微可逆循环化学系统。对“重新考察同手性自发出现反应模型的可逆性”一文的评论
Microreversible recycled chemical systems. Comment on "A Re-Examination of Reversibility in Reaction Models for the Spontaneous Emergence of Homochirality"
摘要：
在生命起源前的地球上同手性的开始问题仍然是寻求生命起源的一个基本问题。最近在这一领域的工作引入了回收的概念，而不是弗兰克所描述的传统的开放流系统。这种方法受到Blackmond等人的批评，他们声称这种系统在化学上是不可能的，除非在引入非微可逆反应的情况下，如在光化学反应中，或在物理作用的影响下（例如通过晶体破碎）。这种观点揭示了对这种循环系统模型的误解，忽视了在益生元系统中可能发生的能量交换的可能性，并导致作者无意中从他们的“非平衡”模型中删除了活化反应和能量来源。特别重要的是要理解什么是概念背后的概念循环系统，和活化反应。这些观点对于理解化学系统-特别是生物前化学系统-如何保持在非平衡稳定状态，以及自由能如何在系统之间使用和交换是至关重要的。所提出的方法旨在分解的问题，避免拥抱整个系统在同一时间。
英文摘要：
The question of the onset of the homochirality on prebiotic Earth still remains a fundamental question in the quest for the origin of life. Recent works in this field introduce the concept of recycling, rather than the traditional open-flow system described by Frank. This approach has been criticized by Blackmond et al. They claimed that such systems are thermodynamically impossible, except in the cases where non-microreversible reactions are introduced, like in photochemical reactions, or under the influence of physical actions (e.g. by crystal crushing). This point of view reveals misunderstandings about this model of a recycled system, overlooks the possibility of energy exchanges that could take place in prebiotic systems, and leads the authors to unawarely remove the activation reaction and energy source from their "non-equilibrium" models. It is especially important to understand what are the concepts behind the notion of recycled systems, and of activation reactions. These points are fundamental to comprehending how chemical systems -- and especially prebiotic chemical systems -- can be maintained in non-equilibrium steady states, and how free energy can be used and exchanged between systems. The proposed approach aims at the decomposition of the problem, avoiding to embrace the whole system at the same time.
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