Results 91 to 100 of about 427,861 (368)

On rigid derivations in rings

Karpatsʹkì Matematičnì Publìkacìï, 2014
We prove that in a ring $R$ with an identity there exists an element $a\in R$ and a nonzero derivation $d\in Der R$ such that $ad(a)\neq 0$. A ring $R$ is said to be a $d$-rigid ring for some derivation $d \in Der R$ if  $d(a)=0$ or $ad(a)\neq 0$ for all
O.D. Artemovych, M.P. Lukashenko
doaj   +1 more source

Reinvestigation of the Deceptively Simple Reaction of Toluene with OH and the Fate of the Benzyl Radical: The “Hidden” Routes to Cresols and Benzaldehyde

Journal of Physical Chemistry A, 2020
In a previous work, we have investigated the initial steps of the reaction of toluene with the hydroxyl radical using several quantum chemical approaches including density functional and composite post-Hartree–Fock models.
Zoi Salta, A. Kosmas, Marc E. Segovia, M. Kieninger, N. Tasinato, V. Barone, O. Ventura   +6 more
semanticscholar   +1 more source

In vivo evidence for glycyl radical insertion into a catalytically inactive variant of pyruvate formate‐lyase

FEBS Letters, EarlyView.
Dimeric pyruvate formate‐lyase cleaves pyruvate using a radical‐based mechanism. G734 serves as a radical storage location, and the radical is transferred to the catalytic C419 residue. Mutation of the C418‐C419 pair causes loss of enzyme activity, but does not impede radical introduction onto G734. Therefore, cis‐ but not trans‐radical transfer occurs
Michelle Kammel, A. F. Volker Wagner, R. Gary Sawers   +2 more
wiley   +1 more source

Bioisosteric modification on melatonin: synthesis of new naphthalene derivatives, in vitro antioxidant activity and cytotoxicity studies

Brazilian Journal of Pharmaceutical Sciences, 2020
Melatonin (MLT) is a strong free radical scavenger that protects the body from the deleterious effects of excess oxidants. Synthesis of MLT analogue compounds with antioxidant potency has recently attracted the interest of researchers.
Hanif Shirinzadeh, Mohammed Ghalia, Alev Tascioglu, Ferial Intissar Adjali, Gulsen Gunesacar, Hande Gurer-Orhan, Sibel Suzen   +6 more
doaj   +1 more source

Ring-Cleavage Products Produced during the Initial Phase of Oxidative Treatment of Alkyl-Substituted Aromatic Compounds.

Environmental Science and Technology, 2020
Chemical oxidation with hydroxyl radical (HO•) and sulfate radical (SO4•-) is often used to treat water contaminated with aromatic compounds. Although oxidation of aromatics by these radicals has been studied for decades, the commonly accepted ...
J. Van Buren, C. Prasse, Emily L. Marron, Brighton A Skeel, D. Sedlak   +4 more
semanticscholar   +1 more source

P‐glycoprotein modulates the fluidity gradient of the plasma membrane of multidrug resistant CHO cells

FEBS Letters, EarlyView.
To explore the impact of the overexpression of the multidrug‐transporter P‐glycoprotein (ABCB1) on membrane fluidity, we compared the transversal gradient of mobility and microviscosity in plasma membranes of drug‐sensitive Chinese hamster ovary cells (AuxB1) and their multidrug‐resistant derivatives (B30) using the fluorescent n‐(9‐anthroyloxy) fatty ...
Roger Busche, John R. Riordan, Burkhard Tümmler   +2 more
wiley   +1 more source

On the complexity of radicals in noncommutative rings [PDF]

Journal of Algebra, 2009
AbstractThis article expands upon the recent work by Downey et al. (2007) [3], who classified the complexity of the nilradical and Jacobson radical of commutative rings in terms of the arithmetical hierarchy.Let R be a computable (not necessarily commutative) ring with identity.
openaire   +1 more source

Evolutionary interplay between viruses and R‐loops

FEBS Letters, EarlyView.
Viruses interact with specialized nucleic acid structures called R‐loops to influence host transcription, epigenetic states, latency, and immune evasion. This Perspective examines the roles of R‐loops in viral replication, integration, and silencing, and how viruses co‐opt or avoid these structures.
Zsolt Karányi, Zita Képes, Zoltán Szabó, Eszter Csoma, Lóránt Székvölgyi   +4 more
wiley   +1 more source

Mechanistic study of the formation of ring-retaining and ring-opening products from the oxidation of aromatic compounds under urban atmospheric conditions.

Atmospheric Chemistry and Physics, 2019
Aromatic hydrocarbons make up a large fraction of anthropogenic volatile organic compounds and contribute significantly to the production of tropospheric ozone and secondary organic aerosol (SOA).
Alexander Zaytsev, A. Koss, M. Breitenlechner, J. Krechmer, Kevin J. Nihill, C. Lim, James C. Rowe, Joshua L. Cox, J. Moss, J. Roscioli, M. Canagaratna, D. Worsnop, J. Kroll, F. Keutsch   +13 more
semanticscholar   +1 more source

Delocalization of the Unpaired Electron in the Quercetin Radical: Comparison of Experimental ESR Data with DFT Calculations

International Journal of Molecular Sciences, 2020
In the antioxidant activity of quercetin (Q), stabilization of the energy in the quercetin radical (Q•) by delocalization of the unpaired electron (UE) in Q• is pivotal.
Zhengwen Li, Mohamed Moalin, Ming Zhang, L. Vervoort, A. Mommers, G. Haenen   +5 more
semanticscholar   +1 more source