of this process was to reduce the long time expanded by the conventional process, allowing to reduce the humidity of the dried-salted product from 56 to 43,5% in 28 hours only. (author) 20 refs., 3 figs., 8 tabs.

  14. Efeito do volume do tanque-rede na produtividade de tambaqui (Colossoma macropomum) durante a recria Effect of cage volume on productivity of tambaqui (Colossoma macropomum) during second growth phase

    OpenAIRE

    Levy de Carvalho Gomes; Franmir Rodrigues Brandão; Edsandra Campos Chagas; Marcelo Frabizio Barroncas Ferreira; José Nestor de Paula Lourenço

    2004-01-01

    O objetivo desta nota foi avaliar o efeito do volume do tanque-rede na produtividade de juvenis de tambaqui durante a recria. Juvenis de tambaqui foram criados por 60 dias, na densidade de 300 peixes/m³, em tanques-rede de dois diferentes volumes: 1 e 6 m³. Foram avaliados parâmetros de crescimento e de produtividade final. Não houve diferença no crescimento em peso e em comprimento. O coeficiente de variação do comprimento foi significativamente menor para os peixes do tanque-rede pequeno. A...

  15. Effects of herbicide on the kidneys of two Venezuelan cultured fish: Caquetaia kraussii and Colossoma macropomum (Pisces: Ciclidae and Characeae).

    Science.gov (United States)

    Bravo, M I Segnini de; Medina, J; Marcano, S; Finol, H J; Boada-Sucre, A

    2005-05-01

    The use of chemical pesticides and herbicides has increased environmental pollution and affected ichthyofauna in the watersheds where they are used. We studied the effect of an herbicide, triazine, on the kidneys of two species (Caquetaia kraussii and Colossomna macropomum) widely found in Caribbean and South American rivers. In Venezuela, these species are abundant and have a high aquaculture potential because they may be cultured and reproduced in captivity. Four kidney samples from juveniles of each species exposed to the herbicide were examined by Transmission Electron Microscopy. Kidney tubule alterations included loss of plasmalemma and cell interdigitations, misshaped mitochondria, decrease in rough endoplasmic reticulum and free polysomes, and the presence of autophagic vacuoles and primary lysosomes. These alterations at the cellular level may explain fish behaviour in terms of kidney tubule pathology, and relative amounts and conditions of organelles within affected cells. PMID:17465144

  16. 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. PMID:19802458

  17. Los depósitos de bentonita de Barda Negra y cerro Bandera, departamento Zapala, provincia del Neuquén, Argentina Bentonite deposits of Barda Negra and Cerro Bandera, Zapala Department, Neuquén Province, Argentina

    Directory of Open Access Journals (Sweden)

    A. Impiccini

    2002-09-01

    Full Text Available Las bentonitas de la región nordpatagónica pueden ser agrupadas en dos distritos mineralogenéticos caracterizados desde el punto de vista geológico, geográfico y estratigráfico. En este trabajo se considera a las bentonitas terciarias localizadas en la región occidental, en el departamento Zapala, provincia del Neuquén. Los depósitos consisten en estratos lenticulares, subhorizontales, de 2 a 15 metros de espesor, la mayoría de ellos aflorantes. Están incluidos en la Formación Collón Curá, una secuencia miocena continental donde alternan tobas y areniscas. Los cuerpos de arcilla son productos de alteración de materiales piroclásticos vítreos en ambientes húmedos confinados, tales como cuerpos de agua someros. Los análisis por difracción de rayos X muestran que prevalece una esmectita dioctaédrica - montmorillonita - como único mineral arcilloso en la mayoría de los depósitos. Los minerales accesorios son cuarzo, feldespato, plagioclasa y cristobalita (ópalo-CT, y en menor proporción, ceolitas y yeso. El Na+ es el ión intercambiable dominante, junto con Ca++, Mg++ y K+. El contenido en Fe2O3 es muy alto. Estas bentonitas son buenos agentes ligantes en arenas de moldeo para fundición, pero sus propiedades reológicas y el test de filtrado no cumplen exactamente con las normas API para lodos de perforación de petróleo.Bentonites from the North Patagonia region can be grouped in two mineralogenic districts distinguishable on geological, geographical, and stratigraphical criteria. In this paper, we consider the Tertiary bentonites located in the western region, Zapala Department, Neuquén Province. The deposits occur in sub-horizontal lenticular beds, 2 to 15 m in thickness, most of which crop out at the surface. They lie within the Collón Curá Formation, a Miocene continental sequence of alternating tuffs and sandstones. The clay bodies are alteration products of pyroclastic glassy materials in confined wet environments, like shallow-water bodies. XRD analysis shows that a dioctahedral smectite -montmorillonite- prevails and is the only clay mineral occurring in the majority of the deposits. Accessory minerals are quartz, feldspar, plagioclase and cristobalite (opal-CT, with lesser amounts of zeolites and gypsum. Na+ is the dominant exchangeable ion, along with Ca++, Mg++ and K+. The Fe2O3 content is very high. The bentonites are good bonding agents in foundry molding sands, but their rheological and leak test properties do not match exactly with API regulations for oil-drilling muds.

  18. Los depósitos de bentonita de Barda Negra y cerro Bandera, departamento Zapala, provincia del Neuquén, Argentina Bentonite deposits of Barda Negra and Cerro Bandera, Zapala Department, Neuquén Province, Argentina

    OpenAIRE

    A. Impiccini; J. M. Vallés

    2002-01-01

    Las bentonitas de la región nordpatagónica pueden ser agrupadas en dos distritos mineralogenéticos caracterizados desde el punto de vista geológico, geográfico y estratigráfico. En este trabajo se considera a las bentonitas terciarias localizadas en la región occidental, en el departamento Zapala, provincia del Neuquén. Los depósitos consisten en estratos lenticulares, subhorizontales, de 2 a 15 metros de espesor, la mayoría de ellos aflorantes. Están incluidos en la Formación Collón Curá, un...

  19. “Eu nasci branquinha”: Construção da identidade negra no espaço escolar

    OpenAIRE

    Priscila da Cunha Bastos

    2015-01-01

    Educational inequalities between whites and blacks in Brazil, regarding the school years, have been decreasing, but the distance is still large and racial exclusion in education goes throughout generations. Many everyday situations reaffirm the need to act towards an anti-racist and anti-sexist education. By describing the racial drama of a six-year-old pupil, the paper intends to reflect on the school's role in the construction of gender and race identity process. The case occurred in a fede...

  20. Frames y prácticas discursivas entre Estado y poblaciones negras en Colombia: racismo estructural y derechos humanos

    OpenAIRE

    Adriana Espinosa Bonilla

    2014-01-01

    Frames and Discursive Practices between State and Black Populations in Colombia: Structural Racism and Human Rights Abstract This article discusses the way the discourses and counter-discourses have been used in the construction of frames on behalf of the actor-network, Process of Black Communities, in its dialogue with the Colombian government within the framework of the hearings of the Inter-american Commission on Human Rights (IACHR) between 2007 and 2013. Theoretically, the notio...

  1. Frames y prácticas discursivas entre Estado y poblaciones negras en Colombia: racismo estructural y derechos humanos

    Directory of Open Access Journals (Sweden)

    Adriana Espinosa Bonilla

    2014-06-01

    Full Text Available Frames and Discursive Practices between State and Black Populations in Colombia: Structural Racism and Human Rights Abstract This article discusses the way the discourses and counter-discourses have been used in the construction of frames on behalf of the actor-network, Process of Black Communities, in its dialogue with the Colombian government within the framework of the hearings of the Inter-american Commission on Human Rights (IACHR between 2007 and 2013. Theoretically, the notions of biopower, biopolitics, governmentality and discursive practices developed by Michel Foucault are addressed , as well as the theory of frames by Snow and Bendford. Methodologically, audios and videos of the hearings before the Commission are analyzed. In the analysis of the interaction between State and Afro petitioners there were identified frames, discourses and counter-discourses related to racism, territoriality, victimization of afro populations and women, and armed conflict. The findings identify frames around the issue of human rights, aimed at harnessing the discursive and political opportunities opened by the Commission to influence the decisions of the state actor.

  2. La Ley 70 de 1993 y la participación política de las comunidades negras

    OpenAIRE

    Alejandra Erazo Gómez

    2012-01-01

    El siguiente documento se elaboró como una reflexión en el marco de las dos décadas de promulgación de la Constitución de 1991, la cual enuncia el carácter multicultural y pluriétnico de la nación colombiana. Nuestra Carta Política se inscribe en la ola del multiculturalismo que se institucionalizó justamente en esa década como la forma hegemónica de pensar las diferencias culturales. Este artículo quiere recoger los planteamientos sobre participación política de grupos afrocolombianos consag...

  3. La Ley 70 de 1993 y la participación política de las comunidades negras

    Directory of Open Access Journals (Sweden)

    Alejandra Erazo Gómez

    2012-12-01

    Full Text Available El siguiente documento se elaboró como una reflexión en el marco de las dos décadas de promulgación de la Constitución de 1991, la cual enuncia el carácter multicultural y pluriétnico de la nación colombiana. Nuestra Carta Política se inscribe en la ola del multiculturalismo que se institucionalizó justamente en esa década como la forma hegemónica de pensar las diferencias culturales. Este artículo quiere recoger los planteamientos sobre participación política de grupos afrocolombianos consagrados en la Constitución de 1991 y en la Ley 70 de 1993, proponiendo un ejercicio de confrontación con las prácticas reales de participación de estos grupos. Para éste propósito el ensayo se estructura en tres partes. La primera presenta los fundamentos teóricos del multiculturalismo, acción política y el contexto de modernidad. La segunda parte señala algunos antecedentes apropósito de la participación política de estas comunidades. Y la tercera parte se hace referencia a las condiciones actuales de participación resaltando los problemas y dificultades que han experimentado.

  4. Suicidio en azul con negra mancha. Breve historia de un balazo en la pintura de Pablo Picasso

    Directory of Open Access Journals (Sweden)

    Godoy C., Ivan

    2013-12-01

    Full Text Available Paris 1901: unrequited love drove Carles Casagemas, a close friend of Pablo Picasso’s youth, to commit suicide by shooting himself in the head. This tragic event was a major blow to Picasso, causing him to dwell upon the subject of death and express his “mourning” through his paintings. The “bullet hole” in his friend’s temple symbolically displaced several areas of the young Picasso’s life and became a “deep vacuum” and “melancholy”, permeating various areas in Picasso’s paintings, and marking the start of his famous blue period.París 1901: por el amor de una mujer, se suicida de un balazo en la cabeza Carles Casagemas, amigo íntimo de juventud de Pablo Picasso. Este trágico suceso producirá un gran dolor en el artista, el cual, lo hará internarse en el tema de la muerte y elaborar su “duelo” apoyado en su pintura. El “hoyo a bala” en la sien de su amigo se desplazará simbólicamente a varios espacios de la vida del joven Picasso y devendrá en “vacío profundo” y “melancolía”, permeando diferentes ámbitos dentro de la pintura de Picasso, dando comienzo a su mentado período azul.

  5. Líquenes de Pueblo Libre, una localidad andina en la Cordillera Negra (Huaylas, Ancash, Perú

    Directory of Open Access Journals (Sweden)

    Ángel Ramírez

    2013-05-01

    Full Text Available El presente trabajo informa los resultados del estudio de la liquenobiota de la localidad andina de Pueblo Libre, (09º05’30’’ - 09º10’15’’ S y 77º47’30’’ - 77º52’50’’ W en Huaylas, Ancash, Perú. Las colectas se realizaron desde los 2200 hasta los 4450 m de altitud. El presente trabajo da a conocer 38 especies, agrupadas en 29 géneros y 17 familias y además del grupo imperfecto. Se presentan claves para familias, géneros y especies. Para cada especie se presenta una descripción macroscópica y microscópica y de reacción química, asimismo se menciona el hábitat y material examinado.

  6. Sentido e impacto de la participación negra en la guerra de la independencia de Cuba

    Directory of Open Access Journals (Sweden)

    Helg, Aline

    1998-04-01

    Full Text Available Blacks joined en masse the struggle for Cuba's independence from its beginning. In the process, many increased their expectations regarding their position in an igualitarian future. This article explores some dimensions of Afro-Cubans' war experiences and discusses the concerns their massive participation raised among certain white separatist leaders who did not hesitate to jeopardize Cuba Libre's most decisive victory against Spain and to lobby for U.S. intervention in order to limit the revolutionary potential of the war.

    Desde sus comienzos, los negros se unieron en masa a la lucha por la independencia de Cuba. En el proceso, muchos forjaron grandes expectativas en cuanto a su posición en un futuro igualitario. Este ensayo investiga algunos de los aspectos de la experiencia de los cubanos de color en la guerra y examina las preocupaciones que su participación masiva provocó entre algunos líderes separatistas blancos quienes no vacilaron en frustrar la victoria más decisiva de Cuba Libre contra España, ni en cabildear a favor de la intervención de EEUU con el propósito de limitar el potencial revolucionario de la guerra.

  7. Teoría de las Contingencias Múltiples Dinámicamente Entrelazadas (Abriendo la caja negra del ajuste contingente

    Directory of Open Access Journals (Sweden)

    Lic. Jorge Washington Barrientos

    2013-12-01

    Full Text Available La teoría de las contingencias ha ocupado un rol destacado en el estudio del diseño de las estructuras organizacionales en los últimos cincuenta años. Sus contribuciones se han dirigido en distintas direcciones, una de ellas ha sido enumeración de factores de contingencia y la posterior identificación de relaciones entre estos y los elementos estructurales.Refinamientos posteriores han conceptualizado la respuesta sistémica que permite el ajuste (“fit” de la organización a los cambios en los factores de contingencia.Este trabajo se propone repasar críticamente las principales conceptualizaciones del ajuste estructural, y a la vez proponer una nueva variable interviniente en el marco de una teoría de contingencias múltiples dinámicamente entrelazadas.

  8. Nuevo sitio de anidamiento del Albatros Ceja Negra, DIOMEDEA MELANOPHRIS TEMMINK 1828, en el Seno Almirantazgo, Tierra del Fuego, Chile

    OpenAIRE

    Aguayo, Anelio; Acevedo, Jorge; Acuña, Paola

    2003-01-01

    Con motivo de la realización de la segunda prospección de mamíferos marinos en seno Almirantazgo, Tierra del Fuego, realizada por el Grupo de Biología Marina del Centro de Estudios del Cuaternario Fuego-Patagonia y Antártica (CEQUA), realizada a bordo del yate “Chonos”, el 18 de enero de 2003, entre las 09:40 h y 11:30 h, se permaneció en las aguas circundantes del islote Albatros (54°27´20´´S; 69°01´12´´W), hallando el lugar de anidamiento en forma accidental....

