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Topic: Dibenzofuran

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Benzofuran

Furan

Tetrahydrofuran

	Dibenzofuran Exposure: Overview Lawsuit Information - Find Trial Lawyers and Attorneys with Experience in Dibenzofuran ...
		Dibenzofuran is released to the air from combustion sources.
		The general public may be exposed to dibenzofuran through the inhalation of contaminated air or through the consumption of contaminated drinking water or food.
		Dibenzofuran is listed as a pollutant of concern due to its persistence in the environment, potential to bioaccumulate, and toxicity to humans and the environment.
	www.injuryboard.com /view.cfm/Topic=186 (304 words)

	Cometabolic Degradation of Dibenzofuran by Biphenyl-Cultivated Ralstonia sp. Strain SBUG 290 -- Becher et al. 66 (10): ... (Site not responding. Last check: 2007-10-13)
		Cometabolic Degradation of Dibenzofuran by Biphenyl-Cultivated Ralstonia sp.
		Regio- and stereospecific oxidation of fluorene, dibenzofuran, and dibenzothiophene by naphthalene dioxygenase from Pseudomonas sp.
		Oxidation of dibenzofuran by Pseudomonas strains harbouring plasmids of naphthalene degradation.
	intl-aem.asm.org /cgi/content/full/66/10/4528 (1927 words)

	Dibenzofuran - Wikipedia, the free encyclopedia
		Dibenzofurans can also refer to a family of organic compounds which have atom or group substitutions made for the hydrogens on any of the numbered carbon atoms in the dibenzofuran structure.
		Dibenzofurans are very toxic chemicals with properties and chemical structures similar to dioxins.
		The dibenzofuran TCDF (2,3,7,8-tetrachlorodibenzofuran) is the dibenzofuran analog of the dibenzodioxin and Seveso poison TCDD (3,4,8,9-tetrachlorodibenzodioxin).
	en.wikipedia.org /wiki/Dibenzofuran (193 words)

	Patent 4362883: Preparation of dibenzofuran (Site not responding. Last check: 2007-10-13)
		Dibenzofuran is prepared by reacting diphenyl ether in an oxygen-containing atmosphere in the presence of a palladium carboxylate catalyst, a carboxlyic acid and a copper carboxylate promoter or co-catalyst.
		Dibenzofuran, also known as diphenylene oxide, and its derivatives are useful intermediates for the preparation of dyestuffs, stabilizers for organic materials, and other useful chemical products.
		4,042,603 describes the preparation of substituted dibenzofurans from substituted diphenyl ethers or benzophenones by an oxidative coupling reaction in the presence of a carboxylate salt of palladium or a palladium organic complex and in the presence of a fatty acid ester solvent.
	www.freepatentsonline.com /4362883.html (2080 words)

	RMP Reports: Contaminant Concentrations in Fish from San Francisco Bay, 1997
		The sources of dibenzodioxins and dibenzofurans in the Bay Area are mobile sources (cars, trucks, etc.), residential wood combustion, historically deposited residues in the environment, sewage treatment plants, and industrial discharges (Gervason and Tang, 1998).
		Dibenzodioxins and dibenzofurans were measured in six samples of white croaker, each sample consisting of a composite of five white croaker fillets with skin.
		Dibenzodioxins and dibenzofurans were measured in six samples of white croaker and one sample of striped bass.
	www.sfei.org /rmp/reports/fish_contamination/fish_contamination.html (12525 words)

	Dibenzofuran - Result for Dibenzofuran - Meaning of Dibenzofuran - Definition of Dibenzofuran - Dictionary of Meaning - ...
		Image:Dibenzofuran.png framerightChemical structure of dibenzofuran showing numbering of the atoms in the rings '''Dibenzofuran''' is a heterocyclic organic compound with the chemical structure shown at right.
		Dibenzofurans are very toxic chemicals with properties and chemical structures similar to dioxin s.
		Image:TCDF_chemical_structure.png frameleftChemical structure of TCDF (2,3,7,8-tetrachlorodibenzofuran) The dibenzofuran TCDF (2,3,7,8-tetrachlorodibenzofuran) is the dibenzofuran analog of the dibenzodioxin and Seveso poison TCDD (3,4,8,9-tetrachlorodibenzodioxin).
	www.mauspfeil.net /Dibenzofuran.html (243 words)

