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Cards In This Set
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What does the Litmus milk broth contain as the pH indicator?
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PH indicator is Litmus
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What kind of milk is used for the Litmus test?
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Skim milk
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What kind of medium is Litmus milk?
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Complex medium
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What is a role for doing the Litmus milk test?
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To identify a wide range of bacteria
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What are the 2 main nutrients that can be metabolized by bacteria?
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Sugar (lactose) and protein (casein)
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Name 2 things the indicator Litmus can show a range of reactions of?
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Changes in pH and changes in oxidation-reduction status
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A pH below 4.5, what color does the Litmus turn?
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Pink
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A pH above 8.3, what color does the Litmus turn?
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Blue
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A pH value between 4.5 and 8.3, what color does the Litmus turn?
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Purple
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If the bacteria ferments lactose, what is produced?
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Acid
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What color does the Litmus turn if the organim ferments lactose and produces acid?
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Pink
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What things does acid production cause the milk proteins to do?
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It may cause them to coagulate or precipitate, forming an acid clot
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How will the medium appear if acid production occurs?
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They will appear pink with white on the bottom or white with a small amount of pink at the top of the tube
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What will the formation of gas during fermentation produce?
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Formation of gas will produce visible rips or channels in the clot
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What is the formation of gas that produces visible rips or channels in the clot called?
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Stormy fermentation
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