Fig. 4
From: Bacillus subtilis biofilm development in the presence of soil clay minerals and iron oxides
Contact of minerals and bacteria cells, and the resulting gene experssion changes. AFM height (a) and peak force images (b) of B. subtilis biofilm formed on mineral surfaces after 24 and 48 h (20 × 20 μm2). Top panel: B. subtilis on montmorillonite-coated surface (Mon); Middle panel: B. subtilis on kaolinite-coated surface (Kao); Bottom panel: B. subtilis on goethite-coated surface (Goe). c–f: Quantitative expression analyses of the sinR (c, e for 24, 48 h, respectively) and abrB (d, f for 24, 48 h, respectively) genes. Both of the genes are critical regulators that involved in the regulation of B. subtilis biofilm formation and cell motility
