Results 31 to 40 of about 166,453 (383)

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

Beilstein 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, Manabu Abe, Yoshinobu Nishimura, Shoji Ishizaka, Masashi Namba, Taku Nakashima, Kiyofumi Shimoji, Noboru Hattori   +7 more
doaj   +1 more source

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

Beilstein 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, Denis V. Korchagin, Patrik Neuhaus, Wolfram Sander   +3 more
doaj   +1 more source

The Atmospheric Chemistry of GJ 1214b: Photochemistry and Clouds [PDF]

, 2011
Recent observations of the transiting super-Earth GJ 1214b reveal that its atmosphere may be hydrogen-rich or water-rich in nature, with clouds or hazes potentially affecting its transmission spectrum in the optical and very-near-IR.
Asplund, Batalha, Berta, Borucki, Cooper, Croll, Dobbs-Dixon, Désert, Eliza Miller-Ricci Kempton, Fortney, Fortney, Fortney, Freedman, Hauschildt, Hubbard, Jonathan J. Fortney, Kevin Zahnle, Kundurthy, Liang, Line, Lodders, Madhusudhan, Madhusudhan, Miller-Ricci, Miller-Ricci, Moses, Nettelmann, Rauscher, Rogers, Seager, Seager, Shabram, Showman, Swain, Swain, Visscher, Zahnle, Zahnle   +37 more
core   +1 more source

Optical Absorptivity versus Molecular Composition of Model Organic Aerosol Matter [PDF]

, 2009
Aerosol particles affect the Earth’s energy balance by absorbing and scattering radiation according to their chemical composition, size, and shape. It is generally believed that their optical properties could be deduced from the molecular composition of ...
Colussi, A. J., Guzmán, Marcelo I., Hoffmann, Michael R., Rincón, Angela G.   +3 more
core   +2 more sources

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

South 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

The Role of Reactive Nitrogen Species in Sensitized Photolysis of Wastewater-Derived Trace Organic Contaminants.

Environmental Science and Technology, 2019
Under conditions typically encountered in the aquatic environment, the absorption of sunlight by nitrite and nitrate leads to the transformation of trace organic contaminants.
Rachel C. Scholes, C. Prasse, D. Sedlak
semanticscholar   +1 more source

Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation

ChemEngineering, 2023
Dissolved inorganic nitrogen (DIN) species are key components of the nitrogen cycle and are the main nitrogen pollutants in groundwater. This study investigated the interconversion and removal of the principal DIN compounds (NO3−, NO2− and NH4+) via UV ...
Alejandro M. Senn, Natalia Quici
doaj   +1 more source

Heterogeneous Oxidation of SO2 in Sulfate Production During Nitrate Photolysis at 300 nm: Effect of pH, Relative Humidity, Irradiation Intensity, and the Presence of Organic Compounds.

Environmental Science and Technology, 2019
Heterogeneous oxidation of SO2 is one of the promising mechanisms to account for high loading of sulfate during severe haze periods in China. Our earlier work reported the SO2 oxidation by OH and NO2 produced during nitrate photolysis ( Environ.
Masao Gen, Ruifeng Zhang, D. Huang, Y. Li, C. Chan   +4 more
semanticscholar   +1 more source

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

Toxics
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

Photochemical transformation of perfluoroalkyl acid precursors in water using engineered nanomaterials [PDF]

, 2020
The production of perfluoroalkyl acids (PFAAs) has been phased out over recent decades; however, no significant decline in their environmental concentrations has been observed.
Dai, Yunrong, Guo, Xingxing, Hoffmann, Michael R., Wang, Siyu, Yin, Lifeng   +4 more
core