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 ?
The study was conducted by using biphenyl (E7), a room temperature nematic liquid, formed by combining four different "cyano biphenyl liquid crystals" i.
In addition, Losatan, an antihypertensive agent, has a biphenyl moiety acting as a spacer within the structure [4].
Chiral biphenyl dopants, conformationally restricted (1-8) and unrestricted (9-19) biphenyl core were investigated by using DFT studies, the computed data of dipole moment () and dihedral angle between two phenyl rings (Fig.
A cohort study of behavioral problems and intelligence in children with high prenatal polychlorinated biphenyl exposure.
Improved HPLC Analysis of Steroids: Introducing the Allure[TM] Biphenyl Column for Unsaturated Pharmaceuticals Application Note 580020, Restek Corporation, 2005.
Niimi (1988), "Trophodynamic Analysis of Polychlorinated Biphenyl Congeners and Other Chlorinated Hydrocarbons in the Lake Ontario Ecosystem," Environmental Science and Technology, 22(4):388-397.
Commercial preparations contain few or no strictly coplanar PCB or polybrominated biphenyl congeners.
There was no significant association between polychlorinated biphenyl levels and changes in cycle length or hormone levels.
Polychlorinated biphenyl concentration in raw and cooked north Atlantic bluefish fillets.
Aroclors) typically consist of 60-90 of the 209 possible congeners, each of which differs in the positions and/or numbers of chlorines on the biphenyl ring.
First, polybrominated biphenyl exposures have been associated with earlier menarche in girls, whereas experimental models show delayed puberty, a discordance that may be due to timing of exposure (Blanck et al.
The directive requires that all new electrical equipment shipped to the European market after July 2006 contain less than maximum levels of the substances such as heavy metals (lead, cadmium, mercury, hexavalent chromium) and bromated flame retardants (polybromated biphenyl or polyborminated diphenyl ethers).