- International Journal of Systematic and Evolutionary Microbiology
- Volume 42, Issue 1
f Spirochaeta thermophila sp. nov., an Obligately Anaerobic, Polysaccharolytic, Extremely Thermophilic Bacterium
- Authors: Helena Yu Aksenova, Frederick A. Rainey†,*, Peter H. Janssen, George A. Zavarzin, Hugh W. Morgan
- *Corresponding author.
- Int J Syst Evol Microbiol, January 1992 42: 175-177, doi: 10.1099/00207713-42-1-175
- Subject: Original Papers Relating To Systematic Bacteriology
- Published Online:
Growth at temperatures of >60°C and utilization of polysaccharides have not been reported previously in members of the genus Spirochaeta. Two obligately anaerobic, extremely thermophilic (optimum temperature, 65°C) spirochetes were isolated from geographically distant thermal sites. These two isolates have chemoorganotrophic fermentative metabolism and grow on a variety of mono-, di-, and polysaccharides, including cellulose. The differences in pH and NaCl concentration optima between these organisms reflect the prevailing conditions at the sites from which they were isolated. DNA-DNA hybridization showed that the two strains exhibit a level of homology of 87%. On the basis of their morphological characteristics, their high level of homology with each other, and their extremely thermophilic and polysaccharolytic nature, we propose that these organisms should be included in the genus Spirochaeta as a new species, Spirochaeta thermophila; the type strain of this species is strain Z-1203 (= DSM 6578).
Present address: Department of Microbiology, The University of Queensland, Queensland 4072, Australia.
Copyright © 1992 International Union of Microbiological Societies | Published by the Microbiology Society
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