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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

  • Mardi 18 décembre 14:00-15:30 - Benedikt SABASS - Institute of Complex systems, Forschungzentrum Jülich, Germany

    Bacterial Surface Migration : Force Measurement and Modelling

    Résumé : Generation and control of mechanical forces are essential for a wide range of bacterial behaviors including surface migration and colony formation and also play a role for infection by Gram-negative pathogens. Many bacteria employ retractable type-IV pili to generate these nanoscopic forces. Since it is difficult to measure such small forces in a perturbationless fashion, little is known about how bacteria regulate or adapt their force generation by pili.
    Here, I present experimental and theoretical studies of bacterial surface migration. First, I summarize a study of bacterial cell-substrate traction with Myxococcus xanthus as a model organism. Measurements show that during migration, individual type-IV pili exert forces around 50 pN deforming the substrate beneath the bacteria. However, when M. xanthus aggregates into groups, forces appear upregulated and pili exert more than twice the forces measured with individual cells. Nevertheless, pilus dynamics remain uncoordinated in groups leading to random tugging with autocorrelation times on the order of one minute.
    After discussing experimental findings, I present a model describing the effects of surface properties on bacterial migration. The model predicts a non-linear dependence of migration speed and mean square displacement on substrate properties, which is in accordance with experimental data. The essence of these effects is explained by an analytical theory.



    contact : Delpine Débarre

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


  • Lundi 7 janvier 2019 14:00-15:30 - Alan Parker - Rational Formulation

    Peanuts, rods, worms and trees : How do giant micelles evolve ?

    Résumé :



    contact : Catherine Quilliet

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


  • Jeudi 10 janvier 2019 14:00-15:30 - Felix ROOSEN-RUNGE - Division for Physical Chemistry, Lund University, Sweden

    Dynamics of Proteins in Crowded Solutions

    Résumé : Protein dynamics is of central importance for biological function. Examples include the dynamic-facilitated function of enzymes as well as diffusion-limited transport and reactions. A comprehensive understanding of protein dynamics is challenging, as it requires not only multiple dynamical levels, but also has to account for the crowded and multicomponent native environment.
    I will present an account of protein dynamics inspired by soft matter physics, combining neutron, light and X-ray scattering techniques with coarse-grained modeling. First, protein diffusion appears consistent with colloidal predictions on both the nanosecond and the microsecond time scale, allowing to use short-time self-diffusion obtained by quasi-elastic neutron scattering as a sensitive tool for assembly. Second, the internal dynamics of protein chains reacts on crowding and thermal stress. As a particular example, thermal denaturation and subsequent gel formation is reflected in changes on several hierarchical levels, which have been monitored in real-time.
    Based on these results, I discuss future potentials of the outlined approaches to study e.g. nanoscopic dynamics-structure relationships of macromolecules during assembly.



    contact : Judith Peters

    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


  • Lundi 18 février 2019 14:00-15:30 - Remy Colin

    LIPHY Seminar

    Résumé :



    contact : Philippe Peyla

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


  • Lundi 11 mars 2019 14:00-15:30 - Maxim Dolgushev

    LIPHY Seminar

    Résumé :



    contact : Chaouqi Misbah

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


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