Re: UV Boon or Destroyer

On Sep 25, 5:25=A0pm, Tom Hendricks <tom-hendri...@xxxxxxx> wrote:
On Sep 24, 12:18=3DA0pm, Alan Meyer <amey...@xxxxxxxxx> wrote:

If you have read my other posts, you would know that I think UV was
and is the main source of energy that chemicals responded to in the
origin.
It was the only constant source, that was also cyclical - two things
needed for 'life'.
The other energy sources I have ruled out. Vents sterilize, lightning
is too random, radiation was not enough, - For me life is so obviously a =
reaction to
and mimic of the sun heat =A0cycle, that I'm starting to take it for gran=
ted that
others feel the same way.

As you know, in my opinion, life did arise in response to the sun's
heat cycle but, however obvious you and I may find that, people in
general do not yet seem to recognize it.

I do not agree with your comments about UV. The thing about heat
energy at the earth's surface is that its photon energy is in the IR
and low enough that its molecular effects can be viewed at a
statistical level. This is why chemical thermodynamics is a valid
science and why I can make my argument about prebiotic oscillations
arising from equilibria shifting in response to temperature changes.
UV is different in that its photon energy is so high enough that a
single impacting photon can disrupt a molecular structure. Hence, I
suggest that, from an organochemical point of view, UV is a largely
destructive force that would always tend to randomize the primordial
soup. In terms of prebiotic evolution, this means that UV can provide
the energy needed to synthesize a great many molecules but, once those
molecule exist, they remain at risk of subsequent disruption by
further UV impacts.
From the point of view of prebiotic evolution, I therefore think that
prebiotic, evolutionary selection is likely to take the form of
protection from UV. I do not think in terms of materials being
preferentially synthesized as a result of the chemical effects of UV
irradiation but of their progressive accumulation as a result of being
located in UV protected environments.

.

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