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Formation of nucleobases from the uv irradiation of pyrimidine in astrophysical ice analogs
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Nuevo, Michel Sandford, Scott A. Materese, Christopher K. |
| Copyright Year | 2014 |
| Description | Nucleobases are the informational subunits of DNA and RNA. They consist of Nheterocycles that belong to either the pyrimidine-base group (uracil, cytosine, and thymine) or the purinebase group (adenine and guanine). Several nucleobases, mostly purine bases, have been detected in meteorites [1-3], with isotopic signatures consistent with an extraterrestrial origin [4]. Uracil is the only pyrimidine-base compound formally reported in meteorites [2], though the presence of cytosine cannot be ruled out [5,6]. However, the actual process by which the uracil was made and the reasons for the non-detection of thymine in meteorites have yet to be fully explained. Although no N-heterocycles have ever been observed in the ISM [7,8], the positions of the 6.2-μm interstellar emission features suggest a population of such molecules is likely to be present [9]. In this work we study the formation of pyrimidine-based molecules, including the three nucleobases uracil, cytosine, and thymine from the ultraviolet (UV) irradiation of pyrimidine in ices consisting of several combinations of H(sub2)O, NH(sub3), CH(sub3)OH, and CH(sub4) at low temperature, in order to simulate the astrophysical conditions under which prebiotic species may be formed in the interstellar medium, in the protosolar nebula, and on icy bodies of the Solar System. |
| File Size | 60343 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140006936 |
| Archival Resource Key | ark:/13960/t6xw9dv5s |
| Language | English |
| Publisher Date | 2014-03-17 |
| Access Restriction | Open |
| Subject Keyword | Uv Irradiation Ice Irradiation Extraterrestrial Abiotic Nucleobase Synthesis Nucleobases Astrochemistry Astrophysics Thymine Ice Molecules Ultraviolet Radiation Pyrimidines Meteorites Ribonucleic Acids Deoxyribonucleic Acid Irradiation Uracil Isotopic Labeling Low Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
