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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 27 février 14:00-15:30 - Bérengère ABOU - Laboratoire Matière et Systèmes Complexes, Université Paris Diderot

    Microrheology of Insects Adhesive Secretion

    Résumé : Smooth and hairy adhesive pads of insects are covered with a secretion, produced in an extremely small quantity. I present microrheology experiments of insects adhesive secretion. In the case of the Colorado potato beetle, I will discuss the influence of the secretion rheology on the observed insect pace.



    contact : Thomas Podgorski

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


  • Lundi 6 mars 14:00-15:30 - Stéphanie Pitre-Champagnat - IR4, Orsay

    Flow of Ultrasound Contrast Agents in a Tumor : A Numerical Modeling Approach

    Résumé : Dynamic Contrast-Enhanced Ultrasonography (DCE-US) is a particularly attractive method to assess tumor microvasculature from the quantification of ultrasound contrast agents (CA) within lesion. This method does not yet benefitfrom methodological tools imported from physics, in particular the numerical modeling to study this multiparametric problem at a micrometer scale is hardly accessible by experimentation. In this context, I will present the first work of the team to model the dynamic of the ultrasound contrast agents within a simple vascular network and evaluate the reliability of the various methods of quantification of tumor vasculature.



    contact : Gwennou Coupier

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


  • Lundi 13 mars 14:00-15:30 - Philippe Coussot - laboratoire Navier, UMR 8205 CNRS, ENPC-ParisTech, IFSTTAR, Université Paris-Est à Champs- sur-Marne

    Recent Applications of MRI for the Study of Transfers in Porous Media – Internal Quantification of the Dynamics of Drying, Colloid Transport, Dispersion, Phase Transfers, Complex Fluid Flows

    Résumé : Liquid, ion or particle transport, or transfers between phases, inside civil engineering materials, play a critical role in their properties or their durability. Magnetic Resonance Imaging (MRI) allows to « visualize » the liquid phase within these non-transparent materials, but by using specific sequences it can also provide information on the liquid state, its motion, or even its interactions with the environment. More precisely, recent developments in that field, in particular in our lab, thus make it possible to measure the velocity field, the statistical distribution of velocities, the distribution of liquid states in time (e.g. bound or free water), the concentration distribution of suspended elements, etc. These information provides a straightforward quantification of various phenomena and sometimes leads to question usual assumptions based on macroscopic observations. I will present a few examples : homogeneous desaturation in drying nanoporous systems, subflorescence dramatically slowing down plaster drying, direct internal measurements showing lower dispersion than assumed so far, direct observation of colloid transport and adsorption in model soils, liquid transfers inside a composite concrete, peculiar characteristics of wood imbibition, breakage of the non-Newtonian characteristics of yield stress fluids flowing through a porous medium.



    contact : Elise Lorenceau

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


  • Lundi 20 mars 14:00-15:30 - Olivier Baledent - Reims

    LIPHY Seminar

    Résumé :



    contact : Mourad Ismaïl

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


  • Lundi 27 mars 14:00-15:30 - Céline Labouesse - Stem Cell Institue, Cambridge

    LIPHY Seminar

    Résumé :



    contact : Pierre Recho

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


  • Lundi 3 avril 14:00-15:30 - Marcel Lauterbach - MPI for Brain Research, Frankfurt, Germany

    LIPHY Seminar

    Résumé :



    contact : Aurélie Dupont

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


  • Lundi 15 mai 14:00-15:30 - Marc Barthelemy - CEA, Paris

    LIPHY Seminar

    Résumé :



    contact : Chaouqi Misbah

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


  • Lundi 29 mai 14:00-15:30 - Maria Consiglia Merola - Stanford University, USA

    Viscoelastic properties of corneal epithelial cells using the “Linear Cell Monolayer Rheometer”

    Résumé : Mechanical properties of cells are determined by complex intracellular structures. In other words, there is a strong connection between biological processes and cellular mechanical response to external stimuli. In fact, cells’ interactions with their living environment are affected by their own mechanical behavior during biological deformations. These interactions, notably adhesion, are crucial to understand the cells adaptation in presence of artificial material such as contact lenses or medical devices.
    During the last decades, different experimental techniques have been used to investigate cell mechanics. Among them, we can mention atomic force microscopy (AFM) and microrheology. While they present a great interest, these techniques are however limited since they can only probe a single cell. In order to overcome the challenges with the biological variation between individual cells, new technologies are thus necessary.
    In this work, we present measurements using a purpose made Linear Cell Monolayer Rheometer (LCMR) that can characterize averaged cell mechanics or averaged cell adhesion. The LCMR enables the investigation of biologically active layers : controlled amounts of live cells with or without artificial materials (e.g., contact lenses). It is used in this study to measure the mechanics of corneal epithelial cells in order to characterize how these cells mechanically deform to external stimuli.
    To simulate physiological conditions, cell mechanics is quantified in experiments in which cells are strained tangential to the cell monolayer. Time-dependent step-strain tests are used to determine the mechanical relaxation of the cell layers.
    The quantification of cell mechanics using the LCMR has the potential for multiple biomedical applications, including disease diagnosis and drug-efficacy screening.



    contact : Claude Verdier

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


  • Lundi 12 juin 14:00-15:30 - Kaare Jensen

    LIPHY Seminar

    Résumé :



    contact : Jean-François Louf

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


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