Self-Affinity for the Growing Interface of Bacterial Colonies

概要

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We have investigated experinuentally the self-affinity of bacterial colonies. We exarnined rotrgh-mess exponent a for one-dimensional growing interfaces of colonies which belong to regions B andD in the morphological phase diagrarn of bacterial species Bacillus subtilis. Although macro-scopically cornpact colony patterns are obtained in both B and D regions, rnicroscopic growthmechanisms of their colony interfaces are qtrite different from each other. In the region B wherethe colony interface consists of many chains of bacterial cells that lie alunost side by side andadvances with clear long-range lateral correlations, we obt?tined a ':: 0.78 i 0.02. In the re-gion D, however, where the interface is trade of individtral cells and advances rather locallythrough random pushes due to active tnovernent of individtral cells inside the colony, the valueof a Th 0.50 i 0.01 was obtained. The difference of values of the exponent Q was thtrs found tobe clearly attribtrted to that of microscopic growth naechanisrns of colony interfaces.
社団法人日本物理学会の論文
1997-01-15