nodularia sp. toxic algae under microscopic view x40, dark background

nodularia sp toxic algae microscopic view x40 dark background pattern alga algal pollution aquaculture bacteria bacterial bio biological biology bluegreen cell chemical colony color culture cyanobacteria cyanobacterium experiment freshwater green infected infectious lab laboratory lake macro medical medicine micro microbiology microcystis microorganism microscope phytoplankton plankton plant pond preparation research river science sickness slides stem toxin underwater virus water