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Dissertations / Theses on the topic 'Fluorescence quantum yields'

Author: Grafiati

Published: 24 April 2022

Last updated: 30 July 2025

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1

Hutcheson, Ryan Mitchell. "Quantitative prediction of dye fluorescence quantum yields in proteins." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/hutcheson/HutchesonR0509.pdf.

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The application of a method previously developed by Callis et al. to predict the quantum yields of Trp fluorescence has been successfully applied to the fluorescence of fluorescein and flavins in proteins. The calculated lifetime range of 2 ps - 4 ns is in agreement with experiment. The fluctuations in the electron transfer rate are shown to be dictated by the fluctuations in the density of states. This is evident by the comparison of the fractional deviation of the interaction, density of states and the rate. Here the fluctuations in the density of states is an order of magnitude larger than

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2

Pandelieva, Antonia. "Increasing the Quantum Yield of Red Fluorescent Proteins Using Rational Design." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34272.

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Monomeric red fluorescent proteins (RFPs) are used extensively for applications in molecular biology research, and are especially suited for whole body imaging applications due to their longer excitation and emission wavelengths, which are less damaging and penetrate deeper into animal tissue. However, these proteins suffer from reduced brightness compared to other fluorescent proteins, and require further engineering, which is often achieved through random methods, incurring large time and resource costs. Here we propose a rational design approach to improve the quantum yield of RFPs by reduc

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3

Bone, Emma Lewis. "A novel approach to investigating chlorophyll-a fluorescence quantum yield variability in the Southern Ocean." Doctoral thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/31089.

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The apparent fluorescence quantum yield of chlorophyll-a (ΦF ), i.e. the ratio of photons emitted as chlorophyll-a fluorescence to those absorbed by phytoplankton, serves as a first order measure of photosynthetic efficiency and a photophysiological indicator of the resident phytoplankton community. Drivers of ΦF variability, including taxonomy, nutrient availability, and light history, differ in magnitude of influence across various biogeographic provinces and seasons. A Multi-Exciter Fluorometer (MFL, JFE Advantech Co., Ltd.) was selected for use in in situ ΦF derivation and underwent an ext

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4

Jose, Jiney. "Water-soluble benzophenoxazine dyes: syntheses, derivatization and photophysical studies." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4915.

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A set of three benzophenoxazine dyes, two completely soluble and one partially soluble in aqueous media, has been prepared and their spectroscopic properties examined. These dyes can be used as either donor or acceptor in synthesis of through-bond energy transfer cassettes. Structural modifications prevented aggregation in water and improved their fluorescence properties in water. Their absorption and emission were studied in both organic and aqueous media. Two of the three dyes have superior quantum yields in aqueous media as compared to other reported dyes. Improved quantum yield makes these

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5

Legault, Sandrine. "Investigating Different Rational Design Approaches to Increase Brightness in Red Fluorescent Proteins." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42740.

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Red fluorescent proteins (RFPs) are used extensively in biological research because their longer emission wavelengths are less phototoxic and allow deeper imaging of animal tissue. However, far-red RFPs generally display low brightness, emphasizing the need to develop brighter variants. Here, we investigate three approaches to rigidify the RFP chromophore to increase the quantum yield, and thereby brightness. We first used computational protein design on a maturation-efficient mRojo-VHSV variant previously engineered in our lab to introduce a Superdecker motif, a parallel pi-stack comprising a

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6

Uejima, Motoyuki. "Theoretical Design of Light-Emitting Molecules Based on Vibronic Coupling Density Analysis." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188601.

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7

Miasojedovas, Arūnas. "Control of fluorescence properties of organic optoelectronic materials by molecular aggregate formation." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130930_092153-02661.

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Currently, organic electronics is one of the most expanding technology of semiconductor devices. This direction is rapidly developing due to the constant synthesis of new organic compounds and sophisticated advances in device engineering. Currently, organic materials are used in organic light-emitting diodes (OLEDs), organic thin-film transistors, solar cells and sensors. Low-cost manufacturing techniques such as wet casting or inkjet printing enable organic materials use in large-area and flexible electronic devices. Modern organic electronic materials are multifunctional – this enables not o

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8

Liyanage, Geethika Kaushalya. "Infrared Emitting PbS Nanocrystals through Matrix Encapsulation." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1403953924.

