Abstract
When penicillin, and other inhibitors of peptidoglycan synthesis were added to encysting cultures of Bdellovibrio strain W, the encysting process continued, resulting in the production of cysts which were spherical in shape. Transmission electron micrographs of these spherical bdellocysts revealed the absence of an outer cyst wall. These cysts, devoid of cyst wall, were capable of germination under appropriate condition with the emergence from the prey ghost of highly motile spheroplasts. Withdrawl of the antibiotics after encystment had begun led to the production of spherical cysts that were surrounded by an outer cyst wall.
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