Morphology and Round Body Formation in Vibrio marinus

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Abstract
The morphology of Vibrio marinus MP-1 was studied by phase and electron microscopy. The ultrastructure of the vibrio form of V. marinus was found to be typically gram-negative with a trilaminar plasma membrane and cell wall. The coccoid or round bodies noted in otherwise pure cultures of V. marinus were frequently found in early and late stationary phase of growth. The round bodies in ultrathin section were found to contain at least one, and often three or four, cell units. Three types of round bodies were observed in ultrathin section, each differing in size and behavior: “spherules,” “spheres” or the “round body,” and “giant cells” or “macrospheres.” The round bodies appeared to be associated with, or to result from, the constrictive cell division of V. marinus .

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