窖水中主要无机离子对光催化灭除大肠杆菌(E.coli)的影响研究

采用自主开发的N-TiO_2作为光催化剂,在流动相光催化反应装置中,对窖水中所含Ca~(2+)、Cl~-、CO_3~(2-)、HCO_3~-、SO_4~(2-)等主要无机离子对光催化剂灭除E.coli的影响,以及复配模拟窖水和实际窖水对光催化灭除E.coli的影响进行了实验研究,并分析了其影响机理。实验结果表明:Ca~(2+)、HCO_3~-对光催化灭除E.coli有抑制作用,CO_3~(2-)对光催化灭除E.coli有明显的促进作用,而SO_4~(2-)、Cl~-对光催化灭除E.coli无影响。在对实际窖水进行光催化灭除E.coli菌落总数的实验中,经60min反应,窖水中菌落总数和总大肠菌群均为零,达到国家饮用水卫生标准,说明自主开发的NTiO_2光催化剂在农村窖水深度处理灭除E.coli效果好,可推广应用。     

A perspective on fish gonad manipulation for biotechnical applications

Fish make attractive candidates for conducting stud- ies in gene expression, regulation, function, and genetic modification, since they reach sexual maturity rela- tively quickly, are highly fecund, utilize an external fertilization strategy, develop exte…     

Time course of foreign gene integration and expression in transgenic fish embryos

Using a nuclear transplantation approach, the integration and expression of the green fluorescent protein (GFP) gene in the embryogenesis of transgenic loach (Misgurnus anguillicaudatus Cantor) have been studied. TheGFP gene expression is first observed at the gastrula stage, which is consistent with the initiation of cell differentiation of fish embryos. The time course of the foreign gene expression is correlated with the regulatory sequences. The expression efficiency also depends on the gene configuration: the expression of pre-integrating circular plasmid at early embryos is higher than that of the linear plasmid. The integration of theGFP gene is first detected at the blastula stage and lasts for quite a long period. When two types of different plasmids are co-injected into fertilized eggs, the behavior of their integration and expression is not identical.     

DNA打开生命之门 —— 遗传、发育与进化

DNA分子双螺旋结构的揭示直接引导现代生命科学的基础理论——中心法则建立。在过去的短短的50年中,生命科学发生了“脱胎换骨”的变化,几乎所有的传统生命科学分支学科都获得了长足的进步,许多新兴的生物学分支学科和边缘学科相继建立,生物学技术引发了社会产业结构的深刻变革,许多生物学观念也已经渗透到社会生活的各个方面,它所打开的探索生命奥秘之门将继续引领人们去挑战更多的未解的生命之谜。     

Transgene for growth hormone in common carp（Cyprinus carpio L.） promotes thymus development

The transgenic carp were produced by micro-injection of CAgcGHc into the fertilized eggs. Observation of the thymus development between the transgenics and non- transgenic controls was carried out. The thymus of one-year- old transgenics F1 showed a great increase in both size and weight. The unilateral thymus of the transgenics weighed from 190 to 295 mg with average 218.6 mg, whereas the uni-lateral thymus of the controls weighed 20—81 mg with av-erage 42.5 mg; i.e. the thymus weight in the transgenics was 5.14 fold over that in the controls. The index of thymus/body weight in the transgenics was 2.97 fold over the controls. Light microscopy observation indicated that the thymus of the transgenics well developed with the thickened outer re-gion and compactly arranged thymocytes, while the thymus in the controls were degenerating with the thinned outer region, scattered thymocytes and groups of fatty cells. Fur-ther analysis with the electron microscopy revealed that pro-liferous cells in the transgenics were mainly small lympho-cytes and no pathological changes were found. The results confirmed that the 揂ll-fish?GH-transgene promotes thy-mus development and thymocyte proliferation, and retards thymus degeneration. The study has laid a foundation for further analysis of the immunobiological function in GH- transgenic carp.     

光催化深度水处理设备的研究进展

随着水源水微污染和水体富营养化问题日益严重,采用光催化氧化技术处理污染水体受到研究者的广泛关注,特别是研制高效的光催化深度水处理设备。文章介绍了国际研究领域光催化反应器的发展,对国内悬浮式和负载型光催化水处理设备的相关专利进行综述,最后对悬浮式、固定相及流动相光催化水处理设备存在的问题及解决的有效途径进行了分析和展望。     

努力创建国家学术期刊平台

改革开放以来,中国政府对科学技术的发展十分重视.在政策上对科技的支持不断加大,在财力上对科技投入的力度也在不断提高,中国用于R＆D的经费占GDP的比率,由2000年的0.90%上升至2007年的1.49%,R＆D经费数额由895.7亿元上升至3 664.0亿元,年均递增44.2%.其中基础研究经费投入由46.7亿元上升至180.0亿元,年均递增40.8%.据不完全统计,目前中国高校拥有正、副教授以上人员约41.3万人,全时的高级R＆D人员约23.1万人;2006年中国产出的科研论文约17.2万篇,占当年世界总数的8.4%.仅次于美国;2006年SCI检索的中国科技论文数量为7.1万篇.占世界总数的5.9%,在SCI所统计的150余个国家和地区中位列第5位.     

浅谈低压电动机轴承的故障分析与检修工艺

文章通过对牡丹江第二发电厂#5、#6机组苏制电动机在运行中出现的轴承故障进行针对性分析,提出了改进措施,并对轴承的原理、检修工艺、标准、日常维护方面进行了详细阐述.     

试析吴宓的和谐论

作为20世纪30年代中国文化保守主义重要派别——学衡派的领军人物，吴宓珍视祖国的传统文化遗产，尤其是传统的道德与人格论。在融合了美国白壁德为代表的新人文主义后，他认为只有在道德的约束下，人的本性才不至于走向欲望的极端，人类才能找到传统文化与现代文化的结合点，物质文明与现代文明才能达到一种和谐状态。概言之，即借助于道德，使人的内在与外在趋于理想中的和谐。