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Spirostomum
''Spirostomum'' is a genus of ciliated protists that belongs to the class Heterotrichea. It is known for being very contractile.Fernandes, N.M.; da Silva Neto, I.D. (2013). “Morphology and 18S rDNA gene sequence of ''Spirostomum minus'' and ''Spirostomum teres'' (Ciliophora: Heterotrichea) from Rio de Janeiro, Brazil”. ''Zoologia'' 30: 72-79doi: 10.1590/S1984-46702013000100009 Having been first identified by Christian Gottfried Ehrenberg in 1834, further research has identified eight additional true morphospecies.Bishop, A. (1923). “Some observations upon ''Spirostomum ambiguum'' (Ehrenberg)”. ''Journal of Cell Science'' 267: 391-434doi: 10.1242/jcs.s2-67.267.391/ref>Fokin, S. (2004). “A brief history of ciliate studies (late XVII the first third of the XX century)”''Protistology'' 3: 283-296./ref>Boscaro, V.; Carducci, D.; Barbieri, G.; Senra, M.V.X.; Andreoli, I.; Erra, F.; Petroni, G.; Verni, F.; Fokin, S.I. (2014). “Focusing on genera to improve species identifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spirostomum Caudatum
''Spirostomum'' is a genus of ciliated protists that belongs to the class Heterotrich, Heterotrichea. It is known for being very contractile.Fernandes, N.M.; da Silva Neto, I.D. (2013). “Morphology and 18S rDNA gene sequence of ''Spirostomum minus'' and ''Spirostomum teres'' (Ciliophora: Heterotrichea) from Rio de Janeiro, Brazil”. ''Zoologia'' 30: 72-79doi: 10.1590/S1984-46702013000100009 Having been first identified by Christian Gottfried Ehrenberg in 1834, further research has identified eight additional true morphospecies.Bishop, A. (1923). “Some observations upon ''Spirostomum ambiguum'' (Ehrenberg)”. ''Journal of Cell Science'' 267: 391-434doi: 10.1242/jcs.s2-67.267.391/ref>Fokin, S. (2004). “A brief history of ciliate studies (late XVII the first third of the XX century)”''Protistology'' 3: 283-296./ref>Boscaro, V.; Carducci, D.; Barbieri, G.; Senra, M.V.X.; Andreoli, I.; Erra, F.; Petroni, G.; Verni, F.; Fokin, S.I. (2014). “Focusing on genera to improve spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spirostomum Subtilis
''Spirostomum'' is a genus of ciliated protists that belongs to the class Heterotrichea. It is known for being very contractile.Fernandes, N.M.; da Silva Neto, I.D. (2013). “Morphology and 18S rDNA gene sequence of ''Spirostomum minus'' and ''Spirostomum teres'' (Ciliophora: Heterotrichea) from Rio de Janeiro, Brazil”. ''Zoologia'' 30: 72-79doi: 10.1590/S1984-46702013000100009 Having been first identified by Christian Gottfried Ehrenberg in 1834, further research has identified eight additional true morphospecies.Bishop, A. (1923). “Some observations upon ''Spirostomum ambiguum'' (Ehrenberg)”. ''Journal of Cell Science'' 267: 391-434doi: 10.1242/jcs.s2-67.267.391/ref>Fokin, S. (2004). “A brief history of ciliate studies (late XVII the first third of the XX century)”''Protistology'' 3: 283-296./ref>Boscaro, V.; Carducci, D.; Barbieri, G.; Senra, M.V.X.; Andreoli, I.; Erra, F.; Petroni, G.; Verni, F.; Fokin, S.I. (2014). “Focusing on genera to improve species identifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterotrich
The heterotrichs are a class of ciliates. They typically have a prominent adoral zone of membranelles circling the mouth, used in locomotion and feeding, and shorter cilia on the rest of the body. Many species are highly contractile, and are typically compressed or conical in form. These include some of the largest protozoa, such as '' Stentor'' and '' Spirostomum'', as well as many brightly pigmented forms, such as certain '' Blepharisma''. Etymology The term ''heterotrich'' derives from the ancient Greek (), meaning "another, different", and , (), meaning 'hair', because of the contrast between the regular somatic ciliation and the one of the oral zone. Ultrastructure A number of ultrastructural details characterize the group. The cilia on the body are in dikinetids, in which either the anterior one or both kinetosomes may be ciliated, and which are associated with fibers composed of overlapping postciliary microtubules, called ''postciliodesmata'' and found only in thi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christian Gottfried Ehrenberg
Christian Gottfried Ehrenberg (19 April 1795 – 27 June 1876) was a German naturalist, zoologist, comparative anatomist, geologist, and microscopist. Ehrenberg was an evangelist and was considered to be of the most famous and productive scientists of his time. Early collections The son of a judge, Christian Gottfried Ehrenberg was born in Delitzsch, near Leipzig. He first studied theology at the University of Leipzig, then medicine and natural sciences in Berlin and became a friend of the famous explorer Alexander von Humboldt. In 1818, he completed his doctoral dissertation on fungi, ''Sylvae mycologicae Berolinenses.'' In 1820–1825, on a scientific expedition to the Middle East with his friend Wilhelm Hemprich, he collected thousands of specimens of plants and animals. He investigated parts of Egypt, the Libyan Desert, the Nile valley and the northern coasts of the Red Sea, where he made a special study of the corals. Subsequently, parts of Syria, Ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver
Silver is a chemical element with the Symbol (chemistry), symbol Ag (from the Latin ', derived from the Proto-Indo-European wikt:Reconstruction:Proto-Indo-European/h₂erǵ-, ''h₂erǵ'': "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc Refining (metallurgy), refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes bimetallism, alongside gold: while it is more abundant than gold, it is much less abundant as a native metal. Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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