文章设计了一款可以兼容北斗、GPS的信号转发器。该信号转发器采用集总参数的匹配方式,选用英飞凌公司的BFP740ESD芯片,用ADS软件进行设计、仿真、优化,实现了在1.555~1.58 GHz的频带内,增益在40 d B以上,输入输出反射系数小于-17 d B...文章设计了一款可以兼容北斗、GPS的信号转发器。该信号转发器采用集总参数的匹配方式,选用英飞凌公司的BFP740ESD芯片,用ADS软件进行设计、仿真、优化,实现了在1.555~1.58 GHz的频带内,增益在40 d B以上,输入输出反射系数小于-17 d B的两级小信号高增益放大器的设计。展开更多
P68 RNA helicase is a prototypical DEAD box RNA helicase. The protein plays a very important role in early organ development and maturation. Consistent with the function of the protein in transcriptional regulation an...P68 RNA helicase is a prototypical DEAD box RNA helicase. The protein plays a very important role in early organ development and maturation. Consistent with the function of the protein in transcriptional regulation and pre-mRNA splicing, p68 was found to predominately localize in the cell nucleus. However, recent experiments demon- strate a transient cytoplasmic localization of the protein. We report here that p68 shuttles between the nucleus and the cytoplasm. The nucleocytoplasmic shuttling of p68 is mediated by two nuclear localization signal and two nuclear exporting signal sequence elements. Our experiments reveal that p68 shuttles via a classical RanGTPase-dependent pathway.展开更多
文摘P68 RNA helicase is a prototypical DEAD box RNA helicase. The protein plays a very important role in early organ development and maturation. Consistent with the function of the protein in transcriptional regulation and pre-mRNA splicing, p68 was found to predominately localize in the cell nucleus. However, recent experiments demon- strate a transient cytoplasmic localization of the protein. We report here that p68 shuttles between the nucleus and the cytoplasm. The nucleocytoplasmic shuttling of p68 is mediated by two nuclear localization signal and two nuclear exporting signal sequence elements. Our experiments reveal that p68 shuttles via a classical RanGTPase-dependent pathway.
