观察到RNA水合水中触发生物聚合物玻璃化转变的动态交叉
Observation of a Dynamic Crossover in RNA Hydration Water which Triggers the Glass Transition in the Biopolymer
摘要：
高分辨率准弹性中子散射光谱被用来测量H2O和D2O水合RNA样品。通过取两个样品之间的信号差来减去来自RNA的散射的贡献。测量是在从270 K到180 K的一系列温度下进行的。采用松弛笼模型对不同的准弹性谱进行了分析。我们观察到明确的证据表明，在TL = 220 K的RNA水合水的一个脆弱的强动态交叉（FSC）。我们进一步表明，在大约相同的温度220 K下，RNA及其水合水中的氢原子的均方位移在斜率上呈现急剧变化。后一个事实表明，RNA中的动态转变（或玻璃化转变）是由水合水在其FSC温度TL下的流动性的突然变化触发的。
英文摘要：
High-resolution quasi-elastic neutron scattering spectroscopy was used to measure H2O and D2O hydrated RNA samples. The contribution of scattering from RNA was subtracted out by taking the difference of the signals between the two samples. The measurements were made at a series of temperatures from 270 K down to 180 K. The Relaxing-Cage Model was used to analyze the difference quasi-elastic spectra. We observed clear evidence of a fragile-to-strong dynamic crossover (FSC) at TL = 220 K in RNA hydration water. We further show that the mean-square displacement of the hydrogen atoms in both RNA and its hydration water exhibit a sharp change in slope at approximately the same temperature 220 K. This latter fact suggests that the dynamic transition (or the glass transition) in RNA is triggered by the abrupt change of mobility of the hydration water at its FSC temperature TL.
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