Naslov
Fundamental Length Scales and Screening in Dilute and Semidilute Biopolyelectrolytes

Autori
Tomić, Silvia ; Dolanski Babic, Sanja ; Ivek, Tomislav ; Vuletic, Tomislav ; Krca, Sanja ; Griparić, Lorena ; Livolant, Francloise ; Podgornik, Rudi

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
International Conference and BioPhysics Summer School From Solid State to Biophysics IV / Forro, Laszlo ; Pavuna, Davor - Lausanne : Ecole Polytechnique Federale de Lausanne, 2008, 1-1

Skup
International Conference and BioPhysics Summer School From Solid State to Biophysics IV

Mjesto i datum
Cavtat, Hrvatska, 06.06.2008. - 13.06.2008

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
dielectric relaxation ; fundamental length scales ; screening

Sažetak
Structural properties of Na-DNA dilute and semidilute aqueous solutions are quantified using dielectric spectroscopy in the frequency range 100 Hz – 100 MHz[1, 2, 3]. Two relaxation modes are revealed that can be attributed to diffusive motion of DNA counterions. The overall study in the wide concentration, added salt and chain length range demonstrates that the motion detected at lower frequencies probes single-chain structural properties, whereas the one at higher frequencies characterizes the collectives properties of the DNA solution composed of many chains. The characteristic length scales found in the measurements compare well with the fundamental length scales predicted by the theory, as well as respective roles in ionic screening of intrinsic DNA counterions and added salt ions [4]. Surprisingly, new results obtained for Na-hyaluronic acid semidilute aqueous solutions indicate that the observed behavior until now might not concern generic properties of polyelectrolytes, rather that it bears features specific for DNA solutions. At the end, open issues and prospects for further research are designated. 1. S.Tomic, T.Vuletic, S.Dolanski Babic, S.Krca, D.Ivankovic, L.Griparic and R.Podgornik, Phys.Rev.Lett. 97, 098303 (2006). 2. S.Tomic, S.Dolanski Babic, T.Vuletic, S.Krca, D.Ivankovic, L.Griparic and R.Podgornik, Phys.Rev.E 75, 021905 (2007). 3. S.Tomic, S.Dolanski Babic, T.Ivek, T. Vuletic, S. Krca, F.Livolant and R. Podgornik, Europhys.Letters 81, 68003 (2008). 4. A.V.Dobrynin and M.Rubinstein, Prog.Polym.Sci. 30, 1049 (2005) ; A.V.Dobrynin, R.H.Colby and M.Rubinstein, Macromolecules 28, 1859 (1995).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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