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SEM of B. thuringiensis spores treated with different sporicidal chemicals for 30 min, imaged at 50,000 magnification. The loose exosporium surrounding the spore (white arrows) can be seen for spores in (A) purified and deionized water, (B) chlorine dioxide, and (D) peracetic acid. No exosporium in spores treated with (C) sodium hypochlorite is seen. A partially degraded spore is also seen in the image of (D) a peracetic acid-treated spore (yellow arrow). Scale bars are 1 μm.
