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DTSTART;TZID=America/New_York:20230316T130000
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DTSTAMP:20240215T111640Z
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SUMMARY:Active chemical reactions in phase-separating systems
DESCRIPTION:Active Matter Seminar \n  \n\n\nSpeaker:  Jonathan Bauermann\, Max Planck Institute for the Physics of Complex Systems \n\n\n\nTitle: Active chemical reactions in phase-separating systems \nAbstract: Motivated by the existence of membrane-less compartments in the chemically active environment of living cells\, I will discuss the dynamics of droplets in the presence of active chemical reactions. Therefore\, I will first introduce the underlying interplay between phase separation and active reactions\, which can alter the droplet dynamics compared to equilibrium systems. A key feature of such systems is the emergence of concentration gradients even at steady states. In the second part of this talk\, I will discuss how these gradients can trigger instabilities in the core of chemically active droplets\, giving rise to a new non-equilibrium steady state of liquid spherical shells. Finally\, I will present experimental and theoretical results discussing the existence and energetic cost of this non-equilibrium steady state in a coacervate system.
URL:https://cmsa.fas.harvard.edu/event/am-31623/
LOCATION:Virtual
CATEGORIES:Active Matter Seminar
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DTSTART;TZID=America/New_York:20230330T130000
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SUMMARY:The Role of Orientational Order in Development
DESCRIPTION:Active Matter Seminar\n\n\nSpeaker: Mark Bowick\, Kavli Institute for Theoretical Physics\, UCSB \nTitle: The Role of Orientational Order in Development \nAbstract: Morphogenesis\, the process through which genes generate form\, establishes tissue scale order as a template for constructing the complex shapes of the body plan. The extensive growth required to build these ordered substrates is fueled by cell proliferation\, which\, naively\, should disrupt order. Understanding how active morphogenetic mechanisms couple cellular and mechanical processes to generate order remains an outstanding question in animal development. I will review the statistical mechanics of orientational order and discuss the observation of a fourfold orientationally ordered phase (tetratic) in the model organism Parhyale hawaiensis. I will also discuss theoretical mechanisms for the formation of orientational order that require both motility and cell division\, with support from self-propelled vertex models of tissue. The aim is to uncover a robust\, active mechanism for generating global orientational order in a non-equilibrium system that then sets the stage for the development of shape and form.
URL:https://cmsa.fas.harvard.edu/event/am-33023/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Active Matter Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Active-Matter-Seminar-03.30.23.png
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