Results 231 to 240 of about 98,065 (290)
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Fluorescence Quenching in Membrane Phase
Biochemical and Biophysical Research Communications, 1995Membrane-related events can be investigated when the fluorescence of an intramembrane fluorophore is quenched by molecules that are dissolved in lipid phase. In this case the bimolecular quenching constant characterises the relative transport rate of the fluorophore and quencher molecules in the membrane interior and thereby it is related to the ...
Z. Lakos, A. Szarka, Béla Somogyi
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Quenching of chlorophyll fluorescence by quinones
IUBMB Life, 1998AbstractQuinones caused quenching of Chl a fluorescence in native and model systems. Menadione quenched twofold the fluorescence of Chl a and BChl a in pea chloroplasts, chromatophores of purple bacteria, and liposomes at concentrations of 50‐80 μM. To obtain twofold quenching in Triton X‐100 micelles and in ethanol, the addition of 1.3 mM and 11 mM ...
A V Kitashov +4 more
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Fluorescence quenching of tryptophan by trifluoroacetamide
Biochimica et Biophysica Acta (BBA) - General Subjects, 1984Trifluoroacetamide was found to be a good quencher of tryptophan fluorescence, and the quenching was shown to proceed via both a dynamic and a static process. The respective quenching constants were determined by the measurement of the decrease of the fluorescence lifetime in the presence of the quencher.
Jean-Claude Auchet +3 more
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The quenching of anthracene fluorescence
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1951The 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.
W. S. Metcalf, Edmund John Bowen
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Fluorescence quenching of acridines by strandin
Archives of Biochemistry and Biophysics, 1961Abstract The interaction of four acridine compounds with strandin has been studied, with special attention being directed to acriflavine. In all cases fluorescence quenching by strandin occurs, the nature of the quenching curve depending on the dye involved.
Sheila K. Weintraub +2 more
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Fluorescence quenching studies with proteins
Analytical Biochemistry, 1981Abstract 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 ...
Camillo A. Ghiron +3 more
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Steric effect on fluorescence quenching
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2005In 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
Nandita Ghosh +3 more
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On mechanisms of fluorescence quenching by water
Biophysics, 2014Mechanisms 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.
T. I. Syrejschikova +2 more
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Chlorophyll fluorescence quenching by xanthophylls [PDF]
Physical Chemistry Chemical Physics, 2003 The interactions of the xanthophylls zeaxanthin, antheraxanthin and violaxanthin with chlorophyll, which are relevant for the chlorophyll fluorescence quenching in the non-photochemical quenching (NPQ) process in green plants, are investigated by means of quantum chemical methods.
Andreas Dreuw +2 more
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Fluorescence Anisotropy Controlled by Light Quenching
Photochemistry and Photobiology, 1998We 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.
Joseph R. Lakowicz +2 more
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