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University of Texas, Rio Grande Valley - CLSC 2429 1)Define a differential medium and discuss its purpose

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University of Texas, Rio Grande Valley - CLSC 2429

1)Define a differential medium and discuss its purpose.

2. Define a selective medium and describe its purpose
3. Why is MacConkey agar selective as well as differential?
4. Why is blood agar useful as a primary isolation medium?
5. How can one distinguish E. coli from P. aeruginosa on
   1. Nutrient agar?
      1. Blood afar?
      2. MAC agar?
6. What is the major difference between Modified Thayer-Martin (MTM) medium and chocolate agar? When would you use MTM medium rather than chocolate agar?
7. If you wanted to isolate S. aureus from a pus specimen containing a mixed flora, what medium would you choose to get results most rapidly? Why?
8. What is the value of making gram stain directly from a clinical specimen?
9. Why is aseptic technique important in the laboratory? In the patient care?
10. Why is human blood no longer used in the preparation of culture media?

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