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Fritz Weigert
Fritz Weigert (18 September 1876 – 13 April 1947) was a German physical chemist. Weigert has made major contributions in the field of photochemistry. He was born in Berlin. He was the nephew of both Karl Weigert and Paul Ehrlich. He was married to Margarete Behmer. Around 1908, he began teaching and conducting research at Berlin University - after studying there. He was a photochemistry professor at Leipzig University from 1914 until being, like other Jewish scientists, forced out by the Nazis in 1934. On January 1, 1935, he immigrated to England and in 1936 was director of the Physiochemical Department of the Cancer Research Institute at Mount Vernon Hospital Mount Vernon Hospital is located in Northwood, an area of north-west Greater London. It is one of two hospitals run by The Hillingdon Hospitals NHS Foundation Trust. History The hospital was founded as The North London Hospital for Co ..., Northwood. He elucidated the metabolism of the carcinogenic hydrocar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemist
A chemist (from Greek ''chÄ“m(Ãa)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe the properties they study in terms of quantities, with detail on the level of molecules and their component atoms. Chemists carefully measure substance proportions, chemical reaction rates, and other chemical properties. In Commonwealth English, pharmacists are often called chemists. Chemists use their knowledge to learn the composition and properties of unfamiliar substances, as well as to reproduce and synthesize large quantities of useful naturally occurring substances and create new artificial substances and useful processes. Chemists may specialize in any number of subdisciplines of chemistry. Materials scientists and metallurgists share much of the same education and skills with chemists. The work of chemists is often related to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photochemistry
Photochemistry is the branch of chemistry concerned with the chemical effects of light. Generally, this term is used to describe a chemical reaction caused by absorption of ultraviolet (wavelength from 100 to 400 nm), visible light (400–750 nm) or infrared radiation (750–2500 nm). In nature, photochemistry is of immense importance as it is the basis of photosynthesis, vision, and the formation of vitamin D with sunlight. Photochemical reactions proceed differently than temperature-driven reactions. Photochemical paths access high energy intermediates that cannot be generated thermally, thereby overcoming large activation barriers in a short period of time, and allowing reactions otherwise inaccessible by thermal processes. Photochemistry can also be destructive, as illustrated by the photodegradation of plastics. Concept Grotthuss–Draper law and Stark-Einstein law Photoexcitation is the first step in a photochemical process where the reactant is elevated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karl Weigert
Karl Weigert, Carl Weigert (19 March 1845 in Münsterberg in Silesia – 5 August 1904 in Frankfurt am Main) was a German Jewish pathologist. His nephew was Fritz Weigert and his cousin was Paul Ehrlich. He received his education at the universities of Berlin, Vienna, and Breslau, graduating in 1868. After having taken part in the Franco-Prussian war as assistant surgeon, he settled in Breslau, and for the following two years, was an assistant to Heinrich Waldeyer; from 1870 to 1874 to Hermann Lebert, and then to Julius Cohnheim, who he followed to the University of Leipzig in 1878. There he became an associate professor of pathology in 1879. In 1884, he was appointed professor of pathological anatomy at the Senkenbergsche Stiftung in Frankfurt am Main, and received the title of "Geheimer Medizinal-Rat" in 1899. He is buried in Old Jewish Cemetery, Frankfurt (Juedischer Friedhof Rat-Beil-Straße). Weigert assisted Cohnheim in many of his researches, and wrote much on t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Ehrlich
Paul Ehrlich (; 14 March 1854 – 20 August 1915) was a Nobel Prize-winning German physician and scientist who worked in the fields of hematology, immunology, and antimicrobial chemotherapy. Among his foremost achievements were finding a cure for syphilis in 1909 and inventing the precursor technique to Gram staining bacteria. The methods he developed for staining tissue made it possible to distinguish between different types of blood cells, which led to the ability to diagnose numerous blood diseases. His laboratory discovered arsphenamine (Salvarsan), the first effective medicinal treatment for syphilis, thereby initiating and also naming the concept of chemotherapy. Ehrlich popularized the concept of a magic bullet. He also made a decisive contribution to the development of an antiserum to combat diphtheria and conceived a method for standardizing therapeutic serums. In 1908, he received the Nobel Prize in Physiology or Medicine for his contributions to immunology. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berlin University
Humboldt-Universität zu Berlin (german: Humboldt-Universität zu Berlin, abbreviated HU Berlin) is a German public research university in the central borough of Mitte in Berlin. It was established by Frederick William III on the initiative of Wilhelm von Humboldt, Johann Gottlieb Fichte and Friedrich Ernst Daniel Schleiermacher as the University of Berlin () in 1809, and opened in 1810, making it the oldest of Berlin's four universities. From 1828 until its closure in 1945, it was named Friedrich Wilhelm University (german: Friedrich-Wilhelms-Universität). During the Cold War, the university found itself in East Berlin and was ''de facto'' split in two when the Free University of Berlin opened in West Berlin. The university received its current name in honour of Alexander and Wilhelm von Humboldt in 1949. The university is divided into nine faculties including its medical school shared with the Freie Universität Berlin. The university has a student enrollment of around 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leipzig University
