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(RbBi)_(1/2)MoO_4陶瓷微波介电性能的远红外反射谱研究 被引量:1
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作者 王秋萍 刘汉臣 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2012年第9期2382-2384,共3页
采用固相反应法制备了(RbBi)1/2MoO4陶瓷样品。室温下测量了(RbBi)1/2MoO4的红外反射谱,观察到15个振动模式;利用Kramers-Kronig(K-K)关系对样品的红外反射谱进行数据处理,获得材料的光频介电常数ε∞=2.17,微波频段的外推值为20.56,略... 采用固相反应法制备了(RbBi)1/2MoO4陶瓷样品。室温下测量了(RbBi)1/2MoO4的红外反射谱,观察到15个振动模式;利用Kramers-Kronig(K-K)关系对样品的红外反射谱进行数据处理,获得材料的光频介电常数ε∞=2.17,微波频段的外推值为20.56,略小于实际测量值21.4;获得材料的本征品质因数Q×f为11 790GHz,高于实际测量值6 200GHz,说明陶瓷材料的品质因数还有较大提升空间。 展开更多
关键词 微波介电陶瓷 (rbbi)1/2MoO4 红外反射谱 介电常数 品质因数
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Expression and inhibitory activity analysis of a 25-kD Bowman-Birk protease inhibitor in rice 被引量:2
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作者 CHEN Jun MAO Shengji +6 位作者 XlE Yang CAO Zhongren ZHANG Yan LIU jing CHEN Zhangliang QU Lijia GU Hongya 《Chinese Science Bulletin》 SCIE EI CAS 2006年第1期54-62,共9页
Rice Bowman-Birk inhibitors (RBBI), with one (8 kD) or two homologous domains (16 kD), were found to be effective trypsin inhibitors in vitro. In this study, we demonstrate that the 25-kD protein corresponding to the ... Rice Bowman-Birk inhibitors (RBBI), with one (8 kD) or two homologous domains (16 kD), were found to be effective trypsin inhibitors in vitro. In this study, we demonstrate that the 25-kD protein corresponding to the three-domain RBBI indeed ex- ists in rice in planta, and that the RBBIs are regulated by development and wounding. We also found by inhibitory activity assay that the 3:13 disulfide bond, but not the 4:5 disulfide bond, suppresses the tryp- sin-inhibitory activity, and the D3 domain of RBBI3-1 has no inhibitory activity against trypsin, chymotryp- sin, paparin or subtilisin. Mutation analyses showed that conversion from Lys to Leu or Tyr in the N-terminal P1 site in D1 domain did not create chy- motrypsin-inhibitory activity, suggesting that the structure of the reactive loop in D1 domain hinder the new inhibitory specificity at P1 site, and the chy- motrypsin-inhibitory activity might need the participa- tion of other structures, e.g. 3:13 disulfide bond. 展开更多
关键词 水稻 rbbi 双硫键 胰凝乳蛋白酶 胰岛素
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