| Autor: |
Ribó, Josep M., Crusats, Joaquim, El-Hachemi, Zoubir, Moyano, Albert, Blanco, Celia, Hochberg, David |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Astrobiology, Volume 13, Number 2, 2013 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1089/ast.2012.0904 |
| Popis: |
The emergence of chirality in enantioselective autocatalysis for compounds unable to transform according to the Frank-like reaction network is discussed with respect to the controversial limited enantioselectivity (LES) model composed of coupled enantioselective and non-enantioselective autocatalyses. The LES model cannot lead to spontaneous mirror symmetry breaking (SMSB) either in closed systems with a homogeneous temperature distribution nor in closed systems with a stationary non-uniform temperature distribution. However, simulations of chemical kinetics in a two-compartment model demonstrate that SMSB may occur if both autocatalytic reactions are spatially separated at different temperatures in different compartments but coupled under the action of a continous internal flow. In such conditions the system can evolve, for certain reaction and system parameters, towards a chiral stationary state, i.e., the system is able to reach a bifurcation point leading to SMSB. Numerical simulations using reasonable chemical parameters suggest that an adequate scenario for such a SMSB would be that of abyssal hydrothermal vents, by virtue of the typical temperature gradients found there and the role of inorganic solids mediating chemical reactions in an enzyme-like role. |
| Databáze: |
arXiv |
| Externí odkaz: |
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