SUMMARY: Phage-like objects obtained from bacteriocinogenic strains of and by the differential centrifugation of culture fluids were examined in the electron microscope. Particles with small heads and contractile tails were found associated with strains of . The three strains all produced numerous headless contractile tails in broth cultures together with a very few phage-like objects with flexible non-contractile tails. The headless tails possessed cores which appeared both solid and hollow in the electron microscope, indicating the presence of some unidentified substance, perhaps nucleic acid. The only type of particle found associated with was a large bacteriophage with a complex contractile tail. The structure of these particles is described and discussed, and it is concluded that some of them are the bactericidal principles of spontaneously released bacteriocins.


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