ESPCI web site
PMMH’s weekly seminar is held every Friday at 11 am (map)
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH – Lara Kohler (Max Planck Dresden)
Flow–wave coupling synchronizes oscillations in growing active matter
Oscillatory biochemical signals and mechanical forces must coordinate robustly during development, yet the principles governing their mutual coupling remain poorly understood. In syncytial embryos and cell-free extracts, mitotic waves propagate across millimeter scales while simultaneously generating cytoplasmic flows, suggesting a two-way interaction between chemical oscillators and mechanics. Here, we combine experiments in Xenopu Laevis cytoplasmic extracts with a minimal particle-based model to uncover a mechanochemical feedback that stabilizes wave propagation. Particles grow slowly and shrink rapidly under cell-cycle control ; this asymmetric size cycle, together with size-dependent mechanical interactions, generates flows aligned with the phase gradient. These flows mix particles, promote neighbor exchange, and enhance phase synchronization. As a result, asynchrony generates flows, and these flows eliminate asynchrony, producing a robust transition from a flowing, disordered state to a synchronized, mechanically quiescent one. Our results show that mechanical forces do not merely perturb biochemical wave, but actively maintain their coherence, providing a general mechanism for long-range order in oscillating active matter.
- Seminar archive
- Recent seminars
- Seminars
Recent seminars (6)
-
Séminaire PMMH – Aubin Archambault (IUSTI, Marseille)
Vendredi 12 décembre 2025 de 11h00 à 12h00 - Salle réunion PMMH 1
-
Séminaire PMMH – Francesca Borghi (U. Milan)
Vendredi 5 décembre 2025 de 11h00 à 12h00 - Salle réunion PMMH 1
Reprogrammable hardware for data processing at the edge : a new computing paradigm based on neuromorphic systems
The brain's ability to perform efficient and fault-tolerant data processing is strongly related with its peculiar interconnected adaptive architecture, based on redundant neural circuits interacting at different scales. By emulating the brain's processing and learning mechanisms, computing technologies strive to (…) -
Séminaire PMMH – Paddy Royall (Gulliver, ESPCI Paris)
Vendredi 28 novembre 2025 de 11h00 à 12h00 - Salle réunion PMMH 1
-
Séminaire PMMH – Christiana Mavroyiakoumou (Oxford University)
Vendredi 21 novembre 2025 de 11h00 à 12h00 - Salle réunion PMMH 1
-
Séminaire PMMH – Romain Mari (LiPhy, Grenoble)
Vendredi 14 novembre 2025 de 11h00 à 12h00 - Salle réunion PMMH 1
-
Séminaire PMMH – Christina Kurzthaler (MPI Dresden)
Vendredi 7 novembre 2025 de 11h00 à 12h00 - Salle réunion PMMH 1
Microbes in motion : from surface interactions to porous media
Swimming microorganisms represent fascinating exemplars of non-equilibrium systems and display a range of unusual physical phenomena. These active agents often operate in complex environments, characterized by confining boundaries and flows, that can strongly modify their swimming dynamics. In this talk, I will (…)
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
