Dynamic Response and Fracture Mechanism of a Novel Structural Radar Absorbing Material

A novel structural radar absorbing material （SRAM）, which gives the normal resin-base composites new function, is prepared. The dynamic compressive tests of SRAM are carried out in both in-plane and normal directions of composites by means of the split Hopkinson pressure bar （SHPB）. In the compressive test along in-plane direction, failure occurs at the interface between a fibre and the matrix. A fracture mode and mechanism was proposed to explain these results. The addition of absorbing particles results in the deterioration of the compressive properties. However, there is no obvious decrease on compressive strength of SRAM with the radar absorbing properties.     

Synthesis, biological evaluation, and modeling of dimeric PPI analogues as novel DNA minor groove binders

A series of symmetrical dimeric proton pump inhibitor (PPI) analogues, designed as novel type DNA minor groove binders, was synthesized and evaluated for anti-tumor activity. Some of these new compounds showed IC(50) values below 10 microM in an in vitro anti-tumor test. A molecular modeling study was performed to confirm the sequence selectivity of these compounds towards AT base pairs in DNA. Two effective compounds were selected and docked into the minor groove of DNA. The snug binding may be responsible for their cytotoxic and anti-tumor effects.     

配合物[Co(qina)2(H2O)2]•2DMSO的晶体结构及其与DNA作用研究

合成了配合物[Co(qina)₂(H₂O)₂]•2DMSO单晶(qina为喹哪啶酸). 配合物属于单斜晶系, P2(1)/n空间群, 其分子结构为规则的八面体构型, qina以氮原子和羧酸根氧原子与Co^2＋离子配位, 两个水分子为轴向配位. 配合物之间富有配位水分子分别与DMSO的氧原子、qina中未与Co(II)配位的氧之间氢键作用. 配合物与鱼精DNA作用的紫外光谱和荧光光谱表明, 两者之间有一定的相互作用, 并可能以局部插入方式为主.     

甲酸铵催化转移氢化还原肽链中的芳香硝基——对氨基苯丙氨酸的间接引入

研究了用甲酸铵催化转移氢化法(AF-CTH)对不同类型肽中的芳香硝基的还原行为, 这些肽类化合物包括促黑激素(MSH: 四肽)、促黄体素释放激素(LHRH: 十肽)和强腓肽(十七肽)的类似物. 用HPLC对还原过程进行了跟踪监测, 结果显示, 除含对氯苯丙氨酸残基的LHRH类似物因发生脱氯副反应不适合用AF-CTH还原外, 其余序列还原过程中均无明显副反应发生, 硝基几乎定量地转化成为相应的氨基, 实现了对氨基苯丙氨酸向肽链的间接引入. 另外发现, 硝基还原所需的时间与肽链长度有关, 肽链越长, 还原所需时间越长, 但与其在序列中的位置关系不明显.