Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Biophysics underlying the swarm to biofilm transition   Bacteria organize in a variety of collective states, from swarming, which has
been attributed to rapid surface exploration, to biofilms, which are highly
dense immobile communities attributed to stress resistance. It has been
suggested that biofilm and swarming are oppositely controlled, making this
transition particularly interesting for understanding the ability of bacterial
colonies to adapt to challenging environments. Here, the swarm to biofilm
transition is studied experimentally by analyzing the bacterial dynamics both
on the individual and collective scales. We show that both biological and
physical processes facilitate the transition - a few individual cells that
initiate the biofilm program cause nucleation of large, scale-free stationary
aggregates of trapped swarm cells. Around aggregates, cells continue swarming
almost unobstructed, while inside, trapped cells slowly transform to biofilm.
While our experimental findings rule out previously suggested purely physical
effects as a trigger for biofilm formation, they show how physical processes,
such as clustering and jamming, accelerate biofilm formation.

25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org