title: Surface structure of Chromatium okenii and Chromatium weissei.
abstract: The outermost structured layer of both Chromatium weissei and C. okenii is composed of a hexagonal array of hollow cone-shaped subunits approximately 25 nm in length and 13 nm in diameter.
mesh_terms: D001431:Bacteriological Techniques; D002473:Cell Wall; D002844:Chromatium / Q000166:cytology*; D005613:Freeze Etching; D005615:Freezing; D008854:Microscopy, Electron; D010772:Phosphotungstic Acid; D013045:Species Specificity; D014871:Water Microbiology
chemical_list: D010772:Phosphotungstic Acid