Interface growth and pattern formation in bacterial colonies

被引:107
作者
Matsushita, M [1 ]
Wakita, J
Itoh, H
Rafols, I
Matsuyama, T
Sakaguchi, H
Mimura, M
机构
[1] Chuo Univ, Dept Phys, Bunkyo Ku, Tokyo 112, Japan
[2] Niigata Univ, Sch Med, Dept Bacteriol, Niigata 951, Japan
[3] Univ Tokushima, Fac Engn, Dept Math, Tokushima 770, Japan
[4] Univ Tokyo, Grad Sch Math Sci, Tokyo 153, Japan
来源
PHYSICA A | 1998年 / 249卷 / 1-4期
关键词
pattern formation; bacterial colony; interface growth; self-affinity;
D O I
10.1016/S0378-4371(97)00511-6
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Bacterial species Bacillus subtilis is known to exhibit various colony patterns, depending on the substrate softness and nutrient concentration. We have examined the self-affinity and roughness exponent a for growing interfaces of colonies which belong to regions B (Eden-like) and D (disk-like) in the morphological phase diagram of this species. We have obtained alpha similar or equal to 0.78 and 0.50 in the regions B and D, respectively, and found that the difference of alpha values can be attributed to that of microscopic growth mechanisms of colony interfaces. We have also proposed a unified model which produces characteristic colony patterns observed in our experiments. It is a diffusion-reaction-type model for the population density of bacterial cells and the concentration of nutrient. The essential assumption is that there exist two types of bacterial cells; active and inactive. Our model is found to be able to globally reproduce all the colony patterns in the phase diagram. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:517 / 524
页数:8
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