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 89 for “"electron paramagnetic resonance (EPR)"”.
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Rapid Scan Electron Paramagnetic Resonance (EPR) and Digital EPR Development
<p>Rapid scan electron paramagnetic resonance (EPR) was developed in the Eaton laboratory at the University of Denver. Applications of rapid scan to wider spectra, such as for immobilized nitroxides, spin-labeled proteins, irradiated tooth and fingernail samples were demonstrated in this …
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Development of EPR Methods for Simultaneous Measurements of Intra- and Extra-Cellular Oxygen Concentration in Vitro
In this thesis, the electron paramagnetic resonance (EPR) methods for simultaneous measurement of intra- and extracellular concentration of oxygen ( (O$\sb2$)) in viable cells have been developed.
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Fusinite: A Coal-Derived EPR Probe for Oxygen. Mechanism and Application in Vivo and in Vitro
… exhibits a symmetric and exchange-narrowed electron paramagnetic resonance (EPR) line (g = 2.00276), with a first derivative peak-to-peak linewidth $(\Delta$B) which is reversibly broadened by molecular O$\sb2.$
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Spin Chemistry of Guest@Host Systems: H₂@C₆₀ and Nitroxide@Octa Acid
This thesis describes the nuclear and electronic spin chemistry of incarcerated guest molecules to form a guest@host complex in conjunction with the utility of nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) spectroscopy. The first chapter describes the background and …
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Picosecond studies of free radical reactions in solution
The 2,7-dihalofluorenylidenes 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 …
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The Free Radical Nature of Compound I From Horseradish Peroxidase and Chloroperoxidase
… Compound Is were analyzed by visible absorption, electron paramagnetic resonance (EPR), Mossbauer and electron nuclear double resonance (ENDOR) spectra. These spectral techniques were used to prove that one of the two oxidation equivalents associated with Compound I consists of a porphyrin …
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Spectroscopic Studies of Rhodium(ii) Perfluorobutyrate and Synthesis of Metallo-Hapten Complexes
… and several Lewis bases was investigated using electron paramagnetic resonance (EPR) and infrared (IR) spectroscopy. The shift of the g-value in the EPR spectra of the spin label complex 2,2,6,6-tetramethylpiperidinyloxy (TEMPO) and the shift of the infrared stretching frequency of carbon …
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Investigating Ligand Induced Conformational Changes in the Estrogen Receptor
… site-directed spin labeling (SDSL), 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) …
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The Fourier convolution-deconvolution method: its limitation and application
… tool for determining structure and function. The electron paramagnetic resonance (EPR) Fourier Convolution-Deconvolution method of measuring distance was utilized to determine the distance between two cysteine mutated residues in the linker region of Sso1p in order to determine the conformation of …
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Computer-assisted analysis of electron magnetic resonance spectra and the electron nuclear double resonance spectrum of isolated perylene cations
The analysis of electron paramagnetic resonance (EPR) spectra and the spectra from related techniques such as electron nuclear double resonance (ENDOR) spectroscopy, requires simulation of the experimental spectra. Simulating an experimental spectrum involves varying the values of several spectral …
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An investigation into Manganese(2+) interferences and retrospective dose assessment of shelled species using EPR spectroscopy
… the lower dose detection limit in 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 …
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Towards low dose retrospective dosimetry on shelled species
… species for retrospective dosimetry using electron paramagnetic resonance (EPR) spectroscopy. To determine applicable samples for low dose studies, shells of crustacean and mollusc species were irradiated to 10 Gy using a 137Cs source. Reference dosimetry was performed with alanine powder …
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Conformational changes in actinin-type actin binding domains: probing actin-induced structural dynamics in dystrophin and utrophin using EPR spectroscopy.
… poorly understood: x-ray crystallography and electron microscopy have produced conflicting 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 …
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Dynamics characterization for designing functional soft materials
… and characterization of samples spin-labeled for electron paramagnetic resonance (EPR) spectroscopy. By this approach, I developed insight into several soft-materials systems, including abiotic peptide tags, combinatorially selected for bioconjugation; fibronectin mimetic peptides, designed for …
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Exploration of Alkyne-bridged Multi[(Porphinato)metal] Oligomers for Charge Transport Applications and Spin-Spin Exchange Coupling Properties Using Synthetic, Spectroscopic, Potentiometric, and Magnetic Resonance Methods
<p>As silicon-based microelectronics approaches its fundamental physical limit, molecular electronics is emerging as a promising candidate for future ultra-dense electronic devices with individual molecules as active device components. The emerging of molecular spintronics, which exploits the …
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A novel wideband 140 GHz gyrotron amplifier
… cylindrical confocal waveguide using a gyrating electron beam. The electromagnetic theory, interaction theory, design processes and experimental procedures have been described in detail. The experiment has produced over 820 W peak power, 34 dB linear gain, and a -3 dB bandwidth of over 1.5 GHz …
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How do metalloenzymes propagate and control chemical reactions?
… case of substitution of hydrogen with fluorine). Electron Paramagnetic Resonance (EPR) and other forms of magnetic spectroscopy can be used to evaluate subtle differences imposed by substitution for controlling residues to a metal center, which gives further insight into the electronic …
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A study of SecA : the motor of the bacterial secretion system by site-directed spin labeling and EPR
… structure. We investigated these 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 …
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Dynamic nuclear polarization and electron spin resonance in paramagnetic solids at high field
… in high resolution solid state nuclear magnetic resonance spectroscopy have permitted the detailed structural study of large biological systems. The feasibility of many of these experiments is limited by the inherently low sensitivity of solid state NMR, and the implementation of complex …
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Biospeciation, Interaction with Biomolecules and Mechanism of Action of Potential Cu and V Drugs
… ionization mass spectrometry (ESI-MS), electron paramagnetic resonance (EPR) spectroscopy, quantum-mechanical (QM) calculations, and molecular docking. These studies identified specific binding sites, competition between ancillary ligands and protein residues, and stabilization of …
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