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15 Cards in this Set

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  • Back
What is the application of the MRVP Test?
Used to distinguish between members of the family Enterobacteria and differentiate them from other Gram-negative rods.
What is in the MRVP media?
Peptone. Glucose. and Phosphate buffer.
The MR test is designed to detect organisms capable of performing a _____________.
Mixed acid fermentation.
Mixed acid fermentation?
Overcomes the phosphate buffer in the medium and lowers the pH.
What is the interpretation for a red result of the MR test?
Mixed acid fermentation.
What is the interpretation for no color change in the MR Test?
No mixed acid fermentation.
What is the interpretation for red in the Voges-Proskauer Test?
2
What is the interpretation for no color change in the Voges-Proskauer Test?
N0 2(
MR test is designed to detect what?
To detect organisms capable of performing a mixed acid fermentation which overcomes the phosphate buffer in the medium and lowers the pH.
VP is designed for organisms___________.
That are able to ferment glucose
Why does a positive sample turn red?
Methyl red is red at pH 4.4 and yellow at pH 6.2. Red indicates a positive.
What is the interpretation of orange broth?
negative or inconclusive.
What is the interpretation for yellow broth?
Negative. (no mixed acid fermentation)
What is the purpose for peptone and glucose in the media?
Respectively they provide protein and fermentable carbohydrate.
What is the purpose for potassium phosphate in the media?
A buffer that resists pH changes in the medium.