| Summary: | Interest in the microorganisms of harsh environments has increased for several reasons within past years. One of us (R. E. C.) has made extensive collections of microorganisms from many desert regions over the past several years. The work reported here is limited to bacterial species. The extensive nature of the collection provided an opportunity to examine the general physiological characteristics of bacteria from a harsh environment; the role of antibiosis in the ecology of the group and the generic distribution in divergent desert soils. © 1973 Arizona Academy of Science. The Technical assistance of Bettie Holiday in the routine testing is appreciated. Dr. Manley Mandel kindly provided G-C ratios on several key strains. This paper represents the results of one phase of research carried out by the Arizona State University and the Jet Propulsion, California Institute of Technology, under contract NAS 7-100, sponsored by the National Aeronautics and Space Administration. Logistic support and facilities for the investigations in Antarctica and additional laboratory support at JPL were provided under contract C-585 with the National Science Foundation.
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