Abstract
abstract – The nongrowing K‐1 streptococci of human origin contained less potassium after incubation at pH 5.2 and 8.4 than at pH 5.8 or 6.8. Net accumulation of potassium occurred in the presence of sucrose, especially at pH 6.8. Penicillin and molybdenum did not modify the potassium accumulation. Fluoride (50 ppm or more) caused a decrease in the potassium content in both the fermenting and nonfermenting organisms at pH 5.8. One hundred ppm reduced the accumulation at higher pH levels also. A lower concentration (20 ppm) lessened the potassium accumulation in fermenting organisms. Ethanol (6%) reduced the accumulation of potassium at pH 5.2, 6.8, and 8.4 and caused a potassium loss in nonfermenting cells at pH 5.8. The cellular total phosphorus content was altered similarly to potassium when studied in a part of series performed but the changes were relatively smaller. The decreases of the cellular potassium and phosphorus content and accumulation were greatest in the presence of both ethanol and fluoride. The “pretreat‐ments” of the cells with both ethanol and fluoride decreased their acid production capability.
Published Version
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