Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays
| Autor(a) principal: | |
|---|---|
| Data de Publicação: | 2011 |
| Outros Autores: | , , , , , , , , , |
| Tipo de documento: | Artigo |
| Idioma: | eng |
| Título da fonte: | Repositório Institucional da UFBA |
| Texto Completo: | http://www.repositorio.ufba.br/ri/handle/ri/5511 |
Resumo: | texto completo: acesso restrito. p.2214–2222. |
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Cavasso Filho, Reinaldo LuizOliveira, Sergio Pilling Guapyassu deAndrade, Diana Paula de PinhoNascimento, E. M.Marinho, Ricardo dos Reis TeixeiraBoechat-Roberty, Heloisa MariaCoutinho, Lúcia HelenaSouza, Gerardo Gerson Bezerra deCastilho, Roberto Barbosa deLago, Alexsandre FigueiredoBrito, Arnaldo Naves deCavasso Filho, Reinaldo LuizOliveira, Sergio Pilling Guapyassu deAndrade, Diana Paula de PinhoNascimento, E. M.Marinho, Ricardo dos Reis TeixeiraBoechat-Roberty, Heloisa MariaCoutinho, Lúcia HelenaSouza, Gerardo Gerson Bezerra deCastilho, Roberto Barbosa deLago, Alexsandre FigueiredoBrito, Arnaldo Naves de2012-03-05T18:50:02Z20111365-2966http://www.repositorio.ufba.br/ri/handle/ri/5511v. 411.texto completo: acesso restrito. p.2214–2222.An experimental photochemistry study involving gas- and solid-phase amino acids (glycine, DL-valine, DL-proline) and nucleobases (adenine and uracil) under soft X-rayswas performed. The aim was to test the molecular stabilities of essential biomolecules against ionizing photon fields inside dense molecular clouds and protostellar discs analogs. In these environments, the main energy sources are the cosmic rays and soft X-rays. The measurements were taken at the Brazilian Synchrotron Light Laboratory (LNLS), employing 150-eV photons. In situ sample analysis was performed by time-of-flight mass spectrometer (TOF-MS) and Fourier transform infrared (FTIR) spectrometer, for gas- and solid-phase analysis, respectively. The half-life of solid-phase amino acids, assumed to be present at grain mantles, is at least 3 × 105 and 3 × 108 yr inside dense molecular clouds and protoplanetary discs, respectively. We estimate that for gas-phase compounds these values increase 1 order of magnitude since the dissociation cross-section of glycine is lower in gas phase than in solid phase for the same photon energy. The half-life of solid-phase nucleobases is about 2–3 orders of magnitude longer than found for amino acids. The results indicate that nucleobases are much more resistant to ionizing radiation than amino acids. We consider these implications for the survival and transfer of biomolecules in space environments.Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2012-03-05T18:50:02Z No. of bitstreams: 1 j.1365-2966.2010.17840.x.pdf: 10460906 bytes, checksum: 2aeb40d6e0ab161ff9e926bb08e9c9c5 (MD5)Made available in DSpace on 2012-03-05T18:50:02Z (GMT). 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| dc.title.pt_BR.fl_str_mv |
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays |
| dc.title.alternative.pt_BR.fl_str_mv |
Monthly Notices of the Royal Astronomical Society |
| title |
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays |
| spellingShingle |
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays Cavasso Filho, Reinaldo Luiz astrobiology astrochemistry molecular data methods: laboratory ISM: molecules X-rays: ISM |
| title_short |
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays |
| title_full |
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays |
| title_fullStr |
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays |
| title_full_unstemmed |
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays |
| title_sort |
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays |
| author |
Cavasso Filho, Reinaldo Luiz |
| author_facet |
Cavasso Filho, Reinaldo Luiz Oliveira, Sergio Pilling Guapyassu de Andrade, Diana Paula de Pinho Nascimento, E. M. Marinho, Ricardo dos Reis Teixeira Boechat-Roberty, Heloisa Maria Coutinho, Lúcia Helena Souza, Gerardo Gerson Bezerra de Castilho, Roberto Barbosa de Lago, Alexsandre Figueiredo Brito, Arnaldo Naves de |
| author_role |
author |
| author2 |
Oliveira, Sergio Pilling Guapyassu de Andrade, Diana Paula de Pinho Nascimento, E. M. Marinho, Ricardo dos Reis Teixeira Boechat-Roberty, Heloisa Maria Coutinho, Lúcia Helena Souza, Gerardo Gerson Bezerra de Castilho, Roberto Barbosa de Lago, Alexsandre Figueiredo Brito, Arnaldo Naves de |
| author2_role |
author author author author author author author author author author |
| dc.contributor.author.fl_str_mv |
Cavasso Filho, Reinaldo Luiz Oliveira, Sergio Pilling Guapyassu de Andrade, Diana Paula de Pinho Nascimento, E. M. Marinho, Ricardo dos Reis Teixeira Boechat-Roberty, Heloisa Maria Coutinho, Lúcia Helena Souza, Gerardo Gerson Bezerra de Castilho, Roberto Barbosa de Lago, Alexsandre Figueiredo Brito, Arnaldo Naves de Cavasso Filho, Reinaldo Luiz Oliveira, Sergio Pilling Guapyassu de Andrade, Diana Paula de Pinho Nascimento, E. M. Marinho, Ricardo dos Reis Teixeira Boechat-Roberty, Heloisa Maria Coutinho, Lúcia Helena Souza, Gerardo Gerson Bezerra de Castilho, Roberto Barbosa de Lago, Alexsandre Figueiredo Brito, Arnaldo Naves de |
| dc.subject.por.fl_str_mv |
astrobiology astrochemistry molecular data methods: laboratory ISM: molecules X-rays: ISM |
| topic |
astrobiology astrochemistry molecular data methods: laboratory ISM: molecules X-rays: ISM |
| description |
texto completo: acesso restrito. p.2214–2222. |
| publishDate |
2011 |
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2011 |
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2012-03-05T18:50:02Z |
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1365-2966 |
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v. 411. |
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1365-2966 v. 411. |
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