Mostrando recursos 1 - 20 de 2,823

  1. Influencia de Drechslera tritici-repentis, sobre la removilización y absorción post-antesis de nitrógeno en distintos cultivares de trigo

    Bellocq, Juan Francisco
    El trigo pan (Triticum aestivum (L) Thell.) es un cereal básico para la alimentación humana. El crecimiento poblacional conlleva un aumento en la demanda de este cereal de ahí la necesidad de aumentar la producción mundial elevando los rendimientos promedios. La mancha amarilla causada por el hongo [Pyrenophora tritici-repentis (Died.) Drechs., anamorfo Drechslera tritici-repentis) (Died.) Shoem.] es una de las enfermedades foliares más importantes del cultivo debido a las mermas en el rendimiento que produce. El objetivo del trabajo fue evaluar el efecto de la mancha amarilla sobre la removilización y absorción de nitrógeno post-antesis en diez cultivares de trigo....

  2. Análisis del uso de agroquímicos asociado a las actividades agropecuarias de la provincia de Buenos Aires

    Sarandón, Santiago J.
    Teniendo en cuenta la importancia de las actividades agropecuarias para el ambiente, es fundamental realizar un relevamiento de la utilización de los agroquímicos y hacer un seguimiento profundo de los impactos que la intensificación de la agricultura está produciendo sobre extensas áreas de la Provincia de Buenos Aires. Teniendo en cuenta que la Defensoría del Pueblo de la Provincia de Buenos Aires debe garantizar el derecho a un ambiente sano, al agua potable, y a la salud, derechos humanos básicos inherentes a la dignidad e integridad del ser humano, es necesario mejorar el conocimiento sobre el impacto que diferentes prácticas...

  3. Escuela agroecológica “Semilla en la Tierra”, una alternativa pedagógica para la construcción de paz con justicia social

    Cancino, J. M.; Cantor, M. I.
    En medio de un país, con territorio mayoritariamente rural en el cual las comunidades se encuentran sumidas en la desigualdad y deplorables condiciones de vida, el Colectivo de Integración Rural (CIR) de la Universidad Nacional de Colombia (Sede Bogotá), crea, al interior de la Facultad de Ciencias Agrarias, la escuela de agroecología: “Semilla en la tierra”. Esta tiene como objetivo discutir sobre las alternativas que permitan mejorar las condiciones de vida de estas comunidades, a traves de propuestas en torno a la agroecología. Este espacio se complementa con experiencias de trabajo organizativo con organizaciones campesinas y talleres desarrollados con comunidades...

