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J Bacteriol. 1970 August; 103(2): 479-481
Copyright © 1970 American Society for Microbiology. All Rights Reserved.

Fatty Acid Distribution in Mesophilic and Thermophilic Strains of the Genus Bacillus

¹ Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49001

ABSTRACT

The fatty acid distribution of three mesophilic and three thermophilic strains of the genus Bacillus was determined by gas chromatography of the fatty acid methyl esters. Fatty acid i-15:0 was the most abundant in both the mesophiles (51%) and the thermophiles (41%). The second most abundant fatty acid was a-15:0 in the mesophiles (22%), and i-17:0 in the thermophiles (27%). The fatty acid pair i-15:0, i-17:0 was the most predominant pair in both the mesophiles (61%) and the thermophiles (66%). The fatty acid pair a-15:0, a-17:0 was the second most predominant pair and was much higher in the mesophiles (30%) than in the thermophiles (15%). The average fatty acid chain length was 15.5 for the mesophiles and 16.0 for the thermophiles. The significance of these results for the lipid theory of thermophily is discussed.

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