Computer Science
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8814604k&link_type=abstract
In its JPRS Report: Science and Technology. USSR: Life Sciences p 15 (SEE N88-14601 06-51) Transl. into ENGLISH from Zhurnal Evo
Computer Science
Lunar Soil, Nucleic Acids, Photolysis, Uracil, Metal Oxides, Molecular Structure, Regolith, Silicon Dioxide, Ultraviolet Radiation
Scientific paper
An assessment was conducted on the effects of lunar soil on photochemical transformation of uridine and uracil in the absence of oxygen, and comparison with the effects obtained with a synthetic analog of lunar soil. Studies with 150 micrometer thick films of uracil and uridine with an exposure surface area of 175 sq cm over the lunar regolite samples collected by the Luna-16 mission from the Sea of Fertility showed enhanced UV photolysis. The quantum yields for uracil photolysis (254 nm, 643,000 J/sq m) with and without the regolite were 0.32/1000 and 0.2/100 respectively. The corresponding figures for uridine with and without the lunar sample were 0.13/1000 and 0.11/1000. A mixture of metal oxides designed to simulate the lunar soil sample was ineffective as a catalyst of photolysis; however, a sample of SiO2 showed limited activity. Spectral and chromatographic analysis of UV-irradiated uracil samples on the lunar soil demonstrated the formation of a more complex but undefined molecular structure.
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