  9. Suicidio en azul con negra mancha. Breve historia de un balazo en la pintura de Pablo Picasso

    OpenAIRE

    Godoy C., Ivan

    2013-01-01

    Paris 1901: unrequited love drove Carles Casagemas, a close friend of Pablo Picasso’s youth, to commit suicide by shooting himself in the head. This tragic event was a major blow to Picasso, causing him to dwell upon the subject of death and express his “mourning” through his paintings. The “bullet hole” in his friend’s temple symbolically displaced several areas of the young Picasso’s life and became a “deep vacuum” and “melancholy”, permeating various areas in Picasso’s paintings, and marki...

  10. Absolute paleointensity of the Earth's magnetic field during Jurassic: case study of La Negra Formation (northern Chile)

    Science.gov (United States)

    Morales, Juan; Goguitchaichvili, Avto; Alva-Valdivia, Luis M.; Urrutia-Fucugauchi, Jaime

    2003-08-01

    We carried out a detailed rock-magnetic and paleointensity study of the ˜187-Ma volcanic succession from northern Chile. A total of 32 consecutive lava flows (about 280 oriented standard paleomagnetic cores) were collected at the Tocopilla locality. Only 26 samples with apparently preserved primary magnetic mineralogy and without secondary magnetization components were pre-selected for Thellier paleointensity determination. Eleven samples coming from four lava flows yielded reliable paleointensity estimates. The flow-mean virtual dipole moments range from 3.7±0.9 to 7.1±0.5 (10 22 A m 2). This corresponds to a mean value of (5.0±1.8)×10 22 A m 2, which is in reasonably good agreement with other comparable quality paleointensity determinations from the Middle Jurassic. Given the large dispersion and the very poor distribution of reliable absolute intensity data, it is hard to draw any firm conclusions regarding the time evolution of the geomagnetic field. To cite this article: J. Morales et al., C. R. Geoscience 335 (2003).

  11. Histórias de resistência de mulheres negras Resistance stories of African-Brazilian women

    Directory of Open Access Journals (Sweden)

    Stela Nazareth Meneghel

    2005-12-01

    Full Text Available Esta é uma pesquisa intervenção na qual foram usadas oficinas de narrativas de histórias como dispositivo para estimular o empoderamento de mulheres. Essas oficinas, que contaram com a participação de dez mulheres em situação de violência de gênero, foram realizadas na sede da organização não-governamental Maria Mulher, situada na Vila Cruzeiro do Sul, no município de Porto Alegre. A partir de oficinas de narrativas de histórias em que se tematizaram histórias do feminino, especialmente afro-brasileiras, a pesquisa teve como objetivo principal compreender o que acontece com as mulheres que sofreram ou sofrem violência. Realizadas em cinco encontros nos quais as mulheres contaram e ouviram histórias e participaram de vivências, as oficinas oportunizaram espaço para narrar, ouvir e ritualizar as histórias das orixás e ressignificar as vidas a partir dessas vivências. Essa intervenção operou com as subjetividades das mulheres que fizeram parte da pesquisa e mostrou-se capaz de fortalecer algumas delas. A experiência constituiu um dispositivo de estímulo ao empoderamento das mulheres e contribuiu para o resgate da memória individual e coletiva desse grupo.This study consists of an intervention using narrative workshops as a device to stimulate the empowerment of women. Ten women, victims of gender violence, took part in a workshop developed by non-governmental organization for African-Brazilian women Maria Mulher, which gives assistance to women living in Vila Cruzeiro do Sul, in the city of Porto Alegre. The main objective of the research was to debate questions related to gender and violence, making use of stories and histories related to the feminine, specifically African-Brazilian stories. Five meetings were held, where the women told and were told stories, took part in group discussions, experiences and rituals. The workshops gave those women a space where they could tell and hear stories, take part in the rituals of the orixás [African-Brazilian deities] of the black culture and tell their personal histories using those experiences. This intervention was an attempt at invoking different subjective experiences, and made it possible to empower the women who took part in the research, contributing for the rescue of the individual and collective memory of this group.

  12. LITERATURA DE AUTORIA FEMININA NEGRA: (DESSILENCIAMENTOS E RESSIGNIFICAÇÕES (LITERATURE OF BLACK FEMINE AUTHORSHIP: (DESILENCE AND NEW MEANINGS

    Directory of Open Access Journals (Sweden)

    Ana Rita Santiago da Silva

    2010-06-01

    Full Text Available It is difficult to find in Brazilian literature works in which discursive constructions and narratives of women appear figured by male power. Prevail in them, for example, preachings of black female characters overwhelmed not only by patriarchy, as well as representations surrounded by traces of inferiority, virility and strong negative valuation of their ethnic and cultural diversity. When you add the fact that the invisibility of black women's writing, the scene of literary tradition, we can more easily understand the literature you want distinctive, innovative and transgressive, produced by them. Thus, this text will make an interpretative reading practices (un silencing of literary authorship and literary voices of black women writers, who, as discursive formations, march away from stigmas and deletions and coming brands of otherness.

  13. Dosimetry and mutation induction with cobalt-60, on the three potato species: sani imilla, imilla negra and waycha pacena

    International Nuclear Information System (INIS)

    This paper presents the research on dosimetry of three species of the potato widely consumed in the bolivian plateau, aiming to obtain the optimum irradiation doses to induce mutations for the research to come

  14. Sequential extraction applied to Peruibe black mud, SP, Brazil; Extracao sequencial aplicada a lama negra de Peruibe

    Energy Technology Data Exchange (ETDEWEB)

    Torrecilha, Jefferson Koyaishi

    2014-07-01

    The Peruibe Black mud is used in therapeutic treatments such as psoriasis, peripheral dermatitis, acne and seborrhoea, as well as in the treatment of myalgia, arthritis, rheumatism and non-articular processes. Likewise other medicinal clays, it may not be free from possible adverse health effects due to possible hazardous minerals leading to respiratory system occurrences and other effects, caused by the presence of toxic elements. Once used for therapeutic purposes, any given material should be fully characterized and thus samples of Peruibe black mud were analyzed to determine physical and chemical properties: moisture content, organic matter and loss on ignition; pH, particle size, cation exchange capacity and swelling index. The elemental composition was determined by Neutron Activation Analysis, Atomic Absorption Graphite Furnace and X-ray fluorescence; the mineralogical composition was determined by X-ray diffraction. Another tool widely used to evaluate the behavior of trace elements, in various environmental matrices, is the sequential extraction. Thus, a sequential extraction procedure was applied to fractionate the mud in specific geochemical forms and verify how and how much of the elements may be contained in it. Considering the several sequential extraction procedures, BCR-701 method (Community Bureau of Reference) was used since it is considered the most reproducible among them. A simple extraction with an artificial sweat was, also, applied in order to verify which components are potentially available for absorption by the patient skin during the topical treatment. The results indicated that the mud is basically composed by a silty-clay material, rich in organic matter and with good cation exchange capacity. There were no significant variations in mineralogy and elemental composition of both, in natura and mature mud forms. The analysis by sequential extraction and by simple extraction indicated that the elements possibly available in larger quantities to be absorbed by the skin during treatment are Ca, Mg, Mn and Na. (author)

  15. PROPRIEDADES MECÂNICAS DE CHAPAS AGLOMERADAS ESTRUTURAIS FABRICADAS COM MADEIRAS DE PINUS, EUCALIPTO E ACÁCIA-NEGRA

    Directory of Open Access Journals (Sweden)

    Éverton Hillig

    2001-10-01

    Full Text Available Neste trabalho, foram analisadas as propriedades mecânicas de chapas aglomeradas estruturais, fabricadas com madeiras de Pinus elliottii Engelm, Eucalyptus grandis W. Hill ex-Maiden e Acacia mearnsii De Wild. Buscou-se segregar os efeitos da densidade básica da madeira, instalando-se um experimento no delineamento blocos ao acaso em que taxas de compressão de 1,21, 1,32 e 1,43 constituíram os blocos. Quinze tratamentos onde cada espécie participou com 0, 25, 50, 75 ou 100% de proporção em peso seco, foram utilizados para fabricação de chapas aglomeradas estruturais, com partículas de dimensões médias de 90 x 20 x 0,6 mm e coladas com 8% de adesivo à base de tanino-formaldeído. As análises foram realizadas por meio da correlação e ajuste de modelos matemáticos, obtidos por regressão linear simples ou múltipla, entre as variáveis de produção e a proporção de cada espécie na mistura. Os valores obtidos para MOR e MOE ficaram acima dos padrões de qualidade internacionais, no entanto, as chapas apresentaram baixos valores de ligação interna demostrando baixa qualidade de colagem. Como conclusão geral, a mistura de espécies foi mais vantajosa que a utilização de cada espécie individualmente, principalmente em razão da influência das diferentes densidades básicas de cada madeira sobre as propriedades das chapas. A melhor mistura, porém, tem de ser determinada em razão do uso do produto final e da disponibilidade de matéria- -prima.

  16. The role of branchial and orobranchial O2 chemoreceptors in the control of aquatic surface respiration in the neotropical fish tambaqui (Colossoma macropomum): progressive responses to prolonged hypoxia.

    Science.gov (United States)

    Florindo, Luiz H; Leite, Cléo A C; Kalinin, Ana L; Reid, Stephen G; Milsom, William K; Rantin, F Tadeu

    2006-05-01

    The present study examined the role of branchial and orobranchial O(2) chemoreceptors in the cardiorespiratory responses, aquatic surface respiration (ASR), and the development of inferior lip swelling in tambaqui during prolonged (6 h) exposure to hypoxia. Intact fish (control) and three groups of denervated fish (bilateral denervation of cranial nerves IX+X (to the gills), of cranial nerves V+VII (to the orobranchial cavity) or of cranial nerves V alone), were exposed to severe hypoxia (Pw(O)2=10 mmHg) for 360 min. Respiratory frequency (fr) and heart rate (fh) were recorded simultaneously with ASR. Intact (control) fish increased fr, ventilation amplitude (V(AMP)) and developed hypoxic bradycardia in the first 60 min of hypoxia. The bradycardia, however, abated progressively and had returned to normoxic levels by the last hour of exposure to hypoxia. The changes in respiratory frequency and the hypoxic bradycardia were eliminated by denervation of cranial nerves IX and X but were not affected by denervation of cranial nerves V or V+VII. The V(AMP) was not abolished by the various denervation protocols. The fh in fish with denervation of cranial nerves V or V+VII, however, did not recover to control values as in intact fish. After 360 min of exposure to hypoxia only the intact and IX+X denervated fish performed ASR. Denervation of cranial nerve V abolished the ASR behavior. However, all (control and denervated (IX+X, V and V+VII) fish developed inferior lip swelling. These results indicate that ASR is triggered by O(2) chemoreceptors innervated by cranial nerve V but that other mechanisms, such as a direct effect of hypoxia on the lip tissue, trigger lip swelling. PMID:16621951

  17. 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. PMID:17299946

  18. Change in physical and chemical characteristics related to the binomial time-temperature used in sous pasteurization see Tambaqui (Colossoma macropomum

    Directory of Open Access Journals (Sweden)

    H.C.A. Kato

    2016-02-01

    Full Text Available The goal of this study was to evaluate sous vide fish and assess the influence of time and temperature on the pasteurization process through quality parameters. The raw material (tambaqui fillets and the sous vide underwent physical, physicochemical, and microbiological analyses. A sauce was prepared containing soy sauce, water, horseradish and garlic flakes. The product's pasteurization parameters of time and temperature were defined according to a 22 central composite rotatable design (CCRD, and the dependent variables were water holding capacity (WHC and instrumental texture aiming at obtaining high WHC values for the product to maintain the desired juiciness. The microbiological analysis required by legislation have indicated that the fish fillets and sous vide were within de standard. The values of total coliforms found in the samples (fillets and sous vide analyzed were below the critical level of 10² CFU/g. The counts of sulphite-reducing clostridia and psychrotrophic and mesophilic bacteria on plates in the samples were <1x10 CFU/g. In conclusion, temperature was the most important factor in the pasteurization process, significantly contributing to the quality of the final product. The mathematical models proposed were considered predictive for each response.

  19. CARACTERÍSTICAS HEMATOLÓGICAS DE JUVENIS DE TAMBAQUI (Colossoma macropomum Cuvier, 1818 ALIMENTADOS COM RAÇÕES CONTENDO FARINHA DE FOLHA DE LEUCENA (Leucaena leucocephala

    Directory of Open Access Journals (Sweden)

    Geraldo Pereira JUNIOR

    2015-12-01

    Full Text Available O objetivo deste trabalho foi avaliar as características hematológicas de juvenis de tambaqui alimentados com rações contendo farinha de folha de leucena. O estudo foi conduzido seguindo um delineamento experimental inteiramente casualizado com quatro tratamentos (0%, 8%, 16% e24% de inclusão de farinha de folha de leucena e três repetições. Foram distribuídos 250 juvenis de tambaqui com peso inicial médio de 41,1 g, em 12caixas plásticas redondas. Após 60 dias de cultivo, seis peixes por tratamento foram capturados e anestesiados para a coleta de sangue da veia caudal e determinação dos parâmetros hematológicos. Os resultados mostraram que a inclusão de farinha de folha de leucena nas rações alterou significativamente (p<0,05os parâmetros hematológicos (hematócrito, eritrócito, hemoglobina, volume corpuscular médio, concentração de hemoglobina corpuscular média e glicose plasmática dos peixes nos diferentes tratamentos. A conclusão desta pesquisa é que a inclusão de farinha de folha de leucena em rações para juvenis de tambaqui comprometeu as características hematológicas desta espécie.

  20. Control de malezas con cobertura vegetal en el cultivo de la Caraota negra (Phaseolus vulgaris L. Weed control with vegetal mulch in black beans (Phaseolus vulgaris L. crop.

    Directory of Open Access Journals (Sweden)

    Carlos Najul

    2006-08-01

    Full Text Available Con la finalidad de evaluar el nivel de control de malezas con el uso de coberturas vegetales en el cultivo de la caraota (Phaseolus vulgaris L. y determinar el efecto que sobre algunos componentes del rendimiento tienen estos métodos en comparación al control químico y manual, se condujo un ensayo bajo diseño de bloques al azar con ocho tratamientos y cuatro repeticiones. Los tratamientos de cobertura evaluados fueron: paja de Panicum maximum Jacq picada, entera, repicada y paja compostada, además de control químico (pendimetalin + linurón, dos tipos de control manual (desmalezado todo el ciclo y desmalezado a partir del inicio de la floración y un testigo siempre enmalezado. Se encontró que todos los métodos de cobertura alcanzaron más del 90% en el control de malezas a los 28 días después de la emergencia del cultivo, mientras que a 42 días sólo la paja picada mantuvo el nivel de control por encima del 90%. El mayor rendimiento del cultivo se obtuvo con el uso de la paja compostada con un valor de 2852,53 kg·ha-1, a pesar de que este tratamiento no produjo el mejor nivel de control de malezas, lo cual se atribuyó a los beneficios adicionales que habría producido la incorporación de este material orgánico al suelo. En el resto de los tratamientos de cobertura, así como en el control químico y desmalezado manual, se presentaron rendimientos similares entre sí y superiores al testigo.A trial was conducted to evaluate the effect of different kinds of weed control on the yield components of black beans (Phaseolus vulgaris L.. Eight treatments consisting in the use of soil mulches based on straw of Panicum maximum Jacq. besides chemical and manual methods of weed control were used as follows: chopped, whole, very finely chopped, and composted straw; a chemical control (pendimethalin+linuron, two types of manual control (weeding for the whole crop cycle, and weeding starting at flowering, and a control (always with weeds. A randomized block design with eight treatments and four repetitions was used. It was found that all soil mulch methods reached more than 90% weed control on the first evaluation (28 days after crop emergence, while in the second (42 days only in the chopped straw treatment the weeds were controlled more than 90%. The largest yield was obtained with the use of composted straw with a value of 2852.53 kg·ha-1, even though this treatment did not produce the highest weed control, which was attributed to the additional benefits probably obtained by the incorporation of this organic material to the soil. The rest of the mulch treatments, as well as chemical control and manual weeding showed similar results each other, but always greater than the control.

