Photo-irradiation of Pyrimidine in Interstellar Ice Analogs: Searching for Nucleobases
نویسندگان
چکیده
NUCLEOBASES. S. N. Milam, M. Nuevo, S. A. Sandford, J. E. Elsila, and J. P. Dworkin, NASA Ames Research Center, M/S 245-6, Moffett Field, CA 94035, [email protected], [email protected], [email protected], SETI Institute, 515 N. Whisman Rd., Mountain View, CA 94043, NASA Goddard Space Flight Center, M/S 691.0, Greenbelt, MD 20771, [email protected], [email protected]
منابع مشابه
Thymine and other prebiotic molecules produced from the ultraviolet photo-irradiation of pyrimidine in simple astrophysical ice analogs.
The informational subunits of RNA or DNA consist of substituted N-heterocyclic compounds that fall into two groups: those based on purine (C₅H₄N₄) (adenine and guanine) and those based on pyrimidine (C₄H₄N₂) (uracil, cytosine, and thymine). Although not yet detected in the interstellar medium, N-heterocycles, including the nucleobase uracil, have been reported in carbonaceous chondrites. Recent...
متن کاملNucleobases and prebiotic molecules in organic residues produced from the ultraviolet photo-irradiation of pyrimidine in NH(3) and H(2)O+NH(3) ices.
Although not yet identified in the interstellar medium (ISM), N-heterocycles including nucleobases-the information subunits of DNA and RNA-are present in carbonaceous chondrites, which indicates that molecules of biological interest can be formed in non-terrestrial environments via abiotic pathways. Recent laboratory experiments and ab initio calculations have already shown that the irradiation...
متن کاملFormation of uracil from the ultraviolet photo-irradiation of pyrimidine in pure H2O ices.
The detection of nucleobases in carbonaceous chondrites such as Murchison supports the scenario in which extraterrestrial organic molecules could have contributed to the origin of life on Earth. However, such large molecules have not been observed to date in astrophysical environments, in particular, comets and the interstellar medium (ISM). The physico-chemical conditions under which nucleobas...
متن کاملNew insight into the formation of hexamethylenetetramine (HMT) in interstellar and cometary ice analogs
Aims. We investigate the purely thermal formation of hexamethylenetetramine (HMT, C6H12N4) in interstellar ice analogs from nonphotolysed ice and compare our results with those for the formation from photolysed ice. Methods. We use Fourier transform-infrared spectroscopy to follow residue formation from VUV irradiation of H2CO:NH3 ice mixture in different concentration ratios. We also report th...
متن کاملPhotosynthesis and photo-stability of nucleic acids in prebiotic extraterrestrial environments.
Laboratory experiments have shown that the UV photo-irradiation of low-temperature ices of astrophysical interest leads to the formation of organic molecules, including molecules important for biology such as amino acids, quinones, and amphiphiles. When pyrimidine is introduced into these ices, the products of irradiation include the nucleobases uracil, cytosine, and thymine, the informational ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2009