Dielectric Spectroscopy of DNA Aqueous Solutions (CROSBI ID 518235)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa
Podaci o odgovornosti
Tomić, Silvia ; Dolanski Babić, Sanja ; Vuletić, Tomislav ; Krča, Sanja ; Ivanković, Dušica ; Griparić, Lorena ; Podgornik, Rudi
engleski
Dielectric Spectroscopy of DNA Aqueous Solutions
We demonstrate the power of low-frequency dielectric spectroscopy (40 Hz – 110 MHz) as an highly-sensitive and non-destructive technique to detect dispersion of DNA aqueous solutions and give information on the fundamental length scales that determine the structure of these solutions composed of many DNA polymers1. Results for polydisperse genomic Na-DNA (most of fragments with 20 kbp) reveal two broad relaxation modes of strength 20<  LF<100 and 5<  HF<20, centered at 0.5 kHz< LF<70 kHz and 0.1 MHz< HF<15 MHz2. We discuss possible assignments for these relaxation modes inside the framework of the standard double layer model for polarization response of charged biopolymers in solution3. The results show that there are three fundamental length scales that determine the dielectric response of a semidilute DNA solution, each of them following the power law behavior with a distinct exponent. These are the average separation between the polyelectrolyte chains, or equivalently the screening length of DNA acting as its own salt, the salt-dependent persistence length of a single polyelectrolyte chain and the mesh size of the polyelectrolyte solution. References: 1. F. Bordi, C. Cametti and R.H. Colby, J.Phys.: Condens. Matter 16, R1423 (2004). 2. S.Tomic et al., submitted to Phys.Rev.Lett. (February 2006). 3. A.V.Dobrynin and M.Rubinstein, Prog.Polym.Sci. 30, 1049 (2005) and A.V.Dobrynin, R.H.Colby and M.Rubinstein, Macromolecules 28, 1859 (1995).
Dielectric spectroscopy; DNA dielectric relaxation; fundamental length scales
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
Tu78-x.
2006.
objavljeno
Podaci o matičnoj publikaciji
The International Conference on Science and Technology of Synthetic Metals
Blau, Werner
Dublin: Trinity College Dublin
Podaci o skupu
The International Conference on Science and Technology of Synthetic Metals
predavanje
02.07.2006-07.07.2006
Dublin, Irska