  1. Los depósitos de bentonita de Barda Negra y cerro Bandera, departamento Zapala, provincia del Neuquén, Argentina

    Directory of Open Access Journals (Sweden)

    A. Impiccini

    2002-09-01

    Full Text Available Las bentonitas de la región nordpatagónica pueden ser agrupadas en dos distritos mineralogenéticos caracterizados desde el punto de vista geológico, geográfico y estratigráfico. En este trabajo se considera a las bentonitas terciarias localizadas en la región occidental, en el departamento Zapala, provincia del Neuquén. Los depósitos consisten en estratos lenticulares, subhorizontales, de 2 a 15 metros de espesor, la mayoría de ellos aflorantes. Están incluidos en la Formación Collón Curá, una secuencia miocena continental donde alternan tobas y areniscas. Los cuerpos de arcilla son productos de alteración de materiales piroclásticos vítreos en ambientes húmedos confinados, tales como cuerpos de agua someros. Los análisis por difracción de rayos X muestran que prevalece una esmectita dioctaédrica - montmorillonita - como único mineral arcilloso en la mayoría de los depósitos. Los minerales accesorios son cuarzo, feldespato, plagioclasa y cristobalita (ópalo-CT, y en menor proporción, ceolitas y yeso. El Na+ es el ión intercambiable dominante, junto con Ca++, Mg++ y K+. El contenido en Fe2O3 es muy alto. Estas bentonitas son buenos agentes ligantes en arenas de moldeo para fundición, pero sus propiedades reológicas y el test de filtrado no cumplen exactamente con las normas API para lodos de perforación de petróleo.

  2. Lecturas críticas de los talleres de salud sexual y reproductiva y de fortalecimiento cultural desarrollados con mujeres negras desterradas por el conflicto armado en Colombia

    OpenAIRE

    Claudia Mosquera

    2007-01-01

    This article analyzes the speeches and social practices of government social practitioners - social workers and psychologists - who work in pro- grams that provide psychosocial care for displaced black women who come to Bogotá from the Pacific region as result of the country's internal armed conflict. The article focuses on the assumptions underlying two types of workshops that these programs offer: sexual and reproductive health, and cultural strengthening. It then shows how the speeches and...

  3. Lecturas críticas de los talleres de salud sexual y reproductiva y de fortalecimiento cultural desarrollados con mujeres negras desterradas por el conflicto armado en Colombia

    Directory of Open Access Journals (Sweden)

    Claudia Mosquera

    2007-08-01

    Full Text Available This article analyzes the speeches and social practices of government social practitioners - social workers and psychologists - who work in pro- grams that provide psychosocial care for displaced black women who come to Bogotá from the Pacific region as result of the country's internal armed conflict. The article focuses on the assumptions underlying two types of workshops that these programs offer: sexual and reproductive health, and cultural strengthening. It then shows how the speeches and practices used in these workshops illustrate two contradictory ways of valuing the black ethnic-racial presence in the country. Instead of being spaces of equity and justice, these workshops reproduce images and social representations of this "otherness" and create social distances that promote asymmetries in ethnic-racial relations with black people.

  4. Raza, género y espacio: las mujeres negras y mulatas negocian su lugar en la Habana durante la década de 1830

    Directory of Open Access Journals (Sweden)

    Luz M. Mena

    2007-04-01

    Full Text Available Black and mulatto women "negotiated" their place in Havana's society in the 1830s and 40s.Theynegotiated their insertion in every space of the city, from the most public ones, like the spaces of the law, to the most intimate ones, like those forged through their own sexuality. To a great extent, these negotiations were framed within their decisive role as mediating agents between blacks and whites: as wives, lovers, teachers, wet nurses, caretakers and servants, but also as property owners, entrepreneurs and pursuers of their own legal causes. They negotiated their social and economic inclusion by means of their daily activities, often atthe margins of urban regulations and social traditions. These practices engaged in a continuous and tense "dialog" with the discourses of the Creole and Peninsular modernizing elites. These reformers, who considered these women's growing participation in the daily life of the city one of the most worrisome and disorderly elements in the city, developed strong discourses of social order and urban reforms to discipline the growing city. Many of these discourses were oriented to establish clearer and more rationalized social and racial boundaries that would try to contain, if not the activities of these women, at least their influence on the population. It was within this dialog, never equal and often violent, that the modern geography of Havana was drawn.

  5. Rap como identidade cultural negra e periférica: a aversão de rappers brasileiros a Rede Globo

    OpenAIRE

    Júnior, Francisco Carlos Guerra de Mendonça

    2014-01-01

    O rap (rhythm and poetry – ritmo e poesia) é a vertente musical do movimento hip hop, que surgiu nos Estados Unidos na década de 1960. Além do rap, o hip hop conta com MC´s (Mestres de Cerimônia), os DJ´s (disc-joqueys), a dança (break dance) e a pintura (grafith). O rap passou a ser um método utilizado para conscientizar a população sobre os problemas vivenciados pelos negros e periféricos. O hip hop chegou ao Brasil nos anos de 1980 e manteve a essência da luta contra o racismo. Dominada em...

  6. A imagem negra emoldurada na escola: sob o discurso da igualdade/ Framed black image in school: under the discourse of equality

    OpenAIRE

    Wilma de Nazaré Baía Coelho; Rosângela Maria de Nazaré Barbosa e Silva

    2010-01-01

    O estudo tem como temática as Representações e Relações Raciais. Analisa as representações de professores sobre as relações raciais no currículo da rede estadual de Ensino Médio. Esta pesquisa fundamentou-se no referencial teórico-metodológico emChartier (1991) e Bourdieu (1990), Gomes (2002), Coelho (2006), Silva(1997), Canen(2001), Moreira (2006) para a análise das representações, com os primeiros e, com os demais, que vêm trazendo importantes contribuições na formação de professores quanto...

  7. Desolació i pèrdua d'identitat : anàlisi de Pluja Negra i Flors d'Estiu

    OpenAIRE

    Vaquero Pujagut, Cristina

    2012-01-01

    La bomba atòmica "representa la perfección del hombre por su parte 'malvada'. Ya no podemos ser más malvados, inteligentes y defensivos" (Sloterdijk, P.; 2003. p. 218 ). Aquesta és la reflexió de Peter Sloterdijk sobre la humanitat que ha provocat aquesta barbàrie, sent conscient que aquesta no pot ser més maligna ni provocar més dolor, després de destruir conscientment una ciutat sencera junt amb els seus habitants innocents. Però com es van sentir els hibakusha, supervivents de l'atac nucle...

  8. ELEMENTOS MINERAIS EM MADEIRAS DE EUCALIPTOS E ACÁCIA NEGRA E SUA INFLUÊNCIA NA INDÚSTRIA DE CELULOSE KRAFT BRANQUEADA

    Directory of Open Access Journals (Sweden)

    Maria C. M. Silva

    1999-06-01

    Full Text Available No ramo de papel e celulose os efluentes são um dos principais problemas e o consumo de água é crítico. Os circuitos internos estão sendo fechados e as fontes de contaminação precisam ser conhecidas. Uma das fontes de contaminação destes efluentes são os minerais da madeira, matéria-prima neste tipo de indústria. Neste trabalho foi avaliada a quantidade de alumínio, cálcio, cobre, ferro, potássio, magnésio, manganês, sódio, níquel e silício em madeiras de cinco espécies florestais, plantadas na região de Guaíba, RS, compreendendo Acacia mearnsii, Eucalyptus dunnii, Eucalyptus globulus, Eucalyptus grandis, Eucalyptus saligna. As amostras de madeira foram tratadas com digestão ácida e com carbonização em mufla, solubilizando em ácido para serem analisadas por ICP (Inductively Coupled Plasm. Foi observado que a quantidade de elementos é considerável e os principais elementos encontrados foram K, Ca, Na, Al, Mn, e Si. As espécies Eucalyptus grandis e Eucalyptus saligna mostraram melhor crescimento. Por outro lado, Eucalyptus globulus e Eucalyptus dunnii mostraram menor crescimento e maior teor de elementos. Pelo fato dessas espécies introduzirem maiores quantidades de elementos no processo de fabricação, devem conduzir a maiores problemas industriais. A Acacia mearnsii mostrou o menor nível para ferro, manganês e níquel, sendo uma boa opção para uso em branqueamento com oxigênio, ozônio e peróxido. O silício observado estava em baixa quantidade, o que leva a afirmar que há, na prática industrial, muita contaminação da madeira explorada com solo já que se encontram altos valores de sílica nos circuitos de licores. A entrada dos elementos minerais estudados em uma fábrica de celulose via madeira varia de 4 a 6 kg por tonelada de polpa não-branqueada produzida. Cuidados especiais devem ser tomados com as espécies com madeiras mais ricas em cinzas e elementos minerais e mais baixas eficiências nutricionais, como foi o caso de Eucalyptus dunnii e Eucalyptus globulus.

  9. A climatic potentiality model for black truffle (Tuber melanosporum) in Teruel (Spain); Un modelo de potencialidad climatica para la trufa negra (Tuber melanosporum) en Teruel (Espana)

    Energy Technology Data Exchange (ETDEWEB)

    Alonso Ponce, R.; Agueda, B.; Agreda, T.; Modrego, M. P.; Aldea, J.; Martinez-Pena

    2010-07-01

    Black truffle (Tuber melanosporum) is an edible ectomycorrhizal mushroom whose cultivation is an economicallyviable alternative in rural areas affected by depopulation. In the province of Teruel (Spain), truffle plantations occupy nowadays more than 4,500 ha, but no land use planning guidelines have been available. Species distribution models are tools that allow managers, farmers and foresters to plan ahead and make decisions with a scientific basis. The territory climatically suitable for T. melanosporum in Teruel has been predicted using a method based on the ecology field theory, previously tested in the development of distribution models for forest species. A dataset of 924 locations where black truffle has been collected in the Catalano-Aragonesa ecoregion and eight climatic parameters deeply influencing the presence and fructification of the black truffle have been considered and their corresponding habitats have been built. The distribution model, corrected under lithological criteria, has identified more than 8,000 km2 as suitable for black truffle fructification in Teruel, almost 55% of the province, belonging 3,000 of them to the optimal class. This land is mainly distributed over the regions of Gudar-Javalambre, Comunidad de Teruel and Maestrazgo. A further correction based on land-use criteria has identified more than 4,000 km{sup 2} as suitable for truffle plantations, being 1,150 of them optimal. The model here presented will help to a proper planning for truffle cultivation in the province of Teruel. (Author) 67 refs.

  10. Uma cristologia libertadora negra no Brasil colônia e a mesa como espaço da partilha e da libertação

    Directory of Open Access Journals (Sweden)

    Ana Pinheiro dos Santos

    2009-05-01

    Full Text Available Este artigo tem como objetivo iniciar de uma reflexão provocativa, que conduza ao diálogo sobre a história do trabalho escravo do negro no Brasil e a cristologia desse povo considerando seus anseios, sonhos e luta pela libertação do sistema que os oprimiam em todas as suas dimensões. Além de trazer a Bíblia como legitimação da liberdade, sendo que esta liberdade pode ser caracterizada a partir da mesa como um espaço de partilha independente de cor, raça e condição social.

  11. Iranian supplier HEPCO receives CMS Gold Award: Ali Mohammad Rafiee (left) from HEPCO receives the CMS Gold Award from CMS spokesman Michel Della Negra.

    CERN Multimedia

    Patrice Loïezi

    2004-01-01

    As part of the fifth annual CMS awards, Iranian contractor HEPCO has received a Gold Award, for top suppliers, in a ceremony held on 14 June. HEPCO received the award for the excellent quality of work in constructing two 20 tonne support tables, two 75 tonne shields and supporting brackets to lower the Hadron Forward Calorimeter into the CMS detector cavern, to tolerances that were very difficult in structures of this size.

  12. La educación colonial en África negra española durante el franquismo (1939-1949

    Directory of Open Access Journals (Sweden)

    Olegario NEGRÍN FAJARDO

    2010-03-01

    Full Text Available RESUMEN: Cuando se habla o se escribe de la España de Franco y, más en concreto, de la educación durante el franquismo, se suele omitir cualquier alusión a los territorios coloniales españoles en África. ¿Cuál puede ser la razón de tal carencia?: ¿olvido?, ¿desinterés?, ¿desinformación? Sea cual sea la razón o razones que pudieran explicar tal hecho, lo que parece claro es que se ha investigado poco y se ha publicado mucho menos en las últimas décadas sobre la educación en el Sahara español, en el protectorado marroquí y en la Guinea española, aunque no faltan las alusiones al tema en obras de interés general.

  13. Efecto del secado parcial de raíces en la vid "Tempranillo" cultivada franca de pie o injertada sobre el portainjerto Criolla Negra en campo o contenedor

    OpenAIRE

    Piña Lobo, Sonia Josefina

    2016-01-01

    El secado parcial de raíces (PRD) es una técnica irrigación con un ahorro potencial del agua de riego en los viñedos. El objetivo general de este estudio fue estudiar los efectos que provoca la estrategia de riego PRD sobre aspectos de la fisiología, anatomía, crecimiento vegetativo, reproductivo y de calidad en el cv. Tempranillo, en condiciones de vivero o campo, en la localidad de El Tocuyo (9º 48’ N; 610 msnm), estado Lara, Venezuela. En el primer ensayo se evaluó el efecto de cinco nive...

  14. Natural quartz TL property and similarity in Piper nigrum L; Propiedad TL de cuarzo natural y similitud en pimienta negra (Piper nigrum L.)

