(November 26, 2013 at 12:41 am)snowtracks Wrote:20%? No 85%(November 24, 2013 at 9:01 pm)Brakeman Wrote: http://www.talkorigins.org/indexcc/CB/CB040.html
Amino acids found in meteorites from space, which must have formed abiotically, also show significantly more of the left-handed variety, perhaps from circularly polarized UV light in the early solar system (Engel and Macko 1997; Cronin and Pizzarello 1999). The weak nuclear force, responsible for beta decay, produces only electrons with left-handed spin, and chemicals exposed to these electrons are far more likely to form left-handed crystals (Service 1999). Such mechanisms might also have been responsible for the prevalence of left-handed amino acids on earth.
credit is due where it's found, poster put some science out there.
"Amino acids found in meteorites from space",
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organic chemist w. bonner said he spent 25 years looking for a terrestrial mechanism for homochirality (one handedness) and didn't find in supporting evidence. so concluded that the source must be extraterrestrial.
"perhaps from circularly polarized UV light in the early solar system"
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using 100% circularly polarized uv light, the most successful lab expers. yielded only 20% excess lefthanded.
but this results was achieve not by production but by destruction. the uv light destroyed a large fraction of the amino acid, and depending on the directional rotation of the circular polarization, one configuration of the molecules suffered significantly more destruction than the other.
so the hunt has moved to extraterrestrial for a solution. so the appeal goes out to future again.
Since this initial discovery, Soai's group has gone on to present remarkable further observations of asymmetric amplification in the reaction that now bears his name. Enantiomeric excesses as high as 85% were reported for a reaction initiated with an initiator produced at 0.1% ee from exposure to circularly polarized light http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2857173/
Anyway, you continue to go down a wrong hole. Your claim that left hand vs right hand asymmetries are rare is not contrary to natural abiogenetic theory at all. It's rarity is expected. What would be needed to negate it would be a mechanism that makes it impossible, not simply rare.
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