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J Bacteriol. 1972 January; 109(1): 443-446
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Effect of Temperature on the Fatty Acid Composition of the Extreme Thermophiles, Bacillus caldolyticus and Bacillus caldotenax

Department of Exobiology, Faculty of Science, University of Nijmegen, Nijmegen, The Netherlands

ABSTRACT

Gas chromatographic analysis of extracts from Bacillus caldolyticus and Bacillus caldotenax grown at 60, 70, or 80 C showed that both contain branched-chain fatty acids as major constituents at all temperatures tested. With increasing temperature, a decrease of i-C15 and an increase of i-C17 fatty acids were observed in both strains, as well as a decrease of i-C16 fatty acids corresponding to an increase of n-C16 fatty acids. The most obvious difference was that the shifts observed with B. caldolyticus occurred mainly upon raising the temperature to 10 C above, and in B. caldotenax upon lowering the temperature to 20 C below, the optimal growth temperature.

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