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SUMMARY:Structure and dynamics of dense bacterial populations - Kazumasa T
 akeuchi (University of Tokyo)
DTSTART:20230706T110000Z
DTEND:20230706T113000Z
UID:TALK201181@talks.cam.ac.uk
DESCRIPTION:Bacteria often live in the form of dense aggregates such as bi
 ofilms. It is therefore important to characterize dense states of bacteria
 \, but is also challenging because in many cases it is experimentally diff
 icult to realize a uniform growth condition for dense populations. Here we
  overcome this by a membrane-based device that we recently developed [1] a
 nd report the emergence of glassy states in two-dimensionally confined mot
 ile Escherichia coli [2]. We find that the system undergoes two separate g
 lass transitions as packing fraction is increased\, first the glass transi
 tion for the orientation degrees of freedom and second that for the transl
 ational ones. We characterize this bacterial glass transition and discuss 
 similarities and dissimilarities compared with usual glass formers. If tim
 e allows\, I also discuss the case of nonmotile E. coli under soft two-dim
 ensional confinement\, where topological defects turned out to influence s
 tructure and dynamics of bacterial populations [3]. [1] T. Shimaya et al.\
 , Commun. Phys. 4\, 238 (2021) https://doi.org/10.1038/s42005-021-00739-5 
 [2] H. Lama et al.\, arXiv:2205.10436 https://doi.org/10.48550/arXiv.2205.
 10436 [3] T. Shimaya and K. A. Takeuchi\, PNAS Nexus 1\, pgac269 (2022) ht
 tp://dx.doi.org/10.1093/pnasnexus/pgac269
LOCATION:Seminar Room 1\, Newton Institute
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