Séminaires à venir

09 DÉC

The Countoscope: Quantifying Dynamics by Counting Particles in Boxes Par Sophie Marbach - Laboratoire PHENIX, Sorbonne Université, Paris, France Le 9 Décembre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Quantifying the dynamics of particle suspensions is a widespread interest in soft matter. For instance, probing the motion of cells or larger organisms can help us understand biological behavior. When...

16 DÉC

AI mini-symposium at LJP Par AI mini-symposium at LJP Le 16 Décembre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Program here

13 JAN

TBA Par Thijs van der Plas - The Alan Turing Institute, London, UK Le 13 Janvier 2026 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 TBA

20 JAN

TBA Par Owen Randlett - Université Claude Bernard Lyon 1, Lyon, France Le 20 Janvier 2026 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 TBA

10 FÉV

TBA Par Pierre Recho - Laboratoire Inter-disciplinaire de Physique, Université Grenoble Alpes, Saint-Martin-d'Heres Le 10 Février 2026 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 TBA

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Séminaires passés

Beyond Hopfield networks for the modeling of neural computations Par Alexis Dubreuil - Institut des Maladies Neurodégénératives, Univ. Bordeaux-CNRS, Bordeaux & LJP, Sorbonne Université, Paris Le 25 Novembre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 How does the collective activity of neurons leads to the emergence of behavior ? Attractor neural networks, such as the Hopfield model, have been proposed to underlie various computations involved in ...

Not gently down the stream: flow induces amyloid bonding in environmental and pathological fungal biofilms Par Peter Lipke - Brooklyn College, City University of New York, New York, USA - !!! UNUSUAL DATE !!! Le 12 Novembre 2025 à 11h00 - Salle de séminaire IBPS - C404 (Bat C 4e Etage) On the surface of fungal cells under shear stress, amyloid-like cross-β bonds cluster adhesins to make high avidity adhesive patches. The cross-b bonding is essential for formation of robust ...

Modulating photobleaching and phototoxicity with near-infrared co-illumination in fluorescence microscopy Par Lydia Robert - MICALIS - INRAE Jouy-en Josas & Agathe Espagne - Dept of Chemistry, ENS Paris Le 4 Novembre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Fluorescence microscopy is often limited by photobleaching, which fades fluorescent signals, and by phototoxicity, which damages living cells during imaging. Photobleaching is thought to involve the ...

Intrinsic fluctuations in arousal shape the dynamic organization of the mouse brain large-scale networks Par Jean Charles Mariani - Istituto Italiano di Tecnologia, Genoa, Italy Le 7 Octobre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Despite decades of applications in both clinical and preclinical settings, the exact nature of large-scale functional connectivity (FC) and resting-state network (RSN) activity remains debated. It has...

Memory and environment sensing in active systems Par Marc Besse, Laboratoire Jean Perrin, CNRS UMR 8237, Sorbonne Université, Paris Le 30 Septembre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Active systems, such as living cells, are traditionally modelled via self-propelled particles driven by internal forces. It is however often assumed that these internal forces do not depend on the ...

Evolution of error correction through a need for speed Par Riccardo Ravasio - University of Chicago Le 23 Septembre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Kinetic proofreading is an error-correcting mechanism by which biology expends energy to avoid mistakes during processes like replication and translation. Proofreading is typically assumed to evolve ...

3D cell mounds at topological defects Par Pascal Silberzan - Institut Curie, Centre de Recherche, CNRS UMR 168, Paris Le 16 Septembre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 3D tissues that develop from a monolayer can take different forms: from folded monolayers -tubes or spheres - to bulk tridimensional tissues such as muscles, stratified epithelia, or epithelial ...

Organizing space through liquid-liquid phase separation of biomolecules Par Audrey Cochard Le 9 Septembre 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Liquid-liquid phase separation (LLPS) has emerged as a central principle of subcellular organization. While membraneless condensates composition and function are increasingly understood, how cells ...

From active particles to flexible, deformable, and motile superstructures : a new type of soft robot of robots Par Hamid Kellay - Laboratoire Ondes et Matière d’Aquitaine (LOMA) - Université de Bordeaux - Talence Le 24 Juin 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 We study assemblies of rodlike robots made motile through self-vibration. When confined by circular scaffolds, dilute assemblies of these rods act as a 2D gas of particles. Above a critical surface ...

