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Augustus Allen Hayes
Augustus Allen Hayes (February 28, 1806 – June 21, 1882) was an American chemist. Biography Hayes was born in Windsor, Vt., Feb. 28, 1806. He was graduated from the Norwich military school in 1823, and studied chemistry under Prof. James Freeman Dana at Dartmouth, 1823–1826. Hayes was assistant professor of chemistry in the New Hampshire medical college, 1826–1828, and an expert chemist in Boston, Mass., 1828–1882. He was the discoverer of the organic alkaloid sanguinaria; invented in 1838 a novel arrangement of steam boilers for the economical generation of steam: and first suggested the application of oxides of iron in refining pig-iron; and a process for the production of saltpetre from sodium nitrate by the action of potassium hydroxide. Hayes was state assayer of Massachusetts, and he received the honorary degree of M.D. from Dartmouth in 1846. He died in Brookline, Mass., June 21, 1882. Publications Hayes the author of papers on: *''The Cause of the Color of La ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Windsor, Vermont
Windsor is a town in Windsor County, Vermont, United States. As the "Birthplace of Vermont", the town is where the Constitution of Vermont was adopted in 1777, thus marking the founding of the Vermont Republic, a sovereign state until 1791, when Vermont joined the United States. Over much of its history, Windsor was home to a variety of manufacturing enterprises. Its population was 3,559 at the 2020 census. History One of the New Hampshire grants, Windsor was chartered as a town on July 6, 1761, by colonial governor Benning Wentworth. It was first settled in August 1764 by Captain Steele Smith and his family from Farmington, Connecticut. In 1777, the signers of the Constitution of the Vermont Republic met at Old Constitution House, a tavern at the time, to declare independence from the Great Britain (the Vermont Republic would not become a state until 1791). In 1820, it was the state's largest town, a thriving center for trade and agriculture. In 1835, the first dam was built ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Freeman Dana
James Freeman Dana (born in Amherst, New Hampshire, 23 September 1793; died in New York City, 14 April 1827) was an American chemist. Biography He graduated from Harvard in 1813, and from the medical school in 1817. He studied with Dr. John Gorham, and developed such ability that in 1815 he was selected by the authorities of Harvard to procure for the chemical laboratory a new outfit of apparatus. For this purpose, he visited London, where for six months he worked in the laboratory of Friedrich Christian Accum. On his return to the United States he settled in Cambridge, where he practised medicine and was appointed assistant to the chair in chemistry. In 1817 he was invited to lecture on chemistry at Dartmouth, and in 1820 became the first professor of chemistry and mineralogy there. He was chosen professor of chemistry in the New York College of Physicians and Surgeons Columbia University Vagelos College of Physicians and Surgeons (VP&S) is the graduate medical school of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dartmouth College
Dartmouth College (; ) is a private research university in Hanover, New Hampshire. Established in 1769 by Eleazar Wheelock, it is one of the nine colonial colleges chartered before the American Revolution. Although founded to educate Native Americans in Christian theology and the English way of life, the university primarily trained Congregationalist ministers during its early history before it gradually secularized, emerging at the turn of the 20th century from relative obscurity into national prominence. It is a member of the Ivy League. Following a liberal arts curriculum, Dartmouth provides undergraduate instruction in 40 academic departments and interdisciplinary programs, including 60 majors in the humanities, social sciences, natural sciences, and engineering, and enables students to design specialized concentrations or engage in dual degree programs. In addition to the undergraduate faculty of arts and sciences, Dartmouth has four professional and graduate schools: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkaloid
Alkaloids are a class of basic, naturally occurring organic compounds that contain at least one nitrogen atom. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar structure may also be termed alkaloids. In addition to carbon, hydrogen and nitrogen, alkaloids may also contain oxygen, sulfur and, more rarely, other elements such as chlorine, bromine, and phosphorus.Chemical Encyclopedia: alkaloids xumuk.ru Alkaloids are produced by a large variety of organisms including , , Medicinal plant, plants, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sanguinarine
Sanguinarine is a polycyclic quaternary alkaloid. It is extracted from some plants, including the bloodroot plant, from whose taxonomic name, ''Sanguinaria canadensis,'' its name is drawn; the Mexican prickly poppy (''Argemone mexicana''); ''Chelidonium majus;'' and '' Macleaya cordata.'' Toxicity Sanguinarine is a toxin that kills animal cells through its action on the Na+/K+-ATPase transmembrane protein. Epidemic dropsy is a disease that results from ingesting sanguinarine. If applied to the skin, sanguinarine may cause a massive scab of dead flesh where it killed the cells where it was applied, called an ''eschar''. For this reason, sanguinarine is termed an escharotic. It is said to be 2.5 times more toxic than dihydrosanguinarine. Alternative medicine Native Americans once used sanguinarine in the form of bloodroot as a medical remedy, believing it had curative properties as an emetic, respiratory aid, and for a variety of ailments. In Colonial America, sanguinarine fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxide
An oxide () is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. "Oxide" itself is the dianion of oxygen, an O2– (molecular) ion. with oxygen in the oxidation state of −2. Most of the Earth's crust consists of oxides. Even materials considered pure elements often develop an oxide coating. For example, aluminium foil develops a thin skin of Al2O3 (called a passivation layer) that protects the foil from further corrosion.Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. . Stoichiometry (the measurable relationship between reactants and chemical equations of a equation or reaction) Oxides are extraordinarily diverse in terms of stoichiometries and in terms of the structures of each stoichiometry. Most elements form oxides of more than one stoichiometry. A well known example is carbon monoxide and carbon dioxide.Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pig Iron
