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Schistosoma mansoni is a water-borne parasite of humans, and belongs to the group of blood flukes (Schistosoma). The adult lives in the blood vessels (mesenteric veins) near the human intestine. It causes intestinal schistosomiasis (similar to S. japonicum, S. mekongi, S. guineensis, and S. intercalatum). Clinical symptoms are caused by the eggs.
The disease is especially common among children in underdeveloped and developing countries because these kids are more likely to play in contaminated water. [5] Schistosomiasis is also common among women, who may have greater exposure through daily chores that involve water, such as washing clothes and fetching water. [ 10 ]
Chlorite schist, a type of greenschist Greenschist (prasinite) at Cap Corse in Corsica, France Greenschist (epidote) from Itogon, Benguet, Philippines. Greenschists are metamorphic rocks that formed under the lowest temperatures and pressures usually produced by regional metamorphism, typically 300–450 °C (570–840 °F) and 2–10 kilobars (29,000–145,000 psi). [1]
Eggs are released in the feces of an infected host (raccoons and other mammals) and enter freshwaters such as streams, rivers, and lakes. Miracidium hatch from the egg and begin to actively search for a suitable intermediate host.
After a month, the sporocysts rupture and cercariae are liberated. Free cercariae penetrate the liver and move out of the snail into water. Each cercaria has a biforked tail with which it swims to find a human host. Again the cercariae are short lived and can survive in water for 4–6 days unless they find a human host. [27]
Some rock types containing chlorite, such as chlorite schist, have minor decorative uses or as construction stone. However, chlorite is a common mineral in clay, which has a vast number of uses. [9] Chlorite schist has been used as roofing granules, the mineral granules adhered to asphalt composition shingles due to the green color.
Soapstone (also known as steatite or soaprock) is a talc-schist, which is a type of metamorphic rock. It is composed largely of the magnesium -rich mineral talc . It is produced by dynamothermal metamorphism and metasomatism , which occur in subduction zones , changing rocks by heat and pressure, with influx of fluids but without melting.
Mineral qualifiers are important when naming a schist. For example, a quartz-feldspar-biotite schist is a schist of uncertain protolith that contains biotite mica, feldspar, and quartz in order of apparent decreasing abundance. [14] Lineated schist has a strong linear fabric in a rock which otherwise has well-developed schistosity. [10]