Abstract
The dynamics of the growth of three different strains of bacteria, ATCC 25589, Bacillus subtilis and Escherichia coli, was studied under different conditions of low as well as rich nutrient concentrations. We find that within the statistical fluctuations in the experimental data, the mean radius of the bacterial colonies grow with a power of time and the exponent characterizing this power law growth has an anomalous value. We present and discuss a simple phenomenological approach for explaining the existence of anomalous power-law exponents in bacterial growth. This approach may be useful in determining the key mechanisms which control the growth and morphology of bacterial colonies.
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