Coccolithophores are microscopic algae that first appeared 220 million years ago, and flourished during the cretaceous period. They produce peculiar plates called cocoliths out of calcium carbonate, and incorporate them into an external shell. They constantly remove carbon from the atmosphere as they die and sink to the ocean floor, producing chalk. This is an important feedback system in the global carbon cycle. Seriously, how does cellular machinery produce these ...
Glassy Radiolarian Beauty The shells of radiolarians rank among some of the treasures of the ocean, with their intricate, gorgeous geometry. The shells are made of silica, which protects the single-celled animals as they drift as zooplankton in the ocean. This image, taken at 120x zoom, was an honorable mention in the 2012 Nikon Small World photomicrography competition.
46 Incredible Photos You May Not Have Seen Before. #22 Is Unbelievable.
Axones nerviosos - A cross section of a bundle of nerve fibers. Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells. Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.