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arXiv 2602.05958cond-mat.softcond-mat.stat-mech
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生长细菌群体的几何学与动力学形态

Geometry and dynamical morphology of growing bacterial colonies

University of Vermont(佛蒙特大学);Brandeis University(布兰迪斯大学)

Benjamin Evert Himberg, Sanghita Sengupta

AI总结:

本研究通过时间分辨几何分析揭示了细菌群体生长中几何形态的动态变化,发现非平衡生长在特定条件下可表现出单一尺度的标度行为,同时在持续生长过程中出现局部标度破坏,反映内在动力学重构而非生长停滞。

摘要:

我们利用一种以几何学优先、时间分辨的分析方法,研究非平衡细菌群体生长。通过时间延展显微镜数据,我们追踪了面积、周长和对边界敏感的形状描述符的耦合演变过程,贯穿整个生长历史。我们发现非平衡生长可以表现出延长的紧凑面积-周长标度区间,其指数α≈2,与由单一有效几何长度尺度控制的生长一致,同时在持续生长过程中会出现时间局部化的标度破坏。这些破坏与边界重新组织的短暂过程相吻合,而体积面积增长仍保持持续。我们的结果表明,在同一几何生长制度下,可以出现视觉上不同的形态,且偏离单一尺度行为反映的是内在的动力学重构,而非生长停滞。更广泛地说,这项工作确立了时间分辨几何学作为识别非平衡生长偏离单一尺度几何约束的粗粒化框架。

英文摘要:

We study non-equilibrium bacterial colony growth using a geometry-first, time-resolved analysis of morphology. From time-lapse microscopy data, we track the coupled evolution of area, perimeter, and boundary-sensitive shape descriptors along the full growth history. We find that non-equilibrium growth can exhibit extended intervals of compact area--perimeter scaling with exponent $α\approx 2$, consistent with growth governed by a single effective geometric length scale, as well as time-localized breakdowns of this scaling during ongoing growth. These breakdowns coincide with transient boundary reorganization while bulk area growth remains sustained. Our results demonstrate that visually distinct morphologies can arise within the same geometric growth regime, and that departures from single-scale behavior reflect intrinsic dynamical restructuring rather than growth arrest. More broadly, this work establishes time-resolved geometry as a coarse-grained framework for identifying when non-equilibrium growth departs from single-scale geometric constraints in living systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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