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Gruen, Henry,Gorner, Helmut Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.8
The radical-induced reduction of 16,17-dihydroxy- ($M1O_2$) and 16,17-dimethoxyviolanthrone ($M2O_2$) in argon-saturated 1-phenylethanol or mixtures of dimethyl sulfoxide and acetonitrile or glycerol triacetate was studied by photochemical methods. The photoproduct of $MiO_2$ (i = 1, 2) in the presence of a sensitizer, such as acetone, acetophenone or benzophenone, and a donor, e.g. an alcohol or triethylamine, is the fluorescing dihydroquinone, Mi$(OH)_2$ which undergoes back-oxidation. Flash photolysis reveals ketyl radicals after the pulse and indicates radical formation in the 1 ms range en route to $Mi(OH)_2$, while the putative donor and semiquinone radicals are undetectable intermediates. The concentrations of quinonoid dyes and donors were varied to explore the phenomena and to provide data for a mechanistic interpretation.
Dimer-promoted fluorescence quenching of coralyne by binding to anionic polysaccharides
Megyesi, Monika,Biczok, Laszlo,Gorner, Helmut Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.4
The effects of anionic chondroitin or dextran sulfates on the absorption and fluorescence properties of coralyne, a cationic benzo[c]phenanthridine type alkaloid, were studied in aqueous solution. The remarkably strong binding to both polysaccharides promotes the coralyne dimer formation, which was evidenced by the changes in the absorption and fluorescence spectra and the fluorescence decay. The extent of dimerization, induced by chondroitin, shows a significant pH dependence because the competitive protonation of the carboxylate moieties of the polymer chain decreases the number of binding sites. A larger molecular weight of dextran sulfate stabilizes the coralyne dimer more efficiently.