Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modelling of spatio-temporal patterns in bacterial colonies   A diffusion-reaction model for the growth of bacterial colonies is presented.
The often observed cooperative behavior developed by bacteria which increases
their motility in adverse growth conditions is here introduced as a nonlinear
diffusion term. The presence of this mechanism depends on a response which can
present hysteresis. By changing only the concentrations of agar and initial
nutrient, numerical integration of the proposed model reproduces the different
patterns shown by {\it Bacillus subtilis} OG-01.

7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an