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SUMMARY:Comparative Analysis of Ion-Specific Effects on the Electrophysica
 l and Rheological Properties of DNA Aqueous Solutions with LiCl\, NaCl\, a
 nd KCls
DTSTART;VALUE=DATE-TIME:20260922T140500Z
DTEND;VALUE=DATE-TIME:20260922T141000Z
DTSTAMP;VALUE=DATE-TIME:20260914T044826Z
UID:indico-contribution-531@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Mariia Sosnovska (Taras Shevchenko National Universi
 ty of Kyiv)\nDNA is a strong polyanionic polyelectrolyte with the properti
 es\, which are largely governed by interactions with charged ions (counter
 ions) in aqueous solution. Alkali metal cations differ substantially in io
 nic radius\, charge density\, and hydration enthalpy\, which in turn deter
 mine how strongly they bind to the phosphate backbone\, reorganize the sur
 rounding hydration shell\, and affect macroscopic transport and hydrodynam
 ic properties of the solution [1\,2].\nThis work presents a comparative an
 alysis of the electrical conductivity and viscosity of aqueous high-molecu
 lar-weight DNA solutions in the presence of LiCl\, NaCl\, and KCl across a
  common range of salt concentrations and temperatures. Rather than treatin
 g each system in isolation\, the ionic series Li⁺ → Na⁺ → K⁺ is 
 examined as a single trend\, allowing the relative contributions of cation
  size and hydration strength to charge transport and DNA conformational be
 havior to be disentangled. Comparison of the conductivity and viscosity re
 sponses reveals systematic\, ion-specific deviations that correlate with t
 he strength of cation–phosphate binding and the degree of ion dehydratio
 n upon association with DNA. The concentration- and temperature-dependence
  of these deviations further indicates how the balance between electrostat
 ic screening and hydration-shell restructuring shifts along the Li⁺–Na
 ⁺–K⁺ series.\nThese comparative trends provide a more direct route t
 o identifying the mechanisms underlying ion-specific effects in DNA–elec
 trolyte systems than analysis of individual salts alone\, and contribute t
 o a more general understanding of counterion selectivity in polyelectrolyt
 e solutions.\n[1]. Ross\, P. D.\, & Scruggs\, R. L. (1968). Viscosity stud
 y of DNA. II. The effect of simple salt concentration on the viscosity of 
 high molecular weight DNA and application of viscometry to the study of DN
 A isolated from T4 and T5 bacteriophage mutants. Biopolymers\, 6(8)\, 1005
 –1018. https://doi.org/10.1002/bip.1968.360060805\n[2]. Perepelytsya\, S
 .\, Piatnytskyi\, D.\, Bubon\, T.\, Cibotariu\, N.\, Laaksonen\, A.\, & Mo
 cci\, F. (2026). Ions as architects of DNA nanostructures: Mechanisms\, si
 mulations\, and technological frontiers. Small Structures\, 7\, e202500786
 . https://doi.org/10.1002/sstr.202500786\n\nhttps://indico.bitp.kiev.ua/ev
 ent/18/contributions/531/
LOCATION:Bogolyubov Institute for Theoretical Physics Conference Hall
URL:https://indico.bitp.kiev.ua/event/18/contributions/531/
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