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Most bacteria in Tribe V are able to utilize Citrate, with the exception of Hafnia and Pantoea (+/-). The 2 most common Klebsiella (oxytoca and pneumoniae), can utilize citrate, so should be citrate positive.
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∙ 13y ago
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∙ 15y agoyes, Bacillus subtilis has a positive reaction for both VP and citrate.
Lee Motsoahole
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∙ 13y agoBacillus cereus does not ferment citrate or sucrose.
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∙ 11y agoyes, turns purple to yello with production of gas and acidity
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∙ 11y agoIt is citrate positive
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∙ 11y agonegative
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Is staphylococcus aureus negative for the methyl red test?
no it is positive
HOW IS IT POSSIBLE FOR AN ORGANISM TO BE POSITIVE FOR GLUCOSE USE IN A PHENOL RED TEST BUT NEGATIVE IN THE METHYL RED TEST?
Methyl red differs from Phenolred (which is used in the fermentation test and the MSA plates) in that it is yellow at pH 6.2 and above and red at pH 4.4 and below. Phenol red turns yellow below a pH of 6.8. If you get a positive with methyl red and a negative with phenol red, the pH has to be between 6.7 and 6.1.
What bacteria is indole negative urea positive methyl red positive hydrogen sulfide positive and lactose negative?
urease negative
In methyl red testing what does E.coli do?
It would turn red
How IMViC tests differentiate Escherichia coli from Enterobacter aerogenes?
Indol Test ( Kovac's Reagent): E.a. = negative = yellow/gold ring at meniscus; as for E.c. = positive = red ring at meniscus (immediate change). Methyl Red Test (Methyl Red Reagent): E.a. = negative = yellow = pH > 7.0; as for E.c. = red color = pH < 5 (immediate change). Vogues-Proskauer Test (Napthol + KOH Reagent): E.a. = positive = reddish color (not immediate change); as for E.c. = negative = brown/yellow (straw color). Citrate (Bromothymol Blue Reagent - alkaline pH): E.a. = positive = blue color + growth; as for E.c. = negative = green color.
Is staphylococcus aureus methyl red positive?
yes
Is staphylococcus aureus negative for the methyl red test?
no it is positive
HOW IS IT POSSIBLE FOR AN ORGANISM TO BE POSITIVE FOR GLUCOSE USE IN A PHENOL RED TEST BUT NEGATIVE IN THE METHYL RED TEST?
Methyl red differs from Phenolred (which is used in the fermentation test and the MSA plates) in that it is yellow at pH 6.2 and above and red at pH 4.4 and below. Phenol red turns yellow below a pH of 6.8. If you get a positive with methyl red and a negative with phenol red, the pH has to be between 6.7 and 6.1.
What bacteria is indole negative urea positive methyl red positive hydrogen sulfide positive and lactose negative?
urease negative
Bacteria voges proskauer positive and methyl red positive?
Have a look at http://www.pmlmicro.com/assets/TDS/505.pdf
What would happen if you omitted methyl red in the reaction mixture?
methyl red will disappear
When do you use methyl red instead of phenol red?
You use methyl red as a ph indicator for for the MRVP test.
Why is methyl red indicator more suitable?
Methyl red is used as a pH indicator or for the identification of some bacteria.
What colour is methyl orange in ch3ooh?
The color of methyl orange is red. The color is red when the acetic acid is below pH 3.1.
What are 3 indcators?
Methyl Orange, Phenolphthalein, Litmus, Red Cabbage, Hydrangeas flower, Methyl red, Naptholpthalein, Bromophenol Blue
In methyl red testing what does E.coli do?
It would turn red
What can be added to HCl to turn red?
Methyl Red Indicator
