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Cyanothece
''Cyanothece'' is a unicellular, diazotrophic, oxygenic photosynthesizing cyanobacteria.
==Modern organisms and cellular organization==
In 1976, Jiří Komárek defined the prokaryotic cyanobacteria genus ''Cyanothece'' as distinct from ''Synechococcus'' NAG 1949. Organisms in both genera share characteristics in addition to being oxygenic phototrophs. They are both unicellular; forming aggregates but not found in mucilaginous colonies.〔〔 They may have a thin mucilage layer around each cell.〔 Both genera also divide by binary fission along an axis perpendicular to the cell’s longitudinal axis.〔
A handful of characteristics distinguish the two genera. While ''Synechococcus'' are usually cylindrical, ''Cyanothece'' are normally oval and longer than 3 μm.,〔〔 ''Cyanothece’s'' outer cell wall layer is relatively thick and contains spherical, glassy vesicles whose function has yet to be defined.〔 ''Cyanothece’s'' nucleoids are spread loosely throughout the cell, with a net-like appearance.〔〔 Instead of concentric thylakoid membranes that share a center or axis, ''Cyanothece’s'' exhibit short, wavy and radially arranged.,〔〔 All ''Cyanothece'' had nitrogenase activity at one time; although some strains have lost the necessary genes.〔 During nitrogen fixing conditions, ''Cyanothece'' create inclusion storage bodies under the control of a circadian rhythm.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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