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- W2079800229 abstract "We have obtained low frequency (less than 200 cm-1) Raman spectra of calf-thymus DNA and poly(rI).poly(rC) as a function of water content and counterion species and of d(GGTATACC)2 and d(CGCGAATTCGCG)2 crystals. We have found that the Raman scattering from water in the first and second hydration shells does not contribute directly to the Raman spectra of DNA. We have determined the number of strong Raman active modes by comparing spectra for different sample orientations and polarizations and by obtaining fits to the spectra. We have found at least five Raman active modes in the spectra of A- and B-DNA. The frequencies of the modes above 40 cm-1 do not vary with counterion species, and there are only relatively small changes upon hydration. These modes are, therefore, almost completely internal. The mode near 34 cm-1 in A-DNA is mostly internal, whereas the mode near 25 cm-1 is dominated by interhelical interactions. The observed intensity changes upon dehydration were found to be due to the decrease in interhelical distance. Polymer length appears to play a role in the lowest frequency modes." @default.
- W2079800229 created "2016-06-24" @default.
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- W2079800229 date "1990-08-01" @default.
- W2079800229 modified "2023-09-23" @default.
- W2079800229 title "A Raman Study of Low Frequency Intrahelical Modes in A-, B-, and C-DNA" @default.
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- W2079800229 doi "https://doi.org/10.1080/07391102.1990.10507795" @default.
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