Pig iron, also known as crude iron, is an intermediate product of the iron industry in the production of steel which is obtained by smelting iron ore in a blast furnace. Pig iron has a high carbon content, typically 3.8–4.7%, along with silica and other constituents of dross, which makes it brittle and not useful directly as a material except for limited applications. The traditional shape of the molds used for pig iron ingots is a branching structure formed in sand, with many individual ingots at right angles to a central channel or "runner", resembling a litter of piglets being nursed by a sow. When the metal had cooled and hardened, the smaller ingots (the "pigs") were simply broken from the runner (the "sow"), hence the name "pig iron". As pig iron is intended for remelting, the uneven size of the ingots and the inclusion of small amounts of sand cause only insignificant problems considering the ease of casting and handling them. History Smelting and producing wroug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niter
Niter or nitre is the mineral form of potassium nitrate, KNO3. It is a soft, white, highly soluble mineral found primarily in arid climates or cave deposits. Historically, the term ''niter'' was not well differentiated from natron, both of which have been very vaguely defined but generally refer to compounds of sodium or potassium joined with carbonate or nitrate ions. Characteristics Niter is a colorless to white mineral crystallizing in the orthorhombic crystal system. It is the mineral form of potassium nitrate, , and is soft (Mohs hardness 2), highly soluble in water, and easily fusible. Its crystal structure resembles that of aragonite, with potassium replacing calcium and nitrate replacing carbonate. It occurs in the soils of arid regions and as massive encrustations and efflorescent growths on cavern walls and ceilings where solutions containing alkali potassium and nitrate seep into the openings. It occasionally occurs as prismatic acicular crystal groups, and ind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Nitrate
Sodium nitrate is the chemical compound with the formula . This alkali metal nitrate salt is also known as Chile saltpeter (large deposits of which were historically mined in Chile) to distinguish it from ordinary saltpeter, potassium nitrate. The mineral form is also known as nitratine, nitratite or soda niter. Sodium nitrate is a white deliquescent solid very soluble in water. It is a readily available source of the nitrate anion (NO3−), which is useful in several reactions carried out on industrial scales for the production of fertilizers, pyrotechnics, smoke bombs and other explosives, glass and pottery enamels, food preservatives (esp. meats), and solid rocket propellant. It has been mined extensively for these purposes. History The first shipment of saltpeter to Europe arrived in England from Peru in 1820 or 1825, right after that country's independence from Spain, but did not find any buyers and was dumped at sea in order to avoid customs toll.Friedrich Georg Wieck, ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potassium Hydroxide
Potassium hydroxide is an inorganic compound with the formula K OH, and is commonly called caustic potash. Along with sodium hydroxide (NaOH), KOH is a prototypical strong base. It has many industrial and niche applications, most of which exploit its caustic nature and its reactivity toward acids. An estimated 700,000 to 800,000 tonnes were produced in 2005. KOH is noteworthy as the precursor to most soft and liquid soaps, as well as numerous potassium-containing chemicals. It is a white solid that is dangerously corrosive. Properties and structure KOH exhibits high thermal stability. Because of this high stability and relatively low melting point, it is often melt-cast as pellets or rods, forms that have low surface area and convenient handling properties. These pellets become tacky in air because KOH is hygroscopic. Most commercial samples are ca. 90% pure, the remainder being water and carbonates. Its dissolution in water is strongly exothermic. Concentrated aqueous solut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metallurgical Assay
A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality. Some assay methods are suitable for raw materials; others are more appropriate for finished goods. Raw precious metals (bullion) are assayed by an assay office. Silver is assayed by titration, gold by cupellation and platinum by inductively coupled plasma optical emission spectrometry (ICP OES). Precious metal items of art or jewelry are frequently hallmarked (depending upon the requirements of the laws of either the place of manufacture or the place of import). Where required to be hallmarked, semi-finished precious metal items of art or jewelry pass through the official testing channels where they are analyzed or assayed for precious metal content. While different nations permit a variety of legally acceptable finenesses, the assayer is actually testing to determine that the fineness of the product conforms with the statement or claim of fin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brookline, Massachusetts
Brookline is a town in Norfolk County, Massachusetts, Norfolk County, Massachusetts, in the United States, and part of the Greater Boston, Boston metropolitan area. Brookline borders six of Boston's neighborhoods: Brighton, Boston, Brighton, Allston, Fenway–Kenmore, Mission Hill, Boston, Mission Hill, Jamaica Plain, and West Roxbury. The city of Newton, Massachusetts, Newton lies to the west of Brookline. Brookline was first settled in 1638 as a Hamlet (place), hamlet in Boston, known as Muddy River; it was incorporated as a separate town in 1705. At the time of the 2020 United States Census, the population of the town was 63,191. It is the most populous municipality in Massachusetts to have a New England town, town (rather than city) form of government. History Once part of Algonquian peoples, Algonquian territory, Brookline was first settled by White people, European colonists in the early 17th century. The area was an outlying part of the colonial settlement of Boston a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
