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Spontaneous mirror symmetry breaking in the limited enantioselective autocatalysis model: abyssal hydrotermal vents as scenario for the emergence of chirality in prebiotic chemistry Ribó i Trujillo, Josep M. Crusats i Aliguer, Joaquim El Hachemi, Zoubir Moyano i Baldoire, Albert Blanco, Celia Hochberg, David Exobiologia Macromolècules Biomolècules Cosmologia Quiralitat Exobiology Macromolecules Biomolecules Cosmology Chirality 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 or 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 continuous internal flow. In such conditions, the system can evolve, for certain reaction and system parameters, toward a chiral stationary state; that is, the system is able to reach a bifurcation point leading to SMSB. Numerical simulations in which reasonable chemical parameters have been used suggest that an ade- quate scenario for such a SMSB would be that of abyssal hydrothermal vents, by virtue of the typical temper- ature gradients found there and the role of inorganic solids mediating chemical reactions in an enzyme-like role. Key Words: Homochirality Prebiotic chemistry. 2013-04-26T06:24:28Z 2013-04-26T06:24:28Z 2013 2013-04-26T06:24:28Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1531-1074 https://hdl.handle.net/2445/36348 621733 eng Reproducció del document publicat a: http://dx.doi.org/10.1089/ast.2012.0904 Astrobiology, 2013, vol. 13, num. 02, p. 132-142 http://dx.doi.org/10.1089/ast.2012.0904 (c) Mary Ann Liebert, Inc., 2013 info:eu-repo/semantics/openAccess 11 p. application/pdf Mary Ann Liebert, Inc. Articles publicats en revistes (Química Inorgànica i Orgànica)