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Some bacteria require specific nutrients to grow - if you have media lacking those nutrients, the bacteria won't grow and that helps you identify the species.

Also, some bacteria produce characteristic patterns in the media, which can help identify the bacterial species. For instance, some types of Staphylococcus bacteria completely break down red blood cells (alpha hemolysis) and other types partially break down red blood cells (beta hemolysis).

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11y ago
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10y ago

differential media contains indicators that visually distinguish between organisms eg; mannitol and phenol red indicator the principle in this media is that the mannitol is fermented to produce an acid which changes the colour of the agar to yellow.

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Q: How can you use differential media to distinguish bacterial species?
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