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2024-04-27
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Beethoven Svetlin Roussev François Salque Blanch 1770 1827 2019
Ludwig van BEETHOVEN +••.••(...)) Triple concerto for violin, cello, piano and orchestra in C Op. 56 Allegro Largo Rondo alla polacca The Geneva Chamber Orchestra Benoît Willmann, conductor Svetlin Roussev, violon François Salque, violoncelle Christian Chamorel, piano JBP FILMS (J.Blanch Productions) Live at the Geneva Puplinge Classique 2019
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).
Luís Freitas Branco Németh Blanch 1926 1927 1928
LUÍS DE FREITAS BRANCO - SINFONIA NRº 2 , em Si bemol Menor (1927) I. Andante - Allegro ( 00:00:00 - 13:42 ) II. Andantino con moto ( 13:48 ) III. Allegro vivace ( 24:46 ) IV. Adagio - Allegro ( 33:23 ) Gyula Németh, Conductor Hungarian State Orchestra A Segunda Sinfonia de Luís de Freitas Branco foi concebida essencialmente em 1926, tendo sido terminada em finais de 1927. A Segunda Sinfonia é dedicada à irmã do compositor que optou pela vida religiosa, tornando-se freira num Convento de Carmelitas em Espanha, o que explica que esta Sinfonia tenha no Canto Gregoriano, a raiz cíclica dos seus temas. A Segunda Sinfonia em Si Bemol Menor de Luís de Freitas Branco foi estreada na temporada da Orquestra Sinfónica Portuguesa, no Teatro São Luiz, a 26 de Fevereiro de 1928. O maestro que assegurou a estreia foi Pedro Blanch.
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