Talks, Colloquia

17:00 Uhr KIP, INF 227, Otto-Haxel-Hörsaal
Prof. Dr. Joachim Spatz MPI for Medical Research, Dept. Cellular Biophysics & University of Heidelberg, Dept. Biophysical Chemistry

Mechanism in Collective Organisations of Living and Synthetic Cells

Regulating the emergence of leading individuals is a central problem to collectively migrating biological entities. For example, leaders in the mobile animal groups arise through collective decision making of the followers. However, the fundamental control of leader selection remains unclear in the physiologically relevant collective migration of epithelial cells. Here we present that the selective emergence of leader cells at the epithelial wound-margin depends on the dynamics of the follower cells and is spatially limited by the length-scale of collective force transduction. Owing to the dynamic heterogeneity of the monolayer, cells behind the prospective leaders manifest locally increased traction and monolayer stresses much before these leaders display any phenotypic traits. Once formed, the territory of a leader can extend only to the length up-to which cells can pull on their neighbors. These findings provide a novel mechanobiological-insight into the hierarchy in cell collectives during epithelial wound healing.

17:00 Uhr Neues Physikalisches Institut INF 226, Konferenzraum 1-3 (Room 00.101 bis 00.103)
Dr. Constanze Hasterok MPI für Kernphysik, Heidelberg

The XENON1T experiment: Latest results on dark matter searches and first observation of double electron capture of 124Xe

17:00 Uhr Kirchhoff-Institut, INF 227 SR 1.403, SR 1.403
Giacomo Roati INO - Istituto Nazionale di Ottica Florence, Italy

Out-of-equilibrium dynamics of atomic Fermi gases quenched to strong repulsion

16:15 Uhr Philosophenweg 12, großer Hörsaal
Adam Leroy Ohio State University (USA)

Surveying the Physical State of Cold Gas in Nearby Galaxies in the ALMA Era

Stars form in cold, dense clouds of molecular gas. This gas spans a wide range of density, pressure, composition, and dynamical state, and these properties affect how interacts with the galaxy and forms stars. Until the last few years, surveying this gas in other galaxies has been mostly restricted to coarse inventories, with little information on the physical properties of the gas. As a result, we so far lack a full, observationally-tested theory of cold gas in galaxies that spans cloud formation, star formation, and stellar feedback. Over the last few, the Atacama Large Millimeter/submillimeter Array (ALMA) and upgraded facility like NOEMA have begun to change this situation. I will describe how a new generation of surveys are resolving the physical properties of gas - density, pressure, evolutionary state, and detailed relation to stars and other gas phases - across many galaxies. I will highlight results from the ongoing PHANGS-ALMA survey and the recently completed EMPIRE survey that both show a strong dependence of cold gas properties on host galaxy and dynamical environment within the galaxy.