Chirality bifurcation

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chir.jpg
Fig 3 : (a) The perturbing effect of the neutral weak force results in violation of chiral symmetry in electron orbits. Without perturbation (i) the orbits are non-chiral, but the action of Zo results in a perturbing chiral rotation. (b) Autocatalytic symmetry-breaking causes random chiral bifurcation (i). Weak perturbation results in only one chiral form (iii) (King).

Although the electromagnetic force has chiral symmetry, the electron also interacts via the neutral weak force when close to the nucleus. This causes a perturbation to the electronic orbit causing it to become selectively chiral, fig 3(a) (Bouchiat & Pottier 1984, Hegstrom & Kondputi 1990). In a polymeric system with competing D and L variants, in which there is negative feedback between the two chiral forms of polymerization, making the system unstable, the chiral weak force provides a symmetry-breaking perturbation. In a simulation, fig 3(bi) high [S][T] causes autocatalytic bifurcation of system (ii), resulting in random symmetry-breaking into products D or L. Chiral weak perturbation (iii) results in one form only. The selection of D-nucleotides could have resulted in L-amino acids by a stereochemical association (Lacey et. al. 1988).

Retrieved by DonEMitchell 12:32, 31 December 2012 (MST) from Genesis of Eden, biocosmology by Dhushara http://www.dhushara.com/book/biocos/symevol.htm