分子信标技术

分子信标是一种高灵敏度、高特异性的新型荧光核酸探针。它在与互补DNA／RNA靶序列杂交时放出荧光。本文结合本实验室的研究,从分子信标的结构、性质、应用及发展等进行了介绍。     

喜树碱衍生物的合成研究进展

目前有不少关于对喜树碱分子结构改进和修饰的报道，许多高活性的喜树碱衍生物相继问世。其中，10-经基喜树碱、拓普替康、伊立替康以及9-氨基、9-硝基喜树碱、7-乙基-10-羟基喜树碱等在临床显示了广泛的抗癌活性。本文综述对喜树碱衍生物的一些最新合成进展。参考文献19篇。     

铵光卤石气固反应法制备无水氯化镁

铵光卤石气固反应法制备无水氯化镁;ouig     

基于双吡啶脲类Cd(Ⅱ)、Zn(Ⅱ)、Hg(Ⅱ)配合物的合成及晶体结构

间苯二胺和3-吡啶异氰酸酯在甲苯中加热回流得到双吡啶脲类配体L,然后将配体分别与CdSO₄·8H₂O,ZnI₂,HgI₂,HgCl₂进行配位反应,得到4个配合物{[Cd（L）（SO₄）（H₂O）₃]·H₂O}_n（1）,{[Zn（L）I₂]·2C₂H₅OH}_n（2）,{[Hg（L）I₂]·C₂H₅OH}_n（3）,[Hg（L）Cl₂]·H₂O（4）,并用元素分析、FT-IR、X射线单晶衍射、粉末衍射对其进行了表征。配合物1形成一维螺旋链结构,配合物2和3形成一维“之”字链结构,配合物4形成32元环状结构。     

借助集团展开的超辐射热力学

N原子-单模辐射场相互作用系统当作相互作用准玻色子-光子系统并处理作巨正则系综.系统热力学势的明显表达式应用集团展开得到，某些热力学量按通常的热力学公式导出.数值计算和图示表明了这个超辐射系统的热力学行为，在超辐射态临界线上和其他地方出现的奇异性揭示了在此合作系统中存在第二类相变换. 关键词：     

5‘—硝基水杨基荧光酮双波长标准加入分光光度法同时测定？…

在０．３－０．９ｍｏｌ／Ｌ硫酸介质中，在溴化十六烷基三甲铵存在下，５’－硝基水杨基荧光酮与锗和钼形成最大吸收波长分别为５１３和５３３ｎｍ的红色配合物，其吸收光谱严重重叠。基于此，本文采用双波长标准加入法对该混合物的显色体系进行了研究，建立了同时分光光度测定锗和钼的新方法，并与等吸收双波长法作了比较。     

Visualizations of Light-induced Refractive Index Changes in Photorefractive Crystals Employing Digital Holography

We propose a novel approach to visualize the light-induced refractive index changes in photorefractive crystals employing digital holography. The holograms formed in a Mach-Zehnder interferometer are recorded by a two-dimensional CCD camera. From these holograms, the phase differences, which contain the information of the index changes in photorefractive crystals, are determined by utilizing digital holographic interferometry. Then the two-dimensional visualizations of index changes in the crystals can be obtained. This method is successfully demonstrated in LiNbO3:Fe, KNSBN:Ce and SBN:Cr crystals.     

Experimental Observation on Orientation Relationship between Binary Cd5.7Yb Quasicrystal and its Crystalline Approximant Cd6Yb

Similarity in the electron diffraction patterns of the Cd5.7 Yb icosahedral quasicrystal and its cubic approximant Cd6 Yb crystal is studied in detail by using transmission electron microscopy. The icosahedral twofold axes are parallel to the cubic （1ττ^2） （τ= 1.618…） or （0 0 1） directions, the icosahedral pseudo-twofold axes are parallel to the cubic （15 21 25） directions, the icosahedral threefold axes are parallel to the cubic 〈1 1 1〉 and the icosahedral fivefold are parallel to the cubic 〈0 1 τ〉 directions. Based on those observations a general stereographic projection is given to illustrate the exact orientation relationship.     

Holographic storage scheme based on digital signal processing

In this paper, a holographic storage scheme for multimedia data storage and retrieval based on the digital signal processing (DSP) is designed. A communication model for holographic storage system is obtained on the analogy of traditional communication system. Many characteristics of holographic storage are embodied in the communication model. Then some new methods of DSP including two-dimensional (2-D) shifting interleaving, encoding and decoding of modulation-array (MA) code and method of soft-decision, etc. are proposed and employed in the system. From the results of experiments it can be seen that those measures can effectively reduce the influence of noise. A segment of multimedia data, including video and audio data, is retrieved successfully after holographic storage by using those techniques.     

Particle Transport with Asymmetric Unbiased Forces and Entropic Barrier

Transport of a Brownian particle moving along the axis of a three-dimensional （313） symmetric and periodic tube is investigated in the presence of asymmetric unbiased forces. It is found that in the presence of entropic barrier, the asymmetry of the unbiased forces is a way of inducing a net particle current. The particle current is a peaked function of temperature, which indicates that the thermal noise may facilitate the transport even in the presence of entropic barrier. There exists an optimized radius at the bottleneck at which the particle current takes its maximum value. The current can be influenced by the slope of tube walls and there exists an optimized slope for which the particle current takes its maximum value.