	Spectrum Laboratories : Chemical Fact Sheet - Cas # 132649
		Dibenzofuran is released to the environment in atmospheric emissions involved with the
		dibenzofuran is biodegraded readily by adapted microbes from subsurface regions in the presence
		Biological screening studies have demonstrated that dibenzofuran is biodegraded readily by
	www.speclab.com /compound/c132649.htm (723 words)

	Dibenzofuran \| Technology Transfer Network Air Toxics Web site \| US EPA
		Dibenzofuran is released to the ambient air from combustion sources.
		Dibenzofuran has been listed as a pollutant of concern to EPA's Great Waters Program due to its persistence in the environment, potential to bioaccumulate, and toxicity to humans and the environment.
		Dibenzofuran is a polynuclear aromatic compound with a molecular weight of 168.20 g/mol.
	www.epa.gov /ttn/atw/hlthef/di-furan.html (538 words)

	766.3 Definitions. (Site not responding. Last check: 2007-10-13)
		Dibenzofuran means any of a family of compounds which has as a nucleus a triple-ring structure consisting of two benzene rings connected through a pair of bridges between the benzene rings.
		Polychlorinated dibenzofuran means any member of a class of dibenzofurans with two to eight chlorine substituents.
		Polyhalogenated dibenzofuran or PHDF means any member of a class of dibenzofurans containing two to eight chlorine, bromine, or a combination of chlorine and bromine substituents.
	www.cleanerworld.com /40CFR/P766_005.HTM (526 words)

	Dibenzofuran Degradation Pathway
		Dibenzofuran and its chlorinated derivatives, some of the simplest representatives of this class of compounds, are industrially produced as intermediates and by-products of a multitude of different processes, only some of which include coal combustion and gasification, petroleum combustion, the manufacture of pesticides, and the bleaching of pulp at paper mills.
		The first transformation in dibenzofuran degradation is effected by a three-component class IIA dioxygenase system, dibenzofuran 4,4a-dioxygenase, which attacks in angular position (acting upon a pair of carbons, one of which is involved in the bridge between two rings).
		It has been postulated (Armengaud and Timmis, 1997) that this may be due to the common expression of two separate pathways for dibenzofuran and biphenyl, the latter of which is also a growth source for some dibenzofuran-degrading microorganisms.
	umbbd.msi.umn.edu /dbf/dbf_map.html (281 words)

	Dibenzofuran Degradation Pathway (Site not responding. Last check: 2007-10-13)
		Dibenzofuran and its chlorinated derivatives, some of the simplest representatives of this class of compounds, are industrially produced as intermediates and by-products of a multitude of different processes, only some of which include coal combustion and gasification, petroleum combustion, the manufacture of pesticides, and the bleaching of pulp at paper mills.
		The first transformation in dibenzofuran degradation is effected by a three-component class IIA dioxygenase system, dibenzofuran 4,4a-dioxygenase, which attacks in angular position (acting upon a pair of carbons, one of which is involved in the bridge between two rings).
		It has been postulated ( Armengaud and Timmis, 1997) that this may be due to the common expression of two separate pathways for dibenzofuran and biphenyl, the latter of which is also a growth source for some dibenzofuran-degrading microorganisms.
	www.labmed.umn.edu /dbf/dbf_map.html (303 words)

