5373
Can survive after long term exposure to cold
<P><B><I>Exiguobacterium sibiricum</I> 255-15</B>. This organism was isolated from a 2-3 million-year permafrost core in Siberia, Russia and can survive and grow rapidly at low temperatures. Analysis of long-term survival of psychrophilic organisms such as this one may aid understanding of the potential growth of organisms in astrobiology.