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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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∙ 9y 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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∙ 10y 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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Does enterococcus faecalis grow on macConkey agar?
this MacConkey with crystal violet can grow enterococcus
What is the culture characteristic of Ecoli thst grow on macconkey agar?
E.coli shows pink colour colonies in MacConkey agar due to fermentation of lactose
Why is micrococcus luteus negative for oxidase?
You probably got a false negative. M. luteus should be oxidase +. To determine M. luteus do a MSA plate which should not produce acid and barley grow. That means the plate will look red with a streak of yellow colonies due to the fact that M. luteus produces a yellow pigment.
Macconkey agar is a selective medium and it is also a defined or a undefined medium so why is that a formulation desirable?
This type of agar is designed to grow gram-negative bacteria. It will not grow gram-positive bacteria due to a dye in the formula of the agar.
Can Pseudomonas fluorescens grow on MacConkey agar?
Yes. But because it is not a lactose fermenter, the colonies will be colorless (or sometimes have a green tint).
Does micrococcus luteus grow on msa plates?
Yes micrococcus luteus, along with micrococcus roseus both grow on MSA. But, they do not fermente on this agar giving a negative test. However, Staphylococcus aureus grows on MSA and fermentes giving a positive test. *Side note* MSA plate is used to test for G+ coccus. The plate contains salt and salt "loving" bacteria will grow and show yellow colony, example of S. aureus.
How do you grow Klebsiella pneumoniae?
MacConkey agar
Does enterococcus faecalis grow on macConkey agar?
this MacConkey with crystal violet can grow enterococcus
Will Alcaligenes faecalis grow on MacConkey agar?
yes
If an organism can grow on both a nutrient agar and a MacConkey Agar on which would you expect it to grow better?
The organism would be expected to grow better in nutrient agar. Nutrient agar is rich in nutrients and microorganisms grow well when there is availability of nutrients.
What is the culture characteristic of Ecoli thst grow on macconkey agar?
E.coli shows pink colour colonies in MacConkey agar due to fermentation of lactose
Why won't campylobacter jejuni grow on macconkey agar?
campylobacter can growth in mcconkey agar.
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?
You probably got a false negative. M. luteus should be oxidase +. To determine M. luteus do a MSA plate which should not produce acid and barley grow. That means the plate will look red with a streak of yellow colonies due to the fact that M. luteus produces a yellow pigment.
Macconkey agar is a selective medium and it is also a defined or a undefined medium so why is that a formulation desirable?
This type of agar is designed to grow gram-negative bacteria. It will not grow gram-positive bacteria due to a dye in the formula of the agar.
Does Staphylococcus grow on non crystal violet MacConkey agar?
Staphylococcus will not grow on Mac since crystal violet inhibits the growth of Gram positivesfmchinea: Actually some species of staphylococcus grow on MacConkey's plate including Staphylococcus aureus.
Can Pseudomonas fluorescens grow on MacConkey agar?
Yes. But because it is not a lactose fermenter, the colonies will be colorless (or sometimes have a green tint).
