Institut für Theoretische Physik
Start / Aktuell
April  2015
Mo
20.04.2015
Seminarraum A.04.101
Theoretische Physik
14:15
Quantenfeldtheorie (Forschungsseminar M.Phy.412)

alle

Vorbesprechung



Kontakt: K.-H. Rehren
Mo
20.04.2015
Max-Born-Hörsaal (HS2), Friedrich-Hund-Platz 1
Fakultät für Physik
16:30
Göttinger Physikalisches Kolloquium

Dr. Florian Rehfeldt
Uni Göttingen

Cell-Matrix-Mechanics Dictates Stem Cell Fate via Cytoskeleton Structure

The mechanical properties of microenvironments in our body vary over a broad range and are as important to cells as traditional biochemical cues. An especially striking experiment of this mechano-sensitivity demonstrated that systematic variation of the Young’s elastic modulus E of the substrate can direct the lineage differentiation of human mesenchymal stem cells (hMSCs). To elucidate the complex interplay of physical and biochemical mechanisms of cellular mechano-sensing, well-defined extracellular matrix (ECM) models are essential. While elastic substrates made of poly-acrylamide (PA) are widely in use, they have the potential drawback that the precursors are cytotoxic and therefore do not allow for 3D culture systems. Here, a novel biomimetic ECM model based on hyaluronic acid (HA) was successfully established that exhibits a widely tuneable and well-defined elasticity E, enables 2D and 3D cell culture and enables us to mimic a variety of distinct in vivo microenvironments. Quantitative analysis of the structure of acto-myosin fibers of hMSCs on elastic substrates with an order parameter S, reveals that the stress fiber morphology is an early morphological marker of mechano-guided differentiation and can be understood using a classical mechanics model. Furthermore, the cytoskeleton also dictates the shape of the nucleus and lends support to a direct mechanical matrix-myosin-nucleus pathway.

Di
21.04.2015
Auditorium MPS
MPI für Sonnensystemforschung
11:00
Solar-Seminar

David Bühler
MPS

Formation of a solar H-alpha filament from penumbra-like structures



Di
21.04.2015
Seminarraum A3.101
Theoretische Physik
14:15
Theoretisch-physikalisches Seminar

Tanja Schilling
Universite du Luxembourg

Crystallization and Percolation Revisited



Mi
22.04.2015
MPS - Auditorium
MPI für Sonnensystemforschung
11:00
Planetary-Seminar

Marc Hofmann
MPS

Regolith avalanche – small scale impacts as trigger mechanism

Landslides and mass wasting are ubiquitous on asteroid surfaces. The trigger mechanisms causing these avalanches are not always obvious. We examine the slow impact of small projectiles with regard to their potential to trigger a landslide in an atmosphereless low gravity environment. The trigger efficiency of small projectiles (diameters = 2mm) impacting different granular materials at slow speeds (0.5 – 2 m/s) was investigated with a set of experiments conducted at the ZARM drop tower facility in Bremen. Additional simulations with the Discrete Element Method (DEM) code ESyS Particle were done to better understand the microphysical mechanisms at play during such an impact. We find that these small scale impacts can, under certain conditions, trigger avalanches on asteroids and are thus influencing the surface exposed to remote sensing instruments.

Kontakt: Urs Mall
Mi
22.04.2015
Seminarraum A 03.101
Theoretische Physik
12:00



Kontakt: Marcus Müller
Mi
22.04.2015
Auditorium MPS
MPI für Sonnensystemforschung
14:00
S3-Seminar

Nathalie Themeßl
IMPRS

Asteroseismology of Red Giants in Eclipsing Binaries



Kontakt: Sonja Schuh
Mi
22.04.2015
Auditorium MPS
MPI für Sonnensystemforschung
14:30
S3-Seminar

Dan Yang
IMPRS

Helioseismic Holography



Kontakt: Sonja Schuh
Do
23.04.2015
Sitzungssaal Mathematik
Theoretische Physik
15:15
Graduiertenkolleg 1493

Gian Michele Graf
ETH Zürich

TBA



Kontakt: K.-H. Rehren
Fr
24.04.2015
Max-Born Lecture Hall
Fakultät für Physik
15:00
Event

Öffentliches Sonderkolloquium

25 Jahre Hubble-Weltraumteleskop

Am 24. April 2015 befindet sich das Hubble-Weltraumteleskop (HST) seit 25 Jahren im aktiven Betrieb in einer Umlaufbahn um die Erde und ist weiterhin eines der wichtigsten und erfolgreichsten Instrumente für die astrophysikalische Forschung.

In einer gemeinsamen Veranstaltung des Förderkreis Planetarium Göttingen, des Instituts für Astrophysik und der Fakultät für Physik sollen die wichtigsten Entdeckungen des Hubble-Weltraumteleskops vorgestellt und an einigen Beispielen erläutert werden, wie Beobachtungen mit dem Hubble-Weltraumteleskop zu aktuellen Forschungsarbeiten Göttinger Wissenschaftler beitragen.

Im Anschluss wird ein von NASA und ESA produziertes Großposter einer spektakulären Himmelaufnahme des HST enthüllt.


Ältere Veranstaltungen im    Archiv
D A P H N E    by Holm


Last modified: Mon Mar 5 10:17:50 CET 2012