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Showing 1 to 11 of 11 for “"EPR (Electron Paramagnetic Resonance)"”.
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Investigation of the Triplet State Properties of Bis(chlorophyll)cyclophane and Its Partially Metalated Derivatives
… cyclophanes were studied using light modulated EPR (electron paramagnetic resonance) techniques on frozen solutions at 9K.
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Porphyrin-DNA as scaffold for nanoarchitecture and nanotechnology
… industrial applications, e.g. in making optical electronic devices, in artificial photosynthesis or in sensors. In contrast, DNA has only recently been found to be a good scaffold for the construction of functional molecules. Combining the chemical properties of porphyrins and DNA could open the …
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Structure and Dynamics of AcrA, a Periplasmic Component of a Multidrug Efflux Pump
… mechanism, site-directed spin labeling (SDSL)/EPR (electron paramagnetic resonance) spectroscopy is used to investigate the structure and dynamics of AcrA in solution. My results demonstrated that AcrA is a dynamic protein that undergoes pH-dependent and reversible conformational changes. AcrA …
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Chemical probes for the study of mitochondrial oxidative stress
… source of reactive oxygen species (ROS) via the electron transport chain. ROS may be free radicals, or molecules that rapidly form free radicals. These free radicals can undergo various rapid reactions with cellular components resulting in cell damage, and eventually cell death. Therefore, there …
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The Binding Pockets of QA and QB in the Photosynthetic Reaction Center of Rba. sphaeroides Probed by Pulsed EPR
… absorption by the reaction center results in electron transfer through a series of cofactors, the final two are identical ubiquinones (QA and QB). Both ubiquinones can be stabilized in their reduced (semiquinone) state allowing for their binding pockets to be studied with EPR (electron …
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Approaching magnetic field effects in biology using the radical pair mechanism
… radical pair, a system composed of two unpaired electron spins whose spin motion is affected by nearby nuclear spins via the hyperfine interaction, by applied magnetic fields via the Zeeman effect, and by each other via the exchange and dipole interactions. The spin motion varies in …
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Molecular detection and charcaterisation of biologically relevant free radicals during surgical ischaemia-reperfusion
… B3LYP/6-31+G(d,p), B3LYP/6-311++G(d,p) and B3LYP/EPR-II levels for two conformers (1 and 2) of L-ascorbic acid and their respective oxidation products to monodehydroascorbates of ab-initio methods by Gaussian O3W package. Conformer 1, free radical properties are compared with previously published …
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Charakterisierung und Kristallisation der Elektronen-einspeisenden Module der F<sub>420</sub>H<sub>2</sub>-Dehydrogenase
… Schwefel von 1,5 mol pro mol Protein auf. EPR Analysen der aufgereinigten Proteine ergaben Hinweise auf das Vorkommen von mindestens zwei [4Fe-4S] Zentren in den Input Modulen (FqoF/FpoF) und auf ein [2Fe-2S] Zentrum in der FpoO Untereinheit. In Kristallisationsexperimenten konnten die …
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Development of Low Frequency Electron Paramagnetic Resonance Methods and Instrumentation for Biological Applications
<p>EPR is a powerful biophysical tool that can be used to measure tumor physiology. With the addition of magnetic field gradients, the spectral properties of paramagnetic species can be mapped. To facilitate EPR imaging, methods and instrumentation at frequencies between 250 MHz and 1 GHz were …
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Biochemical characterization of a-type heme-copper oxidases in escherichia coli, bacillus subtilis and thermus thermophilus
… and quinone binding site was examined using EPR spectroscopy. Overall, the hyperfine coupling shows difference between ubiquinone and menaquinone semiquinone with quinone binding site in cytochrome bo3, suggesting different binding geometry. Three nitrogens were indicated interacting with …