• Aromatic hydrocarbons can be monocyclic (MAH) or polycyclic (PAH). (wikipedia.org)
  • The group is a major subset of the aromatic hydrocarbons . (wikipedia.org)
  • Polycyclic aromatic hydrocarbons are discussed as possible starting materials for abiotic syntheses of materials required by the earliest forms of life . (wikipedia.org)
  • By definition, polycyclic aromatic hydrocarbons have multiple cycles, precluding benzene from being considered a PAH. (wikipedia.org)
  • These standards play a preeminent role in all aspects important to aromatic hydrocarbons, their derivatives, and related chemicals. (astm.org)
  • Through-space isotropic NMR shielding values of a perpendicular diatomic hydrogen probe moved in a 0.5 Å grid 2.5 Å above several polycyclic aromatic/antiaromatic ring and aromatic/aromatic hydrocarbons were computed with Gaussian 03 at the GIAO HF/6-31G(d,p) level. (mdpi.com)
  • Mills, K.H. Computed NMR Shielding Effects over Fused Aromatic / Antiaromatic Hydrocarbons. (mdpi.com)
  • 4.1 Organic and inorganic chlorine compounds can have a deleterious effect on equipment and reactions in processes involving aromatic hydrocarbons. (astm.org)
  • 1.1 This test method covers the determination of total chloride (organic and inorganic) in liquid aromatic hydrocarbons and cyclohexane. (astm.org)
  • Chemical agents that have been characterized as carcinogenic, or are suspected to be carcinogenic in humans including polycyclic aromatic hydrocarbons, nitrosamines, heterocyclic amines, aromatic amines , DES and estrogens, as well as metals and metalloids such as chromium, mercury and arsenic are of interest to NCI. (thefreedictionary.com)
  • In the present study seventy smokeless tobacco products from the US and Sweden, categorized as chewing tobacco, dry and moist snuff, hard and soft pellets, plug, and loose and portion snus, were analysed for twenty one polycyclic aromatic hydrocarbons (PAHs). (biomedcentral.com)
  • The list contains 93 compounds, of which 14 are polycyclic aromatic hydrocarbons (PAHs). (biomedcentral.com)
  • Polycyclic aromatic hydrocarbons (PAHs), widespread pollutants in the marine environment, can produce adverse effects in marine organisms and can be transferred to humans through seafood. (biomedcentral.com)
  • Resonantly stabilized radicals, such as propargyl, cyclopentadienyl, benzyl, and indenyl, play a vital role in the formation and growth of polycyclic aromatic hydrocarbons (PAHs) that are soot precursors in engines and flames. (uga.edu)
  • Purified rat liver nuclei covalently bound low levels of seven aromatic [ 14 C]hydrocarbons to nuclear DNA. (elsevier.com)
  • Rogan, EG , Mailander, P & Cavalieri, E 1976, ' Metabolic activation of aromatic hydrocarbons in purified rat liver nuclei: induction of enzyme activities and binding to DNA with and without monooxygenase catalyzed formation of active oxygen ', Proceedings of the National Academy of Sciences of the United States of America , vol. 73, no. 2, pp. 457-461. (elsevier.com)
  • Known and suspect occupational bladder carcinogens include aromatic amines, diesel exhaust, cutting oil mist, polycyclic aromatic hydrocarbons, aryl hydrocarbons, and their derivatives. (cancer.gov)
  • Coal tar contains a lot of aromatic hydrocarbons (which are usually pretty nasty molecules) and too high a percentage is carcinogenic. (thefreedictionary.com)
  • Toxic components of oil, known as polycyclic aromatic hydrocarbons (PAHs) can enter the body, resulting in the production of harmful reactive oxygen species, which can be terminated by the body's protective biochemical processes - such as antioxidant defense systems. (mote.org)
  • With relation to chemical terminology, aromatic hydrocarbons or arenes, alkanes, alkenes and alkyne-based compounds composed entirely of carbon or hydrogen are referred to as "pure" hydrocarbons, whereas other hydrocarbons with bonded compounds or impurities of sulphur or nitrogen, are referred to as "impure", and remain somewhat erroneously referred to as hydrocarbons. (pei.org)
  • The configuration of six carbon atoms in aromatic compounds is known as a benzene ring, after the simplest possible such hydrocarbon, benzene . (wikipedia.org)
  • are also called aromatic compounds. (wikipedia.org)
  • Examples of non-benzene compounds with aromatic properties are furan , a heterocyclic compound with a five-membered ring that includes a single oxygen atom, and pyridine , a heterocyclic compound with a six-membered ring containing one nitrogen atom. (wikipedia.org)
