Re: OOL II - Building Blocks
- From: "Perplexed in Peoria" <jimmenegay@xxxxxxxxxxxxx>
- Date: Wed, 6 Apr 2005 01:45:38 -0400 (EDT)
"Tom Hendricks" <tomhendricks474@xxxxxx> wrote in message news:d2ujij$201o$1@xxxxxxxxxxxxxxxxxxxxxx
> [Miller/Urey experiment]
> > > It's my understanding that several percent of the carbon got
> > > incorporated into a few amino acids, and that this quantity is much
> > > larger than expected per Beilstein prediction. Please comment.
> >
> > JM:- You should read Shapiro's book. I think you have been misled by soup
> > apologists. Actually glycine is the only biological amino acid
> > produced with much more than 1% yield. Alanine was also produced -
> > all three forms - L-alpha-alanine, D-alpha-alanine, and beta-alanine.
> > The biological form L-alpha-alanine was at about 1%. No other biological
> > amino acids were produced in quantities greater than 0.25%. Excluding
> > glycine, which comes in only one form, the production of non-biological
> > amino acids was greater than that of non-biological ones. Production
> > of both kinds of amino acids is much lower than the production of formate
> > and unanalyzed tars.
>
> One scientist (forgot who) suggested that the unanalyzed tars acted
> like time release capsules - that would replenish the soup (for those
> of us who still think prebiotic soup was important) as the environment
> broke it down.
An interesting idea. Or perhaps the tars were simply recycled to CO and
CO2 by subduction and vulcanism.
[snip]
> > JM:- The Miller experiment is of absolutely no interest in any scientific
> > theory regarding the origin of life on earth.
>
> OUCH. We differ here. I think what the M-U experiments showed beyond a
> doubt is that a heat cycle using UV/Sun began the origin process.
You also should read Shapiro (again?). Pay attention to what he says about
Myth being self-validating.
> He, Miller used lightning (it was easier and more Frankensteinian! -
> but he also used it in a precise way that would NOT recreate
> nature. No broth could be hit with such lightning regularity! Folow ups
> that used UV/sun work well and we know the sun was there and shined on a
> very regular basis.
> I again challenge you by asking if your chemistry could happen without
> a sun/star?
Well vent chemistry takes place several miles below sea level, and perhaps even
several miles below the ocean floor. The sun is completely irrelevant in this.
These processes would still take place if the Earth were parked in interstellar
space.
Well, let me add a couple of reservations to that. One is that the Earth probably
couldn't have formed in interstellar space. The sun is probably essential for that.
The second is that liquid ocean water may be a necessary lubricant for subduction.
If the oceans froze (as they would if the earth were not warmed by the sun), the
vents would still eject hot water. But they might stop running within a few million
years if the subduction stopped.
.
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