Bluestem Associates wrote:
> On Thu, 20 May 1999 14:08:21 -0500, Ronald Nigh wrote:
>
> >And of course the exact same nitrogenase (only one has eolved) catalyzes
> >free-living N fization as well.
>
> There are some fairly good indications that *vanadium* is a facultative
> (and perhaps obligate) substitution for molydenum in several genera of
> non-symbiotic nitrogen fixers. I'm trying to find the citations, but
> so far without success.
>
> Some of the non-symbiotic microbes also run with an Fe-S flavour of
> nitrogenase.
>
> Most non-symbiotes would be doing very well to fix 50 kg/ha nitrogen.
> Except in fairly anaerobic environments -- rice, for example -- I
> wouldn't go out of my way to encourage them, to say nothing of *add*
> them to the soil. They are, however, a delightlfully fascinating
> component of creation.
>
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