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04
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TBA
By Mathieu RIVIERE - Laboratoire IUSTI, Aix-Marseille Université, France
March 4, 2025 at 11:00AM - Jean Perrin Laboratory - Jussieu Campus - Towers 22-32 - 4th floor. - Room 407
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06
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TBA
By Joshua Ricouvier
March 6, 2025 at 10:00AM - zoom
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11
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TBA
By Laura CANTINI - Institut Pasteur - CNRS UMR 3738 - Paris
March 11, 2025 at 11:00AM - Jean Perrin Laboratory - Jussieu Campus - Towers 22-32 - 4th floor. - Room 407
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18
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TBA
By Ludovic JAMI - Laboratoire INPHYNI, Nice, France
March 18, 2025 at 11:00AM - Jean Perrin Laboratory - Jussieu Campus - Towers 22-32 - 4th floor. - Room 407
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Previous seminars
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Dynamics of motile bacterial suspensions: reaction to oxygen and interaction with passive particles
By Julien BOUVARD - Living Systems Institute, University of Exeter, UK
February 11, 2025 at 11:00AM - Jean Perrin Laboratory - Jussieu Campus - Towers 22-32 - 4th floor. - Room 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 ...
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Mechanics of living systems: pressing for answers
By Valentin LAPLAUD - Ladhyx, Ecole Polytechnique, France
February 4, 2025 at 11:00AM - Jean Perrin Laboratory - Jussieu Campus - Cassan Bar - Building C - 4th floor - Room 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 ...
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Development of physiologically-relevant microvessels for tissue engineering: when mechanics guides vessel formation
By Mathieu Hautefeuille - IBPS - Sorbonne-Université - Developmental Biology and Microphysiological Systems
January 28, 2025 at 11:00AM - Jean Perrin Laboratory - Jussieu Campus - Towers 22-32 - 4th floor. - Room 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 ...
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Towards emulsion-based functional materials: from stimulable polymer capsules to biomimetic programmable colloidal assemblies
By Lucas SIXDENIER - Dept. of Physics, New York University, New York, USA
January 27, 2025 at 04:00PM - 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 ...
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Forty years of Boltzmann machines and counting
By Rémi Monasson - LPENS
January 21, 2025 at 11:00AM - 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...
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How does a bacterial adhesin make up its MinD?
By Nicolas DESPRAT - Laboratoire de Physique de l'ENS - Paris
January 14, 2025 at 11:00AM - 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...
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Flagella-like beating of actin bundles driven by self-organized myosin waves
By Pascal MARTIN - Physique des Cellules et Cance - UMR 168, Institut Curie, Paris
December 17, 2024 at 11:00AM - 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 ...
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Internal seminar.
By Romain LEROUX - Frédéric JOUBERT
December 10, 2024 at 11:00AM - 4th floor seminar room - LJP - Tower 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 ...
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Fluctuations in dense active matter and applications to epithelial cell movements
By Yann-Edwin KETA (Lorentz Institute for Theoretical Physics, Leiden University, Netherlands)
December 2, 2024 at 02:00PM - 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 ...
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Non Equilibrium Transitions in a Template Copying Ensemble and from noisy cell size control to population growth
By Arthur GENTHON
November 26, 2024 at 11:00AM - 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 ...
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Bacterial growth under confinement requires transcriptional adaptation to resist metabolite-induced turgor pressure build-up
By Daria Bonazzi
November 19, 2024 at 11:00AM - 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 ...
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Prediction of neural activity in connectome-constrained recurrent networks
By Manuel Beiran Amigo, Center for Theoretical Neuroscience, Columbia University, NY
November 12, 2024 at 11:00AM - 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 ...
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Internal seminar.
By Léo Régnier and Elie Wandersman
November 5, 2024 at 11:00AM - 4th floor seminar room - LJP - Tower 22-23
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Random Walks Exploration and Starving, Léo Régnier
How long does it take for a tracer to reach a position ...
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Osmotic control of nuclear size and the N/C ratio in fission yeast
By Joël LEMIERE, Department of Cell and Tissue Biology, University of California, San Francisco
October 22, 2024 at 11:00AM - 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...
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Newcomers' seminar.
By TBA
October 8, 2024 at 11:00AM - 4th floor seminar room - LJP - Tower 22-23
TBA
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Electrodiffusion models of synaptic potentials in dendritic spines
By Thibault LAGACHE, Institut Pasteur – Department of Cell Biology & Infection – BioImage Analysis
October 1, 2024 at 11:00AM - 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 ...
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Force sensing in plants with mechanosensitive channels
By Jean-Marie FRACHISSE, Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198, Gif-sur-Yvette, France
September 24, 2024 at 11:00AM - 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 ...
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Two problems in microfluidics inspired by biology
By Gabriel AMSELEM - LadHyX - Ecole Polytechnique, Palaiseau
September 17, 2024 at 11:00AM - 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 ...
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Internal seminar.
By Internal Seminar: Leonardo Demarchi, Silvia Grigolon
September 10, 2024 at 11:00AM - C404 seminar room, 4th floor, building C, IBPS
Visuomotor control in virtually swimming fish, by Leonardo Demarchi
Understanding how the brain dynamically regulates behavior in response to a changing environment remains a fundamental question in ...
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Biologie Théorique
By Workshop SU-INRIA
September 10, 2024 at 09:00AM - 4th floor seminar room - 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 ...
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Uncovering and leveraging design principles in Boolean models of gene regulatory networks
By Ajay Subbaroyan, The Institute of Mathematical Sciences, Tamil Nadu, India
July 16, 2024 at 11:00AM - 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 ...
