Results 271 to 280 of about 121,244 (316)

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 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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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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