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A membrane surrounding the protoplasm of rickettsiae has been demonstrated electronmicroscopically by Plotz et al. (1943) and Wissig et al. (1956) in air dried preparations, and by Stoker et al. (1956) and Tousimis (1956) in ultrathin sections. This limiting membrane may be considered to represent the cell wall of these organisms and to correspond to the analogous structure of bacteria. Extensive serological and chemical studies have been carried out on isolated bacterial cell walls (see review by Salton, 1956, and Work, 1957). These investigations point a way to establishing a correlation between structure and function which cannot be achieved in studies on intact, whole organisms. Furthermore, characteristic differences in the chemical composition of cell walls of various bacteria have proved of distinct taxonomic value (Cummins and Harris, 1956). Since rickettsiae are considered an intermediate group of organisms between bacteria and viruses, knowledge of the properties of their cell walls are of particular interest. The present work deals with the preparation and purification of cell walls from Rickettsia mooseri, the agent of murine typhus. A new fractionation procedure has been employed, involving the action of sodium desoxycholate on these organisms.

MORPHOLOGICAL, CHEMICAL, AND SEROLOGICAL STUDIES OF THE CELL WALLS OFRICKETTSIA MOOSERI