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MacConkey agar is designed to grow Gram-negative bacteria and also contains crystal violet dye which inhibits the growth of Gram-positive bacteria. Since S. aureus is Gram-positive it should not grow on MacConkey agar. No. MacConkey agar inhibits MOST of the Gram-positive bacteria. There are some Gram-positive bacteria that can tolerate bile-salt are able to grow in MacConkey agar. Enterococcus and some species of Staphylococcus are able to grow in MacConkey. (lack citation though)
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∙ 15y ago
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∙ 10y agoA minimal amount of normal gram positive intestinal flora can theoretically grow on a Macconkey agar. However, none are known to have actually grown on it.
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∙ 13y agoNo. MacConkey agar is used to grow gram negative bacilli
S. epidermidis is gram positive cocci
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∙ 11y agono bile salts inhibit all sp of streptococci except enterococci
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∙ 11y agoNo, MacConkey agar is selective for Gram negative bacteria. Bacillus subtilis is a Gram positive bacterium. So there should be little to no growth on the MacConkey agar.
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∙ 10y agoI don't think so, because the bile salts in McConkey agar will kill it. but I suppose Streptococcus agalactie could.
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∙ 14y agoyes. since streptococcus is gram positive though it will not grow on MacConkey's or SSA (salmonella-shigella agar)
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∙ 13y agono because it is gram positive and MacConkey agar does not allow growth of most gram positive bacteria due to presence of crystal violet
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Is micrococcus luteus a facultative anaerobe?
Yes, Micrococcus luteus is a facultative anaerobe, meaning it can grow in both the presence and absence of oxygen. It has the ability to switch between aerobic and anaerobic metabolism depending on the availability of oxygen in its environment.
Does enterococcus faecalis grow on macConkey agar?
Enterococcus faecalis typically does not grow on MacConkey agar as this selective and differential medium is primarily used for isolating and differentiating members of the Enterobacteriaceae family, which are mostly gram-negative bacteria. Enterococcus species are gram-positive bacteria and do not ferment lactose, the key ingredient in MacConkey agar that allows for differentiation.
What is the culture characteristic of Ecoli thst grow on macconkey agar?
E. coli that grow on MacConkey agar typically exhibit lactose fermentation, causing them to produce pink or red colonies. These colonies may also appear mucoid due to the production of a polysaccharide capsule. Additionally, E. coli on MacConkey agar will typically not grow well under acidic conditions, as the agar contains crystal violet which inhibits the growth of Gram-positive bacteria.
What is the name of yellow bacteria that grows on agar and eats oatmeal with one drop of water on it?
The yellow bacteria that grows on agar and feeds on oatmeal with a drop of water is likely the species Micrococcus luteus. This bacterium is commonly used in laboratory settings for its distinctive yellow pigmentation and ability to grow on simple media like agar and oatmeal.
Why is micrococcus luteus negative for oxidase?
Micrococcus luteus is negative for oxidase because it lacks the cytochrome c oxidase enzyme necessary to produce a positive oxidase reaction. The absence of this enzyme prevents the organism from undergoing the oxidation-reduction reaction typically measured by an oxidase test.
Does micrococcus luteus grow on msa plates?
Micrococcus luteus is not commonly found on Mannitol Salt Agar (MSA) plates because M. luteus is not a halophilic bacteria that thrives in high salt conditions, which are present in MSA. However, it is always possible for environmental isolates to vary so it's best to perform a culture test to confirm its growth on MSA plates.
How do you grow Klebsiella pneumoniae?
MacConkey agar
Does enterococcus faecalis grow on macConkey agar?
Enterococcus faecalis typically does not grow on MacConkey agar as this selective and differential medium is primarily used for isolating and differentiating members of the Enterobacteriaceae family, which are mostly gram-negative bacteria. Enterococcus species are gram-positive bacteria and do not ferment lactose, the key ingredient in MacConkey agar that allows for differentiation.
Is micrococcus luteus a facultative anaerobe?
Yes, Micrococcus luteus is a facultative anaerobe, meaning it can grow in both the presence and absence of oxygen. It has the ability to switch between aerobic and anaerobic metabolism depending on the availability of oxygen in its environment.
Will Alcaligenes faecalis grow on MacConkey agar?
No, Alcaligenes faecalis will not grow on MacConkey agar. MacConkey agar is selective for gram-negative bacteria that ferment lactose. Alcaligenes faecalis is a gram-negative bacteria that does not ferment lactose, so it will not grow on MacConkey agar.
Why won't campylobacter jejuni grow on macconkey agar?
Campylobacter jejuni will not grow on MacConkey agar because it is a selective and differential medium designed to support the growth of Gram-negative enteric bacteria while inhibiting the growth of Gram-positive bacteria. Campylobacter jejuni is a Gram-negative bacterium, but it is not an enteric bacterium, so it lacks the specific enzymes needed to utilize the nutrients in MacConkey agar for growth.
Does Staphylococcus grow on non crystal violet MacConkey agar?
No, Staphylococcus does not typically grow on MacConkey agar, regardless of the absence of crystal violet. MacConkey agar is selective for Gram-negative bacteria like Escherichia coli, and inhibitory to most Gram-positive species.
What is the culture characteristic of Ecoli thst grow on macconkey agar?
E. coli that grow on MacConkey agar typically exhibit lactose fermentation, causing them to produce pink or red colonies. These colonies may also appear mucoid due to the production of a polysaccharide capsule. Additionally, E. coli on MacConkey agar will typically not grow well under acidic conditions, as the agar contains crystal violet which inhibits the growth of Gram-positive bacteria.
If an organism can grow on both a nutrient agar and a MacConkey Agar on which would you expect it to grow better?
You would expect the organism to grow better on nutrient agar because it is a general-purpose medium that supports the growth of a wide range of organisms. MacConkey agar, on the other hand, contains inhibitors that selectively inhibit the growth of Gram-negative bacteria, so the organism may not grow as well on this medium.
What is the name of yellow bacteria that grows on agar and eats oatmeal with one drop of water on it?
The yellow bacteria that grows on agar and feeds on oatmeal with a drop of water is likely the species Micrococcus luteus. This bacterium is commonly used in laboratory settings for its distinctive yellow pigmentation and ability to grow on simple media like agar and oatmeal.
Crystal violet in the MacConkey agar?
MacConkey's agar refers to a culture medium that is designed to selectively grow Gram-negative bacteria. It contains crystal violet dye, which inhibits certain Gram-positive bacteria.
Why is micrococcus luteus negative for oxidase?
Micrococcus luteus is negative for oxidase because it lacks the cytochrome c oxidase enzyme necessary to produce a positive oxidase reaction. The absence of this enzyme prevents the organism from undergoing the oxidation-reduction reaction typically measured by an oxidase test.
