Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Twitching Motility of Bacteria with Type IV Pili: Fractal Walks, First
  passage time and their Consequences on Microcolonies   A human pathogen, \textit{Neisseria gonorrhoeae} (NG), moves on surfaces by
attaching and retracting polymeric structures called Type IV pili. The
\textit{tug-of-war} between the pili results in a two-dimensional stochastic
motion called \textit{twitching motility}. In this paper, with the help of real
time NG trajectories, we develop coarse-grained models for their description.
The \textit{fractal properties} of these trajectories are determined and their
influence on \textit{first passage time} and formation of bacterial
microcolonies is studied. Our main observations are as follows: (i) NG performs
a fast ballistic walk on small time scales and a slow diffusive walk over long
time scales with a long crossover region; (ii) There exists a characteristic
persistent length $l_p^*$ which yields the fastest growth of bacterial
aggregates or biofilms. Our simulations reveal that $l_{p}^{*} \sim L^{0.6}$,
where $L\times L$ is the surface on which the bacteria move; (iii) The
morphologies have distinct fractal characteristics as a consequence of the
ballistic and diffusive motion of the constituting bacteria.

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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
1
The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
2
The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph