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A novel synthetic approach of 3,3'-azobis(6-amino-1,2,4,5-tetrazine) was firstly devised. Taking 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine as a primary material, DAAT was synthesized by high pressure ammonolysis and potassium permanganate oxidation. Compared with the four-step reaction in the literature, this new approach was reduced to two steps with a yield of 58.1%. The intermediate and DAAT were characterized by elemental analysis, IR and NMR spectra.

自行设计了3，3'-偶氮双(6-氨基-1，2，4，5-四嗪)新合成路线、采用3，5-双(3，5-二甲基吡唑-1-基)-1，2，4，5-四嗪为原料，由文献报道的4步反应缩减为2步，经高压氨解、高锰酸钾氧化合成了DAAT，总收率大幅提高，达到58.1%，并采用元素分析、红外光谱、核磁共振光谱等进行了结构表征。

Since the production of carbon nanotubes synthesized by arc-discharge method contains impurities such as carbon nano-particles, amorphism carbon and graphite fragment, several purification methods were used to purify carbon nanotubes. It is found that with oxidation method in air, we can easily get purified carbon nanotubes.

由于用电弧放电法合成出来的纳米碳管产物中除了有纳米碳管外，还含有一些纳米石墨颗粒、无定形碳和石墨碎片等，因此本文对用电弧放电法合成出的纳米碳管进行了多种方法、探索性的提纯研究，实验结果发现，利用大气氧化法对纳米碳管进行提纯效果好，设备简单，是一种方便实用的方法。

The results reveal that raw materials and oxidation conditions have influence on the properties of AMP.

结果表明：原料和工艺条件对水性中间相的性能有较大影响。

There is a large difference in Fe oxidation states of the amphibole between the directly measured and indirectly calculated methods.

应用这一方法直接测定了相互连生的一对闪石和辉石中Fe氧化态的定量值。

Hopefully they are now protected from further oxidation by the argon atmosphere inside the ampoule.

希望他们现在免遭进一步氧化，在充满氩气气氛安瓿内存。

Meanwhile,anatase form of TiO_2 thin films were prepared by anodic oxidation of titanium plates.

首先通过高温热解的方法合成了不同尺寸的CdSe量子点。

The results shows that the REE of Shuixigou Group came mostly from andesite and granite in the denudation zone,but did not originate from basalt.The pH values of the interlayer oxidation rock zone and the primary reduction rock zone are similar,and those of ore zone are lower than the other two zones.

伊犁盆地南缘乌库尔其地区流体和岩石的 pH值分布情况表明，层间氧化岩石带和原生还原岩石带的 pH值相似，而矿石带的 pH值偏低，这与在偏碱性条件下， REE和 U的络合物容易形成，并且 REE和 U的络合物随着 pH值的降低而迁移和沉淀富集是相吻合的。

Hydroxysteroid dehydrogenase/carbonyl reductase ( 3α-HSD/CR,EC 1.1.1.50 ) from Comamonas testosteroni is an inducible enzyme which catalyzes the oxidation of androsterone with NAD+ to form androstanedione and NADH. 3α-HSD/CR was a member of the SDRs family, whose crystal structure had been solved by X-ray diffraction in 2000. The structure of 3α-HSD/CR is a homodimer which shows a typical pattern of Rossmann-fold structure consisting of βαβ units, and reaveals similarity with other members upon the SDRs family.

中文摘要 3α-Hydroxysteroid dehydrogenase/carbonyl reductase ( 3α-HSD/CR，EC 1.1.1.50 )是从Comamonas testosteroni菌体中分离而来的诱发性酵素，利用NAD+为辅因子，将受质androsterone氧化成androstanedione并伴随NADH的生成而完成催化反应。3α-HSD/CR是属於SDRs家族成员之一，其立体结构已经在2000年利用X-ray晶体绕射所解出。3α-HSD/CR在结构上为一同源双聚体，并和其它家族成员一样具有βαβ二级结构所叠合组成的Rossmann-fold特徵。

Rate constants of oxidation reaction of anethole to anisaldehyde by Ceric Sulfate at different temperature(15-35℃)were measured.

制备茴香醛是用对甲氧基甲苯作为原料氧化合成茴香醛，[2，3]但近年石油化工原料价格猛涨，因而以我国广西盛产的茴香油为原料制备茴香醛的方法得以重视[4-9]。

The indirect selective electrochemical oxidation of anethole to anisaldehyde with Ce4+/Ce3+ as redox mediator system was studied in this thesis.

研究了以茴香脑为原料，用Ce4+/Ce3+为氧化还原媒质，选择性间接电氧化合成茴香醛。

Continuously improve the production mechanism, to provide customers with better quality products and services.

不断的完善生产机制，给客户提供更优质的产品及服务。

B:Yes, he was the very prize-winner in the court tennis ten years ago?

是的，他是十年前的世界网球冠军。