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Re: Fwd: Re: Did the K-T impact event seed Titan with life?
On Sun, 19 Mar 2006 21:44:32 +0100 David Marjanovic
> It should be mentioned that very, very few bacteria sporulate.
> *Clostridium*, and not much else.
_Bacillus anthracis_ is ubiquitous in Earth's soil. One cubic meter of
soil from my back yard (and probably from your back yard, too) contains
roughly 1,000 anthrax spores (on average).
And that is considered to be a nonpathogenic concentration (i.e.,
"harmless"). In contrast, pathogenic soils may contain upwards of
500,000+ anthrax spores per 1 cubic meter of soil.
The problem is that the Chicxulub impact site was on a marine shelf, not
on terrestrial soil. Therefore, probably very few to no anthrax spores
hitched a space ride on the Chicxulub Express.
As far as considering other _Bacillus_ species, who knows. Are there any
marine _B_ species?