Giant sulfur bacteria
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| Upper picture: Two Beggiatoa
spp. from Guaymas under UV light. The larger species (ca. 100 µm Ø) is fluorescing blue, the smaller species (35 um Ø) yellow-orange. UV epifluorescence microphotograph.
Lower picture: Sulfur-rich Thioploca ingrica filaments collected from decaying reed in Randersfjord, Denmark. Filament diameter is 3.5 - 4 µm.
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