选择性

The elaboration of systems that are able to mimic those enzymes should provide very important tools for three main purposes:(1) the development of new catalysts for important reactions in industrial and fine chemistry, such as the selective oxidation of alkanes and the stereoselective epoxidation of alkenes;(2) the prediction of the oxidative metabolism of new biologically active molecules such as drugs.(3) mimetic peroxidase of high catalytical activity and selectively is very important in bio-analytical field.

建立一系列关于这些酶的模拟体系将为以下三个方面的研究工作提供非常重要的工具：（1）工业或者精细化工方面重要反应新型催化剂的开发，例如烷烃的选择性氧化以及具有立体选择性的烯烃环氧化；（2）新的生物活性物质，例如药物的氧化机理的研究和预测；（3）具有合适底物的高活性过氧化物酶模拟酶在生化分析领域的前景。

For bulk lamella-forming diblock copolymers, perpendicular lamellae and concentric lamellae spontaneously form under the neutral and strongly preferential surface, respectively. When the surface preference is relatively weak, novel structures such as parallel lamellae, helices and catenarian structures are observed.

对体相形成层状相的双嵌段共聚物，我们发现在中性孔壁下共聚物自组装形成垂直于孔壁的垂直层结构，在强选择性孔壁下形成一系列的同心层结构，而在弱选择性孔壁下形成平行于孔轴的平行层、螺旋和链节等新奇结构。

X6 3?,large specific surface area and adsorbent capacity However,most molecules and hydrated ions can not enter the aperture pass because of their size over the aperture diameter of palygorslote except less simple ones Furthermore,Palygorskite adsorbs water molecule choosingly In most cases the absorbing of palygorskite is by its outside surface that works in the form of colloid and ion exchange other than i...

但是由于凹凸棒石孔道直径小于大多数分子及水合离子的直径，除少数简单分子和离子外，多数分子和离子都不能进入凹凸棒石孔道，而且凹凸棒石选择性吸附水分子，因而在多数情况下，凹凸棒石对吸附质的吸附不是内表面吸附，而是外表面吸附。并且外表面吸附是胶体和离子交换吸附。本文阐述了凹凸棒石的孔道直径、吸附选择性、体系pH 值及凹凸棒石和蒙脱石胶体颗粒的互相作用对凹凸棒石吸附性能应用的制约。

The technics of phosphotungstic acid adsorbed on carbon indicated circumfluence adsorption Technic was better than others.

对不同杂多酸的催化活性和选择性的研究表明：磷钨酸催化效果最好，酯化率达82%，MCT的选择性为68%。

The flotation effect of BET was compared with that of the commonly used reagents GF and FS202. The result shows that although the usage of BET is only 1/10 and 1/100 of GF and FS202 respectively, the collectability and selectivity for pyrite and coal gangue is obviously better than that of using GF and FS202. In addition, it will not be influen...

结果表明：尽管 BET的用量分别是 GF，FS2 0 2用量的 1 /1 0和 1 /1 0 0 ，但对黄铁矿、煤矸石等捕收性和选择性明显优于 GF，FS2 0 2 ，且不受 p H条件的影响；与其它 3种同系物(AET，DET，HET)在脱硫降灰方面综合比较表明，BET的效果最好，具有用量少、选择性强等优点，是一种应用前景良好的煤炭浮选药剂。

The solvent selectivity was divided into two parts: the partial combinatory solvent selectivity and the residue solvent selectivity.

通过研究发现，在大多数情况下部分组合选择性的作用一般比较小，在选择溶剂时，可以主要考虑部分剩余选择性。

The results suggested that essential oils of Salvia sclare, Cinnamomum cassia, Cymbopogon citrates were potential for the reduction of oviposition. Their non-selective oviposition deterrent rates ODR(superscript n were higher than 90%, while their selective oviposition deterrent rates ODR(superscript s were higher than 80%.

结果表明，香紫苏油、肉桂油和香茅油对荔枝蒂蛀虫有很好的产卵驱避效果，其非选择性产卵驱避率ODR(下标 n达90%以上；而选择性产卵驱避率ODR(下标 s达80%以上。

Methods: Denticulate ligament was observed and measured on 30 adult specimens.

目的 ：为临床选择性脊神经后根切断术和选择性脊神经前根切断术的开展提供齿状韧带的形态学依据。

In the forth part of the dissertation, based on the mechanism of classical Strecker reaction,we developeda new method for the asymmetric synthesis of the α,α-disubstituted amino acid, and applied it to theasymmetric synthesis of-αM4CPG, compound 11a and 11b.

在本论文的第四部分，我们从深入分析经典的Strecker反应入手，发展了一条新的以酮为原料出发的立体选择性地合成α，α-双取代的光学纯的氨基酸的方法，并且利用该方法立体选择性地合成了化合物-αM4CPG，11a和11b。

The organoboron compounds in this paper are based on triarylboranes, boronic acids and boronic esters. The structure-property relationship and sensing mechanism are elucidated. Organoboron compounds as Lewis acid can be used as fluoride probe with high sensitivity and selectivity because they have a unique LUMO in which the π-conjugation is divergently extended through the vacant p-orbital of the boron atom. The complexation of the boron π-electron systems with fluoride ion would interrupt the π-conjugation extended through the boron atom, causing the change of photophysical properties.

介绍了基于三芳基硼化合物、硼酸和硼酸酯的有机硼化合物在氟离子检测中的应用，评述了这些化合物的结构和检测性能之间的关系，讨论了检测机理，即有机硼化合物中硼原子空的p轨道使其作为路易斯酸能够选择性地结合氟离子，硼原子与氟离子的结合破坏了硼中心与芳香取代基的p-π共轭，引起有机硼化合物光物理性质的变化，从而实现对氟离子的高选择性检测。

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％。