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J Bacteriol. 1972 December; 112(3): 1040-1042
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Studies on a Thermophilic Bacillus: Its Isolation, Properties, and Temperature Coefficient of Growth

Chancellor College, University of Malawi, Limbe, Malawi

ABSTRACT

A thermophilic bacillus with minimal, optimal, and maximal growth temperatures of 40, 64.5, and 72 C, respectively, was isolated from soil. Biochemical and morphological studies place the isolate in group 1 of the classification of Walker and Wolf. After adaption to nitrate broth, the temperature coefficient for growth was found to be 20,400 cal/mol. When the temperature coefficient for growth of the isolate, psychrophilic bacteria, mesophilic bacteria, and a strain of Bacillus stearothermophilus are compared, there is no correlation with optimal temperature. The form of the Arrhenius equation, as used by some workers, is commented on.