University of Cambridge > Talks.cam > DAMTP BioLunch > Bacterial magneto-convection

Bacterial magneto-convection

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Anne Herrmann.

Magnetotactic bacteria are prokaryotic micro-swimmers characterised by their ability to synthetize chains of nano-magnets in their cytoplasm, magnetosomes. They passively align to magnetic lines through magnetic torque, which enables them to be easily controlled remotely. We use microfluidics experiments to explore the self organisation and unsteady dynamics of magnetotactic bacteria AMB1 . A uniform distribution of bacteria under confinement is rendered unstable by the application of a magnetic field 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 convection cells. Using a theoretical model based on hydrodynamic singularities, we reproduce reproduce the flow field in the bacteria suspension and capture quantitatively the instability as well as the observed long-time growth and merging of the plumes.

This talk is part of the DAMTP BioLunch series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2019 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity