Results 301 to 310 of about 215,411 (342)

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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Quenching of the Fluorescence of Aromatic Pterins by Deoxynucleotides

The Journal of Physical Chemistry A, 2009
Steady-state and time-resolved studies of the fluorescence of four aromatic unconjugated pterins (pterin (Ptr), 6-(hydroxymethyl)pterin (Hmp), 6-methylpterin (Mep), and 6,7-dimethylpterin (Dmp)) in aqueous solutions in the presence of different nucleotides (2'-deoxyguanosine 5'-monophosphate (dGMP), 2'-deoxyadenosine 5'-monophosphate (dAMP), and 2 ...
Gabriela, Petroselli, M Laura, Dántola, Franco M, Cabrerizo, Carolina, Lorente, André M, Braun, Esther, Oliveros, Andrés H, Thomas   +6 more
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Fluorescence quenching of 2-aminopurine in dinucleotides

Chemical Physics Letters, 2005
2-Aminopurine is a fluorescent base analog that probes local dynamics in DNA because its fluorescence is quenched by the surrounding bases. But, the underlying mechanisms are still under investigation. We have studied fluorescence decay of 2-aminopurine in dinucleotides and found a similar heterogeneity as was previously observed in larger ...
Somsen, O.J.G., van Hoek, A., van Amerongen, H.   +2 more
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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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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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Concentration Quenching of Fluorescence in Chlorophyll Solutions

Nature, 1948
IN a paper concerned chiefly with the results of measurements of the self-quenching of the fluorescence of solutions of aromatic hydrocarbons1, Weiss and Weil-Malherbe report a few measurements on the self-quenching of ethyl chlorophyllide solutions.
W F, WATSON, R, LIVINGSTON
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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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Quenching of Fluorescence in Solution

The Journal of Physical and Colloid Chemistry, 1948
G K, ROLLEFSON, H, BOAZ
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Fluorescence Quenching Reactions

1991
The quenching of the fluorescence of biomacromolecules by solute quenchers has become a widely used and powerful technique (Lehrer, 1976; Lehrer and Leavis, 1989; Lakowicz, 1983; Eftink and Ghiron, 1981; Eftink, 1991). Such quenching reactions have been used primarily to obtain topographical information about proteins, nucleic acids, and membrane ...
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Concentration Quenching of Nd^3+ Fluorescence

Applied Optics, 1968
Concentration quenching of the 1.06-micro Nd(3+) fluorescence in glass is investigated to help determine the nature of the Nd(3+)-Nd(3+) interaction that causes quenching. The relative fluorescent efficiency vs Nd(3+) concentration is measured for thin, polished plates of glass in an apparatus designed to minimize instrumental distortion of the ...
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