Michaelian Karo
Department of Nuclear Physics and Applications of Radiation, Instituto de Física, Universidad Nacional Autónoma de México, Circuito Interior de la Investigación Científica, Cuidad Universitaria, Mexico City C.P. 04510, Mexico.
Entropy (Basel). 2021 Feb 10;23(2):217. doi: 10.3390/e23020217.
The non-equilibrium thermodynamics and the photochemical reaction mechanisms are described which may have been involved in the dissipative structuring, proliferation and complexation of the fundamental molecules of life from simpler and more common precursors under the UVC photon flux prevalent at the Earth's surface at the origin of life. Dissipative structuring of the fundamental molecules is evidenced by their strong and broad wavelength absorption bands in the UVC and rapid radiationless deexcitation. Proliferation arises from the auto- and cross-catalytic nature of the intermediate products. Inherent non-linearity gives rise to numerous stationary states permitting the system to evolve, on amplification of a fluctuation, towards concentration profiles providing generally greater photon dissipation through a thermodynamic selection of dissipative efficacy. An example is given of photochemical dissipative abiogenesis of adenine from the precursor HCN in water solvent within a fatty acid vesicle floating on a hot ocean surface and driven far from equilibrium by the incident UVC light. The kinetic equations for the photochemical reactions with diffusion are resolved under different environmental conditions and the results analyzed within the framework of non-linear Classical Irreversible Thermodynamic theory.
描述了非平衡热力学和光化学反应机制，这些机制可能参与了在生命起源时地球表面普遍存在的紫外线光子通量下，从更简单、更常见的前体物质中形成生命基本分子的耗散结构、增殖和络合过程。基本分子的耗散结构通过它们在紫外线波段强烈且宽泛的波长吸收带以及快速的无辐射去激发得以证明。增殖源于中间产物的自催化和交叉催化性质。固有的非线性导致众多稳态的出现，使得系统在涨落放大时能够朝着浓度分布演化，通过对耗散效率的热力学选择，通常能实现更大的光子耗散。给出了一个例子，即在漂浮于热海洋表面的脂肪酸囊泡内的水溶剂中，前体物质HCN通过光化学耗散过程生成腺嘌呤，该过程由入射的紫外线光驱动，远离平衡态。求解了不同环境条件下光化学反应与扩散的动力学方程，并在非线性经典不可逆热力学理论框架内对结果进行了分析。
