DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Prokaryote and eukaryote cell types - bacterium (prokaryote - Moraxella catarrhalis); protozoan (eukaryote - Trypanosoma sp); human red blood cell (eukaryote), coloured scanning electron micrograph (SEM). The bacterium, Moraxella catarrhalis, is a prokaryotic, gram-negative, aerobic, diplococcus bacterium (formerly known as Branhamella catarrhalis). It may colonize and cause respiratory tract infections in humans. The trypanosome trypomastigote, Trypanosoma sp., is a eukaryotic, parasitic, hemoflagellated protozoan that causes trypanosomiasis (African sleeping sickness, Chagas disease). The human red blood cell (eukaryotic) is the most abundant type of cell in human blood, accounting for 40% of the blood volume. The red color comes from the iron-containing protein haemoglobin, which picks up oxygen in the lungs and distributes it around the body. Magnification: x2,285 when shortest axis printed at 25 millimetres.
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