非离子态氨对转“全鱼”生长激素基因鲤鱼的急性毒性和慢性毒性

在自然水体和人工水体中氨氮对鱼类是有毒的.利用静水更新式生物测试研究了非离子态氨对转基因鲤鱼和对照鱼的96h急性毒性实验和21d慢性毒性实验.通过96h非离子态氨急性毒性实验发现,转基因鲤鱼的非离子态氨氮24,48,72和96h半数致死浓度(LC50)(2.64,2.44,2.28和2.16mg/L)分别比对照鲤鱼相应的24,48,72和96h半数致死浓度(LC50)(2.70,2.64,2.52和2.33mg/L)略低,没有显著性差异;但在不同非离子态氨氮(3.86,3.29和2.09mg/L)胁迫下

SPATIAL OPTIMIZATION STRATEGY FOR XIAOCHI IN HUBEI PROVINCE IN THE VIEW OF INTEGRATING NEIGHBORING CITIES OF JIUJIANG AND HUANGMEI

同城化是"从区域论城市"基础上形成的一种新的城市区域发展观。在湖北小池滨江新区上升为"省级战略"之际,从政策主导、内生驱动、外借助推、资源聚合等4个方面分析小池南望融入九江同城发展的动力。结合相关数据分析指出,在"中四角"地理中心与"鄂东门户"耦合的特殊区位条件下,小池发展面临区位优势转化难、产业定位游离、城镇化动力不足、空间风貌特色欠缺等问题,并从九江、黄梅"同城共建、拥江共享、错位共赢"3个维度指出,位于鄂东前沿阵地的小池城镇空间需要重点从构建完善的公共服务设施体系和基础设施网络、提升拥江发展的梯次空间品质、聚合错位发展的产业布局等方面调控优化,以彰显两地的同城化效应,带动鄂东门户地带的发展。Urban area integration is a new form of regional development based on the concept of "city-region." This paper analyzes the driving force for integrating Xiaochi into its neighboring Jiujiang City from the four aspects of the macroeconomic policy, the internal driving force, the external boosting power, and the endogenous resources aggregation, hoping to facilitate the development of Xiaochi Riverside District as it has risen as the "provincial strategy." Statistical analysis reveals that major challenges in Xiaochi, a town located in the center of the so-called "four corners in central China" as well as at "the gateway of eastern Hubei Province," consist of diffi culty in exploiting regional features, random industry positioning, feeble driving force for urbanization, and lack of spatial characteristics. This paper proposes a spatial optimization strategy to overcome the above challenges based upon the principles of "building as one city, co-sharing resources along the Yangtze River, and win-win via dislocation development" for the development of Jiujiang and Huangmei cities. In detail, Xiaochi, as a forefront located in eastern Hubei Province, should focus on boosting the public facility system and infrastructure network, enhancing the quality of its riverside echelon spaces, and optimizing dislocation development of the industrial layout. By doing so, the effect of urban area integration is expected to be highlighted to promote the development of the portal area in the eastern Hubei Province.国家自然科学基金项目(51478199);; 高等学校博士学科点专项科研基金项目(20120142120013

改革开放40年中国城乡规划教育发展

改革开放40年来中国规划教育发展过程及经验是国内外规划教育界共同关注的问题。文章采用综合分析方法,总结中国规划教育40年发展演变路径,可以发现,伴随着城市规划实践由\"物质形态规划—综合战略规划—资源管理型规划\"的发展,规划教育也经历了\"建筑基础—城市科学基础—多学科融合\"的规划教育嬗变过程,40年规划教育发展高度契合国家发展战略要求,并具有鲜明的实践需求导向,现阶段国家空间规划体系重构将对未来规划教育发展产生重要影响。国家自然科学基金重点项目(51538004);国家自然科学基金面上项目(51478199);国家自然科学基金青年项目(51708471

Four newly recorded species of Bacillariophyta from the mangroves in China

报道了来自福建和深圳红树林下中国首次记录的4种硅藻,即瓜形桥弯藻CymbellacucumisA.Schmidt、拟优美舟形藻NaviculaelegantoidesHustedt、侧偏舟形藻N.platyventrisMeister和柔弱舟形藻N.teneraHustedt,同时描述了每个种类的细胞形态特征和生态分布特点。作者认为淡水硅藻瓜形桥弯藻C.cucumis在半咸水和海水的环境中也有分布(盐度>15),应属于淡水和半咸水种。 【英文摘要】 Four species of diatoms from the mangroves in Fujian Province and Shenzhen City of China are described. They are Cymbella cucumis A. Schmidt, Navicula elegantoides Hustedt, N. platyventris Meister, and N. tenera Hustedt. They represent new records for China. Detailed description of the taxonomic characters of the four species and of their ecological behavior is given. Cymbella cucumis was defined as a freshwater and brackish water species for it occurred, though occasionally, where water salinity was more t...Supported by the National Natural Science Foundation of China, Grant Nos. 30270118, 40476055, 30499340, and Project of innovation foundation of Xiamen University, Grant No. XDKJCX2004101

