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 36 for “"Resonance Raman Spectroscopy"”.
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Resonance Raman spectroscopy of single-walled carbon nanotubes
… main technique for probing the phonon spectra is Raman spectroscopy and the many unique and unusual features of the Raman spectra of carbon nanotubes are highlighted. Various features of the first-order Raman spectra are emphasized, with regard to their 1D behavior and special characteristics, …
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Characterization of mucosal dysplasia with ultraviolet resonance Raman spectroscopy
Thesis (Ph. D.)--Harvard--Massachusetts Institute of Technology Division of Health Sciences and Technology, 1997.
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Evaluations of single walled carbon nanotubes using resonance Raman spectroscopy
… reports the results of two studies which use resonance Raman scattering to evaluate the vibrational properties of single walled carbon nanotubes (SWNTs). In the first study, we report an evaluation of second-order combination and over-tone modes in highly ordered pyrolytic graphite (HOPG), in …
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Surface enhanced resonance Raman spectroscopy of dyes: semi-quantitative trace analysis
… been carried out by means of surface enhanced Raman spectroscopy (SERS) and/or surface enhanced resonance Raman spectroscopy (SERRS) using citrate- and/or borohydride-reduced silver colloids employing laser exciting wavelengths equal to 514.5 and/or 632.8 nm. SERS and/or SERRS spectra are …
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Application of surface-enhanced resonance Raman spectroscopy to chlorophyll and chlorophyll derivatives
… photosynthesis. In Sections 1-3 surface-enhanced resonance Raman spectroscopy (SERRS) has been employed to obtain Raman vibrational spectra for chlorophyll a, pheophytin a, and chlorophyll b adsorbed on a roughened silver electrode and excited from within the Soret band to the lowest energy …
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The Effect of Red Blood Cell Velocity on Oxygenation Measurements using Resonance Raman Spectroscopy
Resonance Raman spectroscopy can be used to estimate the hemoglobin oxygen saturation. Previous studies have demonstrated that exposure of oxygenated red blood cells to laser illumination may result in photo-induced displacement of oxygen from hemoglobin. In this study, an in vitro model was used …
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Experimental and Theoretical Study of Resonance Raman Spectroscopy in Ground and Excited Electronic States
Spectroscopy is a powerful tool for the identification, study, and selective control of molecular processes. Raman scattering is particularly useful in observing the vibrational properties of molecules, and identifying compounds based on structure. While the experimental measurements provide …
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Investigating the Interactions Between the Thiolate Ligand and Mutants of a Conserved Tryptophan in the Proximal Heme Pocket of the Oxygenase Domains of Endothelial and Staphyloccus Aureus Nitric Oxide Synthases
… eNOSoxy, the endothelial isoform. UV/visible and resonance Raman spectroscopy have demonstrated that the mutants experienced increased basicity of the thiolate due to loss of the hydrogen bond between the mutated residue in the absence of the cofactor (6R)5,6,7,8-tetrahydrobiopterin (H4B). The …
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SPECTROSCOPIC CHARACTERIZATIONS OF THE COMPOUND II INTERMEDIATE OF SOYBEAN PEROXIDASE FROM SOYBEAN SEED COATINGS
… dynamics and reaction mechanisms to be studied. Resonance Raman spectroscopy was used as a means of characterizing the structure of the soybean peroxidase and its intermediates. Excitation in the Soret absorption band at 406.7nm with 2-5mW laser power was used for this study. Resonance Raman …
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Understanding the mechanism of androgen biosynthesis
… the ferric, oxy-ferrous, and peroxo- states by resonance Raman spectroscopy in order to answer this essential question. Presence of an inverse solvent isotope effect during dehydroepiandrosterone formation, as well as functional lyase catalysis by a CYP17A1 mutant possessing an impaired …
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Nanophotonic split-ring resonators as dichroics for molecular spectroscopy
… ultra sensitive biosensors based on vibrational spectroscopy. Through strict engineering of structural morphology, a nanometal’s free electrons can be tuned to resonate at a particular frequency, resulting in amplification and confinement of the electromagnetic field around certain areas of the …
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STUDIES ON THE REACTION OF HIGH-DOSE HYDROXOCOBALAMIN AND ASCORBIC ACID WITH CARBON MONOXIDE: IMPLICATIONS FOR TREATMENT OF CARBON MONOXIDE POISONING
… that this conversion should be detectable. Using resonance raman spectroscopy we demonstrated that a mixture of hydroxocobalamin and ascorbic acid could create the reduced form of hydroxocobalamin. We used a closed-loop circulation system with a hollow-fiber membrane oxygenator to produce …
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Photophysics of carbon nanotubes
… experiments. The frequencies of the Raman-active phonon modes also become very sensitive to the geometrical structure of small-diameter carbon nanotubes. In particular, certain phonon modes exhibit anomalous behavior that significantly affects resonance Raman spectra of small-diameter …
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Optical studies of DNA-wrapped carbon nanotubes
… single walled carbon nanotubes. Using resonance Raman spectroscopy (RRS) and photoluminescence spectroscopy (PL), a careful characterization has been carried out on different DNA-wrapped SWNT samples to study the effects of DNA wrapping on the electronic and vibrational structure of …
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Structure-Function Relationship Studies of the Rhodobacter Sphaeroides Cytochrome AA(3)
… through site-directed mutagenesis and resonance Raman spectroscopy. Residues coordinating the calcium ion in R. sphaeroides cytochrome c oxidase have been mutated to mimic the metal binding site of bovine mitochondrial oxidase. Residues in a putative oxygen channel to the active site …
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Multiscale Insights into Molecular Interfaces: STM Imaging and Ultrafast Laser-Induced Dynamics
… determined through Fourier analysis of STM data. Resonance Raman spectroscopy and density functional theory (DFT) calculations provided further insight into the dominant molecular conformer, confirming that the C2 cis structure is favored in both crystal and surface-bound states. To extend …
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Biochemical Studies on the Catalytic Cycle of Cytochrome C Oxidase in Rhodobacter Sphaeroides
… were characterized with Electron Paramagnetic Resonance spectroscopy and resonance Raman spectroscopy. The role of tyrosine-288 was discussed in terms of the presence of a covalent linkage between Y288 and H284 and the formation of a tyrosyl radical species in the catalytic cycle of cytochrome …
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Forensic applications of raman spectroscopy
The forensic applications of Raman spectroscopy have been explored and extended using the development of novel sampling techniques and task-specific instrumentation described in this thesis. The phenomenon of Raman scattering, enhanced Raman scattering and their relevance in forensic investigations …
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Raman Studies of Acyl-Homoserine Lactones
<p>This thesis describes the use of various Raman spectroscopy techniques for the detection of N-acyl homoserine lactones (AHLs), which are quorum sensing molecules used in bacterial communication. The advantage of using Raman spectroscopy over other techniques is the possibility of in-situ …
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