吡啶基

Dimethylamino)ethyl methacrylate was polymerized using PS-CH_2Cl as macroinitiator and CuCl/ 2,2 '-Bipyridyl as catalyst in toluene to acquire amphiphilic brush-type copolymers of PS-g-PDMAEMA.

再以氯甲基化的聚苯乙烯(PS-CH_2Cl)为大分子引发剂，在CuCl和2，2′-联吡啶(2，2′-Bipyridyl，bpy)存在下，以甲苯为溶剂，进行甲基丙烯酸N，N-二甲胺基乙酯2-(Dimethylaminoethyl methacrylate，DMAEMA的ATRP聚合，得到两亲性的梳状共聚物PS-g-PDMAEMA。

When Gluma is applied in vivo, two reactions occur: first, GA reacts with part of the serum albumin in dentinal fluid, which induces a precipitation of serum albumin; and, second, the reaction of GA with serum albumin forms dihydropyridinium, whose disproportionation gives rise to free radicals, and the free radicals induce the polymerization of HEMA.

首次提出Gluma的脱敏机理为：当Gluma涂在过敏的牙本质上时，首先戊二醛交联牙本质液中的血清蛋白并产生沉淀；同时戊二醛与血清蛋白的反应产生二氢吡啶盐，它发生歧化反应，歧化过程中会有自由基产生，从而引发HEMA 聚合，生成另外一部分沉淀，这两部分沉淀共同堵住牙本质小管，起到了脱敏作用。

The pyridine hemochrome spectrum indicated the presence of protoheme Ⅸ as the prosthetic group.

吡啶血色素光谱显示了酶分子以原卟啉Ⅸ作为辅基。

Methods The effects of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine and 7-nitroindazole (7-NI) on nitric oxide synthase activity, levels of dopamine、3,4-dihydroxyphenylacetic acid、homovanillic acid, and TH-immunostained postive nerve fibres in the striatum of mice were determined by using colorimetic analysis, HPLC with electrochemical detection, and immunohistochemical analysis.

用比色分析、高效液相色谱电化学及免疫组化法检测1-甲基-4-苯基-四氢吡啶和7-硝基吲唑（7-NI）对C57BL小鼠纹状体一氧化氮合酶活性，多巴胺、二羟基苯乙酸、高香草酸水平和酪氨酸羟化酶免疫阳性神经纤维的影响。

Tetrachloroterephthalic acid was prepared by chlorinating terephthalic acid, oleumsolvent and iodine catalyst. Tetrachloroterephthalic acid was acylated by sulphurous oxychloride in the presence of DMF to form tetrachloroterephthaloyl chloride. The acyl chloride product was fluorinated by potassium fluoride and esterified by methanol to synthesize dimethyl tetrafluoroterephthalate. The ester was reduced with potassium borohydride and lithium chloride to give tetrafluoroterephthalyl alcohol. The above product was bromated in the hydrobromic acid to obtain 4-bromomethyl-2,3,5,6-tetrafluoro-benzene methanol. 4-Methyl-2,3,5,-6-tetrafluorobenzene ethanol was obtained by reducing the bromide with magnesium. In the exist of DCC and DMAP, tefluthrin was got by the condensation reaction between 4-methyl-2,3,5,6-tetrafluoro-benzene methanol and-(1RS,3RS)- 3-(2- chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cycolpropanecar-boxylate acid.

对苯二甲酸与氯气在碘存在下以发烟硫酸为溶剂进行氯化制备四氯对苯二甲酸；再以DMF为催化剂与二氯亚砜反应生成四氯对苯二甲酰氯；以氟化钾为氟化剂，环丁砜为溶剂置换氟化，再与甲醇酯化得到四氟对苯二甲酸甲酯；以KBH4-LiCl为还原剂二甲醚为溶剂反应制得四氟对苯二甲基苄醇；以氯苯为溶剂在溴化氢溶液中溴化得到溴化产物；在乙醇溶液中经镁粉还原得到4-甲基-2，3，5，6-四氟苄醇；甲基苄醇与功夫酸在催化剂二环己基碳二亚胺和4-二甲氨基吡啶作用下缩合得到七氟菊酯，总收率达43.6%。

The effects of reaction time, mole ratio of reactants and amount of catalyst on yield of ketal were investigated by using the [SO3H-bPy] [H2PO4] ionic liquid as catalyst. Results show that the ionic liquid was an efficient catalyst for the ketalization with high conversion and selectivity in mild conditions.

以磺酸基功能化的吡啶磷酸类离子液体[SO3H-bPy][H2PO4]为催化剂，系统考察了反应时间、酮与醇的配比、催化剂的用量及催化剂重复使用、不同阴离子、阳离子等因素对反应的影响，优化了反应条件。

ATRP initiation systems consist of organic chloride initiators (RCl, RBr or aryl sulfonyl chloride, etc.), transition-metal catalysts in lower oxidation state Cu(I, Fe, Ru, Ni, etc. and organic electronic-donating ligands (2,2'-bipyridine―bipy or bpy, PPh3, multidentate ligand compound 1,1,4,7,7-pentamethyldiethylenetriamine, etc.).

普通ATRP引发体系包括引发剂主要为氯或溴化物，芳基磺酰氯；低价过渡金属卤化物如Cu， Fe，Ru，Ni等；有机配体如2，2'-联吡啶，PPh3，脂肪族多元胺等。

In pH=2.0 sulfuric acid solution, 2,2′bipyridine, an almost nonluminescent compound was transformed into a highly fluorescent compound (λex=340 nm,λem=430 nm) when attacked by ·OH generated by Fenton reaction.

在酸性介质中，Fenton反应产生的羟基自由基能将几乎无荧光的2，2′-联吡啶氧化成强荧光物质，羟基化产物的最大激发和发射波长分别是340 nm和430 nm。

1M of iodide was optimized parameter of electrolyte in this research. Furthermore, the TiO2 film gave a higher conversion efficiency than the TiO2 film nontreated by 4-tertbutylpyridine, which increased 13% by surface treatment with 4-tertbutylpyridine.

在碘浓度为0.1M时为此实验电解液之最佳参数，另外TiO2薄膜电极通过4-叔丁基吡啶的处理，染料敏化太阳能电池之转换效率较未处理电极高出了13%。

A pentacarbonyl complex (3) isolatedfrom the same reaction from which the complex (1) is obtained, whose accuratestructure is yet known, is preliminarily studied.

对从含吡啶基团的二硫醇三齿配体与Fe_3_(12)的反应中得到的另一个准确结构有待确定的五羰基化合物(3)进行了初步的性质研究及表征。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。