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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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Galende, Castile and Len, Spain
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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.
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A mass of bacterial endosymbiont Holospora undulata (ex Hafkine, 1890) Gromov and Ossipov, 1981occupying the micronucleus of Paramecium caudatum (Ehrenberg,1833).DIC. A detailed discussion of the genus Holospora is available at http://141.150.157.117:8080/prokPUB/chaprender/jsp/showchap.jsp?chapnum=355&initsec=01_00
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A mass of bacterial endosymbiont Holospora undulata (ex Hafkine, 1890) Gromov and Ossipov, 1981occupying the micronucleus of Paramecium caudatum (Ehrenberg,1833).DIC. A detailed discussion of the genus Holospora is available at http://141.150.157.117:8080/prokPUB/chaprender/jsp/showchap.jsp?chapnum=355&initsec=01_00
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These cells of the endosymbiont Holospora undulata (ex Hafkine, 1890) Gromov and Ossipov, 1981are escaping from the micronucleus of a ruptured cell of the host, Paramecium caudatum (Ehrenberg,1833). Phase contrast.