Growth rate, catalase and superoxide dismutase activities in rock carp (Procypris rabaudi Tchang) exposed to supersaturated total dissolved gas

Total dissolved gas supersaturation (TDGS) appears when the pressures of gases in a solution exceed the barometric pressures. TDGS is often caused by flood discharge at dams. It may lead to gas bubble disease (GBD) for fish and biochemical responses of selected fish and other aquatic organisms. The purpose of this study was to determine the impact of long-term TDGS levels on the growth and biochemical responses of rock carp (Procypris rabaudi Tchang) dwelling in the upper reaches of the Yangtze River. Three-year-old rock carp were exposed to TDGS levels at 100%, 104%, 108%, 112%, and 116% for 42 d. Samples were taken every 7 d after the start of the trial in order to determine catalase (CAT) and superoxide dismutase (SOD) activities in gill and muscle tissues. Samples were taken at Days 0 and 42 of exposure to determine growth rate. Little effect was found on growth rate in all treatment groups. SOD and CAT activities varied in different tissues, according to time of exposure and TDGS levels. The biochemical response of fish exposed to TDGS was more obvious in gill tissue than in muscle tissue. Surveys of SOD and CAT activities in different tissues offer important information about the effect of TDGS on the rare fish in the Yangtze River, and may help evaluate the risk to the aquatic eco-environment and aquatic ecosystem in the downstream of the Yangtze River.     

Iptakalim, an ATP-sensitive potassium channel opener, confers neuroprotection against cerebral ischemia/reperfusion injury in rats by protecting neurovascular unit cells

Objective  

To investigate the role of iptakalim, an ATP-sensitive potassium channel opener, in transient cerebral ischemia/reperfusion (I/R) injury and its involved mechanisms.     

Systematic studies on scan and driving model for flat panel display

Aiming at the time redundancy in the flat panel display (FPD) imaging process, the paper studied some problems for FPD gray scale controlling based on the fractal theory, dissertates the construction of the space-time mapping topology architecture, the proposition of optimal scanning structure for FPD’s gray imaging, and the creation of the fractal theoretic model. Then the logic implementation and system application are presented based on the fractal model of the optimal scan architecture, and the application results achieved target of eliminating time redundancy and increasing the scanning availability. The novel control mode that the fractal scanning IP core described with Verilog language embedded in the FPGA hardware frame can efficiently increase the imaging gray scales and quality in the FPDs scanning controller and speed up the frame frequency of display system.     

当前网络教育舆情的话语分析——以人民网和新浪教育论坛为例

通过对2008-2010年人民网和新浪网教育栏目的样本选择、类目建构、频数统计和内涵解读等话语分析方法,揭示当下民众的教育心态、期待、诉求和价值判断,并根据词频结果进行话语解读,为更加民生化的教育政策制定与执行提供数据支持和建议。     

试论《麦田里的守望者》中的修辞格

在《麦田里的守望者》中,作者塞林格巧妙运用明喻、隐喻、平行结构和夸张四种修辞格,以此表达内心的强烈情感,并使文章取得极强的艺术效果,也充分显示出了修辞格的魅力。     

优化学生认知结构的课堂教学策略

认知结构是影响学生学习的基础因素之一,构建良好的认知结构是学科教学的重要任务。从课堂教学实践角度,探讨认知结构与学科教学的关系,提出五种优化学生认知结构的课堂教学策略,以期为新课程改革提供支持、为一线教师教学实践服务。     

循证教育学视野下的信息技术教学实效方案

循证是从群体到个体,从普遍到特殊,寻找经验理论证据,而审慎、明智地做出实践决策的过程。循证教育学（Evidence-Based Education）是沟通教育实践和理论的桥梁。笔者基于循证教育学视野下探析闽南农村中学信息技术教学现状现存问题,循证于已有的教育科学理论经验证据,从而提出并论证提高闽南农村中学信息技术教学实效性方案。     

心理契约在促进高职院校青年教师心理稳定性中的重要意义

高职院校青年教师在成长发展过程中不稳定的心理状态影响制约了学校师资队伍建设进程,在青年教师成长的不同阶段,利用心理契约对其实行心理干预,实施柔性化管理,促进其个体成长发展与学校发展和谐统一。     

文化自觉与高校人文精神教育

高校的人文精神教育不被重视,在一定程度上使大学成了职业训练所,不利于学生人格和心灵的培养。厘清大学的本质及使命,改革教育体制,培养学生的文化自觉意识,加强人文精神教育,发挥经典阅读课程在人文精神教育中的作用,真正培养出能够融通中方与西方传统与现代文化,兼具科技人文精神的现代化新人。     

试论电子商务时代的物流体系建设

电子商务作为一种全新的经营模式，其发展面临许多问题，如电子商务的安全问题、法律问题、税收问题等，但是中国的物流体系发展滞后将是影响中国电子商务快速发展的一个主要问题。1现代物流是电子商务发展的基础1.1物流系统的特点 物流是指为了满足客户的需求而进行的起点到终点的原材料、中间产品过程库存、最后产品和相关信息有效流动和储存的计划、实施和控制管理过程。与传统的运输系统相比，物流系统有其自身的特点。