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Matches in SemOpenAlex for { <https://semopenalex.org/work/W1987243389> ?p ?o ?g. }

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• W1987243389 abstract "This study was directed to examine the role of type II (photodynamic) reactions involving the production of reactive oxygen species (singlet oxygen, superoxide anion, and hydroxy radicals) in in vitro and in vivo photosensitization reactions induced by skin photosensitizing chemicals. Several porphyrins and psoralens, as model compounds representing examples of endogenous and exogenous photosensitizers, were examined for their ability to (a) produce singlet oxygen and superoxide anions, (b) induce damage to membranes and associated microsomal P-450, (c) promote lipid peroxidation of microsomal lipids of liver and epidermal cells, and (d) induce skin photosensitization reactions in vivo. Dose-response study in vitro of singlet oxygen production in H2O and D2O and inhibition studies involving the production of singlet oxygen and superoxide anion by specific quenchers indicated significant production of singlet oxygen by porphyrins, about 5-20 times higher than psoralen at 10(-5) M and 10(-6) M concentration and irradiation dose of 1-5 J/cm2 of UVA (greater than 320-400 nm radiation). The comparative studies on aerobic photodegradation of microsomal P-450 of guinea pig epidermis and liver indicated a significantly greater destruction of P-450 with porphyrins than with psoralens. A membrane-lipid peroxidation study involving malondialdehyde production, using liver and epidermal microsomal fractions with and without porphyrins, psoralens, and UVA radiation, indicated 10-20 times increased production of malondialdehyde with UVA and porphyrins than with psoralens." @default.
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• W1987243389 date "1988-03-01" @default.
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• W1987243389 title "Studies on the Nature of In Vitro and In Vivo Photosensitization Reactions By Psoralens and Porphyrins" @default.
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• W1987243389 doi "https://doi.org/10.1111/1523-1747.ep12455986" @default.
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