  4. Convergence of soil nitrogen isotopes across global climate gradients

    Craine, Joseph M.; Division of Biology, Kansas State University; Elmore, Andrew J.; Appalachian Laboratory, University of Maryland Center for Environmental Science; Koba, Keisuke; Institute of Agriculture, Tokyo University of Agriculture and Technology; Kranabetter, J. Marty; British Columbia Ministry of Forests, Lands and Natural Resource Operations; Mack, Michelle C.; Department of Biology, University of Florida; Marin-Spiotta, Erika; Department of Geography, University of Wisconsin; Mayor, Jordan R.; Department of Forest Ecology & Management, Swedish University of Agricultural Sciences; McLauchlan, Kendra K.; Department of Geography, Kansas State University; Michelsen, Anders; Department of Biology, University of Copenhagen; Nardoto, Gabriela B.; Faculdade UnB Planaltina, Universidade de Brasília; Oliveira, Rafael S.; Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas; Perakis, Steven S.; Forest and Rangeland Ecosystem Science Center, US Geological Survey; Wang, Lixin; Department of Earth Sciences, Indiana University-Purdue University; Peri, Pablo L.; Universidad Nacional de la Patagonia Austral-INTA-CONICET; Quesada, Carlos A.; Coordenação de Dinâmica Ambiental, Instituto Nacional de Pesquisas da Amazonia; Richter, Andreas; Department fur Mikrobiologie und Okosystemforschung, Fakultat fur Lebenswissenschaften, University of Vienna; Department fur Mikrobiologie und Okosystemforschung, Fakultat fur Lebenswissenschaften, University of Vienna; Schipper, Louis A.; Environmental Research Institute, University of Waikato; Stevenson, Bryan A.; Landcare Research; Turner, Benjamin L.; Smithsonian Tropical Research Institute; Viani, Ricardo A. G.; DBPVA, Centro de Ciências Agrárias, Universidade Federal de São Carlos; Wanek, Wolfgang; Department fur Mikrobiologie und Okosystemforschung, Fakultat fur Lebenswissenschaften, University of Vienna; Department fur Mikrobiologie und Okosystemforschung, Fakultat fur Lebenswissenschaften, University of Vienna; Zeller, Bernd; Biogéochimie des Ecosystèmes Forestiers, INRA Nancy; Augusto, Laurent; University of Vienna; University of Vienna; Baisden, W. Troy; National Isotope Centre, GNS Science, New Zealand; Brookshire, E. N. J.; Department of Land Resources and Environmental Sciences, Montana State University; Cramer, Michael D.; Department of Biological Sciences, University of Cape Town; Hasselquist, Niles J.; Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU); Hobbie, Erik A.; Earth Systems Research Center, University of New Hampshire; Kahmen, Ansgar; Departement of Environmental Sciences - Botany, Basel
    Quantifying global patterns of terrestrial nitrogen (N) cycling is central to predicting future patterns of primary productivity, carbon sequestration, nutrient fluxes to aquatic systems, and climate forcing. With limited direct measures of soil N cycling at the global scale, syntheses of the 15N:14N ratio of soil organic matter across climate gradients provide key insights into understanding global patterns of N cycling. In synthesizing data from over 6000 soil samples, we show strong global relationships among soil N isotopes, mean annual temperature (MAT), mean annual precipitation (MAP), and the concentrations of organic carbon and clay in soil. In both hot ecosystems...

  5. The Eukaryotic Flagellum Makes the Day: Novel and Unforeseen Roles Uncovered After Post-Genomics and Proteomics Data

    Michely C. Diniz; Ana Carolina; L. Pacheco; Kaio M. Farias; Diana M. De Oliveira; Vale São Francisco-univasf; Campi Ciências; Agrárias-rodovia Br
    Abstract: This review will summarize and discuss the current biological understanding of the motile eukaryotic flagel-lum, as posed out by recent advances enabled by post-genomics and proteomics approaches. The organelle, which is cru-cial for motility, survival, differentiation, reproduction, division and feeding, among other activities, of many eukaryotes, is a great example of a natural nanomachine assembled mostly by proteins (around 350-650 of them) that have been con-served throughout eukaryotic evolution. Flagellar proteins are discussed in terms of their arrangement on to the axoneme, the canonical “9+2 ” microtubule pattern, and also motor and sensorial elements that have been detected by...

  6. Comercialización y producción; de las familias productoras a las familias consumidoras

    Bravo, María Laura; Cremaschi, Almendra
    Durante los últimos 25 años el Cinturón Hortícola Platense, Buenos Aires, Argentina, ha atravesado significativos cambios en las formas de producción, la estructura de los mercados y la concentración de la tierra. Estas transformaciones significaron un aumento de la dependencia de insumos, reducción del poder de negociación de las familias productoras frente a los últimos eslabones de la cadena y dificultades para el acceso a la tierra. Así, la producción familiar se ha visto vulnerable ante un sector cada vez más polarizado. En este contexto, a partir de un proyecto de la Facultad de Ciencias Agrarias y Forestales (UNLP), surgió...

  7. for

    Juliana Morini; Gliciane Micaele; Borges Silva; João Ricardo; Bachega Feijó; Rodrigo Gazaffi; Jéssica Fern; A Marçal; Sérgio Augusto; Morais Carbonell; Alisson Fern; Maria Imaculada Zucchi; Antonio Augusto; Franco Garcia; Luciana Lasry Benchimol-reis; Centro De Ciências Agrárias
    a common bean core collection suitable

  8. Universidade Federal do Espírito Santo, Centro de Ciências Agrárias

    Wilmer Edgard; Luera Peña; Pilar Rodriguez De Massaguer; Luciano Quintão Teixeira
    The nisin effect on thermal death of Alicyclobacillus acidoterrestris CRA 7152 spores in concentrated orange juice (64°Brix) was studied. Concentrations of 0, 50, 75 and 100 IU of nisin/ml juice, at temperatures of 92, 95, 98 and 102ºC were evaluated. The quadratic polynomial model was used to analyze the effects of the factors and their interaction. Verification of surviving spores was carried out through plating in K medium (pH 3.7). The results showed that the D values without nisin addition were 25.5, 12.9, 6.1 and 2.3 min for 92, 95, 98 and 102ºC respectively. With addition of nisin into the...

