共查询到20条相似文献,搜索用时 46 毫秒
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生物学教学中的板书与板图祁乃成(北京市教育局教研部100055)板书是文字的直观,板图是图形的直观,如运用得当,不失其为优化教学的辅助手段之一。它们能使课堂教学内容的整体框架一目了然;能突出生物学基本事实的重点;能增加学生直接识记的信息数量;能调节与... 相似文献
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概念图是盛行于国外特别是欧美国家的一种教学形式。它以直观形象的方式表达知识结构,能有效呈现思考的过程及知识的关联,引导学生进行意义建构,在我国科学课程的教学设计中这一有效的策略已逐渐引起人们的关注。 相似文献
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板书是中学生物教学中最普遍而重要的一种直观教学形式。我们在组织师范生进行教育实习时,尝试了一种新的板书形式——纸贴板书,在有关内容的教学中收到了较好的教学效果。1纸贴板书的制作和演示方法1.1制作方法教师在备课时,按照教学内容列出简洁明了的板书提纲,... 相似文献
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谈生物教学板书的设计郭明章(安徽省南陵师范学校242431)板书是课堂教学的重要手段之一。精炼的板书是一种高度概括性的语言文字,语言与思维是有密切关系的。一个教师的讲课,加上流利的口表语言,附有较好的板书设计,在教学中将起到非常重要的作用。1板书的设... 相似文献
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人类已进入信息时代 ,计算机与网络技术的发展孕育并促进了崭新的网络教育模式的诞生。医学寄生虫学教学一直延用传统的教学手段 ,那就是教师讲述 ,辅以板书和挂图 ,最多就是放几张投影或幻灯片。这对于寄生虫学这门形态学课程来说教学效果一直不甚满意。而网络多媒体教学具有诸多方面的优势 ,借助多媒体技术可以把寄生虫的形态生动地展示给学生 ,配合视频演示还可以把以前只能在现场或临床新鲜标本中才能观察到的寄生虫活体呈现在课堂上。另外 ,网络教学强大的交互性、开放性、内容可不断更新、可同时把多种信息形式展示给学生等特点是其它… 相似文献
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In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980. 相似文献
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N. P. Vesselkin Yu. V. Natochin 《Journal of Evolutionary Biochemistry and Physiology》2010,46(6):592-603
Evolution of living organisms is closely connected with evolution of structure of the system of regulations and its mechanisms.
The functional ground of regulations is chemical signalization. As early as in unicellular organisms there is a set of signal
mechanisms providing their life activity and orientation in space and time. Subsequent evolution of ways of chemical signalization
followed the way of development of delivery pathways of chemical signal and development of mechanisms of its regulation. The
mechanism of chemical regulation of the signal interaction is discussed by the example of the specialized system of transduction
of signal from neuron to neuron, of effect of hormone on the epithelial cell and modulation of this effect. These mechanisms
are considered as the most important ways of the fine and precise adaptation of chemical signalization underlying functioning
of physiological systems and organs of the living organism 相似文献
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