nostoc

nostoc anatomy heterocysts barrelshaped saxitoxins algal toxins dolichospermum freshwater cyanobacteria aquatic food chains filterfeeding zooplankton education cyano blue green research phytoplankton structure filament water prokaryotes laboratory background cyanobacterium interference microscopic anabaena colony scientific vegetative cell diagram microscope differential singlecelled algae plankton macro nature chlorophyll microbiology nucleus protozoa heterocyst euglena nitrogen fixation wall kingdom monera biological classification mucilage nous sheath filamentous biology bacteria chloroplast science mucilaginous human vector unicellular drawing parasite medicine isolated disease medical microorganism eubacteria