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DAPI staining (left panels) and Cy3-labeled 16S rRNA-targeted FISH (right panels) of samples taken from a mineral-sulfide-oxidizing bioreactor after 53 days of continuous culture gassed with air (reactor 2). FISH probes and the targeted organisms were Eub338 (eubacteria) (A), Atc:455 (Acidithiobacillus caldus) (B), Am:654 (Acidimicrobium species) (C), and S:628 (Sulfobacillus species) (D).
