??Qu?? se ha hecho sobre las TIC en educaci??n superior y sobre la relaci??n j??venes y TIC? : revisi??n a investigaciones realizadas en Am??rica, Europa y Asia

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La formaci??n en alternancia en la universidad y en los ciclos formativos : aportaciones desde dos investigaciones realizadas en Galicia

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Impacto de la formaci??n del profesorado universitario : aspectos metodol??gicos y propuesta para futuras investigaciones

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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.

Regulação da mobilização de lipídios e proteinas por hormônios, fontes de carbono e nitrogênio durante o crescimento pos-germinativo em girassol

The mobilization of food reserves in storage tissues and allocation of their hydrolysis products in the growing axis are critical processes for the establishment of seedlings after germination. Therefore, it is crucial for mobilization of reserves to be synchronized with the growing axis, so that photosynthetic activity can be started before depletion of reserves. For this, integrative approaches involving different reserves, different hydrolysis products and interaction between storage and growing axis tissues, either through hormones or metabolites with signaling role, can contribute greatly to the elucidation of the regulation mechanisms for reserve mobilization. In this study, was hypothesized that hormones and metabolites have different actions on reserve mobilization, and there must be a crossed effect of sugars on the mobilization of proteins and amino acids on lipids and starch mobilization in sunflower seedlings. This study was conducted with seeds of sunflower (Helianthus annuus L.) hybrid Helio 253 using in vitro culture system. Seeds were germinated on Germitest® paper and grown on agar-water 4 g/L without addition of nutrients during 9 days after imbibition (DAI) for growth curve. To verify the effect of metabolites and hormones, seedlings were transferred in the 2nd DAI to agar-water 4 g/L supplemented with increasing concentrations of sucrose or L-glutamine, abscisic acid, gibberellic acid or indolebutyric acid. The results of this study confirm that the mobilization of lipids and storage proteins occurs in a coordinated manner during post-germination growth in sunflower, corroborating the hypothesis that the application of external carbon (sucrose) and nitrogen (L-glutamine) sources can delay the mobilization of these reserves in a crossed way. Moreover, considering the changes in the patterns of reserve mobilization and partition of their products in seedlings treated with different growth regulators, it is evident that the effects of metabolites and hormones must involve, at least in part, distinct mechanisms of action

Avaliação das Sub-Frações dos Carboidratos e das Proteinas, Usando as Metodologias do Cncps e In situ com Bovinos da Raça Nelore. 1. Silagem de Milho

To validate the use of the Cornell Net Carbohydrate and Protein System (CNCPS) under Brazilian conditions, the chemical composition, the potential and the effective degradabilities of the carbohydrate and protein subfractions, and the solid phase passage rate were determined for corn silage in diets with forage:concentrate ratios of 80:20 (DI) and 60:40 (D2) using Nellore cattle. The chromium mordant technique was used to determine the particulate passage rate of solids. For diet 2, there was a reduction in the potentially degradable dry matter (DM), and however not significant, a reduction in the degradation rates of neutral detergent Fiber (NDF, 49%) and neutral detergent insoluble nitrogen (NDIN, 32%), and an increase in the degradation rare of starch (ST, 25%). The use of lag time increased the effective DM degradation (EDDM) of corn silage in both diets (23% and 53% for D1 and D2, respectively). The concentrate ratios did not influence the particulate passage rate of the diets. The higher values related ro the availability of the protein subfractions may indicate a underestimation by CNCPS, Rnd(or) could be attributed to the Zebu animals used in this study.

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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