Dynamical Properties of Dense Associative Memory Par Kazushi Miruma Le 17 Juin 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 The dense associative memory is one of the basic modern Hopfield networks and can store large numbers of memory patterns. This model stores given patterns as attractors in its dynamics. While the ...

Plant root growth in mechanically heterogeneous substrates Par Evelyne Kolb - Laboratoire PMMH - ESPCI -Paris Le 3 Juin 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 The interaction between plant roots and soils is an interdisciplinary issue that concerns many communities, from biophysics and agronomy to civil engineering and geophysics. The presence of zones of ...

Model of immunotherapy in microfluidic droplets Par Charles Baroud - Physical Microfluidics & Bio-engineering - Institut Pasteur & Ecole Polytechnique Le 13 Mai 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 In this seminar I will show the approach we have developed to study the interactions between cytotoxic T cells and cancer spheroids in microfluidic droplets. I will describe the original technical ...

Multicellular development and collective behavior in the closest living relatives of animals Par Thibaut Brunet - Biologie cellulaire évolutive et évolution de la morphogenèse, Institut Pasteur, Paris Le 6 Mai 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 The origin of animals from unicellular ancestors has been a key step in our evolutionary origins. However, the cellular and molecular basis of this transition remain incompletely understood.  In ...

Microenvironmental cues and immune cell migration Par Hélène Moreau - Institut Curie, : Immunité et Cancer - Dynamique spatio-temporelle des cellules du système immunitaire Le 8 Avril 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Cell migration is a pivotal process in immunity. Indeed, appropriate immune responses (i.e. efficient but not detrimental to the host) rely on the coordinated actions of multiple cellular players. ...

Maximally informative low-resolution representations of proteins highlight key intermediate steps along the folding pathway Par Roberto Menichetti - Physics Department, University of Trento - Italy Le 1 Avril 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Maximally informative low-resolution representations of proteins highlight key intermediate steps along the folding pathway Roberto Menichetti *1,2 1Physics Department, University of Trento, Via ...

Towards mature biofilms – Impact of physical triggers in the transition and outdifferentiation of gonococcal colonies Par Marc Hennes Le 31 Mars 2025 à 11h00 - Zoom Biofilm formation is a hallmark of prokaryotic lifestyle and is characterized by strong regulation and out-differentiation of subpopulations with distinct properties. During maturation, embedded ...

Microfluidic Flow Induced by Magnetically Actuated Microscopic Cilia Par Charles Paul MOORE - Matière et Systèmes Complexes, Université Paris Cité, Paris Le 25 Mars 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - Tours 22-32 - 4e étage - Pièce 407 Lungs are lined with a thin layer of mucus which aids in clearing away foreign particulate. To remove this dirty mucus from the lung, bronchi are lined with cilia: small hair-like structures which ...

From structure to function in biology Par Stéphane BIEDZINSKI - CIRB, Collège de France, Paris Le 20 Mars 2025 à 10h00 - Laboratoire Jean Perrin - Campus Jussieu - Tours 22-32 - 4e étage - Pièce 407 In Biology, structure and function are tightly linked. When considering physical properties of a biological system this link might seem obvious but when it comes to connecting structure to a ...

Living organisms dealing with water surface physics Par Ludovic JAMI - Laboratoire INPHYNI, Nice, France Le 18 Mars 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - Tours 22-32 - 4e étage - Pièce 407 My research focus on complex physics problems for the understanding of organisms' adaptation and the interactions with their environment. In my presentation, I will present briefly works on ...

Multi-modal learning methods for single-cell data integration Par Laura CANTINI - Institut Pasteur - CNRS UMR 3738 - Paris Le 11 Mars 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - Tours 22-32 - 4e étage - Pièce 407 Single-cell RNA sequencing (scRNAseq) is revolutionizing biology and medicine. The possibility to assess cellular heterogeneity at a previously inaccessible resolution, has profoundly impacted our ...

