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How would removing the crystal violet from MacConkey agar alter the sensitivity and specificity of the medium?
Wiki User
∙ 13y ago
It would allow growth of Gram-positive cocci.
Wiki User
∙ 13y ago
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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.
What are the MacConkey test results for s epidermidis?
There is no growth because S.Epidermidis is a gram positive bacteria. MacConkey selects for gram negatives. the bile salts and crystal violet inhibit gram positive growth in the medium
Why most of the gram positive bacteria cannot grow on MacConkey Agar?
gram positive bacteria cannot grow due to the presence of bile salts and crystal violet in maConkey media.
What microorganism forms a pink colony on MacConkey agar?
Well, Macconkey Agar II plates have Gram Crystal Violet in them so there are a number of bacterial species that can absorb it and turn "very pink." The way to narrow it down is to identify whether it grows in chains or clusters. But other than that, it is hard to tell.
What is raphide crystal?
A raphide crystal is a spherical ball that has little spikes on them. They are blue and they will be poisonous when they have calcium oxalate.
Does enterococcus faecalis grow on macConkey agar?
this MacConkey with crystal violet can grow enterococcus
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.
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.
What is the name of the acide base color indicator found in MacConkey agar?
Lac+ bacteria is acid base color indicator that lowers the pH of the MacConkey agar. The MacConkey agar contains neutral red dye, lactose, peptone, and crystal violet dye.
What are the MacConkey test results for s epidermidis?
There is no growth because S.Epidermidis is a gram positive bacteria. MacConkey selects for gram negatives. the bile salts and crystal violet inhibit gram positive growth in the medium
Does micrococcus luteus grow on macconkey agar?
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)
What is macconkey agar made out of?
Macconkey agar consists of agar, lactose, peptone, neutral red dye, crystal violet dye & bile salts. Bile salts inhibit growth of Gram positive bacteria & allow growth of Gram negative bacteria only. It differentiates lactose fermentating Gram negative bacteria from non lactose fermentating Gram negative bacteria.
Why most of the gram positive bacteria cannot grow on MacConkey Agar?
gram positive bacteria cannot grow due to the presence of bile salts and crystal violet in maConkey media.
What is the indicator that turns the agar medium pink with copper?
MacConkey agar contains bile salts, lactose, peptone. crystal violet dye, and neutral red dye. The agar appears a medium pink with a copper undertone.
What part of the silver halide crystal is most affected by light when film is exposed?
The part of the silver halide crystal that is most affected by light when film is exposed is the surface. More specifically, any sensitivity specks that can become metallic silver.
Will coyotes eat the flesh of a dead crystal meth user?
Not likely, due to the sensitivity of the coyote's olfactory capabilities. It seems they sense the poison that saturatesthe cadaver.
What microorganism forms a pink colony on MacConkey agar?
Well, Macconkey Agar II plates have Gram Crystal Violet in them so there are a number of bacterial species that can absorb it and turn "very pink." The way to narrow it down is to identify whether it grows in chains or clusters. But other than that, it is hard to tell.
