Experimental evidence of logarithmic relaxation in single-particle dynamics of hydrated protein molecules

Research Area: Uncategorized Year: 2010
Type of Publication: Article
Journal: SOFT MATTER Volume: 6
Number: 12 Pages: 2623-2627
We observe a logarithmic-like decay of the intermediate scattering function (ISF) of the hydrogen atoms in the protein molecule in the time interval from 10 ps to 1 ns. We analyze the ISF, F(H)(Q,t), in terms of an asymptotic expression proposed by mode coupling theory (MCT). The result clearly shows that this logarithmic stretching of the beta-relaxation range is real, substantiating the prediction of the molecular dynamics (MD) simulation results that used the formula proposed by MCT for the analysis of ISF.
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