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UID:2e1b6ca7f7fdb52d6beb7c86f5bbca54
CATEGORIES:Mathematical Finance and Probability Seminars
CREATED:20250915T132002
SUMMARY:Webinar: David Nelson -  Turbulent Mixing and Antagonistic Microorganisms
LOCATION:Zoom
DESCRIPTION:<p>&nbsp;</p><p style="text-align: center;"><strong>David Nelson&nbsp; – Ha
 rvard University </strong></p><p style="text-align: center;"><strong>&nbsp;
 </strong></p><p style="text-align: center;"><strong>&nbsp;</strong></p><p s
 tyle="text-align: center;"><strong>Wednesday,&nbsp;October 1st,&nbsp;2025</
 strong></p><p style="text-align: center;"><strong>Zoom opens: 10:30AM DST</
 strong></p><p style="text-align: center;"><strong>Seminar begins: 10:45AM D
 ST</strong></p><p style="text-align: center;"><strong>&nbsp;</strong></p><p
  style="text-align: center;"><strong>Turbulent Mixing and Antagonistic Micr
 oorganisms</strong></p><p>Unlike coffee and cream that homogenize when stir
 red, growing micro-organisms (e.g., bacteria and baker’s yeast) can activel
 y kill each other and avoid mixing.&nbsp; &nbsp; How do such antagonistic i
 nteractions impact the growth and survival of competing strains, while bein
 g spatially advected by turbulent flows?&nbsp; &nbsp; By using analytic arg
 uments and numerical simulations of a continuum model, we describe the dyna
 mics of two antagonistic strains that are dispersed by both compressible an
 d incompressible turbulent flows in two spatial dimensions.&nbsp; &nbsp;A k
 ey parameter is the ratio of the fluid transport time to that of biological
  reproduction, which determines the winning organism that ultimately takes 
 over the whole population from an initial heterogeneous state, a process kn
 own as fixation.&nbsp; &nbsp; By quantifying the probability and mean time 
 for fixation, we discuss how turbulence raises the threshold for biological
  nucleation and antagonism suppresses flow-induced mixing by depleting the 
 population at interfaces.&nbsp; We highlight the unusual biological consequ
 ences of the interplay of turbulent&nbsp;fluid flows with antagonistic popu
 lation dynamics, with potential implications for marine microbial ecology a
 nd origins of biological chirality.</p><p>&nbsp;</p>
CONTACT:David Nelson
DTSTAMP:20260930T121339
DTSTART;TZID=America/New_York:20251001T104500
DTEND;TZID=America/New_York:20251001T120000
SEQUENCE:0
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