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1849 In Science
The year 1849 in science and technology involved some significant events, listed below. Astronomy * Édouard Roche finds the limiting radius of tidal destruction and tidal creation for a body held together only by its self gravity, called the Roche limit, and uses it to explain why Saturn's rings do not condense into a satellite. Biology * Arnold Adolph Berthold pioneers endocrinology with his observations on the operation of the testicles in roosters. * Nikolai Annenkov begins publication of ''Flora Mosquensis Exsiccata'', the first Russian Flora. * Richard Owen publishes ''On the Nature of Limbs'' and begins publication of ''A History of British Fossil Reptiles''. * William Thompson (naturalist), William Thompson begins publication (in London) of ''The Natural History of Ireland'' with the first volume on birds. Chemistry * Charles-Adolphe Wurtz obtains methylamine. * Louis Pasteur discovers that the racemic form of tartaric acid is a mixture of the levorotatory and dextrot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Methylamine
Methylamine is an organic compound with a formula of . This colorless gas is a derivative of ammonia, but with one hydrogen atom being replaced by a methyl group. It is the simplest primary amine. Methylamine is sold as a solution in methanol, ethanol, tetrahydrofuran, or water, or as the anhydrous gas in pressurized metal containers. Industrially, methylamine is transported in its anhydrous form in pressurized railcars and tank trailers. It has a strong odor similar to rotten fish. Methylamine is used as a building block for the synthesis of numerous other commercially available compounds. Industrial production Methylamine is prepared commercially by the reaction of ammonia with methanol in the presence of an aluminosilicate catalyst. Dimethylamine and trimethylamine are co-produced; the reaction kinetics and reactant ratios determine the ratio of the three products. The product most favored by the reaction kinetics is trimethylamine. : In this way, an estimated 115,000 tons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Addison
Thomas J Addison (April 179329 June 1860) was an English physician, chef, and scientist. He is traditionally regarded as one of the "great men" of Guy's Hospital in London. Among other pathologies, he discovered Addison's disease (a degenerative disease of the adrenal glands) and Addisonian anemia (pernicious anemia), a hematological disorder later found to be caused by failure to absorb vitamin B12. Early years Thomas Addison was born in April 1793, but his exact birthdate is not known. He was born in Longbenton, near Newcastle upon Tyne, the son of Sarah and Joseph Addison, a grocer and flour dealer in Long Benton. He attended the local Thomas Rutter school and then went to the Royal Free Grammar School in Newcastle upon Tyne. He learned Latin so well that he made notes in Latin and spoke it fluently. Addison's father wanted him to become a lawyer, but he entered the University of Edinburgh Medical School in 1812 as a medical student. He became a member of the Royal Medic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physician
A physician (American English), medical practitioner (Commonwealth English), medical doctor, or simply doctor, is a health professional who practices medicine, which is concerned with promoting, maintaining or restoring health through the study, diagnosis, prognosis and treatment of disease, injury, and other physical and mental impairments. Physicians may focus their practice on certain disease categories, types of patients, and methods of treatment—known as specialities—or they may assume responsibility for the provision of continuing and comprehensive medical care to individuals, families, and communities—known as general practice. Medical practice properly requires both a detailed knowledge of the academic disciplines, such as anatomy and physiology, underlying diseases and their treatment—the ''science'' of medicine—and also a decent competence in its applied practice—the art or ''craft'' of medicine. Both the role of the physician and the meaning ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geneva, New York
Geneva is a City (New York), city in Ontario County, New York, Ontario and Seneca County, New York, Seneca counties in the U.S. state of New York (state), New York. It is at the northern end of Seneca Lake (New York), Seneca Lake; all land portions of the city are within Ontario County; the water portions are in Seneca County. The population was 13,261 at the 2010 census. The city is supposedly named after the city and canton of Geneva in Switzerland. The main settlement of the Seneca was spelled Zoneshio by early white settlers, and was described as being two miles north of Seneca Lake. The city borders, and was once part of, the town of Geneva (town), New York, Geneva. The city identifies as the "Lake Trout Capital of the World." History The area was long occupied by the Seneca tribe, which had established a major village of ''Kanadaseaga'' here by 1687. The British helped fortify the village against the French of Canada during the Seven Years' War (locally known as the Fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elizabeth Blackwell
