二聚体

The copolycondesation type polyamic acid was synthesized by using pyromellitic dianhydride and 3,3',4,4'-benzophenonetetracarboxylic dianhydride as the dianhydride monomers, 4,4'-diamino diphenylmethane and 4,4'-oxydianiline as the diamine monomers under microwave irradiation in dimethylformamide.

在N，N'-二甲基甲酰胺溶剂中，以均苯四甲酸酐和3，3'，4，4'-二苯酮羧酸二酐为二酐单体，4，4'-二氨基二苯醚和4，4'-二氨基二苯甲烷为二胺单体，采用微波辐射低温溶液共缩聚，合成了聚酰胺酸预聚体，然后亚胺化脱水、环化，生成共缩聚聚酰亚胺。

Purified GO had a molecular weight between 145, 000 and 162, 300, as determined by Sephadex G-200 filtration and SDS-PAGE of the enzyme as cross-linked with glutaraldehyde. This result showed that the holoenzyme was a tetramer, and no change occurred in molecular weight of the enzyme during the s〓orage. The active form of GO from brassica leaves showed a constant molecular weight during purification, so did that from O. sativa leaves during greening of etiolated seedlings, maybe acting as a stable tetramer.

用Sephadex G-200胶过滤和戊二醛交联后的SDS-PAGE法测得纯化的菜心叶片GO的分子量在145，000-162，300间，为四聚体；并且在放置过程中其分子量和聚合态均保持不变，为稳定的四聚体；进一步研究表明菜心叶片GO在纯化过程中和水稻叶片GO在黄化苗的转绿过程中，两种GO活性状态的分子量和聚合态也没有发生变化，均呈四聚体。

A series of modified polyurethane elastomer materials with different amino siloxane content were synthesized,which were based on polyoxypropylene glycol,aminoethyl aminopropyl poly,toluene diisocyanate and the curing agent dimethylsulfide toluylenediamine.

以聚氧化丙烯二醇或聚氧化丙烯三醇、氨乙基氨丙基聚二甲基硅氧烷、甲苯二异氰酸酯为原料在无溶剂条件下制备预聚体，利用二甲基硫甲苯二胺为固化剂合成一系列氨基硅油改性聚氨酯弹性体材料，并对材料的力学性能、耐热性、表面水接触角等性能进行了测试。

However, fully consideration of special structure and physiological function of CRP is critical to investigate whether CRP provide protect effect or pathogenic effect in the progression of atherosclerosis. CRP is a member of pentrxins family, which consists of five identical, noncovalently associated 23-kDa protomers arranged symmetrically around a central pore with a 102 A external diameter. Each protomer has a recognition face with a phosphocholine binding site consisting of two coordinated calcium ions adjacent to a hydrophobic pocket. The opposite face of the pentamer is the effector face, where complement Clq binds and Fc receptors are presumed to bind. A cleft extends from the center of the protomer to the central pore of the pentamer. Both faces ofpentamer form a special bi-phase structure: one face is the ligand recognition phase, which can recognize apoptosis cells and enzyme modified low density lipoprotein in which PCh is exposed.

CRP是一种五聚体蛋白，外径为102 A，由5个相同的单体以非共价键结合，形成双面的环形结构，每个单体的配体识别位点或受体结合位点分别位于五聚体两个平面上，分别组成配体识别相和效应器相，从而构成特殊的二相性结构：一面为配体识别相，含有磷酸胆碱(phosphorycholine，PCh)结合位点，能够使CRP识别在病理条件下暴露出PCh的凋亡细胞、酶修饰低密度脂蛋白(enzyme modified low density lipoprotein，E-LDL)等。E-LDL是天然低密度脂蛋白(native Low density lipoprotein，N-LDL)在多种蛋白酶，如胰蛋白酶、神经氨酸酶、胆固醇酯酶等作用下的代谢产物，其主要特点是结构发生改变(N-LDL大小均匀，平均直径250±30 A，E-LDL大小差异极大，直径为100-2000 A)，暴露磷酸胆碱位点，能够被CRP识别；另一面为效应器相，能够与巨噬细胞、单核细胞表面受体FcγRⅡa结合，介导巨噬细胞、单核细胞识别及吞噬凋亡、坏死细胞作用。

Polyols can be divided into latex polyol and dispersion polyolaccording to the way of preparation. In this paper, acrylic latex polyol and acrylic dispersionpolyol were synthesized respectively. One kind waterborne polyisocyanate, which was waterbornehexamethylenediisocyanate trimer, was obtained by hydrophilic modification. Andisophorone diisocyanate trimer (T1890E), which can formulate into 2K-WPU coatings withpolyols, was selected from the unmodified polyisocyanates.

