Colloquium Schedule

Colloquium: Thursday, March 22, 4:10 PM, Lewis Lab 316

The Spectrum of Efficient Venation Phenotypes

Eleni Katifori

Assistant Professor
University of Pennsylvania

Life above a certain size relies on a circulatory system for oxygen and nutrient delivery. Without it, no complex animal would exceed a few millimeters: by diffusion alone, oxygen would not be able to travel more than 100μm in the tissue. Plants, animals and fungi have developed circulatory systems of striking complexity to solve the formidable problem of nutrient delivery and waste removal. Typically, biological transport networks have to satisfy competing demands to operate efficiently and robustly while confronted with an ever-changing environment. The architecture of these networks, as defined by the topology and edge weights, determines how efficiently the networks perform their function. In this talk we present some general models regarding the emergence and function of biological transport networks, from the reticulate vascular architecture of the leaf, to the hierarchies of the veins and arteries in our brain. We demonstrate that the network topologies generated by adaptation represent a trade-off between optimizing power dissipation, construction cost, and damage robustness. We identify the Pareto-efficient front and eventually the spectrum of venation phenotypes that evolution is expected to favor and select. Next, inspired by hemodynamic fluctuations in the brain, we examine how a network can dynamically adapt to reroute flow to prescribed network locations. In particular, we investigate how many simultaneous functions a given network can be programmed to fulfill and we uncover a phase transition that is related to other constraint-satisfaction transitions.
Click Here for full announcement

Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:10 PM in Lewis Lab room 316. Refreshments and snacks are available in the nearby coffee room at 3:45 PM.


Physics Colloquium Schedule for SPRING 2018

Click on Title below for past or upcoming Announcements (where available), and Speaker name for website.        

January 25Chinedu EkumaNaval Research Lab.Computational Capabilities and Concepts for 21st Century Materials and Applications
February 1Brandon AndersonUniv. of ChicagoEngineering Novel Many-Body States in Modulated Condensates
February 8Ryan MishmashPrinceton Univ.Uncovering and Exploiting Emergent Phenomena in Quantum Matter: From Fermionic Spinons to Majorana Fermions
February 15Arghavan Safavi-NainiJILA, NIST, UC BoulderThere and Back Again with Trapped-Ions
February 22Bitan RoyMax Planck Instit. DresdenTopology: A New Viewpoint of Condensed Matter Physics
February 27Jordan HorowitzMITThermodynamic Limits Far from Equilibrium
March 8Gary BernsteinU. PennResults from the Dark Energy Survey
March 15NO COLLOQUIUMSpring Break-
March 22Eleni KatiforiU. PennThe Spectrum of Efficient Venation Phenotypes
March 29           (Feigl Lecture)Steven SquyresCornell Univ.Roving Mars: Spirit, Opportunity and the Exploration of the Red Planet
April 5Andrew StromingerHarvard-
April 12Gino SegreU. PennEnrico Fermi: Architect of the Atomic Age
April 19Waseem BakrPrincetonQuantum Gas Microscopy of Atomic Fermi-Hubbard Systems
April 26Marko ZgonikU. of Ljubljana-
May 3Robert AustinPrinceton-
May 10---