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Because 7.5% NaCl agar inhibits gram negative organisms from growing, and is "selective" in that only gram positive organisms can grow in this type of agar.
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Composition of selective media?
selective media isl ike enrichment media with the difference that inhibiting substance is added to solid medium, e.g. deoxycholate citrate medium which contains nutrient agar, sodium deoxycholate , sodium citrates lactose and neutral red.
Why is Msa argar a selective medium?
Mannitol Salt Agar is selective for staphylococci as the high salt (sodium chloride) levels prohibit most other bacteria from surviving and it is differential as Staphylococci ferment mannitol, producing acid, lowering the pH and turning the media yellow. The development of yellow media presumes the bacteria to be pathogenic Staphylococcus (usually S. aureus). From A Photographic Atlas for the Microbiology Laboratory by Leboffe and Pierce.
Is the media for oxidase test selective or differential?
media used for oxidase test is non selective media
What is the principle of selective media?
Scientists in a lab use selective media and differential media to identify or isolate organisms. Selective media allows only certain types of organisms to grow.
Is a tsa agar selective or differential?
its a selective media
What is the function of sodium deoxycholate in media?
To act as a biological detergent that lyses cells. To act as a biological detergent that lyses cells.
Why are crystal violet agar 7.5 sodium chloride agar considered selective media?
7.5% NaCl inhibits growth of certain bacteria. This type of selective media allows for the growth of Staph. A high concentration of NaCl alters the osmotic balance between the media and the bacterium, NaCl plasmolyzes the bacterium due to the hypertonicity of the medium. The circular shape of Staph allows it to better resist plasmolysis. Crystal Violet is a dye that inhibits the growth of certain Gram-positive bacteria, it does this by binding to the thick peptidoglycan layer preventing cross-linking and thus preventing cell growth.
Is Mueller Hinton agar is selective media?
no
How does selective media works in microbiology?
Selective media, is made up of certain nutrients that can either inhibit or enhance the growth of certain bacteria and or fungus. This is why they call it selective media, it is generally only selective for one kind of bacteria or does certain things when that bacteria or fungus is present.
What two media include elevated concentrations of sodium chloride for preventing growth of most bacteria?
mannitol salt agar is one of them, not sure about the other one
Which type of culture media is best for the growth of most chemoheterotrophic organisms?
selective media
What are the selective media for isolation of thermophiles?
thermus agar
