Re: Radiation Resistant Bacteria

[daleboyce@charter.net]

Hi Andre,



Take a look on the web for Deinococcus Radiodurans it is supposedly the most

radiation resistant bacteria known and is used and a Biological Indicator

(BI) in validating radiation sterilization procedures for FDA approval.

Before anyone gets worried about an irradiated mutant strain of it infecting

people around Hanford, this bacteria has been known for some time.  It is

non-infectious.  As I remember it likes to hang out in nasty places like

volcanic vents, and has developed some pretty neat survival adaptations like

redundant DNA.



2000 Gy may not be out of line.  I seem to recall that it can be cultured

from samples irradiated to 250 Gy, but it has been awhile since I looked.

The info is out there on the web once you have the name.



Dale

daleboyce@charter.net







----- Original Message ----- 

From: "andre geerdink" <volkswagen181@hotmail.com>

To: <james.g.barnes@att.net>; <radsafe@list.Vanderbilt.Edu>;

<rad-sci-l@ans.ep.wisc.edu>

Sent: Friday, June 04, 2004 9:00 AM

Subject: RE: Radiation Resistant Bacteria





> Dear Listers,

>

> Years ago i tried to find out how much radiation is needed to sterilise

some

> sensitive instruments. I was adviced to irradiate to at least 2000 Gy to

be

> sure i killed all bacteria. This would take irradiation the during whole

> weekend.

> Does anyone know if these numbers can be correct?

> Also i wonder what is the actual radiation dose for the bacteria found

under

> these tanks?

>

> André Geerdink

>

>

> >The high levels of radiation in the soil would kill most micro-organisms.

> >Proteins from the bacteria were very different from those in scientific

> >databases, researchers said, indicating that this class of organisms had

> >received very little study."

> >

> >

>

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