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Resistance of wild-type spores and α− β− spores of various strains to UV radiation (A), nitrous acid (B), and moist heat (C). Spores of various strains were prepared and purified and their survival after various treatments was measured as described in the text. The variability in survival values in experiments was ±20%. Symbols: •, PS533 (wild type); ○, PS578 (α− β−); ▵, PS1450 (α− β− SspC); and ▴, PS4049 (α− β− Ssp2).
