Living structures may be described as beings in a self-organizing, fluctuating steady-state far from equilibrium: concepts arisen from the physics of chaos. The new model of living systems permits some considerations on the probability of the spontaneous creation of a biosphere. Even if it's not possible, at present, to know the way(s) from which life born, and plausible pathways of prebiotic evolution remain obscure, it's possible to consider the emerging of life as the transition from disorder to order in a population of mutually catalytic molecules undergoing random mutations (Dyson, 1982). Here we present data concerning the fractal structure of the oldest information polymers (tRNA of Archaea and viroid nucleotide sequences). Our data show high values of fractal dimension, placing these ancient polymers very close to the border between order and disorder. These data may be explained with the model presented by Dyson. The Dyson model, as well the thermodynamic considerations by Svirezhev (1999), gave the probability of emerging of a biosphere close to one, if we have enough time to produce sufficiently large number of attempts.

Bianciardi, G. (2001). Origin(s) of life in the primitive Earth and Chaos Science. Probability of spontaneous emergenging of a biosphere. In First European Workshop Exo-/Astro-Biology (pp. 303-304). Noordwijck (PAESI BASSI) : European Space Agency ESTEC, SP-593.

Origin(s) of life in the primitive Earth and Chaos Science. Probability of spontaneous emergenging of a biosphere

BIANCIARDI, GIORGIO
2001

Abstract

Living structures may be described as beings in a self-organizing, fluctuating steady-state far from equilibrium: concepts arisen from the physics of chaos. The new model of living systems permits some considerations on the probability of the spontaneous creation of a biosphere. Even if it's not possible, at present, to know the way(s) from which life born, and plausible pathways of prebiotic evolution remain obscure, it's possible to consider the emerging of life as the transition from disorder to order in a population of mutually catalytic molecules undergoing random mutations (Dyson, 1982). Here we present data concerning the fractal structure of the oldest information polymers (tRNA of Archaea and viroid nucleotide sequences). Our data show high values of fractal dimension, placing these ancient polymers very close to the border between order and disorder. These data may be explained with the model presented by Dyson. The Dyson model, as well the thermodynamic considerations by Svirezhev (1999), gave the probability of emerging of a biosphere close to one, if we have enough time to produce sufficiently large number of attempts.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/32509
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