查询词典 substitution group

The analysis of 1H NMR showed that the succinyl group was successfully conjugated to the amino group of chitosan molecule, and the degree of substitution of Suc-Chi values increased with increasing succinic anhydride/amino mole ratio or reducing the molecular weight of chitosan.

利用壳聚糖和琥珀酰酐反应合成了N-琥珀酰壳聚糖，1H NMR分析表明通过反应可在壳聚糖的侧氨基引入亲水性的羧基，增加琥珀酰酐／氨基的摩尔投料比或者选择分子质量较小的壳聚糖，有利于提高N-琥珀酰壳聚糖的琥珀酰化度。

Methods 34 heroin addicts were equally divided into treatment group and control group.Based on substitution of Methadone decreasingly,the patients of treatment group were additionally treated with aerosl bioelectricity apparatus(which generates negative charge with 1×107/cm3),once a day,for 7 days.Each patient was inhaled negative charge for 120min.

对海洛因依赖者34例分为两组，在美沙酮替代递减治疗的同时，治疗组采用珠海产SQ-365型气溶胶生物电理疗仪，以发生1×107个/cm3的负电荷吸入120 min，每天1次，治疗7 d 后观察血、尿吗啡含量及临床症状。

Calcium sulfate cement in experiment group was resorbed completely at 9 weeks with the new bone substitution while fibrous tissue occupied the space of defect in the control group.

结果 骨组织形态学计量数据表明，3、6、9周时，实验组骨缺损中的新骨形成数据，包括类骨质表面、骨缺损中新骨体积均明显多于对照组。6、9周时，实验组骨矿化沉积率显著高于对照组。

Our results showed 1 The changes in trends of leaf traits response to the rainfall gradient differed either with species or with a specific trait; 2）The same trends were found at the functional group level, However, leaf traits for grasses tends to be less sensitive, then for forbs, and the legumes is the most sensitive functional group along the rainfall gradient, indicated that the Grass function group is quite strong to the soil moisture content tolerance, and which certainly explained to the local vegetation distribution and the substitution between species.

主要结论如下：1 叶片性状在降雨量梯度上的变化趋势在物种水平上表现出多样化的特点，性状的变化趋势是否有显著的格局取决于物种或特定性状。2 叶片性状对水分梯度的响应在功能群水平上表现出各自的特点，Grass功能群对水分梯度的响应敏感性较低，Forb居中，Legume表现出较强的敏感性，表明Grass功能群对水分的耐受性比较强，这在一定程度上解释了当地克氏针茅草原上目前以禾草类为主的现状，对物种之间的替代有一定的指示性。

The abnormal behaviour which happened in the nucleophilic substitution process of phenoxy propionic acid has been discovered. The mechanism has been proposed as an intramolecular nucleophilic substitution by neighboring group participation.

发现一系列芳氧丙酸化合物发生亲核取代反应的异常情况，推测可能是分子内邻基参与的亲核取代反应。

150 raccoon dogs are selected and divided into 1 grouP of comParisons and 4 grouP of exPerimental grouPs stochastically, each exPerimental grouP according to 25%, 50%, 75%, 100% levels with the Extruded-soybean substitution the fish meal.in control grouP .

膨化大豆是精选优质大豆，经过膨化工艺处理成各种营养物质，其营养学特点有：高热能、高蛋白、高消化率，含有丰富的维生素E和卵磷脂，是一种高能高蛋白饲料资源。

The results show that methyl group strengthens the electrostatic attractions, but reduces the H-bonds effect, while benzyl group can make both electrostatic and H-bond effects strong. The theoretical results are identical with the results of the collectors flotation tests. Collecting ability of the quaternary amine salts is better than that of dodecylamine and dodecyl bimethyl amine. The quaternary amine salt containing benzyl group performs best, and it is little affected by pH value. Substitution of N-containing polar group in amine collectors can impact the aluminosulicate minerals flotation.

研究结果表明：甲基的取代可增强阳离子的静电作用能力，同时，削弱它与矿物表面之间的氢键作用；苄基的取代不仅增强药剂的静电效应，而且增加氢键的结合能力；理论分析结果与浮选试验结果一致，季铵盐的浮选能力较伯胺与叔胺的强，连有苄基的季铵盐对铝硅酸盐矿物的捕收能力最强，且受pH值影响小。

As a result, it shows that one/ones is the most frequently used group of substitution proform in English nominal substitution. They can substitute not only the whole noun phrase but also the crucial word in a noun phrase, emphasizing a general reference. Mastering all these usages can help to improve the concise power of expression as well as English comprehension .

重点论述了替代词one/ones的语义特征，对比研究了替代词one和指代词it、以及替代词one/ones与另一组替代词that/those的用法区分，研究表明，one/ones是英语名词性替代中最常见的一组替代词，它们既能替代整个名次词组又能替代名词词组中心词，强调泛指意义，掌握它们的各种用法有利于培养言简意赅的英语表达能力、提高英语阅读理解力。

A brief review is given for the chlorization of organic compound with SOCl 2,especially, the chlorization of carboxylic acid,substitution of hydoxyl group,carbonyl group,methlyene group and C,N,S,P,Si atoms.

综述了氯化亚砜在有机合成中的氯化应用，重点介绍了使羧酸氯化、去羟基氯化、加成羰基氯化、使活性亚甲基氯化及取代C ，N ，S ，P ，Si等原子上基团氯化的反应原

The regularities of the substitution effects of the electron-pushing group and the electron- withdrawing group on the electronic structures and the related properties of the complexes, e.g. the energies and the compositions of some frontier molecular orbitals, the spectroscopy properties, the atomic net charge populations on main ligands, the coordination-bond lengths and the coordination-bond angles of the complexes, etc. have been investigated.

探讨供电子基团和拉电子基团在主配体上的取代对配合物的电子结构及相关性质，如配合物前沿分子轨道的能量、组成、光谱性质、原子的净电荷布居及配位键长键角等的影响规律。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。