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text Clarkson, Robert B. Oluoch, Antony Onyango 2015-09-28T15:38:21Z 2015-09-28T15:38:21Z 10000-01-01 2001 2001 Using an amperometric technique (The ISO-NO meter), it was established that in aqueous solutions the rate law for auto-oxidation of NO is second order with respect to the concentration of NO, with a third order rate constant. Using a combination of electron paramagnetic resonance (EPR) techniques and fusinite, it was shown that in the ascorbate/nitrite NO generating system, the rate limiting steps are dependent on the reductant (ascorbate) and oxidant (nitrite) concentrations, and on the pH of the reaction mixture. It was established that Fe-MGD (a complex of N-methyl-D-glucamine dithiocarbarmate (MGD) and reduced iron (Fe2+)) was an efficient trap for NO in EPR. Using Fe-MGD, the reduction of metronidazole in various systems was examined. When metronidazole was incubated for one hour at 37°C with (1) sodium dithionite and (2) the enzymatic mixture consisting of ferredoxin oxidoreductase, ferredoxin, and NADPH, NO was only detected by EPR following the addition of ascorbic acid. On the other hand, the nitro anion radical was consistently produced at concentrations of >40 muM when 50 mM metronidazole was incubated with 109 Trichomonas vaginalis for one hour at 37°C regardless of whether ascorbic acid was added to the system or not. Further, in all three reduction systems, nitrite ions were separately detected using the Griess reagent. In the Lactate dehydrogenase assay, there was a positive correlation between the concentration of metronidazole, NO and the toxicity to Trichomonas vaginalis. On electron microscopy (EM), metronidazole, as well as NO, caused variable cytopathic changes to the trichomonads. On the other hand, nitrite alone at concentrations tested (20 mM) was not toxic to Trichomonas vaginalis in both the LDH assay and EM. Made available in DSpace on 2015-09-28T15:38:21Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3017175.pdf: 7526775 bytes, checksum: d97911e14f647c5c36f46dfbb3fb7620 (MD5) Previous issue date: 2001 Embargo set by: Seth Robbins for item 88390 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 175 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001. http://hdl.handle.net/2142/87109 (MiAaPQ)AAI3017175 eng Biology, Microbiology Nitric Oxide in the Cytotoxicity of Metronidazole Against Trichomonas Vaginalis Veterinary Clinical Medicine Veterinary Clinical Medicine University of Illinois at Urbana-Champaign Dissertation Ph.D.