Abstract

1. 1. 3H-serine incorporation into phospholipids isolated from hemolymph, hepatopancreas, gills and muscle was determined for chinese crab Eriocheir sinensis maintained in media of extreme salinities. 2. 2. 3H-serine was mainly incorporated into phospholipids of hepatopancreas and gills. 3. 3. Decarboxylation of PS to PE occurs in these tissues. In addition, successive N-methylation of PE to PC takes place in hepatopancreas. The PS→PE→PC conversion was strongly activated when crabs were transferred from fresh water to sea-water. 4. 4. The roles of PS metabolism and of the N-methylation pathway of PE to PC in osmoregulation by these crabs are discussed.

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