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Sample records for del pino radiata

  1. INFLUENCIA DE LA MADERA JUVENIL DE PINO RADIATA SOBRE LAS PROPIEDADES MECÁNICAS DE TABLEROS OSB

    OpenAIRE

    PECHO,Robert; ANANIAS,Rubén A; BALLERINI,Aldo; CLOUTIER,Alain

    2004-01-01

    En este trabajo se estudia la influencia de la madera juvenil de pino radiata (Pinus radiata D. Don) sobre las propiedades mecánicas de tableros de hojuelas orientadas OSB. La madera para los ensayos es recogida de 10 árboles en pié de 26 años creciendo en plantaciones manejadas de la Octava región, Chile. La determinación de madera juvenil se realiza observando la variación radial de los anillos de crecimiento de la madera, usando un analizador de anillos en base a rayos X. Los detalles de l...

  2. Density determination in Pino Radiata (D.Don) samples using 59.5 keV gamma radiation attenuation

    International Nuclear Information System (INIS)

    Dinator, Maria I.; Morales, Jose R.; Aliaga, Nelson; Karsulovic, Jose T.; Sanchez, Jaime; Leon, Adolfo

    1996-01-01

    A non destructive method to determine wood samples density is presented. The photon mass attenuation coefficient in samples of Pino radiata (D.Don) was measured at 59.5 keV with a radioactive source of Am-241. The value of 0.192 ± 0.002 cm 2 /g was obtained with a gamma spectroscopy system and later used on the determination of the mass density in sixteen samples of the same species. Comparison of these results with those of gravimetric method through a linear regression showed a slope of 1.001 and a correlation factor of 0.94. (author)

  3. Eficacia del difusor de feromona de procesionaria del pino Pherocon PPM®

    OpenAIRE

    Durán, María; Rodrigo Santamalia, Mª Eugenia; Pérez Laorga, Eduardo; Mas i Gisbert, Hugo

    2012-01-01

    Los resultados de este trabajo forman parte del trabajo de fin de carrera presentado en la Universidad Politecnica de Valencia por Maria Duran Lázaro y dirigido por la Dra. Eugenia Rodrigo Santamalia y Eduardo Perez Laorga con el titulo "Influencia del tipo de trampa en la captura de mariposas de la procesionaria del pino (Thaumetopoea pityocampa Schiff.) en la sierra Calderona" [ES] Se ha ensayado la eficacia de un difusor de la feromona de la procesionaria del pino fabricado por la em...

  4. Density determination in Pino Radiata (D.Don) samples using 59.5 keV gamma radiation attenuation; Determinacion de densidad en muestras de Pino Radiata (D. Don) mediante atenuacion de radiacion gamma de 59.5 KeV

    Energy Technology Data Exchange (ETDEWEB)

    Dinator, Maria I; Morales, Jose R; Aliaga, Nelson [Chile Univ., Santiago (Chile). Dept. de Fisica; Karsulovic, Jose T; Sanchez, Jaime; Leon, Adolfo [Chile Univ., Santiago (Chile). Dept. de Tecnologia de la Madera

    1997-12-31

    A non destructive method to determine wood samples density is presented. The photon mass attenuation coefficient in samples of Pino radiata (D.Don) was measured at 59.5 keV with a radioactive source of Am-241. The value of 0.192 {+-} 0.002 cm{sup 2}/g was obtained with a gamma spectroscopy system and later used on the determination of the mass density in sixteen samples of the same species. Comparison of these results with those of gravimetric method through a linear regression showed a slope of 1.001 and a correlation factor of 0.94. (author). 3 refs., 4 figs.

  5. IDENTIFICACION DEL CILINDRO NUDOSO EN IMÁGENES TC DE TROZAS PODADAS DE PINUS RADIATA UTILIZANDO REDES NEURONALES ARTIFICIALES

    OpenAIRE

    Rojas Espinoza,Gerson; Ortiz Irribarren,Oscar

    2010-01-01

    La factibilidad de identificar el cilindro nudoso en imágenes de tomografía computarizada de rayos X (TC) de trozas podadas de pino radiata (Pinus radiata D. Don), fue evaluada utilizando un método de clasificación supervisada basado en Redes Neuronales Artificiales (RNA). El proceso de clasificación consideró también la identificación de la zona libre de defectos y nudos. Treinta trozas podadas de pino radiata fueron escaneadas en un escáner médico multi-slice de rayos X, donde las imágenes ...

  6. Efecto de plantaciones de pino en la artropofauna del suelo de un bosque Altoandino

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    Alba Lucía León-Gamboa

    2010-09-01

    Full Text Available Los artrópodos del suelo son un componente fundamental de los ecosistemas de bosque, ya que participan en la fragmentación de los residuos orgánicos previa a la descomposición. Esta función es más valuable en ambientes de altura, donde las bajas temperaturas limitan la dinámica de los procesos biológicos. Sin embargo, uno de los problemas más comunes en las montañas colombianas ha sido el reemplazo de vegetación nativa por plantaciones de pino. Los efectos sobre los artrópodos del suelo aún son poco conocidos. En un remanente de bosque Altoandino (Embalse del Neusa-Colombia con una plantación adyacente de unos 50 años (aprox. 900 has, fue evaluada la composición, riqueza y abundancia de artrópodos en los estratos superficial (S orgánico (O y mineral (A del suelo, para establecer las diferencias asociadas con la transformación del uso del suelo. Se utilizaron trampas "Pitfall" para registrar el movimiento de fauna epígea, y embudos Berlese para estimar la densidad de fauna de los horizontes O y A. Se calcularon los índices de Shannon y Simpson para estimar la diversidad en diferentes lugares y horizontes, además fue evaluada la estructura trófica de la comunidad. Se recolectaron 38 306 individuos en el bosque y 17 386 en la plantación, principalmente distribuidos en los taxa Collembola, (42.4%, Acari (27%, Diptera (17.6% y Coleoptera (4.6%. Las diferencias más importantes se dieron en la superficie, donde la movilización en bosque (86 individuos/día casi triplicó la movilización en la plantación (33 individuos/día. Las diferencias en la composición se dieron en los taxa Collembola, Araneae, Hemiptera, Homoptera e Hymenoptera. La dinámica de la riqueza y abundancia a lo largo del año tuvo picos significativos en el bosque, no observados en la plantación. La estructura trófica fue dominada por saprófagos (75%, depredadores (14% y fitófagos (9%, pero en dos estratos de la plantación de pino (S y O no se dio

  7. Efecto de plantaciones de pino en la artropofauna del suelo de un bosque Altoandino

    Directory of Open Access Journals (Sweden)

    Alba Lucía León-Gamboa

    2010-09-01

    Full Text Available Los artrópodos del suelo son un componente fundamental de los ecosistemas de bosque, ya que participan en la fragmentación de los residuos orgánicos previa a la descomposición. Esta función es más valuable en ambientes de altura, donde las bajas temperaturas limitan la dinámica de los procesos biológicos. Sin embargo, uno de los problemas más comunes en las montañas colombianas ha sido el reemplazo de vegetación nativa por plantaciones de pino. Los efectos sobre los artrópodos del suelo aún son poco conocidos. En un remanente de bosque Altoandino (Embalse del Neusa-Colombia con una plantación adyacente de unos 50 años (aprox. 900 has, fue evaluada la composición, riqueza y abundancia de artrópodos en los estratos superficial (S orgánico (O y mineral (A del suelo, para establecer las diferencias asociadas con la transformación del uso del suelo. Se utilizaron trampas "Pitfall" para registrar el movimiento de fauna epígea, y embudos Berlese para estimar la densidad de fauna de los horizontes O y A. Se calcularon los índices de Shannon y Simpson para estimar la diversidad en diferentes lugares y horizontes, además fue evaluada la estructura trófica de la comunidad. Se recolectaron 38 306 individuos en el bosque y 17 386 en la plantación, principalmente distribuidos en los taxa Collembola, (42.4%, Acari (27%, Diptera (17.6% y Coleoptera (4.6%. Las diferencias más importantes se dieron en la superficie, donde la movilización en bosque (86 individuos/día casi triplicó la movilización en la plantación (33 individuos/día. Las diferencias en la composición se dieron en los taxa Collembola, Araneae, Hemiptera, Homoptera e Hymenoptera. La dinámica de la riqueza y abundancia a lo largo del año tuvo picos significativos en el bosque, no observados en la plantación. La estructura trófica fue dominada por saprófagos (75%, depredadores (14% y fitófagos (9%, pero en dos estratos de la plantación de pino (S y O no se dio

  8. Application of gamma radiation to the nodes detection in Pinus Radiata (D.Don) wood pieces; Aplicacion de la radiacion gamma en la deteccion de nudos en piezas de madera de Pino Radiata (D.Don)

    Energy Technology Data Exchange (ETDEWEB)

    Morales, J R; Dinator, Maria I [Chile Univ., Santiago (Chile). Dept. de Fisica; Karsulovic C, Jose T; Leon G, Adolfo [Chile Univ., Santiago (Chile). Dept. de Tecnologia de la Madera

    1997-12-31

    Attenuation of 59.5 KeV photons provided by an Am-241 source, has been used to detect knots in lumber pieces from Pinus Radiata (D.Don). It is shown that the linear attenuation coefficient is a sensitive parameter to detect singularities in the structure of this material. The scanning of the piece provides profiles which define the position and extension of the singularity. (author). 7 refs.

  9. Influencia de la selecci??n de planta hospedadora, de los parasitoides y de la competencia intraespec??fica en el desarrollo y mortalidad de la procesionaria del pino (Thaumetopoea pityocampa)

    OpenAIRE

    P??rez-Contreras, Tom??s

    2004-01-01

    Se han estudiado diversos aspectos de la ecol??gia de la procesionaria del pino (Thaumetopoea pityocampa), un lepid??ptero heter??cero, de la familia Thaumetopoidaes, que constituye la principal plaga defoliadora de distintas especies de pino en el ??rea mediterranea. El trabajo de campo se realiz?? durante el per??odo 1993-1996, en un pinar de repoblaci??n compuesto por pino de Alepo (pinus halepensis) y pino mar??timo (pinus pinaster), localizado al este de la provincia de Granada. Debido a...

  10. Influencia de la selección de planta hospedadora, de los parasitoides y de la competencia intraespecífica en el desarrollo y mortalidad de la procesionaria del pino (Thaumetopoea pityocampa)

    OpenAIRE

    Pérez-Contreras, Tomás

    2013-01-01

    Se han estudiado diversos aspectos de la ecológia de la procesionaria del pino (Thaumetopoea pityocampa), un lepidóptero heterócero, de la familia Thaumetopoidaes, que constituye la principal plaga defoliadora de distintas especies de pino en el área mediterranea. El trabajo de campo se realizó durante el período 1993-1996, en un pinar de repoblación compuesto por pino de Alepo (pinus halepensis) y pino marítimo (pinus pinaster), localizado al este de la provincia de Granada. Debido a las dif...

  11. Reacción sistémica tras la ingesta de una oruga procesionaria del pino: ¿Manejo conservador?

    OpenAIRE

    Casado Verrier, Esther; Carro Rodríguez, Miguel A; Cancho, María de la Parte; Piñeiro Pérez, Roi

    2016-01-01

    La oruga procesionaria del pino, forma larvaria de la mariposa nocturna Thaumetopoea pityocampa, es una de las principales plagas forestales del sur de Europa. Con frecuencia, estas orugas producen reacciones locales en humanos debidas a los pelillos urticantes microscópicos que las recubren. La mayoría de los síntomas ocasionados son cutáneos, como urticaria aguda, y son mucho más infrecuentes las reacciones sistémicas. Se presenta un caso de reacción sistémica, con edema orofacial, babeo y ...

  12. Prevalencia del maltrato doméstico en adultos mayores. Policlínica "Alcides Pino". Holguín. 2009

    OpenAIRE

    Marcia Avila-Oliva; Libia Avila-Oliva; Sara Iris Rodríguez-Oliva

    2012-01-01

    Se realizó un estudio descriptivo con el objetivo de caracterizar el maltrato doméstico en adultos mayores de dos consultorios del área de salud "Alcides Pino" en el municipio de Holguín en el año 2009. De los seniles que percibieron maltrato estuvieron las edades de 60 a 74 años, predominando el sexo femenino, la escolaridad primaria y las mujeres sin vínculo conyugal, mientras que los mayoritarios estuvieron asociados a hombres casados. Otros aspectos analizados fueron, el tipo de familia o...

  13. VARIABILIDAD GENÉTICA DEL CRECIMIENTO EN PROGENIES SELECTAS DE Pinus radiata

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    Freddy Mora

    2006-09-01

    Full Text Available Heredabilidad en sentido estricto (h2, correlación genética intra-clase (2IC y componentes de varianza para la altura, diámetro a la altura del pecho (DAP y volumen del fuste, a los siete años de edad después de la plantación, fueron analizados en dos ensayos de progenie de Pinus radiata establecidos en el sur de Chile, en orden a examinar la variabilidad genética del crecimiento en una generación avanzada de la especie. Estos ensayos incluyeron árboles provenientes de propagación vegetativa y generativa. Las heredabilidades fueron estimadas para los árboles originados de semillas, y mostraron los siguientes valores: altura, 0.08-0.13; diámetro a la altura del pecho, 0-0.13; volumen del fuste, 0-0.09. Los valores de la correlación genética intra-clase, estimados para el grupo de árboles originados de propagación vegetativa, fueron moderados a bajos (2IC: altura, 0.1-0.11; diámetro a la altura del pecho, 0.01-0.05; volumen del fuste, 0.03-0.06. No obstante la presencia de heredabilidades y correlaciones moderadas para algunas características y, la variación relativamente limitada entre grupos de árboles reflejan la fuerte selección realizada a las progenies. En general, los árboles provenientes de estacas presentaron una tendencia a la menor variación intra-genotípica, y evidenciaron magnitudes relativas de las varianzas debida al grupo (2G mayores a las varianzas familiares (2F, en cuatro de seis caracteres evaluados, indicando una tendencia a la mayor homogeneidad en el crecimiento, característica común de la propagación vegetativa.

  14. Estudio comparativo de la ecología de la procesionaria del pino ("Thaumetopoea pityocampa schiff.") en el Parque Natural de Doñana y P.N. Cazorla Segura y las Villas

    OpenAIRE

    López Pantoja, Gloria; Carrasco Gotarredona, A.

    1997-01-01

    Estimar la diapausa de una zona siempre ha sido uno de los principales problemas en la lucha contra la procesionaria del pino. Los análisis de enterramientos son muy laboriosos y en la mayoría de los casos no ofrecen datos significativos, una forma de estimar este dato podría consistir en estudiar la homogeneidad de una muestra de puestas. En el caso de este trabajo se analiza este parámetro en dos áreas de experimentación, una situada en el Parque Natural de Cazorla Segura y L...

  15. "La población rural de España. De los desequilibrios a la sostenibilidad social", de Luis Camarero (Coord., Fátima Cruz, Manuel González, Julio A. del Pino, Jesús Oliva y Rosario Sampedro

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    Juan Manuel García González

    2013-12-01

    Full Text Available Crítica del libro "La población rural de España. De los desequilibrios a la sostenibilidad social" de Luis Camarero (Coord., Fátima Cruz, Manuel González, Julio A. del Pino, Jesús Oliva y Rosario Sampedro. 2009. Barcelona: Fundación La Caixa, 190 pp.

  16. Francisco Pino: el poeta de los agujeros

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    Esperanza Ortega

    2014-03-01

    Full Text Available La obra de Francisco Pino (1910-2002, en sus dos vertientes, experimental y no-experimental, posee una coherencia absoluta en cuanto a su concepción creacionista, que considera el poema como «manifestación de existencia». En este contexto aparecen en los años setenta sus libros de agujeros troquelados, que son su característica más relevante y constituyen una muestra de osadía artística y rebeldía vital. Estos libros de agujeros, minúsculas maquetas del uni-verso, poseen un sentido metafísico-religioso: Pino representa en ellos el vacío y el silencio consustancial a la poesía como música inaudible y espacio invisible, y nos ofrece los planos de una arquitectura poética que comunica con el infinito por medio de la ventana troquelada. Hay una búsqueda de la palabra poética total en toda su obra, desde sus primeros versos, en los que ya aparecen intuiciones reveladoras de sus hallazgos posteriores. Aunque, para Pino, la poesía es búsqueda constante, persecución de una presa inalcanzable. En esa persecución, hallará los caligramas, los libros troquelados y los poemas visua-les realizados en todo tipo de soportes desechables, pues Pino afirmó siempre su deseo de permanecer en la órbita de lo efímero, ajeno al anhelo de eterni-dad y ajeno también a las convenciones de la Historia del Arte, aunque su postura condenara a su obra al ostracismo o la expusiera a la irrisión. En la ilustración de uno de sus últimos libros, el titulado Tejas: lugar de Dios. Obertura, un pájaro se deshace en el poema. Sin trino ni mensaje posible, el poeta recoge la pluma del pájaro y con ella escribe. Así pues, la poesía surge tras la destrucción del poeta, como consecuencia de su disolución en el texto, una inmolación feliz e inexplicable, que inunda de luz cegadora el poema, iluminándole, sin llegar a desvelar su misterio.

  17. Determinación a través de pruebas aceleradas, de la vida útil del acabado para exteriores en madera de encino y pino

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    R. Flores Velázquez

    2001-01-01

    Full Text Available La madera usada en exteriores requiere de productos que la protejan de la acción de los agentes de intemperismo y en algunos casos mejoren su apariencia. En los acabados que forman película se producen fallas de cohesión entre la madera y la película, terminando con un blanqueo y desprendimiento de ésta por la interacción de la radiación solar y la humedad. En este trabajo se probaron dos barnices poliuretanos de marca comercial para exteriores uno base agua y otro base solvente, aplicados sobre madera de encino y pino, utilizando la rueda de intemperismo acelerado (CTBA de Francia. De acuerdo con el fabricante de los barnices, cuando se alcanza un 10 % de falla en apariencia se requiere dar un rebarnizado. Los datos obtenidos se ajustaron con el modelo no lineal de distribución acumulativa de Weibull, para estimar el tiempo en el cual se alcanza el 10 % de falla ya mencionado. Tomando en cuenta que 2.25 horas de intemperismo acelerado en la rueda equivalen a un día de intemperismo natural bajo condiciones drásticas, se estimaron los tiempos a los cuales se debe aplicar un rebarnizado, siendo de 15.76 días para pino y de 76.21 días para encino cuando se barnizó con Hydroform, mientras que con el barniz 11000 éste fue de 544.26 días para pino y de 381.15 días para encino.

  18. Evaluation of Trichoderma spp. and Clonostachys spp. Strains to Control Fusarium circinatum in Pinus radiata Seedlings Evaluación de Cepas de Trichoderma spp. y Clonostachys spp. para Controlar Fusarium circinatum en Plántulas de Pinus radiata

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    Priscila Moraga-Suazo

    2011-09-01

    Full Text Available The fungus Fusarium circinatum Nirenberg & O’Donnell causes pine pitch canker, an important disease for conifers worldwide. F. circinatum was first detected in Chile in 2001 and to date is present in nurseries and clonal hedges from Libertador General Bernardo O’Higgins Region to Los Rios Region. The purpose of this study was to evaluate the potential of Trichoderma spp. and Clonostachys spp. strains to control F. circinatum in Pinus radiata D. Don seedlings in the absence of other effective control methods. Eighty-one Trichoderma spp. and Clonostachys spp. strains were evaluated through in vitro assays to determine their ability to act as antagonists of F. circinatum and 21 strains were tested for their ability to reduce post-emergence mortality and increase P. radiata survival under greenhouse conditions. During in vitro experiments, 15 strains of Trichoderma inhibited mycelial growth of the pathogen by more than 60% and one strain of Clonostachys showed parasitism of F. circinatum hyphae. Greenhouse experiments showed no control of the disease when the antagonists were added to substrate after the pathogen. However, when the antagonists were added before the pathogen, four strains (Clonostachys UDC-32 and UDC-222 and Trichoderma UDC-23 and UDC-408 reduced post-emergence mortality between 80 and 100%. Among these strains, only Clonostachys UDC-222 significantly increased the survival of P. radiata seedlings. These results showed that Clonostachys UDC-222 has the potential to be used as a biocontrol agent against F. circinatum in the production of P. radiata plants.Fusarium circinatum Nirenberg & O’Donnell es el hongo que causa el cancro resinoso del pino, una enfermedad de importancia mundial en coníferas. En Chile, F. cicirnatum fue detectado por primera vez el año 2001 y a la fecha se encuentra presente en algunos viveros y huertos clonales desde la Región del Libertador General Bernardo O’Higgins hasta la Región de Los R

  19. Estudio comparativo de taninos de tara, mimosa y pino como recurtientes

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    Ricardo Hourdebaigt

    2011-05-01

    Full Text Available Los taninos vegetales son productos naturales que tienen la capacidad de formar complejos con proteínas. Dentro de este contexto, son los productos naturales más importantes usados industrialmente en los procesos que transforman las pieles en cueros. En este proyecto caracterizaremos los taninos utilizados (evaluación de su poder curtiente  y  partiendo de una formulación base en función del artículo final elegido (capellada de calzado, se realiza el curtido e iremos variando el curtiente vegetal y  evaluando  su comportamiento con distintos ensayos.Los taninos evaluados son mimosa, pino radiata y polvo de tara. También presentamos una caracterización de los cueros, mostrando los ensayos a realizar a los diferentes tipos de cuero en función de su uso, las normas que aplican para los análisis y especificaciones que nos orienten para los mismos. Estas especificaciones indican las propiedades que el cuero debe cumplir para que el mismo tenga un  comportamiento adecuado durante su fabricación y uso.AbstractThe vegetable tannins are natural products that are able to form complex with proteins. Within this context, are the most important natural products used in industrial processes that transform raw hides into leathers. In this project we wil characterize the tannins used (evaluation of their power tanning, starting with a basic formulation depending on the final article chosen (upper shoes, the process of tanning is carried out varying the vegetable tannin and evaluating its behaviour with different essays. The evaluated tannins are: mimosa, radiata pine and tare powder. We also present a leather characterization, showing the essays to carry out, the different types of leather depending on its use, the standars used for the analysis and specifications that guide us to them. These specifications indicate the properties that the leather must have to have appropiate behaviour during their manufacture and use.             

  20. Gusano Geometridae [Medidor] de los Pinos

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    Gallego M. F. Luis

    1959-12-01

    Full Text Available Está especie, así como la Noctuitaria y tantas otras congéneres que posiblemente pueden encontrarse entre nosotros, a no dudarlo tendrán mucho que ver con nuestras poblaciones forestales, pero hasta el presente, muy poco o casi nada conocemos de ellas, inclusive sobre sus huéspedes preferidos. La especie de que nos ocupamos es una de las plagas más graves que entre nosotros atacan a los pinos (Cupressus lusitánica v. benttani Mill; sus daños los pudimos apreciar cuando en el mes de marzo del año 1953 apareció en el municipio de Caldas, en un pinar de unas 10 0 12 cuadras de extensión, que fue destruido en un lapso de no poco menos de dos años, debido a que su dueño no hizo esfuerzo para ver de lograr su destrucción, cuando los daños del insecto se iniciaban, lo que hubiera sido más fácil y posible.

  1. Mineralización del nitrógeno, carbono y actividad enzimática del suelo en un bosque de Nothofagus obliqua (Mirb Oerst y una plantación de Pinus radiata D. Don. del centro-sur de Chile Nitrogen and carbon mineralization and enzyme activity in soils of Nothofagus obliqua (Mirb Oerst stands and Pinus radiata D. Don plantation in south-central Chile

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    YESSICA RIVAS

    2009-03-01

    Full Text Available En Chile, el establecimiento de plantaciones comerciales de rápido crecimiento ha sido sostenido en las últimas décadas mediante la sustitución de bosques nativos y conversión de suelos agrícolas. Pinus radiata D. Don es la principal especie productiva, debido a su crecimiento acelerado y adaptabilidad al clima y los suelos. En el presente estudio se plantea que la actividad biológica del suelo es variable a través del año, en respuesta a variaciones de precipitación, temperatura y contenido de humedad de suelo y que el cambio de uso de suelo desde un bosque templado de Nothofagus obliqua (Mirb Oerst a una plantación con coniferas exóticas, modifica la química del suelo y consecuentemente los procesos de N-min, C-min y la actividad biológica del suelo. Esta hipótesis fue examinada en un bosque de N. obliqua y una plantación de P. radiata del centro-sur de Chile (40°07' S, 72° O. Se evaluó mensualmente la tasa mineralización de nitrógeno (N-min, cabono (C-min y la actividad enzimática potencial del suelo (ureasa, proteasa e hidrólisis de la fluoresceína diacetato entre septiembre 2003 y mayo 2005. Los resultados demuestran que los niveles de las variables de actividad biológica del suelo fueron significativamente diferentes entre las parcelas de bosque y plantación (Lambda de Wilk = 0,022; F 5,80 = 733; P In Chile, commercial forests plantations have increased during the last decades due in part to replacement of native forests and conversion of agricultural soils. Pinus radiata D. Don has been the main tree planted, due to its rapid growth and adaptability. In the present study we proposed that biological activity varies along the year due to changes of precipitation, temperature and soil water content and mainly because the conversion of native forest to exotic P. radiata plantations alters the soil chemistry, N and C mineralization and the potential enzymatic activity in these soils. This hypothesis was examined in a

  2. Red Dendrocronológica del Pino de Altura (Pinus hartwegii Lindl. para estudios dendroclimáticos en México

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    Lorenzo Vázquez Selem

    2014-01-01

    Full Text Available El bosque de Pinus hartwegii constituye el límite superior arbóreo en las montañas de México. En este estudio se desarrolló una red de cronologías de esta especie, localizadas en volcanes del Eje Neovolcánico Transversal, en el centro del país, y picos elevados de la Sierra Madre Oriental, en el Noreste. El Análisis de Componentes Principales integró las cronologías en dos grupos, uno para el centro y otro para el Noreste, con los que se desarrollaron dos cronologías regionales de 320 años (1690-2009 y 590 años (1420-2009, respectivamente. El fenómeno de El Niño Oscilación del Sur (ENSO en su fase cálida (El Niño y fría (La Niña, mostró un impacto significativo en el comportamiento de la variabilidad hidroclimática descrita por ambas series. La Niña produjo condiciones climáticas contrastantes, es decir, secas en el Noreste y húmedas en el centro, mientras que la fase de El Niño originó sequías en ambas regiones, pero sólo durante eventos intensos de ENSO.

  3. Arcos con madera laminada del Pino Caribe Venezolano. Una propuesta para procesos de arquitectura ecosustentable - Arches with Venezuelan Caribbean Pine´S laminated wood. A proposal for eco-sustainable architecture processes

    Directory of Open Access Journals (Sweden)

    Rafael Gerardo Páez

    2017-07-01

    Full Text Available El principio generador de la madera laminada establece que piezas aserradas, débiles y pequeñas, al unirse con adhesivos artificiales, conforman elementos más grandes, con propiedades físico-mecánicas superiores a las de la misma especie maderable. En esta investigación se analiza la aplicación de la madera laminada del Pinus caribaea Morelet, var. hondurensis; cultivado en la Orinoquia venezolana, para fabricar sistemas estáticos curvos, dentro de procedimientos edificatorios en construcciones ecológicas y sustentables. El objetivo general propone definir un modelo estructural de arcos que simplifique las labores de producción, transporte, pre-ensamblado, montaje, aprovechamiento, transformabilidad, deconstrucción y reciclaje; que justifique los principios de desarrollo tecnológico ecosustentable basados en las innovaciones tecnológicas de la madera laminada de pino Caribe. La metodología empleada permitió analizar comparativamente y describir los predimensionamientos del peralte de distintos componentes estructurales portantes, que responden eficientemente a esfuerzos de flexo-compresión, configurados a partir de los diagramas de momentos flexionantes de vigas rectas simplemente apoyadas y empotradas y son geométricamente análogos a sistemas de arcos bi o triarticulados. Entre las conclusiones se determina que la arquitectura ecosustentable queda definida como el conjunto de medidas que aportan soluciones constructivas que no dañan el medio ambiente; que emplea, además, materiales naturales renovables, respeta los ecosistemas, construye sin desperdicios; que deconstruye y recicla, sin demoler ni generar escombros. Este artículo queda incluido en la línea de Investigación: Innovación Tecnológica como Proceso; sub-línea: Asimilación y Dominio Tecnológico; Postgrado de Gestión de Investigación y Desarrollo - Facultad de Ciencias Económicas y Sociales de la Universidad Central de Venezuela. Abstract The main

  4. Clareo con selección de árboles de porvenir sobre regenerado post-incendio de elevada densidad de pino carrasco en el Parque Regional del Sureste.

    OpenAIRE

    Orduña Rubio, Berta

    2017-01-01

    Se presenta una experiencia sobre una masa de pino carrasco de 10 años de edad y elevada densidad (más de 10.000 pies/ha), en estado de monte bravo a bajo latizal, originada tras un incendio ocurrido en una repoblación (monte “Casa Eulogio”; Rivas-Vaciamadrid, Madrid). Se seleccionaron 400 pies/ha de porvenir, apeándose todos los pies vecinos en un radio de 1 ó 2 m para favorecer su desarrollo. Todo ello, en un contexto de restricciones económicas que obliga a buscar fórmulas que optimicen el...

  5. Micrometeorología de masas forestales de pino silvestre (Pinus sylvestris L.) y rebollo (Quercus pyrenaica Willd.) en la vertiente norte del Sistema Central (Montes de Valsaín, Segovia). Consecuencias selvícolas

    OpenAIRE

    Gómez Sanz, Valentín

    2011-01-01

    La Tesis trata sobre el estudio y evaluación de los patrones microescálicos de variabilidad, tanto espacial como temporal, que bajo diferentes cubiertas forestales de pino silvestre (Pinus sylvestris L.) y rebollo (Quercus pyrenaica Wild.), presentan las variables de estado de uso más frecuente en la caracterización de] sistema atmósfera-superficie terrestre. Se ha buscado con ello analizar cualitativa y cuantitativamente el efecto modificador que, sobre la respuesta micrometereológica bajo e...

  6. Longevidad y anillos de crecimiento en el Pino de la Virgen (El Paso, La Palma

    Directory of Open Access Journals (Sweden)

    María del Mar Génova Fuester

    2013-11-01

    Full Text Available En el seno del proyecto de investigación que se está desarrollando en Canarias orientado a la reconstrucción de la variabilidad climática del Archipiélago a lo largo del último milenio a partir de la información climática contenida en los anillos de crecimiento de ejemplares de pino canario, uno de los árboles estudiados ha sido el célebre Pino de la Virgen de El Paso, La Palma. Su alto valor simbólico y cultural ha llevado a un análisis más detenido, centrado en la aplicación de técnicas específicas para la estimación de su edad.Within the framework of the investigation wich is being developed in the Canary Islans for the reconstruction of the last millennium climatic variability in the Archipelago from the climatic information recorded in canary pine tree-rings, one of the analized trees has been the renowed Pino de La VIrgen de El Paso, La Palma. Its high simbolic and cultural value deserved the application of specific techniques for the estimation of its age. 

  7. CARACTERÍSTICAS FÍSICAS DE LA MADERA DE PINO PROCEDENTE DE RALEOS EN EL NOROESTE DE ESPAÑA

    OpenAIRE

    Riesco Muñoz,G; Díaz González,J

    2007-01-01

    Se estudió la densidad, contracción, higroscopicidad y punto de saturación de la pared celular en la madera de ejemplares jóvenes de tres especies importantes en la producción maderera española: Pinus pinaster, Pinus sylvestris y Pinus radiata. Se muestrearon 29 pinos procedentes de raleos efectuados en diferentes masas forestales de Galicia (noroeste de España). El material de ensayo fueron probetas de pequeñas dimensiones sin defectos. La madera de Pinus pinaster resultó semipesada y más in...

  8. Animazione di un’armatura. Il cavaliere inesistente di Italo Calvino e Pino Zac Animation of Armor. The Nonexistent Knight by Italo Calvino and Pino Zac

    Directory of Open Access Journals (Sweden)

    Pier Paolo Argiolas

    2012-12-01

    Full Text Available Pino Zac, eclettico regista e disegnatore, è autore dell’omonimo adattamento cinematografico del romanzo parodico medievale Il cavaliere inesistente di Italo Calvino, realizzato dal regista con tecnica mista – attori e disegni animati. Il valore intrinseco dei testi in esame permette un’analisi comparativa che coinvolga al contempo la specifica grammatica del medium adoperato e fondamentali questioni interpretative, evitando il rischio di ridurre il confronto alla misurazione meccanica di differenze e invarianti nel passaggio da un codice all’altro. La traduzione intersemiotica tra sistema letterario e sistema filmico pone l’autore dinanzi a scelte di natura formale, etica ed estetica che oscillano tra il rispetto del codice genetico del testo-fonte e la coerenza del proprio processo riscrittorio; questo andamento bidirezionale permette nei casi migliori, come questo, di penetrare ancora più in profondità i lati più in ombra del testo originale, attraverso una nuova versione del medesimo dotata di indubbio valore critico.Pino Zac, eclectic director and designer, is the author of the eponymous film adaptation of the novel parodic medieval The Nonexistent Knight by Italo Calvino, made ​​by the director with mixed media - actors and cartoons. The intrinsic value of these texts allows a comparative analysis involving at the same time the specific grammar of the medium used and fundamental questions of interpretation, avoiding the risk of reducing the comparison to the measurement of mechanical differences and invariant in the transition from one code to another. Intersemiotic translation system between literary and filmic system places the author in front of choices of a formal nature, ethics and aesthetics ranging from compliance with the genetic code of the source text and the cohesion of its rewriting process, this allows two way in cases best, like this, to penetrate more deeply into the sides in the shade of the original text

  9. The poetics of Francisco Pino, rare avis in Spanish poetry

    NARCIS (Netherlands)

    Hermans, Hub.

    Francisco Pino (1910-2002) can be considered as a "rara avis" in Spanish poetry. Having published dozens of books rather anonymously, and generally with small private presses, he began publishing through more renowned publishing companies in 1978. His various new editions, anthologies and editions

  10. Arcos con madera laminada del Pino Caribe Venezolano. Una propuesta para procesos de arquitectura ecosustentable - Arches with Venezuelan Caribbean Pine´S laminated wood. A proposal for eco-sustainable architecture processes

    OpenAIRE

    Rafael Gerardo Páez

    2017-01-01

    El principio generador de la madera laminada establece que piezas aserradas, débiles y pequeñas, al unirse con adhesivos artificiales, conforman elementos más grandes, con propiedades físico-mecánicas superiores a las de la misma especie maderable. En esta investigación se analiza la aplicación de la madera laminada del Pinus caribaea Morelet, var. hondurensis; cultivado en la Orinoquia venezolana, para fabricar sistemas estáticos curvos, dentro de procedimientos edificatorios en construccion...

  11. Procedencia y uso de madera de pino silvestre y pino laricio en edificios históricos de Castilla y Andalucía

    Directory of Open Access Journals (Sweden)

    Rodríguez Trobajo, Eduardo

    2008-12-01

    Full Text Available The productive cycle of Scots pine (Pinus sylvestris L. and black pine (Pinus nigra Arn. within the medieval Castilian and Andalusian carpentry is here analysed. New criteria to identify both timbers and its dendrochronological date are shown as previous facts to determine their geographical origin. Historical names of these species and other names, such as alerce, with a vague allocation are also studied. Main historical areas of resource and river ways of Tajo and Guadalquivir used to transport the wood (black pine to interior cities (Sevilla, Toledo, Madrid … are thus identified. On the other hand, wood’s diversification and its selective use is analysed regarding its resistance value. Availability also determines that a sort of wood becomes fossil-guide (especie-guía, which is proposed as chronological indicator for several periods and constructive contexts. Some timber remains dating to the first millennium are studied in detail. They belong to the Mosque of Cordoba and four early medieval churches sited in the Duero valley (La Nave, Baños, Quintanilla and Barriosuso. The empiric dating and analysis of this material offer a post quem chronology for the building of these churches and new facts about the distribution of theses wood’s species in the north-western Iberian peninsula.Se realiza un recorrido a través del ciclo constructivo de las maderas de pino silvestre (Pinus sylvestris L. y pino laricio (Pinus nigra Arn. en el ámbito de la carpintería medieval de Castilla y Andalucía. Nuevos criterios para diferenciar las dos especies de madera y su datación dendrocronológica, son aportados como datos previos para determinar el origen geográfico del material. Son objeto de discusión los nombres históricos de estas especies y otras voces, como alerce, que tienen una imprecisa asignación. Se identifican así las principales áreas históricas de aprovechamiento y las vías fluviales del Tajo y Guadalquivir utilizadas para el

  12. Fraccionamiento de aserrín de pino destinado a una biorrefinería forestal

    OpenAIRE

    Stoffel, Romina

    2016-01-01

    El cuidado del medio ambiente se ha transformado en un factor que agrega valor a la producción industrial, haciéndola más competitiva mediante la utilización de recursos renovables y tecnologías avanzadas. La biorrefinería forestal procesa biomasa lignocelulósica proveniente de la industrialización de la madera (aserrín, viruta, trozos de madera) para producir energía, productos químicos y biomateriales, en forma similar a las refinerías de petróleo. El aserrín de pino y eucalipto es uno de l...

  13. Pistola Finca Pinos: ferramenta ou arma de fogo?

    Directory of Open Access Journals (Sweden)

    Rodrigo Grazinoli Garrido

    2017-06-01

    Full Text Available O artigo pretende analisar a possibilidade de uso da ferramenta denominada “pistola finca pinos”, utilizada na construção civil, como arma de fogo na execução de crimes contra a vida. Serão examinados os tipos, as características e o mecanismo de funcionamento da pistola finca pinos e munição associada, em comparação às características da arma de fogo, com o objetivo de avaliar sua possível aplicação na prática de crime. Serão verificadas as normas regulamentadoras da venda e manuseio dessa ferramenta, assim como a análise de alguns casos de mortes decorrentes do uso da pistola finca pinos e a diagnose diferencial conferida a cada caso: homicídio, suicídio ou acidente.

  14. Influencia del deterioro incipiente producido por el hongo de pudrición parda Serpula lacrymans, sobre las propiedades mecánicas de compresión normal y paralela a la fibra en madera de Pinus radiata D. Don

    Directory of Open Access Journals (Sweden)

    Pereira, A.

    2011-03-01

    Full Text Available Several buildings and structures of wood are attacked by rot fungi, leading in some cases, slight weight losses that result in reductions in the strength properties of the material. In this work was evaluated the influence of early rot decay in wood, in mechanical properties of normal and parallel compression. For this, were inoculated samples of Pinus radiata D. Don with brown rot fungi Serpula Lacrymans. These samples were tested in three differents periods of fungal exposure. The results identified a significant decrease in percentage of the properties under study.Diversas edificaciones y estructuras construidas en madera son atacadas por hongos de pudrición, provocando en algunos casos, leves pérdidas de peso que se traducen en disminución en las propiedades resistentes del material. En este trabajo se evaluó la influencia de estados incipientes de pudrición en madera, en las propiedades mecánicas de compresión paralela y compresión normal. Para esto, se inocularon probetas de Pinus radiata D. Don. con el hongo de pudrición parda Serpula lacrymans, las cuales fueron posteriormente ensayadas mecánicamente en tres diferentes períodos de exposición fúngica. Los resultados obtenidos determinaron una importante disminución porcentual de las propiedades bajo estudio.

  15. From the burgh of Pino to the town of Monforte in the land of Lemos (12th-13th centuries

    Directory of Open Access Journals (Sweden)

    Luis Manuel Ibáñez Beltrán

    2017-09-01

    Full Text Available The land of Lemos, in the south of the province of Lugo, has undergone a long process of evolution, from the pre-Roman culture of Lemavos to today’s world. In this evolution the land of Lemos has adapted to different realities and historic moments. The High Middle Ages represent a particularly important time during this period, bearing witness to the foundation of the burg of Pino and then the town of Monforte, the new headquarter of the area. This new urban space sees a land that is markedly rural and agrarian meet a new morphological, economic and social reality. At the same time, Lemos also welcomes a new kind of authority, the council of Monforte. This council then joins with two other local powers, the Benedictine monastery of San Vicente del Pino and the secular nobility of Lemos County, the most important noble family in the Late Middle Ages in Galicia. The three powers together, in constant clashes, define the structure and dynamic of this new town, a town on which the crown exerts a certain kind of power balance, influencing it in one direction or the other with concessions and grants.

  16. Male sterile mutant in Vigna radiata

    International Nuclear Information System (INIS)

    Pande, Kalpana; Raghuvanshi, S.S.

    1987-01-01

    Single and combined treatment of γ-rays and 0.25 per cent EMS were tried on Vigna radiata variety K851. A male sterile mutant was isolated in M 2 generation. Experiments indicated male sterility to be recessive and monogenic in nature. 6 figures. (author)

  17. Rendimiento hídrico en cuencas primarias bajo pastizales y plantaciones de pino de las sierras de Córdoba (Argentina)

    OpenAIRE

    Jobbagy Gampel, Esteban Gabriel; Acosta, Ana Mariel; Nosetto, Marcelo Daniel

    2016-01-01

    Los cambios en la cobertura vegetal pueden tener importantes efectos sobre el ciclo hidrológico, afectando la magnitud y distribución temporal del caudal de ríos y arroyos. Estos efectos cobran una relevancia especial en áreas montañosas de regiones secas dado su papel importante en la provisión de agua. Este es el caso de las laderas orientales de las sierras de Córdoba, en donde se establecieron ~35000 ha de plantaciones de pinos en reemplazo de pastizales naturales. Exploramos cómo esta tr...

  18. Bioactive phenolic acids from Scorzonera radiata Fisch.

    Directory of Open Access Journals (Sweden)

    N Tsevegsuren

    2014-09-01

    Full Text Available Chromatographic separation of the crude extract obtained from the aerial parts of the Mongolian medicinal plant Scorzonera radiata yielded five new dihydrostilbenes [4], two new flavonoids, one new quinic acid derivative, as well as twenty known compounds including eight quinic acid derivatives, four flavonoids, two coumarins, five simple benzoic acids, and one monoterpene glycoside. We present here results on isolation and structural identification some active phenolic compounds from the Scorzonera radiata - eight quinic acid derivatives (quinic acid, 4,5-dicaffeoylquinic acid, 4,5-dicaffeoyl-epi-quinic acid, 3,5-dicaffeoylquinic acid, 3,5-dicaffeoyl-epi-quinic acid, chlorogenic acid, 5-p-coumaroylquinic acid (trans, 5-p-coumaroylquinic acid (cis. Quinic acid derivatives exhibited antioxidative activity.DOI: http://dx.doi.org/10.5564/mjc.v12i0.177 Mongolian Journal of Chemistry Vol.12 2011: 78-84

  19. Defect core detection in radiata pine logs

    International Nuclear Information System (INIS)

    Wallace, G.

    1993-01-01

    Internal defect cores in Pinus radiata logs arise primarily from the practice in New Zealand of pruning trees to increase the amount of clear wood. Realising the benefits of this practice when milling the logs is hampered by the lack of a practical method for detecting the defect cores. This report attempts to establish industry requirements for detections and examine techniques which may be suitable. Some trials of a novel technique are described. (author) 19 refs.; 11 figs

  20. Estudio del efecto de la dirección de medición y contenido de humedad en la velocidad de ultrasonido en madera de Pinus radiata D. Don a través de análisis de varianza

    Directory of Open Access Journals (Sweden)

    Rodrigo Ortíz Mansilla

    2009-09-01

    Full Text Available Para analizar la técnica de ultrasonido como una alternativa en la evaluación del estado estructural de diferentes edificaciones construidas en madera, se estudió el efecto e importancia relativa de la dirección de medición y el contenido de humedad, so- bre la velocidad de transmisión en este material. Para esto, se aplicaron pulsos longitudinales ultrasónicos de 1 Mhz sobre pro- betas de madera de Pinus radiata D. Don, bajo un procedimiento experimental que consideró la utilización de un diseño fac- torial 22 completamente aleatorizado. Como resultado del análisis de varianza, se determinó que dentro de los rangos de con- tenido de humedad y dirección de medición estudiados, este último se presenta como factor significativo, explicando el 95% de la variabilidad total observada. De hecho, la variación del contenido de humedad entre 0 y 15%, conlleva a valores de veloci- dad de propagación promedio de 1.644 m/s y 2.130 m/s para las direcciones tangencial y radial, respectivamente. Los resulta- dos de este trabajo permiten concluir que al momento de realizar una evaluación mediante ultrasonido en estructuras en servi- cio, principalmente se debe considerar la dirección de medición como un factor determinante en el estudio; sin embargo, la e- fectividad de aplicación de esta técnica requiere de otros trabajos complementarios que consideren la propagación en planos mixtos de la madera. Este estudio se llevará a cabo próximamente.

  1. Comparación de la eficacia del ácido fórmico y del fluvalinato, como métodos de control de Varroa destructor (Acari: Varroidae en colmenas de Apis mellifera (Hymenoptera: Apidae, en Ñuble, centro sur de Chile

    Directory of Open Access Journals (Sweden)

    Daniel GONZÁLEZ-ACUÑA

    2005-01-01

    Full Text Available Durante la primavera de 2000, se comparó la eficacia del ácido fórmico al 85 % y del fluvalinato como acaricidas contra Varroa destructor Anderson y Trueman en colmenas de Apis mellifera L., ubicadas en el Campus Chillán de la Universidad de Concepción (36o36‘S 72o0,6 ́W. Se formaron tres grupos de diez colmenas. El grupo 1 fue tratado con ácido fórmico al 85% aplicado en Vaporizadores Universales MHT ®; el grupo 2 se utilizó como con- trol, sin recibir ningún tipo de tratamiento; el grupo 3, se trató con tablillas de pino (Pinus radiata impregnadas en fluvalinato al 3 %. Al finalizar la aplicación de los acaricidas en estudio, las colmenas de los tres grupos fueron sometidas a un tratamiento testigo con Bayvarol® (flumetrín. La mayor eficacia se reportó en el grupo tratado con fluvalinato arrojando un promedio de 98,05 ± 2,13 %. De la misma manera con ácido fórmico se obtuvo una eficacia promedio de 88,26 ± 9,12 %, mientras que en el grupo control la mortalidad natural en promedio fue de 41,11 ± 11,52 %.

  2. Comparative nutritional analysis between Vigna radiata and Vigna ...

    African Journals Online (AJOL)

    Vigna radiata (mung bean) and Vigna mungo (mash bean) of the family Fabaceae are among staple food in Pakistan. The experiments were conducted on these beans to determine the proximate composition such as moisture, ash, fibre, fat and protein content. The protein isolates from V. radiata and V. mungo was ...

  3. DETERMINACIÓN DE MEDIOS DE CULTIVO Y PH PARA LA MASIFICACIÓN in vitro DE CEPAS DE Suillus luteus Aubl. ASOCIADAS A Pinus radiata D. Don Y Scleroderma citrinum Pers. ASOCIADAS A Eucalyptus globulus Labill. DE LA REGIÓN DEL BIOBÍO, CHILE

    Directory of Open Access Journals (Sweden)

    Marta González

    2015-02-01

    Full Text Available El uso de agentes biológicos en la producción en vivero ha aflorado como un elemento que permite no sólo mejorar la calidad morfológica y fisiológica de las plantas, sino que también posibilitar un mayor éxito en el ámbito silvicultural de una plantación. Estos agentes biológicos requieren de un ambiente óptimo para crecer, asociarse y reproducirse. El objetivo de este estudio fue determinar la dependencia del pH y el medio de cultivo en el crecimiento in vitro de distintas cepas de Suillus luteus y Scleroderma citrinum asociadas a Pinus radiata y Eucalyptus globulus, respectivamente. El estudio se realizó en condiciones controladas de temperatura y humedad, disponiendo los inóculos en placas Petri con diferentes medios cultivo, evaluando parámetros de crecimiento y biomasa a los 38 días para S. luteus y 105 días para S. citrinum. Los resultados indican que tanto el medio de cultivo, el pH del medio, así como las cepas de cada especie estudiada, son determinantes en las respuestas de crecimiento de los hongos ectomicorrícicos in vitro evaluados. Las cepas de S. luteus se desarrollaron adecuadamente en un medio de cultivo con abundancia de nutrientes (BAF, MMN como en baja presencia de ellos (EMA, y con pH más bien ácido (4,8 y 5,8. Por otro lado, las cepas de S. citrinum presentaron, para los mismos ambientes, un desarrollo inferior y lento, no obstante, la cepa Sc8 se reprodujo de forma óptima y rápida bajo un medio de cultivo BAF y con un pH moderadamente ácido de 5,8.

  4. La corona radiata de Helios-Sol como símbolo de poder en la Cultura Visual Romana

    Directory of Open Access Journals (Sweden)

    Jorge Tomás García

    2017-12-01

    Full Text Available El presente trabajo pretende analizar la presencia del motivo iconográfico de la corona radiata en la cultura visual romana como símbolo de poder. Para ello, analizaremos la figura mitológica de Helios, y sus múltiples variantes en las fuentes clásicas, especialmente aquellas que más la relacionan con la divinidad del Sol en el mundo romano. Las principales categorías de interpretación de la iconografía del Sol en la cultura visual romana enriquecen las variantes iconológicas de la presencia de la corona radiata. Así, pretendemos analizar la naturaleza real o simbólica de este atributo iconográfico tan presente desde la época de Augusto como símbolo de poder y luz ligado a la realía imperial. This article aims to analyze the presence of the iconographic motif of the corona radiata in the Roman visual culture as a symbol of power. For this, we will analyze the mythological figure of Helios, and its multiple variants in the classical sources, especially those that relate more to the divinity of the Sun in the Roman world. e main categories of interpretation of the Sun's iconography in the Roman visual culture enrich the iconological variants of the presence of the corona radiata. us, we intend to analyze the real or symbolic nature of this iconographic attribute so present since the time of Augustus as a symbol of power and light linked to the imperial realia.

  5. COMPARACIÓN DE TÉCNICAS DE ESTIMACIÓN DE VOLUMEN FUSTAL TOTAL PARA CINCO ESPECIES DE PINO DE DURANGO, MÉXICO

    Directory of Open Access Journals (Sweden)

    S. Corral-Rivas

    2009-01-01

    Full Text Available En este estudio se compararon diez técnicas de cubicación de volumen fustal total sin corteza para cinco especies de pino en Durango, México. El volumen de cada árbol se estimó con las ecuaciones convencionales de: 1 Smalian, 2 Newton y 3 Sólidos de revolución y con los modelos de ahusamiento 4 Amidon, 5 Biging, 6 Clutter, 7 Kozak 1, 8 Kozak 2, 9 Newnham y 10 Rustagi y Loveless. Los modelos convencionales de: a Schumacher y Hall, b Spurr, c Spurr transformado, d Honer, e Sloboda, f Naslund y g Australiana se ajustaron a los volúmenes estimados por las técnicas descritas con el uso de las variables independientes diámetro normal y altura total. Los modelos de volumen fueron comparados por medio de un análisis de covarianza con la finalidad de utilizar aquellos comparables con la estimación del volumen por la ecuación convencional de Smalian. Los resultados mostraron que las ecuaciones de ahusamiento de Amidon y Biging proveen volúmenes comparables al nivel del árbol o del rodal con los generados por las ecuaciones de volumen convencionales que se alimentan con el volumen estimado por la ecuación de Smalian, de Huber o de Newton. Por esta razón, los dos modelos se recomiendan para estimar los volúmenes totales ycomerciales de las cinco especies de pino de Durango, México.

  6. DETERMINAÇÃO EXPERIMENTAL DA DENSIDADE VOLUMÉTRICA MÉDIA DE ENERGIA EM PINOS ENDODÔNTICOS TRANSLÚCIDOS

    OpenAIRE

    FERNANDO CAMILOTTI

    2016-01-01

    O uso de pinos endodônticos em restaurações de dentes tem sido muito frequente. Estes pinos são formados, em geral, por fibras de vidro envolvidas e compactadas em epóxi, possuindo um formato cônico. Estudos de microscopia foram realizados para investigar a estrutura de quatro modelos de pinos de fibra de vidro do fabricante FGM (modelos DC 0.5, DC1, DC2 e DC3), e constatou-se falta de homogeneidade. Os modelos de pinos usados neste trabalho são transparentes e, no uso clínico, são cimentados...

  7. Biocontrol of Fusarium circinatum Infection of Young Pinus radiata Trees

    Directory of Open Access Journals (Sweden)

    Eugenia Iturritxa

    2017-01-01

    Full Text Available Pitch canker, caused by the fungus Fusarium circinatum, is a major disease of Pinus radiata currently controlled to some extent in nurseries by good hygiene and application of synthetic fungicides. The aim of this study was to evaluate alternative strategies to control fungal infections in nurseries and young pine plantations. The antagonistic effects of biocontrol bacteria and essential oils against F. circinatum in vitro and in young P. radiata trees were assessed. Pseudomonas fluorescens, Erwinia billingiae, and Bacillus simplex reduced the growth of the fungus in vitro by 17%–29%, and decreased the density of the mycelial mat. In young P. radiata trees, the length of F. circinatum lesions was reduced by 22%–25% by the same bacterial strains. Direct application of cinnamon and/or clove essential oils to wounds in stems of two-year-old P. radiata trees also limited the damage caused by F. circinatum. Lesion length was reduced by 51% following treatment with cinnamon oil (10% v/v, and by 45% following treatment with clove oil (15% v/v or a combination of both oils. However, the oils were toxic to younger trees. The biocontrol bacteria and essential oils show promise as prophylactic treatments to reduce the devastating effects of F. circinatum on P. radiata.

  8. Comparative genetic structure in pines: evolutionary and conservation consequences Estructura genética comparada en pinos: consecuencias evolutivas y para la conservación

    Directory of Open Access Journals (Sweden)

    PATRICIA DELGADO

    2002-03-01

    historia evolutiva. Con estos antecedentes estudiamos comparativamente la estructura genética de pinos. La heterocigosis esperada es particularmente constante con límites de confianza al 99 % entre 0,19 y 0,23 en las especies que se han estudiado hasta ahora utilizando aloenzimas. Hay una proporción significativa de especies (9/41 que muestran estimados de diferenciación altos (Fst = o mayor que 0,15. De ellos cinco especies tienen semillas grandes y sin alas asociadas probablemente con bajas densidades, dispersión de semillas por aves y resistencia a sequía. Estas especies incluyen a los pinos piñoneros de Norteamérica. Las tasas de entrecruzamiento también son constantes entre especies tanto del subgénero Pinus como del subgénero Strobus que refleja probablemente un límite selectivo a la cantidad de alelos deletéreos que pueden ser mantenidos en las poblaciones y que afecta también el nivel de consanguinidad. También exploramos los datos publicados usando microsatélites en pinos, concluyendo que estos marcadores muestran una mayor cantidad de variación y diferenciación genética como es esperado y que los modelos de evolución molecular utilizados para derivar los estimadores de la estructura genética de la población deben de tomar en consideración otras fuentes de mutación (mutaciones puntuales, inserciones y deleciones de mayor tamaño y la existencia de duplicaciones para entender las aplicaciones que desde el punto de vista comparado se pueden hacer con este tipo de marcadores

  9. Selection and evaluation of Rhizobial strains of Vigna radiata L ...

    African Journals Online (AJOL)

    STORAGESEVER

    2008-10-20

    Oct 20, 2008 ... Selection and evaluation of Rhizobial strains of Vigna radiata L. beneficial to ... This study aimed to select suitable strains that can be used as inoculants to enhance legume production and simultaneously reduce the use of ... contributor to natural or biological N2 fixation and allows legumes to grow in the ...

  10. Improvement of real pine (Pinus montezumae Lamb). Part I; Mejoramiento del pino real. Parte I

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez J, J; Jimenez C, M; Garcia T, M A [Instituto Nacional de Investigaciones Nucleares, Laboratorio de Genetica Vegetal, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2000-07-01

    The real pine is an endemic specie of Mexico which is actually in danger of extinction. So the gamma radiation can accelerate the development of some vegetal species, then it is proceeded to find the radiation dose which allows to break the disease condition to diminish the lethargy time of those seeds with a dose range of 1 to 300 Krad of gamma radiation. It is required to realize more tests and observing in a greater period the hipocotile emission to determine the dose which allow to break the condition permanently. (Author)

  11. Descomposición de hojarasca de Pinus radiata y tres especies arbóreas nativas Decomposition of leaf litter of Pinus radiata and three native tree species

    Directory of Open Access Journals (Sweden)

    CHRISTOPHER H. LUSK

    2001-09-01

    Full Text Available En el centro-sur de Chile, las últimas décadas han sido testigo de una conversión masiva de bosques, matorrales y tierras agrícolas a plantaciones de árboles exóticos. Aunque se ha estudiado la influencia de dichos cambios sobre el balance hídrico, los posibles efectos sobre otros procesos ecosistémicos han recibido poca atención. En esta breve comunicación se presentan datos de un estudio de la descomposición de hojarasca de Pinus radiata y tres especies arbóreas nativas, llevado a cabo con el fin de explorar los posibles efectos del reemplazo de bosque nativo por plantaciones exóticas sobre el ciclaje de nutrientes. Se incubaron muestras de las cuatro especies en dos ambientes distintos en sitios colindantes: bajo un bosque nativo secundario, y bajo un rodal de P. radiata. Se registró la pérdida de peso seco después de dos meses y seis meses. Las tasas diarias de descomposición fueron mucho mayores durante los primeros dos meses de incubación que durante los cuatro meses subsiguientes. En ambas fechas hubo diferencias significativas entre las especies y entre los sitios: todas las especies presentaron mayores tasas de descomposición bajo P. radiata que bajo el bosque nativo. No hubo evidencia de interacción entre sitio y especie. Después de seis meses, el orden de pérdida de peso seco fue Nothofagus obliqua > P. radiata > Peumus boldus > Cryptocarya alba. La variación interespecífica en la tasa de descomposición presentó más relación con el área foliar específica que con el contenido de nitrógeno en la hojarasca. Dado que la hojarasca de P. radiata se descompuso más lentamente que la de la especie caducifolia N. obliqua, pero más rápidamente que las especies esclerófilas, los efectos de la sustitución o invasión sobre descomposición dependerían de la composición original del bosque nativo en cuestiónRecent decades have seen widespread conversion of native forests, shrublands and farmland in south

  12. SRTM Perspective View with Landsat Overlay: Mt. Pinos and San Joaquin Valley, California

    Science.gov (United States)

    2000-01-01

    Ask any astronomer where the best stargazing site in Southern California is, and chances are they'll say Mt. Pinos. In this perspective view generated from SRTM elevation data the snow-capped peak is seen rising to an elevation of 2,692 meters (8,831 feet), in stark contrast to the flat agricultural fields of the San Joaquin valley seen in the foreground. Below the summit, but still well away from city lights, the Mt. Pinos parking lot at 2,468 meters (8,100 feet) is a popular viewing area for both amateur and professional astronomers and astro-photographers. For visualization purposes, topographic heights displayed in this image are exaggerated two times.The elevation data used in this image was acquired by SRTM aboard the Space Shuttle Endeavour, launched on February 11, 2000. SRTM used the same radar instrument that comprised the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) that flew twice on Endeavour in 1994. SRTM was designed to collect three-dimensional measurements of Earth's land surface. To collect the 3-D SRTM data, engineers added a mast 60 meters (about 200 feet)long, installed additional C-band and X-band antennas, and improved tracking and navigation devices. The mission is a cooperative project between the NASA, the National Imagery and Mapping Agency (NIMA) of the U.S. Department of Defense, and the German and Italian space agencies. It is managed by NASA's Jet Propulsion Laboratory, Pasadena, Calif., for NASA's Earth Science Enterprise,Washington, D.C. JPL is a division of the California Institute of Technology in Pasadena.Distance to Horizon: 176 kilometers (109 miles) Location: 34.83 deg. North lat., 119.25 deg. West lon. View: Toward the Southwest Date Acquired: February 16, 2000 SRTM, December 14, 1984 Landsat

  13. MADERA DE COMPRESIÓN EN PINUS RADIATA D. DON: I, CARACTERÍSTICAS ANATÓMICAS

    OpenAIRE

    Diaz-vaz,J.E; Fernandez,A; Valenzuela,L; Torres,M

    2007-01-01

    Se caracterizó la madera de compresión en 10 árboles de Pinus radiata D.Don con inclinaciones menores a 10 º en dos sitios.          Los diámetros de traqueidas de los árboles del sitio Arena húmeda resultaron estadísticamente mayores que los del sitio Arcilla; pero no resultaron diferentes al comparar madera juvenil y madura o al compara madera de compresión con madera opuesta.          Diferencias significativas se determinaron en el largo de traqueida entre sitios (Arena húmeda-Arcilla), t...

  14. Evaluación genética en etapa de vivero de áreas productoras de semillas (APS de Pino Ponderosa en Nordpatagonia

    Directory of Open Access Journals (Sweden)

    SCHINELLI, T.1;

    2012-08-01

    Full Text Available El Pino Ponderosa (Pinus ponderosa Dougl. ex Laws es la principal especie forestal implantada en secanoen la Patagonia. Su potencialidad productiva y la disponibilidad de tierras para su cultivo permiten proyectarla continuidad de su uso en plantaciones comerciales, para lo que es indispensable asegurar la provisión desemillas de adecuada calidad genética. Las semillas utilizadas en la última década se produjeron en una seriede rodales mediante ensayos para evaluar su descendencia. El objetivo del presente trabajo es evaluar estosrodales ensayando su descendencia. En este primer reporte presentamos los resultados de una evaluaciónen etapa de vivero. Se ensayaron 31 procedencias locales seleccionadas (Áreas Productoras de Semillas,APS en dos sitios, midiendo altura y diámetro a la altura del cuello en plantines de 2 años de edad. A través de análisis de la varianza se probó un claro efecto de interacción entre las APS y los sitios, y también diferencias entre las APS dentro de cada sitio. Seguidamente, se establecieron rankings de las APS por sitio y variable evaluada. A través de comparaciones de a pares se formaron grupos homogéneos. También se estimó la estabilidad genotípica de las APS por medio del cálculo de sus ecovalencias. Los resultados son aún preliminares, pero el haber probado diferencias en tan temprana edad nos alerta sobre la importancia de la procedencia de las semillas a utilizar para la producción comercial. Se espera que estas diferencias se acentúen en edades más avanzadas. Para probarlo, ya se han establecido ensayos de plantación.

  15. Immunolocalization of IAA and ABA in roots and needles of radiata pine (Pinus radiata) during drought and rewatering.

    Science.gov (United States)

    De Diego, N; Rodríguez, J L; Dodd, I C; Pérez-Alfocea, F; Moncaleán, P; Lacuesta, M

    2013-05-01

    Anatomical, physiological and phytohormonal changes involved in drought tolerance were examined in different Pinus radiata D. Don breeds subjected to soil drying and rewatering. Breeds with the smallest stomatal chamber size had the lowest transpiration rate and the highest intrinsic water-use efficiency. Xylem cell size was positively correlated with leaf hydraulic conductance and needle indole-3-acetic acid (IAA) concentrations, whereas transpiration rate was negatively correlated with needle abscisic acid (ABA) levels. Since these two phytohormones seem important in regulating the P. radiata drought response, they were simultaneously immunolocalized in roots and needles of the most tolerant breed (P. radiata var. radiata × var. cedrosensis) during two sequential drought cycles and after rewatering. During drought, IAA was unequally distributed into the pointed area of the needle cross-section and mainly located in mesophyll and vascular tissue cells of needles, possibly inducing needle epinasty, whereas ABA was principally located in guard cells, presumably to elicit stomata closure. In the roots, at the end of the first drought cycle, while strong IAA accumulation was observed in the cortex, ABA levels decreased probably due to translocation to the leaves. Rewatering modified the distribution of both IAA and ABA in the needles, causing an accumulation principally in vascular tissue, with residual concentrations in mesophyll, likely favouring the acclimatization of the plants for further drought cycles. Contrarily, in the roots IAA and ABA were located in the exodermis, a natural barrier that regulates the phytohormone translocation to other plant tissues and hormone losses to the soil solution after rewatering. These results confirm that immunolocalization is an efficient tool to understand the translocation of IAA and ABA in plants subjected to different water stress situations, and clarify their role in regulating physiological responses such as stomata

  16. 90SR uptake by Pinus ponderosa and Pinus radiata seedlings inoculated with ectomycorrhizal fungi

    International Nuclear Information System (INIS)

    Entry, J.A.; Emmingham, W.H.; Rygiewicz, P.T.

    1994-01-01

    Strontium-90 ( 90 Sr) is a radionuclide characteristic of fallout from nuclear reactor accidents and nuclear weapons testing. Prior studies have shown that Pinus ponderosa and P. radiata seedlings can remove appreciable quantities of 90 Sr from soil and store it in plant tissue. In this study, we inoculated P. ponderosa and P. radiata seedlings with one of five isolates of ectomycorrhizal fungi. Inoculated and noninoculated (control) seedlings were compared for their ability to remove 90 Sr from an organic growth medium. Ectomycorrhizal P. ponderosa and P. radiata seedlings are able to remove 3-5 times more 90 Sr from contaminated soil than seedlings without ectomycorrhizae. (Author)

  17. El Edificio Alto de los Pinos: una aproximación al espacio doméstico en Salmona desde el límite de la vivienda colectiva

    Directory of Open Access Journals (Sweden)

    Ingrid Quintana Guerrero

    2010-12-01

    Full Text Available ¿Es posible identificar el espacio doméstico en un proyecto determinado mediante la búsqueda de sus límites? Para responder a ello el artículo propone una reflexión desde algunos autores reconocidos en la fenomenología, principalmente Henry Maldiney (inspirado a su vez en Merleau-Ponty, debido a la importancia que otorga tanto al cuerpo y su movimiento en la concepción y posterior vivencia del hábitat como a los pares dialécticos, donde residen las dimensiones profundas de la arquitectura. Dicha reflexión se convierte en el sustrato teórico del recorrido imaginario presentado, a través de un proyecto de vivienda colectiva de Rogelio Salmona. En el Edificio Alto de los Pinos se encuentran estrategias similares que en otros proyectos de su autoría, donde el límite se fundamenta en las nociones de acontecimiento y errancia. La idea del edificio multifamiliar como una casa reinterpretada sienta las bases para el enriquecimiento de estudios y propuestas en torno al tema de la habitación contemporánea.

  18. MODELAGEM COMPUTACIONAL DO MÉTODO DE CISALHAMENTO DIRETO COM CONECTOR TIPO PINO COM CABEÇA

    OpenAIRE

    Reis Sales, Marcel Willian; Pereira Júnior, Wanderlei Malaquias; Borja Ferreira, Diego; Mikulaschek, Adriana

    2015-01-01

    Diversos tipos de lajes podem ser usados em estruturas mistas de aço concreto. Entretanto, a laje alveolar é uma boa solução, pois ela reduz a necessidade de escoras permitindo que a estrutura de concreto seja executada com velocidade compatível à estrutura metálica. Este trabalho apresenta uma discussão da ligação de cisalhamento promovida em vigas mistas de aço concreto, por conectores tipo pino com cabeça. A ligação é feita pelo conector e preenchida com concreto, podendo existir ou não ar...

  19. Comportamento estrutural de vigas de concreto reforçadas com ripas de bambu cravejadas de pinos

    OpenAIRE

    Braga Filho,Antonio C.; Lima Júnior,Humberto C.; Barbosa,Normando P.; Willrich,Fabio L.

    2010-01-01

    Uma das deficiências do bambu reforçando vigas de concreto armado está relacionada com deslocamentos relativos entre os dois materiais. A investigação aqui reportada teve como objetivo avaliar experimentalmente a possibilidade de se melhorar o trabalho conjunto bambu-concreto, através do cravejamento de pinos nas ripas de bambu usadas como reforço. Para tanto, oito vigas de concreto foram ensaiadas, das quais seis foram reforçadas com ripas de bambu Dendrocalamus giganteus Munro cravejadas de...

  20. Climate as possible reproductive barrier in Pinus radiata (D. Don interspecific hybridisation

    Directory of Open Access Journals (Sweden)

    Hannél Ham

    2017-12-01

    Full Text Available Historically, interspecific hybridisation with Pinus radiata D. Don had limited success. The effect of environmental conditions and position of pollination bags in the tree were investigated as possible hybridisation barriers. The study was conducted in a P. radiata seed orchard in the Southern Cape (South Africa. Field data were compared to the climatic conditions at natural and commercial provenances of seven Mesoamerican Pinus species identified as possible hybrid partners. In vitro pollen studies were used to confirm whether interspecific crosses with P. radiata might be feasible within predefined climatic parameters. The temperature ranges for both top and northern side of P. radiata pine trees in the seed orchard was similar to the natural distribution of P. radiata, P. elliottii Engelm. and P. taeda L. in the USA. Results suggested that pollen of P. elliottii and P. taeda might be more suited to result in the successful pollination of P. radiata than the other Mesoamerican pine species tested in this study.  Furthermore, the combination of minimum temperature and precipitation also showed a closer correlation to successful hybridisation with P. radiata for both P. elliotii and P. taeda. However, pollen tube elongation studies did not support these results, suggesting that mean temperature might not be the only determining factor of hybridisation success. Three circadian temperature models that mimic natural conditions were developed for Karatara and Sabie (Tweefontein, Witklip and Spitskop.  These models will be tested in future in vitro studies to further evaluate temperature fluctuations between day and night regimes as a possible reproductive barrier limiting hybridisation success between P. radiata and other Mesoamerican pine species.

  1. Análise comparativa da distribuição de tensões em incisivo central superior, restaurado com diferentes sistemas de pinos intra-radiculares

    OpenAIRE

    Oliveira, Luana Cristina Araújo de [UNESP

    2002-01-01

    Neste trabalho é proposto analisar a distribuição de tensões produzidas na dentina radicular do incisivo central superior restaurado com diferentes sistemas de pinos intra-radiculares, através dos Métodos de Fotoelasticidade e Elementos Finitos. Esta análise foi realizada para os seguintes sistemas de pinos intra-radiculares: fibra de carbono, fibra de vidro, zircônio, aço inoxidável, titânio e metálico fundido (Liga de Cu-Al), o dente hígido foi utilizado como controle. Em ambos método foi c...

  2. Comportamento estrutural de vigas de concreto reforçadas com ripas de bambu cravejadas de pinos Structural behavior of concrete beams reinforced with pinned bamboo-splints

    Directory of Open Access Journals (Sweden)

    Antonio C. Braga Filho

    2010-10-01

    Full Text Available Uma das deficiências do bambu reforçando vigas de concreto armado está relacionada com deslocamentos relativos entre os dois materiais. A investigação aqui reportada teve como objetivo avaliar experimentalmente a possibilidade de se melhorar o trabalho conjunto bambu-concreto, através do cravejamento de pinos nas ripas de bambu usadas como reforço. Para tanto, oito vigas de concreto foram ensaiadas, das quais seis foram reforçadas com ripas de bambu Dendrocalamus giganteus Munro cravejadas de pinos e duas armadas com ripas de bambu sem a presença dos pinos, como referência. Usaram-se dois tipos de pino: de aço ou de bambu, em número de dois, três ou quatro pinos entre nós. Curvas força-deslocamento e força-deformação dos materiais são apresentadas e discutidas, em que os resultados mostraram que a cravação dos pinos produziu um aumento de rigidez das vigas; contudo, o furo feito para colocação do pino reduziu localmente a seção transversal da ripa de bambu e, consequentemente, a resistência última das vigas. Finalmente, resultados similares foram obtidos em vigas reforçadas com pino de aço ou de bambu.One drawback of bamboo as concrete reinforcement beams is the relative displacement between the two materials. The research reported in this paper aimed to experimentally investigate the improvement of bamboo-concrete-bond by means of nailing. Eight concrete beams were tested, six of them reinforced with Dendrocalamus giganteus Munro nailed bamboo-splints and two reference beams, reinforced with bamboo-splints without pins. Steel pins or bamboo pins were used. Two, three and four pins were nailed between bamboo nodes. Load-displacement and load-strain curves are presented and discussed. The results showed that the pins improved the beam stiffness; nevertheless, they reduced locally the transversal section of the bamboo splint and, consequently, the ultimate load. Finally, similar results were showed by beams reinforced

  3. Forested habitat preferences by Chilean citizens: Implications for biodiversity conservation in Pinus radiata plantations Preferencia por hábitats forestales por ciudadanos chilenos: Implicancias para la conservación de biodiversidad en plantaciones de Pinus radiata

    Directory of Open Access Journals (Sweden)

    NICOLE PÜSCHEL-HOENEISEN

    2012-06-01

    Full Text Available The need for conservation outside protected areas has prompted the modification of productive practices to allow the maintenance of wild biota in productive landscapes such as those associated to timber production. Forest plantations could cooperate in conserving biodiversity outside protected areas if they have a developed understory. However, the success of the production changes depends on the social support they receive. Therefore, we evaluate Chilean citizens' preference for five habitats of different types of forest management. In addition, we assessed perceptions regarding the relationship between pine plantations and native wildlife through surveys administered in Chillán, Santiago and six rural localities in the VII and VIII region. Despite there is not a unanimous opinion regarding pine plantations as a threat to biodiversity, people prefer pine plantations that serve as habitat for endangered fauna. In fact, they agree on paying more for forest products to contribute to conservation in forest plantations, and actually prefer plantations with a developed understory better than those without it. This would suggest that measures aimed at conservation in forest plantations could be supported by the Chilean society.La necesidad de la conservación fuera de áreas protegidas ha llevado a la modificación de las prácticas productivas para permitir el mantenimiento de la biota silvestre en paisajes productivos tales como los asociados a la producción de madera. Las plantaciones forestales podrían cooperar en la conservación de la biodiversidad fuera de áreas protegidas si tienen un sotobosque desarrollado. Sin embargo, el éxito de los cambios en la producción depende del apoyo social que estos reciben. Así, evaluamos la preferencia por cinco paisajes con diferentes tipos de manejo forestal. Además, se evaluó la percepción acerca de la relación entre las plantaciones de pino y la fauna nativa a través de encuestas realizadas en

  4. Progress towards initiation of somatic embryogenesis from differentiated tissues of radiata pine (Pinus radiata D. Don) using cotyledonary embryos

    DEFF Research Database (Denmark)

    Find, Jens Iver; Hargreaves, Cathy L.; Reeves, Catherine B.

