Term
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Definition
Triple sugar iron which includes 3 sugars: Glucose, lactose and sucrose. The concentrations of lactose and sucrose are 10x higher than that of glucose.
Starts out red and turns red when acidic |
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Term
| What do Enterobacteriaceae use first in TSI? |
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Definition
Enterobacteriaceae will use glucose first and then either die or use sucrose and lactose.
If it can't use the sugars it will break down peptose under aerobic conditions and it will revert back to neutral pH |
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Term
| What does black precipitate in the butt of TSI mean? |
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Definition
| The organism has used the iron |
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Term
| How do you record the results of a TSI test? |
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Definition
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Term
| Yellow/Yellow (Acid/Acid) |
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Definition
Positive for lactose/and or sucrose. Positive for glucose in the butt.
H2S: Negative |
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Term
| Red/Yellow (Alkaline/Acid) |
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Definition
Positive for glucose lactose.
Negative for lactose and sucrose
H2S: Negative |
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Term
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Definition
Lactose and or sucrose positive
Glucose: Positie
H2S: Positive |
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Term
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Definition
Lactose and sucrose: Negative
Glucose: Negative
H2S: Negative
(Indicates the the organism is not a member of the Enterobacteriaceae |
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