Dimethylsulphide (DMS) photo-oxidation and dimethylsulphoxide (DMSO) photoproduction were estimated in 26 laboratory irradiations of coastal samples from NE England (Tyne estuary) and W Scotland (Loch Linnhe and River Nant at Taynuilt). Pseudo-first order rate constants of DMS photo-oxidation (0.038 h-1 to 0.345 h-1) and DMSO photo-production (0.017 h-1 to 0.283 h-1) varied by one order of magn...

We report a new approach for the detection of mitochondrial flavins through photo-oxidation of a probe molecule. Probe 1 showed high brightness (ε × Φf = 6.50 × 103 M-1 cm-1) at long wavelengths (maximum emission wavelength, λmax = 600 nm) upon photo-oxidation, assisted by the strong electron accepting ability of the isoalloxazine moiety in flavins. Probe 1 also exhibited high selectivity for f...

Photo-oxidation of densely packed monolayer of CdSe quantum dots ~QDs! was studied by time-resolved photoluminescence ~PL! spectroscopy. Electrons yielded in QDs by the strong laser-pulse irradiation can assist the oxidation of CdSe QDs. Such rapid photo-oxidation does not introduce more nonradiative defects, instead, it enhances the coupling between QDs through surface modification and the PL ...

Secondary organic aerosol (SOA) is well-known to have adverse effects on air quality and human health. However, the dynamic mechanisms occurring during SOA formation and evolution are poorly understood. The time-resolved SOA composition formed during the photo-oxidation of three aromatic compounds, methyl chavicol, toluene and 4-methyl catechol, were investigated at the European Photoreactor. S...

We study photo-induced static and dynamic spectral changes in self-assembled CdSe=ZnS quantum dot (QD) thin films with varying QD concentrations under ambient conditions. Using spatially resolved scanning photoluminescence microscopy in conjunction with spectrally resolved time-correlated photon counting, we measure the variations in spectral intensity, emission wavelength, and recombination li...

Measurements of photo-oxidation products from the reaction of a series of alkyl-benzenes with hydroxyl radicals during EXACT using comprehensive gas chromatography J. F. Hamilton, A. C. Lewis, C. Bloss, V. Wagner, A. P. Henderson, B. T. Golding, K. Wirtz, M. Martin-Reviejo, and M. J. Pilling University of Leeds, Department of Chemistry, Woodhouse Lane, Leeds, LS2 9JT, UK University of York, Dep...

results it was found that in all studied wavelengths with or without methylene blue (mb), the level of all studied enzymes decreased remarkably when compared to dark controls. it was observed that the synthesis level of sod, glutathione peroxidase gp, and glucose 6 phosphate dehydrogenase g-6-pd in e. coli decreased significantly in red light with respect to white, blue, and green light in seaw...

Laser Raman spectra, UV-visible spectra, and photo-catalytic activity measurements are described which show that supported MoO,iTiOr catalysts prepared by impregnation possess a layer of surface molybdate species coordinated to the titania support. The saturation coverage of this surface molybdate monolayer corresponds to a surface density of ca. 4 x lOI MO atoms per cm2 of TiO*. The properties...