羧基的

Therefore esterification crosslinked reactionbetween polyearboxylic acid and wood can be quantitatively determined.According toexperiment results of stereoscopic configuration choices by crosslinking agents,crosslinkingreaction between model of reaction intermediate and wood,and the intermediate characteristic incrosslinking reaction,crosslinking reaction intermediate was proofed.We can infercrosslinking reactions between polycarboxylicacid and wood want through a mechanism of twosteps reaction process,the first cyclic anhydrides were formed as intermediates by dehydratingbetween hydroxyls in polycarboxylic acids,second esters were occurred by substitution reactionbetween wood hydroxyls and cyclic anhydrides.

从而可全面定量表征木材与多元羧酸类化合物的酯化交联反应；依据交联剂立体构型选择性、反应中间体模型物与木材的交联反应和交联反应中间体的波谱特征实验结果，证实了交联反应中间体，因此可以推测：多元羧酸类化合物与木材化学组分的交联反应是经历两步反应的机理，首先多元羧酸中相邻羧基的羟基之间脱水形成五元环酸酐中间体，然后木材的羟基与酸酐发生亲核取代反应形成酯。

The copper atom is in a planar coordination site of [N_2O_2] and it devites from the mean plane by only 0.80 pm. Byπ-πstacking interactions, a alabastrine structure was obtained.(2)Schiff-base complex [Cu(H_2O)]·H_2O, where H3GS is the 3-carboxyl -salicylidene glycine, was synthesized and characterized by elemental analysis, IR spectra and single-crystal analysis. The crystal belongs to monoclinic system, space group P2(1)/c, a=848.46(3)pm, b=681.54(3)pm, c=1967.16(8)pm,β=95.8210(10)°, Z=4, R_1=0.0279, wR_2=0.0724. The copper atom is in a square-pyramidal field with the base

结果表明该晶系属单斜晶系，空间群P2(1)/c，晶胞参数：a=848.46(3)pm，b=681.54(3)pm，c=1967.16(8)pm，α=90°，β=95.8210(10)°，γ=90°，Z=4，R_1=0.0279，wR_2=0.0724，Cu原子位于轻微变形的四方锥场底心，底面被氮原子、酚氧原子、甘氨酸羧基的一个氧原子和一个水分子氧原子占据，而甘氨酸羧基的另一个氧原子占据相邻分子的锥顶，因而形成一维链状结构；合成了单核双聚配合物Na_2[Cu_2_2]·2H_2O ，铜三核配合物Cu_3_2·5H_2O和铜锌异三核配合物ZnCu_2_2·5H_2O，并用元素分析，IR光谱，电子光谱和磁化率测定对配合物的组

Poly-[N-(2-hydroxyethyl)-L-glutamine] was then obtained by aminolysis of PBLG with 2-aminoethanol.

以L -谷氨酸为单体，经r -羧基的苄基保护，与光气/甲苯液反应制备L-谷氨酸苄酯的羧酸酐，均聚得L -谷氨酸苄酯，然后经由 2 -氨基乙醇胺解得聚 [N -( 2 -羟乙基)-L -谷酰胺 ] 。

Crystal by DTT into the protoxin with an end amino group; activation and derivation of abamectin to form abamectin-COONa with a carboxylic group; final bioconjugation by using amino-carboxylic conjugator EDC to achieve the substance combination of two biotoxins.

晶体进行酶解改造，形成带末端氨基的原毒素；将阿维菌素的羟基进行激活、衍生化，形成带羧基的阿维菌素衍生物（Abamectin-COONa）；再利用氨基-羧基偶联剂进行两种生物毒素的生物耦合。

Effects of different anti-ions on dispersivity indicated that the best dispersivity was gained when diethanolamine was used.

使用氢氧化钠对聚丙烯酸不同程度的中和，通过红外光谱分析了羧基的中和程度，考察了羧基中和程度对分散剂性能的影响。

In complexes 8～16 synthesized by hydrothermal method, most of the ligands adopt multidentate coordination modes joining several lanthanide ions into high-dimensional coordination polymers. And changing of 5-substituting group on isophthalic acid has a little effect on the coordinated abilities of the meta-carboxyl groups.

水热法制备的配合物8～16中，配体多采取多齿配位模式桥连多个稀土离子，形成高维配位聚合物，同时由于羧基氧原子和稀土离子的强的键合力，间苯二甲酸的5位取代基的变化对间位羧基的配位能力的影响不大。

Several methods applied widely for synthesizing uronic acid are introduced, such as methods of one-step process and two-step process.

分别就糖醛酸的几种常用合成方法进行了介绍，即直接将羟甲基氧化成羧基的一步法和先将羟甲基氧化成甲酰基、再氧化成羧基的两步法。

The particular preparation procedure is as follows: preparing a carbon nanotube with carboxyl by acidulating the carbon nanotube; Preparing the carboxylic carbon nanotube/nylon 66 composite material by polymerizing the carboxylic carbon nanotube and the raw material (such as polybasic acid and polybasic amine) which is used for preparing the nylon 66 through in situ polymerization.

具体步骤为：通过对碳纳米管进行酸化，制备携带羧基的碳纳米管。通过原位聚合法将羧基化碳纳米管与制备尼龙66的原料进行聚合，制备羧基化碳纳米管/尼龙66复合材料。

The main factors that can affect the strength of base PAN fiber and how its hydrolysis reaction happened in alkaline conditions were discussed.

应用红外光谱仪、元素分析仪、比表面分析仪等对基体聚丙烯腈纤维及其部分水解PAN-COOH型离子交换纤维进行了表征，讨论了影响基体PAN纤维强度的主要因素和碱性条件下的水解反应获得了干态水解PAN纤维的性能指标：强度8.3 cN/dtex，交换容量0.26 mmol/g ， BET比表面积为0.58平方公尺/g的PAN-COOH型离子交换纤维，并较为详细地讨论了该纤维氰基转化成羧基的比率，羧基在纤维表面的排列及最大水解量。

Multilayer latex particles with carboxylic polymer as core, polymer with low glass transition temperature and film-formable under room temperature as shell, and lightly crosslinked polymer as intermediate layer were prepared with unsaturated carboxylic monomers by multistage seed emulsion polymerization. Finally, the room-temperature-film-formable polymer particles with hollow structure were obtained via the alkali treatment to the multilayer latex particles.

采用羧基单体进行多阶段的种于乳液聚合，制备了内核为带羧基的聚合物、最外层为易成膜的低玻璃化温度聚合物、中间为轻度交联中间隔离层的多层核壳结构乳胶粒，最后通过碱处理制成了具有室温成膜性的中空结构聚合物微粒。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。