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在一篇科技论文中,题目和摘要占有重要的地位.因为它们是论文中言简意赅地表达主题和主要内容的部分.不少读者是在阅读了它们之后才决定是否要阅读全文的.再者,大多数题目和摘要是要脱离全文而出现在文摘刊物或存贮在科技情报机构的计算机检索数据库中的,故它们被读者阅读的几率大于全文.因此写得不好的题目和摘要很可能使论文丧失一些读者,这对扩大论文的影响是不利的.目前我国英文科技刊物的数量日渐增多,不少中文科技刊物也有英文题目和摘要.为了有利于国际学术交流,我们应认真对待写好论文的英文题目和摘要这一问题. 在目前的一些专著中… 相似文献
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《光谱学与光谱分析》1986,(1)
当用相应于Yb~(3+)吸收线波长(λ=9800(?))的红外激光去激发YbF_3(含0.2ppm的Tm~(3+)杂质)时,也可以观察λ=4780(?)与λ=6450 (?)的上转换荧光。它们可分别归属为Tm~(3+)离子~1G_4→~3H_6与~1G_4→~3H_4的跃迁。这是到目前为止所发现的最灵敏的上转换荧光。这可以成为一种检测痕量稀土杂质的方法。 相似文献
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Structural genomics and proteomics were born from the understanding that functions of a protein are dictated by its 3D structure and dynamics. To understand protein functions on a genomic scale, we must know protein structures on a genomic scale. High resolution NMR can be used for this purpose. Traditional multidimensional NMR structure determination protocols become ineffective for structural genomics since to obtain a structure of a small protein of 15kD requires many months of painstaking spectral analysis and modeling. Recent advances in magnet and probe technology and in experimental methods have expanded the range of proteins amenable to structure determination and make the large scale structure determination possible. These advances are (1) effective expression systems for protein production, (2) introduction of cryoprobe, (3) structure determination with the use of the minimal amount of structural restraints obtained from the chemical shifts, residual dipolar couplings, NOEs, and computer modeling. In this talk,Iwill briefly outline these developments and related works done in our NMR lab. 相似文献
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