Results 11 to 20 of about 4,695,040 (225)

Using Curved Fluid Boundaries to Confine Active Nematic Flows

Frontiers in Physics, 2022
Actively driven, bundled microtubule networks, powered by molecular motors have become a useful framework in which to study the dynamics of energy-driven defects, but achieving control of defect motions is still a challenging problem.
Dimitrius A. Khaladj, Linda S. Hirst
doaj   +2 more sources

Active Nematic Flows over Curved Surfaces. [PDF]

Physical Review Letters, 2022
Cell monolayers are a central model system in the study of tissue biophysics. In vivo, epithelial tissues are curved on the scale of microns, and the curvature's role in the onset of spontaneous tissue flows is still not well understood. Here, we present
Samuel Bell, Shao-Zhen Lin, Jean-François Rupprecht, J. Prost   +3 more
semanticscholar   +5 more sources

Mitigating density fluctuations in particle-based active nematic simulations [PDF]

Communications Physics
Understanding active matter has led to new perspectives on biophysics and non-equilibrium dynamics. However, the development of numerical tools for simulating active fluids capable of incorporating non-trivial boundaries or inclusions has lagged behind ...
Timofey Kozhukhov, Benjamin Loewe, Tyler N. Shendruk   +2 more
doaj   +2 more sources

Three-dimensional spontaneous flow transition in a homeotropic active nematic [PDF]

Communications Physics, 2023
Active nematics are driven, non-equilibrium systems relevant to biological processes including tissue mechanics and morphogenesis, and to active metamaterials in general.
Vincenzo J. Pratley, Enej Caf, Miha Ravnik, Gareth P. Alexander   +3 more
doaj   +2 more sources

Aging and freezing of active nematic dynamics of cancer-associated fibroblasts by fibronectin matrix remodeling

bioRxiv, 2023
Cancer-associated fibroblasts (CAFs) are one of the most abundant cell types in tumor stroma. Exhibiting an elongated morphology, CAFs align with each other, closely resembling nematic ordering in liquid crystal physics.
Jacques C, Perrin L, Ackermann J, Bell S, Zajac O, Lapierre A, Anger L, Hallopeau C, Pérez-González C, Balasubramaniam L, Trepat X, Ladoux B, Maitra A, Voituriez R, Matic Vignjevic D.   +14 more
europepmc   +2 more sources

Order-disorder transition in active nematic: A lattice model study [PDF]

Scientific Reports, 2017
We introduce a lattice model for active nematic composed of self-propelled apolar particles, study its different ordering states in the density-temperature parameter space, and compare with the corresponding equilibrium model.
Rakesh Das, Manoranjan Kumar, Shradha Mishra   +2 more
doaj   +2 more sources

Discontinuous transition to active nematic turbulence [PDF]

Nature Communications
Active fluids exhibit chaotic flows at low Reynolds number known as active turbulence. Whereas the statistical properties of the chaotic flows are increasingly well understood, the nature of the transition from laminar to turbulent flows as activity ...
Malcolm Hillebrand, Ricard Alert
doaj   +2 more sources

Active Nematic Defects and Epithelial Morphogenesis. [PDF]

Physical Review Letters, 2021
Inspired by recent experiments that highlight the role of nematic defects in the morphogenesis of epithelial tissues, we develop a minimal framework to study the dynamics of an active curved surface driven by its nematic texture.
Farzan Vafa, L. Mahadevan
semanticscholar   +4 more sources

Fingering instability of active nematic droplets [PDF]

Journal of Physics A: Mathematical and Theoretical, 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.
Ricard Alert
semanticscholar   +4 more sources

Active nematic response to a deformable body or boundary: Elastic deformations and anchoring-induced flow

Physical Review Research
A body immersed in a nematic liquid crystal disturbs the fluid's preferred molecular configuration and increases its stored elastic energy. In an active nematic, the fluid components also generate a stress in the bulk fluid.
Thomas G. J. Chandler, Saverio E. Spagnolie   +1 more
doaj   +2 more sources