    Energy Technology Data Exchange (ETDEWEB)

    Guzman A, S.; Cruz Z, E.; Furetta, C. [Unidad de Irradiacion y Seguridad Radiologica, Instituto de Ciencias Nucleares, UNAM, Circuito Exterior, Ciudad Universitaria, 04510 Mexico D. F. (Mexico); Brown, F. [Departamento de Investigacion en Polimeros y Materiales, Universidad de Sonora, Apdo. Postal 130, 83000 Hermosillo, Sonora (Mexico); Barboza F, M. [Centro de Investigacion en Fisica, Universidad de Sonora, Apdo. Postal 5-088, 83190 Hermosillo, Sonora (Mexico)], e-mail: ecruz@nucleares.unam.mx

    2009-10-15

    Quartz is a mineral abundant in nature and can provide information thermoluminescent (TL), and also is located in the mineral fraction of some herbs and spices consumed. It is present the analysis of the TL properties of a sample of natural quartz rock and compared with those obtained from the fraction of Piper nigrum L. poly mineral when they were exposed to {sup 60}Co gamma radiation. The poly minerals of Piper nigrum L. were analyzed by X-ray diffraction, where the quartz was found as a major component. They separated in different particle sizes (10, 53, 74 and 149 {mu}m). The samples were irradiated at relatively low doses (1-500 Gy) and high (0.1-40 kGy) in order to determine the linearity of the TL emission as a function of the dose and the analysis of glow curves. Also there was the fading of the TL signal, the effect of ultra violet light. The reproducibility of the TL signal in the samples indicates that a smaller particle size gives better TL signal. (author)

  15. Proyecto para la forestación de 11,54 Ha. con encina micorrizada con trufa negra en Tozalmoro (Soria)

    OpenAIRE

    Labanda Sánchez, Sergio

    2013-01-01

    Se diferencian dos partes: Puesta en plantación con encinas micorrizadas para la producción de tuber melanosporum y vallado y la implantación de riego por microaspersión fija o cobertura total localizada

  16. Primera datación radiocarbónica del sitio puerto 14 de mayo (Bahía Negra, Alto Paraguay)

    OpenAIRE

    Guillermo N. Lamenza; Calandra, Horacio; Salceda, Susana Alicia

    2015-01-01

    Las investigaciones Antropológicas en curso en la región del Gran Chaco argentino requirieron incrementar la información sobre la periferia regional. En este marco, a partir del año 2013, se iniciaron tareas que tienen como objetivo profundizar el conocimiento sobre el pasado prehispánico de Paraguay. Así, se puso en ejecución un subproyecto que incluye, como primera etapa, el análisis de colecciones arqueológicas a resguardo en diferentes museos de dicho país (C. Pusineri, M. Schmidt, B. Sus...

  17. 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.

  18. Frutos e sementes consumidos pelo tambaqui, Colossoma macrompum (Cuvier, 1818 incorporados em rações: digestibilidade e velocidade de trânsito pelo trato gastrointestinal Fruits and seeds consumed by tambaqui (Colossoma macropomum, CUVIER, 1818 incorporated in the diets: gastrointestinal tract digestibility and transit velocity

    Directory of Open Access Journals (Sweden)

    Jorge Antonio Moreira da Silva

    2003-12-01

    Full Text Available O objetivo do presente trabalho foi estudar o efeito da incorporação de duas espécies de frutos e de duas espécies de sementes em uma dieta referência sobre a digestibilidade dos nutrientes e a velocidade de trânsito do alimento pelo trato gastrointestinal do tambaqui. Utilizando-se uma dieta de referência, 55% do fubá de milho foi substituído, em igual proporção, por farinhas elaboradas a partir do frutos jauari (Astrocaryum jauari e embaúba (Cecropia sp. e das sementes de munguba (Pseudobombax munguba e seringa barriguda (Hevea spruceana. Foram utilizados 15 tanques redondos de cimento amianto de 250 L, com circulação contínua de água e aeração permanente. Sessenta peixes de 1627±112,8 g de peso médio foram distribuídos nas unidades experimentais em grupos de quatro peixes. O delineamento experimental foi o inteiramente casualizado, com cinco tratamentos e três repetições. Os peixes receberam, durante o período experimental, duas refeições diárias, 9 e 16 h, até a saciedade. O tempo de trânsito foi calculado tomando-se o tempo de início da ingestão da dieta (T0 e o tempo do início do aparecimento das primeiras fezes com coloração verde (Tfinal, devido à presença de óxido de cromo (Cr2O3 incluído na ração como indicador inerte. Os peixes foram sacrificados por choque térmico a 4ºC. As amostras foram coletadas no estômago e em três partes do intestino. A incorporação de frutos e sementes alterou significativamente os teores dos nutrientes e os coeficientes de digestibilidade de todas as dietas experimentais. A composição das dietas influenciou significativamente o tempo de trânsito do alimento pelo trato gastrointestinal.A feeding trial was carried out to evaluate nutrient gastrointestinal digestibility and transit velocity in tambaqui fed two species of fruits and two species of seeds incorporated in a reference diet. In the reference diet, 55% of the yellow corn grain was replaced, in equal proportions, by grounded meal prepared from the jauari (Astrocaryum jauari and embaúba (Cecropia sp. fruits, and from munguba (Pseudobombax munguba and seringa barriguda (Hevea spruceana seeds. Fifteen 250-L fiber cement tanks, with continuous water flow and aeration, were stocked with a total of sixty fish with 1627±112.8 g average weight, and four fish in each unit. A completely randomized design, with five treatments and three replicates, was used. During the experimental feeding, the fishes were hand-fed to visual satiety twice daily, at 9 a.m. and 4 p.m. Feed transit time was calculated by the difference between time of the fish ingestion of diet (T0 and time (Tfinal of the first appearance of the green colored feces, due to the presence of chromic oxide (Cr2O3 added to the diet as an inert indicator. Fish were sacrificed by a thermal shock at 4ºC. The samples were collected from the stomach and in three distinct parts from the intestine. Fruits and seeds inclusion in the diet significantly altered the nutrient composition and the digestibility coefficient of all experimental diets. Diet composition showed significant effect on the feed gastrointestinal transit time.

  19. Influence of the weight of juveniles Matrinxã (“Brycon cephalus”) and Tambaqui (“Colossoma macropomum”) to the anesthetic action of the eugenol Influência do peso de juvenis de matrinxã ("Brycon cephalus") e tambaqui ("Colossoma macropomum") à ação anestésica do eugenol

    OpenAIRE

    Elitieri Batista dos Santos Neto; Ricardo Castelo Branco Albinati; Luiz Vítor Oliveira Vidal; Boaventura Tadeu de Deus; Ana Catarina Luscher Albinati

    2007-01-01

    It was evaluated the influence of the weight in the effect of the anesthetic eugenol for juveniles of matrinxã and tambaqui. For that, it was used a total of 69 matrinxãs and 49 tambaquis. The animals were anesthetized individually, weighed and observed during the induction and the recover of the anesthesia. For the induction it was used the concentration of the anesthetic's 50 mg/L, previously diluted in alcohol. The obtained weights were gathered in five classes and no difference statistics...

  20. 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)

    OpenAIRE

    Danieli Cuzini Lombardi; Levy de Carvalho Gomes

    2008-01-01

    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 condiçõ...

  1. Composição corporal de tambaqui, Colossoma macropomum, e matrinxã, Brycon cephalus, em sistemas de cultivo intensivo, em igarapé, e semi-intensivo, em viveiros

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    Arbeláez-Rojas Gustavo Alberto

    2002-01-01

    Full Text Available Foi conduzido um estudo para avaliar o efeito do sistema de cultivo na composição corporal de juvenis de tambaqui e matrinxã, quando cultivados em sistema intensivo, em canal de igarapé, e em sistema semi-intensivo, em viveiros. Foram usados juvenis de tambaqui e matrinxã com comprimento e peso médio inicial de 15,4 cm e 88,3 g e 23,4 cm e 219,4 g, respectivamente. Os juvenis de cada espécie foram estocados a uma densidade de 10 e 1 peixe/m³ no sistema intensivo e semi-intensivo, respectivamente. O período experimental foi de 170 dias e os peixes foram alimentados duas vezes ao dia, até aparente saciedade, com ração extrusada comercial contendo 30% de proteína bruta. A análise da composição corporal de peixe inteiro e filé de tambaqui e matrinxã demostrou que houve menor deposição de gordura e maior retenção de proteína nos peixes cultivados no sistema intensivo, em canal de igarapé, do que naqueles cultivados no sistema semi-intensivo, em viveiros. O desempenho das espécies foi diferenciado dependendo do sistema de cultivo: o tambaqui apresentou diferenças significativas no ganho em peso, sendo este 3,0 vezes maior no sistema semi-intensivo, enquanto o matrinxã não apresentou diferenças significativas no ganho em peso nos dois sistemas de cultivo.

  2. 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.

  3. Determinação da digestibilidade da matéria seca e da proteína bruta do fubá de milho e do farelo de soja para tambaqui (Colossoma macropomum, utilizando-se técnicas com uso de indicadores internos e externos Determination of the digestibility of tambaqui (Colossoma macropomum food nutrients by the techniques with internal and external indicators

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    Manuel Vazquez Vidal Jr.

    2004-12-01

    Full Text Available Foram realizados dois experimentos com o objetivo de comparar técnicas de digestibilidade de nutrientes de alimentos para peixes, com o uso dos indicadores externos (óxido crômico e carbonato de bário e internos (cinza insolúvel em ácido, cinza insolúvel em detergente ácido, fibra bruta e fibra detergente ácido e com a técnica de determinação direta. Tambaquis com 100 g receberam, no primeiro experimento, fubá de milho e, no segundo, farelo de soja. O óxido crômico e o carbonato de bário são indicadores externos efetivos para estimar os coeficientes de digestibilidade dos alimentos para tambaquis. A fibra bruta e a fibra detergente ácido apresentaram baixa recuperação e não estimaram de forma consistente os coeficientes de digestibilidade dos alimentos para tambaquis, subestimando-os. A cinza insolúvel em ácido e a cinza insolúvel em detergente ácido apresentaram alta porcentagem de recuperação e estimaram de forma consistente os coeficientes de digestibilidade dos alimentos para tambaquis, quando presentes no alimento em teores acima de 3,8% e 3,1%, respectivamente. A técnica de determinação direta foi eficiente para estimar os coeficientes de digestibilidade dos alimentos para tambaquis.Two experiments were carried out aiming to compare techniques of digestibility of fish food nutrients, by using external indicators (chromic oxide and barium carbonate, internal indicators (HCl-insoluble ash, acid detergent insoluble ash, crude fiber and acid detergent fiber and the direct determination technique. Corn meal was used in the first experiment and soybean meal was used in the second one; both used 100 g tambaquis. Chromic oxide and barium carbonate are effective external indicators for estimating the digestibility coefficients of feedstuffs fed to tambaquis. Crude fiber and the acid detergent fiber present a low recovery and do not estimate accurately the digestibility coefficients of feedstuffs for tambaquis and also underestimate them. The insoluble ash in acid and the insoluble ash in detergent acid showed high recovery percentage and accurately estimated the digestibility coefficients of feedstuffs fed to tambaquis, when showed contents higher than 3.8 and 3.1, respectively. The direct determination technique was efficient to estimate the digestibility coefficients of the food given to the tambaquis.

  4. 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

    OpenAIRE

    Levy de Carvalho Gomes; Danieli Cuzini Lombardi

    2009-01-01

    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 condiçõ...

  5. Interseccionalidade de gênero, classe e raça e vulnerabilidade de adolescentes negras às DST/aids Intersectionality of gender, class and race, and vulnerability of black female adolescents to STD/AIDS

    OpenAIRE

    Stella R. Taquette

    2010-01-01

    OBJETIVO: verificar a vulnerabilidade ao HIV/aids de adolescentes femininas moradoras de favelas da cidade do Rio de Janeiro. MÉTODO: foi utilizada uma combinação de métodos, quantitativo e qualitativo. Na etapa quantitativa, realizou-se um estudo observacional de corte transversal por meio de entrevistas e exames clínico/laboratoriais para diagnóstico de DST, e, na qualitativa, desenvolveram-se grupos focais sobre os temas sexualidade, gênero e raça. RESULTADOS: foram entrevistadas 816 adole...

  6. Ações afirmativas no sistema educacional: trajetórias de jovens negras da universidade de Brasília Afirmative action in the educational system: trajectories of young black women at the university of Brasília

    OpenAIRE

    Wivian Weller; Marly Silveira

    2008-01-01

    O presente artigo apresenta experiências vividas por jovens universitárias que ingressaram pelo sistema de cotas na Universidade de Brasília nos cursos de Engenharia e Ciências Sociais e que apresentam distintas trajetórias de socialização escolar. Analisa as experiências vividas nesses espaços assim como as estratégias diferenciadas no que diz respeito ao enfrentamento do preconceito e da discriminação. Apresenta ainda as avaliações realizadas pelas jovens a respeito da implementação de cota...

  7. Ações afirmativas no sistema educacional: trajetórias de jovens negras da universidade de Brasília Afirmative action in the educational system: trajectories of young black women at the university of Brasília

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    Wivian Weller

    2008-12-01

    Full Text Available O presente artigo apresenta experiências vividas por jovens universitárias que ingressaram pelo sistema de cotas na Universidade de Brasília nos cursos de Engenharia e Ciências Sociais e que apresentam distintas trajetórias de socialização escolar. Analisa as experiências vividas nesses espaços assim como as estratégias diferenciadas no que diz respeito ao enfrentamento do preconceito e da discriminação. Apresenta ainda as avaliações realizadas pelas jovens a respeito da implementação de cotas para estudantes negros nas universidades públicas. Concordamos que não adianta a medida ser justa e estar de acordo com os imperativos da justiça social se ela não produz resultados. As cotas não representam a única forma de luta por reconhecimento e redistribuição, mas refletem a importância e a necessidade de uma modificação mais profunda na gramática dos discursos no interior da universidade e no atendimento das demandas políticas e sociais.This article presents the experiences of black female students admitted by the University of Brasília through the affirmative action programme. They attend courses in Engineering and Social Sciences and have experienced different school socialization processes. By choosing students of different academic courses and school backgrounds we tried to analyse their experiences with racism and prejudice and also the strategies to overcome these situations. A second focus of our analyses lies on the experiences of black female students and their attitude toward affirmative action in public universities of Brazil. We agreed that it is not sufficient to say that this policies are fair because they are in accordance to the imperative of social justice, if the results are not evident. The establishment of systems of quotas is not the only way of recognition and redistribution, but it reflects the necessity of an adjustment of the university system to the political and social requirements of the Brazilian society and its people.

  8. Posición editorial en la prensa de EEUU y España sobre las mareas negras provocadas por el hombre: I Guerra de Irak (1991), Prestige (2002) y Golfo de México (2010)

    OpenAIRE

    Martín Molina, Víctor Manuel

    2015-01-01

    Análisis del tratamiento editorial sobre tres vertidos mediáticos provocados en contextos distintos: la Guerra del Golfo o I Guerra de Irak, el naufragio del Prestige y el vertido del Golfo de México, comparando el discurso en Estados Unidos y en España. La investigación se enmarca dentro del periodismo ambiental y, mediante la combinación del análisis de contenido y el 'framing', pretende definir cuáles son las prioridades de los medios de comunicación en el tratamiento editorial de un verti...

