GFS | Prof. Jay Tang | Dynamic pattern evolution in growing bacterial colonies

Описание: GFS | Prof. Jay Tang | Dynamic pattern evolution in growing bacterial colonies

Speaker: Professor Jay Tang (Brown University)
Date: 5th Oct 2017 - 15:00 to 16:30
Venue: INI Seminar Room 2
Title: Dynamic pattern evolution in growing bacterial colonies
Event: (GFS) Growth form and self-organisation
Abstract: A microliter droplet of bacteria can grow and spread
into a centimeter-sized colony on an agar gel surface within several hours,
forming a variety of patterns. An expanding bacterial colony is often referred
to as a swarm, indicating collective motion of the constituent bacteria that
are individually motile. A bacterial swarm is an active fluid with 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 their surrounding
fluid flow leads to rich pattern dynamics involving many coupled physical
parameters. We study the swarming dynamics and pattern evolution following
either conventional dot inoculation, a line inoculation, or an annular
inoculation of Psuedomonas aeruginosa on the gel surface. With slight
changes in agar percentage, ambient humidity, temperature, or level of
surfactants, the dot inoculation is known to produce a rich variety of patterns.
The ring inoculation leads to observation of edge-directed accumulation,
wavelike structures due to hyper-elastic buckling, droplet formation due to the
Rayleigh–Plateau instability, and collective migration of droplets and their
coalescence in subsequent growth. Our experiments offer strong evidence that
physical effects largely account for most patterns that develop in expanding
bacterial colonies.

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