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Dynamic control of 2D non-Hermitian photonic corner skin modes in synthetic dimensions.
Nat Commun
December 2024
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD, USA.
Non-Hermitian models describe the physics of ubiquitous open systems with gain and loss. One intriguing aspect of non-Hermitian models is their inherent topology that can produce intriguing boundary phenomena like resilient higher-order topological insulators (HOTIs) and non-Hermitian skin effects (NHSE). Recently, time-multiplexed lattices in synthetic dimensions have emerged as a versatile platform for the investigation of these effects free of geometric restrictions.
View Article and Find Full Text PDFFacile and Regioselective Deuteration of C2-Alkylated Imidazolium Salts in the Presence of Cesium Carbonate.
Chemistry
December 2024
Université de Liège: Universite de Liege, Laboratory of Organometallic Chemistry and Homogeneous Catalysis, Institut de chimie B6a, Sart-Tilman, 4000, Liege, BELGIUM.
Thirteen imidazolium iodides bearing benzyl, mesityl, or 2,6-diiso-propyl-phenyl substituents on their nitrogen atoms, and C1 to C4 alkyl chains on their C2 carbon atom were readily deuterated with D2O as a cheap and non-toxic deuterium source in the presence of Cs2CO3, a weak, innocuous, inorganic base. The isotopic exchange proceeded quickly and efficiently under mild, aerobic conditions to afford a range of aNHC and NHO precursors regioselectively labeled on their C2α exocyclic position and/or C4=C5 heterocyclic backbone. A "carbene-free" mechanism was postulated, in which the carbonate anion acts as a catalyst to activate an exocyclic, acidic C-H bond and ease a deuterium transfer from D2O to the imidazolium salt in a concerted fashion.
View Article and Find Full Text PDFAssessing metal-induced glycation in French fries.
Metallomics
December 2024
Department of Environmental and Physical Sciences, Faculty of Science.
Non-enzymatic glycation is the chemical reaction between the amine group of an amino acid and the carbonyl group of a reducing sugar. The final products of this reaction, advanced glycation end-products (AGEs), are known to play a key role in aging and many chronic diseases. The kinetics of the AGE formation reaction depends on several factors, including pH, temperature, and the presence of prooxidant metals, such as iron and copper.
View Article and Find Full Text PDFPressure-improved Scott-Vogelius type elements.
Calcolo
December 2024
Institut für Mathematik, Universität Zürich, Winterthurerstr 190, 8057 Zürich, Switzerland.
The Scott-Vogelius element is a popular finite element for the discretization of the Stokes equations which enjoys inf-sup stability and gives divergence-free velocity approximations. However, it is well known that the convergence rates for the discrete pressure deteriorate in the presence of certain in a triangulation of the domain. Modifications of the Scott-Vogelius element such as the recently introduced pressure-wired Stokes element also suffer from this effect.
View Article and Find Full Text PDFMolecular identification of species from pneumonic goats, Iraq.
Open Vet J
November 2024
Department of Internal and Preventive Veterinary Medicine, College of Veterinary Medicine, University of Wasit, Wasit, Iraq.
Background: In goats, acute and chronic respiratory infections are often characterized by a rapidly progressing clinical course with little opportunity to develop an effective antibiotic therapy.
Aim: This study aimed to identify spp. in pneumonic goats, assess its antibiotic susceptibility, and confirm the molecular phylogenetics of spp.
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