describe nostoc cell structure
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Cells of Nostoc spp. are spherical, barrel-shaped, or oval forming unbranched filaments. The filaments (trichomes) may contain both heterocysts (thick walled, specialized N-fixing cells) and akinetes (thick walled cell which functions as a resting cell).
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Nostoc
Nostoc is a genus of filamentous nitrogen-fixing cyanobacteria that form macroscopic or microscopic colonies and is common in both terrestrial and aquatic environments (Potts, 2002).
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