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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Structure and dynamics of dense bacterial populati
 ons - Kazumasa Takeuchi (University of Tokyo)
DTSTART;TZID=Europe/London:20230706T120000
DTEND;TZID=Europe/London:20230706T123000
UID:TALK201181AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/201181
DESCRIPTION:Bacteria often live in the form of dense aggregate
 s such as biofilms. It is therefore important to c
 haracterize dense states of bacteria\, but is also
  challenging because in many cases it is experimen
 tally difficult to realize a uniform growth condit
 ion for dense populations. Here we overcome this b
 y a membrane-based device that we recently develop
 ed [1] and report the emergence of glassy states i
 n two-dimensionally confined motile Escherichia co
 li [2]. We find that the system undergoes two sepa
 rate glass transitions as packing fraction is incr
 eased\, first the glass transition for the orienta
 tion degrees of freedom and second that for the tr
 anslational ones. We characterize this bacterial g
 lass transition and discuss similarities and dissi
 milarities compared with usual glass formers. If t
 ime allows\, I also discuss the case of nonmotile 
 E. coli under soft two-dimensional confinement\, w
 here topological defects turned out to influence s
 tructure and dynamics of bacterial populations [3]
 . [1] T. Shimaya et al.\, Commun. Phys. 4\, 238 (2
 021) https://doi.org/10.1038/s42005-021-00739-5 [2
 ] H. Lama et al.\, arXiv:2205.10436 https://doi.or
 g/10.48550/arXiv.2205.10436 [3] T. Shimaya and K. 
 A. Takeuchi\, PNAS Nexus 1\, pgac269 (2022) http:/
 /dx.doi.org/10.1093/pnasnexus/pgac269
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:
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