E. coli bacteria are seen after dividing. E. coli are common bacteria and most strains are harmless. They are also easy to duplicate and therefore are one of the best-studied prokaryotic organisms.
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An amoeba of the genus Chaos is seen. Chaos have hundreds of nuclei, while Amoeba have only one nucleus.
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A colorized transmission electron micrograph of a paramecium is seen. Paramecia are common in fresh water, especially in scums, but some have been found in salt water, too.
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A star-shaped marine diatom, found in Hawaii and magnified 100x is seen. Diatoms are microscopic, unicellular algae, abundant in marine and fresh water. The cell wall, or frustule, is composed of overlapping halves that fit tightly together, and contains silica (glass).
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A scanning electron micrograph of marine dinoflagellates, magnified 80x is seen. These are single-celled, photosynthetic protozoa that exist as plankton in water. This genus is characterized by hollow horns assisting in floatation, two flagella for self-propulsion, and thecal plates made of cellulose.
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A cyanobacterium, magnified 5335x is seen. Shown in this unicellular, endospore-forming, saltwater prokaryote are the thylakoids, phycobilisomes, mesosomes, nucleoids with DNA, polyhedral bodies, cell membrane, and mucilaginous sheath.
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A scanning electron micrograph of skeletons of diatoms is seen. Diatoms are eukaryotic algae, one of the most common types of phytoplankton.
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A micrograph of Bacteroides fragilis is seen, magnified 6240x.
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A photomicrograph of green algae is seen, magnified 40x.
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Diatoms are unicellular, eucariotic, photoautotrophic microorganisms like algae. They are the base of the food chain in different ecological systems. Furthermore they are suitable for biological indicators in water systems.
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Radiolarians are tiny protozoans that live exclusively in the ocean. Although they seem small to us, they are quite large compared to other protozoans. Some species are several millimeters in diameter. Radiolarian skeletons are amazingly complex.
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Protists such as these carry out all of life's fundamental processes within the confines of a single cell.
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Pictured is a single-celled protozoan parasite, Cryptosporidium.