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	Provedor de dados ArchiMer (2) Autor Callac, Nolwenn (1) Donard, Olivier F. X. (1) Escoube, Raphaelle (1) Holmes, Robert Max (1) Pokrovsky, Oleg S. (1) Rouxel, Olivier (1) Schroth, Andrew (1) Mais... Palavra-chave Iron isotope (2) Arctic (1) Colloids (1) Cultures en bioréacteurs (1) Cultures en fioles (1) Cultures in batch (1) Cultures in bioreactors (1) Cycle du fer (1) Cycle du soufre (1) Hydrothermal systems of Guaymas Basin (1) In situ colonization module (1) Interactions procaryotes-biotopes (1) Iron cycle (1) Iron speciation (1) Isotopie du fer (1) Isotopie du soufre (1) Module de colonisation in situ (1) Prokaryote-biotope interactions (1) River (1) Sulfur cycle (1) Mais... Tipo do documento Text (2) Ano 2015 (1) 2013 (1) País France (2) Idioma Francês (1) Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Cycles biogéochimiques du Fer et du Soufre dans les systèmes hydrothermaux en contexte sédimentaire du Bassin de Guaymas : traçages isotopiques et interactions micro-organismes/minéraux ArchiMer Callac, Nolwenn. Active hydrothermal chimney and sediments of the Guaymas Basin (Mexico) host various microbial communities with different metabolisms, including those involved in biogeochemical cycles of sulfur and iron. It is established that, in these dynamic ecosystems, microbial activity depends on the availability of substrates in their environment and that prokaryotes could, in return locally affect the composition of the hydrothermal fluid and mineralogical composition of the chimney or sediment, by mediating the dissolution and / or precipitation of some mineral phases. In order to study these prokaryotes-biotope interactions, and establish links between the structure, the activity and the isotopic signatures of microbial communities with the physico-chemical... Tipo: Text Palavras-chave: Interactions procaryotes-biotopes; Cycle du fer; Cycle du soufre; Thermophiles; Cultures en bioréacteurs; Cultures en fioles; Module de colonisation in situ; Isotopie du fer; Isotopie du soufre; Systèmes hydrothermaux du Bassin de Guaymas; Prokaryote-biotope interactions; Iron cycle; Sulfur cycle; Thermophilic micro-organisms; Cultures in bioreactors; Cultures in batch; In situ colonization module; Iron isotope; Sulfur isotope; Hydrothermal systems of Guaymas Basin. Ano: 2013 URL: https://archimer.ifremer.fr/doc/00498/60953/64356.pdf Iron isotope systematics in Arctic rivers ArchiMer Escoube, Raphaelle; Rouxel, Olivier; Pokrovsky, Oleg S.; Schroth, Andrew; Holmes, Robert Max; Donard, Olivier F. X.. The input of iron to the Arctic Ocean plays a critical role in the productivity of aquatic ecosystems and is potentially impacted by climate change. We examine Fe isotope systematics of dissolved and colloidal Fe from several Arctic and sub-Arctic rivers in northern Eurasia and Alaska. We demonstrate that the Fe isotopic (δ56Fe) composition of large rivers, such as the Ob’ and Lena, has a restricted range of δ56Fe values ca.–0.11 ± 0.13‰, with minimal seasonal variability, in stark contrast to smaller organic-rich rivers with an overall δ56Fe range from–1.7 to + 1.6‰. The preferential enrichment with heavy Fe isotopes observed in low molecular weight colloidal fraction and during the high-flow period is consistent with the role of organic complexation of... Tipo: Text Palavras-chave: Iron isotope; Colloids; River; Weathering; Arctic; Iron speciation. Ano: 2015 URL: https://archimer.ifremer.fr/doc/00273/38402/36865.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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