benzoquinone

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benzoquinone

[¦ben·zō‚kwə′nōn]
(organic chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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dermestoides, such as the benzoquinone volatile compounds isolated from the defensive secretions of U.
Accumulation of HGA leads to the formation of a benzoquinone polymer catalyzed by the enzyme polyphenol oxidase.
Xun, "Reduction of benzoquinones to hydroquinones via spontaneous reaction with glutathione and enzymatic reaction by S-glutathionylhydroquinone reductases," Biochemistry, vol.
Taxon Compounds Suborder Cyphophthalmi Ketones, naphthoquinones Suborder Eupnoi Family Phalangiidae naphthoquinones Family Sclerosomatidae ketones, alcohols Suborder Dyspnoi unknown Suborder Laniatores Infraorder Insidiatores Amines, bornyl esters, terpenes, alkaloids Phenols, methylquinones Infraorder Grassatores Benzoquinones, phenols Table 2.-Compounds and percent composition identified in methanol extract of whole females of the stylocellid from Sulawesi.
When model predictions of adduct levels were plotted versus benzene exposure [greater than or equal to] 1 ppm, we observed marked downward concavity, particularly for adducts of the benzoquinones. The between-person variance component of adduct levels increased in the order 1,2-BQ < 1,4-BQ < BO, whereas the within-person variance components of the three adducts followed the reverse order.
The allergens of exotic woods are primarily benzoquinones and napthoquinones.
Abstract.--The Bombardier beetle (Brachinus sp., Metrius sp., Stenaptinus sp.) has been often studied due to its ability to synthesize and spray a hot, noxious combination of benzoquinones and oxygen.
This forces the previously segregated reactants through a one-way value in each gland into an underlying reaction chamber, where enzymes convert the chemicals into the spray's active ingredient (benzoquinones), while liberating lots of heat.
Benzoquinones are potent electrophiles and acceptors in the Micheal reaction and can readily react with thiol enzymes such as thioredoxin and glutathione in cells (Hayashi et al.
Chemically, phenols and benzoquinones predominate within laniatorid secretions, while acyclic components and, at least in Phalangium opilio Linnaeus 1758, also naphthoquinones (Wiemer et al.