Etude des mécanismes de transport et de détoxication des métaux lourds chez la moule d'eau douce Dreissena polymorpha : rôle des hémocytes et des organes du système excréteur (histologie, ultrastructure, microanalyse)

Abstract : Bioindicator capacity of bivalves molluscs for metal is now well know and use in biomonitoring studies. Understanding of this capacity needed a more fundamental study of metal uptake, transport and excretion pathways. Anatomical, cytological and microanalytical studies of hemocytes, pericardial gland and kidney has shown granulocyte rule in transport and detoxication functions of pericardial gland and kidney. Lysosomal system plays an important function. Metal nature changes its distribution in organs. Lead is accumulated with P, S, Ca in concretion in epithelial cells of kidney distal limb. Microanalysis was performed in this case. Possible adaptation of metallic micropolluants presence was research by hemocytes counts, enzymatic activity and phagocytosis capacities evaluation. Hemocytes number and acid phosphatases activity seem to increase but no significant modifications of phagocytosis capacities was observed. Cytological and biochemical responses of hemocytes in presence of metal can be propose of early test (7 days) of metal contamination effects in aquatics systems ; bioaccumulation levels was evaluated by transplant methods after 3 weeks
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Laure Giamberini. Etude des mécanismes de transport et de détoxication des métaux lourds chez la moule d'eau douce Dreissena polymorpha : rôle des hémocytes et des organes du système excréteur (histologie, ultrastructure, microanalyse). Biologie animale. Université Paul Verlaine - Metz, 1993. Français. ⟨NNT : 1993METZ021S⟩. ⟨tel-01775467⟩

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