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Bioaccumulation des métaux chez le mytilidae hydrothermal Bathymodiolus sp. de la ride médio-atlantique ArchiMer
Rousse, N; Boulegue, J; Cosson, Rp; Fiala-medioni, A.
The hydrothermal environment is characterised, among other things, by a high metal concentration, related to the convective sea-water circulation inside the oceanic crust and its interaction with basaltic rocks. The biological communities associated with the hydrothermal system can survive in this toxic environment owing to their ability to regulate their intracellular metal levels by excretion or accumulation of metal ions in non-toxic forms. Various detoxification processes have been previously studied within an hydrothermal organism: immobilisation and precipitation of the metal in lysosomal systems, or binding to specific and soluble ligands such as metallothioneins. The later are heat stable and characterised by a high content of cysteine. The...
Tipo: Text Palavras-chave: Bio-accumulation; Métallothionéines; Lysosomes; Toxicité; Hydrothermal; Bioaccumulation; Metallothioneins; Lysosomes; Toxicity; Hydrothermal.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43662/43238.pdf
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Lucky Strike - A newly discovered hydrothermal site on the Azores platform ArchiMer
Langmuir, C; Charlou, Jean-luc; Colodner, D; Costa, I; Desbruyeres, Daniel; Desonie, D; Emerson, T; Fornari, D; Fouquet, Yves; Humphris, S; Fiala-medioni, A; Saldanha, L; Sours-page, R; Thatcher, M; Tivey, M.k; Van Dover, C; Von Damm, K; Wiese, K; Wilson, C.
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Ano: 1993 URL: http://archimer.ifremer.fr/doc/00070/18096/15644.pdf
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Microanalyse et hydrothermalisme oceanique. Premiers resultats et perspectives dans le domaine de la biologie ArchiMer
Chassard-bouchaud, C; Boumati, P; Escaig, F; Laubier, L; Desbruyeres, D; Fiala-medioni, A; Outrequin, M; Inglebert, R-l; Galle, P.
Specimens of hydrothermal vent organisms, Alvinella caudata and Bathymodiolus thermophilus were collected in 1982 from 13 degree N and 103 degree W, on the East Pacific Rise at a depth of 2600 m. The elemental composition was determined for some of their soft tissues at the structural and ultrastructural levels. Two microanalytical methods were used: secondary ion mass spectrometry and X-ray spectrometry. As examples, external and digestive epithelium and lumen of the digestive tract of Alvinella caudata and the gill and digestive gland of Bathymodiolus thermophilus were investigated. Intracellular localization of the elements, performed by electron microscopy, showed that spherocrystals and lysosomes were the target organelles of metal concentration....
Tipo: Text
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00267/37803/35884.pdf
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Synthese sur les adaptations structurales liees a la nutrition des mollusques bivalves des sources hydrothermales profondes ArchiMer
Fiala-medioni, A.
A survey of the results of different ultrastructural and biochemical studies on bivalve molluscs found in dense populations on the sites of deep hydrothermal vents of the East Pacific Ridge shows that these organisms demonstrate specific ecological and biological features. The most remarkable characteristic of all species is a well-developed gill, constituting the main organ in the nutritive processes, with a majority of its cells colonized by abundant chemoautotrophic bacteria. Structural modifications related to the utilization of particulate material, as well as structural adaptations attributed to bacterial colonization of the gill, are different in the Vesicomyidae Calyptogena magnifica and the Mytilidae Bathymodiolus thermophilus and Bathymodiolus...
Tipo: Text
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00267/37838/35919.pdf
Registros recuperados: 4
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