polycyclic


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Related to polycyclic: Polycyclic aromatic hydrocarbons

polycyclic

[¦päl·i′sī·klik]
(organic chemistry)
A molecule that contains two or more closed atomic rings; can be aromatic (such as DDT), aliphatic (bianthryl), or mixed (dicarbazyl).
References in periodicals archive ?
The services consist of a mission to locate asbestos and polycyclic aromatic hydrocarbons (pahs) in asphalt before construction.
The likely culprit, scientists eventually deduced, was the intrinsic infrared emission from a class of organic molecules known as polycyclic aromatic hydrocarbons (PAHs), which, scientists would later discover, are amazingly plentiful; nearly 10 percent of all the carbon in the universe is tied up in PAHs.
3]' -- Choriatika Allantika Xipsitis Ltd -- contains more than the permitted levels of Polycyclic Aromatic Hydrocarbons (PAHs) which are a group of more than 100 different chemicals that are released from burning coal, oil, gasoline, trash, tobacco, wood, or other organic substances such as charcoal-broiled meat.
MT-TNO research into the biodegradation of soils and sediments contaminated with oils and polycyclic aromatic hydrocarbons (PAHs).
Studying the properties of the polycyclic aromatic hydrocarbon mid-infrared emission bands in distant universe is of fundamental importance to improving our understanding of the evolution of dust and chemical enrichment in galaxies throughout cosmic time," the University of California said in the statement.
Keywords: Polycyclic Aromatic Hydrocarbon (PAHs), Total Suspended Particulate Matter (TSPMs), Gas Chromatography, Organic Pollutant
Polycyclic aromatic hydrocarbons in cereals, cereal products, vegetables, vegetable products and traditionally smoked foods.
Forsgren presents papers on the sources, lifecycle and removal of polycyclic aromatic hydrocarbons (PAHs) from the environment.
Keywords: Dry deposition, Extraction, Polycyclic aromatic hydrocarbons, Snow, Sampling apparatus, Passive sampling.
Key statement: A rubber material is described, modified with a barrier material in the form of a copolymer which can be produced via ring-opening metathesis polymerization of a) at least one olefin monomer selected from the group consisting of monocyclic olefin monomers having one or two endocyclic C--C double bonds and bicyclic olefin monomers having one endocyclic C--C double bond and b) at least one polycyclic olefin monomer having at least two C--C double bonds.
Prenatal exposure to polycyclic aromatic hydrocarbons (PAHs) has previously been associated with higher incidence of depression, anxiety, and attention problems among highly exposed children.
The most toxic parts are the small aromatic solvents and the complex sheets of cyclic structures called polycyclic aromatic hydrocarbons.

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