Abstract
Summary
B. coli produces, when grown in small batches of nutrient broth, a relatively thermostable substance which inhibits or retards fermentation of dextrose, galactose, and dextrin by C. diph-theriae. The diphtheria bacilli seem to absorb this substance and also to destroy it, and there is no permanent effect of this substance upon the diphtheria bacilli. The action is not dependent upon exhaustion of nutrient substances or alteration in the pH of the media.
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