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assaying
assaying , in metallurgy, process of determining the specific metallic content of an ore, alloy, or other substance, especially one containing precious metals. It consists, in some cases, of subjecting the substance to complete chemical analysis and, in others, of simply determining the quantity pre...
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John Torrey
John Torrey 1796-1873, American botanist and chemist, b. New York City, M.D. College of Physicians and Surgeons, 1818. He was professor of chemistry (1827-55) at his alma mater and professor of chemistry and natural history (1830-54) at Princeton. From 1853 he was chief assayer in the U.S. assay of...
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metabolism
metabolism sum of all biochemical processes involved in life. Two subcategories of metabolism are anabolism, the building up of complex organic molecules from simpler precursors, and catabolism , the breakdown of complex substances into simpler molecules, often accompanied by the release of energy...
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Angelus
Angelus [Lat.,=angel], daily prayer of the Roman Catholic Church, said usually three times daily, as announced by a bell, traditionally at six in the morning, at noon, and at six in the evening. It is said in honor of the Incarnation and consists of three repetitions of the Hail Mary together with ...
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Andreas Sigismund Marggraf
Andreas Sigismund Marggraf , 1709-82, German chemist, a pioneer in analytical chemistry. He proved that alumina, magnesia, and lime are distinct earths, found (1743) an improved method for the commercial preparation of phosphorus, and isolated (1746) zinc. In 1747 he announced his discovery of sugar...
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Riccardo Muti
Riccardo Muti , 1941-, Italian conductor. Principal conductor of the Maggio Musicale (1969-81) in Florence and of the Philharmonia Orchestra (1973-82) in London, he became (1977) principal guest conductor of the Philadelphia Orchestra and succeeded (1980) Eugene Ormandy as its musical director, a ...
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antidiuretic hormone
antidiuretic hormone , polypeptide hormone secreted by the posterior pituitary gland . Its principal action is to regulate the amount of water excreted by the kidneys. Antidiuretic hormone (ADH), known also as vasopressin, causes the kidneys to resorb water directly from the renal tubules, thus con...
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Menno Simons
Menno Simons , 1496?-1561, Dutch religious reformer. The name of the Mennonites was derived from his name, although he was not the actual founder of the sect. In 1524 he became a Roman Catholic priest but in 1536 he left the church when he announced that he no longer believed in infant baptism and...
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Jan Masaryk
Jan Masaryk , 1886-1948, Czechoslovak diplomat, son of Thomas G. Masaryk. He was (1925-38) Czechoslovak minister to Great Britain, and in London he became (1940) foreign minister in the Czechoslovak government in exile headed by Eduard Beneš after the German occupation of Czechoslovakia. Duri...
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Leo Hendrik Baekeland
Leo Hendrik Baekeland , 1863-1944, American chemist, b. Belgium, grad. Univ. of Ghent, 1882. In 1889 he emigrated to the United States. He founded (1893) and conducted, until 1899, when he sold the rights to Eastman, a company for producing a photographic paper of his own invention. In 1909 he annou...
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