Fig. 2From: Novel biological aqua crust enhances in situ metal(loid) bioremediation driven by phototrophic/diazotrophic biofilmSurface morphology and microstructure of the biological aqua crust (BAC). A the freeze-dried EPS and minerals revealed by stereomicroscope; (B) organo-mineral aggregates visualized by stereomicroscope in original conditions; (C) aggregates including filamentous organisms and mineral particles revealed by stereomicroscope; (D) microorganisms and minerals revealed by SEM; (E, F) EPS and mineral particles revealed by TEM in the BAC. The photos of morphology and microstructure were originated from upstream BAC, and the layout was conducted using Adobe Illustrator CC (v23.0) softwareBack to article page