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(A) Microscopy image of Chromatium okenii cells (100X magnification) with intracellular sulfur globules. (B) Flow cytometry mean sideward scatter (SSC) of C. okenii and small-celled PSB and corresponding sulfide concentrations in the upper and lower part of the bacterial layer on 16 July and 17 September 2020. Error bars represent standard deviation (n = 3).
