Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Alzheimer's disease (1)
- Atomistic molecular dynamics (1)
- BCS-BEC crossover (1)
- Bilayer thickness (1)
- Cholesterol (1)
-
- Diffusion (1)
- Fermionic superfluid (1)
- Glycoproteins (1)
- Hyperspherical (1)
- Hyperspherical coordinates (1)
- Interacting fermions (1)
- Length scale (1)
- Lipid bilayers (1)
- Lipid domains (1)
- Lipid order (1)
- Membrane disruption (1)
- Molecular dynamics (1)
- Nematic liquid crystals (1)
- Oligomers (1)
- Proteins (1)
- Quantum physics (1)
- Two-body scattering (1)
- Ultrasonics (1)
Articles 1 - 3 of 3
Full-Text Articles in Physics
The Hyperspherical Four-Fermion Problem, Seth T. Rittenhouse, J Von Stecher, J P. D'Incao, Nirav P. Mehta, Chris H. Greene
The Hyperspherical Four-Fermion Problem, Seth T. Rittenhouse, J Von Stecher, J P. D'Incao, Nirav P. Mehta, Chris H. Greene
Physics and Astronomy Faculty Research
The problem of a few interacting fermions in quantum physics has sparked intense interest, particularly in recent years owing to connections with the behaviour of superconductors, fermionic superfluids and finite nuclei. This review addresses recent developments in the theoretical description of four fermions having finite-range interactions, stressing insights that have emerged from a hyperspherical coordinate perspective. The subject is complicated, so we have included many detailed formulae that will hopefully make these methods accessible to others interested in using them. The universality regime, where the dominant length scale in the problem is the two-body scattering length, is particularly stressed, including …
Molecular Dynamics Simulations Reveal The Protective Role Of Cholesterol In Β-Amyloid Protein-Induced Membrane Disruptions In Neuronal Membrane Mimics, Liming Qiu, Creighton Buie, Andrew Reay, Mark W. Vaughn, Kwan H. Cheng
Molecular Dynamics Simulations Reveal The Protective Role Of Cholesterol In Β-Amyloid Protein-Induced Membrane Disruptions In Neuronal Membrane Mimics, Liming Qiu, Creighton Buie, Andrew Reay, Mark W. Vaughn, Kwan H. Cheng
Physics and Astronomy Faculty Research
Interactions of β-amyloid (Aβ) peptides with neuronal membranes have been associated with the pathogenesis of Alzheimer's disease (AD); however, the molecular details remain unclear. We used atomistic molecular dynamics (MD) simulations to study the interactions of Aβ40 and Aβ42 with model neuronal membranes. The differences between cholesterol-enriched and depleted lipid domains were investigated by the use of model phosphatidylcholine (PC) lipid bilayers with and without 40 mol % cholesterol. A total of 16 independent 200 ns simulation replicates were investigated. The surface area per lipid, bilayer thickness, water permeability barrier, and lipid order parameter, which are sensitive indicators …
Transient Diffraction Grating Measurements Of Molecular Diffusion In The Undergraduate Laboratory, Daniel Spiegel, Santona Tuli
Transient Diffraction Grating Measurements Of Molecular Diffusion In The Undergraduate Laboratory, Daniel Spiegel, Santona Tuli
Physics and Astronomy Faculty Research
Mass diffusion is a central process in many biological, chemical, and physical systems, and although the mathematics of diffusion has long been an important component of an undergraduate physics education, experimental measurements of diffusion are not very common in the undergraduate laboratory. We describe here an experiment that employs the interference of laser beams to allow measurement of molecular diffusion on micron length scales. The interference fringes of two intersecting “pump” beams within a dye solution create a sinusoidal distribution of long-lived molecular excited states. A third “probe” beam is incident at a wavelength at which the indices of refraction …