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- W51849132 abstract "poly(A-C), poly(G-T), poly(A-G), poly(C-T) in RNA, and B and C form DNA geometries. Calculations are carried out for poly((A-A-T) . (A-T-T)) and poly((A-G-C) . (G-C-T)) in RNA and B-DNA geometries, and for polyadenylic acid and polyionsinic acid in nonstandard geometries. The CD difference spectra obtained upon melting of the two double-stranded polymers are very similar. Comparison of these difference spectra with calculated ones suggests that optical transitions near 272 nm (on A) and 288 nm (on T) are present. Premelting changes of the CD spectrum of poly(d(A-T) . d(A-T)) are due to a change in conformation in which the secondary structure goes from C- to B-type spectrum by increasing the A-type nature of the polymer. Such a change is not observed for poly(d(A) . d(T)); instead, a transition between two different B-type geometries occurs. 13 figures, 34 references. (DLC)" @default.
- W51849132 created "2016-06-24" @default.
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- W51849132 date "1975-05-01" @default.
- W51849132 modified "2023-10-16" @default.
- W51849132 title "Polynucleotide circular dichroism calculations: use of all order polarizability theory" @default.
- W51849132 doi "https://doi.org/10.2172/5050909" @default.
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