首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1篇
  完全免费   1篇
  物理学   2篇
  2017年   1篇
  2015年   1篇
排序方式: 共有2条查询结果,搜索用时 31 毫秒
1
1.
蛋白质与配体作用的瞬时性对调节生物功能的正常发挥至关重要。采用紫外‐可见吸收光谱法(UV‐Vis)和圆二色光谱法(CD)研究了高铁肌红蛋白(metMyoglobin ,metMb)与一氧化氮的配位反应过程,论证了metM b与NO配位反应机理以及影响配位反应的因素。结果表明:metM b能与NO发生配位反应,420,534和568 nm处特征峰的出现,表明metM b与NO结合并生成一种新的配合物———亚硝基高铁肌红蛋白(nitrosylmetmyoglobin ,metM bNO )。随着时间的推移,溶液中NO浓度逐渐减小,metM bNO配合物中Fe—N配位键在大量H2 O分子的进攻下断裂,NO慢慢地脱离,metM bNO配合物完成解离过程并重新生成metM b。实验中还发现metM b与NO配位反应的进行受到缓冲介质类型、离子强度、pH及温度等外界因素的影响。并且在0.01 mol?L -1磷酸盐缓冲液近中性条件时,metM b与NO配位反应最先达到平衡;当温度较低为280 K时,更易于metM b与NO配位反应的进行。此外,CD数据表明NO只与metM b血红素中心的铁原子发生配位反应而对蛋白二级结构影响甚微。探讨metM b与NO配位反应机制对于进一步研究生物体内NO功能的发挥有着重要的指导意义。  相似文献
2.
High volumetric power density (VPD) is the basis for the commercial success of micro-tubular solid oxide fuel cells (mtSOFCs). To find maximal VPD (MVPD) for anode-supported mtSOFC (as-mtSOFC), the effects of geometric parameters on VPD are analyzed and the anode thickness, tan, and the cathode length, lca, are identified as the key design parameters. Thermo-fluid electrochemical models were built to examine the dependence of the electrical output on the cell parameters. The multiphysics model is validated by reproducing the experimental I-V curves with no adjustable parameters. The optimal lca and the corresponding MVPDs are then determined by the multiphysics model for 20 combinations of rin, the inner tube radius, and tan. And all these optimization are made at 1073.15 K. The results show that:(i) significant performance improvement may be achieved by geometry optimization, (ii) the seemingly high MVPD of 11 and 14 W/cm3 can be easily realized for as-mtSOFC with single-and double-terminal anode current collection, respectively. Moreover, the variation of the area specific power density with lca2(2 mm, 40 mm) is determined for three representative (rin, tan) combinations. Besides, it is demonstrated that the current output of mtSOFC with proper geometric parameters is comparable to that of planar SOFC.  相似文献
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号