Dynamics of water in binary and ternary solutions of DNA and porphyrins |
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Authors: | V?T?Lebedev Yu?V?Kulvelis Gy?T?r?k |
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Institution: | 1.Konstantinov Petersburg Nuclear Physics Institute,Russian Academy of Sciences,Gatchina, Leningradskaya oblast,Russia;2.Research Institute for Solid State Physics and Optics,Hungarian Academy of Sciences,Budapest,Hungary |
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Abstract: | The dynamics of heavy water (at 20°C) in solutions with polyanionic DNA chains and ternary systems containing DNA and negatively charged tetraphenylporphyrins has been investigated using neutron resonance spin echo in the time range t = 1?1000 ps. The diffusion dynamics has been observed in the momentum transfer range q = 1.3?1.8 Å?1, and the relaxation rates in single-component, binary, and ternary systems are close to each other. Apart from the relaxation, the vibrational mode in the solutions has been revealed at the momentum transfer q = 1.9 Å?1. The introduction of porphyrins into the solution (one molecule per ten DNA base pairs) has resulted in a retardation of diffusion and a considerable increase (by 5–10%) in the frequency of translational vibrations of water molecules due to the interaction with porphyrin molecules. |
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