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Alpha hemolysis

Definition

noun

A partial hemolysis on blood agar plates as indicated by a green discoloration around the bacterial colony.


Supplement

The hemolytic reactions of streptococci on blood agar plates can be used for their preliminary identification and classification. For instance, Streptococcus pneumoniae forms alpha hemolysis, Streptococcus pyogenes forms beta hemolysis, and Enterococcus faecalis displays gamma hemolysis on blood agar plates.

Variant: α-hemolysis.

Synonyms:


Compare: beta hemolysis, gamma hemolysis


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Re: Streptococcus sanguis??

... and time with irrelevant tests. Please determine if this isolate shows alpha hemolysis on blood agar.

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by Cepacia
Sat Dec 21, 2013 1:22 pm
 
Forum: Microbiology
Topic: Streptococcus sanguis??
Replies: 1
Views: 2426

Black coloration of sheep blood agar

... sheep blood agar caused by bacterial grow? At first I though it was an alpha hemolysis, but I think it is not since it should be yellow and green, not black. the black ...

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by triton
Wed Aug 22, 2012 8:19 am
 
Forum: Microbiology
Topic: Black coloration of sheep blood agar
Replies: 3
Views: 6586

Re: NEED HELP WITH MY UNKNOWN GRAM POSITIVE ORGANISM PLEASE??

... looking medium-large sized colonies 3) on blood agar = beta hemolysis 4) on mannitol salt agar = growth (yellow looking colonies) because ... chains (because strep divide in a single plane) 2) on blood agar = alpha, beta or even gamma hemolysis (no hemolysis). it all depends on the ...

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by mariah000
Sun Mar 18, 2012 7:50 pm
 
Forum: Microbiology
Topic: NEED HELP WITH MY UNKNOWN GRAM POSITIVE ORGANISM PLEASE??
Replies: 1
Views: 17708

How does this bacteria look like on these agars?

... round, small, pinpoint, irregular, etc??) **I already know that it's alpha hemolytic. so has greenish halo around the colonies when grown on blood ... (is this accurate?) :arrow: My blood agar came out with green alpha hemolysis but very dull and kinda brownish looking. though I went ahead with ...

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by SweetSarah
Wed Mar 07, 2012 9:28 am
 
Forum: Microbiology
Topic: How does this bacteria look like on these agars?
Replies: 0
Views: 1314

Re:

... black color shouldn't even be there in first place and that there was hemolysis on my plate. It was just hard to see before. Now I've done most ... it's probably was contaminated but couldn't say for sure. Also, the alpha hemolysis was pretty hard to find since the plate was darkened. Have ...

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by SweetSarah
Mon Mar 05, 2012 10:53 am
 
Forum: Microbiology
Topic: Can micrococcus form H2S or black coloration on media?
Replies: 2
Views: 2147
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