Séminaires à venir

21 JAN

TBA Par Rémi Monasson - LPENS Le 21 Janvier 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 TBA

27 JAN

TBA Par Lucas SIXDENIER - Dept. of Physics - New York University - USA Le 27 Janvier 2025 à 16h00 - On Zoom TBA

28 JAN

TBA Par Mathieu Hautefeuille - IBPS - Sorbonne-Université - Developmental Biology and Microphysiological Systems Le 28 Janvier 2025 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 22-32- 4e et. - P407 TBA

04 FÉV

Séminaire interne. Par TBA Le 4 Février 2025 à 12h00 - Salle de séminaires 4ème étage - LJP - Tours 22-23 TBA

11 FÉV

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 - T 22-32- 4e et. - P407 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 ...

18 MAR

Séminaire interne. Par Ghislaine Morvan-Dubois and TBA Le 18 Mars 2025 à 11h00 - Salle de séminaires 4ème étage - LJP - Tours 22-23 TBA

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Séminaires passés

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 ...

Séminaire interne. Par Internal Seminar: Martin Garic, Joseph Ackermann Le 18 Juin 2024 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 See the English version of the webpage.

Disorder-induced cooperative behaviour in aligning self-propelled particle systems Par Eloise Lardet - Imperial College London -UK Le 11 Juin 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5e et. - P533 Flocking is a prime example of how robust collective behaviours can emerge from simple interaction rules. The famous Vicsek model displays a transition from disorder to flocking by varying different ...

From perception to action without nerves and muscles: lessons from plants Par Yoel Forterre - Laboratoire IUSTI, UMR 7343 CNRS, Aix Marseille University Le 4 Juin 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T32-33, 5e étage - P.531 As sessile organisms, plants face a constantly changing environment with no means of escape. Thus, despite their lack of nerves and muscles, they have evolved unique mechanisms to perceive and respond...

Three-dimensional “cellular ballons” or cysts: microfluidic formation, growth, deformability, instabilities. Par Pierre Nassoy - Laboratoire de Photonique Numérique et Nanosciences (LP2N) - Univ. Bordeaux - Talence Le 28 Mai 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5e et. - P533 Organoids are lumen-containing multicellular structures that recapitulate key features of the organs. We will first present a microfluidic technology that allows to produce them at high throughput in ...

Deciphering the role of noise in cell shape changes during epithelial-to-mesenchymal transition Par Wolfram Pönisch - The University of Cambridge, UK Le 21 Mai 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5e et. - P533 The development of an organism requires sequential state transitions towards more specialised cell types. Many state transitions coincide with changes in cell shape, with emerging evidence suggesting ...

Séminaire interne. Par Nicolas Harmand and Nelly Henry Le 14 Mai 2024 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 See English version.

Shedding light on micro-algae: phototaxis-induced collective phenomena Par Raphaël Jeanneret - LPENS, Physics Department ENS Le 30 Avril 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5e et. - P533 Motile micro-algae modify their environment by absorbing light, consuming and releasing chemical compounds and generating flows. Flows, light, and chemicals in turn influence their motion. These ...

Programmable self-assembly of nanotubes using DNA origami colloids Par Daichi Hayakawa - Rogers Lab, Brandeis University Le 23 Avril 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5e et. - P533 Nature is replete with self-assembled materials that have one or more self-limited dimensions, including shells, tubules, and fibers. Despite significant advances in making nanometer- and ...

Séminaire interne. Par Angelo Charry and Maxime Deforet Le 2 Avril 2024 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 Séminaire interne. Les résumés se trouvent sur la version anglaise de la page.

Mechanics and polarity in B cells Par Paolo Pierobon (Institut Cochin, CNRS , Université Paris Cité) Le 26 Mars 2024 à 11h00 - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5e et. - P533 B cells serve as the primary producers of antibodies within the immune system. To elicit an effective immune response, they must recognize and internalize antigens through a specialized signaling ...

Oriented flows in biological tissues Par Matthias Merkel (CPT, Marseille) Le 19 Mars 2024 à 11h00 - salle de séminaires 5ème étage - LJP - Tour 32-33 I will talk about two project involving oriented tissue flows. 1) Most animals display one or more body axes (e.g. head-to-tail, left-right, ventral-dorsal), which usually emerge during early ...

