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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.
Farlex Partner Medical Dictionary © Farlex 2012

polychlorinated biphenyl

The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

polychlorinated biphenyl

PCB. Any one of a family of industrial pollutants known to be capable of inducing cancer.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
Pregnant rats were exposed to vinclozolin (VIN), Aroclor 1,221 (A1221), or the vehicle (VEH) dimethylsulfoxide (DMSO) daily from E8-E18.
Chlorinated pesticides (OCP) and polychlorinated biphenyl (PCB) congeners (known collectively as Aroclor) are among the environmental organic compounds most difficult to measure.
Estradiol 17 AY, measured in serum pools, decreased significantly in fish exposed to 30 mg and 50 mg Aroclor 1242 (600.30 104.14, 823.75 211.95 pg/ml) respectively.
The profiles of sites 2 and 6 indicated that, the major component was Aroclor 1254 by the dominance of penta-homologue with 43.68% [47], in addition to the persistency of the heavier congeners started from penta-CB congeners in aerobic conditions [51]; moreover penta-congeners are not volatile.
RM 8504, Transformer Oil, is intended to be used as a diluent oil with transformer oil Standard Reference Materials (SRMs) 3075 to 3080 and SRM 3090 [1] when developing and validating methods for the determination of polychlorinated biphenyls (PCBs) as Aroclors (1) in transformer oil or similar matrices.
Based on the chromatogram analysis, the levels of Aroclors 1221, 1232, 1242, 1016, and 1248 in all fish samples were less than the minimum detectable (0.02 mg/kg) level.
Aroclors 1016, 1232, 1242, 1254, and 1260 have been gravimetrically prepared in methanol and transformer oil, mixed, and transferred to amber glass ampoules in approximately 1.2 mL aliquots.
Comparison of effects of Aroclors 1016 and 1260 on non-human primate catecholamine function.
(2) These commercial PCBs were sold in the United States under dozens of different trade names, of which the most commonly known was Aroclor. These products were mixtures that contained different PCB congeners, each with between 1 and 10 chlorine atoms.
Animal studies conducted in rodents and nonhuman primates exposed to PCBs and dioxins have observed similar outcomes to studies of humans, including suppressed antibody response to immunization with sheep red blood cells and reduced response to mitogen in lymphocyte proliferation assays, and provide a convincing body of evidence for the immunosuppressive effects of Aroclors and DL-PCBs [as reviewed by Kerkvliet (2009), Selgrade (2007), and Tryphonas (1995)].
For example, Monsanto marketed Aroclors 1221, 1231, and 1242 up to 1268, which contain, respectively, 21%, 31%, and 42% to 68% chlorine by weight.