Fundamental Length Scales and Screening in Dilute and Semidilute Biopolyelectrolytes (CROSBI ID 545127)
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Podaci o odgovornosti
Tomić, Silvia ; Dolanski Babic, Sanja ; Ivek, Tomislav ; Vuletic, Tomislav ; Krca, Sanja ; Griparić, Lorena ; Livolant, Francloise ; Podgornik, Rudi
engleski
Fundamental Length Scales and Screening in Dilute and Semidilute Biopolyelectrolytes
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).
dielectric relaxation ; fundamental length scales ; screening
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Podaci o prilogu
1-1.
2008.
objavljeno
Podaci o matičnoj publikaciji
International Conference and BioPhysics Summer School From Solid State to Biophysics IV
Forro, Laszlo ; Pavuna, Davor
Lausanne: Ecole Polytechnique Federale de Lausanne
Podaci o skupu
International Conference and BioPhysics Summer School From Solid State to Biophysics IV
predavanje
06.06.2008-13.06.2008
Cavtat, Hrvatska