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April 10, 1926


JAMA. 1926;86(15):1145. doi:10.1001/jama.1926.02670410041022

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Influence of Hydrogen Ion Concentration on Anthrax Bacillus  Some important research on the influence of hydrogen ion concentration on the anthrax bacillus has recently been carried on by Dr. S. H. Whitworth at the Institute of Veterinary Pathology of the University of Zurich. The heat resistance of anthrax spores depends not only on the temperature but also on the hydrogen ion concentration of the medium in which they are suspended. Therefore all declarations as to the heat resistance of anthrax spores in liquid mediums or probably in live steam must give not only the time within which the spores die at a certain temperature but also the ph of the medium. If spores are taken from any solution without being washed, and are then dried, their surfaces will hold a certain amount of substances carried from the medium. If these spores are put in flowing steam, these substances will

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