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 91 for “"fluorescence emission"”.
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A feasibility evaluation of x-ray fluorescence emission tomography and x-ray luminescence tomography for real-time assessment of photodynamic therapy
… x-ray induced PDT, which in combination of x-ray fluorescence computed tomography (XFCT), can produce a quantifiable therapeutic effect at greater bodily depths. This work demonstrates a novel combinatorial system of X-ray Fluorescence and X-ray Luminescence Computed Tomography (XLCT) to image …
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Development and evaluation of a fluorescence emission ratio-based fiber opticpH measurement system for use in monitoring changes in tumor pH during clinical hyperthermia
… to pH have been studied based on absorption and fluorescence. Absorption based optrodes are difficult to fabricate due to the complex nature of the required optical geometry. Fluorescence based optrodes have been developed based upon either a single emission intensity measurement at a specific …
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Chemical modification of the surface of wool
… and extent of photoyellowing of wool and on the fluorescence emission and excitation spectra of wool are noted. Acetic anhydride has the most profound effect on both properties. The possible identity of the compound(s) that contribute to the fluorescence emission spectrum of wool at 450 nm are …
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Selenium-induced Enhancement of Hematoporphyrin Derivative Phototoxicity in Murine Bladder Tumor Cells
… Sodium selenite was found to enhance the fluorescence emission of Hpd and augment the Hpd-sensitized photooxidation of tryptophan. The data indicate that sodium selenite is able to disaggregate Hpd, thereby enhancing Hpd-sensitized phototoxicity.</p>
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Highly sensitive biosensors using photonic crystal enhanced fluorescence
Due to the importance of fluorescence assays in clinics, life science and genomic research, many nanostructures have been proposed to enhance the weak fluorescence signals from low abundance analytes. Among these structures, photonic crystal (PC) has attracted particular attentions because of its …
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Investigating optical microplastic detection methods using fluorescent staining through Nile Red
… investigations are presented. First, the fluorescence emission spectra of various plastic and organic samples stained with Nile Red is presented. The motivation behind this study was to identify the strongest fluorescence emission peaks for NR-stained plastics under a series of different …
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Quantum dot labelled antimalarials and investigation of their interaction with synthetic haemozoin
… dots (QDs) in order to exploit their particular fluorescence properties during the investigation of the interaction. The synthesis of a chloroquine derivative was used in order to insert a primary amino function in the drug suitable for the coupling with QDs. The formation of this derivative (N 1 …
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Decoding the history of the early solar system using comet volatile compositions
… nucleus) composition of comets via analysis of fluorescence emission in cometary comae. Sampling fluorescence emission from a suite of primary volatiles has become possible from state-of-the-art ground-based observatories.</p><p>An overarching goal of comet volatile composition studies is …
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Fluorescence in reef corals
Fluorescence can be a powerful tool for probing biological systems. Prior measurements from Caribbean corals identified five fluorescing pigments in reef corals. In this thesis I study coral fluorescence spectra. I wanted to learn if fluorescence could be useful for large scale mapping and …
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A Vertically Loaded Diamond Microdisk Resonator (VLDMoRt) towards a Scalable Quantum Networks
… center in diamond for efficient collection of fluorescence emission into low numerical aperture (NA) free-space modes. The VLDMoRt achieves a Purcell enhancement of 172 with 39% of the emitted light collected within a NA of 0.6, leading to a total external spin-photon collection efficiency of …
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Studies on new approaches of chiral discrimination for chiral analysis by regression modeling of spectral data.
… chiral analysis techniques, the isotropic UV or fluorescence spectra of solutions of the reaction matrix containing the derivatized enantiomers were subjected to partial least squares regression (PLSR) modeling. PLSR was used as a means of extracting latent or structured information from the …
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Fluorescent chemosensors for metal ions based on photoinduced electron transfer (PET) from sulfur
The use of fluorescence for the detection of metal ions is a very powerful technique since it allows the analysis of traces amounts of specific analytes by a simple optical method. However, metal ions are not fluorescent, and in order to detect non-emissive targets using fluorescence spectroscopy …
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Fluorescence Studies of Photosystem II Fluorescence Quenching During Desiccation
… coupled to PSII and characterized by a fast-fluorescence decay lifetime, and long-wavelength emission. The present study compares the relative ability of green algae and lichens to recover photosynthetic activity after periods of desiccation using steady state fluorescence emission …
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Multi-Walled Carbon Nanotubes-Modified Polymer Organic Photovoltaics
… properties, which are optical absorption, fluorescence emission, and morphology, as well as the formed photovoltaic device performance. This fundamental research would significantly contribute to the advanced technology development for how to improve the efficiency of the polymer organic …
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Surface Characteristics of Bacillus Spores
… scanning electron microscopy, and steady-state fluorescence by spectroscopy. The morphology of spores was similar within taxonomic groups and dissimilar between groups. Spore hydrophobicity ranged from 0.3% to 65% and all spores had fluorescence emission peaks at 335 nm and 450 nm. The …
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Interaction of Metal Nanoparticles with Fluorophores and Their Effect on Fluorescence
… tend to get excited by incident light and emit fluorescence, whereas larger nanoparticles absorb the incoming light very strongly due to their LSPR. In this study we observed the outcomes of the interaction between two types of nanoparticles, namely gold and gold/silver alloyed nanoparticles …
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Multi Scale Fluorescence Studies: The Spinning Disk Confocal Fluorescence Lifetime Imaging Microscopy & Single Molecule Nano-Metronome & Single Molecule Study of Tetramethyrhodamine -Dna Interaction
… absence of any biological activities of DNA, the fluorescence emission of TMR undergoes multiple slow transitions among at least four different fluorescence states. While the actual number of fluorescence states and therefore the actual rates of transition among them remains open for discussion …
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Characterization of the phosphorylation of thylakoid membrane proteins from cyanobacterium synechococcus sp. PCC 6301 in light state 1 and light state 2
… in state 1 and state 2 was investigated. 77 K fluorescence emission spectra revealed that rapidly isolated thylakoid membranes retained the excitation energy distribution characteristic of intact cells in state 1 and state 2. Phosphoproteins were identified by gel electrophoresis of both …
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Fluorescence Depolarization Study of Internal Tryptophan Mobility in Hydrated Azurin Films
… dynamics was investigated using steady state fluorescence depolarization on azurin, which has a single tryptophan residue well-buried in the hydrophobic interior. Azurin was imbedded in a thin, solid, water-permeable polymer film. This procedure inhibited whole-protein motion while allowing …
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