Carbohydrate Fermentation 2
The purpose of this test is to determine whether an organism can ferment a specific carbohydrate with production of acid. In this example lactose is used. The indicator is bromthymol blue and turns yellow when pH is low. 1. Uninoculated medium. 2. Positive reaction: Escherichia coli. 3. Negative reaction: Salmonella. The medium is lighter in colour than the uninoculated medium due to turbidity caused by the growth of bacteria.
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