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550 Madison Avenue is a postmodern skyscraper on Madison Avenue between 55th Street and 56th Street in New York City. Designed by Philip Johnson and John Burgee with associate architect Simmons Architects, the building was completed in 1984. It is a 647-foot-tall (197-meter), 37-story office tower with a facade made of pink granite. It was originally the headquarters of AT&T Corp., which relocated from 195 Broadway, the company's previous headquarters. Following the breakup of the Bell System in 1982, AT&T spun off subsidiary corporations and never occupied the entire building as it had originally intended. The building later became the American headquarters of Sony. An annex to the west was demolished and replaced in the early 2020s. Opinion of the building has been mixed ever since its design was first announced in March 1978. The New York City Landmarks Preservation Commission designated the building's exterior as a landmark in 2018. (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 4: Trianon Treaty Day in Romania (1920)
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HMS Malabar was a 74-gun ship of the line of the Royal Navy, launched in 1818 at Bombay Dockyard. In 1838, Malabar ran aground off Prince Edward Island in British North America and was damaged, with the loss of two crew members. She was refloated later that year and towed into Three Rivers in Lower Canada. In August 1843, Malabar, under the command of Sir George Sartorius, assisted in fighting a fire that destroyed the United States Navy sidewheel frigate USS Missouri at Gibraltar, taking aboard about 200 of that ship's survivors. Malabar was converted to a hulk in 1848, eventually becoming a coal hulk, and was renamed Myrtle in 1883. The hulk was sold out of the navy in 1905. This lithograph from around 1843 shows the crew of Malabar watching as Missouri explodes and burns in the distance. Lithograph credit: Thomas Goldsworthy Dutton, after Edward Duncan and George Pechell Mends; restored by Adam Cuerden Recently featured: Laothoe populi - Moissac Abbey - Jeremiah Gurney |
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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.