	Dibenzofuran [factsheet]
		* Dibenzofuran is released to the ambient air from combustion sources.
		The general public may be exposed to dibenzofuran through the inhalation of contaminated air or through the consumption of contaminated drinking water or food.
		Note: There are very few health numbers or regulatory/advisory numbers for dibenzofuran; thus, a graph has not been prepared for this compound.
	www.lakes-environmental.com /toxic/DIBENZOFURAN.HTML (422 words)

	Research and Reviews: Dairy, Special Circular 169-99, Contamination and Implications of Dioxins and Furans in Cattle: A ...
		Polychlorinated dibenzo- p -dioxins (PCDD) and polychlorinated dibenzofurans (PCDF) are two related families of organochlorine compounds that are often referred to collectively as dioxins or furans.
		The chemical structure of a polychlorinated dibenzofuran where chlorine can be located at any or all of the numbered positions.
		Partitioning of 2,3,7,8-chlorinated dibenzo-p-dioxins and dibenzofurans between adipose tissue and plasma lipid of 20 Massachusetts Vietnam veterans.
	ohioline.osu.edu /sc169/sc169_7.html (3360 words)

	Patent 4769387: Dibenzofuran lipoxygenase inhibiting compounds, compositions and use
		The solution was stirred for 15 min, then dibenzofuran (16.8 g, 100 mmole) was added slowly and the reaction turned deep yellow-green.
		The desired material is prepared according to the method of example 2, except using dibenzothiophene instead of dibenzofuran.
		Variations and changes which are obvious to one skilled in the art are intended to be within the scope and nature of the invention which are defined in the appended claims.
	www.freepatentsonline.com /4769387.html (4057 words)

	Desorption, Persistence, and Leaching of Dibenzofuran in European Soils -- Celis et al. 70 (4): 1310 -- Soil Science ...
		Desorption, Persistence, and Leaching of Dibenzofuran in European Soils -- Celis et al.
		of dibenzofuran by the soils studied, although sorption was
		The half-life of dibenzofuran in the soils during
	soil.scijournals.org /cgi/content/abstract/70/4/1310 (307 words)

	Re: What is triclosan and what does it do?
		The toxicity of dioxins and dibenzofurans varies with the position and number of chlorine atoms attached to the aromatic rings.
		Those dioxins and dibenzofurans that have chlorine atoms at the 2,3 and 7 positions are particularly toxic.
		Tetrachlorodibenzo-p-dioxin and tetrachlorodibenzo- furan, which have chlorine atoms at the 2,3,7, and 8 positions, are considered the most toxic of the dioxins and dibenzofurans (4), with 2,3,7,8-tetrachlorodibenzo-p-dioxin referred to as one of the most toxic substances known.
	www.madsci.org /posts/archives/jan2000/948068271.Mi.r.html (998 words)

	UWM Marine & Freshwater Biomedical Sciences Center
		Hornung, MW, Zabel, EW and Peterson, RE: Toxic equivalency factors of polychlorinated dibenzo-p-dioxin, dibenzofuran, biphenyl and polyhalogenated diphenyl ether congeners based on rainbow trout early life stage mortality.
		Hornung, MW, Zabel, EW and Peterson, RE: Additive interactions between pairs of polybrominated dibenzo-p-dioxin, dibenzofuran and biphenyl congeners in a rainbow trout early life stage mortality bioassay.
		Walker, MK and Peterson, RE: Toxicity of polychlorinated dibenzo-o-dioxins, dibenzofurans, and biphenyls during early development in fish.
	www.uwm.edu /Dept/MFB/publications.html (6949 words)

	Science News Online (5/17/97): Those Old Dioxin Blues
		Toxic equivalency factors of polybrominated dibenzo-p-dioxin, dibenzofuran, biphenyl and polyhalogenated diphenyl ether congeners based on rainbow trout early life stage mortality.
		Potency of a complex mixture of polychlorinated dibenzo-p-dioxin, dibenzofuran, and biphenyl ocngeners compared to 2,3,7,8-tetrachlorodibenzo-p-dioxin in causing fish early life stage mortality.
		Additive interactions between pairs of polybrominated dibenzo-p-dioxin, dibenzofuran, and biphenyl congeners in a rainbow trout early life stage mortality bioassay.
	www.sciencenews.org /pages/sn_arc97/5_17_97/bob1.htm (1772 words)

