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Bioengineers and physicists at the University of California San Diego, in a paper published in the current issue of the Proceedings of the National Academy of Sciences, have begun to address these fundamental questions.
The UC San Diego scientists focused their research on dense colonies of the rod-shaped bacteria Escherichia coli. By analysing the spatial organisation of the bacteria in a microfluidic chemostat - a kind of mini-circuit board for liquids rather than electrons - they found that growth and expansion of a dense colony of cells leads to a dynamic change from relative disorder to a remarkable re-orientation and alignment of the rod-like cells.
That finding, described in their paper 'Biomechanical Ordering of Dense Cell Populations,' allowed them to develop a model of collective cell dynamics, and to use this model to 'elucidate the mechanism of cell ordering, and quantify the relationship between the dynamics of cell proliferation and the spatial structure of the population.'
One of the authors, Lev S. Tsimring, at UC San Diego's Institute of Nonlinear Science, explained the bioengineers' use of bacteria to study the biomechanical ordering of cells.
'When environmental conditions are harsh, bacteria like to stick together

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