ࡱ> NPM` 6bjbjss 2: rtttt<4(B8:rrrr'''''''$)hE,(Qx#x#x#(ttrrCU('''x#trr''x#'''b^'r, 0lFh%p''k(0(',%*,','d ' (('(x#x#x#x#XdXtttttt ICSM Conference 2006 Offered Abstract or Poster Submission Form       Type your abstract on the following page, using the  HYPERLINK "http://www.cpregistrations.com/icsm2006/default.asp?page=c4p-preparation" Author Instructions for Offered Abstracts published on  HYPERLINK "http://www.conferencepartners.ie/icsm" www.conferencepartners.ie/icsm. Save this Submission Form and your abstract as one file in Microsoft Word with the surname of the first author, followed by initials as the file name (e.g.  Smyth TS ). E-mail this to  HYPERLINK "mailto:wblau@tcd.ie" wblau@tcd.ie Dielectric Spectroscopy of DNA Aqueous Solutions S.Tomi1*, S.Dolanski Babi1,2, T.Vuleti1, S.Kr a3, D.Ivankovi3, L.Gripari4 and R.Podgornik5 1Institut za fiziku, Zagreb, Croatia 2Dept. of Physics and Biophysics, Medical School, University of Zagreb, Zagreb, Croatia 3Rudjer Boakovi Institute, Zagreb, Croatia 4Dept. of Biological Chemistry, David Geffen School of Medicine, UCLA, Los Angeles, CA 5Dept.of Physics, University of Ljubljana and J .Stefan Institute, Ljubljana, Slovenia and Laboratory of Physical and Structural Biology NICHD, National Institute of Health, Bethesda, MD 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<DeLF<100 and 5<DeHF<20, centered at 0.5 kHz<nLF<70 kHz and 0.1 MHz<nHF<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). Title of paper: Dielectric spectroscopy of DNA aqueous solutions Names of authors Silvia Tomic Sanja Dolanski Babic Tomislav Vuletic Sanja Krca Dusica Ivankovic, Lorena Griparic and Rudi Podgornik Author for correspondence Silvia Tomic Institut za fiziku P.O.Box 304 HR-10001 Zagreb Croatia 385 1 4698820 385 1 4698889 stomic@ifs.hr Please insert an X to choose if you would like to submit your abstract for: Oral Presentation ___X___ OR Poster Presentation ______ Preferred Session at Conference (refer to Conference Programme for correct title): Indicate title of most appropriate session: ABEGHKMSU_`fgk% & 4 5 h i j μμμμμβve!jh#CJUmH sH !jh#CJUmH sH h#0JCJmH sH !jh#CJUmH sH jh#CJUmH sH h#CJmH sH "jh#CJUmHnHsH uh#mH sH jh#UmHnHtH uh#5\mH sH h#5CJ\aJmH sH %ACDEFGIJKNOPQRSVWXYZ[\]^_a$a$6abcdefhijklmno   f h j gd'"$a$gdz$a$gd'"   h j x |    ( * , . 0 2 X Z d v x z | ɻvvlh'"h'"6]h'"hz6] hz6]h'"hzH*h'"OJQJh'"h'"CJmH sH hzCJmH sH h'"hzCJmH sH h'"hzCJH*mH sH h$ Khz>*CJmH sH h!hxAmH sH hz5mH sH h'"h'"mH sH h'"CJmH sH *j , . x ( abcogdidgd=cgd]`gdqCgdgd$ K$a$gd'"gd'"$a$gd'"|  & ( * 6 8 < H \ ` b l ~   *79AEHIJPQ[]df h'"6] hh6]hz6H*] h[{I6]h'"hzH*h'"h'"6] h6]h'"hz6] hz6] hD6]E*06{| "$&6 6:>prv<HĻijޓ{wpfph!hAz6] h!hAzhAz h+H*hqh DH*hqh DOJQJ hqh Dh, mH sH h+H*mH sH hD(imH sH h#mH sH h 5mH sH h h mH sH h mH sH  h h hrjh hqhq hq h$ Kh$ K] h$ K6](e`cnorz)*/467f͸ͳ⩡~vng h'"h'"hidhid]h$ Kh=c]h=ch=cB*phh=ch=c5B*phhmh=cB*phh=cB*ph h=c] h|] hMU]h]h]5B*phh]B*phhmh]B*ph h]] hid] h+] hqChqChqChhAz h]H*$(bcd~ǸvvgvUFUFhR_5CJ\aJmH sH "hR_hR_5CJ\aJmH sH hB85CJ\aJmH sH "hB8hB85CJ\aJmH sH "hB8h#5CJ\aJmH sH "hB8h'"5CJ\aJmH sH h`CJaJmH sH h`h`CJaJmH sH h#hf4uh#5mH sH hf4u5mH sH h#5\mH sH h#mH sH h'"h'"6mH sH #.cd~;gdR_gd`gdf4u;QRx4#4$4%4w4U5V5X5l5m5n555666꾼ٚ h#CJhkh#CJmH sH hy3h#5mH sH hy3hy35mH sH Uhy3CJmH sH h#5CJ\hf4umH sH h#mH sH h#5mH sH h#"hR_hR_5CJ\aJmH sH ;<vwxy$4%4v4w4x4y44V5W5X5[5^5a5d5l5m5n5t55$a$gdBiomaterials and Bio-nanotechnology If not fitting well into session title, give two keywords to describe the topic: Non-standard poster displays Give a brief description of any additional aids you would like to use (e.g. video, computer) and likely space requirement. 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