| Autor: |
Mrevlishvili GM, Buishvili LL, Dzhaparidze GSh, Kakabadze GR |
| Jazyk: |
ruština |
| Zdroj: |
Biofizika [Biofizika] 1995 May-Jun; Vol. 40 (3), pp. 518-26. |
| Abstrakt: |
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 density and excessive low-energy density of oscillatory states (DOS) peculiar to noncrystalline solids. It is concluded that heat capacity of DNA at very energies (less than 1 K) is well described in terms of the generally accepted model of two-level systems. The nature of excessive DOS at energies 3-10 K is related to oscillatory excitations on structural inhomogeneities, which can represent clusters of hydrate water molecules (approximately 1-2 nm) "grown" in DNA matrix. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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