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quinone |
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quinoneAny member of a class of cyclic organic compounds comprising a six-membered unsaturated ring (see saturation) to which two oxygen atoms are bonded as carbonyl groups (−C=O; see functional group). This structure plays an important role in theories of chemical structure and colour, since quinones occur as pigments in bacteria, fungi, and certain higher plants; animals containing quinones obtain them from plants they eat. The K vitamins (see vitamin K) are naphthoquinones. The term quinone often specifically denotes para-benzoquinone (C6H4O2), a bright yellow solid with a sharp odour used in manufacturing dyes and fungicides and in photography. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Because *OH formation may be driven by an array of PM characteristics or constituents such as surface area, size, transition metal, polycyclic aromatic hydrocarbons, or quinone content (Knaapen et al. These complexes are chemisorbed oxygen groups in the form of carboxy, quinone, lactone and phenolic groups (ref. Even though the study looked at levels of carbon monoxide and ozone, the two pollutants may simply be ``markers'' for other pollutants the women were breathing, such as benzene and quinone, which attach themselves to ultrafine particles of carbon found in auto exhaust. |
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