    2014-01-01

    of dissected embryos and a modified Litvay medium, Glitz, was best. This combination gave the highest rate of initiation, and it was possible to initiate somatic embryogenesis (SE) from differentiated cells in the epicotyledonary region of postcotyledonary zygotic embryos from the two tested families...... with an average initiation rate of approximately 24% and 7% from stage five and six embryos, respectively. This is different from established initiation protocols of embryogenic cultures in radiata pine, which has traditionally been based on embryo rescue and continued proliferation of immature zygotic embryos....... A further implication of initiation of SE from excised post-cotyledonary embryos was that the period of initiation of embryogenic cultures was extended from 4 to 12 wk....

  5. Mechanism of Resistance in Mungbean [Vigna radiata (L. R. Wilczek var. radiata] to bruchids, Callosobruchus spp. (Coleoptera: Bruchidae

    Directory of Open Access Journals (Sweden)

    Abdul R. War

    2017-06-01

    Full Text Available Mungbean [Vigna radiata (L. R. Wilczek var. radiata] is an important pulse crop in Asia, and is consumed as dry seeds and as bean sprouts. It is an excellent source of digestible protein. Bruchids [Callosobruchus chinensis (L. and Callosobruchus maculatus (F.] are the important pests of mungbean and cause damage in the field and in storage. Bruchid infestation reduces the nutritional and market value of the grain and renders seeds unfit for human consumption, agricultural and commercial uses. These pests are controlled mainly by fumigation with highly toxic chemicals such as carbon disulfide, phosphene, and methyl bromide, or by dusting with several other insecticides, which leave residues on the grain, thus, threatening food safety. Some plant-based extracts have been found useful in controlling bruchids, but are not fully successful due to their short-term activity, rapid degradability, and potentially negative effect on seed germination. Although some wild sources of bruchid resistance in mungbean have been reported, which have been used to develop bruchid- resistant lines, undesirable genetic linkages threaten the proper exploitation of genetic diversity from wild germplasm into commercial cultivars. Further, biotype variation in bruchids has rendered some mungbean lines susceptible that otherwise would have been resistant to the pest. Host plant resistance is a cost-effective and a safe alternative to control bruchids in mungbean and is associated with morphological, biochemical, and molecular traits. These traits affect insect growth and development, thereby, reduce the yield losses by the pests. Understanding the defense mechanisms against insect pests could be utilized in exploiting these traits in crop breeding. This review discusses different traits in mungbean involved in defense against bruchids and their utility in pest management. We also highlight the breeding constraints for developing bruchid-resistant mungbean and how can these

  6. Análise da Fragilidade do Core - Quando reconstruído com diferentes resinas e pinos pré-fabricados não metálicos

    OpenAIRE

    Ávilal, Gisseli Bertozzi; Dias, Sérgio Cândido; Ribeiro, José Carlos Rabelo; Gomes, Priscila Nogueira; Moysés, Marcos Ribeiro

    2016-01-01

    Para realização deste estudo vinte condutos artificiais foram construídos em blocos formados por esmalte e dentina, a partir de dentes bovinos. Dez pinos de fibra de vidro e dez de fibra de carbono foram cimentados nos condutos com cimento resinoso C&B. Empregou-se matriz de policarbonato para confecção do core em resina composta, perfazendo quatro grupos: Grupo (1) pino de fibra de vidro e core com resina composta Charisma; Grupo (2) pino de fibra de carbono e core com resina composta Charis...

  7. Serrated leaf mutant in mungbean (Vigna radiata (L) Wilczek)

    International Nuclear Information System (INIS)

    Malik, I.A.; Ghulam, Sarwar; Yousaf, Ali; Saleem, M.

    1988-01-01

    Dry dormant seeds of mungbean (Vigna radiata (L) Wilczek) were treated with gamma rays (15, 30 and 60 kR). The serrated leaf mutation was noticed in M 2 of cultivar Pak 32 treated with 60 kR. Cf 14 plants, 3 showed the altered leaf structure and the others were normal. The feature of this mutant was the deep serration of leaflet margins. The mutant had large thick leaflets with prominent venation. The mutant bred true in the M 3 and successive generation. Details of the morphological characteristics of the mutant are presented. The mutant exhibited slower growth particularly during the early stages of development, flowered later and attained shorter height. There was an increase in the number of pods, in seed weight and in seed protein content, but number of seed per pod was considerably reduced. The seed coat colour showed a change from green to yellowish green. In the mutant's flowers the stamina were placed much below the stigma level and the stigma sometimes protruded the corolla. Outcrossing of 4% recorded in some of the mutant lines revealed a reduced cleistogamy. The low number of seeds per pod in the mutant could be due to reduced pollen fertility. The mutant behaved as monogenic recessive. The symbols SL/sl are proposed for this allelic pair. The mutant may have use as a green manure crop because of its large foliage and for the breeders as a genetic marker

  8. Efeito do tratamento do canal radicular com EDTA na retenção de pinos de fibra de vidro

    OpenAIRE

    Luis Alfonso Arana Gordillo

    2010-01-01

    A proposição deste estudo foi analisar o efeito do tratamento da dentina radicular com EDTA na retenção de pinos de fibra de vidro utilizando dois tipos diferentes de cimentos resinosos. Foram utilizados 40 dentes humanos pré-molares hígidos. Após a extração os dentes foram armazenados em água até seu uso. Em seguida, os dentes foram tratados endodonticamente com técnica step back para ser obturados por condensação lateral com cones de guta percha e cimento endodôntico AH Plus. Após a obturaç...

  9. Caracterización de sitios de percha del guajolote silvestre (Meleagris gallopavo mexicana) en Sierra Fría, Aguascalientes, México Roost sites characteristics of wild turkey (Meleagris gallopavo mexicana) in Sierra Fria, Aguascalientes, Mexico

    OpenAIRE

    Marcelo Márquez-Olivas; Edmundo García-Moya; Carlos González-Rebeles Islas; Humberto Vaquera-Huerta

    2007-01-01

    Entre octubre y noviembre del año 2001 y mayo de 2002 se localizaron 16 sitios de percha de guajolote silvestre (Meleagris gallopavo mexicana) en la Sierra Fría de Aguascalientes. El 87.5% de los sitios se encontraron en bosques de pino-encino (en rodales de pinos), en altitudes de 2500 a 2650 m. En la parte alta (2/3) de la cuesta se localizaron 8 de los sitios y 7 sobre laderas de exposición noreste, en una pendiente promedio de 38.9 ± 12.6%. El 62.5% de los sitios se usaron durante todo el...

  10. Vigna radiata as a New Source for Biotransformation of Hydroquinone to Arbutin

    Directory of Open Access Journals (Sweden)

    Zahra Tofighi, Mohsen Amini, Mahzad Shirzadi, Hamideh Mirhabibi, Negar Ghazi Saeedi, Narguess Yassa

    2016-06-01

    Full Text Available Background: The suspension culture of Vigna radiata was selected for biotransformation of hydroquinone to its β-D-glucoside form (arbutin as an important therapeutic and cosmetic compound. Methods: The biotransformation efficiency of a Vigna radiata cell culture in addition to different concentrations of hydroquinone (6-20 mg/100 ml was investigated after 24 hours in comparison to an Echinacea purpurea cell culture and attempts were made to increase the efficacy of the process by adding elicitors. Results: Arbutin was accumulated in cells and found in the media only in insignificant amounts. The arbutin content of the biomass extracts of V. radiata and E. purpurea was different, ranging from 0.78 to 1.89% and 2.00 to 3.55% of dry weight, respectively. V. radiata demonstrated a bioconversion efficiency of 55.82% after adding 8 mg/100 ml precursor, which was comparable with result of 69.53% for E. purpurea cells after adding 10 mg/100 ml hydroquinone (P>0.05. In both cultures, adding hydroquinone in two portions with a 24-hour interval increased the biotransformation efficiency. Different concentrations of methyl jasmonate (25, 50, and 100 µM and chitosan (50 and 100 µg/ml as elicitors increased the bio-efficiency percentage of the V. radiata culture in comparison with the flask containing only hydroquinone. Conclusion: This is the first report of the biotransformation possibility of V. radiata cultures. It was observed the bioconversion capacity increased by adding hydroquinone in two portions, which was comparable to adding an elicitor.

  11. Primer Registro de Tamarixia radiata (Waterston, 1922 (Hymenoptera: Eulophidae en Colombia Record of Tamarixia radiata (Waterston, 1922 (Hymenoptera: Eulophidae in Colombia

    Directory of Open Access Journals (Sweden)

    Everth Emilio Ebratt Ravelo

    2011-12-01

    Full Text Available Tamarixia radiata es un ectoparasitoide idiobionte de Diaphorina citri Kuwayama (Hemiptera: Psyllidae; la especie fue descrita a partir de material recogido en la India. Ha sido introducida en muchas regiones intencional o accidentalmente para el control biológico de D. citri, incluyendo algunos países asiáticos. Se sabe de su presencia en el sur de África y las Américas. En Suramérica, se reportó en Brasil, Argentina y ahora en Colombia.Tamarixia radiata is an ectoparasitoid idiobionte of Diaphorina citri Kuwayama (Hemiptera: Psyllidae; the species was described from material collected in India. It has been introduced in many regions intentionally or accidentally, to biological control of D. citri, including some Asian countries. It is know about its presence in southern Africa and the Americas. In South America, it is present in Brazil, Argentina and now in Colombia.

  12. El mundo del libro: enero de 1966

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    Agustín Rodríguez Garavito

    1966-01-01

    Full Text Available El documento presenta las reseñas de los siguientes títulos: -Los gritos infinitos-Poemas. Por Rafael Ortiz González. -Cielo y asfalto-Novela. Por Augusto Morales-Pino. -Bartolomé de las Casas-Biografía. Por Lewis Hanke- Ediciones Tercer Mundo. -Entre el Mar Rojo y el Mar Muerto. Por Germán Arciniegas- Editorial Edhasa. -La alternativa del desarrollo. Por Misael Pastrana Borrero- Editorial Diario Económico.

  13. Response in water yield to the thinning of Pinus radiata, Pinus patula and Eucalyptus grandis plantations

    CSIR Research Space (South Africa)

    Lesch, W

    1997-12-15

    Full Text Available . radiata plantation in the Biesievlei catchment, annual stream flow increased by between 10 and 71% (19-99 mm). These increases persisted for three and two years after the thinning, respectively. A final thinning in the same catchment removed only 22...

  14. Polyamine levels during the development of zygotic and somatic embryos of Pinus radiata

    Science.gov (United States)

    Rakesh Minocha; Dale R. Smith; Cathie Reeves; Kevin D. Steele; Subhash C. Minocha

    1999-01-01

    Changes in the cellular content of three polyamines (putrescine, spermidine and spermine) were compared at different stages of development in zygotic and somatic embryos of Pinus radiata D. Don. During embryo development, both the zygotic and the somatic embryos showed a steady increase in spermidine content, with either a small decrease or no...

  15. Population structure and historical demography of the thorny skate (Amblyraja radiata, Rajidae) in the North Atlantic

    NARCIS (Netherlands)

    Chevolot, M.; Wolfs, P.H.J.; Palsson, J.; Rijnsdorp, A.D.; Stam, W.T.; Olsen, J.L.

    2007-01-01

    Population genetic structure of the thorny skate (Amblyraja radiata) was surveyed in >300 individuals sampled from Newfoundland, Iceland, Norway, the Kattegat and the central North Sea. A 290-bp fragment of the mt cytochrome-b gene was first screened by SSCP. Sequences of SSCP haplotypes revealed

  16. Population structure and historical demography of the thorny skate (Amblyraja radiata, Rajidae) in the North Atlantic

    NARCIS (Netherlands)

    Chevolot, Malia; Wolfs, Peter H. J.; Palsson, Jonbjorn; Rijnsdorp, Adriaan D.; Stam, Wytze T.; Olsen, Jeanine L.; Palson, J.

    Population genetic structure of the thorny skate (Amblyraja radiata) was surveyed in > 300 individuals sampled from Newfoundland, Iceland, Norway, the Kattegat and the central North Sea. A 290-bp fragment of the mt cytochrome-b gene was first screened by SSCP. Sequences of SSCP haplotypes revealed

  17. Potential biochemical markers for selection of disease resistance in Vigna radiata

    International Nuclear Information System (INIS)

    Badere, R.S.; Koche, D.K.; Choudhary, A.D.; Pawar, S.E.

    2001-01-01

    The Vigna radiata (L.) Wilczek (Green gram), a major pulse crop is prone to damaging diseases caused by Erysiphe polygoni, Cercospora canescens and Rhizoctonia sp. Therefore, the development of multiple resistance is a major breeding objective in green gram. Resistance to powdery mildew has already been developed, however, there are no reports on the development of resistance to Cercospora in green gram. Owing to limitation of conventional screening methods, the improvement for multiple disease resistance is inadequate, in this crop. It needs an efficient and quick selection method, for screening the plant population at an early stage. It is well established that the resistant interaction, in plants, involves accumulation of antibiotic compound phytoalexin (Genestein in Vigna radiata) and induction of enzymes such as β-1,3 gulcanase and Chitinases. These compounds are not only induced by pathogens but also pathogen-derived elicitors. These biochemical compounds can be used as resistance indicative biochemical markers for screening the natural or mutagen induced genetic diversity in populations of Vigna radiata in non-destructive manner. It, however, needs a systematic study of plant defense response. This paper deals with the response of resistant and susceptible cultivars of vigna radiata to Cercospora elicitor and development of non-destructive selection method for disease resistance. (author)

  18. Metabolome Integrated Analysis of High-Temperature Response in Pinus radiata

    Directory of Open Access Journals (Sweden)

    Mónica Escandón

    2018-04-01

    Full Text Available The integrative omics approach is crucial to identify the molecular mechanisms underlying high-temperature response in non-model species. Based on future scenarios of heat increase, Pinus radiata plants were exposed to a temperature of 40°C for a period of 5 days, including recovered plants (30 days after last exposure to 40°C in the analysis. The analysis of the metabolome using complementary mass spectrometry techniques (GC-MS and LC-Orbitrap-MS allowed the reliable quantification of 2,287 metabolites. The analysis of identified metabolites and highlighter metabolic pathways across heat time exposure reveal the dynamism of the metabolome in relation to high-temperature response in P. radiata, identifying the existence of a turning point (on day 3 at which P. radiata plants changed from an initial stress response program (shorter-term response to an acclimation one (longer-term response. Furthermore, the integration of metabolome and physiological measurements, which cover from the photosynthetic state to hormonal profile, suggests a complex metabolic pathway interaction network related to heat-stress response. Cytokinins (CKs, fatty acid metabolism and flavonoid and terpenoid biosynthesis were revealed as the most important pathways involved in heat-stress response in P. radiata, with zeatin riboside (ZR and isopentenyl adenosine (iPA as the key hormones coordinating these multiple and complex interactions. On the other hand, the integrative approach allowed elucidation of crucial metabolic mechanisms involved in heat response in P. radiata, as well as the identification of thermotolerance metabolic biomarkers (L-phenylalanine, hexadecanoic acid, and dihydromyricetin, crucial metabolites which can reschedule the metabolic strategy to adapt to high temperature.

  19. Discovering and verifying DNA polymorphisms in a mung bean [V. radiata (L. R. Wilczek] collection by EcoTILLING and sequencing

    Directory of Open Access Journals (Sweden)

    Dean Rob E

    2008-06-01

    Full Text Available Abstract Background Vigna radiata, which is classified in the family Fabaceae, is an important economic crop and a dietary staple in many developing countries. The species radiata can be further subdivided into varieties of which the variety sublobata is currently acknowledged as the putative progenitor of radiata. EcoTILLING was employed to identify single nucleotide polymorphisms (SNPs and small insertions/deletions (INDELS in a collection of Vigna radiata accessions. Findings A total of 157 DNA polymorphisms in the collection were produced from ten primer sets when using V. radiata var. sublobata as the reference. The majority of polymorphisms detected were found in putative introns. The banding patterns varied from simple to complex as the number of DNA polymorphisms between two pooled samples increased. Numerous SNPs and INDELS ranging from 4–24 and 1–6, respectively, were detected in all fragments when pooling V. radiata var. sublobata with V. radiata var. radiata. On the other hand, when accessions of V. radiata var. radiata were mixed together and digested with CEL I relatively few SNPs and no INDELS were detected. Conclusion EcoTILLING was utilized to identify polymorphisms in a collection of mung bean, which previously showed limited molecular genetic diversity and limited morphological diversity in the flowers and pod descriptors. Overall, EcoTILLING proved to be a powerful genetic analysis tool providing the rapid identification of naturally occurring variation.

  20. Analisis y estudio del contenido de humedad final de la madera

    Directory of Open Access Journals (Sweden)

    Eduardo Gómez Ihmaidan

    2006-07-01

    Full Text Available La finalidad de este trabajo es proporcionar e interactuar con la  información referente al  proceso de secado industrial de Pino Radiata, tomando como variable el contenido de humedad final de la madera, en términos generales esta información será útil para negociar y tomar decisiones frente a  clientes que demandan por productos con ciertas especificaciones técnicas, cuantificando además los costos en que se incurre por estar fuera de los parámetros solicitados. La primera parte de este trabajo consistió en la recolección de datos del contenido de humedad final de los principales productos de Aserraderos Arauco S.A., los que fueron tomados manualmente por personal de la empresa con equipos xilohigrómetros de marca Wagner L612 y medidores automatizados en línea Brookhuis.  Con estos datos, el histograma fue la herramienta gráfica que permitió el ajuste de curvas de las distribuciones de probabilidad de cada producto utilizando el software @Risk  4.5, con esta información se procedió a buscar las funciones de probabilidad acumulada respectivas, y además aproximaciones matemáticas que permitieran el cálculo de éstas para conocer la probabilidad de estar entre un mínimo y un máximo de contenido de humedad. Para evaluar la variabilidad y tendencia central del contenido de humedad se procedió a calcular mediante los índices de la capacidad de procesos Cp y Cpk en qué medida el proceso de secado es capaz de cumplir con las especificaciones solicitadas por el cliente, debido a que los datos no presentaban un comportamiento normal fue necesario investigar y encontrar el cálculo de estos índices de capacidad para este caso. Otro aspecto importante considerado en este trabajo fue la incorporación de la función de Costo de Calidad del Dr. Taguchi en la cuál se evalúa monetáriamente todos los costos en que se incurre cuando el producto no satisface las especificaciones del cliente, ya sea productos demasiado h

  1. Descripción del canto de anuncio de una población de Oreobates discoidalis (Anura: Strambomantidae

    Directory of Open Access Journals (Sweden)

    Ferrari, Liliana

    2008-09-01

    Full Text Available En este trabajo, analizamos y describimos la estructura del canto de anuncio de ejemplares de una población de Oreobates discoidalis proveniente de una región de selva de montaña del Noroeste de Argentina (Ecorregión de las Yungas Andinas del Sur, según Dinerstein et al., 1995 y efectuamos una comparación con los parámetros espectrales y temporales del canto de anuncio descriptos para la especie en una población de Campos de Pinos en Bolivia por Padial et al. (2008.

  2. La corteza de pino como adsorbente natural de metales pesados en suelos contaminados

    OpenAIRE

    Cutillas Barreiro, Laura

    2017-01-01

    La contaminación de suelos por metales pesados se está convirtiendo en una preocupación ambiental en las últimas décadas debido al incremento de las actividades industriales y al progreso de la agricultura, que pueden provocar que se eleven sus concentraciones hasta niveles potencialmente fitotóxicos, provocando una pérdida de la calidad del suelo y limitando su uso. Esto también puede afectar a la calidad de las aguas, tanto superficiales como freáticas, ampliando así el impac...

  3. Análise comparativa da resistência de união de um cimento convencional e um cimento autoadesivo após diferentes tratamentos na superfície de pinos de fibra de vidro

    Directory of Open Access Journals (Sweden)

    Juliana das Neves MARQUES

    Full Text Available Resumo Introdução Os pinos de fibra de vidro são uma alternativa aos núcleos metálicos e apresentam vantagens, tais como: estética, módulo de elasticidade semelhante à dentina e cimentação imediata após o término do tratamento endodôntico. Ainda, apresentam a capacidade de aderir ao cimento resinoso e este, à dentina, por meio de técnicas adesivas. Objetivo Comparar a adesão de um cimento resinoso convencional e um autoadesivo a pinos de fibra de vidro, e os efeitos de diferentes tratamentos de superfície na resistência adesiva dos pinos. Material e método Trinta pinos foram divididos em três grupos: Controle: sem tratamento na superfície; Jateamento: jateamento com óxido de alumínio por 30 segundos, e Peróxido: imersão em peróxido de hidrogênio 24% por um minuto. Em seguida, corpos de prova foram obtidos a partir de cilindros de cimento resinoso contendo o pino de fibra posicionado no centro de seu longo eixo. Em cada grupo, cinco pinos foram associados ao adesivo Âmbar + cimento convencional AllCem Core e os outros cinco pinos, ao cimento autoadesivo RelyX U200. O conjunto pino/cimento foi segmentado e avaliado em relação à resistência de união (RU por push-out. Os dados foram analisados estatisticamente pelos testes de ANOVA e Tukey (p<0,05. Resultado Os cimentos avaliados exibiram valores de RU semelhantes. Em relação aos tratamentos de superfície, os maiores valores de RU foram encontrados no grupo Jateamento. Conclusão O cimento convencional, AllCem Core, e o cimento autoadesivo, RelyX U200, mostraram valores de resistência de união semelhantes. Ainda, o jateamento com óxido de alumínio favoreceu a adesão dos pinos aos cimentos.

  4. Equilibrium moisture content of radiata pine at elevated temperature and pressure reveals measurement challenges

    DEFF Research Database (Denmark)

    Pearson, Hamish; Gabbitas, Brian; Ormarsson, Sigurdur

    2012-01-01

    moisture contents were attributed to condensation of liquid water on the specimen with subsequent evaporation at a rate that was too slow for the moisture content to reach equilibrium before it was measured. Reliable EMC data at elevated temperatures require (1) tight process control of experimental......Relatively few studies have been performed on the equilibrium moisture content (EMC) of wood under conditions of elevated temperature and pressure. Eight studies indicated that EMC near saturation decreased between 100 and 150 °C, whilst five studies indicated that EMC increased. The aim...... of this study was to identify the likely source of the disagreement using radiata pine (Pinus radiata D. Don) sapwood which was conditioned to a moisture content of around 3 % and then exposed for 1 h at 150 °C and relative humidities of either 50, 70 or 90 %. Mean values of EMC, obtained through in situ...

  5. Relationship between fiber porosity and cellulose digestibility in steam-exploded Pinus radiata

    Energy Technology Data Exchange (ETDEWEB)

    Wong, K.K.Y.; Deverell, K.F.; Mackie, K.L.; Clark, T.A.; Donaldson, L.A.

    1988-04-05

    The use of lignocellulosic materials in bioconversion processes may be improved if the critical factors limiting conversion are better understood. Steam explosion after sulfur dioxide impregnation of wood chips is an effective method for improving the enzymatic digestibility of cellulose in the softwood Pinus radiata. Digestibility of pretreated fiber was progressively increased by altering the conditions of steam explosion. With increasing digestibility, there was an observed increase in fiber porosity as measured by the solute exclusion technique. Accessible pore volume and accessible surface area to a 5-nm dextran probe positively correlated with both 2- and 24-h digestion yields from pretreated fiber. The increase in accessibility was probably the result of hemicellulose extraction and lignin redistribution. A subsequent loss in accessibility, brought about by structural collapse or further lignin redistribution, resulted in a corresponding loss in digestibility. It appears that steam explosion increases cellulose digestibility in P. radiata by increasing fiber porosity.

  6. Above-ground biomass equations for Pinus radiata D. Don in Asturias

    Directory of Open Access Journals (Sweden)

    E. Canga

    2013-12-01

    Full Text Available Aim of the study: The aim of this study was to develop a model for above-ground biomass estimation for Pinus radiata D. Don in Asturias.Area of study: Asturias (NE of Spain.Material and methods: Different models were fitted for the different above-ground components and weighted regression was used to correct heteroscedasticity. Finally, all the models were refitted simultaneously by use of Nonlinear Seemingly Unrelated Regressions (NSUR to ensure the additivity of biomass equations.Research highlights: A system of four biomass equations (wood, bark, crown and total biomass was develop, such that the sum of the estimations of the three biomass components is equal to the estimate of total biomass. Total and stem biomass equations explained more than 92% of observed variability, while crown and bark biomass equations explained 77% and 89% respectively.Keywords: radiata pine; plantations; biomass.

  7. Diaphorina citri (Kuwayama, 1907 and Tamarixia radiata (Waterson, 1922 in citrus crops of Cundinamarca, Colombia

    Directory of Open Access Journals (Sweden)

    Ebratt Ravelo Everth Emilio

    2011-12-01

    Full Text Available

    The presence of Diaphorina citri Kuwayama (Hemiptera: Psyllidae and Tamarixia radiata (Waterston (Hymenoptera: Eulophidae was recorded in citrus crops of Cundinamarca, Colombia. This work is to know the geographic distribution of D. citri and an initial record of the parasitoid T. radiata in citrus producing areas of this department.

  8. Physiological response to drought in radiata pine: phytohormone implication at leaf level.

    Science.gov (United States)

    De Diego, N; Pérez-Alfocea, F; Cantero, E; Lacuesta, M; Moncaleán, P

    2012-04-01

    Pinus radiata D. Don is one of the most abundant species in the north of Spain. Knowledge of drought response mechanisms is essential to guarantee plantation survival under reduced water supply as predicted in the future. Tolerance mechanisms are being studied in breeding programs, because information on such mechanisms can be used for genotype selection. In this paper, we analyze the changes of leaf water potential, hydraulic conductance (K(leaf)), stomatal conductance and phytohormones under drought in P. radiata breeds (O1, O2, O3, O4, O5 and O6) from different climatology areas, hypothesizing that they could show variable drought tolerance. As a primary signal, drought decreased cytokinin (zeatin and zeatin riboside-Z + ZR) levels in needles parallel to K(leaf) and gas exchange. When Z + ZR decreased by 65%, indole-3-acetic acid (IAA) and abscisic acid (ABA) accumulation started as a second signal and increments were higher for IAA than for ABA. When plants decreased by 80%, Z + ZR and K(leaf) doubled their ABA and IAA levels, the photosystem II yield decreased and the electrolyte leakage increased. At the end of the drought period, less tolerant breeds increased IAA over 10-fold compared with controls. External damage also induced jasmonic acid accumulation in all breeds except in O5 (P. radiata var. radiata × var. cedrosensis), which accumulated salicylic acid as a defense mechanism. After rewatering, only the most tolerant plants recovered their K(leaf,) perhaps due to an IAA decrease and 1-aminocyclopropane-1-carboxylic acid maintenance. From all phytohormones, IAA was the most representative 'water deficit signal' in P. radiata.

  9. Application of gamma radiation to the nodes detection in Pinus Radiata (D.Don) wood pieces

    International Nuclear Information System (INIS)

    Morales, J.R.; Dinator, Maria I; Karsulovic C, Jose T.; Leon G, Adolfo

    1996-01-01

    Attenuation of 59.5 KeV photons provided by an Am-241 source, has been used to detect knots in lumber pieces from Pinus Radiata (D.Don). It is shown that the linear attenuation coefficient is a sensitive parameter to detect singularities in the structure of this material. The scanning of the piece provides profiles which define the position and extension of the singularity. (author)

  10. Thermal hygrometric requirements for the rearing and release of Tamarixia radiata (Waterston (Hymenoptera, Eulophidae

    Directory of Open Access Journals (Sweden)

    Mariuxi Lorena Gómez-Torres

    2014-09-01

    Full Text Available Thermal hygrometric requirements for the rearing and release of Tamarixia radiata (Waterston (Hymenoptera, Eulophidae. Tamarixia radiata is the main agent for the biological control of Diaphorina citri in Brazil with a parasitism rate ranging from 20 to 80%. This study investigated the influence of temperature on the development, fecundity and longevity of adults of T. radiata and the effect of relative humidity (RH on their parasitism capacity and survival rate in the pre-imaginal period. The effect of temperature was assessed in the range between 15 and 35 ± 1ºC, 70 ± 10% RH, and a 14-h photophase. The RH effect was evaluated in the range from 30 to 90 ± 10%, temperature at 25 ± 1ºC, and photophase of 14-h. At 25ºC, circa 166.7 nymphs were parasitized, the highest parasitism capacity observed compared to other treatments. The longest longevity of females was observed at 25ºC, although the rate did not differ in the 20-30ºC temperature range. The threshold temperature (TT was 7.2ºC, and 188.7 degrees-day were required for the development (egg-to-adult period. The parasitism rate and longevity were higher at 50 and 70% of RH. This shows that temperature and RH may affect the parasitism capacity of T. radiata on nymphs of D. citri, which can explain the great parasitism variation for D. citri observed in citrus groves in São Paulo State, Brazil.

  11. Ethanol production from Lycoris radiata Herbert (Amarylllidaceae) residues as a new resource

    International Nuclear Information System (INIS)

    Liu, Shuangping; Ding, Zhongyang; Zhang, Liang; Gu, Zhenghua; Wang, Xiaolan; Sun, Xiaojun; Shi, Guiyang

    2012-01-01

    The large quantities of Lycoris radiata Herbert (Amarylllidaceae) residues, left after the extraction of alkaloids from the bulbs, could threaten the environment if not properly disposed. Therefore, the aim of this research is to investigate the feasibility of bioconversion of L. radiata Herbert residues to ethanol through batch fermentation. In L. radiata Herbert residues, the average contents (g kg −1 ) of non-structural carbohydrates, crude fiber, crude protein, ash, and lignin are 485.1, 177.3, 124.7, 108.9, and 91.0, respectively. Five commercial enzymes (β-glucanase, pectinase, xylanase, phytase and cellulase) were employed in pretreatment process and ethanol bioconversion was evaluated with three yeasts (Saccharomyces cerevisiae, osmotolerant S. cerevisiae and genetically engineered S. cerevisiae constructed to use cellobiose). The results showed that pretreament by β-glucanase successfully facilitated the penetration of α-amylase into ground material. After residues pretreatment by 10 g kg −1 of β-glucanase for 14 h at 50 °C, the viscosity decreased from 1135 to 59 Pa·s which was equivalent to that obtained by the combined whole five enzymes. Further experiments proved that osmotolerant S. cerevisiae was desirable for ethanol production from Lycoris radiate Herbert residues. The results are helpful to develop non-grain bioethanol production. -- Highlights: ► The residuals from Lycoris radiata Herbert bulbs were able to generate 55% ethanol concentrations by yeast fermentation. ► Treatment with xylanase significantly reduced the viscosity more than 10-fold and improved fermentable sugars by ∼35%. ► An osmotolerant Saccharomyces cerevisiae strain that showed improved fermentation rates was identified.

  12. Clinicoradiological study on 59 patients with pure motor hemiparesis due to corona radiata infarcts

    International Nuclear Information System (INIS)

    Nagaoka, Tetsuro; Kawabe, Kiyokazu; Ito, Hirono; Ikeda, Ken

    2009-01-01

    To evaluate the clinicoradiological findings of patients with small infarction at the level of the corona radiata, such patients were divided into three groups: Group A (facio-lingual weakness), Group B (arm-dominant weakness) and Group C (leg-dominant weakness). The anteroposterior position and maximum diameter of the radiata infarcts were assessed by axial T2-weighted imaging. In total, 59 consecutive patients (42 men and 17 women) were selected. The frequency of radiata infarct is 9.4% among cerebral infarct patients. The male/female ratio was 1.3. The mean age (SD) was 68.9 (9.5) years. The number of patients was 23 in Group A, 19 in Group B and 17 in Group C. Group B patients needed aid in their daily life, when compared to Group A and Group C. The cerebrovascular risk profiles demonstrated hypertension in 43 patients (72.9%), diabetes mellitus in 15 (25.4%), current smoking in 22 (37.3%), dyslipidemia in 16 (27.1%) and arterial fibrillation in 11 (18.6%). The clinical subtypes revealed 48 patients with lacunar infarct and 11 with cardiogenic emboli. The somatotopical distribution of motor fibers of Groups A to C was arranged in antero-posterior order. There were 24 patients with right lesions and 35 with left lesions. The size of the left infarcts was significantly smaller than that of the right infarcts. The clinical outcome of patients with arm-dominant weakness was relatively poor as compared to that of patients with dysarthria or leg-dominant weakness. The neuroradiological data suggest that left radiata infarct is smaller and more frequent than right infarct. (author)

  13. Clinicoradiological study on 59 patients with pure motor hemiparesis due to corona radiata infarcts

    Energy Technology Data Exchange (ETDEWEB)

    Nagaoka, Tetsuro; Kawabe, Kiyokazu; Ito, Hirono; Ikeda, Ken [Toho Univ., Omori Medical Center, Tokyo (Japan)

    2009-07-15

    To evaluate the clinicoradiological findings of patients with small infarction at the level of the corona radiata, such patients were divided into three groups: Group A (facio-lingual weakness), Group B (arm-dominant weakness) and Group C (leg-dominant weakness). The anteroposterior position and maximum diameter of the radiata infarcts were assessed by axial T2-weighted imaging. In total, 59 consecutive patients (42 men and 17 women) were selected. The frequency of radiata infarct is 9.4% among cerebral infarct patients. The male/female ratio was 1.3. The mean age (SD) was 68.9 (9.5) years. The number of patients was 23 in Group A, 19 in Group B and 17 in Group C. Group B patients needed aid in their daily life, when compared to Group A and Group C. The cerebrovascular risk profiles demonstrated hypertension in 43 patients (72.9%), diabetes mellitus in 15 (25.4%), current smoking in 22 (37.3%), dyslipidemia in 16 (27.1%) and arterial fibrillation in 11 (18.6%). The clinical subtypes revealed 48 patients with lacunar infarct and 11 with cardiogenic emboli. The somatotopical distribution of motor fibers of Groups A to C was arranged in antero-posterior order. There were 24 patients with right lesions and 35 with left lesions. The size of the left infarcts was significantly smaller than that of the right infarcts. The clinical outcome of patients with arm-dominant weakness was relatively poor as compared to that of patients with dysarthria or leg-dominant weakness. The neuroradiological data suggest that left radiata infarct is smaller and more frequent than right infarct. (author)

  14. PHYSIOLOGICAL RESPONSES OF ECKLONIA RADIATA (LAMINARIALES) TO A LATITUDINAL GRADIENT IN OCEAN TEMPERATURE

    DEFF Research Database (Denmark)

    Stæhr, Peter Anton; Wernberg, Thomas

    2009-01-01

    We tested the ability of sporophytes of a small kelp, Ecklonia radiata (C. Agardh) J. Agardh, to adjust their photosynthesis, respiration, and cellular processes to increasingly warm ocean climates along a latitudinal gradient in ocean temperature (~4°C). Tissue concentrations of pigment and nutr......We tested the ability of sporophytes of a small kelp, Ecklonia radiata (C. Agardh) J. Agardh, to adjust their photosynthesis, respiration, and cellular processes to increasingly warm ocean climates along a latitudinal gradient in ocean temperature (~4°C). Tissue concentrations of pigment...... and nutrients decreased with increasing ocean temperature. Concurrently, a number of gradual changes in the metabolic balance of E. radiata took place along the latitudinal gradient. Warm-acclimatized kelps had 50% lower photosynthetic rates and 90% lower respiration rates at the optimum temperature than did...... cool-acclimatized kelps. A reduction in temperature sensitivity was also observed as a reduction in Q10-values from cool- to warm-acclimatized kelps for gross photosynthesis (Q10: 3.35 to 1.45) and respiration (Q10: 3.82 to 1.65). Respiration rates were more sensitive to increasing experimental...

  15. Visual Grading and Structural Properties Assessment of Large Cross-Section Pinus radiata D. Don Timber

    Directory of Open Access Journals (Sweden)

    Eva Hermoso Prieto

    2016-04-01

    Full Text Available The use of large cross-section timber for structural purposes has increased in Spain, and knowledge of its properties is strategically necessary. The Spanish visual strength-grading standard UNE 56544 (2011 efficiency applied to large cross-section structural timber was analyzed using a sample of 363 specimens of radiata pine (Pinus radiata D. Don. from the Basque Country and Catalonia, Spain. Different sizes were tested (80 × 120 × 2400 mm3, 150 × 250 × 5600 mm3, 150 × 250 × 4300 mm3, and 200 × 250 × 5000 mm3. Bending strength, modulus of elasticity, and density were obtained, and characteristic values were determined in order to assign strength class according to European standard EN 338 (2010. Knots and twists were the most relevant singularities for visual strength grading. It was concluded that large cross-section Spanish radiata pine timber was suitable for structures, and it was assigned to the C20 strength class.

  16. Enhancing Growth of Vigna radiata in the Presence of Pseudomonas aeruginosa Biopolymer and Metarhizium anisopliae Spores

    Directory of Open Access Journals (Sweden)

    Bhagwan N. Rekadwad

    2016-01-01

    Full Text Available Exopolysaccharide producing Pseudomonas aeruginosa NCIM 2945 (PANCL belonging to gamma-proteobacterium and entomopathogenic fungus Metarhizium anisopliae MCC 1129 (MAMCC belonging to Ascomycota were studied for their morphological features biochemical characteristics and plant growth promotion ability. Optimum growth of PANCL was recorded after 24 h at temperature 30°C and pH 7.0. Gram-negative PANCL appeared as white in color, one mm size, circular, opaque, and nonconsistent elevated colonies with entire margin. It has utilized dextrose, fructose, maltose, and sorbitol as carbon source and produced acid in the medium. PANCL was sensitive to Polymyxin B (300 µgm/disc followed by Neomycin (30 µgm/disc, Gentamycin (10 µgm/disc, and Chloramphenicol (30 µgm/disc. PANCL has secreted extracellular lipase, amylase, protease, and exopolysaccharides (EPS. Another fungal strain MAMCC sporulated after 168 h at temperature 30°C and pH 7.0. MAMCC has septate-white mycelium and bears dirty green colored spores. Growth of MAMCC was enhanced in the presence of Neem and Karela-Amla oil (0.1 mL each. Extracellular polysaccharide produced by PANCL and spores of MAMCC promoted growth of dicotyledon Vigna radiata (Mung individually as well as in consortium. Considerable increase in dry weight of Vigna radiata was recorded. Thus, reported PANCL and MAMCC strains have promoted growth Vigna radiata and may be a solution for sustainable agriculture.

  17. Proanthocyanidin-rich Pinus radiata bark extract inhibits mast cell-mediated anaphylaxis-like reactions.

    Science.gov (United States)

    Choi, Yun Ho; Song, Chang Ho; Mun, Sung Phil

    2018-02-01

    Mast cells play a critical role in the effector phase of immediate hypersensitivity and allergic reactions. Pinus radiata bark extract exerts multiple biological effects and exhibits immunomodulatory and antioxidant properties. However, its role in mast cell-mediated anaphylactic reactions has not been thoroughly investigated. In this study, we examined the effects of proanthocyanidin-rich water extract (PAWE) isolated from P. radiata bark on compound 48/80-induced or antidinitrophenyl (DNP) immunoglobulin E (IgE)-mediated anaphylaxis-like reactions in vivo. In addition, we evaluated the mechanism underlying the inhibitory effect of PAWE on mast cell activation, with a specific focus on histamine release, using rat peritoneal mast cells. PAWE attenuated compound 48/80-induced or anti-DNP IgE-mediated passive cutaneous anaphylaxis-like reactions in mice, and it inhibited histamine release triggered by compound 48/80, ionophore A23187, or anti-DNP IgE in rat peritoneal mast cells in vitro. Moreover, PAWE suppressed compound 48/80-elicited calcium uptake in a concentration-dependent manner and promoted a transient increase in intracellular cyclic adenosine-3',5'-monophosphate levels. Together, these results suggest that proanthocyanidin-rich P. radiata bark extract effectively inhibits anaphylaxis-like reactions. Copyright © 2017 John Wiley & Sons, Ltd.

  18. Conector de cisalhamento tipo pino com cabeça para viga mista aço-concreto com laje alveolar

    OpenAIRE

    Sales, Marcel Willian Reis

    2014-01-01

    As vigas mistas de aço e concreto são estudadas há bastante tempo. O mecanismo de transferência de tensões de cisalhamento longitudinais pela interface entre a viga e a laje normalmente se dá por meio de conectores de cisalhamento. Nesse caso, o comportamento conjunto dos dois materiais depende da resistência e da rigidez do conector na interface, sendo bem conhecido para os conectores do tipo pino com cabeça associados com laje maciça de concreto. Entretanto, há pouca informaç...

  19. Análise do fluxo de material no processo de soldagem por fricção com pino consumível

    OpenAIRE

    Renan Mensch Landell

    2016-01-01

    Em substituição aos processos de reparo de defeitos por soldagem por arco elétrico, a Soldagem por Fricção com Pino Consumível ou Friction Hydro Pillar Processing (FHPP) vem sendo estudada devido a suas diversas vantagens sobre os processos convencionais de reparo. Isso se deve a não ocorrência de fusão do metal base e do metal de adição, ao reduzido tempo de processamento (inferior a um minuto, na maioria dos casos) e à possibilidade de automação do processo. Entretanto, por ser um processo ...

  20. THE ALLELOPATHIC EFFECT OF SHREDDED LEAVES OF ARTOCARPUS HETEROPHYLLUS AND A. ALTILIS ON VIGNA RADIATA L

    OpenAIRE

    Romilly Margaret Mendez* & Glaxy Ezekel.V

    2017-01-01

    In the present study, an attempt has been made to study the effect of Artocarpus heterophyllus Lam. and Artocarpus altilis (Parkinson) Fosberg on seed germination, seedling growth and total phenolic content of Vigna radiata L. The objective of this study is to assess the rate of germination, growth of the seedlings and the chlorophyll content of the cultivar seeds exposed to four concentrations (10 ppm, 1 ppm, 0.1 ppm and 0.01 ppm) of the leaf extracts of A. heterophyllus and A. altilis. I...

  1. Characterization of seasonal reproductive and stress steroid hormones in wild Radiated Tortoises, Astrochelys radiata.

    Science.gov (United States)

    Currylow, Andrea F T; Rafeliarisoa, Tsilavo H; Louis, Edward E; Stanford, Craig B; Randrianjafizanaka, Soary T; Chinn, Sarah M; Crocker, Daniel E

    2017-11-01

    The critically endangered Radiated Tortoise (Astrochelys radiata) is endemic to the southern coastlines of Madagascar. Once common, wild populations of this tortoise have undergone dramatic declines in recent years. Although there have been studies documenting reproductive activities, reproductive physiological parameters are unknown yet may be crucial in the recovery of the species. Over four research seasons in remote field locations native to A. radiata, we surveyed for, radio-tracked, and sampled wild, free ranging tortoises. We sampled and measured stress and reproductive parameters (corticosterone [CORT], testosterone [T], estradiol-17β [E2], and progesterone [P]) in 311 plasma samples from 203 wild A. radiata, capturing their active period. Generally, hormone concentrations were associated with body condition, temperature, and humidity. There was wide variation in CORT that varied monthly and by group. Juvenile tortoises maintained more than twice the mean basal CORT concentrations than either adult sex, with the most dramatic distinctions in the middle of the wet season. For adult sex hormones, the last months of the dry season and into the wet season when ground humidities are low and just begin to rise prior to temperature declines, male T concentrations gradually increased to a peak before returning to near undetectable values into the dry season. We had limited data for T concentrations in females, but found average T concentrations were much lower than in males and positively correlated with larger female home range sizes. For female hormone cycles, E2 also peaked in the early 1/3 of the wet season along with male T, and was followed by an uptick in P which correlates to the putative ovulatory cycle. Females tracked over four years showed variation in patterns of P, indicating that number and frequency of clutches vary. Our results suggest that 1) there is high species plasticity in response to stress; 2) A. radiata reproductive cycling is somewhat

  2. Lactarius deliciosus and Pinus radiata in New Zealand: towards the development of innovative gourmet mushroom orchards.

    Science.gov (United States)

    Guerin-Laguette, Alexis; Cummings, Nicholas; Butler, Ruth Catherine; Willows, Anna; Hesom-Williams, Nina; Li, Shuhong; Wang, Yun

    2014-10-01

    The cultivation of Lactarius deliciosus (saffron milk cap) in New Zealand began in 2002 when fruiting bodies were produced in an Otago plantation of Pinus radiata seedlings artificially mycorrhized by L. deliciosus. In 2007, 42 P. radiata seedlings mycorrhized by L. deliciosus under controlled conditions were planted in a grass field at Plant and Food Research (Lincoln, Canterbury). The effects of pine bark mulch application and initial degree of mycorrhization of seedlings were examined to determine their influence on tree growth, development of mycorrhizae (i.e. their multiplication on the root system and their degree of branching) and fruiting body production. Mulch application increased tree growth significantly over 4 years. High initial mycorrhization slightly stimulated tree growth over 2 years. The initial degree of mycorrhization was positively, but not strongly, related to the persistence and development of L. deliciosus mycorrhizae and rhizomorphs based on root sample analyses 2 years after planting. However, mulching strongly reduced the proportion of highly branched L. deliciosus mycorrhizae compared with poorly ramified ones. A positive correlation was observed between the fruiting of L. deliciosus and the development of mycorrhizae. Mulching delayed the onset of fruiting body production. In 2010, fruiting bodies were produced only from non-mulched trees with eight of these (38 %) producing a total of 12 fruiting bodies. In 2011, 19 non-mulched trees (90 %) and 9 mulched trees (45 %) produced 143 and 47 fruiting bodies, respectively, totalling 190 fruiting bodies. By 2012, 19 non-mulched trees (90 %) and 13 mulched trees (65 %) produced 333 and 236 fruiting bodies, respectively, totalling 569 fruiting bodies (c. 30 kg). This study presents new information on factors influencing the onset of fruiting and the development of yields in a plantation of P. radiata mycorrhized by L. deliciosus. Projected yields as high as c. 300 kg/ha from the

  3. Induction of chlorophyll chimeras and chlorophyll mutations in mungbean (Vigna radiata) cv. T44

    International Nuclear Information System (INIS)

    Singh, V.P.; Yadav, R.D.S.

    1993-01-01

    Uniform and healthy seeds of mungbean (Vigna radiata) cv. T44 were exposed to varying doses of gamma rays, ethyl methane sulphonate (EMS) and combination treatment of gamma rays with EMS. The data were recorded for seed germination, plant survival, frequency and spectrum of chlorophyll chimeras in M 1 and chlorophyll mutations in M 2 generation. Among all, the combination treatments were found most effective for inducing chlorophyll chimeras and chlorophyll mutations than the gamma rays or EMS alone. Of the mutants under reference, the albino, xantha and chlorina showed monogenic recessive while viridis exhibited digenic recessive inheritance. (author). 8 refs., 2 tabs

  4. Madera de compresión en Pinus radiata III: propiedades de pulpas kraft

    OpenAIRE

    Diaz-vaz,J.E; Ananias,R. A; Valenzuela,L; Torres,M; Rodriguez,S

    2012-01-01

    Estudios anteriores en estos mismos árboles de Pinus radiata con fustes levemente inclinados, demostraron que la madera de compresión leve que ellos exhibían presentaba: traqueidas más cortas, mayor densidad, mayor proporción de lignina, mayor proporción de extraíbles en etanol tolueno y menor proporción de alfa celulosa que la madera opuesta y que la madera de árboles sin madera de compresión. En el presente estudio se analiza las propiedades pulpables de la madera de compresión y la de sus ...

  5. Effect of chronic administration of Tamoxifen on fertility in male bonnet monkeys (Macaca radiata).

    Science.gov (United States)

    Rao, A J; Ramachandra, S G; Ramesh, V; Krishnamurthy, H N; Jayaraman, S; Gopalakrishnan, K; Juneja, H S

    1998-01-01

    Administration of Tamoxifen via the Alzet pump at a rate of 50 micrograms hr-1 for 90 days in the adult male bonnet monkeys Macaca radiata had no effect on the serum testosterone concentration determined at 10 AM and 10 PM as well as total sperm count determined at 15-day intervals over a period of 260 days. However, a significant reduction in sperm motility was observed beyond 90 days up until the 225th day. Breeding studies conducted from day 90 to 260 revealed that these males were infertile.

  6. Effect of Pinus radiata derived biochars on soil sorption and desorption of phenanthrene

    International Nuclear Information System (INIS)

    Zhang Honghua; Lin Kunde; Wang Hailong; Gan, Jay

    2010-01-01

    Biochars are anthropogenic carbonaceous sorbent and their influences on the sorption of environmental contaminants need to be characterized. Here we evaluated the effect of Pinus radiata derived biochars on soil sorption and desorption of phenanthrene. Two biochars separately produced at 350 o C and 700 o C and three soils were tested. Biochar amendment generally enhanced the soil sorption of phenanthrene. The biochar produced at 700 o C generally showed a greater ability at enhancing a soil's sorption ability than that prepared at 350 o C. The single-step desorption measurement showed an apparent hysteresis in biochar-amended soils. After 28 d equilibration, the sorptive capacity of biochar-amended soil (with an organic carbon content of 0.16%) significantly decreased. This study clearly suggested that biochar application enhanced soil sorption of hydrophobic organic compounds, but the magnitude of enhancement depended on the preparation of biochars, the indigenous soil organic carbon levels, and the contact time between soil and biochar. - Pinus radiata derived biochars influence soil sorption and desorption of phenanthrene.

  7. 28-Homobrassinolide mitigates boron induced toxicity through enhanced antioxidant system in Vigna radiata plants.

    Science.gov (United States)

    Yusuf, Mohammad; Fariduddin, Qazi; Ahmad, Aqil

    2011-11-01

    The objective of this study was to establish relationship between boron induced oxidative stress and antioxidant system in Vigna radiata plants and also to investigate whether brassinosteroids will enhance the level of antioxidant system that could confer tolerance to the plants from the boron induced oxidative stress. The mung bean (V. radiata cv. T-44) plants were administered with 0.50, 1.0 and 2.0 mM boron at 6 d stage for 7 d along with nutrient solution. At 13 d stage, the seedlings were sprayed with deionized water (control) or 10(-8) M of 28-homobrassinolide and plants were harvested at 21 d stage to assess growth, leaf gas-exchange traits and biochemical parameters. The boron treatments diminished growth, water relations and photosynthetic attributes along with nitrate reductase and carbonic anhydrase activity in the concentration dependent manner whereas, it enhanced lipid peroxidation, electrolyte leakage, accumulation of H(2)O(2) as well as proline, and various antioxidant enzymes in the leaves of mung bean which were more pronounced at higher concentrations of boron. However, the follow-up application of 28-homobrassinolide to the boron stressed plants improved growth, water relations and photosynthesis and further enhanced the various antioxidant enzymes viz. catalase, peroxidase and superoxide dismutase and content of proline. The elevated level of antioxidant enzymes as well as proline could have conferred tolerance to the B-stressed plants resulting in improved growth, water relations and photosynthetic attributes. Copyright © 2011 Elsevier Ltd. All rights reserved.

  8. Horse grazing systems: understory biomass and plant biodiversity of a Pinus radiata stand

    Directory of Open Access Journals (Sweden)

    Antonio Rigueiro-Rodríguez

    2012-02-01

    Full Text Available Horse grazing systems may affect productivity and biodiversity of understory developed under Pinus radiata D. Don silvopastoral systems, while acting as a tool to reduce the risk of fire. This study compared continuous and rotational grazing systems effect upon biomass, fractions of stem, sprouts, leaves and woody parts of Ulex europaeus L. and alpha (Species Richness, Shannon-Wiener and beta (Jaccard and Magurran biodiversity for a period of four years in a P. radiata silvopastoral system. The experiment consisted of a randomized block design of two treatments (continuous and rotational grazing. Biomass, and species abundances were measured - biodiversity metrics were calculated based on these results for a two years of grazing and two years of post-grazing periods. Both continuous and rotational grazing systems were useful tools for reducing biomass and, therefore, fire risk. The rotational grazing system caused damage to the U. europaeus shrub, limiting its recovery once grazing was stopped. However, the more intensive grazing of U. europaeus plants under rotational had a positive effect on both alpha and beta biodiversity indexes due to the low capacity of food selection in the whole plot rather than continuous grazing systems. Biomass was not affected by the grazing system; however the rotational grazing system is more appropriate to reduce U. europaeus biomass and therefore forest fire risk at a long term and to enhance pasture biodiversity than the continuous grazing system.

  9. Biochemical Changes under Chromium Stress on Germinating Seedlings of Vigna radiata

    Directory of Open Access Journals (Sweden)

    Bhavin SUTHAR

    2014-03-01

    Full Text Available Hexavalant chromium is considered the most toxic form because of its high solubility in water. Cr is known to induce production of elevated concentration of reactive oxygen species (ROS resulted in macromolecule damage. Plants are having unique mechanisms to overcome ROS induced damage by accumulation of proline, ascorbate and glutathione and increasing the activities of antioxidant enzymes such as superoxide dismutase (SOD, catalase (CAT, glutathione reductase (GR, and ascorbate peroxidaes (APX, peroxidise (POX. In the present investigation effects of chromium on seed germination of Mung bean (Vigna radiata 'Gujarat Mung-4’ were studied. Seeds were treated with different Cr concentrations (50, 100, 150 and 200 4M for seven days. On 7th day root and shoot length was measured and activities of antioxidant enzyme SOD, APX, POX, CAT and GR were checked along with protein, proline and lipid peroxidation. It was observed that there is gradual decrease in shoot and root length with respect to the increase in Cr concentration. Level of lipid peroxidation significantly increased along with proline and antioxidant enzyme activity at higher Cr concentration. Lipid peroxidation is an indication of membrane damage due to elevated production of reactive oxygen species (ROS. To combat oxidative damage by ROS antioxidant enzyme activity increased significantly, which indicates that antioxidant enzymes (SOD, CAT, APX and GR play a crucial role during Cr stress during germination of V. radiata.

  10. Identification of Bradyrhizobium elkanii Genes Involved in Incompatibility with Vigna radiata

    Directory of Open Access Journals (Sweden)

    Hien P. Nguyen

    2017-12-01

    Full Text Available The establishment of a root nodule symbiosis between a leguminous plant and a rhizobium requires complex molecular interactions between the two partners. Compatible interactions lead to the formation of nitrogen-fixing nodules, however, some legumes exhibit incompatibility with specific rhizobial strains and restrict nodulation by the strains. Bradyrhizobium elkanii USDA61 is incompatible with mung bean (Vigna radiata cv. KPS1 and soybean cultivars carrying the Rj4 allele. Here, we explored genetic loci in USDA61 that determine incompatibility with V. radiata KPS1. We identified five novel B. elkanii genes that contribute to this incompatibility. Four of these genes also control incompatibility with soybean cultivars carrying the Rj4 allele, suggesting that a common mechanism underlies nodulation restriction in both legumes. The fifth gene encodes a hypothetical protein that contains a tts box in its promoter region. The tts box is conserved in genes encoding the type III secretion system (T3SS, which is known for its delivery of virulence effectors by pathogenic bacteria. These findings revealed both common and unique genes that are involved in the incompatibility of B. elkanii with mung bean and soybean. Of particular interest is the novel T3SS-related gene, which causes incompatibility specifically with mung bean cv. KPS1.

  11. Influencia de la poda en el desarrollo de masas de Pinus radiata D. Don y Pinus pinaster Aiton en Asturias

    OpenAIRE

    Hevia Cabal, Andrea

    2013-01-01

    Esta tesis evaluó la influencia de diferentes intensidades de poda sobre el crecimiento, desarrollo y persistencia de masas regulares jóvenes de Pinus radiata D. Don y Pinus pinaster Aiton en Asturias, dentro de una selvicultura sostenible enfocada a la producción de madera de calidad.

  12. Family-site interaction in Pinus radiata: implications for progeny testing strategy and regionalised breeding in New Zealand.

    Science.gov (United States)

    G.R. Johnson; R.D. Brudon

    1990-01-01

    A progeny test of 170 open-pollinated families from second-generation plus trees of Pinus radiata was established on four sites in New Zealand in 1981. Two test sites were on volcanic purnice soils in the Central North Island region and two were on phosphate-retentive clay soils in the Northland region.Assessments of volume growth, stem straightness, mal-...

  13. Comparison of traditional field retting and Phlebia radiata Cel 26 retting of hemp fibres for fibre-reinforced composites

    DEFF Research Database (Denmark)

    Liu, Ming; Ale, Marcel Tutor; Kołaczkowski, Bartłomiej

    2017-01-01

    Classical field retting and controlled fungal retting of hemp using Phlebia radiata Cel 26 (a mutant with low cellulose degrading ability) were compared with pure pectinase treatment with regard to mechanical properties of the produced fibre/epoxy composites. For field retting a classification...

  14. Leaf area index, biomass carbon and growth rate of radiata pine genetic types and relationships with LiDAR

    Science.gov (United States)

    Peter N. Beets; Stephen Reutebuch; Mark O. Kimberley; Graeme R. Oliver; Stephen H. Pearce; Robert J. McGaughey

    2011-01-01

    Relationships between discrete-return light detection and ranging (LiDAR) data and radiata pine leaf area index (LAI), stem volume, above ground carbon, and carbon sequestration were developed using 10 plots with directly measured biomass and leaf area data, and 36 plots with modelled carbon data. The plots included a range of genetic types established on north- and...

  15. Generation and analysis of expressed sequence tags from six developing xylem libraries in Pinus radiata D. Don

    Directory of Open Access Journals (Sweden)

    Dillon Shannon K

    2009-01-01

    Full Text Available Abstract Background Wood is a major renewable natural resource for the timber, fibre and bioenergy industry. Pinus radiata D. Don is the most important commercial plantation tree species in Australia and several other countries; however, genomic resources for this species are very limited in public databases. Our primary objective was to sequence a large number of expressed sequence tags (ESTs from genes involved in wood formation in radiata pine. Results Six developing xylem cDNA libraries were constructed from earlywood and latewood tissues sampled at juvenile (7 yrs, transition (11 yrs and mature (30 yrs ages, respectively. These xylem tissues represent six typical development stages in a rotation period of radiata pine. A total of 6,389 high quality ESTs were collected from 5,952 cDNA clones. Assembly of 5,952 ESTs from 5' end sequences generated 3,304 unigenes including 952 contigs and 2,352 singletons. About 97.0% of the 5,952 ESTs and 96.1% of the unigenes have matches in the UniProt and TIGR databases. Of the 3,174 unigenes with matches, 42.9% were not assigned GO (Gene Ontology terms and their functions are unknown or unclassified. More than half (52.1% of the 5,952 ESTs have matches in the Pfam database and represent 772 known protein families. About 18.0% of the 5,952 ESTs matched cell wall related genes in the MAIZEWALL database, representing all 18 categories, 91 of all 174 families and possibly 557 genes. Fifteen cell wall-related genes are ranked in the 30 most abundant genes, including CesA, tubulin, AGP, SAMS, actin, laccase, CCoAMT, MetE, phytocyanin, pectate lyase, cellulase, SuSy, expansin, chitinase and UDP-glucose dehydrogenase. Based on the PlantTFDB database 41 of the 64 transcription factor families in the poplar genome were identified as being involved in radiata pine wood formation. Comparative analysis of GO term abundance revealed a distinct transcriptome in juvenile earlywood formation compared to other stages of

  16. Susceptibility of Diaphorina citri (Hemiptera: Liviidae) and Its Parasitoid Tamarixia radiata (Hymenoptera: Eulophidae) to Entomopathogenic Fungi under Laboratory Conditions.

    Science.gov (United States)

    Ibarra-Cortés, K H; Guzmán-Franco, A W; González-Hernández, H; Ortega-Arenas, L D; Villanueva-Jiménez, J A; Robles-Bermúdez, A

    2018-02-01

    Diaphorina citri (Kuwayama) is a global pest of citrus that transmits the bacteria associated with the disease, Huanglongbing. Entomopathogenic fungi and the parasitoid Tamarixia radiata (Waterston) are important biological control agents of this pest and likely to interact in D. citri populations. As a basis for interaction studies, we determined the susceptibility of nymphs and adults of D. citri and adults of the parasitoid T. radiata to six fungal isolates from the species Beauveria bassiana s.l. (Bals.-Criv.) Vuill. (isolates B1 and B3), Metarhizium anisopliae s.s. (Metsch.) (Ma129 and Ma65) and Isaria fumosorosea Wize (I2 and Pae). We conducted experiments evaluating infection levels in all three insect groups following inoculation with a series of conidial concentrations (1 × 10 4 -1 × 10 8 conidia mL -1 ). Results showed that D. citri nymphs and T. radiata were more susceptible to fungal isolates than D. citri adults. Overall, B. bassiana and M. anisopliae isolates caused the greatest infection compared with I. fumosorosea isolates in all three groups of insects. Isolates B1 (B. bassiana) and Ma129 (M. anisopliae) infected a greater proportion of adults and nymphs of D. citri, respectively. Both isolates of B. bassiana caused greater infection in T. radiata compared with isolates of the other fungal species. We propose that isolates B1 and Ma129 are the strongest candidates for control of D. citri. Our results represent the first report of entomopathogenic fungi infecting T. radiata, and the basis for future studies to design a biological control programme that uses both agents more efficiently against D. citri populations.

  17. Lethal and Sublethal Impacts of Acaricides on Tamarixia radiata (Hemiptera: Eulophidae), an Important Ectoparasitoid of Diaphorina citri (Hemiptera: Liviidae).

    Science.gov (United States)

    Lira, A C S; Zanardi, O Z; Beloti, V H; Bordini, G P; Yamamoto, P T; Parra, J R P; Carvalho, G A

    2015-10-01

    The use of synthetic acaricides for management of pest mites may alter the efficacy of the ectoparasitoid Tamarixia radiata (Waterston) in biological control of Diaphorina citri Kuwayama, the vector of the bacteria associated with huanglongbing (HLB) in citrus orchards. We evaluated the toxicity of 16 acaricides that are recommended for the control of citrus-pest mites to T. radiata. Acrinathrin, bifenthrin, carbosulfan, and fenpropathrin caused high acute toxicity and were considered harmful (mortality >77%) to T. radiata. Abamectin, diflubenzuron, etoxazole, fenbutatin oxide, fenpyroximate, flufenoxuron, hexythiazox, propargite, spirodiclofen, and sulfur caused low acute toxicity and affected the parasitism rate and emergence rate of adults (F1 generation), and were considered slightly harmful to T. radiata. Dicofol and pyridaben did not affect the survival and action of the ectoparasitoid, and were considered harmless. In addition to its acute toxicity, carbosulfan caused mortality higher than 25% for >30 d after application, and was considered persistent. Acrinathrin, bifenthrin, fenpropathrin, fenpyroximate, propargite, and sulfur caused mortalities over 25% until 24 d after application and were considered moderately persistent; abamectin was slightly persistent, and fenbutatin oxide was short lived. Our results suggest that most acaricides used to control pest mites in citrus affect the density and efficacy of T. radiata in the biological control of D. citri. However, further evaluations are needed in order to determine the effect of these products on this ectoparasitoid under field conditions. © The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  18. Ecological impacts of long-term application of biosolids to a radiata pine plantation

    International Nuclear Information System (INIS)

    Xue, Jianming; Kimberley, Mark O.; Ross, Craig; Gielen, Gerty; Tremblay, Louis A.; Champeau, Olivier; Horswell, Jacqui; Wang, Hailong

    2015-01-01

    Assessment of the ecological impact of applying biosolids is important for determining both the risks and benefits. This study investigated the impact on soil physical, chemical and biological properties, tree nutrition and growth of long-term biosolids applications to a radiata pine (Pinus radiata D. Don) plantation growing on a Sandy Raw Soil in New Zealand. Biosolids were applied to the trial site every 3 years from tree age 6 to 19 years at three application rates: 0 (Control), 300 (Standard) and 600 (High) kg nitrogen (N) ha −1 , equivalent to 0, 3 and 6 Mg ha −1 of dry biosolids, respectively. Tree nutrition status and growth have been monitored annually. Soil samples were collected 13 years after the first biosolids application to assess the soil properties and functioning. Both the Standard and High biosolids treatments significantly increased soil (0–50 cm depth) total carbon (C), N, and phosphorus (P), Olsen P and cation exchange capacity (CEC), reduced soil pH, but had no significant effects on soil (0–20 cm depth) physical properties including bulk density, total porosity and unsaturated hydraulic conductivity. The High biosolids treatment also increased concentrations of soil total cadmium (Cd), chromium (Cr), copper (Cu) and lead (Pb) at 25–50 cm depth, but these concentrations were still considered very low for a soil. Ecotoxicological assessment showed no significant adverse effects of biosolids application on either the reproduction of springtails (Folsomia candida) or substrate utilisation ability of the soil microbial community, indicating no negative ecological impact of bisolids-derived heavy metals or triclosan. This study demonstrated that repeated application of biosolids to a plantation forest on a poor sandy soil could significantly improve soil fertility, tree nutrition and pine productivity. However, the long-term fate of biosolids-derived N, P and litter-retained heavy metals needs to be further monitored in the receiving

  19. Ecological impacts of long-term application of biosolids to a radiata pine plantation

    Energy Technology Data Exchange (ETDEWEB)

    Xue, Jianming, E-mail: jianming.xue@scionresearch.com [Scion, Private Bag 29237, Christchurch (New Zealand); Kimberley, Mark O., E-mail: mark.kimberley@scionresearch.com [Scion, Private Bag 3020, Rotorua (New Zealand); Ross, Craig, E-mail: rossc@landcareresearch.co.nz [Landcare, Private Bag 11052, Palmerston North (New Zealand); Gielen, Gerty, E-mail: gerty.gielen@scionresearch.com [Scion, Private Bag 3020, Rotorua (New Zealand); Tremblay, Louis A., E-mail: louis.tremblay@cawthron.org.nz [Cawthron Institute, Private Bag 2, Nelson (New Zealand); School of Biological Sciences, University of Auckland, PO Box 92019, Auckland 1142 (New Zealand); Champeau, Olivier, E-mail: olivier.champeau@cawthron.org.nz [Cawthron Institute, Private Bag 2, Nelson (New Zealand); Horswell, Jacqui, E-mail: jacqui.horswell@esr.cri.nz [ESR, P O Box 50-348, Porirua (New Zealand); Wang, Hailong, E-mail: hailong@zafu.edu.cn [Scion, Private Bag 3020, Rotorua (New Zealand); Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang Agricultural and Forestry University, Lin' an, Hangzhou, Zhejiang Province 311300 (China)

    2015-10-15

    Assessment of the ecological impact of applying biosolids is important for determining both the risks and benefits. This study investigated the impact on soil physical, chemical and biological properties, tree nutrition and growth of long-term biosolids applications to a radiata pine (Pinus radiata D. Don) plantation growing on a Sandy Raw Soil in New Zealand. Biosolids were applied to the trial site every 3 years from tree age 6 to 19 years at three application rates: 0 (Control), 300 (Standard) and 600 (High) kg nitrogen (N) ha{sup −1}, equivalent to 0, 3 and 6 Mg ha{sup −1} of dry biosolids, respectively. Tree nutrition status and growth have been monitored annually. Soil samples were collected 13 years after the first biosolids application to assess the soil properties and functioning. Both the Standard and High biosolids treatments significantly increased soil (0–50 cm depth) total carbon (C), N, and phosphorus (P), Olsen P and cation exchange capacity (CEC), reduced soil pH, but had no significant effects on soil (0–20 cm depth) physical properties including bulk density, total porosity and unsaturated hydraulic conductivity. The High biosolids treatment also increased concentrations of soil total cadmium (Cd), chromium (Cr), copper (Cu) and lead (Pb) at 25–50 cm depth, but these concentrations were still considered very low for a soil. Ecotoxicological assessment showed no significant adverse effects of biosolids application on either the reproduction of springtails (Folsomia candida) or substrate utilisation ability of the soil microbial community, indicating no negative ecological impact of bisolids-derived heavy metals or triclosan. This study demonstrated that repeated application of biosolids to a plantation forest on a poor sandy soil could significantly improve soil fertility, tree nutrition and pine productivity. However, the long-term fate of biosolids-derived N, P and litter-retained heavy metals needs to be further monitored in the

  20. Oviposition behavior and survival of Tamarixia radiata (Hymenoptera: Eulophidae), an ectoparasitoid of the Asian citrus psyllid, Diaphorina citri (Hemiptera: Liviidae), on hosts exposed to an entomopathogenic fungus

    Science.gov (United States)

    Antagonistic interactions between the nymphal parasitoid, Tamarixia radiata Waterston (Hymenoptera: Eulophidae), and the ARSEF 3581 isolate of the entomopathogenic fungus, Isaria fumosorosea Wize (Hypocreales: Cordycipitaceae) could disrupt biological control of the Asian citrus psyllid, Diaphorina ...

  1. EFECTO DE DOS MICROORGANISMOS Y UN CONSORCIO DE MICORRIZAS EN COMBINACIÓN CON VIRUTA DE PINO SOBRE EL CONTROL DE SARNA POLVOSA (Spongospora subterránea EN PAPA EFECT OF TWO MICROORGANISMS, MYCORHIZE AND PINE WOOD SHAVINGS ON THE CONTROL OF POWDERY SCAB (Spongospora subterranea IN POTATO

    Directory of Open Access Journals (Sweden)

    Andrés Felipe Restrepo Duque

    2009-12-01

    Full Text Available Se evaluaron los efectos de dos biocontroladores potenciales, un consorcio de micorrizas y viruta de pino sobre el control de Spongospora subterranea f. sp. subterranea en papa Diacol Capiro muy susceptible a la sarna polvosa. El estudio se realizó en el Centro Agropecuario Paysandú, corregimiento de Santa Elena Medellín a 2.550 msnm, temperatura media de 14 ºC y precipitación promedio anual de 2.500 mm. Se utilizó un diseño completamente al azar con cuatro repeticiones y cinco tratamientos (Trichoderma harzianum; Producto comercial de micorrizas “Mikorhyze lote C7”; Pseudomonas fluorescents, viruta de pino y Testigo sin control. Se encontraron porcentajes de incidencia de la enfermedad en raíces (32% para el tratamiento testigo (sin control, aunque el porcentaje de severidad tanto del testigo como de los demás tratamientos fue bajo, el cual no superó el 0,23%. La expresión de síntomas en tubérculos mostró diferencias estadísticamente significativas entre el tratamiento testigo y la aplicación de T. harzianum, micorrizas y P. fluorescents a los tubérculos, al igual que la adición de la viruta de pino al suelo. Estos tratamientos redujeron la incidencia y severidad de la sarna polvosa en las raíces y tubérculos. Las variables fisiológicas peso seco de raíces, peso de tubérculos y peso seco de la parte aérea, no presentaron incrementos positivos ni diferencias significativas entre los tratamientos evaluados.The effect of two potential microorganism, mycorhize and pine wood shavings for management of Spongospora subterranea f. sp. subterranea in potato cultivar DIACOL Capiro were evaluated. This research was established at the Agricultural Center of Paysandú (Santa Elena - Medellín to 2,550 masL, average temperature of 14 ºC and average annual rainfall of 2,500 mm. A field experiment was established using a randomized complete design with four replications and five treatments (Trichoderma harzianum; Comercial product

  2. EFFECTIVENESS OF A SUPERFICIAL TREATMENT USING BIFENTHRIN TO PROTECT RADIATA PINE FRAMING FROM DAMAGE BY SUBTERRANEAN AND DRYWOOD TERMITES IN INDONESIA

    OpenAIRE

    Paimin Sukartana; Jim W. Creffield; Agus Ismanto; Neo E. Lelana; Rusti Rushelia

    2010-01-01

    Various experimental testing procedures were undertaken in Indonesia to determine the effectiveness of a patented superficial (envelope) treatment using bifenthrin to protect radiata pine framing material from damage by two species of subterranean termites (Macrotermes gilvus and Coptotermes curvignathus) and one species of drywood termite (Cryptotermes cynocephalus). Lengths of framing material (Pinus radiata sapwood) were commercially treated to the targeted retention of 0.02% m/m of bifent...

  3. Utilization of Diamine Oxidase Enzyme from Mung Bean Sprouts (Vigna radiata L) for Histamine biosensors

    Science.gov (United States)

    Karim, Abdul; Wahab, A. W.; Raya, I.; Natsir, H.; Arif, A. R.

    2018-03-01

    This research is aimed to utilize the diamine oxidase enzyme (DAO) which isolated from mung bean sprouts (Vigna radiata L) to develop histamine biosensors based on electode enzyme with the amperometric method (cyclic voltammetry).The DAO enzyme is trapped inside the membrane of chitin-cellulose acetate 2:1 and glutaraldehyde which super imposed on a Pt electrode. Histamine will be oxidized by DAO enzyme to produce aldehydes and H2O2 that acting as electron transfer mediators.The performance of biosensors will be measured at various concentrations of glutaraldehyde, temperature changes and different range of pH. Recently, it has been found that the optimal conditions obtained from the paramaters as follows; at 25% of glutaraldehyde, temperature of 37°C and pH of 7.4. Eventually, the results provided an expectation for applying histamine biosensors in determining the freshness and safety of fish specifically skombroidae families.

  4. Phase-change related epigenetic and physiological changes in Pinus radiata D. Don.

    Science.gov (United States)

    Fraga, Mario F; Cañal, Maria Jesús; Rodríguez, Roberto

    2002-08-01

    DNA methylation and polyamine levels were analysed before and after Pinus radiata D. Don. phase change in order to identify possible molecular and physiological phase markers. Juvenile individuals (without reproductive ability) were characterised by a degree of DNA methylation of 30-35% and a ratio of free polyamines to perchloric acid-soluble polyamine conjugates greater than 1, while mature trees (with reproductive ability) had 60% 5-methylcytosine and a ratio of free polyamines to perchloric acid-soluble polyamine conjugates of less than 1. Results obtained with trees that attained reproductive capacity during the experimental period confirmed that changes in the degree of DNA methylation and polyamine concentrations found among juvenile and mature states come about immediately after the phase change. We suggest that both indicators may be associated with the loss of morphogenic ability during ageing, particularly after phase change, through a number of molecular interactions, which are subsequently discussed.

  5. Genomic DNA methylation-demethylation during aging and reinvigoration of Pinus radiata.

    Science.gov (United States)

    Fraga, Mario F; Rodríguez, Roberto; Cañal, Maria Jesús

    2002-08-01

    In animals, DNA methylation is related to gene silencing during ontogenic development. Little is known about DNA methylation in plants, although occasional changes in the DNA methylation state of specific gene promoters have been reported in angiosperms during some developmental processes. We found large differences in the extent of DNA methylation between meristematic areas of juvenile and mature Pinus radiata D. Don. trees, whereas differences in the extent of DNA methylation between differentiated tissues of juvenile and mature trees were small. In meristematic areas, there was a gradual decrease in extent of DNA methylation as the degree of reinvigoration increased. The observed changes in extent of DNA methylation during aging and reinvigoration indicate that reinvigoration could be a consequence of epigenetic modifications opposite in direction to those that occur during aging.

