يعرض 1 - 8 نتائج من 8 نتيجة بحث عن '"colloidal and particulate"', وقت الاستعلام: 0.39s تنقيح النتائج
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    Academic Journal
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    Academic Journal

    المساهمون: Institute of Bio- and Geosciences Jülich (IBG), Forschungszentrum Jülich GmbH, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Géosciences Rennes (GR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS), Sol Agro et hydrosystème Spatialisation (SAS), AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de la Recherche Agronomique (INRA), Norwegian Institute of Bioeconomy Research (NIBIO), Swedish University of Agricultural Sciences (SLU), The James Hutton Institute, University of Ulster, Helmholtz Zentrum für Umweltforschung = Helmholtz Centre for Environmental Research (UFZ), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven)

    المصدر: ISSN: 2296-7745 ; Frontiers in Marine Science ; https://hal-insu.archives-ouvertes.fr/insu-01861205 ; Frontiers in Marine Science, Frontiers Media, 2018, 5, pp.276. ⟨10.3389/fmars.2018.00276⟩.

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    Academic Journal
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    Report

    المؤلفون: 溫良碩

    مصطلحات موضوعية: 膠體, 有機硫醇物, 微量元素, 元素種類, Colloids, Thiols, Trace Elements, Speciation, Distr ibution, Recent studies indicated that colloidal organic matter has considerable potential for impacting upon many oceanic processes, such as oceanic buffering of global climate change, in biogeochemical conversions and cycling, in trace element scavenging, in latering the sedimentation behaviour of suspended particles, in carbon utilization by bacteria and in ther generation of microbial habitat. Central to understanding the roles of colloidal orgainc mater in oceanic processes are the needs to (1) quantify this fraction accurately (2) characterize the components, and (3) relate well-defined major components to relevant activity. There is increasing evidence for the importance of organic matter complexation of trace elements in natural waters. One of the most important questions in marine and environmental chemistry is the identification of specific functional groups which are responsible for complexing a particular trace metal. The objectives include the determination of, (1) the concentrations and distributions of colloids in different marine waters, (2) the concentrations and distributions of dissolved, colloidal and particulate thiols in different marine waters, (3) complexation of metal ions to specific thiols in natural organic matter, (4) determination of the structure and stability of these biopolymers towards biological, chemical and photochemical degradation. The approach consists of using instrumental methods (e.g, Cross-flow ultrafiltration, ion exchage, HPLC, GF-AAS, ICPMS). The proposed research is relevant to oceanography because thiols have a special role in aquatic organisms as metal sequestering and detoxification agents, thus regulating trace metal concentrations as well as their bioavailability and toxicity. These organic fibrils also have a similar function in the extracellular mileu by forming flocs and biofilms, binding extracellular enzymes in their active forms, scavenging trace metals from the water

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    Electronic Resource