Fig. 2

Thin section micrographs of mineral grow composites produced in presence of Bacillus subtilis at different condition. a BCC-GLY, b BCC-GLC, c BCC-LAC, and d BCC-ACE. Images were acquired with polarized and analyzed light. They show size, shape, and optical properties of biogenetic crystals from diverse media. Arrows symbol show a key optical property, of light extinction (see result and discussion text). Scale bar: 100 μm