  9. Edited by:

    Ludmilla B. Zavarez; Yuri T. Utsunomiya; Adriana S. Carmo; Haroldo H. R. Neves; Roberto Carvalheiro; Ana M. Pérez O’brien; Ino Curik; John B. Cole; Curtis P. Van Tassell; Tad S. Sonstegard; Johann Sölkner; José F. Garcia; Paolo Ajmone Marsan; Cattolica Del S. Cuore; Nicolo Pietro; Paolo Macciotta; José F. Garcia; Laboratório De
    Assessment of autozygosity in Nellore cows (Bos indicus)

  10. Edited by:

    Jesús Álvarez; José L. Acebes; José L. Acebes; Área De Fisiología; Ciencias Agrarias; Facultad De
    doi: 10.3389/fpls.2014.00303 Fourier transform mid infrared spectroscopy applications for monitoring the structural plasticity of plant cell walls

  11. Detection of Salmonella spp, Salmonella Enteritidis and Typhimurium in naturally infected broiler chickens by a multiplex PCR-based assay

    F. G. Paião; L. G. A. Arisitides; L. S. Murate; G. T. Vilas-bôas; L. A. Vilas-boas; M. Shimokomaki; Centro De Ciências Agrárias
    The presence of Salmonella in the intestinal tract, on the chickens skin and among their feathers, may cause carcasses contamination during slaughtering and processing and possibly it is responsible by the introduction of this microorganism in the slaughterhouses. A rapid method to identify and moni-tor Salmonella and their sorovars in farm is becoming necessary. A pre-enriched multiplex polymer-ase chain reaction (m-PCR) assay employing specific primers was developed and used to detect Salmonella at the genus level and to identify the Salmonella enterica serovar Enteritidis (S. Enteritidis) and Salmonella enterica serovar Typhimurium (S. Typhimurium) in broiler chicken swab samples. The method...

  12. *Correspondence:

    Sara Rocha; Paulo Monjardino; Duarte Mendonça; Artur Da Câmara Machado; Rui Fern; Paula Sampaio; Roberto Salema; Mark Talbot; Csiro Plant Industry; Paulo Monjardino; Ciências Agrárias; Biotecnologia E Bioengenharia
    doi: 10.3389/fpls.2014.00102 Lignification of developing maize (Zea mays L.) endosperm transfer cells and starchy endosperm cells

  13. Departamento de Desarrollo Rural- Facultad de Ciencias Agrarias y Forestales- UNLP

    Otero Jeremías; Patricio Vértiz; Juan José Garat; Irene Velarde; Jeremías Otero; Equipo Investigación; Tag Lugar; Innova Unlp; La Plata
    Abstract: This paper examines the Localized Agro-alimentary Systems approach as an alternative for the study and development of rural territories, where it is recognized as a resource in this sense, culture and local economy associated with a typical agri-food product. This proposal is presented in a context where intensifies delocalization of production activities.

  14. Sorghum growth in soil treated with sewage sludge from the textile industry

    W. J. Melo; G. M. P. Melo; V. P. Melo; M. M. Yada; R. S. Carlos; E. G. Silva; Ciências Agrárias
    Sewage sludge (SS), a residue from wastewater treatment can be a hazard to the environment because it may contain trace elements and other toxic substances. But it is also rich in organic matter and plant nutrients so that an attractive destination for the residue is its use in agriculture as fertilizer and soil conditioner. The aim of this work was to evaluate the effect of doses of SS from the textile industry on sorghum plant growth. The experiment was carried out under greenhouse conditions using typic Haplorthox soil occurring at Jaboticabal, SP, Brazil. The experiment design was totally randomized with...

