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SUMMARY:Bacterial magneto-convection - Albane Thery (University of Cambrid
 ge)
DTSTART:20190516T120000Z
DTEND:20190516T130000Z
UID:TALK125116@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:Magnetotactic bacteria are prokaryotic micro-swimmers characte
 rised by their ability to synthetize chains of nano-magnets in their cytop
 lasm\, magnetosomes. They passively align to magnetic lines through magnet
 ic torque\, which enables them to be easily controlled remotely. We use mi
 crofluidics experiments to explore the self organisation and unsteady dyna
 mics of magnetotactic bacteria AMB1. A uniform distribution of bacteria un
 der confinement is rendered unstable by the application of a magnetic fiel
 d perpendicular to channel walls. A state of bacterial magneto-convection 
 results wherein bacterial plumes emerge spontaneously perpendicular to the
  wall and develop into stable and reproducible self-sustained flow convect
 ion cells. Using a theoretical model based on hydrodynamic singularities\,
  we reproduce reproduce the flow field in the bacteria suspension and capt
 ure quantitatively the instability as well as the observed long-time growt
 h and merging of the plumes.\n
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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