• 1 January 1980
    • journal article
    • research article
    • Vol. 22  (2) , 654-660
Abstract
The obligatory halophilic, phototrophic bacterium, strain WS 68, grows under anaerobic conditions in the light in a mineral medium with acetate as C source and 6-20% NaCl or in the same medium semiaerobically in the dark. The cells are vibrio- or spiral-shaped and show a bipolar polytrichous flagellation. The absorption spectrum of membranes, isolated from phototrophically grown cells, shows absorption maxima at 375, 490, 520, 555, 590, 800, 840-845 and 870-875 nm indicating the presence of bacteriochlorophyll a and carotenoids as pigments of the photosynthetic apparatus. The cell surface is covered with a layer of regularly arranged particles (center to center distance approximately 10.5 nm). A murein (peptidoglycan) sacculus was not detected in ultrathin sections, freeze-fracture preparations and cells extracted with hot dodecyl sulfate. The intracytoplasmic membranes lie parallel to the cell envelope. The polypeptide patterns of isolated membranes and of the envelope fraction have been demonstrated. The results are discussed in the light of taxonomy and cell organization.