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Accueil > Recherche > Séminaires & Conférences > Séminaires au Laboratoire

Séminaires Invités

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Séminaires donnés par des invités extérieurs au LIPhy.

Ce sont des séminaires généraux qui s’adressent à tous les membres du LIPhy. Par conséquent, l’introduction, la plus large possible, y joue un rôle important.

Les séminaires durent environ 1heure dont 15mn accordées aux questions. Ils ont lieu les lundis à 14h, en salle de conférence du laboratoire au deuxième étage. La langue des séminaires est en général l’anglais.

L’accès au laboratoire peut-être obtenu en contactant le secrétariat.

Agenda

  • Lundi 19 novembre 14:00-15:30 - Mehdi Bouzid - LPTMS, CNRS, Univ. Paris-Sud, Univ. Paris-Saclay, France

    Mechanical Properties of Poorly Connected Soft Solids

    Résumé : Self-assembly and aggregation of soft condensed matter like proteins, colloids or polymers into poorly connected and weakly elastic solids is very common and ubiquitous in nature. Phase separation, spinodal decomposition as well as externally driven self-assembly or aggregation often lead to gels, which display diverse structures and solid-like mechanical features. The structural complexity of soft gels entails a versatile mechanical response that allows for large deformations, controlled elastic recovery and toughness in the same material. A limit to exploiting the potential of such materials is the insufficient fundamental understanding of the microstructural origin of the bulk mechanical properties. Investigating how the mechanical response depends on the material microstructure will provide a new rationale, which would ultimately lead to several applications, ranging from improving the performance of batteries (colloidal gels) to designing smart composites that can prevent the cascade of catastrophic events and can be used in anti-seismic buildings to many with important biological functions, such as new scaffolds for tissue engineering.
    In the first part of my talk, I will present a new highly efficient technique to probe the linear mechanical response of soft gels, as well as a minimal constitutive model. Then I’ll focus on the link between the topology of the network and the non-linear rheological response. I will show the relevance of our analysis to understand the mechanics of F-actin cytoskeleton under large deformations. Our study helps to clarify, the mechanism by which mutations cause podocyte dysfunction and progressive kidney disease in humans. Finally, I will present a new mechanism to account for the non-linear elasticity of a very sparsely, crucial, biologically connected gels : branched actin networks.



    contact : Eric Bertin

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 26 novembre 14:00-15:30 - Silvia Grigolon - Theoretical Physics of Biology Laboratory, The Francis Crick Institute, London

    Understanding the Mechanics of Coordinated Tissue Movements and Fluidisation-Mediated Spreading in Zebrafish Gastrulation

    Résumé : Embryo morphogenesis relies on highly coordinated movements of different tissues as well as cell differentiation and patterning. However, remarkably little is known about how tissues coordinate their movements to shape the embryo and whether and how dynamic changes in signalling and tissue rheology affect tissue morphogenesis. In zebrafish embryogenesis, coordinated tissue movements first become apparent during "doming", when the blastoderm begins to spread over the yolk sac, a process involving coordinated epithelial surface cell layer expansion and deep cell intercalations. In this talk, I will first present how using a combination of active-gel theory and experiments (performed by Dr. Hitoshi Morita, Yamanashi University, Japan) shows that active surface cell expansion represents the key process coordinating tissue movements during doming. I will then talk about the analysis of the intrinsic mechanical properties of the blastoderm at the onset of doming and how, by the aid of a simpler toy model and experiments (performed by Dr. Nicoletta Petridou, IST Austria), blastoderm movement relies on a rapid, pronounced and spatially patterned tissue fluidisation which is found to be linked to local activation of non-canonical Wnt signalling mediating cell cohesion.



    contact : Pierre Recho

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 17 décembre 14:00-15:30 - Jérôme MATHE - Laboratoire LAMBE – Université d’Evry val d’Essonne Group Matériaux Polymères aux Interfaces

    The Richness of the Eye of a Needle

    Résumé : It sounds difficult to thread a macromolecule through a nanoscale eye of a needle. It is in fact a quite easy task, thanks to the macromolecule physical properties. This principle of threading a polymer chain trough a nanoscale hole is used in the so-called nanopore technique. I will present this technique and its developments through diverse kinds of molecules’ analysis : going from polymers analysis, to DNA sequencing, via some polymer physics, nucleic acids unzipping or protein unfolding.
    These studies on the threading of a molecule in a nanopore in order to analyze its properties (shape, charge, structure, stability…) are not the only possibilities of this rich concept. I will thus finally show how the nanopores can be developed toward a powerful tool to produce or analyse nano-objects. One can, for instance, use it to form complexes involving single molecules.



    contact : Elise Lorenceau

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 14 janvier 2019 14:00-15:30 - Tanguy le Borgne

    LIPHY Seminar

    Résumé :



    contact : Gwennou Coupier

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 21 janvier 2019 14:00-15:30 - Sébastien Michelin

    LIPHY Seminar

    Résumé :



    contact : Benjamin Dollet

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 28 janvier 2019 14:00-15:30 - Mohamed Quafafou - Aix Marseille University

    On Perception and Accessibility

    Résumé :



    contact : Chaouqi Misbah

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Lundi 4 février 2019 14:00-15:30 - Boris THIBERT - Laboratoire Jean Kuntzmann, Université Grenoble Alpes

    Mirror and Lens Design for Nonimaging Optics

    Résumé : Nonimaging optics is a field of optics where one is interested in the transfer of light energy between a source and a target. Unlike traditional optics, or imaging-optics, the goal is not to reproduce an image of the input light, but to design optical components that transfer a given source light to a prescribed target light.
    In this talk, I show how the optimal transport theory can be used to design a different kinds of optical components that allow to transfer any punctual or collimated source to any target. I will also present fabricated mirrors and lenses.



    contact : Erik Kerstel

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


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