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Screening and Fundamental Length Scales in Semidilute Na-DNA Aqueous Solutions (CROSBI ID 124790)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Tomić, Silvia ; Vuletić, Tomislav ; Dolanski Babić, Sanja ; Krča, Sanja ; Ivanković, Dušica ; Griparić, Lorena ; Podgornik, Rudi Screening and Fundamental Length Scales in Semidilute Na-DNA Aqueous Solutions // Physical review letters, 97 (2006), 098303-1-098303-4

Podaci o odgovornosti

Tomić, Silvia ; Vuletić, Tomislav ; Dolanski Babić, Sanja ; Krča, Sanja ; Ivanković, Dušica ; Griparić, Lorena ; Podgornik, Rudi

engleski

Screening and Fundamental Length Scales in Semidilute Na-DNA Aqueous Solutions

The fundamental length scales in semidilute Na-DNA aqueous solutions have been investigated by dielectric spectroscopy. The low- and the high-frequency relaxation modes are studied in detail. The length scale of the high-frequency relaxation mode at high DNA concentrations can be identified with the de Gennes– Pfeuty– Dobrynin correlation length of polyelectrolytes in semidilute solution, whereas at low DNA concentrations and in the low added salt limit the length scale shows an unusual exponent reminiscent of semidilute polyelectrolyte chains with hydrophobic backbone. The length scale of the low-frequency relaxation mode corresponds to a Gaussian chain composed of correlation blobs in the low added salt limit, and to the Odijk-Skolnick-Fixman value of the single chain persistence length in the high added salt limit.

DNA dielectric relaxation; fundamental length scales; screening

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Podaci o izdanju

97

2006.

098303-1-098303-4

objavljeno

0031-9007

Povezanost rada

Fizika, Kemija, Biologija

Indeksiranost