Index Catalog // ScholarsArchive@OSU

Mass spectrometric studies on peptides and proteins : conformations of Escherichia coli Thioredoxin and its alkylated adducts studied by hydrogen/deuterium exchange and HPLC-electrospray ionization mass spectrometry

Creator:: Kim, Moo-young
Abstract:: E. coli thioredoxin (TRX) was modified by the episulfonium ion derived from S-(2-chloroethyl)glutathione (CEG) or S-(2-chloroethyl)cysteine (CEC). The alkylation site was located at Cys-32, which was confirmed by tandem mass spectrometry. Two forms of native TRX, Oxi- and Red-TRX, and two modified TRXs, GS- and Cys-TRX, were examined by hydrogen/deuterium...
Resource Type:: Dissertation

Mass spectrometric analysis of proteins and peptides : elucidation of the folding pathways of recombinant human macrophage colony stimulating factor beta

Creator:: Zhang, Yuan Heidi
Abstract:: Recombinant human macrophage colony stimulating factor beta (rhm-CSFβ) is a glycoprotein that stimulates the proliferation, differentiation and survival of cells belonging to the monocyte-macrophage lineage. It contains nine inter-subunit and intra-subunit disulfide bonds and represents an excellent model system for studying disulfide bond formation during protein folding because the assembly...
Resource Type:: Dissertation

Photochemistry of molecules oriented with a uniform electric field

Creator:: Castle, Karen J.
Resource Type:: Dissertation

Delocalization in cationic, carbene, and radical intermediates in some bridged polycyclic systems

Creator:: Dacres, Jelena Estelle
Resource Type:: Dissertation

Electroluminescent and photoluminescent phosphor development and a facile approach to synthesis of refractory silicates at low temperatures

Creator:: Clark, Benjamin L.
Resource Type:: Dissertation

Novel monolithic columns for microscale liquid chromatography and capillary electrochromatography

Creator:: Chirica, Gabriela S.
Abstract:: The challenges prompted by miniaturization of chromatographic systems have led scientists to explore new avenues in the synthesis of stationary phases. Packed capillary columns have found limited application in routine analysis due to a number of technical difficulties, most of which are attributable to the frits. New column designs insure...
Resource Type:: Dissertation

Negative thermal expansion in AOMO₄ compounds

Creator:: Amos, Tammy G.
Resource Type:: Dissertation

The role of iron-oxides in U(VI) adsorption and the kinetics of contaminant organic reduction

Creator:: Logue, Brian A.
Abstract:: Contaminant transport in ground water is an important environmental process that affects a host of natural systems. Transport of contaminants is affected by many processes, including aqueous complexation, adsorption, and redox reactions. One of the most important components of an aquifer that controls transport is iron-oxide. In this study, the...
Resource Type:: Dissertation

Threshold ionization spectroscopy of metal clusters and metal-ligand complexes

Creator:: Peng, Xianzhao
Abstract:: In this dissertation, we describe a spectroscopic study of metal clusters and metal-ligand complexes using pulsed field ionization zero kinetic energy (PFI-ZEKE) photoelectron spectroscopy and mass analyzed threshold ionization (MATI) spectroscopy. Vibrational resolved spectra of sodium dimer, Na•NH₃, Na•(NH₃)₂ are presented. These spectra provide a direct measurement of the ionization...
Resource Type:: Dissertation

Intercalation, exfoliation, and nanocomposites of layered inorganic compounds

Creator:: Sukpirom, Nipaka
Abstract:: The melt intercalation of poly(ethylene oxide) (PEO) between layers of MoO₃ and MPS3 (M=Mn,Cd) is obtained by heating the ground mixture and LiₓMoO₃, KₓMn₁-ₓ/₂PS₃, or KCd₁-ₓ/₂PS₃. The products are characterized by powder X-ray diffraction (XRD). Below the melting temperature of PEO (66 °C), intercalation rates and yields are low. By...
Resource Type:: Dissertation

Advanced studies on the biosynthesis of the streptolidine moiety of streptothricin F

Creator:: Jackson, Michael D.
Resource Type:: Dissertation

Natural product synthesis via cyclobutanes : part I, Asymmetric synthesis of (+)-byssochlamic acid, part II, An approach to the nootropic agent huperzine A

Creator:: Kim, Jungchul
Abstract:: PART I. Asymmetric syntheses of both natural (+)- and nonnatural (-)-byssochlamic acid via a [2+2] photoaddition-cycloreversion strategy are described. X-ray crystallographic analysis of the cyclohexylamine salt 99 showed that the structure of the monomethyl ester 100 from esterase hydrolysis of 44 was originally misassigned as 56. The enantiomeric relationship of...
Resource Type:: Dissertation

Novel approaches to enhancing selectivity and efficiency in microscale liquid chromatography

Creator:: Vallano, Patrick T.
Abstract:: For a number of reasons, miniaturization of chromatographic columns has been a general trend over the past three decades. Methods designed to enhance selectivity and efficiency can offer improved separation power and speed, expanding on the advantages of miniaturized columns. This dissertation describes novel approaches in this direction, focusing on...
Resource Type:: Dissertation

Synthesis of marine natural products. part I, Cryptophycins-1, -3, -4, -24, and -29, part II, Polycavernoside A

