You are growing Bacillus subtilis, an aerobic bacterium that can also carry out fermentation when required, in a bioreactor and notice that the growth rate has slowed and the pH has decreased. You suspect the bacteria are

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The decrease in pH suggests the production of acidic byproducts, which is a characteristic of fermentation. When oxygen is limited, Bacillus subtilis can switch to fermentation, leading to the production of acids that lower the pH.

You Are Growing Bacillus Subtilis, an Aerobic Bacterium That Can