Giorgie Dzhaparidze

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The data on low-temperature heat capacity (2-25 K) of native DNA strands at different humidities are presented, which take into account the specificity of hydration of DNA due to its chemical composition (GC-content). The temperature dependence of DNA heat capacity (Cp = f(T)) at 2-4 K was analyzed. Analysis of Cp = f(T) involves both the ordinary Debay(More)
Experimental results are presented on temperature--dependent DNA heat capacity in three different states: a) intact--native DNA in the conformation of double helix, b) disordered conformation of polynucleotide chains in the state of statistical coils, c) completely "degenerated" polynucleotide chains--mechanical mixture of nucleotides. Data on heat capacity(More)
Dzhaparidze, G., The logic of arithmetical hierarchy, Formulas of the propositional modal language with the unary modal operators 0, as schemata of sentences of arithmetic (PA), where q A is interpreted as (a formalization of) " A is PA-provable " , X,,A as " A is PA-equivalent to a &-sentence " and &,A as " A is PA-equivalent to a Boolean combination of(More)
Thermodynamic parameters of water phase transition and eutectics melting in DNA water-salt solution were studied by means of low temperature scanning differential microcalorimetry at different concentrations of polyanions. DNA hydration was measured and the character of changes in Na+ counterion binding was revealed during the transition of double helix(More)
Adiabatic low temperature microcalorimeter working in a wide temperature range, including that of liquid helium, is described. Heat capacity of DNA at various water concentrations was measured at 4-400 degrees K. It is shown that the pattern of its change is determined by the hydration parameter n (number of water molecules per mole of base pairs).(More)