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Light Radiation (light + radiation)
Selected AbstractsPhotocatalytic and Magnetic Properties of the Fe-TiO2/SnO2 Nanofiber Via ElectrospinningJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 3 2010Rui Zhang Fe-doped TiO2/0.03SnO2 hybrid nanofiber has been prepared via electrospinning method. The magnetic property versus Fe-doping content was characterized, and the corresponding photocatalytic activity under visible light radiation was evaluated by using Rhodamine B (RhB) degradation as a probe reaction. The hybrid nanofiber has proved to be an excellent visible light-excitable photocatalyst with much higher photocatalytic activity than undoped TiO2/SnO2 hybrid nanofibers. The magnetic properties have also been characterized for the Fe-TiO2/SnO2 nanofibers before and after annealing under vacuum atmosphere, and nanofibers shows obvious ferromagnetic property at room temperature as they were annealed. It is believed that this nanofiber may become a potential photocatalyst in environmental remediation. [source] Phototoxicity in Human Retinal Pigment Epithelial Cells Promoted by Hypericin, a Component of St. John's Wort,PHOTOCHEMISTRY & PHOTOBIOLOGY, Issue 3 2007Albert R. Wielgus ABSTRACT St. John's wort (SJW), an over-the-counter antidepressant, contains hypericin, which absorbs light in the UV and visible ranges. In vivo studies have determined that hypericin is phototoxic to skin and our previous in vitro studies with lens tissues have determined that it is potentially phototoxic to the human lens. To determine if hypericin might also be phototoxic to the human retina, we exposed human retinal pigment epithelial (hRPE) cells to 10,7 to 10,5 M hypericin. Fluorescence emission detected from the cells (,ex = 488 nm; ,em = 505 nm) confirmed hypericin uptake by human RPE. Neither hypericin exposure alone nor visible light exposure alone reduced cell viability. However when irradiated with 0.7 J cm,2 of visible light (, > 400 nm) there was loss of cell viability as measured by MTS and lactate dehydrogenase assays. The presence of hypericin in irradiated hRPE cells significantly changed the redox equilibrium of glutathione and a decrease in the activity of glutathione reductase. Increased lipid peroxidation as measured by the thiobarbituric acid reactive substances assay correlated to hypericin concentration in hRPE cells and visible light radiation. Thus, ingested SJW is potentially phototoxic to the retina and could contribute to retinal or early macular degeneration. [source] The case for solar light radiation being more significant than ambient temperature in producing lethal hyperthermic ergotism in cattleAUSTRALIAN VETERINARY JOURNAL, Issue 9 2000CA BOURKE First page of article [source] Preparation and recycling of aqueous two-phase systems with pH-sensitive amphiphilic terpolymer PADBBIOTECHNOLOGY PROGRESS, Issue 3 2009Ning Biao Abstract In this study, a novel pH-sensitive terpolymer PADB was synthesized by random terpolymerization of 2-(dimethylamino) ethyl methacrylate, acrylic acid, and butyl methacrylate. The terpolymer PADB could form aqueous two-phase systems (ATPS) with a light-sensitive terpolymer PNBC, which was synthesized in our laboratory, using n -isopropylacrylamide, n -butyl acrylate, chlorophyllin sodium copper salt as monomers. More than 97% of the PADB terpolymer could be recovered by adjusting the pH to isoelectric point (PI) 4.1. The terpolymer PNBC could be recovered by using light radiation at 488 nm, with recovery ratio of 98%. BSA and lysozyme were partitioned in the PNBC,PADB ATPS to examine this new system. It was found that the partition coefficient of BSA and lysozyme could reach 4.46 and 0.49 in the systems, respectively. © 2009 American Institute of Chemical Engineers Biotechnol. Prog., 2009 [source] | ||||||||||