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The double sovereign is a gold coin of the United Kingdom with a nominal value of two pounds sterling (£2). It features the reigning monarch on its obverse and, most often, Benedetto Pistrucci's depiction of Saint George and the Dragon on the reverse (pictured). It was rarely issued in the first century and a half after its debut in 1820, usually in a new monarch's coronation year or to mark the institution of a new coinage portrait of the monarch. In addition to the usual coinage in Britain, specimens were struck at Australia's Sydney Mint in 1887 and 1902. Most often struck as a proof coin, the double sovereign has been issued for circulation in only four years, and few examples worn from commercial use are known. It is now a collector and bullion coin, and has been struck by the Royal Mint most years since 1980. In some years, it has not been issued and the Royal Mint instead placed gold versions of the commemorative £2 piece in the annual gold proof sets. (Full article...)
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In chemistry, an amino acid is a molecule containing both amine and carboxyl functional groups. In biochemistry, this term refers to alpha-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent.[1] In the alpha amino acids, the amino and carboxylate groups are attached to the same carbon, which is called the α–carbon. The various alpha amino acids differ in which side chain (R group) is attached to their alpha carbon. They can vary in size from just a hydrogen atom in glycine through a methyl group in alanine to a large heterocyclic group in tryptophan. Beyond the amino acids that are found in all forms of life, many non-natural amino acids have vital roles in technology and industry. For example, the chelating agents EDTA and nitrilotriacetic acid are alpha amino acids that are important in the chemical industry. (more...) Recently highlighted: Two-level utilitarianism – Islamic view of Ezra – Weapon dance |
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June 5: World Environment Day; Jerusalem Day in Israel (2024)
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The Douglas fir (Pseudotsuga menziesii) is an evergreen conifer species in the pine family, Pinaceae, which is native to western North America. The trees grow to a height of around 20 to 100 metres (70 to 330 feet) and commonly reach 2.4 metres (8 feet) in diameter. The largest coast Douglas firs regularly live for more than 500 years, with the oldest specimens more than 1,300 years old. The cones are pendulous and differ from true firs as they have persistent scales. The cones have distinctive long, trifid (three-pointed) bracts, which protrude prominently above each scale. The cones become tan when mature, measuring 6 to 10 centimetres (2+1⁄2 to 4 inches) long for coastal Douglas firs. This photograph shows a young female cone of the variety Pseudotsuga menziesii var. glauca (Rocky Mountain Douglas-fir), cultivated near Keila, Estonia. Photograph credit: Ivar Leidus Recently featured: HMS Malabar - Laothoe populi - Moissac Abbey |
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- ^ Proline is an exception to this general formula. It lacks the NH2 group because of the cyclization of the side chain.