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Abstract
By using high concentrations of vitamins in biotin basal synthetic mineral medium,Candida albicans was shown to possess a partial dependency forp-aminobenzoic acid, nicotinic acid and inositol. Sodium gantrisin [N1-3,4-dimethyl-5-isoxazolyl sulfanilamide)] was growth inhibitory in the absence ofp-aminobenzoic acid and its effect was reversed byp-aminobenzoic acid. Similarly, pyridine-3-sulfonic acid was growth inhibitory to the organism in the absence of nicotinic acid and its effect was reversed by nicotinic acid. Additions of biotins, thiamine, vitamin B12, nicotinic acid,p-amino-benzoic acid and inositol to basal synthetic medium showed clear-cut growth stimulation for each vitamin. Parallel omission type experiments on the other hand, demonstrated a masking effect of one vitamin on another. Ascorbic acid, riboflavin, calcium pantothenate choline, folic acid and thioctic acid were without effect. A new procedure for the determination of microbial vitamin requirements was outlined.
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