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Community transitions and the emergence of alternative stable states in microbial systems
By Daniel Amor , ENS Physics Department, Paris
July 2, 2024 at 11:00AM - 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 ...
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Bacteria exploring Newtonian and non-Newtonian complex fluids: from behavioral variability to medium assisted tumbling
By Eric Clément, PMMH-ESPCI-PSL, Sorbonne University, University Paris-Cité, Paris
June 25, 2024 at 11:00AM - 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 ...
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Internal seminar.
By Internal Seminar: Martin Garic, Joseph Ackermann
June 18, 2024 at 11:00AM - 5th floor seminar room - LJP - Tower 32-33
Multi-scale modeling of transport in the gut, by Martin Garic.The gastro intestinal tract is a complex biological system in which physical, bio-chemical and biological phenomena take place. Many ...
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Disorder-induced cooperative behaviour in aligning self-propelled particle systems
By Eloise Lardet - Imperial College London -UK
June 11, 2024 at 11:00AM - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5th Floor - 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 ...
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From perception to action without nerves and muscles: lessons from plants
By Yoel Forterre - Laboratoire IUSTI, UMR 7343 CNRS, Aix Marseille University
June 4, 2024 at 11:00AM - Laboratoire Jean Perrin - Campus Jussieu - T32-33, 5th Floor - 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...
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Three-dimensional “cellular ballons” or cysts: microfluidic formation, growth, deformability, instabilities.
By Pierre Nassoy - Laboratoire de Photonique Numérique et Nanosciences (LP2N) - Univ. Bordeaux - Talence
May 28, 2024 at 11:00AM - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5th Floor - 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 ...
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Deciphering the role of noise in cell shape changes during epithelial-to-mesenchymal transition
By Wolfram Pönisch - The University of Cambridge, UK
May 21, 2024 at 11:00AM - 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 ...
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Internal seminar.
By Nicolas Harmand and Nelly Henry
May 14, 2024 at 11:00AM - 5th floor seminar room - LJP - Tower 32-33
Merits and limits of surface and line tensions to account for the shape of epithelial cells. By Nicolas Harmand.
Building a physical framework to account for the shape of cells in epithelia is ...
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Shedding light on micro-algae: phototaxis-induced collective phenomena
By Raphaël Jeanneret - LPENS, Physics Department ENS
April 30, 2024 at 11:00AM - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5th Floor - 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 ...
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Programmable self-assembly of nanotubes using DNA origami colloids
By Daichi Hayakawa - Rogers Lab, Brandeis University
April 23, 2024 at 11:00AM - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5th Floor - 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 ...
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Internal seminar.
By Angelo Charry and Maxime Deforet
April 2, 2024 at 11:00AM - 5th floor seminar room - LJP - Tower 32-33
Modeling in vitro selection of binding proteins by Angelo CharryCurrently, directly measuring the physical properties of proteins, such as ligand-affinity and thermal stability, presents a challenge, ...
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Mechanics and polarity in B cells
By Paolo Pierobon (Institut Cochin, CNRS , Université Paris Cité)
March 26, 2024 at 11:00AM - Laboratoire Jean Perrin - Campus Jussieu - T 32-33 - 5th Floor - 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 ...
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Oriented flows in biological tissues
By Matthias Merkel (CPT, Marseille)
March 19, 2024 at 11:00AM - 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 ...
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Exploring Adaptive Collective Systems with Swarms of Learning Robots
By Nicolas Bredèche (ISIR, SU)
March 12, 2024 at 11:00AM - 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 ...
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Internal seminar
By Internal Seminar: Clément Nizak, Martin Maliet
March 5, 2024 at 11:00AM - 5th floor seminar room - LJP - Tower 32-33
Bacterial glass transition in Pseudomonas aeruginosa by Martin MALIETMotile bacteria self-organize in numerous collective phases, such as orientationally ordered phase or swarming state. Understanding...
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TBA
By Jeremy O'Byrne (LJP)
January 30, 2024 at 11:00AM - salle de séminaires 5ème étage - LJP - Tour 32-33
TBA
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Topology and robustness in early fate decision in the fly embryo
By Arghyadip Mukherjee (ENS Paris)
January 23, 2024 at 11:00AM - 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 ...
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Structured populations and other stories
By Alia Abbara (EPFL)
January 9, 2024 at 11:00AM - 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 ...
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TBA
By Samuel Bell (LJP)
December 19, 2023 at 11:00AM - 5th floor seminar room - LJP - Tower 32-33
TBA
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Constraining the immune system dynamics with a coevolving population: the HIV, flu and microbiome cases
By Andrea Mazzolini (LPENS)
December 5, 2023 at 11:00AM - 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...
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Can we program DNA reaction-diffusion fronts with molecular motors
By Nicolas Lobato-Dauzier (Laboratoire Jean Perrin, Sorbonne Université)
November 28, 2023 at 11:00AM - 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 ...
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Internal Seminar
By Internal Seminar: Matteo Dommanget-Kott, Jean-Christophe Galas
November 21, 2023 at 11:00AM - Salle de séminaires 5ème étage - LJPe
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Ecology of host and pathogen and limited predictability of evolution
By Pierre Barrat-Charlaix (PoliTo)
November 14, 2023 at 11:00AM - 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 ...
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Flexible selection of task-relevant features through population gating
By Joao Barbosa (ENS Paris)
November 7, 2023 at 11:00AM - 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 ...
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Internal Seminar
By Internal Seminar: Gaspard Junot, Georges Debregeas
October 24, 2023 at 11:00AM - Salle de séminaires 5ème étage - LJP
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