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研究了 2 0 0 0年 MCM— B题 ,将问题推广到有三层干扰的复杂情况 ,给出并严格证明了 ( k,1,1)问题的最优解 相似文献
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本文用毛细管气相色谱法绘制了36株莫拉氏菌(Moraxella)及其类属菌和13株嗜肺军团杆菌(Legionella pneumophila)全细胞脂肪酸气相色谱图,用气相色谱-质谱法解析了某些色谱峰,借助电子计算机对脂肪酸色谱图进行聚类分析。结果表明,我国分离的莫拉氏菌新种(M.amylolytica和M.nanchang)和目前该菌主要标准菌株均不相同,脂肪酸成分以异十五烷酸为主。我国新分离的嗜肺军团菌N J8331和LDB 4a的脂肪酸色谱图和国际标准株基本一致,主要成分为异十六烷酸,而另一株LDB 4b和Legionella pneumophila 1-8型差别很大。以上结果和传统分类鉴定结果一致,由此看到化学分类法在微生物分类鉴定和生物学研究中的重要性。 相似文献
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Whole-cell fatty acid profiles of 36 strains of Moraxella and its related bacteria, and 13 strainsof Legionella pneumophila were obtained by capillary gas chromatography (GC). Some component peaksin these profiles were analyzed by gas chromatography-mass spectrometry (GC-MS). Hierarchical clus-tering analysis of these bacterial fatty acid patterns was done with a microcomputer. Results showedthat these were some obvious differences between the two new species of Moraxella isolated in China,i.e. M. amylolytica and M. nanchang, and the currently established reference strains of this genus. Themajor fatty acids of these two new species were the isomers of pentadecanoic (C_(15:0)) acids. Theprofiles of L. pneumophila NJ 8331 and LDB 4_a recently isolated in China were essentially similar tothose of international reference strains type 1-8 (CDC, USA), which contained mainly 16-carbon (C_(16))acids, whereas another isolate LDB 4b was obviously dissimilar. The results of this method of discrim-ination and of t 相似文献
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