Universality in Bacterial Colonies
Universality in Bacterial Colonies
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DOI：
10.1007/s10955-011-0179-x
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发表时间：
2011-07-01
影响因子：
1.6
通讯作者：
Levin, Simon A.
中科院分区：
文献类型：
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作者：
Bonachela, Juan A.;Nadell, Carey D.;Levin, Simon A.
在过去的二十年里，由细菌菌落生长产生的新兴空间模式一直是物理学研究的焦点。实验和理论研究都使这种菌落可以表现出不同的结构的清晰定性图像成为可能，这取决于它们生长的培养基。然而，对这些模式的定量描述相对较少。在本文中，我们使用了一个详细的模拟框架来测量与硬琼脂基质上的细菌菌落的前进前沿相关的标度指数，旨在辨别系统所属的普适性类。我们表明，殖民地所表现出的普遍行为可以比以前报道的更丰富，我们提出了高达四个不同的子阶段的可能性，在中高营养浓度制度。我们假设，这些子阶段之一的特征淬火的障碍是一个新兴的属性的生长和细菌的分裂竞争有限的空间和营养物质。
The emergent spatial patterns generated by growing bacterial colonies have been the focus of intense study in physics during the last twenty years. Both experimental and theoretical investigations have made possible a clear qualitative picture of the different structures that such colonies can exhibit, depending on the medium on which they are growing. However, there are relatively few quantitative descriptions of these patterns. In this paper, we use a mechanistically detailed simulation framework to measure the scaling exponents associated with the advancing fronts of bacterial colonies on hard agar substrata, aiming to discern the universality class to which the system belongs. We show that the universal behavior exhibited by the colonies can be much richer than previously reported, and we propose the possibility of up to four different sub-phases within the medium-to-high nutrient concentration regime. We hypothesize that the quenched disorder that characterizes one of these sub-phases is an emergent property of the growth and division of bacteria competing for limited space and nutrients.