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Conditions on the pion electroproduction and photoproduction form factors in the soft-pion limit
(American Physical Society, 2020-05)
Using the Bernard-Kaiser-Lee-Meissner (BKLM) parametrization of the hadronic vertex γ∗N → πN, with γ being a virtual photon, we analyze the restrictions imposed on the form factors (FF) in the limit at which the pion ...
Mechanistic analysis on the photochemistry of the anti-inflammatory drug etoricoxib in aqueous solution. Cytotoxicity of photoproducts
(Elsevier Science Sa, 2020-03)
Photophysical and photochemical properties of the non-steroidal anti-inflammatory drug Etoricoxib was analyzing in aqueous media at different pH values. The mechanistic and kinetic aspects of the photodegradation processes ...
Clearing up the photochemistry of resveratrol: Effect of the solvent
(Elsevier Science Sa, 2018-12)
Polyphenolic substances synthesized by plants are generally involved in protection against UV radiation and the attack of pathogenic microorganisms. Resveratrol (3,5,4′-trihydroxystilbene, RSV) is synthesized in its ...
Photosensitized oxidation of 2′-deoxyguanosine 5′-monophosphate: Mechanism of the competitive reactions and product characterization
(Royal Society of Chemistry, 2017-06)
UV-A radiation (320-400 nm) induces modifications to different biomolecules through photosensitized reactions. Oxidized pterins are efficient photosensitizers that accumulate in the skin affected by vitiligo, and photoinduce ...
Photochemical study of the highly used corticosteroids dexamethasone and prednisone: Effects of micellar confinement and cytotoxicity analysis of photoproducts
(Royal Society of Chemistry, 2020-11-14)
In order to investigate the effect of solar UV light on pharmacological compounds considered as emerging environmental pollutants, we studied the kinetic, mechanistic and toxicological aspects of the direct photolysis of ...
Photo-Fries rearrangement of aryl acetamides: regioselectivity induced by the aqueous micellar green environment
(Royal Society of Chemistry, 2016-01)
Photochemical reactions tend to give more than one photoproduct. However, such a reaction can be a powerful synthetic tool when it is possible to conduct it in regioselective conditions yielding a single photoproduct. ...
Substituent effects on the photolysis of methyl 2-carboxylate substituted aliphatic 2H-azirines
(Elsevier Science, 2007-05)
In this study, the UV induced photochemical reactions of two 2H-azirines – methyl 2-chloro-3-methyl-2H-azirine-2-carboxylate (MCMAC) and methyl 3-methyl-2H-azirine-2-carboxylate (MMAC) – isolated in argon matrices are ...
Natural levels of hydrogen peroxide (H2O2) in deep clear South temperate lakes: Field and laboratory evidence of photo- and biotic production
(Elsevier, 2020-07)
Hydrogen peroxide (H2O2) is a ubiquitous reactive oxygen species (ROS) in aquatic systems and is produced mainly in surface water by the interaction of ultraviolet radiation (UVR) and natural dissolved organic carbon (DOC). ...
Natural levels and photo-production rates of hydrogen peroxide (H2O2) in Andean Patagonian aquatic systems: Influence of the dissolved organic matter pool
(Pergamon-Elsevier Science Ltd, 2019-02)
In aquatic environments the reactive oxygen species hydrogen peroxide (H2O2) is produced through photochemical reactions involving chromophoric dissolved organic matter (CDOM). Andean Patagonian freshwaters experience ...
Light-induced full aromatization and hydroxylation of 7-methoxy-1-methyl-3,4-dihydro-2H-pyrido[3,4-b]indole alkaloid: Oxygen partial pressure as a key modulator of the photoproducts distribution
(Elsevier Science SA, 2019-10)
Full-aromatic and partially hydrogenated β-carboline (βC) derivatives constitute a group of alkaloids widely distributed in a great variety of living systems. In plants and bacteria, tetrahydro-βCs are the primary product ...