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Proton and Deuteron Relaxation Study of Molecular Dynamics in Lysozyme Solutions

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Kakule J. F., Węglarz W. P., Shenoy R. K., Sharp A. R., Peemoeller H.
Acta Physica Polonica A
|
2000
|
vol. 98
|
issue 1-2
131-152
EN
A nuclear magnetic resonance spin-lattice relaxation dispersion study of the relaxation of several magnetization components in both natural and deuterated lysozyme solutions was undertaken at 20°C. Proton and deuteron resonances were employed. The two-dimensional time evolution of the magnetization and the spin-spin relaxation were analyzed. In addition, an isotopic dilution study was performed at 5 and 30.6MHz. The results indicate that the water proton spin-lattice relaxation rate which arises from intermolecular relaxation between the water protons and the lysozyme protons represents a relatively strong relaxation mechanism. A model for the dynamics of the water molecules, consistent with the proton and deuteron dispersions as well as with the isotopic dilution results, is presented.
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