谈化学教学中的结课艺术

恰到好处地“结课”,或设置悬念、或归纳总结、或提出问题,是影响化学教学成功与否的因素之一.本文针对“结课”,从结课的功能和几种常见的结课方式两方面来展开论述,从而说明化学教学需要结课艺术.     

茶多酚(TP)清除活性氧自由基■作用的研究

应用黄嘌呤/黄嘌呤氧化酶-Luminol反应系统,以化学发光法研究了茶叶中抗氧化成分——茶多酚的清除活性氧自由基■作用.结果显示,TP-1(常规工艺茶多酚)和TP-2(N1043730A专利工艺茶多酚)在0.013～0.375μg/ml均表现很强的清除自由基■作用,TP-1和TP-2对自由基。■50％抑制浓度(IC_(50))分别为0.011μg/ml和0.004μg/ml,清除自由基作用与剂量呈高度相关(r分别为0.987和0.963).对TP-1和TP-2的儿茶素组分进行了定量分析,并讨论了组分与清除自由基作用的关系.本文结果表明茶多酚(TP)具有很强的清除自由基■作用,可以作为一种较好的自由基清除剂加以研究和应用.     

数科学高效课堂,还看“趣味”导入

随着时代的开放与进步,现代中学生的视野更加开阔、思维更加活跃,教师面临的教育内容也愈发丰富起来。面对纷繁复杂的教育任务时,教师首要应该做的是静下心,思考怎样才能在有限的课堂中吸引学生的目光,让课堂因我们的安排而妙趣横生,从而轻松达成高效课堂。唯有如此,教师才能以不变应万变,跳出单一的填鸭式教学、出大力无功返的困顿局面,并能自然而然地赢得学生的尊敬、家长的拥护以及社会的支持。     

供应商和客户参与技术创新对创新绩效的影响

以广东省电子信息行业的286家企业为研究对象,探讨了供应商与客户参与技术创新对企业创新绩效影响,以及技术复杂性在供应商与客户参与技术创新和创新绩效关系中的调节效应。结果表明,供应商参与技术创新和客户参与技术创新对创新绩效均有显著的正向影响,技术复杂性对供应商参与技术创新与创新绩效间关系有显著的调节作用,但是对客户参与技术创新与创新绩效间关系的调节作用不显著。     

基于社交网站的国内银行电子服务研究

社交网站是开展电子服务的新平台,将其引入电子服务研究,有利于服务价值提升与服务创新。本文基于对国内银行业的调查数据,揭示现有银行业利用社交网站平台开展电子服务活动的具体内容、存在的优势及不足,并给出具体优化建议。研究结论为银行业电子服务的改进提供参考和借鉴,同时为其他行业利用新媒体开展电子服务提供思路。     

应用“点线面分析法”提高空间想象能力

组合体的读图与画图在工程制图课程中是重点和难点,正确理解投影面垂直面的“类似形”投影是关键。文中作者提出用“点线面分析法”来求解“类似形”。综合应用“点线面分析法”和“形体分析法”,能够帮助学生识读和绘制组合体,并提升学生的空间想象能力。     

体验式教学在独立学院心理健康教育课程中的研究与应用

心理健康教育课程是提高大学生心理素质的有效途径,也是当前高校开展心理健康教育的主要手段。本文主要探讨了体验式教学在当前独立学院心理健康教育教学中的应用优势,并分析其应用于独立学院心理健康教育课程的必要性与可行性,提出相应的改进建议。     

Dietary Fats and Oxidative Stress: A Cross-Sectional Study Among Coronary Artery Disease Subjects Consuming Coconut Oil/Sunflower Oil

Coconut oil has been used by the people of Kerala as a cooking medium for several decades. Due to its alleged hypercholesterolemic activity, general population in recent times is shifting to cooking oils rich in polyunsaturated fats, the most popular being sunflower oil. The effect of long-term consumption of sunflower oil on oxidative stress in humans is not well investigated. We studied oxidative stress among coronary artery disease (CAD) patients who were consuming coconut oil or sunflower oil as a part of their routine diet. Men, aged 35–70 years, with established CAD, who presented to the hospital for routine cardiac evaluations, were enrolled in this observational study. Group 1 and 2 consisted of 73 and 80 subjects consuming coconut oil and sunflower oil respectively for over a period of 2 years. Lipid profile and parameters for oxidative stress were evaluated among them. Conventional lipid parameters did not differ significantly between the two groups. Mean vitamin C concentration was significantly reduced for subjects on sunflower oil compared to those consuming coconut oil (P = 0.044). Malondialdehyde was higher for sunflower oil consumers compared to coconut oil consumers (P < 0.0001). Other parameters such as oxidized LDL, GSH, GPx and SOD were not found to be significantly different between the two groups. The results of the present study show that coconut oil did not induce hypercholesterolemia compared to sunflower oil. On the other hand, sunflower oil group had elevated oxidative stress compared to coconut oil group.     

A Narrative Review of Potential Future Antidiabetic Drugs: Should We Expect More?

Prevalence of diabetes mellitus, a chronic metabolic disease characterized by hyperglycemia, is growing worldwide. The majority of the cases belong to type 2 diabetes mellitus (T2DM). Globally, India ranks second in terms of diabetes prevalence among adults. Currently available classes of therapeutic agents are used alone or in combinations but seldom achieve treatment targets. Diverse pathophysiology and the need of therapeutic agents with more favourable pharmacokinetic-pharmacodynamics profile make newer drug discoveries in the field of T2DM essential. A large number of molecules, some with novel mechanisms, are in pipeline. The essence of this review is to track and discuss these potential agents, based on their developmental stages, especially those in phase 3 or phase 2. Unique molecules are being developed for existing drug classes like insulins, DPP-4 inhibitors, GLP-1 analogues; and under newer classes like dual/pan PPAR agonists, dual SGLT1/SGLT2 inhibitors, glimins, anti-inflammatory agents, glucokinase activators, G-protein coupled receptor agonists, hybrid peptide agonists, apical sodium-dependent bile acid transporter (ASBT) inhibitors, glucagon receptor antagonists etc. The heterogeneous clinical presentation and therapeutic outcomes in phenotypically similar patients is a clue to think beyond the standard treatment strategy.     

基于AMBA总线的DMA控制器设计

给出了基于AMBA2.0总线的DMA控制器的RTL级设计,并搭建了SoC仿真平台进行功能仿真,最后进行了FPGA原型验证.在100MHz的工作频率下,仿真和验证结果表明,本设计可以满足功能和性能的要求.