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Topic: Quinone

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	EPA - Air Toxics Website - Quinone (p-Benzoquinone)
		Acute (short-term) exposure to high levels of quinone, via inhalation in humans, results in irritation of the eyes, consisting of discoloration of the conjunctiva and cornea, and causes dermatitis from dermal exposure.
		Quinone is used as a chemical intermediate, a polymerization inhibitor, an oxidizing agent, a photographic chemical, a tanning agent, and a chemical reagent.
		Acute exposure to high levels of quinone, via inhalation in humans, is highly irritating to the eyes, resulting in discoloration of the conjunctiva and cornea, while dermal exposure causes dermatitis with skin discoloration and erythema.
	www.epa.gov /ttn/atw/hlthef/quinone.html (804 words)

	Dopamine and quinone
		The catechol of the carcinogenic synthetic estrogen hexestrol, a hydrogenated derivative of diethylstilbestrol, is metabolized to its quinone, which reacts with DNA to form depurinating adducts at the N-7 of guanine and N-3 of adenine.
		Instead, it seems to involve formation of quinone product(s) because (i) the cell death is attenuated by exposure to or induction of quinone reductase and (ii) BH4-treated cells show increased formation of protein-bound quinones, which is inhibited by thiol antioxidants.
		"X-ray snapshots of quinone cofactor biogenesis in bacterial copper amine oxidase." Nat Struct Biol 9(8): 591-6.
	lansbury.bwh.harvard.edu /dopamine_and_quinone.htm (5883 words)

	Development of light-sensitive quinone diazide compositions - Patent 4141733
		The process as claimed in claim 1 wherein said quinone diazide composition comprises a non-light-sensitive film-forming polymeric binder and a polymeric compound formed from the condensation reaction of a quinone diazide with a phenol-formaldehyde resin.
		The light-sensitive quinone diazide compositions disclosed herein can further comprise a non-light-sensitive film-forming polymer wherein the weight ratio of light-sensitive polymer to non-light sensitive polymer is in the range of about 1:1 to about 99:1.
		As the amount of quinone diazide used in a photosensitive composition is increased the described amount of non-light-sensitive polymer increases.
	www.freepatentsonline.com /4141733.html (3339 words)

	Quinone [factsheet]
		* Acute (short-term) exposure to high levels of quinone, via inhalation in humans, is highly irritating to the eyes, resulting in discoloration of the conjunctiva and cornea, while dermal exposure causes dermatitis with skin discoloration and erythema.
		* The odor threshold for quinone is 0.084 ppm.
		* Quinone is used as a chemical intermediate, a polymerization inhibitor, an oxidizing agent, a photographic chemical, a tanning agent, and a chemical reagent.
	www.weblakes.com /toxic/QUINONE.HTML (671 words)

	Vitamin - Open Encyclopedia (Site not responding. Last check: 2007-09-19)
		On April 24, 2003 a research team led by Takafumi Kato of the Japanese Institute of Physical and Chemical Research confirmed that pyrroloquinoline quinone (PQQ), a substance originally discovered in 1979, can be categorised as a vitamin in mice.
		The further apart from mammals a species is, the more diverse the organisms' requirements become.
		Pyrroloquinoline quinone (PQQ) was reported as a vitamin for mice in 2003.
	open-encyclopedia.com /Vitamin (905 words)

	Quinone Profiling of Bacterial Communities in Natural and Synthetic Sewage Activated Sludge for Enhanced Phosphate ...
		The quinone compositions of all sludges tested, as determined by HPLC, are summarized in Table 2.
		The distributions of different quinone homologs in the EBPR sludges (based on the data in Table 1) are illustrated in Fig.
		Respiratory quinones of sulphate-reducing and sulphur-reducing bacteria: a systematic investigation.
	aem.asm.org /cgi/content/full/64/3/992 (4351 words)

	INCORPORATION OF AN OXYGEN FROM WATER INTO TROGLITAZONE QUINONE BY CYTOCHROME P450 AND MYELOPEROXIDASE -- He et al. 32 ...
		TGZ quinone was separated on a C18 column and identified by mass spectrometry.
		Representative CID spectra of TGZ quinone at m/z 458 (A) and m/z 456 (B).
		The spectra of the TGZ quinone formed by MPO are identical to the representative spectra.
	dmd.aspetjournals.org /cgi/content/full/32/4/442 (2417 words)

