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Taubenberger et al. claim that the 1918 influenza virus was derived from an avian source and adapted to humans shortly before the pandemic. However, we do not believe that this conclusion, which has been widely disseminated in the popular press and in scientific journals, is supported by their phylogenetic evidence. 相似文献
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Taubenberger et al. have sequenced the polymerase genes of the pandemic 'Spanish' influenza A virus of 1918, thereby completing the decoding of the genome of this virus. The authors conclude from these sequences that the virus jumped from birds to humans shortly before the start of the pandemic and that it was not derived from earlier viruses by gene shuffling, a process called reassortment. However, we believe that their evidence does not convincingly support these conclusions and that some of their results even indicate that, on the contrary, the virus evolved in mammals before the pandemic began and that it was a reassortant. In light of this alternative interpretation, we suggest that the current intense surveillance of influenza viruses should be broadened to include mammalian sources. 相似文献
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《曲靖师范学院学报》2012,(3)
关于结婚这件事,反反复复、断断续续中似乎也考虑了很久,这个我在北京认识的第一个人,谈的第一场也中一谈就将近六年的恋爱,提及婚嫁似乎是顺其自然、顺理成章的事情.在北京这个陌生噪杂的大都市里,我们一起走过了青葱岁月,一起成长,一起经历了风风雨雨. 相似文献
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几百年前杜市的商人就已实现了区域化经营,现代流行的"加工区"、"特区"、"销售网络"等理念或做法都可或多或少地从当时杜市的商人那儿找到一些原始的雏形。 相似文献
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《科技信息》2000,(10)
李伯涛,1967年毕业于北京农业大学,曾历任技术员、科长、车间主任、厂党委副书记、副厂长,81年4月至今任厂长兼党委书记。他励精图治,锐意改革,使齐鲁制药厂从一个年产值仅200万元、利税30万元的小厂发展成年产值达10亿元、利税6000万元、固定资产6亿元的现代化大型综合性制药企业。他多次被记功受奖,数次被评为省优秀党员、省技尖人才,95年被授予“全国劳动模范”的光荣称号,从1992年起享受国务院工程技术事业特殊津贴。主要成绩有以下几个方面: 一、开发新产品,调整产品结构:科技是企业发展的源泉和动力,只有加快新产品开发,企业才能有出路,李伯涛同志在上任之初即敏锐地意识到这一点。十几年来他亲自组织、主持或参与了三十多个国家级 相似文献
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