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 32 for “"Fluorescence Lifetimes"”.
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Development of an Optical System for Measuring Fluorescence Lifetimes
… of a cost-effective, portable, and simplified fluorescence detection system for measuring fluorescence lifetime decay as an alternative to the available methods currently in use. There are multiple systems available to detect fluorescence of a sample, but they contain multiple parts and require …
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Determining rare earth dopant concentrations in optical fibres and waveguides
The fluorescence lifetimes of rare earth-doped fibres and waveguides were studied in this thesis to determine whether the fluorescence lifetime could be used as a means for determining the rare earth concentrations. The performance of rare earth-doped devices is dependent on many parameters, …
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Synthesis of Fluorescent Molecules and their Applications as Viscosity Sensors, Metal Ion Indicators, and Near-Infrared Probes
… by UV or visible light. A 30-fold enhancement of fluorescence intensity of dU-BZ was achieved in a viscous environment. Values of fluorescence quantum yields in 99% glycerol/1% methanol (v/v) of varying temperature from 293 K to 343 K, together with fluorescence quantum yields, radiative and …
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Plasmonics for On-Chip Photodetectors and Light Sources
… noise. Further, the significant reduction in fluorescence lifetimes observed for quantum emitters coupled to nanophotonic cavities enhances their viability for use in quantum memory schemes. Many solid-state quantum memories suffer from short coherence times; however, if the fluorescence …
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Solute effects on the production and decay of primary species in the flash photolysis of indole
… of the solutes NaBr, BaCl2*2H20 and CdSCV Fluorescence spectra and fluorescence lifetimes have also been obtained in the absence and in the presence of the above solutes, The hydrated electron is produced monophotonically and biphotonically at an apparent maximum rate which is increased by …
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Influence of metal nanoparticles on fluorescence properties
… and gold nanoparticles of various sizes on the fluorescence properties of tris (2, 2-bipyridyl) dichloro ruthenium (II) hexahydrate (Ru (bpy)3 2+), tryptophan and phenylalanine. For (Ru (bpy)3 2+) absorbed on silver and gold nanoparticles, the fluorescence intensity was quenched and showed a …
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Luminescent Properties of Anthracene-based Metal-Organic Frameworks
… absorption and emission spectra as well as the fluorescence lifetimes of the MOFs were compared to that of the corresponding ligand in solution. The MOFs comprising 9,10-ADCA and 2,6-ADCA formed highly crystalline octahedral shaped crystals and were found to be isostructural with the well-known …
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Design, synthesis and characterization of photocage molecules for light-activated release: Applications in polymer chemistry and phototherapeutics
… the internal conversions and allowing longer fluorescence lifetimes. Quantum yield of photorelease were better for all the deuterated compounds in comparison to their non-deuterated analogs with 25-93% increase. The deuterated samples had extended fluorescence lifetimes as observed by time …
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Vibrational Spectroscopy and Potential Energy Surface Analysis of the X˜ And B˜ States of Thiophosgene
… levels, have been measured by dispersed fluorescence spectroscopy. More than 370 of these vibrational fundamentals, overtones, and combination bands were assigned and fit with a simple spectroscopic Hamiltonian. Observed transitions are highly Franck-Condon active in the CS stretching …
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Studies of measurement techniques for indirect chemical sensing based on fluorescence spectroscopy and applications for fibre-optic sensors
… Rapid Lifetime Detection (RLD) scheme, a fluorescence interrogation method based on direct interrogation of the decay curve following pulsed excitation was generalised, and a novel method for optimising measurement precision derived. The effect of background light on the optimum was …
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Detailed study of Er:YAG-derived optical fiber
… cross-section peak of 0.65 pm2 near 1530 nm. Fluorescence lifetimes of the 4I13/2 energy state were found to decrease with erbium concentration. Relative abundances of isolated and clustered Er3+ sites were identified from the radiative decay measurements. The maximum upper state lifetime was …
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Alternative strategies for security labelling/encoding of paper and plastic products.
… detect all three dopants based on their discrete fluorescence signals and unique fluorescence lifetimes has been achieved with an in-situ detector. This has advantages over current fluorescent dye labels which have broadband spectra that quickly overlap each other reducing their number of …
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The ATP synthase from spinach chloroplasts (Spinacea oleracea) : improved isolation and purification of the enzyme and conformational changes observed with fluorescent labels
… which can be investigated with the help of Fluorescence Resonance Energy Transfer (FRET), Fluorescence Lifetimes (FL) or with Fluorescence Correlation Spectroscopy (FCS). <br>Fluorescent probes were used to selectively label different subunits of CF1, in order to conduct spectroscopic …
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Development of fluorescence lifetime imaging microscopy techniques for analysis of single extracellular vesicles
… This thesis presents the first use of two-photon fluorescence lifetime imaging microscopy (FLIM) to characterize the free and protein-bound reduced forms of nicotinamide adenine dinucleotide and nicotinamide adenine dinucleotide phosphate (NAD(P)H) content of EVs derived from cells, human urine, …
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Investigating the aggregation of TDP-43 in models of Amyotrophic Lateral Sclerosis
… pathogenic aggregate species using FLIM (Fluorescence lifetime imaging microscopy) and demonstrate decreased fluorescence lifetimes of EGFP-tagged TDP-43 following MG132 stress induction and we correlated these data with an in vitro model system of liquid droplet formation. Using …
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Two-Photon Microscopy of E-Combretastatin uptake and activation in live mammalian cells
… into tissues and minimizes cellular autofluorescence compared withUV/visible light.The work described in this thesis is highly multidisciplinary. A major task was the synthesisof a range of combretastatin derivatives as target compounds for the novel form oftwo-photon excited anticancer …
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Synthesis and evaluation of novel antivascular agents for two-photon activation
… 280 – 390 nM). Photochemical properties such as fluorescence lifetimes, fluorescence quantum yields, and two-photon absorption characteristics of the combretastatin derivatives were investigated spectroscopically. Fluorescence-lifetime imaging microscopy (FLIM) and light sheet fluorescence …
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The spectral and photophysical characterization of water solubilizing metal phthalocyanines for highly sensitive detection in biological studies
… difficult, high intrinsic biological fluorescence and structural differences of the dyes leading to differences in the electrophoretic mobility of labeled oligonucleotides, complicating sorting using electrophoresis. The use of labeling dyes that fluoresce in the near-IR has several …
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Quantitative frequency-domain fluorescence spectroscopy in tissues and tissue-like media
… such cases, contrast enhancements are required. Fluorescence spectroscopy is an attractive component of optical tissue spectroscopy. Exogenous fluorophores, as well as some endogenous ones, may furnish the desperately needed sensitivity and specificity that is lacking in near-infrared optical …
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Thermal and denaturation studies of the time-resolved fluorescence decay of superoxide dismutase
Time-resolved fluorescence of single tryptophan proteins have demonstrated the complexity of protein dynamic and structure. In particular, for some single tryptophan proteins, their fluorescence decay is best described by a distribution of fluorescence lifetimes rather than one or two lifetimes. …
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