Conductivity in hydrated proteins: No signs of the fragile-to-strong crossover

被引：89

作者：

Pawlus, S. ^{[1
]}

Khodadadi, S. ^{[1
]}

Sokolov, A. P. ^{[1
]}

机构：

[1] Univ Akron, Dept Polymer Sci, Akron, OH 44321 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.100.108103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dielectric spectroscopy studies of hydrated protein demonstrate smooth temperature variations of conductivity. This observation suggests no cusplike fragile-to-strong crossover (FSC) in the protein's hydration water. The FSC at T similar to 220 K was postulated recently on the basis of neutron scattering studies [Chen , Proc. Natl. Acad. Sci. U.S.A. 103, 9012 (2006)] and was proposed to be the main cause for the dynamic transition in hydrated proteins. Following Swenson et al. 6,9, we ascribe the neutron results to a secondary relaxation. We emphasize that no cusplike solvent behavior is required for the protein's dynamic transition.

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