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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: \nDavid Nelson  – Harvard University \n \n \nWednesday, October 1st, 2025\
 nZoom opens: 10:30AM DST\nSeminar begins: 10:45AM DST\n \nTurbulent Mixing 
 and Antagonistic Microorganisms\nUnlike coffee and cream that homogenize wh
 en stirred, growing micro-organisms (e.g., bacteria and baker’s yeast) can 
 actively kill each other and avoid mixing.    How do such antagonistic inte
 ractions impact the growth and survival of competing strains, while being s
 patially advected by turbulent flows?    By using analytic arguments and nu
 merical simulations of a continuum model, we describe the dynamics of two a
 ntagonistic strains that are dispersed by both compressible and incompressi
 ble turbulent flows in two spatial dimensions.   A key parameter is the rat
 io of the fluid transport time to that of biological reproduction, which de
 termines the winning organism that ultimately takes over the whole populati
 on from an initial heterogeneous state, a process known as fixation.    By 
 quantifying the probability and mean time for fixation, we discuss how turb
 ulence raises the threshold for biological nucleation and antagonism suppre
 sses flow-induced mixing by depleting the population at interfaces.  We hig
 hlight the unusual biological consequences of the interplay of turbulent fl
 uid flows with antagonistic population dynamics, with potential implication
 s for marine microbial ecology and origins of biological chirality.\n \n
X-ALT-DESC;FMTTYPE=text/html:<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:20260922T072130
DTSTART;TZID=America/New_York:20251001T104500
DTEND;TZID=America/New_York:20251001T120000
SEQUENCE:0
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