Gertrude Maud Robinson
Gertrude Maud Robinson (formerly Walsh) was an influential organic chemistry, organic chemist most famous for her work on plant pigments; the Piloty-Robinson Pyrrole Synthesis, which is named for her; her syntheses of fatty acids; and her synthesis of δ-hexenolactone,Medawar, P.B.; Robinson, G.M.; Robinson, R. A Synthetic Differential Growth Inhibitor. ''Nature'', 1943, ''151'', 195. the first synthetic molecule with the character of penicillin.Dunstan, A.E.; Woodhead, D.W.; Simonsen, J.L. Obituary notices. ''J. Chem. Soc. '', 1954, 2664–2668. Biography Robinson was born on 6 February 1886 in Winsford, Cheshire and died of a heart attack on 1 March 1954. After attending The Winsford Academy, Verdin Secondary School, she was granted her B. Sc. in 1907 and M. Sc. in 1908 from Owens College. She then researched at the University of Manchester under Chaim Weizmann, who later became the first president of Israel, and taught chemistry at the Manchester High School for Girls. I ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Winsford
Winsford is a town and civil parish in the unitary authority of Cheshire West and Chester and the ceremonial county of Cheshire, England. It is on the River Weaver, south of Northwich and west of Middlewich. It grew around the salt mining industry after the river was canalised in the 18th century, allowing freight to be conveyed northwards to the Port of Runcorn on the River Mersey. At the 2021 census the built up area had a population of 32,530 and the parish had a population of 33,547. Winsford is split into three areas: Over on the western side of the River Weaver, Wharton on the eastern side, and Swanlow and Dene. History Early origins The name ''Winsford'' is of uncertain origin, but is thought to derive from a personal name Wain or Wynne and ford, referencing a crossing point of the River Weaver. The Norman Earls of Chester had a hunting lodge or summer palace at Darnhall in Over parish. There was an enclosed area where deer and wild boar were kept to be hunted by t ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Azoxy
In chemistry, azoxy compounds are a group of organic compounds sharing a common functional group with the general structure . They are considered Amine oxide, N-oxides of azo compounds. Azoxy compounds are 1,3-dipoles and 1,3-dipolar cycloaddition, cycloadd to double bonds. Most azoxy-containing compounds have aryl substituents. Preparation Azoxybenzene and its derivatives are typically prepared by Redox, reduction of Nitro compound, nitrocompounds, such as the reduction of nitrobenzene with arsenous oxide. Such reactions are proposed to proceed via the intermediacy of the nitroso compounds and hydroxylamines, e.g. phenylhydroxylamine and nitrosobenzene (Ph = phenyl, ): PhNHOH + PhNO -> PhN(O)NPh + H2O Nitrosocarbamate esters decarboxylate in strong base to an azotate susceptible to strong alkylation agents: :–N(H)CO2R + 2Nitrogen dioxide, NO2 → –N(N=O)CO2R + HNO3 :–N(N=O)CO2R + KAlkoxide, OR → –N=NO−K+ + CO2 + R2O :–N=NO−K+ + M ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Miscibility
Miscibility () is the property of two substances to mix in all proportions (that is, to fully dissolve in each other at any concentration), forming a homogeneous mixture (a solution). Such substances are said to be miscible (etymologically equivalent to the common term " mixable"). The term is most often applied to liquids but also applies to solids and gases. An example in liquids is the miscibility of water and ethanol as they mix in all proportions. By contrast, substances are said to be immiscible if the mixture does not form a solution for certain proportions. For one example, oil is not soluble in water, so these two solvents are immiscible. As another example, butanone (methyl ethyl ketone) is immiscible in water: it is soluble in water up to about 275 grams per liter, but will separate into two phases beyond that. Organic compounds In organic compounds, the weight percent of hydrocarbon chain often determines the compound's miscibility with water. For examp ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Flavonols
