哺乳动物细胞光电行为的机理研究

研究了阿霉素、寡霉素和秋水仙素对细胞光电流的影响,发现细胞光电流的变化可适时表征药物对细胞的作用,且药物对细胞光电流的抑制率具有剂量和时间依赖性.据此提出了“光激励酶促反应加速模型”,并对哺乳动物细胞光电行为的机理进行了探讨.     

硅锆复合包覆BiVO4晶体的表征及其机理研究

利用正硅酸乙酯(TEOS)和氧氯化锆(ZrOCl2·8H2O)的水解反应并经高温煅烧后,在BiVO4晶体表面形成SiO2·ZrSiO4膜,以提高BiVO4的耐高温性.采用红外光谱仪、X射线衍射仪、差热分析仪对产品进行了表征,并得出结论:包覆SiO2·ZrSiO4膜后的BiVO4晶体,其耐热温度由680℃提高到1000℃,并对包覆机理进行了探讨.     

Magnetic and electrical properties of new magnetic phase in Si1−xMnx crystals

We have investigated the magnetic and electrical transport properties of Si_1−xMn_x single crystals grown by the vertical Bridgman method. The alloys with Mn concentrations up to x=0.64 have weak ferromagnetic ordering around T_C∼30 K. However, Si_0.25Mn_0.75 alloys show weak ferromagnetic ordering at 70 K and antiferromagnetic ordering at 104 K, which is confirmed by magnetization and electrical transport studies.     

明胶基多孔碳球电极材料的制备及电化学性能研究

Gelatin-based porous carbon beads have been fabricated from gelatin micro-spheres by means of solidification, carbonization and chemical activation with KOH. The physical properties of gelatin-based porous carbon beads were studied by a t-plot method based on N₂ adsorption isotherms. The gelatin-based porous carbon beads activated at 800 ℃ exhibited the largest specific surface area and resulted in the highest capacitance. Carbon/carbon super-capacitors cells assembled with the electrode materials in 1.0 mol·L^-1 NEt₄BF₄ / acetonitrile electrolyte have also been studied. The electrochemical properties of gelatin-based porous carbon beads electrode were studied by using constant-current discharge tests. The results indicate that the gelatin-based porous carbon beads electrode is with good cycling stability and specific capacitance of 119.8 F·g^-1.     

New synthetic route for preparing rattle-type silica particles with metal cores

Rattle-type silica particles with metal cores, applicable to catalysts and metal/inorganic composite coating materials, were prepared by the pre-shell/post-core method that can control the size of metal cores inside silica capsules and exchange from metal cores into different ones with a metal displacement reaction.     

Paradoxical effects of elastase inhibitor guamerin on the tissue repair of two different wound models: sealed cutaneous and exposed tongue wounds

Innate elastase inhibitors are known to be putatively involved in the regulation of tissue inflammation by inhibiting polymorphonuclear leukocyte (PMN) derived proteinases. The aim of this study was to evaluate affects of leukocyte elastase suppression and PMN infiltration on wound healing in mouse by administering the recombinant elastase inhibitor guamerin (rEIG) in two different wound models; 1) impaired pin-punctured dorsal mucosa of anterior tongue wound, 60 mice, treated with saline containing rEIG that were fed ad libitum and 2) stable linear excisional cutaneous wound, 40 mice, covered with fibrin sealant containing rEIG. The progress of healing was analyzed by histological methods. The tongue wounds treated with rEIG became edematous around the pin-punctured tongue wound, and influx of inflammatory cells and PMN into the underlying stromal tissue were seen rapidly after wounding and peaked between 2-4 days. Whereas the control mice showed almost no wheal formation in the pin-punctured wound, a far lesser levels of PMN infiltration, and almost complete wound closure in 4 days. In the other model, the liner excisional cutaneous wound treated with fibrin sealant containing rEIG showed early wound constriction, lesser degree of inflammatory cells influx, and complete reepithelialization in 4-5 days, whereas the wound of control mice with the fibrin sealant alone showed contrary delayed reepithelialization, greater degree of inflammatory cell infiltration, and consequencial formation of greater granulation tissue at wound site. Taken together, these data suggest paradoxical effects of rEIG on the wound healing where in the wound exposed to infiltrating milieu of microorganisms in the oral cavity, the rEIG aggravates the wound healing by interfering with other innate defensive factors and extended greater flux of PMNs to inflamed wound site, while in the wound enclosed by fibrin, the rEIG accelerated wound healing by inhibiting the inflammation-generated proteases and the acute inflammatory reaction.     

Self-assembly and binding properties of a metallomacrocycle having two interactive binding subcavities

A metallomacrocycle containing two topologically discrete binding subcavities is self-assembled and shows a positive homotropic cooperative binding behavior.     

新型正极材料三硫代环磷氮烯无机聚合物的合成

采用缩合聚合方法合成了新型三硫代环磷氮烯无机聚合物[(NPS₃)₃]_n，利用红外光谱测试与元素含量分析技术证明了[(NPS₃)₃]_n的分子结构与组成，并对聚合物材料的粒度、比表面积及微观形貌进行了考察。TG/DTA 实验证明材料在200 ℃ 以下具有良好的热稳定性。循环伏安测试表明[(NPS₃)₃]_n正极材料在锂电池体系具有2.15 V的电化学还原电位和2.45 V的电化学氧化电位，经充放电循环实验观察，材料的首次放电容量达到749.0 mAh·g^-1，与理论容量(759.0 mAh·g^-1)十分接近；经过50次充放电循环后，放电容量保持在674.8 mAh·g^-1，具有很高的使用容量和优秀的循环性能。