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Linoleic Acid
Linoleic acid (LA) is an organic compound with the formula . Both alkene groups () are ''cis''. It is a fatty acid sometimes denoted 18:2 (n−6) or 18:2 ''cis''-9,12. A linoleate is a salt or ester of this acid. Linoleic acid is a polyunsaturated, omega−6 fatty acid. It is a colorless liquid that is virtually insoluble in water but soluble in many organic solvents. It typically occurs in nature as a triglyceride (ester of glycerin) rather than as a free fatty acid. It is one of two essential fatty acids for humans, who must obtain it through their diet, and the most essential, because the body uses it as a base to make the others. The word "linoleic" derives , reflecting the fact that it was first isolated from linseed oil. History In 1844, F. Sacc, working at the laboratory of Justus von Liebig Justus ''Freiherr'' von Liebig (12 May 1803 – 18 April 1873) was a Germans, German scientist who made major contributions to the theory, practice, and pedagogy of che ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linoleic Acid Metabolism
Linoleic acid (LA) is an organic compound with the formula . Both alkene groups () are cis-trans isomerism, ''cis''. It is a fatty acid sometimes denoted 18:2 (n−6) or 18:2 ''cis''-9,12. A linoleate is a salt (chemistry), salt or ester of this acid. Linoleic acid is a polyunsaturated fatty acid, polyunsaturated, omega-6 fatty acid, omega−6 fatty acid. It is a colorless liquid that is virtually insoluble in water but soluble in many organic solvents. It typically occurs in nature as a triglyceride (ester of glycerol, glycerin) rather than as a free fatty acid. It is one of two essential fatty acids for humans, who must obtain it through their diet, and the most essential, because the body uses it as a base to make the others. The word "linoleic" derives , reflecting the fact that it was first isolated from linseed oil. History In 1844, Fritz Sacc, F. Sacc, working at the laboratory of Justus von Liebig, isolated linoleic acid from linseed oil. In 1886, Karl Peters (chemist) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fatty Acid
In chemistry, in particular in biochemistry, a fatty acid is a carboxylic acid with an aliphatic chain, which is either saturated and unsaturated compounds#Organic chemistry, saturated or unsaturated. Most naturally occurring fatty acids have an Branched chain fatty acids, unbranched chain of an even number of carbon atoms, from 4 to 28. Fatty acids are a major component of the lipids (up to 70% by weight) in some species such as microalgae but in some other organisms are not found in their standalone form, but instead exist as three main classes of esters: triglycerides, phospholipids, and cholesteryl esters. In any of these forms, fatty acids are both important diet (nutrition), dietary sources of fuel for animals and important structural components for cell (biology), cells. History The concept of fatty acid (''acide gras'') was introduced in 1813 by Michel Eugène Chevreul, though he initially used some variant terms: ''graisse acide'' and ''acide huileux'' ("acid fat" and "oi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flax
Flax, also known as common flax or linseed, is a flowering plant, ''Linum usitatissimum'', in the family Linaceae. It is cultivated as a food and fiber crop in regions of the world with temperate climates. In 2022, France produced 75% of the world's supply of flax. Textiles made from flax are known in English as linen and are traditionally used for bed sheets, underclothes, and table linen. Its oil is known as linseed oil. In addition to referring to the plant, the word "flax" may refer to the unspun fibers of the flax plant. The plant species is known only as a cultivated plant and appears to have been domesticated just once from the wild species '' Linum bienne'', called pale flax. The plants called "flax" in New Zealand are, by contrast, members of the genus '' Phormium''. Description Several other species in the genus ''Linum'' are similar in appearance to ''L. usitatissimum'', cultivated flax, including some that have similar blue flowers, and others with wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Double Bond
In chemistry, a double bond is a covalent bond between two atoms involving four bonding electrons as opposed to two in a single bond. Double bonds occur most commonly between two carbon atoms, for example in alkenes. Many double bonds exist between two different elements: for example, in a carbonyl group between a carbon atom and an oxygen atom. Other common double bonds are found in azo compounds (N=N), imines (C=N), and sulfoxides (S=O). In a skeletal formula, a double bond is drawn as two parallel lines (=) between the two connected atoms; typographically, the equals sign is used for this. Double bonds were introduced in chemical notation by Russian chemist Alexander Butlerov. Double bonds involving carbon are stronger and shorter than single bonds. The bond order is two. Double bonds are also electron-rich, which makes them potentially more reactive in the presence of a strong electron acceptor (as in addition reactions of the halogens). File:Ethene structural.svg, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxygen
Oxygen is a chemical element; it has chemical symbol, symbol O and atomic number 8. It is a member of the chalcogen group (periodic table), group in the periodic table, a highly reactivity (chemistry), reactive nonmetal (chemistry), nonmetal, and a potent oxidizing agent that readily forms oxides with most elements as well as with other chemical compound, compounds. Oxygen is abundance of elements in Earth's crust, the most abundant element in Earth's crust, making up almost half of the Earth's crust in the form of various oxides such as water, carbon dioxide, iron oxides and silicates.Atkins, P.; Jones, L.; Laverman, L. (2016).''Chemical Principles'', 7th edition. Freeman. It is abundance of chemical elements, the third-most abundant element in the universe after hydrogen and helium. At standard temperature and pressure, two oxygen atoms will chemical bond, bind covalent bond, covalently to form dioxygen, a colorless and odorless diatomic gas with the chemical formula ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrogen
