dict.md logo
Choose languages of interest
Add further languages:
Add all languages
Hydrocarbons, Aromatic definition: Organic compounds containing carbon and hydrogen in the form of an unsaturated, usually hexagonal ring structure. The compounds can be single ring, or double, triple, or multiple fused rings.
Polycyclic Hydrocarbons, Aromatic definition: A major group of unsaturated cyclic hydrocarbons containing two or more rings. The vast number of compounds of this important group, derived chiefly from petroleum and coal tar, are rather highly reactive and chemically versatile. The name is due to the strong and not unpleasant odor characteristic of most substances of this nature. (From Hawley's Condensed Chemical Dictionary, 12th ed, p96)
Polycyclic Aromatic Hydrocarbons definition: Polycyclic aromatic hydrocarbons (PAH) are a large class of organic compounds containing two or more fused aromatic rings made up of carbon and hydrogen atoms. They have high melting and boiling-points, low vapour pressure, water solubility, and are highly lipophilic. PAH are produced during incomplete combustion or pyrolysis of organic matter, are found in cigarette smoke, motor vehicle exhaust, used motor lubricating oil, broiled meat, coal tar, crude oil, creosote, roofing tar, dyes, plastics, and pesticides. Some members of PAH class were shown to have carcinogenic, genotoxic, and immunotoxic properties, developmental toxicity and affect reproductive health. (NCI)
Arylesterase definition: Acts on many phenolic esters. The reactions of EC aryldialkylphosphatase, were previously attributed to this enzyme. [EC created 1961, modified 1989] (from IUBMB Enzyme Nomenclature).
Amino Acids, Aromatic definition: Amino acids containing an aromatic side chain.
Aromatic Amines definition: Amine having a univalent organic group (as phenyl) derived from an aromatic hydrocarbon by the removal of one hydrogen atom. (ISV)
aromatic-amino-acid:2-oxoglutarate aminotransferase activity definition: Catalysis of the reaction: an aromatic amino acid + 2-oxoglutarate = an aromatic oxo acid + L-glutamate. [EC:]
cellular aromatic compound metabolic process definition: The chemical reactions and pathways involving aromatic compounds, any organic compound characterized by one or more planar rings, each of which contains conjugated double bonds and delocalized pi electrons, as carried out by individual cells. [GOC:ai, ISBN:0198506732 "Oxford Dictionary of Biochemistry and Molecular Biology"]
aromatic compound biosynthetic process definition: The chemical reactions and pathways resulting in the formation of aromatic compounds, any substance containing an aromatic carbon ring. [GOC:ai]
aromatic compound catabolic process definition: The chemical reactions and pathways resulting in the breakdown of aromatic compounds, any substance containing an aromatic carbon ring. [GOC:ai]
aromatic amino acid transport definition: The directed movement of aromatic amino acids, amino acids with aromatic ring, into, out of, within or between cells. [GOC:ai]
aromatic hydrocarbon receptor definition: approximately 280kD soluble protein complex; binds and mediates carcinogenesis by polycyclic aromatic hydrocarbons, heterocyclic amines, and chlorinated aromatic compounds.
Aromatic-L-Amino-Acid Decarboxylases definition: An enzyme group with broad specificity. The enzymes decarboxylate a range of aromatic amino acids including dihydroxyphenylalanine (DOPA DECARBOXYLASE), tryptophan, and hydroxytryptophan. EC
Aromatic Compounds definition: Historically, the term "aromatic" originally referred to the smell of selected compounds that later were found to contain benzene or fused benzene rings in the structure. In a structural sense, it designates compounds that, in accordance with the theory of Huckel, have a cyclic, delocalized (4n+2) pi-electron system. This includes arenes and their substitution products (e.g., benzene, naphthalene, toluene). The term has been generalized to include aromatic heterocyclic structures, such as thiophene and pyridine, but it is more precise to call compounds of the latter type heteroaromatic.
Carcinogenic Halogenated Aromatic Hydrocarbon definition: A compound that can increase human cancer risk and consists of hydrogen and carbon atoms arranged in a symmetrical 6-carbon ring structure with single and double bonds alternating around the ring (benzene ring) and in which at least one of the hydrogen atoms is substituted for a halogen (chlorine, bromine, fluorine) atom. These carcinogenic compounds can have single, double or multiple fused rings and can have other chemical groups attached to them in place of hydrogen. (NCI05)
Carcinogenic Polycyclic Aromatic Hydrocarbon definition: Carcinogenic Polycyclic Aromatic Hydrocarbons (PAH) are ubiquitous environmental pollutants that are formed in the process of incomplete burning of organic material and can cause cancer in humans. PAH molecules are made up of two or more fused aromatic rings. PAH causes a carcinogenic effect by metabolic activation to diol epoxides, which bind covalently to DNA. (NCI05)
Carcinogenic Aromatic Amine definition: Potentially cancer-causing compound containing amine with an aromatic ring substituted for one or more of its hydrogen atoms, i.e., -NH2, -NH- or nitrogen group(s) attached to an aromatic hydrocarbon, whose structure usually contains one or more benzene rings. This group includes many industrial and tobacco carcinogens. (NCI05)
aromatisch definition: [1] einen intensiven, angenehmen Geschmack oder Duft habend [2] Chemie, bei organischen Verbindungen, ohne Steigerung: zyklische Kohlenstoffketten enthaltend