Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Either of two isomeric unsaturated cyclic compounds having the formula C6H4O2, found widely in plants, especially in a yellow crystalline form, and used in making dyes, tanning hides, and photography.
- noun Any of various quinonoid compounds, often yellow to red in color, many of which have biological derivation or importance, such as coenzyme-Q.
from The Century Dictionary.
- noun The general name applied to all benzene derivatives in which two hydrogen atoms are replaced by two oxygen atoms.
- noun Specifically, a compound obtained by distilling kinic acid with diluted sulphuric acid and peroxid of manganese, or by the oxidation of aniline with chromic acid.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) A crystalline substance, C6H4O2 (called also
benzoketone ), first obtained by the oxidation of quinic acid and regarded as a double ketone; also, by extension, any one of the series of which quinone proper is the type.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry any of a class of
aromatic compounds having twocarbonyl functional groups in the same six-memberedring
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Drink tonic water the quinone is a nerve relaxant and try Naphcon A eye drops.
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There is now growing evidence that supplementation with a substance that many nutritional scientists believe is a newly discovered vitamin, pyrroloquinoline quinone, or PQQ, may also help reduce the risk of various forms of dementia, including Alzheimer's dementia.
Scott Mendelson, M.D.: Can Vitamin-like PQQ Help Reduce the Risk of Alzheimer's Dementia? M.D. Scott Mendelson 2011
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There is now growing evidence that supplementation with a substance that many nutritional scientists believe is a newly discovered vitamin, pyrroloquinoline quinone, or PQQ, may also help reduce the risk of various forms of dementia, including Alzheimer's dementia.
Scott Mendelson, M.D.: Can Vitamin-like PQQ Help Reduce the Risk of Alzheimer's Dementia? M.D. Scott Mendelson 2011
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There is now growing evidence that supplementation with a substance that many nutritional scientists believe is a newly discovered vitamin, pyrroloquinoline quinone, or PQQ, may also help reduce the risk of various forms of dementia, including Alzheimer's dementia.
Scott Mendelson, M.D.: Can Vitamin-like PQQ Help Reduce the Risk of Alzheimer's Dementia? M.D. Scott Mendelson 2011
-
There is now growing evidence that supplementation with a substance that many nutritional scientists believe is a newly discovered vitamin, pyrroloquinoline quinone, or PQQ, may also help reduce the risk of various forms of dementia, including Alzheimer's dementia.
Scott Mendelson, M.D.: Can Vitamin-like PQQ Help Reduce the Risk of Alzheimer's Dementia? M.D. Scott Mendelson 2011
-
There is now growing evidence that supplementation with a substance that many nutritional scientists believe is a newly discovered vitamin, pyrroloquinoline quinone, or PQQ, may also help reduce the risk of various forms of dementia, including Alzheimer's dementia.
Scott Mendelson, M.D.: Can Vitamin-like PQQ Help Reduce the Risk of Alzheimer's Dementia? M.D. Scott Mendelson 2011
-
There is now growing evidence that supplementation with a substance that many nutritional scientists believe is a newly discovered vitamin, pyrroloquinoline quinone, or PQQ, may also help reduce the risk of various forms of dementia, including Alzheimer's dementia.
Scott Mendelson, M.D.: Can Vitamin-like PQQ Help Reduce the Risk of Alzheimer's Dementia? M.D. Scott Mendelson 2011
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The Zeta crystallin, quinone reductase, found in some mammals is transcribed from a lens specific promoter not present in other mammals.
Vacuity of ID: Comments on Irreducible Complexity - The Panda's Thumb 2006
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He had just shown Mummy the letter he had written to Desmond Erb, apologising for correcting him when he wrote about 'the quinone structure'.
Piranha to Scurfy & Other Stories Rendell, Ruth 2000
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The figure shows how the photosynthetically active components bacteriochlorophyll (BK), bacteriopheophytin (BF), quinone
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