Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D06: Mechanics of Cells and Tissues II
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 129
Sponsoring
Unit:
DBIO
Chair: Ming Guo, MIT
Abstract: D06.00010 : T1 transitions as active hexatic defect annihilations*
5:12 PM–5:24 PM
Presenter:
Dimitrios Krommydas
(Leiden University)
Authors:
Dimitrios Krommydas
(Leiden University)
Livio Nicola Carenza
(Leiden University - Lorentz Institute)
Luca Giomi
(Leiden University)
Collaboration:
I prefer presentation Monday or Tuesday.
monolayers can be accurately and predicatively described by the annihilation
dynamics of an active, hexatic defect quadrupole. In this context, we find that
the change in morphology (exchange of neighbors) of the T1 network, corresponds
to a rotation of the hexatic director, naturally occurring in the defect
annihilation. Furthermore, we discover that the flow field generated during the
annihilation, coincides with that experimentally observed during T1 remodeling
events [1]. Finally, we demonstrate that the explicit dependence of our analytic
expressions in activity, allows for experimental measurements of the magnitude
and, more importantly, the sign of the activity in these systems. Our work constitutes
an essential step towards a deeper understanding of cell intercalation
and other remodeling events in epithelial layers, where small-scale hexatic order
has been recently discovered [2][3].
[1] S. J. Streichan, M. F. Lefebvre, N. Noll, E. F Wieschaus, Boris I Shraiman,
eLife 7:e27454 (2018)
[2] J.-M. Armengol-Collado, L. N.Carenza, and L. Giomi, arXiv:2202.00651
(2022).
[3] J.-M. Armengol-Collado, L. N. Carenza, J. Eckert, D. Krommydas, and L.
Giomi, arXiv:2202.00668 (2022).
*This work is supported by the ERC-CoG grant HexaTissue and by Netherlands Organization for Scientific Research (NWO/OCW). Part of this work was carried out on the Dutch national e-infrastructure with the support of SURF through the Grant 2021.028 for computational time.
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