Agar types

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7 Terms

1
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Phenylethyl Alcohol (PEA)

inhibits growth of gram (-) bacteria

2
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Mannitol Salt Agar (MSA)

High salt content inhibits growth of non-halophilic bacteria

Turns from red to yellow when bacteria can ferment mannitol

3
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Eosin-Methylene Blue (EMB)

Inhibits growth of gram (+)

Lactose fermenters turn green/purple iridescent

4
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Blood agar

allows growth of gram (+)

Hemolysis indicates ability to break down RBCs

Beta - fully; alpha - partially; gamma - none

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MacConkey agar (MAC)

Inhibits gram (+) growth

Lactose-fermenting turn red

6
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Simmons citrate

Blue - have citrate permease

7
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Triple-Sugar Iron (TSI)

All yellow - ferments disaccharides

Pink slant, yellow butt - ferments only glucose

Black precipitate - sulfur reduction

Air - air