  6. Yield and Quality of Mung Bean (Vigna radiata (l. R. Wilczek Seeds Produced in Poland

    Directory of Open Access Journals (Sweden)

    Kamil MISIAK

    2017-11-01

    Full Text Available The aim of the experiment was to do field and laboratory assessments of yield and quality of mung bean (Vigna radiata (L. R. Wilczek seeds cultivated in Western Poland. Mean yield of seeds per plant was higher for common bean (Phaseolus vulgaris L. than for mung one: 13.1 g and 2.58 g, respectively. The mean 1000 mung seeds weight was 50.9 g and their germination – 78 %. Germination capacities of seeds of both beans in the field were similar. Mung beans, compared to common bean, had much smaller seeds, started to bloom later and produced mature seeds later than the latter. Mung bean seeds had more total proteins and Magnesium and Copper than common bean seeds. In Western Poland, production of high quality mung bean seeds was possible.

  7. Biogenic synthesis and spatial distribution of silver nanoparticles in the legume mungbean plant (Vigna radiata L.).

    Science.gov (United States)

    Kumari, Rima; Singh, Jay Shankar; Singh, Devendra Pratap

    2017-01-01

    The present investigation aimed to study the in vivo synthesis of silver nanoparticles (AgNPs) in the legume Vigna radiata. The level of plant metabolites such as total phenolics, lipid, terpenoids, alkaloids and amino acid increased by 65%, 133%, 19%, 67% and 35%, respectively, in AgNO 3 (100 mg L -1 ) treated plants compared to control. Whereas protein and sugar contents in the treated plants were reduced by 38% and 27%, respectively. FTIR analysis of AgNO 3 (20-100 mg L -1 ) treated plants exhibited changes in the IR regions between 3297 and 3363 cm -1 , 1635-1619 cm -1 , 1249-1266 cm -1 and that corresponded to alterations in OH groups of carbohydrates, OH and NH groups of amide I and II regions of protein, when compared with the control. Transmission electron micrographs showed the spatial distribution of AgNPs in the chloroplast, cytoplasmic spaces, vacuolar and nucleolar plant regions. Metal quantification in different tissues of plants exposed to 20-100 mg L -1 AgNO 3 showed about a 22 fold accumulation of Ag in roots as compared to shoots. The phytotoxic parameters such as percent seed germination and shoot elongation remained almost unaltered at low AgNO 3 doses (20-50 mg L -1 ). However, at higher levels of exposure (100 mg L -1 ), the percent seed germination as well as root and shoot elongation exhibited concentration dependent decline. In conclusion, synthesis of AgNPs in V. radiata particularly at lower doses of AgNO 3 , could be used as a sustainable and environmentally safe technology for large scale production of metal nanoparticles. Copyright © 2016 Elsevier Masson SAS. All rights reserved.

  8. Anatomical aspects of the male reproductive system in the bonnet monkey (Macaca radiata).

    Science.gov (United States)

    Prakash, S; Suresh, S; Prithiviraj, E

    2009-04-01

    The normal anatomy of the male reproductive system in Macaca radiata is presented here. The external genitalia consist of a triangular button-shaped glans penis. The corpus cavernosum, and spongiosum form the vascular component of the penis and the baculum or os penis forms the non-vascular erectile component. The baculum is one of the longest in the genus macaques. The scrotal sac is non-pigmented, slightly pendulous, with scattered hairs, faintly corrugated, and does not reach the ischial callosities in the sitting posture. The testicles are ovoid in shape without appendix. Right and left testicular arteries originate at the level of the inter-vertebral disc between T12-L1 and L2-L3, respectively. Seminiferous tubules present mixed stages of spermatogenesis, i.e. single/multistage. The epididymis is crescent shaped, attached to the postero-lateral border of the testis without an appendix. Light microscopic observation revealed a characteristic high columnar epithelium with stereocilia. Clear cells or light cells are seen in the caudal region. The ductus deferens display a lumen lined by pseudo-stratified columnar epithelium separated by concentric layers of smooth muscle cells covered by serosa. The seminal vesicles are pyramidal in shape, prominently projecting above the urinary bladder, and are the largest of the accessory glands, typical of polyandrous primate genera. The prostate is conical in shape. Its base is in contact with the trigone of the bladder. Its posterior surface shows a transverse cleft separating an upper quarter, the cranial lobe, from the lower three-quarters of the gland. Compared with other macaques there are many distinguishing features in M. radiata. Excellent adaptability and spermatogenic efficiency in the laboratory environment makes this animal a good primate model for andrological research.

  9. Metabolites and hormones are involved in the intraspecific variability of drought hardening in radiata pine.

    Science.gov (United States)

    De Diego, N; Saiz-Fernández, I; Rodríguez, J L; Pérez-Alfocea, P; Sampedro, M C; Barrio, R J; Lacuesta, M; Moncaleán, P

    2015-09-01

    Studies of metabolic and physiological bases of plant tolerance and hardening against drought are essential to improve genetic breeding programs, especially in productive species such as Pinus radiata. The exposure to different drought cycles is a highly effective tool that improves plant conditioning, but limited information is available about the mechanisms that modulate this process. To clarify this issue, six P. radiata breeds with well-known differences in drought tolerance were analyzed after two consecutive drought cycles. Survival rate, concentration of several metabolites such as free soluble amino acids and polyamines, and main plant hormones varied between them after drought hardening, while relative growth ratio and water potential at both predawn and dawn did not. Hardening induced a strong increase in total soluble amino acids in all breeds, accumulating mainly those implicated in the glutamate metabolism (GM), especially L-proline, in the most tolerant breeds. Other amino acids from GM such as γ-aminobutyric acid (GABA) and L-arginine (Arg) were also strongly increased. GABA pathway could improve the response against drought, whereas Arg acts as precursor for the synthesis of spermidine. This polyamine showed a positive relationship with the survival capacity, probably due to its role as antioxidant under stress conditions. Finally, drought hardening also induced changes in phytohormone content, showing each breed a different profile. Although all of them accumulated indole-3-acetic acid and jasmonic acid and reduced zeatin content in needles, significant differences were observed regarding abscisic acid, salicylic acid and mainly zeatin riboside. These results confirm that hardening is not only species-dependent but also an intraspecific processes controlled through metabolite changes. Copyright © 2015 Elsevier GmbH. All rights reserved.

  10. Lethal and Sublethal Effects of Insecticides Used on Citrus, on the Ectoparasitoid Tamarixia radiata.

    Science.gov (United States)

    Beloti, Vitor Hugo; Alves, Gustavo Rodrigues; Araújo, Diogo Feliciano Dias; Picoli, Mateus Manara; Moral, Rafael de Andrade; Demétrio, Clarice Garcia Borges; Yamamoto, Pedro Takao

    2015-01-01

    Huanglongbing (HLB) is a disease associated with the bacteria "Candidatus Liberibacter spp." and has been devastating citrus orchards around the world. Its management involves control of the insect vector, the Asian citrus psyllid Diaphorina citri Kuwayama. However, the indiscriminate use of chemicals has caused pest outbreaks and eliminated the natural enemies of the vector, such as the parasitoid Tamarixia radiata (Waterston), the main agent for biological control of D. citri. This study assessed the lethal and sublethal effects of insecticides recommended for integrated production of citrus on the parasitoid T. radiata. When adult parasitoids were exposed to residues of 25 insecticides, 20% of them, i.e., gamma-cyhalothrin, etofenprox, azadirachtin, tebufenozide and pyriproxyfen, were considered as harmless (Class 1), 12% as slightly harmful (Class 2), 12% as moderately harmful (Class 3) and 56% as harmful (Class 4), according to the classification proposed by the IOBC/WPRS. Afterward, 14 insecticides (5 harmless and 9 harmful) were sprayed on the parasitoid pupae. Of the 14 insecticides tested, only the organophosphates dimethoate and chlorpyrifos affected the parasitoid emergence. The effects of insecticides on the parasitism capacity of adults exposed to residues of azadirachtin, etofenprox, gamma-cyhalothrin, pyriproxyfen and tebufenozide (harmless) were also evaluated. Tebufenozide and gamma-cyhalothrin affected the parasitism of the F0 generation, but did not affect the emergence of the F1 and F2 generations. Therefore, for an effective IPM program, selective insecticides or harmful pesticides to adult parasitoids could be used in the field, provided that the adults do not occur naturally and the chemical applications do not coincide with parasitoid releases.

  11. Lethal and Sublethal Effects of Insecticides Used on Citrus, on the Ectoparasitoid Tamarixia radiata.

    Directory of Open Access Journals (Sweden)

    Vitor Hugo Beloti

    Full Text Available Huanglongbing (HLB is a disease associated with the bacteria "Candidatus Liberibacter spp." and has been devastating citrus orchards around the world. Its management involves control of the insect vector, the Asian citrus psyllid Diaphorina citri Kuwayama. However, the indiscriminate use of chemicals has caused pest outbreaks and eliminated the natural enemies of the vector, such as the parasitoid Tamarixia radiata (Waterston, the main agent for biological control of D. citri. This study assessed the lethal and sublethal effects of insecticides recommended for integrated production of citrus on the parasitoid T. radiata. When adult parasitoids were exposed to residues of 25 insecticides, 20% of them, i.e., gamma-cyhalothrin, etofenprox, azadirachtin, tebufenozide and pyriproxyfen, were considered as harmless (Class 1, 12% as slightly harmful (Class 2, 12% as moderately harmful (Class 3 and 56% as harmful (Class 4, according to the classification proposed by the IOBC/WPRS. Afterward, 14 insecticides (5 harmless and 9 harmful were sprayed on the parasitoid pupae. Of the 14 insecticides tested, only the organophosphates dimethoate and chlorpyrifos affected the parasitoid emergence. The effects of insecticides on the parasitism capacity of adults exposed to residues of azadirachtin, etofenprox, gamma-cyhalothrin, pyriproxyfen and tebufenozide (harmless were also evaluated. Tebufenozide and gamma-cyhalothrin affected the parasitism of the F0 generation, but did not affect the emergence of the F1 and F2 generations. Therefore, for an effective IPM program, selective insecticides or harmful pesticides to adult parasitoids could be used in the field, provided that the adults do not occur naturally and the chemical applications do not coincide with parasitoid releases.

  12. Improvement of non-key traits in radiata pine breeding programme when long-term economic importance is uncertain.

    Science.gov (United States)

    Li, Yongjun; Dungey, Heidi; Yanchuk, Alvin; Apiolaza, Luis A

    2017-01-01

    Diameter at breast height (DBH), wood density (DEN) and predicted modulus of elasticity (PME) are considered as 'key traits' (KT) in the improvement in radiata pine breeding programmes in New Zealand. Any other traits which are also of interest to radiata pine breeders and forest growers are called 'non-key traits' (NKTs). External resin bleeding (ERB), internal checking (IC), number of heartwood rings (NHR) are three such non-key traits which affect wood quality of radiata pine timber. Economic importance of the KTs and NKTs is hard to define in radiata pine breeding programmes due to long rotation period. Desired-gain index (DGIs) and robust selection were proposed to incorporate NKTs into radiata pine breeding programme in order to deal with the uncertainty of economic importance. Four desired-gain indices A-D were proposed in this study. The desired-gain index A (DGI-A) emphasized growth and led to small decrease in ERB and small increase in IC and NHR. The expected genetic gains of all traits in the desired-gain index B (DGI-B) were in the favourable directions (positive genetic gains in the key traits and negative genetic gains in the non-key traits). The desired-gain index C (DGI-C) placed emphasis on wood density, leading to favourable genetic gain in the NKTs but reduced genetic gains for DBH and PME. The desired-gain index D (DGI-D) exerted a bit more emphasis on the non-key traits, leading large favourable reduction in the non-key traits and lower increase in the key traits compared with the other DGIs. When selecting both the key traits and the non-key traits, the average EBVs of six traits were all in the same directions as the expected genetic gains except for DBH in the DGI-D. When the key traits were measured and selected, internal checking always had a negative (favourable) genetic gain but ERB and NHR had unfavourable genetic gain in the most of time. After removing some individuals with high sensitivity to the change of economic weights, robust

  13. Improvement of non-key traits in radiata pine breeding programme when long-term economic importance is uncertain.

    Directory of Open Access Journals (Sweden)

    Yongjun Li

    Full Text Available Diameter at breast height (DBH, wood density (DEN and predicted modulus of elasticity (PME are considered as 'key traits' (KT in the improvement in radiata pine breeding programmes in New Zealand. Any other traits which are also of interest to radiata pine breeders and forest growers are called 'non-key traits' (NKTs. External resin bleeding (ERB, internal checking (IC, number of heartwood rings (NHR are three such non-key traits which affect wood quality of radiata pine timber. Economic importance of the KTs and NKTs is hard to define in radiata pine breeding programmes due to long rotation period. Desired-gain index (DGIs and robust selection were proposed to incorporate NKTs into radiata pine breeding programme in order to deal with the uncertainty of economic importance. Four desired-gain indices A-D were proposed in this study. The desired-gain index A (DGI-A emphasized growth and led to small decrease in ERB and small increase in IC and NHR. The expected genetic gains of all traits in the desired-gain index B (DGI-B were in the favourable directions (positive genetic gains in the key traits and negative genetic gains in the non-key traits. The desired-gain index C (DGI-C placed emphasis on wood density, leading to favourable genetic gain in the NKTs but reduced genetic gains for DBH and PME. The desired-gain index D (DGI-D exerted a bit more emphasis on the non-key traits, leading large favourable reduction in the non-key traits and lower increase in the key traits compared with the other DGIs. When selecting both the key traits and the non-key traits, the average EBVs of six traits were all in the same directions as the expected genetic gains except for DBH in the DGI-D. When the key traits were measured and selected, internal checking always had a negative (favourable genetic gain but ERB and NHR had unfavourable genetic gain in the most of time. After removing some individuals with high sensitivity to the change of economic weights

  14. Vigna radiata

    Indian Academy of Sciences (India)

    Table 2. Cluster mean for different traits. Characters/ Days to 50% Days to Plant height Plant yield. 100-seed. Pods per Pods per Pod length Seeds per clusters flowering maturity. (cm). (gm) weight (gm) plant cluster. (cm) pod. Cluster I. 34.00. 6.20. 29.64. 4.89. 4.71. 13.15. 3.29. 6.69. 8.74. Cluster II. 35.17. 61.00. 31.29. 5.26.

  15. Bark polyflavonoids from Pinus radiata as functional building-blocks for polylactic acid (PLA-based green composites

    Directory of Open Access Journals (Sweden)

    D. E. Garcia

    2016-10-01

    Full Text Available Polylactic acid (PLA was melt-blended with Pinus radiata unmodified and modified (hydroxypropyled bark polyflavonoids in order to use such polyphenolic building-blocks as functional additives for envisaged applications. Rheological, morphological, molecular, thermal, and flexural properties were studied. Polyflavonoids improved blend processability in terms of short-time mixing. Furthermore, hydroxypropylated polyflavonoids improve miscibility in binary and ternary blends. Blend-composition affects crystallization-, melting-, and glass transition-temperature of PLA, as well as thermal resistance, and flexural properties of the blends. Polyflavonoids induced PLA-crystallization, and polymer-chain decomposition. Modified and unmodified bark polyflavonoids from radiata pine can be used successfully in PLA-based green composites beyond the food-packaging applications. The high compatibility between PLA and hydroxypropyled polyflavonoids highlights the potential of such phenolic derivatives for PLA-based material design.

  16. Characterization of moisture in acetylated and propionylated radiata pine using low-field nuclear magnetic resonance (LFNMR) relaxometry

    DEFF Research Database (Denmark)

    Beck, Greeley; Thybring, Emil Engelund; Thygesen, Lisbeth Garbrecht

    2018-01-01

    . A possible explanation is the counteracting effects of decreased hydrophilicity and reduced moisture content (MC) of these water populations at higher levels of acetylation. The evaluation of propionylation on WCW T2 data was complicated by peak splitting in the relaxation spectrum. Constant T2 values......Moisture in radiata pine (Pinus radiata D. Don) earlywood (EW), which was acetylated or propionylated to various degrees, was measured by low-field nuclear magnetic resonance (LFNMR) relaxometry. Spin-spin relaxation times (T2) were determined for fully saturated samples at 22 and -18°C. T2 values...... for EW lumen water increased with increasing acetylation weight percentage gain (WPG), perhaps caused by the less hydrophilic acetylated wood (AcW) surface. Cell wall water (WCW) and the water in pits and small voids also showed increasing T2 values as a function of WPG but with a weaker tendency...

  17. Estilos del arte rupestre en Cuba. Una nueva interpretación

    Directory of Open Access Journals (Sweden)

    Gerardo Izquierdo Díaz

    2010-10-01

    Full Text Available A partir del hallazgo de una cueva con pictografías en Isla de Pinos, en 1922, fecha anterior al descubrimiento de la caverna con dibujos rupestres de Lascoux, en Francia, se desató una fiebre por el estudio de esas célebres pinturas parietales entre arqueólogos y estudiosos de la historia y la cultura cubanas. Un alto nivel abstraccional de los pictogramas de la cueva no 1 de Punta del Este en Isla de Pinos, aparentemente no coincidente con la cultura a que aparecen asociados los dibujos, planteó un enigma acerca del Arte rupestre de los aborígenes del País que ha llegado indemne prácticamente hasta el presente. Estudios precedentes de destacadas personalidades de la ciencia han permitido, gracias a su sistematicidad, una base de datos que es utilizada por los autores del presente trabajo para una contrastación de las tendencias de desarrollo del arte rupestre en Cuba mediante métodos computarizados.Los conceptos propios de la pintura y el arte plástico en general, en el estudio de estas manifestaciones en el País, son reenfocados con criterios homogéneos y el rigor científico necesario. Igualmente las referencias al nivel de desarrollo sociocultural de las comunidades aborígenes que se han supuesto sus autores, requirieron de un tratamiento especial de acuerdo con los conocimientos más actualizados sobre la arqueología en el momento de la realización del estudio; todo ello con el fin de deslindar objetivamente los endebles nexos entre autor y obra propios del arte rupestre. Los análisis desarrollados posibilitaron comprobar que los conceptos de figuración y abstracción en las comunidades aborígenes de Cuba concuerdan con las distintas fases de los procesos de “neolitización” en que aquellas se encontraban; y Punta del Este en Isla de Pinos es un caso particular que, no obstante, se enmarca coherentemente en un proceso de esta naturaleza. Pudo constatarse, asimismo, que la relación de las cuevas con su entorno influy

  18. EFFECT OF THE REACTION CONDITIONS OVER THE YIELD AND PROPERTIES OF METHYLCELLULOSE OBTAINED FROM PINUS RADIATA KRAFT BLEACHED CELLULOSE

    OpenAIRE

    TAPIA, C.; SAPAG-HAGAR, J.; ANDRADE, C.T.; HASSÓN, J.; VALENZUELA, F.; BASUALTO, C.

    2002-01-01

    Kraft bleached cellulose from Pinus radiata was submitted to methylation reactions in heterogeneous media. After activation with 29% (w/w) NaOH solution, methylation reactions were carried out both with dimethyl sulfate (DMS) and methyl iodide (MI). The effects of the pressing ratio, reaction time and type of methylation agent were studied. The better yields were obtained with dimethylsulphate and the pressing ratio and reaction time were not signficant over the yield. Methylcellulose (MC) of...

  19. First report of shoot blight and dieback caused by Diplodia pinea on Pinus pinaster and P. radiata trees in Tunisia

    Directory of Open Access Journals (Sweden)

    B.T. Linaldeddu

    2009-01-01

    Full Text Available Damage caused by Diplodia pinea on Pinus pinaster and P. radiata forests are reported for the fi rst time in Tunisia. The affected plants show shoot blight, canker and branch dieback. On decaying and dead branches pycnidia of D. pinea are observed. The fungus was repeatedly isolated from the bark of symptomatic branches. The results of pathogenicity tests confirm the virulence of D. pinea and the susceptibility of both Pinus species to infection.

  20. Arquitectura contemporánea en rollizo en las regiones del Bío-Bío y La Araucanía

    Directory of Open Access Journals (Sweden)

    Rodrigo Villalobos P.

    1997-05-01

    Full Text Available En la regiones del Bío-Bío y de la Araucanía se ha observado en el transcurso de los últimos años, un notorio desarrollo de arquitectura en rollizo de pino. Hasta ahora la historia arquitectónica del sur del país no había mostrado un masivo empleo del rollizo y los ejemplos existentes eran más bien aislados, como el caso del Fuerte Bulnes en la Patagonia Austral o la arquitectura tradicional mapuche en que los troncos de madera fueron utilizados como estructura. A diferencia de los Estados Unidos y Canadá, en que apareció arquitectura en rollizo desde los tiempos de la conquista del Oeste.

  1. Balanceo de un sistema de cosecha mecanizado utilizando simulación de eventos discretos.

    OpenAIRE

    Pablo Aracena; Darío Aedo; Ricardo Landeros

    2010-01-01

    Se analizó un sistema de cosecha mecanizado, operando en una faena a tala rasa de pino radiata y conformado por un feller buncher, un skidder con garra, un procesador y un trineumático. Un Modelo de Simulación de Eventos Discretos (MSED) fue desarrollado con el propósito de balancear el sistema. El proceso mecanizado de madera fue el limitante del sistema de acuerdo con los resultados del estudio de tiempos, entonces este proceso fue apoyado agregando a 3 operadores de motosierra para alcanza...

  2. EXPORTACIÓN DE MADERA ASERRADA DE CONÍFERA CHILENA: UN ANÁLISIS DE SU COMPETITIVIDAD

    OpenAIRE

    Ponce D,Mauricio; Contreras G,Manuel; Vásquez S,Marcia

    2007-01-01

    Se analiza la competitividad en los principales mercados de las exportaciones chilenas de madera aserrada de pino radiata en el período 1994-2004 (Contreras, 2006). Se aplica la metodología "Competitive Análisis of Nation" (CAN), creada por la Comisión Económica para América Latina y el Caribe (CEPAL), que permite obtener una visión dinámica de las situaciones de competitividad del producto en los mercados estudiados. Los resultados se compararon con un estudio similar del periodo 1987 a 1997...

  3. Host range testing of Tamarixia radiata (Hymenoptera: Eulophidae) sourced from the Punjab of Pakistan for classical biological control of Diaphorina citri (Hemiptera: Liviidae: Euphyllurinae: Diaphorinini) in California.

    Science.gov (United States)

    Hoddle, Mark S; Pandey, Raju

    2014-02-01

    ABSTRACT Tests evaluating the host range of Tamarixia radiata (Waterson) (Hymenoptera: Eulophidae), a parasitoid of the pestiferous Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), sourced from the Punjab of Pakistan, were conducted in quarantine at the University of California, Riverside, CA. Seven nontarget psyllid species (five native and two self-introduced species) representing five families were exposed to T radiata under the following three different exposure scenarios: 1) sequential no-choice tests, 2) static no-choice tests, and 3) choice tests. Nontarget species were selected for testing based on the following criteria: 1) taxonomic relatedness to the target, D. citri; 2) native psyllids inhabiting native host plants related to citrus that could release volatiles attractive to T. radiata; 3) native psyllids with a high probability of occurrence in native vegetation surrounding commercial citrus groves that could be encountered by T. radiata emigrating from D. citri-infested citrus orchards; 4) a common native pest psyllid species; and 5) a beneficial psyllid attacking a noxious weed. The results of host range testing were unambiguous; T radiata exhibited a narrow host range and high host specificity, with just one species of nontarget psyllid, the abundant native pest Bactericera cockerelli Sulc, being parasitized at low levels (citri poses negligible environmental risk.

  4. Effect of Partial Pre-Extraction of Hemicelluloses on the Properties of Pinus radiata Chemimechanical Pulps

    Directory of Open Access Journals (Sweden)

    Pablo Reyes

    2015-09-01

    Full Text Available Extraction of hemicelluloses prior to pulping and conversion of the extracted hemicelluloses to other bioproducts could provide additional revenue to traditional pulp and paper industries. The effect of hemicelluloses pre-extraction with a hydrothermal (HT process on Pinus radiata chemimechanical pulp (CMP properties was investigated in this study. The HT extraction resulted in a release of 7% to 58% of the initial amount of hemicelluloses from the wood. The extraction yield increased with temperature and extraction time. This hemicellulosic fraction was in the form of low molar mass oligomers with molecular weights varying from 1.5 to 100 kDa. Compared with the control (unextracted CMP pulp, the HT pre-extraction significantly reduced the refining energy to obtain a given fibrillation degree (freeness. The pulp yield with the HT/CMP process was in the range of 56% to 75%. Fiber properties of the pulps from pre-extracted wood, such as fiber length, were reduced, while increases in fiber width, fines content, fiber coarseness, and kink index were observed in comparison with the control pulps. The strength properties of CMP pulps decreased with increasing amounts of hemicellulose removal during the stage prior to pulping.

  5. Connectivity of the habitat-forming kelp, Ecklonia radiata within and among estuaries and open coast.

    Science.gov (United States)

    Coleman, Melinda A

    2013-01-01

    With marine protected areas being established worldwide there is a pressing need to understand how the physical setting in which these areas are placed influences patterns of dispersal and connectivity of important marine organisms. This is particularly critical for dynamic and complex nearshore marine environments where patterns of genetic structure of organisms are often chaotic and uncoupled from broad scale physical processes. This study determines the influence of habitat heterogeneity (presence of estuaries) on patterns of genetic structure and connectivity of the common kelp, Ecklonia radiata. There was no genetic differentiation of kelp between estuaries and the open coast and the presence of estuaries did not increase genetic differentiation among open coast populations. Similarly, there were no differences in level of inbreeding or genetic diversity between estuarine and open coast populations. The presence of large estuaries along rocky coastlines does not appear to influence genetic structure of this kelp and factors other than physical heterogeneity of habitat are likely more important determinants of regional connectivity. Marine reserves are currently lacking in this bioregion and may be designated in the future. Knowledge of the factors that influence important habitat forming organisms such as kelp contribute to informed and effective marine protected area design and conservation initiatives to maintain resilience of important marine habitats.

  6. The AVRDC - The World Vegetable Center mungbean (Vigna radiata) core and mini core collections.

    Science.gov (United States)

    Schafleitner, Roland; Nair, Ramakrishnan Madhavan; Rathore, Abhishek; Wang, Yen-wei; Lin, Chen-yu; Chu, Shu-hui; Lin, Pin-yun; Chang, Jian-Cheng; Ebert, Andreas W

    2015-04-29

    Large ex situ germplasm collections generally harbor a wide range of crop diversity. AVRDC--The World Vegetable Center is holding in trust the world's second largest mungbean (Vigna radiata) germplasm collection with more than 6,700 accessions. Screening large collections for traits of interest is laborious and expensive. To enhance the access of breeders to the diversity of the crop, mungbean core and mini core collections have been established. The core collection of 1,481 entries has been built by random selection of 20% of the accessions after geographical stratification and subsequent cluster analysis of eight phenotypic descriptors in the whole collection. Summary statistics, especially the low differences of means, equal variance of the traits in both the whole and core collection and the visual inspection of quantile-quantile plots comparing the variation of phenotypic traits present in both collections indicated that the core collection well represented the pattern of diversity of the whole collection. The core collection was genotyped with 20 simple sequence repeat markers and a mini core set of 289 accessions was selected, which depicted the allele and genotype diversity of the core collection. The mungbean core and mini core collections plus their phenotypic and genotypic data are available for distribution to breeders. It is expected that these collections will enhance the access to biodiverse mungbean germplasm for breeding.

  7. Solute accumulation and elastic modulus changes in six radiata pine breeds exposed to drought.

    Science.gov (United States)

    De Diego, N; Sampedro, M C; Barrio, R J; Saiz-Fernández, I; Moncaleán, P; Lacuesta, M

    2013-01-01

    Drought is one of the main abiotic factors that determine forest species growth, survival and productivity. For this reason, knowledge of plant drought response and the identification of physiological traits involved in stress tolerance will be of interest to breeding programs. In this work, several Pinus radiata D. Don breeds from different geographical origins were evaluated along a water stress period (4 weeks) and subsequent rewatering (1 week), showing different responses among them. Leaf water potential (Ψ(leaf)) and osmotic potential decreases were accompanied by a variation in the total relative water content (RWC, %). The most tolerant breeds presented the lowest leaf water potential and RWC at turgor loss point, and showed the lowest elastic modulus (ε) values. A high ε value was a characteristic of a less-drought-tolerant plant and was related to membrane alterations (high electrolyte leakage percentages) that could favor cell water loss. Of the group of solutes that contributed to osmotic adjustment, soluble carbohydrates were the most abundant, although stressed plants also increased their content of free amino acids [mainly proline (Pro) and glutamic acid (Glu), and γ-aminobutyric acid (GABA)] and free polyamines. In addition, the most sensitive breeds had a higher GABA/Glu ratio. After rewatering, Pro and GABA were higher in rehydrated plants than in controls.

  8. Cellular modelling of secondary radial growth in conifer trees: application to Pinus radiata (D. Don).

    Science.gov (United States)

    Forest, Loïc; Demongeot, Jacques; Demongeota, Jacques

    2006-05-01

    The radial growth of conifer trees proceeds from the dynamics of a merismatic tissue called vascular cambium or cambium. Cambium is a thin layer of active proliferating cells. The purpose of this paper was to model the main characteristics of cambial activity and its consecutive radial growth. Cell growth is under the control of the auxin hormone indole-3-acetic. The model is composed of a discrete part, which accounts for cellular proliferation, and a continuous part involving the transport of auxin. Cambium is modeled in a two-dimensional cross-section by a cellular automaton that describes the set of all its constitutive cells. Proliferation is defined as growth and division of cambial cells under neighbouring constraints, which can eliminate some cells from the cambium. The cell-growth rate is determined from auxin concentration, calculated with the continuous model. We studied the integration of each elementary cambial cell activity into the global coherent movement of macroscopic morphogenesis. Cases of normal and abnormal growth of Pinus radiata (D. Don) are modelled. Abnormal growth includes deformed trees where gravity influences auxin transport, producing heterogeneous radial growth. Cross-sectional microscopic views are also provided to validate the model's hypothesis and results.

  9. Suppression of CCR impacts metabolite profile and cell wall composition in Pinus radiata tracheary elements.

    Science.gov (United States)

    Wagner, Armin; Tobimatsu, Yuki; Goeminne, Geert; Phillips, Lorelle; Flint, Heather; Steward, Diane; Torr, Kirk; Donaldson, Lloyd; Boerjan, Wout; Ralph, John

    2013-01-01

    Suppression of the lignin-related gene cinnamoyl-CoA reductase (CCR) in the Pinus radiata tracheary element (TE) system impacted both the metabolite profile and the cell wall matrix in CCR-RNAi lines. UPLC-MS/MS-based metabolite profiling identified elevated levels of p-coumaroyl hexose, caffeic acid hexoside and ferulic acid hexoside in CCR-RNAi lines, indicating a redirection of metabolite flow within phenylpropanoid metabolism. Dilignols derived from coniferyl alcohol such as G(8-5)G, G(8-O-4)G and isodihydrodehydrodiconiferyl alcohol (IDDDC) were substantially depleted, providing evidence for CCR's involvement in coniferyl alcohol biosynthesis. Severe CCR suppression almost halved lignin content in TEs based on a depletion of both H-type and G-type lignin, providing evidence for CCR's involvement in the biosynthesis of both lignin types. 2D-NMR studies revealed minor changes in the H:G-ratio and consequently a largely unchanged interunit linkage distribution in the lignin polymer. However, unusual cell wall components including ferulate and unsaturated fatty acids were identified in TEs by thioacidolysis, pyrolysis-GC/MS and/or 2D-NMR in CCR-RNAi lines, providing new insights into the consequences of CCR suppression in pine. Interestingly, CCR suppression substantially promoted pyrolytic breakdown of cell wall polysaccharides, a phenotype most likely caused by the incorporation of acidic compounds into the cell wall matrix in CCR-RNAi lines.

  10. Silvicultural manipulation and site effect on above and belowground biomass equations for young Pinus radiata

    International Nuclear Information System (INIS)

    Rubilar, Rafael A.; Allen, H. Lee; Alvarez, Jose S.; Albaugh, Timothy J.; Fox, Thomas R.; Stape, Jose L.

    2010-01-01

    There is little understanding of how silvicultural treatments, during the early stages of tree development, affect allometric relationships. We developed and compared stem, branch, foliage, coarse and fine root biomass, and leaf area estimation equations, for four-year-old genetically improved radiata pine trees grown on three contrasting soil-site conditions. At each site, selected trees were destructively sampled from a control (shovel planted, no weed control, fertilized with 2 g of boron), a shovel planted + weed control (2 first years) + complete fertilization (nitrogen + phosphorus + boron 2 first years + potassium 2nd year), and a soil tillage (subsoil at 60 cm) + weed control (first 2 years) + complete fertilization treatment. Tissues were separated into foliage, branch, stem, fine and coarse roots (>2 mm). Regression equations for each tree biomass tissue versus leaf area were fit for each site and compared among treatments and sites with the same genetic material. Our results indicated that individual tree biomasses for young plantations are affected by silvicultural treatment and site growing conditions. Higher variability in estimates was found for foliage and branches due to the ephemeral nature of these components. Stem biomass equations vary less, but differences in biomass equations were found among sites and treatments. Coarse root biomass estimates were variable but less than expected, considering the gradient among sites. Similar to stem biomass, a simple positive general linear relationship between root collar diameter, or diameter at breast height with coarse roots biomass was developed across sites and treatments.

  11. Cytotoxic and Antimalarial Amaryllidaceae Alkaloids from the Bulbs of Lycoris radiata

    Directory of Open Access Journals (Sweden)

    Bin Hao

    2013-02-01

    Full Text Available Phytochemical investigation of the 80% ethanol extract of the bulbs of Lycoris radiata resulted in the isolation of five new Amaryllidaceae alkaloids: (+-5,6-dehydrolycorine (1, (+-3α,6β-diacetyl-bulbispermine (2, (+-3α-hydroxy-6β-acetyl- bulbispermine (3, (+-8,9-methylenedioxylhomolycorine-N-oxide (5, and 5,6-dihydro-5- methyl-2-hydroxyphenanthridine (7, together with two known compounds, (+-3α-methoxy- 6β-acetylbulbispermine (4 and (+-homolycorine- N-oxide (6. Structural elucidation of all the compounds were performed by spectral methods such as 1D and 2D (1H-1H COSY, HMQC, and HMBC NMR spectroscopy, in addition to high resolution mass spectrometry. Alkaloid 1 showed potent cytotoxicity against astrocytoma and glioma cell lines (CCF-STTG1, CHG-5, SHG-44, and U251, as well as HL-60, SMMC-7721, and W480 cell lines with IC50 values of 9.4–11.6 μM. Additonally, compound 1 exhibited antimalarial activity with IC50 values of 2.3 μM for D-6 strain and 1.9 μM for W-2 strain of Plasmodium falciparum.

  12. Golgi enrichment and proteomic analysis of developing Pinus radiata xylem by free-flow electrophoresis.

    Directory of Open Access Journals (Sweden)

    Harriet T Parsons

    Full Text Available Our understanding of the contribution of Golgi proteins to cell wall and wood formation in any woody plant species is limited. Currently, little Golgi proteomics data exists for wood-forming tissues. In this study, we attempted to address this issue by generating and analyzing Golgi-enriched membrane preparations from developing xylem of compression wood from the conifer Pinus radiata. Developing xylem samples from 3-year-old pine trees were harvested for this purpose at a time of active growth and subjected to a combination of density centrifugation followed by free flow electrophoresis, a surface charge separation technique used in the enrichment of Golgi membranes. This combination of techniques was successful in achieving an approximately 200-fold increase in the activity of the Golgi marker galactan synthase and represents a significant improvement for proteomic analyses of the Golgi from conifers. A total of thirty known Golgi proteins were identified by mass spectrometry including glycosyltransferases from gene families involved in glucomannan and glucuronoxylan biosynthesis. The free flow electrophoresis fractions of enriched Golgi were highly abundant in structural proteins (actin and tubulin indicating a role for the cytoskeleton during compression wood formation. The mass spectrometry proteomics data associated with this study have been deposited to the ProteomeXchange with identifier PXD000557.

  13. Pretreatment of radiata pine using two white rot fungal strains Stereum hirsutum and Trametes versicolor

    International Nuclear Information System (INIS)

    Shirkavand, Ehsan; Baroutian, Saeid; Gapes, Daniel J.; Young, Brent R.

    2017-01-01

    Highlights: • Fungal pretreatment by two New Zealand native white rot fungi was proposed. • Trametes versicolor was more efficient in selective degradation of pine wood chips. • Both fungal strains significantly decreased crystallinity index of biomass only after week 7 of degradation. • Structural analysis showed that Trametes versicolor and Stereum hirsutum increased porous surface area of woody biomass. - Abstract: Stereum hirsutum and Trametes versicolor, were studied over a period of 3–7 weeks for pretreatment of radiata pine wood chips. Chemical analysis of pretreated biomass showed that the two studied strains were able to selectively degrade lignin. Selective lignin degradation was greater in week 3 of the pretreatment by Trametes versicolor compared to the other strain. Lengthening pretreatment time increased both lignin and cellulose losses which caused a reduction in selective lignin degradation for both strains. X-ray diffractometry showed that after seven weeks of pretreatment, the crystallinity of the woody biomass was decreased significantly. It decreased from 46% for untreated wood chips to 37% and 44% for Stereum hirsutum and Trametes versicolor treated biomass, respectively. The pretreatment with these two white rot fungi showed that 3-week pretreatment provided a cellulose rich biomass with the minimum cellulose loss compared to the other time of pretreatment.

  14. Injury of leg somatotopy of corticospinal tract at corona radiata by ventriculoperitoneal shunt: A case report.

    Science.gov (United States)

    Jang, Sung Ho; Kwon, Younghyeon

    2018-03-01

    A 45-year-old right-handed female patient suffered head trauma after being hit by a truck that ran into a house. The patient lost consciousness for 1 hour and experienced posttraumatic amnesia for 1 month after the accident. She underwent conservative management for a subdural hematoma in the left frontotemporal lobes and intracerebral hematoma in the left frontal lobe. The patient's Glasgow Coma Scale score was 11. She underwent a VP shunt operation, approached through the right posterior parietal area of the brain, at 4 months after onset. Approximately, 6 months after onset, she was admitted to the rehabilitation department of a university hospital. She presented with moderate weakness of the left leg: Medical Research Council scores: hip flexor; 3, knee extensor; 3+, ankle dorsiflexor; 3-. Brain magnetic resonance imaging revealed a leukomalactic lesion in the right posterior corona radiata along the shunt. On 6-month (2 months after the shunt operation) diffusion tensor tractography, the left CST showed partial injury in the posterior portion compared with the right CST. On 6-month transcranial magnetic stimulation study, the motor-evoked potential obtained at the left tibialis anterior muscle revealed lower amplitude than that on the right side. Injury of leg somatotopy of a CST was demonstrated in a patient with leg weakness following a VP shunt operation.

  15. Reduction in flatulence factors in mung beans (Vigna radiata) using low-dose gamma-irradiation

    International Nuclear Information System (INIS)

    Machaiah, J.P.; Pednekar, M.D.; Thomas, P.

    1999-01-01

    Mungbeans (Vigna radiata), control and gamma-irradiated at insect disinfestation dose levels (0.25 and 0.75 kGy) were germinated (0-6 Bays) and the qualitative and quantitative changes in soluble carbohydrates were studied in detail. The key flatulence-producing raffinose family oligosaccharides inmungbeans were degraded in the irradiated samples at the onset of the germination (0-2 days) compared to the control where it occurred much later (>4days). However, the reducing sugars, mainly glucose, fructose and galactose, which are metabolised easily, were enhanced in the irradiated samples. At low dose (0.25 kGy), irradiation had no effect on germination and sprout length, indicating that irradiated beans are suitable for use as sprouted beans. These observations clearly indicate that gamma-irradiation at insect disinfestation dose levels improved the digestibility and nutritional quality of mung beans by reducing the content of oligosaccharides responsible for intestinal gas production. (C) 1999 Society of Chemical Industry

  16. Increased antioxidant activity and polyphenol metabolites in methyl jasmonate treated mung bean (Vigna radiata sprouts

    Directory of Open Access Journals (Sweden)

    Li LI

    Full Text Available Abstract Mung bean sprouts are a popular health food both in China and worldwide. We determined the optimal concentration of exogenous methyl jasmonate (MeJA for the promotion of the sprouting in mung beans (Vigna radiata. The 1,1-diphenyl-2- picrylhydrazyl radical (DPPH scavenging test showed that MeJA application resulted in significantly improved antioxidant capacity in the sprouts 72 h later. Measurement of total polyphenols in MeJA-treated beans from 0 to 168 h, using Folin–Ciocalteu colorimetry, showed that the polyphenols changing was significantly correlated with antioxidant activity. The main polyphenols isovitexin, kaempferol-3-O-rutinoside, daidzein, genistein, isoquercitrin, p-coumaric acid, and caffeic acid were quantified using high-performance liquid chromatography (HPLC/QqQ MS and partial least squares discriminant analysis (PLS-DA. MeJA promoted the production of polyphenols, metabolites, and antioxidants in the sprouts; therefore, its use may allow sprouts to be prepared more quickly or increase their nutritional value.

  17. Efeitos da dieta proteica na cicatrização de fraturas distais de fêmur imobilizadas com pinos intramedulares em cão

    Directory of Open Access Journals (Sweden)

    Silveira Iandara Silva

    1997-01-01

    Full Text Available No presente experimento vinte cães sem raça definida, pesando em média 6kg, com idade variando entre 4 e 12 anos, vindos do Biotério Central da Universidade Federal de Santa Maria (UFSM, foram distribuidos em dois grupos com 10 animais, cada grupo dividido em dois subgrupos com 5 cães, denominados 1A, 1B, 2A e 2B. Os animais do grupo 1 receberam tratamento por 90 dias, e os do grupo 2 por 60 dias após a cirurgia. O subgrupo A correspondem a tratamento com ração crescimento contendo 27% de proteina bruta e o subgrupo B ração manutenção com 21% de proteina bruta. Todos os cães sofreram fratura distal de fêmur, experimental, reduzidas com dois pinos intramedulares, introduzidos através da superfície articular da tróclea. Os cães ficaram confinados em canis individuais até a remoção dos pontos e em canis comuns para no máximo 5 cães até o término do experimento. Foi feita avaliação clínica, radiográfica e histológica da evolução da cicatrização óssea a qual demonstrou que o tratamento com ração com maior teor de proteina proporcionou melhor regeneração e que a técnica de osteossíntese utilizada manteve estabilidade na linha de fratura.

  18. Novel ssDNA Viruses Detected in the Virome of Bleached, Habitat-Forming Kelp Ecklonia radiata

    Directory of Open Access Journals (Sweden)

    Douglas T. Beattie

    2018-01-01

    Full Text Available Kelp forests provide essential habitats for organisms in temperate rocky shores. Loss of kelp forests has occurred over large areas in a number of temperate regions, including in Australia, where the dominant kelp Ecklonia radiata has been lost from substantial areas of the shoreline. Loss of E. radiata has been associated with environmental stressors, including increased temperature and anthropogenic contaminants, as well as biological factors, such as herbivory. Disease may also play a role, but there is little information on the role of disease in the loss of kelp from coastal ecosystems or on the potential role of pathogenic microorganisms, such as viruses. E. radiata across much of its distribution in Australia can develop a “bleached” phenotype, which may be a disease. To investigate whether the phenotype was associated with a potential viral agent, we shotgun sequenced viral particles that were isolated from kelp with normal (healthy and bleached phenotypes. Each virome consisted of ~380,000 reads, of which ~25% were similar to known viruses. All samples were dominated by bacteriophages, but novel ssDNA virus sequences were detected that were almost exclusively in viromes from the bleached kelp phenotype. These ssDNA viruses are covered by 11 contigs that contained complete capsids and characteristic rep genes that were 30–60% similar to those of circular, Rep-encoding ssDNA viruses (CRESS-DNA viruses. CRESS-DNA viruses have not previously been described from macroalgae, and the rep genes were similar to CRESS-DNA viruses from marine water samples, snails, crabs, anemones, but also dragonflies. This raises the interesting possibility that the kelp could be a vector of the CRESS-DNA viruses to other organisms that are associated with the bleached state.

  19. The effect of water availability on plastic responses and biomass allocation in early growth traits of Pinus radiata D. Don

    Energy Technology Data Exchange (ETDEWEB)

    Espinoza, S. E.; Magni, C. R.; Martinez, V. A.; Ivkovic, M.

    2013-05-01

    Aim of study: The aim of the study was to assess the effect of water availability on plastic responses and biomass allocation in early growth traits of Pinus radiata D. Don. Area of study: Seedlings of 69 families of P. radiata belonging to five different sites in Central Chile, ranging from coastal range to fothills of the Andes, were grown in controlled conditions to evaluate differences in response to watering. Material and methods: The seedlings were subjected to two watering regimes: well-watered treatment, in which seedlings were watered daily, and water stress treatment in which seedlings were subjected to three cyclic water deficits by watering to container capacity on 12 days cycles each. After twenty-eight weeks root collar diameter, height, shoot dry weight (stem + needles), root dry weight, total dry weight, height/diameter ratio and root/shoot ratio were recorded. Patterns and amounts of phenotypic changes, including changes in biomass allocation, were analyzed. Main results: Families from coastal sites presented high divergence for phenotypic changes, allocating more biomass to shoots, and those families from interior sites presented low phenotypic plasticity, allocating more biomass to roots at the expense of shoots. These changes are interpreted as a plastic response and leads to the conclusion that the local land race of P. radiata in Chile originating from contrasting environments possess distinct morphological responses to water deficit which in turn leads to phenotypic plasticity. Research highlights: Families belonging to sandy soil sites must be considered for tree breeding in dry areas, selecting those with high root: shoot ratio. (Author) 46 refs.

  20. Study of the effects of gamma sterilization on a bio material potential bone substitute: the nacre of Pinctada radiata (Leach, 1814)

    International Nuclear Information System (INIS)

    Ben Ammar, Rim

    2010-01-01

    In this work, we studied the effects of gamma irradiation at a dose of 25 kGy on physico-chemical properties of the nacre of the pearl oyster P. radiata Tunisian coast. The aim of our work is, after sterilizing the shell to gamma radiation, the study of its crystal structure, behavior and thermodynamics of the qualitative and quantitative composition of organic and inorganic matrices and compare them with those of the non-irradiated pearl . In addition, there has been interest in developing the method of sterilization with gamma irradiation to 25 kGy of the nacre of the pearl oyster Pinctada radiata.

  1. Experimental determination of the effect of temperature and humidity on the development of colour in Pinus radiata

    Directory of Open Access Journals (Sweden)

    M. McCurdy

    2005-06-01

    Full Text Available Experiments were undertaken to determine the effects of drying conditions (temperature and humidity on the development of kiln brown stain in radiata pine during drying. Eight schedules were tested with temperatures ranging from 50°C to 120°C and relative humidity from 14% to 67%. The variables measured were moisture content, color expressed using the CIELab color space, and nitrogen content. The experiments have shown that the kiln brown stain is influenced by drying temperature and drying time. The recommendation is therefore that low-temperature and low-humidity schedules be developed for controlling color development.

  2. Coronal MRI in the diagnosis of corona radiata infarcts adjacent to the lateral ventricles

    Energy Technology Data Exchange (ETDEWEB)

    Iwamoto, Toshihiko; Abe, Shin-e; Kanaya, Kiyoshi; Kubo, Hideki; Takasaki, Masaru (Tokyo Medical Coll. (Japan))

    1992-04-01

    To clarify pathophysiology of vascular lesions in corona radiata infarcts adjacent to the body of the lateral ventricle (CRILV), 17 patients with CRILV were studied by using magnetic resonance (MR) imaging. Based on the coronal MR images obtained between the anterior and posterior commissures, the patients were divided into two groups: (I) the group having infarcts below a line extending from the upper edge of the insular cistern to the external angle of the lateral ventricle adjacent to the corpus callosum (n=11); and (II) the group having lesions above the line towards the centrum semiovale (n=6). Most of the patients in both groups were male and had hypertension. Symptoms were gradually deteriorated and stroke in the morning was frequent in both groups, althrough the time from onset to completion was longer in Group II than Group I. In comparing clinical manifestations in Groups I and II, pure motor hemiparesis was found in 5 and 3 patients, and sensorimotor stroke in 2 and one patients, respectively. Drowsiness was found in 2 for Group I, while aphasia occurred in 2 for Group II. In addition, pseudobular and asymptomatic palsy occurred in each one patient for Group I. Prognosis was favorable in both groups, except for 2 who died of aspiration pneumonia. In Group I, 11 infarcts were well-defined, less than 15 mm in diameter on CT scans and were sclerotic in the main arteries without obstruction on angiograms. In contrast, Group II had ill-defined, larger low-density areas on CT scans and trunk obstruction of the internal carotid or middle cerebral arteries on angiograms. SPECT scans showed diffuse defect in Group II, in contrast to normal to diffuse or multiple defects in Group I. In Group I, lacunar lesions seemed to be caused by ischemia of the perforators, and in Group II, terminal zone infarcts in the territory of the cortical branches or watershed infarcts seemd to be caused by main trunk obstruction. (N.K.).

  3. Genetic variation for phytic acid content in mungbean (Vigna radiata L. Wilczek

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    Vinod Janardan Dhole

    2015-03-01

    Full Text Available Mungbean (Vigna radiata L. Wilczek is a short-duration legume crop cultivated for seeds that are rich in protein and carbohydrates. Mungbeans contain phytic acid (PA, an anti-nutritional factor that is the main storage form of organic phosphorus in seeds. It is a strong inhibitor against the absorption of nutrients including iron, zinc, calcium and magnesium in monogastric animals. Genotypes with low phytic acid (lpa in seed may show increased assimilation of nutrients and be useful in breeding lpa cultivars. The present study was conducted to identify lpa sources, genetic variation, heritability, and association with seed coat color, inorganic phosphorus (IP, and seed size in 102 mungbean genotypes including released varieties, land races, mutants, and wild species grown in two seasons: summer 2011 and rabi 2012. PA and IP in dry seeds were estimated by modified colorimetric method and Chen's modified method, respectively. PA, IP, and 100-seed weight differed significantly in the two seasons. PA content in 102 genotypes ranged from 5.74 to 18.98 mg g− 1 and 5.85 to 20.02 mg g− 1 in summer 2011 and rabi 2012, respectively. High heritability was found for PA (0.87 and 0.86 and seed size (0.82 and 0.83 but low heritability for IP (0.61 and 0.60. A negative correlation was found between PA and seed size (r = − 0.183 and − 0.267. Yellow and green seed coat genotypes contained significantly less PA than black seed coat genotypes. Cluster analysis revealed the distinctness of wild species, land races and cultivated varieties on the basis of PA content. The genotypes YBSM (6.001 mg g− 1 and JL-781 (6.179 mg g− 1 showed lowest PA. These lpa sources can be used to develop high-yielding mungbean cultivars with low phytic acid.

  4. Mobile phone radiation inhibits Vigna radiata (mung bean) root growth by inducing oxidative stress

    Energy Technology Data Exchange (ETDEWEB)

    Sharma, Ved Parkash [Department of Environment and Vocational Studies, Panjab University, Chandigarh 160014 (India); Department of Zoology, Panjab University, Chandigarh 160014 (India); Singh, Harminder Pal, E-mail: hpsingh_01@yahoo.com [Department of Environment and Vocational Studies, Panjab University, Chandigarh 160014 (India); Kohli, Ravinder Kumar; Batish, Daizy Rani [Department of Botany, Panjab University, Chandigarh 160014 (India)

    2009-10-15

    During the last couple of decades, there has been a tremendous increase in the use of cell phones. It has significantly added to the rapidly increasing EMF smog, an unprecedented type of pollution consisting of radiation in the environment, thereby prompting the scientists to study the effects on humans. However, not many studies have been conducted to explore the effects of cell phone EMFr on growth and biochemical changes in plants. We investigated whether EMFr from cell phones inhibit growth of Vigna radiata (mung bean) through induction of conventional stress responses. Effects of cell phone EMFr (power density: 8.55 {mu}W cm{sup -2}; 900 MHz band width; for 1/2, 1, 2, and 4 h) were determined by measuring the generation of reactive oxygen species (ROS) in terms of malondialdehyde and hydrogen peroxide (H{sub 2}O{sub 2}) content, root oxidizability and changes in levels of antioxidant enzymes. Our results showed that cell phone EMFr significantly inhibited the germination (at {>=}2 h), and radicle and plumule growths ({>=}1 h) in mung bean in a time-dependent manner. Further, cell phone EMFr enhanced MDA content (indicating lipid peroxidation), and increased H{sub 2}O{sub 2} accumulation and root oxidizability in mung bean roots, thereby inducing oxidative stress and cellular damage. In response to EMFr, there was a significant upregulation in the activities of scavenging enzymes, such as superoxide dismutases, ascorbate peroxidases, guaiacol peroxidases, catalases and glutathione reductases, in mung bean roots. The study concluded that cell phone EMFr inhibit root growth of mung bean by inducing ROS-generated oxidative stress despite increased activities of antioxidant enzymes.

  5. Mobile phone radiation inhibits Vigna radiata (mung bean) root growth by inducing oxidative stress

    International Nuclear Information System (INIS)

    Sharma, Ved Parkash; Singh, Harminder Pal; Kohli, Ravinder Kumar; Batish, Daizy Rani

    2009-01-01

    During the last couple of decades, there has been a tremendous increase in the use of cell phones. It has significantly added to the rapidly increasing EMF smog, an unprecedented type of pollution consisting of radiation in the environment, thereby prompting the scientists to study the effects on humans. However, not many studies have been conducted to explore the effects of cell phone EMFr on growth and biochemical changes in plants. We investigated whether EMFr from cell phones inhibit growth of Vigna radiata (mung bean) through induction of conventional stress responses. Effects of cell phone EMFr (power density: 8.55 μW cm -2 ; 900 MHz band width; for 1/2, 1, 2, and 4 h) were determined by measuring the generation of reactive oxygen species (ROS) in terms of malondialdehyde and hydrogen peroxide (H 2 O 2 ) content, root oxidizability and changes in levels of antioxidant enzymes. Our results showed that cell phone EMFr significantly inhibited the germination (at ≥2 h), and radicle and plumule growths (≥1 h) in mung bean in a time-dependent manner. Further, cell phone EMFr enhanced MDA content (indicating lipid peroxidation), and increased H 2 O 2 accumulation and root oxidizability in mung bean roots, thereby inducing oxidative stress and cellular damage. In response to EMFr, there was a significant upregulation in the activities of scavenging enzymes, such as superoxide dismutases, ascorbate peroxidases, guaiacol peroxidases, catalases and glutathione reductases, in mung bean roots. The study concluded that cell phone EMFr inhibit root growth of mung bean by inducing ROS-generated oxidative stress despite increased activities of antioxidant enzymes.

  6. Phosphorus Response and Amino Acid Composition of Different Green Gram (Vigna radiata L. Genotypes from Myanmar

    Directory of Open Access Journals (Sweden)

    M. Kywe

    2007-10-01

    Full Text Available Mungbean or green gram (Vigna radiata L. is an important component of rice-based cropping systems in Myanmar, where grain yields of around 800 kg ha^(-1 are much below its yield potential of 3000 kg ha^(-1. The reasons for this shortfall are as under-investigated as is the genotype-specific response of this crop to phosphorus (P application, which is critically low in many Myanmar soils, and the genetic variation in grain quality. For green gram quality, the concentration of lysine, an essential amino acid is particularly important given its scarcity in many cereal-based diets of Southeast Asia. The purpose of this study therefore was to investigate the effects of P application on the root and shoot growth, yield and its components for a range of green gram varieties, and to analyse the protein concentration and amino acid composition in green gram seed of different origins. To this end from 2001 to 2003, field experiments were conducted under rain-fed conditions in Yezin and Nyaung Oo. Fifteen landraces and five introduced green gram cultivars were grown at two levels of P (0 and 15 kg ha^(-1. There were large genotypic differences in P effects and a significant interaction between green gram genotypes and P for shoot and root growth. An unexpected benefit of P application was a reduction of pest and plant virus infestation in the field. Significant genotypic differences in the amino acid profile of seeds were also observed. The results indicate the potential for breeding efforts to increase seed yield and protein quality in green gram.

  7. Influence of distillery effluent on germination and growth of mung bean (Vigna radiata) seeds

    Energy Technology Data Exchange (ETDEWEB)

    Kannan, A. [Biomembrane Toxicology Division, Industrial Toxicology Research Centre, Post Box No. 80, M.G. Marg, Lucknow 226001 (India); Upreti, Raj K. [Biomembrane Toxicology Division, Industrial Toxicology Research Centre, Post Box No. 80, M.G. Marg, Lucknow 226001 (India)], E-mail: upretirk@rediffmail.com

    2008-05-01

    Distillery effluent or spent wash discharged as waste water contains various toxic chemicals that can contaminate water and soil and may affect the common crops if used for agricultural irrigation. Toxic nature of distillery effluent is due to the presence of high amounts of organic and inorganic chemical loads and its high-acidic pH. Experimental effects of untreated (Raw) distillery effluent, discharged from a distillery unit (based on fermentation of alcohol from sugarcane molasses), and the post-treatment effluent from the outlet of conventional anaerobic treatment plant (Treated effluent) of the distillery unit were studied in mung bean (Vigna radiata, L.R. Wilczek). Mung bean is a commonly used legume crop in India and its neighboring countries. Mung bean seeds were presoaked for 6 h and 30 h, respectively, in different concentrations (5-20%, v/v) of each effluent and germination, growth characters, and seedling membrane enzymes and constituents were investigated. Results revealed that the leaching of carbohydrates and proteins (solute efflux) were much higher in case of untreated effluent and were also dependent to the presoaking time. Other germination characters including percentage of germination, speed of germination index, vigor index and length of root and embryonic axis revealed significant concentration-dependent decline in untreated effluent. Evaluation of seedlings membrane transport enzymes and structural constituents (hexose, sialic acid and phospholipids) following 6 h presoaking of seeds revealed concentration-dependent decline, which were much less in treated effluent as compared to the untreated effluent. Treated effluent up to 10% (v/v) concentration reflected low-observed adverse effect levels.

  8. Efficacy of insecticides against army worm (spodoptera mauritia) on mung bean (vigna radiata l.) under arid climate

    International Nuclear Information System (INIS)

    Abbas, G.; Aslam, M.; Khokhar, M.B.; Khattak, J.Z.K.; Malik, A.U.

    2011-01-01

    Influence of Bifenthrine (Talstar) at the rate 375 ml ha/sup -1/, Deltaphos 10+350 EC at the rate 500 ml ha/sup -1/, Lorsban 40 EC at the rate 850 ml ha/sup -1/, Triazofos (20/400 EC) at the rate 750 ml ha/sup -1/and Karate 5 EC at the rate 1250 ml ha/sup -1/ was studied on mung bean (Vigna radiata L.) yield under arid climate at Adaptive Research Farm, Karor during two kharif seasons of 2007 and 2008. Experiments were laid out in randomized complete block design with six a test variety. All the chemicals showed significant impact on mung crop as compared to that in control treatments. AZRI- 2006, a promising variety of mung bean (Vigna radiata L.) for arid climate was used as plots, but the treatment of Deltaphos 10+350 EC at the rate 350 ml ha/sup -1/consistently proved better than other treatments. (author)

  9. Diffusion tensor magnetic resonance imaging for hand and foot fibers location at the corona radiata: comparison with two lesion studies

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    Dong-Hoon eLee

    2014-09-01

    Full Text Available The corticospinal tract is the motor pathway in the human brain, and corona radiata is an important location to diagnose stroke. We detected hand and foot motor fiber tracts in the corona radiata to investigate accurate locations using diffusion tensor imaging and functional imaging. Ten right-handed normal volunteers participated in this study. We used a probabilistic tracking algorithm, a brain normalization method, and functional imaging results to set out ROIs. Moreover, our results were compared to previous results of lesion studies to confirm their accuracy and usefulness. The location measurements were performed in two index types; anteriority index on the basis of the anterior and posterior location of lateral ventricle, laterality index on the basis of the left and right location. The anteriority indices were 56.40/43.2 (hand/foot at the upper CR and lower CR 40.72/30.90 at the lower CR. The measurements of anteriority and laterality of motor fibers were represented as anteriority index 0.40/0.31 and laterality index 0.60/0.47 (hand/foot. Our results showed that the hand and foot fibers were in good agreements with previous lesion studies. This study and approaches can be used as a standard for diffusion tensor image combined with lesion location studies in patients who need rehabilitation or follow up.

  10. In silico genome-wide identification and characterization of the glutathione S-transferase gene family in Vigna radiata.

    Science.gov (United States)

    Vaish, Swati; Awasthi, Praveen; Tiwari, Siddharth; Tiwari, Shailesh Kumar; Gupta, Divya; Basantani, Mahesh Kumar

    2018-05-01

    Plant glutathione S-transferases (GSTs) are integral to normal plant metabolism and biotic and abiotic stress tolerance. The GST gene family has been characterized in diverse plant species using molecular biology and bioinformatics approaches. In the current study, in silico analysis identified 44 GSTs in Vigna radiata. Of the total 44 GSTs identified, chromosomal locations of 31 GSTs were confirmed. The pI value of GST proteins ranged from 5.10 to 9.40. The predicted molecular weights ranged from 13.12 to 50 kDa. Subcellular localization analysis revealed that all GSTs were predominantly localized in the cytoplasm. The active site amino acids were confirmed to be serine in tau, phi, theta, zeta, and TCHQD; cysteine in lambda, DHAR, and omega; and tyrosine in EF1G. The gene architecture conformed to the two-exon/one-intron and three-exon/two-intron organization in the case of tau and phi classes, respectively. MEME analysis identified 10 significantly conserved motifs with the width of 8-50 amino acids. The motifs identified were either specific to a specific GST class or were shared by multiple GST classes. The results of the current study will be of potential importance in the characterization of the GST gene family in V. radiata, an economically important leguminous crop.

  11. Ionizing radiation induced changes in phenotype, photosynthetic pigments and free polyamine levels in Vigna radiata (L.) Wilczek

    International Nuclear Information System (INIS)

    Sengupta, Mandar; Chakraborty, Anindita; Raychaudhuri, Sarmistha Sen

    2013-01-01

    Effects of gamma rays on the free polyamine (PA) levels were studied in Vigna radiata (L.) Wilczek. Seeds exposed to different doses of gamma rays were checked for damage on phenotype, germination frequency and alteration in photosynthetic pigments. Free polyamine levels were estimated from seeds irradiated in dry and water imbibed conditions. Polyamine levels of seedlings grown from irradiated seeds, and irradiated seedlings from unexposed seeds were also measured. Damage caused by gamma irradiation resulted in decrease in final germination percentage and seedling height. Photosynthetic pigments decreased in a dose dependent manner as marker of stress. Polyamines decreased in irradiated dry seeds and in seedlings grown from irradiated seeds. Radiation stress induced increase in free polyamines was seen in irradiated imbibed seeds and irradiated seedlings. Response of polyamines towards gamma rays is dependent on the stage of the life cycle of the plant. - Highlights: ► Gamma irradiation of Vigna radiata (L.) Wilczek seeds and seedlings. ► Decrease in germination frequency. ► Increase in seedling injury with increased dosage of gamma rays. ► Decrease in chlorophyll and carotenoid pigments. ► Change in free polyamine levels

  12. Nontarget effects of chemical pesticides and biological pesticide on rhizospheric microbial community structure and function in Vigna radiata.

    Science.gov (United States)

    Singh, Sunil; Gupta, Rashi; Kumari, Madhu; Sharma, Shilpi

    2015-08-01

    Intensive agriculture has resulted in an indiscriminate use of pesticides, which demands in-depth analysis of their impact on indigenous rhizospheric microbial community structure and function. Hence, the objective of the present work was to study the impact of two chemical pesticides (chlorpyrifos and cypermethrin) and one biological pesticide (azadirachtin) at two dosages on the microbial community structure using cultivation-dependent approach and on rhizospheric bacterial communities involved in nitrogen cycle in Vigna radiata rhizosphere through cultivation-independent technique of real-time PCR. Cultivation-dependent study highlighted the adverse effects of both chemical pesticide and biopesticide on rhizospheric bacterial and fungal communities at different plant growth stages. Also, an adverse effect on number of genes and transcripts of nifH (nitrogen fixation); amoA (nitrification); and narG, nirK, and nirS (denitrification) was observed. The results from the present study highlighted two points, firstly that nontarget effects of pesticides are significantly detrimental to soil microflora, and despite being of biological origin, azadirachtin exerted negative impact on rhizospheric microbial community of V. radiata behaving similar to chemical pesticides. Hence, such nontarget effects of chemical pesticide and biopesticide in plants' rhizosphere, which bring out the larger picture in terms of their ecotoxicological effect, demand a proper risk assessment before application of pesticides as agricultural amendments.

  13. Ocean acidification reverses the positive effects of seawater pH fluctuations on growth and photosynthesis of the habitat-forming kelp, Ecklonia radiata.

    Science.gov (United States)

    Britton, Damon; Cornwall, Christopher E; Revill, Andrew T; Hurd, Catriona L; Johnson, Craig R

    2016-05-27

    Ocean acidification (OA) is the reduction in seawater pH due to the absorption of human-released CO2 by the world's oceans. The average surface oceanic pH is predicted to decline by 0.4 units by 2100. However, kelp metabolically modifies seawater pH via photosynthesis and respiration in some temperate coastal systems, resulting in daily pH fluctuations of up to ±0.45 units. It is unknown how these fluctuations in pH influence the growth and physiology of the kelp, or how this might change with OA. In laboratory experiments that mimicked the most extreme pH fluctuations measured within beds of the canopy-forming kelp Ecklonia radiata in Tasmania, the growth and photosynthetic rates of juvenile E. radiata were greater under fluctuating pH (8.4 in the day, 7.8 at night) than in static pH treatments (8.4, 8.1, 7.8). However, pH fluctuations had no effect on growth rates and a negative effect on photosynthesis when the mean pH of each treatment was reduced by 0.3 units. Currently, pH fluctuations have a positive effect on E. radiata but this effect could be reversed in the future under OA, which is likely to impact the future ecological dynamics and productivity of habitats dominated by E. radiata.

  14. Lack of genetic variation in tree ring delta13C suggests a uniform, stomatally-driven response to drought stress across Pinus radiata genotypes.

    Science.gov (United States)

    Rowell, Douglas M; Ades, Peter K; Tausz, Michael; Arndt, Stefan K; Adams, Mark A

    2009-02-01

    We assessed the variation in delta(13)C signatures of Pinus radiata D. Don stemwood taken from three genetic trials in southern Australia. We sought to determine the potential of using delta(13)C signatures as selection criteria for drought tolerance. Increment cores were taken from P. radiata and were used to determine the basal area increment and the delta(13)C signature of extracted cellulose. Both growth increment and cellulose delta(13)C were affected by water availability. Growth increment and delta(13)C were negatively correlated suggesting that growth was water-limited. While there was significant genetic variation in growth, there was no significant genetic variation in cellulose delta(13)C of tree rings. This suggests that different genotypes of P. radiata display significant differences in growth and yet respond similarly to drought stress. The delta(13)C response to drought stress was more due to changes in stomatal conductance than to the variation in photosynthetic capacity, and this may explain the lack of genetic variation in delta(13)C. The lack of genetic variation in cellulose delta(13)C of tree rings precludes its use as a selection criterion for drought tolerance among P. radiata genotypes.

  15. Improving initiation, genotype capture, and family representation in somatic embryogenesis of Pinus radiata by a combination of zygotic embryo maturity, media, and explant preparation

    DEFF Research Database (Denmark)

    Hargreaves, Cathy; Find, Jens; Reeves, Cathie

    2009-01-01

    The principal aim of this investigation was to improve somatic embryogenesis initiation and to enhance representation of families and genotypes within those families of Pinus radiata D. Don. A total of 19 open-pollinated seed families, many with unrelated and weakly related parents, were tested...

  16. Analysis of disconnected diallel mating designs II: results from a third generation progeny test of the New Zealand radiata pine improvement programme.

    Science.gov (United States)

    J.N. King; M.J. Carson; G.R. Johnson

    1998-01-01

    Genetic parameters from a second generation (F2) disconnected diallel progeny test of the New Zealand radiata pine improvement programme are presented. Heritability estimates of growth and yield traits of 0.2 are similar to progeny test results of the previous generation (F1) generation tests. A trend of declining dominance...

  17. Acute Toxicity of Fresh and Aged Residues of Pesticides to the Parasitoid Tamarixia radiata and to the HLB-Bacteria Vector Diaphorina citri.

    Science.gov (United States)

    Beloti, V H; Alves, G R; Moral, R A; Demétrio, C G B; Yamamoto, P T

    2018-06-01

    One method for controlling the Asian citrus psyllid (ACP) Diaphorina citri Kuwayama, the vector of the putative causal agent of Huanglongbing, uses the parasitoid Tamarixia radiata (Waterston). However, the general intensive use of insecticides has reduced the numbers of this parasitoid. This study evaluated the effect of the residual action of 24 insecticides on T. radiata and also determined the differential toxicity of insecticides to D. citri and T. radiata, using three bioassays. In the first, when adults of the parasitoid were exposed to residues of the 24 insecticides, ten were considered short-life (class 1), six slightly persistent (class 2), five moderately persistent (class 3), and three insecticides were considered persistent (class 4), under the IOBC/WPRS classification system. The second bioassay evaluated the sublethal concentrations of the persistent insecticides (formetanate, dimethoate, spinosad). Increasing the concentrations of the insecticides increased the number that were classified as persistent. In the third bioassay, evaluation of the differential toxicity of eight insecticides to the ACP and the parasitoid showed that chlorpyrifos and bifenthrin were more harmful to T. radiata. Therefore, these two insecticides are not recommended for application at the time of parasitoid release. Cypermethrin, imidacloprid, and dimethoate caused higher mortality of D. citri and are most often recommended in IPM programs. The choice of an insecticide for the control of citrus pests must be made with care, aiming to preserve the natural enemies in the ecosystem, and thereby contribute to the success of biological control.

  18. CONTENIDO DE HUMEDAD Y SUSTANCIAS INORGÁNICAS EN SUBPRODUCTOS MADERABLES DE PINO PARA SU USO EN PÉLETS Y BRIQUETAS

    Directory of Open Access Journals (Sweden)

    Fermín Correa-Méndez

    2014-01-01

    Full Text Available La industria forestal de la cabecera municipal Nuevo San Juan Parangaricutiro y de la Comunidad Indígena de Nuevo San Juan Parangaricutiro, Michoacán, México, generan 1,232 m3·año-1 de aserrín y viruta de pino que son subutilizados. El aserrín y la viruta de Pinus leiophylla Sch. Et Cham., P. montezumae Lamb. y P. pseudostrobus Lindl se analizaron fisicoquímicamente para determinar si reunían los requisitos para la elaboración de pélets y briquetas. El contenido de humedad, ceniza y elementos inorgánicos de los subproductos se determinaron según estándares internacionales. El contenido de humedad en aserrín fue 51.5 ± 1.9 % y 53.7 ± 0.1 % en viruta; estos valores superaron el máximo permisible. El contenido de cenizas en el aserrín y en la viruta fue 0.26 ± 0.03 % y 0.34 ± 0.03 %, respectivamente. En las tres especies evaluadas, el porcentaje medio de Ca, K, Mg, P, S, Si, Fe, Al y Na en el aserrín fue 47.1 ± 2.8, 26.0 ± 2.5, 13.5 ± 0.4, 5.0 ± 0.4, 3.2 ± 0.4, 2.3 ± 0.8, 1.0 ± 0.1, 1.3 ± 0.4 y 1.4 ± 0.3, respectivamente, mientras que el porcentaje medio de Ca, K, Mg, P, S, Si, Fe, Al y Na en la viruta fue 43.2 ± 7.0, 16.5 ± 3.0, 10.1 ± 4.8, 4.0 ± 0.6, 1.8 ± 0.2, 3.6 ± 0.3, 1.0 ± 0.6, 1.1 ± 0.1, y 1.0 ± 0.6, respectivamente. El arsénico sólo se encontró en la viruta (17.1 ± 17.1 %. De acuerdo con los resultados, el aserrín es el subproducto más adecuado para la producción de pélets y briquetas.

  19. Seasonal changes in stable carbon isotope ratios within annual growth rings of Pinus radiata

    International Nuclear Information System (INIS)

    Walcroft, A.; Silvester, W.; Whitehead, D.; Kelliher, F.

