共查询到20条相似文献,搜索用时 441 毫秒
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《高分子化学实验》课程是高等院校高分子专业本科生学习高分子科学的关键实践环节。实验课内容需与高分子化学课程中理论知识紧密联系的要求决定了实验课内容的基础性和规范性。在规定的教学内容内,培养学生动手能力,激发学生兴趣、培养学生创新思维是本实验课程教学的核心目标。本教学改革通过:(1)在既定教学内容上调节实验变量、增加实验结果未知性;(2)增加实验过程中的教师与学生、学生与学生的交流强度;(3)增加课程的平时成绩权重的成绩评定方法等改善教学效果,并通过问卷调查的形式分析和评价交互式教学效果。本文的措施和结论为高分子化学实验课程的教学提供了有益的参考价值。 相似文献
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采用多肽固相合成技术制备了寡肽序列RRRRRRRR(R8)。通过电喷雾电离质谱仪对序列的相对分子质量进行了表征。进一步通过琼脂糖凝胶电泳和细胞内吞实验考察寡肽序列在生物学研究方面的应用。本实验可以加深学生对有机化学、高分子化学及生物化学的理解与运用,培养学生分析问题和解决问题的综合能力。 相似文献
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以高分子化学实验课程为载体,将学生课外科研活动与高分子化学实验以及任课教师所在科研团队的科研成果有机结合起来,把功能高分子的设计与结构表征提前引入到高分子化学实验中,形成了一整套较为完整、具有探索性和综合性的高分子化学实验实施方案。以α,ω-羧基聚二甲基硅氧烷(α,ω-羧基硅油)的可控合成为例,通过引导本科生独立地进行文献检索、实验方案设计、材料合成和结构表征及实验报告撰写,既提高了他们利用已学的有机化学和高分子化学知识进行综合分析的能力,又培养了其查阅文献、分析文献和形成创新性思维的能力。 相似文献
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利用手持技术改进测定乙醇分子结构实验 总被引:1,自引:0,他引:1
利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。 相似文献
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V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1989,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988. 相似文献
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Mustafa R. Ibrahim Zacharia A. Fataftah Paul von Ragu Schleyer Peter D. Stout 《Journal of computational chemistry》1987,8(8):1131-1138
Sets of hydrogen molecule equivalents have been developed which permit the calculation of hydrogenation of different types of carbon-carbon bonds from ab initio total energies (3-21G and 6-31G* basis sets, and, to a more limited extent, for MP2/6-31G* data) of reactants and products. The calculated enthalpies of hydrogenation are in good agreement with experiment for unstrained molecules, with average errors on the order of 2 kcal/mol. The 6-31G* equivalents allow the enthalpies for strained molecules to be calculated accurately, but the 3-21G equivalents do not. The equivalents for both basis sets have been tested by calculating the enthalpies of hydrogenation of carbon-carbon bonds in nitrogen- and oxygen-containing organic molecules, free radicals, and classical carbocations. The results are in good agreement with experiment in most cases. 相似文献
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V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1988,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae. 相似文献
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由于石化行业的生产需要,其材质的使用具有多样性和广泛性,经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识,根据光谱仪的测试能力及标样的采集,实现了一个或几个元素测量范围的扩展,并对其测量的影响因素进行了研究。 相似文献