Re: Temperature Clues
michael.goodrich_at_gmail.com
Date: 02/25/05
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Date: Fri, 25 Feb 2005 13:43:50 -0500 (EST)
Tom Hendricks wrote:
> michael.goodrich@gmail.com wrote:
> > TomHendricks474@cs.com wrote:
> > > The rates of biological processes increase between
> > > 2 and 4 times for each 10C rise in temperature throughout the
> > > physiological range. Thus if the origin of life is dependent on
> > > the rate of biological processes, and a temperature near
> > > the high end of liquid water is in all other ways supportive of
> > > the origin of life: then
> > > life is most likely to start in an environment
> > > with temperatures around 100C.
> > > Also as the earth cooled, life would have to adapt to the slowing
> > > rate of biological processes.
> > >
> > > AND
> > > Because enzyme functions only when they assume the proper shape,
> > > and too hot may open that structure or unfold the enzyme, while
> > > too cold and it may close up, preventing substates from binding
> > > properly - then this suggests that enzymes are in that
> > > goldilocks zone - not too hot and not too cold - and thus are
> > > adapted to earth's heat cycle which in turn is driven by
> > > the Sun's heat cycle.
> > > Thus I suggest that ultimately enzymes are adapted to the
> > > sun's heat cycle.
> > >
> > > Comment?
> >
> >
> >
> > What about the deleterious effects of entropic considerations at
> > elevated temperatures for origin-of-life?
>
> Well there are many. Name one and we'll look at it.
>
> Here are some points. Life started quickly so it almost had
> to have been hot that early on. Also with a hot sun we
> have a forced metabolism (daily forced energy source) on every
> aspect of the origin. With a hot sun you have a forced replication
> similar to PCR where paired nucleotides are denatured in high heat
> and annealed in low. and remember melting temp of RNA is higher than
> DNA and not far below 100C.
>
> Most scenarios have a pop and adapt idea. Life pops up and then
> adapts to the environment. Yet there is no grace period where
> the environment lets anything, that is not born adapted, - survive.
> I suggest an adapt and then pop idea.
> Any aspects leading to life are FIRST adapted to the hot sun cycle
> and they are stable in it. Then through the continual forced energy
> on the entire planet some of these stable variants become more
> stable through metabolism and replication and cells etc.
> Thus life is not an single fluke event, but a forced energy response
> to the sun, then an adaptation to that sun cycle - planet wide.
> Also the strong UV would play a major part - with less absorption
> of paired strands over single strands, with no UV dimers on purines
> (a purine world?) and UV dimers on pyrimidines.
>
> In this hot temp there would be a forced PCR type daily cycle of
> denaturing most paired nucleotides and annealing them in novel
> new forms, etc.
>
> And finally if that is STILL too hot, drop it to 90C or 80C etc.
>
> Comment?
What I was really interested in was how seriously you had considered
the deleterious effects of entropic considerations especially as the
temperature increases, when you seem prone to say things like "Life
started quickly ...", "Life ... is a forced energy response to the
sun", etc.
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