Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 82 for “"EPR spectroscopy"”.
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COMPUTER APPLICATIONS IN QUANTITATIVE EPR SPECTROSCOPY OF METALLOPROTEINS (FERRITIN, APOFERRITIN, IRON)
… examines the use of computers in quantitative EPR spectroscopy. The computers used ranged from hand held calculators to large main frame systems. Applications discussed are protein assay calculations, an EPR minicomputer interface and software system and the modification of an existing EPR …
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Triplex formation as monitored by EPR spectroscopy and molecular dynamics studies of spin -probe -labeled DNAs
… spin-probes the electron paramagnetic resonance (EPR) study of spin-labeled macromolecules has been able to provide insight into structural and dynamics properties of DNAs, proteins, and related systems. Spin labels have been extensively used to study the dynamics of oligonucleotides. An example …
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An investigation into Manganese(2+) interferences and retrospective dose assessment of shelled species using EPR spectroscopy
… retrospective electron paramagnetic resonance (EPR) studies. This thesis investigates the factors causing Mn²⁺ accumulation in shells including crystalline structure and animal habitat. Inductively coupled plasma - optical emission spectroscopy (ICP-OES) was used to determine the Mn²⁺ …
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Metal dependent structure, dynamics, and function in RNA measured by site-directed spin labeling and EPR spectroscopy
… using site-directed spin labeling (SDSL) and EPR spectroscopy, distances in RNA duplexes, TAR RNA, and the hammerhead ribozyme have been measured to investigate RNA structures. Kinetic measurements have been performed in the extended hammerhead ribozyme to correlate the catalytic function with …
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Conformational changes in actinin-type actin binding domains: probing actin-induced structural dynamics in dystrophin and utrophin using EPR spectroscopy.
… models. Electron paramagnetic resonance (EPR) spectroscopy, especially double electron-electron resonance (DEER), can be used to distinguish between these models or to build new models. In this thesis, I present data from DEER experiments which suggest that actinin-type ABDs of dystrophin …
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A device for testing the electronic and mechanical properties of conducting polymers with electron paramagnetic resonance spectroscopy
… properties of conducting polymers with EPR Spectroscopy. The performance of the testing device was explored with a controlled experiment. The results of this experiment suggest that the response of conducting polymer actuators to mechanical inputs can be examined with EPR Spectroscopy.
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Thermodynamic and Spectroscopic Studies of Some Metal Dimers
… were studied using a combination of calorimetry, epr spectroscopy, and uv-visible absorption spectroscopy.
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Spin Chemistry of Guest@Host Systems: H₂@C₆₀ and Nitroxide@Octa Acid
… (NMR) and electron paramagnetic resonance (EPR) spectroscopy. The first chapter describes the background and motivation of our scientific pursuit. Chapters 2-4 describe the nuclear spin chemistry of the two allotropes of elemental hydrogen, para-H₂ and ortho-H₂, incarcerated in C₆₀, open-C₆₀ …
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Picosecond studies of free radical reactions in solution
… were examined. Electron paramagnetic resonance (EPR) spectroscopy shows that these carbenes are ground-state triplets. These carbenes react with methanol to form 9-methoxy ethers. The absence of a heavy atom effect in this reaction suggests that intersystem crossing is not involved in the …
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A study of SecA : the motor of the bacterial secretion system by site-directed spin labeling and EPR
… issues using electron paramagnetic resonance (EPR) spectroscopy and site-directed spin labels at a multitude of sites on the surface of the 102 kDa SecA protein. EPR spectroscopy is sensitive to changes in the local environment of the spin label, and thus our survey of the SecA surface provided …
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High-frequency time domain electron paramagnetic resonance : methods and applications
… (high field) electron paramagnetic resonance (EPR) spectroscopy. Two of the most important are improved sensitivity and the improved resolution of field dependent interactions. In addition, there are many attractive features to time domain spectroscopy. Pulsed EPR allows for the design of …
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Purification and Characterization of the Cytochrome BC(1) Complex From Rhodobacter Sphaeroides
… center were monitored by low-temperature EPR spectroscopy, and its midpoint potential was shifted from +280 to +315 mV upon addition of inhibitor. The redox properties of the antimycin-sensitive ubiquinone species were also studied by EPR spectroscopy, and a pH dependence of $-$53 mV/pH …
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Novel supramolecular assemblies based on sulfur-nitrogen radicals.
… several compounds have been investigated using EPR spectroscopy and magnetic susceptibility studies. Chapter one begins with an overview of the chemistry of 1,2,3,5-dithiadiazolyl radicals. A general discussion of the history of organic conductors and magnets, and the terms involved in some of …
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Detection and analysis of spin trapped radical adducts using thermal desorption gas chromatography mass spectrometry (TD-GC-MS)
… techniques like Electron ParamagneticResonance (EPR) spectroscopy or Mass Spectrometry (MS). In the current study, Fenton chemistry has been used to generate hydroxyl radicals. Sincethe hydroxyl radical adduct of the spin-trap N-tert-butyl-α-phenylnitrone (PBN) is shortlivedat room temperature a …
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Synthesis and Optical Studies of Organoboron Compounds
… the BICT state by performing transientabsorption spectroscopy on four-coordinate borafluorenes which have improved optical stability.A family of four-coordinate borafluorenes was synthesized, each containing a dative B-O bondand two tert-butyl moieties on the aryl ring. Transient absorption …
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Investigating Ligand Induced Conformational Changes in the Estrogen Receptor
… along with electron paramagnetic resonance (EPR) spectroscopy. In this work, B and C parameter calculations from EPR line-shape theory express receptor differences quantitatively as a spectrum of conformational change. Relative squared difference (RSD) analysis allows us to compare ligand …
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Chemical probes for the study of mitochondrial oxidative stress
… which gives a simple, persistent, quantifiable EPR (electron paramagnetic resonance) signal. Phosphonium salt i was prepared and EPR spectroscopy studies in a trial oxidation reaction indicated the formation of the late stage nitroxide precursor ii. Three new pyridinium salt nitrone spin traps …
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Magnetic resonance of cobalt(II) and iron(III): A Schiff's base and heme proteins
… were determined by EPR spectroscopy. The three rotation axes for the three single crystals were not exactly perpendicular to each other, but their exact orientations were known by X-ray diffraction analysis. The program IMOFT, developed for this study, was used to …
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Synthesis of 1-chloro-1,2,4,6-selenatriazines and some products of reduction
… was identified by 1HNMR, Mass spectroscopy and X-ray crystallography. 1-Chloro-1,2,4,6-selenatriazines were synthesized in high yield and fully characterized. Five 1-chloro-1,2,4,6-selenatriazine crystal structures were obtained. Reduction of 1-chloro-1,2,4,6-selenatriazines …
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