Limitation of Bacterial Growth at Higher Temperatures

Abstract

Attempts to acclimate members of the "subtilis group" to growth at higher temp. resulted in only a small degree of success. Nutrient broth containing peptone, lactose and NaCl in the highest concentrations which supported growth failed to permit growth at higher temp. and was inferior to ordinary meat extract and beef infusion broths in this respect. Certain correlations between the thermolabili-ties of catalase, "paraphenylenediamine oxidase," peroxi-dase and succino-dehydrogenase activities and the temp. marking the maximum temp. of growth of members of the "subtilis group" and of thermophiles were observed.