  9. Efectividad biológica de TCMTB para el control de la Costra Negra Rhizoctonia solani Kühn de la papa Solanum Tuberosum L., en la región de León, Guanajuato, México

    OpenAIRE

    Luis Pérez Moreno; José Orlando Castillo; Fernando Javier Cantú

    2001-01-01

    En la región de León, Guanajuato, México durante el ciclo verano-otoño 1998, se evaluó el fungicida 2-(Thiocyanomethylthio) benzothiazole (TCMTB) en dosis de 6, 8 y 10 litros por hectárea para el control del hongo del suelo Rhizoctonia solani Kühn. Se usó un diseño de bloques al azar, con cuatro repeticiones. Se evaluó el número de tallos emergidos, el efecto fitotóxico, los porcentajes de brotes y tallos dañados por R. solani, el rendimiento y calidad del tubérculo; finalmente, el porcentaje...

  10. EVALUACIÓN DE RESISTENCIA DE GENOTIPOS DE PLÁTANO Y BANANO A LA SIGATOKA NEGRA (MYCOSPHAERELLA FIJIENSIS MORELET. EVALUATION OF RESISTANCE OF PLANTAIN AND BANANA GENOTYPES TO BLACK SIGATOKA (MYSCOSPHAERELLA FIJIENSIS MORELET.

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    Alejandra Cuéllar Quintero

    2011-06-01

    Full Text Available Con el objetivo de evaluar bajo condiciones de invernadero genotipos de plátano y banano frente a poblaciones de Mycosphaerella fijiensis Morelet de diferente virulencia y origen, se estableció una colección de 125 aislamientos monospóricos obtenidos en 10 departamentos de Colombia. Se seleccionaron 50 aislamientos por área geográfica y genotipo hospedante, para la caracterización morfológica y patogénica del hongo en Dominico Hartón. En las pruebas de patogenicidad y resistencia se realizaron inoculaciones de una suspensión acuosa de 5.000 conidias mL-1, la respuesta de las plántulas a la enfermedad se determinó mediante las variables periodo de incubación (PI, tiempo de evolución de los síntomas (TES, área bajo la curva del desarrollo de la enfermedad (ABCDE y tasa de desarrollo de la enfermedad (r. La inoculación de los 50 aislamientos en plántulas de Dominico Hartón, permitió establecer cinco niveles de virulencia (muy alta, alta, media, baja y muy baja. La virulencia de los aislamientos no se relacionó con su origen geográfico ni con el genotipo del cual se obtuvieron; encontrándose en una misma zona y en un mismo genotipo, aislamientos de diferente virulencia. Los genotipos de plátano y banano mostraron un comportamiento diferencial frente a cinco aislamientos de diferente virulencia y origen, resultados que permitieron establecer tres niveles de reacción de los genotipos frente a los aislamientos (resistente, intermedio y susceptible, destacándose los genotipos Topocho, Maqueño, FHIA 20, FHIA 21 de plátano y los genotipos Sedita y FHIA 23 de banano por presentar un mayor nivel de resistencia, expresada como un progreso lento y menos severo de la enfermedad.A study was conducted to evaluate plantain and banana genotypes with Mycosphaerella fijiensis Morelet isolates of different virulence and geographic origin. The pathogenicity test and morphological characterization of the M. fijiensis populations were performed with a group of fifty monosporic isolates representative of the geographic growing areas in Colombia. For the pathogenicity and resistance assays an aqueous spore suspension of 5.000 conidias mL-1 was used to inoculate seedlings of plantain and banana genotypes, disease response of genotypes was rated by measuring the variables incubation period (IP, time of evolution of symptoms (TES, area under disease progress curve (AUDPC and rate of disease development (r.The inoculation of fifty isolates on Dominico Harton cultivar allowed to establish five levels of virulence (very high, high, medium, low and very low, which were not related to their geographic origin nor to genotype of the isolates. Isolates with different virulence level were present in the same zone and in the same genotype. The resistance assay showed that plantain and banana genotypes can present a differential behavior to the M. fijiensis isolates. The disease severity measured in the genotypes allowed to classify the in three disease reactions levels, resistance, intermediate and susceptible genotypes The plantain genotypes Topocho, Maqueno, FHIA 20 and FHIA 21, and the banana genotype Sedita and FHIA 23 were characterized for having a higher level of resistance, that was expressed as a lower disease severity and slower disease progress as compared with the other genotypes.

  11. Influência de Fatores Abióticos na Infestação de Mosca-Negra-dos-Citros (Aleurocanthus woglumi Ashby em Plantio de Citros em Sistema Agroflorestal no Estado do Pará

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    Anderson Silva

    2011-03-01

    Abstract. An important part of citrus production at Pará state is planted by Agroforestry System (AFS, that presents, amongst major phytosanitary problems, the citrus blackfly, that by severe attacks cause estimated redution of 80% in its’ production. Beside that, it constitutes a quarentenary pest of maximun alert level A2. Given the relevance of this sucking insect and the lack of basic knowledge, as well pest studies associated to agroforestry planting, the objective of this study was to evaluate the abiotic factors influence on blackfly infestation in citrus planting by agroforestry planting at Pará state. This study was carried out at Capitão Poço county, northeast mesoregion of Pará. 12 samplings were made evaluating the presence or abscence of Aleurocanthus woglumi Ashby alive nymphs and/or adults. Correlation analisys was carried out to evaluate abiotic parameters (temperature and precipitation and kriging maps to evaluate Teca plants shading effects on the pest under study infestation. Amongst the main results obtained, there was pest infestation in every evaluated moth; there was temperature influence onto citrus blackfly population regulation and high precipitations reduced the number of plants with A. woglumi presence. Still, it can be inferred that the citrus blackfly infestations present preference for moderate shading intensity. However, changes occuring by the forestry species introduction onto agricultural cultivations must be better investigated.

  12. Matrimonios mixtos y cnice de la barrera de color como vías para el mestizaje de la población negra y mulata (1674-1796

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    Norma Angélica Castillo Palma

    2000-01-01

    Full Text Available El artículo tiene dos hipótesis principales. En primer lugar, hace evidente la amplitud de la preferencia hacia los matrimonios mixtos entre la población de origen africano en Cholula durante el periodo 1674-1796. En segundo término se pretende mostrar que la descendencia de dichas parejas mixtas tenía una amplia gama de posibilidades de adscripción en una o varias categorías socio-raciales. Esta situación le permitia al individuo buscar aquéllas designaciones más ventajosas, como el ser considerado mestizo o ser incluido en el gmpo indígena. Las variaciones en los patrones matrimoniales de los esclavos y sus descendientes se han seguido de maneracuantitativa, mientras que el salto de la barrerade color se ha analizado a partir de la reconstrucción de genealogías. El wmportamiento de ambos indicadores nos permite concluir que la población de origen africano buscó diluirse con otros grupos para asimilarse jurídicamente con los mestizos, los indios y excep cionalmente alcanzar una movilidad que les permitiera ser considerados como españoles. Por esta razón, entre la población de origen africano encontramos un frecuente cambio de identidad socio-racial. Estas particularidades fueron posibles gnicias al contexto multiétnico de inserción de los esclavos africanos, puesto que la unidades productivas cholultecas, haciendas y obrajes, contaban con una dominante población indigena trabajadora, una élite española y un creciente grupo mestizo.

  13. Biology of the citrus blackfly, Aleurocanthus woglumi Ashby (Hemiptera: Aleyrodidae), in three host plants; Biologia da mosca-negra-dos-citros, Aleurocanthus woglumi Ashby (Hemiptera: Aleyrodidae), em tres plantas hospedeiras

    Energy Technology Data Exchange (ETDEWEB)

    Pena, Marcia R.; Silva, Neliton M. da [Universidade Federal do Amazonas (UFAM), Manaus, AM (Brazil).Lab. de Entomologia Agricola], e-mail: marciarpena@yahoo.com.br, e-mail: nmarques@ufam.edu.br; Venframim, Jose D.; Haddad, Marineia de L. [Escola Superior de Agricultura Luiz de Queiroz (ESALQ/USP), Piracicaba, SP (Brazil). Lab. de Resistencia de Plantas e Plantas Inseticidas], e-mail: jdvendra@esalq.usp.br, e-mail: mlhaddad@esalq.usp.br; Lourencao, Andre L. [Instituto Agronomico de Campinas (IAC), SP (Brazil)], e-mail: andre@iac.sp.gov.br

    2009-03-15

    The citrus blackfly, Aleurocanthus woglumi Ashby, was detected in Brazil in 2001. The aim of this research was to evaluate the biology, biometry and host preference of A. woglumi in sweet orange, acid lime Tahiti and mango. Experiments were set in laboratory conditions with insects collected in rangpur lime plants in Manaus, State of Amazonas, from January to June of 2006. The following parameters were evaluated: number of spirals (ovo positions) and eggs per plant, number of eggs by spiral per plant, survival of the immature (eggs, 1st, 2nd, 3rd and 4th instars), and length and survival of the immature stage. The mean embrionary period was 15 days for the three hosts. The 4th nymph (puparium) was the longest during nymph development. Second and third instars had the highest survival. The mean length of the egg-adult cycle was 70 days for the three hosts evaluated. The eggs were laid in a spiral shape on the adaxial leaf surface. The 1st instars moved to short distances from the spiral, while the 2nd, 3rd and 4th are sessile and have bristles on the whole body. Based on the highest oviposition and the highest survival of the immature stage of the citrus blackfly in acid lime Tahiti, this plant can be considered the most suitable host to A. woglumi. (author)

  14. Características del proceso fermentativo durante la conservación de aceitunas de la variedad Hojiblanca, destinadas a la elaboración del tipo negras

    Directory of Open Access Journals (Sweden)

    Fernández González, J.

    1992-08-01

    Full Text Available The paper studies the changes of the physico-chemical and microbiological characteristics of the fermentation in aerobic conditions that occur during the storage stage of Hojiblanca cultivar used to elaborate ripe olives. Assayed treatments include all the conditions used at industrial level (correction of initial pH to 4,0-4,2 units with acetic acid, sodium chloride concentration ranging between 3 and 6%, green to yellow-pink green fruits and bubling of air at a rate of 0,3 liter per hour and liter of the vessel capacity. The process was characterized by a maintenance of the pH values, a slow sugar consumption, very low content of carbon dioxide and progressive increase of the salt concentration. Gram-negative rods and Bacillus grew at the beginning of the process; however, the most representative germs of these fermentation were the yeasts, whose population grew rapidly from brining (at higher rate as the salt content was slower. They remained throughout the storage, although after 180 days a decrease tendency was observed. The most representative species were: Pichía membranae faciens (51% of frequency, Pichía fementans (6% and Hansenula polymorpha (6%. No gas-pocket or shrivelling was appreciated in any treatment.

    El trabajo estudia la evolución de las características físico-químicas y microbiológicas de la fermentación en medio aeróbico durante la conservación de aceitunas de la variedad Hojiblanca, en las diversas condiciones de los actuales procesos industriales (pH corregido inicialmente con acético a 4,0-4,2 unidades, concentración de sal entre 3 y 6%, frutos verdes o con una mayor madurez y aireación a razón de 0,3 litros de aire por hora y litro de capacidad del recipiente. La misma se caracteriza por un mantenimiento del pH, lenta utilización de los azúcares, bajos niveles de anhídrido carbónico disuelto y progresiva subida de la concentración de sal. Asimismo, se desarrollan bacilos Gram-negativos y Bacillus al comienzo del proceso, pero los microorganismos verdaderamente representativos de la fermentación son las levaduras cuya población aumenta rápidamente (mayor velocidad a medida que la concentración de sal es más baja y permanecen durante toda la conservación en niveles elevados, si bien, después de 180 días existe una tendencia general a disminuir. Las especies más abundantes son: Pichía membranae faciens (51%; Pichía fermentans (6% y Hansenula polimorpha (6%. En ningún tratamiento se observa arrugado ni alambrado en las aceitunas.

  15. El fenómeno de transducción en la prensa gráfica tucumana: los espejos de Valle Inclán junto a las pinturas negras de Goya

    OpenAIRE

    Pedicone, Elena Florencia

    2010-01-01

    Nos parece un singular reto referirnos hoy al fenómeno de transducción en la prensa gráfica para hablar con justeza de los beneficios que acarrea este fenómeno en la comunicación que establecen los medios. Desde nuestro interés por el uso de este dispositivo en la prensa escrita, entendemos que el periodista como transductor es el agente transmisor que saca una obra literaria de su órbita específica (las editoriales que la publican, los claustros académicos que la ponen en circulación, las re...

  16. El feminismo no puede ser uno porque las mujeres somos diversas: aportes a un feminismo negro decolonial desde la experiencia de las mujeres negras del Pacífico colombiano

    OpenAIRE

    Lozano Lerma, Betty Ruth

    2010-01-01

    El siguiente artículo expone el feminismo nacido en Europa y Norteamérica como elaboraciones discursivas coloniales que definieron lo que era ser mujer y feminista, y cómo las categorías género y patriarcado establecieron lo que era la subordinación de la mujer y también las posibilidades de su emancipación. Son discursos coloniales en el sentido en que han construido a las mujeres del tercer mundo, o del sur global, como un “otro”. El caso específico examinado en el presente artículo cuestio...

  17. Influencia de la dosificación en cemento sobre la corrosión de armaduras, negras y galvanizadas provocado por lo penetración de Cl- en el mortero

    Directory of Open Access Journals (Sweden)

    González, J. A.

    1981-09-01

    Full Text Available Not available

    En el presente trabajo se aborda el estudio de la corrosión de armaduras, tanto desnudas como galvanizadas, producida por la penetración de agua de mar en nueve calidades (dosificaciones y por lo tanto porosidades diferentes de mortero de cemento portland en el que se embebieron redondos a tres profundidades (0,5-1,5-2,5 cm. Las probeta de 7 X 7 X 7 cm se conservaron sumergidas durante 1 año. Para la evaluación de la velocidad de corrosión se ha utilizado la Resistencia de Polarización, técnica que permite el seguimiento continuo de la despasivación progresiva que provocan los Cl- al llegar a la armadura. Se aportan resultados sobre la penetración de Cl-, discutiéndose las relaciones encontradas entre: corrosión, % de Cl-, porosidad y dosificación de cemento. Finalmente se compara el comportamiento frente a la corrosión de las armaduras de acero desnudo respecto de las galvanizadas.

