title: A Model of Isotope Separation in Cells at the Early Stages of Evolution.
abstract: 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.
authors: Ural Federal University, Mita str. 19, Yekaterinburg, Russia. melkikh2008@rambler.ru.
authors: A V
authors: AV
authors: Melkikh
authors: Ural Federal University, Mita str. 19, Yekaterinburg, Russia.
authors: A O
authors: AO
authors: Bokunyaeva
mesh_terms: D005075:Biological Evolution; D001692:Biological Transport; D002462:Cell Membrane / Q000378:metabolism*; D007477:Ions / Q000378:metabolism; D007554:Isotopes / Q000378:metabolism*; D008954:Models, Biological
chemical_list: D007477:Ions; D007554:Isotopes
keywords: Chemical potentials difference; Early stages of evolution; Efficiency of active transport; Protocells