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Insights on the role of cryoprotectants in enhancing the properties of bioinks required for cryobioprinting of biological constructs.
J Mater Sci Mater Med
January 2025
Tissue Engineering & Additive Manufacturing (TEAM) Lab, Centre for Nanotechnology & Advanced Biomaterials (CeNTAB), ABCDE Innovation Centre, School of Chemical & Biotechnology (SCBT), SASTRA Deemed University, Thanjavur, 613401, India.
Preservation and long-term storage of readily available cell-laden tissue-engineered products are major challenges in expanding their applications in healthcare. In recent years, there has been increasing interest in the development of off-the-shelf tissue-engineered products using the cryobioprinting approach. Here, bioinks are incorporated with cryoprotective agents (CPAs) to allow the fabrication of cryopreservable tissue constructs.
View Article and Find Full Text PDFInverting Methanol Dehydrogenation Selectivity by Crowding Atomic Ni Species over α-MoC Catalysts.
Angew Chem Int Ed Engl
December 2024
Beijing National Laboratory for Molecular Sciences, N, ew Corner-Stone Science Laboratory, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
Metal carbides with earth-abundant elements are widely regarded as promising alternatives to noble metal catalysts. Although comparable catalytic performances have been observed for metal carbides in several types of reactions, precise control of reaction pathways on them remains a formidable challenge, partially due to strong adsorption of reactants or intermediates. In this study, we show that bimolecular dehydrogenation of methanol to methyl formate and H is kinetically favored on bare α-MoC catalysts, while monomolecular dehydrogenation to CO and H becomes the dominant pathway when α-MoC is decorated with crowding atomic Ni species.
View Article and Find Full Text PDFElectrochemical Oxidative Cascade Cyclization of Alkenyl Alcohols with External Nucleophiles to Access Amino- and Hydroxy-Functionalized -Heterocycles.
J Org Chem
January 2025
Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, School of Pharmacy, Zunyi Medical University, Zunyi 563003, P. R. China.
A convenient electrochemical oxidative cascade cyclization of alkenes equipped with pendant alcohols with general nucleophiles was developed. Using readily available diarylmethanimine and carboxylic acids as nucleophilic sources, a broad range of internal alkene and terminal alkene substrates could produce RCO- and ArCN-functionalized -heterocycles in moderate to high yields without the requirement for external oxidants and metals. These resulting products can subsequently be hydrolyzed to yield valuable NH- and OH-functionalized tetrahydrofurans and tetrahydropyranes under mild conditions.
View Article and Find Full Text PDFStereoview Images of Hydrogen-Bonded Quinoxalines with a Helical Axis; Pyrimidines and a Pyridazine That Form Extended Tapes.
Int J Mol Sci
November 2024
Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK.
Different supramolecular motifs are formed by the crystallisation of amino-substituted derivatives of quinoxaline, pyrimidine and pyridazine. These were made from the corresponding mono- or dichlorinated heterocycles by a nucleophilic displacement reaction. The pyridine-type nitrogen atoms activate the chlorine atoms because they can stabilise a negative charge, which forms when the amine attacks the ring.
View Article and Find Full Text PDFCase 331: Cardiac Sarcoidosis.
Radiology
November 2024
From the Department of Medicine, Division of Cardiology (M.U., U.S., M. Shotwell, M. Shetty, D.K.K.) and Department of Radiology (W.F., J.J.), University of Louisville School of Medicine, Rudd Heart & Lung Center, 201 Abraham Flexner Way, Ste 600, Louisville, KY 40202.
A 43-year-old male patient with no known past medical history presented to the emergency department with new-onset bitemporal headache, dizziness, and bilateral lower extremity weakness for 1 day. The patient denied chest pain, shortness of breath, cough, or recent exposure to sick individuals. He was not on any medications and denied alcohol or illicit drug use.
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