The complex dielectric constant of collagen in aqueous solutions (polymer concentration, C, = 0.02-0.2%) was measured a t 10ยฐC in the frequency range from 3 Hz to 30 kHz. The loss peak for C, = 0.02% is located a t 90 Hz and the dielectric relaxation time rn is estimated to be 1.8 f 0.3 msec. The TL
On the mechanism of dielectric relaxation in aqueous DNA solutions
โ Scribed by B. Saif; R. K. Mohr; C. J. Montrose; T. A. Litovitz
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1991
- Tongue
- English
- Weight
- 844 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0006-3525
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โฆ Synopsis
SYNOPSIS
The complex dielectric response of calf thymus DNA in aqueous saline solutions has been measured from 1 MHz to 1 GHz. The results are presented in terms of the relaxation of the incremental contributions to the permittivity and conductivity from the condensed counterions surrounding the DNA molecules. Measurements of the low-frequency conductivity of the samples also lends support to the condensed counterion int,erpretation.
๐ SIMILAR VOLUMES
The dielectric properties of aqueous solutions of DNA were measured at frequencies ranging from 0.1 to 12 GHz. The results are analyzed using the Maxwell mixture theory and yield a value for the hydration of the DNA of about 0.4 g/g, which is in the range ohserved in other investigations. No evidenc
The dieleclric relaxation of DNA solutions has been investigated with and wilhout extraneous ions covering a wide frequency range. The effect of monovalent ions such m Na, K, and Li w well as divalent ions such as Mg, Ca, and Hg have been included in the study. These ions are found to have a profoun
## Abstract Equations are derived which account for the effect of an applied electric field on the fluctuation of protons associated with a macromolecule. The contribution of this proton polarization to the complex permittivity of the macromolecules is evaluated in terms of its effect on both the d