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Adolph Emmerling
Adolph Emmerling (13 June 1842, Freiburg im Breisgau – 17 March 1906, Baden-Baden) was a German chemist, known for his research in the field of agricultural chemistry. He studied chemistry at the University of Freiburg, receiving his doctorate in 1865. Following graduation, he spent several years as a laboratory assistant in Freiburg and Heidelberg.Nature, Volume 73 edited by Sir In 1870 he became director of the ''Landwirtschaftlichen Versuchsstation Kiel'' (Agricultural Experimental Station in ), a post he maintained until his death. In 1874 he obta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freiburg Im Breisgau
Freiburg im Breisgau or simply Freiburg is the List of cities in Baden-Württemberg by population, fourth-largest city of the German state of Baden-Württemberg after Stuttgart, Mannheim and Karlsruhe. Its built-up area has a population of about 355,000 (2021), while the greater Freiburg metropolitan area ("Einzugsgebiet") has about 660,000 (2018). Freiburg is located at the southwestern foothills of the Black Forest, on the Dreisam River, a tributary of the Elz (Rhine), Elz. It is Germany's southwestern- and southernmost city with a population exceeding 100,000. It lies in the Breisgau, one of Germany's warmest regions, in the south of the Upper Rhine Plain. Its city limits reach from the Schauinsland summit () in the Black Forest to east of the French border, while Switzerland is to the south. The city is situated in the major Baden (wine region), wine-growing region of Baden and, together with Offenburg, serves as a tourist entry-point to the scenic Black Forest. According ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iron Filings
Iron filings are very small pieces of iron that look like a powder with a dark-grey appearance. As the name suggests, iron filings can be obtained from metal working operations as the scrap material filed off larger iron and steel parts. They are very often used in science demonstrations to show the direction of a magnetic field. Since iron is a ferromagnetic material, a magnetic field induces each particle to become a tiny bar magnet. The south pole of each particle then attracts the north poles of its neighbors, and this process is repeated over a wide area to create chains of filings parallel to the direction of the magnetic field. Iron filings are used in many places, including schools, where they test the reaction of the filings to magnets. They are also used in some toys, most famously Wooly Willy, where they serve to mimic hair on a cartoon face. See also * Coherer The coherer was a primitive form of radio signal detector used in the first radio receivers during the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientists From Freiburg Im Breisgau
A scientist is a person who researches to advance knowledge in an area of the natural sciences. In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. Though Thales ( 624–545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods,Frank N. Magill''The Ancient World: Dictionary of World Biography'', Volume 1 Routledge, 2003 it was not until the 19th century that the term ''scientist'' came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. History The roles of "scientists", and their predecessors before the emergence of modern scientific disciplines, have evolved considerably over time. Scientists of different eras (and before them, natural philosophers, mathematicians, natur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1906 Deaths
Events January–February * January 12 – Persian Constitutional Revolution: A nationalistic coalition of merchants, religious leaders and intellectuals in Persia forces the shah Mozaffar ad-Din Shah Qajar to grant a constitution, and establish a national assembly, the National Consultative Assembly, Majlis. * January 16–April 7 – The Algeciras Conference convenes, to resolve the First Moroccan Crisis between French Third Republic, France and German Empire, Germany. * January 22 – The strikes a reef off Vancouver Island, Canada, killing over 100 (officially 136) in the ensuing disaster. * January 31 – The 1906 Ecuador–Colombia earthquake, Ecuador–Colombia earthquake (8.8 on the Moment magnitude scale), and associated tsunami, cause at least 500 deaths. * February 7 – is launched, sparking a Anglo-German naval arms race, naval race between Britain and Germany. * February 11 ** Pope Pius X publishes the encyclical ''Vehementer Nos'', de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1842 Births
Events January–March * January 6–January 13, 13 – First Anglo-Afghan War – Massacre of Elphinstone's army (Battle of Gandamak): British East India Company troops are destroyed by Afghan forces on the road from Kabul to Jalalabad, Afghanistan, by Wazir Akbar Khan, Akbar Khan, son of Dost Mohammad Khan (Emir of Afghanistan), Dost Mohammad Khan. * January 8 – Delft University of Technology is established by William II of the Netherlands, as a 'Royal Academy for the education of civilian engineers'. * January 23 – Antarctic explorer James Clark Ross, charting the eastern side of James Ross Island, reaches a Farthest South of 78°09'30"S. * January ** Michael Alexander (bishop), Michael Alexander takes office, as the first appointee to the Anglican-German Bishopric in Jerusalem. ** United States, American medical student William E. Clarke of Berkshire Medical College becomes the first person to administer an inhaled anesthetic, to facilitate a surgical procedure. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Albert Weber
