摘要：

Basal medium.?The basal medium used was similar to that previously employed1 and consisted of 0.59k acid-hydrolyzed purified casein, 1^0 glucose, 1^0 sodium acetate ^J^O, and inorganic salts, including 0.2% phosphate; this was supplemented with 100 mg each of L-cystine, ltryptophane, L-hydroxyproline, DL-threonine and DL-serine, 10 mg each of adenine sulfate, guanine hydrochloride, thymine, hypoxanthine, and uracil per liter of medium. The purines and pyrimidines were added because their presence, along with the needed vitamins, results in speedier growth of many lactobacilli. The vitamins used for 1000 ml of medium were

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