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Exploring the nature of stuttering through a behavioral-neuro-modulation intervention program in bilinguals with stuttering.
Codas
January 2025
Department of Speech and Hearing, Manipal College of Health Professions, Manipal Academy of Higher Education, Manipal, Karnataka, India.
Purpose: Investigations on identifying the nature of stuttering present varying views. The argument remains whether the stuttering dysfluencies have a motor or a linguistic foundation. Though stuttering is considered a speech-motor disorder, linguistic factors are increasingly reported to play a role in stuttering.
View Article and Find Full Text PDFStrong precursor softening in cubic CaSiO perovskite.
Proc Natl Acad Sci U S A
February 2025
Department of Earth Sciences, University College London, London WC1E 6BT, United Kingdom.
CaSiO[Formula: see text] perovskite (CaPv) is the last major mineral in the Earth's lower mantle whose elasticity remains largely unresolved. Here, we investigate the elasticity of CaPv using ab initio machine-learning force fields (MLFF). At room temperature, the elasticity of tetragonal CaPv determined by MLFF molecular dynamics (MD) agrees well with experimental measurements after considering temperature induced variations in the hydrostatic structure, proving the effectiveness of the method.
View Article and Find Full Text PDFRegulatory issues surrounding the management of selenium-introduction to a special series of papers.
Integr Environ Assess Manag
January 2025
International Institute for Sustainable Development-Experimental Lakes Area, Winnipeg, Manitoba, Canada.
Selenium (Se) is a naturally occurring metalloid in soils and rocks that is released by weathering processes; it is also enriched by some anthropogenic activities, including mining and agriculture. The mechanism of Se aquatic toxicity has been understood for several decades; at elevated concentrations, dietary Se can accumulate in maternal tissues of fish and birds, become deposited into their eggs, and can potentially result in impaired embryological development. North American environmental regulations have acknowledged differences in species sensitivity and variation among aquatic environments (i.
View Article and Find Full Text PDFElectronically Nonadiabatic Quenching of Excited States of O by Collisions with O Atoms.
J Phys Chem A
January 2025
Department of Chemistry and Chemical Biology, Center for Computational Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, United States.
The kinetics of electronically inelastic quenching of O(Δ) and O(Σ) by collisions with O(P) have been investigated using mixed quantum-classical trajectories governed by adiabatic potential energy surfaces and state couplings generated from a recently developed diabatic potential energy matrix (DPEM) for the 14 lowest-energy A' states of O. Using the coherent switching with decay of mixing (CSDM) method, dynamics calculations were performed both with 14 coupled electronic states and with 8 coupled electronical states, and similar results were obtained. The calculated thermal quenching rate coefficients are generally small, but they increase with temperature.
View Article and Find Full Text PDFInteger Topological Defects Reveal Antisymmetric Forces in Active Nematics.
Phys Rev Lett
December 2024
Shanghai Jiao Tong University, School of Physics and Astronomy, Institute of Natural Sciences, Shanghai 200240, China.
Article Synopsis
- Researchers categorize cell layers as either contractile or extensile active nematics, but recent experiments with neural progenitor cells and +1 topological defects challenge this classification.
- The study involves a particle-level model and a continuum theory, both of which reveal that cells accumulate at the core of +1 defects, aligning with the main experimental outcome.
- The cell accumulation is driven by two overlooked antisymmetric active forces, and the findings have implications for understanding other active nematics experiments and existing theories.
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