中间物

These have attracted wide interest in the last years because it represents a key intermediate of the synthesis of Cinchona alkaloids ; such as quinine and cinchonamine.

由於它们为许多重要且具有药效的金鸡钠生物碱，如奎宁和金鸡钠胺，合成时之关键中间物或先驱物，使得在最近几年来引发广泛的研究兴趣。

The hydroxyl groups were introduced to the surface of silicone rubber by O_2 cold plasma treatment,coatings made from chitosan were chemically bonded to silicone rubber via silane-glutaraldehyde molecules and proved by the results of surface composites analysis with X-ray photoelectron spectroscopy and attenuated total reflection fourier transform infrared spectroscopy.

用氧低温等离子体处理硅橡胶，在其表面引入羟基，然后利用硅烷偶联剂的硅烷反应，通过中间物戊二醛在硅橡胶表面制备了几丁聚糖涂层。X射线光电子能谱和衰减全反射傅立叶变换红外光谱测试证实在硅橡胶表面成功制备了几丁聚糖涂层，表面接触角测试表明几丁聚糖涂层明显提高了硅橡胶的亲水性

At lower temperature, the interaction between the Ir particles and the adsorbed ethoxyl species is not strong enough to abstract H atom from the nearby CH3 group, and thus acetaldehyde acts as the key intermediate. Acetaldehyde can decompose to methane and CO and/or convert to acetone through decarbonylation.

低温时Ir粒子与吸附的乙氧基的相互作用的强度不足以从-CH3基团中提取H原子，此时乙醛是关键的反应中间物，乙醛可以裂解生成甲烷和一氧化碳或脱羰基生成丙酮。

The acuteness and foresight of Lu Xun's thoughts, the exceptionality, paradox of his way of thinking, and fighting between ultimate and intermediate, between nothingness and being, which reflect his wisdom, doubtlessly have contemporary significance.

生逢千年之交的中国人正与一个独特的时代相遇，面对各种"终结"说，面对"永远"的消解和形而上的消解，鲁迅思想的犀利性、前瞻性，他思维方式的独异性、悖论性以及他在"终结"与"中间物"、"虚无"与"实有"之间所做的抗争和所表现的智慧正凸显出当代意义。

It is also an important intermediate of GLYCOLYSIS, being the immediate precursor of pyruvic acid.

它也是糖酵解过程中重要的中间物，是丙酮酸的直接前体，在乙醛酸循环中由草酰乙酸产生而合成葡萄糖。

Philosophy is something intermedia between theology and science.

罗素说：哲学是神学和科学的中间物。。

I contend that this Janus-faced relation with intermediary metabolism contributes to carcinogenesis; if proven, this finding would have important implications for public health, in that it would lend support to the idea that prevention of obesity, and caloric restriction and exercise could reduce the predisposition to cancer.

我认为对癌症发生产生作用的中间物代谢具有两面性关系；如果这一发现得到证明，那么它将对公众健康产生重要的深远意义，因为这一发现将支持预防肥胖、限制热量摄入和锻炼会减少易患癌症体质这一观点。

At present,the rate laws and reaction mechanisms of pyrite oxidation,pyrite and chalcopyrite formation,uraninite and magnetite dissolution in aqueous solutions are mainly studied,and it is discovered that (1)oxidation rate of pyrite controlled by surface reaction assume fractional dependence on Fe3+ and O2 molalities in acid solutions;(2)Pyrite cannot nucleate directly from solutions below 300 ℃,it can only form initially through sulfidation of a FeS precursor. The rate equation of reaction between FeS and H2S to form pyrite is of the second order;(3)Chalcopyrite is formed by reactions of pyrrhotite or pyrite with Cu2+,the former proceeds via a series of mediate metastable phases of Cu-Fe sulfide,whereas the rate equation of the latter is apparently of the first order which is controlled by surface reaction;(4)The nonlinear behavior of magnetite dissolution at acid pH can be represented by a shrinking core model coupling with surface reaction and diffusion transport.

目前主要研究了水溶液中黄铁矿氧化、黄铁矿和黄铜矿形成、晶质铀矿和磁铁矿溶解的速率定律和反应机理，发现：(1)酸性溶液中黄铁矿的氧化速率对Fe3+和O2浓度呈分数依赖并受表面反应的控制；(2)低于300 ℃时黄铁矿不能从溶液中直接成核，而需初始地通过FeS先驱物的硫化生成，FeS与H2S反应形成黄铁矿的速率方程为二级；(3)磁黄铁矿或黄铁矿与Cu2+反应均可形成黄铜矿，前者经历了一系列准稳的Cu-Fe硫化物的中间物，后者的速率方程为表观一级并受表面反应的控制；(4)酸性pH时磁铁矿的非线性溶解行为可采用表面反应扩散输运耦合的收缩核模型来描述。

These compounds are of substantial interest both inviewpoints of theory and practical applications, mainlyunder the stimulus to achieve synthetic models either foractive sites of iron-sulfur proteins or for transitionmetal catalysts. This thesis describes the synthesis, structures andconformations of 51 new iron-sulfur cluster complexes,which have been characterized by elemental analysis andstandard spectroscopic methods. In addition, single-crystalX-ray diffraction analyses were performed for 4 representa-tive new compounds. Reactivities of μ-〓 with mono- and di- Grig-nard reagents derived intermediates toward various organicelectrophilic substrates were studied, along with complexa-tion of arynyl-containing iron-sulfur clusters by 〓Thus, several bridged, non-bridged, monomeric, dimeric,homonuclear, heteronuclear iron-sullfur and iron-sulfur co-balt-carbon cluster complexes were synthesized. A novelreaction and convenient route for the synthesis in highyield of tetranuclear iron complexes 〓 containing atetracoordinated sulfur atom was discovered, whereas aplausible mechanism based on experimental results was propo-sed for the formation of the new cluster type.

鉴于有机铁硫原子簇化学在基础理论发展和应用方面的重要意义，因此我们开展了这一课题的研究，并取得以下主要成果： 1、本文共合成了51个新有机铁硫及含钴碳簇基的有机铁硫原子簇配合物，除用元素分析，NMR，IR，MS法表征其结构和构象外，还用X-光衍射技术测得四个代表性配合物的单晶结构和构象； 2、我们业已发现炔基Grignard试剂同〓可形成一种&开环&与&闭环&中间物的平衡混合物，研究该平衡混合物同各种亲电试剂的反应； 3、研究发现了一种可高产率地形成〓含〓四配位硫挛合簇的新化学反应并对此反应提出了—种有趣的反应机理； 4、首次由1，4-二溴丁烷双Grignard试剂与〓制得一种新型铁硫簇双硫阴离子活性中间体，并进而研究了它的亲核反应性能； 5、找到了通过〓的光化学反应来合成簇合物〓-〓的一条有实用价值的新路线。

We want to buy Flywheels, Air Compressor Parts, Intermediate Rings, Engine Mountings and Other Engine and Chassis Parts Compressors and allied Equipment

我们要采购调速轮，空气压缩物配件，中间物戒指，发动机架设和其他的发动机和底盘配件压缩物和有关设备

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。