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Self-buckling of filamentous cyanobacteria reveals gliding forces

Title data

Kurjahn, Maximilian ; Deka, Antaran ; Girot, Antoine ; Abbaspour, Leila ; Klumpp, Stefan ; Lorenz, Maike ; Bäumchen, Oliver ; Karpitschka, Stefan:
Self-buckling of filamentous cyanobacteria reveals gliding forces.
Ithaca, NY, USA , 2022 . - 9 p.

Abstract in another language

Filamentous cyanobacteria are one of the oldest and today still most abundant lifeforms on earth,with manifold implications in ecology and economics. These phototrophic organisms form long and flexible filaments that exhibit gliding motility in contact with solid surfaces. The underlying force generating mechanism is not yet understood. We measure their bending rigidity with micropipette force sensors, and investigate how filaments buckle after gliding onto an obstacle. Comparing Kirchhoff theory to the experiments, we derive the active forces and the friction coeffcients associated with gliding from the observed critical filament length for buckling. Remarkably, we found that these two quantities are strongly correlated to each other, while dependencies on other observables are largely absent. The observed critical lengths align with the peaks of natural length distributions:
small changes in active forces or length distributions may determine whether the majority of a colony undergoes buckling instabilities or not.

Further data

Item Type: Preprint, postprint
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V > Chair Experimental Physics V - Univ.-Prof. Dr. Oliver Bäumchen
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 530 Physics
Date Deposited: 23 Mar 2022 10:55
Last Modified: 23 Mar 2022 10:55
URI: https://eref.uni-bayreuth.de/id/eprint/68841