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9

Novák, Pavel. "Vývoj cell-sorter systému s využitím optické pinzety a mikrofluidních čipů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219024.

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In this master thesis I have been dealt with the design and construction of an instrumental platform that used positioning focused laser beam (so-called optical tweezers) for manipulation with living cells without their damage.

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10

Bernhard, Claire. "Synthèse d'agents chélatants bifonctionnels macrocycliques pour le marquage de molécules biologiques par des métaux : application en imagerie médicale." Thesis, Dijon, 2011. http://www.theses.fr/2011DIJOS024/document.

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L’imagerie moléculaire est devenue incontournable pour le diagnostic et le traitement de cancers. Cette discipline regroupe un ensemble de techniques telles que la tomodensitométrie (CT), l’Imagerie par Résonance Magnétique (IRM), l’imagerie optique ou encore l’imagerie nucléaire (tomographie par émission de positons TEP, tomographie d’émission monophotonique TEMP). Chacune de ces techniques possède ses propres avantages et inconvénients et ne peut apporter à elle seule des informations anatomiques et fonctionnelles suffisantes. Les travaux actuels sont portés sur la conception de systèmes dit

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11

Guelfucci, Jean-Pierre. "Contribution a l'etude des mecanismes de photoionisation et de photoconduction dans les dielectriques liquides non polaires." Toulouse 3, 1986. http://www.theses.fr/1986TOU30029.

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Mesure du niveau de conduction d'alcanes et de cycloalcanes par difference de travaux de sortie metal/liquide, metal/vide de photocathodes en zinc ou en or irradiees par photons uv. Mise en evidence du role des etats de surface. Determination du seuil d'ionisation par photoionisation de liquides avec des photons de 7 a 10 ev. Comparaison des courbes a la theorie d'onsager. Etude de la nature des etats precurseurs a la paire separee ion-electron

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12

Gylle, A. Maria. "Physiological adaptations in two ecotypes of Fucus vesiculosus and in Fucus radicans with focus on salinity." Doctoral thesis, Mittuniversitetet, Institutionen för naturvetenskap, teknik och matematik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-13308.

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The in origin intertidal marine brown alga Fucus vesiculosus L. grow permanently sublittoral in the brackish Bothnian Sea, side by side with the recently discovered F. radicans L. Bergström et L. Kautsky. Environmental conditions like salinity, light and temperature are clearly different between F. vesiculosus growth sites in the Bothnian Sea (4-5 practical salinity units, psu; part of the Baltic Sea) and the tidal Norwegian Sea (34-35 psu; part of the Atlantic Ocean). The general aims of this thesis were to compare physiological aspects between the marine ecotype and the brackish ecotype of F

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13

Gür, Fatih Nadi. "Plasmonic waveguides self-assembled on DNA origami templates: from synthesis to near-field characterizations." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235762.

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Manipulating light by controlling surface plasmons on metals is being discussed as a means for bridging the size gap between micrometer-sized photonic circuits and nanometer-sized integrated electronics. Plasmonic waveguides based on metal nanoparticles are of particular interest for circumventing the diffraction limit, thereby enabling high-speed communication over short-range distances in miniaturized micro-components. However, scalable, inexpensive fine-tuning of particle assemblies remains a challenge and near-field probing is required to reveal plasmonic interactions. In this thesis, self

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14

Zhang, Yu. "Fabrication, structural and spectroscopic studies of wide bandgap semiconducting nanoparticles of ZnO for application as white light emitting diodes." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI046.

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La présente thèse étudie les nanoparticules de ZnO incorporées dans une matrice d'acide polyacrylique (PAA) mésosphérique synthétisée via un protocole d'hydrolyse. La structure hybride mésosphérique de ZnO / PAA a précédemment démontré son efficacité pour émettre de la lumière visible dans une large gamme, qui résulte des défauts intrinsèques de niveaux profonds dans les nanocristaux de ZnO. Pour modifier davantage le spectre de photoluminescence (PL) et améliorer le rendement quantique de PL (PL QY) du matériau, le ZnO dopé au métal et le ZnO / PAA revêtu de silice sont fabriqués indépendamme

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15

CHEN, ZONG-QIN, and 陳宗欽. "The research of fluorescence quantum yield of sensitizers." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/79089205800233168409.

