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QUANTUM YIELD OF SINGLET OXYGEN PRODUCTION BY XANTHENE DERIVATIVES
The singlet oxygen quantum yield (ϕ1o2) of 11 purified fluorescein derivatives was determined by reaction with singlet oxygen acceptors in aqueous and ethanolic solutions; in both solvents ϕ1o2 wasExpand
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Activation of human immunodeficiency virus type 1 by oxidative stress.
An important aspect of the infection by the human immunodeficiency virus (HIV-1) type 1 is its clinical latency, suggesting that the virus itself or the provirus may remain latent for extendedExpand
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ESR and optical absorption evidence for free radical involvement in the photosensitizing action of furocoumarin derivatives and for their singlet oxygen production.
Frozen aqueous solutions of thymine and its derivatives were irradiated with visible light (lambda greater than 320 nm) in the presence of various furocoumarins. ESR analysis revealed the inductionExpand
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MECHANISMS FOR DYE‐MEDIATED PHOTODYNAMIC ACTION: SINGLET OXYGEN PRODUCTION, DEOXYGUANOSINE OXIDATION AND PHAGE INACTIVATING EFFICIENCIES
Abstract The production of singlet oxygen (1O2) upon irradiation of several dyes in aqueous solution at pH 9.0, was quantitatively analyzed on the basis of the appearance of stable nitroxide radicalsExpand
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Phototoxicity of phenothiazine derivatives. II. Photosensitized cross-linking of erythrocyte membrane proteins.
Irradiation in the presence of O2, with near-UV light of five promazine (PZ) derivatives added to erythrocyte ghost membranes, causes covalent cross-linking between proteins as revealed by aExpand
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Destruction of stearic acid nitroxyl radicals mediated by photoexcited merocyanine 540 in liposomal and micellar systems.
Fatty acid spin labels have been included into liposomes and micelles, in order to study the photochemical behavior of merocyanine 540 toward nitroxyl radicals situated at various depths in theExpand
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Termini generated at the site of the DNA breakage mediated by photoexcited promazines.
Promazine derivatives are known to be able to photoinduce, in vitro, direct single-strand breaks into DNA (Decuyper et al., Biochem. Pharmac. 33, 4025-4031 (1984]. Using [32P]end labeled DNAExpand
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Singlet oxygen‐induced mutations in M13 lacZ phage DNA.
The mutagenic consequences of damages to M13 mp19 RF DNA produced by singlet oxygen have been determined in a forward mutational system capable of detecting all classes of mutagenic events. When theExpand
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On the nature of free radicals induced by X-rays in puric bases.
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Photodynamic activity of dyes with different DNA binding properties II. T4 phage inactivation.
The photosensitizing efficiency of six dyes--proflavine, 9-aminoacridine, ethidium bromide, thiopyronine, pyronine and acridine red--have been compared on the basis of the inactivation of sensitizedExpand
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