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化学是一门以实验为基础的自然科学。化学实验的重要作用是有利于学生对物质及其变化获得鲜明的具体的印象,认识变化的条件和规律,为教师讲授和学生理解、加深、巩固化学知识所不可缺少的重要环节,也是学生获得实验技能技巧的途径。同时还在教师的示范指导下,学会观察、分析、综合、抽象、概括得出结论。培养学生观察能力、思维能力以及培养他们严谨的科学态度。 中学化学实验就其形式,主要分为教师的演示实验,学生的分组实验,实验习题和复习实验等形式。在化学教学过程中,要根据教学目的,教学内容特点和学生知识基础,充分利用学校的设备条件,加强化学实验的教学,进一步培养学生的学习兴趣和提高化学教学质量。 相似文献
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引导发现法,就是教师凭借着经过科学处理的教材与相应的教学手段,遵循学生的认识规律、智力发展规律与学习语文的规律,把教学过程划分为一个个引导发现过程,使学生在探索性学习中获得知识、学会读书方法、形成语文能力并达到发展智力的要求。 相似文献
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加强对大学生的社会主义荣辱观教育,是当前思想道德建设的重要任务之一。为了更好地对大学生进行社会主义荣辱观教育,必须将“八荣八耻”的社会主义荣辱观渗透到大学生思想政治理论教育中去,渗透到高校制度建设中去,渗透到对大学生价值观的引导和教育中去,渗透到校园文化建设中去,融入到实践体验活动中去。 相似文献
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The production of elastase by Bacillus sp. EL31410 at various temperatures was investigated. In order to study the effect of temperature on elastase fermentation, different cultivation temperatures, ranging from 39 ℃ to 28 ℃, were evaluated in shake flask. The result indicated that 37 ℃ was best for cell growth at earlier stage; while maximum elastase activity was obtained when the cells were cultivated at 30 ℃. This result was verified by batch fermentation in 5-L bioreactor under 37 ℃ and 30 ℃ temperature, respectively. The specific cell growth rate at 37 ℃ was higher than that at 30 ℃ latory temperature cultivation mode were evaluated in the next study. When compared to single temperature of 37 ℃ or 30 ℃, both two-stage temperature shift strategy and oscillatory temperature strategy improved biomass but did not yield the same result as expected for elastase production. The maximum biomass (both 8.6 g/L) was achieved at 30 h at 37 ℃, but at 42 h using two-stage temperature cultivation strategy. The highest elastase production (652 U/ml) was observed at 30 ℃ in batch process. It was concluded that cultivation at constant temperature of 30 ℃ was appropriate for elastase production by Bacillus sp. EL31410. 相似文献
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问题是思维的起点,是创新的前提。加强学生问题意识的培养,是创新教育的重要课题。本文在阐释研究生问题意识培养重要意义的同时,着重从知识功底、教学氛围、创造个性、情景设置及培养评价方面,对研究生问题意识培养的路径进行了探讨。 相似文献