Figure F121. Photomicrographs and schematic images of epifluorescence observations of anaerobic cultures after 4 weeks of incubation. A-1, A-2. DAPI-stained bacteria (blue) in suspensions of clay minerals (orange) from sterilized seawater culture at 25°C. B-1, B-2. DAPI-stained bacterial colonies (blue) and clay mineral assemblage (orange) from sterile synthetic seawater at 25°C. C. Rod-shaped bacteria found in sterilized synthetic seawater.