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Trans-Diptoindonesin B
''trans''-Diptoindonesin B is an oligomeric stilbenoid. It is a resveratrol trimer. It can be isolated from ''Dryobalanops oblongifolia ''Dryobalanops oblongifolia'' is a species of plant in the family Dipterocarpaceae, native to regions of Southeast Asia and Maritime Southeast Asia. The species name is derived from Latin (' = rather long and leaf (' = leaf); and refers to the s ...''. References Resveratrol oligomers {{Aromatic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligomer
In chemistry and biochemistry, an oligomer () is a molecule that consists of a few repeating units which could be derived, actually or conceptually, from smaller molecules, monomers.Quote: ''Oligomer molecule: A molecule of intermediate relative molecular mass, the structure of which essentially comprises a small plurality of units derived, actually or conceptually, from molecules of lower relative molecular mass.'' The name is composed of Greek elements '' oligo-'', "a few" and '' -mer'', "parts". An adjective form is ''oligomeric''. The oligomer concept is contrasted to that of a polymer, which is usually understood to have a large number of units, possibly thousands or millions. However, there is no sharp distinction between these two concepts. One proposed criterion is whether the molecule's properties vary significantly with the removal of one or a few of the units. An oligomer with a specific number of units is referred to by the Greek prefix denoting that number, wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Resveratrol
Resveratrol (3,5,4′-trihydroxy-''trans''-stilbene) is a stilbenoid, a type of natural phenol, and a phytoalexin produced by several plants in response to injury or when the plant is under attack by pathogens, such as bacteria or fungi. Sources of resveratrol in food include the skin of grapes, blueberries, raspberries, mulberries, and peanuts. Although commonly used as a dietary supplement and studied in laboratory models of human diseases, there is no high-quality evidence that resveratrol improves lifespan or has a substantial effect on any human disease. Research Resveratrol has been studied for its potential therapeutic use, with little evidence of anti-disease effects or health benefits in humans. Cardiovascular disease There is no evidence of benefit from resveratrol in people who already have heart disease. A 2018 meta-analysis found no effect on systolic or diastolic blood pressure; a sub-analysis revealed a 2 mmHg decrease in systolic pressure only from res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trimer (chemistry)
In chemistry, a trimer (; ) is a molecule or polyatomic anion formed by combination or association of three molecules or ions of the same substance. In technical jargon, a trimer is a kind of oligomer derived from three identical precursors often in competition with polymerization. Examples Alkyne trimerisation In 1866, Marcellin Berthelot reported the first example of cyclotrimerization, the conversion of acetylene to benzene. This process was commercialized: : Nitrile trimerization Symmetrical 1,3,5-triazines are prepared by trimerization of certain nitriles such as cyanogen chloride or cyanimide. Cyanogen chloride and cyanogen bromide each trimerize at elevated temperatures over a carbon catalyst. The chloride gives cyanuric chloride: : The bromide has an extended shelflife when refrigerated. Like the chloride, it undergoes ab exothermic trimerisation to form cyanuric bromide. This reaction is catalyzed by traces of bromine, metal salts, acids and bases. For this reason ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dryobalanops Oblongifolia
''Dryobalanops oblongifolia'' is a species of plant in the family Dipterocarpaceae, native to regions of Southeast Asia and Maritime Southeast Asia. The species name is derived from Latin (' = rather long and leaf (' = leaf); and refers to the shape of the leaf. Description Both produce heavy hardwood timber, which is sold under the trade name of Kapur. Subspecies There are two subspecies: * ''Dryobalanops oblongifolia'' subsp. ''oblongifolia'' (synonym = ''Baillonodendron malayanum'' F.Heim) — it is endemic to the island of Borneo. It is found in at least one protected area (Kubah National Park), but is threatened elsewhere due to habitat loss. It is an emergent tree, up to 60 m tall, found in mixed dipterocarp forest on sandy clay soils. *''Dryobalanops oblongifolia'' subsp. ''occidentalis'' P.S.Ashton (synonyms = ''Dryobalanops beccariana'' Ridl. & ''Dryobalanops ovalifolia'' Burkill)) — found in Sumatra and Peninsular Malaysia Peninsular Malaysia ( ms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
