In order to obtain the optimized structure rubber, a novel miktoarm star styrene-butadiene rubber （MS- SBR） was initiated by a multifunctional macromolecular initiator with polydiene arm and Sn-C bond. The propertie...In order to obtain the optimized structure rubber, a novel miktoarm star styrene-butadiene rubber （MS- SBR） was initiated by a multifunctional macromolecular initiator with polydiene arm and Sn-C bond. The properties of MS-SBR were investigated with respect to the morphology, mechanical properties, and dynamic viscoelasticity in comparison with those of the blends, natural rubber （NR）/star styrene-butadiene random rubber （S-SBR） blend rubber and cis-l,4-polybutadiene rubber （cis-BR）/S-SBR blend rubber. The samples were analyzed using transmission elec- tron microscopy （TEM）, dynamic mechanical thermal analyzer （DMTA）, and mechanical properties test. The analy- sis results show that MS-SBR possesses the desired combination of low rolling resistance and high antiskid resistance, and is promising for application in high performance tire tread.展开更多
Object： To observe the dynamic changes of dopamine （DA） in the striatum with the process of duplicating cerebral ischemia and reperfusion （CIR） model on rats. And observe the effect of electroacupuncture （EA） o...Object： To observe the dynamic changes of dopamine （DA） in the striatum with the process of duplicating cerebral ischemia and reperfusion （CIR） model on rats. And observe the effect of electroacupuncture （EA） on such changes. Methods： Using microdialysis sampling, high performance liquid chromatography （HPLC） detecting technology, dynamic sampling from experimental animals at multiple moments to observe the changes of dopamine in striatum with ischemia. And observe the effect of EA at Fengchi （GB 20） on such changes. Result： About the extracellular level of DA in normal group, sham-operation group and sham-operation ＋ EA group, no significant changes were observed during the measuring period. The extracellular level of DA peaked at 15-45 min after MCAO and 0-30 min （P〈0.05） after reperfusion. A rising trend was also observed following 120 min after reperfusion. After EA, the extracellular level of DA was significant lower than ischemia group following 90 min after reperfusion （P 〈0.05）. And there was no peak again. Conclusion： EA at Fenchi （GB 20） can regulate the disorder of DA. EA can improve the integrity neurological function. This may be one of the mechanisms of acupuncture treating the lesion of cerebral ischemia and reperfusion.展开更多
基金Supported by National Natural Science Foundation of China (No.50573005)
文摘In order to obtain the optimized structure rubber, a novel miktoarm star styrene-butadiene rubber （MS- SBR） was initiated by a multifunctional macromolecular initiator with polydiene arm and Sn-C bond. The properties of MS-SBR were investigated with respect to the morphology, mechanical properties, and dynamic viscoelasticity in comparison with those of the blends, natural rubber （NR）/star styrene-butadiene random rubber （S-SBR） blend rubber and cis-l,4-polybutadiene rubber （cis-BR）/S-SBR blend rubber. The samples were analyzed using transmission elec- tron microscopy （TEM）, dynamic mechanical thermal analyzer （DMTA）, and mechanical properties test. The analy- sis results show that MS-SBR possesses the desired combination of low rolling resistance and high antiskid resistance, and is promising for application in high performance tire tread.
基金the Science and Technology Commission of Shanghai Municipality(014319364)the Science Foundation of Shanghai Municipal Commission of Science and Technology(05DZ19745,06DZ19732,064319053,07DZ19722,07DZ19733)+1 种基金the National Basic Research Program of China(973 Program,2005CB523306)Shanghai Leading Academic Discipline Project(B112 and T0302)
文摘Object： To observe the dynamic changes of dopamine （DA） in the striatum with the process of duplicating cerebral ischemia and reperfusion （CIR） model on rats. And observe the effect of electroacupuncture （EA） on such changes. Methods： Using microdialysis sampling, high performance liquid chromatography （HPLC） detecting technology, dynamic sampling from experimental animals at multiple moments to observe the changes of dopamine in striatum with ischemia. And observe the effect of EA at Fengchi （GB 20） on such changes. Result： About the extracellular level of DA in normal group, sham-operation group and sham-operation ＋ EA group, no significant changes were observed during the measuring period. The extracellular level of DA peaked at 15-45 min after MCAO and 0-30 min （P〈0.05） after reperfusion. A rising trend was also observed following 120 min after reperfusion. After EA, the extracellular level of DA was significant lower than ischemia group following 90 min after reperfusion （P 〈0.05）. And there was no peak again. Conclusion： EA at Fenchi （GB 20） can regulate the disorder of DA. EA can improve the integrity neurological function. This may be one of the mechanisms of acupuncture treating the lesion of cerebral ischemia and reperfusion.
