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11 Cards in this Set
- Front
- Back
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Macconkey agar |
-selective and differential medium -lactose, bile salts, neutral red, Crystal violet -isolate and differentiate enterobacteriaceae |
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Gram positive bacteria |
-bile salts and Crystal violet inhibit growth |
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Neutral red dye |
- is a pH indicator that is colorless above pH of 6.8 - red at pH less than 6.8 |
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Dye turns red |
-acid accumulating from lactose fermentation -nonfermentators retain their color -probable coliform |
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Colorless growth |
-organism does not ferment lactose - no reaction - noncoliform |
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Good growth (g) |
-organism is not inhibited by Crystal violet or bile -gram neg. |
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Poor growth or no growth (p) |
- organism is inhibited by Crystal violet and or bile -gram positive |
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MacConkey Agar and emb agar |
Selective for gram negative organisms and both contain indicators to differentiation lactose fermentation and non. |
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Emb is commonly used |
To test for fecal contamination Presences of coloiform |
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The top and right lactose fermentation because pink The bottom ones non |
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The top and right are gram negative lactose fermentation. Difference in color is due to the amount of acid produced
The bottom and left are gram positive inhibited by eosin y and methylene blue |
