908 resultados para 2,3 bis(2 methoxy 4 nitro 5 sulfophenyl) 5 ((phenylamino)carbonyl) 2H tetrazolium hydroxide


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Barium in marine terrigenous surface sediments of the European Nordic Seas is analysed to evaluate its potential as palaeoproductivity proxy. Biogenic Ba is calculated from Ba and Al data using a conventional approach. For the determination of appropriate detrital Ba/Al ratios a compilation of Ba and Al analyses in rocks and soils of the catchments surrounding the Nordic Seas is presented. The resulting average detrital Ba/Al ratio of 0.0070 is similar to global crustal average values. In the southern Nordic Seas the high input of basaltic material with a low Ba/Al ratio is evident from high values of magnetic susceptibility and low Al/Ti ratios. Most of the Ba in the marine surface sediments is of terrigenous and not of biogenic origin. Variability in the lithogenic composition has been considered by the application of regionally varying Ba/Al ratios. The biogenic Ba values are comparable with those observed in the central Arctic Ocean, they are lower than in other oceanic regions. Biogenic Ba values are correlated with other productivity proxies and with oceanographic data for a validation of the applicability in paleoceanography. In the Iceland Sea and partly in the marginal sea-ice zone of the Greenland Sea elevated values of biogenic Ba indicate seasonal phytoplankton blooms. In both areas paleoproductivities may be reconstructed based on Ba and Al data of sediment cores.

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Magnetic susceptibility and ice-rafted debris of surface sediments in the Nordic Seas were investigated to reconstruct source areas and recent transport pathways of magnetic minerals. From the distribution of magnetic susceptibility and ice-rafted debris and published data on petrographic tracers for iceberg drift, we reconstructed a counter-clockwise iceberg drift pattern during cooler phases in the Holocene, which is similar to conceptual and numerical models for Weichselian iceberg drift. The release of basaltic debris at Scoresby Sund played a significant role for the magnetic signature of stadial/interstadial events during isotope stage 3 recorded in sediment cores of the Nordic Seas.

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Die Autoren führen in den Themenschwerpunkt des Heftes ein. "Die Beiträge [dieses Heftes] beziehen sich auf die sprachliche Bildung von Kindern im Alter von 3-8 Jahren. Sie befassen sich auf der Grundlage empirischer Untersuchungen mit sprachlichen Fähigkeiten von Kindern in mehrsprachigen Kontexten sowie mit Praktiken der Sprachförderung in verschiedenen Bildungseinrichtungen." (DIPF/Orig.)

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Contiene: - Las actividades empresariales en colombia: Estudio Global Entrepreneurship Monitor - El Concepto de intervención social y sus retos frente a la gestión - Intervención social y responsabilidad: retos para empresas y comunidades - antecedentes de la intervención social contemporánea - La política pública como forma de intervención y de configuración de categorías de sujetos intervenidos: el Concejo Municipal de Cali 1954-2005 - Tercer sector y la intervención social, tensiones, retos y posibilidades - Actividades sobre lo público en la Icesi

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Agenda: 1- Conceitos 2- Sistema de Gestão da Qualidade Laboratorial, Requisitos regulamentares e Referenciais normativos 3- Certificação e Acreditação 4- Avaliações 5- Aplicação ao Laboratório Clínico 6- Requisitos técnicos da ISO 15189

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41 p.