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Theoretical physicists working at a blackboard collaboration pod in the Beecroft building.
Credit: Jack Hobhouse

Julia Yeomans OBE FRS

Professor of Physics

Research theme

  • Biological physics

Sub department

  • Rudolf Peierls Centre for Theoretical Physics

Research groups

  • Condensed Matter Theory
Julia.Yeomans@physics.ox.ac.uk
Telephone: 01865 (2)76884 (college),01865 (2)73992
Rudolf Peierls Centre for Theoretical Physics, room 70.10
www-thphys.physics.ox.ac.uk/people/JuliaYeomans
  • About
  • Publications

MicroMotility: state of the art, recent accomplishments and perspectives on the mathematical modeling of bio-motility at microscopic scales

Mathematics in Engineering AIMS Press 2:2 (2020) 230-252

Authors:

Daniele Agostinelli, Roberto Cerbino, Juan C Del Alamo, Antonio DeSimone, Stephanie Hohn, Cristian Micheletti, Giovanni Noselli, Eran Sharon, Julia Yeomans

Abstract:

Mathematical modeling and quantitative study of biological motility (in particular, of motility at microscopic scales) is producing new biophysical insight and is offering opportunities for new discoveries at the level of both fundamental science and technology. These range from the explanation of how complex behavior at the level of a single organism emerges from body architecture, to the understanding of collective phenomena in groups of organisms and tissues, and of how these forms of swarm intelligence can be controlled and harnessed in engineering applications, to the elucidation of processes of fundamental biological relevance at the cellular and sub-cellular level. In this paper, some of the most exciting new developments in the fields of locomotion of unicellular organisms, of soft adhesive locomotion across scales, of the study of pore translocation properties of knotted DNA, of the development of synthetic active solid sheets, of the mechanics of the unjamming transition in dense cell collectives, of the mechanics of cell sheet folding in volvocalean algae, and of the self-propulsion of topological defects in active matter are discussed. For each of these topics, we provide a brief state of the art, an example of recent achievements, and some directions for future research.
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Active nematics with anisotropic friction: the decisive role of the flow aligning parameter.

Soft matter (2020)

Authors:

Kristian Thijssen, Julia M Yeomans, Amin Doostmohammadi, Luuk Metselaar

Abstract:

We use continuum simulations to study the impact of anisotropic hydrodynamic friction on the emergent flows of active nematics. We show that, depending on whether the active particles align with or tumble in their collectively self-induced flows, anisotropic friction can result in markedly different patterns of motion. In a flow-aligning regime and at high anisotropic friction, the otherwise chaotic flows are streamlined into flow lanes with alternating directions, reproducing the experimental laning state that has been obtained by interfacing microtubule-motor protein mixtures with smectic liquid crystals. Within a flow-tumbling regime, however, we find that no such laning state is possible. Instead, the synergistic effects of friction anisotropy and flow tumbling can lead to the emergence of bound pairs of topological defects that align at an angle to the easy flow direction and navigate together throughout the domain. In addition to confirming the mechanism behind the laning states observed in experiments, our findings emphasise the role of the flow aligning parameter in the dynamics of active nematics.
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Polar jets of swimming bacteria condensed by a patterned liquid crystal

(2020)

Authors:

Taras Turiv, Runa Koizumi, Kristian Thijssen, Mikhail M Genkin, Hao Yu, Chenhui Peng, Qi-Huo Wei, Julia M Yeomans, Igor S Aranson, Amin Doostmohammadi, Oleg D Lavrentovich
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Active matter in a viscoelastic environment

(2020)

Authors:

Emmanuel Lance Christopher VI M Plan, Julia Yeomans, Amin Doostmohammadi
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Activity induced nematic order in isotropic liquid crystals

(2019)

Authors:

Sreejith Santhosh, Mehrana R Nejad, Amin Doostmohammadi, Julia M Yeomans, Sumesh P Thampi
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