吡啶

A chiral phase transfer catalyst, N-benzyl quinine bromide, was synthesized from natural chiral compound. And 2,5-bimethyl-4-(3-nitrobenzene)-1,4-bihydrogenation pyridine-3--4-methyl formate (viz. nitrendipine) was synthesized by this chiral phase transfer catalysis, and characterized by elemental analysis, infrared spectrum,1H nuclear magnetic resornace, and X-ray single-crystal diffraction.Key words: ammonium; chiral phase transfer catalyser; crystal structure

通过对天然手性物质进行修饰合成手性相转移催化剂N-苄基溴化奎宁，并对目标分子2，5-二甲基-4-(3-硝基苯)-1，4-二氢吡啶-3-甲酸乙酯-5-甲酸甲酯进行不对称催化合成，并通过红外光谱和核磁共振氢谱对化合物进行了表征，用X射线单晶衍射法测定了该化合物的晶体结构。

Its synthetic strategies, structural characters, properties and applications to the self-assembly of rotaxane s and catenanes are reviewed.

详细描述了盒状主体缺π电子联吡啶大环CPQT的结构和性质，总结比较了它的各种制备方法，并对其与富π电子氢醌醚链衍生物自组装合成索烃、轮烷和准轮烷等方面的应用进行了综述

It could be observed that the [2] catenanes showed absorption maxima in 438. 0nm, 463. 0nm and 517. 0nm respectively, due to the interaction between calix [4] arenocrowns and the bipyridinium ring units.

另外，通过紫外-可见光谱，研究杯[4]并冠醚[2]索烃类化合物中的电子转移情况，发现组装后生成的杯[4]芳烃[2]索烃类化合物中，由于富电子的杯[4]芳烃冠醚和缺电子的联吡啶盐之间π-π堆积相互作用依次增强，它们分别在438.0nm，463.0nm，517.0nm的位置产生新的吸收峰。

The PY series crushers crushes by the change of the gap in the crushing cavity .

吡啶系列破碎的氦的改变破碎腔的差距。

Methods 120 cases were divided randomly into two groups by random number chart,control group received SASP and huangliansu,treatment group received huangqi jianzhong detortion,compared clinical efficiency and disease activity index after 30 days.

将120例溃疡性结肠炎患者按随机数字表法分为治疗组和对照组各60例，对照组采用口服柳氮磺胺吡啶和黄连素片，治疗组在对照组治疗基础上加用加味黄芪建中汤，治疗30天后比较临床疗效和疾病活动指数。

The structures of the isomers were assigned by using 2D NMR techniques such as gCOSY. Comparing to the eluates from the chromatographic column, the first band contains the m2, the second band contains the ml.

利用一维及二维核磁共振(2D NMR)技术，结合三元胺中吡啶环的磁屏蔽效应，对两个异构体在溶液中的结构进行了解析，对应于Dowex 50Wx 2柱色层分离的第一包带的H离子为n2(cmen的2位胺基与Cl处于邻位)：第二色带的阳离子为ml。

Endospores are formed within the cell, one in each parent cell, and are surrounded by a thick coat containing dipicolinic acid.

内生孢子是在细菌细胞内形成的，且每一个母细胞只形成一个，形成后被含有2，6吡啶二羧酸的厚壁所包围。

Th e tissues were immediately fixed by using one of the following fixatives for 24 hours before conventional tissue processing:(1)2.5%glutaraldehyde and 2%polyf ormaldehyde;(2)2.5%glutaraldehyde and 0.5%cetylpyridinum chloride to fix mainly the glycosaminoglycan;(3)2%OsO4 to fix the phospholipids (PH1);(4)4%OsO4 (PH2) and (5) 3%tannic acid.

取正常大鼠腹膜组织，分别以不同固定液固定：(1)2.5%戊二醛和2%多聚甲醛；(2)2.5%戊二醛和0.5%氯化十六烷基吡啶；(3)2%OsO4(PH1组)；(4)4%OsO4(PH2组)；(5)3%鞣酸。

Objective: To observe the efficacy and safety of total glucosides of paeonycombined with methotrexate and sulfasalazine on the treatment of ankylosing spondylitis.

目的：观察白芍总苷联合甲氨喋呤和柳氮磺吡啶治疗强直性脊柱炎疗效和安全性。

OBJECTIVE: To investigate the curative effect and side effect of total glucosides of paeony combined with methotrexate and sulfasalazine in the treatment of ankylosing spondylitis .

目的：观察白芍总苷联合甲氨蝶呤和柳氮磺胺吡啶治疗强直性脊柱炎的协同疗效作用及其毒副作用。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。