Accueil >
Production scientifique


(7) Presentation(s) - Année 2025
|
|
Lun. 20/01/2025 14:00 autre Soutenance de HDR
CASANELLAS VILAGELIU Laura (L2C)
Soft matter under flow: from model fluids to biomimetic tissues (Bat. 20)
|
|
|
Mer. 22/01/2025 10:00 autre Séminaire
GRANER Francois (Matière et Systèmes Complexes CNRS & Université Paris-Cité)
Collective migration of epithelial cells : from animal to lab, and back (Bat.20)
Sommaire:
The fruit fly larva is a maggot which looks like a dull white
cylinder. Within a few days, and without any changes in its genome
sequence, it metamorphoses. It gets its sophisticated adult fly shape
with wings, legs, antennas, and compound eyes. How do cells migrate,
deform, and rearrange to shape a tissue ?
To approach step by step the dynamics of this morphogenesis, we will
journey from developmental biology to mechanics, from discrete
description of cellular material to continuum mechanics
quantification, and from experiments to modeling. We will investigate
flows within geometries specifically designed to discriminate between
models. Pour plus d'informations, merci de contacter Casanellas vilageliu L.
|
|
|
Mer. 29/01/2025 09:45 autre Colloquium
FARDIN Marc-Antoine (Institut Jacques Monod, Université Paris Diderot)
Amphi Bâtiment 20
Radical scaling: beyond our feet and fingers
Sommaire:
The most common numeral system is decimal, based on our ten fingers, but countless other systems exist and have been used throughout history. They use a different "base" or "radix". Traces of these alternative systems are still present today: when we buy a dozen eggs, use base 24 and 60 for timekeeping, or hear a French speaker say ``four-twenty four'' to mean eighty-four, a vestige of a vigesimal (base-20) system. We use our fingers to count in the same way that we may use our feet to measure lengths. We rely on these anthropocentric standards to communicate, but we expect natural phenomena to be independent of the language we speak, the metrics we choose, and even the kind of numbers we use. Both numbers and units should be informed by nature, not human conventions. To illustrate this radical idea, I will explore examples from the capillary dynamics of droplets and bubbles, and from explosions—two classical subjects of scaling. Starting with a single power law, I will show that its eventual breakdown is actually a necessity if the associated phenomenon is to be independent of our human imprint. No power law can extend indefinitely. Pour plus d'informations, merci de contacter Poy G.
|
|
|
Mer. 29/01/2025 14:30 autre Séminaire
PIEROBON Paolo (Institut Cochin, CNRS UMR8104, INSERM U1016, Université Paris Cité - Team Dynamics of Cytoskeleton-dependent Responses of Immune Cells (DyCRIC))
Amphithéatre de Physique - Bat. 20
Mechanics of Immune Cells (Matière Molle & Verres)
Sommaire:
Immune cells, particularly lymphocytes, must move, interface with other cell types, extract information from these interactions, and, if necessary, respond rapidly through endocytosis, status changes, proliferation, or cell killing. These critical biological processes rely on cytoskeletal rearrangement, mechanical sensing, and force production.
In our research, we use microfluidics and micro-fabricated tools to investigate the forces at cell-cell interfaces and the cellular rearrangements triggered by antigen recognition. Recently, we introduced functionalized oil droplets as a novel antigen-presenting tool in the context of B cells, uncovering an unexpected role of microtubules in limiting F-actin polymerization, which facilitates the formation and maintenance of a distinct immune synapse.
Additionally, I will present new applications of these methods, focusing on lymphocyte interactions with the microenvironment of lymph nodes and examining how mechanical factors influence their
immune functions. Pour plus d'informations, merci de contacter Parmeggiani A.
|
|
|
Jeu. 30/01/2025 14:00 autre Soutenance de HDR
RAGUIN Adélaïde (Institute for Computational Cell Biology Heinrich-Heine University - Düsseldorf Germany)
Attention lieu inusuel: Amphi 36.01
Biophysical modelling of complex biological systems and their stochastic dynamics at the mesoscopic scale (Physique Théorique)
Sommaire:
Our work is characterised by its interdisciplinarity, at the interface
of Physics with Biology and Computer Sciences. It aims at highlighting how in silico experiments based on statistical Physics principles and intensive simulations allow answering targeted applied questions of high impact in domains ranging from plant biotechnology to human metabolism.
We focus on complex coarse-grained macromolecular systems and
non-equilibrium and non-linear phenomena. With our approach based on kinetic Monte Carlo simulations, we mainly investigate two types of systems: i) one-dimensional and unidirectional transport processes (e.g. the cytoskeletal transport, and the translation of mRNAs by ribosomes), and ii) the emergence of complex three-dimensional polysaccharidic structures (e.g. starch, glycogen, and lignocellulose) resulting from either synthesising or degrading enzymatic activities. Pour plus d'informations, merci de contacter Parmeggiani A.
|
|
|
Mar. 18/02/2025 11:30 Salle RdC, Bâtiment 11, RdC (à confirmer) Séminaire
ROCHEFORT Alain (Polytechnique Montréal, Département de génie physique, Montréal, Canada)
Propriétés électroniques et magnétiques de graphène Kagomé (Nanostructures & Spectroscopie)
Sommaire:
Propriétés électroniques et magnétiques de graphène Kagomé
Alain Rochefort
Polytechnique Montréal, Département de génie physique, Montréal, Canada
Résumé
La formation de polymères Kagomé avec des propriétés qui s’apparentent à celles du graphène a récemment généré de nombreux travaux sur ce type de matériau 2D aux propriétés parfois exotiques telles que des phases topologiques, des structures de bandes plates ainsi que des phases magnétiques liées à la structure des monomères. Dans cette présentation, je montrerai différents exemples de matériaux pouvant être produits par une approche de synthèse de surface (OSS) qui possèdent des propriétés électroniques et magnétiques prometteuses et pour lesquelles nous proposons également différentes approches pour moduler ces propriétés. Je montrerai également comment la symétrie des unités de base du polymère est au centre du contrôle de ces propriétés. Pour plus d'informations, merci de contacter Metz R.
|
|
|
Jeu. 15/05/2025 14:00 Salle des Séminaires, Bâtiment 21, Etage 4 (à confirmer) Séminaire
MARKOU Chrysoula (Scuola Normale Superiore (Pisa))
Candidate au CNRS (section 02)
(Théorie des Interactions Fondamentales)
|