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Role of counterions in the gigahertz relaxation of wet DNA

Publication ,  Journal Article
Edwards, G; Ying, G; Tribble, J
Published in: Physical Review A
January 1, 1992

We have measured the dielectric properties of concentrated solutions and gels (30 mg/ml) of random-sequenced DNA from E. coli in the 400-MHz26-GHz range. Two Debye-type relaxations are evident, one with a relaxation time near 9 ps and attributable to the classical Debye relaxation of water. More noteworthy is a second relaxation process with a characteristic time in the 20200-ps range, i.e., a relaxation frequency in the 0.88-GHz range, depending upon the species of the counterions and the temperature. The slower relaxation process has an enthalpy of 3.3 kcal/mol and is accounted for by a counterion-based relaxation process. These experimental results are considered in terms of two models from polyelectrolyte theory, one by Oosawa [Biopolymers 9, 677 (1970)] and Wyllie [in Dielectric and Related Molecular Processes, edited by M. Davies (American Chemical Society, Washington, D.C., 1972), Vol. 1], and the other by Manning [Q. Rev. Biophys. 11, 179 (1978); Acc. Chem. Res. 12, 443 (1979)], and we propose that different ion-based relaxation mechanisms dominate in different hydration regimes. © 1992 The American Physical Society.

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Published In

Physical Review A

DOI

ISSN

1050-2947

Publication Date

January 1, 1992

Volume

45

Issue

12

Related Subject Headings

  • General Physics
  • 03 Chemical Sciences
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Edwards, G., Ying, G., & Tribble, J. (1992). Role of counterions in the gigahertz relaxation of wet DNA. Physical Review A, 45(12). https://doi.org/10.1103/PhysRevA.45.R8344
Edwards, G., G. Ying, and J. Tribble. “Role of counterions in the gigahertz relaxation of wet DNA.” Physical Review A 45, no. 12 (January 1, 1992). https://doi.org/10.1103/PhysRevA.45.R8344.
Edwards G, Ying G, Tribble J. Role of counterions in the gigahertz relaxation of wet DNA. Physical Review A. 1992 Jan 1;45(12).
Edwards, G., et al. “Role of counterions in the gigahertz relaxation of wet DNA.” Physical Review A, vol. 45, no. 12, Jan. 1992. Scopus, doi:10.1103/PhysRevA.45.R8344.
Edwards G, Ying G, Tribble J. Role of counterions in the gigahertz relaxation of wet DNA. Physical Review A. 1992 Jan 1;45(12).

Published In

Physical Review A

DOI

ISSN

1050-2947

Publication Date

January 1, 1992

Volume

45

Issue

12

Related Subject Headings

  • General Physics
  • 03 Chemical Sciences
  • 02 Physical Sciences
  • 01 Mathematical Sciences