Melkikh A V, Bokunyaeva A O
Ural Federal University, Mita str. 19, Yekaterinburg, Russia.
Orig Life Evol Biosph. 2016 Mar;46(1):95-104. doi: 10.1007/s11084-015-9463-0. Epub 2015 Aug 28.
The separation of the isotopes of certain ions can serve as an important criterion for the presence of life in the early stages of its evolution. A model of the separation of isotopes during their transport through the cell membrane is constructed. The dependence of the selection coefficient on various parameters is found. In particular, it is shown that the maximum efficiency of the transport of ions corresponds to the minimum enrichment coefficient. At the maximum enrichment, the efficiency of the transport system approaches ½. Calculated enrichment coefficients are compared with experimentally obtained values for different types of cells, and the comparison shows a qualitative agreement between these quantities.
某些离子同位素的分离可作为生命进化早期阶段存在生命的重要标准。构建了同位素在穿过细胞膜运输过程中的分离模型。发现了选择系数对各种参数的依赖性。特别地，结果表明离子运输的最大效率对应于最小富集系数。在最大富集时，运输系统的效率接近1/2。将计算得到的富集系数与不同类型细胞的实验值进行比较，比较结果表明这些量之间存在定性的一致性。
