Electron Microscopy of Ultrathin Sections of Sporosarcina ureae

Abstract

Mazanec , K. (J. E. Purkyně University, Brno, Czechoslovakia), M. Kocur, and T. Martinec . Electron microscopy of ultrathin sections of Sporosarcina ureae . J. Bacteriol. 90: 808–816. 1965.—Ultrathin sections of Sporosarcina ureae cells were studied by means of electron microscopy. The cell wall consists of several layers and is 340 A thick. The cytoplasm is of globular structure and includes ribosomelike structures, occasional mesosomes, and inclusions not precisely identifiable. The nuclear area has various shapes and is formed by filaments 10 to 20 A thick which proceed in various directions. Cell division occurs similarly to that of sarcinate. Both synchronic and asynchronic cell division was observed. The spores of S. ureae consist of an outer coat having several layers, a cortex, a spore wall, and cytoplasm. The results of the present investigation substantiate our previous suggestion that S. ureae should be transferred from the family Micrococcaceae to the family Bacillaceae.