Substituent Effect on Proton Affinity of Imidazole in Cu,Zn-Superoxide Dismutase

To investigate whether the proton-accepting ability of imidazole in Cu,Zn-superoxide dismutase （SOD） was possibly modulated by Zn（Ⅱ） or not, the proton affinity （Ap） of N^3 in imidazole group was calculated by density functional theory （DFT） with B3LYP functional. It was found that Zn（Ⅱ） attenuates the Ap, because of its electron-withdrawing effect, while the three ligands connected with Zn（Ⅱ） （residues of two His and one Asp） exert an opposite effect, owing to their electron-donating ability. This finding suggested that the three ligands should play a role in the normal function of Cu,Zn-SOD and should be taken into consideration in the future study.     

A Class of High-affinity Bicyclooctane G551D-CFTR Activators Identified by High Throughput Screening

The glycine-to-aspartic acid missense mutation at the codon 551(G551D) of the cystic fibrosis transmem-brane conductance regulator (CFTR) is one of the five most frequent cystic fibrosis (CF) mutations associated with a severe CF phenotype. To explore the feasibility of pharmacological correction of disrupted activation of CFTR chloride channel caused by G551D mutation, we developed a halide-sensitive fluorescence miniassay for G551D-CFTR in Fisher rat thyroid(FRT) epithelial cells for the discovery of novel activators of G551DCFTR. A class of bicyclooctane small molecule compounds that efficiently stimulate G551D-CFTR chloride channel activity was identified by high throughput screening via the FRT cell-based assay. This class of compounds selectively activates G551D-CFTR with a high affinity, whereas little effect of the compounds on wildtype CFTR can be seen. The discovery of a class of bicyclooctane G551D-CFTR activators will permit the analysis of structure-activity relationship of the compounds to identify ideal leads for in vivo therapeutic studies.     

4-取代环芬尼类化合物的合成及标记

以Cyclofenil为原料, 合成得到一系列氟乙氧基衍生物. 通过受体结合实验, 筛选得到一个对雌激素受体(ER)具有高特异性和高相对亲和力(RBA)的化合物Penta-Cyclofenil-FEt. 通过实验的优化设计, 合成得到相应的氟标记前体, 产物通过IR, UV, ¹H NMR, ¹⁹F NMR或ESI-HRMS进行了表征. 在冷试条件下, 得到了冷氟取代参比化合物. 在热试验条件下, 得到F-18标记产物. 此类非甾体雌激素受体分子探针的合成, 为PET (positron emission tomography)显像雌激素受体β从而评估乳腺癌的恶化程度奠定了基础.     

结合QSAR、分子对接和动力学模拟剖析小分子与不同受体的结合亲和力

本文从三种不同的角度分析小分子与受体的结合情况,互相补充,为探讨不同类型结合模式提供有用的信息和研究手段。利用比较分子相似性指数法(CoMSIA)和分子全息定量构效关系法(HQSAR),建立一系列小分子与不同受体(AhR和TTR)亲和力活性数据的定量构效关系预测模型。结果表明模型均具有较高稳定性和预测能力(q~20.55,r~20.85)。同时,根据CoMSIA模型的等值线图和HQSAR模型的原子贡献图得出BDE154和BDE019与受体之间的结合作用方式,主要为疏水作用,带羟基基团化合物不利于与受体结合。此外,分子对接结果表明模型的结合力类型分别为疏水作用和π-π堆积作用。而分子动力学模拟的结果表明,随着小分子的加入,受体的二级结构发生转变。     

数学教育改革中几个问题的思考(续)

4数学教育改革的几个基本点 针对上述问题，本人认为，数学教育改革中，我们应当在“亲和力”“问题性”“思想性”“联系性”等方面进行大胆创新．     

共价键理论发展史及其教育价值

共价键理论是化学学科的核心内容,基于认识视角梳理共价键的发展史,将共价键理论的形成和发展分为4个阶段,现象阶段：初识物质结合方式;表征阶段：探索微粒结合过程;本质阶段：揭示共价键形成实质;发展阶段：解释物质结构与性质。共价键历史的发展阶段与教材的编排一脉相承,结合学生的认知发展,有以下教育价值：(1)凸显学科思想方法;(2)持续发展学生认识进阶;(3)促进学生素养形成。     

磁流体发电

 目前,我国主要采用的是火力发电.所有的火力发电,不管是用煤、石油等燃料,还是采用地热、核能发电,都采用间接发电方式,即先由热能加热锅炉,再由锅炉蒸汽推动汽轮机,再经汽轮机驱动发电机,最后得到所需的电能.     

Molecular Dynamics Simulation of the Binding Interaction between Hormone Glucagon Protein and Self-Assembled Monolayer Molecules

Restrained molecular dynamics simulations were performed to study the binding affinity of the peptide with alkanethiols of different tail-groups, S（CH2）7CH3, S（CH2）7OH and S（CH2）7COOH, which self-assembled on Au（111） surface in the presence of water molecules. The curves of binding affinity were calculated by fixing the center of mass of the peptide at various distances from the assembling surface. Simulation results show that the binding affin- ity is in the order as COOH-SAMs〉OH-SAMs〉CH3-SAMs, while 100% COOH-SAMs〉5% COOH-SAMS in concentration. The effects on binding affinity by different tail-groups were also studied. Results show that the binding affinity between COOH-SAMs and the peptide is bigger than those of the others and increasing the acidity of COOH-SAMs will result in stronger attractive power.     

求解车辆路径问题的免疫算法

将免疫算法用于求解车辆路径问题,并根据车辆路径问题的具体情况提出了一种基于分组匹配的亲和力计算方法.实验结果表明,免疫算法能有效地应用于车辆路径问题.