Analysis of the characteristic sequence of intein and revision of its motifs

Since the first intein (Sce VMA) was found inSaccharomydes cerevisiae ATPases gene in 1990, more and more inteins were identified. It is necessary to analyze the new inteins to understand the sequence charateristics of inteins. By searching protein and nucleic acid database systematically, 101 inteins were found, of which 69 inteins contain homing endonuclease motifs. We only analyze the 69 inteins since most inteins are the classic inteins with homing endonuclease motifs. We found that the distribution of these inteins is particular among species and protein. By multiple sequence alignment, some new sequence characteristics were found and the motifs described previously were revised.     

浅谈公路桥梁钻孔灌注桩施工监理要点

本文主要从钻孔灌注桩施工准备阶段、施工阶段和成桩质量检查验收这三方面进行阐述.     

镱（Ⅲ）与2—（5—溴—2—吡啶偶氮）—5—二乙氨基酚显色反应的分光光度法研究

研究了在表面活性剂CTMAB存在下镱（Ⅲ）与5－Br－PADAP的显色反应．结果表明，在pH=9．66的NH4Cl－NH3·H2O缓冲溶液中，镱（Ⅲ）与5－Br－PADAP进行最佳络合．最大吸收波长λmax=580nm．表观摩尔系数为1．5×105L·mol-1·cm－1，镱（Ⅲ）星在0－12μg／25ml范围内符号比尔定律．     

师专普通物理实验教学中不确定度的讨论

论述了不确定度在普通物理实验教学中的可行性及计算。     

纯滞后系统的Smith-Fuzzy预估控制

介绍了Ｓｍｉｔｈ预估器存在的问题，采用模糊控制与Ｓｍｉｔｈ预估器相结合的控制策略．仿真结果表明，Ｓｍｉｔｈ－Ｆｕｚｙ预估控制器具有较好的控制效果和鲁棒性     

高温超导体Dy_(1-x)Pr_xB_(a2)Cu_3O_(7-δ)的磁弛豫研究

本文通过磁驰豫实验研究发现，Pr的掺杂对提高高温超导体的磁通钉扎能力有明显的作用．     

求一阶微分方程积分因子的两种方法

介绍了两种求积分因子的方法——公式法和待定指数法，使得求积分因子时有一定的规律可循     

Synthesis of 2,4-dibromo-5-fluorobenzonitrile

2,4-Dibromo-5-fluorobenzonitrile has been synthesized for the first time (81.5% yield). It may be used in synthesizing 2,4-dibromo-5-fluorobenzoic acid, the intermediates of fluoroquinolones. The ammoxidation procedure for preparation of the nitrile has been described in detail. Zheng Qiong: born in 1945, Associate professor     

理想稠密分布的诣零环

本文主要证明了特征为零的诣零DI-环是幂零的,其幂零指数≤5。