  15. Desenvolvimento de um aditivo natural à base de catequina: otimização da extração e estabilização a partir de frutos de Arbutus unedo L.

    Albuquerque, Bianca Rodrigues de
    The common Mediterranean ornamental strawberry-tree (Arbutus unedo L.) produces an edible reddish sweet berry that is found to be bland and tasteless unless it is consumed overripe, otherwise it is discarded or used as basic agricultural sub residue. The bioactive properties of this fruit have been reported and related with phenolic compounds, mainly flavan-3-ols, such as catechin and procyanidins, which has opened the opportunity to exploit their extraction from alternative sources.The common Mediterranean ornamental strawberry-tree (Arbutus unedo L.) produces an edible reddish sweet berry that is found to be bland and tasteless unless it is consumed overripe, otherwise it is...

  16. Low molecular weight compounds from mushrooms as potential Bcl-2 inhibitors: docking and virtual screening studies

    Khelifa, Sabrine
    Mushrooms have the ability to promote apoptosis in tumor cell lines, but the mechanism of action is not quite well understood. Inhibition of the interaction between Bcl-2 and pro-apoptotic proteins could be an important step that leads to apoptosis. Therefore, the discovery of compounds with the ability to inhibit Bcl-2 is an ongoing research topic in drug discovery. In this study, we started by analyzing Bcl-2 experimental structures that are currently available in Protein Data Bank database. After analysis of the more relevant Bcl-2 structures, 4 were finally selected. An analysis of the best docking methodology was then performed using...

  17. Evaluación de variedades de maíz blanco en la región Brunca de Costa Rica: experimentación campesina.

    Munguía Ulloa, Sayra; Saborío, Juan Carlos; Cárdenas, Hernando
    Different genetic materials of corn, including local and improved varieties, were evaluated in two communities of the Brunca region, during the summer from September 1999 to February 2000. This activity was conducted by farmers of the Associations of Veracruz dePejibaye (six farmers) and Concepcion de Pilas (four farmers), with the support of the "Escuela de Ciencias Agrarias" (ECA), the "Instituto para el Desarrollo y la Acción Social" (IDEAS) and the cooperation of the "Ministerio de Agricultura y Ganadería" (MAG). The hybrid Cargill 343, the improved variety Diamantes 8843 and three local varieties(Godo, Mena and Elizondo) were tested in the Veracruz...

  18. Studies on bovine oocytes and ovarian tissues cryopreservation : fundamental and applied aspects

    Faheem, Marwa Said
    Tese de Doutoramento, Ciências Agrárias (Reprodução Animal), 26 de Junho de 2013, Universidade dos Açores.

  19. Obtenção de extratos de agaricus bisporus com ergosterol para incorporação em iogurtes e procedimentos de microencapsulação

    Rudke, Adenilson Renato
    Além de ser o cogumelo mais consumido no mundo, Agaricus bisporus é um dos cogumelos mais ricos em ergosterol, representando esta molécula quase 90% da sua fração de esteróis. Vários estudos têm atribuído ao ergosterol diferentes bioatividades, incluindo efeitos hipocolesterolémicos semelhantes aos exibidos pelos fitoesteróis. Isto torna o ergosterol uma molécula interessante para ser estudada como composto nutracêutico. Assim, este trabalho teve como objetivo avaliar o potencial de utilização dos extratos de A. bisporus ricos em ergosterol na produção de bebidas lácteas funcionais. Para o efeito, foram realizados testes de incorporação do extrato e do ergosterol puro em iogurtes que...

  20. The broad spectrum of bioactive properties of phenolic extracts: a prospective study in three different plants

    Jabeur, Inès
    Natural resources like plants are currently used all over developed and under developed countries of the world as traditional home remedies and are promising agents for drug discovery as they play crucial role in traditional medicine. The use of plants for medicinal purpose usually varies from country to country and region to region because their use depends on the history, culture, philosophy and personal attitudes of the users (Ahmad et al., 2015). The use of plants and plant products as drugs predates the written human history (Hayta et al., 2014). Plants are a very important resource for traditional drugs and around...

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