Results 111 to 120 of about 668,221 (156)
Some of the next articles are maybe not open access.
FLUORESCENCE QUENCHING IN PHENYLALANINE AND MODEL COMPOUNDS*
Photochemistry and Photobiology, 1972Abstract— 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
openaire +2 more sources
Quenching of tryptophan fluorescence by brominated phospholipid
Biochemistry, 1990Bromolipids [1-palmitoyl-2-(dibromostearoyl)phosphatidylcholine] with bromines at the 4,5-, 6,7-, 9,10-, 11,12-, and 15,16-positions were used to examine the fluorescence quenching of a synthetic, membrane-spanning peptide (Lys2-Gly-Leu8-Trp-Leu8-Lys-Ala-amide) incorporated into both small and large unilamellar vesicles. The peptide-lipid vesicles were
E J, Bolen, P W, Holloway
openaire +2 more sources
An internally quenched fluorescent substrate for collagenase
Peptide Science, 2008AbstractA synthetic collagenase substrate containing the internal peptide sequence—Gly‐Gly‐Pro‐Leu‐Gly‐Pro‐Pro‐Gly‐Pro—has been synthesized, with an N‐terminus 4‐((4‐(dimethylamino)phenyl)azo)‐benzoyl (DABCYL) group and C‐terminus 5‐[2‐(acetamido)ethylamino] naphthalene‐1‐sulfonic acid (AEDANS) moiety resulting in internal quenching of AEDANS ...
Saikumari, YK, Balaram, P
openaire +2 more sources
Quenching of the Fluorescence of Aromatic Pterins by Deoxynucleotides
The Journal of Physical Chemistry A, 2009Steady-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 +6 more
openaire +2 more sources
Fluorescence Quenching in a Perylenetetracarboxylic Diimide Trimer
Journal of the American Chemical Society, 2008A perylenetetracarboxylic diimide (PDI) trimer (3) linked by a triazine ring has been prepared. The UV-vis absorption spectra together with the (1)H NMR spectra revealed that two of the three PDI subunits in the trimer presents a face-to-face stacked configuration while the third one appended acts as a monomer.
Yanfeng, Wang +4 more
openaire +2 more sources
Apparent Concentration Quenching of Morphine Fluorescence
Science, 1963Fundamental fluorescence equations were examined. Deviations from the theoretical were observed by varying the light path length to determine effects on "apparent" fluorescence. It was found that the decrease in emission of morphine solutions with the increase in concentration was caused by absorption effects that prevented excitation of the whole ...
R, Brandt, M J, Olsen, N D, Cheronis
openaire +2 more sources
Concentration Quenching of Nd^3+ Fluorescence
Applied Optics, 1968Concentration 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 ...
openaire +2 more sources
Quenching of Fluorescence in Solution
The Journal of Physical and Colloid Chemistry, 1948G K, ROLLEFSON, H, BOAZ
openaire +2 more sources
Fluorescence Quenching Reactions
1991The 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 ...
openaire +1 more source
Fluorescence quenching of coumarins by halide ions
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2004Fluorescence quenching of 4-methyl-7-methoxy coumarin (1) and 4-methyl-5-ethoxy-7-methoxy coumarin (2) in aqueous solutions have been studied at different concentrations of halide ions (Cl-, Br-, I-), at room temperature approximately 20 degrees C. It is observed that the fluorescence intensity of both the coumarin compounds (1 and 2) decrease with ...
openaire +2 more sources