Exploring Adaptive Collective Systems with Swarms of Learning Robots Par Nicolas Bredèche (ISIR, SU) Le 12 Mars 2024 à 11h00 - salle de séminaires 5ème étage - LJP - Tour 32-33 I will give a brief overview of the research we are conducting on using robot swarms to study adaptive collective systems in the physical world. I will focus on (1) robot swarm to study physical ...

Séminaire interne Par Internal Seminar: Clément Nizak, Martin Maliet Le 5 Mars 2024 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 Séminaire interne.

TBA Par Jeremy O'Byrne (LJP) Le 30 Janvier 2024 à 11h00 - salle de séminaires 5ème étage - LJP - Tours 32-33 TBA

Topology and robustness in early fate decision in the fly embryo Par Arghyadip Mukherjee (ENS Paris) Le 23 Janvier 2024 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 During embryogenesis, the earliest cell fate decision is often linked to nuclear positioning, whose control arises from the integration of the cell cycle oscillator and associated cytoskeletal ...

Structured populations and other stories Par Alia Abbara (EPFL) Le 9 Janvier 2024 à 11h00 - salle de séminaires 5ème étage - LJP - Tour 32-33 A classical question in population genetics is to understand the spread of a mutant with a fitness advantage in a population, in  particular its fixation probability. This question has been ...

TBA Par Samuel Bell (LJP) Le 19 Décembre 2023 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 TBA

Constraining the immune system dynamics with a coevolving population: the HIV, flu and microbiome cases Par Andrea Mazzolini (LPENS) Le 5 Décembre 2023 à 11h00 - salle de séminaires 5ème étage - LJP - Tour 32-33 The adaptive immune system is an extremely complex machinery that continuously evolves to recognize and fight external pathogens. This chase is often made harder by the fact that pathogens also evolve...

Can we program DNA reaction-diffusion fronts with molecular motors Par Nicolas Lobato-Dauzier (Laboratoire Jean Perrin, Sorbonne Université) Le 28 Novembre 2023 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 Couplings between biochemical and mechanical processes have a profound impact on embryonic development. However, in-vitro studies capable of quantifying these interactions have remained elusive. I ...

Internal LJP Seminar Par Internal Seminar: Matteo Dommanget-Kott, Jean-Christophe Galas Le 21 Novembre 2023 à 11h00 - Salle de séminaires 5ème étage - LJP

Ecology of host and pathogen and limited predictability of evolution Par Pierre Barrat-Charlaix (PoliTo) Le 14 Novembre 2023 à 11h00 - salle de séminaires 5ème étage - LJP - Tour 32-33 Seasonal influenza viruses repeatedly infect humans in part because they rapidly change their antigenic properties and evade host immune responses, necessitating frequent updates of the vaccine ...

Flexible selection of task-relevant features through population gating Par Joao Barbosa (ENS Paris) Le 7 Novembre 2023 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 Brains can gracefully weed out irrelevant stimuli to guide behavior. This feat is believed to rely on a progressive selection of task-relevant stimuli across the cortical hierarchy, but the specific ...

Internal LJP Seminar Par Internal Seminar: Gaspard Junot, Georges Debregeas Le 24 Octobre 2023 à 11h00 - Salle de séminaires 5ème étage - LJP

Topological defects control morphogenesis of mesenchymal tissues in vitro Par Claire Dessalles (University of Geneva, Switzerland) Le 17 Octobre 2023 à 11h00 - Salle de séminaires 5ème étage - LJP - Tours 32-33 Morphogenesis, the process by which tissues acquire their shape, hinges on a finely orchestrated collective motion of cells autonomously choreographing themselves to a well-defined final position. ...

Learning and memory in adult zebrafish: Insights from the last 10 years of research Par Alexis Buatois Le 26 Septembre 2023 à 11h00 - salle de séminaires 5ème étage - LJP - Tour 32-33 Alexis Buatois (1) Institute of Neuroscience and Physiology, Department of Neurochemistry and Psychiatry, University of Gothenburg, Su Sahlgrenska, 41345, Göteborg, Sweden The zebrafish has...

Assessing the complexity of large ecological communities through the prism of disordered systems Par Ada Altieri (Université Paris Cité) Le 19 Septembre 2023 à 11h00 - salle de séminaires 5ème étage - LJP - Tour 32-33   In this talk, I will address some timely questions in theoretical ecology — from configurational landscape analysis to the long-standing diversity/stability debate up to the emergence of...