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Branched-chain Dicarboxylic Acid
Branched-chain dicarboxylic acids are a class of dicarboxylic acids. Long-chain dicarboxylic acids containing vicinal dimethyl branching near the centre of the carbon chain have been discovered in the genus '' Butyrivibrio'', bacteria which participate in the digestion of cellulose in the rumen. These fatty acids, named diabolic acids, have a chain length depending on the fatty acid used in the culture medium. The most abundant diabolic acid in ''Butyrivibrio'' had a 32-carbon chain length. Diabolic acids were also detected in the core lipids of the genus '' Thermotoga'' of the order Thermotogales, bacteria living in solfatara springs, deep-sea marine hydrothermal systems and high-temperature marine and continental oil fields. It was shown that about 10% of their lipid fraction were symmetrical C30 to C34 diabolic acids. The C30 (13,14-dimethyloctacosanedioic acid) and C32 (15,16-dimethyltriacontanedioic acid) diabolic acids have been described in '' Thermotoga maritima''. Some p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dicarboxylic Acid
In organic chemistry, a dicarboxylic acid is an organic compound containing two carboxyl groups (). The general molecular formula for dicarboxylic acids can be written as , where R can be aliphatic or aromatic.Boy Cornils, Peter Lappe "Dicarboxylic Acids, Aliphatic" in Ullmann's Encyclopedia of Industrial Chemistry 2014, Wiley-VCH, Weinheim. In general, dicarboxylic acids show similar chemical behavior and reactivity to monocarboxylic acids. Dicarboxylic acids are usually colorless solids. A wide variety of dicarboxylic acids are used in industry. Adipic acid, for example, is a precursor to certain kinds of nylon. A wide variety of dicarboxylic acids are found in nature. Aspartic acid and glutamic acid are two amino acids found in all life. Succinic and fumaric acids are essential for metabolism. A large inventory of derivatives are known including many mono- and diesters, amides, etc. Partial list of saturated dicarboxylic acids Some common or illustrative examples : ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gardenia Jasminoides
''Gardenia jasminoides'', commonly known as gardenia and cape jasmine, is an evergreen flowering plant in the coffee family Rubiaceae. It is native to the subtropical and northern tropical parts of the Far East. Wild plants range from 30 centimetres to 3 metres (about 1 to 10 feet) in height. They have a rounded Habit (biology), habit with very dense branches with opposite leaves that are lanceolate-oblong, leathery or gathered in groups on the same node and by a dark green, shiny and slightly waxy surface and prominent veins. With its shiny green leaves and heavily fragrant white summer flowers, it is widely used in gardens in tropical, subtropical, and warm temperate climate, temperate climates. It also is used as a houseplant in temperate climates. It has been in cultivation in China for at least a thousand years, and it was introduced to English gardens in the mid-18th century. Many varieties have been bred for horticulture, with low-growing, and large, and long-flowering for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lignin
Lignin is a class of complex organic polymers that form key structural materials in the support tissues of most plants. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Chemically, lignins are polymers made by cross-linking phenolic precursors. History Lignin was first mentioned in 1813 by the Swiss botanist A. P. de Candolle, who described it as a fibrous, tasteless material, insoluble in water and alcohol but soluble in weak alkaline solutions, and which can be precipitated from solution using acid. He named the substance "lignine", which is derived from the Latin word '' lignum'', meaning wood. It is one of the most abundant organic polymers on Earth, exceeded only by cellulose and chitin. Lignin constitutes 30% of terrestrial non-fossil organic carbon on Earth, and 20 to 35% of the dry mass of wood. Lignin is present in red algae, which suggest that the common ancestor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Farnesyltransferase
Farnesyltransferase () is one of the three enzymes in the prenyltransferase group. Farnesyltransferase (FTase) adds a 15-carbon isoprenoid called a farnesyl group to proteins bearing a CaaX motif: a four-amino acid sequence at the carboxyl terminus of a protein. Farnesyltransferase's targets include members of the Ras superfamily of small GTP-binding proteins critical to cell cycle progression. For this reason, several FTase inhibitors are undergoing testing as anti-cancer agents. FTase inhibitors have shown efficacy as anti-parasitic agents, as well. FTase is also believed to play an important role in development of progeria and various forms of cancers. Farnesyltransferase catalyzes the chemical reaction :farnesyl diphosphate + protein-cysteine \rightleftharpoons S-farnesyl protein + diphosphate Thus, the two substrates of this enzyme are farnesyl diphosphate and protein-cysteine, whereas its two products are S-farnesyl protein and diphosphate. Overview Farnesyltra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Itaconic Acid
Itaconic acid is an organic compound with the formula . With two carboxyl groups, it is classified as a dicarboxylic acid. It is a non-toxic white solid that is soluble in water and several organic solvents. It plays several roles in biology. Reactions Upon heating, itaconic acid converts to its anhydride. As a dicarboxylic acid, itaconic acid has two pKa's. At pH levels above 7, itaconic acid exists as its double negatively charged form, termed itaconate. As an α,β-unsaturated carbonyl compound, itaconic acid is a good Michael acceptor. Thus, nucleophiles add across the C=C bond. : (R = organic group). This reaction is the means by which the fire retarding chemical 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide can be incorporated into polymers. Production In 1836, Samuel Baup discovered itaconic acid as a by-product in a dry distillation of citric acid. In the late 1920s, itaconic acid was isolated from a fungus in the ''Aspergillus'' genus of fungi The dry dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fungi