    1997-01-01

    The stable isotope composition of photosynthetically assimilated carbon (δ 13 C) is determined by the ratio of the leaf internal CO 2 concentration (c i ) to that of the ambient air (c a ), and so reflects the contribution of both stomatal conductance (g s ) and the rate of photosynthesis (A). Assimilated carbon which is subsequently laid down as wood in annual growth rings may therefore represent a time integrated record of physiological responses by the whole tree to seasonal changes in the environmental variables regulating growth. We analysed the stable carbon isotope composition of Pinus radiata wood collected from two plantation forest sites in New Zealand which differ markedly in temperature, rainfall and soil characteristics. For both sites, discs were cut from the stem of several trees near ground level and whole wood samples were taken from within individual annual growth rings over a number of years. At one site, diameter bands were installed over the 1994 - 1996 growing seasons in order to date precisely the formation of wood during that time. Trees at each site consistently showed a seasonal pattern in the stable isotope composition of wood within individual growth rings. The amplitude of seasonal δ 13 C variation at the wet and dry sites were 1-2 per thousand and 4 per thousand respectively. Mean δ 13 C values from the wet site were 3 per thousand more 13 C depleted than those from the dry site implying lower water-use efficiency (carbon assimilation per unit transpiration). A process-based, model of stomatal conductance and CO 2 assimilation was combined with a soil-water balance model to estimate the average daily leaf-level intercellular CO 2 concentration (c i ). Over two growing seasons at each site there was generally good agreement between mean canopy-level c i derived from the tree-ring δ 13 C data and modelled leaf-level c i levels. Further, the ratio of annual CO 2 assimilation to transpiration estimated by the model for each site

  20. Contrasting Effects of Aqueous Tissue Extracts from an Invasive Plant, Bidens pilosa L. var. radiata, on the Performance of Its Sympatric Plant Species

    Directory of Open Access Journals (Sweden)

    Hsiao-Mei Hsu

    2009-09-01

    Full Text Available Bidens pilosa L. var. radiata Sch. Bip., a common weed in lowland Taiwan, is listed as one of the twenty most noxious invasive plants in Taiwan. In this study, we examined the effect of aqueous extracts of leaves, stems and roots of the invasive plant on germination and growth of seedlings (estimated by measuring the elongation of hypocotyls and radicals of the same species and two other sympatric species, B. bipinnata and Ageraturem conyzoides. The objective of this study was to understand whether the aqueous tissue extracts affected the performance of the target species and whether these effects varied among tissue types and among target species. We found that the germination percentage of seeds of B. bipinnata was significantly reduced by root and leaf extracts, that of B. pilosa var. radiata was also significantly reduced by the application of root extract, while that of A. conyzoides was not affected by any of the three tissue extracts. The application of stem and leaf extracts inhibited the elongation of radicals of B. pilosa var. radiata, consequently, the growth of seedlings of this species was decreased in these two treatments. Though the elongation of hypocotyls was stimulated by leaf extract, the overall growth of seedlings of B. bipinnata was not affected by any tissue extract. In contrast, all three extracts stimulated the elongation of hypocotyls and radicals of A. conyzoides, consequently, the overall growth of seedlings of this plant was promoted by all three extracts. These results revealed that aqueous extracts from tissue of B. pilosa var. radiata had differential effect on the emergence and seedling growth of the three target species. The inhibition effect of its root and leaf extracts on the germination of B. bipinnata may partially explain the overwhelming dominance of B. pilosa var. radiata over B. bipinnata when they are sympatric.

  1. Effect of the surface treatment of plain carbon fiber posts on the retention of the composite core: an in vitro evaluation Efeito do tratamento superficial de pinos de fibra de carbono lisos na retenção da resina de preenchimento: uma avaliação in vitro

    Directory of Open Access Journals (Sweden)

    Adriana Ferreira QUINTAS

    2001-03-01

    Full Text Available This study aims to evaluate the role of surface treatments performed on plain carbon fiber posts, in relation to serrated carbon fiber posts, in the retention of the composite core. Fifty carbon fiber posts received surface treatments in order to verify their influence on the retention of the core material. An acrylic resin mold was developed in order to precisely fit the post, leaving a machined space to accommodate a self-curing composite resin. After the surface treatment, a primer was applied on the coronal portion of all posts, which were then dried. They were fitted to the mold and received a 3 mm composite core. All specimens were thermocycled and then stored in distilled water for a week. Tension test was performed at a speed of 0.5 mm/min until there was lack of adhesion or fracture of the core. The conclusions were: a the values of retention related to aluminum oxide spray (group A, depth cutter diamond burs (group C and posts with machined coronal portion (group D were comparable to those of serrated posts (group E, although no statistically significant difference between these groups was found; b the mean values of core retention in group B (medium grit diamond burs were statistically lower than those of other groups.Foi avaliado o possível efeito de tratamentos superficiais em pinos de fibra de carbono lisos, quando comparados aos pinos serrilhados, na retenção à resina composta empregada na confecção de núcleos de preenchimento. Foram utilizados cinqüenta pinos de fibra de carbono, divididos em cinco grupos: os quatro primeiros grupos eram constituídos por pinos do tipo liso, cujas superfícies foram tratadas, e o último grupo por dez pinos do tipo serrilhado. Foram desenvolvidas matrizes de resina acrílica com um leito ajustado para conter o pino, com um alargamento na porção coronária para posterior preenchimento com resina composta. Após o tratamento superficial, todos os pinos receberam camadas de "primer", foram

  2. Evaluation of ischemic corticospinal tract damage by diffusion tensor MRI. Its significance to predict functional outcome of corona radiata infarct

    International Nuclear Information System (INIS)

    Tanaka, Hideki

    2010-01-01

    Motor impairment is one of the most frequent symptoms among stroke patients and often leads to poststroke dependency. Recent advances of diffusion tensor MR imaging made it possible to identify corticospinal tract (CST) three-dimensionally and evaluate structural damage, so precise evaluation of the ischemic CST damage became feasible.Motor impairment, lesion size and location upon diffusion weighted MR image and clinical outcome were assessed in 23 acute to subacute capsular and corona radiata infarct patients. According to the lesion size, patients were grouped into A, maximal diameter below 15 mm and B, that above 15 mm. Motor impairment was graded severe: limb movement synergy level, moderate: selective muscle activity possible and mild: isolated movements well co-ordinated, each corresponding to Brunnstrom stage 1-3, 4-5, and 6, respectively. Outcome at the time of discharge was assessed by modified Rankin Scale (mRS), discharge destination and length of hospital stay were also registered. Diffusion tensor MR imaging was conducted in 15 corona radiata infarct patients at 2.3+-2.2 days from the onset of the clinical symptoms. CST was 3-dimensionally identified with dTV. II. SR and Volume-one 1.72 and CST-FA ratio (ipsi-/contralesional CST-FA) and CST-Area% (CST lesion free area/whole CST area) were obtained at the level where ischemic damage was most prominent and correlation of these parameters to motor impairment and clinical outcome was studied. CST-FA ratio and CST-Area% were in good correlation to motor impairment at presentation. Patients with severe motor impairment had lower CST-FA ratio and CSF-Area% than those with moderate or mild. CST-FA ratio was 0.73+-0.22 in patients with poor clinical outcome (mRS 3-6) and 0.93+-0.09 with good clinical outcome (mRS 0-2) (p=0.038). Diffusion tensor MR imaging is useful in evaluating motor impairment and predicting functional outcome of corona radiata infarct patient in the acute to subacute stage. (author)

  3. Salt and drought stress and ABA responses related to bZIP genes from V. radiata and V. angularis.

    Science.gov (United States)

    Wang, Lanfen; Zhu, Jifeng; Li, Xiaoming; Wang, Shumin; Wu, Jing

    2018-04-20

    Mung bean and adzuki bean are warm-season legumes widely cultivated in China. However, bean production in major producing regions is limited by biotic and abiotic stress, such as drought and salt stress. Basic leucine zipper (bZIP) genes play key roles in responses to various biotic and abiotic stresses. However, only several bZIP genes involved in drought and salt stress in legumes, especially Vigna radiata and Vigna angularis, have been identified. In this study, we identified 54 and 50 bZIP proteins from whole-genome sequences of V. radiata and V. angularis, respectively. First, we comprehensively surveyed the characteristics of all bZIP genes, including their gene structure, chromosome distribution and motif composition. Phylogenetic trees showed that VrbZIP and VabZIP proteins were divided into ten clades comprising nine known and one unknown subgroup. The results of the nucleotide substitution rate of the orthologous gene pairs showed that bZIP proteins have undergone strong purifying selection: V. radiata and V. angularis diverged 1.25 million years ago (mya) to 9.20 mya (average of 4.95 mya). We also found that many cis-acting regulatory elements (CAREs) involved in abiotic stress and plant hormone responses were detected in the putative promoter regions of the bZIP genes. Finally, using the quantitative real-time PCR (qRT-PCR) method, we performed expression profiling of the bZIP genes in response to drought, salt and abscisic acid (ABA). We identified several bZIP genes that may be involved in drought and salt responses. Generally, our results provided useful and rich resources of VrbZIP and VabZIP genes for the functional characterization and understanding of bZIP transcription factors (TFs) in warm-season legumes. In addition, our results revealed important and interesting data - a subset of VrbZIP and VabZIP gene expression profiles in response to drought, salt and ABA stress. These results provide gene expression evidence for the selection of

  4. Biomass partitioning and leaf area of Pinus radiata trees subjected to silvopastoral and conventional forestry in the VI region, Chile Distribución de biomasa y área foliar en árboles de Pinus radiata sometidos a manejo silvopastoral y convencional en la VI región, Chile

    Directory of Open Access Journals (Sweden)

    ROLANDO RODRÍGUEZ

    2003-09-01

    Full Text Available The effects of silvicultural regimes on leaf area and biomass distribution were analyzed in 16-year old Pinus radiata trees growing in the semiarid zone of Chile. Three stands with different silvopastoral management were compared with a conventionally managed stand. Data were obtained through destructive sampling of 36 trees and analyzed by MANOVA and regression models of ANCOVA. Results show that the management regime affects the leaf area. Specific leaf area was affected by both silvicultural regime and crown position. Total biomass per tree under the silvopastoral regime was 2.1 to 2.5 times larger than in the conventional forestry regime. However, aboveground biomass partitioning was neither affected by the silvicultural regime nor by the schemes of silvopastoral management. The most important allometric change was in fine root biomass, which was greater under the conventional forestry regime than in the silvopastoral one. Fine root biomass increases with a regular distribution of the plants in the field, and decreases with the clumping of trees. Similarly, the fine root biomass decreases with fertilization. Both plantation design and fertilization regimes explain the changes in the fine root biomass to components of the crown. However, crown structure influences the magnitude of these changes.Se analizaron los efectos del régimen silvícola en el área foliar y distribución de biomasa en árboles de Pinus radiata de 16 años, creciendo en la zona semiárida de Chile. Para ello se compararon tres rodales con manejo silvopastoral con uno manejado en forma tradicional. Los datos se obtuvieron mediante muestreo destructivo de 36 árboles y se analizaron mediante MANOVA y regresión en modelos de ANCOVA. Los resultados permiten concluir que el régimen de manejo afectó el área foliar. El área foliar específica fue afectada por el régimen silvícola y su posición en la copa. La biomasa total por árbol con régimen silvopastoral es 2,1 a

  5. First record of the genus .i.Bloszykiella./i. in Kenya with the description of .i.Bloszykiella tertia./i. sp n. (Acari: Uropodidae) from a .i.Pinus radiata./i. D. Don plantation

    Czech Academy of Sciences Publication Activity Database

    Kontschán, J.; Starý, Josef

    2015-01-01

    Roč. 56, č. 3 (2015), s. 629-635 ISSN 1681-5556 Institutional support: RVO:60077344 Keywords : Acari * new species * Pinus radiata plantation * Kenya Subject RIV: EG - Zoology Impact factor: 0.708, year: 2015

  6. Effect of (/sup 60/cobalt) gamma rays on growth and root rot diseases in mungbean (vigna radiata L.)

    International Nuclear Information System (INIS)

    Ikram, N.; Dawar, S.; Zaki, M.J.; Abass, Z.

    2010-01-01

    Present investigation showed that gamma rays influences suppressive effect on root rot fungi such as Macrophomina phaseolina (Tassi) Goid, Rhizoctonia solani Kuhn and Fusarium spp., and inducive effect on growth parameters of mung bean (Vigna radiata L.). Seeds of mung bean were treated with gamma rays (/sup 60/Cobalt) at time periods of 0 and 4 minutes and stored for 90 days at room temperature to determine its effect on growth parameters and infection of root infecting fungi. All treatments of gamma rays enhanced the growth parameters as compared to untreated plants. Infection of M. phaseolina, R. solani and Fusarium spp., were significantly decreased on mung bean seeds treated with gamma rays. Gamma rays significantly increased the growth parameters and controlled the root rot fungi up to 90 days of storage of seeds. (author)

  7. Biofertilizing efficiency of Sargassum polycystum extract on growth and biochemical composition of Vigna radiata and Vigna mungo

    Directory of Open Access Journals (Sweden)

    B Bharath

    2018-01-01

    Full Text Available Objective: To evaluate the effect of marine brown alga Sargassum polycystum extract on growth and biochemical parameters of Vigna radiata and Vigna mungo.Methods: Different concentrations of algal extracts (0.5%, 1.0%, 2.0%, 3.0%, 4.0%, and 5.0% were prepared and applied to the crops at every 10-day intervals under natural conditions. After 30 d, the plants were harvested to evaluate the growth and biochemical parameters.Results: Seaweed liquid fertilizers treated seedlings showed maximum growth in 3.0% concentration when compared to the untreated seedlings. Similarly, biochemical parameters such as photosynthetic pigments, protein, reducing sugar, total sugar and amino acids exhibited increases in 3.0% concentration seaweed extract. Decreases in growth and biochemical parameters were noticed in concentrations higher than 3.0%.Conclusions: Presence of micronutrients and growth regulating substances in the liquid extract help healthier and faster productivity of the crop.

  8. Relationship between diffusion tensor fractional anisotropy and motor outcome in patients with hemiparesis after corona radiata infarct.

    Science.gov (United States)

    Koyama, Tetsuo; Marumoto, Kohei; Miyake, Hiroji; Domen, Kazuhisa

    2013-11-01

    This study examined the relationship between fractional anisotropy (FA) values of magnetic resonance-diffusion tensor imaging (DTI) and motor outcome (1 month after onset) in 15 patients with hemiparesis after ischemic stroke of corona radiata lesions. DTI data were obtained on days 14-18. FA values within the cerebral peduncle were analyzed using a computer-automated method. Motor outcome of hemiparesis was evaluated according to Brunnstrom stage (BRS; 6-point scale: severe to normal) for separate shoulder/elbow/forearm, wrist/hand, and lower extremity functions. The ratio of FA values in the affected hemisphere to those in the unaffected hemisphere (rFA) was assessed in relation to the BRS data (Spearman rank correlation test, P<.05). rFA values ranged from .715 to 1.002 (median=.924). BRS ranged from 1 to 6 (median=4) for shoulder/elbow/forearm, from 1 to 6 (median=5) for wrist/hand, and from 2 to 6 (median=4) for the lower extremities. Analysis revealed statistically significant relationships between rFA and upper extremity functions (correlation coefficient=.679 for shoulder/elbow/forearm and .706 for wrist/hand). Although slightly less evident, the relationship between rFA and lower extremity function was also statistically significant (correlation coefficient=.641). FA values within the cerebral peduncle are moderately associated with the outcome of both upper and lower extremity functions, suggesting that DTI may be applicable for outcome prediction in stroke patients with corona radiata infarct. Copyright © 2013 National Stroke Association. Published by Elsevier Inc. All rights reserved.

  9. Halopriming of seeds imparts tolerance to NaCl and PEG induced stress in Vigna radiata (L.) Wilczek varieties.

    Science.gov (United States)

    Jisha, K C; Puthur, Jos T

    2014-07-01

    The investigation was carried out to study the effect of halopriming on NaCl and polyethylene glycol-6000 (PEG-6000) induced stress tolerance potential of three Vigna radiata (L.) Wilczek varieties, with varied abiotic stress tolerance potential. Halopriming is a seed priming technique in which the seeds were soaked in various salt solutions (in this study NaCl was used). The results of the study indicated that the application of stresses (both NaCl and PEG) induced retardation of growth attributes (measured in terms of shoot length, fresh weight, dry weight) and decrease in physiological attributes like total chlorophyll content, metabolites, photosynthetic and mitochondrial activity of the seedlings in all three V. radiata (L.) varieties. However, halopriming of the seeds could reduce the extent of decrease in these biological attributes. NaCl and PEG stress also caused increase in MDA content (a product of membrane lipid peroxidation) in all the varieties studied and this increase was significantly minimized under halopriming. From the present investigation it was evident that among the green gram varieties studied, Pusa Vishal, a NaCl tolerant variety showed enhanced tolerance to NaCl and PEG induced stress, when the seeds were subjected to halopriming followed by Pusa Ratna (stress sensitive variety). Pusa 9531 (drought tolerant variety) also showed positive halopriming effects but it was less significant when compared to other two varieties. It could be concluded that halopriming improved the drought and salinity stress tolerance potential of all varieties and it was significantly higher in the Pusa Vishal as compared to Pusa 9531 and Pusa Ratna.

  10. Expanding the repertoire of microsatellite markers for polymorphism studies in Indian accessions of mung bean (Vigna radiata L. Wilczek).

    Science.gov (United States)

    Shrivastava, Divya; Verma, Priyanka; Bhatia, Sabhyata

    2014-09-01

    Limited availability of validated, polymorphic microsatellite markers in mung bean (Vigna radiata), an important food legume of India, has been a major hurdle towards its improvement and higher yield. The present study was undertaken in order to develop a new set of microsatellite markers and utilize them for the analysis of genetic diversity within mung bean accessions from India. A GA/CT enriched library was constructed from V. radiata which resulted in 1,250 putative recombinant clones of which 850 were sequenced. SSR motifs were identified and their flanking sequences were utilized to design 328 SSR primer pairs. Of these, 48 SSR markers were employed for assessing genetic diversity among 76 mung bean accessions from various geographical locations in India. Two hundred and thirty four alleles with an average of 4.85 alleles per locus were detected at 48 loci. The polymorphic information content (PIC) per locus varied from 0.1 to 0.88 (average: 0.49 per locus). The observed and expected heterozygosities ranged from 0.40 to 0.95 and 0.40 to 0.81 respectively. Based on Jaccard's similarity matrix, a dendrogram was constructed using the unweighted pair-group method with arithmetic averages (UPGMA) analysis which revealed that one accession from Bundi, Rajasthan was clustered out separately while remaining accessions were grouped into two major clusters. The markers generated in this study will help in expanding the repertoire of the available SSR markers thereby facilitating analysis of genetic diversity, molecular mapping and ultimately broadening the scope for genetic improvement of this legume.

  11. Interdependence of plant water status with photosynthetic performance and root defense responses in Vigna radiata (L.) Wilczek under progressive drought stress and recovery.

    Science.gov (United States)

    Sengupta, Debashree; Guha, Anirban; Reddy, Attipalli Ramachandra

    2013-10-05

    The present study investigates the interdependence of plant water status with foliar and root responses in Vigna radiata L.Wilczek under progressive drought. Vegetatively-mature V. radiata plants were subjected to water withdrawal for 3 and 6days (D3 and D6, respectively) and then re-watered subsequently for 6days (6R) for stress-recovery. Changes in plant water status were expressed in terms of leaf and root moisture contents (LMC and RMC, respectively) and leaf relative water content (LRWC). Progressive drought caused apparent decrease in LRWC, LMC and RMC depicting significant level of dehydration of leaf and root tissues. Stomatal limitation alone could not account for the observed decrease in net CO2 assimilation rates (Pn) due to comparatively less decrease in sub-stomatal CO2 (Ci) concentrations with respect to other gas exchange parameters indicating possible involvement of non-stomatal limitations. Analysis of polyphasic chl a fluorescence kinetics during progressive drought showed decreased energy connectivity among PSII units as defined by a positive L-band with highest amplitude during D6. Efficiency of electron flux from OEC towards PSII acceptor side was not significantly affected during drought conditions as evidenced by the absence of a positive K-band. Increasing root-level water-limitation enforced a gradual oxidative stress through H2O2 accumulation and membrane lipid peroxidation in V. radiata roots exhibiting drastic enhancement of proline content and a significant but gradual increase in ascorbic acid content as well as guaiacol peroxidase activity under progressive drought. Expression analysis of Δ(1) pyrroline-5-carboxylate synthetase (P5CS) through real time PCR and enzyme activity studies showed a strong positive correlation between VrP5CS gene expression, enzyme activity and proline accumulation in the roots of V. radiata under progressive drought and recovery. Drought-induced changes in root moisture content (RMC) showed positive linear

  12. Geomorphology and anthropogenic impact including military constraints in a microtidal wave-dominated embayment in south western Sardinia (Porto Pino beach, SCI ITB040025, Mediterranean Sea). Implications for beach management.

    Science.gov (United States)

    De Muro, Sandro; Buosi, Carla; Pusceddu, Nicola; Frongia, Paolo; Passarella, Marinella; Ibba, Angelo

    2016-04-01

    The coastal zones of the Mediterranean have undergone increasing pressure over the last century. The intensifying coastal development and the increasing tourist impact have led to an intense transformation of the coastlines and adjacent marine areas. The beach and the coastal dune play an important role in protecting the coastline. Thus, the study of its geomorphological evolution and of its anthropic modification is fundamental in order to adopt the best management practices. In this regard, the LIFE Project (LIFE13NAT/IT/001013) SOSS DUNES (Safeguard and management Of South-western Sardinian Dunes) aims to safeguard the dune habitats and the beach system in a site belonging to the Natura 2000 network, an EUwide network of nature protection areas established under the 1992 Habitats Directive. This project is focused on a microtidal wave-dominated embayment located in south western Sardinia (Italy, Mediterranean Sea) called Porto Pino beach comprised in the SCI (Site of Community Importance) "Promontory, dunes and wetland of Porto Pino (ITB040025)". This research aims to investigate the geomorphological processes, the evolution and the main human impacts on Porto Pino beach as an useful tool for both conservation and coastal management. The coastal area of Porto Pino is represented by sandy shorelines extending for a total length of 5 km characterized by a wide primary and secondary dune systems, a backshore wetland lagoon and marsh area arranged parallel to the coastline. This littoral area can be ideally divided into three parts: the first, about 600 m long, in the north-west part characterized by the highest human pressure due to touristic activity on the foredunes and deposition of beach wrack; the second part in the south-east, about 1100 m long, characterized by a complex dune system (primary and secondary foredunes); and the third southernmost part included in a military area, about 3300 m long, characterized by transgressive dune system with low human

  13. Desenvolvimento de sistema de apoio com depósito cerâmico para soldagem e processamento por atrito com pino não consumível

    Directory of Open Access Journals (Sweden)

    Tiago F. A. Santos

    2014-06-01

    Full Text Available A mesa suporte das peças a serem unidas normalmente se deforma durante o processo de soldagem por atrito com pino não consumível devido às altas cargas envolvidas. Consequentemente, a obtenção de juntas soldadas com penetração total, bem como a vida útil da amostra e da ferramenta podem ser afetadas, causando paradas não programadas e comprometendo a produtividade do processo e deslocando mão de obra para uma etapa de manutenção não prevista na cadeia do processo de soldagem. Este trabalho apresenta uma mesa de apoio com depósito cerâmico para o processamento e soldagem por atrito com pino não consumível. Para o desenvolvimento da mesa foram testados quatro depósitos cerâmicos, sob uma placa de aço, dos quais o de menor porosidade atingiu melhor desempenho. Essa mesa permitiu a realização de juntas soldadas com penetração completa de aços inoxidáveis duplex; resistir às altas cargas durante a soldagem de aços baixa liga alta resistência e realizar juntas dissimilares aço-alumínio, sem aderência do material mais macio à mesa suporte; bem como outras importantes características como confinar o calor e o metal plastificado, assim como determinar parâmetros de soldagem estáveis.

  14. Envidia, carcoma del alma: escorzo psico-literario

    Directory of Open Access Journals (Sweden)

    TERESA SÁNCHEZ SÁNCHEZ

    2004-01-01

    Full Text Available Desde Aristóteles hasta Castilla del Pino, desde Covarrubias hasta María Zambrano, desde el clasicismo grecolatino a la modernidad de los Simposiums de Psicología y Psicoanálisis, el tema de la envidia ha sido objeto de análisis. Tan sutiles matices provienen de la filosofía como de la psicología, de la literatura como de la clínica. La envidia es sometida a la mirada benevolente que exige su rango de emoción universal humana, derivada de la alteridad, la comparación y la autovaloración negativa, así como de la deficiente instalación narcisística y el anhelo de suplantación del otro idealizado. La envidia es antesala del odio y de un cortejo de expresiones interpersonales y sociales muy variadas y sibilinas. Anida, incluso, tras el choque de civilizaciones generador de los más atroces y destructivos episodios de fanatismo terrorista recientemente padecidos en nuestro mundo.

  15. Formation of post-fire water-repellent layers in Monterrey pine (Pinus radiata D. Don) plantations in south-central Chile

    Science.gov (United States)

    P. Garcia-Chevesich; R. Pizarro; C. L. Stropki; P. Ramirez de Arellano; P. F. Ffolliott; L. F. DeBano; Dan Neary; D. C. Slack

    2010-01-01

    A wildfire burned about 15,000 ha of Monterrey Pine (Pinus radiata D. Don) plantations near Yungay, Chile, in January of 2007. Post-fire water repellency (hydrophobicity) was measured using the water-drop-penetration-time (WDPT) method at depths of 0, 5, and 10 mm from the soil surface. These measurements were collected on burned sites of both young (4-years old) and...

  16. Proteomic analysis of Pinus radiata needles: 2-DE map and protein identification by LC/MS/MS and substitution-tolerant database searching.

    Science.gov (United States)

    Valledor, Luis; Castillejo, Maria A; Lenz, Christof; Rodríguez, Roberto; Cañal, Maria J; Jorrín, Jesús

    2008-07-01

    Pinus radiata is one of the most economically important forest tree species, with a worldwide production of around 370 million m (3) of wood per year. Current selection of elite trees to be used in conservation and breeding programes requires the physiological and molecular characterization of available populations. To identify key proteins related to tree growth, productivity and responses to environmental factors, a proteomic approach is being utilized. In this paper, we present the first report of the 2-DE protein reference map of physiologically mature P. radiata needles, as a basis for subsequent differential expression proteomic studies related to growth, development, biomass production and responses to stresses. After TCA/acetone protein extraction of needle tissue, 549 +/- 21 well-resolved spots were detected in Coommassie-stained gels within the 5-8 pH and 10-100 kDa M(r) ranges. The analytical and biological variance determined for 450 spots were of 31 and 42%, respectively. After LC/MS/MS analysis of in-gel tryptic digested spots, proteins were identified by using the novel Paragon algorithm that tolerates amino acid substitution in the first-pass search. It allowed the confident identification of 115 out of the 150 protein spots subjected to MS, quite unusual high percentage for a poor sequence database, as is the case of P. radiata. Proteins were classified into 12 or 18 groups based on their corresponding cell component or biological process/pathway categories, respectively. Carbohydrate metabolism and photosynthetic enzymes predominate in the 2-DE protein profile of P. radiata needles.

  17. Wood formation from the base to the crown in Pinus radiata: gradients of tracheid wall thickness, wood density, radial growth rate and gene expression

    Science.gov (United States)

    Sheree Cato; Lisa McMillan; Lloyd Donaldson; Thomas Richardson; Craig Echt; Richard Gardner

    2006-01-01

    Wood formation was investigated at five heights along the bole for two unrelated trees of Pinus radiataBoth trees showed clear gradients in wood properties from the base to the crown. Cambial cells at the base of the tree were dividing 3.3-fold slower than those at the crown, while the average thickness of cell walls in wood was highest at the base....

  18. EFFECTIVENESS OF A SUPERFICIAL TREATMENT USING BIFENTHRIN TO PROTECT RADIATA PINE FRAMING FROM DAMAGE BY SUBTERRANEAN AND DRYWOOD TERMITES IN INDONESIA

    Directory of Open Access Journals (Sweden)

    Paimin Sukartana

    2010-06-01

    Full Text Available Various experimental testing procedures were undertaken in Indonesia to determine the effectiveness of a patented superficial (envelope treatment using bifenthrin to protect radiata pine framing material from damage by two species of subterranean termites (Macrotermes gilvus and Coptotermes curvignathus and one species of drywood termite (Cryptotermes cynocephalus. Lengths of framing material (Pinus radiata sapwood were commercially treated to the targeted retention of 0.02% m/m of bifenthrin in the outer 2 mm depth penetration zone of the material. The treated and untreated materials were subsequently cut into test specimens and exposed to M. gilvus in the field and a semi-laboratory trial, to C. curvignathus in the laboratory and a semi-laboratory trial and to C. cynocephalus in a laboratory trial. No supplementary treatment was performed on the exposed cut ends of the treated test specimens. The results from the trials clearly demonstrated that the superficial treatment of bifenthrin seemed effective in protecting test specimens of radiata pine framing material from significant damage by Indonesia’s most notorious termite species that often causes serious economic loss to the timbers. Termites were unable to damage any of the bifenthrin-treated surfaces of test specimens. Any obser ved damage by termites, albeit minor, was in all cases confined to the exposed cut ends of test specimens. In contrast, attack by termites on the untreated control test specimens caused damage of the samples ranging from light to heavy.

  19. A comparison of estimation methods for fitting Weibull, Johnson's SB and beta functions to Pinus pinaster, Pinus radiata and Pinus sylvestris stands in northwest Spain

    Energy Technology Data Exchange (ETDEWEB)

    Gorgoseo, J. J.; Rojo, A.; Camara-Obregon, A.; Dieguez-Aranda, U.

    2012-07-01

    The purpose of this study was to compare the accuracy of the Weibull, Johnson's SB and beta distributions, fitted with some of the most usual methods and with different fixed values for the location parameters, for describing diameter distributions in even-aged stands of Pinus pinaster, Pinus radiata and Pinus sylvestris in northwest Spain. A total of 155 permanent plots in Pinus sylvestris stands throughout Galicia, 183 plots in Pinus pinaster stands throughout Galicia and Asturias and 325 plots in Pinus radiata stands in both regions were measured to describe the diameter distributions. Parameters of the Weibull function were estimated by Moments and Maximum Likelihood approaches, those of Johnson's SB function by Conditional Maximum Likelihood and by Knoebel and Burkhart's method, and those of the beta function with the method based on the moments of the distribution. The beta and the Johnson's SB functions were slightly superior to Weibull function for Pinus pinaster stands; the Johnson's SB and beta functions were more accurate in the best fits for Pinus radiata stands, and the best results of the Weibull and the Johnson's SB functions were slightly superior to beta function for Pinus sylvestris stands. However, the three functions are suitable for this stands with an appropriate value of the location parameter and estimation of parameters method. (Author) 44 refs.

  20. Natural parasitism of Diaphorina citri Kuwayama (Hemiptera, Psyllidae nymphs by Tamarixia radiata Waterston (Hymenoptera, Eulophidae in São Paulo orange groves

    Directory of Open Access Journals (Sweden)

    Paulo Eduardo Branco Paiva

    2012-12-01

    Full Text Available The psyllid Diaphorina citri Kuwayama 1908 has become the main citrus pest species in the state of São Paulo, Brazil, after the introduction of the huanglongbing or citrus greening. This study evaluated the parasitism of 3rd, 4th and 5th instar D. citri nymphs by Tamarixia radiata (Waterston, 1922 in citrus groves under a regimen of regular insecticide applications in ten producing regions: Araraquara, Barretos, Bauru, Botucatu, Franca, Itapetininga, Jaú, Limeira, Lins and São João da Boa Vista. Sixty-nine samples of new branches infested with nymphs of D. citri were collected from 2005 to 2008 in orange groves ranging from 1 to 20 years old, of the varieties Hamlin, Pera, Valencia and Natal. The parasitoid T. radiata is widely distributed in São Paulo orange groves, and was identified in 50 (72% of the samples, showing a mean parasitism rate of 12.4%. The highest parasitism rate was observed in the "summer" (from January through March, with a mean of 25.7%. Nymphal parasitism was above 90% in two samples. The probable causes of the variations in parasitism of D. citri by T. radiata are discussed.

  1. Estudio experimental de la alteración de la mojabilidad mediante el uso de un surfactante extraído del aceite del pino TOFA en el sistema crudo liviano/agua/SiO2

    Directory of Open Access Journals (Sweden)

    Hildemaro Meléndez

    2012-12-01

    Full Text Available It is known that much of the oil is trapped in reservoirs after use of conventional methods for oil extraction. However, several methods have been introduced to increase the recovery of this oil, one of them is through the alteration of the wettability. Methods suggested for this purpose include the use of chemical additives such as surfactants. In this work it was evaluated the technical feasibility of using a natural surfactant to alter the wettability of a system Oil/Water/SiO2, by measuring contact angles. The results show the feasibility of using natural surfactant alterative of wettability for mineral surfaces having different wet conditions (water -wet, intermediate or oil.

  2. Reducción de la biomasa del pino carrasco ("Pinus Halepensis") en un área del sureste semiárido peninsular como estrategia para evitar el estrés hídrico

    OpenAIRE

    Belmonte Serrato, Francisco; López Bermúdez, Francisco; Romero Díaz, María Asunción

    2008-01-01

    En las épocas de fuertes sequías, la vegetación mediterránea sufre un estado de estrés hídrico prolongado que le obliga a adoptar diversas estrategias de supervivencia, entre las que fi guran, como último recurso, y antes de llegar a superar su capacidad de resilencia, la reducción de la biomasa de hojas. En este trabajo se pone de manifi esto como algunos ejemplares de Pinus halepensis existentes en el área de estudio (el campo experimental de El Ardal, Murcia), redujeron apreciablemente su ...

  3. Productivity and cost of harvesting a stemwood biomass product from integrated cut-to-length harvest operations in Australian Pinus radiata plantations

    International Nuclear Information System (INIS)

    Walsh, D.; Strandgard, M.

    2014-01-01

    Significant quantities of woody biomass from the tops of trees and larger woody ‘waste’ pieces that fall outside existing sawlog and pulpwood specifications are left on site post final harvest in Australian radiata Pinus radiata (D. Don) (radiata pine) plantations. Woody biomass is a potential product for pulp making or energy generation. Commercial use of woody biomass from radiata pine plantations would add extra value to the Australian plantation estate through improved resource utilisation, and potentially reduced post-harvesting silvicultural costs. This study investigated the productivity and cost impact of the harvest and extraction to roadside of woody biomass in an integrated harvest operation in a typical Australian two machine (harvester/processor and forwarder), cut-to-length, clearfall operation in a mature, thinned radiata pine plantation. The harvest operation yielded 23 GMt/ha (5% of the total yield) of woody biomass (known as ‘fibreplus’), 443 GMt/ha of sawlogs and 28 GMt/ha of pulpwood. The mean quantity of biomass left on site was 128 GMt/ha, mainly consisting of branches and needles, sufficient to minimise nutrient loss and protect the soil from erosion. Woodchips derived from the fibreplus product were suitable for kraft pulp making, (when blended in small amounts with clean de-barked roundwood woodchips), and for energy generation. The method trialed with the fibreplus product being produced did not impact harvesting and processing productivity and costs, but extraction was 14% less productive. Through analysis of the productivities of each phase and development of a cost model the harvest and extraction of the fibreplus product was estimated to increase total unit costs by ∼4.9%. - Highlights: • Study of the productivity and cost impact of producing a woody biomass product. • We compared two scenarios – harvesting with and without the biomass product. • An additional 23 GMt/ha (5% of the total yield) of woody biomass

  4. COMPORTAMIENTO DEL CRECIMIENTO EN ALTURA DE Hibiscus elatus Sw CULTIVADA EN CONTENEDORES

    Directory of Open Access Journals (Sweden)

    M. Cobas-López

    2003-01-01

    Full Text Available Hibiscus elatus Sw. (majagua es una especie nativa de Cuba, incluida en los planes de reforestación del país por su importancia económica, ecológica y su condición de ser una madera preciosa. En el trabajo se describe el comportamiento en vivero del crecimiento en altura de la especie, cultivada en contenedores. Se utilizaron cuatro tipos de sustratos, que fueron los siguientes: S1- Turba (40 %, humus de lombriz (40 % y corteza de pino compostada (20 %; S2- Estiércol de caballo (45 %, composta (40 %, y humus de lombriz (15 %; S3- Humus de lombriz (30 %, composta (25 %, turba (25 %, y estiércol de caballo (20 %; S4- Testigo, consistente en suelo proveniente de una plantación de la especie. A través del análisis de regresión se probaron nueve modelos matemáticos del tipo y = f (x, polinómicos, exponenciales y logarítmicos. De acuerdo con el coeficiente de determinación obtenido, del análisis de residuos y la validación de los modelos, se comprobó que la función que mejor representa el crecimiento en altura de Hibiscus elatus Sw., para los sustratos estudiados fue b t y b e 1 = 0 + .

  5. Natural parasitism of Diaphorina citri Kuwayama (Hemiptera, Psyllidae nymphs by Tamarixia radiata Waterston (Hymenoptera, Eulophidae in São Paulo orange groves Parasitismo natural de ninfas de Diaphorina citri Kuwayama (Hemiptera, Psyllidae por Tamarixia radiata Waterston (Hymenoptera, Eulophidae em pomares de laranja em São Paulo

    Directory of Open Access Journals (Sweden)

    Paulo Eduardo Branco Paiva

    2012-12-01

    Full Text Available The psyllid Diaphorina citri Kuwayama 1908 has become the main citrus pest species in the state of São Paulo, Brazil, after the introduction of the huanglongbing or citrus greening. This study evaluated the parasitism of 3rd, 4th and 5th instar D. citri nymphs by Tamarixia radiata (Waterston, 1922 in citrus groves under a regimen of regular insecticide applications in ten producing regions: Araraquara, Barretos, Bauru, Botucatu, Franca, Itapetininga, Jaú, Limeira, Lins and São João da Boa Vista. Sixty-nine samples of new branches infested with nymphs of D. citri were collected from 2005 to 2008 in orange groves ranging from 1 to 20 years old, of the varieties Hamlin, Pera, Valencia and Natal. The parasitoid T. radiata is widely distributed in São Paulo orange groves, and was identified in 50 (72% of the samples, showing a mean parasitism rate of 12.4%. The highest parasitism rate was observed in the "summer" (from January through March, with a mean of 25.7%. Nymphal parasitism was above 90% in two samples. The probable causes of the variations in parasitism of D. citri by T. radiata are discussed.O psilídeo Diaphorina citri Kuwayama 1908 tornou-se a principal praga dos citros no estado de São Paulo após a introdução do huanglongbing ou grenning dos citros. Este estudo avaliou as proporções de ninfas de terceiro a quinto ínstares de D. citri parasitadas por Tamarixia radiata (Waterston, 1922 em pomares de laranja submetidos a pulverizações constantes de inseticidas em dez regiões produtoras, Araraquara, Barretos, Bauru, Botucatu, Franca, Itapetininga, Jaú, Limeira, Lins e São João da Boa Vista. Foram coletadas 69 amostras de ramos jovens infestados com ninfas de D. citri obtidas entre 2005 e 2008 em pomares de 1 a 20 anos de idade, das cultivares Hamilin, Pera, Valencia e Natal. O parasitóide T. radiata encontra-se amplamente distribuído em pomares de São Paulo, tendo sido observado em 50 amostras (72%, com taxa média de

  6. Black woodpecker Dryocopus martius (L., 1758 distribution, abundance, habitatuse and breeding performance in a recentlycolonized region in SW Europe

    Directory of Open Access Journals (Sweden)

    Olano, M., Aierbe, T., Beñaran, H., Hurtado, R., Ugarte, Urruzola, A., Vázquez, J., Ansorregi, F., Galdos, A. ... [et al.

    2015-01-01

    localidades potenciales utilizando inventarios forestales, y cada localidad fue visitada durante el periodo enero-marzo. Las localidades ocupadas se consideraron “dominios vitales reproductivos” cuando se pudo comprobar el emparejamiento o la nidificación, o cuando se registró presencia de individuos en un mínimo de tres visitas consecutivas. Se vigiló el desarrollo de la reproducción en nidos activos durante mayo y junio. Se detectaron y cartografiaron 21 "dominios vitales reproductivos", distribuidos fundamentalmente a lo largo de las franjas oriental y meridional del área de estudio. Las determinantes ambientales relacionadas positivamente con la presencia de "dominios vitales reproductivos" fueron elevada cobertura arbolada, estructura madura, superficies de haya Fagus sylvatica, bosque mixto caducifolio y pino laricio Pinus nigra, y parcelas forestales poco fragmentadas. Las plantaciones de pino de Monterrey P. radiata y las alturas bajas del arbolado se seleccionaron negativamente. Las parcelas de alimentación preferidas incluyeron proporciones de roble americano Quercus rubra y plantaciones de pino laricio. Se detectaron trece nidos activos. Todos los nidos salvo dos fueron excavados en hayas. El éxito de cría fue elevado (92% pero la tasa de vuelo (1.8 estuvo por debajo de los promedios descritos en Europa, lo que podría indicar limitaciones intrínsecas en esta población periférica.

  7. Contenido de nutrientes e inoculación con hongos ectomicorrízicos comestibles en dos pinos neotropicales Nutrient contents and inoculation with edible ectomycorrhizal fungi on two neotropical pines

    Directory of Open Access Journals (Sweden)

    VIOLETA CARRASCO-HERNÁNDEZ

    2011-03-01

    Full Text Available Un alto porcentaje de mortalidad se presenta en plántulas de pinos que son trasplantados de vivero a campo, debido a que no poseen hongos ectomicorrízicos los cuales forman simbiosis obligada con las plantas de forma natural en los bosques. Estos hongos facilitan la absorción de nutrientes y agua, además de estimular su crecimiento. Debido a la importancia ecológica y fisiológica de los hongos ectomicorrízicos, el presente trabajo evaluó el efecto en crecimiento, peso seco, porcentaje de colonización y contenido de nutrientes de la inoculación de seis especies ectomicorrízicas comestibles de los géneros Lacearía y Hebeloma en Pinus patula Schiede ex Schltdl. & Cham. y P. pseudostrobus Lindl., en condiciones de invernadero. Después de 397 días de la siembra se observó un efecto benéfico en el crecimiento de ambos pinos como resultado de la inoculación en términos de peso seco en parte aérea y radical, así como un mayor contenido de N, P y K. El porcentaje de micorrización en plantas inoculadas con las especies fúngicas varió de 57 % a 90 %. Cuando se efectuó inoculación combinada de especies ectomicorrízicas, se registró dominancia de una de las especies inoculadas, en términos de colonización radical. En estos tratamientos con inoculación simultánea, los efectos benéficos registrados en los hospederos fueron comparables a los observados cuando se inoculó de manera individual a las especies fúngicas dominantes. En función de los resultados encontrados se recomienda en el establecimiento de plantaciones forestales la inoculación de ambas especies de pinos con especies de hongos de los géneros Laccaria y Hebeloma.A high percentage of mortality appears in pine seedlings transplanted from nursery to field, due to the fact that they lack ectomycorrhizal fungi which form obligated symbiosis with plants in natural conditions in the forests. These fungi facilitate the absorption of nutrients and water, and therefore

  8. Reproductive toxicity of chromium in adult bonnet monkeys (Macaca radiata Geoffrey). Reversible oxidative stress in the semen

    International Nuclear Information System (INIS)

    Subramanian, Senthivinayagam; Rajendiran, Gopalakrishnan; Sekhar, Pasupathi; Gowri, Chandrahasan; Govindarajulu, Pera; Aruldhas, Mariajoseph Michael

    2006-01-01

    The present study was designed to test the hypothesis that oxidative stress mediates chromium-induced reproductive toxicity. Monthly semen samples were collected from adult monkeys (Macaca radiata), which were exposed to varying doses (50, 100, 200 and 400 ppm) of chromium (as potassium dichromate) for 6 months through drinking water. Chromium treatment decreased sperm count, sperm forward motility and the specific activities of antioxidant enzymes, superoxide dismutase and catalase, and the concentration of reduced glutathione in both seminal plasma and sperm in a dose- and duration-dependent manner. On the other hand, the quantum of hydrogen peroxide in the seminal plasma/sperm from monkeys exposed to chromium increased with increasing dose and duration of chromium exposure. All these changes were reversed after 6 months of chromium-free exposure period. Simultaneous supplementation of vitamin C (0.5 g/L; 1.0 g/L; 2.0 g/L) prevented the development of chromium-induced oxidative stress. Data support the hypothesis and show that chronic chromium exposure induces a reversible oxidative stress in the seminal plasma and sperm by creating an imbalance between reactive oxygen species and antioxidant system, leading to sperm death and reduced motility of live sperm

  9. Effects of chemical and biological pesticides on plant growth parameters and rhizospheric bacterial community structure in Vigna radiata

    Energy Technology Data Exchange (ETDEWEB)

    Singh, Sunil; Gupta, Rashi; Sharma, Shilpi, E-mail: shilpi@dbeb.iitd.ac.in

    2015-06-30

    Highlights: • Non-target effects of pesticides employing qualitative and quantitative approaches. • Qualitative shifts in resident and active bacterial community structure. • Abundance of 16S rRNA gene and transcripts were reduced significantly. • Effects of biological pesticide similar to chemical pesticides on rhizospheric bacteria. - Abstract: With increasing application of pesticides in agriculture, their non-target effects on soil microbial communities are critical to soil health maintenance. The present study aimed to evaluate the effects of chemical pesticides (chlorpyrifos and cypermethrin) and a biological pesticide (azadirachtin) on growth parameters and the rhizospheric bacterial community of Vigna radiata. Qualitative and quantitative analysis by PCR-denaturing gradient gel electrophoresis (DGGE) and q-PCR, respectively, of the 16S rRNA gene and transcript were performed to study the impact of these pesticides on the resident and active rhizospheric bacterial community. While plant parameters were not affected significantly by the pesticides, a shift in the bacterial community structure was observed with an adverse effect on the abundance of 16S rRNA gene and transcripts. Chlorpyrifos showed almost complete degradation toward the end of the experiment. These non-target impacts on soil ecosystems and the fact that the effects of the biopesticide mimic those of chemical pesticides raise serious concerns regarding their application in agriculture.

  10. Stable carbon and oxygen isotope ratios of annual rings of pinus radiata provide an integrative record of canopy gas exchange

    International Nuclear Information System (INIS)

    Barbour, M.M.; Farquhar, G.D.

    2000-01-01

    Full text: Seasonal variation in δ 13 C and δ 18 O of cellulose from annual rings of Pinus radiata growing at each of three sites in New Zealand was measured. The three sites differed in annual water balance, temperature, and vapour pressure deficit, and these differences were reflected in cellulose δ 13 C and δ 18 O. Specific events such as drought or heavy rain were recorded as peaks and troughs in enrichment. A canopy-level combined photosynthesis and conductance model was linked to a model of soil water content and δ 18 O of xylem water to allow daily prediction of δ 13 C and δ 18 O of cellulose. A photosynthesis-weighted average of δ 13 C and δ 18 O was calculated for each sampling period. Each sample represented between 3 and 30 days, depending on stem growth rate. The timing and amplitude of changes in δ 13 C were predicted accurately by the model, while general seasonal patterns and event related peaks in δ 18 O enrichment were well predicted. These results suggest that stable isotope ratios of cellulose from annual rings reflect the canopy response to interactions between site-specific and seasonal variation in climatic conditions and soil water availability

  11. The carbon budget of Pinus radiata plantations in south-western Australia under 4 climate change scenarios

    International Nuclear Information System (INIS)

    Simioni, G.; Ritson, P.; McGrath, J.; Dumbrell, I.; Copeland, B.

    2009-01-01

    The future stem wood production and net ecosystem production of Pinus radiata plantations in southwestern Australia were estimated in this modelling study, which was conducted in order to determine the potential effects of anticipated severe rainfall reductions in the region. Four climate change and emission scenarios were considered as well as simulations of the present climate. Results of the study showed that stem wood production and NEP were not significantly influenced by moderate changes in temperature. However, stem wood production and NEP decreased significantly under the most pessimistic climate change scenarios. Results of the study suggested that a trade-off between the positive effects of rising atmospheric carbon dioxide (CO 2 ) on plant and water use efficiency and the negative impacts of decreased rainfall and increased temperatures. Changes in heterotrophic respiration lagged behind changes in plant growth. It was concluded that realistic predictions of forest production and carbon sequestration potential will require modelling tools capable of characterizing interactions between environmental variables, plant physiology and soil organic matter decomposition, as well as the potential range of climate change scenarios. 53 refs., 4 tabs., 9 figs

  12. Effects of chemical and biological pesticides on plant growth parameters and rhizospheric bacterial community structure in Vigna radiata.

    Science.gov (United States)

    Singh, Sunil; Gupta, Rashi; Sharma, Shilpi

    2015-06-30

    With increasing application of pesticides in agriculture, their non-target effects on soil microbial communities are critical to soil health maintenance. The present study aimed to evaluate the effects of chemical pesticides (chlorpyrifos and cypermethrin) and a biological pesticide (azadirachtin) on growth parameters and the rhizospheric bacterial community of Vigna radiata. Qualitative and quantitative analysis by PCR-denaturing gradient gel electrophoresis (DGGE) and q-PCR, respectively, of the 16S rRNA gene and transcript were performed to study the impact of these pesticides on the resident and active rhizospheric bacterial community. While plant parameters were not affected significantly by the pesticides, a shift in the bacterial community structure was observed with an adverse effect on the abundance of 16S rRNA gene and transcripts. Chlorpyrifos showed almost complete degradation toward the end of the experiment. These non-target impacts on soil ecosystems and the fact that the effects of the biopesticide mimic those of chemical pesticides raise serious concerns regarding their application in agriculture. Copyright © 2015 Elsevier B.V. All rights reserved.

  13. Fourier transform infrared imaging and microscopy studies of Pinus radiata pulps regarding the simultaneous saccharification and fermentation process

    Energy Technology Data Exchange (ETDEWEB)

    Castillo, Rosario del P., E-mail: rosariocastillo@udec.cl [Faculty of Pharmacy, University of Concepcion, Concepcion (Chile); Biotechnology Center, University of Concepcion, Concepcion (Chile); Araya, Juan [Faculty of Pharmacy, University of Concepcion, Concepcion (Chile); Biotechnology Center, University of Concepcion, Concepcion (Chile); Troncoso, Eduardo [Consorcio Bioenercel S.A, University of Concepcion, Concepcion (Chile); Vinet, Silenne; Freer, Juanita [Biotechnology Center, University of Concepcion, Concepcion (Chile); Faculty of Chemical Sciences, University of Concepcion, Concepcion (Chile)

    2015-03-25

    The distribution and chemical patterns of lignocellulosic components at microscopic scale and their effect on the simultaneous saccharification and fermentation process (SSF) in the production of bioethanol from Pinus radiata pulps were analyzed by the application of diverse microscopical techniques, including scanning electronic microscopy (SEM), confocal laser scanning microscopy (CLSM) and attenuated total reflectance (ATR) – Fourier transform infrared microspectroscopy. This last technique was accompanied with multivariate methods, including principal component analysis (PCA) and multivariate curve resolution with alternating least squares (MCR-ALS) to evaluate the distribution patterns and to generate pure spectra of the lignocellulosic components of fibers. The results indicate that the information obtained by the techniques is complementary (ultrastructure, confocality and chemical characterization) and that the distribution of components affects the SSF yield, identifying lignin coalescence droplets as a characteristic factor to increase the SSF yield. Therefore, multivariate analysis of the infrared spectra enabled the in situ identification of the cellulose, lignin and lignin-carbohydrates arrangements. These techniques could be used to investigate the lignocellulosic components distribution and consequently their recalcitrance in many applications where minimal sample manipulation and microscale chemical information is required.

  14. Tolerance and toxicity levels of boron in mung bean (vigna radiata (l.) wilczek) cultivars at early growth stages

    International Nuclear Information System (INIS)

    Hasnain, A.; Mahmood, S.; Akhtar, S.; Malik, S.A.; Bashir, N.

    2011-01-01

    Boron (B) toxicity has been recognized as a serious problem in arid and semi arid regions of the world. This study was aimed to determine critical levels of B by studying phenotypic variation for B-tolerance/ toxicity at the germination and seedling stage in three mung bean (Vigna radiata) cultivars; M-6, M-8 and 96009. Boron levels ranging from 0-20 ppm were applied using Boric acid. Germination, growth and photosynthetic attributes were significantly (p<0.001) influenced by varying B levels. However, the cultivars were significantly invariable for germination, seedling height and leaf number. B levels (5-10 ppm) appeared to be nutritionally critical whereas, 15-20 ppm induced B toxicity. The toxicity was expressed in terms of reduction in plant's growth as well as by visible symptoms which included chlorosis and necrosis of the foliage. The present study also demonstrated variation in B tolerance at the seedling stage in these cultivars. Among the tested cultivars, M-6 and M-8 exhibited better growth responses as compared with 96009. Fresh biomass and shoot: root ratio appeared to serve as selection criteria for B tolerance. The study further suggested screening of cultivars/ accessions on a large scale to explore more diversity of traits as well as the use of biochemical markers for mechanistic understanding of B tolerance. (author)

  15. Effects of chemical and biological pesticides on plant growth parameters and rhizospheric bacterial community structure in Vigna radiata

    International Nuclear Information System (INIS)

    Singh, Sunil; Gupta, Rashi; Sharma, Shilpi

    2015-01-01

    Highlights: • Non-target effects of pesticides employing qualitative and quantitative approaches. • Qualitative shifts in resident and active bacterial community structure. • Abundance of 16S rRNA gene and transcripts were reduced significantly. • Effects of biological pesticide similar to chemical pesticides on rhizospheric bacteria. - Abstract: With increasing application of pesticides in agriculture, their non-target effects on soil microbial communities are critical to soil health maintenance. The present study aimed to evaluate the effects of chemical pesticides (chlorpyrifos and cypermethrin) and a biological pesticide (azadirachtin) on growth parameters and the rhizospheric bacterial community of Vigna radiata. Qualitative and quantitative analysis by PCR-denaturing gradient gel electrophoresis (DGGE) and q-PCR, respectively, of the 16S rRNA gene and transcript were performed to study the impact of these pesticides on the resident and active rhizospheric bacterial community. While plant parameters were not affected significantly by the pesticides, a shift in the bacterial community structure was observed with an adverse effect on the abundance of 16S rRNA gene and transcripts. Chlorpyrifos showed almost complete degradation toward the end of the experiment. These non-target impacts on soil ecosystems and the fact that the effects of the biopesticide mimic those of chemical pesticides raise serious concerns regarding their application in agriculture

  16. Arseno-sugars from brown kelp (Ecklonia radiata) as intermediates in cycling of Arsenic in a marine ecosystem

    Energy Technology Data Exchange (ETDEWEB)

    Edmonds, J S; Francesconi, K A

    1981-02-12

    The high concentration (relative to seawater) of arsenic in many marine animals eaten as human food has stimulated interest in the cycling of arsenic in the marine environment. Although arsenic is present in arsenobetaine ((CH/sub 3/)/sub 3/As/sup +/CH/sub 2/COO/sup -/) in the wester rock lobster (Panulirus cygnus), the dusky shark (Carcharhinus obscurus) and the school whiting (Sillago bassensis) it is not clear what intermediate stages are involved in the biosynthesis of this compound from arsenate, the major form of arsnenic in seawater. We now report the isolation of the two main arsenical constituents of the brown kelp, Ecklonia radiata, and their identification as a 2-hydroxy-3-sulphopropyl-5-deoxy-5-(dimethylarsenoso)furanoside and a 2,3-dihydroxypropyl-5-deoxy-5-(dimethylarsenoso)furanoside. A ..beta..-ribo structure for the sugar system is strongly indicated in each case. Ecklonia is the major organisms that concentrates arsenic in the coastal ecosystem to which the western rock lobster and school whiting belong. It is clear that the compounds described here could readily be further metabolized to arsenobetaine and may well be the source of arsenobetaine in marine fauna associated with the region.

  17. Toxicological features of maleilated polyflavonoids from Pinus radiata (D. Don.) as potential functional additives for biomaterials design.

    Science.gov (United States)

    García, Danny E; Medina, Paulina A; Zúñiga, Valentina I

    2017-11-01

    Polyflavonoids from Pinus radiata (D. Don.) are an abundant natural oligomers highly desirable as renewable chemicals. However, structural modification of polyflavonoids is a viable strategy in order to use such polyphenols as macrobuilding-blocks for biomaterial design. Polyflavonoids were esterified with three five-member cyclic anhydrides (maleic, itaconic, and citraconic) at 20 °C during 24 h in order to diversify physicochemical-, and biological-properties for agricultural, and food-packaging applications. In addition, the influence of the chemical modification, as well as the chemical structure of the grafting on toxicological features was evaluated. Structural features of derivatives were analyzed by spectroscopy (FT-IR and 1 H-NMR), and the degree of substitution was calculated. Toxicological profile was assessed by using three target species in a wide range of concentration (0.01-100 mgL - 1 ). Effect of polyflavonoids on the growth rate (Selenastrum capricornutum), mortality (Daphnia magna), and germination and radicle length (Lactuca sativa) was determined. Chemical modification affects the toxicological profile on the derivatives in a high extent. Results described remarkable differences in function of the target specie. The bioassays indicate differences of the polyflavonoids toxicological profile associated to the chemical structure of the grafting. Results allowed conclude that polyflavonoids from pine bark show slight toxic properties. Copyright © 2017 Elsevier Ltd. All rights reserved.

  18. Distribution and movement of nutrients and metals in a Pinus radiata forest soil following applications of biosolids

    International Nuclear Information System (INIS)

    McLaren, Ronald G.; Clucas, Lynne M.; Speir, Tom W.; Schaik, Andrew P. van

    2007-01-01

    Samples of biosolids, spiked with increasing amounts of Cu, Ni or Zn were applied to field plots in a Pinus radiata forest, and the nutrient and metal status of the forest litter and underlying mineral soil was monitored over a period of six years following application. The macronutrient status of the forest litter was changed markedly by the biosolids application, with substantial increases in N, P and Ca concentrations, and decreases in Mg and K. The C/N ratio of the litter was also decreased and pH was increased by the biosolids application. The metals applied with the biosolids were retained predominantly in the litter layer, and even with non-metal-spiked biosolids there were substantial increases in litter metal concentrations. There was also firm evidence of some movement of Cu, Ni and Zn into the underlying mineral soil. The potential environmental issues resulting from these changes in nutrient and metal status are discussed. - Biosolids application to forest soils results in substantial build-up of macronutrients and metals in the forest litter layer

  19. Distribution and movement of nutrients and metals in a Pinus radiata forest soil following applications of biosolids

    Energy Technology Data Exchange (ETDEWEB)

    McLaren, Ronald G. [Centre for Soil and Environmental Quality, Agriculture and Life Sciences Division, P.O. Box 84, Lincoln University Canterbury (New Zealand)]. E-mail: mclaren@lincoln.ac.nz; Clucas, Lynne M. [Centre for Soil and Environmental Quality, Agriculture and Life Sciences Division, P.O. Box 84, Lincoln University Canterbury (New Zealand); Speir, Tom W. [Institute of Environmental Science and Research Ltd, P.O. Box 50348, Porirua (New Zealand); Schaik, Andrew P. van [Institute of Environmental Science and Research Ltd, P.O. Box 50348, Porirua (New Zealand)

    2007-05-15

    Samples of biosolids, spiked with increasing amounts of Cu, Ni or Zn were applied to field plots in a Pinus radiata forest, and the nutrient and metal status of the forest litter and underlying mineral soil was monitored over a period of six years following application. The macronutrient status of the forest litter was changed markedly by the biosolids application, with substantial increases in N, P and Ca concentrations, and decreases in Mg and K. The C/N ratio of the litter was also decreased and pH was increased by the biosolids application. The metals applied with the biosolids were retained predominantly in the litter layer, and even with non-metal-spiked biosolids there were substantial increases in litter metal concentrations. There was also firm evidence of some movement of Cu, Ni and Zn into the underlying mineral soil. The potential environmental issues resulting from these changes in nutrient and metal status are discussed. - Biosolids application to forest soils results in substantial build-up of macronutrients and metals in the forest litter layer.

  20. Fourier transform infrared imaging and microscopy studies of Pinus radiata pulps regarding the simultaneous saccharification and fermentation process

    International Nuclear Information System (INIS)

    Castillo, Rosario del P.; Araya, Juan; Troncoso, Eduardo; Vinet, Silenne; Freer, Juanita

    2015-01-01

    The distribution and chemical patterns of lignocellulosic components at microscopic scale and their effect on the simultaneous saccharification and fermentation process (SSF) in the production of bioethanol from Pinus radiata pulps were analyzed by the application of diverse microscopical techniques, including scanning electronic microscopy (SEM), confocal laser scanning microscopy (CLSM) and attenuated total reflectance (ATR) – Fourier transform infrared microspectroscopy. This last technique was accompanied with multivariate methods, including principal component analysis (PCA) and multivariate curve resolution with alternating least squares (MCR-ALS) to evaluate the distribution patterns and to generate pure spectra of the lignocellulosic components of fibers. The results indicate that the information obtained by the techniques is complementary (ultrastructure, confocality and chemical characterization) and that the distribution of components affects the SSF yield, identifying lignin coalescence droplets as a characteristic factor to increase the SSF yield. Therefore, multivariate analysis of the infrared spectra enabled the in situ identification of the cellulose, lignin and lignin-carbohydrates arrangements. These techniques could be used to investigate the lignocellulosic components distribution and consequently their recalcitrance in many applications where minimal sample manipulation and microscale chemical information is required

  1. Yield and Yield Components of Vetch (Vigna radiata as Affected by the Use of Vermicompost and Phosphate Bio-fertilizer

    Directory of Open Access Journals (Sweden)

    Mohammad Mehdi Rahimi

    2016-06-01

    Full Text Available To evaluate the effects different levels of phosphate biofertilizer barvar-2 and vermi compost on yield and yield components of vetch plant (Vigna radiata L.in Yasouj a factorial experiments was performed in completely randomized design in crop year of 2013. Experimental treatments were phosphate biofertilizer barvar-2 at 3 levels (0, 50, 100 gram per hectare and vermicompost at 4 levels (0, 10, 20, 30 ton per hectare. In this study stem height, root length, biological yield, seed yield and harvest index was measured. ANOVA and comparison of means showed that vermicompost significantly increased stem height, economic and biological yields. Results, also, indicated that highest yield and biomass, 4.3 and 18.8 g/plant, observed respectively when 100 g/ha of barvar-2 and 30 t/ha of vermi compost were used. Using both of phosphate biofertilizer barvar-2 and vermicompost was better than their individnal usage. This indicates that combined use of these 2 factors would produce higher yield. It can be concluded that application of 100 g/ha of barvar-2 and 30 t/ha of vermicompost would a proper recommendation.

  2. Acetylcholineestarase-inhibiting alkaloids from Lycoris radiata delay paralysis of amyloid beta-expressing transgenic C. elegans CL4176.

    Directory of Open Access Journals (Sweden)

    Lijuan Xin

    Full Text Available The limited symptom relief and side effects of current Alzheimer's disease (AD medications warrant urgent discovery and study of new anti-AD agents. The "cholinergic hypothesis" of AD prompts us to search for plant-derived acetylcholineesterase (AChE inhibitors such as galanthamine that has been licensed in Europe for AD treatment. We used the unique amyloid β-expressing transgenic C. elegans CL4176, which exhibits paralysis when human Aβ1-42 is induced, to study two natural benzylphenethylamine alkaloids isolated from Lycoris radiata (L' Her. Herb, galanthamine and haemanthidine, and their synthetic derivatives 1,2-Di-O-acetyllycorine and 1-O-acetyllycorine for their anti-paralysis effects. Our data indicate that these Lycoris compounds effectively delay the paralysis of CL4176 worms upon temperature up-shift, and prolong the lives of these transgenic worms. Lycoris compounds were shown to significantly inhibit the gene expression of ace-1 and ace-2. Additionally, the Lycoris compounds may modulate inflammatory and stress-related gene expressions to combat the Aβ-toxicity in C. elegans.

  3. Metabolism of 14C-aspartate during shoot bud formation in cultured cotyledon explants of radiata pine

    International Nuclear Information System (INIS)

    Konschuh, M.N.; Thorpe, T.A.

    1997-01-01

    Aspartate metabolism was investigated in excised cotyledons of radiata pine (Pinus radiate D. Don). These cotyledons were cultured under shoot-forming (plus N 6 -benzyladenine, SF), non-shoot-forming (minus N 6 -benzyladenine, NSF) and unresponsive (plus N 6 -benzyladenine, OLD) conditions, then incubated with [ 14 C]-aspartate for 3-h pulse treatments followed by 3-h chase treatments with cold aspartate. The majority of label was recovered in the CO 2 , amino acid, organic acid and pellet fractions. Uptake was greatest in all tissue types early in culture. Most (over 80%) of the [ 14 C 9-aspartate taken up by the tissues was converted to CO 2 at day 0 in SF and NSF tissues. CO 2 accounted for less than 50% of the total radioactivity in other tissues. Greater incorporation into fractions was observed in SF tissues during promeristemoid formation, while in NSF tissues the greatest incorporation was observed during a period of rapid elongation. Generally, less incorporation was observed in OLD cotyledons than in SF and NSF cotyledons. Analysis of the amino acid fraction showed that labelled aspartate was converted to other amino acids, mainly glutamate, glutamine, asparagine and 4-aminobutyric acid. (au)

  4. Economic evaluation (quantitative for Mung bean (Vigna radiata production in the Kamin Region, Sadat Shahr, Fars province

    Directory of Open Access Journals (Sweden)

    Mahmood Reza Sadikhani

    2016-11-01

    Full Text Available Although one of the biggest disadvantages of an economic evaluation, is volatility of price and instability of economic conditions, But for land use planning, economic considerations play a key role in land use and making decision. Cost is an important factor that encourage farmers to grow special crop. Thus, in addition to the qualitative and quantitative evaluation, Land Suitability can be based on net or gross profit per unit area of land to be assessed in economic terms. The economic evaluation is based on net income or gross income from the land. The purpose of this study was to assess the economic evaluation for part of Saadat Shahr (Kamin region for Mung bean (Vigna radiata. 8 drilled profiles in order to see the profiles were chosen and after collecting data on real output, the variable cost of producing the product and the critical values and estimated gross profit are calculated and land suitability classes were determined. The results showed that one unit has a moderate suitability (S2 and two units have suitable classes (S1 from separate units.

  5. The mitochondrial genome of the legume Vigna radiata and the analysis of recombination across short mitochondrial repeats.

    Directory of Open Access Journals (Sweden)

    Andrew J Alverson

    2011-01-01

    Full Text Available The mitochondrial genomes of seed plants are exceptionally fluid in size, structure, and sequence content, with the accumulation and activity of repetitive sequences underlying much of this variation. We report the first fully sequenced mitochondrial genome of a legume, Vigna radiata (mung bean, and show that despite its unexceptional size (401,262 nt, the genome is unusually depauperate in repetitive DNA and "promiscuous" sequences from the chloroplast and nuclear genomes. Although Vigna lacks the large, recombinationally active repeats typical of most other seed plants, a PCR survey of its modest repertoire of short (38-297 nt repeats nevertheless revealed evidence for recombination across all of them. A set of novel control assays showed, however, that these results could instead reflect, in part or entirely, artifacts of PCR-mediated recombination. Consequently, we recommend that other methods, especially high-depth genome sequencing, be used instead of PCR to infer patterns of plant mitochondrial recombination. The average-sized but repeat- and feature-poor mitochondrial genome of Vigna makes it ever more difficult to generalize about the factors shaping the size and sequence content of plant mitochondrial genomes.

  6. Estudo da microestrutura formada no processo de soldagem por atrito em aço C-Mn com pino consumível Microstructural evaluation of a C-Mn steel welded by the friction hidro-pillar process

    Directory of Open Access Journals (Sweden)

    Cleber Rodrigo de Lima Lessa

    2011-03-01

    Full Text Available A soldagem por arco elétrico é a técnica mais empregada para reparar estruturas de grande porte, mas apresenta desvantagens associadas à solidificação do metal de solda. Então a utilização de processos de solda por atrito, especificamente o processo FHPP (Friction Hydro Pillar Processing que consiste na utilização de pinos para reparo por atrito, apresenta vantagens por ser um processo realizado no estado sólido. Menores temperaturas estão envolvidas e não existe influência do ambiente externo, minimizando os problemas nos reparos estruturais. Este trabalho teve como objetivo observar a variação dos parâmetros do processo e os efeitos desses na microestrutura e qualidade do reparo. O estudo comparou diferentes forças axiais nos reparos com aço C-Mn através de metalografias e perfis de microdureza. Uma força axial maior resultou em um menor tempo de processo, em uma microestrutura mais homogênea e evitou os defeitos "falta de adesão" na zona de ligação e "cisalhamento a quente" do pino.The arc welding it is the most used technique to repair large structures, however, has disadvantages that result from the solidification of the weld metal. So the use of friction welding, specifically the FHPP (friction hydro pillar processing process that consists on using plugs for friction repair, presents advantages because it is a process that is carried out on the solid state. Lower temperatures are involved and do not have the influence of the external environment, minimizing the problems on structure repairs. This work has the objective of observe the process parameters variation and their effects on microstructure and on the quality of the repair. The study compared different axial forces on repairs whit C-Mn steel through of metallographic and microhardness profiles. A higher axial force results in less time of process, in a more homogeneous microstructure, and avoided the defects "noncompliance" in the bounding zone and "hot

  7. Osteossíntese de úmero em pombos domésticos (Columba livia associando-se pinos metálicos e polimetilmetacrilato intramedulares após osteotomia diafisária Humerus osteosynthesis using intramedullary pins and polymethylmethacrylate in domestic pigeons (Columba livia

    Directory of Open Access Journals (Sweden)

    M.M. Alievi

    2008-08-01

    Full Text Available Foram utilizadas 28 aves adultas, separadas aleatoriamente em quatro grupos. Os pombos foram anestesiados com isoflurano para a realização da osteotomia diafisária transversa do úmero direito. No grupo I, a osteossíntese foi realizada associando-se dois pinos de Kirschner e polimetilmetacrilato, intramedulares; no grupo II, os pinos de Kirschner foram substituídos por pinos de Schanz; no grupo III, foram utilizados apenas dois pinos de Kirschner; e, no grupo IV, apenas dois pinos de Shanz. Os tempos médios para a consolidação óssea foram de 29±4,04 dias no grupo I; 24±5,29 dias no grupo II; 33±3,74 dias no grupo III; e 32,9±5,21 dias no grupo IV. Foi observada migração dos pinos em 42,9% dos animais do grupo I, em 0% nos do grupo II, em 85,7% nos do grupo III, e em 28,6% nos do grupo IV. Em duas aves dos grupos I, III e IV notou-se incapacidade de voar. Os resultados demonstram que a associação de dois pinos de Schanz e polimetilmetacrilato, ambos intramedulares, é um método efetivo para osteossíntese de úmero em pombos domésticos (Columba livia, proporcionando rápida consolidação óssea e mínimas complicações.Twenty-eight adult domestic pigeons (Columba livia were randomly divided into four groups of seven birds each. Anesthesia was performed with isoflurane and oxygen, and an osteotomy of the right humerus midshaft was performed with an electric cutter. On the sequence, one of the following treatments was chosen: group I, two Kirschner pins and polymethylmethacrylate intramedullary; group II, two Schanz pins and polymethylmethacrylate intramedullary; group III, two Kirschner pins only; and group IV, two Schanz pins only. The mean time ± standard deviation for fracture healing was 29±4.04 days in group I; 24±5.29 days in group II; 33±3.74 days in group III; 32.9±5.21 days in group IV. Pin migration was observed in 42.9% of the group I animals, 0% of group II, 85.7% of group III, and 28.6% of group IV. Two

  8. Sub-Compartment Variation in Tree Height, Stem Diameter and Stocking in a Pinus radiata D. Don Plantation Examined Using Airborne LiDAR Data

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    Hanieh Saremi

    2014-08-01

    Full Text Available Better information regarding the spatial variability of height, Diameter at Breast Height (DBH and stocking could improve inventory estimates at the operational Planning Unit since these parameters are used extensively in allometric equations, including stem volume, biomass and carbon calculations. In this study, the influence of stand stocking on height and DBH of two even aged radiata pine (Pinus radiata D. Don stands were investigated using airborne Light Detection and Ranging (LiDAR data at a study site in New South Wales, Australia. Both stands were characterized by irregular stocking due to patchy establishment and self-thinning in the absence of any silvicultural thinning events. For the purpose of this study, a total of 34 plots from a 34 year old site and 43 plots from a nine year old site were established, from which a total of 447 trees were sampled. Within these plots, DBH and height measurements were measured and their relationships with stocking were evaluated. LiDAR was used for height estimation as well as stem counts in fixed plots (stocking. The results showed a significant relationship between stem DBH and stocking. At both locations, trees with larger diameters were found on lower stocking sites. Height values were also significantly correlated with stocking, with taller trees associated with high stocking. These results were further verified of additional tree samples, with independent field surveys for DBH and LiDAR-derived metrics for height analysis. This study confirmed the relationship between P. radiata tree heights and stem diameter with stocking and demonstrated the capacity of LiDAR to capture sub-compartment variation in these tree-level attributes.

  9. Transcriptional Slippage and RNA Editing Increase the Diversity of Transcripts in Chloroplasts: Insight from Deep Sequencing of Vigna radiata Genome and Transcriptome.

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    Ching-Ping Lin

    Full Text Available We performed deep sequencing of the nuclear and organellar genomes of three mungbean genotypes: Vigna radiata ssp. sublobata TC1966, V. radiata var. radiata NM92 and the recombinant inbred line RIL59 derived from a cross between TC1966 and NM92. Moreover, we performed deep sequencing of the RIL59 transcriptome to investigate transcript variability. The mungbean chloroplast genome has a quadripartite structure including a pair of inverted repeats separated by two single copy regions. A total of 213 simple sequence repeats were identified in the chloroplast genomes of NM92 and RIL59; 78 single nucleotide variants and nine indels were discovered in comparing the chloroplast genomes of TC1966 and NM92. Analysis of the mungbean chloroplast transcriptome revealed mRNAs that were affected by transcriptional slippage and RNA editing. Transcriptional slippage frequency was positively correlated with the length of simple sequence repeats of the mungbean chloroplast genome (R2=0.9911. In total, 41 C-to-U editing sites were found in 23 chloroplast genes and in one intergenic spacer. No editing site that swapped U to C was found. A combination of bioinformatics and experimental methods revealed that the plastid-encoded RNA polymerase-transcribed genes psbF and ndhA are affected by transcriptional slippage in mungbean and in main lineages of land plants, including three dicots (Glycine max, Brassica rapa, and Nicotiana tabacum, two monocots (Oryza sativa and Zea mays, two gymnosperms (Pinus taeda and Ginkgo biloba and one moss (Physcomitrella patens. Transcript analysis of the rps2 gene showed that transcriptional slippage could affect transcripts at single sequence repeat regions with poly-A runs. It showed that transcriptional slippage together with incomplete RNA editing may cause sequence diversity of transcripts in chloroplasts of land plants.

  10. GESSO SINTÉTICO E PINOS TRANSCORTICAIS NA REDUÇÃO DE FRATURA DE TÍBIA EM UMA BEZERRA FIBERGLASS CAST AND TRANSCORTICAL PINS IN TIBIAL FRACTURE REDUCTION IN A CALF

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    Edivaldo Aparecido Nunes Martins

    2001-02-01

    Full Text Available Relata-se um caso de fratura de tíbia em uma bezerra de sete meses de idade, 200kg de peso, apresentando fratura fechada, cominutiva em diáfise. A fixação externa foi preferida como método de imobilização óssea, utilizando-se pinos transcorticais e gesso sintético. Obteve-se eficiente imobilização da fratura, com rápida recuperação do animal, dispendendo-se pouco tempo para o pós-operatório (52 dias. A técnica demonstrou ser de fácil realização e passível de ser executada a campo.A case of tibial fracture in a 7-month-old calf is reported, with closed comminuted diaphysial fracture. It has been given preference to external fixation as means of fracture immobilization, and transcortical pins and fiberglass cast have been used. Effective immobilization of the fracture and fast recovering of the animal as well as less time consuming toward the postoperative have been obtained. This technique has showed feasible to be done in the field.

