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Evaluation of biofilm formation and carbapenem resistance in isolated from clinical samples at a rural hospital in western Uttar Pradesh.
J Family Med Prim Care
November 2024
Department of Surgery, UPUMS, Saifai, Etawah, Uttar Pradesh, India.
Introduction: commonly causes healthcare-associated infections and shows multidrug resistance. can produce biofilm. Carbapenem resistance in is due to the production of carbapenemases mainly.
View Article and Find Full Text PDFRole of Metal-Oxide Interfaces in Methanol Decomposition: Reaction of Methanol on CeO/Ag(111) Inverse Model Catalysts.
J Phys Chem Lett
November 2024
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, People's Republic of China.
Article Synopsis
- Metal-oxide interfaces are important for catalytic processes, especially in methanol reactions on the CeO/Ag(111) catalyst surfaces studied under ultrahigh vacuum (UHV) conditions.
- Scanning tunneling microscopy and other techniques revealed that submonolayer CeO films form a hexagonal lattice with fully oxidized cerium, while higher ceria coverages lead to multilayer formations.
- Methanol interacts with these surfaces to create methoxy groups, which can decompose into formate or formaldehyde, with the submonolayer CeO exhibiting significantly lower temperatures for methoxy dehydrogenation compared to multilayer structures, highlighting the unique catalytic properties of the CeO-Ag(111) interface.
Vacuum-ultraviolet irradiation of pyridine:acetylene ices relevant to Titan astrochemistry.
Phys Chem Chem Phys
October 2024
Department of Chemistry, University of Otago, Dunedin 9054, New Zealand.
Nitrogen-containing polycyclic aromatic hydrocarbons (NPAHs) are important molecules for astrochemistry and prebiotic chemistry, as their occurrence spans from interstellar molecular clouds to planetary systems. Their formation has been previously explored in gas phase experiments, but the role of solid-state chemical reactions in their formation under cryogenic conditions remains elusive. Here, we explore the formation of NPAHs through vacuum ultraviolet (VUV) irradiation of pyridine:acetylene ices in amorphous and co-crystalline phases, with the aim to simulate conditions relevant to the interstellar medium and Titan's atmosphere.
View Article and Find Full Text PDFFormation of Stable Radicals by Mechanochemistry and Their Application for Magic Angle Spinning Dynamic Nuclear Polarization Solid-State NMR Spectroscopy.
J Phys Chem A
May 2024
U.S. Department of Energy, Ames National Laboratory, Ames, Iowa, 50011, United States.
High-field magic angle spinning (MAS) dynamic nuclear polarization (DNP) is becoming a common technique for improving the sensitivity of solid-state nuclear magnetic resonance (SSNMR) by the hyperpolarization of nuclear spins. Recently, we have shown that gamma irradiation is capable of creating long-lived free radicals that are amenable to MAS DNP in quartz and a variety of organic solids. Here, we demonstrate that ball milling is able to generate millimolar concentrations of stable radical species in diverse materials such as polystyrene, cellulose, borosilicate glass, and fused quartz.
View Article and Find Full Text PDFCompeting itinerant and local spin interactions in kagome metal FeGe.
Nat Commun
March 2024
Department of Physics and Astronomy, Rice University, Houston, TX, 77005, USA.
The combination of a geometrically frustrated lattice, and similar energy scales between degrees of freedom endows two-dimensional Kagome metals with a rich array of quantum phases and renders them ideal for studying strong electron correlations and band topology. The Kagome metal, FeGe is a noted example of this, exhibiting A-type collinear antiferromagnetic (AFM) order at T ≈ 400 K, then establishes a charge density wave (CDW) phase coupled with AFM ordered moment below T ≈ 110 K, and finally forms a c-axis double cone AFM structure around T ≈ 60 K. Here we use neutron scattering to demonstrate the presence of gapless incommensurate spin excitations associated with the double cone AFM structure of FeGe at temperatures well above T and T that merge into gapped commensurate spin waves from the A-type AFM order.
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