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. 2002 Apr;68(4):1938–1946. doi: 10.1128/AEM.68.4.1938-1946.2002

FIG. 4.

FIG. 4.

Scanning electron micrograph survey of bioreactor pumice granules and biofilm development. (A) After 2 days of operation, the cavernous surface of a pumice granule was almost blank and no biofilms were visible. (B) After 224 days of operation, a dense biofilm covered the surface and filled the caverns. (C) The 224-day-old biofilm consisted of rod-shaped Pseudomonas cells embedded in a thick layer of EPSs.