S.aureus

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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Chem_mystery
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S.aureus

Post by Chem_mystery » Wed Jul 13, 2005 4:54 pm

hi... i have a question. when S.aureus is grown on Baird-Parker media, why is there 2 zones around the colonies?

thanks
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chemistry_freako
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Post by chemistry_freako » Thu Jul 14, 2005 8:37 am

It's to do with IM report rite?
Find out about the contents of the agar, and what S. aureus contains, and whether the enzymes it contains has any effect on the components of the agar, and u'll get your answer.
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canalon
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Post by canalon » Thu Jul 14, 2005 2:35 pm

Google is your friend :)

I found the answer here :
Typical colonies of S.aureus on [Baird Parker] medium are 1-1.5mm diameter, with an opaque halo surrounded by a 2-5 mm zone of clearing. The halo is a result of lipase activity and the clearing zone is due to proteolytic action.

HTH

Patrick

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