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- W2172402518 abstract "The impact of low-energy (1-30 eV) electrons on self-assembled monolayers of heterogeneous oligonucleotides chemisorbed on a gold surface has been investigated by mass spectrometry of desorbed neutral species in an attempt to understand the consequences of secondary electron damage in a short sequence of a DNA single strand. We demonstrate that the most intense observable neutral species (CN, OCN and/or H(2)NCN) desorbed from Cy(6)-Th(3) and Cy(6)-(BrdU)(3) oligos are related to primary fragmentation of the bases induced by electron impact. The dependence of the neutral species desorption on electron energy shows typical signatures of dissociative electron attachment initiated by the formation of shape- and core-excited resonances (i.e. single-electron and two-electron- one-hole transitory anions, respectively). Substitution of dTh by BrdU increases the production of neutral fragments by as much as a factor of about 3 for the entire electron energy range. When the distribution of secondary electrons along radiation tracks in H(2)O is taken into account, we show that the probability for electron damage to heterogeneous oligonucleotides is enhanced by a factor of 2.5-3 for electron energies below 20 eV for both sensitized and unsensitized strands." @default.
- W2172402518 created "2016-06-24" @default.
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- W2172402518 date "2000-01-01" @default.
- W2172402518 modified "2023-09-25" @default.
- W2172402518 title "Damage Induced by 1–30 eV Electrons on Thymine- and Bromouracil-Substituted Oligonucleotides" @default.
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- W2172402518 doi "https://doi.org/10.1667/0033-7587(2000)153[0023:dibeeo]2.0.co;2" @default.
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