Lab Exercise 17:

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Lab Exercise 17
Biochemical Differentiation of some Medically
Important Gram-negative Bacilli
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MacConkey Agar
Left Shigella - result Right
Escherichia result
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Carbohydrate Fermentation Tests
Glucose w/ Durham Fermentation Tube
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Carbohydrate Fermentation Tests
Sucrose Fermentation
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Triple Sugar Iron
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Indole Test
IMViC Series
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Methyl Red Test
IMViC Series
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Voges-Proskauer Test
IMViC Series
Leave uncapped for 15-20 minutes..
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Citrate Utilization Test
IMViC Series
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Urease Test
Negative result (acidic)
Positive result (alkaline)
Uninoculated urea agar
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Motility Test
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A
B

• Answers
• A 3. B
• 2. A 4. B

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What is the name of the lab procedure
demonstrated here?
Answer Stabbing the butt!
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