selective and differential media selective media – media designed to inhibit the growth of some...
Post on 19-Dec-2015
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![Page 1: Selective and Differential Media Selective media – Media designed to inhibit the growth of some organisms while encouraging the growth of others Differential](https://reader030.vdocuments.mx/reader030/viewer/2022032800/56649d395503460f94a136bc/html5/thumbnails/1.jpg)
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.
![Page 2: Selective and Differential Media Selective media – Media designed to inhibit the growth of some organisms while encouraging the growth of others Differential](https://reader030.vdocuments.mx/reader030/viewer/2022032800/56649d395503460f94a136bc/html5/thumbnails/2.jpg)
Mannitol Salt agar
Both a selective and a differential medium
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PEAPhenylethyl Alcohol Agar
A selective media that inhibits the growth of most Gram negative microbes
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EMBEosin
Methylene Blue
Both a selective and a differential medium. Dyes inhibit Gram positives
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HEA (Hektoen
Enteric Agar)
Both a selective and a differential medium. Bile salts inhibit Gram positives
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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.
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MacConkey’s Agar
Both a selective and a differential medium. Bile salts and crystal violet inhibit Gram positive bacteria