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Articles 1 - 3 of 3
Full-Text Articles in Physics
Bridging The 12-6-4 Model And The Fluctuating Charge Model, Pengfei Li
Bridging The 12-6-4 Model And The Fluctuating Charge Model, Pengfei Li
Chemistry: Faculty Publications and Other Works
Metal ions play important roles in various biological systems. Molecular dynamics (MD) using classical force field has become a popular research tool to study biological systems at the atomic level. However, meaningful MD simulations require reliable models and parameters. Previously we showed that the 12-6 Lennard-Jones nonbonded model for ions could not reproduce the experimental hydration free energy (HFE) and ion-oxygen distance (IOD) values simultaneously when ion has a charge of +2 or higher. We discussed that this deficiency arises from the overlook of the ion-induced dipole interaction in the 12-6 model, and this term is proportional to 1/r …
Somatic Inhibition By Microscopic Magnetic Stimulation, Hui Ye
Somatic Inhibition By Microscopic Magnetic Stimulation, Hui Ye
Biology: Faculty Publications and Other Works
Electric currents can produce quick, reversible control of neural activity. Externally applied electric currents have been used in inhibiting certain ganglion cells in clinical practices. Via electromagnetic induction, a miniature-sized magnetic coil could provide focal stimulation to the ganglion neurons. Here we report that high-frequency stimulation with the miniature coil could reversibly block ganglion cell activity in marine mollusk Aplysia californica, regardless the firing frequency of the neurons, or concentration of potassium ions around the ganglion neurons. Presence of the ganglion sheath has minimal impact on the inhibitory effects of the coil. The inhibitory effect was local to the …
Universal Flow Equations And Chaos Bound Saturation In 2d Dilaton Gravity, D. Grumiller, Robert Mcnees
Universal Flow Equations And Chaos Bound Saturation In 2d Dilaton Gravity, D. Grumiller, Robert Mcnees
Physics: Faculty Publications and Other Works
We show that several features of the Jackiw-Teitelboim model are in fact universal properties of two-dimensional Maxwell-dilaton gravity theories with a broad class of asymptotics. These theories satisfy a flow equation with the structure of a dimensionally reduced T ¯ T deformation, and exhibit chaotic behavior signaled by a maximal Lyapunov exponent. One consequence of our results is a no-go theorem for smooth flows from an asymptotically AdS2 region to a de Sitter fixed point.