阴离子

In order to reflect the catalyst deactivation during the oxidative polymerization and difference of the reactivity between monomer,the oligomer soluble in water,and the oligomer unsoluble in water,a new heterogeneous kinetic model was proposed according to Flory statistical theory.It was found that the polymerization rate estimated by the new model was consistent with the calculated data.

根据DMP氧化聚合过程中催化剂随时间延长而逐渐失活，不同种类的苯氧阴离子活性不同以及非均相聚合特点，提出了水介质中DMP氧化聚合动力学模型，并采用多元非线形回归计算得到模型参数，采用模型计算得到的聚合速率与实验测定值一致，证明所提出模型的正确性。

Under the unsterilized conditions,solution culture experiments were conducted toinvestigate the influence of collection times and interfering factors on the determination oforganic acids in root exudates.

在非灭菌条件下，通过溶液培养试验研究了收集时间和干扰因子对根分泌物中有机酸分离和测定的影响，建立了用阴离子树脂消除干扰离子的方法。

In this dissertation, the efforts were focused on design and synthesis of chiral tmsymmetrical urea, cholic acid and heteroaromatic molecular tweezers and their molecular recognition as well as enantioselective recognition. A series of useful and creative results have been obtained.Three new types of chiral molecular tweezers containing unsymmetrically disubstituted urea unit, four new types of chiral molecular tweezers based on steroid cholic acid and one type of heteroaromatic molecular tweezers involving multiple hydrogen-bonding site have been designed and synthesized.

本文致力于新型手性不对称脲、胆甾和芳杂环类分子钳受体的设计合成及其对阴离子、中性分子和手性分子的识别及对映选择性识别性能研究，取得了一系列具有重要学术意义与应用前景的创新性结果。

Particularly, the neutral anion fluorescence chemical sensor uses cholic acid molecules as the molecule frame, and introduces a neutral thiourea or ureido to the positions of a 3 bit carbon atom and a 24 bit carbon atom to be used as a bonding unit; a fluorescence chemical functional group is introduced to the positions of the 3 bit carbon atom and the 24 bit carbon atom or to other positions and used as a signal unit, and then a neutral anion fluorescence chemical sensor is synthesized.

具体而言是以胆酸分子为分子骨架，在其3位碳原子和24位碳原子上引入中性硫脲或脲基，作为键合单元；在3位碳原子和24位碳原子上或其他位置引入具有荧光化学官能团，作为信号单元，合成中性阴离子荧光化学传感器。

A method for determination of eight monosaccharides and two uronic acids in polysaccharide and wood hemicellulose hydrolysate by high performance anion exchange chromatography with pulsed amperometric detection was established.

建立了高效阴离子交换－脉冲安培检测同时分离测定8种单糖和2种糖醛酸的分析方法。

And hydroxyl free radical in the methanol extract of Valeriana offeinalis L . ResultsThe half maximal inhibitory concentration(IC50) of sample on DPPH.

结果样品中活性物质对于DPPH自由基、超氧阴离子自由基、羟自由基等自由基半清除率浓度(IC50)分别为1.36，1.46和2.14 mg/ml。

Cerium can relieve the decrease of soluble protein content,the accumulation of O_2 -· and MDA in roots and leaves of Vallisneria asiatica under stress of Cu 2+.

铈能减缓铜毒害导致的亚洲苦草根叶可溶性蛋白含量的下降及超氧阴离子(O2-·)、丙二醛的累积。

In this experiment, we use different kind of solvent to extract Vitaceae plants to test of antioxidae, includes clean DPPH free radical, ferrous ions chelating effects, restrain producing superoxide anion, ferric reducing ability of plasma and anti-liver lipid peroxidation assay.

在利用不同溶媒萃取葡萄科植物评估抗乳癌细胞株MCF-7毒杀试验和抗氧化试验中，其包含清除DPPH自由基、螯合亚铁离子、抑制超氧阴离子之生成、还原三价铁离子能力测定及抗肝脂质过氧化等几项。

Weaky basic anion-exchange resin was used to isolate and purify fucoidan from kelp Laminaria japonica, and phenol-H2SO4 method was applied to determine total carbohydrates and the optimal processing condition.

对弱碱性阴离子交换树脂分离纯化海带岩藻聚糖硫酸酯的工艺条件进行了研究，并采用苯酚－硫酸法测定总糖浓度绘制解吸曲线，确定最佳样液的pH值和洗脱流速。

It is suggested that the tin species promote the formation of a network as for tin oxide xerogel, through which copper ions and anions migrate.

这告诉我们，锡物质能促进像氧化锡干凝胶那样的网络的形成，铜离子和阴离子就通过它迁移。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。