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Scanning electron microscopy (SEM) shows PLA fracturing around B. pumilus B12 cells. (A–C) 5,000× magnification of 10 mg/mL of PLA film for 48 h with: media only (A), B. pumilus B12 (B), and Proteinase K (C). (D–F) 30,000× magnification of 10 mg/mL PLA films with: media only (D), B. pumilus B12 (E), and Proteinase K (F).
