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ATKT00 - Licenced Description Astronomy Associate Atmosphere Atmospheric Bacteria Bacterial Bacterial Forms Bacteriology Bacterium Biological Biology Blue Green Alga Blue Green Algae Body Celestial Phenomena Celestial Phenomenon Cell Cell Structure Cellular Chemical Chemistry Chloroplast Concept Cyanobacteria Cyanobacterium Cytology Cytoplasm Cytoplasmic Electron Micrograph Element EM Enrich Eubacteria Eukaryotae Eukaryote Filamentous Fix Geological Geologic Geology Gram Negative Gram Negative Gram Negative Bacteria Heterocyst Lichen Life Science Mathematical Form Math Related Concept Membrane Membranous Metabolic Metabolism Microbiology Micrograph Micrography Microscopy Monera Nitrogen Nostoc Nostocales Nostocaceae Organelle Organism Oxygenic Photosynthesis Photosynthesis Photosynthetic Physiological Physiology Plant Plastid Polyhedral Polyhedron Prokaryote Prokaryotes Progressive Prokaryotae Protoplasm Relationship Science Soil Specialized Specialize Symbiont Symbiosis Symbiotic TEM Thallophyta Thallophyte Thallophytic Thylakoids Transmission Electron Transmission EM of a cyanobacterium Nostoc sp mag 4560x at 24 x 36 mm a gram negative oxygenic photosynthetic filamentous eubacterium Note the thylakoids photosynthetic membranes and polyhedral bodies Lichens often associate with Nostoc in symbioses Specialized cells heterocysts fix atmospheric nitrogen and progressively enrich the soil with nitrogen