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  • Title: Enzymatic activities in European flat oyster, Ostrea edulis, and pacific oyster, Crassostrea gigas, hemolymph.
    Author: Xue Q, Renault T.
    Journal: J Invertebr Pathol; 2000 Oct; 76(3):155-63. PubMed ID: 11023742.
    Abstract:
    Enzymatic activities in the hemolymph of healthy and Bonamia-infected Ostrea edulis and Crassostrea gigas were studied with a commercial kit for the detection of 19 enzymes: 15 and 16 enzymes, respectively, were detected in the hemolymph of O. edulis and C. gigas and 10 of them showed relatively high activity levels. Most of them existed in both the cell-free fraction of the hemolymph and in the hemocytes. The cell-free hemolymph fraction of Bonamia ostreae-infected European flat oysters showed an elevated enzymatic activity level compared with that of healthy individuals. C. gigas hemocytes possessed higher enzymatic activity levels than O. edulis hemocytes. Differences in enzymatic activities existed in granulocytes and hyalinocytes in both oyster species. The enzyme release from oyster hemocytes seemed to be selective. The infection by B. ostreae induced enzymatic activity variations in European flat oysters. Higher enzyme levels within hemocytes may contribute partly to the natural resistance of C. gigas to the infection by B. ostreae.
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