Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Films of Bacteria at Interfaces (FBI): Remodeling of Fluid Interfaces by
  Pseudomonas aeruginosa   Bacteria at fluid interfaces endure physical and chemical stresses unique to
these highly asymmetric environments. The responses of Pseudomonas aeruginosa
PAO1 and PA14 to a hexadecane-water interface are compared. PAO1 cells form
elastic films of bacteria, excreted polysaccharides and proteins, whereas PA14
cells move actively without forming an elastic film. Studies of PAO1 mutants
show that, unlike solid-supported biofilms, elastic interfacial film formation
occurs in the absence of flagella, pili, or certain polysaccharides. Highly
induced genes identified in transcriptional profiling include those for
putative enzymes and a carbohydrate metabolism enzyme, alkB2; this latter gene
is not upregulated in PA14 cells. Notably, PAO1 mutants lacking the alkB2 gene
fail to form an elastic layer. Rather, they form an active film like that
formed by PA14. These findings demonstrate that genetic expression is altered
by interfacial confinement, and suggest that the ability to metabolize alkanes
may play a role in elastic film formation at oil-water interfaces.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th