Re: Can Bacteria Digest and Metabolize Lipids?


"JEDilworth" <bactitech@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:xaSdnWPGlaI0w4XZRVn-tQ@xxxxxxxxxxxxxxxxxxxxxx
Pseudo never has smelled "grapey" to me - distinctive, yes. I'd
recognize the smell anywhere; however, I wouldn't describe it as
grapey....

Definitely grapey - especially with growth in liquid medium. After overnight
growth of a lab strain in LB medium in a test tube, the culture is a normal
beigey color - when the tube is swirled, the tube turns green. [not saying
that the smell is due to the pigment). And the smell is grapey. In my
experience P. aeruginosa clinical isolates on blood agar aren't so grapey.
But I'm not the only one who says so. Google "pseudomonas grapey" or
"pseudomonas grape smell" and find that others think so too. See:

http://medinfo.ufl.edu/year2/mmid/bms5300/bugs/pseaerug.html.

Although, there is an entry
http://www.bio.net/bionet/mm/microbio/2000-August/018688.html
where the writer says he doesn't smell the grape odor, even though he's
always been told it was grapey.
Here's a paper that identifies the grapey smelling compound: J Clin
Microbiol. 1979 Apr;9(4):479-84.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=110829&dopt=Abstract

It's 2-aminoacetophenone. These folks indicate that the odor is hard to
smell in liquid- but the compound can be isolated from bugs grown on blood
agar.
--
lynx - in a Googly mood

I've never heard of geosmin. Is this a compound or a gas? We just smell
'em and report 'em :-).

Judy Dilworth, M.T. (ASCP)
Microbiology

"lynx" <silverly@xxxxxxxxxxxxx> wrote in message
news:rcmdnb4BOJyTX4rZnZ2dnUVZ_tednZ2d@xxxxxxxxxxxxxx

The smell of Streptomycetes is due to geosmin production.
That was a very good description of bug smells, Judy!
I like the grapey smell of Pseudomonas aeruginosa.



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