Fig. 3From: Microbial diversity in various types of paper mill sludge: identification of enzyme activities with potential industrial applicationsDetection of bacteria producing PHA after Sudan Black B (1a, 1b) and Nile blue A (2a, 2b) staining. 1a PHA positive bacteria revealed with Sudan Black B staining. 1b PHA negative bacteria revealed with Sudan Black B staining. 2a PHA negative with Nile blue staining. 2b PHA positive with Nile blue stainingBack to article page