Four newly recorded species of Bacillariophyta from the mangroves in China

报道了来自福建和深圳红树林下中国首次记录的4种硅藻,即瓜形桥弯藻CymbellacucumisA.Schmidt、拟优美舟形藻NaviculaelegantoidesHustedt、侧偏舟形藻N.platyventrisMeister和柔弱舟形藻N.teneraHustedt,同时描述了每个种类的细胞形态特征和生态分布特点。作者认为淡水硅藻瓜形桥弯藻C.cucumis在半咸水和海水的环境中也有分布(盐度>15),应属于淡水和半咸水种。 【英文摘要】 Four species of diatoms from the mangroves in Fujian Province and Shenzhen City of China are described. They are Cymbella cucumis A. Schmidt, Navicula elegantoides Hustedt, N. platyventris Meister, and N. tenera Hustedt. They represent new records for China. Detailed description of the taxonomic characters of the four species and of their ecological behavior is given. Cymbella cucumis was defined as a freshwater and brackish water species for it occurred, though occasionally, where water salinity was more t...Supported by the National Natural Science Foundation of China, Grant Nos. 30270118, 40476055, 30499340, and Project of innovation foundation of Xiamen University, Grant No. XDKJCX20041018

HLA-DRB1、-DQB1基因多态性与食管鳞癌遗传关联性

目的　从基因水平探讨食管鳞癌HLA DRB1 , DQB1等位基因的遗传易感性 ,以阐述其免疫遗传学特征。方法　运用序列特异性引物聚合酶链反应技术 ,检测无亲缘关系湖北汉族健康人 1 36例、食管鳞癌患者 42例的HLA DRB1 , DQB1等位基因。结果　湖北汉族人食管鳞癌患者与正常人比较 ,HLA DRB1 0 90 1等位基因分布频率显著增高 (0 .2 50 0比 0 .1 397,P =0 .0 2 8,OR =2 .0 53 ,病因分数 =0 .1 2 82 ) ,HLA DQB1 0 3

Reconstruction and Simulation Method and Its Implementation for GuQin Tamber

为促进古琴艺术的传播,通过对古琴音色的分析,在建立古琴音色库的基础上,从古琴琴弦振动理论和音律学理论入手,利用傅立叶变换分析了古琴音色的频谱特征,并基于加权柯西函数,给出了重构古琴音色的策略。然后,通过采用基于音色数据库和音色重构两种方法,对古琴音色进行计算机仿真,建立了一个初步的古琴音色仿真系统。实验证明,通过重构音色进行仿真的计算方法,是古琴音色仿真的一种有效方法。A Guqin timbre base was introduced through timber analysis and its spectrum specification was analyzed using Fourier transformation based on theory of Guqin srting vibration and temperament.Then a reconstruction method for Guqin timbre was proposed based on weighted Cauchy function.Finally a timbre simulation system for Guqin was worked out using timbre database and reconstruction.It has been proved by experiment that the computing method of timbre reconstruction is effective for Guqin timbre simulation

基于DEA模型分析我国公立医院运行效率

目的运用数据包络分析方法评价我国公立医院运行效率及变化,为公立医院提高运行效率、进一步完善和优化卫生资源配置提供决策依据。方法选取2011-2015年《中国卫生统计年鉴》等统计资料中的数据,采用数据包络分析法的CCR模型在规模报酬不变情况下计算综合效率值、BCC模型在规模报酬可变情况下计算纯技术效率值和规模效率值,对全国公立医院的运行效率进行分析,并通过Malmquist模型对生产效率变化趋势进行分析。结果 2014年全国31个省市公立医院平均综合效率值为0.887,综合效率值为1即DEA有效的省市10个,处于规模效率不变状态,其他省市是DEA非有效且处于规模效率递减状态;DEA有效省市主要集中在东部和西部;26个(83.88%)省市公立医院全要素生产率提高;非DEA有效省市若达到DEA有效可节省大量卫生资源投入、获得更多医院产出。结论近五年我国公立医院管理和技术方面效率有很大提高,但由于医院规模扩张过快反而降低了医院运行效率。适度的规模更有利于公立医院效率的提高,应该控制大型公立医院的发展规模,引导医院提高医疗技术和管理水平,促进内涵式发展,改善服务、改进管理,从而提高效率。国家自然科学基金项目(71403229

Effect of Sodium D-Gluconate-Based Inhibitor in Preventing Corrosion of Reinforcing Steel in Simulated Concrete Pore Solutions

应用电化学技术,结合扫描电子显微镜(SEM)观测,研究d-葡萄糖酸钠、钼酸钠和硫脲三组分复合缓蚀剂对模拟混凝土孔隙液中钢筋腐蚀行为的影响及其阻锈作用.结果表明:在含3.5%(W)nACl的模拟混凝土孔隙液中,复合缓蚀剂具有协同效应,对钢筋有良好的阻锈作用.当d-葡萄糖酸钠、钼酸钠和硫脲浓度分别为750、250和500Mg·l-1时,对钢筋的缓蚀效率可达到94.5%.应用软硬酸碱(HSAb)理论分析缓蚀机理,可认为三组分复合缓蚀剂在钢筋表面共同形成保护膜而阻止钢筋的腐蚀.The corrosion behavior of reinforcing steel in simulated concrete pore solutions with and without corrosion inhibitors was studied by electrochemical techniques and scanning electron microscopy(SEM).A combined inhibitive effect of sodium D-gluconate,Na2MoO4 and thiourea on restraining the corrosion of reinforcing steel immersed in the solution was observed.This result showed that there was a synergetic effect among the three agents in corrosion prevention.After adding the compound inhibitor(750 mg · L-1 sodium D-gluconate,250 mg · L-1 Na2MoO4,500 mg · L-1 thiourea) into the simulated concrete pore solution containing 3.5%(w) NaCl,the inhibition efficiency of the compound inhibitor was 94.5%.According to the Hard and soft acids and bases(HSAB) theory,the compound inhibitor worked by forming a protective film on the steel surface.国家自然科学基金(21073151;21173177;50731004;21021002)资助项---