Regularities in the E. coli promoters composition in connection with the DNA strands interaction and promoter activity

INTRODUCTION It is well known that the physical properties, namely DNA strands interaction in promoter are connected with their activity. As it was established the two promoter regions ?35 and ?10 are the most important for the promoter functioning, all bases in the ?35 (TTGACA) and ?10 (TATAAT) hexamers were highly conserved (Harley and Reynolds, 1987; Hawley and McClure, 1983). The functional impor- tance of these sequences was proved in many inves- tigations (Record et al., 199…     

2,4,6-三巯基-1,3,5-三嗪三钠盐对废水中铅和汞捕集效果研究

本文研究了2,4,6-三巯基-1,3,5-三嗪三钠盐（TMT-18F）对铅离子和汞离子的捕集效果,讨论了TMT-18F的用量、溶液pH值、反应时间三个因素对捕集效果的影响。实验表明,TMT-18F在pH=4的溶液中,室温静置40min后,铅和汞的去除率均达99.6%以上,且废水中铅离子和汞离子剩余浓度远远低于国家排放标准,说明TMT-18F对重金属离子的捕集效果很理想。     

新型重金属捕集剂对废水中银捕集效果研究

本文研究了重金属捕集剂-2,4,6-三巯基-1,3,5-三嗪三钠（TMT-18F）对银离子的捕集效果,讨论了TMT-18F的用量、溶液pH、反应时间这三个因素对捕集效果的影响。实验表明,TMT-18F在pH=4的溶液中,室温静置30min后,银的去除率达99％以上,且废水中银离子剩余浓度远远低于国家排放标准,说明TMT-18F对银离子的捕集效果很好。这使得TMT-18F在银离子废液处理和回收领域具有广阔的潜在应用前景。     

两模激光场振幅调制中的双光子谐振(英文)

本文利用自旋为1的算符Jx，｛Jx，Jy｝和｛Jz，Jx｝的循环交换关系，在位相差为的两模激光场振幅调制中考虑双光子谐振，得到了三能级原子的时间演化规律，并讨论粒子数俘获。     

碱金属原子的囚禁与冷却

描述了如何利用激光以及磁场构建光学粘胶、激光阱、磁阱、磁光阱等实现对碱金属的囚禁与冷却,旨在明晰的呈现BEC实验实现的关键技术、物理原理以及各种装置的优缺点.     

不整合构造对油气的控制作用

地层不整合对油气成藏具有重要作用,不整合面上下形成的油气藏均与不整合面有关。论述了不整合面结构、类型以及不整合面上下岩性配置与油气成藏的关系,得出不能合与油气成藏的关系主要表现为不整合面上、下发育的储集砂体不仅可以为油气提供良好的侧向运移通道,而且可以把不同时代的储积层、断裂等连接起来组成区域性的运移通道网络组,不整合面之上的风化粘土层还可形成良好的盖层。构造不整合可以使早先形成的油气藏的盖层被剥蚀冲刷或者对储层进行改造,导致不整合形成的油气藏发生各种稠变作用或者散失,而稠变后的原油,对晚期的油气成藏具有封堵作用。     

A hybrid neural network system for prediction and recognition of promoter regions in human genome

INTRODUCTION The publication and preliminary analysis of thehuman genome sequence (Lander et al., 2001; Venteret al., 2001) marks a significant milestone in the fieldof molecular biology. One of the main goals of theHuman Genome Project is the characterization, an-notation?recognition and categorization of genesfrom human genome to serve as a periodic table forbiomedical research (Lander, 1996). In the past fewyears, many efforts have been devoted to gene anno-tations. The Nation…