Ionic mobility in DNA films studied by dielectric spectroscopy

Abstract : Double-helix DNA molecules can be found under different conformational structures driven by ionic and hydration surroundings. Usually, only the B-form of DNA, which is the only form stable in aqueous solution, can be studied by dielectric measurements. Here, the dielectric responses of DNA molecules in the A- and B-form, oriented co-linearly within fibres assembled in a film have been analyzed. The dielectric dispersion, permittivity and dissipation factor, have been measured as a function of frequency, strength voltage, time, temperature and nature of the counter-ions. Besides a high electrode polarization component, two relaxation peaks have been observed and fitted by two Cole-Cole relaxation terms. In the frequency range that we investigated (0.1Hz to 5 10^6Hz) the dielectric properties are dominated by the mobility and diffusivity of the counter-ions and their interactions with the DNA molecules, which can therefore be characterized for the A- and B-forms of DNA.
Type de document :
Article dans une revue
European Physical Journal E: Soft matter and biological physics, EDP Sciences: EPJ, 2014, 37, pp.82. 〈10.1140/epje/i2014-14082-5〉
Liste complète des métadonnées

Littérature citée [24 références]  Voir  Masquer  Télécharger

https://hal-ens-lyon.archives-ouvertes.fr/ensl-01069225
Contributeur : Michel Peyrard <>
Soumis le : lundi 29 septembre 2014 - 09:01:45
Dernière modification le : mardi 21 août 2018 - 11:58:03
Document(s) archivé(s) le : vendredi 14 avril 2017 - 14:02:09

Fichier

DNAdielMP3-revised.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Abdelkader Kahouli, Jessica Valle Orero, Jean-Luc Garden, Michel Peyrard. Ionic mobility in DNA films studied by dielectric spectroscopy. European Physical Journal E: Soft matter and biological physics, EDP Sciences: EPJ, 2014, 37, pp.82. 〈10.1140/epje/i2014-14082-5〉. 〈ensl-01069225〉

Partager

Métriques

Consultations de la notice

119

Téléchargements de fichiers

81