假蒟挥发油化学成分气质联用分析研究

采用常规水蒸气蒸馏法提取出假岛精油，经气相色谱-质谱联机分析，分出60多个峰，鉴定出67种化合物，它们主要是2，4，5-三甲氧基-1-丙烯基苯3．20％），顺-石竹烯（13．33％），1，2-二甲氧基-4-（1-丙烯基）苯（12．63％），细辛（9．94％），4-甲氧基-6-（2-丙烯基）-1，3-苯并二恶茂（5．71％），δ-杜松烯（3．03％）etc，占总峰面积的67．84％。     

聚丙烯酸甲酯载体对柱状假丝酵母脂肪酶固定化的研究（Ⅰ）

合成了一系列不同结构的聚丙烯酸甲酯，考察了它们的固定化酵母脂肪酶催化酯水解反应的效果，得到了载体孔结构对固定化效果影响的一些规律．研究了最佳吸附条件，比较ｐＨ和离子强度对酵母脂肪酶自由酶和固定化酶催化酯水解反应活力的影响．     

VINYL MONOMERS BEARING CHROMOPHORE MOIETIES AND THEIR POLYMERS——Ⅹ.INITIATION AND PHOTOCHEMICAL PROPERTIES OF p-(N,N-DIMETHYLAMINO)STYRENE AND ITS POLYMERS*

A vinyl monomer having an electron-donating moiety, p-(N,N-dimethylamino)styrenc (DMAS),was synthesized. It was combined with benzoyl peroxide (BPO) to form a redox initiation system to initiatethe polymerization of methyl methacrylate (MMA). UV spectra measurements show that DMAS enters thePMMA chain as well. Both DMAS and its polymer P(DMAS) display strong fluorescence, and thefluorescence can be quenched by electron-deficient compounds such as methacrylonitrile, fumaronitrile andmethyl methacrylate etc. Moreover, DMAS can also form charge transfer complex (CTC) with strongelectron acceptors such as tetracyanoethylene (TCNE). The difference between the photochemical propertiesof DMAS and P(DMAS) were explained in terms of molecular structure change and polymer conformationeffect in solution. In addition, the CTC and exciplex formation of DMAS or P(DMAS) with C_(60) were alsostudied.     

苏云金芽孢杆菌杀虫基因导入中国栽培水稻品种中花11号获得转基因植株

在水稻的遗传转化中,迄今尚未见到将优良性状基因导入生产推广品种并获得转基因植株的报道。我们首次将B.t.杀虫基因导入到生产推广品种中花11号中,并建立了一套转导外源DNA的有效方法。应用剪掉内颖,同时去掉柱头保留完整外颖的方法可使种子结实率提高到50％。遗传转化植株经分子杂交实验室证实,B.t.杀虫基因已整合到水稻基因组中,得到了转杀虫基因水稻工程植株。用Jefferson的组织化学法测定转基因植株的β-glucuronidase的活性,与B.t.杀虫基因形成翻译融合的GUS基因得到了表达,这为B.t.杀虫基因在转基因水稻植株中的表达提供了证据。     

气相色谱手性衍生化试剂N－七氟丁酰基－L－脯氨酰氯的合成与应用

 合成了用于气相色谱（ＧＣ）的手性衍生化试剂Ｎ－七氟丁酰基－Ｌ－脯氨酰氯（Ｎ－ＨＦＢ－Ｌ－ＰＣｌ）。各种特性试验表明，Ｎ－ＨＦＢ－Ｌ－ＰＣｌ是灵敏的ＧＣ手性衍生化试剂，可直接于水相拆分微量的手性胺对映体。     

用气相色谱、气相色谱－质谱对萘普生重要中间体6－甲氧基－2－乙酰萘合成反应的研究

 在优良抗风湿药物萘普生的重要中间体６－甲氧基－２－乙酰素的合成中存在溶剂硝基苯的毒性及所带来的污染。而改用二氯乙烷作溶剂，只加少量硝基苯即可。为配合合成工艺的优化，用气相色谱（ＧＣ）、气相色谱－质谱（ＧＣ／ＭＳ）对反应产物、副产物及多个杂质进行了定性分析研究，并在５％ＯＶ－１０１ＣｈｒｏｍｏｓｏｒｂＷＡＷＤＭＣＳ柱上完成了产物的内标定量分析。从而减少了副反应和高沸点杂质的生成，最终生产出了９５％以上含量的６－甲氧基－２－乙酰萘产品，收率达到６０％。     

New Advances in Catalytic Systems for Conversion of CH_4 and CO_2

One of the main goals for developing the C1 chemical industry is the direct conversion of methane and carbon dioxide to useful products. To realize this goal, researches on new catalytic systems are being globally focused. The exploration has been evolved from traditional heterogeneous catalysis into homogeneous catalysis. Coordinate complexes, biochemical and bionics, and photo- and electrochemical catalysis have been extensively studied in recent years. Tests in laboratories have verified for the direct conversion of CH4 to CH3OH that single-pass converstion of CH4 can reach over 70% in both Hg(II) salt and Pt(II) complex systems. The main problem of these systems is the obstacles involving reaction kinetics, so they must be solved before moving to pilot tests. Other catalytic systems discussed in the present article include explorations in the early stage. Among them, features of photo and enzymatic catalyst systems, such as mild reaction conditions, better selectivity and environmentally friendliness     

急性力竭运动对大鼠下丘脑氨基酸神经递质的影响

用激光诱导荧光检测的高效毛细管电泳结合微透析技术测定急性力竭运动前后的大鼠下丘脑区细胞外液中的氨基酸神经递质的含量. 实验结果表明, 急性力竭运动后大鼠下丘脑区的细胞外液中的6种氨基酸(精氨酸、甘氨酸、赖氨酸、谷氨酸、丙氨酸、γ-氨基丁酸)有统计意义的增加, 这一结果显示了下丘脑区的氨基酸在应激过程中很可能起着重要的作用.      

以混合价镍氢氧化物为镍源固气合成LiNi0.7Co0.25Al0.05O2

层状LiCoO2作为锂离子二次电池电极正极材料已得到广泛应用。由于钴资源匮乏及成本高,致使进一步提高比容量和比能量以及降低成本的研究引起关注。诸如LiCoO2体材中钴被M(N i,Mn,Ti,Mg)替代或部分被替代的研究[1-3],表面修饰研究[4-6],合成方法研究如固相法[7],溶胶凝胶法[8],共沉淀法[9],微波加热合成法[10]等。与钴相比,镍资源相对丰富且对环境友好,故以镍代钴合成LiCo1-xN ixO2的研究成为热点[11-13]。由于N i2 难以被氧化成N i3 致使合成时易生成非化学计量化合物,加之在充放电过程中,由于Li 离子与N i3 离子半径相近易产生阳离…     

Fast electron transfer repair of oxidizing OH adduct of dGMP by chlorogenic acid

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