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Title:
Homochirality and the Need for Energy
Authors:
Plasson, Raphaël; Brandenburg, Axel
Affiliation:
AA(Nordita), AB(Nordita; Department of Astronomy, Stockholm University)
Publication:
Origins of Life and Evolution of Biospheres, Volume 40, Issue 1, pp.93-110 (OLEB Homepage)
Publication Date:
02/2010
Origin:
SPRINGER
Keywords:
Emergence of homochirality, Energy, Entropy, Non-equilibrium thermodynamics, System chemistry, Symmetry breaking
Abstract Copyright:
(c) 2010: Springer Science+Business Media B.V.
DOI:
10.1007/s11084-009-9181-6
Bibliographic Code:
2010OLEB...40...93P

Abstract

The mechanisms for explaining how a stable asymmetric chemical system can be formed from a symmetric chemical system, in the absence of any asymmetric influence other than statistical fluctuations, have been developed during the last decades, focusing on the non-linear kinetic aspects. Besides the absolute necessity of self-amplification processes, the importance of energetic aspects is often underestimated. Going down to the most fundamental aspects, the distinction between a single object—that can be intrinsically asymmetric—and a collection of objects—whose racemic state is the more stable one—must be emphasized. A system of strongly interacting objects can be described as one single object retaining its individuality and a single asymmetry; weakly or non-interacting objects keep their own individuality, and are prone to racemize towards the equilibrium state. In the presence of energy fluxes, systems can be maintained in an asymmetric non-equilibrium steady-state. Such dynamical systems can retain their asymmetry for times longer than their racemization time.
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