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Changes in the surface and functional group of PBS films after degradation. (a) The surface of PBS was observed using SEM after 3, 5, 7, and 10 days of cultivation. (b) Cracks and rough surfaces formed after degradation were also observed using FE-SEM with high magnification. (c) Changes in functional groups were confirmed using FI-IR analysis. After degradation by Terribacillus sp. JY49, peak intensities changed with time.
