牛血红蛋白分子印迹聚硅氧烷的吸附和释放性能

目的 制备对牛血红蛋白(HB)具有选择性吸附及缓释能力的生物材料.方法 以HB作为模版分子,以硅烷为功能单体,海藻酸钙水凝胶膜为载体合成HB分子印迹聚硅氧烷(MIP),同时不加模板HB制备非印迹聚硅氧烷(NIP),并研究其对HB的吸附和释放性能.结果 MIP对HB的重吸附能力明显强于NIP,并能选择性识别混合蛋白质中的模版蛋白质分子,同时在磷酸盐缓冲液(PBS)和Tris-HCl缓冲液中MIP对HB均具有很好的缓释能力.结论 通过分子印迹技术可制备对目标蛋白质具有选择性吸附及缓释能力的生物材料.     

Preparation and properties of gelatin hydrolysate modified with polysiloxane quaternary ammonium salts

PSiQAEp-GH polymers were synthesized by the reaction of gelatin hydrolysate (GH) and polysiloxane quaternary ammonium salts containing epoxy group (PSiQAEp) with different molecular weight from 3147 to 12996. The results of FTIR, ¹H NMR and ¹³C NMR showed that the reaction occurred between primary amino group of arginine in GH and epoxy of PSiQAEp. The XRD and DSC studies showed that the degree of short-range order of PSiQAEp-GH reduced and its glass transition temperature (Tg) lowered more than 10?°C compared with GH. The determinations of moisture absorption and contact angle (CA) indicated that the hydrophobility of PSiQAEp-GH was better than GH. The tests of inhibitory zone and minimum bactericidal concentration (MBC) illustrated that the PSiQAEp-GHs exhibited excellent antibacterial activity, and the antibacterial activity depended on both the chemical structure of PSiQAEp-GHs and the biological structure of the bacteria.     

硅橡胶印模材料在精密附着体修复中的护理探讨

精密附着体义齿是一种将固位体放置于固定义齿上的活动—固定联合修复体,其制作要求很高,工序较繁杂,对印模要求也高,不单要求基牙清晰完整,还要求活动义齿部分采用功能性印模、边缘的延伸充分足够。目前临床常用的印模材料有糊剂型或粉剂型藻酸盐弹性印模材料和硅橡胶印模材料     

硅橡胶印模材料在精密附着体修复中的护理探讨

目的探讨硅橡胶印模材料在精密附着义齿修复中的应用价值。方法使用Rapid硅橡胶印模材料为33例患者制取37副工作印模，使用藻酸盐印模材料制取29副非工作印模。结果37副工作印模均一次操作完成，符合临床要求，29副非工作印模中有4例通过二次印模才达到要求。结论Rapid硅橡胶印模材料在精密附着体修复中应用效果好，具有体积稳定性好、操作简便的特点。     

种子乳液聚合方法制备聚苯乙烯—聚硅氧烷核壳粒子

采用种子乳液聚合的方法，制备以聚苯乙烯为壳、聚有机硅氧烷为核的弹性粒子，探讨了加料和引发方式对粒子的结构及形貌的影响，并对苯乙烯种子乳液聚合的机理进行了初步的讨论。     

Definition of ionic transfer mechanisms based on positron annihilation studies in lithium batteries

An interface ionic transfer detection method called the Doppler broadening S parameter of positron annihilation spectroscopy (PAS) is used to study polysiloxane solid electrolytes with ethylene oxide (EO) side chains and carbonate liquid electrolytes. First, the solid polymer electrolytes are modified to enhance contact with an acrylate, and an increase in the lengths of the EO chains is shown to decrease the resistance of the transition interface layer on a pristine electrode surface. Second, a study of ionic transfer on the electrode surface after electrochemical reactions showed that the solid polymer electrolytes have a greater effect on the interface transition layers than the carbonate liquid electrolytes. In addition, the detection technique revealed a continuous-phase interface containing a chemical membrane formed from carbonate liquid electrolytes by electrochemical reactions; the ionic transfer enhancement due to this membrane is examined by this new detecting methodology.