Phase diagrams of multicomponent lipid vesicles: Effects of finite size and spherical geometry

2018 ◽  
Vol 149 (17) ◽  
pp. 174901 ◽  
Author(s):  
Yongtian Luo ◽  
Lutz Maibaum
Keyword(s):  
Phase Diagrams ◽  
Finite Size ◽  
Spherical Geometry ◽  
Lipid Vesicles

FEW-PARTICLE ANYON EXCITON: EXACT SOLUTIONS

2003 ◽  
Vol 02 (06) ◽  
pp. 461-468
Author(s):  
D. G. W. PARFITT ◽  
M. E. PORTNOI
Keyword(s):  
Exact Solutions ◽  
Finite Size ◽  
Spherical Geometry ◽  
Planar Geometry ◽  
Quantum Liquid ◽  
Dimensional Electron ◽  
Adequate Description ◽  
Exciton Model ◽  
Finite Size Effects ◽  
Dimensional Electron Gas

The anyon exciton model, which describes an exciton against the background of an incompressible quantum liquid, is generalized to the case of an arbitrary number of anyons. Some mathematical aspects of this quantum-mechanical few-particle problem are considered and several exact solutions are obtained. The four-particle case is also considered in the classical limit in both planar and spherical geometries. Such a classical approach gives an adequate description of an anyon exciton at large separation between the valence hole and the two-dimensional electron gas. It is shown that in this limit in a planar geometry the anyon exciton is always energetically more favorable than a charged anyon ion. This indicates that the appearance of fractionally-charged anyon ions reported in recent numerical calculations is an artefact apparently caused by finite-size effects in a spherical geometry.

scholarly journals Surface and finite size effects impact on the phase diagrams, polar, and dielectric properties of (Sr,Bi)Ta2O9 ferroelectric nanoparticles

2016 ◽  
Vol 119 (20) ◽  
pp. 204104 ◽  
Author(s):  
E. A. Eliseev ◽  
A. V. Semchenko ◽  
Y. M. Fomichov ◽  
M. D. Glinchuk ◽  
V. V. Sidsky ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Phase Diagrams ◽  
Size Effects ◽  
Finite Size ◽  
Finite Size Effects

Simulation of fluid/gel phase equilibrium in lipid vesicles

Soft Matter ◽  
2019 ◽  
Vol 15 (40) ◽  
pp. 8102-8112 ◽  
Author(s):  
David Stelter ◽  
Tom Keyes
Keyword(s):  
Molecular Dynamics ◽  
Phase Equilibrium ◽  
Size Effects ◽  
Finite Size ◽  
Lipid Vesicles ◽  
Finite Size Effects ◽  
Gel Phase ◽  
20 Nm

Simulation of DPPC lipid vesicles of diameter 10 nm (1350 lipids), 20 nm (5100 lipids) and 40 nm (17 600 lipids) is performed using statistical temperature molecular dynamics (STMD), to study finite size effects upon the gel/fluid transition.

scholarly journals Conformational dynamics and phase behavior of lipid vesicles in a precisely controlled extensional flow

Soft Matter ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 337-347 ◽  
Author(s):  
Dinesh Kumar ◽  
Channing M. Richter ◽  
Charles M. Schroeder
Keyword(s):  
Phase Behavior ◽  
Phase Diagrams ◽  
Direct Observation ◽  
Conformational Dynamics ◽  
Extensional Flow ◽  
Lipid Vesicles ◽  
Precise Characterization ◽  
Flow Phase

Direct observation of vesicle conformational dynamics in extensional flow and precise characterization of flow phase diagrams using a Stokes trap.

Finite-size effects on the phase diagrams of binary alloy films

1998 ◽  
Vol 107 (6) ◽  
pp. 285-289 ◽  
Author(s):  
A. Díaz-Ortiz ◽  
J.M. Sanchez ◽  
F. Aguilera-Granja ◽  
J.L. Morán-López
Keyword(s):  
Phase Diagrams ◽  
Binary Alloy ◽  
Size Effects ◽  
Finite Size ◽  
Finite Size Effects ◽  
Alloy Films

scholarly journals Finite-size shifts in simulated protein droplet phase diagrams

2021 ◽  
Vol 154 (23) ◽  
pp. 235101
Author(s):  
Daniel Nilsson ◽  
Anders Irbäck
Keyword(s):  
Phase Diagrams ◽  
Finite Size ◽  
Droplet Phase

scholarly journals Maculatin 1.1 Disrupts Staphylococcus aureus Lipid Membranes via a Pore Mechanism

2013 ◽  
Vol 57 (8) ◽  
pp. 3593-3600 ◽  
Author(s):  
M.-A. Sani ◽  
T. C. Whitwell ◽  
J. D. Gehman ◽  
R. M. Robins-Browne ◽  
N. Pantarat ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Flow Cytometry ◽  
Lipid Membranes ◽  
Finite Size ◽  
Lipid Vesicles ◽  
Random Coil ◽  
Isotropic Phase ◽  
Membrane Composition ◽  
Content Type ◽  
Α Helix

ABSTRACTMaculatin 1.1 (Mac1) showed potent activity againstStaphylococcus aureuswith an MIC of 7 μM. The mode of action of Mac1 was investigated by combining assays withS. aureuscells and lipid vesicles mimicking their membrane composition. A change in Mac1 conformation was monitored by circular dichroism from random coil to ca. 70% α-helix structure in contact with vesicles. Electron micrographs ofS. aureusincubated with Mac1 showed rough and rippled cell surfaces. An uptake of 65% of small (FD, 4 kDa [FD-4]) and 35% of large (RD, 40 kDa [RD-40]) fluorescent dextrans byS. aureuswas observed by flow cytometry and indicate that Mac1 formed a pore of finite size. In model membranes with both dyes encapsulated together, the full release of FD-4 occurred, but only 40% of RD-40 was reached, supporting the flow cytometry results, and indicating a pore size between 1.4 and 4.5 nm. Finally, solid-state nuclear magnetic resonance showed formation of an isotropic phase signifying highly mobile lipids such as encountered in a toroidal pore structure. Overall, Mac1 is a promising antimicrobial peptide with the potent capacity to form pores inS. aureusmembranes.

Collective Mode of Semion Systems

1991 ◽  
Vol 05 (10) ◽  
pp. 1607-1613
Author(s):  
X. C. Xie ◽  
Song He ◽  
S. Das Sarma
Keyword(s):  
Collective Mode ◽  
Mean Field Theory ◽  
Mean Field ◽  
Finite Size ◽  
Spherical Geometry ◽  
Single Mode ◽  
Repulsive Interaction ◽  
Linear Dispersion ◽  
Roton Minimum ◽  
Single Mode Approximation

The ground and the excited states of a two-dimensional anyon system are studied via finite-size numerical calculations and single-mode approximation in a spherical geometry. It is shown that Laughlin's mean field theory gives an accurate description of the ground state properties. We find, consistent with earlier analytic theories, that the collective mode of the system exhibits a linear dispersion in the long wavelength limit, and predict a novel roton minimum at a finite value of the wavenumber q. We also discuss the consequences on the anyon spectrum of having a model repulsive interaction between the particles.

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