二聚作用

They had suppressed the cathodic process of carbon steel electrode. Their inhibition performance was also related with their molecule stereo conformation and electron configuration. Four of bis-(1, 1'-benzotriazoly)-α,β-diamide compounds linked via-CO 〓CO-chain were synthesized and certified by IR and 〓H-NMR. The minimum energy conformations of these compounds were obtained by MM2 forcefield program. The two benzotriazole moiety in BBT1 was more planar than in other compounds. This was beneficial in increasing the inhibition effects of BBT1. In 0.5M H〓SO〓 solution, BBT1 suppressed anodic corrosion reaction. In 3%NaCl solution, BBT1 suppressed both cathodic and anodic corrosion reactions. 1- [ (1'-imidazolly)-methyl] benzotriazole was synthesized by Mannich reaction.

合成了四个通过-CO〓CO-连接的双（1，1'-苯并三唑）-α，ω-二酰胺化合物，采用MM2分子力学程序优化了它们的分子结构，双（1，1'-苯并三唑）-α，ω-二酰胺化合物的缓蚀作用与其分子内两个苯并三唑单元的空间取向有关系，良好的平面性有利于苯并三唑二聚体的吸附和缓蚀作用，苯并三唑二聚体BBT1分子内两个苯并三唑单元近似平行，所以显示出较好的缓蚀效果。0.5M硫酸中BBT1主要抑制铜的阳极溶解的电化学反应；3％NaCl溶液中，BBT1对铜的阳极溶解和氧的阴极还原过程均有抑制作用，相比较而言对阴极过程的抑制作用更大一些。

In complex 1,Cucan be described as a four-coordinated square planar geometry.Compound 8 is the sodium salt of plumbagin and exists as ionic compound.Compounds 9-16 are the rare earth complexes of plumbagin with La,Y,Dy,Sm,Gd,Nd,Erand Eu.Compound 17 is binuclear Y complex.18 is mononuclear Ycomplex with plumbagin and another ligand from Plumbago Zeylanica.Compounds 19-21 are the ternary complexes with plumbagin and 2,2\'-bpy and phen as assistant ligand.In 19, the geometry of Cucan be described as five-coordinated distorted square pyramid that exists in a dimer through the weak bonding,and 1-D chain structure is formed by intermolecular hydrogen bonds.

化合物1的单晶结构分析表明1具有四配位平面四边形结构，化合物8是白花丹素的Na盐，以离子化合物形式存在；化合物9～16为白花丹素的La，Y，Dy，Sm，Gd，Nd，Er，Eu的稀土金属配合物；化合物17是白花丹素的双核钇结构；化合物18为白花丹素的单核钇结构，该配合物除了含白花丹素外，还有来自白花丹植物中的另一个单体化合物也参与配位；化合物19～21是以2，2\'-联吡啶和邻菲咯啉等含N配体为辅助配体，具有白花丹素—含N配体—金属离子的三元配合物，化合物19是白花丹素和2，2\'-联吡啶与Cu的配合物，具有五配位的四方锥构型，通过Cu…O弱的成键作用形成二聚体，再通过分子间的氢键作用进一步形成一维链状结构，化合物20和化合物21是白花丹素分别与2，2\'-联吡啶和邻菲咯啉的Zn配合物，都具有六配位八面体构型的双核锌配合物，呈一维链状结构，化合物20中链与链之间的大量氢键将一维链扩展成二维层，分子间的π-π堆积作用进一步形成三维结构。

Calcium pimelate, calcium azelate and zinc azelate are prepared by alkali neutralization process, and calcium dimer are prepared using double decomposition reaction, the effect of binary carboxylate heat stabilizer on PVC thermal stability is studied adopting Congo red method and toast with heat method.

通过碱中和法制备了庚二酸钙、壬二酸钙、壬二酸锌，采用复分解反应法制备了二聚酸钙，采用刚果红法与热烘法研究了二元羧酸盐热稳定剂对PVC的热稳定作用。

The tryptophan residues play important roles in DNA photoreactivation catalyzed by CPD photolyases. We have investigated the action mechanism concerning Trp in DNA photoreactivation, and obtained the results as follows: 1 We proposed a mechanism of photosensitized splitting of CPDs by Trp and Trp-containing peptides. 2 Quantum yields of splitting of the model compounds that a Trp linked covalently a CPD were obtained under 290 nm light in various solvents, these values changing with solvent, range from 0.01 to 0.5. 3 Utilizing pulse radiolysis technique, splitting processes were observed in aqueous solution of the CPDs with hydrated electron and some oxidative species (such as hydroxyl radical, bromic radical and azide radical), and obtained their rate constants. In the case of interaction between CPD and hydrated electron, splitting of the CPD anion, and pyrimidine anion transfer an electron to FAD or Rf, were observed. The process rate was slower one order more than that in photolyase. Minor, but highly mutagenic UV-light-induced lesions are (6-4) photoproducts, which are repaired by (6-4) photolyases. These enzymes, discovered in 1993, are not well characterized and their mechanism is still under investigation.

