Results 151 to 160 of about 19,936 (198)

The non-canonical nucleotides and prebiotic evolution

BioSystems
The mystery of the origin of life has been puzzling mankind for several millenia. Starting from the second half of the 20th century, when the crucial role of nucleic acids in biological heredity became apparent, the emphasis in the field has shifted to the explanation of the origin of nucleic acids and the mechanisms of copying of macromolecules.
Alexey S, Ruzov, Alexander S, Ermakov
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On dating stages in prebiotic chemical evolution

Naturwissenschaften, 2012
The notion that RNA must have had a unique and decisive role in the development of life needs hardly be questioned. However, the chemical complexity and other properties of RNA, such as high solubility in water and vulnerability to degradation, make it improbable that RNA could have had an early presence in the development of life on Earth or on any ...
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Computer simulations of prebiotic evolution.

Pacific Symposium on Biocomputing. Pacific Symposium on Biocomputing, 1998
This paper is a review of our previous work on the field of possible ways of prebiotic evolution. We propose an algorithm providing sequences of model proteins with rapid folding into a given native conformation. Thermodynamical analysis shows that the increase in speed is matched by an increase in stability: the evolved sequences are much more stable ...
V I, Abkevich, A M, Gutin, E I, Shakhnovich   +2 more
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Spatial Models of Prebiotic Evolution: Soup Before Pizza?

Origins of life and evolution of the biosphere, 2003
The problem of information integration and resistance to the invasion of parasitic mutants in prebiotic replicator systems is a notorious issue of research on the origin of life. Almost all theoretical studies published so far have demonstrated that some kind of spatial structure is indispensable for the persistence and/or the parasite resistance of ...
Scheuring, I., Czárán, T., Szabo, P., Károlyi, G., Toroczkai, Z.   +4 more
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Cooptive Evolution of Prebiotic Chemical Networks

2012
A mechanism of Darwinian chemical evolution is proposed based on cooptation of chemical avalanches occurring in a catalytic network of molecules enclosed in protocell compartments. This intermediate stage of information transmission would have been of importance prior to template replication and may be necessary to explain the origin of highly complex ...
Chrisantha Fernando, Vera Vasas
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Chemical Evolution on Titan: Comparisons to the Prebiotic Earth

Origins of life and evolution of the biosphere, 1997
Models for the origin of Titan's atmosphere, the processing of the atmosphere and surface and its exobiological role are reviewed. Titan has gained widespread acceptance in the origin of life field as a model for the types of evolutionary processes that could have occurred on prebiotic Earth. Both Titan and Earth possess significant atmospheres (> or =
D W, Clarke, J P, Ferris
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From chemical to prebiotic evolution

2001
We have seen in Chapter 1 that the biogenic elements were formed in stellar cores and later were expelled by the host star through stellar explosions l and other processes. Subsequently, they combine in the atmospheres of evolved stars to form diatomic and triatomic molecules that are to have transcendental consequences in the subsequent stages of ...
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Prebiotic chemical evolution: a meteoritic perspective

Rendiconti Lincei, 2011
Carbonaceous chondrite meteorites are primitive asteroidal fragments that contain organic carbon and offer a glimpse of the a-biotic chemical processes that preceded the onset of terrestrial life. Their organic materials display structures as diverse as kerogen-like macromolecules and simpler soluble compounds with identical counterparts in Earth’s ...
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Irreversible Prebiotic Evolution in Hydrothermal Systems

2017
The author substantiates thermodynamically irreversible prebiotic evolution of organic matter in fluid migrating from the bowels of hydrothermal systems to the surface. This medium is characterized by the combination of two principal peculiarities: general tendency to temperature and pressure descent (1), and multilevel oscillations of temperature and ...
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Prebiotic Evolution and Self-Assembly of Nucleic Acids

ACS Nano, 2018
Prebiotic evolution is the stage that is assumed to have taken place prior to the emergence of the first living entities, during which time the abiotic synthesis of monomers, oligomers, and supramolecular systems that led to the hypothesized RNA world occurred.
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