That's long been one of the biggest puzzles in understanding how life began, ... Or perhaps the asymmetry was random, differing between sites until one dominant enantiomer overwhelmed the other. Moreover, setting up the amplification conditions to truly mimic those of the prebiotic Earth is another challenge yet to be faced.
www.rsc.org/chemistryworld/News/2007/March/02030701.asp www.rsc.org/chemistryworld/News/2007/March/02030701.asp
Optical activity and life, as known an the earth, are two proper- ... questions arise : What is the origin of the dominant handedness of the fundamental constituents ... in one enantiomer and the amplification of asymmetry ? The results ...
www.springerlink.com/index/Q170863563477576.pdf
He started with a five percent ex­cess of one form of ami­no acid in wa­ter and dis­solved it. ... Could these observations be relevant to the emergence of L-enantiomers as the dominant amino acids on the earth? And, if so, could there be life elsewhere in the universe that is based upon the same amino acid handedness?”...
www.uncommondescent.com/biology/life-from-chiral-crysta... www.uncommondescent.com/biology/life-from-chiral-crystals-really/
BASF specialty foam in solar collectors from the heating technology company Viessmann ... The international heating systems manufacturer Viessmann, Germany, now uses Basotect® to insulate its solar collectors. The light, flame-retardant melamine resin foam ... Basotect shows good insulation properties over a long period,
www.media.basf.com/de/presse/
SDG is optically active with one dominant enantiomer in flaxseed, (+)-SDG of 99% (Ford et al., 2001). The presence of two enantiomers of SDG in plants might suggest that there are two distinct biochemical pathways for SDG biosynthesis (Davin & Lewis, 2003). Biosynthesis of (+)-SDG in planta begins with an...
diss-epsilon.slu.se/archive/00001699/01/The_Phenolic_Co... diss-epsilon.slu.se/archive/00001699/01/The_Phenolic_Complex.pdf
But if one variant is dominant or even exclusively present, ... This lipase, which is a chiral and single-enantiomer substance, is derived from a soil bacterium called Burkholderia plantarii. It ensures that only one enantiomer of the amine is involved in the chemical reaction while the other one leaves the reactor unaffected.
www2.basf.de/en/pharma/inside/2006-01/ten_years.htm www2.basf.de/en/pharma/inside/2006-01/ten_years.htm
Life is too complex to have happened by chance. ... Once the preference for one enantiomer over another gets started in nature, it is relatively easy to see how this preference is perpetuated. Biological reactions work much like machines having templates, stamping out the preferred, and ONLY the preferred...
www.talkorigins.org/faqs/faq-meritt/complexity.html www.talkorigins.org/faqs/faq-meritt/complexity.html
Similarly, the formation of ß-sheets arises from the association of chain segments containing at least seven residues of the same chirality (4, 5). This mechanism, although demonstrating how enantiomeric segregation may occur, does not explain the preference for one enantiomer over the other.
www.fasebj.org/cgi/content/full/12/6/503 www.fasebj.org/cgi/content/full/12/6/503
The Skeptic Tank text archives. ... }- If life arose by chance, half of the amino acids should be right-handed; in } fact, all are left-handed. Once the preference for one enantiomer over another gets started in nature, it is relatively easy to see how this preference is perpetuated.
www.skepticfiles.org/evolut/somefact.htm
This asymmetry can be amplified to nearly homochiral levels, thus providing the necessary prerequisite for life to start on this planet and elsewhere in the universe...
pubs.acs.org/doi/abs/10.1021/ol8007099 pubs.acs.org/doi/abs/10.1021/ol8007099