离子对低分子量DNA介电分散体中反离子涨落的影响。
Effect of ions on counterion fluctuation in low-molecular weight DNA dielectric dispersions.
作者信息
Bonincontro A, Cametti C, Di Biasio A, Pedone F
出版信息
Biophys J. 1984 Mar;45(3):495-501. doi: 10.1016/S0006-3495(84)84185-5.
The dielectric permittivity of aqueous solutions of low-molecular weight DNA (Mr = 3.2 X 10(5) ) in the presence of MgCl2 and AgNO3 has been measured in the frequency range from 5 kHz to 30 MHz, at a temperature of 25 degrees C. The DNA concentration was 3.5 X 10(-4) M in terms of phosphate and the salt concentration was varied from 1 X 10(-5) to 2 X 10(-4) M. The dielectric results have been analyzed in terms of two contiguous dielectric dispersions, and characteristic parameters have been discussed on the basis of polyelectrolyte theories which deal with counterion fluctuation. Some molecular parameters of the DNA molecule in electrolyte solutions are estimated.
在25摄氏度下，测量了低分子量DNA（Mr = 3.2×10⁵）的水溶液在MgCl₂和AgNO₃存在下，频率范围从5 kHz到30 MHz时的介电常数。以磷酸盐计，DNA浓度为3.5×10⁻⁴ M，盐浓度从1×10⁻⁵变化到2×10⁻⁴ M。根据两个连续的介电色散对介电结果进行了分析，并基于处理反离子涨落的聚电解质理论讨论了特征参数。估算了电解质溶液中DNA分子的一些分子参数。
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