	Love Canal Emergency Declaration Area: Decision on Habitability - September 1988
		In an effort to characterize the source of this contamination, dioxin and dibenzofuran congeners in the surface sample where dioxin was found at high levels were also quantified by the DOH laboratories (Table 1).
		However, the other congeners are also toxic, and methods have been developed on the basis of toxicological experiments with animals to combine the concentrations of all dibenzodioxin and dibenzofuran congeners in a toxicity-equivalent manner.
		The dioxin and dibenzofuran congeners present at this location suggest that the dioxin is from trichlorophenol wastes, a type of waste known to have been disposed at the Love Canal, rather than some other source such as fly ash.
	www.health.state.ny.us /nysdoh/lcanal/lceda.htm (8759 words)

	United States Patent Application: 0020002978
		A filter for removing a low molecular weight organic compound from air comprising: a polyurethane foam pretreated by using an organic extraction to extract contaminants originally contained in the polyurethane foam so as to form a plurality of binding sites for binding the low molecular weight organic compound.
		As shown in table 1, the PUF filter of the present invention is significantly better than regular cigarette filters in removing toxic polynuclear aromatics such as 2-methyinaphthalene, acenaphthylene, acenaphthene, dibenzofuran, fluorene, phenanthrene, anthracene, carbazole, fluoranthene, pyrene, benzo(a)anthracene and chrysene.
		This is demonstrated from comparing the weight of polynuclear aromatic compounds found in the impinger when a conventional filter was used to those found when the PUF filter was used.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/PTO/search-bool.html&r=1&f=G&l=50&co1=AND&d=PG01&s1=20020002978.PGNR.&OS=DN/20020002978&RS=DN/20020002978 (4451 words)

	Polybrominated dibenzo-p-dioxins and dibenzofurans (EHC 205, 1998)
		The purpose of the IOMC is to promote coordination of the policies and activities pursued by the Participating Organizations, jointly or separately, to achieve the sound management of chemicals in relation to human health and the environment.
		Generally, the concentrations of dibenzofurans exceeded those of dibenzo- p -dioxins, and there was a dominance of lower substituted homologues (mono to tri).
		Dust from an underground garage contained lower halogenated PBDFs (mono and di) and PXDFs (di to tetra), with a maximum concentration of 4.3 µg/kg for mixed dihalogenated dibenzofurans (DiXDFs).
	www.inchem.org /documents/ehc/ehc/ehc205.htm (12061 words)

	DHEA, antibiotics, Weight Loss drugs, weight loss herbs, weight loss herbal formula, hair loss, hair growth, buy Rx ... (Site not responding. Last check: 2007-10-13)
		Moreover, this cytochrome complex was shown to be equally catalytically active with respect to rates and reactivity with different sulfur substrates in the reconstituted sulfur-oxidizing enzyme system using homogeneous Sox-proteins of P. pantotrophus.
		The genes responsible for angular dioxygenation of dibenzofuran in actinomycetes were cloned by using a degenerate set of PCR primers designed by using conserved sequences of the dioxygenase alpha subunit genes.
		We confirmed that transcription of the dfdA1 gene was induced by dibenzofuran in Terrabacter sp.
	www.twinpharm.com /ref-plasmid/plasmid-research-abs4.544.html (1358 words)

	Dioxins and Furans - Sources, Fingerprints, Patterns, and Homologue Profiles (Site not responding. Last check: 2007-10-13)
		Especially higher levels of octa- and hepta-chlorinated furans were generated in the pyrolysis experiments, whereas lower chlorinated furans were produced predominantly by combustion.
		The primary distinction between theories (2) and (3) is that theory (2) requires the presence of precursor compounds in the feed material whereas theory (3) begins with the combustion of diverse substances that are not defined as precursors, which eventually react to form precursors and eventually, dioxin-like molecules.
		The objective of the present study was to determine whether the levels and congener patterns of PCDDs and PCDFs in the blood of workers involved in the production of such substances could be related to their occupational environment.
	hometown.aol.com /Kaltofen/dioxin.html (3267 words)

	Summary for GO Term: dibenzofuran metabolism (GO:0018893) (Site not responding. Last check: 2007-10-13)
		The chemical reactions involving dibenzofuran, a substance composed of two benzene rings linked by one ether bond and one carbon-carbon bond.
		Dibenzofuran is a white crystalline solid created from the production of coal tar and used as an insecticide and an intermediate in the production of other chemicals.
		More information about this term can be found at the GO browser of Gene Ontology Database.
	acorn.cshl.edu /db/ontology/search_term?id=GO:0018893 (152 words)

	Water Science and Technology 36:10 (1997) 9-16 - Kano Kasuga et al. - Genes of enzymes involved in the biodegradation ...
		Genes of enzymes involved in the biodegradation of carbazole, dibenzofuran, fluorene, and dibenzo-p-dioxin by bacteria
		A bacterial strain DBF63, which can grow on either dibenzofuran (DBF) or fluorene (FN) as the sole source of carbon and energy, was also isolated from soil in Japan.
		The metabolic intermediates were detected in the culture broth of strain DBF63 grown on DBF or FN, and the degradation pathways of DBF and FN in strain DBF63 were proposed: DBF was subjected to initial oxygenation, meta -cleavage and hydrolysis into salicylate, and further metabolized.
	www.iwaponline.com /wst/03610/wst036100009.htm (380 words)

	Haptens, tracers, immunogens and antibodies for carbazole and dibenzofuran derivatives - US Patent 5464746 (Site not responding. Last check: 2007-10-13)
		Haptens, tracers, immunogens and antibodies for carbazole and dibenzofuran derivatives
		The present invention relates to novel carbazole and dibenzofuran hapten compounds, to tethered intermediates, to immunogens useful for preparing antibodies, to tracer compounds useful for assaying the haptens, to oligonucleotides labeled with the haptens and to kits containing these reagents.
		Haptens which are structurally similar to carbazole or dibenzofuran have the following general structure: ##STR6## wherein G is O (dibenzofuran) or NR (carbazole), a, a', and A are as defined above.
	www.patentstorm.us /patents/5464746.html (11107 words)

	Liver Cancer Research and PCBs
		The U.S. EPA (1986c) noted that the biological activity of various chlorinated dibenzofurans varies greatly, so that risk assessment by analogy to any of these more widely studied compounds would not be recommended.
		Dibenzofuran should be classified as an EPA Group D (U.S. EPA, 1986b) or an IARC Group 3 chemical.
		Aryl hydrocarbon hydroxylase (AHH)-inducing potency of eight polychlorinated dibenzofuran (PCDF) isomers, 3,4,5,3',4',5'-hexachlorobiphenyl (HCB) and 2,3,7,8-tetrachlorodibenzo-p-dioxon (TCDD) in two inbred mouse strains (AHH responsive and nonresponsive mouse strains) and eight human lymphoblastoid cell lines (four males and four females) was investigated to evaluate their relative toxic potency.
	www.foxriverwatch.com /liver_hepatic_cancer_pcbs_1b.html (8832 words)

	WWW-IATE/PEDOL Publications Harms (Site not responding. Last check: 2007-10-13)
		Harms H.; Zehnder A.J.B. Influence of substrate diffusion on degradation of dibenzofuran and
		Wilkes H.; Francke W. Metabolism of dibenzofuran by Pseudomonas sp.
		Degradation or modification of dibenzofuran and dibenzo-p-dioxin by Pseudomonas
	lpe.epfl.ch /biblio_HH.html (1489 words)

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