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Thecamoeba (theek-a-me-ba) a naked amoeba, in which the surface seems relatively thick and stiff and is often thrown into folds (not visible here). Hyaline regions are the clear areas upper left and right. Phase contrast. Material from Nymph Creek and Nymph Lake, thermal sites in Yellowstone National Park, photograph by Kathy Sheehan and David Patterson.
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Thecamoeba (theek-a-me-ba) naked amoeba, moves forward as if a single pseudopodium, typically with broad hyaline zone at the front end, and distinguished by having longitudinal folds on the body. Phase contrast micrograph.
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Thecamoeba is a naked amoeba with a relatively stiff surface. This one, found in Obsidian Creek, has long, extended pseudopodia that are used to trap food. The round structure towards the back of the cell is the contractile vacuole that helps to control the water content of the cell. Anterior to the contractile vacuole is the nucleus with a large nucleolus.
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Thecamoeba, a flattened naked amoeba with a cell covering of thick mucoprotein, which is thrown up into longitudinal folds. Locomotion is monopodial. The broadly rounded pseudopod has a prominent hyaline cap. Crystalline cytoplasmic inclusions and a large posterior contractile vacuole are seen in this image. The morphology of the nucleus, important for species identification, is not well seen here. From fresh water pond near Boise, Idaho. Phase contrast.
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Acanthamoeba (a-can-tha-me-ba), collection of cysts. Irregular shape of cyst wall and with pores is characteristics of this and closely related genera. Differential interference contrast.
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Acanthamoeba (a-can-tha-me-ba), fine extensions are referred to as subpseudopodia, because they emerge from the hyaline cap. Anterior is to north. Nucleus with dark nucleolus is in the centre of the cell. Large vacuole near base of cell is the contractile vacuole. Phase contrast.
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Acanthamoeba (a-can-tha-me-ba), detail of hyaline cap with subpseudopodia. Nucleus also evident. Differential interference contrast.
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Protacanthamoeba (prote-a-can-tha-me-ba), free-living lobose amoeba with extensive hyaline zone and fine subpseudopodia arising from the margins of the cell. Trophic cells and cysts, contractile vacuole and nuclei visible in both. Phase contrast.
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Balamuthia (bah-lah-moo-thee-a) is an amoeba which was first isolated as an infectious agent of primate (not human) brains. Irregular appearance. Differential interference contrast.
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Magnified 250X, this photomicrograph revealed the presence of Acanthamoeba sp. parasitic microorganisms, which were found in a specimen of human H&E-stained adrenal gland tissue.Acanthamoeba is a microscopic, free-living ameba that is relatively common in the environment. This ameba has been isolated from water (including natural and treated water in pools or hot tubs), soil, air (in association with cooling towers, heating, ventilation and air conditioner [HVAC] systems), sewage systems, and drinking water systems (shower heads, taps). Most people will be exposed to Acanthamoeba during their lifetime and will not get sick. However, Acanthamoeba is capable of causing several infections in humans.Created: 1975
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Balamuthia (bah-lah-moo-thee-a) is an amoeba which was first isolated as an infectious agent of primate (not human) brains. Irregular appearance. This image shows various cysts. Differential interference contrast.
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Magnified 1000X, this photomicrograph revealed the presence of Acanthamoeba sp. parasitic microorganisms, which were found in a specimen of human H&E-stained adrenal gland tissue.Acanthamoeba is a microscopic, free-living ameba that is relatively common in the environment. This ameba has been isolated from water (including natural and treated water in pools or hot tubs), soil, air (in association with cooling towers, heating, ventilation and air conditioner [HVAC] systems), sewage systems, and drinking water systems (shower heads, taps). Most people will be exposed to Acanthamoeba during their lifetime and will not get sick. However, Acanthamoeba is capable of causing several infections in humans.Created: 1975
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This photomicrograph depicted a magnified view of brain tissue within which was a centrally located Acanthamoeba sp. cyst. Acanthamoeba spp. are opportunistic free-living amebae, capable of causing granulomatous amebic encephalitis (GAE) in individuals with compromised immune systems.Created: 1977
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Magnified 500X, this 1973 photomicrograph depicted a mouse brain tissue specimen stained using the hematoxylin and eosin (H&E) staining technique, and revealing the presence of Acanthamoeba polyphaga protozoa.Acanthamoeba is a microscopic, free-living ameba commonly found in the environment that can cause rare but severe illness. Acanthamoeba causes three main types of illness involving the eye (keratitis), the brain and spinal cord (Granulomatous Amebic Encephalitis), and infections that can spread from an entry point to the entire body (disseminated disease).Created: 1973
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Comandonia (come-and-own-ee-a) - one of the acanthamoebid amoebae, with a hyaline region from which some fine subpseudopodia may emerge. This cell has a well developed hyaline region and the contractile vacuole is also evident. Distinguished by leaving the cyst through an operculum. Phase contrast.
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Magnified 1200X, this 1973 photomicrograph depicted a mouse brain tissue specimen stained using the hematoxylin and eosin (H&E) staining technique, and revealing the presence of Acanthamoeba polyphaga protozoa.Acanthamoeba is a microscopic, free-living ameba commonly found in the environment that can cause rare but severe illness. Acanthamoeba causes three main types of illness involving the eye (keratitis), the brain and spinal cord (Granulomatous Amebic Encephalitis), and infections that can spread from an entry point to the entire body (disseminated disease).Created: 1973
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Magnified 500X, this 1973 photomicrograph depicted a mouse brain tissue specimen stained using the hematoxylin and eosin (H&E) staining technique, revealing the presence of Acanthamoeba polyphaga protozoa.Acanthamoeba is a microscopic, free-living ameba commonly found in the environment that can cause rare but severe illness. Acanthamoeba causes three main types of illness involving the eye (keratitis), the brain and spinal cord (Granulomatous Amebic Encephalitis), and infections that can spread from an entry point to the entire body (disseminated disease).Created: 1973
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