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[Structural changes in spores under high temperature exposure].

The electron microscopy of ultrathin sections of B. cereus spores showed that no lysis and destructive changes occurred in the main structural components of the spores when heated to 99 degrees C (in distilled water). By the time 99% of the population were destroyed, the spores seemed to preserve the exosporium of the sporoderm, the cortex and the sporoblast intact. Even autoclaving at 120 degrees C for 15 min brought about no visible changes in the ultrastructure of the spores, though it killed the whole spore population.