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Indian Yellow
Indian yellow is a complex pigment consisting primarily of euxanthic acid salts (magnesium euxanthate and calcium euxanthate), euxanthone and sulphonated euxanthone. It is also known as purree, snowshoe yellow, gaugoli, gogili, Hardwari peori, Monghyr puri, peoli, peori, peri rung, pioury, piuri, purrea arabica, pwree, jaune indien (French, Dutch), Indischgelb (German), yìndù huáng (Chinese), giallo indiano (Italian), amarillo indio (Spanish). The crystalline form dissolved in water or mixed with oil to produce a transparent yellow paint which was used in Indian frescoes, oil painting and watercolors. After application Indian yellow produced a clear, deep and luminescent orange-yellow color which, due to its fluorescence, appears especially vivid and bright in sunlight. It was said to be of a disagreeable odour. It was most used in India in the Mughal period and in Europe in the nineteenth century, before becoming commercially unavailable circa 1921. The origin and manufact ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dresden University Of Technology
TU Dresden (for german: Technische Universität Dresden, abbreviated as TUD and often wrongly translated as "Dresden University of Technology") is a public research university, the largest institute of higher education in the city of Dresden, the largest university in Saxony and one of the 10 largest universities in Germany with 32,389 students . The name Technische Universität Dresden has only been used since 1961; the history of the university, however, goes back nearly 200 years to 1828. This makes it one of the oldest colleges of technology in Germany, and one of the country’s oldest universities, which in German today refers to institutes of higher education that cover the entire curriculum. The university is a member of TU9, a consortium of the nine leading German Institutes of Technology. The university is one of eleven German universities which succeeded in the Excellence Initiative in 2012, thus getting the title of a "University of Excellence". The TU Dresden succee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mango
A mango is an edible stone fruit produced by the tropical tree ''Mangifera indica''. It is believed to have originated in the region between northwestern Myanmar, Bangladesh, and northeastern India. ''M. indica'' has been cultivated in South and Southeast Asia since ancient times resulting in two types of modern mango cultivars: the "Indian type" and the "Southeast Asian type". Other species in the genus ''Mangifera'' also produce edible fruits that are also called "mangoes", the majority of which are found in the Malesian ecoregion. Worldwide, there are several hundred cultivars of mango. Depending on the cultivar, mango fruit varies in size, shape, sweetness, skin color, and flesh color which may be pale yellow, gold, green, or orange. Mango is the national fruit of India, Pakistan and the Philippines, while the mango tree is the national tree of Bangladesh. Etymology The English word ''mango'' (plural "mangoes" or "mangos") originated in the 16th century from the Por ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victoria Finlay
Victoria Finlay is a British writer and journalist, known for her books on colour and jewels. Her most famous book is ''Colour: Travels Through The Paint Box''. Career Finlay studied social anthropology at St Andrew's University, Scotland, and the College of William & Mary, Virginia, after which she joined Reuters.Palmer, M and Finlay, V. (2003) Faith in Conservation; New Approaches to Religions and the Environment, Washington DC, The World Bank, p157 From 1991 to 2003 Finlay worked in Hong Kong as a journalist. By the time of the handover in 1997, she was arts editor of the ''South China Morning Post''. Finlay had become obsessed with colour as a child, when her father took her to Chartres Cathedral and said that people were no longer able to make the blue in the stained glass. In 2000, she decided it was time to go and find out this and other secrets of colour, and ''Colour: Travels through the Paintbox'' was published in 2002. Finlay has also worked in radio presenting, and w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnesium Oxide
