Biogenesis by cometary grains — Thermodynamic aspects of self-organization

Details Biogenesis by cometary grains — Thermodynamic aspects of self-organization Biogenesis by cometary grains — Thermodynamic aspects of self-organization

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989oleb...19...87k&link_type=abstract

Origins of Life and Evolution of the Biosphere, Volume 19, Issue 2, pp.87-93

Mathematics

Probability

14

Scientific paper

From our analysis of composition and structure of cometary grains some thermodynamic aspects concerning biogenesis arose. Assuming any kind of hypercyclic organization as first step having come into existence spontaneously, some prerequisites are necessary from thermodynamics of irreversible processes, e.g.: large concentration gradients of certain substances and high affinities of their reactions catalyzed at surfaces, small semipermeable compartments due to the related diffusion coefficients, large reservoirs of substrates and for products. Neither an isothermal dilute-soup nor a cometary pond scenario can probably meet these requirements. However, cometary grains as found in p/Halley added to an aqueous solution of nutrient organics on earth may fulfill the requirements of chemical thermodynamics (two types of matter on very different chemical potential at the same place and time) to start molecular self-organization. As the probability of partwise survival of cometary matter during atmospheric entry is regarded not to be low, if sufficiently deep lakes or an ocean collect the cometary pieces, this combined space- and earth-borne scenario could provide a model of origin of life which may overcome problems of previous ones.

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