选择性的

In chapter five, the heterocyclic compounds modified electrode for detection of lead has been discussed.

该修饰电极为创造高灵敏度高选择性的无汞测铅传感器提出了一个新的途径。

This paper has firstly reported heterogeneously catalyzed selective oxidationof toluene to benzaldehyde with molecular oxygen in liquid phase. It has beenfound that copper and iron oxides catalyst supported on ?

本论文提出采用多相催化剂，以分子氧为氧源，液相条件下的合成路线是提高目标产物选择性的有效途径之一。

The hilus of the hippocampus showed a significant loss of neurons

这些结果说明大脑半球左边的海马齿状回有选择性的神经元损失，加强运动有助于减少这种损失。

Chiral centers of C5 and C8 are directly constructed in the key step of the diastereoselective propargylation from D--tartrate. The methylation and subsequent methoxycarbonylation result in desymmetrization of the terminal dialkynes. The α,β-unsaturated δ-lactone is synthesized after partial hydrogenation and lactonization.

由非天然酒石酸出发，利用双向非对映选择性的炔丙基化反应，在一步反应中同时构建C5和C8手性中心；然后通过末端炔基的甲基化、甲酯基化，延长碳链并对分子去对称化；内酯化得到关键中间体α，β-不饱和六元内酯，再经多步反应转化得到8-epi--Boronolide。

Effects of sonic factors, including dosage of catalyst, calcination temperature of catalyst, nitrated reaction time and recovered catalyst, on the selectivity of toluene in mononitration at the presence of silicotungstic acid catalyst were studied by gas chromatography.

通过气相色谱研究了诸如催化剂用量、催化剂焙烧温度、硝化反应时间、硝化反应温度及催化剂的重复使用等因素对甲苯硝酸硝化区域选择性的影响。

Octylene was synthesized via tetramerization of ethylene at the presence of a catalyst system consisted of chromium acaet as primary catalyst, methylaluminoxane as cocatalyst, bis amine as ligand under high pressure. The effects of different PNP ligands on catalyst activity and selectivity to 1-octene were investigated.

在乙酰丙酮铬、甲基铝氧烷、配体三元催化体系中，以乙烯为原料在高压下齐聚生成1-辛烯，主要考察N原子上取代基不同的PNP配体对催化剂活性及1-辛烯选择性的影响。

In previous results, Alkyl substituted propargylic dithioacetals treating with butyl lithium then were allowed to react with carbonyl compounds to form homopropargylic alcohol with high yields and highly regioselective.

在本实验室先前的研究中发现，烷基取代炔丙基硫缩酮与正丁基锂进行开环反应后，若是与羰基化合物反应，能够以高产率、具位向选择性的生成高炔丙基醇。

The second part, we have developed a convenient and highly-regioselective approach to synthesis of trisubstituted iodofurans.

第二部分，我们发展出一个便利且具有高度位向选择性的方法来制备三取代碘化呋喃，由高炔丙基醇可以顺利的得到2，4，5-三取代碘化呋喃。

So there are ample opportunities to dole out selective punishment.

所以，他们有大把机会给不守规矩的公司一些选择性的惩罚措施。

The present invention is method of synthesizing high selectivity adsorbing material by means of molecular print technology and the advantages of silicon ball.

本方法是利用分子印迹技术和硅球内在的优点合成高选择性的吸附材料。

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％。