The Effect of Variation in pH on the Heat Resistance of Cultures ofStreptococcus faecalis

摘要

SummaryThree strains ofStreptococcus faecaliswere exposed to heat (60°) in phosphate and citrate‐phosphate buffer solutions at various levels of pH and their resistance measured by calculation of decimal reduction time. All three strains were more susceptible to heat at low and at high pH than at pH approaching neutrality. In the range pH 6°6–7°0 there were considerable variations in resistance with maximum survival usually at pH 6°8; on both sides of this value, sensitivity was sharply increased. Preliminary experiments at other lethal temperatures gave similar