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 Events
U. Bath
Fri 20 Sep 2019, 3:00pm
Department Colloquium
ESB 1012
Rising Stars Colloquium - The motion of hybrid zones and genealogies in pushed waves
ESB 1012
Fri 20 Sep 2019, 3:00pm-4:00pm

Abstract

Suppose two populations with different genetic types live close to each other and can interbreed, but hybrid offspring have a lower evolutionary fitness. The interface between such populations is known as a hybrid zone. We can model this situation using a stochastic process. I will discuss a result on the motion of the interface, which is related to a well-known PDE result connecting the Allen-Cahn equation and mean curvature flow.

If we take a simplified model in only one spatial dimension, we can trace the ancestral lineages of individuals backwards in time and (in some cases) determine the asymptotic behavior of the genealogy (or family tree) of a set of individuals. Several interesting questions about the genealogies remain open.

Partly based on joint work with Alison Etheridge and Nic Freeman.

Note for Attendees

Refreshments will be served at 2:30 p.m. in ESB 4133 (Lounge).
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UBC Math
Fri 4 Oct 2019, 3:00pm
Department Colloquium
ESB 1012
TBA
ESB 1012
Fri 4 Oct 2019, 3:00pm-4:00pm

Abstract


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McGill University
Mon 7 Oct 2019, 3:00pm
Department Colloquium
TBD
TBD
TBD
Mon 7 Oct 2019, 3:00pm-4:00pm
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Cornell University
Fri 18 Oct 2019, 3:00pm
Department Colloquium
ESB 1012
(PIMS/UBC distinguished colloquium) TBA
ESB 1012
Fri 18 Oct 2019, 3:00pm-4:00pm

Abstract

 

Note for Attendees

Refreshments will be served at 2:30 p.m. in ESB 4133 (Lounge).
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UBC Math
Fri 25 Oct 2019, 3:00pm
Department Colloquium
ESB 1012
TBA
ESB 1012
Fri 25 Oct 2019, 3:00pm-4:00pm

Abstract


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Professor Melanie Matchett Wood
UC Berkeley
Fri 8 Nov 2019, 3:00pm SPECIAL
Department Colloquium
ESB2012
PIMS-UBC Distinguished Colloquium
ESB2012
Fri 8 Nov 2019, 3:00pm-4:00pm

Abstract

 
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Fri 15 Nov 2019, 3:00pm
Department Colloquium
ESB 1012
(reserved for PIMS UBC Mathematical Sciences Young Faculty Award)
ESB 1012
Fri 15 Nov 2019, 3:00pm-4:00pm

Abstract

A link to be provided later.
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Dept of Mathematics, University of Cincinnati
Fri 22 Nov 2019, 3:00pm
Department Colloquium
ESB 1012
Microswimmers propelled by helical flagella: Modeling, Simulations & Analysis
ESB 1012
Fri 22 Nov 2019, 3:00pm-4:00pm

Abstract

 Swimming bacteria with helical flagella are self-propelled micro-swimmers in nature, and the swimming strategies of such bacteria vary depending on the number and the position of flagella on the cell body. In this talk, I will introduce two microorganisms, multi-flagellated E. coli and single-flagellated Vibrio A. The Kirchhoff rod theory is used to model the elastic helical flagella and the rod-shaped cell body is represented by a hollow ellipsoid that can translate and rotate as a neutrally buoyant rigid body interacting with a surrounding fluid. The hydrodynamic interaction between the fluid and the bacteria is described by the regularized version of Stokes flow. I will focus on how bacteria can swim and reorient swimming course for survival and how Mathematics can help to understand the swimming mechanism of such bacteria.

 

 

Keywords: Fluid-structure interaction, Bacterial flagellar propulsion, Polymorphic transformation, Buckling instability


Note for Attendees

 Refreshments are served at PIMS before the Colloquium
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