我们研究它的作用机理，获得以下结果：1）建立了色氨酸及其肽对嘧啶二聚体光敏化裂解的直接修复作用机理模型；2）获得了色氨酸共价键连接于嘧啶二聚体的化合物在多种溶剂中290nm光辐照裂解的量子效率，其值随溶剂而变化，范围在0.01-0.5；3）运用脉冲辐解观察到嘧啶二聚体与水合电子和一些氧化性的自由基作用裂解过程，得到相应速率常数；对二聚体与水合电子作用发生裂解以及向FAD返还电子的过程进行了体外模拟；4）（6-4）光解酶的作用机理中一个关键假定是氧杂环丁烷中间体在接受电子后能自发裂解，恢复二嘧啶的结构。

Erve growth factor combined with its receptor, activated Ras - MAP kinase , mitogen - activated protein kinase kinase is the important regulating factor that make IkB kinase, IKK, phosphated, IkB kinase make the IκBα:(the subunit of NF -κB ) phosphated, the phosphated IkBα degraded, and p65 - p50 heterodimer can be formed, then the heterodimer translocated to nucleus and combined with the promoter domain or other consensus sequence.

GF与其受体相结合，最后可以激活Ras-有丝分裂激活的蛋白激酶途径，有丝分裂激活的蛋白酶激酶(MEKK1)是IγB激酶发生磷酸化的重要调节因子，IKK使NF-κB的亚单位IKBα发生磷酸化，磷酸化的IKBα发生降解，而最后留下p65-p50二聚体，该二聚体然后转位到细胞核内与κB基因的增强子区域或与他的顺式作用序列结合。

The result expressed that under the concentration of 0.2mg/mL, the 6 compounds are all active to Sarcina lutea, ME-1, MT-6, MT-land MT-7 are active to Bacillus megaterium, to Escherichia coli, only MT-2 is active. The dimeric natural products are intensively existed in botany, most of them have the obvious biological activities. They have been concentrated on in recent years, and they are one of the compounds to which are enjoyed great popularity in natural product.

结果表明，在浓度为0.2mg/mL的条件下，六种化合物对藤黄八叠球菌均具有明显抑制作用，ME-1、MT-6、MT-1、MT-7对巨大芽孢杆菌有抑制作用，MT-2对大肠杆菌有抑制作用，对绿脓杆菌和枯草芽孢杆菌六种成分均无抑制作用；二聚体化合物在植物界广泛存在，多数二聚体天然产物具有显著的生物活性，引起人们的重视，是天然产物化学界研究的热门化合物之一。

The scavenging effect of polyphenols extracted from grape seeds such as monomers, dimers and trimers on superoxide and hydroxyl radicals is studied with the ESR spin trapping method. The results are comparable with those obtained from chemiluminescence method. It has been proved that polyphenols extracted from grape seeds have a strong scavenging effect on Oxygen free radicals. Probably this is the reason why drinking some grape wine every day is good for one's health.

用ESR自旋捕集技术研究了从葡萄籽分离的单体、二聚体和三聚体等多酚类物质对羟基自由基和超氧阴离子的精除作用，并与化学发光法的测定结果进行了比较，得到了较一致的结果，证明葡萄籽中多酚类物质对氧自由基的确有较好的清除作用，这很可能是喝少量葡萄酒有利于身体健康的原因。

Calcium dimer acids and zinc dimer acids were prepared by double decomposition reaction,and their structures were identified by IR.Their effects on heat stability of PVC were tested by way of Congo Red Method and Heating Method.Calcium dimmer acids and zinc dimmer acids were compared with traditional calcium stearate and zinc stearate.

通过复分解法制备了二聚酸钙和二聚酸锌，并通过红外检测证明了其结构；采用刚果红法、热烘法研究了二聚酸钙和二聚酸锌对PVC的热稳定作用，并与传统的硬脂酸钙、硬脂酸锌热稳定剂作了比较。

With an increase in Bcl-2 protein, more Bax homodimers were separated and conjugated with Bcl-2 protein to form more stable Bcl-2/Bax heterodimers than Bax homodimers, which'neutralize'apoptosis induction of Bax protein.

随着Bcl-2蛋白增多，越来越多的Bax蛋白同源二聚体被分开，与Bcl-2蛋白结合形成比Bax-Bax蛋白更稳定的Bcl-2-Bax蛋白杂二聚体，从而&中和&Bax蛋白的诱导细胞调亡作用。

The catalyst for IB dimerization, reactive site, reactive mechanism and dynamics research date was reviewed in this paper and try to explain the mechanism of selectivity enhancing by adding Tertiary butyl alcohol during IB dimerization and provide reference for the study of dimerization afterwards.

本文对异丁烯二聚催化剂、反应活性位、机理及动力学研究成果进行了综述，试图解释在异丁烯二聚时，加入的叔丁醇对二聚反应选择性提高的作用机理，为今后二聚反应的研究提供参考。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新