Results 21 to 30 of about 49,559 (307)

Ultraviolet B (UVB) Photosensitivities of Tea Catechins and the Relevant Chemical Conversions

open access: yesMolecules, 2016
Ultraviolet B (UVB) photosensitivities of eight catechins were screened. In both water and ethanol, epicatechin (EC, 575 μM) and catechin (C, 575 μM) exhibited low photostabilities under 6 h UVB radiation with the generation of yellow photoproducts ...
Meng Shi   +5 more
doaj   +1 more source

Is either direct photolysis or photocatalysed H-shift of peroxyl radicals a competitive pathway in the troposphere?

open access: yesRoyal Society Open Science, 2020
Peroxyl radicals (RO[Formula: see text]) are key intermediates in atmospheric chemistry, with relatively long lifetimes compared to most other radical species.
Rashid R. Valiev, Theo Kurten
doaj   +1 more source

A new photoremovable protecting group : synthesis and reaction mechanism [PDF]

open access: yes, 2006
A new photoremovable protecting group, allowing for irradiation up to 400 nm, is introduced. A simple synthetic route to three derivatives was described and their photochemistry in aqueous solutions and acetonitrile was investigated.
Kamdzhilov, Yavor
core   +1 more source

FEATURES OF DIAZO DYE PHOTODECOMPOSITION IN AQUEOUS SOLUTIONS CONTAINING ZINC, ALUMINUM AND ERBIUM SALTS [PDF]

open access: yesНаучно-технический вестник информационных технологий, механики и оптики, 2019
Subject of research.The features of diazo dye Chicago Sky Blue 6B photodecomposition in aqueous solutions containing the salts of zinc, aluminum and erbium were studied.
K. S. Evstropyev   +6 more
doaj   +1 more source

Photochemical generation of the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical from caged nitroxides by near-infrared two-photon irradiation and its cytocidal effect on lung cancer cells

open access: yesBeilstein Journal of Organic Chemistry, 2019
Novel caged nitroxides (nitroxide donors) with near-infrared two-photon (TP) responsive character, 2,2,6,6-tetramethyl-1-(1-(2-(4-nitrophenyl)benzofuran-6-yl)ethoxy)piperidine (2a) and its regioisomer 2b, were designed and synthesized. The one-photon (OP)
Ayato Yamada   +7 more
doaj   +1 more source

High-spin intermediates of the photolysis of 2,4,6-triazido-3-chloro-5-fluoropyridine

open access: yesBeilstein Journal of Organic Chemistry, 2013
In contrast to theoretical expectations, the photolysis of 2,4,6-triazido-3-chloro-5-fluoropyridine in argon at 5 K gives rise to EPR peaks of just two triplet mononitrenes, two quintet dinitrenes, and a septet trinitrene.
Sergei V. Chapyshev   +3 more
doaj   +1 more source

OH produced from o-nitrophenol photolysis: A combined experimental and theoretical investigation

open access: yes, 2009
Photodissociation dynamics of o-nitrophenol in the gas phase at different photolysis wavelengths (361-390 nm) is investigated, and the nascent OH radical is observed by the single-photon laser-induced fluorescence technique.
尹鸿鸣   +10 more
core   +2 more sources

Study on the Direct and Indirect Photolysis of Antibacterial Florfenicol in Water Using DFT/TDDFT Method and Comparison of Its Reactivity with Hydroxyl Radical under the Effect of Metal Ions

open access: yesToxics
Florfenicol (FLO) is a widely used antibacterial drug, which is often detected in the environment. In this paper, the photolysis mechanism of FLO in water was investigated using density functional theory (DFT) and time-dependent density functional theory
Yue Kang, Ying Lu, Se Wang
doaj   +1 more source

New light on vitamin B12: The adenosylcobalamin-dependent photoreceptor protein CarH

open access: yesSouth African Journal of Science, 2016
Adenosylcobalamin (AdoCbl), or coenzyme B12, is a cofactor for enzymes important in metabolism in humans (and other mammals) and bacteria. AdoCbl contains a Co-C bond and is extremely light sensitive, but, until recently, this light sensitivity appeared ...
Susan M. Chemaly
doaj   +1 more source

Hydrolysis and Photolysis of Neonicotinoid Insecticides

open access: yes, 2018
Excel spreadsheets containing concentration versus time data from experiments used to determine reaction rate constants for the pH-dependent hydrolysis reaction and direct photolysis reactions of neonicotinoid insecticides.Data for the hydrolysis of ...
Todey, Stephen A   +2 more
core   +1 more source

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