期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
水化磷脂层中蛋白质和多肽的高分辨固体核磁共振波谱学(英文) 被引量:1
1
作者 傅日强 《波谱学杂志》 CAS CSCD 北大核心 2009年第4期437-456,共20页
有序样品的固体核磁共振(NMR)已快速发展成测定蛋白质和多肽在"仿真"水化磷脂层中高分辨结构的重要谱学方法.由于与膜相连的蛋白质和多肽的结构、动力学和功能往往都和其周边自然环境密切相关,因此人们把蛋白质和多肽有序排... 有序样品的固体核磁共振(NMR)已快速发展成测定蛋白质和多肽在"仿真"水化磷脂层中高分辨结构的重要谱学方法.由于与膜相连的蛋白质和多肽的结构、动力学和功能往往都和其周边自然环境密切相关,因此人们把蛋白质和多肽有序排列于水化磷脂层中进行固体NMR测量,从而获得与取向相关的各向异性自旋相互作用.这些取向约束可作为结构参数重构蛋白质在水化磷脂层中的高分辨三维结构.近十年来在样品制备,NMR探头和实验方法方面的显著发展,极大地促进了有序样品的固体NMR的发展,并使之成为测定与膜相连的蛋白质和多肽结构的有效方法.该综述介绍有序样品的固体NMR谱学方法,并总结此领域里的最新研究进展. 展开更多
关键词 固体核磁共振 膜蛋白 取向约束 水化磷脂
下载PDF
Revelation of Causes of Colour Change in Beryllium-Treated Sapphires
2
作者 Pichet Limsuwan Siwaporn Meejoo +4 位作者 Asanee Somdee Kheamrutai Thamaphat Treedej Kittiauchawal Atitaya Siripinyanond Jurek Krzystck 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第6期1976-1979,共4页
Blue sapphires are treated with Be in oxidizing atmosphere to change the blue colour into yellow. Untreated and Be-treated samples are examined using laser ablation inductively coupled-plasma-mass spectrometry (LA-I... Blue sapphires are treated with Be in oxidizing atmosphere to change the blue colour into yellow. Untreated and Be-treated samples are examined using laser ablation inductively coupled-plasma-mass spectrometry (LA-ICP- MS), electron spin resonance (ESR) and ultraviolet-visible (UV-vis) spectroscopy. The results show that the yellow colouration in Be-heated blue sapphires is not due to Be diffusion from the surface of sapphire. Be behaves as a sole catalyst in this process. We find that the charge transfer between the ferrous (Fe^2+) and ferric (Fe^3+) is the reason of the colour change. The above conclusions are confirmed by ESR measurements to determine the connections between the Fe3+ ions before and after Be-treated heat treatments. 展开更多
关键词 supernova explosion proto-neutron star shock wave
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部