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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

Active sorting to boundaries in active nematic-passive isotropic fluid mixtures.

Soft Matter (2025)

Authors:

Saraswat Bhattacharyya, Julia M Yeomans

Abstract:

We use a two-fluid model to study a confined mixture of an active nematic fluid and a passive isotropic fluid. We find that an extensile active fluid preferentially accumulates at a boundary if the anchoring is planar, whereas its boundary concentration decreases for homeotropic anchoring. These tendencies are reversed if the active fluid is contractile. We argue that the sorting results from gradients in the nematic order, and show that the behaviour can be driven by either imposed boundary anchoring or spontaneous anchoring induced by active flows. Our results can be tested by experiments on microtubule-kinesin motor networks, and may be relevant to sorting to the boundary in cell colonies or cancer spheroids.
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Active nematics: a new approach to mechanobiology?

Liquid Crystals Taylor & Francis ahead-of-print:ahead-of-print (2025) 1-9

Authors:

Julia M Yeomans, Saraswat Bhattacharyya, Mehrana R Nejad
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Coarse-graining dense, deformable active particles

(2025)

Authors:

Mehrana R Nejad, Julia M Yeomans
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Cellular dynamics emerging from turbulent flows steered by active filaments

(2025)

Authors:

Mehrana R Nejad, Julia M Yeomans, Sumesh P Thampi
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Vertex model with internal dissipation enables sustained flows

Nature Communications Nature Research 16:1 (2025) 530

Authors:

Jan Rozman, KVS Chaithanya, Julia M Yeomans, Rastko Sknepnek

Abstract:

Complex tissue flows in epithelia are driven by intra- and inter-cellular processes that generate, maintain, and coordinate mechanical forces. There has been growing evidence that cell shape anisotropy, manifested as nematic order, plays an important role in this process. Here we extend an active nematic vertex model by replacing substrate friction with internal viscous dissipation, dominant in epithelia not supported by a substrate or the extracellular matrix, which are found in many early-stage embryos. When coupled to cell shape anisotropy, the internal viscous dissipation allows for long-range velocity correlations and thus enables the spontaneous emergence of flows with a large degree of spatiotemporal organisation. We demonstrate sustained flow in epithelial sheets confined to a channel, providing a link between the cell-level vertex model of tissue dynamics and continuum active nematics, whose behaviour in a channel is theoretically understood and experimentally realisable. Our findings also show a simple mechanism that could account for collective cell migration correlated over distances large compared to the cell size, as observed during morphogenesis.
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