Self-Patterned Materials: From droplet emulsions and photonic foams to arrays of artificial cells on a chip Par Joshua Ricouvier - Chemical and Biological Physics Department, Weizmann Institute of Science, Israel Le 6 Mars 2025 à 10h00 - On Zoom During my PhD at the Microfluidics Laboratory (P. Tabeling, MMN, ESPCI Paris), I focused on the fabrication of disordered photonic materials. Bidisperse emulsions self-assemble on a chip to create ...

Understanding plants through motions Par Mathieu RIVIERE - Laboratoire IUSTI, Aix-Marseille Université, France Le 4 Mars 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - Tours 22-32 - 4e étage - Pièce 407 While plants are sessile organisms, they display an extraordinary variety of movements. The interest of these is two-fold: (i) they rely on a rich diversity of physical mechanisms and (ii) they occur ...

Dynamics of motile bacterial suspensions: reaction to oxygen and interaction with passive particles Par Julien BOUVARD - Living Systems Institute, University of Exeter, UK Le 11 Février 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - Tours 22-32 - 4e étage - Pièce 407 The swimming motion of bacteria has recently seen an increasing interest from physicists, utilizing the recent progresses in microscopy and the development of microfluidics to study this ...

Mechanics of living systems: pressing for answers Par Valentin LAPLAUD - Ladhyx, Ecole Polytechnique, France Le 4 Février 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - Barre Cassan - Bâtiment C - Etage 4 -salle C404 In this talk I will present the two experimental systems that I have develloped during my PhD and postdoc : a magnetic pincher to probe the cortex of living animal cells and a microfluidic chip to ...

Development of physiologically-relevant microvessels for tissue engineering: when mechanics guides vessel formation Par Mathieu Hautefeuille - IBPS - Sorbonne-Université - Developmental Biology and Microphysiological Systems Le 28 Janvier 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - Tours 22-32 - 4e étage - Pièce 407 In this seminar, I will present the past and current work of my team at IBPS, aiming at constructing perfusable microvessels to develop physiologically-relevant tissue microenvironments on ...

Towards emulsion-based functional materials: from stimulable polymer capsules to biomimetic programmable colloidal assemblies Par Lucas SIXDENIER - Dept. of Physics, New York University, New York, USA Le 27 Janvier 2025 à 16h00 - On Zoom Microemulsions, i.e. dispersions of liquid droplets in another liquid in which they are not soluble, are versatile platforms for the design of functional soft materials, such as ...

Forty years of Boltzmann machines and counting Par Rémi Monasson - LPENS Le 21 Janvier 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Botlzmann machines were invented 40 years ago and awarded the Nobel Prize in Physics last October. The talk will review the basic principles of these machines, and two recent developments we have done...

How does a bacterial adhesin make up its MinD? Par Nicolas DESPRAT - Laboratoire de Physique de l'ENS - Paris Le 14 Janvier 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Surface proteins are essential components of bacteria-environment interactions. Akin to their cytoplasmic counterparts, polar localization of surface proteins is required in many contexts such as cell...

Flagella-like beating of actin bundles driven by self-organized myosin waves Par Pascal MARTIN - Physique des Cellules et Cance - UMR 168, Institut Curie, Paris Le 17 Décembre 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Wave-like beating of eukaryotic cilia and flagella - threadlike protrusions found in many cells and microorganisms - is a classic example of spontaneous mechanical oscillations in biology. This type ...

Séminaire interne Par Romain LEROUX - Frédéric JOUBERT Le 10 Décembre 2024 à 11h00 - Salle de séminaires 4ème étage - LJP - Tours 22-23 Active-matter droplets: patterns of an active filament by Romain Leroux Known as the cytoskeleton, networks of active biopolymers dynamically shape the cell membrane. Described by active ...

Fluctuations in dense active matter and applications to epithelial cell movements Par Yann-Edwin KETA (Lorentz Institute for Theoretical Physics, Leiden University, Netherlands) Le 2 Décembre 2024 à 14h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Active matter is an umbrella term which applies to a broad range of living and synthetic systems, composed of individual units each capable of consuming energy to perform motion, hence driving the ...

Non Equilibrium Transitions in a Template Copying Ensemble and from noisy cell size control to population growth Par Arthur GENTHON Le 26 Novembre 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Part 1: Non Equilibrium Transitions in a Template Copying Ensemble The fuel-driven process of replication in living systems generates distributions of copied entities with varying degrees of copying ...