Elizabeth Blackwell (3 February 182131 May 1910) was a British physician, notable as the first woman to receive a medical degree in the United States, and the first woman on the Medical Register of the General Medical Council for the United Kingdom. Blackwell played an important role in both the United States and the United Kingdom as a social awareness and moral reformer, and pioneered in promoting education for women in medicine. Her contributions remain celebrated with the Elizabeth Blackwell Medal, awarded annually to a woman who has made a significant contribution to the promotion of women in medicine. Blackwell was initially uninterested in a career in medicine, especially after her schoolteacher brought in a bull's eye to use as a teaching tool for studying the anatomy enabling vision. Therefore, she became a schoolteacher in order to support her family. This occupation was seen as suitable for women during the 1800s; however, she soon found it unsuitable for her. Blackw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
January 23
Events Pre-1600 * 393 – Roman emperor Theodosius I proclaims his eight-year-old son Honorius co-emperor. * 971 – Using crossbows, Song dynasty troops soundly defeat a war elephant corps of the Southern Han at Shao. *1264 – In the conflict between King Henry III of England and his rebellious barons led by Simon de Montfort, King Louis IX of France issues the Mise of Amiens, a one-sided decision in favour of Henry that later leads to the Second Barons' War. * 1368 – In a coronation ceremony, Zhu Yuanzhang ascends the throne of China as the Hongwu Emperor, initiating Ming dynasty rule over China that would last for three centuries. *1546 – Having published nothing for eleven years, François Rabelais publishes the ''Tiers Livre'', his sequel to '' Gargantua and Pantagruel''. *1556 – The deadliest earthquake in history, the Shaanxi earthquake, hits Shaanxi province, China. The death toll may have been as high as 830,000. *1570 &n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soliton
In mathematics and physics, a soliton or solitary wave is a self-reinforcing wave packet that maintains its shape while it propagates at a constant velocity. Solitons are caused by a cancellation of nonlinear and dispersive effects in the medium. (Dispersive effects are a property of certain systems where the speed of a wave depends on its frequency.) Solitons are the solutions of a widespread class of weakly nonlinear dispersive partial differential equations describing physical systems. The soliton phenomenon was first described in 1834 by John Scott Russell (1808–1882) who observed a solitary wave in the Union Canal in Scotland. He reproduced the phenomenon in a wave tank and named it the "Wave of Translation". Definition A single, consensus definition of a soliton is difficult to find. ascribe three properties to solitons: # They are of permanent form; # They are localized within a region; # They can interact with other solitons, and emerge from the collision unchanged, e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Gabriel Stokes
Sir George Gabriel Stokes, 1st Baronet, (; 13 August 1819 – 1 February 1903) was an Irish migration to Great Britain, Irish English physicist and mathematician. Born in County Sligo, Ireland, Stokes spent all of his career at the University of Cambridge, where he was the Lucasian Professor of Mathematics from 1849 until his death in 1903. As a physicist, Stokes made seminal contributions to fluid mechanics, including the Navier–Stokes equations; and to physical optics, with notable works on Polarization (waves), polarization and fluorescence. As a mathematician, he popularised "Stokes' theorem" in vector calculus and contributed to the theory of asymptotic expansions. Stokes, along with Felix Hoppe-Seyler, first demonstrated the oxygen transport function of hemoglobin and showed color changes produced by aeration of hemoglobin solutions. Stokes was made a baronet by the British monarch in 1889. In 1893 he received the Royal Society's Copley Medal, then the most prestigious ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stereochemistry
Stereochemistry, a subdiscipline of chemistry, involves the study of the relative spatial arrangement of atoms that form the structure of molecules and their manipulation. The study of stereochemistry focuses on the relationships between stereoisomers, which by definition have the same molecular formula and sequence of bonded atoms (constitution), but differ in structural formula (the three-dimensional orientations of their atoms in space). For this reason, it is also known as 3D chemistry—the prefix "stereo-" means "three-dimensionality". Stereochemistry spans the entire spectrum of organic, inorganic, biological, physical and especially supramolecular chemistry. Stereochemistry includes methods for determining and describing these relationships; the effect on the physical or biological properties these relationships impart upon the molecules in question, and the manner in which these relationships influence the reactivity of the molecules in question ( dynamic stereochemis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Rotation
Optical rotation, also known as polarization rotation or circular birefringence, is the rotation of the orientation of the plane of polarization about the optical axis of linearly polarized light as it travels through certain materials. Circular birefringence and circular dichroism are the manifestations of optical activity. Optical activity occurs only in chiral materials, those lacking microscopic mirror symmetry. Unlike other sources of birefringence which alter a beam's state of polarization, optical activity can be observed in fluids. This can include gases or solutions of chiral molecules such as sugars, molecules with helical secondary structure such as some proteins, and also chiral liquid crystals. It can also be observed in chiral solids such as certain crystals with a rotation between adjacent crystal planes (such as quartz) or metamaterials. When looking at the source of light, the rotation of the plane of polarization may be either to the right (dextrorotator ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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