Medvinsky A B, Tsyganov M A, Kutyshenko V P, Kresteva I B, Ivanitsky G R
Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow.
FEMS Microbiol Lett. 1993 Sep 15;112(3):287-90. doi: 10.1111/j.1574-6968.1993.tb06464.x.
Many motile chemotactic bacteria (for instance, Escherichia coli) inoculated at some point in a semisolid nutrient medium can form circular expanding population waves. The formation of these motile structures is due to chemotaxis. The circular waves originate from an expanding bacterial lawn (a parent population). The regular shape of these waves results from the isotropic distribution of freely diffusible nutrient molecules which are also attractants. In this paper we show that the regular shape of the bacterial population waves can be spontaneously disturbed. As this takes place arc-shaped population waves ('bursts') are formed. It was found that initially the mean length of the cells forming the bursts was greater than that of the parent cell population. But then it decreased resulting in a value characteristic of the parent population.
许多游动趋化细菌（例如大肠杆菌）接种在半固体营养培养基的某个点上时，会形成圆形扩展的群体波。这些游动结构的形成是由于趋化作用。圆形波起源于不断扩展的细菌菌苔（亲本群体）。这些波的规则形状源于自由扩散的营养分子（也是引诱剂）的各向同性分布。在本文中，我们表明细菌群体波的规则形状会自发受到干扰。发生这种情况时，会形成弧形群体波（“爆发”）。研究发现，最初形成爆发的细胞的平均长度大于亲本细胞群体的平均长度。但随后它会下降，最终达到亲本群体的特征值。
