Blood agar used in strep tests which contains bovine heart blood that becomes transparent in the presence of hemolytic. What is a selective medium in microbiology.
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Test results must be interpreted in conjunction with gram stain morphology.
. Enterococcus hydrolyze esculin to products that react with ferric citrate in the medium to produce insoluble iron salts resulting in the blackening of the medium. Cetrimide agar is a type of agar used for the selective isolation of the gram-negative bacterium Pseudomonas aeruginosa. MacConkey Agar MAC is a selective and differential medium designed to isolate and differentiate enterics based on their ability to ferment lactose. As the name suggests it contains cetrimide which is the selective agent against alternate microbial flora.
Examples of differential media include. Lactose provides a source of fermentable carbohydrate allowing for differentiation. MacConkey MCK which is differential for lactose fermentationmannitol salt agar MSA which is differential for mannitol fermentation. Bile salts are the selective ingredient while esculin is the differential component.
Bile Esculin Agar is used primarily to differentiate. Cetrimide also enhances the production of Pseudomonas pigments such as pyocyanin and pyoverdine which show a characteristic blue-green and. Bile salts and crystal violet inhibit the growth of Gram positive organisms.
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| Know Your Micro Media Mannitol Salt Agar Msa Is A Selective And Differential Media The High Salt Content Selects For The Gen Microbiology Agar Fermentation |
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