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Novel Enrichment Technique for Analysis of Low Level Chemicals

Novel Enrichment Technique for Analysis of Low Level Chemica...

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中国化学会第27届学术年会

作者：杨翠 Key Laboratory of Nature Resource of the Changbai Mountain and Functional Molecular （Yanbian University） Ministry of Education

＜正＞Sample pretreatment before chromatographic analysis is the most time consuming and error prone part in the analytical procedure and it is a key factor in the final success of the analysis. The headspace liquid

关键词： vapor pressure Gas flow Headspace extraction Liquid phase micro-extraction Volatile and semivolatile organic compounds

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Independent and interactive effects of ambient temperature and absolute humidity on the risks of avian influenza A(H7N9) infection in China

Independent and interactive effects of ambient temperature a...

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2017新发传染病研究热点研讨会

作者： Tao Liu Min Kang Bing Zhang Guangdong Provincial Institute of Public Health Guangdong Provincial Center for Disease Control and Prevention

The emergence of avian influenza A(H7N9) virus poses a pandemic threat to human beings. It was proposed that meteorological factors might be important environmental factors favoring the occurrence of H7N9 infection, but evidence is still inadequate. In this study, we aimed to investigate the independent and interactive effects of ambient temperature(TM) and absolute humidity(AH) on H7N9 infection risks in China. The individual information of all reported H7N9 cases and daily meteorological data in five provinces/municipality(Zhejiang, Jiangsu, Shanghai, Fujian, and Guangdong) in China during 2013-2016 were collected. We employed a case-crossover study design, in which the 7-10 days before the onset date of each H7N9 case was defined as the hazard period, and 4 weeks before the hazard period was taken as the control period. The average levels of meteorological factors were calculated during the hazard and control periods. A Cox regression model was used to estimate the independent and interactive effects of TM and vapor pressure(VP), an indicator of AH, on H7N9 infection risks. A total of 738 H7N9 cases were included in the present study. Significantly nonlinear negative associations of TM and VP with H7N9 infection risks were observed in all cases, and in cases from northern and southern regions. There were significant interactive effects between TM and VP on H7N9 infection risks, and the risks of H7N9 infection were higher in cold-dry days than other days. We further observed different risky windows of H7N9 infection in the northern(TM: 0-18°C, VP: 3-13 mb) and southern areas(TM: 7-21°C, VP: 3-17 mb). We concluded that ambient temperature and absolute humidity had significant independent and interactive effects on H7N9 infection risks in China, and the risks of H7N9 infection were higher in cold-dry days. The risky windows of H7N9 infection were different in the northern and southern areas.

关键词： Avian influenza H7N9 Temperature Absolute humidity vapor pressure Case-crossover

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