Protein Folding in Nano-Sized Cylinders

The folding of a model protein confined in a nano-sized cylinder is studied by the off-lattice Go^-like model. The entropy and anisotropy effects of confinement on thermodynamics and dynamics for folding are investigated. Our results show that due to reduction of the search on conformations, the folding rate can be sped up and the thermodynamic stability is enhanced at the cost of the decrease of folding cooperativity. In addition, it is found that these are shape-dependent. Folding is optimized in a cylinder with an appropriate shape when the volume is fixed. This is probably related to the shape of the protein molecule. Furthermore, our results also suggest that there is an orientational transition for the protein molecule following the variation of the radius of cylinder.     

非金属表面温度测量的薄膜热电偶技术

薄膜热电偶是解决非金属表面温度测量的有效手段。它的工作原理与常规热电偶一样,但并不利用现成的热电偶丝材料,而是用离子轰击热电偶母材使之溅射到被测表面上沉积而制成的。显微检查表明溅射薄膜与被测表面的结合十分紧密,足以保证薄膜热电偶反映的确是被测表面温度。溅射薄膜的厚度一般只有0.5～1.0微米,常规热电偶要有     

基于PROSAIL模型的高寒冬季枯草关键参数阈值率定

冬季牧草即枯草的存量是生态补偿计算与畜牧生产科学管理的关键基础,而对青藏高原枯草关键参数认识的不足,直接限制了高寒冬季枯草监测研究与应用发展.PROSAIL是一种光学辐射传输模型,它可以定量描述植被参数与冠层反射率的关系.利用最新版本PROSAIL模型,结合野外实测的枯草光谱及叶面积、叶绿素等10个性状参数数据,模拟生...