A Strain of Bacillus circulans Capable of Growing under Highly Alkaline Conditions

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Abstract
An organism capable of growing at pH values up to 11.0 appeared, presumably as a contaminant, in the course of "training" experiments designed to produce alkali resistant strains of Bacillus cereus Frank-land and Frankland; this organism has now been characterized as B. circulans Jordan. Of 26 other strains of B. circulans studied, none grew at pH 10.7. The alkali-resistant B. circulans strain showed little loss of resistance after many transfers on neutral medium. When it grew in alkaline media it lowered the pH value of these media.