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. This image was taken by Wolfgang Bettighofer. Image copyright by Wolfgang Bettighofer (www.protisten.de); image used under license to MBL.
download as pdf file
download large file
From the collection
Limnic and marine Protists of Northern Germany and the Alps
|Description of Achromatium oxaliferum: Achromatium oxaliferum was described by Schewiakoff (1893).Its large cells contain large CaCO3 inclusions occurring together with much smaller sulfur granules. The cells are spherical, ovoid, or cylindrical. Divisionis by constriction. The cells are slowly motile on solid surfaces only. Attempts at culture have been unsuccesful. A particular environment is apparently required by the sulfide-oxidizing, nonphotosynthetic bacteria such as Beggiatoa, Thiothrix, Achromatium, Macromonas, Thiovulum, Thiospira, and a few others. Their habitats appear to be areas where the gradients of both hydrogen sulfide and oxygen are overlapping or, as in running waters, where the hydrogen sulfide-providing sediment is covered by running water containing oxygen. |