Creator:: Robarge, Lonnie A.
Resource Type:: Dissertation

Mechanistic studies on Re(V) mediated C-O bond transformations

Creator:: Zhuravlev, Fedor
Abstract:: In situ, reduction of Cp*ReO₃ by PPh₃ to form (Cp*ReO)₂(μ-O)₂ allows catalytic deoxygenation of epoxides, however, conproportionation between Reⱽ and Reⱽᴵᴵ species to form clusters of ((Cp*Re)₃(μ-O)₆}²⁺(ReO₄⁻)2 and new compound {(Cp*Re)₃(μ²-O)₃(μ³-O⁾³ReO₃}⁺(ReO₄⁻) leads to removal of rhenium from the catalytic cycle and loss of activity, The epoxide deoxygenation mediated by (Cp*ReO)₂(μ-O)₂...
Resource Type:: Dissertation

Rhenium-catalyzed oxygen-atom transfer reactions : mechanism and applications

Creator:: Brown, Eric C.
Abstract:: In situ reduction of hydrido-tris-(3,5-dimethylpyrazolyl)borato(trioxo) rhenium(V) with triphenylphosphine or triethylphosphite leads to a reactive rhenium(V) species that catalytically deoxygenates epoxides at 75-105°C. The reaction is stereospecific, except for trans- and cis-butene oxide which formed minor amounts of the opposite isomer. A variety of different functional groups were tolerated and even...
Resource Type:: Dissertation

Theory of negative thermal expansion

Creator:: Tao, Ju Zhou
Abstract:: Two framework oxide materials of the MO₃ network type have been synthesized and structurally characterized by synchrotron and X-ray powder diffraction and the Rietveld method in the temperature range 25~500 K. The results show one of them to be a low thermal expansion material. Theoretical studies of negative thermal expansion...
Resource Type:: Dissertation

Development and evaluation of sampling techniques, instrumentation, and pyridine derivative reagents for fluorometric determination of chloroform and TCE in water with a portable fluorometer

Creator:: Prayoonpokarach, Sanchai
Abstract:: A novel, portable, filter fluorometer was developed for the determination of chloroform and TCE at environmentally-relevant levels when coupled with improved sampling techniques and reagents. Reagents selective for the TCE or chloroform convert these toxic species into fluorescent species that can be monitored. The fluorometer is based on LED excitation...
Resource Type:: Dissertation

Active site studies and design of ligands for affinity column separation of 2,5-dihydroxyacetanilide epoxidase (DHAE) I and II

Creator:: Allen, Scott E.
Abstract:: A series of compounds, 7-8 and 20-25, were tested as competitive inhibitors of 2,5-dihydroxyacetanilide epoxidase I (DHAE I) and DHAE II. A Hammett plot was constructed for each enzyme to determine the effect of electron density on inhibition. DHAE I gave a linear, highly correlated plot (r²=0.91) that signifies the...
Resource Type:: Dissertation

The development and characterization of miniature spectrometers for measuring the redox status of environmental samples

Creator:: Cantrell, Kevin
Abstract:: A spectrometer, here denoted a Simple, Low-power, Inexpensive. Microcontroller-based or SLIM spectrometer. was developed that exploits the small size and low cost of solid-state electronic devices. This approach results in customizable spectrometers that are considerably less expensive and smaller than traditional instrumentation. The performance of the SLIM spectrometer was evaluated...
Resource Type:: Dissertation

ScholarsArchive@OSU

Mass spectrometric studies on peptides and proteins : conformations of Escherichia coli Thioredoxin and its alkylated adducts studied by hydrogen/deuterium exchange and HPLC-electrospray ionization mass spectrometry

Mass spectrometric analysis of proteins and peptides : elucidation of the folding pathways of recombinant human macrophage colony stimulating factor beta

Photochemistry of molecules oriented with a uniform electric field

Delocalization in cationic, carbene, and radical intermediates in some bridged polycyclic systems

Electroluminescent and photoluminescent phosphor development and a facile approach to synthesis of refractory silicates at low temperatures

Novel monolithic columns for microscale liquid chromatography and capillary electrochromatography

Negative thermal expansion in AOMO₄ compounds

The role of iron-oxides in U(VI) adsorption and the kinetics of contaminant organic reduction

Threshold ionization spectroscopy of metal clusters and metal-ligand complexes

Intercalation, exfoliation, and nanocomposites of layered inorganic compounds

Advanced studies on the biosynthesis of the streptolidine moiety of streptothricin F

Natural product synthesis via cyclobutanes : part I, Asymmetric synthesis of (+)-byssochlamic acid, part II, An approach to the nootropic agent huperzine A

Novel approaches to enhancing selectivity and efficiency in microscale liquid chromatography

Synthesis of marine natural products. part I, Cryptophycins-1, -3, -4, -24, and -29, part II, Polycavernoside A

Mechanistic studies on Re(V) mediated C-O bond transformations

Rhenium-catalyzed oxygen-atom transfer reactions : mechanism and applications

Theory of negative thermal expansion

Development and evaluation of sampling techniques, instrumentation, and pyridine derivative reagents for fluorometric determination of chloroform and TCE in water with a portable fluorometer

Active site studies and design of ligands for affinity column separation of 2,5-dihydroxyacetanilide epoxidase (DHAE) I and II

The development and characterization of miniature spectrometers for measuring the redox status of environmental samples

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