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16

Wang, Guo-Quan, and 王國權. "Preparation and Surface Functionalization of AgInS2 Quantum Dots with High Fluorescence Quantum Yield and Their Cell Imaging Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/5zxy7d.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>100<br>In this research, we report the effect of the initial Ag:In stoichiometry, capping ligand concentration, and reaction temperature on the optical properties of AgInS2 quantum dots (QDs). The fabricated QDs exhibit excellent optical characteristics, including PL quantum yields of up to 22 % and the appearance of an excitonic absorption peak. This is the first reported observation of such a well-defined exciton absorption feature in AgInS2 QDs. Its appearance could indicate a relatively narrow size distribution or minimization of nonradiative recombination at the

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17

林明翰. "Effects of Sulfuric Acid on Quantum Yield of Hydrothermally Synthesized Fluorescent Carbon Nanodots." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/18348610745125003077.

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碩士<br>逢甲大學<br>化學工程學系<br>104<br>Since the discovery in 2004, fluorescent carbon nanodots (FCNDs) have received wide attention due to their excellent biocompatibility and fluorescence. The fluorescent property enables FCNDs to be applied to bioimaging, biosensing, and photocatalysis. To effectively increase the quantum yield (QY) of FCNDs has been an issue of study. The hydrothermal method is widely used to synthesize FCNDs because of simple operation among other methods such as laser ablation and microwave heating. The basic principle of the hydrothermal method is to put the precursor of carbon

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18

Chen, Hao, and 陳灝. "Syntheses, Characterizations and Applications of New High Quantum Yield Red/NIR Fluorescent Molecules." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/96saqa.

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碩士<br>國立臺灣大學<br>化學研究所<br>106<br>This thesis is composed of two major parts. First part, we introduced fluorene core to synthesize three new high photoluminescence (PL) quantum yield red/NIR fluorescent molecules. Second part, we designed a new water-soluble two-photon absorption (TPA) chromophore. 　　Over the last few decades, TADF-type organic light-emitting diodes (OLED) is rapidly expanding, and the internal quantum efficiency (IQE) has already reached to 100%. However, it is difficult to design a red/NIR TADF molecule with high PL quantum yield and good light color purity. In this research

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19

Habenstein, Florian. "Engineering of a NIR fluorescent protein for live-cell nanoscopy." Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-148A-9.

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20

Maity, Anjan. "Higher-Order Assembly of Protein Protected Gold Nanoclusters using Supramolecular Host-Guest Chemistry: A 40% Absolute Fluorescence Quantum Yield." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5781.

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For the last few decades, cancer has been one of the major public health concerns, and the mortality rate has become significant worldwide. However, because of the blessing of science, the early detection of tumors and the survival rate of patients have improved extra 5-years. Therefore, early-stage cancer detection and identification are critical in cancer treatment. Although priority must be given to providing the treatment option, simultaneously, it is also important to design new and improve the existing methods, which are the noble job for the scientist. Recently, gold nanoclusters (Au

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21

Ruhlandt, Daja Talina Helga Wilhelmine. "Modeling electrodynamics in the vicinity of metal nanostructures." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E5BF-2.

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22

Azeredo, Alexandra Silva. "Synthesis of fluorescent carbon nanoparticles: optimization based on quantum yield and preliminary studies for future application in the chemical control of nitrites." Master's thesis, 2021. https://hdl.handle.net/10216/138845.

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23

Gür, Fatih Nadi. "Plasmonic waveguides self-assembled on DNA origami templates: from synthesis to near-field characterizations." Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A31000.

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Manipulating light by controlling surface plasmons on metals is being discussed as a means for bridging the size gap between micrometer-sized photonic circuits and nanometer-sized integrated electronics. Plasmonic waveguides based on metal nanoparticles are of particular interest for circumventing the diffraction limit, thereby enabling high-speed communication over short-range distances in miniaturized micro-components. However, scalable, inexpensive fine-tuning of particle assemblies remains a challenge and near-field probing is required to reveal plasmonic interactions. In this thesis, self

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