By producing acid from the fermentation of lactose present
in milk a bacterium may also cause the milk to curdle or clot in the bottom
of the tube. Litmus may also act as an electron acceptor thus becoming
reduced by bacterial metabolism. This reaction is observed as a white
color in the medium.
The photo at the right illustrates clot formation and redution of
litmus.
A. Represents a tube that produced a curd and reduced litmus.
B. Represents an uninoculated control.
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