The characteristic relaxation time tau of protein hydration water exhibits a strong hydration level h dependence. The dynamic crossover is observed when h is higher than the monolayer hydration level h(c) = 0.2-0.25 and becomes more visible as h increases. When h is lower than hc, tau only exhibits Arrhenius behavior in the measured temperature range. The activation energy of the Arrhenius behavior is insensitive to h, indicating a local-like motion. Moreover, the h dependence of the crossover temperature shows that the protein dynamic transition is not directly or solely induced by the dynamic crossover in the hydration water.
Hydration-dependent dynamic crossover phenomenon in protein hydration water / Wang, Zhe; Fratini, Emiliano; Li, Mingda; Le, Peisi; Mamontov, Eugene; Baglioni, Piero; Chen, Sow-Hsin. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - STAMPA. - 90:(2014), pp. 0-0. [10.1103/PhysRevE.90.042705]
Hydration-dependent dynamic crossover phenomenon in protein hydration water
FRATINI, EMILIANO;BAGLIONI, PIERO;
2014
Abstract
The characteristic relaxation time tau of protein hydration water exhibits a strong hydration level h dependence. The dynamic crossover is observed when h is higher than the monolayer hydration level h(c) = 0.2-0.25 and becomes more visible as h increases. When h is lower than hc, tau only exhibits Arrhenius behavior in the measured temperature range. The activation energy of the Arrhenius behavior is insensitive to h, indicating a local-like motion. Moreover, the h dependence of the crossover temperature shows that the protein dynamic transition is not directly or solely induced by the dynamic crossover in the hydration water.File | Dimensione | Formato | |
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