Biopolymer dynamics driven by helical flagella
journal contributionposted on 2018-12-10, 11:21 authored by Andrew K. Balin, Andreas Zottl, Julia M. Yeomans, Tyler Shendruk
Microbial flagellates typically inhabit complex suspensions of polymeric material which can impact the swimming speed of motile microbes, filter feeding of sessile cells, and the generation of biofilms. There is currently a need to better understand how the fundamental dynamics of polymers near active cells or flagella impacts these various phenomena, in particular, the hydrodynamic and steric influence of a rotating helical filament on suspended polymers. Our Stokesian dynamics simulations show that as a stationary rotating helix pumps fluid along its long axis, polymers migrate radially inward while being elongated. We observe that the actuation of the helix tends to increase the probability of finding polymeric material within its pervaded volume. This accumulation of polymers within the vicinity of the helix is stronger for longer polymers. We further analyze the stochastic work performed by the helix on the polymers and show that this quantity is positive on average and increases with polymer contour length.
This work was supported through funding from the ERC Advanced Grant No. 291234 MiCE and we acknowledge EMBO funding to T.N.S. (ALTF181-2013). A.Z. acknowledges funding by Marie Skłodowska Curie Intra-European Fellowship (G.A. No. 653284) within Horizon 2020
- Mathematical Sciences