%0 Journal Article %A Houwink, A. L. %T Flaǵella, Gas Vacuoles and Cell-wall Structure in Halobacterium halobium; an Electron Microscope Study %D 1956 %J Microbiology, %V 15 %N 1 %P 146-150 %@ 1465-2080 %R https://doi.org/10.1099/00221287-15-1-146 %I Microbiology Society, %X SUMMARY: A droplet of a suspension of Halobacterium halobium in a concentrated brine when left to dry on a collodion-covered grid yields a useful preparation for electron microscopy. Two strains, one red and one pink, were examined. Both strains have polar tufts of flagella. The cell wall contains a single layer of hexagonally arranged globular particles. Halobacterium halobium has these characteristics in common with Spirillum spp., but unlike the true Spirillum spp. it is rod-shaped. Electron microscopical examination showed that the gas vacuoles observed by Petter (1931, 1932) to be a feature of pink strains of H. halobium actually were smaller but much more numerous than the optical microscope revealed. Stereo-pictures show that these vacuoles did not collapse upon desiccation of the bacteria. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-15-1-146