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- W2017458056 abstract "Abstract This paper describes a calorimetric investigation of the effect of substitution of methyl and bromine groups at the 5-position of the cytosine ring upon the heats of reaction accompanying the formation of the different 1:1 complexes between these polyribocytidylic acid derivatives and poly(rI). The ΔH of reaction to form poly(rBrC) · poly(rI) at 25 and 37 °C was found to be − 7200 and − 7755 cal./mole of base pairs, respectively. This value is about 2 kcal./mole of base pairs greater than that found for poly(rC) · poly(rI); thus, the bromine substituent produces a large enthalpic stabilization. The ΔH 's for poly r(C,BrC) copolymers reacting with poly(rI) were found to vary linearly with bromine content over the entire range of copolymer composition, indicating the absence of any interactions depending upon the sequence of bromine-containing residues. The ΔH of reaction to form poly(rMeC) · poly(rI) was found to be about − 6300 cal./mole of base pairs at 25 and 37 °C. This value represents an enthalpic stabilization relative to poly(rC) · poly(rI) of 700 cal./mole of base pairs arising from the presence of the methyl group. These results clearly show that different types of nucleic acid base pairs can have different enthalpies and entropies characterizing their interaction." @default.
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- W2017458056 date "1971-11-01" @default.
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- W2017458056 title "Heat of reaction of polyribo-5-bromocytidylic acid and polyribo-5-methylcytidylic acid with polyriboinosinic acid" @default.
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- W2017458056 doi "https://doi.org/10.1016/0022-2836(71)90075-1" @default.
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