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1 LFP - URA 2453 - Laboratoire Francis PERRIN

Abstract : The formation of thymine dimers in the single-stranded oligonucleotide, dT20, is studied at room temperature by laser flash photolysis using 266 nm excitation. It is shown that the 6-4 adduct is formed within 4 ms via a reactive intermediate. The formation of cyclobutane dimers is faster than 200 ns. The overall quantum yield for the 6-4 formation is 3.7 ± 0.3 × 10-3, and that of the cyclobutane dimers is 2.8 ± 0.2 × 10-2. No triplet absorption is detected, showing that either the intersystem crossing yield decreases by 1 order of magnitude upon oligomerization



Author: Sylvie Marguet - Dimitra Markovitsi -

Source: https://hal.archives-ouvertes.fr/



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