Results 281 to 290 of about 1,075,830 (357)

Quenching of Fluorescence

1983
Fluorescence quenching refers to any process which decreases the fluorescence intensity of a given substance. A variety of processes can result in quenching. These include excited state reactions, energy transfer, complex formation, and collisional quenching.
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FLUORESCENCE QUENCHING IN PHENYLALANINE AND MODEL COMPOUNDS*

Photochemistry and Photobiology, 1972
Abstract— The effects of the carboxylic and amino groups in their neutral and charged forms on the absorption and emission properties of phenylalanine are analyzed with the help of model compounds containing either substituent. Fluorescence yields of phenylalanine and model compounds were measured as a function of pH.
J, Tournon, E, Kuntz, M A, el-Bayoumi
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Thermodynamics of the quenching of tyrosyl fluorescence by dithiothreitol

Biochemistry, 1987
Tyrosyl fluorescence quenching by oxidized dithiothreitol (DTTo) in N-acetyl-L-tyrosine N'-methylamide, and native bovine pancreatic ribonuclease A and its reduced, S-methylated form, in aqueous solution is studied at pH 3.0. From the temperature dependence of the fluorescence quenching, it is demonstrated that the mechanism of the quenching process is
J K, Swadesh, P W, Mui, H A, Scheraga
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Fluorescence quenching of organic molecule by insulator

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2013
A new kind of fluorophore 2-(4-fluorophenyl)-1-phenyl-1H-benzo[d]imidazole (FPPBI) has been synthesized and characterized by (1)H NMR, (13)C NMR, mass spectral studies and single crystal XRD. The energy transfer from FPPBI to Al2O3 nanocrystals has been studied by absorption, fluorescence and lifetime spectroscopic methods.
C, Karunakaran, J, Jayabharathi, K, Jayamoorthy   +2 more
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Fluorescence‐quenching‐resolved spectroscopy of proteins

European Journal of Biochemistry, 1988
A new procedure is described for using fluorescence‐quenching data of tryptophan residues in proteins to resolve their fluorescence emission spectra. In this concept the Stern‐Volmer quenching plot is determined at each particular emission wavelength and itterative non‐linear least‐squares fitting procedure allowed to resolve the steady‐state emission ...
Z, Wasylewski, H, poloczek, A, Wasniowska   +2 more
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The quenching of anthracene fluorescence

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1951
The quenching of the fluorescence of anthracene excited by light of wave-length 3650 Å by oxygen, sulphur dioxide, and by carbon tetrabromide, has been investigated both in the gaseous state and in paraffin solutions of viscosities from 0·003 to 1·9 poises. In the gaseous state quenching occurs on nearly every collision.
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Quenching of fluorescence in C60 fulleropyrrolidines by chloroform

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2016
Functionalized [C60] fullerene, fulleropyrrolidines were synthesized and their photophysical properties are studied. The absorption and emission patterns are altered in fulleropyrrolidines, when compared with C60. Fluorescence of the molecules is quenched by CHCl3 in toluene solution at room temperature.
Abdulrazack, Parveen, Venkatesan, Sughanya, Samuthira, Nagarajan   +2 more
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Fluorescence quenching of adriamycin by specific antibodies

Immunochemistry, 1975
Abstract The interaction of adriamycin, daunomycin, N-acetyldaunomycin, daunomycin benzolhydrazone and adriamycinone with rabbit and goat antibodies to adriamycin results in quenching of the fluorescence intensity of these haptens. In solvent of low dielectric constant, the fluorescenc of the ligands is enhanceda and peak at longer wavelength appears.
Y H, Chien, L, Levine
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Fluorescence quenching immunoassay of serum cortisol

Steroids, 1980
Fluorescence quenching immunoassay of serum cortisol was established. The minimal amount of cortisol detected was 3.1 ng/tube and serum concentration of 3.1 micrograms/dl to 100 micrograms/dl of cortisol could be measured. Intra- and inter-assay coefficient of variation were 7.7-10.5% and 10.7-13.3%, respectively.
Y, Kobayashi, N, Tsubota, K, Miyai, F, Watanabe   +3 more
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Quenching of the fluorescence of pterin derivatives by anions

Photochemical & Photobiological Sciences, 2004
Steady-state and time-resolved studies of the fluorescence of pterins in aqueous solutions in the presence of different anions have been performed using the single-photon counting technique. In the pH range between 3 and 13, most pterins exist in a protonated and a deprotonated form.
Carolina, Lorente, Alberto L, Capparelli, Andrés H, Thomas, André M, Braun, Esther, Oliveros   +4 more
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