title: Studies on a thermophilic bacillus: its isolation, properties, and temperature coefficient of growth.
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.
mesh_terms: D000332:Aerobiosis; D001407:Bacillus / Q000145:classification / Q000166:cytology / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism; D001431:Bacteriological Techniques; D003470:Culture Media; D006358:Hot Temperature; D012988:Soil Microbiology; D013171:Spores, Bacterial / Q000166:cytology; D013696:Temperature
chemical_list: D003470:Culture Media