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Variability Of No And No2 Above The Snowpack At Summit, Greenland, Zhixin Wang
Variability Of No And No2 Above The Snowpack At Summit, Greenland, Zhixin Wang
Dissertations, Master's Theses and Master's Reports - Open
Nitric oxide (NO) and nitrogen dioxide (NO2) were measured at levels of approximately 7.5 m, 3 m, and 0.5 m above the surface snowpack at Summit, Greenland from July 2008 to July 2010, respectively, with two sets of instrument systems. Instrument I measured NO and NO2 at levels of 3 m and 0.5 m with two inlets, and instrument II measured NO and NO2 at a level of 7.5 m plus total reactive nitrogen oxides (NOy) at the same level with one inlet. Compared to previous measurements, the data provided the first year-round simultaneous …
Acetyl Radical In Tobacco Smoke: Detection, Quantification And Simulation, Na Hu
Acetyl Radical In Tobacco Smoke: Detection, Quantification And Simulation, Na Hu
Dissertations, Master's Theses and Master's Reports - Open
Free radicals are present in cigarette smoke and can have a negative effect on human health by attacking lipids, nucleic acids, proteins and other biologically important species. However, because of the complexity of the tobacco smoke system and the dynamic nature of radicals, little is known about the identity of the radicals, and debate continues on the mechanisms by which those radicals are produced. In this study, acetyl radicals were trapped from the gas phase using 3-amino-2, 2, 5, 5- tetramethyl-proxyl (3AP) on solid support to form stable 3AP adducts for later analysis by high performance liquid chromatography (HPLC), mass …