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SUMMARY:Dynamic pattern evolution in growing bacterial colonies - Jay Tang
  (Brown University)
DTSTART:20171005T140000Z
DTEND:20171005T153000Z
UID:TALK84181@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<span>A microliter droplet of bacteria can grow and spread int
 o a centimeter-sized colony on an agar gel surface within several hours\, 
 forming a variety of patterns. An expanding bacterial colony is often refe
 rred to as a swarm\, indicating collective motion of the constituent bacte
 ria that are individually motile. A bacterial swarm is an active fluid wit
 h rapid increase in total particle number and collective motion\, but the 
 swarm expansion is limited by water availability and surface tension. The 
 strong coupling between the activity of individually motile bacteria and t
 heir surrounding fluid flow leads to rich pattern dynamics involving many 
 coupled physical parameters. We study the swarming dynamics and pattern ev
 olution following either conventional dot inoculation\, a line inoculation
 \, or an annular inoculation of <i>Psuedomonas aeruginosa</i> on the gel s
 urface. With slight changes in agar percentage\, ambient humidity\, temper
 ature\, or level of surfactants\, the dot inoculation is known to produce 
 a rich variety of patterns. The ring inoculation leads to observation of e
 dge-directed accumulation\, wavelike structures due to hyper-elastic buckl
 ing\, droplet formation due to the Rayleigh&ndash\;Plateau instability\, a
 nd collective migration of droplets and their coalescence in subsequent gr
 owth. Our experiments offer strong evidence that physical effects largely 
 account for most patterns that develop in expanding bacterial colonies.&nb
 sp\;</span>  <br><br><br><br>
LOCATION:Seminar Room 2\, Newton Institute
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