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生存教育:素质教育的重要内容 总被引:6,自引:0,他引:6
“生存教育”是以培养和训练学生生存能力为主要目的的教育。形势发展的需要和现实的差距,要求我们必须把生存教育当作素质教育的重要任务和内容来抓。生存教育要使学生学会在“独自”情况下生存,学会在压力下生存,学会在紧急状况下生存,学会在集体中生存,学会在逆境中生存。应从多个方面、多种途径实施生存教育。 相似文献
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克隆可谓是当今最时髦、然而也是最危险的词汇。自从1996年英国科学家用成年绵羊体细胞成功克隆出“多莉羊”以来,“克隆牛”、“克隆猪”陆续出现,尽管这些克隆出来的生命体不是在胚胎发育过程中夭折就是刚出生不久便死去,但它们仍然使全世界震惊。客观地说,克隆这一生物工程技术在动物养殖业中有应用前景, 尽管这种前景十分遥远。利用体细胞核克隆动物将大量繁殖优秀的动物个体,而不用担心优秀个体的遗传物质在繁育过程中被其他个体的遗传物质混杂。此外,现在人们能够对染色体上的基因进行定位, 能够用类似外科手术的方法将染色体中的有害… 相似文献
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赵妍茹 《中国新技术新产品精选》2009,(7):218-218
素质教育最根本的要求是让学生在德、智、体、美、劳等方面全面发展。新中国成立以来,党和政府历来都高度重视教育,特别强调要全面提高学生综合素质。素质教育分三个方面:生存能力教育、做人道理教育及社会发展的基本知识的教育。实施素质教育需要切实做到个性化教育,让每个孩子有更多的自主空间,根据自己的需求发展。更为根本的是根据中考、高考这两根”指挥棒”,要降低考试难度,让学生有更充裕的时间去接触更多的东西。关于素质教育谈谈自己的看法。 相似文献
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Reconstruction of linkage maps in the distorted segregation populations of backcross, doubled haploid and recombinant inbred lines 总被引:1,自引:0,他引:1
ZHU ChengSong WANG FuHua WANG JianFei LI GuangJun ZHANG HongSheng ZHANG YuanMing 《科学通报(英文版)》2007,52(12):1648-1653
Non-Mendelian segregation of markers, known as distorted segregation, is a common biological phenomenon. Although segregation distortion affects the estimation of map distances and the results of quantitative trait loci (QTL) mapping, the effects of distorted markers are often ignored in the construction of linkage maps and in QTL mapping. Recently, we have developed a multipoint method via a Hidden Markov chain method to reconstruct linkage maps in an F2 population that corrects for bias of map distances between distorted markers. In this article, the method is extended to cover backcross, doubled haploid and recombinant inbred line (RIL) populations. The results from simulated experiments show that: (1) the degree that two linked segregation distortion loci (SDL) affect the estimation of map distances increases as SDL heritability and interval length between adjacent markers increase, whereas sample size has little effect on the bias; (2) two linked SDL result in the underesti- mation of linkage distances for most cases, overestimation for an additive model with opposite additive effects, and unbiased estimation for an epistatic model with negative additive-by-additive effects; (3) the proposed method can obtain the unbiased estimation of linkage distance. This new method was applied to a rice RIL population with severely distorted segregation to reconstruct the linkage maps, and a bootstrap method was used to obtain 95% confidence intervals of map distances. The results from real data analysis further demonstrate the utility of our method, which provides a foundation for the inheritance analysis of quantitative and viability traits. 相似文献
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本依据高科技武器装备的发展及其在作战中的运用,着重分析了高科技武器设备投放战场之后对军队战场观察能力、战场机动能力、战场打击能力、战场协同能力、战场野战生存能力所产生的影响。 相似文献
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