Theses and Dissertations, Capstones, and Directed Research
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Electronic theses and dissertations, and graduate and undergraduate Capstones and Directed Research.
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Browsing Theses and Dissertations, Capstones, and Directed Research by Department "Chemistry and Biochemistry"
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Item A Partial Separation of the Constituents of Central Texas Cedar Leaf Oil(1942-08) Smith, Raymond A.; Key, Carroll L.; Smith, C.S.No abstract prepared.Item A Partial Separation of the Constituents of the Cracked Oil Obtained From Cedar Wood Tar(1949-08) Brehm, Hugo Adolph; Key, Carroll L.; Parks, Archie O.; Norwood, Patrick H.No abstract prepared.Item A Partial Separation of the Constituents of the Essential Oils of Cypress Wood (Taxodium Distichum)(1949-05) Barnard, Paul, Jr.; Key, Carroll L.; Roady, J.M.; Allen, EarlNo abstract prepared.Item A Quantitative Study of the Chemical Separations of the Fluoride Group of the Non-Sulfide Qualitative Analysis Scheme(1964-08) Carson, William Clyde; Parks, A.O.; Harlan, H.D.; Tulloch, Lynn H.No abstract prepared.Item A Study of the Physical and Chemical Properties of Cedar Leaf Oil(1940-08) Bennett, Robert L.; Burman, Harold G.; Wiley, E.O.; Rogers, J.L.No abstract prepared.Item A Study of the Physical Properties of a Fraction of Pyrolized Cedar Wood Oil Selected by Refractive Index(1950-01) Ashorn Riley D.; Kay, Carroll L.; Roady, J.M.; Cude, DonNo abstract prepared.Item A survey of dimeric mu-bridged compounds and determination of unit cell dimensions of several Pt-complexes(1971-05) Mayfield, John Charles; Cude, Willis A., Jr.; Fitch, John W., III; McEwen, Henry N.The objective of the problem was to survey recent literature for all mu-bridged compounds and to determine the unit cell dimensions of several platinum complexes. The literature survey was done using the subject indices of Chemical Abstracts for the last ten years. Each compound was recorded for future reference. A more detailed examination of the reported platinum complexes involved the structural determination and method of preparation of each compound. The experimental part of the problem employed an X-ray source and Weissenberg camera to obtain photographs of single crystals. From these photographs, data were taken and the unit cell dimensions calculated using an University of Arkansas program which was modified for the IBM 1130 computer at Southwest Texas State University.Item A Survey of Generally Recognized as Safe (GRAS) Chemical Modifications for Montmorillonite Clay(2005-05) Bartels, Jeremy W.; Beall, Gary; Booth, Chad; Martin, BenA study was conducted investigating food safe intercalates for montmorillonite clay. The GRAS chemicals used in the study were chosen based on the presence of an oxygenated head group or other similar functionality, as well as compatibility with polymeric media. The synthesized organoclays were examined via X-ray diffraction to ascertain d-spacing. Subsequent organoclays with large gallery spacing were then subjected to thermogravimetric analysis and polymer compounding tests. Pentaerythritol stearate and glyceryl stearate organoclays performed well, with d-spacings approximately six times that of dry montmorillonite. Pentaerythritol stearate organoclays showed high thermal stability, approximately 88°C above that of modem quaternary ammonium organoclay Cloisite 20A. There is also evidence of high intercalation ability in poly(ethylene-co-vinyl acetate) (EVA) and Nylon-6 for the pentaerythritol stearate organoclays.Item Active Site Investigation and Affinity Purification of 2-(2'hydroxyphenyl)benzenesulfinate desulfinase(2002-05) Cody, Melissa Kay; Watkins, LinetteNo abstract prepared.Item Advanced Antireflective Coatings for Polycarbonate Substrates(2013-08) Simpson, Jeffrey R.; Booth, Chad J.; Patterson, Donald E.; Hudnall, Todd W.; Sun, LuyiOptical coatings are widely applicable to a variety of technologies. Inorganic materials are often used for these coatings. A common issue with inorganic coatings on polymer substrates is a mismatch in thermal expansion which can lead to cracking and failure of optical properties. Deposition of polymer coatings on polymer substrates is a potential solution to this problem. Mixed organic/inorganic antireflective coatings are deposited on polycarbonate ophthalmic flats using a combination of deposition methods: matrix assisted pulsed laser evaporation (MAPLE) and magnetron sputtering. The coatings are modeled to minimize reflectance and maximize transmission of visible spectrum light. MAPLE theory and system requirements are discussed in addition to optical modeling, coating materials and properties, matrix properties, and deposition parameters necessary for the production of optical quality coatings. Optical characterization and environmental durability testing results are presented.Item Alkylation of Zinc Thiolate Proteins: Reactions with Model Compounds(2003-08) Smith, Jennifer Nicole; Carrano, Carl J.Many metalloproteins are known to tetra hedrally coordinate a zinc atom into their folded conformation. The zinc is ligated to nitrogen, sulfur, and/or oxygen donor atoms, which come from amino acid residues, such as histidine, cysteine, tyrosine, aspartic acid, and glutamic acid. The operative roles of the proteins are classified as either for structural support, or for enzymatic activity. The reactive proteins can utilize the same tetrahedral coordination to the same donor atoms as the nonenzymatic proteins. To date, it is unclear how nature is controlling the reactivity of zinc thiolate proteins. Learning how to control the reactivity of zinc-thiolate bonds can have major implications in the development of new pharmaceuticals, in addition to fundamental protein chemistry. The research presented here involves the synthesis and characterization of small molecule chemical models, which mimic the active sites of zinc-thiolate proteins. The zinc complexes studied are of the general type, LZn-SR, where L represents a tripodal heteroscorpionate ligand, and SR represents a thiophenol. 