  11. Estudio de factibilidad para la creación de una empresa productora de carbón activado a partir de residuos de pino Pátula

    OpenAIRE

    Mejía Jaramillo, Juanita; Rendón Cardona, Juliana

    2006-01-01

    Uno de los mayores problemas ambientales que enfrenta la humanidad en la actualidad es la recolección, reciclaje y disposición final de los residuos; cualquiera que sea su origen, ya sea la industria química, alimenticia, agroindustria, entre otras. Los residuos madereros son residuos que por su volumen, tamaño y disposición final, actualmente están generando problemas en las zonas donde se encuentra la industria maderera. En Antioquia, por ejemplo, en los municipios del oriente.

  12. Molecular and analysis of a phenylalanine ammonia-lyase gene (LrPAL2) from Lycoris radiata.

    Science.gov (United States)

    Jiang, Yumei; Xia, Bing; Liang, Lijian; Li, Xiaodan; Xu, Sheng; Peng, Feng; Wang, Ren

    2013-03-01

    Phenylalanine ammonia-lyase (PAL), the first enzyme of phenylpropanoid biosynthesis, participates in the biosynthesis of flavonoids, lignins, stilbenes and many other compounds. In this study, we cloned a 2,326 bp full-length PAL2 gene from Lycoris radiata by using degenerate oligonucleotide primer PCR (DOP-PCR) and the rapid amplification of cDNA ends method. The cDNA contains a 2,124 bp coding region encoding 707 amino acids. The LrPAL2 shares about 77.0 % nucleic acid identity and 83 % amino acid identity with LrPAL1. Furthermore, genome sequence analysis demonstrated that LrPAL2 gene contains one intron and two exons. The 5' flanking sequence of LrPAL2 was also cloned by self-formed adaptor PCR (SEFA-PCR), and a group of putative cis-acting elements such as TATA box, CAAT box, G box, TC-rich repeats, CGTCA motif and TCA-element were identified. The LrPAL2 was detected in all tissues examined, with high abundance in bulbs at leaf sprouting stage and in petals at blooming stage. Besides, LrPAL2 drastically responded to MJ, SNP and UV, moderately responded to GA and SA, and a little increased under wounding. Comparison of LrPAL2 expression and LrPAL1 expression demonstrated that LrPAL2 can be more significantly induced than LrPAL1 under the above treatments, and LrPAL2 transcripts accumulated prominently at blooming stage, especially in petals, while LrPAL1 transcripts did not accumulated significantly at blooming stage. All these results suggested that LrPAL2 might play distinct roles in different branches of the phenylpropanoid pathway.

  13. Formation and action of lignin-modifying enzymes in cultures of Phlebia radiata supplemented with veratric acid

    International Nuclear Information System (INIS)

    Lundell, T.; Hatakka, A.; Leonowicz, A.; Rogalski, J.

    1990-01-01

    Transformation of veratric (3,4-dimethoxybenzoic) acid by the white rot fungus Phlebia radiata was studied to elucidate the role of ligninolytic, reductive, and demeth(ox)ylating enzymes. Under both air and a 100% O 2 atmosphere, with nitrogen limitation and glucose as a carbon source, reducing activity resulted in the accumulation of veratryl alcohol in the medium. When the fungus was cultivated under air, veratric acid caused a rapid increase in laccase (benzenediol:oxygen oxidoreductase; EC 1.10.3.2) production, which indicated that veratic acid was first demethylated, thus providing phenolic compounds for laccase. After a rapid decline in laccase activity, elevated lignin peroxidase (ligninase) activity and manganese-dependent peroxidase production were detected simultaneously with extracellular release of methanol. This indicated apparent demethoxylation. When the fungus was cultivated under a continuous 100% O 2 flow and in the presence of veratric acid, laccase production was markedly repressed, whereas production of lignin peroxidase and degradation of veratryl compounds were clearly enhanced. In all cultures, the increases in lignin peroxidase titers were directly related to veratryl alcohol accumulation. Evolution of 14 CO 2 from 3-O 14 CH 3 -and 4-O 14 CH 3 -labeled veratric acids showed that the position of the methoxyl substituent in the aromatic ring only slightly affected demeth(ox)ylation activity. In both cases, more than 60% of the total 14 C was converted to 14 CO 2 under air in 4 weeks, and oxygen flux increased the degradation rate of the 14 C-labeled veratric acids just as it did with unlabeled cultures

  14. Characterization of a novel Y2K-type dehydrin VrDhn1 from Vigna radiata.

    Science.gov (United States)

    Lin, Chia-Hui; Peng, Po-Hsin; Ko, Chia-Yun; Markhart, Albert H; Lin, Tsai-Yun

    2012-05-01

    A novel dehydrin gene (VrDhn1) was isolated from an embryo cDNA library of Vigna radiata (L.) Wilczek (mungbean) variety VC1973A. The intronless VrDhn1 gene encodes a protein belonging to the Y(2)K-type dehydrin family. VrDhn1 protein accumulated in embryos and cotyledons during seed maturation and disappeared 2 days after seed imbibition (DAI). The expression of VrDhn1 mRNA and accumulation of VrDhn1 protein were at high levels in mature seeds, but neither mRNA nor protein was detected in mungbean vegetative tissues under normal growth conditions. The VrDhn1 mRNA level was extremely high in mature seeds and decreased to ∼30% at 1 DAI, and was not detectable at ~7 DAI. Tissue dehydration, salinity and exogenous ABA markedly induced VrDhn1 transcripts in plants as measured by quantitative real-time reverse transcription-PCR (qRT-PCR). VrDhn1 protein was not detected using immunoblots in seedlings under stress treatments. In mature seeds or 1 DAI seedlings, VrDhn1 proteins were immunolocalized in the nucleus and cytoplasm. VrDhn1 exhibited low affinity for non-specific interaction with DNA using electrophoretic mobility shift assays (EMSAs), and the exogenous addition of Zn(2+) or Ni(2+) stimulated interaction. The His-tagged VrDhn1 (30.17 kDa) protein showed a molecular mass of 63.1 kDa on gel filtration, suggesting a dimer form. This is the first report showing that a Y(2)K-type VrDhn1 enters the nucleus and interacts with DNA during seed maturation.

  15. Combined efficacy of Vigna radiata (L. R. Wilczek and Amorphophallus paeoniifolius (Dennst. Nicolson on serum lipids in albino rats

    Directory of Open Access Journals (Sweden)

    P.B. Benil

    2017-09-01

    Full Text Available Coronary Artery Disease (CAD is a major killer disease throughout the world. Dyslipidemia is a major contributor to the risk of CAD. Several dietary articles traditionally used in India and other South Asian countries reduced dyslipidemia. The present study was undertaken to evaluate the combined effect of Mung bean (Vigna radiata and Elephant foot yam (Amorphophallus paeoniifolius on serum lipids and atherogenic indices in albino rats and to compare it with a standard drug Cholestyramine. Thirty healthy albino rats of both sexes (150–200 g were randomized to 5 groups of 6 animals each. The grouping were done based on the following criteria: Group I: Normal Control Group, Group II: (Standard Group: Cholestyramine resin 5 mg/kg bw, Group III: (Half Dose Group: Drug powder at 540 mg/kg bw, Group IV: (Effective Dose Group: Drug powder at 1080 mg/kg bw, and Group V: (Double Dose Group: Drug powder at 2160 mg/kg bw. Lipid profile was estimated at the beginning and after 30 days of treatment. The Effective and Double doses of the drug reduced Total cholesterol along with levels of Triglycerides, Low density lipoprotein and Very low density lipoprotein levels significantly (p < 0.01 along with a significant (p < 0.01 increase in high density lipoproteins (HDL in rats. There was also significant (p < 0.01 improvement in atherogenic indices like Castelli Risk Index I, Non HDL C/HDL, Castelli risk Index II, TG/HDL, Atherogenic coefficient and Atherogenic Index of Plasma. The combination of powdered sprouted mung bean and yam powder have excellent lipid lowering potential.

  16. Peces del Noroeste del Ecuador

    OpenAIRE

    Barriga, Ramiro

    1994-01-01

    La ictiofauna del occidente del Ecuador es poco conocida. Los peces del noroccidente son diferentes a los del suroccidente del Ecuador. 34 familias y 82 especies fueron colectadas que equivale al 11 % de las especies de peces continentales registradas en el Ecuador. Icteogeográficamente se sabe que la costa ecuatoriana posee dos provincias: la del Pacifico Norte y la del Guayas, se determinó que el límite de las dos provincias es el río Santiago ya que las especies del mencionado río so...

  17. Retention of radicular posts varying the application technique of the adhesive system and luting agent Retenção de pinos radiculares variando-se a técnica de aplicação do sistema adesivo e do agente cimentante

    Directory of Open Access Journals (Sweden)

    Tabajara Sabbag Fonseca

    2006-12-01

    Full Text Available This study evaluated in vitro the retention of intracanal cast posts cemented with dual-cure resin varying the application method of the primer/adhesive solution and luting agent in the prosthetic space prepared to receive the posts. Sixty endodontically treated maxillary canines had their crowns discarded, and their roots were embedded in acrylic resin. The prosthetic spaces were prepared with Largo burs mounted on a low-speed handpiece coupled to a parallelometer in order to maintain length and diameter of intraradicular posts constant and to guarantee that the preparations were parallel after casting. Two groups (n = 30 were randomly formed according to the device used to apply the adhesive system: microbrush or standard bristle brush (control. Each group was divided into 3 subgroups (n = 10 according to the technique used to place the luting agent into the root canal: using only a lentulo spiral before setting the post, applying it onto the post surface, or combining both methods. After 72 hours, the tensile force required to dislodge each post was determined by a universal testing machine (Instron 4444 set at a speed of 1 mm/min. The results indicated that the use of the microbrush yielded higher bond strength values (0.1740 ± 0.04 kN than those recorded for the bristle brush tip (0.1369 ± 0.04 kN, p O objetivo deste trabalho foi avaliar in vitro a retenção de pinos intra-radiculares variando-se a técnica de aplicação do agente adesivo e do cimento resinoso dual no espaço protético preparado para a recepção do pino. Sessenta caninos superiores tratados endodonticamente tiveram as coroas descartadas e as raízes incluídas em resina acrílica. Os espaços protéticos foram preparados com broca de Largo acionada por micromotor acoplado a um paralelômetro, a fim de manter constantes o comprimento e diâmetro dos pinos intra-radiculares e o paralelismo dos preparos após a fundição. Os pinos foram divididos aleatoriamente em 2

  18. Avaliação da resistência mecânica de três diferentes pinos de Schanz às forças de torção em montagens do fixador externo monolateral Mechanical resistance evaluation of three different Schanz screws to torsion forces in monolateral external fixation assemblies

    Directory of Open Access Journals (Sweden)

    Marcelo Mercadante

    2005-01-01

    Full Text Available OBJETIVO: O objetivo deste estudo é avaliar a resistência mecânica de três montagens de fixador externo linear utilizando pinos de 4,5 mm e de 5,5 mm com alma 3,2mm, e de 5,5 mm com alma de 4,5 mm no setor rosqueado dos pinos. MATERIAL E MÉTODOS: Foram montados fixadores externos lineares em tubos de polipropileno de 500 mm, com um corte obliquo a 45º no seu centro, com dois pinos de Schanz em cada segmento. Foram estudados 18 corpos de prova, divididos em três grupos de seis peças cada. No grupo 1 foram utilizados pinos de Schanz de 4,5 mm, no grupo 2 pinos de 5,5 mm ambos com alma de 3,2 mm e no grupo 3 pinos de 5,5 mm com alma de 4,5 mm de diâmetro. Os testes mecânicos foram realizadas em máquina de torção MT-100, e as medidas de resistência realizadas com 4,5º, 9,0º, 13,5º e 18,0º de torção. RESULTADOS: Os pinos de Schanz de 4,5 mm e alma de 3,2 mm mostraram como média de resistência para as torções de 4,5º, 9,0º, 13,5º e 18,0º, respectivamente: 12,0 N/mm, 21,0 N/mm, 33,0 N/mm e 46,0 N/mm. Os pinos de 5,5 com alma de 3,2 mm mostraram como resistência média: 13,2 N/mm, 25,3 N/mm, 40,0 N/mm e 51,2 N/mm, respectivamente. Os testes com os pinos de Schanz de 5,5 mm com alma de 4,5 mm mostraram resistência média de: 15,2 N/mm, 33,5 N/mm, 53,0 N/mm e 70,0 N/mm. Estudo estatístico com o teste da Análise de Variância e o teste de Bonferroni mostraram ausência de diferença estatisticamente significante entre os grupos com pinos com diâmetro da alma da parte roscada de 3,2mm (de 4,5 mm e 5,5 mm. Houve diferença estatisticamente significante (alfa OBJECTIVE: The objective of this study was to evaluate the mechanical force of three different assemblies of a linear external fixator using 4.5 mm and 5.5 mm Schanz screws with a 3.2 mm-diameter root, and another screw with 5.5 mm diameter with a 4,5mm root. MATERIAL AND METHODS: The linear external fixator was assembled in a 500 mm-long polypropylene tube, with a 45

  19. ASERRÍN DE PINO COMO SUSTRATO HIDROPÓNICO. I: VARIACIÓN EN CARACTERÍSTICAS FÍSICAS DURANTE CINCO CICLOS DE CULTIVO

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    Joel Pineda-Pineda

    2012-01-01

    tratamiento de 100 % aserrín. Estos tratamientos se evaluaron durante cinco ciclos continuos de cultivo con jitomate (30 meses. Al sustrato original y al final de cada ciclo se midieron porosidad total, volumen de partículas, capacidad de retención de humedad, capacidad de aireación y densidad aparente. Se encontró poca variación en la densidad aparente, pero la porosidad, la retención de humedad y la capacidad de aireación disminuyeron gradualmente durante los cinco ciclos de cultivo con jitomate. La capacidad de aireación fue la característica física que presentó mayor variación, mostrando valores por debajo del adecuado después de 24 meses de cultivo.

  20. Changes in some biophysical and biochemical parameters of mungbean [vigna radiata (L.) wilczek] grown on chromium-contaminated soils treated with solid tea wastage

    International Nuclear Information System (INIS)

    Azmat, R.; Akhtar, H.

    2010-01-01

    The success of solid tea wastage treatment technology in remediating chromium (111) contamination in the soil has been demonstrated on growth of Vigna radiata. The present research was designed to study the effect of chromium (Cr3/sup +/) on plant growth, potassium (K), phosphorus (P), protease activity and proline profile of Vigna radiata as a bio indicator in the presence and absence of the solid tea surface as a bio sorbent to control the mobility of Cr3/sup +/ in the soil. Results showed toxic effects of Cr3/ sup +/ on plant growth and development, which include high protease activity with prominent proline and decreased potassium and phosphorus contents at elevated concentration of metal. Proline content is the only amino acid that accumulates to a greater extent in the leaves of plants under stress. An increase in proline contents in leaves, stem and root with high concentration of Cr3/s sup +/ gets reduced in a solid tea wastage amended plants. Metabolic alteration by Cr3/ sup +/exposure and their control by solid tea wastage already described in the first report, showed direct effect on enzymes or other metabolites or by its ability to generate reactive oxygen species which may cause oxidative stress. It is suggested that the plant can grow under chromium stress if some suitable adsorbent (like tea wastage) is mixed with the soil which can protect the plants from the phyto toxicity of Cr 3/sup +/ by altering various metabolic processes. (author)

  1. Gill tissue reactions in walleye Stizostedion vitreum vitreum and common carp Cyprinus carpio to glochidia of the freshwater mussel Lampsilis radiata siliquoidea

    Science.gov (United States)

    Waller, D.L.; Mitchell, L.G.

    1989-01-01

    The glochidia of many freshwater mussels, which are obligate parasites on the gills, fins, and other body parts of specific fishes, attach to a suitable host, become encapsulated, and develop to the free-living juvenile stage. Using light and electron microscopy we compared gill tissue reactions in a suitable host (walleye Stizostedion vitreum vitreum) and unsuitable host (common carp Cyprinus carpio) infected with Lampsilis radiata siliquoidea. Encapsulation of glochidia on walleye gills was completed by 6 h post-infection at 20 to 22°C. Capsular formation and compaction were accompanied by a general increase in epithelioid cells. Fibrotic material appeared in capsules at about 48 h and virtually filled capsular cells from about Day 5 to Day 11 post-infection. Liberation of juvenile mussels was accompanied by thinning of the capsule from about Day 11 to Day l7. Although glochidia attached to the gills of common carp, few became encapsulated. By 48 h post-infection, preliminary capsular growth was evident and necrotic cells and cellular debris appeared at the edges of the growth. However, all glochidia were sloughed from carp gills by 60 h. Host specificity of L. radiata siliquoidea apparently depended on a combination of the attachment response of glochidia, differences in the encapsulation process, and tissue reactions in the fish.

  2. The Combined Intervention with Germinated Vigna radiata and Aerobic Interval Training Protocol Is an Effective Strategy for the Treatment of Non-Alcoholic Fatty Liver Disease (NAFLD and Other Alterations Related to the Metabolic Syndrome in Zucker Rats

    Directory of Open Access Journals (Sweden)

    Garyfallia Kapravelou

    2017-07-01

    Full Text Available Metabolic syndrome (MetS is a group of related metabolic alterations that increase the risk of developing non-alcoholic fatty liver disease (NAFLD. Several lifestyle interventions based on dietary treatment with functional ingredients and physical activity are being studied as alternative or reinforcement treatments to the pharmacological ones actually in use. In the present experiment, the combined treatment with mung bean (Vigna radiata, a widely used legume with promising nutritional and health benefits that was included in the experimental diet as raw or 4 day-germinated seed flour, and aerobic interval training protocol (65–85% VO2 max has been tested in lean and obese Zucker rats following a 2 × 2 × 2 (2 phenotypes, 2 dietary interventions, 2 lifestyles factorial ANOVA (Analysis of Variance statistical analysis. Germination of V. radiata over a period of four days originated a significant protein hydrolysis leading to the appearance of low molecular weight peptides. The combination of 4 day-germinated V. radiata and aerobic interval training was more efficient compared to raw V. radiata at improving the aerobic capacity and physical performance, hepatic histology and functionality, and plasma lipid parameters as well as reverting the insulin resistance characteristic of the obese Zucker rat model. In conclusion, the joint intervention with legume sprouts and aerobic interval training protocol is an efficient treatment to improve the alterations of glucose and lipid metabolism as well as hepatic histology and functionality related to the development of NAFLD and the MetS.

  3. The Combined Intervention with Germinated Vigna radiata and Aerobic Interval Training Protocol Is an Effective Strategy for the Treatment of Non-Alcoholic Fatty Liver Disease (NAFLD) and Other Alterations Related to the Metabolic Syndrome in Zucker Rats.

    Science.gov (United States)

    Kapravelou, Garyfallia; Martínez, Rosario; Nebot, Elena; López-Jurado, María; Aranda, Pilar; Arrebola, Francisco; Cantarero, Samuel; Galisteo, Milagros; Porres, Jesus M

    2017-07-19

    Metabolic syndrome (MetS) is a group of related metabolic alterations that increase the risk of developing non-alcoholic fatty liver disease (NAFLD). Several lifestyle interventions based on dietary treatment with functional ingredients and physical activity are being studied as alternative or reinforcement treatments to the pharmacological ones actually in use. In the present experiment, the combined treatment with mung bean ( Vigna radiata ), a widely used legume with promising nutritional and health benefits that was included in the experimental diet as raw or 4 day-germinated seed flour, and aerobic interval training protocol (65-85% VO₂ max) has been tested in lean and obese Zucker rats following a 2 × 2 × 2 (2 phenotypes, 2 dietary interventions, 2 lifestyles) factorial ANOVA (Analysis of Variance) statistical analysis. Germination of V. radiata over a period of four days originated a significant protein hydrolysis leading to the appearance of low molecular weight peptides. The combination of 4 day-germinated V. radiata and aerobic interval training was more efficient compared to raw V. radiata at improving the aerobic capacity and physical performance, hepatic histology and functionality, and plasma lipid parameters as well as reverting the insulin resistance characteristic of the obese Zucker rat model. In conclusion, the joint intervention with legume sprouts and aerobic interval training protocol is an efficient treatment to improve the alterations of glucose and lipid metabolism as well as hepatic histology and functionality related to the development of NAFLD and the MetS.

  4. Desenvolvimento dos Parâmetros do Processo de Soldagem por Atrito com Pino Não Consumível para o Aço de Alta Resistência e Baixa Liga ISO 3183 X80M

    Directory of Open Access Journals (Sweden)

    Tahiana F. C. Hermenegildo

    Full Text Available Resumo Sabe-se que as velocidades de soldagem e rotacional, força axial, ângulo de inclinação e desenho da ferramenta são as principais variáveis de entrada independentes, que são utilizadas para controlar o processo de soldagem por atrito com pino não consumível, e que a taxa de geração de calor, taxa de resfriamento, força na direção de soldagem e o torque são as variáveis de resposta, que irão influenciar na evolução microestrutural e desempenho mecânico da junta soldada. Neste trabalho foi feito um estudo do comportamento destas variáveis visando o desenvolvimento de parâmetros para o aço API 5L X80 (ISO 3183 X80M. Para tanto, chapas com 12 mm de espessura, foram soldadas através de dois passes, utilizando ferramenta de nitreto de boro cúbico policristalino. Observou-se que, mantendo-se a velocidade de soldagem constante, o aumento da velocidade rotacional e /ou da força axial, tende a reduzir as forças reativas e o torque atuantes durante o processo pelo aumento da taxa de geração de calor. Por outro lado, mantendo-se essas variáveis constantes, o aumento da velocidade de soldagem tende a aumentar as forças e o torque, uma vez que para o aço, este parâmeto desempenha um papel significativo na taxa de geração de calor durante o processo.

  5. Tensile bond strength of glass fiber posts luted with different cements Resistência à tração de pinos de fibra de vidro cimentados com diferentes materiais

    Directory of Open Access Journals (Sweden)

    Gerson Bonfante

    2007-06-01

    Full Text Available Proper selection of the luting agent is fundamental to avoid failure due to lack of retention in post-retained crowns. The objective of this study was to investigate the tensile bond strength and failure mode of glass fiber posts luted with different cements. Glass fiber posts were luted in 40 mandibular premolars, divided into 4 groups (n = 10: Group 1 - resin-modified glass ionomer RelyX Luting; Group 2 - resin-modified glass ionomer Fuji Plus; Group 3 - resin cement RelyX ARC; Group 4 - resin cement Enforce. Specimens were assessed by tensile strength testing and light microscopy analysis for observation of failure mode. The tensile bond strength values of each group were compared by ANOVA and Tukey test. The significance level was set at 5%. The failure modes were described as percentages. The following tensile strength values were obtained: Group 1 - 247.6 N; Group 2 - 256.7 N; Group 3 - 502.1 N; Group 4 - 477.3 N. There was no statistically significant difference between Groups 1 and 2 or between Groups 3 and 4, yet the resin cements presented significantly higher tensile bond strength values than those presented by the glass ionomer cements. Group 1 displayed 70% of cohesive failures, whereas Groups 2, 3 and 4 exhibited 70% to 80% of adhesive failures at the dentin-cement interface. We concluded that resin cements and glass ionomer cements are able to provide clinically sufficient retention of glass fiber posts, and that glass ionomer cements may be especially indicated when the application of adhesive techniques is difficult.A seleção adequada do agente cimentante é essencial para evitar falhas por perda de retenção em coroas retidas por núcleos. O objetivo deste estudo foi investigar a resistência à tração e o tipo de falha de pinos de fibra de vidro cimentados com diferentes materiais. Cimentaram-se pinos de fibra de vidro em 40 pré-molares inferiores, divididos em 4 grupos (n = 10: Grupo 1 - ionômero de vidro modificado

  6. Los paisajes actuales y del pasado de un espacio de montaña volcánica: la Reserva Natural Especial del Chinyero (Tenerife, Islas Canarias

    Directory of Open Access Journals (Sweden)

    Esther Beltán Yanes

    2017-01-01

    Full Text Available La Reserva Natural Especial del Chinyero se localiza al noroeste de Tenerife a una altitud entre 600 y 1.550 msnm. Este espacio protegido ofrece hoy un excepcional paisaje natural integrado por volcanes recientes e históricos de morfología estromboliana, colonizados por bosques de pino canario. Sin embargo, en la reserva se descubren huellas de otros paisajes del pasado que respondían a una original convivencia de la población con los volcanes y bosques de este sector. Este trabajo tiene por objetivo el estudio del paisaje de este paraje natural con el fin de identificar y caracterizar los rasgos de su fisonomía actual, pero también recuperar otros paisajes olvidados de estas montañas. Hoy las prioridades en su protección y gestión sólo se fundamentan en sus valores naturales La restauración de estas antiguas fisonomías desvelará el importante contenido cultural que además poseen estos paisajes, pues constituían el mejor reflejo de lo que era un apro- vechamiento racional de los escasos recursos naturales. Este trabajo se centra en el estudio del paisaje a través del análisis de la relación espacial de sus componentes y la importancia relativa de éstos en la configuración de una imagen exclusiva de la montaña canaria, prestando especial énfasis en su evolución.

  7. Caracterización de sitios de percha del guajolote silvestre (Meleagris gallopavo mexicana en Sierra Fría, Aguascalientes, México Roost sites characteristics of wild turkey (Meleagris gallopavo mexicana in Sierra Fria, Aguascalientes, Mexico

    Directory of Open Access Journals (Sweden)

    Marcelo Márquez-Olivas

    2007-06-01

    Full Text Available Entre octubre y noviembre del año 2001 y mayo de 2002 se localizaron 16 sitios de percha de guajolote silvestre (Meleagris gallopavo mexicana en la Sierra Fría de Aguascalientes. El 87.5% de los sitios se encontraron en bosques de pino-encino (en rodales de pinos, en altitudes de 2500 a 2650 m. En la parte alta (2/3 de la cuesta se localizaron 8 de los sitios y 7 sobre laderas de exposición noreste, en una pendiente promedio de 38.9 ± 12.6%. El 62.5% de los sitios se usaron durante todo el periodo de estudio y el resto, de manera ocasional. La mayoría de los dormideros se encontraron cerca de comederos o cebaderos y de parcelas agrícolas. Se contabilizaron de 1 a 23 árboles de percha utilizados por sitio, distribuidos a una distancia promedio de 24.4 ± 17.8 metros. El 81.2% de los árboles (n=170 fueron pinos (Pinus teocote, P. durangensis, P. leiophylla y P. michoacana, 17.6% encinos (Quercus laurina, Q. grisea y Q. eduardii y 1.2% madroños (Arbutus arizonica. La altura promedio de los árboles fue de 16.6 ± 4.4 m y el diámetro 43.2 ± 11.5 cm. La preferencia del guajolote silvestre por utilizar pinos como dormideros en lugar de otras especies arbóreas, se debe posiblemente a que son árboles de mayor porte o a la conformación de su dosel; sin embargo, se ha observado que en lugares donde hay pocos pinos, los guajolotes utilizan para dormir otros árboles de características semejantes, como encinos, madroños o sicomoros.Sixteen roosting sites of Gould's wild turkey (Meleagris gallopavo mexicana were found between October and November of 2001 and May of 2002 in Sierra Fría, Aguascalientes. A large percentage (87.5% of the roost sites was located in oak-pine forest (in pine stands, at an elevation range of 2500 to 2650 meters. Eight roost sites were on the upper portion (2/3 of the ridge, and 7 at northeast exposures with an average slope of 38.9 ± 12.6%. Most (81.2% of the roost trees (n =170 were pines (Pinus teocote, P

  8. Effect of soaking and fermentation on content of phenolic compounds of soybean (Glycine max cv. Merit) and mung beans (Vigna radiata [L] Wilczek).

    Science.gov (United States)

    María Landete, José; Hernández, Teresa; Robredo, Sergio; Dueñas, Montserrat; de Las Rivas, Blanca; Estrella, Isabel; Muñoz, Rosario

    2015-03-01

    Mung beans (Vigna radiata [L] Wilczek) purchased from a Spanish company as "green soybeans", showed a different phenolic composition than yellow soybeans (Glycine max cv. Merit). Isoflavones were predominant in yellow soybeans, whereas they were completely absent in the green seeds on which flavanones were predominant. In order to enhance their health benefits, both types of bean were subjected to technological processes, such as soaking and fermentation. Soaking increased malonyl glucoside isoflavone extraction in yellow beans and produced an increase in apigenin derivatives in the green beans. Lactobacillus plantarum CECT 748 T fermentation produced an increase in the bioactivity of both beans since a conversion of glycosylated isoflavones into bioactive aglycones and an increase of the bioactive vitexin was observed in yellow and green beans, respectively. In spite of potential consumer confusion, since soybean and "green soybean" are different legumes, the health benefits of both beans were enhanced by lactic fermentation.

  9. Nitrogen fixation by mung bean (Vigna radiata L.) under field conditions in the Philippines as quantified by 15N isotope dilution

    International Nuclear Information System (INIS)

    Rosales, C.M.; Rivera, F.; Hautia, R.A.; Del Rosario, E.

    1995-05-01

    Nitrogen fixation by five mung bean genotypes (Vigna radiata L.) was estimated using two reference crops at two locations in the Philippines. The percentage of N derived from fixation and the amount of N-fixed ranged from 64 to 87% and 43 to 85 kg N/ha respectively at one location and from 36.6 to 72% and 21 to 85 kg N/ha at another location using cotton as reference crop. Maize was not a good reference crop. The highest mung bean seed yields obtained were 1.99 t/ha and 0.86 t/ha in the two locations. As to residual benefits, corn dry matter seeds yield were higher when grown following N 2 -fixing mung bean than after non-fixing corn or cotton. (author). 25 refs., 1 fig., 5 tabs

  10. Isolation and screening of rhizobia for auxin biosynthesis and growth promotion of mung bean (Vigna radiata L. seedlings under axenic conditions

    Directory of Open Access Journals (Sweden)

    Muhammad Ashfaq Anjum, Zahir Ahmad Zahir, Muhammad Arshad and Muhammad Ashraf

    2011-04-01

    Full Text Available A series of screening experiments to evaluate the effectiveness of rhizobia for producing auxins and improvegrowth and nodulation of mungbean (Vigna radiata L. were carried out under axenic conditions. Forty fouriolatess of rhizobia were isolated using standard procedures. Auxin biosynthesis by these rhizobial isolates wasdetermined in the absence and presence of L-Trp, a physiological precursor of auxins. Rhizobial isolates variedwidely in auxins biosynthesis capabilities. On the basis of auxins biosynthesis, a pouch experiment was conductedfor screening thirty four efficient isolates of rhizobia for the growth promotion of mung bean. Results of pouch studyshowed that inoculation with selected rhizobial isolates increased the root /shoot length, fresh, and dry shoot weightof mung bean up to 33, 59, 71, 148, 107 and 188%, respectively, over untreated control. Further studies are neededunder glasshouse and field conditions for confirmation of these results.

  11. Seasonal Terpene Variation in Needles of Pinus radiata (Pinales: Pinaceae) Trees Attacked by Tomicus piniperda (Coleoptera: Scolytinae) and the Effect of Limonene on Beetle Aggregation.

    Science.gov (United States)

    Romón, Pedro; Aparicio, Domitila; Palacios, Francisco; Iturrondobeitia, Juan Carlos; Hance, Thierry; Goldarazena, Arturo

    2017-09-01

    Concentrations of four monoterpenes were determined in needles of Pinus radiata (D.Don) (Pinales: Pinaceae) trees that were attacked or nonattacked by Tomicus piniperda (L.) (Coleoptera: Scolytinae). Compounds were identified and quantified by gas chromatography-mass spectrometry. The mean ambient temperature was obtained using climate-recording data loggers. The effect of limonene on field aggregation was also evaluated at three limonene release rates using Lindgren attractant-baited traps and trap logs. Attacked trees produced less α-pinene in March, July, and November than nonattacked trees, less β-pinene in July and November, and less limonene from May to November. Limonene reduced the attraction of T. piniperda to attractant-baited traps and trap logs. Results were linked to better responses to high temperatures, with respect to terpene contents, by the nonattacked trees after the spring attack. © The Author 2017. Published by Oxford University Press on behalf of Entomological Society of America.

  12. Evaluation of ischemic damage of the corticospinal tract by diffusion tensor MRI. Utility in predicting functional outcome of corona radiata infarcts

    International Nuclear Information System (INIS)

    Tanaka, Hideki; Matsuno, Akira; Okubo, Toshiyuki; Nakaguchi, Hiroshi; Murakami, Mineko; Ono, Seiichi; Takeuchi, Masato

    2011-01-01

    Motor impairment is one of the most frequent symptoms among stroke patients and often leads to post-stroke dependency, so evaluation of motor symptoms and underlining corticospinal tract (CST) damage is of prime importance. Motor impairment, ischemic lesion by diffusion weighted MRI, and clinical outcome were assessed in 15 acute to early subacute corona radiata infarct patients. Motor impairment was graded severe: limb movement synergy level, moderate: selective muscle activity possible and mild: isolated movements are well coordinated. Outcome at the time of discharge was assessed by modified Rankin Scale (mRS). Diffusion tensor MRI (GE Signa Excite system 1.5 T, Echo Planar Imaging, MPG 15) was conducted at 2.3±2.2 days from the onset of the clinical symptoms. CST was delineated 3-dimensionally with dTV.II.SR and Volume-one 1.72. CST-FA (fractional anisotropy) ratio and CST-Area % were calculated at the slice where CST-infarct overlap was maximal. CST-FA ratio and CST-Area % showed good correlation to motor impairment at presentation. Patients with severe motor impairment had lower CST-FA ratio and CSF-Area % than those with moderate or mild. CST-FA ratio was 0.73±0.22 in patients with poor clinical outcome (mRS 3-6) and 0.93±0.09 with good clinical outcome (mRS 0-2) (p=0.038). Diffusion tensor MRI is useful in evaluating ischemic CST damage and predicting functional outcome in patients with corona radiata infarcts in the acute to subacute stage. (author)

  13. The potential of L. scoparium, K. robusta and P. radiata to mitigate N-losses in silvopastural systems.

    Science.gov (United States)

    Esperschuetz, J; Balaine, N; Clough, T; Bulman, S; Dickinson, N M; Horswell, J; Robinson, B H

    2017-06-01

    Silvopastoral systems aim to enhance economic, cultural and social principles by sustainably combining forest management with agriculture. In these typically high-nitrogen (N) environments, plant species selection can profoundly influence N fluxes. For grazed pastures, plants may be exposed to urine patches that have received the equivalent of up to 1000 kg N ha -1 . We aimed to determine the growth and N fluxes in three potential trees that may be used in silvopastoral systems: L. scoparium, K. robusta and P. radiata. Plants were grown in a greenhouse lysimeter experiment, with controlled irrigation and temperature and exposed to N at rates of 200 kg ha -1 equiv. for 15 weeks, followed by the addition of 800 kg ha -1 N equiv, to simulate a urine patch. Urea produced a positive growth response of all plant species. Treatments containing L. scoparium and K. robusta leached lower amounts of nitrate (NO 3 - ) (2 kg ha -1 NO 3 - ) compared to P. radiata (53 kg ha -1 ). Measurements of N 2 O over 20 days after the application of 800 kg N ha -1 indicated an inhibitory effect of L. scoparium and K. robusta on denitrification, hence loss of N via N 2 O. Both L. scoparium and K. robusta demonstrated that they have potential to reduce N-losses in silvopastural systems, while producing valuable biomass. Copyright © 2017 Elsevier Ltd. All rights reserved.

  14. No impact of transgenic nptII-leafy Pinus radiata (Pinales: Pinaceae) on Pseudocoremia suavis (Lepidoptera: Geometridae) or its endoparasitoid Meteorus pulchricornis (Hymenoptera: Braconidae).

    Science.gov (United States)

    Burgess, E P J; Barraclough, E I; Kean, A M; Walter, C; Malone, L A

    2011-10-01

    To investigate the biosafety to insects of transgenic Pinus radiata D. Don containing the antibiotic resistance marker gene nptII and the reproductive control gene leafy, bioassays were conducted with an endemic lepidopteran pest of New Zealand plantation pine forests and a hymenopteran endoparasitoid. Larvae of the common forest looper, Pseudocoremia suavis (Butler), were fed from hatching on P. radiata needles from either one of two nptII-leafy transgenic clones, or an isogenic unmodified control line. For both unparasitized P. suavis and those parasitized by Meteorus pulchricornis (Wesmael), consuming transgenic versus control pine had no impact on larval growth rate or mass at any age, larval duration, survival, pupation or successful emergence as an adult. Total larval duration was 1 d (3%) longer in larvae fed nptII-2 than nptII-1, but this difference was considered trivial and neither differed from the control. In unparasitized P. suavis larvae, pine type consumed did not affect rate of pupation or adult emergence, pupal mass, or pupal duration. Pine type had no effect on the duration or survival of M. pulchricornis larval or pupal stages, mass of cocoons, stage at which they died, adult emergence, or fecundity. Parasitism by M. pulchricornis reduced P. suavis larval growth rate, increased the duration of the third larval stadium, and resulted in the death of all host larvae before pupation. The lack of impact of an exclusive diet of nptII-leafy transgenic pines on the life history of P. suavis and M. pulchricornis suggests that transgenic plantation pines expressing nptII are unlikely to affect insect populations in the field.

  15. Cambio de uso del suelo y vegetación en el Parque Nacional Nevado de Toluca, México, en el periodo 1972-2000

    Directory of Open Access Journals (Sweden)

    Sergio Franco Maass

    2012-02-01

    Full Text Available Para conocer el estado de conservación del Parque Nacional Nevado de Toluca (PNNT, se analizaron los cambios en el uso del suelo y vegetación ocurridos entre 1972 y el 2000. Para ello fue preciso obtener cartografía digital mediante procesos de digitalización y fotointerpretación. Los mapas obtenidos se basaron en el sistema de clasificación del INEGI, serie 1. La aplicación de un sistema de información geográfica (SIG permitió obtener la densidad de la cobertura forestal y analizar el cambio de uso de suelo y vegetación, identificando los procesos de disminución y/o incremento en la densidad de las zonas forestales. En el periodo estudiado, poco más de 9 700 ha de bosques de pino, latifoliadas u oyamel, sufrieron pérdidas de densidad, esto representó 20% de la superficie del área natural protegida. Las zonas boscosas que mostraron incrementos apenas alcanzaron 4 800 ha. El enfoque metodológico adoptado resultó especialmente válido para obtener información detallada y con un alto nivel de precisión. Dicha información constituye un punto de partida para estudios a profundidad del parque nacional.

  16. (Vigna radiata) seeds

    African Journals Online (AJOL)

    hp

    and maximum activity was observed at 70°C. The optimal pH value of the enzyme activity was found to be 5.2. There was a ... expresses its isozymes in many plants such as soyabean .... Firstly, it can change the ionization of the enzyme.

  17. (Vigna radiata (L.) Wilczek)

    Indian Academy of Sciences (India)

    hectare with 1.02 million tonne production (average during. 2000–2003). This crop provides ... rinsed with 70% ethanol for 10–15 min and dried at room temperature overnight. .... gating generation led to differentiation. Cluster IV exhibited.

  18. Aplicación de imágenes de satélite en la cartografía de uso de suelo y vegetación en una región del Oriente del Valle de México

    Directory of Open Access Journals (Sweden)

    E. Buendía Rodríguez

    2002-01-01

    Full Text Available En México la aplicación de sensores remotos se encuentra en la fase de experimentación, por lo cual se están generando metodologías propias para el estudio del territorio mexicano. Para la clasificación de uso de suelo y vegetación, se realizó un estudio en la cuenca oriental del Valle de México, utilizando imágenes Landsat TM y Spot XS; procesadas mediante el Sistema Personal Interactivo de Percepción Remota versión 2.0 (SPIPR II, para diez unidades de clasificación que fueron: agricultura de riego (AR, agricultura de temporal (AT, pastizal halófilo (PH, bosque de pino (BP, pastizal inducido (PI, zona urbana (ZU, cuerpos de agua (CA, bosque de pino-pastizal (BP-PI, bosque de encino-matorral (BE-MI y bosque de abies (BA. Para el cumplimiento de los objetivos de dicho trabajo se establecieron cuatro tratamientos (componentes principales, análisis de texturas, convolución y filtrado sobre tres combinaciones de bandas (Landsat TM3-TM4-TM5, TM2-TM5-TM7 y Spot XS1-XS2-XS3. La mejor precisión fue para las imágenes clasificadas Landsat TM2-TM5-TM7 sin tratamiento con un 75 %, para Landsat TM3-TM4-TM5 sin tratamiento, fue de 69.07 % y las imágenes clasificadas Spot XS1-XS2-XS3 con el tratamiento de componentes principales tuvieron un 69.07 %.

  19. Flight Dynamics and Abundance of Ips sexdentatus (Coleoptera: Curculionidae: Scolytinae in Different Sawmills from Northern Spain: Differences between Local Pinus radiata (Pinales: Pinaceae and Southern France Incoming P. pinaster Timber

    Directory of Open Access Journals (Sweden)

    Sergio López

    2012-01-01

    Full Text Available In January 2009, the windstorm “Klaus” struck the southern part of France, affecting 37.9 million m3 of maritime pine Pinus pinaster Aiton (Pinales: Pinaceae. This breeding plant material favored the outbreak of Ips sexdentatus (Börner (Coleoptera: Curculionidae: Scolytinae. As much of this timber is imported to the Basque Country (northern Spain, a potential risk to conifer stands is generated, due to the emergence of the incoming beetles. Thus, flight dynamics and beetle abundance were compared in different sawmills, according to the timber species (either local P. radiata D. Don or imported P. pinaster. A maximum flight peak of I. sexdentatus was observed in mid-June in P. pinaster importing sawmills, whereas a second lighter peak occurred in September. In contrast, only a maximum peak in mid-June was observed in P. radiata inhabiting beetles, being significantly smaller than in local P. pinaster trading sawmills. In addition, significant differences were found between imported P. pinaster and P. radiata regarding the number of insects beneath the bark. The development of IPM strategies for controlling I. sexdentatus populations is recommended, due to the insect abundance found in P. pinaster imported timber.

  20. Antidiabetic, antioxidant and anti inflammatory properties of water and n-butanol soluble extracts from Saharian Anvillea radiata in high-fat-diet fed mice.

    Science.gov (United States)

    Kandouli, Chouaib; Cassien, Mathieu; Mercier, Anne; Delehedde, Caroline; Ricquebourg, Emilie; Stocker, Pierre; Mekaouche, Mourad; Leulmi, Zineb; Mechakra, Aicha; Thétiot-Laurent, Sophie; Culcasi, Marcel; Pietri, Sylvia

    2017-07-31

    According to Saharian traditional medicine, Anvillea radiata Coss. & Dur. (Asteraceae) has been valued for treating a variety of ailments such as gastro-intestinal, liver and pulmonary diseases, and has gained awareness for its beneficial effect on postprandial hyperglycemia. However, to best of our knowledge, no detailed study of the antidiabetic curative effects of this plant has been conducted yet. To determine the hypoglycemic and antidiabetic effect of dietary supplementation with Anvillea radiata extracts on high-fat-diet (HFD)-induced obesity and insulin resistance in C57BL/6J mice in relation with antioxidant, anti-inflammatory, pancreatic beta-cells and skeletal muscle protection, and digestive enzyme inhibiting properties. Six extracts (water soluble and organic) from aerial parts of the plant were analyzed phytochemically (total phenolic and flavonoid content) and screened for in vitro superoxide (by chemiluminescence) and hydroxyl radical (by electron paramagnetic resonance spin-trapping) scavenging, antioxidant (DPPH, TRAP and ORAC assays), xanthine oxidase, metal chelating, α-amylase and α-glucosidase inhibitory property, and protective effects on copper-induced lipoprotein oxidation. Then selected hydroalcoholic and aqueous extracts were assessed for toxicity in normal human lung fibroblasts and A549 cancer cells using FMCA and MTT assays. Two water-soluble extracts having the best overall properties were assessed for their (i) protective effect at 1-15µg/mL on metabolic activity of rat insulinoma-derived INS-1 cells exposed to hyperglycemic medium, and (ii) acute hypoglycemic effect on 16-weeks HFD-induced diabetic mice. Then diabetic mice were administered HFD supplemented by extracts (up to 150mg/kg/day) for 12 additional weeks using standard diet as control and the antidiabetic drug, metformin (150mg/kg), as positive control. Then the antidiabetic, anti-inflammatory and antioxidant activity of extracts were determined. Of the highly efficient

  1. Potencial del Agua del suelo

    Directory of Open Access Journals (Sweden)

    Bustamante Heliodoro

    1986-12-01

    Full Text Available La energía potencial del agua presenta diferencias de un punto del suelo a otro; esas diferencias son las que originan el movimiento del agua de acuerdo a la tendencia universal de la materia en el sentido de moverse de donde la energía potencial es mayor a donde dicha energía es menor. En el suelo el agua en consecuencia se mueve hacia donde su energía decrece hasta lograr su estado de equilibrio. Se desprende entonces que la cantidad de energía potencial absoluta contenida en el agua, no es importante por sí misma, sino por su relación con la energía en diferentes lugares dentro del suelo. El concepto Potencial de agua del suelo es un criterio para esta energía.

  2. Extração e caracterização de hemiceluloses de Pinus radiata e sua viabilidade para a produção de bioetanol

    Directory of Open Access Journals (Sweden)

    Pablo Reyes

    2013-02-01

    Full Text Available As galactoglucomananas são as principais frações de hemiceluloses presentes nas madeiras moles e contêm, principalmente, as hexoses galactose, glicose e manose. O isolamento eficiente e seletivo dessas hemiceluloses é um obstáculo crítico a superar para sua utilização. Os objetivos deste trabalho foram extrair e caracterizar soluções aquosas ácidas e neutras de hemiceluloses de cavacos de madeira de Pinus radiata, bem como avaliar sua viabilidade para a produção de bioetanol. As hemiceluloses em P. radiata representam 26 g/100 g de madeira (base seca, e as hexoses são responsáveis por aproximadamente 64% dessa quantidade. De acordo com as diferentes condições de extração, cerca de 50% da fração hemicelulósica foi solubilizada e recuperada depois de uma precipitação com etanol. As frações recuperadas de hemiceluloses estavam na forma de oligômeros com peso molecular médio (Mw variando entre 4x10³ e 4x10(5 g/mol. Os oligômeros hemicelulósicos foram hidrolisados com ácido sulfúrico diluído e os hidrolisados concentrados até aproximadamente 70 g/L hexosas e fermentados pela levedura Saccharomyces cerevisiae. Os resultados de fermentação indicaram que os açúcares obtidos dos extratos ácidos e neutros foram fermentados com rendimentos máximos de etanol de 63% e 54% (22 g/L e 19 g/L, respectivamente. A conversão de hemiceluloses da madeira em etanol é viável, porém seu baixo rendimento faz que o processo não seja economicamente atrativo, razão por que melhorias no processo ou usos alternativos das hemiceluloses devem ser avaliados.

  3. The effects of canopy cover on throughfall and soil chemistry in two forest sites in the Mexico City air basin; Los efectos de la cobertura de dosel en disminucion y la quimica del suelo en dos lugares de bosque en la cuenca de aire de la Ciudad de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Perez-Suarez, M. [Instituto Potosino de Investigacion Cientifica y Tecnologica (IPICYT), San Luis Potosi, S.L.P. (Mexico)]. E-mail: marlin@ipicyt.edu.mx; Fenn, M.E. [United States Department of Agriculture Forest Service Pacific Southwest Research Station, Forest Fire Laboratory, Riverside, California (United States); Cetina-Alcala, V.M.; Aldrete, A. [Instituto de Recursos Naturales, Colegio de Postgraduados, Montecillo, Edo. de Mexico (Mexico)

    2008-01-15

    Throughfall and soil chemistry were compared in two sites with differing atmospheric deposition: Desierto de los Leones National Park (high atmospheric deposition) and Zoquiapan National Park (low atmospheric deposition). Throughfall fluxes of NO{sub 3}-, SO{sub 4}{sup 2}-, Ca, Mg and K were compared under two canopy cover types: Abies religiosa Schl. (fir) and Pinus hartwegii Lindl. (pine), in comparison with sites without cover canopy, e.g. forests clearings. Throughfall fluxes decreased in the following order: fir > pine > forest clearing. Nitrogen balance under canopy of fir and pine resulted in negative values for net throughfall of NH{sub 4}+ at Desierto de los Leones and Zoquiapan, while NO{sub 3}-, only resulted in negative values under canopy cover at the low deposition site. With few exceptions, concentrations of total C, N and S, soluble SO{sub 4}{sup 2}-, and Ca{sub 2}+ were higher in soil under fir canopies than under pine or in forest clearings. In polluted sites, the densely foliated fir canopies generally resulted in higher throughfall fluxes and soil accumulation of N, S and Mg compared to pine canopies or open areas. The elevated atmospheric depositions affect the functional process of forest ecosystem, particularly the throughfall and nutrients intern cycle, and these effects depend of the cover and present tree species. [Spanish] El escurrimiento foliar y la quimica del suelo fueron comparados en dos sitios con diferente deposito atmosferico: el Parque Nacional Desierto de los Leones (alto deposito atmosferico) y el Parque Nacional Zoquiapan (bajo deposito atmosferico). Se compararon los flujos de NO{sub 3}-, SO{sub 4}{sup 2}-, Ca, Mg y K en el escurrimiento foliar bajo el dosel de dos especies de arboles: Abies religiosa Schl. (oyamel) y Pinus hartwegii Lindl. (pino), en comparacion con sitios sin cobertura, es decir en claros del bosque. Los flujos disminuyeron en el siguiente orden: oyamel >pino >claros. El consumo de N del dosel resulto en

  4. Extração e caracterização de hemiceluloses de Pinus radiata e sua viabilidade para a produção de bioetanol Extraction and characterization of hemicelluloses from Pinus radiata and its feasibility for bioethanol production

    Directory of Open Access Journals (Sweden)

    Pablo Reyes

    2013-02-01

    Full Text Available As galactoglucomananas são as principais frações de hemiceluloses presentes nas madeiras moles e contêm, principalmente, as hexoses galactose, glicose e manose. O isolamento eficiente e seletivo dessas hemiceluloses é um obstáculo crítico a superar para sua utilização. Os objetivos deste trabalho foram extrair e caracterizar soluções aquosas ácidas e neutras de hemiceluloses de cavacos de madeira de Pinus radiata, bem como avaliar sua viabilidade para a produção de bioetanol. As hemiceluloses em P. radiata representam 26 g/100 g de madeira (base seca, e as hexoses são responsáveis por aproximadamente 64% dessa quantidade. De acordo com as diferentes condições de extração, cerca de 50% da fração hemicelulósica foi solubilizada e recuperada depois de uma precipitação com etanol. As frações recuperadas de hemiceluloses estavam na forma de oligômeros com peso molecular médio (Mw variando entre 4x10³ e 4x10(5 g/mol. Os oligômeros hemicelulósicos foram hidrolisados com ácido sulfúrico diluído e os hidrolisados concentrados até aproximadamente 70 g/L hexosas e fermentados pela levedura Saccharomyces cerevisiae. Os resultados de fermentação indicaram que os açúcares obtidos dos extratos ácidos e neutros foram fermentados com rendimentos máximos de etanol de 63% e 54% (22 g/L e 19 g/L, respectivamente. A conversão de hemiceluloses da madeira em etanol é viável, porém seu baixo rendimento faz que o processo não seja economicamente atrativo, razão por que melhorias no processo ou usos alternativos das hemiceluloses devem ser avaliados.Galactoglucomannans are the major hemicellulosic fraction present in softwoods, and is mainly composed by the hexoses: galactose, glucose and mannose. The efficient and selective isolation of these hemicelluloses is regarded as one of the most critical obstacles to overcome for their utilization. The objective of the current work was to extract and characterize acidic and

  5. Pino ósseo homólogo conservado em glicerina a 98% e hemicerclagem com fio poliglactina 910 na osteossíntese umeral de pombos domésticos Homologous bone pin conserved in glycerin at 98% and hemicerclagem with a thread of poliglactina 910 in humerus osteosyntesis of domestic pigeons

    Directory of Open Access Journals (Sweden)

    Juliano Bolson

    2008-10-01

    Full Text Available O objetivo do presente estudo foi avaliar a utilização de um pino intramedular ósseo homólogo, conservado em glicerina a 98%, associado à hemicerclagem com fio poliglactina 910 na osteossíntese umeral transversa de pombos domésticos (Columba livia. Utilizou-se como pino ósseo a parte distal do tibiotarso, conservado com medula óssea. Foram operados 20 pombos domésticos, adultos, não-sexados e clinicamente sadios. Esses animais foram separados ao acaso em cinco grupos, com quatro indivíduos. O úmero foi seccionado cirurgicamente na sua diáfise, de forma transversa, e o pino ósseo foi devidamente implantado no seio do osso. Orifícios foram realizados e por eles procedeu-se hemicerclagem do tipo pontos de Wolff com poliglactina 910. Os animais foram avaliados clinicamente, por meio de radiografias semanais, e histologicamente após os períodos de 15, 30, 60, 90 e 120 dias. A conservação do pino ósseo em glicerina a 98% foi avaliada por meio de exames microbiológicos. Em todos os animais, pode-se notar, clinicamente, excelente adaptação à cirurgia e normalidade do uso do membro já radiologicamente pode-se observar formação de calo ósseo e cicatrização da fratura. Histologicamente pode-se observar que ocorreu formação de calo ósseo 15 dias após a cirurgia e cicatrização com remodelação completa a partir dos 90 dias. Nesse exame, além de leve a moderada reação inflamatória no período inicial de avaliação, nenhum outro evento foi notado nos períodos subseqüentes. Concluiu-se que a técnica e os materiais utilizados se tornam uma opção altamente viável na osteossíntese umeral transversa de pombos domésticos.The objective of the present study was to evaluate the use of a homologous bone intramedullary pin, conserved in glycerin at 98% associated to hemicerclage with a thread of polyglactina 910 in the transverse humerus osteosynthesis of domestic pigeon (Columba livia. The distal part of the

  6. Variations in dark respiration and mitochondrial numbers within needles of Pinus radiata grown in ambient or elevated CO2 partial pressure

    International Nuclear Information System (INIS)

    Griffin, K. L.; Anderson, O. R.; Tissue, D. T.; Turnbull, M. H.; Whitehead, D.

    2004-01-01

    An experiment involving comparison of within-leaf variations in cell size, mitochondrial numbers and dark respiration in the most recently expanded tip, the mid-section and the base of needles of Pinus radiata grown for four years at ambient and elevated carbon dioxide partial pressure, is described. Results showed variation in mitochondrial numbers and respiration along the length of the needle, with the highest number of mitochondria per unit cytoplasm and the highest rate of respiration per unit leaf area at the base of the needle. Elevated carbon dioxide pressure caused the number of mitochondria per unit cytoplasm to double regardless of location (tip, basal or mid sections). Under these conditions, greatest mitochondrial density was observed at the tip. The mean size of mitochondria was not affected by either growth at elevated carbon dioxide pressure or by position on the needle. Respiration per unit leaf area at elevated carbon dioxide pressure was highest at the tip of needles, decreasing towards the middle and basal sections. The observed data supports the hypothesis that the highest number of mitochondria per unit area of cytoplasm occurs at the base of the needle, but does not support the hypothesis that the lowest rate of respiration also occurs at the base. It is suggested that the relationship that determines the association between structure and function in these needles is more complex than previously thought. 33 refs., 4 tabs., 1 fig

  7. Treatment of Cr/sup 3+/ contaminated soil by solid tea wastage I. A study of physiological processes of Vigna radiata

    International Nuclear Information System (INIS)

    Azmat, R.; Akhter, Y.; Sara Qureshi, S.; Ahmed, T.

    2010-01-01

    This study describes the option of using domestic tea waste in soil contaminated with the Cr/sup 3+/ trace metal due to industrial and mine activity, continuously discharging in the land and aquatic resources. This disposal of industrial wastage without proper treatment is responsible for the lowering of crop productivity with the accumulation of essential and non essential trace metals in the plants. On the other hand domestic waste management in soil and aquatic resources are also accountable for the reduced field productivity. This research discusses the proper domestic waste management in the agriculture land for the cultivation of crop in the contaminated soil. Vigna radiata has been selected as a crop to check the effects of Cr/sup 3+/ and its deletion in the contaminated soil. The highest yield was obtained when soil was mixed with tea wastage instead of spreaded tea wastage. Seed germination, morphology and physiology of 15 days old plant showed remarkable improvement in the plant growth including seed germination with activated tea wastage in the presence of Cr/sup 3+/ as compared to those plants which were grown in Cr/sup 3+/ contaminated soil only. Biochemical analysis of seedling showed an increase in the concentration of chlorophyll, carbohydrates, protein and amino acids, which confirms the remediation of contaminated soil through tea wastage. It was concluded that proper use of domestic waste can be helpful to increase the soil fertility and can concentrate the heavy toxic metals in it through complex formation. (author)

  8. Impact of pesticides on plant growth promotion of Vigna radiata and non-target microbes: comparison between chemical- and bio-pesticides.

    Science.gov (United States)

    Gupta, Sukriti; Gupta, Rashi; Sharma, Shilpi

    2014-08-01

    To compare the target and non-target effects of two chemical-pesticides (chlorpyrifos and endosulfan) with that of a bio-pesticide (azadirachtin), Vigna radiata (mung bean) was grown in a randomized pot experiment with recommended and higher application rates of pesticides. Colony counts enumerating specific microbial populations, viz. fungi, Pseudomonas, nitrogen-fixing bacteria, and phosphate-solubilizing microorganisms, were performed. In addition, several plant growth parameters such as root and shoot lengths were also monitored. It was observed that the pesticides exerted a suppressive effect on different microbial communities under study in the initial 30 days period. The bacterial and fungal populations in chlorpyrifos treated plants increased thereafter. Endosulfan resulted in enhancement of fungi and nitrogen-fixing bacteria, although phosphate-solubilizing microorganisms were suppressed at higher application rates. Azadirachtin, which is gaining popularity owing to its biological origin, did not result in enhancement of any microbial populations; on the other hand, it had a deleterious effect on phosphate-solubilizing bacteria. This study is the first to evaluate the non-target effects of pesticides with a comparison between chemical- and bio-pesticides, and also stresses the importance of critical investigation of bio-pesticides before their wide spread application in agriculture.

  9. Effect of liming and organic and inorganic fertilization on soil carbon sequestered in macro-and microaggregates in a 17-year old Pinus radiata silvopastoral system.

    Science.gov (United States)

    Mosquera-Losada, M R; Rigueiro-Rodríguez, A; Ferreiro-Domínguez, N

    2015-03-01

    Agroforestry systems have been recognized as a potential greenhouse gas mitigation strategy under the Kyoto Protocol because of their ability to absorb carbon dioxide from the atmosphere and store carbon mainly in the soil. Soil particle size and land management practices are known to have a considerable influence on carbon storage in soils. This study evaluated changes in soil chemical and physical properties, and quantified and compared the amount of C stored in the bulk soil and in three different soil fractions (250-2000, 53-250 and silvopastoral system located on an acidic forest soil under Pinus radiata D. Don. Areas of this system were subjected ten years ago to one of nine fertilization treatments: three different doses of sewage sludge or no fertilization, all with or without the addition of lime, and mineral fertilizer with no liming. Seventeen years after reforestation and seven years after canopy closure, strong gradients with soil depth were found regarding soil bulk density, pH and carbon storage. Intense soil management (high doses of sewage sludge and liming) generally reduced soil carbon storage, mainly in coarse aggregates, but this could be compensated by the increase in tree and pasture development observed in soils subject to intermediate sewage sludge doses. Copyright © 2014 Elsevier Ltd. All rights reserved.

  10. Tillage and residue management effect on soil properties, crop performance and energy relations in greengram (Vigna radiata L. under maize-based cropping systems

    Directory of Open Access Journals (Sweden)

    J.R. Meena

    2015-12-01

    Full Text Available Effect of tillage and crop residue management on soil properties, crop performance, energy relations and economics in greengram (Vigna radiata L. was evaluated under four maize-based cropping systems in an Inceptisol of Delhi, India. Soil bulk density, hydraulic conductivity and aggregation at 0–15 cm layer were significantly affected both by tillage and cropping systems, while zero tillage significantly increased the soil organic carbon content. Yields of greengram were significantly higher in maize–chickpea and maize–mustard systems, more so with residue addition. When no residue was added, conventional tillage required 20% higher energy inputs than the zero tillage, while the residue addition increased the energy output in both tillage practices. Maize–wheat–greengram cropping system involved the maximum energy requirement and the cost of production. However, the largest net return was obtained from the maize–chickpea–greengram system under the conventional tillage with residue incorporation. Although zero tillage resulted in better aggregation, C content and N availability in soil, and reduced the energy inputs, cultivation of summer greengram appeared to be profitable under conventional tillage system with residue incorporation.

  11. Elevated [CO2] does not ameliorate the negative effects of elevated temperature on drought-induced mortality in Eucalyptus radiata seedlings.

    Science.gov (United States)

    Duan, Honglang; Duursma, Remko A; Huang, Guomin; Smith, Renee A; Choat, Brendan; O'Grady, Anthony P; Tissue, David T

    2014-07-01

    It has been reported that elevated temperature accelerates the time-to-mortality in plants exposed to prolonged drought, while elevated [CO(2)] acts as a mitigating factor because it can reduce stomatal conductance and thereby reduce water loss. We examined the interactive effects of elevated [CO(2)] and temperature on the inter-dependent carbon and hydraulic characteristics associated with drought-induced mortality in Eucalyptus radiata seedlings grown in two [CO(2)] (400 and 640 μL L(-1)) and two temperature (ambient and ambient +4 °C) treatments. Seedlings were exposed to two controlled drying and rewatering cycles, and then water was withheld until plants died. The extent of xylem cavitation was assessed as loss of stem hydraulic conductivity. Elevated temperature triggered more rapid mortality than ambient temperature through hydraulic failure, and was associated with larger water use, increased drought sensitivities of gas exchange traits and earlier occurrence of xylem cavitation. Elevated [CO(2)] had a negligible effect on seedling response to drought, and did not ameliorate the negative effects of elevated temperature on drought. Our findings suggest that elevated temperature and consequent higher vapour pressure deficit, but not elevated [CO(2)], may be the primary contributors to drought-induced seedling mortality under future climates. © 2013 John Wiley & Sons Ltd.

  12. Ethanol extract of Lycoris radiata induces cell death in B16F10 melanoma via p38-mediated AP-1 activation.

    Science.gov (United States)

    Son, Minsik; Kim, Aeyung; Lee, Jaewoo; Park, Chul-Hong; Heo, Jin-Chul; Lee, Hyun-Jin; Lee, Sang-Han

    2010-08-01

    Some active alkaloids isolated from Lycoris, a bulbous perennial herb, was shown to possess various anti-tumor and anti-inflammatory activities. In this study, we evaluated the in vitro apoptotic effect of ethanol extract from Lycoris radiata (LRE) and further probed the underlying molecular mechanisms of LRE effects. The survival rate of B16F10 melanoma cells exposed to LRE was decreased in a dose-dependent manner, cell growth was retarded by arresting cell cycle at G1 phase and apoptotic appearance such as caspase-3 activation as well as DNA fragmentation was observed by LRE treatment. In addition, LRE induced p38 and c-Jun phosphorylation, followed by activation of transcription factor AP-1. Pretreatment with the p38 inhibitor (SB203580) blocked LRE-induced AP-1 transcriptional activity, and curcumin, AP-1 inhibitor, dramatically inhibited LRE-induced apoptosis in B16F10 melanoma cells. Our results collectively indicate that LRE-mediated apoptosis occurs through the activation of p38 and AP-1 pathway and potentially LRE exhibits anti-cancer activity against B16F10 melanoma cells.

  13. Chronic suppression of testicular function by constant infusion of gonadotropin-releasing hormone agonist and testosterone supplementation in the bonnet monkey (Macaca radiata).

    Science.gov (United States)

    Ravindranath, N; Ramesh, V; Krishnamurthy, H N; Rao, A J; Moudgal, R N

    1992-03-01

    To study the efficacy of long-term buserelin acetate infusion to desensitize pituitary and block testicular function in adult male monkeys (Macaca radiata). Proven fertile male monkeys exhibiting normal testicular function. Each of the control (n = 5) and experimental monkeys (n = 10) received a fresh miniosmotic pump every 21 days, whereas pumps in controls delivered vehicle of experimentals released 50 micrograms buserelin acetate every 24 hours. On day 170 (renewed every 60 days) a silastic capsule containing crystalline testosterone (T) was implanted in the experimental monkeys. At the end of 3 years, treatment was stopped, and recovery of testicular function and fertility monitored. (1) Treatment resulted in marked reduction of nocturnal but not basal serum T; (2) the pituitary remained desensitized to buserelin acetate throughout the 3-year period; (3) animals were largely azoospermic with occasional oligospermia exhibited by two monkeys; and (4) withdrawal of treatment restored testicular function, with 70% of animals regaining fertility. Long-term infertility (but restorable) can be induced in male monkeys by constant infusion of buserelin acetate and T.

  14. Effects of Bidens pilosa L. var. radiata SCHERFF treated with enzyme on histamine-induced contraction of guinea pig ileum and on histamine release from mast cells.

    Science.gov (United States)

    Matsumoto, Takayuki; Horiuchi, Masako; Kamata, Katsuo; Seyama, Yoshiyuki

    2009-06-01

    The medical mechanism against type I allergies is to block the release or production of chemical mediators from mast cells or to block the H(1)-receptor signaling. We previously reported that the anti-allergic action of the dry powder from Bidens pilosa L. var. radiata SCHERFF treated with the enzyme cellulosine (eMMBP) was dependent on the inhibition of histamine release from mast cells. Here, we investigate that the effect of fractions in eMMBP on the histamine-induced contraction in guinea pig ileum and on the release of histamine in rat peritoneal mast cells. The histamine-induced contraction in guinea pig ileum is dose-dependently inhibited by ketotifen, an antagonist of H(1)-receptor. Fractions contained caffeic acid, caffeoylquinic acid and fractions contained flavonoids such as hyperin and isoquercitrin in eMMBP inhibit histamine release from mast cells, but only flavonoids such as hyperin, isoquercitrin and rutin suppress the histamine-induced contraction in guinea pig ileum. Moreover, the histamine-induced contraction was not affected by caffeic acid, however, such contraction was significantly inhibited by rutin. These results suggest that the primary antagonists of H(1)- receptor are different from the components in eMMBP that inhibit histamine release, and that these components participate in the anti-allergic activity of eMMBP.

  15. A facile biomimetic preparation of highly stabilized silver nanoparticles derived from seed extract of Vigna radiata and evaluation of their antibacterial activity

    Science.gov (United States)

    Choudhary, Manoj Kumar; Kataria, Jyoti; Cameotra, Swaranjit Singh; Singh, Jagdish

    2016-01-01

    The significant antibacterial activity of silver nanoparticles draws the major attention toward the present nanobiotechnology. Also, the use of plant material for the synthesis of metal nanoparticles is considered as a green technology. In this context, a non-toxic, eco-friendly, and cost-effective method has been developed for the synthesis of silver nanoparticles using seed extract of mung beans ( Vigna radiata). The synthesized nanoparticles have been characterized by UV-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), atomic absorption spectroscopy (AAS), and X-ray diffraction (XRD). The UV-visible spectrum showed an absorption peak at around 440 nm. The different types of phytochemicals present in the seed extract synergistically reduce the Ag metal ions, as each phytochemical is unique in terms of its structure and antioxidant function. The colloidal silver nanoparticles were observed to be highly stable, even after 5 months. XRD analysis showed that the silver nanoparticles are crystalline in nature with face-centered cubic geometry and the TEM micrographs showed spherical particles with an average size of 18 nm. Further, the antibacterial activity of silver nanoparticles was evaluated by well-diffusion method and it was observed that the biogenic silver nanoparticles have an effective antibacterial activity against Escherichia coli and Staphylococcus aureus. The outcome of this study could be useful for nanotechnology-based biomedical applications.

  16. Influence of reaction conditions and the char separation system on the production of bio-oil from radiata pine sawdust by fast pyrolysis

    Energy Technology Data Exchange (ETDEWEB)

    Park, Hyun Ju; Park, Young-Kwon; Kim, Joo Sik [Faculty of Environmental Engineering, University of Seoul, 90 Jeonnong-Dong, Dondaemun-Gu, Seoul 130-743 (Korea)

    2008-08-15

    Radiata pine sawdust was pyrolyzed in a bubbling fluidized bed equipped with a char separation system. The influence of the reaction conditions on the production of bio-oil was investigated through the establishment of mass balance, and the examination of the products' chemical and physical characteristics. The optimal reaction temperature for the production of bio-oil was between 673 and 723 K, and the yield was above 50 wt.% of the product. An optimal feed size also existed. In a particle with a size that was less than 0.3 mm, the bio-oil yield decreased due to overheating, which led to gas formation. A higher flow rate and feeding rate were found to be more effective for the production of bio-oil, but did not significantly affect it. The main compounds of bio-oil were phenolics, including cresol, guaiacol, eugenol, benzendiol and their derivatives, ketones, and aldehydes. In addition, high-quality bio-oils, which contained less than 0.005 wt.% of solid, no ash and low concentrations of alkali and alkaline earth metals, were produced due to the char removal system. (author)

  17. Echography of the Cervix and Uterus during the Proliferative and Secretory Phases of the Menstrual Cycle in Bonnet Monkeys (Macaca radiata)

    Science.gov (United States)

    Chaudhari, Uddhav K; Metkari, Siddnath M; Manjaramkar, Dhyananjay D; Sachdeva, Geetanjali; Katkam, Rajendra; Bandivdekar, Atmaram H; Mahajan, Abhishek; Thakur, Meenakshi H; Kholkute, Sanjiv D

    2014-01-01

    We undertook the present study to investigate the echographic characteristics of the uterus and cervix of female bonnet monkeys (Macaca radiata) during the proliferative and secretory phases of the menstrual cycle. The cervix was tortuous in shape and measured 2.74 ± 0.30 cm (mean ± SD) in width by 3.10 ± 0.32 cm in length. The cervical lumen contained 2 or 3 colliculi, which projected from the cervical canal. The echogenicity of cervix varied during proliferative and secretory phases. The uterus was pyriform in shape (2.46 ± 0.28 cm × 1.45 ± 0.19 cm) and consisted of serosa, myometrium, and endometrium. The endometrium generated a triple-line pattern; the outer and central lines were hyperechogenic, whereas the inner line was hypoechogenic. The endometrium was significantly thicker during the secretory phase (0.69 ± 0.12 cm) than during the proliferative phase (0.43 ± 0.15 cm). Knowledge of the echogenic changes in the female reproductive organs of bonnet monkeys during a regular menstrual cycle may facilitate understanding of other physiologic and pathophysiologic changes. PMID:24411775

  18. Exogenous Spermidine Alleviates Low Temperature Injury in Mung Bean (Vigna radiata L. Seedlings by Modulating Ascorbate-Glutathione and Glyoxalase Pathway

    Directory of Open Access Journals (Sweden)

    Kamrun Nahar

    2015-12-01

    Full Text Available The role of exogenous spermidine (Spd in alleviating low temperature (LT stress in mung bean (Vigna radiata L. cv. BARI Mung-3 seedlings has been investigated. Low temperature stress modulated the non-enzymatic and enzymatic components of ascorbate-glutathione (AsA-GSH cycle, increased H2O2 content and lipid peroxidation, which indicate oxidative damage of seedlings. Low temperature reduced the leaf relative water content (RWC and destroyed leaf chlorophyll, which inhibited seedlings growth. Exogenous pretreatment of Spd in LT-affected seedlings significantly increased the contents of non-enzymatic antioxidants of AsA-GSH cycle, which include AsA and GSH. Exogenous Spd decreased dehydroascorbate (DHA, increased AsA/DHA ratio, decreased glutathione disulfide (GSSG and increased GSH/GSSG ratio under LT stress. Activities of AsA-GSH cycle enzymes such as ascorbate peroxidase (APX, monodehydroascorbate reductase (MDHAR, dehydroascorbate reductase (DHAR and glutathione reductase (GR increased after Spd pretreatment in LT affected seedlings. Thus, the oxidative stress was reduced. Protective effects of Spd are also reflected from reduction of methylglyoxal (MG toxicity by improving glyoxalase cycle components, and by maintaining osmoregulation, water status and improved seedlings growth. The present study reveals the vital roles of AsA-GSH and glyoxalase cycle in alleviating LT injury.

