Results 301 to 310 of about 215,408 (348)

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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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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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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Diffusional Fluorescence Quenching of Aromatic Hydrocarbons

Applied Spectroscopy, 2003
The quenching of the fluorescence of five aromatic hydrocarbons by three halogenated organics and by molecular oxygen has been measured. Both fluorescence intensity and fluorescence lifetime measurements have been employed to validate results and interpretation; linear Stern–Volmer analyses are shown to apply throughout.
Clelia, Canuel, Sophie, Badre, Henning, Groenzin, Markus, Berheide, Oliver C, Mullins   +4 more
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Determination of carbazochrome by fluorescence quenching method

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2012
A sensitive, simple and selective spectrofluorimetric method for the reaction of carbazochrome (CBZC) and Eosin Y (EY) or Phloxine B (PB) in acidic medium is developed for the determination of carbazochrome in biological fluids, which gives a highly fluorescent derivative measured at 545 and 565 nm at excitation wavelengths of 301 and 305 nm.
Xiaojuan, Gan, Shaopu, Liu, Zhongfang, Liu, Xiaoli, Hu, Zhiping, Cui, Yaqiong, Wang   +5 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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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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