Selective and Differential Media •Selective media – Media designed to inhibit the growth of some organisms while encouraging the growth of others •Differential media – Media that contains substances (indicators) that reveal differences between organisms • Media can be both selective and differential.
Selective and Differential Media Selective media – Media designed to inhibit the growth of some organisms while encouraging the growth of others Differential.
Dec 19, 2015
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Selective and Differential Media
• Selective media– Media designed to inhibit the growth of some
organisms while encouraging the growth of others
• Differential media– Media that contains substances (indicators) that
reveal differences between organisms
• Media can be both selective and differential.
Mannitol Salt agar
Both a selective and a differential medium
PEAPhenylethyl Alcohol Agar
A selective media that inhibits the growth of most Gram negative microbes
EMBEosin
Methylene Blue
Both a selective and a differential medium. Dyes inhibit Gram positives
HEA (Hektoen
Enteric Agar)
Both a selective and a differential medium. Bile salts inhibit Gram positives
HE Agar Plates
Hektoen enteric (HE) agar. Salmonella produces greenish colonies with black centers as
shown in the left panel. Enterobacter produces bright orange colonies as shown in the
right panel.
MacConkey’s Agar
Both a selective and a differential medium. Bile salts and crystal violet inhibit Gram positive bacteria
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