Chemical States of Bacterial Spores: Dry-Heat Resistance

Chemical states of bacterial spores: dry-heat resistance.

Mature bacterial spores can be manipulated by chemical pretreatments between states sensitive and resistant to dry heat. The two chemical forms of the spore differ in dry-heat resistance by about an order of magnitude. Log survivor curves for each chemical state were approximately straight lines. The temperature dependence of dry-heat resistance for each chemical state was similar to that usual...

Mineralization and heat resistance of bacterial spores.

The heat resistances of the fully demineralized H-form spores of Bacillus megaterium ATCC 19213, B. subtilis var. niger, and B. stearothermophilus ATCC 7953 were compared with those of vegetative cells and native spores to assess the components of resistance due to the mineral-free spore state, presumably mainly from dehydration of the spore core, and to mineralization. Mineralization greatly i...

Physical Surface Features and Chemical Density of Dry Bacterial Spores.

Berlin, E. (U.S. Department of Agriculture, Washington, D.C.), H. R. Curran, and M. J. Pallansch. Physical surface features and chemical density of dry bacterial spores. J. Bacteriol. 86:1030-1036. 1963.-Gas-displacement and gas-adsorption techniques were used to determine the chemical density and physical surface properties of the spores of Bacillus subtilis 15U, B. cereus 720, and B. stearoth...

Relation of dipicolinic acid to heat resistance of bacterial spores.

Chemical manipulation of the heat resistance of Clostridium botulinum spores.

The chemical forms of Clostridium botulinum 62A and 213B were prepared, and their heat resistances were determined in several heating media, including some low-acid foods. The heat resistance of C. botulinum spores can be manipulated up and down by changing chemical forms between the resistant calcium form and the sensitive hydrogen form. The resistant chemical form of type B spores has about t...