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Lubricating bacteria model for the growth of bacterial colonies exposed to ultraviolet radiation
PHYSICAL REVIEW E 72, 051913 (2005),-0001,():
In this paper, we study the morphological transition of bacterial colonies exposed to ultraviolet radiation by modifying the bacteria model proposed by Delprato et al. Our model considers four factors: the lubricant fluid generated by bacterial colonies, a chemotaxis initiated by the ultraviolet radiation, the intensity of the ultraviolet radiation, and the bacteria's two-stage destruction rate with given radiation intensities. Using this modified model, we simulate the ringlike pattern formation of the bacterial colony exposed to uniform ultraviolet radiation. The following is shown. 1 Without the UV radiation the colony forms a disklike pattern and reaches a constant front velocity. 2 After the radiation is switched on, the bacterial population migrates to the edge of the colony and forms a ringlike pattern. As the intensity of the UV radiation is increased the ring forms faster and the outer velocity of the colony decreases. 3 For higher radiation intensities the total population decreases, while for lower intensities the total population increases initially at a small rate and then decreases. 4 After the UV radiation is switched off, the bacterial population grows both outward as well as into the inner region, and the colony's outer front velocity recovers to a constant value. All these results agree well with the experimental observations Phys. Rev. Lett. 87, 158102 (2001). Along with the chemotaxis, we find that lubricant fluid and the two-stage destruction rate are critical to the dynamics of the growth of the bacterial colony when exposed to UV radiation, and these were not previously considered.
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