DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Coloured transmission electron micrograph (TEM) of Cyanobacterium (Dermocarpa sp.). Thin section of the cell showing internal cellular details, such as, thylakoids (photosynthetic membranes), phycobilisomes, mesosomes, nucleoid regions containing DNA, polyhedral bodies, cell membrane and mucilaginous sheath (glycocalyx). This cyanobacterium (prokaryote) is a salt water, unicellular, endospore forming genus that reproduces by multiple fission producing motile baeocytes. Cyanobacteria are photosynthetic bacteria that inhabit both marine and freshwater environments. Certain members of the phylum Cyanophyta can undergo multiple fission and produce endospores (baeocytes, shown in this image) within the original parent cell wall and surrounding extracellular mucopolysaccharide matrix. Cyanobacteria are a significant component of the marine nitrogen cycle and an important primary producer in many areas of the ocean. Magnification: x5,335 when shortest axis.
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