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MSA
Micro lab exam
6
Biology
Undergraduate 4
10/12/2011

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Term
MSA stands for?
Definition
Mannitol salt agar
Term
What kind of media is MSA? Differential or selective?
Definition
Selective medium 
Term
MSA contents
Definition
  • 75% high concentration of NaCl that prevents growth many bacteria except staphyloccoci. This media is mainly used to isolate staphyloccoci. 
  • pH indicator: fermenter of mannitol produces "ACID" that will result to a yellow zone around the bacteria. 
Term
What bacteria will ferment mannitol? and what color will the zone be?
Definition
  • S. aureus and it will produce a yellow zone
  • ferments mannitol
Term
What bacteria would not ferment on mannitol and what color will the colonies be?
Definition
  • S. epidermidis and the colonies will be clear and media will be light pink
Term
What bacterias will not grow on MSA agar?
Definition
E. coli, P. vulgaris, S. enterditis
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