Caption: Cyanobacterium (Nostoc spp.). Gram-negative, oxygenic, photosynthetic, filamentous cyanobacterium (prokaryote). Note the thylakoids (photosynthetic membranes - green), polyhedral bodies (purple) and lipid bodies (pink). Lichens often are associated with Nostoc in a symbiotic relationship. Specialized cells in the Nostoc filament, called heterocysts, fix atmospheric nitrogen gas into amino acids and thus progressively enrich the soil with nitrogen for plant growth.
Magnification*: x4,560
Type: TEM
Copyright 2003 Dennis Kunkel Microscopy, Inc.
Keywords: 47855C,03.01.03,aquatic,bacteria,bacterium,blue-green bacteria,cell wall,cyanobacteria,cyanobacterium,filament,filamentous,fresh water,Gram negative,Gram-negative,heterocyst,lichen,mucilage sheath,nitrogen fixation,nitrogen fixing,oxygenic,photosynthetic,polyhedryl body,soil bacteria,symbiotic,thylakoid,thylakoids,TEM