Dielectric behavior of DNA in water-organic co-solvent mixtures (Articolo in rivista)

Type
Label
  • Dielectric behavior of DNA in water-organic co-solvent mixtures (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Bonincontro, A; Cametti, C; Nardiello, B; Marchetti, S; Onori, G (2006)
    Dielectric behavior of DNA in water-organic co-solvent mixtures
    in Biophysical chemistry (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bonincontro, A; Cametti, C; Nardiello, B; Marchetti, S; Onori, G (literal)
Pagina inizio
  • 7 (literal)
Pagina fine
  • 13 (literal)
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  • 121 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma La Sapienza, Dipartimento Fis, Res Ctr, SOFT,INFM,CNR, I-00185 Rome, Italy; Univ Roma La Sapienza, CNISM, I-00185 Rome, Italy; Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy (literal)
Titolo
  • Dielectric behavior of DNA in water-organic co-solvent mixtures (literal)
Abstract
  • The radiowave dielectric dispersions of DNA in different water-organic co-solvent mixtures have been measured in the frequency range from 100 kHz to 100 MHz, where the polarization mechanism is generally attributed to the confinement of counterions within some specific lengths, either along tangential or perpendicular to the polyion chain. The dielectric dispersions have been analyzed on the basis of two partially different dielectric models, a continuum counterion fluctuation model proposed by Mandel and a discrete charged site model, proposed by Minakata. The influence of the quality of the solvent on the dielectric parameters has been investigated in water-methanol and water-glycerol mixtures at different composition, by varying the permittivity epsilon(m) and the viscosity eta of the solvent phase. The analysis of the dielectric spectra in solvents where electrostatic and hydrodynamic interactions vary with the solvent composition suggests that both the two models are able, in principle, to account for the observed high-frequency dielectric behavior. However, while some certain assumptions are necessary about the polyion structure within the Mandel model, no structural prerequisite is needed within the Minakata model, where the polarization mechanism invoked considers a radial counterion exchange with the outer medium, which is largely independent of the local polyion conformation. (c) 2005 Elsevier B.V. All rights reserved. (literal)
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