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How would the IMVic tests differentiate E. 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.
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.
Does E. coli test positive for oxidase?
no
Sim test for E. coli?
Negative
What is the color change of maltose in a Benedict's test?
A red precipitate is formed.
Does E. coli have flagella or pili?
There are many types of E. coli. Some do express motility; which can be determined with the results of a MIO test.
Which strain Ecoli detected by sereny test?
Enteroinvasive E. Coli
Does Ecoli produce catalase?
E. coli is catalyse test positive.
Does escherichia coli give a negative result for citrate test?
No, it is present/positive. • Cocci* • Gram-Positive* • Non-motile* • No Capsules* • No Spores* • Facultative Aerobe* • No Glucose, Lactose*, Mannitol* Fermentation • No Urease*, Catalase*, Oxidase*, Ligase*, Protease* Production • Production of Indole*, tryptophonase*
Why do you use a metal-nitrate in a flame test?
it doesnt change the color of the flame.
Does E. faecalis test positive for MSA agar test?
yes it will ferment the mannitol and cause yellow color change.
How do you know that the amylase did not have any contaminating maltose?
because the sample didn't change color. Negative sugar/IKI test. No change from original blue bright color.
