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Indicators

Indicators and reagents

substances used for the detection, identification, analysis, etc. Of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., colour, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidisers, reducers, fluxes, and colourimetric reagents.


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Re: Characteristics of Good Indicator Organisms?

... response to changing ecosystem integrity should be consistent in time and space. 4.It should be better than or complementary to other potential indicators.

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by hilljason
Sat Jun 01, 2013 6:53 am
 
Forum: Microbiology
Topic: Characteristics of Good Indicator Organisms?
Replies: 2
Views: 4075

Does an advanced algo of aggregation and ranking interesting

... me I can send more documents. Thanks Remi remi@cfar-m.com ________________________ CFAR-m features Aggregation is a way to combine several single indicators representing different components (dimensions) of the same concept to form a single aggregate. The result leads to a single score, called ...

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by remimollicone
Fri Aug 10, 2012 6:36 am
 
Forum: Genetics
Topic: Does an advanced algo of aggregation and ranking interesting
Replies: 0
Views: 2691

how long does a bacteria lives in a water

Supposedly not that good, but probably better than was thought. They are indicators because they do not survive well, i.e. they are valuable because they are telling you that some fecal contamination entered water recently.

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by canalon
Thu Apr 12, 2012 3:05 am
 
Forum: General Discussion
Topic: how long does a bacteria lives in a water
Replies: 10
Views: 4715

Are there any pH indicators which can kill bacteria?

Some dyes like rose bengal are used functionally in selective media but I'm not aware of selective dyes used as pH indicators. I'd sure validate whatever you use.

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by JorgeLobo
Wed Feb 29, 2012 10:10 am
 
Forum: Microbiology
Topic: Are there any pH indicators which can kill bacteria?
Replies: 2
Views: 1072

Are there any pH indicators which can kill bacteria?

I'm thinking of using bromocresol purple to identify lactic acid bacteria colonies but was wondering whether there are any I should definitely avoid as it could kill or inhibit the bacteria in any way? Thank you :)

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by ilovebiology77
Tue Feb 28, 2012 7:56 pm
 
Forum: Microbiology
Topic: Are there any pH indicators which can kill bacteria?
Replies: 2
Views: 1072
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