Abstract
It is well known that biotin has a marked effect on L-glutamic acid fermentation. The authors have intended to find strains which are independent of the amounts of biotin in the culture medium. As a result, oleic acid-requiring mutants were obtained from a strain of Brevibacterium thiogenitalis which is an auxotroph for biotin. The growth of the mutant was remarkably stimulated by Tween 20, 40, 60, Ca ions and a small amount of corn steep liquor. And also, the mutant was found to have lost its requirement for biotin and showed growth response only to oleic acid or unsaturated fatty acids.
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