[Effect of temperature and aeration on Bacillus thuringiensis growth and sporulation]

The growth of Bacillus thuringiensis was studied as a function of temperature and aeration. The vegetative growth, the yield of viable spores and their thermoresistance did not depend, for all practical purposes, on the rate of aeration within the range of 25 to 60 mg O2 per litre per minute. A rise of temperature from 20 to 35 degrees C doubled the titre of spores and increased their thermoresistance. When the temperature of cultivation was increased to 40 degrees C, the process of spore formation was inhibited.