Abstract
SummaryThe formation of lactic acid by washed cells of Streptococcus lactis is increased by the presence of ascorbic acid or nicotinic acid. The two compounds act differently. Ascorbic acid stimulates mostly (perhaps exclusively) injured or exhausted cells while nicotinic acid affects normal and injured cells equally. The combined action of the two acids is usually, but not always additive, and approximates the effect of peptone. When both nicotinic and ascorbic acid are present, other compounds like cysteine or adenine may increase the rate of fermentation while these compounds alone have no such effect.
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