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SEM images of BC pellicles obtained after 10 days of fermentation in (A) Hestrin–Schramm (HS) medium (2% glucose, 0.5% yeast extract, 0.5% peptone, 0.27% Na2HPO4, and 1.5% citric acid) and (B) alternative medium formulated with 1.5% glucose, 2.5% CSL, 0.27% Na2HPO4, and 1.5% citric acid. Magnification: 8,000 (A,B) and 20,000 times (C,D).