	New hydrogen bond assisted synthesis of calixarene quinone-hydrazones (Site not responding. Last check: 2007-09-19)
		Quinone hydrazones represent a class of important chemical systems that are postulated as intermediates in various reactions.
		In the present case, when ortho carboxyl group was esterified, the resultant compound was again observed to exhibit a hypsochromic shift on addition of a base.
		These results suggest that both the ortho ester and the carboxyl groups can stabilize the quinone- hydrazone form in azo calixarenes but the same groups stabilize the azo hydroxy form in their open chain analogs.
	www.arkat-usa.org /ark/journal/2003/I03_Dev/SD-637C/637C.asp (1312 words)

	Differential Gene Expression of NAD(P)H:Quinone Oxidoreductase and NRH:Quinone Oxidoreductase in Human Hepatocellular ...
		Quinones are a class of compounds ubiquitous in nature; they are natural byproducts of plants and vegetables.
		Quinone oxidoreductases were originally felt to use NADH and NADPH as electron donors (Ernster and Navazio, 1958
		the predominant quinone oxidoreductase in liver is NQO2.
	molpharm.aspetjournals.org /cgi/content/full/61/2/320 (4308 words)

	PQQ (Site not responding. Last check: 2007-09-19)
		Pyrroloquinoline quinone (PQQ) is a redox coenzyme, which serves as a cofactor for a number of enzymes (quinoproteins) and particularly for some bacterial dehydrogenases.
		The reversibility of the quinone electrochemistry can be dramatically increased in the presence of a thin organic layer preventing the strong interactions between quinone molecules and the metal electrode surface.
		Electrochemical study of pyrroloquinoline quinone covalently immobilized as monolayer onto a cystamine modified gold electrode.
	chem.ch.huji.ac.il /~eugeniik/pqq.htm (1990 words)

	Oxidative-stress-inducible qorA encodes an NADPH-dependent quinone oxidoreductase catalysing a one-electron reduction ...
		Oxidative-stress-inducible qorA encodes an NADPH-dependent quinone oxidoreductase catalysing a one-electron reduction in Staphylococcus aureus -- Maruyama et al.
		Oxidative-stress-inducible qorA encodes an NADPH-dependent quinone oxidoreductase catalysing a one-electron reduction in Staphylococcus aureus
		One-electron reduction of quinone (arrow 1); oxidation of semiquinone radical and generation of superoxide anion (arrow 2); conversion of accumulated semiquinone radical to hydroquinone (arrow 3) and two-electron reduction of quinone (arrow 4) are shown.
	mic.sgmjournals.org /cgi/content/full/149/2/389 (4100 words)

	Human protein: Q08257 - Quinone oxidoreductase (EC ) (NADPH:quinone reductase) (Zeta- crystallin). EMBL Bioinformatic ...
		This gene encodes a taxon-specific crystallin protein which has NADPH-dependent quinone reductase activity distinct from other known quinone reductases.
		Upstream genomic sequence for Crystallin, zeta (quinone reductase)
		Quinone oxidoreductase (EC 1.6.5.5) (NADPH:quinone reductase) (Zeta- crystallin).
	harvester.embl.de /harvester/Q082/Q08257.htm (829 words)

	Functional Implications of Antiestrogen Induction of Quinone Reductase: Inhibition of Estrogen-Induced Deoxyribonucleic ...
		Roy D, Liehr JG 1988 Temporary decrease in renal quinone reductase activity induced by chronic administration of estradiol to male Syrian hamsters.
		Montano MM, Katzenellenbogen BS 1997 The quinone reductase gene: a unique estrogen receptor-regulated gene that is activated by antiestrogens.
		Raina AK, Templeton DJ, Deak JC, Perry G, Smith MA 1999 Quinone reductase (NQO1), a sensitive redox indicator, is increased in Alzheimer’s disease.
	mend.endojournals.org /cgi/content/full/17/7/1344 (5748 words)

	INCORPORATION OF AN OXYGEN FROM WATER INTO TROGLITAZONE QUINONE BY CYTOCHROME P450 AND MYELOPEROXIDASE -- He et al. 32 ...
		TGZ quinone was the major metabolite formed by
		carbonyl oxygen atom of TGZ quinone was investigated using
		mechanism by which TGZ quinone is formed by P450 and peroxidase.
	dmd.aspetjournals.org /cgi/content/abstract/32/4/442 (233 words)

	Nat' Academies Press, Biographical Memoirs V.53 (1982)
		Orientation of groups in adducts of hydrogen chloride with quinone diimides.
		Adducts of quinone monoimides and conversion of active methylene adducts to ben- zofurans.
		Addi- tion of heterocyclic active methylene compounds to p-benzo- quinone diimides.
	www.nap.edu /books/0309032873/html/1.html (3396 words)

