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1.
Tsitologiia ; 51(3): 240-6, 2009.
Artigo em Russo | MEDLINE | ID: mdl-19435278

RESUMO

The possibility of prebiotic synthesis of nucleic acids components (nucleotides) has been demonstrated under condition of the space orbital stations and satellites under effect of all space radiation spectra. Since a lot of different nucleic acids components are known to be present within small space bodies, we have to investigate their chemical complication in respect with such components as nucleotides. The goal of this work is to review our results in the field of prebiotic synthesis of purine and pyrimidine nucleotides on the board of Russian space crafts. The increase in the solid reaction mixtures exposure time leads to degradation of both initial components (nucleosides) and the reaction products (nucleotides). The dominating role of heat energy in the abiogenic reactions has been revealed in laboratory (ground) experiments. Similar set of natural nucleotides has been synthesized under effect of different open space energy sources in both flight and ground experiments. The formation of 5'-nucleotides is a dominating process. All the data are discussed in the context of exobiological investigations on the Earth's orbit.


Assuntos
Exobiologia , Meio Ambiente Extraterreno , Nucleotídeos de Purina/síntese química , Nucleotídeos de Purina/efeitos da radiação , Nucleotídeos de Pirimidina/síntese química , Nucleotídeos de Pirimidina/efeitos da radiação , Raios gama , Astronave , Raios Ultravioleta
3.
Adv Space Res ; 19(7): 1059-62, 1997.
Artigo em Inglês | MEDLINE | ID: mdl-11541333

RESUMO

The abiogenic synthesis of pyrimidine nucleotides in solid state has been investigated. Our experiment indicates that natural nucleotides are produced in thin films prepared from nucleoside and inorganic phosphate by irradiating with vacuum ultraviolet light (VUV, lambda=100-200 nm). We have investigated the influence of the type of nucleic acids base (thymidine, cytosine, uracil) and the structure of sugar moiety (ribose or deoxyribose) on the course and yield of reaction. We compared the action of vacuum ultraviolet light with action of gamma-radiation, heat and biology significant UV (254 nm) which have been investigated earlier. The occurrence of these reaction in open space is discussed.


Assuntos
Citidina/efeitos da radiação , Evolução Química , Nucleotídeos de Pirimidina/síntese química , Timidina/efeitos da radiação , Raios Ultravioleta , Citidina/química , Fosfatos de Dinucleosídeos/química , Fosfatos de Dinucleosídeos/efeitos da radiação , Meio Ambiente Extraterreno , Nucleosídeos/química , Nucleosídeos/efeitos da radiação , Fosforilação , Fotoquímica , Timidina/química , Vácuo
4.
Adv Space Res ; 19(7): 1063-6, 1997.
Artigo em Inglês | MEDLINE | ID: mdl-11541334

RESUMO

The present experiment indicates that oligopeptides are easily produced in solid state from mixtures of simple amino acids by irradiating with high energy charged particles. We investigated such amino acids and their mixtures as tryptophan, tyrosine and glycine. The thin films was irradiated with protons (6.6 MeV). Such dipeptides as Trp-Trp, Gly-Tyr, Tyr-Gly, and Tyr-Tyr have been detected as products of irradiation. Cosmic rays might be an effective energy source for abiotic formation of bioorganic compounds on the surface of small bodies in the solar system on early stage of formation of planets as well as at present day.


Assuntos
Radiação Cósmica , Evolução Química , Oligopeptídeos/síntese química , Sistema Solar , Aminoácidos/química , Aminoácidos/efeitos da radiação , Ciclotrons , Glicina/efeitos da radiação , Prótons , Triptofano/efeitos da radiação , Tirosina/efeitos da radiação
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