Séminaires

Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu (plan).

Contact :
Laurent Duchemin
Sylvain Patinet
Stéphane Perrard
Etienne Reyssat
responsables-seminaires (arobase) pmmh.espci.fr

PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France

Tel : (33) 1 40 79 45 22


Séminaire PMMH - Laurent Seuront (LOG, Wimereux))

Vendredi 14 octobre de 11h00 à 12h00 - Salle réunion PMMH 1

The Behavioral Mandala : a new step towards the understanding of the behavioural complexity behind invertebrates and vertebrates foraging strategies

Movement is a fundamental characteristic of life. It determines the fate of individuals through its influence on reproduction, feeding and survival, and ultimately populations, communities, and ecosystems. An important open question lies in the quantification of both the geometric and stochastic components of movement, their representation in the absence of extrinsic stimulus and their response to abiotic and biotic stressors. By analogy with the fundamental and realized niches of ecology sensu Hutchinson (1957), we introduce the fundamental and realized behavioral niches using the Behavioral Mandala. The Mandala is based on an explicit representation of the geometric and stochastic component of movement observed in the absence of extrinsic stimulus and in response to a range of representative stressors. Based on the behavior of organisms ranging from protists to humans, we show that the Behavioral Mandala provides a unifying approach to the problems of quantifying complexity in animal movement, through the identification of innate complexity and the quantification of changes in complexity due to external stimuli, thus allowing to compare the relative strengths of response behaviours across taxa and types of stimuli. Specifically, we show that the geometric and stochastic components of behavioral complexity are described in terms of fractals in both the absence and presence of extrinsic drivers. These results indicate that the Behavioral Mandala can be used to quantify objectively the behavioral complexity of virtually any moving animal, and fractal properties may be an inherent and adaptive aspect of the movement of animals, irrespective of their size, sex or taxon.

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Séminaires  (4)

  • Séminaire PMMH - Virgile Thiévenaz INRAE, PIAF, Clermont-Ferrand
    Vendredi 2 décembre de 11h00 à 12h00 - Salle réunion PMMH 1
    Pinch-off of complex suspensions drops
    Many fluids of our everyday life, from paint to concrete, actually contain solid particles suspended in a liquid. Applications such as inkjet printing require the fragmentation of such suspensions into droplets. Depending on the scale at which one looks at it, a suspension may seem homogeneous or heterogeneous. (...)
  • Séminaire PMMH - Emmanuèle Helfer (CINAM, Marseille)
    Vendredi 9 décembre de 11h00 à 12h00 - Salle réunion PMMH 1
    Biomimicking red blood cell filtration by the spleen
    Blood circulation in our vascular system is a physical tour de force. To distribute oxygen throughout the body, Red blood cells (RBCs) continuously travel through the microcirculation, through thin capillaries that are smaller than their size, and are thus highly deformable. Their deformability is periodically (...)
  • Séminaire PMMH - Valentin LAPLAUD (Ladhyx Polytechnique)
    Vendredi 20 janvier 2023 de 11h00 à 12h00 - Salle réunion PMMH 1
    Growth and mechanics of 'plants on a chip'
    Plant growth is a complex process depending in part on the hydraulics and mechanics of the plant cell, that has been modeled by Lockhart (1965) and Ortega (1985) using a description still used today. To study it experimentally at the cell and organism level we developed a microfluidic system to follow several (...)
  • Séminaire PMMH - Angela Limare (IPGP)
    Vendredi 24 mars 2023 de 11h00 à 12h00 - Salle réunion PMMH 1
    The Earth's mantle in a microwave oven : thermal convection driven by a heterogeneous distribution of heat sources
    Past laboratory experiments of thermo chemical convection have dealt with systems involving fluids with different intrinsic densities and viscosities in a Rayleigh-Bénard setup. Although these experiments have greatly improved our understanding of the Earth's mantle dynamics, they neglect a fundamental component of (...)

Instructions générales pour les conférenciers

Le public du séminaire est très hétérogène (rien qu’au PMMH nous travaillons sur des thématiques très diverses, mécanique des fluides, des milieux granulaires, des solides, physique statistique, physique du mouillage, micro-fluidique, biophysique,...) l’objectif est donc de ne pas faire un séminaire trop spécialiste : au moins la première moitié du séminaire à un niveau accessible pour celui qui ne connaît rien sur le sujet.

Le séminaire a lieu à 11h. rendez-vous 15 minutes avant pour installer et tester la projection.

Le séminaire dure environ 45 minutes pour laisser un peu de temps pour discuter à la fin.

Lien vers séminaires café (internes, tous les jeudis)


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Informations Pratiques

Laboratoire : 01 40 79 45 22
Directeur : Damien Vandembroucq
Codirecteur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel : dir (arobase) pmmh.espci.fr