Suchergebnisse

<p>El artículo busca aportar al estudio de la cooperación científico-tecnológica internacional desde y para América Latina. En éste, se organizan y exponen los aportes encontrados en la revisión de la literatura reciente en torno de distintas dimensiones que contribuyen a repensar las características y el rol de la cooperación científico-tecnológica en las naciones latinoamericanas. Tales aportes son las conceptualizaciones del desarrollo, las miradas sobre la cooperación internacional y la caracterización de los modos de producción de conocimientos. Estos aportes permiten reflexionar sobre diversos ejes de la cooperación científico-tecnológica internacional en América Latina. Así, se estudia para qué cooperar internacionalmente en materia científico-tecnológica, en el marco de las distintas concepciones de desarrollo; con quiénes cooperar en ciencia y tecnología en el ámbito internacional —cuestionando la asociación con contrapartes tradicionales y dando paso a relaciones más horizontales con socios alternativos— y cómo cooperar, a partir de organizaciones y actores emergentes en los nuevos modos de producción de conocimiento.</p>

The aim of this paper is to analyze recent changes in Bolivia's science and technology policy and contextualize them in the surrounding region. It is recognized that since the 1980s, Latin America initiated a series of changes in its science and technology policies driven by the needs of the economic accumulation regime prevalent and based on new theories of innovation. Policies placed their emphasis on the application of scientific technology in order to boost national competitiveness. During the 1990s, a closer link was established between the neoliberal regime of accumulation, science and technology policies, and the concept of innovation. The outcry from various social movements subsequently demanded a refocus of these policies towards a more regional and social orientation. The emergence of governments more critical of neoliberalism resulted in the need to rethink science and technology policies as shown by the experience of Brazil, Argentina, Venezuela, Bolivia and Ecuador. The transitional case of Bolivia is examined here so as to contribute to the larger discussion concerning Latin America's science and technology policies.

Botanical and fungal biopesticides, including endophytes, are in high demand given the current restrictive legislations on the use of chemical pesticides. As part of an ongoing search for new biopesticides, a series of fungal endophytes have been isolated from selected medicinal plants including Lauraceae species. In the current study, an extract from the endophytic fungus Trichoderma sp. EFI 671, isolated from the stem parts of the medicinal plant Laurus sp., was screened for bioactivity against plant pathogens (Fusarium graminearum, Rhizoctonia solani, Sclerotinia sclerotiorum and Botrytis cinerea), insect pests (Spodoptera littoralis, Myzus persicae, Rhopalosiphum padi) and plant parasites (Meloidogyne javanica), with positive results against M. persicae. The chemical study of the neutral fraction of the active hexane extract resulted in the isolation of a triglyceride mixture (m1), eburicol (2), β-sitostenone (3), ergosterol (4) and ergosterol peroxide (5). The free fatty acids present in the acid fraction of the extract and in m1 (oleic, linoleic, palmitic and stearic) showed strong dose-dependent antifeedant effects against M. persicae. Liquid (potato dextrose broth, PDB and Sabouraud Broth, SDB) and solid (corn, sorghum, pearl millet and rice) growth media were tested in order to optimize the yield and bioactivity of the fungal extracts. Pearl millet and corn gave the highest extract yields. All the extracts from these solid media had strong effects against M. persicae, with sorghum being the most active. Corn media increased the methyl linoleate content of the extract, pearl millet media increased the oleic acid and sorghum media increased the oleic and linoleic acids compared to rice. The antifeedant effects of these extracts correlated with their content in methyl linoleate and linoleic acid. The phytotoxic effects of these extracts against ryegrass, Lolium perenne, and lettuce, Lactuca sativa, varied with culture media, with sorghum being non- toxic. ; This work has been supported by grants from Department of Science and Technology (Grant noDST/INT/SPAIN/P-3/-9); Department of Biotechnology (Grant No. BT/PR9324/NDB/39/334/2013); ACI2009-0900(MCIN), I-Coop Agrofood-2014 CD0015 (CSIC), CTQ2015-64049-C3-1-R (MINECO/FEDER); and JAE-CSIC(predoctoral fellowship to L.F. Julio). ; Peer reviewed

