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Re: Killie Fry and velvet
On 1 Jul 2001, at 9:00, Mach Fukada wrote:
> Hi Bill,
> That sounds more like a bacterial infection than velvet if it was
> inhibited by peat.
Got to agree here Mach, Bill it sounds more like a
bacteria than a velvet infection.
> I recall many bacteria are inhibited by acidic (lower
> pH) situations.
That is one possibilty... Various moss species produce
antibitoic compounds (moss, growing in nutrient poor
situations don't like compettion). If the peat was of
the fibrous mossy stuff then that could explain the
"cure".
The "Greenmoss" that was mentioned some months back
appears to have these properties.
> Supposedly this is why there are problems with canning
> non-acidic foods as the anaerobic, non-acidic conditions are ideal for
> botulism. I suspect that there are other bacteria that are inhibited by
> acidic conditions.
The acidity issue has it routes in the manner how the
bacteria generate their ATP. They set up proton
gradients accross their cell walls. The higher the
proton (H+) concentration already outside their cell
wall the more difficult it becomes to maintain the
gradient used to generate ATP. Eventually the proton
concentrations equilibriate between the medium and
cytoplasm and that is when the bacteria's ticket gets
punched... This type of inhibition is just as effective
under aerobic and anaerobic conditions.
Under anaerobic conditions bacteria can still live by
means of glycolysis (metabolism of glucose to pyruvate +
2H+). Increased proton concentration (a low pH) puts
pressure on the metabolism, slowing the rate of
glycolysis and making the bacteria very unhappy.
As a side note, some canned good are now being
innoculated with bacteria of the genus Leuconostoc (if I
recall correctly). These bacteria produce antimicrobial
peptides that rip the cells walls of other bacter apart
or punch holes through them and disrupting the ion
gradients the bacteria use to generate their ATP and
other "energy" carriers.
> BTW: the fish you sent to me are doing great. The zygamia are starting
> to spawn, not nearly as prolific as the occelatum..
We had occelatum here once upon a time... Also bred like
rabbits but when summer came... Well, we don't have
occelatum any more.
Watch out for the heat Mach. It only took 1 week at 27oC
to do these guys in.
Bye
Tyrone Genade
Southern African Killifish Society Coastal & Offshore Coordinator
AKA 08248
tyronegenade at yahoo_com
http://www.geocities.com/tyronegenade
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P450 Lab, Biochemistry Department
University of Stellenbosch, 7602, South Africa
Ph: +27-021-808-5876, fax: +27-021-808-5863
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but in all others I must have irrefutable proof!
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