共查询到19条相似文献,搜索用时 78 毫秒
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本文是《分析试验室》定期评述中“化工、石油产品及硅酸盐分析”课题的第六次评述,它评述了1995年7月至1997年6月国内关于化工产品、石油产品、硅酸盐的分析进展情况,共引用文献675篇。 相似文献
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本文是《分析试验室》定期评述中“化工、石油产品及硅酸盐分析”课题的第七次评述,评述了1997 年7 月至1999 年6 月国内关于化工产品、石油产品、硅酸盐的分析进展,引用文献709 篇。 相似文献
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Using model peptides ranging from tri- to dodecapeptides, the utility of several new N-protecting groups, i.e., 3-hydroxyalkanoyl and δ2-acyl groups including Oct(OH), Dec(OH), Dod(OH), Myr(OH), Pal(OH), Ste(OH), Δ2-Dec, Cro, and Cin, for mass spectrometric sequence analysis were examined. Among these, the Dec(OH)- and Δ2-Dec peptide derivatives were found to be superior to the hitherto reported Ac or Dee derivatives, since they gave comparable or sometimes better mass spectra. Particularly the Dec(OH) derivatives yielded two series of sequence peaks (as doublets of 18 mass units apart) ascribable to partial dehydration of the protecting group, the fact which makes the recognition of sequence determining peaks much easier. The Cro and Cin derivatives also gave mass spectra comparable to those of the corresponding Ac or Dec ones, except in a few cases where (Pro-Pro-Gly)2–4 were model peptides. Permethylation technique can also be effectively applied to the all new acyl derivatives for the mass spectrometric sequence studies. 相似文献
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Carl Arnold 《Fresenius' Journal of Analytical Chemistry》1881,20(1):231-233
Ohne ZusammenfassungHannover, chem. Laborator. der Thierarzneischule, 14. Dec. 1880. 相似文献
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Ohne ZusammenfassungNew Haven, Conn., 24. Dec. 1892.Von den Verfassern in englischer Sprache mitgetheilt. 相似文献
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陈克家 《广东微量元素科学》1999,6(1):68-69
对53例腰椎滑脱症的患者施行了五种不同手术方式,分别为椎板减压后单纯脊柱植骨融合术、Luque’s棒内固定加植骨融合术、椎体复位、Dick’s钉、Steffee钢板或RF内固定加植骨融合术。术后随访6月 ̄3年。对比分析各术式手术前后的临床症状改善程度、患椎的平均滑脱距离和平均活动度。五种术式的优良率依次为71.5%、77.8%、81.8%、84.6%、83.2%。Steffee钢板结构简单,易操作 相似文献