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. 2014 Feb 1;14(2):119–131. doi: 10.1089/ast.2013.1093

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Copyright 2014, Mary Ann Liebert, Inc.

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FIG. 4. — (a) HPLC chromatograms (λ=256 nm) of the three residues produced from the UV/EUV irradiations of H₂O:pyrimidine ice mixtures with the 0^th order beam light (top trace, irradiation time: 20 h), the He i line (top middle trace, 32 h), and the He ii line (bottom middle trace, 32 h). The bottom trace corresponds to an H₂O:pyrimidine=10:1 ice mixture deposited on the substrate for 25 h but not photo-irradiated. (b) Enlargement of the chromatograms for the three residues to the range in which most peaks are eluting. The main identified photo-products are uracil (1) and 4(3H)-pyrimidone (2).