A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and mold (fungus), molds, as well as the more familiar mushrooms. These organisms are classified as one of the kingdom (biology)#Six kingdoms (1998), traditional eukaryotic kingdoms, along with Animalia, Plantae, and either Protista or Protozoa and Chromista. A characteristic that places fungi in a different kingdom from plants, bacteria, and some protists is chitin in their cell walls. Fungi, like animals, are heterotrophs; they acquire their food by absorbing dissolved molecules, typically by secreting digestive enzymes into their environment. Fungi do not photosynthesize. Growth is their means of motility, mobility, except for spores (a few of which are flagellated), which may travel through the air or water. Fungi are the principal decomposers in ecological systems. These and other differences place fungi in a single group of related o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichen
A lichen ( , ) is a hybrid colony (biology), colony of algae or cyanobacteria living symbiotically among hypha, filaments of multiple fungus species, along with yeasts and bacteria embedded in the cortex or "skin", in a mutualism (biology), mutualistic relationship.Introduction to Lichens – An Alliance between Kingdoms . University of California Museum of Paleontology. . Lichens are the lifeform that first brought the term symbiosis (as ''Symbiotismus'') into biological context. Lichens have since been recognized as important actors in nutrient cycling and producers which many higher trophic feeders feed on, such as reindeer, gastropods, nematodes, mites, and springtails. Lichens have properties different from those of their component organisms. They come in man ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Itaconic Acid
Itaconic acid is an organic compound with the formula . With two carboxyl groups, it is classified as a dicarboxylic acid. It is a non-toxic white solid that is soluble in water and several organic solvents. It plays several roles in biology. Reactions Upon heating, itaconic acid converts to its anhydride. As a dicarboxylic acid, itaconic acid has two pKa's. At pH levels above 7, itaconic acid exists as its double negatively charged form, termed itaconate. As an α,β-unsaturated carbonyl compound, itaconic acid is a good Michael acceptor. Thus, nucleophiles add across the C=C bond. : (R = organic group). This reaction is the means by which the fire retarding chemical 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide can be incorporated into polymers. Production In 1836, Samuel Baup discovered itaconic acid as a by-product in a dry distillation of citric acid. In the late 1920s, itaconic acid was isolated from a fungus in the ''Aspergillus'' genus of fungi The dry dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crocus Sativus
''Crocus sativus'', commonly known as saffron crocus or autumn crocus, is a species of flowering plant in the iris family (biology), family Iridaceae. A cormous autumn-flowering cultivated perennial plant, perennial, unknown in the wild, it is best known for the culinary use of its floral Stigma (botany), stigmas as the spice saffron. Human cultivation of saffron crocus and the trade and use of saffron have endured for more than 3,500 years and span different cultures, continents, and civilizations. Common names The plant is most commonly known as the saffron crocus. The alternative name autumn crocus is also used for species in the ''Colchicum'' genus, which are not closely related but strongly resemble the true crocuses; in particular, the superficially similar species ''Colchicum autumnale'' is sometimes even referred to as ''meadow saffron''. However, the true crocuses have three stamens and one style supporting three long stigmas, while colchicums have six stamens and three ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vicinal (chemistry)
In chemistry the descriptor vicinal (from Latin ''vicinus'' = neighbor), abbreviated ''vic'', is a descriptor that identifies two functional groups as bonded to two adjacent carbon atoms (i.e., in a 1,2-relationship). It may arise from vicinal difunctionalization. Relation of atoms in a molecule For example, the molecule 2,3-dibromobutane carries two vicinal bromine Bromine is a chemical element; it has chemical symbol, symbol Br and atomic number 35. It is a volatile red-brown liquid at room temperature that evaporates readily to form a similarly coloured vapour. Its properties are intermediate between th ... atoms and 1,3-dibromobutane does not. Mostly, the use of the term vicinal is restricted to two identical functional groups. Likewise in a ''gem-''dibromide the prefix ''gem'', an abbreviation of '' geminal'', signals that both bromine atoms are bonded to the same carbon atom (i.e., in a 1,1-relationship). For example, 1,1-dibromobutane is geminal. While comparativel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crocetin
Crocetin is a natural apocarotenoid dicarboxylic acid, a diterpenoid, and a branched-chain dicarboxylic acid. It was the first plant carotenoid to be recognized as early as 1818 while the history of saffron cultivation reaches back more than 3,000 years. The major active ingredient of saffron is the yellow pigment crocin 2 (three other derivatives with different glycosylations are known) containing a gentiobiose (disaccharide) group at each end of the molecule. It is found in the crocus flower together with its glycoside, crocin, and '' Gardenia jasminoides'' fruits. It is also known as crocetic acid. It forms brick red crystals with a melting point of 285 °C. The chemical structure of crocetin forms the central core of crocin, the compound responsible for the color of saffron. Crocetin is usually extracted commercially from gardenia fruit, due to the high cost of saffron. A simple and specific HPLC-UV method has been developed to quantify the five major biological ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
