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SUMMARY: The effect of heat, HgCl2 and cetrimide on decarboxylase systems of some typical lactic acid bacteria and coliform organisms has been investigated. The enzymes appeared to be reversibly inactivated by heat, for the cultures in milk and in broth retained considerable decarboxylase activity after having been heated to 100 for 60 min. Furthermore, decarboxylation continued after sterilization of the cultures with HgCl2, and with cetrimide.
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