Zobrazeno 1 - 10
of 100
pro vyhledávání: '"Alert, Ricard"'
Autor:
Banerjee, Debarghya, Alert, Ricard
Several types of active agents self-propel by spinning around their propulsion axis, thus behaving as active screws. Examples include cytoskeletal filaments in gliding assays, magnetically-driven colloidal helices, and microorganisms like the soil ba
Externí odkaz:
http://arxiv.org/abs/2410.12263
Active fluids display spontaneous turbulent-like flows known as active turbulence. Recent work revealed that these flows have universal features, independent of the material properties and of the presence of topological defects. However, the differen
Externí odkaz:
http://arxiv.org/abs/2407.15149
Buckling instabilities driven by tissue growth underpin key developmental events such as the folding of the brain. Tissue growth is disordered due to cell-to-cell variability, but the effects of this variability on buckling are unknown. Here, we anal
Externí odkaz:
http://arxiv.org/abs/2407.07540
Active nematics exhibit spontaneous flows through a well-known linear instability of the uniformly-aligned quiescent state. Here we show that even a linearly stable uniform state can experience a nonlinear instability, resulting in a discontinuous tr
Externí odkaz:
http://arxiv.org/abs/2403.16841
Publikováno v:
Phys. Rev. X 14, 031008 (2024)
Flocking, as paradigmatically exemplified by birds, is the coherent collective motion of active agents. As originally conceived, flocking emerges through alignment interactions between the agents. Here, we report that flocking can also emerge through
Externí odkaz:
http://arxiv.org/abs/2401.17153
Autor:
Han, Endao, Fei, Chenyi, Alert, Ricard, Copenhagen, Katherine, Koch, Matthias D., Wingreen, Ned S., Shaevitz, Joshua W.
Colonies of the social bacterium Myxococcus xanthus go through a morphological transition from a thin colony of cells to three-dimensional droplet-like fruiting bodies as a strategy to survive starvation. The biological pathways that control the deci
Externí odkaz:
http://arxiv.org/abs/2308.00368
Autor:
Alert, Ricard
Publikováno v:
J. Phys. A: Math. Theor. 55, 234009 (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 con
Externí odkaz:
http://arxiv.org/abs/2202.14027
Autor:
Brandstätter, Tom, Brückner, David B., Han, Yu Long, Alert, Ricard, Guo, Ming, Broedersz, Chase P.
The multicellular organization of diverse systems, such as embryos, intestines and tumours, relies on the coordinated migration of cells in 3D curved environments. In these settings, cells establish supracellular patterns of motion, including collect
Externí odkaz:
http://arxiv.org/abs/2110.14614
Publikováno v:
Eur. Phys. J. E 45, 7 (2022)
Many types of motile cells perform durotaxis, namely, directed migration following gradients of substrate stiffness. Recent experiments have revealed that cell monolayers can migrate toward stiffer regions even when individual cells do not -- a pheno
Externí odkaz:
http://arxiv.org/abs/2110.14316
Publikováno v:
Phys. Rev. Lett. 128, 148101 (2022)
In contexts ranging from embryonic development to bacterial ecology, cell populations migrate chemotactically along self-generated chemical gradients, often forming a propagating front. Here, we theoretically show that the stability of such chemotact
Externí odkaz:
http://arxiv.org/abs/2107.11702