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Effect of Sodium Chloride on the Heat and Radiation Resistance and on the Recovery of Heated or Irradiated Spores of the Genus Bacillus
Author(s) -
Briggs A.,
Yazdany S.
Publication year - 1970
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1970.tb02243.x
Subject(s) - spore , bacillus subtilis , bacillus pumilus , irradiation , sodium , endospore , radiation resistance , food science , heat resistance , chemistry , bacillales , microbiology and biotechnology , biology , bacteria , materials science , organic chemistry , genetics , physics , nuclear physics , composite material
Summary. Increasing concentrations (2, 4 and 8% w/v) of NaCl in the heating medium reduced the heat resistance of spores of Bacillus stearothermophilus but had no effect on the heat or radiation resistances of B. pumilus, B. subtilis and B. subtilis var. niger or on the radiation resistance of B. stearothermophilus. Increasing heat damage rendered all the spores increasingly sensitive to NaCl in the recovery medium. The presence of NaCl during heating reduced the subsequent NaCl sensitivity of B. pumilus, B. subtilis and B. subtilis var. niger but increased that of B. stearothermophilus. Increasing doses of γ radiation rendered the spores of B. stearothermophilus increasingly sensitive to NaCl in the recovery medium. The effect was less pronounced with B. pumilus , whilst B. subtilis and B. subtilis var. niger showed little change in their post‐irradiation sensitivity to NaCl. The presence of NaCl during γ irradiation had no effect on the subsequent pattern of postirradiation NaCl sensitivity.