Abstract
Summary
Nicotinic acid and nicotinamide do not always produce equivalent growth-promoting effects upon microörganisms. A series of microörganisms is presented showing a ratio of activity of amide to acid varying from one-tenth to infinity. The last case is represented by certain organisms of the Pasteurella group whose growth and respiration is promoted by nicotinamide, but not by nicotinic acid. A further summary is presented of synthetic abilities of different microörganisms with respect to the entire enzyme-coenzyme complex.
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