[Ultrastructure of L forms. IV. L forms of nonagglutinating vibrios].

A study was made of the ultrastructure of stable L-forms of Nag vibrios aged 24 hours. Cells of all types of the L-forms had cytoplasmic membranes, and a three-layered structure, which was found not everywhere. Externally of the cytoplasmic membrane, in some areas of the individual cells there were revealed a plastic layer of cell wall and a basal membrane. However, in difference to bacterial forms of the vibryos, rigidity of the cell wall was disturbed, and the links between the cell wall and the cytoplasmic membrane were indetectable. There were regularly revealed lamellar of myelin-like membranous structures in the cytoplasm, which did not occur in bacterial forms, and also lamellar mesosomes. The latter were found in the sites of cell division. Viability of small bodies as the minimal reproductive forms of the L-cultures is confirmed by the presence in them of a nucleoid and of the binary division.