Indicators Flashcards
1
Q
- used in the GasPak
- white when reduced, blue when oxidized
A
methylene blue
2
Q
- used in the oxidase test
- dark blue/maroon, oxidized
- no color change, reduced
A
- positive
- negative
p-amino-dimethylalinine monohydrochloride
3
Q
- used in carbohydrate broth, KIA agar
- yellow when acidic
- red/pink/orange when basic
A
phenol red
4
Q
- used to determine if nitrite is in a solution
- turns red if present, colorless if not
A
Nitrate A and Nitrate B reagents
5
Q
- red/pink in acidic environments
- yellow in basic environment
A
neutral red
6
Q
bile salts and crystal violet; they are nutritionally fastidious
A
what are selective components of macconkey agar and why do they inhibit G+ growth
7
Q
blue green pigment that is water soluble and tested for by Pseudosel agar
A
Pyocyanin
8
Q
A quaternary ammonium compound that inhibits growth of other pseudomonas species
A
Cetrimide
9
Q
- lime-green pigment produced by pseudomonas species
- best observed under UV light
- tested for by Pseudomonas Agar F
A
Fluorescein
10
Q
- forms red ring around top of broth when indole is present
- used in the indole test
A
Kovac’s Reagent
11
Q
- red/dark orange when acidic
- yellowish orange when neutral
A
Methyl Red
12
Q
- two reagents used in VP test
- form red layer in upper portion of the broth when reacting with diacetyl
A
Barritt’s A and Barritt’s B reagents
