Abstract

Previous studies have shown that bacterioplankton are retained by the mussel Mytilus edulis (L.), and that lysozyme-like enzymes are associated with the crystalline style of the mussels. This study has demonstrated the presence of a lytic agent which is produced by bacteria associated with the crystalline style. The production of the agent is inhibited by chloramphenicol, and anaerobic growth conditions. The agent is heat-sensitive and nonfilterable. Attempts at the isolation of the agent in a cell-free extract have been unsuccessful. The presence of bacteria-like cells in the outer laminae of the crystalline style, coupled with the nonfilterable nature of the lytic agent, make it seem possible that these bacteria are responsible for lysis of gram-negative bacteria which are taken in with the food supply.

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