Leipzig University (german: Universität Leipzig), in Leipzig in Saxony, Germany, is one of the world's oldest universities and the second-oldest university (by consecutive years of existence) in Germany. The university was founded on 2 December 1409 by Frederick I, Elector of Saxony and his brother William II, Margrave of Meissen, and originally comprised the four scholastic faculties. Since its inception, the university has engaged in teaching and research for over 600 years without interruption. Famous alumni include Gottfried Wilhelm von Leibniz, Johann Wolfgang von Goethe, Leopold von Ranke, Friedrich Nietzsche, Robert Schumann, Richard Wagner, Tycho Brahe, Georgius Agricola, Angela Merkel and ten Nobel laureates associated with the university. History Founding and development until 1900 The university was modelled on the University of Prague, from which the German-speaking faculty members withdrew to Leipzig after the Jan Hus crisis and the Decree of Kutná Hora. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Vernon Hospital
Mount Vernon Hospital is located in Northwood, an area of north-west Greater London. It is one of two hospitals run by The Hillingdon Hospitals NHS Foundation Trust. History The hospital was founded as The North London Hospital for Consumption and Diseases of the Chest in a mansion in Hampstead High Street in 1860. A central London out-patients department opened in the Tottenham Court Road in 1861. In October 1880 Prince Arthur, Duke of Connaught and Strathearn laid the foundation stone for a purpose-built hospital at Mount Vernon in Hampstead. The hospital, which was built in the French Renaissance style, was completed in 1881. The adjacent Mount Vernon House served as the residence of the Hospital Seceretary and from 1903 as the hospital's Nurses' Home. Meanwhile the Central London out-patients department moved from Tottenham Court Road to Fitzroy Square in 1891. In 1901 it was decided to build a more-modern facility on part of the Northwood Park Estate in Northw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northwood, London
Northwood is an affluent area in northwest London, England. It is located within the London Borough of Hillingdon on the border with Hertfordshire and from Charing Cross. Northwood was part of the ancient parish of Ruislip, Middlesex and has formed part of Greater London since 1965. The area consists of the elevated settlement of Northwood and Northwood Hills, both of which are served by stations on the Metropolitan line of the London Underground. At the 2011 census, the population of Northwood was 10,949, down from 11,068 in 2008, while the population of Northwood Hills was 11,578, up from 10,833 in 2001. Northwood adjoins Ruislip Woods National Nature Reserve. It was also used for location filming of the Goods' and Leadbetters' houses and surrounding streets in the BBC TV sitcom '' The Good Life'' acting as Surbiton. History Toponymy Northwood was first recorded in 1435 as ''Northwode'', formed from the Old English 'north' and 'wode', meaning 'the northern wood', in re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3,4-benzpyrene
Benzo 'a''yrene (B''a''P or B ) is a polycyclic aromatic hydrocarbon and the result of incomplete combustion of organic matter at temperatures between and . The ubiquitous compound can be found in coal tar, tobacco smoke and many foods, especially grilled meats. The substance with the formula C20H12 is one of the benzopyrenes, formed by a benzene ring fused to pyrene. Its diol epoxide metabolites (more commonly known as BPDE) react with and bind to DNA, resulting in mutations and eventually cancer. It is listed as a Group 1 carcinogen by the IARC. In the 18th century a scrotal cancer of chimney sweepers, the chimney sweeps' carcinoma, was already known to be connected to soot. Description Benzo 'a''yrene (B''a''P) is a polycyclic aromatic hydrocarbon found in coal tar with the formula C20H12. The compound is one of the benzopyrenes, formed by a benzene ring fused to pyrene, and is the result of incomplete combustion at temperatures between and . Sources The main sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1876 Births
Events January–March * January 1 ** The Reichsbank opens in Berlin. ** The Bass Brewery Red Triangle becomes the world's first registered trademark symbol. * February 2 – The National League of Professional Base Ball Clubs is formed at a meeting in Chicago; it replaces the National Association of Professional Base Ball Players. Morgan Bulkeley of the Hartford Dark Blues is selected as the league's first president. * February 2 – Third Carlist War – Battle of Montejurra: The new commander General Fernando Primo de Rivera marches on the remaining Carlist stronghold at Estella, where he meets a force of about 1,600 men under General Carlos Calderón, at nearby Montejurra. After a courageous and costly defence, Calderón is forced to withdraw. * February 14 – Alexander Graham Bell applies for a patent for the telephone, as does Elisha Gray. * February 19 – Third Carlist War: Government troops under General Primo de Rivera drive through the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1947 Deaths
It was the first year of the Cold War, which would last until 1991, ending with the dissolution of the Soviet Union. Events January * January– February – Winter of 1946–47 in the United Kingdom: The worst snowfall in the country in the 20th century causes extensive disruption of travel. Given the low ratio of private vehicle ownership at the time, it is mainly remembered in terms of its effects on the railway network. * January 1 - The Canadian Citizenship Act comes into effect. * January 4 – First issue of weekly magazine ''Der Spiegel'' published in Hanover, Germany, edited by Rudolf Augstein. * January 10 – The United Nations adopts a resolution to take control of the free city of Trieste. * January 15 – Elizabeth Short, an aspiring actress nicknamed the " Black Dahlia", is found brutally murdered in a vacant lot in Los Angeles; the mysterious case is never solved. * January 16 – Vincent Auriol is inaugurated as president of France. * January 19 †... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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