共查询到20条相似文献,搜索用时 46 毫秒
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基于高中生物学课程资源,利用基于项目的学习思路,融合科学、技术、工程和数学(STEM)为学生提供实践科学探究的机会。依据分析学校环境与学生需要、分析高中生物学课程的适宜资源、组织课上与课下的衔接内容、学生成果的评价与分析的思路进行项目设计与实践,以"尿糖试纸的设计"和"植物插条生根的实验探究"为案例进行展示,体现本研究的成果与价值。 相似文献
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密切联系实际,加强学生应用微生物技术能力的培养——高等农业院校植物生产类和资源环境类专业微生物学课程教学浅谈 总被引:2,自引:0,他引:2
《农业微生物学》既是高等农业院校植物生产类和资源环境类专业的专业基础课程,也是和应用微生物技术密切相关的课程。多年的教学实践表明,只有在教学中密切联系实际,强化学生应用微生物技术能力的培养,才能让学生既熟练掌握普通微生物学基础知识和基本技能,又能拓宽知识面,激发学生的学习兴趣。同时,根据人才培养方案、就业形势以及社会需求开设《实用微生物技术》和《食用菌生产》等选修课程,既满足学生对微生物实用技术学习的需要,也为生产企业培养了技术人员。 相似文献
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采集和制作植物标本,是学习和研究植物学的重要方法之一。学生在学习植物学时,应该及时地学会采集和制作植物标本的基本技能。人民教育出版社今年出版的初级中学课本植物学,将采集和制作植物标本列为实验课题之一。它明确地向中学生物学教师提出了培养学生采集和制作植物标本的基本技能的教学任务。现将我们对这一实验课题教学法的一些看法提出,以供同志们的参考。 相似文献
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新教师上好植物细胞工程课程的几点思考 总被引:5,自引:0,他引:5
植物细胞工程是高等院校生物类专业开设的专业课,该课程具有很强的实践性,笔者经过三年多的教学实践认为,针对不同的学生需要制定相应的教学策略,并通过自身的不断学习提高业务水平,改进教学方法,理论结合实际才能很好的将植物细胞工程的理论和方法传授给学生。 相似文献
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Although the importance of the endosperm as a food store inmany angiosperm seeds is well known, its significance duringearly embryogenesis has been neglected. In many interspecifichybrids, and in some other situations, embryos do not developfully and abort. It has often been stated that this is causedby the endosperm failing to conduct sufficient nutrients tothe embryo, but seldom has it been suggested that the endospermactively controls most of the early stages of morphogenesisof the embryo. Information gleaned from a broad survey of theliterature, combined with additional evidence presented here,obtained fromSolanum incanumand interspecific hybrids, indicatethat the endosperm is dynamic and very active in regulatingearly embryo development. This requires highly integrated geneticcontrol of rapidly changing metabolism in the endosperm. Ininterspecific hybrids, lack of coordination may cause unbalancedproduction of growth regulating substances by the endospermand hence abortion of the embryo, or even unregulated productionof nucleases and proteases resulting firstly in autolysis ofthe endosperm and then digestion of the embryo. The endospermmay thus serve to detect inappropriate hybridization of speciesor ploidy levels and so prevent waste of resources by producingseeds that would result in sterile hybrids or unthrifty subsequentgenerations. This discriminatory function of the endosperm hasdiminished during evolution and domestication of the crop plantSolanummelongenaL.Copyright 1998 Annals of Botany Company Solanum, embryo morphogenesis, endosperm, hybrid, seed development. 相似文献
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Höpfl G Ogunshola O Gassmann M 《American journal of physiology. Regulatory, integrative and comparative physiology》2004,286(4):R608-R623
For most organisms oxygen is essential fo life. When oxygen levels drop below those required to maintain the minimum physiological oxygen requirement of an organism or tissue it is termed hypoxia. To counter act possible deleterious effects of such a state, an immediate molecular response is initiated causing adaptation responses aimed at cell survival. This response is mediated by the hypoxia-inducible factor-1 (HIF-1), which is a heterodimer consisting of an alpha- and a beta-subunit. HIF-1 alpha protein is stabilized under hypoxic conditions and therefore confers selectivity to this response. Hypoxia is characteristic of tumors, mainly because of impaired blood supply resulting from abnormal growth. Over the past few years enormous progress has been made in the attempt to understand how the activation of the physiological response to hypoxia influences neoplastic growth. In this review some aspects of HIF-1 pathway activation in tumors and the consequences for pathophysiology and treatment of neoplasia are discussed. 相似文献
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环腺苷酸应答元件结合蛋白与学习记忆 总被引:2,自引:0,他引:2
环腺苷酸(cAMP)应答元件结合蛋白(cAMP response element binding protein,CREB)是一种核转录因子,可与cAMP反应元件结合,调节基因转录,具有调节精子生成,昼夜节律,学习记忆等功能.近年来关于其在学习记忆中的作用成为医学研究热点.CREB是神经元内多条信息传递途径的汇聚点,参与长时记忆形成和突触可塑性.长时记忆(long-term memory)形成需依赖CREB介导的基因转录,干扰或抑制CREB活性可破坏长时记忆.长时程增强(long-term potentiation,LTP)是研究学习记忆的理想模型,在LTP诱导和维持过程中均可观察到CREB活性持续升高.但增龄过程中,海马CREB活性下降,影响学习记忆功能,与许多神经退行性疾病发生有关. 相似文献
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Michele Rivkin-Flsh 《Medical anthropology quarterly》2000,14(1):119-120
Pragmatic Women and Body Politics. Margaret Lock and Patricia A. Kaufert. eds. Cambridge, UK: Cambridge University Press, 1998. xii +364 pp.
Maternities and Modernities: Colonial and Postcolonial Experiences in Asia and the Pacific. Kalpana Ram and Margaret Jolly. eds. Cambridge, UK: Cambridge University Press, 1998. xiv. 305 pp. 相似文献
Maternities and Modernities: Colonial and Postcolonial Experiences in Asia and the Pacific. Kalpana Ram and Margaret Jolly. eds. Cambridge, UK: Cambridge University Press, 1998. xiv. 305 pp. 相似文献
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