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Acid indicator

An acid indicator is a substance used to indicate the amount of acid in another substance.

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Conflicting results of Gram-Negative unknown

... layer 7. Citrate test *VERY CONFLICTED ABOUT RESULTS, RESULTS: Positive indicator would be color change of the media from green-ish blue to ROYAL ... media FLOW CHART looks something like this TSI SLANT (ALKALINE/ACID) = Lactose Negative Sulfer reduction of TSI slant= Negative then must ...

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by Jrh21854
Sun Dec 01, 2013 8:25 pm
Forum: Microbiology
Topic: Conflicting results of Gram-Negative unknown
Replies: 0
Views: 3622

pH indicator in agar plates

... of yoghurt. I plan to measure this by quantifying the number of lactic acid bacteria in each sample by using bromocresol purple pH indicator. However, before I do the experiment, I was wondering what kinds of problems I can ...

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by ilovebiology77
Sat Feb 25, 2012 10:35 pm
Forum: Microbiology
Topic: pH indicator in agar plates
Replies: 0
Views: 1053

What is the difference between using a BCP Agar Shake and a

... that a Brom Cresol Purple (BCP) Agar shake is used to test for pH (ie, acid end products) as well as gaseous end products... As far as I know, Phenol Red Carbohydrate Broth also contains a pH indicator, as well as a Durham fermentation tube to capture gaseous output, and ...

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by raelake
Thu Jan 26, 2012 12:02 am
Forum: Microbiology
Topic: What is the difference between using a BCP Agar Shake and a
Replies: 1
Views: 1497

My undergraduate thesis project - Lactose metabolism

... I used glucose and lactose broth and phenol red as the pH indicator. What happen to those medium were that in glucose medium, the bacteria started fermenting it and after 48h it produced acid and gas (the medium turns yellow). But when it's incubated in lactose medium, ...

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by victor
Tue Nov 04, 2008 3:10 pm
Forum: Microbiology
Topic: My undergraduate thesis project - Lactose metabolism
Replies: 2
Views: 3683

help identifying unknown bacteria

... and incubation on a BA plate gave me nonhemolysis. I did test for acid from glucose, but I had to redo it (and am currently waiting on the results) since after a 2-day period, the indicator turned an a uniform orangish color, instead of yellow (positive for acid). ...

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by creidesca
Sat Dec 01, 2007 7:20 pm
Forum: Microbiology
Topic: help identifying unknown bacteria
Replies: 6
Views: 106431
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