polychlorinated biphenyl

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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.

pol·y·chlo·rin·at·ed bi·phen·yl (PCB),

biphenyl in which some or all of the hydrogen atoms attached to ring carbons are replaced by chlorine atoms; a [probable] human carcinogen and teratogen.

polychlorinated biphenyl


pol·y·chlo·rin·at·ed bi·phe·nyl

(polē-klōri-nā-tĕd bī-fenil)
Agent in which some or all of the hydrogen atoms attached to ring carbons are replaced by chlorine atoms; possible human carcinogen and teratogen.

polychlorinated biphenyl

PCB. Any one of a family of industrial pollutants known to be capable of inducing cancer.
References in periodicals archive ?
He and other researchers have reported that PCBs harm cognitive maturation in children.
Wise, Standard Reference Materials (SRMs) for the Calibration and Validation of Analytical Methods for PCBs (as Aroclor Mixtures), J.
The 32-employee plant has been operating environmentally safe disposal of high-level PCB transformers, capacitors and other PCB equipment since 1998.
The IRS felt that taking this position would be contrary to the intent of Congress when it defined PCB under Sec.
PCBs are a family of more than 200 related organic compounds that many industries have used, especially for electrical insulation.
Federal regulations implemented in 1998 require that owners register or dispose of PCB transformers.
EPA officials said Thursday the import ban is no longer necessary because the industry has enough incinerator capacity to handle safely the foreign volume of PCB waste.
Clean-up of PCB is especially difficult for commercial building owners without in-house engineering capabilities.
During off-site processing, the PCB fluid is drained from the transformer and replaced with an interim fluid that leaches PCBS from the unit's core and coil.
Now, in an in vitro study using human brain stem cells, a team of German and Californian researchers shows how a specific PCB congener, PCB-118, can interrupt normal TH function and cause the premature differentiation of one type of brain cell [EHP 113:871-876].
Among fish deprived of food, for instance, those that received PCBs had a less-active form of the protein called lectin in their blood than did fish whose diets were free of PCBs.
The clear, oily, insulating compounds known as PCBs are often found in waterways after being carelessly discarded in the wake of the 1974 ban.