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Achromatium oxaliferum (Schewiakoff 1893), a large colorless sulpher bacterium from bottom sediments of a stagnant freshwater pond near Boise, Idaho. Brightfield.
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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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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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Spirillum Tournoyani (Ehr.), magnified....
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Dozens of the curved bacteria fill the lumen of a gastric foveola. Hematoxylin & eosin stain, 1000X.
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Chromatium (chrome-ace-ee-um) is a red sulphur bacterium (or purple sulphur bacterium). It is found in sediments above the reduced zone. It uses solar energy to assist in the oxidation of hydrogen sulphide producing elemental sulphur which is deposited within the bacterial cell as sulphur granules. Photosynthetic pigments are pink which give the cell its distinctive colour. It is one of a variety of bacteria which metabolise sulphur compounds and deposit sulphur granules within the cells - both red (such as Thiocystis), and colourless (such as Beggiatoa, Achromatium, Thiovulvum, and others). Not all Chromatium are as large as this cell. Phase contrast.
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Achromatium oxaliferum (Schewiakoff 1893), a large colorless sulpher bacterium. The larger refractile spherical structures are calcite spherolites and the small globules adhering to them are granules of elemental sulphur. Collected from bottom sediments of a stagnant freshwater pond near Boise, Idaho.
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Accumulated accretions of iron bacteria found as epibionts on the leaves of the moss Hygrohypnum. Phase contrast.
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Phase contrast image of unidentified ZetaproteobacteriaPhase 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 credit– David Emerson.
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The organisms, scattered on and above the luminal surface, stain more boldly with the Giemsa technique. 1000X.
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Chromatium (chrome-ace-ee-um) and Thiocystis (thigh-o-cyst-is) - red sulphur bacteria (or purple sulphur bacteria). They are found in sediments above the reduced zone. Both use solar energy to assist in the oxidation of hydrogen sulphide producing elemental sulphur which is deposited within the bacterial cell as sulphur granules. Photosynthetic pigments are pink which give the cells their colour. Chromatium are the larger spherical and elongate cells with larger sulphur granules, Thiocystis are smaller are not easy to distinguish from the detritus. Differential Interference Contrast.
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Achromatium oxaliferum (Schewiakoff 1893), a large colorless sulpher bacterium from bottom sediments of a stagnant freshwater pond near Boise, Idaho. DIC.
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Gallionella, iron bacterium. The bacterium creates a filament which adheres to surfaces. Many filaments may form aggregates. The mucus secretions become brown, thicker and more brittle with age.
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Achromatium oxaliferum is a large colorless sulpher bacterium containing large refractile structures of calcite spherulites. Collected from bottom sediments of a rain storage reservoir in Kiel (Schleswig-Holstein, Germany). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.
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Gallionella, iron bacterium. The bacterium creates a filament which adheres to surfaces. Many filaments may form aggregates. The mucus secretions become brown, thicker and more brittle with age. Growing cells are to the left.
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Aeromonas hydrophilaAeromonas hydrophila isolated from blood culture from a patient with severe diarrhoea. Cultured on C.L.E.D. agar.28 February 2012.From
Wikimedia Commons
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Multilayer image shows cell in conjugation. Scale bar indicates 50 µm.Sample from ponds situated in the vicinity of Lake Constance (Bodensee, Southern Germany). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Iron impregnated capsules of Gallionella.
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Portrait of the colorless sulfur bacterium Beggiatoa alba (VAUCHER, 1803) TREVISAN, 1845.
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This image is of a thick brittle film of iron bacteria that formed over the surface of some water taken from the margins of the lake. The bacteria produce tubes of extracellular mucoid material that absorbs metal ions and becomes brown as it ages.