Botanical and fungal biopesticides, including endophytes, are in high demand given the current restrictive legislations on the use of chemical pesticides. As part of an ongoing search for new biopesticides, a series of fungal endophytes have been isolated from selected medicinal plants including Lauraceae species. In the current study, an extract from the endophytic fungus Trichoderma sp. EFI 671, isolated from the stem parts of the medicinal plant Laurus sp., was screened for bioactivity against plant pathogens (Fusarium graminearum, Rhizoctonia solani, Sclerotinia sclerotiorum and Botrytis cinerea), insect pests (Spodoptera littoralis, Myzus persicae, Rhopalosiphum padi) and plant parasites (Meloidogyne javanica), with positive results against M. persicae. The chemical study of the neutral fraction of the active hexane extract resulted in the isolation of a triglyceride mixture (m1), eburicol (2), &beta ; -sitostenone (3), ergosterol (4) and ergosterol peroxide (5). The free fatty acids present in the acid fraction of the extract and in m1 (oleic, linoleic, palmitic and stearic) showed strong dose-dependent antifeedant effects against M. persicae. Liquid (potato dextrose broth, PDB and Sabouraud Broth, SDB) and solid (corn, sorghum, pearl millet and rice) growth media were tested in order to optimize the yield and bioactivity of the fungal extracts. Pearl millet and corn gave the highest extract yields. All the extracts from these solid media had strong effects against M. persicae, with sorghum being the most active. Corn media increased the methyl linoleate content of the extract, pearl millet media increased the oleic acid and sorghum media increased the oleic and linoleic acids compared to rice. The antifeedant effects of these extracts correlated with their content in methyl linoleate and linoleic acid. The phytotoxic effects of these extracts against ryegrass, Lolium perenne, and lettuce, Lactuca sativa, varied with culture media, with sorghum being non- toxic.

Este libro digital se dirige a la labor científica desarrollada por gallegos miembros del estamento militar y, también, la realizada en Galicia, a pesar de no tener sus protagonistas origen gallego. Busca, por una parte, difundir y poner en valor la trayectoria científica de figuras nacidas en tierras gallegas que prestaron servicios o se formaron en el ámbito militar y, por otra, reconocer el desarrollo experimentado en Galicia allí donde se asentaron instituciones militares que contribuyeron a su progreso cultural, científico y también económico. La obra deriva de las exposiciones públicas promovidas y organizadas en 2018 y 2019 por los propios autores y financiadas por el Ministerio de Defensa en las convocatorias de Cultura en Defensa de 2018 (expediente 130-10237) y 2019 (expediente 130-14189). [Texto de la editorial]

Botanical and fungal biopesticides, including endophytes, are in high demand given the current restrictive legislations on the use of chemical pesticides. As part of an ongoing search for new biopesticides, a series of fungal endophytes have been isolated from selected medicinal plants including Lauraceae species. In the current study, an extract from the endophytic fungus Trichoderma sp. EFI 671, isolated from the stem parts of the medicinal plant Laurus sp., was screened for bioactivity against plant pathogens (Fusarium graminearum, Rhizoctonia solani, Sclerotinia sclerotiorum and Botrytis cinerea), insect pests (Spodoptera littoralis, Myzus persicae, Rhopalosiphum padi) and plant parasites (Meloidogyne javanica), with positive results against M. persicae. The chemical study of the neutral fraction of the active hexane extract resulted in the isolation of a triglyceride mixture (m1), eburicol (2), β-sitostenone (3), ergosterol (4) and ergosterol peroxide (5). The free fatty acids present in the acid fraction of the extract and in m1 (oleic, linoleic, palmitic and stearic) showed strong dose-dependent antifeedant effects against M. persicae. Liquid (potato dextrose broth, PDB and Sabouraud Broth, SDB) and solid (corn, sorghum, pearl millet and rice) growth media were tested in order to optimize the yield and bioactivity of the fungal extracts. Pearl millet and corn gave the highest extract yields. All the extracts from these solid media had strong effects against M. persicae, with sorghum being the most active. Corn media increased the methyl linoleate content of the extract, pearl millet media increased the oleic acid and sorghum media increased the oleic and linoleic acids compared to rice. The antifeedant effects of these extracts correlated with their content in methyl linoleate and linoleic acid. The phytotoxic effects of these extracts against ryegrass, Lolium perenne, and lettuce, Lactuca sativa, varied with culture media, with sorghum being non- toxic.