Bacterial growth under confinement requires transcriptional adaptation to resist metabolite-induced turgor pressure build-up Par Daria Bonazzi Le 19 Novembre 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Bacterial proliferation often occurs in confined spaces, during biofilm formation, within hostcells, or in specific niches during infection, creating mechanical constraints. We investigated how ...

Prediction of neural activity in connectome-constrained recurrent networks Par Manuel Beiran Amigo, Center for Theoretical Neuroscience, Columbia University, NY Le 12 Novembre 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Establishing links between the connectivity of large neural networks and their emergent function is a major goal of neuroscience. In this talk, I will explain a theory of connectome-constrained ...

Séminaire interne. Par Léo Régnier and Elie Wandersman Le 5 Novembre 2024 à 11h00 - Salle de séminaires 4ème étage - LJP - Tours 22-23 See English version of the webpage.

Osmotic control of nuclear size and the N/C ratio in fission yeast Par Joël LEMIERE, Department of Cell and Tissue Biology, University of California, San Francisco Le 22 Octobre 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 The size of the nucleus scales robustly with cell size so that the nuclear-to-cell volume ratio (N/C ratio) is typically maintained as a constant in many cell types. Previous studies show that the N/C...

Séminaire des nouveaux entrants. Par TBA Le 8 Octobre 2024 à 11h00 - Salle de séminaires 4ème étage - LJP - Tours 22-23 TBA

Electrodiffusion models of synaptic potentials in dendritic spines Par Thibault LAGACHE, Institut Pasteur – Department of Cell Biology & Infection – BioImage Analysis Le 1 Octobre 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 The biophysical properties of dendritic spines play a critical role in neuronal integration but are still poorly understood, due to experimental difficulties in accessing them. Spine biophysics has ...

Force sensing in plants with mechanosensitive channels Par Jean-Marie FRACHISSE, Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198, Gif-sur-Yvette, France Le 24 Septembre 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Plants, like all living organisms, are subject to mechanical forces either from their environment or from within their own bodies. For example, when the root encounters obstacles in the soil, or when ...

Two problems in microfluidics inspired by biology Par Gabriel AMSELEM - LadHyX - Ecole Polytechnique, Palaiseau Le 17 Septembre 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 I will present two topics we are currently working on in the lab. The first one concerns fluidic networks, which are pervasive in all clades of biology, from the vasculature of animals and plants to ...

Séminaire interne. Par Internal Seminar: Leonardo Demarchi, Silvia Grigolon Le 10 Septembre 2024 à 11h00 - Salle de séminaires C404, 4ème étage, bâtiment C, IBPS See English version of the webpage.

Biologie Théorique Par Workshop SU-INRIA Le 10 Septembre 2024 à 09h00 - Salle de séminaires 4ème étage - LJP - LIFT Campus Jussieu - T 22-32- 4e et. - P407 Programme workshop du mardi 10 au campus de Jussieu, salle 407, couloir 22-32, 4ème étage.        9h15: introduction   9h30: Martin Weigt: modèles ...

Uncovering and leveraging design principles in Boolean models of gene regulatory networks Par Ajay Subbaroyan, The Institute of Mathematical Sciences, Tamil Nadu, India Le 16 Juillet 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Boolean networks (BNs) are a well-established framework for modeling the dynamics of gene regulatory networks (GRNs). In Boolean GRNs, genes can be either "on" or "off", with their dynamics dictated ...

Community transitions and the emergence of alternative stable states in microbial systems Par Daniel Amor , ENS Physics Department, Paris Le 2 Juillet 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Microbial communities often face external perturbations that can induce lasting changes in their composition and functions. Responses to such perturbations can drive community functions, including ...

Bacteria exploring Newtonian and non-Newtonian complex fluids: from behavioral variability to medium assisted tumbling Par Eric Clément, PMMH-ESPCI-PSL, Sorbonne University, University Paris-Cité, Paris Le 25 Juin 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 Understanding the way motile micro-organisms such as bacteria explore their environment is central to many ecological, medical and biotechnological issues. Here, I will present recent advances on the ...