Gammaproteobacteria

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.

Achromatium oxaliferum (Schewiakoff 1893), a large colorless sulpher bacterium from bottom sediments of a stagnant freshwater pond near Boise, Idaho. Brightfield.

Aeromonas hydrophilaAeromonas hydrophila. Gram stain.1977From Wikimedia Commons

Canada Del Hoyo, Castille la Mancha, Spain

Common nameBacterial leaf streakScientific nameXanthomonas oryzae pv. oryzicola (Fang et al.) Swings et al.Part of the image collection of the International Rice Research Institute (IRRI).

Villoslada de Cameros, La Rioja, Spain

Bacterial sheath brown rot.Part of the image collection of the International Rice Research Institute (IRRI).

Jason Sharp;Myakka, Manatee County, Florida

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.

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.

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

Caada del Hoyo, Castilla-La Mancha, Espaa

Common nameBacterial leaf streakScientific nameXanthomonas oryzae pv. oryzicola (Fang et al.) Swings et al.Part of the image collection of the International Rice Research Institute (IRRI).

Bacterial sheath brown rot.Part of the image collection of the International Rice Research Institute (IRRI).

Achromatium oxaliferum (Schewiakoff 1893), a large colorless sulpher bacterium from bottom sediments of a stagnant freshwater pond near Boise, Idaho. DIC.

Galende, Castile and Len, Spain

Bacterial blight.Part of the image collection of the International Rice Research Institute (IRRI).

Bacterial sheath brown rot.Part of the image collection of the International Rice Research Institute (IRRI).

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.

Common nameBacterial leaf streakScientific nameXanthomonas oryzae pv. oryzicola (Fang et al.) Swings et al.gen3rkb.irri.org/training/fact-sheets/pest-management/dis... Part of the image collection of the International Rice Research Institute (IRRI).

Bacterial sheath brown rot.Part of the image collection of the International Rice Research Institute (IRRI).

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.