Magnesium oxide ( Mg O), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2− ions held together by ionic bonding. Magnesium hydroxide forms in the presence of water (MgO + H2O → Mg(OH)2), but it can be reversed by heating it to remove moisture. Magnesium oxide was historically known as magnesia alba (literally, the white mineral from Magnesia), to differentiate it from ''magnesia negra'', a black mineral containing what is now known as manganese. Related oxides While "magnesium oxide" normally refers to MgO, the compound magnesium peroxide MgO2 is also known. According to evolutionary crystal structure prediction, MgO2 is thermodynamically stable at pressures above 116 GPa (gigapascals), and a semiconducting suboxide Mg3O2 is thermodynamically stable above 500 GPa. Because of its stability, MgO is used as a model sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gallstone
A gallstone is a calculus (medicine), stone formed within the gallbladder from precipitated bile components. The term cholelithiasis may refer to the presence of gallstones or to any disease caused by gallstones, and choledocholithiasis refers to the presence of migrated gallstones within bile ducts. Most people with gallstones (about 80%) are asymptomatic. However, when a gallstone obstructs the bile duct and causes acute cholestasis, a reflexive smooth muscle spasm often occurs, resulting in an intense cramp-like visceral pain in the quadrant (abdomen), right upper part of the abdomen known as a biliary colic (or "gallbladder attack"). This happens in 1–4% of those with gallstones each year. Complications from gallstones may include inflammation of the gallbladder (cholecystitis), inflammation of the pancreas (pancreatitis), Jaundice#Post-hepatic, obstructive jaundice, and infection in bile ducts (ascending cholangitis, cholangitis). Symptoms of these complications may include ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castor Oil
Castor oil is a vegetable oil pressed from castor beans. It is a colourless or pale yellow liquid with a distinct taste and odor. Its boiling point is and its density is 0.961 g/cm3. It includes a mixture of triglycerides in which about 90% of fatty acids are ricinoleates. Oleic acid and linoleic acid are the other significant components. Castor oil and its derivatives are used in the manufacturing of soaps, lubricants, hydraulic and brake fluids, paints, dyes, coatings, inks, cold-resistant plastics, waxes and polishes, nylon, and perfumes. Etymology The name probably comes from a confusion between the ''Ricinus'' plant that produces it and another plant, the ''Vitex agnus-castus''. An alternative etymology, though, suggests that it was used as a replacement for castoreum. Composition Castor oil is well known as a source of ricinoleic acid, a monounsaturated, 18-carbon fatty acid. Among fatty acids, ricinoleic acid is unusual in that it has a hydroxyl functional gro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philosophical Magazine
The ''Philosophical Magazine'' is one of the oldest scientific journals published in English. It was established by Alexander Tilloch in 1798;John Burnett"Tilloch, Alexander (1759–1825)" Oxford Dictionary of National Biography, Oxford University Press, Sept 2004; online edn, May 2006, accessed 17 Feb 2010 in 1822 Richard Taylor became joint editor and it has been published continuously by Taylor & Francis ever since. Early history The name of the journal dates from a period when "natural philosophy" embraced all aspects of science. The very first paper published in the journal carried the title "Account of Mr Cartwright's Patent Steam Engine". Other articles in the first volume include "Methods of discovering whether Wine has been adulterated with any Metals prejudicial to Health" and "Description of the Apparatus used by Lavoisier to produce Water from its component Parts, Oxygen and Hydrogen". 19th century Early in the nineteenth century, classic papers by Humphry Davy, M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Stenhouse
John Stenhouse FRS FRSE FIC FCS (21 October 1809 – 31 December 1880) was a Scottish chemist. In 1854, he invented one of the first practical respirators. He was a co-founder of the Chemical Society in 1841. Life John Stenhouse was born in Barrhead in Glasgow on 21 October 1809. He was the eldest son of William Stenhouse, a calico-printer in the family firm of John Stenhouse & Co of 302 High Street, Glasgow, and Elizabeth Currie; he was the only one of their children to survive beyond infancy. After education at the Glasgow Grammar School, he studied at the University of Glasgow from 1824 to 1828. Initially he intended to pursue a career in literature, but later his interests switched to chemistry, which he studied first under Professor Thomas Graham at the university and then under Dr. Thomas Thomson at Anderson's University in Glasgow (now part of the University of Strathclyde, one of whose buildings is named after him). During 1837–1839, he attended the che ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Memecylon