Flavonols are a class of flavonoids that have the 3-hydroxyflavone backbone (IUPAC name: 3-hydroxy-2-phenylchromen-4-one). Their diversity stems from the different positions of the phenolic –OH groups. They are distinct from flavanols (with "a") such as catechin, another class of flavonoids, and an unrelated group of metabolically important molecules, the flavins (with "i"), derived from the yellow B vitamin riboflavin. Flavonols are present in a wide variety of fruits and vegetables. In Western populations, estimated daily intake is in the range of 20–50 mg per day for flavonols. Individual intake varies depending on the type of diet consumed. The phenomenon of dual fluorescence (due to excited state intramolecular proton transfer or ESIPT) is induced by tautomerism of flavonols (and glucosides) and could contribute to plant UV protection and flower colour. Besides being a subclass of flavonoids, flavonols are suggested by a study of cranberry juice to play a ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Copigmentation
Copigmentation is a phenomenon where pigmentation due to anthocyanidins is reinforced by the presence of other colorless flavonoids known as cofactors or “copigments”. This occurs by the formation of a non-covalently-linked complex. Examples ;Flowers An example is the bluish purple flowers of the Japanese garden iris ('' Iris ensata''). The characteristic floral jade coloration of '' Strongylodon macrobotrys'' has been shown to be an example of copigmentation, a result of the presence of malvin (the anthocyanin) and saponarin (a flavone glucoside) in the ratio 1:9.Greenish blue flower colour of Strongylodon macrobotrys. Kosaku Takeda, Aki Fujii, Yohko Senda and Tsukasa Iwashina, Biochemical Systematics and Ecology, Volume 38, Issue 4, August 2010, Pages 630–633, ;Berries It is a phenomenon observed in the berry color of the porcelain berry (''Ampelopsis glandulosa ''Ampelopsis glandulosa'', with common names creeper, porcelain berry, Amur peppervine, and wild grape, i ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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British Science Association
The British Science Association (BSA) is a charity and learned society founded in 1831 to aid in the promotion and development of science. Until 2009 it was known as the British Association for the Advancement of Science (BA). The current Chief Executive is Hannah Russell. The BSA's mission is to get more people engaged in the field of science by coordinating, delivering, and overseeing different projects that are suited to achieve these goals. The BSA "envisions a society in which a diverse group of people can learn and apply the sciences in which they learn." and is managed by a professional staff located at their Head Office in the Wellcome Wolfson Building. The BSA offers a wide variety of activities and events that both recognise and encourage people to be involved in science. These include the British Science Festival, British Science Week, the CREST Awards, For Thought, The Ideas Fund, along with regional and local events. History Foundation The Association was founded ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Honorary Degree
An honorary degree is an academic degree for which a university (or other degree-awarding institution) has waived all of the usual requirements. It is also known by the Latin phrases ''honoris causa'' ("for the sake of the honour") or '' ad honorem '' ("to the honour"). The degree is typically a doctorate or, less commonly, a master's degree, and may be awarded to someone who has no prior connection with the academic institution or no previous postsecondary education. An example of identifying a recipient of this award is as follows: Doctorate in Business Administration (''Hon. Causa''). The degree is often conferred as a way of honouring a distinguished visitor's contributions to a specific field or to society in general. Honorary doctorates are purely titular degrees in that they confer no rights on the recipient and carry with them no formal academic qualification. As such, it is always expected that such degrees be listed in one's curriculum vitae (CV) as an award, a ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Antibiotics
An antibiotic is a type of antimicrobial substance active against bacteria. It is the most important type of antibacterial agent for fighting pathogenic bacteria, bacterial infections, and antibiotic medications are widely used in the therapy, treatment and antibiotic prophylaxis, prevention of such infections. They may either bactericide, kill or bacteriostatic agent, inhibit the growth of bacteria. A limited number of antibiotics also possess antiprotozoal activity. Antibiotics are not effective against viruses such as the ones which cause the common cold or influenza. Drugs which inhibit growth of viruses are termed antiviral drugs or antivirals. Antibiotics are also not effective against fungi. Drugs which inhibit growth of fungi are called antifungal drugs. Sometimes, the term ''antibiotic''—literally "opposing life", from the Greek language, Greek roots ἀντι ''anti'', "against" and βίος ''bios'', "life"—is broadly used to refer to any substance used against ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Leucoanthocyanidin
