Fig. 3A: Starch Hydrolysis by Bacillus subtilis on Starch Agar

The clear zone around the growth of Bacillus subtilis no longer contains starch to react with the iodine. The starch was hydrolized by a diastase produced by the bacterium.

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Microbiology Laboratory Manual by Gary E. Kaiser, PhD, Professor of Microbiology
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Last updated: September, 2017