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- W1566605849 abstract "The sedimentation velocity behavior of both closed (I) and nicked (II) circular bacteriophage PM2 DNA's has been determined in aqueous NaClO4 solutions ranging from 0.98 to 7.2 m. The addition of the salt results in a progressive, non-cooperative unwinding of the DNA duplex to the extent of 3.9% at 7.2 m-NaClO4, as determined by comparison with the sedimentation velocity/dye titration results of Upholt, Gray & Vinograd (1971), The salt-induced unwinding is complemented and extended by the intercalation of ethidium bromide, and the shape of the sedimentation velocity/dye titration curve in 0.98 m-NaClO4 is similar to that in 2.85 m-CsCl (Upholt et al., 1971). The sedimentation coefficient ratio SISII has the same dependence upon NaClO4 concentration at 5 °C and at 20 °C, except for an effective translation to 0.8 m higher salt concentrations at the lower temperature. This shift is consistent with the known effects of temperature upon the duplex rotation angle (Wang, 1969). The unwinding of the DNA duplex in the presence of increasing NaClO4 concentrations is to be contrasted with the much smaller overwinding which occurs upon the addition of NaCl or CsCl at 20 °C (Wang, 1969). The NaClO4-induced unwinding takes place at temperatures well below the onset of the melting transition, and the specific salt effect does not appear to have a large temperature coefficient. The results indicate that substantial angular alteration of the duplex may be induced by a change in solution environment in the absence of transition to the coiled form of DNA." @default.
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- W1566605849 date "1972-06-01" @default.
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- W1566605849 title "Structure of DNA in denaturing solvents" @default.
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- W1566605849 doi "https://doi.org/10.1016/0022-2836(72)90235-5" @default.
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