选择性的

It was found that the more easily systhesized and stable N, N-acetal or N, Ohemiacetal can replace N-tosyl imino ester to react with phenols in the presence of TiCl〓, and α-arylglycine derivatives were also obtained in high yields and high regioselectivity.

进一步研究发现，更易合成的N，N-或N，O-缩醛可以作为亚胺酯的替代物和酚类化合物发生傅克反应。路易酸TiCl〓能有效地促进酚类化合物和亚胺酯的傅克反应较高产率、较高区域选择性的得到2-羟基α-芳香甘氨酸衍生物。

The steoreselectiviy showed the E selectivity in most of cases and Z selectivity was presented in larger substituents like mesityl and 1-naphthyl.

进一步增大烯上的取代基则可以得到Z选择性的烯炔产物。利用如此的方式，也许还可以用来合成含烯炔的高分子。

The path module enables appropriately permissioned users to specify an optional alias in all node input and editing forms, and provides an interface to view and edit all URL aliases.

path 模组可以让有权限的使用者在所有的文章输入与编辑表单中，指定一个选择性的别名，显示且提供一个介面来检视与编辑所有的网址别名。

New methods for asymmetric synthesis of pinacol are reviewed, the catalytic effects and stereo- selectivity with various catalytic systems are discussed in this paper.

综述了近年来不同催化体系的不对称合成呐醇的方法，并总结了不同的催化效率和对映选择性的差异

In order to discuss the regioselectivity of nitrile oxide 1,3-dipolar cycloaddition to propyne , 1,3-dipolar cycloaddition reaction of substituted nitrile oxide (RCNO, R=F, NO2, OCH3, OH, COOCH3, CHO, CONH2, H, CH3) with propyne was studied using density functional theory at the 6-311++G** level, and the reaction rates were calculated at different temperature from 200 to 400 K.

用密度泛函B3LYP/6-311++G**方法研究了氧化腈(RCNO，R=F，NO2，OCH3，OH，COOCH3，CHO，CONH2，H，CH3)与丙炔的1，3-偶极环加成反应，并且计算了不同温度下的反应速率常数，讨论了氧化腈上不同取代基R的取代效应和温度对反应区域选择性的影响。

Because ouabain polyclonal antibody made blood pressure reduced for shorter time and possessed slightly allergy, we aimed to prepare a new depressor, ScFv, with high specificness by advanced phage display technique. The heavy-chain and kappa light-chain variable region gene repertoir of immunoglobin were amplified individually with heavy chain and light chain primers of Pharmacia Corporation and assembled into ScFv by a linker with overlap extension PCR.

针对哇巴因多克隆抗体存在的降压时间持续较短及存在轻微的过敏反应等缺点，本研究利用先进的噬菌体抗体库技术，拟研制开发一种具有高度选择性的降压新药--哇巴因单链抗体。

Experimental results showed that the hydrogenation degree can be enhanced significantly by the addition of triphenylphosphine. When the molar ratio of TPP, TPPTS and Ru is 2:5:1, 89% hydrogenation degree can be achieved after 12 h under reaction conditions of 5.0 MPa and 150~C.

考察了溶剂种类、水溶液的pH值、添加助剂三乙胺、水／有机两相体积、底物浓度等对对-氯硝基苯转化率和生成对-氯苯胺选择性的影响，并在90℃、4.0MPa、反应时间为6h的条件下，进行了催化剂的循环实验。

In this new strategy, selective glycosylation of indolecarbazole can be achieved using unprotected, unactivated glucose.

采用了新的糖苷化手段，可以使吲哚并咔唑直接与未保护和活化的葡萄糖作用选择性的生成β糖苷键，省略了糖的多步保护、脱保护过程，大大简化了操作。

In the process of bromotion of ester, it adopted high selective brominating agent , the yield exceeded 90% and the purity was above 95%.

在芳醚的溴化反应中，首次采用了高选择性的溴化剂，使溴化一步的收率超过90％，含量均在95％以上，具有很好的经济效益和应用前景。

PROF.: The first challenge to the old idea that a single DNA sequence encodes a

对旧的观点的第一个挑战是， DNA 序列编码蛋白质是选择性的连接的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。