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J Bacteriol. 1975 October; 124(1): 279-284

Development of defined and minimal media for the growth of Bacillus stearothermophilus.

ABSTRACT

Defined media, both solid and liquid, that support good growth of Bacillus stearothermophilus 1503 have been developed. Data are presented which indicate that manganese is required at relatively high concentrations for growth in a defined liquid medium. Phosphate concentrations higher than 5 times 10(-3) M have been shown to inhibit colony formation on solid media. Maximum viable counts of approximately 10(9) colony-forming units per ml were obtained in both the defined and minimal liquid media. Glucose, fructose, sucrose, glycerol, and starch support the growth of this obligate thermophile in the defined media, whereas citrate, alpha-ketoglutarate, succinate, fumarate, malate, acetate, and lactate do not. The described media have been utilized to isolate several amino acid-requiring mutants of B. stearothermophilus.