Bacterial Fractal Growth in the Concentration Field of Nutrient

概要

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A Bacillus subtilis strain is found to grow through the diffusion-limited aggregation(DLA) process on agar plates. The organism is spotted on the agar plate containing alow concentration of peptone as a single nutrient and incubated at 35'C. The colonypattern grown on the plate surface is self-similar with the fractal dimension of1.73:0.02. Bacterial DLA branches are shown to grow in a concentration field ofnutrient from the fact that they grow predominantly in the direction of highernutrient concentration. The colonial morphology varies with the nutrient and agarconcentrations of an agar plate, including DLA, a round type, dense branching mor-phology (DBM), and a spreading without openings. Two neighboring coloniesrepulse each other in DLA and DBM types only. On an agar plate containing glycerolthe colony becomes remarkably round, quite different from the DLA morphology.[fractal, diffusion-limited aggregation, bacterial growth, colony, agar plate, ]l dense branching morphologyl
社団法人日本物理学会の論文
1991-01-15