992 resultados para Ni^2
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[Joseph Maarssen]
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[Benjamin Aaron Ben-Abraham Slonik]
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[Benjamin Aaron Ben-Abraham Slonik]
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Tzvi Hirkan
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kol zeh ihel e-asaf ... Shelomoh Zalman Londn
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[Benjamin Aaron Ben-Abraham Slonik]
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Digitalisat der Ausg. Wilna, 1857
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[Isaak Ben-Issachar Br Tsoref]
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Digitalisat der Ausg. Zolkiew, 1849
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Digitalisat der Ausg. Amrdm, [1674/75]
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[Zebi Hirsch Ben-Jerachmiel Chotsch]
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Drought strongly influences root activities in crop plants and weeds. This paper is focused on the performance of the heavy metal accumulator Solanum nigrum, a plant which might be helpful for phytoremediation. The water potential in a split root system was decreased by the addition of polyethylene glycol (PEG 6000). Rubidium, strontium and radionuclides of heavy metals were used as markers to investigate the uptake into roots, the release to the shoot via the xylem, and finally the basipetal transport via the phloem to unlabeled roots. The uptake into the roots (total contents in the plant) was for most makers more severely decreased than the transport to the shoot or the export from the shoot to the unlabeled roots via the phloem. Regardless of the water potential in the labeling solution, 63Ni and 65Zn were selectively redistributed within the plant. From autoradiographs, it became evident that 65Zn accumulated in root tips, in the apical shoot meristem and in axillary buds, while 63Ni accumulated in young expanded leaves and roots but not in the meristems. Since both radionuclides are mobile in the phloem and are, therefore, well redistributed within the plant, the unequal transfer to shoot and root apical meristems is most likely caused by differences in the cell-to-cell transport in differentiation zones without functional phloem (immature sieve tubes).
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ha-kol bi-khtav alav ... Menasheh ben Yirael
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The results of the analysis of samples of the Northern Dvina River's suspended particulate matter obtained by the sedimentation method from large water volumes in the periods of the spring high water and summer low water are presented. By the method of sequential leaching using different reagents, four fractions have been separated: the F1 is the sorbed complex and carbonates, the F2 is the amorphous hydroxides of Fe and Mn, the F3 is the form connected with the organic matter, and the F4 is the residual or silicate-detrital (inert) form. The data have shown that all ten elements determined were grouped with respect to the ratio of the distinguished forms: F4 is the predominant form for Al and Fe (73-88% of all the forms; however, the summer sample contains only 38% of this form of iron, and F2 is the predominant form for this period with 46.6%). As to Mn, the F1, F2, and F4 are nearly equally distributed in the spring high water samples, and only the F3 form is less important (5.4%). In the summer sample, the manganese sorbed complex is predominant (53.5%); for Cu, Ni, Cr, and Co, the inert F4 form is predominant (60-70%) in the sample of the spring suspended matter. The summer low water suspended matter has a lower F4 contribution (25-45%); for Zn, Pb, and Cd, the equal distribution of the forms in the spring samples is typical, while the summer suspended matter differs by the F2 form's predominance (53-61% for Zn and Pb). The main conclusion from the acquired data is that the geochemical mobility of all the studied elements, except for cadmium, in the summer low water suspended matter is higher than in the spring suspended matter. The more intensive biogeochemical processes in August, the high level of organic matter, and the higher contribution of phytoplankton lead to the intensification of the metals' geochemical activity in the Northern Dvina suspended matter in the end of the summer compared to the spring high water period when the physical processes are predominant over the biogeochemical ones due to the high speeds of the freshened waters flow.
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El proyecto PODECI se plante como una propuesta de investigacin bsica y aplicada encaminada a describir, analizar, acompaar y comparar crticamente experiencias concretas de desarrollo local en distintos municipios de la Provincia de Misiones. Desde un comienzo se opt por la participacin directa del equipo tcnico profesional en los espacios multiactorales constituidos en cada mbito local a fin de promover la participacin de las autoridades, la poblacin y las organizaciones locales en el cambio y la transformacin econmica, poltica, social y cultural. El Proyecto se ha sustentado en una perspectiva terico-metodolgica que asume que el desarrollo local participativo posibilitar la configuracin de estrategias ciudadanas fundadas en el compromiso social. Ello supone una va pertinente para generar en las poblaciones locales prcticas democrticas innovadoras, empoderar la sociedad civil y proponer proyectos, social y polticamente sustentados. Desde esta perspectiva se cuestiona la validez y la viabilidad de proyectos dirigidos de desarrollo (top-down), que no promueven la participacin efectiva y eficaz de la mayora de los sectores que componen una comunidad; ni alientan la produccin, consolidacin e institucionalizacin de prcticas organizativas democrticas y consensuadas. En suma: difcilmente podr avanzarse en el camino del desarrollo, sin fortalecer significativamente los dispositivos de ciudadanizacin. En tanto investigacin aplicada, el Proyecto PODECI se encamin a describir, analizar y comparar experiencias concretas de desarrollo, mediante la participacin directa del equipo tcnico en los espacios multiactorales constituidos a nivel local para promover el cambio y la transformacin econmica, poltica, social y cultural. La esencia del planteamiento asumido desde el Proyecto PODECI ha sido que toda estrategia de desarrollo basada en la participacin requiere el compromiso pleno con la poblacin, en la medida en que: 1. las relaciones deben ser directas y estar orientadas a la demanda, 2. las decisiones en materia de polticas pblicas deben adoptarse en un contexto participativo y no depender de la simple voluntad o inters de los funcionarios de turno y 3. la propia accin gubernamental deber activar espacios pblicos multiactorales de concertacin, negociacin y gestin asociada. Se entiende de este modo, que la participacin de los grupos y actores de los sectores ms vulnerables de la sociedad en estos espacios implica en si mismo un avance en los procesos de empoderamiento y democratizacin.