''Memecylon'' is a plant group in Melastomataceae. It consists of 350-400 species of small to medium-sized trees and shrubs occurring in the Old World tropics. ''Memecylon'' is a monophyletic group basal to the Melastomataceae clade. ''Memecylon'' taxa have more than 600 published basionyms. Diversity of this group is concentrated in tropical Africa, Madagascar, Sri Lanka, India and Malaysia. Etymology The name ''Memecylon'' is derived from 'memaecylon' as used by ancient Greek philosophers Dioscorides and Pliny to describe the red fruits of ''Arbutus unedo'' (oriental strawberry tree), an unrelated plant group, alluding to the pink to reddish berries often produced by ''Memecylon''. Some vernacular names in different regions of the world are given below. English: "Blue mist plant", Hindi: ''Anjan''; Malayalam: ''Aattukanala'' റ്റുകനല ''Kaasaavu'': ാശാവ് ''Kaayaampoo'': ായാമ്പൂ Odia: ''Neymaru''; Sinhala: ''Korakaha'', Welikaha; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Léonor Mérimée
Jean-François Léonor Mérimée (16 September 1757, Broglie - 26 September 1836, Paris) was a French writer, painter and chemist, specializing in pigment color in painting and decorative art. He was the father of the famous author, Prosper Mérimée. Biography His father was François Merimée (c. 1715-1795), a lawyer at the Parlement de Rouen and author of ''"Treatise on fiefs and feudal rights in Normandy according to the natural order of matters and procedure divided into 5 parts'' (1760). He also served as a steward for the Maréchal de Broglie. He studied at the Collège de Caen before entering the Académie royale de peinture in 1778, where he studied with Gabriel-François Doyen and François-Élie Vincent. His fellow students included Charles Meynier, Jacques-Augustin-Catherine Pajou and Charles Thévenin. In 1787, he was awarded second place in the Prix de Rome and achieved third place in 1788. This was followed by a trip to Holland, where he studied the Du ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hippuric Acid
Hippuric acid ( Gr. ''hippos'', horse, ''ouron'', urine) is a carboxylic acid and organic compound. It is found in urine and is formed from the combination of benzoic acid and glycine. Levels of hippuric acid rise with the consumption of phenolic compounds (such as fruit juice, tea and wine). The phenols are first converted to benzoic acid, and then to hippuric acid and excreted in urine. Hippuric acid crystallizes in rhombic prisms which are readily soluble in hot water, melt at 187 °C, and decompose at about 240 °C. High concentrations of hippuric acid may also indicate a toluene intoxication; however, scientists have called this correlation into question because there are other variables that affect levels of hippuric acid. When many aromatic compounds such as benzoic acid and toluene are taken internally, they are converted to hippuric acid by reaction with the amino acid, glycine. Synthesis A modern synthesis of hippuric acid involves the acylation of glycin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Gräbe
Carl Gräbe (; 24 February 1841 – 19 January 1927) was a German industrial and academic chemist from Frankfurt am Main who held professorships in his field at Leipzig, Königsberg, and Geneva. He is known for the first synthesis of the economically important dye, alizarin, with Liebermann, and for contributing to the fundamental nomenclature of organic chemistry. Biography Gräbe was born in Frankfurt in 1841. He studied at a vocational high school in Frankfurt and Karlsruhe Polytechnic and in Heidelberg. Later he worked for the chemical company ''Meister Lucius und Brüning'' (today Hoechst AG). He supervised the production of Fuchsine and researched violet colorants made using iodine. The work with iodine resulted in eye problems, so he returned to academia. Carl Gräbe received his Ph.D. from the University of Heidelberg in 1862 under the supervision of Robert Wilhelm Bunsen. In 1868 he wrote his habilitation, and became a professor in Leipzig. Gräbe wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
