IUBio Biosequences .. Software .. Molbio soft .. Network News .. FTP

How animals in the hydrothermal vent can live with the high temperature.

Jonathan Silverlight jsilver at merseia.fsnet.co.uk
Fri Mar 29 17:34:17 EST 2002

In message <3ca6328b.30094403 at news.earthlink.net>, Davin C. Enigl 
<enigl at aol.com> writes
>On Wed, 27 Mar 2002 22:23:53 +0000, Jonathan Silverlight
><jsilver at merseia.fsnet.co.uk> wrote:
>>I'm fairly sure you can't simply "correct" in that way. Heat proteins to
>>400C and they will melt, or at least denature, whatever the pressure.
>That is not high enough to denature prions.

I think you will find that there is no detectable protein at a much 
lower temperature. AFAIK the only study of the actual protein content is 
by Appel et al. and they only went up to about 200C.

>As far as pressure, my experiments showed not even a one log reduction
>(and no calculable D-value) up to 65,000 psi in liquid as long as the
>pressure did not drop suddenly.  So survival at a constant 65,000 psi
>was no problem for my test bacteria.
>Does anyone know what the psi is at the deep sea vents?  How does the
>pressure there, compare to 65,000 psi?

Well, IIRC the pressure increases by 1 atmosphere for every 33 feet (I'm 
too old to think metric right now :-) so it's about 1000 atmospheres 
(14000 psi) at the bottom of the deepest trench.
Are you the guy who published that study of bacteria surviving in a 
diamond anvil? It was quite widely reported here and the reports were 
saying the pressure was equivalent to many kilometres depth of the 
Earth's crust - or Europan ice. Amazing.

More information about the Microbio mailing list

Send comments to us at biosci-help [At] net.bio.net