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Radiation Resistance of Spores of Bacillus subtilis and B. stearothermophilus at Various Water Activities
Author(s) -
Härnulv B. G.,
Snygg B. G.
Publication year - 1973
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.1365-2672.1973.tb04152.x
Subject(s) - bacillus subtilis , spore , glycerol , aqueous solution , endospore , chemistry , anoxic waters , water activity , heat resistance , phase (matter) , food science , microbiology and biotechnology , bacteria , biology , materials science , environmental chemistry , biochemistry , water content , organic chemistry , composite material , genetics , geotechnical engineering , engineering
S ummary . The radiation resistance of spores of Bacillus subtilis and B. stearothermophilus was determined under anoxic conditions in water vapour and in aqueous solutions of glucose and glycerol at various water activities. In water vapour, resistance of both kinds of spores increased slightly with decreasing water activity ( a w ). In glycerol solutions, a phase of rapid increase in resistance with decreasing a w was followed by a slower increase on further reduction of a w . This second phase was almost parallel to the water vapour curve, which, however, showed considerably lower resistance. The initial phase of rapid increase in resistance was also observed in glucose solutions.