Motility of small nematodes in disordered wet granular media

Details Motility of small nematodes in disordered wet granular media Motility of small nematodes in disordered wet granular media

2010-06-04

arxiv.org/abs/1006.0990v3

Physics

Biological Physics

Scientific paper

10.1209/0295-5075/92/44002

The motility of the worm nematode \textit{Caenorhabditis elegans} is investigated in shallow, wet granular media as a function of particle size dispersity and area density ($\phi$). Surprisingly, we find that the nematode's propulsion speed is enhanced by the presence of particles in a fluid and is nearly independent of area density. The undulation speed, often used to differentiate locomotion gaits, is significantly affected by the bulk material properties of wet mono- and polydisperse granular media for $\phi \geq 0.55$. This difference is characterized by a change in the nematode's waveform from swimming to crawling in dense polydisperse media \textit{only}. This change highlights the organism's adaptability to subtle differences in local structure and response between monodisperse and polydisperse media.

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