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Effect of combined heat and radiation on microbial destructionA series of experiments at several levels of relative humidity and radiation dose rates was carried out using spores of Bacillus subtilis var. niger to evaluate the effect of heat alone, radiation alone, and a combination of heat and radiation. Combined heat and radiation treatment of microorganisms yields a destruction rate greater than the additive rates of the independent agents. The synergistic mechanism shows a proportional dependency on radiation dose rate, an Arrhenius dependence on temperature, and a dependency on relative humidity. Maximum synergism occurs under conditions where heat and radiation individually destroy microorganisms at approximately equal rates. Larger synergistic advantage is possible at low relative humidities rather than at high relative humidities.
Document ID
19770055598
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fisher, D. A.
(Minnesota Univ. Saint Paul, MN, United States)
Pflug, I. J.
(Minnesota, University St. Paul, Minn., United States)
Date Acquired
August 9, 2013
Publication Date
May 1, 1977
Publication Information
Publication: Applied and Environmental Microbiology
Volume: 33
Subject Category
Man/System Technology And Life Support
Accession Number
77A38450
Funding Number(s)
CONTRACT_GRANT: NGL-24-005-160
Distribution Limits
Public
Copyright
Other

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