Carl Albert Weber (13 January 1856, Spandau – 11 September 1931, Bremen) was a German botanist. He specialized in studies of original bog vegetation, the botanical composition of peat and on the developmental history of peatlands. Biography He studied under Alexander Braun at the University of Berlin and with Julius von Sachs at University of Würzburg, Würzburg. After receiving his PhD in 1879, he worked as an assistant under Anton de Bary at the University of Strasbourg. From 1884 to 1894 he was a teacher at the agricultural institute in Hohenwestedt, followed by 30 years of research as a botanist at the ''Preußische Moor-Versuchsstation'' (Prussian Moor Research Station) in Bremen. In 1909 he obtained the title of professor. In retirement he remained active in peat bog research. Selected works * ''Ueber specifische Assimilationsenergie'', 1879 (dissertation) – On specific assimilation energy. * ''Leitfaden für den Unterricht in der Physik an Ackerbauschulen u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Germany
Northern Germany (, ) is a linguistic, geographic, socio-cultural and historic region in the northern part of Germany which includes the coastal states of Schleswig-Holstein, Mecklenburg-Vorpommern and Lower Saxony and the two city-states Hamburg and Bremen. It contrasts with Southern Germany, Western Germany, and Eastern Germany. Language Northern Germany generally refers to the ''Sprachraum'' area north of the Uerdingen line, Uerdingen and Benrath line isoglosses, where Low German dialects are spoken. These comprise the West Low German, Low Saxon dialects in the west (including the Westphalian language area up to the Rhineland), the East Low German region along the Baltic Sea, Baltic coast with Western Pomerania, the Altmark and northern Brandenburg, as well as the North Low German dialects. Although from the 19th century onwards, the use of Standard German was strongly promoted especially by the Kingdom of Prussia, Prussian administration, Low German dialects are still prese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protein
Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residue (biochemistry), residues. Proteins perform a vast array of functions within organisms, including Enzyme catalysis, catalysing metabolic reactions, DNA replication, Cell signaling, responding to stimuli, providing Cytoskeleton, structure to cells and Fibrous protein, organisms, and Intracellular transport, transporting molecules from one location to another. Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the Nucleic acid sequence, nucleotide sequence of their genes, and which usually results in protein folding into a specific Protein structure, 3D structure that determines its activity. A linear chain of amino acid residues is called a polypeptide. A protein contains at least one long polypeptide. Short polypeptides, containing less than 20–30 residues, are rarely considered to be proteins and are commonly called pep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ludwig Darmstaedter
Ludwig Darmstaedter (9 August 1846 – 18 October 1927) was a German chemist and historian of science. From 1865 he studied chemistry under Robert Bunsen and Emil Erlenmeyer at the University of Heidelberg, then furthered his education in Leipzig as a student of Hermann Kolbe. Afterwards, he relocated to Berlin, where he performed studies on alkali fusion of sulfonic acids in the laboratory of Karl Hermann Wichelhaus. From 1872, with Benno Jaffé, he was involved with industrial chemical research; e.g. glycerin extraction. Later on in his career, he conducted investigations on the composition and synthesis of lanolin.Darmstaedter, Ludwig in: Neue Deutsche Biographie 3 (1957), S. 516 f. ( Georg Lockemann) His interest in the historic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Edward Thorpe
Sir Thomas Edward Thorpe CB, FRS HFRSE LLD (8 December 1845 – 23 February 1925) was a British chemist. From 1894 to 1909, he was Chief Chemist to the British Government, as Director of the Government Laboratory. Early life and education Thorpe was born at Barnes Green in Harpurhey, Manchester, the son of George Thorpe, a cotton merchant at Trafford Bank, and his wife Mary Wilde. He was educated at Hulme Grammar School. Thorpe originally worked as a clerk, but in 1863 began working as an assistant to Henry Roscoe, a professor of chemistry at Owen's College, Manchester, where he gained a degree in Chemistry. Thorpe then undertook postgraduate studies at the University of Heidelberg, gaining his doctorate (PhD). Academic career After a time working for August Kekulé in Bonn Thorpe returned to Britain in 1870 to accept a Chair at the Andersonian Institute (now the University of Strathclyde) in Glasgow. He later held posts at the Yorkshire College of Science (now the Univ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baeyer–Emmerling Indole Synthesis
Baeyer–Emmerling indole synthesis is a method for synthesizing indole from a (substituted) ''ortho''-nitrocinnamic acid and iron powder in strongly basic solution. This reaction was discovered by Adolf von Baeyer and Adolph Emmerling in 1869. Reaction mechanism The reaction of iron powder with ''o''-nitrocinnamic acid reduces the nitro group to a nitroso. The nitrogen then condenses with a carbon on the alkene chain with loss of a molecule of water to form a ring. Decarboxylation Decarboxylation is a chemical reaction that removes a carboxyl group and releases carbon dioxide (CO2). Usually, decarboxylation refers to a reaction of carboxylic acids, removing a carbon atom from a carbon chain. The reverse process, which is ... gives indole. See also * Baeyer–Drewson indigo synthesis References {{DEFAULTSORT:Baeyer-Emmerling Indole Synthesis Indole forming reactions Organic reactions Name reactions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potash
Potash ( ) includes various mined and manufactured salts that contain potassium in water- soluble form.Potash , USGS 2008 Minerals Yearbook The name derives from ''pot ash'', plant ashes or soaked in water in a pot, the primary means of manufacturing potash before the Industrial Era. The word '''' is derived from ''potash''. Potash is produced worldwide in amounts exceeding 71.9 million |