  18. Estudos histológicos sôbre as glândulas peçonhentas da "Viúva negra", Latrodectus mactans (Fabricius (Arachnida, Araneae, Theridiidae

    Directory of Open Access Journals (Sweden)

    Rudolf Barth

    1962-07-01

    Full Text Available A glândula peçonhenta de Latrodectus mactans compõe-se: 1. De um saco formado por uma membrana de tecido conjuntivo peritonial, que se projeta proximalmente no ducto de peçonha. 2. De um manto externo, formado por 40-45 feixes musculares, circundando 3/4 da glândula, helicoidalmente. Os feixes inserem-se nas extremidades apical e basal da membrana sarcoperitonial; sua contração impele a peçonha, através do ducto, para as garras. 3. Do epitélio glandular, composto: a de células da glândula principal, b de células da glândula auxiliar, c de célula da glândula situada à entrada do ducto. As células das glândulas principal e auxiliar, juntas, formam uma unidade glandular de natureza ragiócrina. A secreção das células da glândula auxiliar passa, através das membranas celulares, para o interior das células glandulares principais, deslocando-se, juntamente com a secreção destas, para o pólo apical, a que ambas confluem, formando uma substância viscosa, fortemente condensada em virtude da eliminação de certos líquidos. Após a formação de 8 a 10 destas porções de secreções, os dois tipos de células esgotam-se; não se dá a regeneração ou substituição por outras células. A quantidade de peçonha, uma vez produzida, é armazenada na cavidade da glândula, sendo suficiente para tôda a vida do animal. As células da glândula situada á entrada do ducto, ou glândula lipócrina, produzem uma substãncia lipóide. Esta substância dissolve uma porção de corpúsculos das secreções segregadas pelas células principais e auxiliares. O líquido resultante é inoculado no tecido da prêsa ou do inimigo, por contração do manto muscular. Ao mesmo tempo, novas porções da peçonha armazenada são transportadas no sentido proximal e dissolvidas no líquido lipóide, preparando-se, assim, nova peçonha para outra picada. As formas das células e os pormenores histológicos estão explicados nas figuras que acompanham êste texto. Os músculos da glândula, ao contrário do que afirmam outros autores, verificamos serem de natureza "tetãnica", apresentando uma estriação transversal, típica. Certas zonas, porém, ricas em sarcoplasma, possuem propriedades "tônicas", mantendo-se sempre em certo grau de contratura que provoca a tensão adequada na membrana sarcoperitonial, o que permite um efeito imediato da contração da parte tetânica, no momento da picada.

  19. On Dactylogyridae (Monogenea) of four species of characid fishes from Brazil

    OpenAIRE

    S. C. Cohen; Kohn A

    2009-01-01

    Material collected from the fishes from the dams and fish farms of the Departamento Nacional de Obras contra asSecas (DNOCS) and from the tanks of the Itaipu Hydroelectric Station was examined in order to analyze the index andthe infestation of Monogenea. Specimens of tambaqui (Colossoma macropomum), pacu (Piaractus mesopotamicus),pirapitinga (Piaractus brachypomus) and the hybrid tambacu (Colossoma macropomum X Piaractus mesopotamicus)were examined and five species of Monogenea were identifi...

  20. New Host, geographical record and a synonym for Phyllodistomum Spatula Odhner, 1902 (Trematoda, Gorgoderidae

    Directory of Open Access Journals (Sweden)

    Berenice M. M. Fernandes

    1984-06-01

    Full Text Available In the present note Phyllodistomum spatula Odhner, 1902 is recorded for the first time from Brazil and in a New host Colossoma macropomum (Cuvier, 1818 (Pisces, serrasalmidae, and Plyllodistomum spatulaeforme Odhner, 1902 is considered its synonym.Na presente nota Phyllodistomum spatula Odhner, 1902 é assinada pela primeira vez no Brasil, e em novo hospedeiro Colossoma macropomum (Cuvier, 1818; e Phyllodistomum spatulaeforme Odhner, 1902, considerado seu sinônimo.

  1. Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host

    OpenAIRE

    Martins, M. L.; SOUZA V. N. de; J. R. E. Moraes; MORAES F. R de; COSTA A. J. da

    1999-01-01

    The purpose of the study was to evaluate the susceptibility of 4 important cultivated fishes to sporozoan parasites. Fishes were collected bimonthly from a pond for a period of 1 year. Myxobolus colossomatis and Henneguya piaractus were found in the internal organs and gills, respectively. The combined incidence of parasitism by both myxozoa was 97.3% in pacu (Piaractus mesopotamicus), 33.3% in hybrid tambacu (Piaractus mesopotamicus x Colossoma macropomum), 5.6% in tambaqui (Colossoma macrop...

  2. Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host Avaliação comparativa da susceptibilidade de peixes cultivados à infecção natural com parasitos mixosporídeos e alterações teciduais no hospedeiro

    OpenAIRE

    Martins, M. L.; SOUZA V. N. de; J. R. E. Moraes; MORAES F. R de; DA COSTA, A J

    1999-01-01

    The purpose of the study was to evaluate the susceptibility of 4 important cultivated fishes to sporozoan parasites. Fishes were collected bimonthly from a pond for a period of 1 year. Myxobolus colossomatis and Henneguya piaractus were found in the internal organs and gills, respectively. The combined incidence of parasitism by both myxozoa was 97.3% in pacu (Piaractus mesopotamicus), 33.3% in hybrid tambacu (Piaractus mesopotamicus x Colossoma macropomum), 5.6% in tambaqui (Colossoma macrop...

  3. New Host, geographical record and a synonym for Phyllodistomum Spatula Odhner, 1902 (Trematoda, Gorgoderidae)

    OpenAIRE

    Berenice M. M. Fernandes

    1984-01-01

    In the present note Phyllodistomum spatula Odhner, 1902 is recorded for the first time from Brazil and in a New host Colossoma macropomum (Cuvier, 1818) (Pisces, serrasalmidae), and Plyllodistomum spatulaeforme Odhner, 1902 is considered its synonym.Na presente nota Phyllodistomum spatula Odhner, 1902 é assinada pela primeira vez no Brasil, e em novo hospedeiro Colossoma macropomum (Cuvier, 1818); e Phyllodistomum spatulaeforme Odhner, 1902, considerado seu sinônimo.

  4. Being Negro in Recife Brazil: A Political Aesthetics Approach

    NARCIS (Netherlands)

    Leerzem, van L.; Nuijten, M.C.M.; Vries, de P.A.

    2015-01-01

    In this article, we explore the role of cultura negra and what it means to be negro for a particular segment of the population of Recife, Brazil. We zoom in on participants in Terça Negra (negro Tuesday), one of the foremost weekly events in the city. For these participants, self-identifying as negr

  5. Extremely long-distance seed dispersal by an overfished Amazonian frugivore.

    Science.gov (United States)

    Anderson, Jill T; Nuttle, Tim; Saldaña Rojas, Joe S; Pendergast, Thomas H; Flecker, Alexander S

    2011-11-22

    Throughout Amazonia, overfishing has decimated populations of fruit-eating fishes, especially the large-bodied characid, Colossoma macropomum. During lengthy annual floods, frugivorous fishes enter vast Amazonian floodplains, consume massive quantities of fallen fruits and egest viable seeds. Many tree and liana species are clearly specialized for icthyochory, and seed dispersal by fish may be crucial for the maintenance of Amazonian wetland forests. Unlike frugivorous mammals and birds, little is known about seed dispersal effectiveness of fishes. Extensive mobility of frugivorous fish could result in extremely effective, multi-directional, long-distance seed dispersal. Over three annual flood seasons, we tracked fine-scale movement patterns and habitat use of wild Colossoma, and seed retention in the digestive tracts of captive individuals. Our mechanistic model predicts that Colossoma disperses seeds extremely long distances to favourable habitats. Modelled mean dispersal distances of 337-552 m and maximum of 5495 m are among the longest ever reported. At least 5 per cent of seeds are predicted to disperse 1700-2110 m, farther than dispersal by almost all other frugivores reported in the literature. Additionally, seed dispersal distances increased with fish size, but overfishing has biased Colossoma populations to smaller individuals. Thus, overexploitation probably disrupts an ancient coevolutionary relationship between Colossoma and Amazonian plants. PMID:21429923

  6. Aplicación de recubrimiento comestible adicionado con extractos etanólicos de propóleo y aceites esenciales a un producto cárnico tipo “luncheon fish”

    OpenAIRE

    Rodríguez Triviño, Andrea Paola

    2015-01-01

    El objetivo de este estudio fue determinar la funcionalidad tecnológica y el potencial conservante de recubrimientos comestibles a base de propóleo y aceites esenciales de la carne proveniente de especies dulceacuícolas: Cachama (Piaractus brachypomus), Yamú (Brycon amazonicus), Tilapia (Oreochromis niloticus) y Bocachico (Prochilodus magdalenae), se planteó la obtención de un producto cárnico tipo “Luncheon fish” a partir de carne de las especies. Para lo anterior se procedió con la determin...

  7. Myoarchitecture and vasculature of the heart ventricle in some freshwater teleosts.

    Science.gov (United States)

    Simões, K; Vicentini, C A; Orsi, A M; Cruz, C

    2002-05-01

    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, a less 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

  8. Vivir en un mundo de "blancos". Experiencias, reflexiones y representaciones de "raza" y clase de personas negras de sectores medios en Bogotá D.C / Living in a world of white people. Experiences, reflections and representations of race and class of the black middle class in Bogota D.C

    OpenAIRE

    Gil Hernández, Franklin Gerly

    2010-01-01

    En este trabajo se analizan las relaciones entre "raza" y clase a partir de un trabajo de campo en Bogotá D.C. y teniendo como marco el contexto social e histórico de las relaciones raciales en Colombia y América Latina. En este trabajo se reflexiona sobre las experiencias de discriminación racial de personas pertenecientes a sectores medios y sobre la producción subjetiva resultado de las relaciones raciales locales, cuestión que podríamos resumir en la pregunta ¿Qué tipos de sujetos son pro...

  9. Dinâmica populacional da mosca-negra-dos-citros Aleurocanthus woglumi ashby (hemiptera: aleyrodidae em Citrus spp. no município de São Luís - MA Populational dynamics of citrus blackfly Aleurocanthus woglumi ashby (hemiptera: aleyrodidae in Citrus spp. in São Luís, Maranhão, Brazil

    Directory of Open Access Journals (Sweden)

    Fabíola Rodrigues Medeiros

    2009-12-01

    Full Text Available O objetivo deste trabalho foi avaliar a dinâmica populacional de Aleurocanthus woglumi ao longo de um ano, verificando-se a época de maior ocorrência, seus picos populacionais e a distribuição dessa praga em dois pomares de Citrus spp. no município de São Luís - MA. Para o estudo da dinâmica populacional, foram selecionadas 10 plantas ao acaso, em cada pomar, coletando-se 20 folhas por planta, no período de julho de 2006 a junho de 2007, contando-se o número de posturas, ovos e ninfas. Para a determinação da distribuição de A. woglumi, as plantas foram divididas em quadrantes: norte, leste, sul e oeste, retirando-se 5 folhas/quadrante, totalizando-se 200 folhas por área de coleta. Com relação à distribuição na planta, o delineamento foi o inteiramente casualizado, adotando-se o esquema fatorial 2 x 4 (período seco e chuvoso x quadrante, com 13 repetições (nº de coletas. Realizou-se uma análise exploratória de dados, e as médias obtidas foram submetidas ao teste de Tukey, a 5% de probabilidade. Observou-se, nas duas localidades, que o inseto se distribuiu na copa da árvore de maneira homogênea e que os maiores níveis populacionais de A. woglumi ocorreram no período de baixa precipitação (julho a dezembro de 2006.This paper aims to evaluate the populational dynamics of Aleurocanthus woglumi throughout one year, verifying the season with higher density, its populational peaks and citrus blackfly distribution in Citrus spp. in two orchards, in São Luís, Maranhão, Brazil. To study the populational dynamics, 10 plants were selected at random, in each orchard, as well as 20 leaves per plant, from July 2006 to June 2007, and the number of layings, eggs and nymphs was counted. To determine the vertical distribution of A. woglumi, plants were divided into quadrants: North, East, South and West, and 5 leaves/quadrant were removed, totaling 200 leaves per collecting area. Regarding to distribution over the plant, the delineation was entirely randomized adopting a 2 x 4 factorial scheme (dry and rainy seasons x quadrants, with 13 repetitions (number of collections. It accomplished an exploratory analysis of data and averages submitted to Tukey test at a 5% probability rate. It was observed that on the two locations the insect was distributed homogeneous on the tree canopies and that the highest populational levels of A. woglumi occurred in the low precipitation season (from July to December 2006.

  10. Zumbi e a Construção da Identidade Negra: uma Análise sobre a História em Quadrinhos “Zumbi – A Saga de Palmares” * Zumbi and Formation of Black Identity: an Analysis on the Comics "Zumbi - The Saga of Palmares"

    Directory of Open Access Journals (Sweden)

    VINÍCIUS FINGER

    2013-04-01

    Full Text Available Resumo: O objetivo deste artigo é realizar uma análise do personagem de Zumbi encontrado no álbum em quadrinhos “Zumbi - A Saga de Palmares” e sua relação com os princípios, ideologias e políticas que embasaram os movimentos antirracistas ao longo do século XX. Analisa também os modos de construção da figura de Zumbi, através das narrativas propostas pelo Movimento Negro Unificado. Apresentando uma síntese dos movimentos antirracismo mais representativos no Brasil durante o século XX.Palavras-chaves: Zumbi – Palmares – MNU. Abstract: The aim of this article is to analyze Zumbi’s character found in the comic book "Zumbi - The Saga of Palmares" and its relationship with the principles, ideologies and policies which based anti-racist movements throughout the twentieth century. It also analyzes the forms of formation of the figure of Zumbi through the narratives proposed by the Unified Black Movement (Movimento Negro Unificado. It presents a summary of the most significant anti-racism movements in Brazil during the twentieth century.Keywords: Zumbi – Palmares – MNU.

  11. All Sexed Up: a resposta de mulheres lésbicas negras jovens ao sexo (mais) seguro em Johannesburg, África do Sul All Sexed Up: young black lesbian women's responses to safe(r) sex in Johannesburg, South Africa

    OpenAIRE

    Zethu Matebeni; Thais Medina Coeli Rochel de Camargo; Kenneth Rochel de Camargo Jr.; Laércio Fidelis Dias

    2009-01-01

    A saúde sexual de mulheres lésbicas não é um tema frequentemente discutido em nossas sociedades. As questões de saúde da mulher são classificadas sob uma única categoria abrangente e excluem algumas das preocupações específicas de mulheres lésbicas, que, em geral, não têm o mesmo comportamento em relação à saúde que as mulheres heterossexuais. Esta tendência se deve a uma série de razões, entre as quais: falta de conhecimento sobre saúde e risco sexuais lésbicos, medo de estigmatização pelos ...

