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  • PCBs
  • A mixture of PCBs such as Aroclor may contain PCB compounds which are known estrogen agonists, but on the other hand are not classified as dioxin-like in terms of toxicity. (wikipedia.org)
  • dioxins
  • Polychlorinated dibenzo-p-dioxins Polychlorinated dibenzofurans Polychlorinated biphenyls 1,4-dioxin Because dioxins refer to such a broad class of compounds that vary widely in toxicity, the concept of toxic equivalency factor (TEF) has been developed to facilitate risk assessment and regulatory control. (wikipedia.org)
  • In reference to their importance as environmental toxicants the term dioxins is used almost exclusively to refer to the sum of compounds (as TEQ) from the above groups which demonstrate the same specific toxic mode of action associated with TCDD. (wikipedia.org)
  • toxic
  • TCDD binding to the AH receptor induces the cytochrome P450 1A class of enzymes which function to break down toxic compounds, e.g., carcinogenic polycyclic hydrocarbons such as benzo(a)pyrene (but making many of them more toxic in the process). (wikipedia.org)
  • reaction
  • however, with the use of ultrasound the reaction can also be made useful for the production of biphenyl compounds. (wikipedia.org)
  • The compound is quite stable and readily forms dimers and cyclic trimeric anhydrides, which complicate purification and tend to protodeboronize, a secondary reaction that occurs frequently in the Suzuki coupling, with elimination of the boronic acid function. (wikipedia.org)
  • chemical
  • Adverse sequelae of the chemical revolution have recently been recognized, with several studies confirming that many chemical compounds have accumulated and persist within the environment and within people [ 1 , 2 ], with attendant health sequelae in many cases [ 3 , 4 ]. (hindawi.com)
  • Although there are millions of chemical compounds available around the globe [ 7 ], only a fraction of these are regulated under specific legislation in key markets [ 8 ]. (hindawi.com)
  • S. paucimobilis is able to degrade lignin-related biphenyl chemical compounds. (wikipedia.org)
  • Endocrine disrupting compounds encompass a variety of chemical classes, including drugs, pesticides, compounds used in the plastics industry and in consumer products, industrial by-products and pollutants, and even some naturally produced botanical chemicals. (wikipedia.org)
  • A spiro compound, or spirane, from the Latin spīra, meaning a twist or coil, is a chemical compound, typically an organic compound, that presents a twisted structure of two or more rings (a ring system), in which 2 or 3 rings are linked together by one common atom, examples of which are shown at right. (wikipedia.org)
  • citation needed] In both cases, the presence of the spiro center, often with four distinct groups attached, and with its unique aspects of chirality, adds unique challenges to the chemical synthesis of each compound type. (wikipedia.org)
  • pesticides
  • For residents of the Aral sea region living there has led to high "exposure to industrial pollutants such as polychlorinated biphenyl (PCB) compounds and heavy metals but also to pesticides. (wikipedia.org)
  • mixture
  • It is chlorinated industrially to a mixture, polychlorinated biphenyl ( q.v. ), known as PCB, which is now much restricted because of its toxicity but formerly was used in paper coatings and as a lubricant and a heat-transfer fluid. (britannica.com)
  • benzene
  • Biphenyl is slightly less reactive chemically than benzene. (britannica.com)
  • When the aryllithium compound of 1-bromo-4-(diethoxymethyl)benzene is used with triisopropylborate at -78 °C instead of the Grignard compound (via n-butyllithium) 4-formylphenylboronic acid is obtained in 99% crude yield. (wikipedia.org)
  • properties
  • Perfluorinated compounds (PFCs) are man-made organofluorine chemicals manufactured and marketed for their stain-resistant properties. (hindawi.com)
  • The term endocrine disruptor is often used as synonym for xenohormone although the latter can mean any naturally occurring or artificially produced compound showing hormone-like properties (usually binding to certain hormonal receptors). (wikipedia.org)
  • citation needed] As well, the spiro motif is present in various practical compound types (such as dyes), as well as in a wide variety of oligo- and polymeric materials designs, for the unique shapes and properties the spiro center imparts, e.g., in the design of electronically active materials in particular. (wikipedia.org)
  • derivatives
  • 2. Biphenyl and its 4-hydroxy and 4,4′-dihydroxy derivatives are extensively excreted in the bile as glucuronides in amounts increasing in order of molecular weight. (biochemj.org)
  • It is believed that all the stilbenes are the derivatives of resveratrol (3,5,4'-trihydroxy-trans-stilbene) or compounds close to it (pinosylvin or piceatannol). (bireme.br)
  • similar
  • It is suggested that the mechanism of the biliary excretion of foreign compounds may be similar to that of conjugated bile acids, which are highly polar and whose molecular weights exceed 400. (biochemj.org)
  • The column converts benzyl chloride to bibenzyl in a Wurtz coupling and in a similar fashion dibenzothiophene is reduced to biphenyl. (wikipedia.org)
  • least
  • The liquid crystal composition comprises at least two liquid crystal compounds including at least one liquid crystal. (google.com.au)
  • The liquid crystal composition comprises at least two liquid crystal compounds including at least one liquid crystal compound which has a temperature range in which it shows cholesteric phase. (google.com.au)