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- Title
Dynamics of sodium counterions in the DNA ion-hydrate shell.
- Authors
Alekseyev, O. M.; Bulavin, L. A.; Shamayko, D. O.
- Abstract
The lifetime of DNA counterions was determined using the phenomenological model, developed in this work. The counterions bonded to DNA are characterized by the lifetime and do not make contribution to the conduc- tivity of the system. Free counterions, moving around the double helix make the main contribution to the conductivity. Using the theory of electrolyte conductivity, the formula connecting the counterion lifetime and conductivity was obtained. The conductivity of DNA aqueous solutions was determined for different concentrations of DNA (0.001-0.2% by mass) at frequencies 0,1-100 kHz. The results show that in dilute DNA aqueous solutions (0.001%) the lifetime is about 1 µs, and in the concentrated aqueous solutions (0.15 %) it is about 1 ms.
- Subjects
DNA; HYDRATES; IONIC conductivity; CONDUCTIVITY of electrolytes; AQUEOUS solutions; HELICAL structure; MACROMOLECULES; ELECTROLYTES; SODIUM
- Publication
Ukrainica Bioorganica Acta, 2011, Vol 9, Issue 2, p45
- ISSN
1814-9758
- Publication type
Article