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arXiv 0705.2049physics.bio-phphysics.chem-ph
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蛋白质在太赫兹介电响应中的动力学跃迁

Protein Dynamical Transition in Terahertz Dielectric Response

Andrea G. Markelz, Joseph R. Knab, Jing Yin Chen, Yunfen He

摘要:

在太赫兹介电响应中首次观察到200 K蛋白质动力学跃迁。在0.2 - 2.0 THz和80-294 K范围内确定复介电常数$ε$ = $ε$“+ i $ε$“。$ε$“在200 K以下具有线性温度依赖性,然后急剧增加。$ε$“中的低温线性相关性表明温度为80 K < T < 180 K时存在非谐性,这对低于200 K的假设谐性提出了挑战。温度依赖性与β弛豫响应是一致的,并表明参与动力学转变的蛋白质运动扩展到亚皮秒时间尺度。

英文摘要:

The 200 K protein dynamical transition is observed for the first time in the teraherz dielectric response. The complex dielectric permittivity $ε$ = $ε$' + i$ε$" is determined in the 0.2 - 2.0 THz and 80-294 K ranges. $ε$" has a linear temperature dependence up to 200 K then sharply increases. The low temperature linear dependence in $ε$" indicates anharmonicity for temperatures 80 K < T < 180 K, challenging the assumed harmonicity below 200K. The temperature dependence is consistent with beta relaxation response and shows the protein motions involved in the dynamical transition extend to subpicosecond time scales.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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