Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-buckling of filamentous cyanobacteria reveals gliding forces   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 coefficients associated with gliding from the
observed critical filament length for buckling. Remarkably, we find 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.

13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
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The categories of this paper are: eess
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
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The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph