CF3CO和CF3C（O）O自由基分解反应理论研究

利用文献结果，用统计热力学和过渡态理论计算了ＣＦ３ＣＯ和ＣＦ３Ｃ（Ｏ）Ｏ自由基分解反应的热力学和动力学数据。计算结果表明，计算值与最新实验数据甚相符合，并据此判断，ＣＦ３ＣＯ和ＣＦ３Ｃ（Ｏ）Ｏ均很不稳定，不可能参加Ｏ３分解的循环催化反应。     

CARBONIZED FIBROUS RESIN AS A NEW SORBENT FOR SAMPLING POLYCYCLIC AROMATIC HYDROCARBONS (PAHS) IN AMBIENT AIR

1. INTRODUCTION When investigating contaminated sites it is often essential to determine specific pollutants in a large number of ambient air samples. Amongst these sites, polycylic aromatic hydrocarbons (PAHs) are a major class of compounds that hav…     

A FACTOR FROM GRANULOSA CELLS CAN STIMULATE OOCYTE TISSUE PLASMINOGEN ACTIVATOR ACTIVITY

Several studies indicate that substances synthesized by granulosa cells are capableof regulating oocyte activity. We have studied the effect of factors synthesized by gran-ulosa cells on tPA activity of denuded oocytes using a co- culture system. The resultsshow that an FSH- dependent factor(s) synthesized by granulosa cells (but not by theca-interstitial cells) is capable of stimulating tPA activity of denuded oocytes. This findingis important for understanding hormonal regulation of oocyte tPA activity by mediatorssynthesized in granulosa cells.     

含硫碳负离子的反应及其应用的研究 II: 固-液相转移催化共轭加成作用

亲核性的碳负离子与亲电性碳-碳重键的共轭加成反应是构成新碳-碳键的重要方法。某些α-亚磺酰基碳负离子虽然也能与α,β-不饱和酯进行共轭加成,但要有效地产生这类含硫碳负离子往往要用对潮气敏感的强碱性试剂,如氢化钠等。最近,我们报告了在固-液相转移催化条件下α-苯亚磺酰基乙酸甲酯(1)的碳负离子的     

Synthesis and Crystal Structure of 7α-[（R）-1-Hy droxyl-1-methyl-3-（ thien-2-yl）-propyl]-6,14-endoethanotetrahydrothebaine

1 INTRODUCTION Opioid analogues still remain important drugs for the relief of severe pain and morphine is still the drug of choice in such situations. For many years, the search for new centrally acting opioid deriva- tives with pain-relieving properties and without un- desired side effects, such as addiction, obstipation, etc., has been the goal of a large number of scien- tists[1-3]. Consequently, a wide variety of modifyca- tions of the well-known alkaloids morphine, codeine and thebai…     

Preparation of Co3O4 Nanofibers via an Electrospinning Technique

Thin PVA/cobalt acetate composite fibers were prepared by using sol-gel processing and electrospinning technique.After calcination of the above precursor fibers,Co3O4 nanofibers with a diameter of 50-150 nm could be successfully obtained.The fibers were characterized by SEM,FT-IR,WAXD,respectively.     

单边裂纹聚苯乙烯样品拉伸断裂过程的声发射

本文测定了单边裂纹聚苯乙烯(PS)样品在拉伸加载时的声发射以及声发射事件按幅度、脉宽、计数和位置的分布,实验证实,单边裂纹PS样品拉伸时的声发射来源于裂纹端部银纹区的变形、断裂和扩展,大部分总振铃计数由裂纹亚临界和失稳扩展引起,在重复加载时观察到PS声发射的Kaiser效应。     

Grignard试剂同6，6－二烷基富烯反应的研究

烯丙基卤化镁和环戊二烯基溴化镁同６，６－二烷基富烯分别进行富烯环外双键的加成和还原反应，生成的取代环戊二烯基负离子用（ＣｐＴｉＣｌ＿２）＿２Ｏ（Ｃｐ＝环戊二烯基）或ＴｉＣｌ４配合，合成通式为Ｃｐ（Ｃ＿５Ｈ＿１－ＣＲＲ￣１－ＣＨ＿２ＣＨ＝ＣＨ＿２）ＴｉＣｌ＿２和（Ｃ＿５Ｈ＿４ＣＨＲＲ￣１）＿２ＴｉＣｌ＿２的化合物。对烯丙基卤化镁、环戊二烯基溴化镁同富烯的反应机理进行了探讨。     

葛根素的荧光光谱研究及应用

在 p H8～ 9的水溶液中 ,葛根素有稳定的荧光 ,最佳激发波长与发射波长分别为 2 58nm和 471 nm。当葛根素浓度为 1 .0× 1 0 - 7～ 1 .0× 1 0 - 6mol/ L时 ,其荧光强度与浓度有良好的线性关系。据此以荧光光度法直接测定了葛根、注射液及葛根提取物中葛根素的含量 ,并以 HPL C法对同一样品进行了对照测定 ,取得满意结果     

PREPARATION OF PARTICLE SIZE NARROWLY DISTRIBUTED LOW-DENSITY STYRENE DIVINYLBENZENE COPOLYMER MICROBEADS

In view of the importance of dispersion agent, the amount of the crosslinking monomer andthe diluent in suspension polymerization for the production of particle size narrowly distributedIow-density styrene divinylbenzene copolymer microbeads (LDPS), their actions are preliminarilyinvestigated in this paper. Experimental results indicate that when both the gelatine and polyvinylalcohol (PVA) are used as dispersion agents, the better effect is achieved. DVB is helpful to theformation of the lower density fine particles, the proportion of the DVB/St should be between1:1～1.5:1. Compared with toluene, gasoline is the more effective diluent for the above target.