本文合成了两种羟基组分：丙烯酸乳胶多元醇和丙烯酸分散体多元醇，亲水改性得到了一种水性多异氰酸酯组分：水性六亚甲基二异氰酸酯三聚体，同时在未改性的多异氰酸酯组分中遴选了一种多异氰酸酯：异佛尔酮二异氰酸酯三聚体(T1890E)，可用来组成双组分水性聚氨酯涂料。

Therefore, the EL spectra of (Znq_2)_4 is wider than that of Znq_2. 4._2 was synthesized. The analysis of molecular spatial structure and the characterization of material performance of_2 and Liq showed that two Liq molecules and two Naq molecules were connected by Na-O-Na bond bridges to form_2. Compared with Liq,_2 exhibits stronger rigidity in planar molecular structure, larger steric hindrance and intermolecular distance, and much smaller molecular polarity, thus resulting in much longer fluorescence lifetime, much higher fluorescence quantum efficiency, wider energy bandgap and better film formability. When used as light-emitting layer in OLED,_2 shows lower formation probability of excited dimmer and exciplex formation than Liq, thus emits bluer light with higher current efficiency than Liq. When_2 ultrathin film is used as electron injection layer in OLED, it exhibits higher current density, higher luminance, lower turn-on voltage and higher current efficiency than Liq ultrathin film for the existence of sodium ions in_2 ultrathin film. 5. The summarization the relationship between molecular spatial structure and material performance of Alq_3,(Znq_2) and Liq, lead the conclusion that the molecular spatial structure of Mq_n affects its material performance in such aspects as the rigidity of planar molecular structure, intermolecular interaction, molecule stacking mode and intermolecular distance.

制备了_2，通过对_2和Liq的分子空间结构与性能进行分析与讨论，发现_2是通过两个Na-O-Na键桥将两个Liq和两个Naq连接构成的，其分子平面结构的刚性程度强于Liq，空间位阻大于Liq，分子之间的距离大于Liq，分子极性远远小于Liq；_2的荧光寿命长于Liq，荧光量子效率高于Liq，成膜性优于Liq；_2的禁带宽度比Liq大，光致发光光谱中_2的最大发射峰较Liq发生蓝移；当_2在OLED中作为发光层时，激发二聚体与激基复合物的生成几率远远小于Liq，发的光比Liq更蓝，电流效率大于Liq；_2超薄膜中有Na离子的存在，与Liq超薄膜相比，当其在OLED中作为电子注入层时，具有更大的电流密度，更高的发光强度，更低的阈值电压和更高的电流效率 5、对上述Alq_3、Znq_2和Liq的分子空间结构与材料性能之间的关系进行了归纳总结，认为Mq_n的分子空间结构主要在分子平面结构的刚性程度，相邻分子之间的相互作用，分子堆叠的方式和分子之间的距离这四个方面影响其性能。

According to structure analysis, the contents of α-helix and dimer structure in refolded eMDH were increased by the cooperation, and eMDH activity was enhanced.

对复性产物结构的初步分析发现，耦合作用可使eMDH分子的α-螺旋及二聚体含量明显增多，因此复性产物的活性也显著提高。

The more dangerous of patients were, the more abnormal of haemostatic disturbances were.

依那普利及特拉唑嗪在满意降压的同时可通过降低血浆TF、FⅦ：C促凝活性及D-二聚体的含量改善血栓前状态，但不影响血浆TFPI的活性。

Methods:In patients with ACS(n=32) and controls(n=21) the selective coronary arteriography was performed and the coronary artery stenosis scores were evaluated through accumulative total integration. Plasma concentrations of fibrinogenwere determined with hemagglutinin analysator and plasma concentrations of von Willebrand factor、 D-Dimer、 plasminogen activator inhibitor、platelet membrane glucoprotein(GMP-140) were determined with enzyme linked immunosorbent assay.

选择ACS患者32例和对照组21例进行选择性冠状动脉造影，对冠脉造影结果采用累计积分法进行冠状动脉狭窄评分；使用血凝分析仪测定受试者血浆纤维蛋白原水平，使用酶联免疫法测定外周静脉血血管性血友病因子、D-二聚体、纤溶酶原激活剂抑制物、血小板膜糖蛋白140（GMP-140）的含量。

Agents can also cross-link each hemoglobin molecule internally to prevent its breakdown into dimers.

一些双功能试剂也能使每个血红蛋白分子内部交联，以防止分解成二聚体。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。