  12. Vivenciando o racismo e a violência: um estudo sobre as vulnerabilidades da mulher negra e a busca de prevenção do HIV/aids em comunidades remanescentes de Quilombos, em Alagoas Living racism and violence: a study on the vulnerabilities of black women and the attempt to prevent HIV/AIDS in a Quilombo community in Alagoas

    Directory of Open Access Journals (Sweden)

    Jorge Luís de Souza Riscado

    2010-12-01

    Full Text Available OBJETIVO: Analisar as formas de violência racial e de gênero e o comportamento das mulheres quilombolas diante das DST/aids em Comunidades Remanescentes de Quilombos em Alagoas. MÉTODOS: Abordagem qualitativa, a partir de 10 grupos focais, constituídos de 12 a 18 mulheres, com idade variável entre 16 a 55 anos, em que foram abordadas as temáticas gênero, racismo, violência doméstica, exame ginecológico preventivo, uso das Unidades Básicas de Saúde (USB e do Programa Saúde da Família (PSF, doenças sexuais transmissíveis, parcerias sexuais, uso de camisinha, uso de drogas. O aporte teórico foi da fenomenologia de base existencialista proposta por Merleau-Ponty e o referencial foucaultiano. RESULTADOS: A análise dos depoimentos apontou que um acentuado contingente de mulheres padece de violência doméstica em níveis físico, sexual, psicológico, patrimonial e moral. Quanto ao racismo, as mulheres quilombolas disseram ser vítimas de preconceito racial, com expressões de subestimação, humilhação na rua, na escola, em festas, em atendimento em postos de saúde. Evidenciou-se um grau alto de vulnerabilidade à infecção por DST/aids e outros agravos, pela ausência de uma política de saúde mais efetiva e de um trabalho educativo nessas comunidades. CONCLUSÕES: Os dados obtidos revelaram as precárias condições de vida, as dificuldades de acesso aos serviços de saúde, a falta de prática preventiva para as doenças sexualmente transmissíveis. Faz-se necessária uma intervenção efetiva e perene dos organismos do Estado na área da educação, da saúde, visando à promoção da equidade, racial e de gênero e à saúde das mulheres quilombolas.OBJECTIVE: To analyze the forms of racial and gender violence, quilombola women's behavior regarding STD/AIDS, in Quilombos Remaining Communities in Alagoas. METHODS: Qualitative approach from 10 focus groups, comprising 12 to 18 women, with age ranging from 16 to 55, which permeated the themes of gender, racism, domestic violence, gynecological preventive exam, HBU (Health Base Unit/FHP (Family Health Program use, sexually transmitted diseases, sexual partnerships, condom use, drugs. The theoretical framework reference is based on phenomenology, proposed by existentialist Merleau-Ponty, and on the theoretical contribution of Foucault. RESULTS: The statements indicated that a strong contingent of women suffering from domestic violence in physical, sexual, psychological, and moral heritage. As for racism, the quilombola women expressed that they are victims of racial prejudice, with underestimating expressions, humiliations in the street, at school, at parties, in attendance at public health clinics. In the speech, it became clear that they are very vulnerable to infection of STD/AIDS and other health problems, lack of a more effective health policy and educational work in these communities. CONCLUSIONS: These data revealed the precarious living conditions of this population, poor access to health services, lack of preventive practice for sexually transmitted diseases. It is necessary a long-term effective intervention of the state agencies in education and health, aimed at promoting racial and gender equity of the Quilombola women and their health.

  13. Zumbi e a Construção da Identidade Negra: uma Análise sobre a História em Quadrinhos “Zumbi – A Saga de Palmares” * Zumbi and Formation of Black Identity: an Analysis on the Comics "Zumbi - The Saga of Palmares"

    OpenAIRE

    VINÍCIUS FINGER

    2013-01-01

    Resumo: O objetivo deste artigo é realizar uma análise do personagem de Zumbi encontrado no álbum em quadrinhos “Zumbi - A Saga de Palmares” e sua relação com os princípios, ideologias e políticas que embasaram os movimentos antirracistas ao longo do século XX. Analisa também os modos de construção da figura de Zumbi, através das narrativas propostas pelo Movimento Negro Unificado. Apresentando uma síntese dos movimentos antirracismo mais representativos no Brasil durante o século XX.Palavras...

  14. Vivenciando o racismo e a violência: um estudo sobre as vulnerabilidades da mulher negra e a busca de prevenção do HIV/aids em comunidades remanescentes de Quilombos, em Alagoas Living racism and violence: a study on the vulnerabilities of black women and the attempt to prevent HIV/AIDS in a Quilombo community in Alagoas

    OpenAIRE

    Jorge Luís de Souza Riscado; Maria Aparecida Batista de Oliveira; Ângela Maria Benedita Bahia de Brito

    2010-01-01

    OBJETIVO: Analisar as formas de violência racial e de gênero e o comportamento das mulheres quilombolas diante das DST/aids em Comunidades Remanescentes de Quilombos em Alagoas. MÉTODOS: Abordagem qualitativa, a partir de 10 grupos focais, constituídos de 12 a 18 mulheres, com idade variável entre 16 a 55 anos, em que foram abordadas as temáticas gênero, racismo, violência doméstica, exame ginecológico preventivo, uso das Unidades Básicas de Saúde (USB) e do Programa Saúde da Família (PSF), d...

  15. "A carne mais barata do mercado é a carne negra: uma reflexão sobre o "design" das camisas da Puma na Copa do Mundo de Futebol/2010 "The cheapest flesh in the market is the black one": body, soccer and advertising Puma uniforms in the 2010 soccer world cup

    Directory of Open Access Journals (Sweden)

    Victor Andrade de Melo

    2011-06-01

    Full Text Available A Puma, uma empresa de material esportivo, desde meados da primeira década do século XXI tem constantemente utilizado jogadores negros em suas campanhas publicitárias, parte de uma estratégia de busca de aproximação com o continente africano. À beira da falência no início dos anos 90, a empresa conseguiu se reposicionar no mercado unindo o esporte à moda, investindo em produtos de "design" arrojado. Uma de suas iniciativas foi buscar inspiração no "caráter exótico" das nações africanas para produzir peças que possam ser utilizadas em situações cotidianas, não só para a prática de esportes. Como o corpo do negro africano tem sido representado em suas estratégias publicitárias? Esse estudo teve por objetivo analisar um ponto específico da publicidade da Puma por ocasião da Copa do Mundo de Futebol de 2010, realizada na África do Sul: o "design" das camisas fornecidas a três seleções africanas - Camarões, Costa do Marfim e Gana. Para alcance do objetivo, entabulamos uma comparação com os modelos das camisas fornecidas pela empresa a outros selecionados (Suíça, Uruguai e Itália, prospectando o quanto suas ações publicitárias reforçam ou não certos estereótipos comumente observados quando se utilizam negros em campanhas de publicidade.Puma, a company of sport gears, has been inserting black soccer players in its advertising campaigns as a strategy to get closer to the African continent. Near to bankruptcy at the 90' beginning, the company has succeeded in bringing to the market products with more daring design, linking fashion and sports. One of its latest initiatives was to seek inspiration in the exotic profile of African people to produce pieces that can be used in all occasions not only for sports. How African's bodies have been exposed in its adverting campaigns? The objective of this study was to analyze an specific issue related to some strategies adopted in Puma advertising campaigns launched during 2010 Soccer World Cup in South Africa: the layout of the uniforms offered for three African´s teams - Cameroon, Côte d'Ivoire, Ghana. In order to do it, we have established a comparison with the models of shirts fabricated by the company to other national teams (Switzerland, Uruguay and Italy, taking into account the fact that this sort of merchandising may increase or not some stereotypes that are usually associated with black people in advertising campaigns.

  16. All Sexed Up: a resposta de mulheres lésbicas negras jovens ao sexo (mais seguro em Johannesburg, África do Sul All Sexed Up: young black lesbian women's responses to safe(r sex in Johannesburg, South Africa

    Directory of Open Access Journals (Sweden)

    Zethu Matebeni

    2009-01-01

    Full Text Available A saúde sexual de mulheres lésbicas não é um tema frequentemente discutido em nossas sociedades. As questões de saúde da mulher são classificadas sob uma única categoria abrangente e excluem algumas das preocupações específicas de mulheres lésbicas, que, em geral, não têm o mesmo comportamento em relação à saúde que as mulheres heterossexuais. Esta tendência se deve a uma série de razões, entre as quais: falta de conhecimento sobre saúde e risco sexuais lésbicos, medo de estigmatização pelos prestadores de serviço e o processo de "se assumir" (coming out para esses profissionais, que além de desconhecido, é, algumas vezes, hostil. Além disso, a pouca pesquisa sobre lésbicas e saúde lésbica na África do Sul torna difícil para as mulheres que assim se autoclassificam saberem que questões de saúde sexual as afetam especificamente, bem como onde e de que forma lidar com certos problemas. Existe uma percepção equivocada e generalizada de que questões de sexo seguro não afetam mulheres lésbicas tanto quanto mulheres heterossexuais. O artigo apresenta as visões de um grupo de mulheres de 18 a 35 anos que se autoidentificam como lésbicas na África de Sul. Por meio de questionários autoaplicados e discussões, essas mulheres partilham suas experiências e pensamentos sobre sexo lésbico (seguro e como elas têm-se relacionado e continuam a se relacionar sexualmente com outras mulheres no momento de HIV e Aids.Lesbian women's health and sexual health is a theme not generally discussed in our societies. Women's' health issues are generally classified under one umbrella, and exclude some of the concerns specific to lesbian women. Lesbian women in general do not have the same health-seeking behaviours as heterosexual women. This is due to a number of reasons including: lack of knowledge about lesbian sexual health and sexual risk, fear of stigmatization by service providers, and the "coming out" process to unfamiliar and sometimes unsympathetic health-related service providers. Furthermore, limited research on lesbians and lesbian health in South Africa makes it difficult for lesbian women to know what sexual health issues affect them specifically, where and how to address these issues. There is a general misconception that safe sex issues do not affect lesbian women as much as they affect heterosexual women. The paper presents views of a group of young self-identified lesbian women in South Africa between the ages of 18 and 35. Through self-administered questionnaires and discussions these women share their experiences and thoughts of lesbian (safe sex and how they have related and continue to relate sexually with other women in the time of HIV and Aids.

  17. Effect of alcoholic extract of guaco (Mikania glomerata) on the control of dark rot (Xanthomonas campestris pv. campestris) in cauliflower/
    Avaliação da eficácia da tintura etanólica de guaco (Mikania glomerata) no controle da podridão negra (Xanthomonas campestris pv. campestris) em couve-flor

    OpenAIRE

    Kátia Regina Freitas Schwan-Estrada; Odair José Kuhn; Roberto Luiz Portz; Gilmar Franzener; José Renato Stangarlin; Sandra Cristina Vigo-Schultz

    2006-01-01

    With the use of irrigation and new hybrids of cauliflower, it is possible to get production during all the year with hight yield. However, the crop has been affected by diseases, as the dark rot caused by X. campestris pv. campestris. The objective of this research work was to study the potential of Mikania glomerata for the control of this disease. Alcoholic extract 50 ºGL of M. glomerata was evaluated regarding to: in vitro antimicrobial activity through bacterial growth in 100, 250, 500 an...

  18. Black locus (Robinia pseudoacacia L.) and Honey locust (Gleditsia triacanthos L.): technological aspects in relation with the use in solid wood products; Acaia blanca (Robinia pseudoacacia L.) y acacia negra (Gleditsia triacanthos L.): aspectos tecnologicos y relacionados al empleo en productos de madera maciza

    Energy Technology Data Exchange (ETDEWEB)

    Keil, G.; Spavento, E.; Murace, M.; Millanes, A.

    2011-07-01

    Robinia pseudoacacia L. and Gleditsia triacanthos L, are tree species from USA and both was introduced in Europe. In the province of Buenos Aires, Argentina, plantations of these species are scattered, whose wood hasn't been characterized technologically by standardized tests. The objective of this job was to characterize technologically Black locus and Honey locust woods, both implanted in the province of Buenos Aires for its inclusion in the timber market. The physical and mechanical properties determined were: content humidity, apparent densities, dimensional changes, Janka hardness, static bending, cut parallel to fibers,compression perpendicular and parallel to fibers. Natural durability was estimated. Black locus and Honey locust woods were medium density and medium stability, hard, resistant to the cut and the compression perpendicular to fibers and showed values medium to low in parameters of static bending and compression parallel to fibers, values to take into account when designing structural elements. Black locus was the most resistant to fungal degradation. Both woods can be considered suitable for high-value uses in the construction and furniture industries (interior and exterior). (Author) 29 refs.

  19. Adaptação de instrumento: avaliação da imagem corporal em crianças e adolescentes de raça negra residentes em Portugal : trabalho de investigação : Adaptation of tool: body image assessment in children and adolescents of black race residents in Portugal

    OpenAIRE

    Oliveira, Ana Lucília Marçal

    2009-01-01

    Contém um relatório de estágio curricular realizado na Unidade Autónoma de Gestão da Mulher e da Criança do Serviço de Pediatria do Hospital S.João, Porto, e no Hospital Privado da Boavista, Porto, no âmbito da licenciatura em Ciências da Nutrição pela Faculdade de Ciências da Nutrição e Alimentação da Universidade do Porto. O exemplar do relatório de estágio existe apenas em formato papel e está disponível para consulta na Biblioteca da FCNAUP Tese de licenciatura em Ciências da Nutrição ...

  20. Molecular Tools for Rapid and Accurate Detection of Black Truffle (Tuber melanosporum Vitt. in Inoculated Nursery Plants and Commercial Plantations in Chile Uso de Marcadores Moleculares para la Detección Rápida y Precisa de Trufa Negra (Tuber melanosporum Vitt. en Plantas de Vivero y Plantaciones Comerciales de Chile

    Directory of Open Access Journals (Sweden)

    Cecilia Cordero

    2011-09-01

    Full Text Available Truffle (Tuber melanosporum Vitt. culture is an agroforestry sector in Chile of increasing interest due to the high prices that truffles fetch in the national market and the recent evidence that its commercial production is possible in Chilean climatic and soil conditions. In this study, the efficiency of three methods of DNA extraction from a mix of 5 g of soil and roots from both nursery and field plants of Quercus ilex L. mycorrhized with T. melanosporum were evaluated, and a simple and reproducible protocol was established. Detection of T. melanosporum was performed by the technique of cleaved amplified polymorphic sequence (CAPS from amplicons generated with the primers ADL1 (5´-GTAACGATAAAGGCCATCTATAGG-3´ and ADL3 (5´-CGTTTTTCCTGAACTCTTCATCAC-3`, where a restriction fragment of 160 bp specific for T. melanosporum was generated, which allows the discrimination of this species from the rest of the species belonging to the Tuber sp. genus. Direct detection of T. melanosporum in one step was also obtained by polymerase chain reaction (PCR from total DNA isolated from mycorrhized roots and with the primers ITSML (5´-TGGCCATGTGTCAGATTTAGTA-3´ and ITSLNG (5´-TGATATGCTTAAGTTCAGCGGG-3´, generating a single amplicon of 440 bp. The molecular detection of T. melanosporum by the methods presented here will allow the rapid and accurate detection of mycorrhization of trees, both under nursery and field conditions. This technology will also provide more security to farmers by controlling the quality of the mycorrhized trees they will plant and also by following the mycorrhization status of established orchards.

