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分析了初中化学微粒观的教学内容和“原子的结构”的相关教学设计,针对学生“微粒观”建构存在的难题,提出利用反馈机制,采用“寓教于乐”的游戏化教学设计,并进行实践效果访谈。不仅完成了本课时的教学目标,也让学生对化学的兴趣更加浓厚。 相似文献
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正中学化学教材中的"引导语"指的是每个单元的开篇之作、点睛之笔,它既是教材必不可少的组成部分,又是统领各个单元的纲领性文字。引导语的存在既能为学生的学习提供基本的框架和思路,又能对教师教学起到引导作用。其功能包括:引导学生明确学习方向的导向功能,激发学生学习兴趣的激励功能,作为先行组织者去检验学生学习情况的检测功能。教材中的引导语非常重要,但我国对于此方面的研究甚少。因此, 相似文献
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橙花素的催化合成研究 总被引:4,自引:0,他引:4
将研制得的季鏻盐型高聚物相转移催化剂用于橙花素(即β-萘乙醚)的催化合成。研究结果表明,在β-萘酚∶溴乙烷为1∶1.3(摩尔比),通N2保护,反应温度为75℃,反应时间为5 h的条件下,可获得81.7%的收率。此法具有操作简便、反应温和、催化剂能重复使用、效果良好的优点。 相似文献
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Betahistine drugs are widely used in vestibular compensation process. For the understanding of drugs' structural feature, two betahistine drugs'(betahistine hydrochloride and betahistine methanesulfonate) structure and vibrational spectra were calculated within density functional theory(DFT) method and comparisons have been made with histamine. The drugs' interactions with the receptors were revealed by using the molecular docking methods. The results show that the discrepancies of pharmacodynamic property would be resulted from minor molecular structure difference, and the vibrational spectra can be used for monitoring the drugs' metabolization. Generally, betahistine drugs have better performance in the docking patterns with receptors, like stronger interactions, forming more hydrogen bonds with receptors than histamine, and the betahistine methanesulfonate is found out to be the best for body recovery as it did in clinical presentation. 相似文献
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