Una aproximaci??n historiogr??fica sobre el origen de los estudios de la ??caja negra?? : las investigaciones del aula desde la historia de la educaci??n en Gran Breta??a y EEUU

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Videojuegos y educaci??n : una visi??n panor??mica de las investigaciones desarrolladas a nivel internacional

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Evoluci??n de las investigaciones sobre la ense??anza de las actividades en el medio natural en educaci??n f??sica escolar

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El aparecimiento del saber histórico en Guayaquil: el Centro de Investigaciones Históricas (1930-1962) [Estudios]

El artículo analiza la producción historiográfica guayaquileña aparecida en el Boletín del Centro de Investigaciones Históricas. Primeramente, se realiza un acercamiento al contexto sociocultural de la ciudad-puerto entre 1930 y 1960. Seguidamente, se estudia la creación del Centro de Investigaciones Históricas y el aparecimiento del Boletín, la primera publicación especializada en su ámbito, su contenido y los temas que atrajeron la atención de sus colaboradores. Finalmente se explora la influencia de esta institución en las conmemoraciones locales.

Desempenho de novilhos alimentados com dieta suplementar em pastos de capim-mombaça

The objective of this work was to evaluate the effect of supplements feeding on growth of calves grazing a Panicum maximum cv. Mombaça pasture during the dry season. The experimental design was a randomized blocks with three treatments and three replications. The treatments were: mineral salt ad libidum; multiple mixture (MM) fed at 0.2% of live weight (PV); and, concentrate feed (SC) fed at 0.7% of PV. Thirty six weaned calves averaging eight months and 192 kg of initial live weight were utilized. The masses and pasture components, nutritive value and rate of forage growth were evaluated. Animal performance was measured as average daily gain (ADG) and live weight gain (LWG). The supplemental feeding was adjusted after weighing. There was no difference between periods for forage mass and leaf: stem ratio. The highest values for forage green mass, leaf blades mass and stem percentage were observed in the first trial period. The canopy height and the available forage on offer did not differ among treatments. The percentage of dead was higher for the last periods of evaluation. The leaf: stem ratio and the leaf percentage were greater in the second period. There was significant difference (p<0,05) among treatments for the ADG and were 250, 460 and 770 g/day for salt, MM and SC, respectively. The biggest LWG was observed in the treatment SC. contents of PB, DIVMO, NDF and LDA on leaf blades, thatched roofs and dead material dead not differ among treatments. The highest GPV was observed in the SC treatment. The contents of PB, DIVMO, NDF and LDA for leaf blades stem and dead material did not differ among treatments. Independent of the use supplements , it is possible to keep steers gaining weight, during dry season, since the stocking rate is appropriately adjusted

Factores que afectan el rendimiento escolar de los pobres: revisión de investigaciones educacionales, 1980-1995

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Capital social y políticas públicas en Chile: investigaciones recientes: volumen I

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Capital social y políticas públicas en Chile: investigaciones recientes: volumen II

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Aproximación al estado de situación de la oferta y demanda de información de investigaciones sobre drogas en Chile

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Correlações entre características morfogênicas e estruturais em pastos de capim-braquiária

The analysis of both morphogenetic and structural characteristics of pasture allows us to understand the response patterns of the plant to the environment. Thus, this study was conducted to evaluate the associations between the morphogenetic and structural characteristics of Brachiaria decumbens under continuous grazing by cattle. The development of individual tillers in pastures was evaluated under two grazing management strategies during three seasons (winter, spring and summer). Pearson correlations between variables were estimated. The lengths of leaf and stem, number of tillers and leaves per tiller, rates of leaf appearance and elongation of leaf and stem of B. decumbens were positively correlated. There was a negative relationship between appearance and lifespan of leaves (r = -0.89). However, positive correlations between leaf appearance rate and number of tillers (r = 0.64) and between length of stem and leaf senescence rate (r = 0.63) were determined. The B. decumbens modifies its morphogenesis to better adapt to climate and grazing management.

Utilización de informaciones estadísticas en investigaciones demográficas sobre Chile realizadas por CELADE

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Algunos hallazgos de investigaciones de CELADE: utilidad de estos hallazgos para mejorar programas de planificación familiar en América Latina

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Las investigaciones sobre tierras indígenas en Brasil: una evaluación crítica

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