Fig. 4From: Biodegradation of different formulations of polyhydroxybutyrate films in soilSEM micrographs for PHB and PHB–TiO2 composite films. a1 PHB before degradation, b1 PHB–TiO2 before degradation, a2 PHB after degradation, b2 PHB–TiO2 after degradation, a3 PHB after degradation, b3 PHB–TiO2 after degradationBack to article page