The Nutritional Requirements of Lactic Streptococci Isolated from Starter Cultures. II. A Stimulatory Factor Required for Rapid Growth of Some Strains in Reconstituted Nonfat Milk Solids

Numerous experiments have been conducted showing that milk supplemented with yeast extract, peptones, plant juices, hydrolyzed milk, peptic casein digest, malt beer wort, extracts of cells of lactic streptococci, sucrose, glucose, and maltose stimulate growth of the lactic streptococci. This suggests that milk may be deficient in certain nutrients required for the optimum growth of some strains comprising lactic starter cultures.