Heat resistance of spores ofClostridium welchii

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...

Apparatus for the determination of heat resistance of spores.

Apparatus for the rapid transfer of capillary tubes from a hot to a cold bath, by means of two pneumatic jacks, is described.

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...

Relation of dipicolinic acid to heat resistance of bacterial spores.

Heat shock affects permeability and resistance of Bacillus stearothermophilus spores.

Heat shock of dormant spores of Bacillus stearothermophilus ATCC 7953 at 100 or 80 degrees C for short times, the so-called activation or breaking of dormancy, was investigated by separating the resulting spores by buoyant density centrifugation into a band at 1.240 g/ml that was distinct from another band at 1.340 g/ml, the same density as the original spores. The proportion of spores at 1.240...