Seminars – University of Copenhagen

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Seminar by David R. Nelson, Lyman Laboratory, Harvard University

SEMINAR

 

At the Niels Bohr Institute, October 29th 2018, 14.15

All are invited to a StemPhys seminar by David R. Nelson from the Lyman Laboratory at Harvard University on Monday, October 29th 2018, 14:15. Building K, floor C room KC7.

Title: On Growth and Form of Microorganisms on Liquid Substrates

The interplay between fluid flows and living organisms plays a major role in the competition and organization of microbial populations in liquid environments.  Hydrodynamic transport leads to the dispersion, segregation or clustering of biological organisms in a wide variety of settings.  To explore such questions, we have created microbial range expansions in a laboratory setting by inoculating two identical strains of S. cerevisiae (Baker’s yeast) with different fluorescent labels on a nutrient-rich fluid 10^4  to10^5 times more viscous than water.  The yeast metabolism generates intense flow in the underlying fluid substrate several times larger than the unperturbed colony expansion speed.  

These flows dramatically impact colony morphology and genetic demixing, triggering in some circumstances a fingering instability that allows these organism to spread across an entire Petri dish in roughly 24 hours.  We argue that yeast colonies create fluid flow by consuming nutrients from the surrounding fluid, decreasing the fluid’s density, and ultimately triggering a baroclinic instability when the fluid’s pressure and density contours are no longer parallel.   Our results suggest that microbial range expansions on viscous fluids will provide rich opportunities to study the interplay between advection and spatial population genetics.


Previous Seminars

Seminar by Takuya Iida, September 24, 2018, 14:15 at The Niels Bohr Institute

SEMINAR

 

September 24, 2018, Takuya Iida

, Osaka Prefecture University, (OPU). Title: 

Development of On-demand Light-induced Acceleration System

Targeting Various Biological Samples.

All are invited to a StemPhys seminar, Monday, September 24, 2018, 14:15. Building K, floor C room KC7.

Click here for abstract and here for Takuya Iida's biography.

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Joint DanStem/NBI Seminar by Patrick Lemaire, August 23, 2018, 12:15 at Panum

SEMINAR

 

August 23, 2018, Patrick Lemaire, Montpellier Cell Biology Research Center, (CRBM) Title: Ensuring reproducible epidermal morphogenesis in ascidians: an active-reactive mechanical model.

All are invited to a joint DanStem and NBI seminar, August 23, 2018, 12:15. Victor Haderup Auditorium

The Danish National Research Foundation Center for Stem Cell Decision Making, StemPhys, an interdisciplinary initiative joining forces of physics and stem cell biology is hosting Patrick Lemaire, Montpellier Cell Biology Research Center, (CRBM) for a seminar 

Title: Ensuring reproducible epidermal morphogenesis in ascidians: an active-reactive mechanical model.

The  Lemaire group study the embryos of ascidians, a group of small marine invertebrates some of which are seen as delicacies in France and Japan. They chose this group of animals because the different species included in this group have very different genomes, but develop almost identically. To understand this apparent paradox, they combine fluorescent imaging approaches in live embryos, genome sequencing, classical embryology and computer modelling with a hope that this work will allow them to better understand the sometimes tortuous paths of species evolution.