Leucoanthocyanidin (flavan-3,4-diols) are colorless chemical compounds related to anthocyanidins and anthocyanins. Leucoanthocyanins can be found in ''Anadenanthera peregrina'' and in several species of ''Nepenthes'' including ''Nepenthes burbidgeae, N. burbidgeae'', ''Nepenthes muluensis, N. muluensis'', ''Nepenthes rajah, N. rajah'', ''Nepenthes tentaculata, N. tentaculata'', and ''Nepenthes × alisaputrana, N. × alisaputrana''. Such compounds include: * Leucocyanidin * Leucodelphinidin * Leucofisetinidin * Leucomalvidin * Leucopelargonidin * Leucopeonidin * Leucorobinetinidin * Melacacidin * Teracacidin from ''Acacia obtusifolia'' and ''Acacia maidenii'' heartwoods Leucoanthocyanidins have been demonstrated to be intermediates in anthocyanidin biosynthesis in flowers of ''Matthiola incana''. Edgar Charles Bate-Smith, Bate-smith recommended in 1954 the use of the Forestal solvent for the isolation of leuco-anthocyanins. Metabolism Leucoanthocyanid ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Joy Harvey
Joy Dorothy Harvey (born 1934) is an American historian of science. Life Harvey gained a PhD from Harvard University in 1983. She has been an associate editor of the Darwin Correspondence Project, and written a biography of Clémence Royer, Darwin's first French translator. She and Marilyn Bailey Ogilvie collaborated on the multi-volume ''Biographical Dictionary of Women in Science''. Pnina G. Abir-AmThe Making of a Historian of Women in Science: Marilyn Bailey Ogilvie at 80! ''History of Science Society Newsletter'', January 2018. Works * 'Medicine and politics: Dr. Mary Putnam Jacobi and the Paris Commune', ''Dialectical anthropology'', Vol. 15 (1990), p. 107–117 l'autre côté du miroir (The Other Side of the Mirror): French Neurophysiology and English Interpretations in Claude Debru, Jean Gayon and Jean-Francois Picard, eds., ''Les sciences biologiques et médicales en France, 1920-1950'', 1994. * 'Charles Darwins "Selective strategies": die französische versus die engl ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Marilyn Ogilvie
Marilyn Bailey Ogilvie (born March 22, 1936) is an American historian of science known especially for her work on the history of women in science. She taught at Oklahoma Baptist University before becoming curator of the History of Science Collections and professor at the University of Oklahoma. She is currently Curator Emeritus, History of Science Collections and Professor Emeritus, Department of the History of Science at the university. Biography Dr. Ogilvie earned an A.B. degree in Biology from Baker University (1957), an M.A. in Zoology from the University of Kansas (1959), plus a Ph.D. in the History of Science (1973) and an M.A. in Library Science (1983) from the University of Oklahoma. After working as an associate professor and division chair at Oklahoma Baptist University from 1979 to 1991, Dr. Ogilvie returned to the University of Oklahoma as the Curator of the History of Science Collections. As curator, she expanded the holdings of the collection from 79,000 to 94,00 ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Anthocyanin
Anthocyanins (), also called anthocyans, are solubility, water-soluble vacuole, vacuolar pigments that, depending on their pH, may appear red, purple, blue, or black. In 1835, the German pharmacist Ludwig Clamor Marquart named a chemical compound that gives flowers a blue color, Anthokyan, in his treatise "''Die Farben der Blüthen''" (English: The Colors of Flowers). Food plants rich in anthocyanins include the blueberry, raspberry, black rice, and black soybean, among many others that are red, blue, purple, or black. Some of the colors of autumn leaves are derived from anthocyanins. Anthocyanins belong to a parent class of molecules called flavonoids synthesized via the phenylpropanoid pathway. They can occur in all biological tissue, tissues of higher plants, including leaf, leaves, plant stem, stems, roots, flowers, and fruits. Anthocyanins are derived from anthocyanidins by adding sugars. They are odorless and moderately astringent. Although approved as food and beverage c ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |