缩并

We make chloroacetylaion to N-terminal of Asp, and then convert this compound to GD dipeptide by aminolysis. Followed the lipase -catalyzed peptide synthesis of RGD in aqueous water-miscible organic cosolvent is studied. We set up a new efficient reaction method to synthesize RGD tripeptide. The problem that peptide containing polar amino acid can not be synthesized readily in organic solvent was solved. We offer a new experimental proof for PPL-catalyzed peptide synthesis and make a more general analysis for the effect of some factors in theory.

采用氯乙酰基保护天冬氨酸，然后进行氨解生成GD二肽，利用猪胰脂肪酶催化合成RGD三肽，着重解决了亲水氨基酸/肽片段底物的溶解性与合成产率低的问题，建立了一种新的有效合成RGD三肽的反应模型，并探索解决了极性较强的氨基酸的酶促肽合成的问题，对脂肪酶催化合成肽的影响因素从理论上作了较全面的分析，为肽片段的缩合反应提供了一种新思路。

Reels come in a variety of types including retractable, portable, wheeled, and attachable -- which can be secured to the side of your house if you like.

辘开了形式多样种类包括缩放、便携式、轮胎、并扣押--可向担保方如果你喜欢你的房子。

We marvel at the balletic precision of the pit crews as a car zooms in andscreeches to a halt, tires smoking.

我们惊叹於芭蕾舞精度的维修站工作人员作为汽车缩放并尖叫声停止，轮胎吸烟。

Title compounds were synthesized by condensation of 3 benzylidene isochroman 4 one with 5 substituted 4 amino 3 mercap to 4 1,2,4 triazoles.

通过异色满酮－4的3－位苯亚甲基取代衍生物与4－氨基－3－巯基－1，2，4－三唑的缩合反应得异色满并［3，4－f］硫氮杂奥。

A novel method of deprotection of benzyl and benzylidene acetal groups with K/tBuNH2/tBuOH/THF/18-crown-6 system was discovered and investigated.

四、发现并开发了K/〓BuNH〓/〓BuOH/THF/18-crown-6体系脱苄基和缩苯甲醛的反应，提出了可能的反应机理。

According to the result, we believed that the reason resulted in the low sensitivity was that the marker residue compound MQCA structure has changed after conjugated with protein and the antibody induced by the conjugation could not recognize the free MQCA in the ci-ELISA. Therefore we designed some hapten which could reserve the marker residue structural speciality mostly. After synthesis route selection and optimum, the hapten 7-Hydroxymethyl-3-methyl-quinoxaline-2-carboxylic acid was synthesized, used 4-methyl-2-nitroaniline as the start material via six steps, such as oxidation cyclization, bromize reaction, hydrolysis, Beirut reaction, reduction, hydrolysis. This work established basis for producing the high affinity antibody and developing the sensitive ELISA residue detection method.

本论文认为导致ELISA检测灵敏度较低的原因，是残留标示物和蛋白偶联后的特征结构发生改变，诱导产生的抗体不能够对游离MQCA很好的识别，因此，本论文设计了能够最大化保留MQCA结构特征的系列半抗原结构，并对其合成路线进行了筛选和优化，最终以对甲基邻硝基苯胺为起始原料，经氧化环化、溴代、水解、Beirut缩合、还原、水解六步反应制备含羟甲基结构的MQCA衍生物7-羟基甲基-3-甲基-喹噁啉-2-羧酸，为制备对游离残留标示物高亲和力的抗体，高灵敏度的ELISA残留检测方法的建立奠定基础。

In the process of studying char combustion, the ash-enclosed-and-core-shrinkage model is put forward. The dynamics study of char including ash in coal for combustion circumstances in calciner in cement industry were carried out with the method of weigh-loss analysis and the relation between combustion rate and extent was also sought.

在进行煤的燃尽特性研究中，提出裹灰缩核模型，针对水泥分解炉的低温燃烧工况，采用失重分析法，进行了含灰煤焦的燃尽动力学研究，并探讨了有关燃烧速率、燃尽度之间的关系。

The new surfactant was synthesized from the main starting materials such as lauric acid, p-cresol, chlorosulphonic acid and ethylene diamine, by 5 classic reactions which are acyl chlorination, esterification, Fries rearrangement, sulfonation and condensation, with total yield of 58%.

作者以十二酸、对甲酚、氯磺酸、乙二胺等为主要原料，共采取了酰氯化、酯化、Fries重排、磺化和缩合等5步经典的单元反应，合成了该表面活性剂，总收率为58％，并探讨了各步反应的条件对收率的影响。

Because there exists a high randomness an easier weighted method is used to establish Grid-format data to approximately describe 3-D space topography, 3-D topography is constructed for Grid-format data by using OpenGL technology, and a free transform of the space curved surface is realized, including parallel move, zoom, circumgyrate. Simultaneously, an algorithm of random incision of 3-D space curved surface containing most six sides is provided, in comhination of geologic evolution, element.

由于存在很大的随机性，采用较为简单的加权方法来建立规则网格Grid格式数据体对三维空间地形进行近似描述，利用OpenGL技术构造Grid数据体三维地形，并对构造出的三维空间曲面进行平移、缩放、旋转等自由变换，提供最多6个切面对三维空间曲面进行任意切割的算法，结合地质演化需要，利用双缓存技术实现了地质要素三维曲面动态演化过程。

A novel planar chiral diferrocenylimine-diols 6 was synthesized by the condensation of R, S(subscript p-1-(2-diphenyl hydroxyl methyl) ferrocenylethylamine [R, S(subscript p-4] with phthaldehyde in anhydrous ethanol, and was crystallographically characterized.

通过R，S(下标 p-1-（2-二苯基羟甲基）二茂铁乙胺[R，S(下标 p-4]和对苯二甲醛在无水乙醇中的缩合反应合成了一种新型平面手性双二茂铁亚胺二醇化合物6，并经X-射线衍射分析它的晶体结构。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。