Results 21 to 30 of about 3,056 (193)

Integer topological defects offer a methodology to quantify and classify active cell monolayers [PDF]

Nature Communications
Monolayers of confluent elongated cells are frequently considered active nematics, featuring $$\pm \frac{1}{2}$$ ± 1 2 topological defects. In extensile systems, where cells extend further along their long axis, they can accumulate at $$+\frac{1}{2 ...
Zihui Zhao, He Li, Yisong Yao, Yongfeng Zhao, Francesca Serra, Kyogo Kawaguchi, Hepeng Zhang, Masaki Sano   +7 more
doaj   +2 more sources

Emergence of Radial Tree of Bend Stripes in Active Nematics

Physical Review X, 2019
Living liquid crystals, a realization of active nematics where a lyotropic liquid crystal is combined with active bacteria, exhibit a plethora of out-of-equilibrium phenomena that range from active turbulence and dynamic spatiotemporal patterns to the ...
Andrey Sokolov, Ali Mozaffari, Rui Zhang, Juan J. de Pablo, Alexey Snezhko   +4 more
doaj   +2 more sources

Electrically activated ferroelectric nematic microrobots

Nature Communications
Ferroelectric nematic liquid crystals are fluids exhibiting spontaneous electric polarization, which is coupled to their long range orientational order. Due to their inherent property of making bound and surface charges, the free surface of ferroelectric
Marcell Tibor Máthé, Hiroya Nishikawa, Fumito Araoka, Antal Jákli, Péter Salamon   +4 more
doaj   +4 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

Spontaneous flows and quantum analogies in heterogeneous active nematic films [PDF]

Communications Physics
Incorporating the inherent heterogeneity of living systems into models of active nematics is essential to provide a more realistic description of biological processes such as bacterial growth, cell dynamics and tissue development.
Alexander J. H. Houston, Nigel J. Mottram   +1 more
doaj   +2 more sources

Machine learning active-nematic hydrodynamics [PDF]

Proceedings of the National Academy of Sciences, 2021
Hydrodynamic theories effectively describe many-body systems out of equilibrium in terms of a few macroscopic parameters. However, such parameters are difficult to determine from microscopic information. Seldom is this challenge more apparent than in active matter, where the hydrodynamic parameters are in fact fields that encode the distribution of ...
Jonathan Colen, Ming Han, Rui Zhang, Steven A. Redford, Linnea M. Lemma, Link Morgan, Paul V. Ruijgrok, Raymond Adkins, Zev Bryant, Zvonimir Dogic, Margaret L. Gardel, Juan J. de Pablo, Vincenzo Vitelli   +12 more
openaire   +6 more sources

Defect dynamics in active nematics. [PDF]

Philos Trans A Math Phys Eng Sci, 2014
Topological defects are distinctive signatures of liquid crystals. They profoundly affect the viscoelastic behaviour of the fluid by constraining the orientational structure in a way that inevitably requires global changes not achievable with any set of local deformations.
Giomi L, Bowick MJ, Mishra P, Sknepnek R, Cristina Marchetti M.   +4 more
europepmc   +6 more sources

Topological structure and dynamics of three-dimensional active nematics. [PDF]

Science, 2020
Duclos G, Adkins R, Adkins R, Banerjee D, Peterson MSE, Varghese M, Kolvin I, Baskaran A, Pelcovits RA, Powers TR, Baskaran A, Toschi F, Hagan MF, Streichan SJ, Vitelli V, Beller DA, Dogic Z.   +16 more
europepmc   +2 more sources

Data-driven quantitative modeling of bacterial active nematics. [PDF]

Proc Natl Acad Sci U S A, 2019
Li H, Shi XQ, Huang M, Chen X, Xiao M, Liu C, Chaté H, Zhang HP.   +7 more
europepmc   +2 more sources

Active nematic multipoles: Flow responses and the dynamics of defects and colloids

Frontiers in Physics, 2023
We introduce a general description of localised distortions in active nematics using the framework of active nematic multipoles. We give the Stokesian flows for arbitrary multipoles in terms of differentiation of a fundamental flow response and describe ...
Alexander J. H. Houston, Alexander J. H. Houston, Gareth P. Alexander, Gareth P. Alexander   +3 more
doaj   +1 more source