Neutron scattering studies of dynamic crossover phenomena in a coupled system of biopolymer and its hydration water
- Neutron scattering studies of dynamic crossover phenomena in a coupled system of biopolymer and its hydration water
- Sow-Hsin Chen; Francesco Mallamace; Xiang-qiang Chu; 김찬수; M Lagi; Antonio Faraone; Emiliano Fratini; Piero Baglioni
- Issue Date
- Journal of Physics: Conference Series
- VOL 177, NO 1, 012006-1-012006-6
- We have observed a Fragile-to-Strong Dynamic Crossover (FSC) phenomenon of the
α-relaxation time and self-diffusion constant in hydration water of three biopolymers: lysozyme,
B-DNA and RNA. The mean squared displacement (MSD) of hydrogen atoms is measured by
Elastic Neutron Scattering (ENS) experiments. The α-relaxation time is measured by Quasi-
Elastic Neutron Scattering (QENS) experiments and the self-diffusion constant by Nuclear
Magnetic Resonance (NMR) experiments. We discuss the active role of the FSC of the hydration
water in initiating the dynamic crossover phenomenon (so-called glass transition) in the
biopolymer. The latter transition controls the flexibility of the biopolymer and sets the low
temperature limit of its biofunctionality. Finally, we show an MD simulation of a realistic
hydrated powder model of lysozyme and demonstrate the agreement of the MD simulation with
the experimental data on the FSC phenomenon in the plot of logarithm of the α-relaxation time vs.
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