	Pyrroloquinoline quinone -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-09-19)
		Pyrroloquinoline quinone -- Facts, Info, and Encyclopedia article
		Pyrroloquinoline quinone, originally discovered in 1979, was reported to be a (Any of a group of organic substances essential in small quantities to normal metabolism) vitamin in (Click link for more info and facts about mice) mice on April 24 2003 by a research team led by Takafumi Kato of the ().
		Because it has not been shown that any disease results from a dietary deficiency of this substance in (Any living or extinct member of the family Hominidae) humans, it is not considered a vitamin in humans.
	www.absoluteastronomy.com /encyclopedia/p/py/pyrroloquinoline_quinone.htm (96 words)

	Reactive oxygen species from NAD(P)H:quinone oxidoreductase constitutively activate NF-{kappa}B in malignant melanoma ...
		Ferricytochrome c reduction and cellular proliferation of melanoma cells are reduced by quinone analogs and NAD(P)H oxidase inhibitors.
		flavoprotein that catalyzes the two-electron reduction of quinones,
		that catalyzes the two-electron reduction of quinones to quinols,
	ajpcell.physiology.org /cgi/content/full/280/3/C659 (7447 words)

	FQR1, a Novel Primary Auxin-Response Gene, Encodes a Flavin Mononucleotide-Binding Quinone Reductase -- Laskowski et ...
		FQR1, a Novel Primary Auxin-Response Gene, Encodes a Flavin Mononucleotide-Binding Quinone Reductase -- Laskowski et al.
		FQR1 is a novel primary auxin-response gene that codes for a flavin mononucleotide-binding flavodoxin-like quinone reductase.
		indicating that FQR1 functions as a quinone reductase in vivo.
	www.plantphysiol.org /cgi/content/abstract/128/2/578 (411 words)

	Quinone - toxicity, ecologicial toxicity and regulatory information
		Quinone - Identification, toxicity, use, water pollution potential, ecological toxicity and regulatory information
		There may be other diseases and chemicals that have similar symptoms.
		Quickview Toxicity Summary for Quinone from U.S. EPA IRIS Database
	www.pesticideinfo.org /Detail_Chemical.jsp?Rec_Id=PC36877 (752 words)

	Documentation for Immediately Dangerous to Life or Health Concentrations (IDLHs)
		Human data: None relevant for use in determining the revised IDLH.
		Basis for revised IDLH: No inhalation toxicity data are available on which to base an IDLH for quinone.
		Therefore, the revised IDLH for quinone is 100 mg/m
	www.cdc.gov /niosh/idlh/106514.html (253 words)

	Single Eubacterial Origin of Eukaryotic Sulfide:Quinone Oxidoreductase, a Mitochondrial Enzyme Conserved from the Early ...
		quinone reduction, are compatible with the view that eukaryotic
		to quinones as their entry point into the mitochondrial respiratory
		reductase family of flavoproteins, and is inhibited by quinone
	mbe.oxfordjournals.org /cgi/content/full/20/9/1564 (6127 words)

	Quinone (CASRN 106-51-4), IRIS, Environmental Protection Agency
		The health effects data for quinone were reviewed by the U.S. EPA RfD/RfC Work Group and determined to be inadequate for derivation of an inhalation RfC.
		Screening-Level Literature Review Findings -- A screening-level review conducted by an EPA contractor of the more recent toxicology literature pertinent to the RfC for Quinone conducted in September 2002 did not identify any critical new studies.
		IRIS users who know of important new studies may provide that information to the IRIS Hotline at hotline.iris@epa.gov or (202)566-1676.
	www.epa.gov /IRIS/subst/0509.htm (306 words)

	Argonne Chemistry Staff
		of Quinone Anions in the Rhodobacter sphaeroides R-26 Reaction
		Quinones as Prosthetic Groups in Membrane Electron Transfer
		Interaction of the Primary Quinone with Iron in Reaction
	chemistry.anl.gov /staff/photosynthesis/tiede.html (2003 words)

	definition of quinone
		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.
		Acid, Also, And, Any, As, By, Called, Crystalline, Double, Extension, First, Is, Ketone, Obtained, Of, One, Oxidation, Proper, Quinic, Quinone, Regarded, Series, Substance, The, Type, Which
		Acid, As, Extension, First, Is, Ketone, One, Oxidation, Quinone, Series, Substance, Type, Which
	www.brainydictionary.com /words/qu/quinone209499.html (127 words)

	Quinone - compare prices, reviews and buy at NexTag - Price - Review
		Quinone - compare prices, reviews and buy at NexTag - Price - Review
		Found 56 matches for quinone in All Categories
		Wood tip - designed and crafted with input from Marc Quinones.
	www.nextag.com /serv/main/buyer/OutPDir.jsp?search=quinone (115 words)

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