Hydrogen is a chemical element; it has chemical symbol, symbol H and atomic number 1. It is the lightest and abundance of the chemical elements, most abundant chemical element in the universe, constituting about 75% of all baryon, normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the chemical formula, formula , called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply hydrogen. Dihydrogen is colorless, odorless, non-toxic, and highly combustible. Stars, including the Sun, mainly consist of hydrogen in a plasma state, while on Earth, hydrogen is found as the gas (dihydrogen) and in molecular forms, such as in water and organic compounds. The most common isotope of hydrogen (H) consists of one proton, one electron, and no neutrons. Hydrogen gas was first produced artificially in the 17th century by the reaction of acids with metals. Henry Cavendish, in 1766–1781, identified hydrogen gas as a distinct substance and discovere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon
Carbon () is a chemical element; it has chemical symbol, symbol C and atomic number 6. It is nonmetallic and tetravalence, tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiting 4 electrons. It belongs to group 14 of the periodic table. Carbon makes up about 0.025 percent of Earth's crust. Three Isotopes of carbon, isotopes occur naturally, carbon-12, C and carbon-13, C being stable, while carbon-14, C is a radionuclide, decaying with a half-life of 5,700 years. Carbon is one of the timeline of chemical element discoveries#Pre-modern and early modern discoveries, few elements known since antiquity. Carbon is the 15th abundance of elements in Earth's crust, most abundant element in the Earth's crust, and the abundance of the chemical elements, fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Carbon's abundance, its unique diversity of organic compounds, and its unusual abi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franz Sondheimer
Franz Sondheimer FRS (17 May 1926 – 11 February 1981) was a German-born British professor of chemistry. In 1960, he was awarded the Israel Prize for his contributions to science. Biography Franz Sondheimer was born in Stuttgart on 17 May 1926, the second son of Max and Ida Sondheimer. His father ran the family glue manufacturing business. His elder brother, Ernst, was Professor of Mathematics at Westfield College. Having business connections in England, Max Sondheimer managed to get his family to London in September 1937. Sondheimer, knowing no English, began his schooling in England first at Southend and then at Hailey School in Bournemouth. In 1940, having passed Common Entrance, he attended the part of Highgate School remaining in London, where he obtained School Certificate in nine subjects in 1942. A little over a year later he gained entrance to Imperial College, where he studied until the end of the war, coming top of his year in the final examination. He was awarded a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ralph Raphael
Ralph Alexander Raphael (1 January 1921 – 27 April 1998) was a British organic chemist, well known for his use of acteylene derivatives in the synthesis of natural products with biological activity. Early life and education Ralph Raphael was born in Croydon, London on New Year's Day 1921, the son of master tailor Jacob ("Jack") Raphael (1889-1978) and his wife, Lily (née Woolf; 1892-1956). He attended secondary school at Wesley College, Dublin and then Tottenham County School, where a chemistry master, Edgar Ware, introduced him to the subject that would become Raphael's lifetime passion. In 1939 he won scholarships to study at Imperial College, graduating BSc with a first-class degree in 1941 and winning the Hofmann Prize for practical chemistry. During the Second World War both the undergraduate and PhD courses at Imperial College were of two year's duration and Raphael completed the latter in 1943. His doctoral work, aimed at the synthesis of vitamin A, was published i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Percy Hilditch
Thomas Percy Hilditch (22 April 1886 – 9 August 1965) was an English chemist who researched organic synthesis, lipid chemistry, and catalytic production techniques. He served as a professor of industrial chemistry at the University of Liverpool. Hilditch was born in North Islington to Thomas and Priscilla née Hall. He was educated at Owen's School where he was influenced in science by his teachers F.R. Guglielmo and A.E. Dunstan. He joined University College, London to study chemistry under William Ramsay and J. Norman Collie graduating in 1907. He then worked at the University of Jena in 1908–1909 with Ludwig Knorr and University of Geneva 1910–1911 with P.A. Guye before returning to London to complete studies. He received a D.Sc. in 1911. Hilditch was involved in industrial research with Joseph Crosfield and Sons to produce acetone during World War I. In 1925 he joined the University of Liverpool as a professor of Industrial Chemistry. He was elected Fellow of the Royal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George O
George Ortuzar (born August 14, 1961), also known as George O, is a Cuban American actor, comedian, television host and sports agent, who is best known for his work on Univision, including hosting the shows ''Lente Loco'', ''La Piñata Loca'', and ''Giorgiomania''. Ortuzar has also appeared in several films and commercials, and was featured in advertisements promoting the Hollywood Park Racetrack, for which he served as the marketing manager during its last 12 years of operation. Since 2015, he has hosted the online sports show ''Better Sports News'' on YouTube. Career Television Ortuzar's career on television began in 1991, when he joined Univision after being discovered by production executives. After numerous appearances on ''Sabado Gigante'', he went on to become the host of ''Lente Loco'' in 1993, alongside Odalys Garcia. Years later, he starred in two children shows ''La Piñata Loca'' and ''Giorgiomania'', and has been featured in numerous commercials and infomercials over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karl Peters (chemist)
Carl Peters (27 September 1856 – 10 September 1918) was a German explorer and colonial administrator. He was a major promoter of the establishment of the German colony of East Africa (part of today’s Tanzania) and one of the founders of the German East Africa Company. He was a controversial figure in Germany for his views and his brutal treatment of native Africans, which ultimately led to his dismissal from government service in 1897. Early life Peters was born on 27 September 1856 at Neuhaus an der Elbe in the Kingdom of Hanover, the son of a Lutheran clergyman. Peters studied history and philosophy at the universities of Göttingen and Tübingen, and at the Humboldt University of Berlin as a student of Heinrich von Treitschke. In 1879, he was awarded a gold medal by the Frederick William University for his dissertation concerning the 1177 Treaty of Venice and habilitated with a treatise concerning Arthur Schopenhauer. Career German East Africa Company After hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