  19. Effect of cyclic loading on fracture strength of endodontically treated teeth restored with conventional and esthetic posts Efeito da carga cíclica na resistência de dentes tratados endodonticamente restaurados com pinos dentários convencionais e estéticos

    Directory of Open Access Journals (Sweden)

    Anuar Antônio Xible

    2006-08-01

    core system after cyclic loading.INTRODUÇÃO: Os sistemas de núcleos intra-radiculares estéticos foram recentemente introduzidos no mercado. Não existem muitos trabalhos na literatura comparando seu comportamento em relação aos sistemas de pinos metálicos convencionais quando submetidos à testes com carga cíclica. OBJETIVOS: este estudo comparou a taxa de sobrevivência, resistência à fratura e modo de fratura de dentes tratados endodonticamente reconstruídos com sistemas de núcleos intra-radiculares metálicos convencionais e estéticos, restaurados com coroas de porcelana pura e submetidos à carga cíclica. MATERIAIS E MÉTODOS: trinta caninos tiveram as coroas removidas 1,5mm acima da junção cemento-esmalte e preparados para coroa de porcelana pura deixando 1,5mm de dentina acima do término do preparo. Os dentes foram distribuídos em 3 grupos de 10. O grupo 1 foi restaurado com pinos de cerâmica de zircônia e núcleos de preenchimento em cerâmica vítrea termo-injetada. O grupo 2 foi restaurado com pinos de resina composta reforçada por fibra de vidro e o grupo 3 com pinos de titânio. Nos grupos 2 e 3 foi usada resina composta reforçada com fibra de vidro como material para núcleo de preenchimento; os dentes foram restaurados com coroas totais e tanto os pinos quanto as coroas de porcelana foram cimentados com um sistema de cimentação resinosa de polimerização dupla. Os espécimes foram incluídos em resina acrílica e submetidos à uma carga de 250N por 500,000 ciclos, numa freqüência de 1,7Hz sendo em seguida submetidos à carga estática em uma máqina de testes universal até a falha. Os dados foram analisados estatisticamente com os testes ANOVA a 1 critério e Exato de Fischer (alfa=.05. RESULTADOS: a taxa de sobrevivência foi de 100%; os valores de resistência à fratura em N (DP foram: grupo 1 = 886,50(170,6, grupo 2 = 762,2(113,6 e grupo 3 = 768,9(72,9. Não houve diferença estatística de resistência à fratura entre os

  20. del alcoholismo

    Directory of Open Access Journals (Sweden)

    Rodrigo Arias Duque

    2005-01-01

    Full Text Available Desde el punto de vista farmacológico, es importante comprender qué es el alcohol y cómo actúa en el organismo. No existe una causa simple, sino una interacción complicada de factores neuroquímicos, fisiológicos, psicológicos y sociales que originan y desarrollan esta grave enfermedad fármaco-dependiente. La acción psicofisiológica y farmacodinámica del alcohol es fundamentalmente depresiva, por la reducción de la transmisión sináptica en el sistema nervioso humano. Es un hecho conocido que el consumo excesivo de alcohol causa una disfunción aguda y crónica del cerebro, produciendo trastornos en el sistema nervioso central, presentando alteraciones en la memoria y en las funciones intelectuales como cálculo, comprensión y aprendizaje. A nivel hepático tiene lugar, en su mayoría, el metabolismo del alcohol, produciéndose un hígado graso alcohólico, aumentando el tamaño, terminando en necrosis e inflamación grave del hígado; esto se llama hepatitis alcohólica, y si se sigue consumiendo alcohol se desarrollará la cirrosis. El alcohol también ha estado relacionado con alteraciones del miocardio; se ha constatado en animales de experimentación sanos que tanto la velocidad de contracción del músculo cardiaco y su máxima tensión disminuyen en presencia del alcohol, como consecuencia, la fuerza de cada contracción y el aumento de presión en el ventrículo izquierdo son menores, perdiendo eficacia el corazón como bomba.

  1. Fixador esquelético pino-resina acrílica e enxerto ósseo esponjoso no tratamento de complicações secundárias à imobilização inadequada de fratura do rádio e ulna em cães Acrylic-pin external fixator and cancellous bone graft in the treatment of complications caused by inadequate immobilization of radius and ulna fracture in dogs

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    Sheila Canevese Rahal

    2005-10-01

    Full Text Available O objetivo do estudo foi avaliar a eficácia do fixador esquelético pino-resina, configuração tipo II, coadjuvado pelo enxerto ósseo esponjoso autólogo, no tratamento das complicações secundárias à imobilização inadequada de fraturas do rádio e ulna em 10 cães, com peso entre 1,8 e 33,6 kg. Detectou-se não-união (n=4, osteomielite (n=1, má-união (n=1, falência ou quebra de implante (n=4, sendo 60% das lesões referente ao uso prévio de pino intramedular no rádio. A montagem do fixador foi realizada com transfixação de pinos lisos em sua maioria angulados, cujas extremidades excedentes foram dobradas e estabilizadas com resina acrílica. Em todos os casos, utilizou-se enxerto esponjoso autólogo fresco, após debridamento do foco de fratura. O tempo de permanência do aparelho variou entre 45 dias e 5 meses e a maior complicação foi o afrouxamento dos pinos transfixantes. A consolidação das fraturas ocorreu por formação de calo periosteal de mínimo a moderado, indicando boa rigidez da montagem.The aim of this study was to evaluate the acrylic-pin external fixator, type II-configuration, and cancellous bone autograft for treating complications of radius and ulna fractures in 10 dogs weighing between 1.8 and 33.6 kg. Nonunion (n=4, osteomyelitis (n=1, malunion (n=1, failure or breakage of implant (n=4 were detected, and 60 % of them were associated with previous intramedullary pin placement in the radius. The fixator frame was constructed using most of the smooth transfixation pins angled. The fixation rods were constructed by placing acrylic resin over the ends of the transfixation pins that were previously bent. In all cases fresh cancellous bone autograft was used after cleaning of the fracture site. The permanence time of the external fixator ranged from 45 days to 5 months, and the most important complication was pin loosening. Fracture healing was by minimal to moderate periosteal callus, suggesting good rigidity

  2. Culturas del Mundo

    DEFF Research Database (Denmark)

    Benwell, Ann Fenger; Costa, Alberto; Waehle, Espen

    2006-01-01

    ’Culturas del mundo. Colecciones del Museo Nacional de Dinamarca’ with Ann Fenger Benwell in Culturas del Mundo. Colecciones del Museo Nacional de Dinamarca, ed. Silvia Sauquet, Fundación "la Caixa", Barcelona 2006, pp. 31-39......’Culturas del mundo. Colecciones del Museo Nacional de Dinamarca’ with Ann Fenger Benwell in Culturas del Mundo. Colecciones del Museo Nacional de Dinamarca, ed. Silvia Sauquet, Fundación "la Caixa", Barcelona 2006, pp. 31-39...

  3. Increase in the yield of mung bean (Vigna radiata [L.] R. Wilczek) with storage of radiation-modified kappa-carrageenan

    International Nuclear Information System (INIS)

    Aurigue, F.B.; Montefalcon, D.R.V.; Dela Cruz, R.M.M.; Abad, L.V.

    2015-01-01

    Kappa-carrageenan is a sulphated polysaccharide naturally present in seaweeds. Upon gamma radiation, radiolysis produces low molecular weight κ-carrageenan with the cleavage of some of its sulphate groups. Consequently, the acidic solution may further hydrolyze κ-carrageenan. The study aims to determine the effects of application by foliar spraying of freshly prepared irradiated κ-carrageenan solution and those which has been stored for 3 months on the yield of potted mungbean (Vigna radiata) plants. Foliar application of radiation-modified κ-carrageenan solution on the Kulabo variety two weeks after sowing, at flower initiation, and at fruit formation stage resulted in 30.8% increase in pod yield and 50.2% increase in seed yield compared to plants similarly treated with NitroPlus inoculants only. Pod yield and seed yield advantage over the control plants (no inoculants and no fertilizer) were 57.2% and 83% respectively no fertilizer was used in all treatments. These result confirm the previous finding that irradiated κ-carrageenan solution sprayed every two weeks inoculants only. There was 200% yield advantage over the negative control. The increase in yield is attributed to the longer length of pod, higher number of seed per pod, heavier 100-seed weight. Interestingly, the 3 months-old solution gave better result compared to a freshly irradiated one. There was 26.5% and 26.8% difference in pod yield and seed yield, respectively. Compared with the Control plants of the Kulabo variety, those sprayed with stored κ-carrageenan solution had 105% advantage in seed yield. It was proposed that the degradation process of the oligo-κ-carrageenan continue during storage because of the acidic nature of the solution. Undoubtedly, irradiated κ-carrageenan solution has plant growth promoting activity that increase yield mung bean by spraying on the leaves at least three times before fruit development.(author)

  4. Research resources: comparative microRNA profiles in human corona radiata cells and cumulus oophorus cells detected by next-generation small RNA sequencing.

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    Xian-Hong Tong

    Full Text Available During folliculogenesis, cumulus cells surrounding the oocyte differentiate into corona radiata cells (CRCs and cumulus oophorus cells (COCs, which are involved in gonadal steroidogenesis and the development of germ cells. Several studies suggested that microRNAs (miRNAs play an important regulatory role at the post-transcriptional level in cumulus cells. However, comparative miRNA profiles and associated processes in human CRCs and COCs have not been reported before. In this study, miRNA profiles were obtained from CRCs and COCs using next generation sequencing in women undergoing controlled ovarian stimulation for IVF. A total of 785 and 799 annotated miRNAs were identified in CRCs and COCs, while high expression levels of six novel miRNAs were detected both in CRCs and in COCs. In addition, different expression patterns in CRCs and COCs were detected in 72 annotated miRNAs. To confirm the miRNA profile in COCs and CRCs, quantitative real-time PCR was used to validate the expression of annotated miRNAs, differentially expressed miRNAs, and novel miRNAs. The miRNAs in the let-7 family were found to be involved in the regulation of a broad range of biological processes in both cumulus cell populations, which was accompanied by a large amount of miRNA editing. Bioinformatics analysis showed that amino acid and energy metabolism were targeted significantly by miRNAs that were differentially expressed between CRCs and COCs. Our work extends the current knowledge of the regulatory role of miRNAs and their targeted pathways in folliculogenesis, and provides novel candidates for molecular biomarkers in the research of female infertility.

  5. Potential use of Vitellogenin and Zona radiata proteins as biomarkers of endocrine disruption in Peregrine falcon exposed to organochlorine compounds (DDTs, PCBs, PCDDs and PCDFs)

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez, B. [CSIC, Inst. of Organic Chemistry, Madrid (Spain); Mori, G.; Concejero, M.A.; Casini, S.; Fossi, M.C. [Siena Univ. (Italy)

    2004-09-15

    Many different classes of environmental contaminants such as industrial chemicals (e.g. alkylphenols, polychlorinated biphenyls, pesticides, PAHs, polychlorinated dibenzo-p-dioxins, and dibenzofurans), ''can cause adverse effects in the reproductive functions of intact organisms or their progenies, consequent to changes in endocrine functions'' showing a so-called Endocrine disruptor activity. Avian raptor species, such as peregrine falcon (Falco peregrinus) for their peculiar position in the food web are potentially at risk in relation to the accumulation of Persistent Organic Pollutants (POPs) and toxic metals. Recent studies carried out with Peregrine falcon (Falco peregrinus) in Spain reveal a contamination with organochlorine compounds (PCDDs, PCDFs, PCBs and DDTs) which could be responsible of the decrease of successful pairs observed during the last ten years. Thus there is a need to develop sensitive diagnostic monitoring tools for the evaluation of toxicological risk and potential effects on the reproductive function and population dynamic of avian top predator species. Two markers for the detection of EDs effects in oviparous vertebrates are induction of Vitellogenin (Vtg) and Zona Radiata Proteins (ZR). Vtg, a complex phospholipoglycoprotein, is the major egg-yolk protein precursor and is normally synthesized by females in response to estradiol. ZR together with Zona Pellucida (ZP) constitutes in birds part of the eggshell. These proteins (Vtg, ZR and ZP) are normally synthesised in the liver as a response to an estrogen signal given by Estradiol. Males and sexually undifferentiated specimens also have the Vtg and ZR genes but do not express them unless exposed to estrogenic compounds. The main aim of this preliminary study was to develop methods for the detection of Vtg and ZR in plasma obtained from peregrine falcon as a specific biomarker for the evaluation of the effects of EDCs.

  6. Kajian Jumlah Biji per Lubang Tanam dan Paket Pupuk terhadap Pertumbuhan dan Hasil Kacang Hijau (Vigna radiata L. Varietas Vima-1

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    I PUTU PANCA DIANTARA PUTRA

    2016-05-01

    Full Text Available Study of the Number of the Amount of Beed a Hole Planting and Packages Fertilizer onGrowth and Yield of Mung Bean (Vigna radiata L. Varieties Vima-1. Mung bean (Vignaradiata L. is one of bean plant – nuts for many consumption in Indonesia. The low productwas’nt cultivation techniques that supposed to, including the amount of seed each holeplanting and fertilizer giving them. The study aims to determine the amount seed hole theplanting and fertilizer best to the growth and yield of mung bean varieties vima-1. Researchcarried out in Subak Basangbe, Perean Kangin village, Baturiti – Tabanan, in October –December, 2014. The study was designed using a factorial randomized block design. The firstfactor the amount of seed a hole planting (1, 2, 3 seed, factor two of fertilizer (organicfertilizer compost, fertilizer chemical urea + TSP + KCl, organic fertilizer liquid biourin,organic fertilizer compost and fertilizer chemical urea + TSP + KCl, organic fertilizercompost and organic fertilizer liquid biourin, fertilizer chemical urea + TSP + KCl andorganic fertilizer liquid biourin. The growth of mung bean varieties Vima-1 is mainly ofplant height and number of leaves affected very real by the number of seeds planting hole andfertilizer package. Treatment of the amount of seed planting hole and fertilizer packages tovery significant effect on yield components, especially the number of pods and number ofseeds of plants on mung bean varieties Vima-1. Treatment of the amount of seed planting holeaffects most of the components of plant growth and yield components of mung bean. Thehighest yield on three planting seeds per hole that is 3,67 t / ha dry weight oven.

  7. Comunidad ectomicorrícica en una cronosecuencia de Pinus radiata (Pinophyta: Pinaceae de la zona de transición climática mediterráneo-templada de Chile central The ectomycorrhizal community in a chronosequence of Pinus radiata (Pinophyta: Pinaceae of the transitional Mediterranean-temperate climatic zone of central Chile

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    YUSSI M PALACIOS

    2012-03-01

    Full Text Available En ecosistemas naturales y plantaciones, las coníferas establecen asociaciones mutualistas con una comunidad diversa de hongos micorrícicos. El estudio de este tema en Sudamérica es aún incipiente, y no existen antecedentes sobre la dinámica temporal de esta comunidad, y menos de sus potenciales causas, a pesar de su importancia para un país forestal como Chile. En el presente trabajo se evaluó la dinámica de la comunidad ectomicorrícica, identificando y cuantificando los hongos formadores de esta asociación en raíces finas de Pinus radiata en plantaciones de 3, 10 y 20 años. Los resultados confirman que la comunidad ectomicorrícica de P. radiata cambia con la edad de los árboles, la cual difiere más bien en el patrón de dominancia que en la riqueza de especies, separándose un primer grupo de árboles de 3 y 10 años de un segundo grupo de 20 años. Un total de once morfotipos de micorrizas fueron diferenciados. Cuatro de ellos, identificados como Hebeloma crustuliniforme, Inocybe sp., Russula sardonia y Pinirhiza spinulosa, fueron los más abundantes (77, 29, 78 y 8 % respectivamente, mientras las otras se encontraron colonizando menos de 100 puntas de raíz (In natural forest ecosystems and plantations, most trees live in mutualistic association with mycorrhizal fungi. Studies of this association in South America are still scarce, especially when referring to the causes of temporal dynamics of this symbiotic community, despite its importance in countries with a thriving forestry industry like Chile. This study evaluates the dynamics of the ectomycorrhizal community of Pinus radiata stands of 3, 10 and 20 years of age, identifying and quantifying the most common fungal colonizers of fine roots in each age class. The results confirm that the mycobiont community changes with host tree age but that age classes differ in dominance patterns rather than in species richness, with the three- and ten-year-old tree cohorts forming a

  8. Sustitución de la sabana nativa con plantaciones de Pinus caribaea (Pinaceae en Venezuela: efecto sobre parámetros indicadores de cambios en el carbono del suelo

    Directory of Open Access Journals (Sweden)

    Yrma Gómez

    2008-12-01

    Full Text Available Una gran extensión (615000 has de las sabanas nativas de los Llanos Orientales de Venezuela está siendo reemplazada por plantaciones de Pinus caribaea var. hondurensis; sin embargo, hasta ahora existe escasa información sobre el impacto de este manejo del suelo sobre los parámetros indicadores de la dinámica del carbono en el suelo. El objetivo de esta investigación fue determinar el efecto de la variabilidad temporal y la sustitución sobre el contenido de carbono orgánico total (COT, carbono hidrosoluble (CHS, carbono microbiano (Cmic, respiración basal (RB, cociente metabólico microbiano (qCO2 y la relación Cmic/Corg. Las propiedades químicas y parámetros biológicos seleccionados fueron determinados en plantaciones de P. caribaea de 3 y 29 años de edad y en una sabana nativa adyacente a estas plantaciones, la cual fue considerada como control. En cada sitio de muestreo recolectamos nueve muestras compuestas (0-10 cm de profundidad. Los parámetros estudiados no mostraron un patrón definido in relación a la variabilidad temporal. Hay mayor preservación del carbono dentro de la biomasa microbiana presente en suelos de Uverito en plantaciones de pinos. La tasa de respiración basal y el cociente metabólico indican que en estos suelos existe una comunidad microbiana poco activa, la cual es más eficiente en la utilización del carbono en las plantaciones de pino. La relación Cmic/Corg indica que en las plantaciones la biomasa microbiana constituye una importante reserva del carbono en el suelo. La sabana nativa a plantaciones de pino caribeño en estos suelos puede ser considerada un manejo efectivo para incrementar la calidad del suelo en los llanos orientales de Venezuela, siempre y cuando se tome en cuenta la importancia ecológica de las sabanas.Substitution of native savanna by Pinus caribaea (Pinaceae plantations in Venezuela: effect on parameters that indicated changes in soil carbon content. A great extension (615 000

  9. Controles alternativos para el gorgojo del frijol (Acanthoscelides obtectus Say en granos almacenados a partir de materiales naturales y minerales

    Directory of Open Access Journals (Sweden)

    Carlos Ernesto Lopez-Monzon

    2017-03-01

    Full Text Available Con el fin de controlar el daño del gorgojo del frijol [Acanthoscelides obtectus (Say], se evaluó la efectividad en polvo de raíces deshidratadas de chilca (Senecio salignus DC., frutos deshidratados de pimienta negra (Piper nigrum L., fragmentos de madera de pino (Pinus oocarpa Schiede, maíz pulverizado (Zea mays L., cascabillo de frijol (Phaseolus vulgaris L., cal mezclada con ceniza, y arena de río. Se evaluaron ocho tratamientos, con cuatro repeticiones cada uno, en arreglo totalmente al azar. Los materiales naturales y minerales fueron colectados en el municipio de Malacatancito, Huehuetenango y el ensayo se montó en el laboratorio del Centro Universitario de Nor Occidente (Cunoroc, empleando por réplica un frasco de vidrio con capacidad de 1 L y aplicando a cada uno 100 g de semilla de frijol, 10 parejas de gorgojos adultos y 1 g de polvo de los materiales evaluados, según su tratamiento. El análisis se realizó 60 días después de la infestación, donde se evaluó: el porcentaje de daño del gorgojo del frijol, número de gorgojos vivos, correlación del porcentaje de daño versus número de gorgojos vivos y porcentaje de germinación del frijol. El polvo de pimienta negra y la mezcla de cal con ceniza evidenciaron los mejores resultados con el menor porcentaje de daño (1.64% y 3.55%, respectivamente. Las variables porcentaje de daño y número de gorgojos vivos marcaron una fuerte correlación con valor de r = .892. Se estableció que ninguno de los materiales utilizados influyó en la viabilidad de la semilla, registrándose porcentajes de germinación por arriba del 97% en todos los tratamientos. Se recomienda implementar estos productos en el almacenamiento del frijol, para contrarrestar los daños ocasionados por la plaga, obteniendo así beneficios económicos, sociales y ambientales.

  10. EXPERIENCIAS RELEVANTES EN LA ENSEÑANZA DE LA BIODIVERSIDAD, COMO ESTRATEGIA DE EDUCACIÓN AMBIENTAL, CON ESTUDIANTES DE SECUNDARIAEN LA INSTITUCIÓN EDUCATIVA DISTRITAL LOS PINOS DE LA CIUDAD DE BOGOTÁ

    Directory of Open Access Journals (Sweden)

    Andrés Fernando Herrera Guzmán

    2014-05-01

    Full Text Available Con el fin de dar a conocer la megadiversidad del territorio nacional y local en la comunidad educativa y promover su conservación, se implementan dos proyectos pedagógicos durante los años: 2011, 2012 y 2013; aplicando modelos didácticos como la indagación, la enseñanza para la comprensión, el cambio conceptual y el aprendizaje por descubrimiento, con el uso de tecnologías de la información y la comunicación y salidas ecológicas.  Se miden los aprendizajes de los educandos de grado octavo por medio de un test anual de entrada y salida, y la comparación de los resultados de pruebas de finales de periodo, en los que ha variado la intensidad del proyecto de aula (PA.  Se presenta un aumento del 10 % en los aprendizajes de los estudiantes por periodo, cuando hay una mayor intensidad académica del PA; de manera similar, se avanza en la adquisición de las competencias de conocimiento e interpretación de las jerarquías ecológicas de la biodiversidad desde un 11 % hasta un 24 % anual.  Adicionalmente, hay una gestión más efectiva de los recursos educativos.  Se concluye que la articulación de recursos naturales e institucionales es posible, por medio del desarrollo de propuestas didácticas; que mejoran los ambientes de aprendizaje y facilitan la formación ambiental para la valoración y uso sustentable de la diversidad biológica.

  11. Biomasa fúngica y bacteriana como indicadoras del secuestro de C en suelos de sabanas sustituidos por pinares en Uverito, Venezuela

    Directory of Open Access Journals (Sweden)

    Magalis Zabala

    2010-09-01

    Full Text Available Cualquier transformación de un ecosistema natural a un sistema agrícola o forestal conduce a una modificación importante no sólo del pool del carbono total, sino también del carbono asociado con la biomasa microbiana. Su cuantificación es importante en la determinación del impacto de las prácticas agrícolas y el cambio de uso de la tierra sobre la calidad del suelo. El objetivo de este estudio fue determinar, a través del método de inhibición selectiva, la biomasa fúngica y bacteriana y la relación (H:B en suelos de sabana nativa sustituidos por pinares (Pinus caribaea var. hondurensis, para establecer si éstos parámetros son indicadores sensibles de cambios en el contenido de carbono en suelos de Uverito, Venezuela. La relación de aditividad del inhibidor (RAI y la inhibición total por efecto combinado del inhibidor (ITC se llevaron a cabo para determinar, si los inhibidores microbianos tuvieron actividad sobre otros organismos para los cuales éstos no estaban destinados. La cuantificación de la biomasa fúngica y bacteriana se llevó a cabo mediante el uso de la cycloheximida como inhibidor fúngico, y la estreptomicina y el cloranfenicol como inhibidores bacterianos. Esta investigación evidencia que este cambio de uso de la tierra ejerció un efecto significativo sobre la biomasa microbiana del suelo, y muestra que en el sistema de pinares existe una dominancia del componente fúngico, en contraste con la sabana nativa, en la cual domina la biomasa bacteriana. La sustitución de la sabana nativa por plantaciones de pino en Uverito, promueve un mayor secuestro del carbono en el suelo. Los valores de la relación de aditividad del inhibidor (RAI tanto para la sabana nativa como para el sistema de pinares, resultaron ambos >1.0. La inhibición total combinada (ITC resultó menor en el sistema de pinares; a partir de lo cual, es posible inferir que una elevada proporción de la biomasa microbiana fue afectada por la combinaci

  12. Efeito dos parâmetros de processo na obtenção e na microestrutura de juntas alumínio-aço realizadas mediante soldagem por atrito com pino não consumível (SAPNC

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    Edwar Andrés Torres López

    2013-09-01

    Full Text Available Os resultados bem-sucedidos apresentados na literatura acerca da soldagem por atrito com pino não consumível das juntas alumínio-aço, desconsideram o aspecto e formação de defeitos na junta como pontos de referência para sua avaliação. Igualmente aumenta a controvérsia acerca da presença de compostos intermetálicos do tipo Fe xAl y, somado à falta de informação sobre sua origem. O objetivo deste trabalho é determinar parâmetros adequados para a obtenção de juntas alumínio-aço livres de defeitos e sua relação com a formação de fases deletérias durante a soldagem por atrito com pino. Foram obtidas juntas soldadas consolidadas e foi determinada a microestrutura resultante destas juntas soldadas da liga de alumínio 6063-T5 e aço AISI SAE 1020. Utilizou-se uma ferramenta de carbeto de tungstênio (WC-14Co a velocidades de rotação e de avanço de 300 rpm e 150 mm.min-1, respectivamente. Foram empregados deslocamentos da ferramenta de +0,5; +1,0 e +1,5 mm. Os resultados realçam a importância do aporte energético na obtenção de juntas alumínio-aço com aspecto superficial e penetração adequados. A análise microestrutural revela a formação de sete regiões na junta soldada, destacando a zona termo-mecanicamente afetada no lado do aço, uma banda de grãos ultra finos de ferrita e a ausência de compostos intermetálicos na interface alumínio-aço.

  13. Influence of the sealer and a plug in coronal leakage after post space preparation Influência do cimento obturador e de um "plug" na infiltração coronária após preparo para pino

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    Roberto Holland

    2004-09-01

    Full Text Available The subject of this paper was to conduct an in vitro study of the coronal leakage after root canal filling and post space preparation. One hundred single-rooted human teeth had their crowns removed and the canals prepared and filled by the lateral condensation technique with gutta-percha points and the sealers CRCS and Endofill (a Grossman cement. After post space preparation, the remainder of the filling was protected or not with 1mm of a plug of the following materials: Coltosol, Super Bonder (cyanoacrylate-ester, CRCS and Endofill. After 24 hours in saline, the specimens were immersed in a 2% methylene blue solution in a vacuum environment for 24 hours. The teeth were then sectioned longitudinally, leakage was evaluated linearly and the obtained data were submitted to the Kruskal-Wallis test. The results with the two sealers studied were similar between themselves and worse (pO objetivo deste trabalho foi avaliar "in vitro" a infiltração marginal coronária após obturação de canal e preparo para pino, empregando-se ou não um "plug" protetor. Cem dentes humanos unirradiculares extraídos tiveram suas coroas removidas, e os canais preparados biomecanicamente e obturados pela técnica da condensação lateral com cones de guta-percha e os cimentos CRCS e Endofill. Após preparo para pino, os remanescentes das obturações foram ou não protegidos por 1 mm de um "plug" dos seguintes materiais: Coltosol, Super Bonder, CRCS e Endofill. Após permanecerem 24 horas em soro fisiológico, os espécimes foram imersos em solução de azul de metileno a 2%, em ambiente com vácuo, por 24 horas. Os dentes foram então seccionados longitudinalmente, as infiltrações marginais mensuradas linearmente, e os dados obtidos submetidos à análise de variância e teste de Kruskal-Wallis. Os resultados com os 2 cimentos estudados foram semelhantes entre si e piores (ñ<0,01 do que os grupos com "plugs" protetores. A análise estatística ordenou os grupos

  14. El uso y transporte del agua en la Fábrica Papelera de Peña Pobre. Un estudio de Arqueología Industrial

    Directory of Open Access Journals (Sweden)

    Sinhúe Lucas Landgrave

    2012-09-01

    Full Text Available Los recursos acuíferos de la zona sur del valle de México tuvieron una importante repercusión en las tempranas industrias del país que se situaron en esta vasta región delimitada naturalmente por a las serranías colindantes, esta zona fue uno de los principales protagonistas junto con algunas partes del estado de Puebla del toque de la industrialización tan anhelado para nuestro país. Muchas empresas tanto papeleras como aquellas destinadas a la producción de textiles encontraron en esta región las cantidades suficientes de agua para sus respectivos procesos productivos que así lo demandaban. Es por ello que dicha parte sureña que actualmente ocupa el Distrito Federal fue muy atractiva en términos de recursos naturales como lo son el abastecimiento de agua, producto de las escorrentías de los cerros, varios ríos tanto de corrientes permanentes como de temporal, la cercanía de diversos manantiales que existieron y algunos que aún existen en la región. Aunado a estas características, existió una nutrida fuente de recursos madereros provenientes de las zonas serranas pertenecientes a los bosques del Ajusco y demás sistemas montañosos colindantes en donde es común la presencia de Pino, Cedro y Oyamel, lo que constituyó el escenario propicio que dio la oportunidad de fincar estas factorías, y lo que es más importante aún, garantizar su crecimiento. Dicho escenario natural fue el lugar propicio para que la Fábrica Papelera de Peña Pobre, se asentara en el siglo XIX. Este Artículo presenta un estúdio de Arqueología Industrial.

  15. Il dono del racconto

    DEFF Research Database (Denmark)

    Polito, Paola

    1998-01-01

    L'articolo indaga a vari livelli strutturali del romanzo "Il coraggio del pettirosso" (rete metaforica, dialogismo diegetico, dialogismo come fenomeno di voce, strategie discorsive messe in atto dalla voce narrante, stile colloquiale) la complessa realizzazione testuale del genere narrativo...

  16. del cambio

    Directory of Open Access Journals (Sweden)

    Alejandro Canales

    2006-01-01

    Full Text Available El artículo analiza las propuestas y los compromisos en materia de cobertura y de financiamiento en el periodo 2000-2006. En particular, revisa las modificaciones y los ajustes de los tres principales documentos en los que se expresaron las iniciativas: el de la Asociación Nacional de Universidades e Instituciones de Educación Superior, el del equipo de la transición y el programa sectorial. Los resultados muestran que las cifras de atención a la demanda educativa e inversión quedaron lejos de las metas autoimpuestas por el gobierno federal y que será necesario realizar mayores esfuerzos para atender tales desafíos.

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

    Directory of Open Access Journals (Sweden)

    Ulises Aguilera-Reyes

    2013-03-01

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

  18. Sampling necrophagous and predatory insects using different lures in a Mexican pine forest Muestreo de insectos necrófagos y depredadores utilizando diferentes cebos en un bosque de pino en México

    Directory of Open Access Journals (Sweden)

    Gerardo Sánchez-Rojas

    2011-09-01

    Full Text Available Sampling with a single bait as a lure is a commonly used practice in studies of necrophilous insect communities. Here, we determined if there were differences in necrophilous insect species richness and abundance when attracted to 4 types of carrion: squid, bird, lizard, and mouse. A comparison between necrophagous and predatory insects was also made to detect whether they differ in their abundance, depending on the bait used. Thirteen species of Silphidae, Staphylinidae (Coleoptera, Calliphoridae, and Sarcophagidae (Diptera were collected in the baited traps; no single bait was able to attract all species. The abundances of 5 species varied significantly depending on the type of bait used. Predatory insects were less abundant than necrophagous insects in lizard and mouse baits. These results show that an evaluation of the structure of a necrophilous insect community can depend on the bait used for sampling.La utilización de un solo tipo de cebo es una práctica común en los estudios de comunidades de insectos necrófilos. En este trabajo determinamos si existen diferencias en la riqueza y abundancia de especies de insectos necrófilos atraídos a 4 tipos de carroña: calamar, ave, lagartija y ratón. También se determinó si la abundancia de insectos necrófagos y depredadores difiere dependiendo del tipo de cebo que se utilice. Se recolectaron 13 especies de Silphidae, Staphylinidae (Coleoptera, Calliphoridae y Sarcophagidae (Diptera; ningún tipo de cebo logró atraer a todas las especies. Se encontró que la abundancia de 5 de las especies difirió significativamente dependiendo del cebo utilizado. La abundancia de los insectos depredadores fue menor que la de los carroñeros en los cebos de lagartija y ratón. Estos resultados muestran que la evaluación de la estructura de una comunidad de insectos necrófilos puede depender del tipo de cebo que se utilice.

  19. Investigation on the variation of annual ring thicknesses and word densities in South African Pinus radiata stands under the influence of climate and different thinning measures by means of radiodensitometry

    International Nuclear Information System (INIS)

    Bues, C.T.

    1984-01-01

    The present work investigates three phenomena of growth biology in Pinus radiata stands: In the first investigation project: the thickness of the annual rings in relation to climate factors; In the second project: the variability of annual ring thickness and wood density as a function of different thinning measures; In the third project the variability of wood density within a Pinus radiate stand is analyzed. To determine the thickness of the annual rings and the wood density values within the annual rings, the method of radiodensitometry, developed during the last decade, is adopted: In the first investigation project the thicknesses of 800 annual rings are determined, in the second project 3808 annual ring structures are investigated, and in the third project 2000 annual rings are evaluated for their density characteristics. (orig./MG) [de

  20. La superaci??n del modelo del ??ngel del hogar:

    OpenAIRE

    Hurtado Mu??oz, M??nica

    2012-01-01

    La Tesis Doctoral titulada "La superaci??n del modelo del "??ngel del hogar". Recuperaci??n de la escritora Leonor Canalejas y Fustegueras (1869-1945)" aborda, en primer lugar, un an??lisis sociol??gico de las circunstancias que rodearon a la mujer espa??ola en el cambio de siglo en el ??mbito social y educativo, en un intento de esclarecer las caracter??sticas propias del contexto en el que la mujer accede a la intelectualidad en general y a la literatura en particular. Esta parte concluye q...

  1. Oviposition Behavior and Survival of Tamarixia radiata (Hymenoptera: Eulophidae), an Ectoparasitoid of the Asian Citrus Psyllid, Diaphorina citri (Hemiptera: Liviidae), on Hosts Exposed to an Entomopathogenic Fungus, Isaria fumosorosea (Hypocreales: Cordycipitaceae), Under Laboratory Conditions.

    Science.gov (United States)

    Chow, Andrew; Dunlap, Christopher A; Jackson, Mark A; Flores, Daniel; Patt, Joseph M; Sétamou, Mamoudou

    2016-10-01

    Antagonistic interactions between the nymphal parasitoid, Tamarixia radiata Waterston (Hymenoptera: Eulophidae), and the ARSEF 3581 strain of the entomopathogenic fungus, Isaria fumosorosea Wize (Hypocreales: Cordycipitaceae), could disrupt biological control of the Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae). Three interactions were evaluated under laboratory conditions at 25 °C: 1) parasitoid survival if parasitized hosts were exposed to ARSEF 3581 blastospores before or after host mummification; 2) parasitoid survival if mummies containing larva or pupa were exposed to ARSEF 3581 hyphae; 3) parasitoid oviposition on infected hosts with visible or without visible hyphae. Topical application of blastospore formulation onto the dorsal surfaces of live nymphs parasitized with second-instar wasp larva (3 d after parasitism) reduced host mummification by 50% and parasitoid emergence by 85%. However, parasitoid emergence was not affected by topical application of blastospore formulation onto mummies that contained fourth-instar wasp larva (6 d after parasitism). Parasitoid emergence was reduced by 80% if mummies containing fourth-instar wasp larva were covered with blastospore formulation colonized by fungal hyphae. In comparison, parasitoid emergence was not affected if mummies containing wasp pupa (9 d after parasitism) were covered with formulation colonized by fungal hyphae. Female parasitoids oviposited on infected hosts without visible hyphae but not on infected hosts with visible hyphae. Our findings suggest that I. fumosorosea could detrimentally affect T. radiata, if both natural enemies are simultaneously deployed for biological control of D. citri However, temporal separation of the fungus and parasitoid could reduce antagonism and enhance control of D. citri. © The Authors 2016. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  2. Effect of tillage and crop residues management on mungbean (vigna radiata (L.) wilczek) crop yield, nitrogen fixation and water use efficiency in rainfed areas

    International Nuclear Information System (INIS)

    Mohammad, W.; Shehzadi, S.; Shah, S.M.; Shah, Z.

    2010-01-01

    A field experiment was conducted to study the effect of crop residues and tillage practices on BNF, WUE and yield of mungbean (Vigna radiata (L.) Wilczek) under semi arid rainfed conditions at the Livestock Research Station, Surezai, Peshawar in North West Frontier Province (NWFP) of Pakistan. The experiment comprised of two tillage i) conventional tillage (T1) and ii) no-tillage (T0) and two residues i) wheat crop residues retained (+) and ii) wheat crop residues removed (-) treatments. Basal doses of N at the rate of 20: P at the rate of 60 kg ha-1 were applied to mungbean at sowing time in the form of urea and single super phosphate respectively. Labelled urea having 5% 15N atom excess was applied at the rate of 20 kg N ha-1 as aqueous solution in micro plots (1m2) in each treatment plot to assess BNF by mungbean. Similarly, maize and sorghum were grown as reference crops and were fertilized with 15N labelled urea as aqueous solution having 1% 15N atom excess at the rate of 90 kg N ha/sup -1/. The results obtained showed that mungbean yield (grain/straw) and WUE were improved in notillage treatment as compared to tillage treatment. Maximum mungbean grain yield (1224 kg ha/sup -1/) and WUE (6.61kg ha/sup -1 mm/sup -1/) were obtained in no-tillage (+ residues) treatment. The N concentration in mungbean straw and grain was not significantly influenced by tillage or crop residue treatments. The amount of fertilizer-N taken up by straw and grain of mungbean was higher under no-tillage with residues-retained treatment but the differences were not significant. The major proportion of N (60.03 to 76.51%) was derived by mungbean crop from atmospheric N2 fixation, the remaining (19.6 to 35.91%) was taken up from the soil and a small proportion (3.89 to 5.89%) was derived from the applied fertilizer in different treatments. The maximum amount of N fixed by mungbean (82.59 kg ha/sup -1/) was derived in no-tillage with wheat residue-retained treatment. By using sorghum as

  3. Effects of vibration on stone pine trees (Pinus pinea L.) on the vigor of the trees: crown density, growth shoots and parasites of weak trees.; Efectos del vibrado del pino pinonero (Pinus pinea L.) en el vigor de los arboles: densidad de copa, crecimiento de guias y parasitos de debilidad

    Energy Technology Data Exchange (ETDEWEB)

    Martinez-Zurimendi, P.; Alvarez, J. M.; Pando, V.; Dominguez, M.; Gordo, J.; Finat, L.; Sierra-De-Grado, R.

    2009-07-01

    In the northwest of Spain the mechanized harvesting of pine cones is more and more frequent. In order to quantify the effects of vibration on the vigor of the trees, parcels of stone pine were planted in plateau and countryside. Both the mechanized and manual harvests were analyzed in adult and young trees. The growth of the tree shoots was measured. The presence and abundance of three insect plagues was analyzed in those same trees: Tacoma's piniperda, Rhyacionia buoliana and Thaumetopoea pityocampa. The average shoot length of those trees manually harvested was superior to that of those mechanically harvested. The difference was very significant in young trees (40-50 years old) in the countryside and in adult trees (more than 80 years) on the plateau. Rhyacionia buoliana was more abundant in adult trees that young trees, but the relation of its abundance with the harvest method was not seen. The presence of Tomicus piniperda was rare and was only detected in mechanically harvested stands. Thaumetopoea pityocampa was more frequent in trees harvested by hand than those harvested mechanically and was more abundant in young stands. The percentage tree of defoliation was low in all stands independent of harvest method. (Author) 45 refs.

  4. Using fecal profiles of bile acids to assess habitat use by threatened carnivores in the Maulino forest of central Chile Empleo del perfil de ácidos biliares fecales para evaluar uso del hábitat por carnívoros amenazados en el bosque maulino de Chile central

    Directory of Open Access Journals (Sweden)

    CARLA GUERRERO

    2006-03-01

    central: Galictis cuja, Oncifelis guigna, Pseudalopex culpaeus, Pseudalopex griseus y Puma concolor. Los perfiles de ácidos biliares fecales, establecidos mediante cromatografía de capa fina, resultaron ser especie-específicos, invariantes tanto dentro de muestras de un mismo individuo como entre muestras de diferentes individuos de una misma especie, pero son consistentemente diferentes entre especies. La distribución especial de fecas en áreas de bosque nativo y plantaciones de pino en el bosque costero del Maule se comparó con la distribución esperada en base a estudios previos basados en registro de huellas. Pseudalopex culpaeus usa extensamente plantaciones de pino; Oncifelis guigna prefiere bosque nativo y Pseudalopex griseus usa bosque nativo y plantaciones de pino en proporción a su disponibilidad. Los resultados de la distribución de fecas son similares a los obtenidos por registro de huellas

  5. Acerca del moho

    Science.gov (United States)

    El moho forma parte del medio ambiente natural. Afuera del hogar, el moho juega un papel en la naturaleza al desintegrar materias organicas tales como las hojas que se han caido o los arboles muertos. El moho puede crecer adentro del hogar cuando las espor

  6. Del bit al qubit

    OpenAIRE

    Torras Font, Josep

    2011-01-01

    Aquest document pretén donar una visió del desenvolupament dels computadors electrònics i dels components que els han fet possibles. Dintre de les opcions de futur en computació, també intenta donar una visió de les bases en que es fonamenta la computació quàntica.

  7. Algunas aclaraciones acerca del conocimiento del singular.

    Directory of Open Access Journals (Sweden)

    Carlos Llano Cifuentes

    2013-11-01

    Full Text Available Llano tries to explain the main purpose of El Conocimiento del Singular, showing how the individuals about which the book is concerned are basically human individuals: people as decision makers.

  8. Balanceo de un sistema de cosecha mecanizado utilizando simulación de eventos discretos.

    Directory of Open Access Journals (Sweden)

    Pablo Aracena

    2010-08-01

    Full Text Available Se analizó un sistema de cosecha mecanizado, operando en una faena a tala rasa de pino radiata y conformado por un feller buncher, un skidder con garra, un procesador y un trineumático. Un Modelo de Simulación de Eventos Discretos (MSED fue desarrollado con el propósito de balancear el sistema. El proceso mecanizado de madera fue el limitante del sistema de acuerdo con los resultados del estudio de tiempos, entonces este proceso fue apoyado agregando a 3 operadores de motosierra para alcanzar una producción de 60,82 m3/Hora-Máquina (HM en la configuración propuesta. Simulado el madereo se determinó que para balancear la producción obtenida en proceso, el skidder con garra debía operar a una distancia promedio de madereo (DPM de 80 m, realizando una detención para completar una carga de cuatro fustes. Finalmente, el feller buncher puede usar hasta 1,6 minutos adicionales para formar las pilas que permitan lograr la producción esperada para el sistema. De acuerdo con la experimentación de simulación se podría lograr una producción del sistema de 60,39 m3/HM, si todas las modificaciones propuestas en volteo, apilado, madereo y proceso son realizadas.

  9. Immunohistochemical localization of CYP1A, vitellogenin and Zona radiata proteins in the liver of swordfish (Xiphias gladius L.) taken from the Mediterranean Sea, South Atlantic, South Western Indian and Central North Pacific Oceans

    International Nuclear Information System (INIS)

    Desantis, S.; Corriero, A.; Cirillo, F.; Deflorio, M.; Brill, R.; Griffiths, M.; Lopata, A.L.; Serna, J.M. de la; Bridges, C.R.; Kime, D.E.; De Metrio, G.

    2005-01-01

    Cytochrome P4501A (CYP1A) monoxygenase, vitellogenin (Vtg) and Zona radiata proteins (Zrp) are frequently used as biomarkers of fish exposure to organic contaminants. In this work, swordfish liver sections obtained from the Mediterranean Sea, the South African coasts (South Atlantic and South Western Indian Oceans) and the Central North Pacific Ocean were immunostained with antisera against CYP1A, Zrp, and Vtg. CYP1A induction was found in hepatocytes, epithelium of the biliary ductus and the endothelium of large blood vessels of fish from the Mediterranean Sea and South African waters, but not from the Pacific Ocean. Zrp and Vtg were immunolocalized in hepatocytes of male swordfish from the Mediterranean Sea and from South African waters. Plasma Dot-Blot analysis, performed in Mediterranean and Pacific specimens, revealed the presence of Zrp and Vtg in males from Mediterranean but not from Pacific. These results confirm previous findings about the potential exposure of Mediterranean swordfish to endocrine, disrupting chemicals and raise questions concerning the possible presence of xenobiotic contaminants off the Southern coasts of South Africa in both the South Atlantic and South Western Indian Oceans

  10. Involvement of abscisic acid in regulating antioxidative defense systems and IAA-oxidase activity and improving adventitious rooting in mung bean [Vigna radiata (L.) Wilczek] seedlings under cadmium stress.

    Science.gov (United States)

    Li, Shi-Weng; Leng, Yan; Feng, Lin; Zeng, Xiao-Ying

    2014-01-01

    In vitro experiments were conducted to investigate the effects of abscisic acid (ABA) and Cd on antioxidative defense systems and indole-3-acetic acid (IAA) oxidase during adventitious rooting in mung bean [Vigna radiata (L.) Wilczek] seedlings. The exogenous ABA significantly enhanced the number and fresh weight of the adventitious roots. CdCl2 strongly inhibited adventitious rooting. Pretreatment with 10 μM ABA clearly alleviated the inhibitory effect of Cd on rooting. ABA significantly reduced superoxide dismutase (SOD), ascorbate peroxidase (APX), peroxidase (POD), and catalase (CAT) activities, as well as the levels of glutathione (GSH) and ascorbic acid (ASA) during adventitious rooting. ABA strongly increased IAA-oxidase activity during the induction (0-12 h) and expression (after 48 h) phases and increased the phenols levels. Cd treatment significantly reduced the activities of SOD, APX, POD, and IAA oxidase, as well as GSH level. Cd strongly increased ASA levels. ABA pretreatment counteracted Cd-induced alterations of certain antioxidants and antioxidative enzymes, e.g., remarkably rescued APX and POD activities, reduced the elevated SOD and CAT activities and ASA levels, and recovered the reduced GSH levels, caused by Cd stress. Thus, the physiological effects of the combination of ABA and Cd treatments were opposite of those obtained with Cd treatment alone, suggesting that ABA involved in the regulation of antioxidative defense systems and the alleviation of wounding- and Cd-induced oxidative stress.

  11. Competencia morfogénica de embriones maduros de Pinus radiata cultivados in vitro y su relación con la posición del cono en el árbol

    OpenAIRE

    Sánchez-Olate, Manuel; Zapata Valenzuela, Jaime; Sáez Delgado, Patricia; Ríos Leal, Darcy; Spiercolli Henríquez, Scarlette; Alvarez Maldini, Carolina; Delaveau, Catherine; Pereira Cancino, Guillermo

    2008-01-01

    La micropropagación de material embrionario colectado de árboles adultos constituye una alternativa importante en la propagación masiva de fenotipos selectos, adecuados para los programas de clonación implementados por las empresas forestales. Utilizando esta técnica, ejes embrionarios maduros extraídos desde conos lignificados ubicados a diferentes alturas en el árbol (zonas basal, media y apical) fueron introducidos in vitro con el objeto de analizar la posible relación entre el estado fisi...

  12. Psicodrama del duelo.

    OpenAIRE

    José Antonio Espina Barrio; Marisol Filgueira Bouza

    1997-01-01

    La pérdida de rituales agrava y alarga la reacción del duelo. Se define el Psicodrama Antropológico y su intervención en el proceso del duelo. El Psicodrama Focal del Duelo es una psicoterapia breve centrada en el proceso de Duelo. Se comentan varios casos y resultados. Se concluye con un programa sencillo para el duelo en Atención Primaria.

  13. Fractura triple del complejo suspensorio del hombro

    Directory of Open Access Journals (Sweden)

    Eraclio Delgado Rifá

    2015-06-01

    Full Text Available El complejo suspensorio del hombro es una estructura sumamente importante, compuesta por un anillo de huesos y tejidos blandos. Las lesiones aisladas de este complejo anatómico son frecuentes y no afectan su estabilidad. La interrupción doble conduce a la inestabilidad de esta estructura y usualmente requiere tratamiento quirúrgico. La triple interrupción, por su parte, es sumamente rara y es encontrada en casos de trauma de alta energía a menudo en asociación con otras lesiones. Se presenta una triple lesión del complejo suspensorio del hombro en un paciente de 46 años de edad, con una fractura de la glenoides, del acromion tipo III de Kuhn y de la coracoides tipo II de Ogawa. En este caso, la fractura del acromion fue tratada con fijación percutánea con alambres de Kirschner, por tener asociado lesiones de partes blandas que contraindicaron la reducción abierta. La fractura de la glenoides y de la apófisis coracoides fueron tratadas conservadoramente. Después de 6 meses de evolución, el paciente tuvo un resultado funcional aceptable, con una abducción de 90 grados, los 30 grados de rotación externa y 70 de rotación interna, además asintomático y consolidación de todas las fracturas. A pesar de ser catalogada de una lesión grave del cinturón escapular y estar asociada a otras lesiones se obtuvo un resultado satisfactorio al final del tratamiento.

  14. Vigencia del Darwinismo

    OpenAIRE

    Lessa, Enrique P

    2009-01-01

    En este ensayo se presenta una revisión histórica del signifcado y legado del darwinismo, con énfasis en el último siglo. La principal conclusión es que la visión darwiniana de la evolución, con las modifcaciones requeridas para dar cuenta de los grandes desarrollos de la disciplina, se ha impuesto y mantiene vigencia en nuestros días. En particular, el papel del azar, la evolución como proceso de “descendencia con modifcación” a lo largo de diversas ramas del árbol de la vida, el pensamiento...

  15. Deslignificación de pasta kraft de Pinus radiata con una levadura genéticamente modificada para producir lacasa

    OpenAIRE

    Arana-Cuenca, A.; Yagüe, Susana; Fermiñán, Encarnación

    2010-01-01

    Una posible aplicación biotecnológica de las lacasas fúngicas es el blanqueo de pasta de papel mediante la degradación de la lignina en la pasta cruda. Para ello es necesaria su producción a bajo coste y a concentraciones superiores a las secretadas por los hongos de forma natural. La expresión heteróloga en levaduras es una alternativa para su producción a mayor escala. En el presente trabajo se ha realizado la expresión heteróloga del gen cglcc1, responsable de la producción de lacasa en el...

  16. La luz del origen del universo

    Directory of Open Access Journals (Sweden)

    Casas, Alberto

    2015-10-01

    Full Text Available Penzias and Wilson discovered the cosmic microwave background, a luminous echo of the Big Bang, in 1965. The amount of information encoded in this relic of the early universe is truly extraordinary. At present, the most precise data about the origin and structure of the universe comes from the study of this primordial light, the full potential of which has yet to be explored.En 1965 se descubrió el fondo de radiación de microondas, un eco luminoso de la Gran Explosión (Big Bang. La cantidad de información contenida en esta reliquia del universo primitivo es verdaderamente extraordinaria. En la actualidad los datos más precisos sobre el origen y estructura del universo provienen del estudio de esta luz primigenia, que aún no ha sido explorada en todo su potencial.

  17. Estimación de la densidad de la madera aserrada de conífera mediante técnicas no destructivas de arranque de tornillos y penetrómetro y su aplicación en la estimación del módulo de elasticidad

    Directory of Open Access Journals (Sweden)

    Palacios Monteagudo, José

    2007-06-01

    Full Text Available The results of probing 395 sawn pieces of Radiata pine (Pinus radiata D. Don, Scots pine (Pinus sylvestris L. and Laricio pine (Pinus nigra Arn. ssp. salzmannii from Spanish sources are presented. Specimens had a cross section from 150 x 200 mm, 150 x 250 mm, and 200 x 250 mm. The Screw Withdrawal Force Meter (SWFM developed by the Wood NDT Laboratory of the University of Western Hungary, in Sopron, and the Pilodyn 6J Wood Tester by Proceq, are the items of equipment used to measure screw withdrawal force and penetration depth, respectively. Based on our results, this paper concludes that for structural coniferous timber the density values estimated from probing measurements are reliable. There is a positive correlation between non-destructive parameters and density (a coefficient of determination r2 of 48.5% to 49.9% is obtained. The authors believe that it is possible to use probing with ultrasonic methods as a good combined nondestructive technique to improve the results of visual grading and modulus of elasticity assessment, at least as an additional parameter in structural sawn timber.Se han efectuado medidas indirectas de la densidad de la madera mediante métodos no destructivos, como la penetración de una varilla con penetrómetro o el arranque de tornillos, sobre probetas procedentes de 395 vigas de tamaño estructural de Pinus radiata D. Don (155, Pinus sylvestris L (120, y Pinus nigra Arn (120. El objeto es tratar de establecer una metodología, para la estimación en obra de la densidad, cuando se realizan tareas de mantenimiento, rehabilitación o restauración. Se han obtenido relaciones estadísticamente significativas entre los valores obtenidos en los ensayos no destructivos y la densidad real de las piezas. Se proponen tres modelos para la estimación de la densidad basados en el resultado del ensayo no destructivo de arranque de tornillos con coeficientes de determinación (R2 de 48,5%, 49,5% y 49,9%. Por ultimo, se plantea

  18. Archivo del Duelo

    OpenAIRE

    Ferrera, Tamara

    2010-01-01

    Photos taken from the Archive of Mourning following the March 11 terrorist attacks El Archivo del Duelo. Creación de un archivo etnográfico de los Atentados del 11 de marzo en Madrid. Ministerio de Educación y Ciencia HUM2005-03490.

  19. Displasias del seno

    Directory of Open Access Journals (Sweden)

    Ernesto Andrade Valderrama

    1971-04-01

    Full Text Available En general, las Displasias no se presentan antes de la iniciación del estímulo Gonadal y tienden a desaparecer con el climaterio. Se definen entonces como las afecciones benignas del Seno, de origen endocrino.

  20. Diversidad y abundancia de macroinvertebrados acuáticos y calidad del agua de las cuencas alta y baja del río Gariché, provincia de Chiriquí, Panamá

    Directory of Open Access Journals (Sweden)

    Tomás Ríos

    2013-08-01

    Full Text Available Se determinaron la diversidad y abundancia de macroinvertebrados acuáticos, así como la calidad del agua,en cuatro estaciones de muestreo ubicadas en las subcuencas alta y baja del río Gariché, durante la época seca (eneroa abril y lluviosa (julio a octubre de 2010, utilizando los métodos descritos por Pino & Bernal (2009. Se identifi caronun total de 4 964 individuos, pertenecientes a 50 géneros, 30 familias y nueve órdenes de la clase Insecta. El índicede diversidad de Shannon-Weaver en promedio para la época seca fue de 2.36 y en época lluviosa de 1.95, esdecir, una diversidad media en este ecosistema. En época seca, la abundancia de individuos fue mayor en el ordenHemiptera, familia Veliidae y el género Rhagovelia, seguido del orden Trichoptera, familia Hydroptilidae y el géneroAtanatolica. En época lluviosa, los órdenes más representativos fueron Ephemeroptera, familia Leptophlebiidae y elgénero Thraulodes, seguido de Hemiptera, familia Veliidae y el género Rhagovelia. El índice de Jaccard indicó que lasestaciones con mayor similitud fueron la 1 y 2, con un 65.2 % (época seca y 76.9 % (época lluviosa, mientras que lasimilitud fue baja en las estaciones 1 y 3, con un 33.3 % (época seca y un 41.7 % (época lluviosa. El índice bióticoBMWP´/PAN para la época seca y lluviosa, mostró para las estaciones 1 y 2 aguas de calidad regular, pero en lasestaciones 3 y 4 las aguas son de calidad aceptable. Las variables físicas y químicas mostraron valores dentro de loslímites aceptables durante la época seca, mientras que en la época lluviosa los niveles fueron bajos, de acuerdo con losvalores establecidos por las normas primarias de calidad ambiental y niveles de calidad para las aguas continentalesde uso recreativo con y sin contacto directo, infl uyendo en la heterogeneidad de los macroinvertebrados acuáticosencontrados en cada estación de muestreo.

  1. La crisi del diritto del lavoro

    Directory of Open Access Journals (Sweden)

    Alessandro Garilli

    2012-01-01

    Full Text Available Riassunto - L’Autore ripercorre in chiave critica l’evoluzione delle politiche legislative in materia di lavoro, alla luce dell’attuale fase di crisi economico finanziaria. Nell’esaminare i principali interventi normativi attuati da inizio secolo, l’Autore mette in evidenza le scelte di metodo e gli elementi di continuità che accomunano i vari provvedimenti, individuandoli nell’affannosa ricerca del punto di equilibrio tra flessibilità e garantismo. La riflessione si chiude con alcuni interrogativi sulle ultime linee di riforma del mercato del lavoro e con l’auspicio che, anche al cospetto delle imprescindibili ragioni dell’economia, il diritto del lavoro possa continuare a svolgere il proprio tradizionale ruolo di disciplina di tutela della persona.   Abstract - The author analyzes, with a critically oriented approach, the development of the employment law, in the light of the current economic and financial crisis. In examining the main regulatory measures implemented since the beginning of the century, the author highlights the methodological choices and the elements of continuity that unite the various measures, focusing them in a hard research of a point of balance between flexibility and security. The discussion concludes with some questions about the last lines of the reform of the labor market and with the hope that, even in the face of compelling reasons of economy, labor law can continue to play its traditional role of governing the protection of person.

  2. OBJETIVO DEL DESARROLLO DEL MILENIO 7

    Directory of Open Access Journals (Sweden)

    Margarita M. Pérez O.

    2013-10-01

    Full Text Available Los Objetivos de Desarrollo del Milenio, también conocidos como los Objetivos del Milenio, constituyeron las metas finales que aprobaron los dirigentes mundiales, 189 jefes de estado y de gobierno en la Cumbre del Milenio de las Naciones Unidas celebrada en Nueva York en el año 2000, en la cual los Estados miembros de la organización reafirmaron su compromiso de luchar por un mundo en el que el desarrollo sostenible y la eliminación de la pobreza tuvieran máxima prioridad1 . En la cumbre se definió la Declaración del Milenio, la cual detalla los objetivos, principios, valores, metas y acciones para erradicar la pobreza Mundial hacia el año 2015, todos ellos ratificados con alto interés y acción estratégica de carácter global, como marco para la medición de los progresos en materia de desarrollo.

  3. Elementos del sistema electoral del Congreso Mexicano

    Directory of Open Access Journals (Sweden)

    Aldo Medina García

    2013-08-01

    Full Text Available El presente artículo es un estudio de los componentes del sistema electoral, diseñado por el legislador mexicano para integrar al parlamento federal. Estudio desarrollado a sabiendas de la importancia que reviste el sistema electoral como un medio que permite a los ciudadanos convertir su voto expresado en las urnas en escaños a favor de determinado candidato o partido. En dicho análisis tomamos en cuenta la evolución constitucional del sistema electoral mexicano, la participación de las fuerzas minoritarias en la integración del Senado y de la Cámara de Diputados, la división que se hace del territorio en circunscripciones electorales, la barrera electoral que se fija a los partidos políticos para acceder a la representación en el Parlamento, la fórmula de asignación que se aplica a la votación obtenida, para finalmente concluir que el sistema electoral mexicano es esencialmente mayoritario aun cuando se vista de proporcional.

  4. Tere tulemast uude sõtta / Jüri Pino

    Index Scriptorium Estoniae

    Pino, Jüri, 1970-

    2011-01-01

    14. aprillil toimunud NATO välisministrite kohtumisel viitas USA riigisekretär Hillary Clinton võimalusele, et Liibüasse tuleb ka maaväed sisse viia. Autor leiab, et see tähendab ka Eestile uue sõja algust

  5. Caratterizzazione di pannelli x-lam in pino marittimo sardo

    OpenAIRE

    Riu, Riccardo

    2016-01-01

    Background and Purpose: The aim of this work is to present the idea of a short procurement chain of timber as a means to provide an increased value to Sardinian forests. It is based on the evidence that timber buildings are increasingly useful for a number of reasons including sustainability, the speed of erection, and excellent structural performance. However, most of the timber currently used in Sardinia is imported from outside this area. The idea is to use the best part of locally-grown t...

  6. Actinobacteria Associated With Arbuscular Mycorrhizal Funneliformis mosseae Spores, Taxonomic Characterization and Their Beneficial Traits to Plants: Evidence Obtained From Mung Bean (Vigna radiata) and Thai Jasmine Rice (Oryza sativa)

    Science.gov (United States)

    Lasudee, Krisana; Tokuyama, Shinji; Lumyong, Saisamorn; Pathom-aree, Wasu

    2018-01-01

    In this study, we report on the isolation of actinobacteria obtained from spores of Funneliformis mosseae and provide evidence for their potential in agricultural uses as plant growth promoters in vitro and in vivo. Actinobacteria were isolated from spores of F. mosseae using the dilution plate technique and media designed for the selective isolation of members of specific actinobacterial taxa. Six strains namely 48, S1, S3, S4, S4-1 and SP, were isolated and identified based on16S rRNA gene sequences. Phylogenetic analysis showed that isolate SP belonged to the genus Pseudonocardia with P. nantongensis KLBMP 1282T as its closest neighbor. The remaining isolates belonged to the genus Streptomyces. Two isolates, 48 and S3 were most closely related to S. thermocarboxydus DSM 44293T. Isolates S4 and S4-1 shared the highest 16S RNA gene similarity with S. pilosus NBRC 127772T. Isolate S1 showed its closest relationship with the type strain of S. spinoverrucosus NBRC14228T. The ability of these isolates to produce indole-3-acetic acid (IAA), siderophores and the ability to solubilize phosphate in vitro were examined. All isolates produced siderophores, four isolates produced IAA and two isolates solubilized inorganic phosphate at varying levels. S. thermocarboxydus isolate S3 showed the highest IAA production with high activities of phosphate solubilization and siderophore production. The inoculation of mung beans (Vigna radiata) with this strain resulted in a significant increase in fresh weight, root length and total length as an effect of IAA production. In an experiment with rice (Oryza sativa), S. thermocarboxydus isolate S3 promoted the growth of rice plants grown in low nutritional soil under induced drought stress. This report supports the view that the inoculation of rice with plant growth promoting actinobacteria mitigates some adverse effects of low nutrient and drought stress on rice. PMID:29942292

  7. Evaluation of fracture resistance of endodontically treated teeth restored with prefabricated posts and composites with varying quantities of remaining coronal tooth structure Avaliação da resistência à fratura de dentes tratados endodonticamente restaurados com pinos pré-fabricados e resinas compostas variando o remanescente dentário coronal

    Directory of Open Access Journals (Sweden)

    Murilo Pereira de Melo

    2005-06-01

    Full Text Available OBJECTIVES: The aim of this study was to evaluate the influence of remaining coronal tooth structure on endodontically treated teeth restored with prefabricated posts and two different composites for core build-up: dual-cured resin (Enforce Core and light-cured resin (Z-250. METHODS: Fourty freshly extracted canines were endodontically treated and divided into four groups: Group I - teeth with 3mm remaining coronal structure, restored with Enforce Core; Group II - teeth with 3mm remaining coronal structure, restored with Z-250; Group III - teeth with no remaining coronal structure, restored with Enforce; Group IV - teeth with no remaining coronal structure, restored with Z-250. After restoration, the teeth were embedded in acrylic resin and the fracture resistance was measured on a universal testing machine at 45 degrees to the long axis of the tooth until failure. RESULTS: Data were analyzed by two-way analysis of variance, which showed significant differences between groups (p=0.00. The Tukey test did not show significant differences between specimens with and without remaining coronal structure. Conversely, significant difference was observed between groups with different core build-up. The highest values of fracture resistance were found in the group restored with light-cured resin. SIGNIFICANCE: The remaining coronal tooth structure did not influence the resistance of endodontically treated teeth; however, the change of core build-up was able to modify this resistence.O objetivo desta pesquisa foi avaliar a influência do remanescente dentário coronal de dentes tratados endodonticamente, restaurados com pinos pré-fabricados e duas resinas como núcleos de preenchimento, uma de presa dual (Enforce Core e outra fotopolimerizável (Z-250. Foram utilizados 40 caninos superiores humanos extraídos, divididos em quatro grupos de 10 espécimes: Grupo l - com remanescente dentário coronal de 3mm e restaurados com Enforce Core; Grupo ll - com

  8. Desempenho físico-químico de filmes hidrofóbicos de AlN e de Ti nanoestruturado crescidos por plasma frio sobre superfícies de isoladores cerâmicos de porcelana tipo pino

    Directory of Open Access Journals (Sweden)

    M. M. Mazur

    2016-03-01

    Full Text Available Resumo A resistência mecânica e a propriedade dielétrica de isoladores cerâmicos são características fundamentais para o suporte das redes de distribuição de energia elétrica. Porém, tanto a umidade quanto o teor de poluentes na atmosfera podem vir a ser prejudiciais e causar falhas na entrega de energia por elevação da sua corrente elétrica de fuga. O vidrado do isolador tem grande afinidade com a água resultante da interação da superfície do vidro com a atmosfera. No presente trabalho, foi realizada a deposição de filmes de nitreto de alumínio sobre o vidrado de amostras de isoladores elétricos cerâmicos, via plasma "magnetron sputtering" pulsado, de corrente contínua, e com uma mistura dos gases argônio e nitrogênio e de Ti sobre isoladores tipo pino para classes de tensão de 15 kV. A morfologia dos filmes e o desempenho dos isoladores foram medidos por MEV-FEG/EDS, AFM, máxima corrente de fuga RMS e grau de hidrofobicidade. O comportamento dos filmes depositados medido pelo grau de hidrofobicidade reduziu nas amostras de CM6 para CM4, com AlN, e de CM7 para CM3 quando foi depositado o Ti. A máxima corrente de fuga RMS medida nos isoladores sem e com filme nanométrico à base de Ti foi superior nos dispositivos sem a proteção, alcançando valores medidos de 5 mA e com desligamento do sistema computadorizado de medida (após 3 dias em Sauípe e 3 meses em Pituba em consequência desta ter superado o intervalo de segurança de curto circuito estabelecido nos dispositivos eletrônicos de proteção (surtos superiores a 300 mA. Com a deposição dos filmes em 7 isoladores, foram verificadas alterações de comportamento em dois destes, com picos de máxima corrente de fuga atingindo 2,4 mA no campo. A maioria dos isoladores analisados teve como variações de correntes de fuga RMS, no período de medida, entre 0,2 e 2 mA, em condições adversas de clima (com chuva e diferentes velocidades de vento.

  9. Castillo del Real. Olocau

    OpenAIRE

    AUÑÓN VALLEJO, JONATAN

    2012-01-01

    El objetivo que se quiere alcanzar con este proyecto es el de realizar un estudio lo más cercano posible del Catillo del Real, de manera que se pueda conocer su origen, su evolución a lo largo de la historia, así como las diferentes técnicas y sistemas constructivos utilizados en su construcción. Auñón Vallejo, J. (2011). Castillo del Real. Olocau. http://hdl.handle.net/10251/14244. Archivo delegado

  10. La Representabilidad del Genocidio

    OpenAIRE

    Cardona González, Lorena

    2012-01-01

    El presente artículo intenta hacer una aproximación histórica y analítica al fenómeno del Genocidio, sus implicaciones sociales y culturales que dieron como resultado la reformulación analítica y conceptual de hechos que hasta entonces superaban el conocimiento y la moral humana. De este modo, se hace un trayecto histórico de la paulatina aparición del asesinato masivo como practica de Estado, enmarcado en las experiencias del genocidio armenio y el alemán. A su vez, se hace una mirada sobre ...

  11. Significado presente del CSIC

    OpenAIRE

    Garrido Gallardo, Miguel Angel

    2000-01-01

    Not available

    Este artículo, elaborado en 1999, ofrece una panorámica de la realidad del Consejo Superior de Investigaciones Científicas en la actualidad. Repasa su organización, su volumen de publicaciones, sus indicadores de productividad, su capacidad de obtener recursos y, en suma, su lugar en el conjunto del sistema español de Ciencia y Tecnología, considerado en sí mismo y en relación con la Universidad. Como conclusión del repaso de datos, se afirma que, aunque la fó...

  12. Tratamiento del pie equino

    OpenAIRE

    Robles, Fernanda

    2012-01-01

    El pie equino varo es una patología frecuente en los pacientes con Encefalopatía crónica no evolutiva (ECNE).Se observó que existe una mayor frecuencia en el sexo masculino. Se realizó un estudio descriptivo, comparativo y secundario, durante el periodo de septiembre del 2006 a septiembre del 2011, con un total de 125 pacientes con Ecne, de los cuales se encontraron 101 con pie equino varo congénito. Objetivo: observar los resultados obtenidos en la rehabilitación del pie equino, en niños de ...

  13. Del Pasadismo al Futurismo

    OpenAIRE

    Agudo-Martínez, M. J.

    2003-01-01

    Uno de los habituales prejuicios a la hora de abordar el análisis del movimiento futurista, al igual que sucede con el constructivismo, es la consideración del contexto político en el que se desarrollaron ambas vanguardias. Sin embargo, y dejando a un lado un enfoque del arte con finalidad política de signo diverso, habría que insistir en el hecho de que posiblemente sean tanto el futurismo italiano como el constructivismo ruso, los movimientos que con mayor entusiasmo se manifestaron, en un ...

  14. Preferencias del Turista

    Directory of Open Access Journals (Sweden)

    Jose Luis Leiva Olivencia

    2015-01-01

    Full Text Available Actualmente existen aplicaciones orientadas al turismo basadas en realidad aumentada, pero no integran técnicas de recomendación. Este articulo describe RAMCAT (Realidad Aumentada Móvil Contextual Aplicada al Turismo un modelo de guía turística, que recomienda puntos de interés, teniendo en cuenta factores como preferencias personales y atributos contextuales. Se presentan los componentes teóricos de la arquitectura propuesta, así como sus características, destacando la integración de diferentes sistemas de recomendación, que permiten añadir nuevos motores en el futuro. El articulo se centra en describir sus funcionalidades y el modulo correspondiente al sistema de recomendación basado en el perfil del turista. Otra característica importante del sistema propuesto es la retroalimentación del mismo mediante calificaciones del turista y su trazabilidad.

  15. Carta del Editor

    Directory of Open Access Journals (Sweden)

    Luis Eladio Proaño

    2015-01-01

    Full Text Available La millonaria contratación del futbolista David Beckham, un fenómeno del mercado, ha provocado cuestionamientos a los que se busca respuesta. Es tema de análisis el por qué el betseller "Harry Potter" ha causado tanta conmoción en la opinión pública. Respecto al periodista cibernético, se señalan los contornos del presente y atisban las posibilidades del futuro de esta nueva profesión. El tratamiento de los mitos de la prensa, los temores de la Ley mordaza venezolana y la brutalidad de los video juegos e Internet son temas de enorme interés. Se comenta las pocas veces que la prensa reflexiona sobre la comunicación corporal y la anorexia.

  16. Los muertos del Floreanismo

    Directory of Open Access Journals (Sweden)

    Enrique Ayala Mora

    2008-06-01

    Full Text Available El artículo analiza el crimen político durante las primeras décadas de vida de la República del Ecuador. Específicamente centra su estudio en el período dominado por la figura de Juan José Flores, primer presidente del Ecuador. La inestabilidad política, la precariedad de las alianzas entre las élites regionales, la crisis económica generada por las guerras de Independencia, las conspiraciones y la violencia que caracterizaron al período de surgimiento de las repúblicas andinas hicieron del crimen político un “vicio de nacimiento”. El asesinato del general Antonio José de Sucre, la muerte de los miembros de la sociedad El Quiteño Libre, el homicidio de Juan Otamendi, entre otros, hicieron patente esta característica.

  17. Niveles del aprendizaje organizacional

    OpenAIRE

    Garzón Castrillón, Manuel Alfonso

    2005-01-01

    En la propuesta de modelo de aprendizaje organizacional (AO), la segunda variable se denomina niveles del aprendizaje organizacional ; los niveles de aprendizaje que contemplamos para nuestra investigación son: individual, de equipo, organizacional e interorganizacional.

  18. La escritura del Yo

    Directory of Open Access Journals (Sweden)

    Patricio Landaeta Mardones

    2013-11-01

    Full Text Available Si la creación de una imagen fidedigna del mundo fue la condición de la conquista cognitiva y económica de la tierra, las imágenes mediáticas circulan hoy en día a la manera de un montaje que organiza los sujetos como elementos de un territorio. En esta presentación abordaremos el cruce entre estos dos hechos, entre la escritura del mundo y la de los sujetos, a partir de la idea de Fabulación para mostrar otra escritura del mundo y del yo, leyendo textos e imágenes de la Primera buena Corónica y Buen Gobierno de Felipe Guaman Poma de Ayala.

  19. Consideraciones alrededor del Libro del Almismo, el Libro del Pensar.

    Directory of Open Access Journals (Sweden)

    MartaLucía Tamayo Fernandez

    1999-12-01

    Full Text Available

    La doctora MarthaLucía Tamayo comparte muchas inquietudes alrededor del Libro del Almismo, el Libro del Pensar; de dónde salió ese nombre; de juntar en medicina y en genética a tres escritores como lo son Jorge Luis Borges, Macedonio Fernández y Julio Cortázar. Su conferencia dice así:

    El término almismo fue ideado por Macedonio Fernández porque defendía mucho el ensimismamiento y el pensamiento hacia el interior, mirar hacia adentro; cada uno somos un “sí mismo” que nos hace diferentes aunque al mismo tiempo podemos ser iguales. Todos tenemos esa parte interior que la medicina debe trabajar y que no puede olvidar.

    “El Libro del Almismo, el libro del pensar” nos lleva a replantear y a repensar un poco la medicina que queremos, una medicina vuelta a pensar.

    Quiero contarles la historia de cómo se llegó a este libro y por qué y para qué se sigue trabajando en estos temas: Después de mi internado y de un trabajo un poco triste de rural, volví al Instituto de Genética y a la Universidad Javeriana en donde encontré al doctor Bernal y un espacio que estaba buscando para esa medicina diferente que quería, con un grupo de personas que me permitía no sólo ver la medicina sino ver muchas otras cosas más; había espacio para la literatura, para Mafalda, para hablar de niños, de locos, había incluso tiempo para hablar de medicina dentro del golf, de carros antiguos y de todo eso fui aprendiendo.

    Eso era lo que estaba buscando. Una medicina que diera espacios diferentes, que fuera más humanizada. Rápidamente me ubiqué y me quedé! No me arrepiento en lo absoluto de haberme quedado porque fue, ha sido y sigue siendo, una experiencia enriquecedora, de muchas vivencias importantes. Sabía exactamente dónde estaba y sabía que había que seguir rápido y había que trabajar muchos aspectos de esa medicina que estábamos buscando y de esa genética especial.

    Rápidamente empezamos a trabajar

  20. Actualidad del relativismo cultural

    OpenAIRE

    Sánchez Durá, Nicolás

    2013-01-01

    Este ensayo tiene tres propósitos. En primer lugar, propone examinar las relaciones entre etnocentrismo y relativismo. El etnocentrismo puede tomar tres formas distintas: a saber, la de una universalidad impostada, la del exotismo y la de un particularismo narcisista exacerbado. El relativismo cultural es una postura que asume la inconmensurabilidad de los conceptos y valores que deben ser considerados como válidos dentro de las imágenes del mundo definidas. En segundo lugar, se argumenta que...

  1. el Valle del Cauca

    Directory of Open Access Journals (Sweden)

    Carlos Humberto Ortiz

    2007-01-01

    Full Text Available Este artículo se enfoca en la identi- ficación de aquellos factores estructurales que explican la pérdida de dinamismo económico de largo plazo en Colombia y, en particular, en el Valle del Cauca. Se examina la competitividad del Valle en relación con Colombia y con el resto del mundo. Se cuestiona la insistencia en una estrategia exportadora como dinamizadora del desarrollo económico. Se identifica que una gran parte de la población está excluida de los beneficios del desarrollo económico. Para construir un modelo de desarrollo que incluya a esta población se recomienda recuperar la senda de la industrialización, invertir en el capital humano (educación de alta calidad, salud, salubridad y nutrición, e invertir en infraestructura. La participación del Estado en estas inversiones sociales es necesaria para disminuir la desigualdad y aumentar el crecimiento económico.

  2. Espectroscopia del Cometa Halley

    Science.gov (United States)

    Naranjo, O.; Fuenmayor, F.; Ferrin, L.; Bulka, P.; Mendoza, C.

    1987-05-01

    Se reportan observaciones espectroscópicas del cometa Halley. Los espectros fueron tomados usando el espectrógrafo del telescopio reflector de 1 metro del Observatorio Nacional de Venezuela. Se utilizó óptica azul, con una red de difracción de 600 lineas/min, obteniéndose una dispersión de 74.2 A/mm y una resolución de 2.5 A, en el rango espectral de 3500 a 6500 A. Seis placas fueron tomadas con emulsión IIa-O y dos con IIa-D. Los tiempos de exposición fueron entre 10 y 150 minutos. El cometa se encontraba entre 0.70 y 1.04 UA del Sol, y entre 1.28 y 0.73 UA de la Tierra. Las emisiones más prominentes en el espectro, son las del CN, C2, y C3. Otras emisiones detectadas corresponden a CH, NH2 y Na. Los espectros muestran un fuerte continuo, indicando un contenido significativo de polvo. Se detectó mayor intensidad del contínuo, en la dirección anti solar, lo cual es evidencia de la cola de polvo.

  3. Inventario nacional del uso actual del agua

    OpenAIRE

    Oficina Nacional de Evaluación de Recursos Naturales

    1984-01-01

    Establece como se emplea el agua en el Perú, teniendo en cuenta el tipo de uso, consuntivo y no consuntivo, discriminando según sea el destino: agrícola, pecuario, poblacional,industrial, minero, energético y pesquero, así como su localización geográfica; ello con la finalidad de que sirva de información básica para la planificación del desarrollo.

  4. Gerencia del cuidado-gerencia del servicio

    Directory of Open Access Journals (Sweden)

    Marta Palmet Jiménez

    2016-01-01

    Full Text Available La gerencia de este siglo debe estar plenamente identificada con la administración para planear, organizar, decidir y obtener resultados definidos, evaluados y alcanzados a través de las personas. Para poder gerenciar el cuidado se debe saber administrar. El objetivo de enfermería es cuidar; el objetivo de la gerencia es la conducción de la producción de bienes o servicios en las organizaciones. La gerencia del cuidado implica: motivación, creatividad, responsabilidad y ética por parte del cuidador y de quien cuida, claridad de actitud frente al ser y al qué hacer por parte del cuidador. Se puede concluir que la gerencia (administración, el cuidado (producto de calidad, el servicio (valor intangible, querer servir son un trinomio que deben ir de la mano de manera integrada para el logro de los objetivos propuestos por la organización de salud y de enfermería.

  5. La erosión y sus implicaciones en la morfología de la micro cuenca del Igarapé Apeú, Estado do Pará, Brasil

    Directory of Open Access Journals (Sweden)

    Odete Cardoso de Oliveira Santos

    2007-01-01

    Full Text Available Las aguas de los canales que componen la micro cuenca del canal Apeú, ubicada en el nordeste del estado del Pará, en tierras de los municipios de Castanhal (70%, Inhangapí (10% y Santa Isabel do Pará (20%, son muy aprovechadas por los ribereños y pequeños campesinos. Por eso, en esta investigación se muestra que la erosión acelerada por las actividades antrópicas contribuye a los cambios de la morfología de  los  canales  fluviales  que  componen  la  microcuenca.  Para  medir  la  erosión  en  pendiente  se  empleó  la metodología de las estacas; para la erosión marginal en los canales se utilizó la metodología de los Pinos y de las Estacas. Los análisis fisicoquímicas de los sedimentos de los barrancos y del fondo de los canales fueron determinados por las técnicas descriptas por Guimarães et al. (1970, EMBRAPA (1997 y  Silva (1999. La profundidad de los canales se midió usando el molinete en vado, en el momento de las mediciones de los caudales en las secciones transversales de los canales. De acuerdo con los resultados, la pérdida de suelo por la erosión de la pendiente llegó a 74,02 m en el periodo de octubre de 2002 a julio de 2003. El canal Apeú, el principal de la microcuenca, en la hacienda Morro Verde abandonó su lecho normal por espacio de 50 metros, a causa de los sedimentos provenientes de surcos, zanjas y barrancos formados en el interior de la hacienda mencionada. En ese mismo canal, en el periodo menos lluvioso, en la villa agrícola de Macapazinho, en la mitad del lecho, el nivel de las aguas alcanzó  0,5 m; en el periodo lluvioso llegó a 3,0 m. En los canales predomina la carga del lecho.

  6. La erosión y sus implicaciones en la morfología de la micro cuenca del Igarapé Apeú, Estado do Pará, Brasil

    Directory of Open Access Journals (Sweden)

    de Oliveira Santos Odete Cardoso

    2007-11-01

    Full Text Available Las aguas de los canales que componen la micro cuenca del canal Apeú, ubicada en el nordeste del estado del Pará, en tierras de los municipios de Castanhal (70%, Inhangapí (10% y Santa Isabel do Pará (20%, son muy aprovechadas por los ribereños y pequeños campesinos. Por eso, en esta investigación se muestra que la erosión acelerada por las actividades antrópicas contribuye a los cambios de la morfología de los canales fluviales que componen la microcuenca. Para medir la erosión en pendiente se empleó la metodología de las estacas; para la erosión marginal en los canales se utilizó la metodología de los Pinos y de las Estacas. Los análisis fisicoquímicas de los sedimentos de los barrancos y del fondo de los canales fueron determinados por las técnicas descriptas por Guimarães et al. (1970, EMBRAPA (1997 y Silva (1999. Laprofundidad de los canales se midió usando el molinete en vado, en el momento de las mediciones de los caudales en las secciones transversales de los canales. De acuerdo con los resultados, la pérdida de suelo por la erosión de la pendiente llegó a 74,02 m en el periodo de octubre de 2002 a julio de 2003. El canal Apeú, el principal de la microcuenca, en la hacienda Morro Verde abandonó su lecho normal por espacio de 50 metros, a causa de los sedimentos provenientes de surcos, zanjas y barrancos formados en el interior de la hacienda mencionada. En ese mismo canal, en el periodo menos lluvioso, en la villa agrícola de Macapazinho, en la mitad del lecho, el nivel de las aguas alcanzó 0,5 m; en el periodo lluvioso llegó a 3,0 m. En los canales predomina la carga del lecho.

  7. Determinantes del ingreso y del gasto corriente de los hogares

    OpenAIRE

    Muñoz C., Manuel

    2004-01-01

    Este ensayo de investigación empírica analiza los determinantes del ingreso y del gasto en los hogares colombianos. Utilizando un modelo del ciclo de vida con datos de la encuesta de hogares de 1994 y 1995, muestra que el comportamiento del ingreso está afectado principalmente por las características demográficas del hogar y los rasgos socio ocupacionales de sus miembros. El comportamiento del gasto está determinado ante todo por el ingreso y, en menor medida, por las características sociales...

  8. Las fluctuaciones del nivel del mar durante el Cuaternario

    OpenAIRE

    Pousa, Jorge Lorenzo; Isla, Federico Ignacio; Schnack, Enrique Jorge

    2002-01-01

    Los cambios del nivel del mar han ejercido una fuerte influencia en la evolución del planeta y en la historia de la humanidad. En una escala de tiempo geológico, las variaciones de los niveles oceánicos han dejado un registro ampliamente distribuido en la forma de depósitos sedimentarios. El descenso del nivel del mar durante la Ultima Glaciación, que alcanzó unos 120 metros hace 18.000 años, permitió la emergencia del estrecho de Bering y la migración humana desde Eurasia hacia América. Se e...

  9. La imagen del pase.

    Directory of Open Access Journals (Sweden)

    Hernando Bernal.

    1999-11-01

    Full Text Available A partir de un texto del poeta Octavio Paz llamado «La imagen», se busca proseguir la equivalencia entre las imágenes de la poesía y la función que ellas tienen para el poeta, y el fantasma fundamental y su función para el analizante que está en el momento del pase. Se parte de la idea de que la poesía busca entrar en el ser así como el psicoanálisis tiene como finalidad apuntar al corazón del ser del sujeto. Se hace entonces una distinción del concepto de «ser» para el psicoanálisis, haciendo alusión también al discurso de la filosofía. Esclarecido el sentido de lo que es el «ser» para el psicoanálisis, se aborda de lleno – entre otras cosas, relacionadas con la experiencia del pase específicamente- la equivalencia entre la definición que hace Octavio Paz de «La Imagen» y el momento del pase en el análisis de un sujeto, imagen que, al igual que el mito para la filosofía, las leyes para la ciencia y el matema para el psicoanálisis, se constituyen en los instrumentos con los que cada una de estas disciplinas horadan en lo real.

  10. del Estado Aragua

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    Joselys Cintia Zerpa

    2008-01-01

    Full Text Available Diagnostica la situación actual de los bienes que conforman al patrimonio histórico-cultural del Municipio Zamora, Estado Aragua, Venezuela. La Investigación es descriptiva y de campo, comprendió la elaboración de un inventario de los bienes inmuebles, festividades religiosas y manifestaciones artesanales del municipio. Se estudiaron la condición física y uso actual de estos bienes y los planes y proyectos existentes. Analizó el marco normativo que los rige. Se obtuvo la opinión de los representantes de organismos públicos relacionados con la actividad turística del Municipio, de los visitantes, cronistas e historiadores. Aportes: La mayoría de los bienes se encuentran en buen estado de conservación, Las manifestaciones culturales, festividades y la artesanía se desarrollan periódicamente pero no son aprovechadas turísticamente, Se determinó que existe un marco normativo para tales bienes y No existen propuestas actuales referentes a estos bienes. Se reflejó el interés de los sectores institucional y privado para la incorporación de estos bienes a la oferta turística del Municipio y del Estado

  11. APOSTILLAS ACERCA DEL POSTRABAJO

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    Arturo Torrecilla

    2000-01-01

    Full Text Available El más reciente debate en torno al postrabajo transforma la herencia de los dos ciclos que le precedieron desde los años setenta. El primero se correspondía con la crítica de la división social y técnica de labores informada por una filosofía de la alienación o bien por una rectificación de la arquitectónica marxista pero salvaguardando la promesa laborista del buen trabajo. El segundo ciclo hacía eco del rechazo a las cadenas de montaje fordistas y se abría al horizonte de la abolición del trabajo salarial, manteniendo sin embargo el abolengo del sujeto unitario de la historia. La presente escena asume una densidad mayor, producto del encuentro entre las nuevas tecnologías informacionales, las discusiones en el ámbito de la sociología y la antropología, de la tecnología y la ciencia, junto al dueto que inaugura el posmodernismo.

  12. Apostillas acerca del postrabajo

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    Arturo Torrecilla

    2000-04-01

    Full Text Available El más reciente debate en torno al postrabajo transforma la herencia de los dos ciclos que le precedieron desde los años setenta. El primero se correspondía con la crítica de la división social y técnica de labores informada por una filosofía de la alienación o bien por una rectificación de la arquitectónica marxista pero salvaguardando la promesa laborista del buen trabajo. El segundo ciclo hacía eco del rechazo a las cadenas de montaje fordistas y se abría al horizonte de la abolición del trabajo salarial, manteniendo sin embargo el abolengo del sujeto unitario de la historia. La presente escena asume una densidad mayor, producto del encuentro entre las nuevas tecnologías informacionales, las discusiones en el ámbito de la sociología y la antropología, de la tecnología y la ciencia, junto al dueto que inaugura el posmodernismo.

  13. La universidad del futuro

    Directory of Open Access Journals (Sweden)

    FERNANDO SANCÉN CONTRERAS

    2013-01-01

    Full Text Available El trabajo señala la necesidad de reconstruir la Universidad, dado el dinamismo que muestra la ciencia y la sociedad, pues trae consigo cambios sustanciales en la visión del mundo y en el aumento del poder del hombre sobre la naturaleza. Se analizan los supuestos epistemológicos de la universidad tradicional y se propone una nueva explicación del conocimiento humano, enfatizando el conocimiento científico. Postula una docencia fundada en las propiedades de la ciencia, cuyo método inductivo basado en los paradigmas vigentes: analítico, crítico, pragmático, ofrece una herramienta para la docencia, la investigación y la difusión de la cultura. Se propone una educación centrada en el sujeto que se hace a sí mismo (etopoiética y que insiste en el proceso de auto-creación del individuo y de la sociedad.

  14. Significado presente del CSIC

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    Garrido Gallardo, Miguel Angel

    2000-05-01

    Full Text Available Not available

    Este artículo, elaborado en 1999, ofrece una panorámica de la realidad del Consejo Superior de Investigaciones Científicas en la actualidad. Repasa su organización, su volumen de publicaciones, sus indicadores de productividad, su capacidad de obtener recursos y, en suma, su lugar en el conjunto del sistema español de Ciencia y Tecnología, considerado en sí mismo y en relación con la Universidad. Como conclusión del repaso de datos, se afirma que, aunque la fórmula del CSIC, como organismo nacional e interdisciplinario, no es la única posible, la organización del Estado de las Autonomías, así como la evaluación de los datos con que se cuenta, la hacen vivamente recomendable. No hay, pues, sino que seguir con su desarrollo.

  15. Dalt del tren

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    Jaume Subirana

    2001-11-01

    Full Text Available Ens consta que la saviesa popular hi toca més del que a aquest temps d’enquestes, telèfons mòbils i targetes de crèdit li ve de gust admetre, per això em fa gràcia, en veure la pausada però continuada intrusió de la cultura catalana a Internet, recordar les cançons de quan era petit: “Dalt del tren, tots anem-hi dalt del tren, hi ha lloc per tota la gent”, dèiem, i “El tren pinxo de Banyoles és el més bonic que hi ha, ple de llaunes i cassoles i barrets de capellà”. I resulta que per una vegada a la vida hem pujat, efectivament, dalt del tren que passava per l’estació de Catalunya i en cinc anys hem passat de gairebé res a prou pàgines amb un contingut, a més, apreciable i, sobretot, a un petit teixit de persones i institucions que han entès la importància de la revolució comunicativa que Internet representa i que hi teixeixen i projecten webs amb el convenciment dels conversos.

  16. Las carreras del futuro

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    Luis Piscoya Hermoza

    2011-07-01

    Full Text Available La primera década del siglo XXI ha estado signada por un énfasis en los estudiosde prospectiva, los mismos que, a partir de procesos de complejizacióny articulación de la sociedad planetaria como son la digitalización, el progresivodeterioro del medio ambiente, la necesidad del cambio de la matriz energéticay la globalización del mercado, han ensayado hipótesis para identificar lastendencias que se fortalecerán y profundizarán durante las próximas décadas.Desde el punto de vista metodológico, existen muchas maneras de clasificarlaspara conceptualizarlas y entenderlas mejor. Sin embargo, considerando lanaturaleza de esta edición nos proponemos enfocar directamente aquellas queestán estrechamente ligadas a la formación universitaria.Naturalmente, no pensamos que estamos ante tendencias inevitables en lamedida que epistemológicamente la creencia en leyes históricas deterministases insostenible y la práctica social nos muestra que la construcción del futuroes nuestra responsabilidad y siempre rebasa las mejores previsiones.

  17. Registro del águila elegante (Spizaetus ornatus en la Reserva de la Biosfera sierra de Manantlán, Jalisco-Colima, México A new record for the Ornate Hawk-Eagle (Spizaetus ornatus in the Sierra Manantlán Biosphere Reserve, Jalisco-Colima, Mexico

    Directory of Open Access Journals (Sweden)

    Marcelo Aranda

    2009-04-01

    Full Text Available Se presenta un registro del águila elegante (Spizaetus ornatus en un bosque de encino-pino de la Reserva de la Biosfera Sierra de Manantlán, Jalisco-Colima, correspondiente a un individuo de 2 a 3 años de edad. Este registro es significativo ante la escasez de registros de esta especie en el occidente de México, los cuales corresponden a localidades en los estados de Nayarit (1 Colima (3, Jalisco (1 y Guerrero (1. Se considera que el águila elegante está en peligro de extinción en México (NOM-059-ECOL-2001; su presencia en esta área natural protegida da aliento para su conservación.An immature Ornate Hawk-Eagle (Spizaetus ornatus was observed and photographed while perched in pine-oak forest in the Sierra de Manantlán Biosphere Reserve, Jalisco-Colima, Mexico. From plumage characteristics we believe the eagle to be 2-3 years old. This record is significant due to the paucity of records for this species in Western Mexico: Nayarit (1 Colima (3, Jalisco (1 and Guerrero (1. The Ornate Hawk-Eagle is considered as a threatened species in Mexico, and this record from a natural protected area brings hope for its conservation.

  18. Selezione invernale dell'habitat e densità del cervo (Cervus elaphus e del capriolo (Capreolus capreolus nel Parco Nazionale d'Abruzzo

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    R. Latini

    2003-10-01

    Full Text Available Nel Parco Nazionale d'Abruzzo è stata studiata la selezione dell'habitat invernale di cervo e capriolo da aprile a maggio del 2000 e del 2002, in un'area caratterizzata da boschi di faggio, rimboschimenti a pino nero e pascoli. È stata utilizzata la tecnica del pellet group count, su transetti lineari larghi 2 metri, individuati ogni 100 m di quota, lungo le isoipse da 1350 a 1950 m s.l.m. Sono stati percorsi 61 km ed è stata campionata un'area di 12 ha. Per ogni gruppo di escrementi (1583 per il cervo e 946 per il capriolo sono state rilevate l'altitudine, la pendenza, l'esposizione e il tipo di vegetazione. È stato assunto che tutti gli habitat fossero ugualmente disponibili ed accessibili e che le disponibilita fossero conosciute (Alldredge et al., 1998. I dati raccolti sono stati elaborati applicando il test del Χ², la statistica di Bonferroni (Neu et al., 1974 e l'indice Jacobs (Jacobs, 1974. Il cervo ha selezionato aree comprese tra 1300 e 1500 m s.l.m. (p<0.01, un range altimetrico più ristretto rispetto al capriolo che seleziona anche le quote piu elevate, comprese cioè tra 1300 e 1700 m s.l.m. (p<0.01. Entrambi i cervidi selezionano le zone più scoscese (21°-60° (p<0.01: Il cervo seleziona le classi d'esposizione comprese tra sud-est ed ovest (p<0.01, mentre il capriolo i versanti sud-ovest e ovest (p<0.01. Entrambe le specie preferiscono ambienti di transizione ed evitano le zone di bosco maturo ed i pascoli d'alta quota (p<0.01. Utilizzando il tasso di defecazione è stata calcolata la densità delle due specie (Mayle, 1999 che è risultata di 2.7 cervi/100 ha e 1.0 caprioli/100 ha. Le due specie selezionano le stesse risorse, suggerendo, così come riscontrato da altri autori (Welch, 1989, una convergenza per quanto riguarda l'uso invernale dell'habitat. La scelta d'aree poste a quote medio-basse, di zone scoscese e di versanti meridionali potrebbe essere legata alla minore altezza e persistenza

  19. Componente Cultura del Agua del PMGRH: plan de trabajo

    OpenAIRE

    Autoridad Nacional del Agua; Proyecto de Modernización de la Gestión de Recursos Hídricos

    2012-01-01

    Describe el plan de trabajo del Componente Cultura del Agua del Proyecto de Modernización de la Gestión de Recursos Hídricos (PMGRH) en relacion a dos aspectos estructurales del proyecto: 1. Mejora de la capacidad de la Gestión Integrada de Recursos Hídricos (GIRH) a nivel nacional y 2. Fortalecimiento de las capacidades de GIRH en las cuencas.

  20. En busca del concepto de gerencia del cuidado

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    Ligia Teresa Mora-Delgado

    2005-12-01

    Full Text Available Este articulo, presenta los conceptos de gerencia del cuidado de enfermería, desarrollado por las enfermeras profesionales que laboran en le Empresa social del estado Hospital Universitario Erasmo Meoz de las Ciudad de Cúcuta, desde su desempeño en la asistencia, administración y docencia. Se pretende además precisar los elementos gerenciales, sociales, humanísticos y éticos que deben hacer parte del concepto de gerencia del cuidado.

  1. LA PERSISTENCIA DEL SUBALTERNO

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    John Beverley

    2002-01-01

    Full Text Available Este trabajo es el texto literal de una ponencia presentada en un panel sobre los estudios culturales latinoamericanos en el congreso de LASA en 2001 en Washington DC. Representa la posición desarrollada en el trabajo colectivo del llamado Grupo de Estudios Subalternos Latinoamericano, desde nuestra fundación en 1992 hasta la disolución del grupo en 2001, que sirve como pretexto introductorio para la ponencia. Los otros participantes en el panel eran Walter Mignolo, representando los estudios poscoloniales, Néstor García Canclini y John Kraniauskas, representando los estudios culturales, y Nelly Richard representando la llamada crítica cultural. El trabajo dialoga y debate con cada una de estas posiciones respectivamente desde el punto de vista específico de los estudios subalternos. Concluye con un llamado a una crítica del saber académico en sí.

  2. Acalasia. Controversias del tratamiento

    OpenAIRE

    Restrepo P, Antonio J; Rey T, Mario H; Garzón O, Martín A; Farfán Q, Yesid A; Molano V, Juan C; Marulanda, Juan C; Lizarazo, Jorge I

    2007-01-01

    La acalasia es un desorden motor del esófago caracterizado por pérdida de la peristalsis esofágica con falta en la relajación o relajación incompleta del esfínter esofágico inferior (EEI) (1). La causa exacta de este trastorno es desconocida. Los síntomas más comunes son disfagia, regurgitación, pérdida de peso y dolor torácico (2). La manometría esofágica es el principal método diagnóstico, mostrando aperistalsis del cuerpo esofágico con aumento de la presión, falta de relajación o relajació...

  3. Procedimiento Del Triple Fin

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    Oscar L. Bellido Aguilera

    2008-01-01

    Full Text Available Presenta un procedimiento novedoso basado en un método dialéctico - sistémico - integrador, que facilita la precisión de los fines u objetivos más generales de un proceso de desarrollo comunitario o de otros procesos de cambio deseados (un proyecto sociocultural, una investigación social, un proceso de mejoramiento organizacional, etc.. Su importancia radica en que los fines, según Marx, son una guía que rige como una ley la actuación del hombre y determinarlos es parte esencial del planeamiento del cambio. Se trata de un asunto aparentemente simple, sin embargo, en la práctica es mucho más problemático de lo que comúnmente se cree.

  4. Efecto del silicio y plaguicidas en la fertilidad del suelo y rendimiento del arroz

    OpenAIRE

    Furcal-Beriguete, Parménides; Herrera-Barrantes, Alejandra

    2013-01-01

    Efecto del silicio y plaguicidas en la fertilidad del suelo y rendimiento del arroz. El objetivo de este trabajo fue evaluar el efecto del silicio en la fertilidad del suelo, la incidencia de enfermedades y plagas insectiles, el rendimiento y la calidad de granos del cultivo de arroz. El estudio se realizó en La Vega, Florencia, San Carlos, Costa Rica entre mayo y octubre en los años 2010 y 2011, en el mismo lote con la variedad CR 4477. Se establecieron cinco tratamientos: silicio al suelo, ...

  5. Storia del pensiero matematico

    CERN Document Server

    Kline, Morris

    1999-01-01

    Costruita con l'intento di presentare le idee oltre ai protagonisti della matematica, questa storia ha il duplice pregio dell'esaustività e della chiarezza. Essa prevede infatti vari livelli di lettura: lo specialista vi trova una messe di dati, fonti e spunti di ricerca, mentre lo studente ha a disposizione un formidabile strumento di consultazione e sintesi. L'arco temporale coperto è vasto: dalla Mesopotamia a Euclide, da Fibonacci all'invenzione del calcolo infinitesimale, da Gauss a Poincare, con un'appendice dedicata agli sviluppi piu recenti scritta appositamente per la prima edizione italiana del 1991, nei «Manuali» Einaudi.

  6. La escritura del quechua

    OpenAIRE

    Authier, Martine du

    2015-01-01

    La mayor fantasía ha acompañado siempre la transcripción del quechua. El primer intento de sistematización fue el sistema de la Paz, en 1953. Sin embargo, no existe en el comercio un diccionario satisfactorio en lo que se refiere al quechua del Cusco y, prácticamente, nada se edita en quechua, fuera de algunos trabajos antropológicos bilingües. Bajo la égida de la UNESCO, la Academia Peruana de la Lengua Quechua, que tiene su sede en el Cusco, ha colaborado en un diccionario de doce de los tr...

  7. El lenguaje del cerebro

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    Antonio Ibáñez Molina

    2011-04-01

    Full Text Available La introducción de nuevas técnicas de análisis de ritmos EEG en estudio de la comprensión del lenguaje permite explorar esta habilidad humana desde una perspectiva de integración de grupos de redes neuronales. Los ritmos de disparo neuronal que generan estos grupos pueden conectarse por sincronía formando unidades funcionales transitorias distribuidas en diversas áreas del cerebro. En esta revisión comentamos algunos de estos ritmos y su relación con el lenguaje.

  8. Plasticidad del sistema nervioso

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    L. M. Garcia-Segura

    1976-06-01

    Full Text Available En este trabajo se revisan los conocimientos más recientes sobre el fenómeno de la plasticidad del sistéma nervioso, tanto a nivel morfológico como a nivel fisiológico y molecular. Se estudian los cambios morfólogicos y fisiológicos de las neuronas frente a la experiencia. Tambien se considera la adaptación molecular del sistéma nervioso a la información que recibe como la base de todo tipo de plasticidad.

  9. Las causas del desempleo

    OpenAIRE

    García Balbás, Salomé

    2014-01-01

    En este documento vamos a tratar de dar respuesta a la siguiente pregunta: ¿cuáles son las causas del desempleo? Para ello realizaremos un repaso de las principales teorías económicas del desempleo llegando a la conclusión de que existe una causa fundamental que lo genera: la rigidez de los salarios a la baja. Consideramos el desempleo como la existencia de un exceso de oferta en el mercado de trabajo y haremos alusión, únicamente, a la existencia de desempleo involuntario. La exposición de l...

  10. Inventario del Archivo del conde de Bornos

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    Pedro Antonio Porras Arboledas

    1995-01-01

    Full Text Available Mi primer contacto con esta Casa se remonta a algunos años atrás, cuando me Mamó la atención un documento muy interesante, publicado a comienzos del presente siglo por el ilustre erudito ubetense don Alfredo Cazaban, por el que los Reyes Católicos hacían merced a su secretario y jefe de la artillería real durante la Guerra contra Granada, Francisco Ramírez de Madrid, personaje madrileño de origen cántabro, de una heredad en término de Jaén —el cortijo de Bornos— por sus grandes esfuerzos en la conquista de las plazas, hasta el momento inexpugnables, de Cambil y Alhabar. Posteriormente, al realizar un estudio sobre el régimen señorial en el Reino de Jaén, intenté localizar los archivos de las diferentes casas nobiliarias asentadas en esta provincia, gracias a lo cual pude saber que la documentación del Condado de Bornos se hallaba en Madrid, bien en la Biblioteca Nacional o en el Archivo Histórico, ya que el actual Conde, el Excmo. Sr. Don Ignacio Ramírez de Haro, así me lo comunicó en marzo de 1983.

  11. Distribución del ocelote (Leopardus pardalis en San Luis Potosí, México Distribution of the ocelot (Leopardus pardalis in San Luis Potosí, Mexico

    Directory of Open Access Journals (Sweden)

    Jesús Manuel Martínez-Calderas

    2011-09-01

    Full Text Available Para definir la distribución geográfica del ocelote en el estado de San Luis Potosí, México, se obtuvieron nuevos registros de la especie. El estudio se realizó de enero de 2007 a abril de 2009. Se obtuvieron 41 registros de ocelotes por medio de entrevistas y trampeo-fotográfico. Los registros se localizaron en comunidades vegetales de selva baja caducifolia (37%, matorral submontano (22%, bosque de encino (15%, selva mediana (10%, selva alta perennifolia, bosque mesófilo de montaña, bosque de pino-encino y matorral desértico micrófilo (10%. La presencia de ocelotes se ubicó en los municipios de Ciudad del Maíz, El Naranjo, Cerritos, Guadalcázar, San Nicolás Tolentino y Ciudad Valles en de elevaciones de 38 a 2 400 m snm. Los resultados de esta investigación sugieren una distribución del ocelote más hacia el oeste del estado respecto a su distribución original. El presente estudio definió nuevas regiones con presencia de ocelotes que pueden ser consideradas en el desarrollo de estrategias de conservación de la especie en el estado de San Luis Potosí.To determine the geographic distribution of ocelot in the state of San Luis Potosí, Mexico, we obtained new records. The study was conducted from January 2007 to April 2009. We recorded 41 ocelot records by interviews and camera-trapping. Ocelots records were located in tropical deciduous forest (37%, semitropical thornscrub (22%, oak forest (15%, tropical forest (10%, tall tropical deciduous forest, desert scrub, pine-oak forest and clouded forest (10%. Ocelot records were located in the municipalities of Ciudad del Maíz, El Naranjo, Cerritos, Guadalcazar, San Nicolás Tolentino and Ciudad Valles where the elevation ranged from 38 to 2 400 m. The evidence of this research suggests that ocelot range is more extended to the west than its original geographical range. This study defined new regions with presence of ocelots that may be considered to develop conservation strategies

  12. Competencia Desarrollo del Pensamiento Creativo

    OpenAIRE

    Rodríguez, Eric; Miceli, Francisco; Tiburcio, Georgina; Gómez, Orlando

    2012-01-01

    1. ¿Qué significa la competencia Desarrollo del Pensamiento Creativo? 2. ¿Por qué es relevante que adquiera la competencia Desarrollo del Pensamiento Creativo en mi formación? 3. ¿Cómo aprendo la competencia Desarrollo del Pensamiento Creativo? 4. ¿Cómo aplico la competencia Desarrollo del Pensamiento Creativo? 5. ¿Cómo puedo autoevaluar mi competencia (con miras a un constante crecimiento)?

  13. Ruptura del projecte parental i disposició dels preembrions

    OpenAIRE

    Farnós Amorós, Esther

    2010-01-01

    La tesi doctoral "Ruptura del projecte parental i disposició dels preembrions" analitza els efectes del consentiment a les tècniques de reproducció assistida prestat en el marc d'un projecte parental. La tesi ofereix una resposta als conflictes que enfronten exesposos o exconvivents en relació al destí dels preembrions sobrants d'un cicle de fecundació "in vitro" iniciat durant la relació. Aquests conflictes constitueixen un grup de casos al voltant del qual no hi ha solucions legislatives qu...

  14. La equinoterapia en las distintas alteraciones del desarrollo del menor.

    OpenAIRE

    Chamorro González, Mireya

    2015-01-01

    La equinoterapia consiste en la utilización del caballo como un método terapéutico para rehabilitar a personas con discapacidad. Esta terapia es considerada una gran alternativa para aumentar el autoestima de los que sufren algún tipo de discapacidad, también a través de esta terapia se mejora y fortalece el estado emocional, así del mismo modo ayuda a mejorar la manera de desenvolverse en su entorno social. Esta terapia se realiza a través de la trasmisión del calor corporal del caballo, del...

  15. Gestión del riesgo del cambio (segunda parte)

    OpenAIRE

    Zorrilla Salgador, Juan Pablo

    2004-01-01

    Segunda parte del artículo acerca del uso de futuros sobre el tipo de cambio. Esta continuación abarca estrategias, definiciones, metodología y explicaciones sobre todo lo relacionado con el Ratio de cobertura de los futuros y la aparición del riesgo base.Segunda parte del artículo acerca del uso de futuros sobre el tipo de cambio. Esta continuación abarca estrategias, definiciones, metodología y explicaciones sobre todo lo relacionado con el Ratio de cobertura de los futuros y la aparición d...

  16. del's Proof

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 12; Issue 5. Gödel's Proof - Incompleteness Theorems. S M Srivastava. General Article Volume 12 Issue 5 May 2007 pp 71-84. Fulltext. Click here to view fulltext PDF. Permanent link: https://www.ias.ac.in/article/fulltext/reso/012/05/0071-0084. Keywords.

  17. Marketing Mix del Software.

    Directory of Open Access Journals (Sweden)

    Yudith del Carmen Rodríguez Pérez

    2006-03-01

    Por ello, en este trabajo se define el concepto de producto software, se caracteriza al mismo y se exponen sus atributos de calidad. Además, se aborda la mezcla de marketing del software necesaria y diferente a la de otros productos para que este triunfe en el mercado.

  18. Gerencia del servicio

    OpenAIRE

    Nancy Peña Acosta

    1992-01-01

    Estamos en la era de la pirámide invertida donde el cliente es primero por lo que es fundamental incentivar la calidad desde abajo; hacer que el trabajador defina su misión, sienta que es parte de la compañía para que la satisfacción del negocio realizado sea de todos.

  19. El Juego del Juego

    OpenAIRE

    Carvalho, Nazaré Cristina

    2012-01-01

    DUVIGNAUD, Jean. El Juego del Juego. Santafé de Bogotá, Colômbia: Fondo de Cultura Econômica, 1997.The game gameDUVIGNAUD, Jean. The Game Game. Santafé de Bogotá, Colombia: Fondo de Cultura Econômica, 1997

  20. El helor del cuerpo

    OpenAIRE

    Sánchez-Biosca, Vicente

    1992-01-01

    Ensayo sobre las formas clásicas y modernas de la metamorfosis. En esta figura mitológica se advierte de manera privilegiada la entrada del imaginario científico, biológico y genético en el dominio de las construcciones literarias y cinematográficas.

  1. Carta del Editor

    Directory of Open Access Journals (Sweden)

    Luis Eladio Proaño

    2014-12-01

    Full Text Available La publicación se centra en temas como: Procesos electorales en México e Italia, se analizan los procesos comunicacionales y sus efectos; las infiltraciones de las agencias de seguridad en la actividad periodística en Europa; la radio y la televisión pública en los EE.UU. Para conocer cómo la prensa enfrenta los problemas críticos entre países, esta el caso de Uruguay y Argentina (discrepancia por la planta de procesamiento de papel y la contaminación del Río de La Plata. Otro artículo refiere la difícil relación entre los medios de comunicación y el gobierno de Chávez en Venezuela. Se aborda el caso brasileño para entender el crecimiento de los Observatorios de Medios; otro sobre el crecimiento del "periodismo confidencial" en la web y la prensa gratuita. Se estudia el impacto de la telenovela "pasión de gavilanes". Para quienes interese la penetración del Internet está: "Usos y competencias del weblog en las corporaciones" más otro sobre la lucha sorda que mantienen los gigantes de la autopista de la información Google y Yahoo.

  2. Punctualizaciones del CERN

    CERN Multimedia

    2002-01-01

    "Viene de la pagina anterior. Puntualizaciones del CERN. La valoracion que me merece la aprobacion en el Consejo de Ministros el 24 de mayo de un acuerdo de colaboracion entre el MCYT y el CERN para el proyecto de neutrinos al Gran Sasso es positiva" (1 page).

  3. Software del sistema osteomioarticular

    Directory of Open Access Journals (Sweden)

    Dianelys León Medina

    2015-06-01

    Full Text Available Introducción: la aplicación en la enseñanza de las Tecnologías de la Informática y las Comunicaciones, es una de las líneas que ha trazado el sistema de salud cubano en estudiantes de las ciencias médicas. La anatomía es una de las ciencias que integra la disciplina de Morfofisiología y para facilitar su comprensión resulta necesario el empleo de recursos y estrategias, entre los que puede figurar un software educativo. Objetivo: diseñar un software sobre la anatomía del sistema osteomioarticular de cabeza y cuello para los estudiantes de primer año de la carrera de Estomatología de Pinar del Río. Material y método: se realizó un estudio cualitativo. Para obtener los resultados se utilizó el método materialista dialéctico. Para la dialéctica del desarrollo del proceso estudiado se utilizaron los métodos teóricos, empíricos, el estudio profundo del tema, tipo de plataforma a utilizar y criterios de los especialistas. Para su procesamiento se utilizaron técnicas estadísticas descriptivas e inferenciales no paramétricas. Resultados: debido a la necesidad de fortalecer en los estudiantes las habilidades en la utilización de las tecnologías de la informática y las comunicaciones, se elaboró el software de la anatomía del sistema osteomioarticular de cabeza y cuello "Aprendiendo anatomía" mediante imágenes, videos y textos. Conclusiones: el software constituye un aporte al proceso enseñanza aprendizaje, el cual facilita el trabajo independiente y autopreparación mediante la interactividad con el contenido, retroalimentación y evaluación utilizando medios de enseñanza modernos, lo cual tributa al modo de actuación del futuro egresado.

  4. Historia deldel = History of Padel

    Directory of Open Access Journals (Sweden)

    Bernardino Javier Sánchez-Alcaraz Martínez

    2013-10-01

    Full Text Available El presente trabajo resume la historia del deporte deldel. Existen dos versiones sobre el origen deldel. La primera versión relaciona los antecedentes deldel con los de otros deportes de raqueta como el tenis o el bádminton, siendo su origen común el jeu de la paume francés. Posteriormente, surgen variantes en Estados Unidos como el Paddle Tennis y el Platform Tennis, siendo versiones reducidas del tenis, pero con elementos muy comunes al pádel actual. La segunda versión, aprobada por la Federación Internacional de Pádel, afirma que este deporte nació en México, en 1969, a través del empresario Enrique Corcuera.--------------------------------------------------------------------This research summarizes the history of paddle sport. There are two versions about the origin of paddle. The first version relates the history of paddle with other racket sports like tennis or badminton, and its common origin of the Jeu de Paume French. Later, in in the United States, appear two sports called Paddle Tennis and Platform Tennis, which are reduced versions of tennis sport, but these have lot of common characteristics with paddle. The second version, approved by the International Padel Federation, said the sport was born in Mexico in 1969, through the businessman Enrique Corcuera.

  5. Determinantes del ingreso y del gasto corriente de los hogares

    Directory of Open Access Journals (Sweden)

    Muñoz C., Manuel

    2004-06-01

    Full Text Available Este ensayo de investigación empírica analiza los determinantes del ingreso y del gasto en los hogares colombianos. Utilizando un modelo del ciclo de vida con datos de la encuesta de hogares de 1994 y 1995, muestra que el comportamiento del ingreso está afectado principalmente por las características demográficas del hogar y los rasgos socio ocupacionales de sus miembros. El comportamiento del gasto está determinado ante todo por el ingreso y, en menor medida, por las características sociales del hogar y el gasto de otros hogares con características similares. También examina la influencia de la incertidumbre acerca de los ingresos en el gasto de los hogares para comprobar si estos actúan con motivos de precaución.

  6. Estudio del CH interestelar

    Science.gov (United States)

    Olano, C.; Lemarchand, G.; Sanz, A. J.; Bava, J. A.

    El objetivo principal de este proyecto consiste en el estudio de la distribución y abundancia del CH en nubes interestelares a través de la observación de las líneas hiperfinas del CH en 3,3 GHz. El CH es una molécula de amplia distribución en el espacio interestelar y una de las pocas especies que han sido observadas tanto con técnicas de radio como ópticas. Desde el punto de vista tecnológico se ha desarrollado un cabezal de receptor que permitirá la realización de observaciones polarimétricas en la frecuencia de 3,3 GHz, con una temperatura del sistema de 60 K y un ancho de banda de 140 MHz, y que será instalado en el foco primario de la antena parabólica del IAR. El cabezal del receptor es capaz de detectar señales polarizadas, separando las componentes de polarización circular derecha e izquierda. Para tal fin el cabezal consta de dos ramas receptoras que amplificarán la señal y la trasladarán a una frecuencia más baja (frecuencia intermedia), permitiendo de esa forma un mejor transporte de la señal a la sala de control para su posterior procesamiento. El receptor además de tener características polarimétricas, podrá ser usado en el continuo y en la línea, utilizando las ventajas observacionales y de procesamiento de señal que actualmente posee el IAR.

  7. La pluridimensionalidad del rol del docente hospitalario

    Directory of Open Access Journals (Sweden)

    Marian Serradas Fonseca

    2015-07-01

    Full Text Available Este trabajo es el fruto de la observación y la investigación en la trayectoria personal y profesional de la autora dedicada a la educación de niños y niñas en situación de enfermedad u hospitalización. El objetivo de este ensayo es intentar definir de manera específica, el papel, tareas y competencias que el profesional del ámbito educativo tiene en la atención educativa hospitalaria; haciendo especial énfasis en la importancia de la formación de este profesional abogándose por una preparación que permita brindar una atención educativa de calidad a los niños y niñas en situación de enfermedad u hospitalizados.

  8. Riparian leaf litter processing by benthic macroinvertebrates in a woodland stream of central Chile Procesamiento de detritus ripariano por macroinvertebrados bentónicos en un estero boscoso de Chile central

    Directory of Open Access Journals (Sweden)

    CLAUDIO VALDOVINOS

    2001-06-01

    un importante impacto sobre las características energéticas de las comunidades fluviales de Chile central. Actualmente, los bosques exóticos existentes en esta área están compuestos principalmente por Pinus radiata (D. Don (pino insigne, llegando a cerca. del 80 % de las más de 1.800.000 ha de plantaciones forestales. El objetivo de este estudio fue analizar el efecto de camadas de hojas de una especie nativa dominante (Nothofagus pumilio y una especie exótica (P. radiata sobre el procesamiento de detritus realizado por macroinvertebrados bentónicos, en una cuenca experimental de Chile central (estero Rucúe; 36° 20' 00" S, 71° 47'40" O. Los resultados muestran que las tasas de procesamiento de los paquetes de hojas de la especie nativa son superiores a la exótica, sugiriendo que la sustitución de la flora nativa caducifolia por coníferas exóticas tiene un importante impacto sobre los componentes energéticos de los ecosistemas fluviales de Chile central. Los coeficientes de pérdida (k fueron 0,0072 para N. pumilio y 0,0027 para P. radiata. La abundancia y biomasa de fragmentadores por gramo de paquete de hojas explican las diferencias en las tasas de procesamiento de hojas, especialmente dos plecópteros Gripopterygidae, Limnoperla jaffueli y Antarctoperla michaelseni

  9. ABC del Ajedrez. I

    Directory of Open Access Journals (Sweden)

    Marisel Piñeiro Gomez

    2009-03-01

    Full Text Available La promoción del Ajedrez, su conocimiento y práctica por la población constituye uno de los programas de la Revolución, por tal motivo el presente trabajo está encaminado a proponer un material bibliográfico con variadas posiciones sobre el movimiento-captura de las piezas y los sistemas de notación para los masificadores de Ajedrez del municipio Pinar del Río. En esta investigación se utilizaron variados métodos: teóricos, empíricos y estadísticos, además, como método rector el dialéctico materialista. Constituye una novedad científica porque aporta un material bibliográfico que contiene: la composición,  disposición  e  identificación  del  tablero de  ajedrez;  identificación, colocación, movimiento y captura de las piezas de ajedrez; la promoción del Peón; el valor absoluto de las piezas; los sistemas de notación: descriptivo y algebraico. Se le incluyen más de trescientos gráficos, conceptos que son trabajados de lo simple a lo complejo de manera tal que el masificador de Ajedrez lo utilice en sus clases donde se viabilice el conocimiento gracias a las facilidades que le aporta el material; ofrece algoritmos que le guiarán a elaborar nuevas posiciones, los cuales son inexistentes para este propósito en otras bibliografías; su significación práctica radica en que proporciona, tanto al estudiantado como profesorado, ejercicios de ajedrez sencillos que les permitirá a los primeros para que les sirva en su comportamiento, y a los segundos utilizarlos en su auto preparación; el interés social se halla en que pueden ser utilizados por profesores, personal de apoyo a la docencia,  técnicos  del  INDER,  familiares  de  los  estudiantes  para  ayudarlos;  el interés educativo reside en que a través de esos ejercicios contribuimos al fortalecimiento de valores.

  10. Arco del milenio

    Directory of Open Access Journals (Sweden)

    Adell, Josep Mª

    2005-02-01

    the most significant stages in the erection of the Millennium Arch outside the Palacio de Congresos, venue for the 12th IBMAC.
    These pictures are divided into six chapters: Background, Components, Springline, Piers, Arch, Centring Erection and Removal, and Trimming.

    A lo largo de la historia, el Arco de fábrica ha sido el componente constructivo más característico de la Arquitectura y la Ingeniería desde que después de sus inicios etruscos en la época romana fuera desarrollado adelantándose con ello a la cultura helénica.
    El Arco, desde entonces, viene empleándose como una solución constructiva eficiente para cubrir espacios con materiales que no soportan tracciones. La originalidad técnica del Arco lo ha llevado a imponerse como símbolo de las hazañas bélicas como era el Arco de Triunfo.
    En el cambio de siglo y milenio en el que nos encontramos, un salto técnico fundamental se desvela en este Congreso, el Sistema de Albañilería Integral, que abre la posibilidad de ampliar el campo de aplicación de la albañilería con la incorporación del acero, a través de las perforaciones de las piezas, lográndose por fin armar en las tres direcciones del espacio cualquier muro de fábrica que se desee.
    El Arco del Milenio conmemoró el 12th IBMAC de Madrid, mostrando en él los avances técnicos que el Sistema de Albañilería Integral permite, al tratarse de un arco inclinado en el espacio y, por tanto, el primer arco de fábrica construido fuera de la vertical, mediante fábrica de Ladriflor aparejada a tizón, reforzada con barras y cercos.
    El Arco del Milenio, diseñado por J.M. Adell (Presidente del 12th IBMAC, parte de un cilindro de 14 m de diámetro, inclinado 30º sobre el terreno, y construido con fábrica de ladrillo de un pie de grueso, alternando una hilada de color amarillo de cada seis en rojo. El hueco deja un paso libre de 10 m de lado y 5,5 m de altura. La fábrica está armada regularmente por tendeles con cerchas cada

  11. Determinantes del trabajo infantil y la escolaridad: el caso del Valle del Cauca en Colombia

    Directory of Open Access Journals (Sweden)

    Sebastián Urueña Abadía

    2009-10-01

    Full Text Available Colombia, al igual que la mayoría de países latinoamericanos, consciente de las repercusiones sociales y económicas negativas del trabajo infantil, se ha comprometido en la lucha por la erradicación de este fenómeno. Prueba de ello es la ratificación por parte del gobierno colombiano en el año 2007, del Convenio 182 de la OIT sobre la Prohibición de las Peores Formas de Trabajo Infantil y la Acción Inmediata para su Eliminación. En el plano regional, como parte del Plan de Desarrollo del Departamento del Valle del Cauca 2008-2011, se está implementando actualmente una estrategia territorial de erradicación del trabajo infantil en sus 42 municipios. Considerando este panorama, este trabajo indaga cuáles son los determinantes del trabajo infantil y la escolaridad en el departamento del Valle a partir de los datos de la Encuesta Nacional de Calidad de Vida del año 2003. Para el análisis se emplea un modelo econométrico Probit Bivariado, que permite el estudio conjunto e interrelacionado de decisiones diferentes, en este caso la asistencia escolar y el trabajo.

  12. En defensa del indigenismo

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Huamán

    2011-05-01

    Full Text Available El indigenismo como movimiento literario, cultural, ideológico y políticoconstituye un hito, una referencia obligada de nuestra tradición culturaly literaria nacional. Su debate no se reduce ni limita a las primerasdécadas del siglo XX, etapa privilegiada en forma recurrente en los estudiosiniciales sobre esta corriente. Podemos afirmar, sin temor a equivocarnos,que no hay momento ni periodo, más o menos visible, en elque no se haya evaluado en forma crítica este acontecimiento, el mismoque ha resurgido con otras denominaciones o referencias (regionalismo,andinismo, mariateguismo, humalismo, etc., a lo largo de nuestro procesohistórico, pero imbuidas de la perspectiva inicial. El propósito deeste artículo es hacer una defensa del indigenismo contestando algunasposiciones contrarias como la de Mirko Lauer.

  13. RESPONSABILIDAD DEL ODONTOPEDIATRA

    OpenAIRE

    Guillen B., Celso

    2014-01-01

    La Responsabilidad de la atención del niño, requiere de una formación y preparación universitaria de la Segunda Especialidad en Odontopediatría para manejar organismos en proceso de crecimiento somático y psicológico. Es por eso que con el proceso de la ciencia se ha comprendido la importancia de la atención del niño desde que nace. Es así que se ha creado sistemas integrales de atención odontopediátrica durante los primeros años de vida, debido a la alta vulnerabilidad de contraer las enferm...

  14. Responsabilidad Constitucional del Gobierno

    Directory of Open Access Journals (Sweden)

    Francisco Zúñiga Urbina

    2006-01-01

    Full Text Available El artículo analiza la responsabilidad constitucional del Gobierno y sostiene que es jurídico-política, de lejano cuño penal y administrativo, y el procedimiento empleado para hacerla efectiva es la acusación en juicio político, que es un típico caso de "justicia política". A la responsabilidad constitucional se suman las responsabilidades civil y penal de Derecho Público del Presidente de la República y sus ministrosThis paper analyses constitutional responsibility of the government and sustains that it is political and juridical, of distant penal and administrative inspiration, and that the procedure used for persecution is impeachment in political trials, demonstrating a typical case of "political justice." Added to the constitutional responsibility of the government are the civil and penal responsibilities of the President and minister's public law

  15. Infecciones del tracto urinario

    Directory of Open Access Journals (Sweden)

    K. Andrés Wurgaft, Dr.

    2010-07-01

    Full Text Available La infección del tracto urinario (ITU, con sus múltiples presentaciones clínicas, está entre las enfermedades infecciosas más frecuentes, tanto en pacientes ambulatorios como hospitalizados. El uso del examen de orina completa y de urocultivo debe ser racional. La bacteriuria asintomática no debe ser buscada ni tratada, en parte porque esto favorece el desarrollo de bacterias resistentes a antibióticos. Distintos cuadros clínicos requieren de distintas duraciones de terapia antibiótica, y tanto el exceso de días de tratamiento como su falta deben evitarse. Se requiere investigación en la búsqueda de estrategias más efectivas para prevenir las ITU recurrentes y en el desarrollo de nuevos antibióticos orales para las ITU resistentes.

  16. Las cruces del olvido

    Directory of Open Access Journals (Sweden)

    Carla Fernandes

    2012-08-01

    Full Text Available Les tragiques événements du « mars paraguayen » ont signifié la disparition de l’espoir en la transition démocratique dans laquelle le pays s’était engagé depuis presque une dizaine d’années. Renée Ferrer, poète, dramaturge, auteur de plusieurs recueils de contes et de deux romans, consigne alors le témoignage poétique de ce drame national dans le recueil Las cruces del olvido (2001. Elle a auparavant publié d’autres textes qui peuvent rentrer dans la catégorie de la poésie sociale : c’est le cas en particulier de Viaje a destiempo (1989 dédié aux victimes de la dictature. Las cruces del olvido, dès son paratexte, insiste sur la fonction de témoignage que l’auteur souhaite assigner à ses vers et sur le rôle que ceux-ci peuvent jouer dans la transmission d’une mémoire collective. La voix d’un jeune disparu de ce « mars paraguayen », le dédoublement qu’il subit et travers lequel il évoque son entrée dans la mort et son absence du monde des vivants, rendent possible l’écriture de cette expérience de l’indicible qu’est la disparition.Los trágicos acontecimientos del «marzo paraguayo» significaron la desaparición de la esperanza en la transición democrática que el país está viviendo desde unos diez años. Renée Ferrer, poeta, dramaturga, autora de varios libros de cuentos y de dos novelas, escribe entonces el testimonio poético de ese drama nacional en su poemario Las cruces del olvido (2001. Ya había publicado antes textos que se pueden considerar como poesía social: es el caso de Viaje a destiempo (1989 dedicado a las víctimas de la dictadura. Desde el texto apertural, Las cruces del olvido potencia la función de testimonio que la autora desea conceder a sus versos y el papel que éstos pueden desempeñar en la transmisión de una memoria colectiva. La voz de un joven desaparecido del «marzo paraguayo», el desdoblamiento que sufre y a través del cual evoca su entrada en la

  17. Carta del editor

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    José Sánchez Gutiérrez

    2018-01-01

    Full Text Available La comunicación científica en México vive enormes retos ante la carrera de adaptar sus formas de comunicación a las nuevas tecnologías. No es tarea fácil convencerse de abandonar el papel y la imprenta para apostar por el código abierto. Sin embargo, esto es apremiante debido al retraso que se lleva en comparación con otras regiones.  Un reto muy evidente ha sido comprender el acceso abierto, reconociendo que este permite mayor visibilidad a la ciencia y que ayuda a evitar el plagio.  Razón por la que nos alegra que a partir del número 37, Mercados y Negocios cuenta con el ISSN electrónico, además del impreso

  18. Carta del Editor

    OpenAIRE

    Luis Eladio Proaño

    2015-01-01

    Henos aquí con un nuevo número de RIESED. Después de casi un año de ver la luz, y como lo anticipábamos en la carta del editor que acompañaba al número fundacional, hacer una revista electrónica no ha sido una tarea sencilla. Un año más tarde no podemos sino confirmar esa opinión.Gracias al decidido trabajo de los autores, revisores y miembros del equipo editorial hemos podido hacerlo. El proceso de revisión de los artículos ha merecido un cuidado, dedicación y tiempo especiales, que hicieron...

  19. Sonidos del Silencio

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    Luz Rodríguez Carranza

    2009-12-01

    Full Text Available La novela ha muerto, afirmaba Alberto Moravia, popularizada, anexada y banalizada por el cine, la televisión, la prensa, la sicología y la sociología. Para Carlos Fuentes en cambio - quien cita a Moravia en 1969 – « lo que ha muerto es sólo la forma burguesa de la novela, el realismo » (17. Basta un viaje rápido por la red para verificar, sin embargo, que la víctima goza de buena salud y que no está confinada en la cultura de masas o en las ciencias sociales : el modelo realista del siglo XIX – y particularmente la creación de tipos representativos de una época, sean éstos promediales o excepcionales - constituye aún la principal preocupación de los escritores y críticos literarios del siglo XXI.

  20. del consumidor mexicano

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    Nadia Huitzilin Jiménez Torres

    2013-01-01

    Full Text Available Pese a que el 80% de la población del mundo vive en mercados emergentes y países en desarrollo, como México, la investigación sobre el consumidor de estos países ha sido insuficiente. El objetivo de este estudio es determinar el perfil del consumidor mexicano en función de variables psicosociológicas como el etnocentrismo, la apertura cultural, el patriotismo, el colectivismo y las características demográficas. Con este propósito se recogió la información de una muestra de 274 consumidores, se realizaron un análisis factorial de sus principales componentes y un análisis cluster con el cual se aglomeró a los individuos en tres grupos con diferentes perfiles psicosociológicos y demográficos.

  1. del noroeste murciano

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    Ma. Luz Tudela Serrano

    2006-01-01

    Full Text Available En la Región de Murcia se está realizando un esfuerzo por aumentar la producción de energías renovables en cumplimiento de los objetivos de Kyoto establecidos para España. Paralelamente, la percepción social acerca de las mismas preocupa cada vez más. En este trabajo, los ciudadanos opinan ante la necesidad de promover el uso e implantación de energías renovables en varias poblaciones afectadas del noroeste. Emplazamientos idóneos, la conservación de los valores naturales y paisajísticos del entorno y las necesidades socioeconómicas de la zona se suman a un uso racional de estas energías y un desarrollo tecnológico paralelo para alcanzar un desarrollo sostenible.

  2. Lo siniestro del enigma.

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    Victoria Eugenia Diaz.

    1999-11-01

    Full Text Available En "El nacimiento de la filosofía griega", Giorgio Colli nos muestra una faceta tenebrosa del enigma. El dios Apolo, de naturaleza ilimitada, insondable, caprichosa, plantea al hombre enigmas que lo enfrentan con el sufrimiento y con la muerte. Allí, Edipo se confronta con enigmas enviados por el dios en los que se pone en juego su propia existencia. Tiempo después, en el transcurrir del siglo XX, reaparece una nueva forma de este dios arbitrario y arrogante: el desaparecedor de personas, ese inmoderado que impone moderación, borra con su acto un cuerpo, una imagen, un nombre, y formula un nuevo enigma siniestro que enfrenta otra vez al hombre con el dolor y con la muerte.

  3. Carta del Editor

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    Luis Eladio Proaño

    2015-01-01

    Full Text Available El aparecimiento del periodista digital y la educación superior en su formación, el cine indígena y la resistencia cultural, más los Grammy latinos, son temas protagónicos de este número. Se suman la prensa en el combate de piráticas corruptas, los errores de la comunicación del presidente URIBE en el referendo, el fútbol y las Relaciones Públicas en España, la libertad de prensa encarcelada, el Internet y la sociedad de la Información y México: profesiones emergentes para los comunicadores, completan la edición.

  4. Percepcion multisensorial del sabor

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    Charles Spence

    2010-12-01

    Full Text Available La investigación sobre la integración multisensorial de los estímulos auditivos, visuales y táctiles nos está ayudando a entender el funcionamiento de la percepción del sabor. Este conocimiento está teniendo ya un impacto sobre el diseño de alimentos y bebidas, desde los productos que compramos en un supermercado hasta aquellos que encontramos en los restaurantes con estrellas Michelin.

  5. Estado Nutricional del Yodo.

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    Hernando Vargas Uricoechea

    2015-06-01

    Full Text Available INTRODUCCIÓN: Los Desórdenes por Deficiencia de Yodo son un problema serio de salud pública, con cerca de 2 mil millones de personas a riesgo de padecerlos, pudiendo causar bocio neonatal, cretinismo, retardo mental, hipotiroidismo, entre otros. Estos desórdenes son aún prevalentes, y en algunos casos los esfuerzos para su erradicación se han traducido en aumento del riesgo de exceso poblacional de yodo y autoinmunidad tiroidea. En Colombia, se desconoce el estado real de yodo en la población. OBJETIVOS: Determinar la mediana de la yoduría en población escolar, y de los hábitos del consumo de sal, función y parámetros de autoinmunidad tiroidea, y cociente intelectual. MATERIALES Y MÉTODOS: Estudio basado en la comunidad, de corte transversal. Se evaluaron las variables sociodemográficas, la frecuencia de bocio y los niveles de TSH, anti-TPO, anti-Tg, anti-TSHR, yoduria, test de factor G de Cattell, y hábitos del consumo de sal. RESULTADOS: El consumo de sal promedio persona/día fue de 18,13 g. El 37,9% presentó bocio. 36,1% tenían un valor límite en el cociente intelectual. La mediana de yoduria fue de 510,3 μg/L. El 42,75% tuvo anti-TPO positivos, y el 2,87% anti-Tg positivos. El 10% presentó niveles de TSH elevados. CONCLUSIÓN: En escolares de zona urbana, hay un exceso en la mediana de yoduria, pudiendo explicarse por el alto consumo de sal. La alta prevalencia de autoinmunidad tiroidea y bocio, junto al alto nivel de la TSH, puede ser consecuencia del exceso en la ingesta de sal y de otros factores medioambientales/ hereditarios.

  6. El lenguaje del pensamiento

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    Alberto Andreu Marín

    2017-09-01

    Full Text Available ¿Somos capaces de interpretar las señales eléctricas que genera nuestro cerebro cuando estamos pensando? Lo que a priori parece ciencia ficción comienza a ser factible gracias a los avances recientes en técnicas de registro cerebral y en aprendizaje automático. Nos encontramos en el inicio de una nueva era en lo que al conocimiento del cerebro se refiere.

  7. Fundamentos del saber administrativo

    OpenAIRE

    Paola Podestá Correa; Juan Carlos Jurado Jurado

    2005-01-01

    El presente texto tiene por objetivo delimitar, de manera general, algunos de los conceptos más importantes del saber administrativo; en primera instancia, práctica administrativa y saber administrativo. Estos conceptos están ligados con los que en el texto se denominan fundamentos de la administración, estableciendo consensos sobre algunas expresiones comunes en el lenguaje administrativo, y contribuyendo a la comprensión de estos temas para los estudiantes de los primeros niv...

  8. Carta del Editor

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    Jorge Aguirre

    2015-01-01

    Full Text Available La crisis de la prensa Argentina a efecto del mal manejo de la economía y las finanzas, ocupa el tema central. Pasa revista a tres temas de actualidad: El aumento de cobertura y difusión de la prensa gratuita; los esfuerzos de los "viejos" diarios por cambiar de apariencia y el caso del diario estadounidense TODAY que hace veinte años dio un cambio revolucionario en la forma de hacer periodismo diario. Se analizan también temas como: el "carisma" de los líderes actuales, los acuerdos entre los medios de comunicación y el gobierno de México para la difusión de planes y programas oficiales y el rol de los medios en el proceso de establecimiento del ALCA. Agrega el tema controversial sobre la Ley de radiodifusión privada, vigente desde la época de la dictadura pinochetista. En este mismo campo de la Radio otro artículo señala las normas para "contar las noticias" con impacto e interés.

  9. Carta del Editor

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    Jorge Mantilla Jarrín

    2015-01-01

    Full Text Available En este número, el módulo Dibujos Animados, recoge las experiencias del primer curso realizado por el CIESPAL con apoyo de la UNICEF sobre la producción de programas educativos y culturales que utilizan este recurso como una opción comunicacional. Se trata de nuevas tecnologías aprovechadas en Cuba y que pueden ser aplicadas en nuestros países. El módulo relativo al medio ambiente habla del periodismo ecológico con importante desarrollo en América Latina, tema de actualidad que requiere preocupación por parte de los medios de comunicación. Incluye entrevistas a Gunter Grass y Jesús Polanco. Gabriel Alba adentra a los lectores en una novedosa forma de usar las computadoras. En el módulo Debate se trata la Economía, cultura y comunicación; La publicidad vía televisión, La evolución del merchandising en las novelas brasileñas ¿Exigir Ética solo al periodista?

  10. Los felinos del canciller

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    Marco Palacios

    1988-01-01

    Full Text Available En la introducción a una de las obras más influyentes de la historiografía colombiana de nuestros tiempos, el autor, Luis Ospina Vásquez, advierte ciertas dificultades inherentes al oficio de historiar la economía: "Otros aspectos del tema son difíciles de tratar por otros motivos: no se puede citar, entre las causas del difícil adelanto económico de cierta región nuestra, llamada por la generosidad de la naturaleza a una gran riqueza; el hecho de que en ella la política se haya reducido con frecuencia a una pugna entre grupos de hampones[...] Y en el supuesto de que se pudiera dar tratamiento adecuado a lo que, al fin y al cabo, es cosa tangible, no muy difícil de percibir y de describir, faltaría aun dar entrada a un elemento sumamente importante, pero este sí difícil de captar y de transmitir: la 'atmósfera', las 'atmósferas' sucesivas del país y sus regiones, elemento esencial en la historia de la evolución económica.

  11. El Museo del Oro

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    Efraín Sánchez Cabra

    2003-09-01

    Full Text Available El 22 de diciembre de 1939 el Banco de la República compró un objeto de oro de 777,7 gramos de peso y 23,5 centímetros de altura que dio origen al Museo del Oro. Era un poporo quimbaya, pieza maestra de la orfebrería prehispánica. Un objeto bello bello que levanta su bruñido vientre globular y su cuello coronado por cuatro cuerpos esféricos sobre una exquisita base de filigrana fundida, y parece flotar en un espacio propio. Quien lo contempla no puede menos que asombrarse, deleitarse y sentir admiración por sus artífices. Detrás de la compra del poporo había una clara preocupación oficial por proteger una riqueza que comenzaba a entenderse como parte del patrimonio nacional. Esta motivación se pone de manifiesto en una serie de documentos relativos a su adquisición.

  12. Llanto del adulto

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    Alegría Majluf

    2013-09-01

    Full Text Available Se presentan los resultados de un primer estudio transcultural del llanto del adulto que comprende 30 países, entre los que se encuentra el Perú. Vingerhoets et al. (1997 de la Universidad de Tilburg, Holanda, analizan las causas, tendencia y frecuencia del llanto, emociones y sentimientos que inducen al llanto, diferencias y similitudes entre los países y los sexos. Los autores encuentran que las mujeres tienden a llorar con más frecuencia e intensidad que los varones, advirtiendo que en algunos países las mujeres establecen mayor relación entre la tendencia al llanto y el ciclo menstrual que en otros. The results of a first cross-cultural study on adult crying in 30 countries including Peru are presented. Vingerhoets et al. (1997 from the University of Tilburg have analyzed motives, tendencies and frequency of crying, emotions and feelings that provoke crying, as well as differences and similarities among countries and sexes. Results show that women have a tendency to cry more frequently and intensively than men. It has also been noted that, in certain countries, there is a link between crying in women and their monthly period.

  13. Carta del Editor

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    Luis Eladio Proaño

    2015-01-01

    Full Text Available Artículo de fondo es un ejemplo de una campaña exitosa de Relaciones Públicas realizada para rescatar a Medellín para el turismo, ahora herida de muerte por el narcotráfico. Reinicia el tema sobre el cine, recordando el aniversario del nacimiento de Luis Buñuel. Y sobre el Nuevo Orden Internacional de la Información, Luis Ramiro Beltrán da respuesta a las múltiples interrogantes planteadas en la controversia surgida alrededor del tema. Se da a conocer cómo era el periódico de ayer, de hoy y del futuro frente al desafío de las nuevas tecnologías. Se señala el camino para hacer publicidad en Internet. El Internet y la radio nuevos actores para un mismo mercado. Y para los interesados en la investigación se trata cómo y cuándo hacer sondeos flash y se cierra con el lenguaje periodístico cuándo el dequeísmo es lícito.

  14. comportamiento del consumidor

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    Erico Rentería Pérez

    2006-01-01

    Full Text Available En este artículo se analiza el posicionamiento exitoso de los profesionales, particularmente los jóvenes, a partir de las nuevas realidades del mundo y del mercado laboral, así como la empleabilidad como constructo, estrategias posibles y, finalmente, una discusión sobre falacias y realidades de discursos sobre mercado de trabajo profesional. La reflexión se liga a dos investigaciones, y a redes de discusión en Brasil y Colombia, que reflexionan sobre las implicaciones y requerimientos estratégicos que marcan el ingreso o permanencia en el mercado de trabajo de profesionales jóvenes, y se reconoce que esto afecta a otros tipos de profesionales. La investigación de Rentería (2006ª sobre Empleabilidad arroja información sobre las dos primeras partes. La de Enríquez y Rentería (2006 sobre Estrategias de aprendizaje y empleabilidad informa sobre la tercera. Apoyan la discusión elementos de psicología y comportamiento del consumidor. Se discute la inclusión social y calidad de vida por el trabajo.

  15. Carta del Editor

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    Luis Eladio Proaño

    2015-01-01

    Full Text Available Abre la revista una retrospectiva de la crisis económica, política y social en la que se precipitó Argentina (2001-2002 y el tratamiento que dieron los medios a esta situación. En opinión se describe el significado de los nuevos paradigmas de Internet como: interactividad, personalidad, multimedialidad, hipertextualidad, actualización, abundancia y mediación. Responde a la cuestión de ¿cómo y cuándo en la prensa latinoamericana sigue imperando la prensa amarilla? Recoge en un artículo los factores que más inciden en el éxito o fracaso de una campaña política. Aborda la implantación de una nueva moneda única en la Unión Europea y sus incidencias. Destaca las consecuencias vividas por México tras el ataque terrorista del 11 de septiembre 2001 y analiza el tratamiento que los medios dan a las informaciones procedentes del Tercer Mundo en Europa. Contesta a la pregunta inquietante sobre las posibilidades del liberalismo económico para garantizar o contrarrestar la libertad de prensa y por último se aclara los mitos y realidades que se han tejido alrededor de Windows XP de Microsoft.

  16. Inestabilidad compleja del codo

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    Héctor Gabriel Díaz Carrillo

    2014-08-01

    Full Text Available La inestabilidad compleja del codo es de reciente descripción y controversial en sus resultados; es el estado que se deriva del daño estructural y funcional, producido por la incongruencia de las superficies articulares y las estructuras ligamentosas que estabilizan el codo. Se realizó un estudio descriptivo prospectivo, en el período comprendido entre enero de 2011 y abril de 2013, en una muestra no probabilística de ocho pacientes (diez codos, seleccionados según criterios de inclusión y exclusión. Los objetivos fundamentales del estudio fueron: la actualización de conocimientos para el manejo de la enfermedad y la caracterización de los resultados obtenidos en los afectados por esta dolencia que fueron operados en el Hospital Dr. Ernesto Guevara de la Serna de la provincia de Las Tunas. Se analizaron los datos mediante técnicas estadísticas descriptivas y se realizó la evaluación clínica y radiográfica de los lesionados. El tratamiento se ejecutó según los hallazgos y consistió en: reparación ligamentosa, actuación sobre las partes óseas dañadas y colocación de osteosíntesis diversas. La edad promedio fue de 39,2 años y predominó el sexo masculino. A todos se les practicó reparación ligamentosa, siete cupulectomías y seis aplicaciones de cerclajes anti-distractores. Existieron dos reluxaciones y una sepsis local. La amplitud de movimientos fue aceptable dentro del rango compatible, con una buena función ergonómica; de acuerdo a las comparaciones bibliográficas actualizadas que se realizaron. La fijación y reparación de los estabilizadores del codo brindan buenos resultados funcionales. La sistematización en el manejo de la enfermedad, la detección de complicaciones y el arsenal terapéutico disponible son factores a tener en cuenta

  17. Nuevos usos del cemento

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    Páez Balaca, A.

    1977-04-01

    Full Text Available In this article, the evolution of the different systems of transporting and storing submarine oil and its by-products (petroleum gas and natural gas, is dealt with stressing the importance of the use of concrete boats. Due to the high cost of oil pipelines, we have passed from tanks built on land to prestressed concrete tanks which can be berthed at great depths or anchored to the bottom to keep them afloat, it being possible to unmoor them for transferring them. Transporting and storing liquated gas leads US to see the advantages of prestressed concrete over steel, as the latter becomes brittle at low temperatures, whereas the former's strength increases. The different forms and possible sections are analyzed, stressing the great importance of the solution of the double concrete hull with pearlite insulation. Finally, a study is made of «light concretes », not the classical types used as thermal and acoustic insulation, but the semi-heavy ones made with expanded clay, high quality sand and P-450 cement, which technique is not yet as developed in Spain at might be wished.En este artículo se trata la evolución de los distintos sistemas de transporte y almacenamiento del petróleo submarino y sus derivados (gas de petróleo y gas natural, resaltando la importancia del uso de barcos de hormigón. Debido al gran coste de los oleoductos, se ha pasado de los tanques construidos en tierra firme a los depósitos de hormigón pretensado que pueden estar fondeados a gran profundidad o anclados al fondo para mantenerlos flotantes, existiendo la posibilidad de poder desamarrarlos para su traslado. El transporte y almacenamiento del gas licuado nos hace ver las ventajas del hormigón pretensado sobre el acero, pues éste se vuelve quebradizo a bajas temperaturas, mientras aquél aumenta su resistencia. Se analizan las diferentes formas y secciones posibles, destacando la gran importancia de la solución del doble casco de hormigón con

  18. Enfermedad Diverticular del Colon

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    Gonzalo López Escobar

    1991-06-01

    Full Text Available

    Los divertículos del colon han sido reconocidos por varios observadores desde hace más de un siglo, pero en su mayor parte se trataba de casos aislados, hoy se la considera como la enfermedad del siglo XX, la de la era moderna y de los países industrializados y de avanzada tecnología (5,18,33.

    Según el diccionario de la Real Academia Española (11, divertículo, del latín, diverticulum, quiere decir desviación de un camino; y desde el punto de vista anatómico, apéndice hueco y terminado en fondo de saco. (Gráfica No. 1.

    Goligher (17 lo define como la “posada al borde del camino, probablemente un lugar, a menudo, de mala reputación”.

    Historia

    Según Hackford (18, el proceso fué descrito brevemente por Littre a comienzos del siglo XVIII; pero se le atribuye a Cruveilhier la primera descripción como proceso patológico en 1849, quien, además, mencionó: “encontramos, no rara vez, en el sigmoide, entre las bandas de fibras musculares longitudinales, una serie de pequeños tumores piriformes oscuros, que están formados por hernias de la mucosa a través de brechas en la capa muscular” (17.

    Fleischman en 1815 hizo la primera observación de la enfermedad y empleó el término divertículo (45.

    Rokitansky en 1.849, habló de una enfermedad adquirida y consideró que su causa consistía en la constipación (45.

    Virchowen 1853 describió la perisigmoiditis (45.

    En 1859 Sidney Jones informó de una fístula colo-vesical debida a diverticulitis (5,45.

    Loomis en 1870 describe una peritonitis como resultante de una diverticulitis (45.

    En 1877 Ball describió la anatomía patológica de la enfermedad y presentó dos casos de fístula colovesical debidas a diverticulitis (9. Cripps en 1.888 popularizó la colostomía de desviación como tratamiento para la fístula colovesical(18...

  19. Max Weber o el enigma emocional del origen del capitalismo

    OpenAIRE

    EDUARDO BERICAT ALASTUEY

    2001-01-01

    Se analiza el trabajo clave de Max Weber, La ética protestante y el espíritu del capitalismo, desde la perspectiva de la Sociología de las Emociones. Aunque la inclusión de las emociones de los fenómenos sociales es clave para entender la idea de Weber sobre el dogma de la predestinación, los sociólogos han trivializado el papel de la emoción. Tras detallar la creencia de Weber en que el espíritu del capitalismo parte del conocimiento de que el destino del hombre está predeterminado (la ética...

  20. Sobre el significado del descubrimiento del gen FOXP2

    OpenAIRE

    Longa Martínez, Víctor Manuel

    2006-01-01

    El reciente descubrimiento del gen FOXP2 ha ofrecido la primera evidencia clara de la base genética del lenguaje, mostrando una correlación inequívoca desde la perspectiva genética entre una versión mutada de F0XP2 y los trastornos lingüísticos de diferente tipo sufridos por una familia inglesa, conocida como KE. El objetivo central del presente trabajo es discutir diferentes aspectos relacionados con tal descubrimiento; especialmente, la discusión del significado de FOXP2 con ...

  1. Competitividad sectorial internacional. Caso: sector del cuero y del calzado

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    Diana Carolina Villegas Álvarez

    2007-01-01

    Full Text Available El presente escrito se origina en un trabajo de investigación cuya pretensión fue indagar sobre el nivel de competitividad internacional (C.I, del sector del cuero y del calzado colombiano, mediante la aplicación de indicadores que, a partir de la información estadística de las variables de comercio exterior permiten establecer ciertas relaciones que dan cuenta de la importancia del producto en los mercados de los países de la Comunidad Andina de Naciones (CAN, seleccionados para la comparación.

  2. La impronta del nuevo mundo

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    Rodrigo Lagos Vergara

    1992-05-01

    Full Text Available Cuando nos aprontamos a conmemorar el quinto centenario del Nuevo Mundo, cabe hacer algunas reflexiones acerca de nuestro continente a la luz del lenguaje propio de las artes y la arquitectura a través del tiempo. Hablamos del Nuevo Mundo en la medida que aceptamos, por una parte, la concepción del nuevo espacio generado a partir del encuentro de dos culturas, la precolombina americana y la propiamente europea llegada principalmente a través de España, y, por otra parte, aceptando también que el nuevo continente resulta ser la pieza clave que ayuda definitivamente a configurar un nuevo cosmos que revela al mundo su otro extremo y aquella parte que manifiesta la totalidad en la certeza de que la tierra es un planeta.

  3. Efectos colaterales del voto preferente

    Directory of Open Access Journals (Sweden)

    Luis Diego Brenes Villalobos

    2012-07-01

    Full Text Available El artículo describe la multiplicidad de potenciales efectos que la implementación del voto preferente podría acarrear en el ordenamiento jurídico y el sistema de partidos. La primera parte del análisis se dirige a caracterizar y definir el voto preferencial. En segunda instancia, el estudio comprenderá la revista de los efectos colaterales del voto preferente como modalidad de votación.

  4. EFECTO DE LA VEGETACIÓN EN LA INTERCEPCIÓN DE LA PRECIPITACIÓN EN LA PRECORDILLERA DE LA REGIÓN DEL MAULE, CHILE

    Directory of Open Access Journals (Sweden)

    O. S. Vallejos-Barra

    2010-01-01

    Full Text Available En este estudio se comparó el comportamiento de un bosque secundario de Roble-Hualo, donde las especies predominantes son Nothofagus obliqua y Nothofagus glauca y una plantación de Pinus radiata D. Don de 12 años de edad, en el proceso precipitación - intercepción. El estudio se desarrolló en la Estación Experimental El Picazo, comuna de San Clemente, Región del Maule, Chile, entre el mes de julio de 2007 a julio de 2008, en dos microcuencas vecinas de dimensiones reducidas con condiciones similares de suelo, exposición y pendiente pero que diferían en la cobertura vegetal. Se caracterizó la vegetación de cada microcuenca y se establecieron indicadores de densidad de parcela. Los indicadores de la cobertura nativa superaron ampliamente a los de las coberturas exóticas. Para registrar la precipitación se instalaron dos pluviógrafos del tipo Hobo en cada microcuenca. Equidistante de ellas se ubicó otro pluviógrafo sin cobertura vegetal. Se registraron 21 tormentas caracterizando temporal y espacialmente el comportamiento de la precipitación abierta y bajo dosel. Los resultados indican que pese a tener diferencias numéricas las coberturas vegetales, éstas no se transforman en diferencias estadísticamente significativas. Además se observó que la intercepción depende en mayor medida de la arquitectura de copa, distribución espacial de los árboles y tipo de hojas, que de la cantidad de árboles por parcela.

  5. El movimiento del software libre

    OpenAIRE

    Prudencio Óscar Mochi Alemán

    2002-01-01

    El objetivo de este trabajo es describir el surgimiento y desarrollo del movimiento de software libre. Para ello se analizan algunas características importantes que dan cuenta del origen y desarrollo del mismo, así como de sus momentos más críticos y sus tensiones, sus desafíos y sus retos. Otra de las grandes inquietudes de este trabajo, es intentar descifrar cómo el movimiento del software libre y Linux, en su versión más conocida, sobrevivieron y se afirmaron hasta llegar a ...

  6. Analisi del decadimento $W -> \\tau \

    CERN Document Server

    Coscetti, Simone

    Questo lavoro di tesi si e' svolto nell'ambito dell'esperimento CMS a LHC, ed in particolare verte sullo studio delle strategie di identificazione off-line del leptone tau, atteso tra i prodotti di decadimento del bosone di Higgs, cosi' come di altre particelle previste in altri modelli teorici. Il canale utilizzato per testare la procedura di identificazione del tau e' il decadimento semileptonico del bosone vettore W. Infine, sulla base dei risultati ottenuti viene presentata una stima quantitativa della sezione d'urto di produzione pp-> W + X

  7. El pie del adulto mayor

    OpenAIRE

    Parodi García, José Francisco

    2005-01-01

    Acta Médica Peruana es una publicación del Colegio Médico del Perú El estudio del pie y sus patologías es un capítulo muy importante de la Geriatría. Las patologías del pie no escapan las características comunes de muchos síndromes geriátricos como son el ser asumidos como "normales para la edad", ser poco valorados, menospreciados, no tratados, con gran impacto sobre la salud en general y la calidad de vida.

  8. El maestro del Pavo Real

    OpenAIRE

    Montalvo Martín, Francisco J

    2013-01-01

    Este trabajo pretende hacer una primera aproximación al Maestro del Pavo Real, un platero barcelonés del siglo XIX que usó como marca personal la silueta de un pavo real visto de frente con la cola desplegada y todo ello dentro de un círculo. Este trabajo pretende hacer una primera aproximación al Maestro del Pavo Real, un platero barcelonés del siglo XIX que usó como marca personal la silueta de un pavo real visto de frente con la cola desplegada y todo ello dentro de un círculo.

  9. LIDERAZGO VISIONARIO: CENTRO DEL CONOCIMIENTO

    Directory of Open Access Journals (Sweden)

    Rafael Pérez Uribe

    2013-07-01

    Full Text Available El gestor del conocimiento es el ser humano. En el mundo como en las empresas es el centro de la destrucción y la creación del conocimiento. Por esta razón en las empresas se deben generar los escenarios adecuados para revertir el conocimiento de las personas y convertirlo en patrimonio de las organizaciones. El papel del líder es vital para la construcción de escenarios adecuados para que los trabajadores se conviertan en auténticos gestores del «knowledge» y esto permita que las organizaciones sean entes permanentes de aprendizaje continuo.

  10. Las aristas del racismo

    Directory of Open Access Journals (Sweden)

    Fredy Rivera Vélez

    2000-01-01

    Full Text Available En el presente trabajo se estudia un ámbito que normalmente se esquiva y se enmascara: Las prácticas racistas. Esta evasión del tema se da en diferentes planos discursivos, y es una práctica, cada vez más frecuente en América Latina, pues aquí se hace de la integración étnica uno de los ejes centrales de la construcción de sus relaciones identitarias y políticas. Se propone, entonces, este trabajo develar la naturaleza y el movimiento de prácticas racistas presentes no sólo discursivamente, en la práctica política, en la práctica laboral, sino que también están presente en nuestra vida cotidiana, bajo nuevas formas y contenidos que se distancian del racismo tradicional e incorpora una nueva gramática racista, una suerte de racismo moderno, no basado en el fenotipo o características físicas como elemento central, sino en un racismo basado en la diferencia cultural, lo cual plantea un plano más excluyente, pues en este planteamiento el “objeto de racismo” no es un objeto de racismo limitado, como en el racismo tradicional, en el cual siempre es utilizado por quien practica el racismo; en el racismo contemporáneo se pretende una ruptura completa y una exclusión total del otro.

  11. Etiche del paesaggio

    Directory of Open Access Journals (Sweden)

    Massimo Venturi Ferriolo

    2015-11-01

    Full Text Available L’etica riflette sui rapporti fra uomo e ambiente. Indaga l’azione dell’uomo. Svela la sua visione della vita e il mondo possibile e accoglie in sé un complesso di norme morali e di costume che identificano un preciso comportamento nella vita di relazione. Si riferisce all’agire dell’individuo in una struttura sociale che lo comprende. Siamo alla ricerca di un’essenza del paesaggio indipendente dalla mera pittura, dalla rappresentazione, dall’immagine sentimentale: dalla natura sia ideale che reale. Prendere coscienza della cosa in sé, anche nei suoi aspetti ideali, significa comprenderne la complessità. Possiamo leggere quindi ogni paesaggio come realtà etica, risultato dell'operosità dell'uomo nella natura, ambito complessivo della vita: nel significato peculiare di progetto del mondo umano, che parte da lontano, da quando l'uomo ha incominciato a trasformare il proprio ambiente naturale per creare i luoghi dell'abitare, modellati con la mano e con lo spirito. La conoscenza dei paesaggi in tutta la loro complessità, a partire dal mondo antico, diventa quindi un nostro obiettivo. Questo significa superare, se non addirittura rovesciare, alcuni luoghi comuni consolidati e storicizzati: la teoria secondo la quale il paesaggio, nella sua dimensione estetica, sarebbe un'invenzione della modernità; il collegamento tra la moderna pittura di paesaggio e la nascita dei concetti estetici; la confusione tra natura e paesaggio, frequente nelle concezioni ecologico- ambientaliste; la tesi lessicale della nascita della coscienza del paesaggio, legata all'esistenza di una parola specifica che lo indichi. 

  12. del paradigma comprensivo

    Directory of Open Access Journals (Sweden)

    María Luisa Bacarlett Pérez

    2008-01-01

    Full Text Available A partir de la distinción planteada por von Wright en su texto ya clásico Explicación y comprensión, se analiza la obra de Giambattista Vico (1668-1744 a la luz de su crítica desarrollada hacia Descartes y la distinción que realiza en tre "crítica" y "tópica". No es aventurado decir que en la propuesta viquiana la actividad propia de la tópica, ligada al uso del lenguaje, la retórica y la elocuencia, se acerca más aquello que von Wright ubica dentro del "paradigma comprensivo"; mientras que la crítica, identificada con el método cartesiano, privilegia la abstracción, la deducción lógica y el análisis matemático; es decir, todo aquello ligado al conocimiento de la naturaleza. La gran diferencia en tre tópica y crítica radica, al final, en el criterio de verdad propio de cada perspectiva: mientras la crítica encuentra la verdad en la exterioridad del mundo natural, en algo que los hombres no hacen; en cambio, la única forma de verdad en el terreno de la tópica es como "verdad hecha" o "verum factum"; es decir, la verdad que nosotros mismos hacemos como agentes históricos, lingüísticos, creadores de cultura, de vida política y social.

  13. La era del youtuber

    OpenAIRE

    Sánchez Arufe, Irene

    2017-01-01

    En el trabajo se analizan los cambios que ha provocado y la recuperación que ha tenido la red social YouTube en la sociedad actual, poniendo como antecedentes la aparición de Internet y el auge de las nuevas redes sociales. También se examinan la figura del youtuber como la creación de una nueva profesión y los aspectos económicos y sociales de este nuevo trabajo. Grado en Publicidad y Relaciones Públicas

  14. El desarrollo del emprendedor

    OpenAIRE

    Arco Juan, Francisco Javier del

    2010-01-01

    En este trabajo pretendemos abordar el desarrollo de las competencias y de las cualidades del emprendedor. Para ello analizaremos como mediante el trabajo en equipo, el liderazgo y la toma de decisiones a la hora de elaborar un Plan de Negocio, el alumno desarrollo todas estas competencias básicas. Además, por supuesto, de la capacidad de emprender un negocio a través de las herramientas básicas para la puesta en marcha de un negocio. No data (2010) UEM

  15. Peter Carravetta, Del postmoderno.

    Directory of Open Access Journals (Sweden)

    Alessandro Carrera

    2010-08-01

    Full Text Available Peter Carravetta, professor of “Italian and Italian American Studies” at SUNY Stony Brook, with an Italian and American education, has put together in his massive Del postmoderno possibly the most complete critical review so far of American academic production from the 1970s to the present. “Postmodern” is the key word of the cultural turn that took place between the 1950s and the 1970s only to meet its death, in Carravetta’s opinion, on September 11, 2001, when the shortlived illusion that h...

  16. A favor del Plagio

    OpenAIRE

    Manuel Arranz

    2007-01-01

    Yo no tengo nada contra el plagio. Ustedes, como lectores, seguramente tampoco. Bueno, tal vez prejuicios. Es lógico que los tengan con tanto artículo condenándolo. Hasta ahora, que yo sepa, nadie ha escrito para defenderlo. Los que sí tienen algo, parece ser, son los autores. Una minoría al fin y al cabo. Ya sé que hay que respetar el derecho de las minorías, pero el asunto del plagio, como tantos otros, deberíamos examinarlo con más detalle, y preguntarnos, por ejemplo, ¿por qué se molestan...

  17. El mundo del postfordismo.

    OpenAIRE

    Lipietz, Alain

    2012-01-01

    La crisis de la relación salarial fordista ha conducido a diferentes regímenes salariales aún en bloques continentales integrados. Característica que se suma a la transformación jerárquica de las economías mundiales ocasionadas por el avance competitivo de los nuevos países industrializados y por la concentración de las relaciones económicas internacionales por bloques continentales. Tales son las características básicas del mundo económico internacional posterior a la guerra fría.Este artícu...

  18. emergencia del trabajo liberado

    Directory of Open Access Journals (Sweden)

    Rocío Gómez Z.

    2008-01-01

    Full Text Available Este ensayo sugiere que habría una inestimable conexión entre el compromiso subjetivo y emocional de los jóvenes usuarios de Internet, que invierten tiempo y deseo en realizar un conjunto variado de obras menores (correos electrónicos, imágenes de sí mismos en Facebook, trozos de música, mantenimiento de la bitácora en la Red, y los malestares del bienestar urbano. Estas obras menores encarnan y objetivan las demandas de trabajo liberado -frecuentemente reprimidas, pospuestas, administradas o reguladas-, que algunos de los nuevos repertorios tecnológicos canalizan y movilizan vigorosamente.

  19. Funciones sociales del folclore

    Directory of Open Access Journals (Sweden)

    Alberto Londoño Álvarez

    1969-07-01

    Full Text Available Con el objeto de estudiar los principales aspectos sociológicos del folclore, empecemos con uno de los problemas más significativos, cual es el análisis de sus funciones que cumple en una sociedad. se trata de un asunto perteneciente al sociólogo, quien, con el propósito de mostrar al folclórogo, que su investigación no es única, porque se refiere a un hecho que pertenece al grupo de los fenómenos sociales.

  20. Trastorno del espectro autista

    OpenAIRE

    Mendoza Mendoza, María Yésica

    2012-01-01

    Se explica qué es el autismo, sus causas, tipos, síntomas, tratamiento, detección temprana, técnicas y programas específicos de intervención. A continuación, se analiza el resultado de unos cuestionarios pasados a los padres que tienen hijos con autismo para identificar y conocer el impacto de dicho trastorno en los miembros que conviven con el paciente diagnosticado de autismo y otras comorbilidades asociadas: ansiedad, presión psicológica y trastornos del estado de ánimo

  1. Les Malalties dels cereals

    OpenAIRE

    Puiggrós i Jové, Josep Maria

    1989-01-01

    En aquest treball es fa una descripció de les principals malalties dels cereals que han estat trobades a Catalunya. Agrupant-les segons ataquin la fulla i espiga: oïdi, rovells, septòries, Rhynchosporium, Helminthosporium, i virus; al coll i tija: Cercosporella, Ophiobolus, Rhizoctbnia i Fusarium o bé les que vénen de la llavor: carbons, càries i Helminthospbrium. A part de la descripció, hom fa esment de les observacions efectuades els darrers anys en els diferents indrets de...

  2. La inutilidad del etnocentrismo

    OpenAIRE

    Vanegas Betancourth, Paula C.

    2017-01-01

    El etnocentrismo como filosofía de poder en el mundo occidental. Ha evitado el exaltamiento de las mezclas culturales como opción de vida. Dándole a las minorías un lugar en los suburbios del conocimiento y de la ciencia. La exclusión de las fuentes de conocimiento primitivo por el hombre contemporáneo. Le permite la sensación de dominio sobre el mismo hombre y sobre la naturaleza. La industrialización le permitió al hombre. Como lo menciona David Dickson: « El supuesto dominio sobre la natur...

  3. Catàleg dels Miridae (Heteroptera) del Massís del Garraf

    OpenAIRE

    Goula Goula, Marta

    1989-01-01

    Per a la redacció d'aquest catàleg, s'aporten dades d'observació pròpia al llarg dels anys 1980-1984, així com les troballes publicades per CUNI (1889a,1889b,1889c,1891) i per RIBES (1978a,1978b,1980,1984). Totes aquestes observacions s'han fet en localitats del Massis del Garraf, que será objecte d'una curta descripció.

  4. LAS NEURONAS DEL SEPTUM LATERAL MODIFICAN LA ACTIVIDAD DE LAS NEURONAS DEL NUCLEO TUBEROMAMILAR DEL HIPOTALAMO

    OpenAIRE

    FARIAS RODRIGUEZ, PAULA ANDREA; FARIAS RODRIGUEZ, PAULA ANDREA

    2012-01-01

    El septum lateral (SL), es un núcleo del cerebro anterior, que, procesa la información sensorial afectiva procedente del hipocampo y dirige sus respuestas, importantes para la supervivencia, hacia las zonas del hipotálamo importantes para la motivación, como lo es el núcleo tuberomamilar del hipotálamo (TMN). El TMN contiene las neuronas histaminérgicas en el cerebro, la cual relacionamos con la vigilia y alerta en conductas motivadas y así puede dirigir y reforzar el comportamiento. El TM...

  5. La superación del modelo del ángel del hogar:

    OpenAIRE

    Hurtado Muñoz, Mónica

    2013-01-01

    La Tesis Doctoral titulada "La superación del modelo del "ángel del hogar". Recuperación de la escritora Leonor Canalejas y Fustegueras (1869-1945)" aborda, en primer lugar, un análisis sociológico de las circunstancias que rodearon a la mujer española en el cambio de siglo en el ámbito social y educativo, en un intento de esclarecer las características propias del contexto en el que la mujer accede a la intelectualidad en general y a la literatura en particular. Esta parte concluye que la cr...

  6. RASGOS GEOGRÁFICOS DEL VALLE DEL RIO AGRIO INFERIOR.

    Directory of Open Access Journals (Sweden)

    Celia Torren

    1993-12-01

    Full Text Available El presente artículo es una síntesis del trabajo "Rasgos Geográficos del Valle del Río Agrio Inferior, el cual es un estudio de base para el conocimiento de la geografía de la región: - apoyando el esfuerzo que está realizando la población del área para lograr una identidad propia y una definitiva integración al contexto provincial; - aportando al proyecto "Rescate Arqueológico en Quili Malal, Neuquén" (subsidiado por CONICET y UNESCO, cuya dirección está a cargo de la profesora Susana Rodríguez de la U.N.C., a través de la confección del mapa geomorfológico del área; y - contribuyendo a los estudios que resultan necesarios ante la construcción de una obra hidroeléctrica de la magnitud de "El Chihuido I", emprendimiento que será llevado a cabo por Agua y Energía eléctrica de la Nación. Los límites del área estudiada fueron establecidos teniendo en cuenta el área del valle inferior del Río Agrio que será completamente inundada por el futuro embalse de la represa "El Chihuido I", a emplazarse 5,5 Km aguas abajo de la confluencia de los ríos Agrio y Neuquén. Además de esta área de afectación directa se tomó también una zona de perilago estrechamente vinculada a la anterior. De esta manera los límites este y oeste quedaron establecidos por la confluencia de los ríos antes mencionados y la localidad de Bajada del Agrio, respectivamente.

  7. del cuerpo femenino

    Directory of Open Access Journals (Sweden)

    Betina Hillesheim

    2005-01-01

    Full Text Available Este artículo discute cómo las prácticas de salud dirigidas a las mujeres construyen determinadas significaciones sobre la salud y el cuerpo femenino, comprendiendo que las prácticas en salud producen determinadas formas de ser, vivir y sentir, y constituyen modos de ser mujer y de ser hombre. Se presentan los datos de una investigación desarrollada en un servicio académico de salud, con mujeres que se realizaron exámenes de prevención de cáncer de útero y mama, entre mayo y diciembre del 2002. La recolección de datos se realizó mediante observaciones de las prácticas de la salud y entrevistas con las usuarias del servicio. En términos teóricos, el punto de referencia fueron los estudios feministas, especialmente autores(as cuyas teorizaciones son postestructuralistas. Se espera que este estudio contribuya con la reflexión sobre las prácticas de salud dirigidas a las mujeres, posibilitando una ampliación sobre lo que se entiende por femenino y, dando espacio a otras formas de ser y de estar en el mundo, además de aquellas que el discurso hegemónico sobre mujeres propone como adecuadas.

  8. Fundamentos del metodo cientifico

    Directory of Open Access Journals (Sweden)

    Badii, M. H.

    2004-01-01

    Full Text Available El objetivo de esta obra no radica en realizar una búsqueda exhaustiva de la literatura en el tema, sino, sentar las bases del método científico, notando los aspectos filosóficos e éticos de la ciencia. Se presentan los conceptos y definiciones fundamentales relacionados con la metodología de la investigación científica. Se maneja el concepto de la toma de los datos válidos como un requisito básico en cualquier trabajo científico. Se pone a disposición del lector un modelo denominado el ECOEE que es una herramienta poderosa para establecer puntos de comparación e discusión entre los resultados de diferentes trabajos científicos. Finalmente, ofrece unas sugerencias de que hacer o no hacer en cuanto a realizar un trabajo de investigación.

  9. RECUERDOS DEL SIGLO XX

    Directory of Open Access Journals (Sweden)

    ASUNCIÓN LAVRIN

    2011-10-01

    Full Text Available Este ensayo hace una revisión de conceptos clave en la educación de la mujer en Hispanoamérica, en la primera mitad del siglo XX, y el debate sobre la educación superior de la mujer. También analiza las ideas de Gabriela Mistral para la educación femenina en su Lectura para mujeres, y las compara con las de la escritora mexicana Rosario Castellanos. Finalmente, hace un llamado por nuevos modelos educativos para la mujer de siglo XXI.Este ensayo hace una revisión de conceptos clave en la educación de la mujeren Hispanoamérica, en la primera mitad del siglo XX, y el debate sobre laeducación superior de la mujer. También analiza las ideas de Gabriela Mistralpara la educación femenina en su Lectura para mujeres, y las comparacon las de la escritora mexicana Rosario Castellanos. Finalmente, hace unllamado por nuevos modelos educativos para la mujer de siglo XXI.

  10. Incorrecciones del habla infantil

    Directory of Open Access Journals (Sweden)

    María del Pino LECUONA NARANJO

    2009-11-01

    Full Text Available En el presente trabajo se pretende dar una visión de algunos rasgos característicos del lenguaje infantil, centrándonos especialmente en el estudio de los niños de 4 a 6 años de edad. Es pues, su finalidad fundamental la descripción y análisis de los rasgos que se pueden observar en la expresión verbal de los preescolares. Las diversas peculiaridades que van a ser objeto de examen se refieren a la emisión de incorrecciones de carácter fonético, morfológico y semántico. El análisis unificado de estos tres factores responde a la consideración de que todos surgen como consecuencia de un proceso de simplificación lingüística originado por un estado inconcluso de desarrollo del lenguaje.

  11. Carta del Editor

    Directory of Open Access Journals (Sweden)

    Jorge Jarrín Mantilla

    2015-01-01

    Full Text Available Comunicación y Género, acopia trabajos que vinculan a la mujer y la comunicación y sus esfuerzos por no ser consideradas inferiores. Del libro a la pantalla, acerca a algunas reflexiones sobre el proceso que lleva del libro a la pantalla por la polémica que despierta la adaptación de las novelas, puesto que muchos señalan que la trama se ve desfigurada. Se agregan varios temas sobre el cine. En "Días de Radio", se plantea el que a pesar de la censura y los problemas económicos que deben enfrentar, las radios populares de América Latina, siguen ganando espacios, de su desarrollo depende una mayor profundización de la democracia. Tema de debate es Estrategias comunicativas en Chiapas y Haití. Se añaden dos entrevistas a un caricaturista brasileño y a un corresponsal de guerra muy prestigiado.

  12. Gerencia del Siglo XXI

    Directory of Open Access Journals (Sweden)

    John Orlando Crissien Castillo

    2013-07-01

    Full Text Available El cambio es más rápido que nunca, la tecnología genera nuevos modelos gerenciales, los mercados se abren, el paradigma de la competitividad y la productividad. Los gerentes modernos estamos expuestos a muchas presiones generadoras de estrés; hecho que, según la OMS (Organización Mundial de la  alud, está entre las tres enfermedades que cobran más muertes en el mundo. EL campo de juego gerencial ha cambiado: por ende la gerencia del siglo XXI requiere un perfil de administrador-gerente diferente. Este nuevo gerente se debe tornar líder y administrador. Las cosas se administran, la gente se lidera, se gerencia. Por esto el gerente líder del siglo XXI se debe formar, capacitar, entrenar en aquellas habilidades-competencias requeridas por este nuevo entorno. Por tal razón debe generar dos sets de competencias: las de gerente integral y el desarrollo de la capacidad directiva.

  13. Carta del Editor

    Directory of Open Access Journals (Sweden)

    Luis Eladio Proaño

    2015-01-01

    Full Text Available Refiere el Informe Nacional de Brasil sobre el Diagnóstico de la Comunicación en América Latina en el que se analizan los más importantes medios de comunicación de ese país. En el artículo de opinión se reflexiona sobre los cambios que sufre la comunicación política en la región como resultado de nuevos protagonistas con nuevos mensajes como: Hugo Chávez, Venezuela, Bucarám, Ecuador y Fujimori, Perú. Describe dos noticias que han llamado la atención: la desinformación en la campaña electoral de los Estados Unidos y el peculiar sistema de comunicación del Presidente Chávez para mantener la popularidad. En cultura para la imagen periodística impresa o Infografía muestra los esfuerzos que la prensa diría del mundo entero hace para competir en cuanto a imagen con la televisión. Se trata la elaboración de los guiones cinematográficos y en Comunicación Institucional se responde a cómo a solucionar los problemas de un banco desde Argentina.

  14. El Gobierno del mal menor

    DEFF Research Database (Denmark)

    Agustin, Oscar Garcia

    2012-01-01

    El Gobierno no aspira a ser bueno ni malo. Se conforma con ser el Gobierno del mal menor, cuyas medidas drásticas y poco populares están destinadas a salvar a los ciudadanos del desastre que no ha llegado todavía pero podría llegar....

  15. Tratamiento del paciente con artrosis

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    Francisco Vargas Negrín

    2014-01-01

    Full Text Available El manejo terapéutico del paciente con artrosis tiene como objetivo disminuir la sintomatología dolorosa e inflamatoria, mejorar la capacidad funcional del paciente y la aplicación de intervenciones terapéuticas eficaces y lo más seguras posibles. Un enfoque centrado en el paciente implica su participación activa en el diseño del plan terapéutico y en la toma de decisiones informadas oportunas en todas las etapas de la enfermedad. La educación terapéutica, la actividad física y el ejercicio terapéutico junto con el control de peso, en caso de sobrepeso u obesidad, constituyen el núcleo central del tratamiento. Los autocuidados individuales y por los familiares son fundamentales en el control del día a día del paciente. El uso de terapias físicas, ayudas técnicas (bastón, etc. y de fármacos tipo analgésicos simples, opioides y antiinflamatorios tiene evidencias demostradas en el control del dolor, mejora la funcionalidad y la calidad de vida del paciente y una clara recomendación de uso en el tratamiento de la artrosis. La cirugía conservadora y la de reemplazo articular se indican en los casos en los que no se logran los objetivos terapéuticos en casos concretos.

  16. El Derecho universal del Trabajo

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    Héctor-Hugo Barbagelata

    2014-01-01

    Full Text Available La idea de un derecho universal del trabajo no es nueva, en realidad es más antigua quela legislación del trabajo y por lo tanto, más antigua que la propia rama del derecho que estudia estas cuestiones.Sí, son nuevos los avances que con ese objetivo se han ido registrando desde fines del siglo pasado.I- Introducción.- II Antecedentes.- II Constitucionalización e internacionalización.- IV Principios y criterios de interpretación del bloque de constitucionalidad.- A Criterio fundado en las condiciones del Estado Social de Derecho; B Principio de complementariedad e interdependencia de todas las normas sobre derechos humanos; C Primacía de la disposición más favorable a la persona humana; D Criterio resultante del principio de progresividad.; E Principio de irreversibilidad o de no regresión. F Principio de autoejecución y autoaplicación..- V Conflictos entre los derechos fundamentales .- VI.- Los principios filosóficos: a La Justicia social ; b La especificidad del trabajo humano; c Reafirmación de la dignidad de la persona humana; VII Conclusiones. 

  17. Taquicardias supraventriculares. Estado del arte

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    Jairo Alfonso Gándara Ricardo

    2016-01-01

    El tratamiento de las taquicardias supraventriculares dependerá del estado hemodinámico del paciente, el cual definirá el requerimiento de terapia eléctrica o tratamiento médico. Se debe hacer una selección adecuada de los pacientes que requieren estudio electrofisiológico y ablación.

  18. Crecimiento y mortalidad de la madreperla Pinctada mazatlanica en poblaciones naturales del litoral oriental de Baja California Sur, México

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    Humberto Wright-López

    2009-06-01

    Full Text Available La madreperla Pinctada mazatlanica esta en veda desde 1939 y considerada en peligro de extinción, cambiando su categoría a protección especial en 1994. El presente estudio estima su crecimiento y mortalidad en bancos naturales en el periodo 1992-93 y 1997-99. Se registró el alto de la concha de ostras en poblaciones desde el paralelo 28º a 23º LN del litoral oriental de Baja California Sur, abarcando 38 estaciones, 2 bahías y 6 islas. La longitud máxima estimada fue 187.22mm (179.83-195.81mm, P > 0.95. Las frecuencias de longitud se ordenaron en un "año virtual". Los parámetros de crecimiento de von Bertalanffy estimados con el programa ELEFAN I fueron: o = 193.31mm, k=0.54año-1, t0= -0.1805 años, C=0.49 y WP=0.75; el índice de desempeño del crecimiento fue’=4.305. La mortalidad total fue de Z=2.03 año-1 por longitud convertida a curva de captura. La regresión peso total y la altura tuvo la expresión W(i=0.0005418 * L(i2.7301. Los parámetros de crecimiento fueron similares a los de Pinctada margaritifera de bancos de mar abierto y diferentes a aquellos de ostras perleras en repoblamiento en bahía de La Paz. La mortalidad mostró valores parecidos a los estimados para Pinctada radiata del Mar Rojo.Growth and mortality of the mother-of-pearl Pinctada mazatlanica in natural populations of the east coast of Baja California Sur, Mexico. The Mexican Pacific mother-of-pearl Pinctada mazatlanica was placed in forbidden fisheries status for the Mexican Federal Government and considered in extinction danger since 1939. This decree was modified in 1994 to allow the capture of spat for research or marine culture. We estimated the growth and mortality of mother-of-pearl from the eastern littoral of South Baja California wild stock in the periods 1992-93 and 1997-99. We used 38 sample stations at 2 bays and 6 insular complexes. The maximum length was 187.22 mm (179.83-195.81 mm, P > 0.95. Seasonal von Bertalanffy growth (ELEFAN I routine

  19. Notas del Consejo Editorial

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    Fernando Serpa Florez

    1990-08-01

    Full Text Available

    Merecida Distinción
    Complacidos registrados la señalada distinción de que fue objeto en Hiroshima, Japón, durante la celebración del IX Congreso Mundial de la Organización Internacional a Médicos para la Prevención de la Guerra Nuclear (lPPNW el Académico Honorario Alberto Cárdenas Escovar quien recibió el Premio Albert Schweitzer, en reconocimiento a la meritoria labor que ha cumplido en el campo internacional de la medicina.

    Fernando Serpa Flórez

    Breves de la Academia
    En el número anterior de nuestra revista, por involuntaria omisión no se incluyeron dos señalados acontecimientos, que nos apresuramos a subsanar en la presente edición. Se trata del ingreso a la Corporación de dos distinguidos y muy apreciados Miembros de nuestro Instituto, el Académico correspondiente Joaquín Silva, Profesor de Cirugía y eminente maestro de numerosas generaciones médicas, quien disertó en forma erudita y ponderada sobre el tema “Los albores de la Medicina y Cirugía”. Así mismo tomó posesión como Miembro de Número el actual Presidente del Capítulo de los Santanderes de la Academia Nacional de Medicina, ex-decano de la Escuela de Medicina de la Universidad Industrial de Santander y notable escritor y psiquiátra doctor Roberto Serpa Flórez, quien presentó su libro sobre medicina y enfermedades tropicales en Colombia en la primera mitad de este siglo que, en forma interesante y amena, desarrolló alrededor de la biografía de su padre, el también Académico de Número profesor Roberto Serpa Novoa.

  20. Caracterización del potencial de abuso del flunitracepam

    OpenAIRE

    Martí de la Llave, Cecilia

    1997-01-01

    Con el presente estudio se pretende caracterizar el potencial de abuso del flunitracepam. La pauta de administración del flunitracepam está ajustada para alcanzar concentraciones máximas plasmáticas similares entre los dos regímenes de administración del fármaco activo, aunque a diferente velocidad; con la dosis única se alcanza la concentración máxima plasmática más rápidamente que con la dosis dividida. Cuando el voluntario recibe el fármaco activo a dosis única toma cinco cápsulas que ...

  1. Del Charco del Agua Amarga (Alcañiz

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    Tomás MAIGI

    2009-10-01

    Full Text Available En agosto de 1947, habiendo llegado a la excelentísima Diputación Provincial de Teruel rumores de recientes deterioros en el friso pintado del abrigo rupestre del "Charco del Agua Amarga", nos fué requerida oficialmente, por dicha Corporación, la presentación de un informe sobre la realidad de los hechos expuestos, así como el planeamiento de las medidas adecuadas para salvaguardar en forma eficaz, en el futuro, las referidas pinturas.

  2. Calidad del servicio de taxis del municipio Maracaibo

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    Joheni A. Urdaneta G.

    2011-05-01

    Full Text Available El presente trabajo tiene como objetivo describir la calidad del servicio de los taxis en el municipio Maracaibo, ya que los mismos forman parte del sistema de transporte urbano de la ciudad, y es un servicio público fundamental para la convivencia de la sociedad; para lograr este objetivo se realizó una adaptación del modelo SERVPERF, diseñando un instrumento tipo cuestionario, con 32 ítems en 6 dimensiones, adecuado a las características propias del servicio de taxi, con la finalidad de confirmar que los ítems de los instrumentos se correspondían con las dimensiones adaptadas se aplicó la técnica de análisis factorial resultando un nuevo instrumento con 24 ítems en 3 dimensiones. Se utilizó la escala de Likert con tres (3 alternativas de respuesta. La investigación es de tipo descriptiva y aplicada, bajo diseño no experimental de tipo transeccional descriptiva y de campo. La población quedó conformada por los usuarios de las líneas de taxis del municipio Maracaibo. Se aplicó muestreo aleatorio por conglomerado. La confiabilidad del instrumento se midió a través del coeficiente alfa de Cronbach resultando de 0,82 lo cual se considera aceptable. Los resultados revelan que la calidad del servicio de taxis del municipio Maracaibo es mediana por lo tanto este servicio es susceptible a mejoras, las cuales son necesarias para elevar la calidad de vida de los marabinos. Este resultado se obtuvo con el instrumento originalmente adaptado de 32 ítems y con el cuestionario resultante del análisis factorial, de 24 ítems; esto confirma lo apropiado de esta técnica, ya que se redujo el número de ítems y de las dimensiones originalmente adaptadas y no se encontraron diferencias significativas en los resultados con ambos instrumentos; de esta manera se puede medir la calidad del servicio de taxis en el municipio Maracaibo a través de las dimensiones: confiabilidad del servicio, socialización y responsabilidad.

  3. DE LA SOCIEDAD DEL CONOCIMIENTO A LA SOCIEDAD DEL RIESGO

    OpenAIRE

    Abdala Cardona, Alejandro

    2013-01-01

    El tiempo en el que vivimos: el siglo XXI, presenta a la vez, retos y exigencias al conjunto global de los habitantes del mundo, puesto que, no solo se nos presenta la actualidad como aquella coyuntura histórica en los que el cambio de los acontecimientos gira en torno al rol central del conocimiento, sino también, en torno al potencial que dicho conocimiento trae tras de sí; es decir, el presente siglo impone al conjunto de personas el rótulo de "sociedad del conocimiento" donde se puede enc...

  4. Historia del desarrollo institucional turístico del Meta

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    Ramón Vergel

    2002-11-01

    el primer plan de desarrollo turístico departamental, se comienza a visualizar diferentes tipologías de turismo que se podían desarrollar como el Ecoturismo y a trabajar en pro de ello. Surge luego el segundo Plan Sectorial del Meta visualizando al turismo como producto. Posteriormente se realiza un Estudio Exploratorio sobre el Potencial Turístico del Meta y la promoción turística del departamento comienza a surgir con la participación en ferias y vitrinas turísticas importantes logrando así fijar un mercado turístico: Bogotá.

  5. Perfil del director hospitalario

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    Gabril Pontón Laverde

    1990-04-01

    Full Text Available RESUMEN El hospital, sin importar su tamaño, es una empresa de servicios con una importante función social que trabaja dentro de las características administrativas y económicas generales, toda vez que actúa dentro de un  SISTEMA ABIERTO con los componentes clásicos de una demanda cíclica de servicios de salud, que requiere de una organización con personas, materiales y equipos que trabajan para dar respuesta a esa carencia y que produce resultados que benefician a la comunidad. Tienen un efecto de retroalimentación (Feed – back con base con las experiencias, expectativas y nuevas demandas de servicios y que trabajan dentro de una comunidad precisa, como parte integrante de un sistema mayor, al cual beneficia y fortalece con sus resultados y del que depende para su supervivencia.

  6. Los presupuestos del Concurso

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    Línea de Investigación “De la Crisis Empresarial

    2006-01-01

    Full Text Available Este escrito es el resultado de uno de los proyectos de investigación adelantados por el Departamento de Derecho Comercial de la Universidad Externado de Colombia. En el se hace una aproximación histórica a los presupuestos para acceder a los trámites concursales en Perú, Argentina y España, analizándolos desde los puntos doctrinal, académico y legal.Así mismo, es parte integrante de un trabajo más amplio que pretende elaborar un documento contentivo del tratamiento que se da a los presupuestos concursales a nivel mundial.En este orden de ideas, nos permitimos presentar un análisis minucioso de la legislación de los citados países iberoamericanos.

  7. cuarto del siglo XX

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    José Antonio Nieto Calmaestra

    2005-01-01

    Full Text Available Los últimos 25 años del siglo XX han supuesto un sustancial cambio en el modelo de crecimiento de la población andaluza. Así, mientras la caída de la fecundidad y la estabilización de las tasas de mortalidad han contribuido a un progresivo retroceso de la vitalidad natural, la masiva emigración de antaño ha dado paso al papel de Andalucía como incipiente foco de inmigración y al creciente protagonismo de movimientos internos de relocalización de la población. Desde el punto de vista territorial estas afirmaciones quedan matizadas por los notables contrastes que se producen entre los distintos ámbitos que conforman la región y que contraponen al medio rural con el urbano, al litoral con el interior o a las grandes ciudades con sus periferias.

  8. del caribe colombiano

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    José Amar A.

    2006-01-01

    Full Text Available La investigación indagó acerca de la construcción de conceptos económicos en una muestra de 50 estudiantes universitarios, residentes en una ciudad multifinanciera de la región Caribe colombiana. Para conocer las conceptualizaciones se aplicó una entrevista en profundidad que permitió indagar sobre la función, valor y circulación del dinero y la emisión y acuñación monetaria. Se encontró que sólo el 24% de los jóvenes universitarios alcanza el nivel de pensamiento económico inferencial, y no hay diferencias significativas de acuerdo con el programa académico al que pertenecen. Los resultados indican que los jóvenes presentan un desfase en cuanto a nivel de pensamiento económico, de acuerdo con el contexto internacional.

  9. Avatares del paradigma conexionista

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    Asier Arias

    2012-02-01

    Full Text Available Hace ahora un año que falleciera David Everett Rumelhart, conexionista pionero y editor junto con James Lloyd McClelland de la llamada “biblia del Procesamiento Distribuido en Paralelo” (PDP. Al mismo tiempo, los dos volúmenes de la referida biblia celebraban su vigésimo quinto cumpleaños. También uno de los padres de la inteligencia artificial, John McCarthy, que bautizara de hecho la disciplina, nos abandonó el pasado mes de octubre a los 84 años. Estas tres efemérides nos sirven de pretexto para un breve recorrido por las derivas y obstáculos a los que se ha enfrentado el llamado paradigma conexionista desde su puesta en escena como alternativa al cognitivismo clásico.

  10. El reordenamiento del mundo

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    Antonio Pasquali

    2015-01-01

    Full Text Available Se publica la propuesta de marco histórico y proyección de futuro de Antonio Pasquiali, en nuestra opinión, es útil referente contextualizado para los ensayos y estudios de caso sobre la formación del comunicador profesional. La evolución reciente de la filosofía, la ciencia y la tecnología llevan a Pasquali a afirmar que la humanidad se encamina lentamente hacia la reformulación global de la moral de la intersubjetividad, y a replantear desde sus cimientos el contrato social que concierne a la comunicación social mediática.

  11. Beneficios del descanso peritoneal

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    Jesús Lucas Martín Espejo

    Full Text Available Introducción: Valorar si el descanso peritoneal, de al menos un día semanal, ha supuesto mejoras en la rehabilitación de los pacientes y el impacto clínico que puede suponer. Nos planteamos además cuantificar el beneficio económico. Material y Método: Se realizó un estudio longitudinal, retrospectivo, descriptivo. De los pacientes atendidos en nuestra unidad desde el 1 de enero de 2014 al 31 de diciembre de 2014, se estudiaron los pacientes que cumplieran todo el año de seguimiento y que no procedieran de otras técnicas de depuración como la hemodiálisis o trasplante renal. La muestra de estudio estuvo compuesta por 40 pacientes, de los que 21 tuvieron prescrito al menos 1 día semanal de descanso peritoneal y 19 pacientes sin descanso. Se recogieron las siguientes variables al inicio del periodo de estudio y a los 12 meses: Variables demográficas, variables relacionadas con el estado de volumen, datos clínicos relacionados con la técnica, se pasó una encuesta de satisfacción a todos los pacientes estudiados, y se recogieron los importes del coste mensual de cada tipo de tratamiento. Resultados: Las diferencias iniciales entre los grupos, eran esperables ya que son los valores en los cuales se ha basado la prescripción del día de descanso. La exposición a la glucosa, al comienzo y al final fue menor en el grupo con descanso. Al año, no se encontró diferencias en los parámetros estudiados. Una encuesta de satisfacción nos reveló a que dedican los pacientes el día de descanso y los que no lo tienen a que lo dedicarían. Conclusiones: El descanso peritoneal no ha supuesto una peor evolución de los parámetros clínicos estudiados al año de seguimiento, cumpliendo las recomendaciones de adecuación de diálisis de las guías clínicas. La exposición a la glucosa, aun sin llegar a ser significativa por la duración del estudio, ha sido menor en el grupo con descanso. El día de descanso ha facilitado a los pacientes

  12. Carta del editor

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    Oscar Mauricio Covarrubias-Moreno

    2014-05-01

    Full Text Available Henos aquí con un nuevo número de RIESED. Después de casi un año de ver la luz, y como lo anticipábamos en la carta del editor que acompañaba al número fundacional, hacer una revista electrónica no ha sido una tarea sencilla. Un año más tarde no podemos sino confirmar esa opinión.Gracias al decidido trabajo de los autores, revisores y miembros del equipo editorial hemos podido hacerlo. El proceso de revisión de los artículos ha merecido un cuidado, dedicación y tiempo especiales, que hicieron necesario demorar unos días la fecha de publicación de este tercer número. Asumimos un compromiso con la calidad y estamos convencidos que esa es la única posibilidad de éxito para una revista científica. El contenido y nivel de los artículos disponibles servirá sin duda como incentivo para que los investigadores deseen publicar sus aportes en RIESED.Agradezco especialmente a la Dra. Gloria Rosique Cedillo, Editora Invitada y Coordinadora de este tercer número, así como al investigador César Nicandro Cruz-Rubio, Editor Asociado, apreciados colegas con quienes he tenido el privilegio de trabajar a lo largo de estos meses, y cuya dedicación y esmero han hecho posible RIESED 3.Por otra parte, derivado de nuestro proyecto editorial informo a ustedes de la creación de la Cátedra RIESED. Educación y Sociedad. Esta Cátedra es una iniciativa que la Universidad del Desarrollo Empresarial y Pedagógico ha impulsado en estrecha colaboración con el Grupo de Investigación en Gobierno Administración y Políticas Públicas (GIGAPP del Instituto Universitario de Investigación Ortega y Gasset (IUIOG, Fundación Ortega – Marañón; así como, con la Academia Internacional de Ciencias Político Administrativas y Estudios de Futuro A.C.La Cátedra está concebida como un espacio de diálogo y reflexión interdisciplinario sobre las diferentes temáticas abordadas en RIESED. En el marco de esta iniciativa académica, se invita a los miembros

  13. Memoria del mal

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    Semprún, Jorge

    2011-06-01

    Full Text Available In May 2003 the twelfth edition of the «Aranguren Conferences» was held. Jorge Semprún gave three keynote speeches titled «Kant and the Maquis’ rucksack», «The radical evil and the Buchenwald latrines» and «Literature and memory of the evil: from Sartre to Paul Ricoeur», all of them grouped under the generic denomination Memory of Evil. The thread running through the three speeches was Semprún’s experience as a political deportee at Buchenwald concentration camp, so close to the Weimar camp of Schiller and Goethe. There, he could experience the radical evil, but also the brotherhood through the antifascist resistance groups who coordinated the various clandestine political groups at the camp. This experience helped him review some of the philosophical readings he had done as a philosphy student at the Sorbonne, as well as those readings he took an interest in following the end of the war. In this way, Semprún went over various authors (Immanuel Kant, André Malraux, Edmund Husserl, Jacques Maritain, Martin Heidegger, Karl Marx, Hannah Arendt, Jean Paul Sartre, Paul Ricoeur or Primo Levi arguing their relationship with the issue of Evil.

    En mayo de 2003 se celebró la duodécima edición de las «Conferencias Aranguren». Jorge Semprún dictó tres conferencias magistrales tituladas «Kant y la mochila del maquis», «El mal radical y las letrinas de Buchenwald» y «Literatura y memoria del mal: de Sartre a Paul Ricoeur», agrupadas todas ellas bajo el título genérico de Memoria del mal. El hilo conductor de las tres intervenciones fue la experiencia de Semprún como deportado político en el campo de concentración de Buchenwald, tan cercano al Weimar de Schiller y Goethe. Allí pudo experimentar el mal radical, pero también la fraternidad, a través de los grupos de resistencia antifascista que coordinaban en el campo los distintos grupos políticos clandestinos. Esta experiencia le sirvió para repasar las lecturas

  14. [Feminismos del siglo XXI

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    M. Xosé Agra

    2013-07-01

    Full Text Available ¿Qué soluciones políticas podemos encontrar para las nuevas formas de subjetividad? ¿Cómo debe la teoría feminista interpretar la voluntad de romper los límites y, al mismo tiempo, la necesidad de normalidad? Los pensadores posmodernos son escépticos respecto de las nociones tradicionales de identidad; los límites que definen al sujeto no sólo construyen sino que también excluyen. Debemos oponernos a las interpretaciones dominantes de normalidad y aceptar otras posibles alternativas a los modelos tradicionales. Necesitamos ir más allá del binario sistema sexo/género y de la orientación sexual y mantener una mentalidad abierta, persiguiendo una filosofía de la libertad.

  15. La materialidad del sonido

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    Esteban Manuel Stepanian Taracido

    2012-04-01

    Full Text Available La investigación sobre los procesos de producción sonora en la crea-ción de obras audiovisuales afectan, en términos generales, a cuestio-nes exclusivamente tecnológicas. Para valorar su rendimiento expresi-vo en la construcción del discurso es imprescindible que, de forma paralela, esta investigación se aborde también desde la perspectiva de la realización audiovisual.Para ello es necesario asumir que los conceptos básicos en los que se fundamenta el desarrollo tecnológico no han de ser necesariamente esenciales en los estudios que se plantean desde puntos de vista creati-vos.En particular es oportuno someter a examen el concepto de fidelidad y reivindicar las posibilidades emotivas, e incluso significantes, de formatos de producción sonora hoy en desuso.

  16. La democracia del futuro

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    Rodrigo Borja

    2015-01-01

    Full Text Available El desarrollo logrado por la informática, la microelectrónica y en general las nuevas tecnologías de la información, hace que del zoon politikon aristotélico se pase al homo digitalis posmoderno, de una "democracia restringida" a una telecracia: en el siglo XXI. El autor vaticina que el voto se hará vía computadores desde casa a través de éstos, los gobernantes podrán tener una relación directa con los gobernados, las consultas populares serán más frecuentes, las implicaciones para los regímenes democráticos serán enormes y es en torno a ellas que reflexiona el autor

  17. Valor social del anciano

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    Luna Torres Bertha

    1997-11-01

    Full Text Available

    The old age is been surrounded bymisteries, myths and prejuidices. The concepts and the valoration of the ancient man, have been contradictory. In different places and in many cultural moments, the old man has been taken from the glory to the scorn. The actual world scrolls the ancient in a very fast rhythm; the social changes have generayed conditions of disadvantajes for that group of the population, difficulting even more the process of growing old, that in fact has a lot of limitations. Its important that a lot of professionals from many institutions involved with this important cause, join the work developed by geriatrics and gerontologics;  soin this way we can restore the social values of the ancient, who deserves a peacefull old age in compensation with his participation in the job of building a better society. Only in this way, the fear to grow old will be lost.

    La vejez se ha visto rodeada de tabúes, mitos y prejuicios. Han sido contradictorios los conceptos y la valoración del anciano, quien en lugares y momentos culturales ha estado desde ensalzado hasta despreciado. El mundo actual, desplaza al geronte a ritmo acelerado; los cambios sociales han generado condiciones de marginalidad para ese sector de población, dificultando aun más el proceso de envejecer, que de hecho tiene limitaciones. Es por eso importante que al trabajo que desarrollan geriatras y gerontólogos se sumen otros profesionales y un sinnúmero de entidades; en aras de eliminar prejuicios y rescatar el valor social del anciano, quien por su legado merece un ocaso, que compense su aporte y participación en la construcción de la sociedad, solo así se perderá el miedo a envejecer.

     

  18. Para aprender del pasado

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    Esquivel Valverde, Lidier

    2004-05-01

    Full Text Available Este texto reflexiona sobre la importancia de reconocer el valor que tiene el conocimiento de los eventos del pasado, como fuentes importantes de lecciones aprendidas. Inicia presentando ejemplos de sucesos históricos en Japón y cómo estos han sido utilizados de forma positiva en los procesos de educación en niños y adultos. Posteriormente presenta la realidad de Costa Rica, donde a nivel de la población existe un desconocimiento de hechos históricos sobre el tema, al propiciarse su olvido u ocultamiento. Finalmente, los autores exponen sobre un programa del Área de Prevención de la Comisión Nacional de Prevención de Riesgos y Atención de Emergencias, quienes se han dedicado de distribuir reseñas históricas breves de los principales eventos en el país This text reflects about the importance of recognizing the value of knowing past events as important sources for lessons learned. It starts including examples of historical events in Japan and how they have been used positively in the educational processes for children and adults. Lately, it includes the reality in Costa Rica. The population does not know about historical events on the topic because they have been forgotten or not shared. Finally, the authors refer to a program of the Prevention Area of the National Commission of Risk Prevention and Emergency Response that has dedicated to distribute brief historical reviews about the main events in the country

  19. Discurso del Presidente Entrante

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    Gilberto Rueda Pérez

    1994-09-01

    Full Text Available

    Santafé de Bogotá, D.C., 17 de mayo de 1994

    Señoras y señores:

    Estoy profundamente conmovido y emocionado, al escuchar los elogiosos comentarios de quienes me precedieron en el uso de la palabra, pues, aunque inmerecidos, naturalmente me enorgullecen sobremanera.

    Quiero, antes de iniciar mi discurso, agradecer a la noble Academia de la Lengua, a su presidente doctor Jaime Posada y a los miembros de su Junta Directiva, la generosa hospitalidad en este precioso auditorio que contribuye a dar realce a esta sesión solemne.

    Muchas Gracias.

    Deseo manifestar, que los conceptos que vaya emitir, reflejan mi pensamiento y por tanto, de ellos soy responsable. No pretendo con ellos criticar, ni mucho menos ofender, a personas o instituciones, son más que todo reflexiones, que me llevan a propuestas de trabajo para el futuro y espero que así sean percibidas y analizadas por esta distinguida audiencia.

    El día 3 de enero de 1873, el joven médico Abraham Aparicio, reunió en su residencia, en las primeras horas de la fría noche santafereña, a sus colegas Manuel Plata Azuero, Nicolás Osario, Liborio Zerda, Leoncio Barreta y Evaristo García, con el propósito de crear una sociedad científica, para el estudio y adelanto de las ciencias médicas y naturales, así como para solidarizar al cuerpo médico y darle unidad al ejercicio profesional en el país. Así nació la Sociedad de Medicina y Ciencias Naturales que posteriormente sería elevada a la categoría de Academia Nacional de Medicina, por la Ley 71 de 22 de noviembre de 1890.

    Sin embargo, bien vale la pena rememorar los orígenes aún más remotos, de esta insigne institución.

    El 29 de diciembre de 1816, el Dr. Pablo Fernández de la Reguera, médico cirujano, químico y boticario mayor del ejército expedicionario, inspector de los hospitales, en comunicación dirigida al Sr. Brigadier Don Juan Sámano, Gobernador militar y político de la

  20. Carta del Editor

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    Blasco Fernando Checa Montúfar

    2015-01-01

    Full Text Available En "El laberinto de la ciberred" se habla de los beneficios y problemas que caracteriza el caos existente en la telaraña cibernética. Ahora el cibernauta puede acceder a una inimaginable oferta de información multimedia. Este caos garantiza libertades, pero presenta enormes limitaciones para quienes no tienen acceso a la tecnología, particularmente en países de América Latina, carentes de Políticas de Comunicación que generen condiciones para un uso intensivo, extensivo y democrático de la ciberred. En el tema “La televisión por cable" relacionado con la cultura visual, multimediática, satelital, informática, televisionada, se señala que tiene como soporte a la más antigua nueva tecnología, la televisión por cable. Se trata de uno de los más grandes negocios disputados por los magnates nacionales y transnacionales de la comunicación que atraparon para el año 2000 a más de 20 millones de suscriptores de la televisión pagada. En esta entrega se presentan distintos acercamientos del perfil del ombudsman de prensa, las ventajas y límites de esta institución, su necesaria independencia, trasfondo ético, autonomía y otros aspectos que contribuirán a fortalecer mecanismos adecuados para controlar este "peligroso poder”

  1. Carta del editor

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    Simón Espinosa

    2015-01-01

    Full Text Available La autora relata la historia de las Relaciones Públicas y dice que surgieron y se desarrollaron para legitimar ante el público los intereses económicos y políticos de quienes detentan el poder. Se cuestiona sobre el por qué no aplicar las relaciones públicas, en organizaciones populares, para que mejoren su publicación y orienten sus propósitos de desarrollo. El tema que aborda las Políticas culturales en América Latina acopia un extracto de lo más trascendente de los ensayos del libro editado por Néstor García Canclini. Sobre la telenovela se afirma que esta ha llegado a ser uno de los instrumentos más importantes de la comunicación popular: por ella desfilan las identidades de las más variadas culturas brasileñas. Y en cuanto a la caricatura se relata lo que ocurrió en el Seminario taller " Caricatura y Periodismo", realizado el(9-11 de Nov.- 1987 en el CIESPAL. El estudio sobre el mercado del vídeo se ve dificultado por la imprecisión de los datos obtenidos. Los datos oficiales no siempre se aproximan a la realidad, pues el mercado de vídeo se instauró en América Latina partiendo de una lógica totalmente diversa de los equipos de sonido e imagen.

  2. Los objetivos del desarrollo

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    Currie Lauchlin

    1993-12-01

    Full Text Available To broach the goals of development implies broaching the problem of economic growth in a critical manner. Not only the concept of growth but also the means of achieving it in practice should be questioned. Growth is not an end, it is a means of gaining access to development And development should not be understood as a goal, but as a permanent process of learning tending towards more control over the environment and greater levels of well-being. It is not a matter of increasing GNP linearly; development must occur, sustained growth that, without being a threat to mm or to our natural resources, can lead to the eradication of absolute and relati.ve poverty. The low rates of growth of the developing countries constitute structural problem that can /lot be reso1.ved by resorting to the neo-classical mechanisms of mobility, nor to the Keynesian formulas. These have served as a source of inspiration to the Harrod-lX:m3r·type models of growth which limit themselves to stimulating savings and ending unemployment by concentrating exclusively on the monetary demand. Getting OUt of the vicious circle of low growth implies eradicating poverty with respect into the immediateness of a direct attack on the problem. with respect to the developed counties, growth is starting to became harmful, and, given the prevalence of ostensible consumption and of pecuniary emulation, it is imperative to foment non-economic motivation that will permit the eradication of relative poverty.

    Abordar los objetivos del desarrollo implica abordar de manera crítica el problema del crecimiento econ

  3. Deslumbramientos del mercado

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    Monique Selim

    2006-07-01

    Full Text Available Con eje en los diferentes aspectos que adopta el actual proceso de mundialización de la lógica del mercado y expansión capitalista, aún en países socialistas, el presente artículo plantea la necesidad de una reflexión antropológica susceptible de articular el surgimiento de nuevas formas de dominación y representación simbólicas. Se discute el aparente efecto de unificación intelectual producido por la hegemonía del mercado respecto de hechos sociales heterogéneos dados en la historia reciente de las sociedades contemporáneas. Así, la renovada atracción que ejercen los nuevos escenarios sociales reconfigurados en virtud de las modalidades específicas de encarnación y operación de los procesos globalizantes, llama al estudio antropológico de las coyunturas. La autora despliega una interpretación del socialismo de mercado, conjunción -siempre en tensión- de un monopolio político estatal y una liberalización del mercado económico. En esta perspectiva se reubica el interés de una antropología del presente en relevar localmente, en este caso en Vietnam del Norte, la conformación de un nuevo mercado de demandas simbólicas, donde la reaparición de las prácticas culturales de comunicación con los antepasados expresa la necesidad de reunificación familiar y reconciliación con los muertos en la "larga guerra".Tendo como eixo os aspectos diferentes que adota o processo atual de mundialização da lógica do mercado e de expansão capitalista, até mesmo nos países socialistas, este artigo propoe a necessidade de uma reflexão antropológica capaz de articular o aparecimento de novas formas de dominação e de representação simbólica. Discute-se o efeito de superfície de unificação intelectual causado pela hegemonia do mercado em fatos sociais diversos em sociedades contemporâneas. Assim, a atração renovada de novos fatos sociais pelos modos específicos de incorporação e operação de processos de globaliza

  4. La legitimidad del derecho penal

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    Francisco Bernate-Ochoa

    2010-03-01

    Full Text Available El interrogante sobre la legitimidad del derecho penal se ha convertido en un asunto medular dentro de los estudios contemporáneos sobre la materia, dado que hoy en día se reconoce que a partir de la solución a este interrogante teórico se puede asumir la tarea de construir un sistema. El panorama contemporáneo nos ofrece dos soluciones al respecto: por una parte, se sostiene que la legitimación del derecho penal emana de la Constitución, y se prescinde de una construcción sistémica del delito en aras de la obtención de consecuencias acordes con lo planteado en la Carta Política. Por otra, desde una propuesta -de corte normativista- se entiende que la legitimación del derecho penal debe encontrarse en la sociedad, y a partir del entendimiento de ésta se encuentra la necesidad de aquél, lo cual ejerce una influencia en la construcción del sistema del delito.

  5. Del internacionalismo al nacionalismo: rumbos del conflicto armado en Colombia

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    Mónica Zuleta P.

    2003-10-01

    Full Text Available Este ensayo tiene por propósito sugerir una interpretación del desarrollo del conflicto armado colombiano durante la última década del siglo XX mediante el uso de la concepción de poder de Michel Foucault. Ello con miras a presentar alternativas analíticas frente a la relación entre lo global y lo local donde se consideren algunas de las hipótesis contemporáneas sobre la cuestión del nacionalismo. El ensayo utiliza el término nacionalismo como sustantivo (lo que es en lugar de como adjetivo (lo que debe ser y ordena los conjuntos de acciones que, en torno al proyecto de lo nacional, han sido puestos en práctica por las guerrillas en Colombia.

  6. Gestión del riesgo del cambio (primera parte

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    Juan Pablo Zorrilla

    2007-07-01

    Full Text Available A partir de la desaparición del sistema Bretton-Woods, y la libre flotación del tipo de cambio, el mundo se volvió más susceptible a todo tipo de riesgos. El presente artículo pretende explicar a los gestores financieros o empresarios interesados en el tema de instrumentos financieros derivados, a conocer lo más relevante y necesario acerca del uso de futuros sobre el tipo de cambio, instrumento útil para cubrir riesgos derivados del tipo de cambio para las empresas que se dedican a importar, exportar o para protegerse de un crédito otorgado en moneda extranjera.

  7. Calidad del software: camino hacia una verdadera industria del software

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    Saulo Ernesto Rojas Salamanca

    1999-07-01

    Full Text Available El software es quizá uno de los productos de la ingeniería que más ha evolucionado en muy poco tiempo, pasando desde el software empírico o artesanal hasta llegar al software desarrollado bajo los principios y herramientas de la ingeniería del software. Sin embargo, dentro de estos cambios, las personas encargadas de la elaboración del software se han enfrentado a problemas muy comunes: unos debido a la exigencia cada vez mayor en la capacidad de resultados del software, debido al permanente cambio de condiciones lo que aumenta su complejidad y obsolescencia; y otros, debido a la carencia de herramientas adecuadas y estándares de tipo organizacional encaminados al mejoramiento de los procesos en el desarrollo del software. Hacia la búsqueda de mecanismos de solución de estos últimos problemas se orienta este artículo...

  8. Perspectivas del derecho procesal constitucional

    OpenAIRE

    Hernández-Villarreal, Gabriel-Angel

    2007-01-01

    Este texto recoge las ponencias que participaron en el Foro Internacional de Derecho Procesal Constitucional, que con gran éxito se realizó en el mes de junio de 2005, en las aulas de la Universidad Colegio Mayor de Nuestra Señora del Rosario de Bogotá; razón por la cual contiene el fruto maduro de las investigaciones realizadas por algunos de los más notables exponentes del derecho procesal constitucional en América del Sur. El lector de esta obra se encontrará con riguroso trabajo sobre alg...

  9. Contabilidad del impuesto sobre beneficios

    OpenAIRE

    Luceño Martínez, Haizea

    2017-01-01

    Este Trabajo Fin de Grado pretende dar una explicación al tratamiento contable del Impuesto de Sociedades. Siendo un impuesto que hay que contabilizar, pero que se calcula siguiendo criterios fiscales, lleva a tener que realizar ajustes que tendrán su repercusión contable. El punto de partida no es otra que la norma de registro y valoración 13ª del PGC, que versa sobre cómo hay que proceder a contabilizar el Gasto por Impuesto de Sociedades, que se compone tanto del Gasto por Impuesto Co...

  10. Entrenamiento funcional del core: eje del entrenamiento inteligente

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    Iván Dario Pinzón Ríos

    2015-06-01

    Full Text Available Antecedentes: La evolución del entrenamiento físico busca la optimización de la salud y el bienestar, como piedra angular de todo programa de ejercicio. El Entrenamiento Funcional (EF es recomendable para optimizar el control postural del core, mejorando el balance y la ejecución de actividades de la vida diaria.  Objetivo: Revisar la definición, elementos constitutivos, características e implicaciones del EF del core en el movimiento corporal humano (MCH y la salud desde la perspectiva del fisioterapeuta. Metodología: Se incluyeron artículos en inglés y español de las bases Pubmed, Scielo y Ebsco; adicionalmente se incluyeron fuentes electrónicas e impresas y libros. Resultados: 56 documentos cumplieron los criterios de inclusión. La definición más adoptada de EF fue entrenar con un propósito buscando obtener un efecto positivo en la aptitud física. Las implicaciones del EF en el MCH, se relacionan con la ganancia y mejoría de la estabilidad. La propuesta de EF enfocada a las actividades de la vida diaria incluye fases que permiten adquirir la estabilidad hasta lograr el desarrollo de movimiento que demanden más agilidad. En la planificación del EF se deben estructurar los procesos a ejecutar considerando el criterio de funcionalidad. Para organizar la sesión del EF, el fisioterapeuta cuenta con tres maneras de planificar la sesión: globales, por hemisferios y por grupos musculares. Conclusión: La fundamentación teórica sobre el EF permite al fisioterapeuta comprender y determinar cómo esta modalidad de intervención repercute de manera positiva sobre el desempeño funcional y calidad de vida de los sujetos.

  11. Aspectos Hardware y Software del microprocesador 68000

    OpenAIRE

    Alcaraz Martínez, Raúl

    2009-01-01

    INTRODUCCIÓN AL 68000.ORGANIZACIÓN INTERNA DEL 68000. PROGRAMACIÓN DEL 68000 EN LENGUAJE ENSAMBLADOR. ORGANIZACIÓN EXTERNA DEL 68000. EXCEPCIONES. PROGRAMACIÓN DE LA VÍA 6522. PROGRAMACIÓN DE LA DUART 68681 PARA COMUNICACIÓN SERIE. EVOLUCIÓN DEL 68000

  12. La finalidad del proceso

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    Iván Alfonso Cordero Gutiérrez

    2011-07-01

    Full Text Available Resumen:El tipo de Estado que Colombia asumió desde 1991 (Estado Social de Derecho, implica que el cumplimiento de los fines estatales se comparten con la población, generando de esta forma grados de responsabilidad respecto a las cargas asumidas por ellos y el Estado para la materialización de los objetivos planteados. La satisfacción de las necesidades básicas de la población como unode los fines esenciales del Estado Social de Derecho, no escapa a este esquema, lo que determina la colaboración armónica no sólo entre las entidades y organismos del Estado sino de este, complementado con la población. Una de las necesidades básicas de la población, se refiere a la posibilidad de resolver sus conflictos haciendo uso de los mecanismos que para tal efecto tiene a su disposición, utilizando las formas de Auto tutela, Autocomposición, híbridas y de Heterocomposiciòn, que el Estado autoriza,de acuerdo a los lineamientos propios de cada mecanismo, respecto a las materias que componen los derechos sustanciales que se debaten en la relación conflictiva. Dentro de estos mecanismos de solución de conflictos, la heterocomposiciòn presenta uno llamado el proceso jurisdiccional, en donde un tercero investido de poderes específicos ejerce la jurisdicción y toma la decisión respecto al conflicto, después del agotamiento de etapas sucesivas y preclusivas que garantizan la efectiva participación, ejercicio y defensa de los derechos fundamentales y sustanciales de las partes, generando una mayor garantía de legalidad respecto a la decisión generada por ese tercero investido de plena Jurisdicción (el Juez. Por ser el proceso jurisdiccional el mecanismo más idóneo por su garantismo reglado y tecnificado, debe ser protegido, fortalecido y preferente respecto a los denominados equivalentesjurisdiccionales pues con estos el Estado pretende desplazar la competencia al momento de la resolución de los conflictos, generando un

  13. Hacia una conceptualización del legado del traductor

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    Guzmán María Constanza

    2009-06-01

    Full Text Available Este artículo se propone investigar el aporte de perspectivas traductológicas para el estudio de la figura del traductor y su legado. Se centra en enfoques teóricos contemporáneos, principalmente aquellos basados en perspectivas postestructuralistas, que consideran el papel del sujeto traductor como un aspecto crucial en la traducción y los estudios literarios, y proponen maneras interesantes de abordarlo. A lo largo del artículo se cuestionan nociones como la idea de un original sacralizado, la relación entre autoría y propiedad, el ideal del significado transparente, y la tensión entre la traducción y la escritura del "original". Se presta especial atención a la importancia de ubicar históricamente la práctica del traductor, reconocer su papel como agente visible, y conceptualizar la traducción como una forma de escritura que se desarrolla en medio de complejas interacciones y negociaciones.

  14. HACIA UNA CONCEPTUALIZACIÓN DEL LEGADO DEL TRADUCTOR

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    María Constanza Guzmán

    2009-01-01

    Full Text Available Este artículo se propone investigar el aporte de perspectivas traductológicas para el estudio de la figura del traductor y su legado. Se centra en enfoques teóricos contemporáneos, principalmente aquellos basados en perspectivas postestructuralistas, que consideran el papel del sujeto traductor como un aspecto crucial en la traducción y los estudios literarios, y proponen maneras interesantes de abordarlo. A lo largo del artículo se cuestionan nociones como la idea de un original sacralizado, la relación entre autoría y propiedad, el ideal del significado transparente, y la tensión entre la traducción y la escritura del "original". Se presta especial atención a la importancia de ubicar históricamente la práctica del traductor, reconocer su papel como agente visible, y conceptualizar la traducción como una forma de escritura que se desarrolla en medio de complejas interacciones y negociaciones.

  15. Ensayo del lisado de amebocitos del Limulus (LAL

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    Rolando Perdomo Morales

    2004-04-01

    Full Text Available En los últimos años, los principales organismos reguladores de productos farmacéuticos (Farmacopeas exigen cada vez más en sus monografías la aplicación del método del lisado de amebocitos de Limulus (LAL para la liberación de pirógenos en productos terminados parenterales. El análisis de pirógenos constituye uno de los principales ensayos en el control de calidad de la fabricación de inyectables por su repercusión en la salud humana, puesto que la presencia y administración de los mismos, es capaz de provocar una serie de respuestas fisiológicas, en su mayoría de carácter perjudicial y en casos extremos, la muerte del paciente. Por las razones anteriores, existe un creciente interés en el conocimiento y dominio de estos métodos. El presente trabajo muestra una revisión bibliográfica del método del LAL, se tratan aspectos como su descubrimiento y estandarización, aparición en la industria farmacéutica y razones para su triunfo, y los basamentos de los principales métodos o variaciones comerciales del LAL (gelificación, turbidimétricos y cromogénicos que se describen en las Farmacopeas.

  16. Ensayo del lisado de amebocitos del Limulus (LAL

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    Rolando Perdomo Morales

    Full Text Available En los últimos años, los principales organismos reguladores de productos farmacéuticos (Farmacopeas exigen cada vez más en sus monografías la aplicación del método del lisado de amebocitos de Limulus (LAL para la liberación de pirógenos en productos terminados parenterales. El análisis de pirógenos constituye uno de los principales ensayos en el control de calidad de la fabricación de inyectables por su repercusión en la salud humana, puesto que la presencia y administración de los mismos, es capaz de provocar una serie de respuestas fisiológicas, en su mayoría de carácter perjudicial y en casos extremos, la muerte del paciente. Por las razones anteriores, existe un creciente interés en el conocimiento y dominio de estos métodos. El presente trabajo muestra una revisión bibliográfica del método del LAL, se tratan aspectos como su descubrimiento y estandarización, aparición en la industria farmacéutica y razones para su triunfo, y los basamentos de los principales métodos o variaciones comerciales del LAL (gelificación, turbidimétricos y cromogénicos que se describen en las Farmacopeas.

  17. HACIA UNA CONCEPTUALIZACIÓN DEL LEGADO DEL TRADUCTOR

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    María Constanza Guzmán

    2009-06-01

    Full Text Available Este artículo se propone investigar el aporte de perspectivas traductológicas para el estudio de la figura del traductor y su legado. Se centra en enfoques teóricos contemporáneos, principalmente aquellos basados en perspectivas postestructuralistas, que consideran el papel del sujeto traductor como un aspecto crucial en la traducción y los estudios literarios, y proponen maneras interesantes de abordarlo. A lo largo del artículo se cuestionan nociones como la idea de un original sacralizado, la relación entre autoría y propiedad, el ideal del significado transparente, y la tensión entre la traducción y la escritura del "original". Se presta especial atención a la importancia de ubicar históricamente la práctica del traductor, reconocer su papel como agente visible, y conceptualizar la traducción como una forma de escritura que se desarrolla en medio de complejas interacciones y negociaciones.

  18. Instalaciones del edificio de Costillares

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    Laorden, José

    1999-08-01

    Full Text Available Not available

    Se describen las instalaciones de calefacción y refrigeración, fontanería, gas, central eléctrica, iluminación, teléfonos y aislamiento térmico del edificio construido en Chamartín de la Rosa para sede del instituto Técnico de la Construcción y del Cemento, dando las consideraciones generales que sirvieron para proyectarlas y analizando después para cada una de ellas las bases del proyecto, su ejecución y, finalmente, los primeros resultados de su funcionamiento. De especial interés creemos los comentarios que hacemos sobre algunos errores de proyecto o de ejecución, con lo cual quizá se puedan evitar en otros trabajos.

  19. Virus del Ébola

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    Miguel Lugones Botell

    Full Text Available En la actualidad, el panorama epidemiológico internacional se presenta con enfermedades infecciosas graves como el Ébola. Recientemente han ocurrido brotes en tres países del África Occidental, por lo que la Organización Mundial de la Salud ha insistido acerca del peligro que existe sobre la expansión y gravedad de esta epidemia. Se realizó una revisión bibliográfica del tema con el objetivo de actualizar al médico sobre aspectos esenciales de la fiebre hemorrágica o enfermedad del Ébola. Los índices de letalidad se encuentran entre el 50 y 90 %, por lo que la Organización Mundial de la Salud hace énfasis en la importancia de la prevención mediante la higiene, lo que constituye un aspecto clave.

  20. TEA, Trastorno del Espectro Autista :

    OpenAIRE

    Vegas Martín, Irene

    2015-01-01

    La autora expone los aspectos fundamentales sobre el concepto del TEA para posteriormente mostrarnos un caso práctico y su tratamiento durante unos meses con la finalidad que sea un trabajo de consulta práctico