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Studies on the Minimum Reproducible Unit of Staphylococcal L‐Forms

The minimum size of a reproducible unit of staphylococcal L‐forms was determined by filtration and electron microscopic methods. Ultrathin sections of an induced strain of Staphylococcal L‐forms (STA‐EMT‐1) in liquid medium revealed several types of structures, all of which were bound by a single membrane and most of which possessed ribosome‐like granules. Many of the small granules were less than 0.3 μm and were attached to the membrane of the large bodies. Using a serial filtration method, it was observed that viable L‐forms were still detected in 0.22 μm filtrate, but the viable cell count of L‐forms decreased in number with the decrease in pore size of membrane filters. A fractionation technique, using L‐forms filtered through a membrane filter with a 0.45 μm pore size, revealed that there were three classes of small bodies but only the first class with ribosome‐like granules over approximately 0.2 μm in diameter seems to be able to reproduce.