Differential_and_selective_media

Differential_and_selective_media - Microbiology Laboratory...

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Microbiology Laboratory 4
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Selective Media Selective media : Selective media suppresses the growth of unwanted organisms and encourage the growth of desired microbes. Most selective medias select for the growth of Gram positive or Gram negative organisms.
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Differential Media Differential media : allows you to differentiate between two colonies of bacteria growing on the same plate. Many times, differential media can be used to distinguish pathogenic bacteria from non-pathogenic bacteria from the same source.
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Selective and Differential Agars Selective medias and differential medias are often combined in a single media in order to select for specific organisms and differentiate between pathogenic and non- pathogenic strains or species. In today’s lab, we will examine four medias that are both selective and differential. Blood Agar Mannitol Salt Agar MacConkey Agar Eosin Methylene Blue Agar
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Blood Agar Blood agar is used for the isolation and differentiation of Gram positive cocci, specifically Streptococcus species. Blood agar is selective for Streptococcus Blood agar is differential for an organisms ability to hemolyze red blood cells.
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