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South Pacific Ocean, Duration 14 seconds
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Spirochaetes are motile bacteria. They have very fine flagella attached to the cell surface, and the rotating action of these propel spirochaetes through the medium. Spirochaetes have a spiral body and twist through the medium. These are from the termite Incisitermes. They have got trapped in a bend of a length of a trachea from their host flagellate. The spirochaetes move by turning, and in this case all of the spirochaetes were imaged while moving synchronously. Small Tricercomitus cells are attached to the top of the tracheae. Phase contrast.
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Thermocrinis, a filamentous prokaryote that occurs in the same habitats as Thermus. Image courtesy of the National Park Service.
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Gallionella (gally-on-elle-a) one of the iron bacteria, the bacteria attach to surfaces and grow producing a mucus sheath which acquires metal salts as it ages. The bacteria live in a fine tube in the centre of the filament. Phase contrast.
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Anacystis (a-na-cyst-is) is a cyanobacterium in which globular cells are located within a gelatinous matrix. Some of the cyanobacteria with this form can be toxic. Differential interference contrast.
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Skån Sø NØ Vinderup, Jylland, Danmark
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Photo credits. A, B, C, D, G – David Emerson; E, Wood’s Hole Oceanographic Institution; F, Clara Cha
EOL staff
Fe-oxidizing microbial matsFe-oxidizing microbial mats. A. Atypical freshwater iron mat in a slow-moving stream where Fe(II)-enriched groundwater is mixing with oxygenated surface water, resulting in growth of Fe-oxidizing bacteria and precipitation of iron oxides; B & C. phase contrast and epiflouresence images of the common sheath-forming Fe-oxidizer Leptothrix ochracea (bar = 5 µm); D, the stalk-forming Fe-oxidizer Gallionella ferruginea, note the bean-shaped cells in the process of cell division at the end of the Fe-oxide encrusted stalk (bar = 5 µm); E, an iron mat associated with a deep-sea hydrothermal vent (1000 mbsl) at Loihi Seamount; F, TEM image of biogenic oxides produced at Loihi, note the variety of helical stalks and tubular sheath-like filaments (bar = 10 µm); G, phase contrast image of unidentified Zetaproteobacteria that are marine Fe-oxidizers growing at the ends of iron-oxide filaments (cells denoted by arrows) from an in-situ incubation at Loihi (bar = 5 µm). Photo credits. A, B, C, D, G – David Emerson; E, Wood’s Hole Oceanographic Institution; F, Clara Chan
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Daphniae....
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Spirillum Tournoyani (Ehr.), magnified....
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Mount View Cedar Glade State Natural Area, Nashville, Davidson County, Tennessee, US
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Lardero, La Rioja, Spain
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Arredondo, Cantabria, Spain
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Arredondo, Cantabria, Spain
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Canada Del Hoyo, Castille la Mancha, Spain
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Muelas del Pan, Castille and Leon, Spain
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San Martin De Castaneda, Castille and Leon, Spain
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Vitoria, Basque Country, Spain
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Arredondo, Cantabria, Espaa
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A composite phase contrast micrograph of Mariprofundus ferrooxydans. The red arrows point to the bean shaped cells growing at the end of the stalk comprise primarily of iron oxyhydroxides. Note the cell recently divided causing a bifurcation in the stalk. Image courtesy of David Emerson
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Dozens of the curved bacteria fill the lumen of a gastric foveola. Hematoxylin & eosin stain, 1000X.
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Miranda do Douro, Bragana, Portugal
