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Development Of Ozone Forecast Models For Selected Kentucky Metropolitan Areas., Yiqiu Lin 1971-
Development Of Ozone Forecast Models For Selected Kentucky Metropolitan Areas., Yiqiu Lin 1971-
Electronic Theses and Dissertations
Ground-level ozone forecast models were developed for the following middle and small metropolitan areas in Kentucky: Ashland, Bowling Green, Owensboro, and Paducah. These models were nonlinear regression models, based on models previously developed for Louisville and Lexington. For each of the four cities, the mean absolute errors (MAE) for the model estimates, based on the 1998-2002 model-fitted data sets, were less than 7.7 ppb; the MAE/O3 were less than 12.7%. The models could explain at least 66% of the variance of the daily peak ozone. On average, the errors of the model were within +/- 15.0 ppb on 88% of …
Dhea Action Is Mediated By Multiple Receptors And Metabolites., Kristy K. Michael Miller
Dhea Action Is Mediated By Multiple Receptors And Metabolites., Kristy K. Michael Miller
Electronic Theses and Dissertations
Dehydroepiandrosterone (DHEA) is a C-19 adrenal steroid and the most abundant circulating hormone in humans. Since circulating levels decline in late adulthood, treatment of humans with DHEA has been suggested to have beneficial health effects. Although the mechanism of action is unknown, DHEA may be metabolized to active metabolites that exert their physiological effects by receptor-mediated processes and cell signaling pathways. The purpose of this study was to investigate the mechanistic processes of DHEA action. Since DHEA may exert its pleotropic effects by being metabolized to biologically active species, a GC/MS method was developed to quantify the liver microsomal metabolism …
Isomerization, Reactivity, And Structural Study Of A Thioperoxide-Bridged Dimolybdenum(V) Dimer., Chi Minh Tuong 1971-
Isomerization, Reactivity, And Structural Study Of A Thioperoxide-Bridged Dimolybdenum(V) Dimer., Chi Minh Tuong 1971-
Electronic Theses and Dissertations
The synthesis of the methyl thioperoxide-bridged dimolybdenum(V) dimer, [Mo2(NTo)2(S2P(OEt)2)2S(O2CMe)(SOMe)], was improved and the compound was structurally characterized by crystallography. The compound proved to be very stable to light and heat. The possibility of photolytic or thermolytic rearrangement of the methyl thioperoxide ligand ( -S-O-R) to a methyl sulfinyl ligand ( -S(=O)R) was investigated. These studies showed that the methyl thioperoxide compound did not produce the desired sulfinyl isomer. The photolyses produced mainly a derivative of the methyl thioperoxide compound, where a hydroxo bridge is thought to have replaced the acetate bridge. Minor products formed in general agreement with the photolysis …