biphenyl


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biphenyl

 [bi-fen´il]
polybrominated biphenyl (PBB) any of various brominated derivatives of biphenyl; uses and toxic hazards are similar to those of polychlorinated biphenyls. They typically are deposited in body fat stores and are rarely mobilized except through lactation.
polychlorinated biphenyl (PCB) any of various chlorinated derivatives of biphenyl, toxic and carcinogenic nonbiodegradable compounds used as heat-transfer agents and electrical insulators; they are readily absorbed from the gastrointestinal tract, and those with a lower percentage of chlorine are associated with a higher toxicity but are more readily excreted.

di·phen·yl

(dī-fen'il),
Colorless liquid; used as heat transfer agent, frequently as polychlorinated biphenyls (PCBs); as fungistat for oranges (applied to inside of shipping container or wrappers); and in organic syntheses. Produces convulsions and central nervous system depression.
Synonym(s): biphenyl, phenylbenzene

biphenyl

/bi·phen·yl/ (-fen´il) diphenyl.
polychlorinated biphenyl  (PCB) any of a group of chlorinated derivatives of biphenyl, used as heat-transfer agents and electrical insulators; they are toxic, carcinogenic, and non-biodegradable.

di·phen·yl

(dī-fen'il)
Colorless liquid that is used as a heat transfer agent, frequently as a polychlorinated biphenyl (PCB); used as fungistat for oranges and in organic syntheses. Produces convulsions and central nervous system depression.
Synonym(s): biphenyl, phenylbenzene.

biphenyl

polybrominated and polychlorinated biphenyls are widely used industrial chemicals, as flame retardants, heat transfer agents and electrical insulators.

biphenyl poisoning
these chemicals are not known to produce illness in the average environment, but they accumulate in fat and have a very slow rate of excretion and biodegradability. Experimental poisoning causes diarrhea, poor weight gain, growth retardation and abortion.
References in periodicals archive ?
A cohort study of behavioral problems and intelligence in children with high prenatal polychlorinated biphenyl exposure.
Toft (1998), "Comparative Carcinogenicity in Sprague-Dawley Rats of the Polychlorinated Biphenyl Mixtures Aroclors 1016, 1242, 1254, and 1260," Toxicological Sciences, 41(1):62-76.
Ganey and Boyd (2005) used the bioremediation of polychlorinated biphenyls (PCBs) as an example, which was an excellent choice.
The team examined serum samples for suspected endocrine disruptors including DDT, DDE, 4 other chlorinated pesticides, and 10 polychlorinated biphenyls.
We also found that polychlorinated biphenyls (PCBs), toxaphene, dieldrin, dioxins, and polybrominated diphenyl ethers occurred at higher concentrations in European farm-raised salmon than in farmed salmon from North and South America.
Reductive dechlorination is a microbially mediated process that removes chlorine from biphenyl with replacement by hydrogen, resulting in a product mixture in which the average number of chlorines is substantially diminished.
Retrospective time-trend study of polybrominated diphenyl ether and polybrominated and polychlorinated biphenyl levels in human serum from the United States.
The RoHS Directive prohibits new electrical and electronic equipment from being placed on the market after July 1, 2006, if they contain higher than specified levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE) flame retardants.
The pesticides known as chlordanes belong to a class of long-lasting organochlorine pollutants that includes DDT and polychlorinated biphenyl, or PCB.
The use of lead and other hazardous materials including mercury, hexavalent chromium, cadmium, poly-brominated biphenyl and poly-brominated diphenyl ether flame-retardants in electronic products is an increasingly visible and challenging environmental concern.
SAN FRANCISCO -- Greater levels of polychlorinated biphenyls in the blood were associated with worse neuropsychological executive functioning in a study of 276 adults, Richard F.
However, as a new link in the Great Lakes food chain, Ricciardi worries, the fatty crustacean could boost concentrations of pollutants such as polychlorinated biphenyls in the larger fish.