查询词典 selectivity

From the point of ion exchange and chelating ,the high adsorption selectivity was investigated by the peculary structure of amidoxime fiber(combined with crosslinking structure and the maximal conversion of cyano) and Au ion.

从离子交换和螯合吸附的角度，根据偕胺肟基纤维本身的交联结构和最大氰基转化特点以及金离子本身的结构特点对其高选择吸附性能进行了解析。

The effect of gold nanoparticles on the resolution and selectivity of separation was investigated. The influence of separation voltage, pH and buffer concentration on the separation of aminobenzoic acids was also examined.

探讨了修饰金纳米浓度、修饰时间以及缓冲溶液加入一定浓度的金纳米对三种氨基苯甲酸分离和测定的影响，优化了分离电压、酸度以及缓冲溶液浓度等实验条件。

Both primary and secondary amines were readily aminolysized, but secondary amine gave relatively low yield. It appeared that the aminolysis had good selectivity since the intermediate Ⅲwas more readily attacked by N-nucleophiles than by 0- nucleophiles.

实验发现，芳香胺和非芳香胺均可获得良好的反应结果，但芳香胺所需的反应时间较长；伯胺和仲胺都是良好的胺解试剂，但使用仲胺时产率较低；N原子亲核试剂比O原子亲核试剂具有更大的反应性。

The results showed that adequate propionic anhydrate concentration (propionic anhydrate to menthol at molarratio of 1:1), proper enzyme amount and low water activity (water activity below 0.63) can increase selectivity of enzymatic reaction and improve resolution of menthol in ionic liquids.

结果发现，适量的丙酸酐浓度(丙酸酐和薄荷醇物质量比为1：1)、合适的酶量100 U·ml~(-1和较低的水活度(水活度小于0.63)有助于提高催化反应的选择性，改善酶在离子液体中对薄荷醇的拆分效果。

The proposed method has a good sensitivity and selectivity and has been applied to the determination of anionic surfactant in water samples with satisfactory results.

方法具有较高的灵敏度和良好的选择性，用于不同水样中AS的测定，结果满意。

The develop-ment of ligands expands the scope of substrates, improves reaction selectivity and realizes the amination of the cheaper and available aryl chlorides. The application of weak base improves the compatibility of functional groups. Pd-catalyzed amination of aryl halides are used in the synthesis of arylamine.

配体的发展扩展了底物的适用范围，提高了反应的选择性，实现了廉价易得的氯代芳烃的胺化，弱碱的使用提高了官能团的兼容性，因此Pd催化芳胺化广泛应用于合成芳胺类化合物。

The selectivity of cyclization of carbodiimide 2 with primary amine was studied and the result showed that the anomalous product being cyclized from arylamino group was formed preferencially.

研究了碳二亚胺2与伯胺成环反应的选择性，结果表明优先生成反常的芳氨基成环产物，利用中间体可能的构型解释了实验结果。

The results showed that aspartic acid can greatly improve the selectivity of titanium dioxide for phosphopeptide enrichment.

结果表明，天冬氨酸可以有效地提高二氧化钛对磷酸肽富集的选择性。

From the results, it seems that this new macrocyclic ligand is able to bind three different amino acids with selectivity in aqueous solution, and the strength of binding is of the order lysine＜glycine＜aspartic acid.

通过合成金属配合物，在结构和功能上模拟生物酶的活性中心或结构中心是研究酶的结构与活性关系的重要手段，也是生物无机化学的一个主要研究方向。

One of the major problems,however,remains the poor solubility and membrane permeation of pepstatin, as well as its lack of selectivity among aspartyl proteases.The amino acid statine can mimic the tetrahedral transition-state of amide bond hydrolysis but cannot itself be hydrolyzed by the enzyme.

分子中含有两个非天然氨基酸statine能模拟天冬氨酸蛋白酶底物活性部位的四面体水解过渡态，且本身不易被切割，通过氢键和酶的天冬氨酸残基结合。

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％。