STUDIES OF CHANGES IN pH PRODUCED BY PURE CULTURES OF ORAL MICRO-ORGANISMS

I. EFFECTS OF VARYING THE MICROBIC CELL CONCENTRATION

¹ Walter G. Zoller Memorial Dental Clinic, University of Chicago, Chicago, Ill.

The pH curves produced in a standard buffer solution containing glucose have been determined for several oral micro-organisms at cell concentrations of 1 to 33% by volume. It was found that only at high cell concentrations are the pH changes as rapid as those which occur in the microbic plaques on teeth. Furthermore, in only 1 of the 17 micro-organisms were the pH changes produced at different cell concentrations proportional to the cell concentration.

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