Mitsugu Matsushita

TL;DR: In this article, the authors obtained a fractal dimension of the colony patterns of Bacillus subtilis of D=1.73±0.02, very close to that of the two-dimensional DLA model, and confirmed the existence of the screening effect of protruding main branches against inner ones in a colony, the repulsion between two neighboring colonies and the tendency to grow toward nutrient.

TL;DR: In this article, a Bacillus subtilis strain was inoculated on the plate surface and incubated at 35°C, and the colony patterns were analyzed and found to be self-similar with a fractal dimension of 1.716±0.008, in excellent agreement with the expected value of the DLA model.

TL;DR: In this article, the authors developed a diffusion-reaction model, in which density dependent cell movements are incorporated by the level of nutrient concentration available for the cell, which predicts the growth velocity of a colony as a function of the nutrient concentration.

TL;DR: The data showed no connection between nutrient (glucose) depletion and the onset of different phases in swarm colony morphogenesis, and several observations point to the operation of density-dependent thresholds in controlling the transitions between distinct phases.

TL;DR: This article proposed reaction diffusion models to describe the morphological diversity of Bacillus subtilis colony patterns except for Eden-like ones, and showed that the diversity of colony patterns observed in experiments is caused by different effects or governed by the same underlying principles.