  1. GC/MS in the study of deterioration process of historical monuments: characterization of the black crust formed in the Cathedral of Seville; GC/MS en el estudio del proceso de deterioro de monumentos historicos: caracterizacion de la costra negra presente en la Catedral de Sevilla

    Energy Technology Data Exchange (ETDEWEB)

    Reyes, J. [Programa de Corrosion del Golfo de Mexico. Universidad Autonoma de Campeche. Av. Agustin Melgar s/n, Campeche (Mexico); Hermosin, B.; Saiz J, C. [Instituto de Recursos Naturales y Agrobiologia de Sevilla. Avenida de la Reina Mercedes 10. Sevilla, Espana (Spain)]. e-mail: javreyes@uacam.mx

    2006-07-01

    Here, we present an interesting application of Gas Chromatography/Mass Spectrometry (GC/MS) technique which permitted to differentiate successfully between natural and anthropogenic compounds present in the black crust formed in the Cathedral of Seville. This building, considered as one of the most important historic and cultural European monuments suffers from intense blackening of its outside walls and sculptures due to the interaction with the urban environment. Fragment of black crusts were removed from the Cathedral walls and extraction process with organic solvents was carried out. The aliphatic, aromatic and polar fractions were separated and analyzed using GC/MS. A complex organic composition of the black crusts indicated the accumulative character of the deposition process of atmospheric particles as a function of the time. The presence of high molecular weight n-alkanes, n-fatty acids and natural molecular markers identified during the study were indicative of current biogenic contributions. It was also found an important group of petrogenic molecular markers related with diesel soot emissions from motor engines. The diesel soot and molecular markers were entrapped within the black crust mineral matrix and contribute to the observed blackening of the Seville Cathedral. (Author)

  2. Cultura negra y turismo en Ilhéus, Brasil: Publicidad turística, contacto cultural y clichés Black Culture and Tourism in Ilhéus , Brazil: Tourist Publicity, Cultural Contact and Clichés

    Directory of Open Access Journals (Sweden)

    Sandro Campos Neves

    2008-12-01

    Full Text Available Este artículo analiza la interacción cultural entre turistas y grupos afro-culturales en la ciudad de Ilhéus, Brasil, a través de iniciativas estatales y privadas como las de los agentes turísticos. El trabajo rescata desde el punto de vista etnográfico dos oportunidades en las cuales se produce esa interacción, una promovida por la municipalidad y la otra por los hoteles privados. Estos encuentros culturales se basan en imágenes estereotipadas de la cultura local, las cuales se reconfirman al producirse la interacción con los turistas.This article analyzes the cultural interaction between tourists and afro-cultural groups in the city or Ilhéus , Brazil by means of state and private initiatives as the tourist agents. From the ethnographic point of view, the paper draws attention on the two opportunities in which this encounter comes into being: one promoted by the city and the other by private hotels. These encounters are based on stereotyped images of the locals which are reconfirmed when this interaction occurs.

  3. New host records and description of the egg of Anacanthorus penilabiatus (Monogenea, Dactylogyridae)

    OpenAIRE

    Pamplona-Basilio MC; A. Kohn; VA Feitosa

    2001-01-01

    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.

  4. New host records and description of the egg of Anacanthorus penilabiatus (Monogenea, Dactylogyridae).

    Science.gov (United States)

    Pamplona-Basilio, M C; Kohn, A; Feitosa, V A

    2001-07-01

    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. PMID:11500767

  5. 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.

  6. A set of sustainability performance indicators for seafood : direct human consumption products from Peruvian anchoveta fisheries and freshwater aquaculture

    OpenAIRE

    Avadi, A.; Fréon, Pierre

    2015-01-01

    Different seafood products based on Peruvian anchoveta (Engraulis ringens) fisheries and freshwater aquaculture of trout (Oncorhynchus mykiss), tilapia (Oreochromis spp.) and black pacu (Colossoma macropomum), contribute at different scales to the socio-economic development, environmental degradation and nutrition of the Peruvian population. Various indicators have been used in the literature to assess the performance of these industries regarding different aspects of sustainability, notably ...

  7. Members of the Parliamentary Select Committee on Trade and Industry of the United Kingdom visit the CMS assembly hall.

    CERN Multimedia

    Patrice Loïez

    2002-01-01

    Left to right: Austin Ball, Martin O'Neill (Chairman), Richard Burden, Jonathan Djanogly, Lindsay Hoyle, Roger Berry, Linda Perham, Sir Robert Smith, Jackie Lawrence, Michel Della Negra, Tejinder Virdee, Ashok Kumar.

  8. Kuula. Pariisist Tokiosse, diivanilt tõusmata / Mart Juur

    Index Scriptorium Estoniae

    Juur, Mart, 1964-

    2007-01-01

    Heliplaatidest: Ozzy Osbourne "The Essential", Art Garfunkel "Some Enchanted Evening", Richard Galliano "Luz Negra", Music From Motion Picture "Dreamgirls", "Blue Note Trip Jazzanova", Mika "Life in Cartoon Motion". Prantsuse elektroonilise muusika ansamblist Air, heliplaadist "Pocket Symphony"

  9. Excursión desde Madrid a Valladolid el 20 de noviembre de 1955

    OpenAIRE

    Valverde Gómez, José Antonio, 1926-2003

    2008-01-01

    Viaje desde Madrid a Valladolid el 20 de noviembre de 1955, del que se anotaron las especies de aves de cinco localidades, siendo en Villacastín (Segovia): Alauda arvensis (Alondra común), Corvus corone (Corneja negra), Falco tinnunculus (Cernícalo vulgar), Milvus milvus (Milano real), Pica pica (Urraca, llamada "marica" y "picarza" por el autor) y Sylvia undata (Curruca rabilarga), en Labajos (Segovia): Carduelis carduelis (Jilguero), Corvus corone (Corneja negra), Fringilla coelebs (Pinzón ...

  10. Miocene characid fishes from Colombia: evolutionary stasis and extirpation.

    Science.gov (United States)

    Lundberg, J G; Machado-Allison, A; Kay, R F

    1986-10-10

    Fossil fishes from the Miocene La Venta fauna of the Magdalena River Valley, Colombia, are identified as Colossoma macropomum (Characidae), a living species from the Orinoco and Amazon basins. The fossils document a long and conservative history for a species that is highly specialized for feeding on streamside plants. The phylogenetically advanced position of Colossoma in the subfamily Serrasalminae implies that six related genera and other higher characid taxa originated well before 15 million years ago. This discovery also corroborates neontological evidence for a vicariance event that contributed species from Miocene Orinoco-Amazon faunas to the original Magdalena region fauna. The fossils suggest a formerly diverse Magdalena fauna that has suffered local extinction, perhaps associated with late Cenozoic tectonism. This new evidence may help explain the depauperate nature of the modern Magdalena River. PMID:17746480

  11. Chromosome mapping of repetitive sequences in four Serrasalmidae species (Characiformes)

    OpenAIRE

    Leila Braga Ribeiro; Daniele Aparecida Matoso; Eliana Feldberg

    2013-01-01

    The Serrasalmidae family is composed of a number of commercially interesting species, mainly in the Amazon region where most of these fishes occur. In the present study, we investigated the genomic organization of the 18S and 5S rDNA and telomeric sequences in mitotic chromosomes of four species from the basal clade of the Serrasalmidae family: Colossoma macropomum, Mylossoma aureum, M. duriventre, and Piaractus mesopotamicus, in order to understand the chromosomal evolution in the family. Al...

  12. Isolation and characterization of Flavobacterium columnare (Bernardet et al. 2002) from four tropical fish species in Brazil Isolamento e caracterização de Flavobacterium columnare de quatro espécies de peixes tropicais no Brasil

    OpenAIRE

    F. Pilarski; AJ. Rossini; PS. Ceccarelli

    2008-01-01

    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 w...

  13. Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host Avaliação comparativa da susceptibilidade de peixes cultivados à infecção natural com parasitos mixosporídeos e alterações teciduais no hospedeiro

    Directory of Open Access Journals (Sweden)

    M. L. MARTINS

    1999-05-01

    Full Text Available The purpose of the study was to evaluate the susceptibility of 4 important cultivated fishes to sporozoan parasites. Fishes were collected bimonthly from a pond for a period of 1 year. Myxobolus colossomatis and Henneguya piaractus were found in the internal organs and gills, respectively. The combined incidence of parasitism by both myxozoa was 97.3% in pacu (Piaractus mesopotamicus, 33.3% in hybrid tambacu (Piaractus mesopotamicus x Colossoma macropomum, 5.6% in tambaqui (Colossoma macropomum and 0% in carp (Cyprinus carpio. Pacu was the most susceptible fish and was parasitized 79.2% in the gills, 66.7% in the kidney and 50% in the spleen. Histopathological evaluation of the gills showed hemorrhages, inflammatory reaction with mononuclear cells and fibroblasts and hyperplasia of basal and goblet cells.O objetivo deste estudo foi avaliar a susceptibilidade de 4 importantes peixes cultivados a parasitos esporozoários. Os peixes foram coletados bimestralmente de um tanque de cultivo, durante 1 ano. Myxobolus colossomatis e Henneguya piaractus foram encontrados nos órgãos internos e brânquias, respectivamente. A incidência de ambos os parasitos foi de 97,3% em pacu (Piaractus mesopotamicus, 33,3% no híbrido tambacu (Piaractus mesopotamicus x Colossoma macropomum, 5,6% em tambaqui (Colossoma macropomum e 0% em carpa (Cyprinus carpio. Pacu foi o peixe mais susceptível, encontrando-se parasitado 79,2% nas brânquias, 66,7% nos rins e 50% no baço. A análise histopatológica das brânquias mostrou hemorragias, reação inflamatória com células mononucleares, fibroblastos e hiperplasia das células basais e mucosas.

  14. Tambaqui growth and survival when exposed to different photoperiods Crescimento e sobrevivência do tambaqui exposto a diferentes fotoperíodos

    OpenAIRE

    Paulo Henrique Rocha Aride; Rodrigo Roubach; Sérgio Ricardo Nozawa; Adalberto Luís Val

    2006-01-01

    The use of different photoperiods (light) were investigated during tambaqui (Colossoma macropomum) juvenile growth under captivity. Light intensity tested was: continuous dark (24hrs without light), natural photoperiod simulation (10hrs of light and 14hrs without light) and continuous light (24 with light). No mortality was recorded among treatments. Significant differences was observed after 50 days of experiment among mean fish weight, fish kept under a continuous darkness showed a better s...

  15. Extremely long-distance seed dispersal by an overfished Amazonian frugivore

    OpenAIRE

    Anderson, Jill T.; Nuttle, Tim; Saldaña Rojas, Joe S.; Pendergast, Thomas H.; Flecker, Alexander S.

    2011-01-01

    Throughout Amazonia, overfishing has decimated populations of fruit-eating fishes, especially the large-bodied characid, Colossoma macropomum. During lengthy annual floods, frugivorous fishes enter vast Amazonian floodplains, consume massive quantities of fallen fruits and egest viable seeds. Many tree and liana species are clearly specialized for icthyochory, and seed dispersal by fish may be crucial for the maintenance of Amazonian wetland forests. Unlike frugivorous mammals and birds, litt...

  16. Estudio de la modulación del receptor µ opioide por el receptor dopaminérgico D4. Implicación en la adicción a morfina

    OpenAIRE

    Valderrama Carvajal, Alejandra

    2014-01-01

    La morfina se utiliza en el ámbito clínico por ser un potente analgésico, sin embargo produce efectos adversos como la adicción. La administración de morfina induce una liberación masiva de dopamina en el estriado, produciendo los efectos de refuerzo y consolidación de hábitos adictivos. La actividad de las neuronas dopaminérgicas de la sustancia negra compacta está regulada por proyecciones GABAérgicas de la sustancia negra reticular (SNr) y del caudado putamen (CPu). En ambas regiones se lo...

  17. Facies anóxicas, procesos deposicionales y herpetofauna de la rampa marina titoniano-berriasiana en la Cuenca Neuquina (Yesera del Tromen), Neuquén, Argentina

    OpenAIRE

    Luis A. Spalletti; Zulma Gasparini; Gonzalo Veiga; Ernesto Schwarz; Marta Fernández; Sergio Matheos

    1999-01-01

    RESUMEN Se estudia una localidad ubicada en el centro de la Cuenca Neuquina (La Yesera del Tromen, Provincia del Neuquén, República Argentina), portadora de una importante fauna de reptiles marinos. Los restos se encuentran en la sección inferior (Titonjano-Berriasiano) de la Formación Vaca Muerta, constituida por un potente espesor de lutitas negras asociadas con margas también negras y delgados niveles de 'packstones, wackestones' y sedimentos silicoclásticos finos producto de lluvias de ce...

  18. The ANDES Deep Underground Laboratory

    CERN Document Server

    Bertou, X

    2013-01-01

    ANDES (Agua Negra Deep Experiment Site) is a unique opportunity to build a deep underground laboratory in the southern hemisphere. It will be built in the Agua Negra tunnel planned between Argentina and Chile, and operated by the CLES, a Latin American consortium. With 1750m of rock overburden, and no close- by nuclear power plant, it will provide an extremely radiation quiet environment for neutrino and dark matter experiments. In particular, its location in the southern hemisphere should play a major role in understanding dark matter modulation signals.

  19. Evaluación del funcionamiento de un sistema alternativo de humedales artificiales para el tratamiento de aguas residuales

    OpenAIRE

    Roy Pérez Salazar; Carolina Alfaro Chinchilla; Jihad Sasa Marín; Juan Agüero Pérez

    2013-01-01

    En Costa Rica, las aguas negras generalmente son depositadas en tanques sépticos en donde se dan procesos de sedimentación y el efluente se infiltra en el subsuelo. Esta actividad representa un gran riesgo para la salud humana y un impacto negativo en el medio ambiente debido a la posible contaminación de aguas subterráneas. En este caso de estudio, se presenta la aplicación de un humedal artificial horizontal de flujo subsuperficial para el tratamiento de aguas negras en una industria cosmét...

  20. Hannah Arendt: el delito original de los Estados Unidos || Hannah Arendt and the United States Original Crime

    OpenAIRE

    Ballesteros-Soriano, Alfonso

    2016-01-01

    Hannah Arendt aborda el problema del racismo contra la población negra en los Estados Unidos en el ámbito social y en el político, dos esferas de la vida humana que distingue cuidadosamente. Esta doble perspectiva ofrece un perfil completo de lo que denomina el “delito original” de los Estados Unidos: la esclavitud y la exclusión del pueblo negro e indio de la Constitución de 1787. Sus reflexiones sobre la educación pública segregada y sobre la desobediencia civil entre la población negra con...