"Managers and the Cultural Transmission of Gender Norms" | Trang Nguyen (Northwestern Kellogg)

Speaker: Saverio E. Spagnolie (University of Wisconsin-Madison)Title: Active matter in complex fluidsAbstract:Microorganisms often navigate environments with unique and counterintuitive physics, with significant consequences for evolutionary biology and human health. For example, mucus is both viscoelastic and anisotropic, profoundly influencing locomotion. This can be advantageous, as for mammalian spermatozoa swimming through cervical fluid, or detrimental, as with the Lyme disease spirochete Borrelia burgdorferi traversing the extracellular matrix of human skin. Complex fluid phenomena can also enhance or retard a microorganism's swimming speed, and can even change the direction of swimming, depending on the body geometry and the properties of the fluid. Analytical and numerical investigations of swimming in model viscoelastic (Oldroyd-B) and liquid-crystalline (Ericksen-Leslie) fluids will be discussed, emphasizing the critical and often dominant influence of nearby boundaries.Extending this work, we will then unify a broad spectrum of systems — from active suspensions in Newtonian fluids to individual active particles in confined or bulk complex flows — using three dimensionless parameters. The first is the Deborah number, which compares the timescales of particle activity and environmental relaxation; the second is a similar comparison but of length scales, which we term the Benes number; and the third is the active particle volume fraction. Motivated by this map to navigate towards new research areas, we will describe a mean-field theory describing the dynamics of active suspensions in bulk viscoelastic and anisotropic environments, predicting novel arrested states, traveling waves, and more dramatic thrashing modes.

Ten minutes for your mind@2:50 every day at 2:50 pm in multiple time zones:Europa@2:50, EET, Athens, Helsinki (UTC+2) (7:50 am EST) https://us02web.zoom.us/j/88298032734Atlantica@2:50, EST, New York, Toronto (UTC-4) https://us02web.zoom.us/j/85349851047Pacifica@2:50, PST, Los Angeles, Vancouver (UTC=7) (5:50 pm EST) https://us02web.zoom.us/j/85743543699Almost everything works better again if you unplug it for a bit, including your mind. Stop by and unplug. Get the benefits of mindfulness without the fuss.@2:50 meets at the same time every single day for ten minutes of quiet together.No pre-requisite, no registration needed.Visit the website to view all @2:50 time zones each day.at250.org or at250.mit.edu

Speaker: Bogdan Zavyalov (Princeton University)Title: The trace morphism and Poincaré duality in p-adic non-archimedean geometryAbstract:I will explain a construction of the trace morphism for smooth morphism of analytic adic spaces. Then I will explain how one can use this trace to prove various Poincare Duality type results. In particular, I will discuss a new easy proof of Poincare Duality for F_p-cohomology groups of smooth proper p-adic rigid-analytic spaces and an appropriate generalization of this result to arbitrary proper morphisms.

UEA Distinguished Speaker Series | Featuring Daron Acemoglu, Joshua Angrist, Abhijit Banerjee, Esther Duflo, and Bengt Holmstrom

Speaker: Geraldine Seydoux, John Hopkins School of MedicineHost: Yukiko YamashitaTitle: "A structural role for mRNAs in condensates?"The Biology Colloquium is a weekly seminar held throughout the academic year — featuring distinguished speakers in many areas of the biological sciences from universities and institutions worldwide. More information on speakers, their affiliations, and titles of their talks will be added as available. Unless otherwise stated, the Colloquium will be held live in Stata 32-123 (Kirsch auditorium) Contact Margaret Cabral with questions.