Results 141 to 150 of about 19,936 (198)

Models of Prebiotic Evolution

Biology Bulletin Reviews, 2021
The models of prebiotic evolution studied by the author are characterized: (1) the quasispecies model, (2) the hypercycle model, and (3) the syser model. The quasispecies model was proposed by Manfred Eigen. This model describes the evolution of a population of RNA macromolecules that can encode hereditary information.
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Prebiotic network evolution: six key parameters

Molecular BioSystems, 2015
Akin to biological networks, prebiotic chemical networks can evolve and we have identified six key parameters that govern their evolution.
Philippe, Nghe, Wim, Hordijk, Stuart A, Kauffman, Sara I, Walker, Francis J, Schmidt, Harry, Kemble, Jessica A M, Yeates, Niles, Lehman   +7 more
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Prebiotic evolution: Conformational perspectives

Journal of Theoretical Biology, 1982
Abstract Current models of prebiotic evolution are based on the chemical properties of proteins and nucleic acids. Even if it is conceded that these polymers can be synthesized abiotically, it is conceptually difficult to construct a link between them which would serve as a primordial model from which the present day genome could have evolved.
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Hydrated electrons and prebiotic evolution

Journal of Theoretical Biology, 1979
Abstract It is proposed that reactions of the hydrated electron eaq− in the “primordial soup” were an evolutionary pressure which selected biopolyelectrolytes, coacervates, “organelles” and lipid-membrane-bound structures of a pattern found in the biosphere today.
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Prebiotic Chemical Evolution

2013
Whereas 'natural evolution' is a well-studied biological theory, the notion of 'chemical evolution' remains ambiguous. At least two major meanings of 'chemical evolution' can be found. As used by cosmologists, planetologists or geochemists among others, chemical evolution - call it chemical evolution1 - refers to the changes in chemical composition of ...
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Prebiotic Chemical Evolution in the Astrophysical Context

Origins of Life and Evolution of Biospheres, 2015
An ever increasing amount of molecular material is being discovered in the interstellar medium, associated with the birth and death of stars and planetary systems. Radio and millimeter-wave astronomical observations, made possible by high-resolution laboratory spectroscopy, uniquely trace the history of gas-phase molecules with biogenic elements. Using
L M, Ziurys, G R, Adande, J L, Edwards, D R, Schmidt, D T, Halfen, N J, Woolf   +5 more
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The evolution of the prebiotic atmosphere

Origins of Life, 1984
One-dimensional radiative convective and photochemical models are used to estimate the vertical temperature structure and composition of the earth's prebiotic atmosphere. Greatly enhanced CO2 levels (100-1000 times present) are required to keep the mean surface temperature above freezing in the face of decreased solar luminosity during the earth's ...
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Network Theory in Prebiotic Evolution

2018
One of the most challenging aspect of origins of life research is that we do not know precisely what life is. In recent years, the use of network theory has revolutionized our understanding of living systems by permitting a mathematical framework for understanding life as an emergent, collective property of many interacting entities.
Sara Imari Walker, Cole Mathis
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Photoactivated matrices in prebiotic evolution processes

High Energy Chemistry, 2010
The processes of abiogenesis of biologically important compounds (amino acids, peptides, pyruvic acid, etc.) under the conditions of adsorption in mineral (titanium dioxide, silica gel) or organic (melanoidin) matrices in the presence of UV radiation were studied.
T. A. Telegina, M. P. Kolesnikov, Yu. L. Vechtomova   +2 more
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