![]() Our conclusion is that most of C3 and C4 in the ambient air comes from LP gas and not vehicle exhaust or evaporative emission, due to the higher levels of propane than butane in its formulation. The finding from analysis of the VOCs collected in the morning demonstrate that in the atmosphere, propane concentrations are higher than that of butane but the reverse in evaporative and exhaust emissions, with the concentration of propane lower than that of butane. The testing methodology used for measuring exhaust emission were FTP or EPA-74 tests, and SHED type tests were also conducted in order to evaluate evaporative emissions. These samples were collected in April 1995 during mornings and evenings. Samples of volatile organic compounds (VOCs) were collected in a smog chamber in order to determine whether automotive exhausts or LP Gas emissions play a greater role in the source of propane and butane, which affect ozone formation and other pollutants in the ambient air of the Mexico City metropolitan area (MCMA). Propane and butane emission sources to ambient air of Mexico City metropolitan area. ![]() Oxidative assimilation of n- butane is described. ![]() There seems to be little qualitative distinction in the glycerides of propane- or n- butane-grown cells. The other major component of the lipid fraction consists of triglycerides containing principally palmitic and stearic acids. The polymer in n- butane-grown cells apparently contains unsaturation in the molecule, and is identified tentatively as a co-polymer of β-hydroxybutyric and β-hydroxybutenoic (specifically 3-hydroxy 2-butenoic) acids. The polymer in propane-grown cells is poly-β-hydroxybutyrate. Lipid fractions of propane- and n- butane-grown nocardial cells each contain a chloroform-soluble, ether-insoluble polymer not observed previously in liquid n-alkane-grown cells. Cellular Lipids of a Nocardia Grown on Propane and n- Butane
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |