462 resultados para longl-ine


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Digitalisat der Ausg. [S.l.], [circa 1800?]

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Digitalisat der Ausg. [S.l.], [circa 1750]

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Digitalisat der Ausg. Warše, [circa 1920]

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Digitalisat der Ausg. [S.l.], [circa 1800?]

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Zerubavel un Šlimowiṭš

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Fil: Errecalde, Alejandro Martín. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Fil: Errecalde, Alejandro Martín. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Fil: Errecalde, Alejandro Martín. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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The intercellular distribution of the enzymes and metabolites of assimilatory sulfate reduction and glutathione synthesis was analyzed in maize (Zea mays L. cv LG 9) leaves. Mesophyll cells and strands of bundle-sheath cells from second leaves of 11-d-old maize seedlings were obtained by two different mechanical-isolation methods. Cross-contamination of cell preparations was determined using ribulose bisphosphate carboxylase (EC 4.1.1.39) and nitrate reductase (EC 1.6.6.1) as marker enzymes for bundle-sheath and mesophyll cells, respectively. ATP sulfurylase (EC 2.7.7.4) and adenosine 5′-phosphosulfate sulfotransferase activities were detected almost exclusively in the bundle-sheath cells, whereas GSH synthetase (EC 6.3.2.3) and cyst(e)ine, γ-glutamylcysteine, and glutathione were located predominantly in the mesophyll cells. Feeding experiments using [35S]sulfate with intact leaves indicated that cyst(e)ine was the transport metabolite of reduced sulfur from bundle-sheath to mesophyll cells. This result was corroborated by tracer experiments, which showed that isolated bundle-sheath strands fed with [35S]sulfate secreted radioactive cyst(e)ine as the sole thiol into the resuspending medium. The results presented in this paper show that assimilatory sulfate reduction is restricted to the bundle-sheath cells, whereas the formation of glutathione takes place predominantly in the mesophyll cells, with cyst(e)ine functioning as a transport metabolite between the two cell types.

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El Instituto Nacional de Estadística ha decidido elaborar una nueva Estadística de Migraciones utilizando como base la Estadística de Variaciones Residenciales. En este artículo se aportan algunos argumentos que apoyan esta decisión, ante la persistente falta de coherencia entre las fuentes del sistema estadístico español para captar la movilidad. En particular, se profundiza en los problemas de subestimación e inconsistencia interna de la Encuesta de Población Activa para medir la inmigración, a la vista de las diferencias entre las tres series de flujos de inmigración internacional que es posible estimar a partir de la misma.

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"Tirada de 25 ejemplares."