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Thermal Injury and Recovery of Selected Microorganisms

Department of Food Science, University of Illinois, Urbana 61801

ABSTRACT

In 1943 a past president of our society, Gene Nelson, observed that bacteria exposed to sublethal heating require more restrictive conditions for growth than unheated bacteria (32). During the next two decades a number of such observations were made. Some of these studies suggested the possibility of recovery from injury (2, 10, 22, 27), but a clearcut concept of recoverable injury had not been formulated. The state of the knowledge in 1963 was recorded in an excellent symposium on survival of bacteria printed in the December issue of J. Appl. Bacteriol. This same year Michael Stiles won the American Dairy Science Association student paper competition by reporting the beat injury and recovery of Staphylococcus aureus. He suggested a new approach to the problem of cell injury and recovery by monitoring recovery in the presence of inhibitors to determine the nature of the injury lesion (42). Using this approach, a fellow student, John Iandolo, made the significant discovery that recovery was inhibited by the RNA synthesis inhibitor, Actinomycin D (26).