'H NMR kinetic studies were performed to determine the influence of the ligand donor atoms and of the hydrogen bonding interactions during the alkylation of a variety of model compounds. The reactions were run in chloroform, acetonitrile, and methanol with either of two methylating agents, methyl iodide or trimethyloxonium tetrafluoroborate. The comparison of rate constants firstly shows that hydrogen bonding to the sulfur donor decreases the rate of alkylation, and secondly that the strength of the hydrogen bond only mildly influences the rate. In addition to controlling zinc thiolate reactivity, it is shown that hydrogen bonding also generates exquisite specificity when multiple thiolate targets are present. Finally, the data also support the proposal that a zinc-bound thiolate is the actual nucleophile in the alkylation mechanism.Item Alkylations of 1,2-alternate Calix[4]arene(2002-12) Rodriguez, Abelardo H.A 1,2-altemate calix[4]arene conformer (25,26-dibenzoyloxy-27,28-dihydroxy calix[4]arene) was synthesized from the more common 1,3-dibenzoyloxy flattened cone conformer. The 1,2-altemate conformer was exhaustively alkylated with methyl, ethyl, and «-propyl tosylate. The 1,2-altemate conformation was conserved during méthylation while in the ethylation and propylation, the products were a 1,3-altemate 1,3-diester and a partial cone 1,3-diester. The 1,2 alternate calix[4]arene was also alkylated in a stepwise fashion to find the pathway for the exhaustive alkylation process. Methyl and «-propyl tosylate were used as the alkylating agents in the first alkylation of the 1,2-altemate conformer. The 1,2-altemate diester stereochemistry was retained with the methyl tosylate, however, in the case of the «-propyl tosylate, the reaction yielded 1,2-dibenzoyloxy calix[4]arene in cone and partial cone conformations. The second méthylation stayed in the 1,2-altemate 1,2-diester orientation, as in the exhaustive alkylation. Likewise, the second propylation yielded the same 1,3-altemate diester and 1,3-diester partial cone conformations as did in the exhaustive alkylations. It was determined that size of the electrophile determines whether migration of the ester will happen. In the case of the methyl tosylate, no migration occurred, where as in the case of the ethyl and «-propyl tosylate, migration did occur. However, in the alkylation of ethyl and propyl, the 1,2-diester orientation was preserved after the first alkylation, but during the second alkylation, there was a migration of the 1,2-diester to the 1,3-diester.Item An Investigation of Solvent Effects on the Saponification Rates of Aliphatic Esters(1965-05) Mastrovich, John D.No abstract prepared.Item An Investigation of Some Chemical Products of Central Texas Cedar(1938-06) Black, Howard; Key, Carroll L.; Hopson, Herschel; Votaw, David F.No abstract preparedItem An Investigation of the 254.0-254.9 Degree Centigrade Fraction of New Braunfels Cedar Wood Oil(1948-08) Couser, William F.No abstract prepared.Item An Investigation of the Effect of Rate of Solvent Flow on the Rf Values of Amino Acids(1961-08) Clark, Donald E.; Willms, C.R.; Parks, A.O.; Norris, W.E.No abstract prepared.Item Analysis of Genes That Affect Telomere Stability in YKU70 Mutants and New Approaches for Separation of Yeast Nucleic Acids(2012-08) Malczewskyj, Eric Thomas; Lewis, L. Kevin; Booth, Rachell E.; Whitten, Steven T.No abstract prepared.Item Analysis of NHEJ DNA repair efficiency and accuracy in new mutants of Saccharomyces cerevisiae(2015-05) Lilley, Jennifer L.; Lewis, Kevin; Whitten, Steve; Booth, RachellNo abstract prepared.Item Anti-biofouling polymetric windows: Additive effects on mechanical and optical properties(2010-05) Wheeler, Phil E.; Booth, ChadThe objective of this study is to investigate the effects anti-biofouling additives have on the optical and mechanical properties in several transparent polymer systems. The resulting effects on mechanical and optical properties of incorporating these additives will be analyzed in a series of studies. The materials chosen for this study were polymethylmethacrylate (PMMA), bisphenol A polycarbonate (bis A-PC), and CBDO, a co-polyterephthalate derived from 2,2,4,4/-tetramethyl-l-3-cyclobutanediol and 1,3 propanediol. The anti-biofouling agents selected were all EPA, approved biocides. Irgarol ®1051 and Diuron were incorporated by melt compounding at the biocide manufacturers' recommended dosage. Subsequently, the compounded pellets were subjected to compression molding in order to produce the test plaques. Studies were conducted using TGA, DSC, and UV spectroscopy to evaluate mechanical and optical properties. The data show that PMMA/Irgarol ®1051 material displayed an increase in mechanical properties with increasing amounts of anti-fouling agent. Optical tests indicated that PMMA/Irgarol ®1051 had the highest retained percent optical transmission of all of the combinations of polymers and biocides tested.Item Application of a Novel Endonuclease Sensitivity Assay to Identify New Genes that Affect DNA Repair and Chromosome Stability(2008-05) Summers, Jennifer A.No abstract prepared.