Michel Roux Vídeos
cantante de ópera francés
Conmemoraciones 2024 (Nacimiento: Michel Roux)
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2024-04-28
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Guillamat Prost Marchetti Toyama Kawaguchi Kageyama Sacks Shani Blanch Kruse Topology 1995 2013 2015 2017 2020 2021
This talk was part of the of the online workshop on "Interdisciplinary Challenges in Nonequilibrium Physics" held April 12 - 16, 2021. Discontinuities within orientational fields configure topological defects [1]. They are often present in materials featuring orientational, nematic, order, and can be found in very diverse areas, which span a vast range of length scales [2]. Interestingly, in active nematic systems, topological defects imply not only strong orientational gradients but also well-defined flow and stress patterns in very localized regions [3]. Recent works have shown the influence of these defects in determining the dynamics of living systems, from cell monolayers [4–6] to simple organisms [7]. Here, we study how nematic monolayers composed of muscle cells self-organize and evolve under circular confinement, which enforces a topological charge S=+1. Under strong confinements, with size competing with the characteristic nematic correlation length, the formation of half-integer defects (s=±1/2) is hampered, resulting in spontaneous cellular arrangements with one single integer defect (s=+1) at the center of the islands, namely, rotating spirals and quasi-static asters [8]. These singularities imply distinct mechanical fields, which lead, eventually, to the localized expression of muscle-specific proteins and the formation of 3D nematic cellular protrusions [9]. [1] P. G. de Gennes and J. Prost, The Physics of Liquid Crystals (Clarendon Press, 1995). [2] M. C. Marchetti, J. F. Joanny, S. Ramaswamy, T. B. Liverpool, J. Prost, M. Rao, and R. A. Simha, Hydrodynamics of Soft Active Matter, Rev. Mod. Phys. 85, 1143 (2013). [3] L. Giomi, Geometry and Topology of Turbulence in Active Nematics, Phys. Rev. X 5, 031003 (2015). [4] G. Duclos, C. Erlenkamper, J.-F. Joanny, and P. Silberzan, Topological Defects in Confined Populations of Spindle-Shaped Cells, Nat Phys 13, 58 (2017). [5] T. B. Saw, A. Doostmohammadi, V. Nier, L. Kocgozlu, S. Thampi, Y. Toyama, P. Marcq, C. T. Lim, J. M. Yeomans, and B. Ladoux, Topological Defects in Epithelia Govern Cell Death and Extrusion, Nature 544, 212 (2017). [6] K. Kawaguchi, R. Kageyama, and M. Sano, Topological Defects Control Collective Dynamics in Neural Progenitor Cell Cultures, Nature 545, 327 (2017). [7] Y. Maroudas-Sacks, L. Garion, L. Shani-Zerbib, A. Livshits, E. Braun, and K. Keren, Topological Defects in the Nematic Order of Actin Fibres as Organization Centres of Hydra Morphogenesis, Nat. Phys. (2020). [8] C. Blanch-Mercader, P. Guillamat, A. Roux, and K. Kruse, Quantifying Material Properties of Cell Monolayers by Analyzing Integer Topological Defects, Phys. Rev. Lett. 126, 028101 (2021). [9] P. Guillamat, C. Blanch-Mercader, K. Kruse, and A. Roux, Integer Topological Defects Organize Stresses Driving Tissue Morphogenesis, BioRxiv 2020.06.02.129262 (2020).
Michel Roux shows how to make a juicy and tender roast monkfish with the side of french beans cooked in the Lyonnaise style! Catch full episodes of your favourite Food Network shows on discovery+: (http•••) Subscribe to Food Network UK for more great clips: (http•••) Like Food Network UK on Facebook: (http•••) Follow Food Network UK on Twitter: (http•••) Follow Food Network UK on Instagram:(http•••) Visit our website: (http•••)
Henze Prinz William Cochran Helga Dernesch Claes Claes Håkan Ahnsjö Hans Günter Nöcker Wolfgang Sawallisch 1994
William Cochran (tenor) Elector of Brandenburg; Helga Dernesch (soprano) Electress of Brandenburg; Mari Anne Häggander (soprano) Princess Natalie François Le Roux (baritone) Prince Friedrich von Homburg; Claes-Håkan Ahnsjö (tenor) Count Hohenzollern; Hans Günter Nöcker (bass-baritone) Field Marshal Dörfling Conductor: Wolfgang Sawallisch Director: Niholaus Lenhoff reg.1994
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- cronología: Cantantes líricos (Europa).
- Índices (por orden alfabético): R...