article · 20/11/2017
Forces in inhomogeneous open active-particle systems
Résumé
We study the force that noninteracting pointlike active particles apply to a symmetric inert object in the presence of a gradient of activity and particle sources and sinks. We consider two simple patterns of sources and sinks that are common in biological systems. We analytically solve a one-dimensional model designed to emulate higher-dimensional systems, and study a two-dimensional model by numerical simulations. We specify when the particle flux due to the creation and annihilation of particles can act to smooth the density profile that is induced by a gradient in the velocity of the active particles, and find the net resultant force due to both the gradient in activity and the particle flux. These results are compared qualitatively to observations of nuclear motion inside the oocyte, that is driven by a gradient in activity of actin-coated vesicles.
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Razin, N., Voituriez, R., Elgeti, J., & Gov, N.-S. (2017). Forces in inhomogeneous open active-particle systems. PHYSICAL REVIEW E, 96(5). https://doi.org/10.1103/PhysRevE.96.052409@article{Razin2017_166,
author = {Razin, Nitzan and Voituriez, Raphael and Elgeti, Jens and Gov, Nir S.},
year = {2017},
month = {11},
title = {Forces in inhomogeneous open active-particle systems},
journal = {PHYSICAL REVIEW E},
volume = {96},
number = {5},
abstract = {We study the force that noninteracting pointlike active particles apply to a symmetric inert object in the presence of a gradient of activity and particle sources and sinks. We consider two simple patterns of sources and sinks that are common in biological systems. We analytically solve a one-dimensional model designed to emulate higher-dimensional systems, and study a two-dimensional model by numerical simulations. We specify when the particle flux due to the creation and annihilation of particles can act to smooth the density profile that is induced by a gradient in the velocity of the active particles, and find the net resultant force due to both the gradient in activity and the particle flux. These results are compared qualitatively to observations of nuclear motion inside the oocyte, that is driven by a gradient in activity of actin-coated vesicles.},
url = {http://www.dx.doi.org/10.1103/PhysRevE.96.052409},
doi = {10.1103/PhysRevE.96.052409},
issn = {2470-0045},
}TY - JOUR
AU - Razin, Nitzan
AU - Voituriez, Raphael
AU - Elgeti, Jens
AU - Gov, Nir S.
PY - 2017
DA - 2017/11/20
TI - Forces in inhomogeneous open active-particle systems
JO - PHYSICAL REVIEW E
VL - 96
IS - 5
SN - 2470-0045
AB - We study the force that noninteracting pointlike active particles apply to a symmetric inert object in the presence of a gradient of activity and particle sources and sinks. We consider two simple patterns of sources and sinks that are common in biological systems. We analytically solve a one-dimensional model designed to emulate higher-dimensional systems, and study a two-dimensional model by numerical simulations. We specify when the particle flux due to the creation and annihilation of particles can act to smooth the density profile that is induced by a gradient in the velocity of the active particles, and find the net resultant force due to both the gradient in activity and the particle flux. These results are compared qualitatively to observations of nuclear motion inside the oocyte, that is driven by a gradient in activity of actin-coated vesicles.
DO - 10.1103/PhysRevE.96.052409
UR - http://www.dx.doi.org/10.1103/PhysRevE.96.052409
ER -