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Understanding the Topology Freezing Temperature of Vitrimer-Like Materials through Complementary Structural and Rheological Analyses for Phase-Separated Network.
ACS Macro Lett
January 2025
Department of Life Science and Applied Chemistry, Graduated School of Engineering, Nagoya Institute of Technology, Gokiso-cho Showa-ku, Nagoya-city, Aichi 466-8555, Japan.
Vitrimers are sustainable cross-linked polymers characterized by an associative bond exchange mechanism within their network. A well-known feature of vitrimers is the Arrhenius dependence of the viscosity or relaxation time. Another important aspect is the existence of a topology-freezing temperature (), which represents a transition between the viscoelastic solid state and the malleable viscoelastic liquid state.
View Article and Find Full Text PDFThe ketamine chameleon: history, pharmacology, and the contested value of experience.
Expert Rev Clin Pharmacol
January 2025
Department of Psychiatry, McGill University, Montréal, Canada.
Introduction: Since its synthesis in 1962, ketamine has been widely used in diverse medical contexts, from anesthesia to treatment-resistant depression. However, interpretations of ketamine's subjective effects remain polarized. Biomedical frameworks typically construe the drug's experiential effects as dissociative or psychotomimetic, while psychedelic paradigms emphasize the potential therapeutic merits of these non-ordinary states.
View Article and Find Full Text PDFWhip-it Beyond Desserts: Causing Subacute Combined Degeneration - Case Report and Literature Review.
J Community Hosp Intern Med Perspect
January 2025
Internal Medicine Residency Program, Luminis Health Anne Arundel Medical Center, Annapolis, MD, USA.
Nitrous oxide (NO) has been increasingly used for recreational purposes due to its dissociative and euphoric properties. Exposure to NO results in the deactivation of in vivo vitamin B, leading to subsequent neurological sequelae due to vitamin B deficiency.7 Current management focuses on cessation of exposure and replacement therapy, yet patients may continue to suffer from permanent neurological damage.
View Article and Find Full Text PDFA primary rat neuron-astrocyte-microglia tri-culture model for studying mechanisms of neurotoxicity.
Front Toxicol
January 2025
Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA, United States.
Primary cell cultures from rodent brain are widely used to investigate molecular and cellular mechanisms of neurotoxicity. To date, however, it has been challenging to reliably culture endogenous microglia in dissociated mixed cultures. This is a significant limitation of most neural cell models given the growing awareness of the importance of interactions between neurons, astrocytes and microglia in defining responses to neurotoxic exposures.
View Article and Find Full Text PDFCarbon Doping in Small Lithium Clusters: Structural, Energetic, and Electronic Properties from Quantum Monte Carlo Calculations.
ACS Omega
January 2025
Instituto de Física, Universidade Federal de Goiás, Goiânia, Goiás 74001-970, Brazil.
We investigate the energetic and structural properties of small lithium clusters doped with a carbon atom using a combination of computational methods, including density functional theory (DFT), diffusion quantum Monte Carlo (DMC), and the Hartree-Fock (HF) approximation. We calculate the lowest energy structures, total ground-state energies, electron populations, binding energies, and dissociation energies as a function of cluster size. Our results show that carbon doping significantly enhances the stability of lithium clusters, increasing the magnitude of the binding energy by 0.
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