Results 1 to 10 of about 210,885 (75)

Fingering Instability of Active Nematic Droplets [PDF]

J. Phys. A: Math. Theor. 55, 234009 (2022), 2022
From the mitotic spindle up to tissues and biofilms, many biological systems behave as active droplets, which often break symmetry and change shape spontaneously. Here, I show that active nematic droplets can experience a fingering instability. I consider an active fluid that acquires nematic order through anchoring at the droplet interface, and I ...
arxiv   +1 more source

Dynamic shapes of floppy vesicles enclosing active Brownian particles with membrane adhesion [PDF]

Soft Matter 19, 3436-3449 (2023), 2023
Recent advances in micro- and nano-technologies allow the construction of complex active systems from biological and synthetic materials. An interesting example is active vesicles, which consist of a membrane enclosing self-propelled particles, and exhibit several features resembling biological cells.
arxiv   +1 more source

Morphology of active deformable 3D droplets [PDF]

Phys. Rev. X 11, 021001 (2021), 2020
We numerically investigate the morphology and disclination line dynamics of active nematic droplets in three dimensions. Although our model only incorporates the simplest possible form of achiral active stress, active nematic droplets display an unprecedented range of complex morphologies.
arxiv   +1 more source

Future Directions for Active Matter on Ordered Substrates [PDF]

EPL 139, 27001 (2022), 2022
Active matter is a term encompassing particle-based assemblies with some form of self-propulsion, including certain biological systems as well as synthetic systems such as artificial colloidal swimmers, all of which can exhibit a remarkable variety of new kinds of nonequilibrium phenomena.
arxiv   +1 more source

BioCode: A Data-Driven Procedure to Learn the Growth of Biological Networks [PDF]

, 2021
Probabilistic biological network growth models have been utilized for many tasks including but not limited to capturing mechanism and dynamics of biological growth activities, null model representation, capturing anomalies, etc. Well-known examples of these probabilistic models are Kronecker model, preferential attachment model, and duplication-based ...
arxiv   +1 more source

Chemical principles of instability and self-organization in reacting and diffusive systems [PDF]

arXiv, 2022
How patterns and structures undergo symmetry breaking and self-organize within biological systems from initially homogeneous states is a key issue for biological development. The activator-inhibitor (AI) mechanism, derived from reaction-diffusion (RD) models, has been widely believed to be the elementary mechanism for biological pattern formation. This
arxiv  

Photo-activated biological processes as quantum measurements [PDF]

, 2014
We outline a framework for describing photo-activated biological reactions as generalized quantum measurements of external fields, for which the biological system takes on the role of a quantum meter. By using general arguments regarding the Hamiltonian that describes the measurement interaction, we identify the cases where it is essential for a ...
arxiv   +1 more source

Phase separation in a two-dimensional binary colloidal mixture by quorum sensing activity [PDF]

Phys. Rev. E 101, 022606 (2020), 2019
We present results from Langevin dynamics simulations of a glassy active-passive mixture of soft-repulsive binary colloidal disks. Activity on the smaller particles is applied according to the quorum sensing scheme, in which a smaller particle will be active for a persistence time if its local nearest neighbors are equal to or greater than a certain ...
arxiv   +1 more source

Active Darcy's Law [PDF]

arXiv, 2023
While bacterial swarms can exhibit active turbulence in vacant spaces, they naturally inhabit crowded environments. We numerically show that driving disorderly active fluids through porous media enhances Darcy's law. While purely active flows average to zero flux, hybrid active/driven flows display greater drift than pure-driven fluids.
arxiv  

Localized states in active fluids [PDF]

, 2022
Biological active matter is typically tightly coupled to chemical reaction networks affecting its assembly-disassembly dynamics and stress generation. We show that localized states can emerge spontaneously if assembly of active matter is regulated by chemical species that are advected with flows resulting from gradients in the active stress.
arxiv   +1 more source