Results 261 to 270 of about 121,227 (315)

Fluorescence quenching studies with proteins

Analytical Biochemistry, 1981
Abstract A review is presented on the use of the technique of solute fluorescence quenching to study the structure and dynamics of proteins. A number of factors are discussed that must be considered in analyzing such data. Among these factors are the efficiency of the quenching process, the relative importance of static quenching, the heterogeneity ...
M R, Eftink, C A, Ghiron
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On mechanisms of fluorescence quenching by water

Biophysics, 2014
Mechanisms of fluorescence quenching of aromatic chromophores by water are reviewed. The mechanisms include polarity of chromophore environment, proton or electron transfer between the excited chromophore and water. A hypothesis is proposed that the quenching can be a result of chromophore-solvent hydrogen bond breaking in the excited state.
G E, Dobretsov, T I, Syrejschikova, N V, Smolina   +2 more
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Steric effect on fluorescence quenching

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2005
In this communication we have reported the steric effect on the fluorescence quenching rate constants of the electron transfer (ET) process. We have done a comparative study using donor (D)-acceptor (A) systems with different exergonicity (-deltaG(f)). Different carbazole derivatives (CZ): 1,4-dicyanobenzene (DCB) systems (-deltaG(f) = 0.7-0.8 eV) were
Suchandra, Chatterjee, Samita, Basu, Nandita, Ghosh, Manas, Chakrabarty   +3 more
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Fluorescence Anisotropy Controlled by Light Quenching

Photochemistry and Photobiology, 1998
We demonstrated that fluorescence anisotropy can be effectively decreased or increased in the presence of light quenching, depending on relative polarizations of excitation and quenching pulses. For parallel light quenching, anisotropy decreases to 0.103 and z-axis symmetry is preserved.
I, Gryczynski, Z, Gryczynski, J R, Lakowicz   +2 more
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Magnetic quenching of fluorescence

Chemical Physics Letters, 1977
Abstract The direct and indirect mechanisms for the magnetic enhancement of radiationless decay processes are described, and used to account for the experimental observations of the magnetic quenching of fluorescence from carbon disulphide, glyoxal, and nitrogen dioxide.
P.W. Atkins, Paul.R. Stannard
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Fluorescence quenching in Nd:YAG

Applied physics, 1973
We show that quenching of the Nd fluorescence is in principle not associated with the Nd3+ ion but with the host. The process is due to near-field electric dipole interaction between Nd pairs, and cross relaxation via the4I1 5/2 manifold. We present for the first time the complete fluorescence spectrum and level scheme of Nd∶YAG, and find that Nd∶YAG ...
H. G. Danielmeyer, M. Blätte, P. Balmer
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Quenching of NO2 Fluorescence

The Journal of Chemical Physics, 1966
Quenching constants for NO2 fluorescence were obtained for 13 different inert gases. Quenching cross sections range from 1/25 to 1/2 of gas kinetic and increase with increasing molecular complexity, and dipole moment. No unusual resonance effect for quenching by ground-state NO2 was found.
G. H. Myers, D. M. Silver, F. Kaufman
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Fluorescence Quenching by Redox Molecular Pumping

Journal of the American Chemical Society, 2022
Artificial molecular pumps (AMPs), inspired by the active cellular transport exhibited in biological systems, enable cargoes to undergo unidirectional motion, courtesy of molecular ratchet mechanisms in the presence of energy sources. Significant progress has been achieved, using alternatively radical interactions and Coulombic repulsive forces to ...
Li, Xuesong, David, Arthur H. G., Zhang, Long, Song, Bo, Jiao, Yang, Sluysmans, Damien, Qiu, Yunyan, Wu, Yong, Zhao, Xingang, Feng, Yuanning, Mosca, Lorenzo, Stoddart, J. Fraser   +11 more
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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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The quenching of anthracene fluorescence

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1951
Abstract 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.
Edmund John Bowen, W. S. Metcalf
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