  • The simplest of such chemicals are naphthalene , having two aromatic rings, and the three-ring compounds anthracene and phenanthrene . (wikipedia.org)
  • In animals and humans, aromatic amino acids serve as precursors for the synthesis of many biologically/neurologically active compounds that are essential for maintaining normal biological functions. (frontiersin.org)
  • The EC has banned toluidines and related compounds from cosmetics but a team of scientists in Sweden has found that hairdressers are still being exposed to carcinogenic aromatic amines. (spectroscopynow.com)
  • Given the desirability to valorize underutilized feedstocks such as lignin, we investigated the ability of T. oleaginosus to tolerate and metabolize lignin-derived aromatic compounds. (biomedcentral.com)
  • Many of these aromatics are representative lignin hydrolysate compounds or common products of lignin depolymerization [ 6 ]. (biomedcentral.com)
  • Quinazolines are compounds containing a quinazoline moiety, which is made up of two fused six-member aromatic rings, a benzene ring and a pyrimidine ring. (hmdb.ca)
  • These are organic aromatic compounds containing a sulfanilide moiety, with the general structure RS(=O)(=O)NC1=CC=CC=C1. (hmdb.ca)
  • 2] (and/or acetate) in complex anaerobic microbial communities that degrade chlorinated aromatic compounds is also useful because of the key roles that these populations play in sustaining biodegradation of the parent compounds (Becker et al. (thefreedictionary.com)
  • The differences in the aromatic profiles of wines obtained in the single and in the mixed-fermentations correlated with the differential expression of S. cerevisiae genes encoding enzymes required for formation of aroma compounds. (biomedcentral.com)
  • On the contrary, their recommendations, typically those of the ILO with regard to asbestos and aromatic amines , have been blatantly disregarded by most industrialized countries. (thefreedictionary.com)
  • However, in all these strategies synthesis of this scaffold is problematic due to the limited nucleophilicity of aromatic amines [24-31]. (thefreedictionary.com)
  • 1979) suggested that the effect of exposure to aromatic amines (bladder cancer), by occupation (e. (thefreedictionary.com)
  • Some Naturally Occurring Substances: Food Items and Constituents, Heterocyclic Aromatic Amines and Mycotoxins. (thefreedictionary.com)
  • A century later, they were followed by arsenic used in therapy (17), aromatic amines (18), and thereafter by a long series of chemicals or chemical mixtures that, for the most part, were found to be human carcinogens in the working environment (19). (thefreedictionary.com)
  • This association was first observed in 1895, when Rehn (1) demonstrated the link between exposure to aromatic amines and development of bladder cancer in factory workers. (thefreedictionary.com)
  • Epoxy curing agents for use in all epoxy application arenas include aromatic amines , aliphatic and cycloaliphatic mines, ketamines, polyamides, polyamine adducts and salts, amido-amine and accelerated amines. (thefreedictionary.com)
  • Supplies DMP-10 and DMP-30 aromatic amines as epoxy curing agents. (thefreedictionary.com)
  • Some of these contain chemicals that have been linked to bladder cancer, namely aromatic amines like toluidines and alkylanilines. (spectroscopynow.com)
  • A study measuring both exposure to aromatic amines and product analysis for the same amines would strengthen the conclusions about hairdressers' exposure to carcinogenic aromatic amines, and is encouraged," say the research team. (spectroscopynow.com)
  • PAHs are uncharged, non-polar molecules, with distinctive properties due in part to the delocalized electrons in their aromatic rings. (wikipedia.org)
  • Typical conditions involve heating the aromatic compound with sulfuric acid: C6H6 + H2SO4 → C6H5SO3H + H2O Sulfur trioxide or its protonated derivative is the actual electrophile in this electrophilic aromatic substitution. (wikipedia.org)
  • Aromatic acids are a type of aromatic compound. (wikipedia.org)
  • A polycyclic aromatic hydrocarbon ( PAH ) is a hydrocarbon -a chemical compound containing only carbon and hydrogen-that is composed of multiple aromatic rings . (wikipedia.org)
  • 2. Chemistry An aromatic organic compound. (thefreedictionary.com)
  • Also called an aromatic compound . (thefreedictionary.com)
  • Aquino F, Karge R, Pauling H, Bonrath W. Dehydration of Aromatic Heterocyclic Carboxamides to Aromatic Heterocyclic Carbonitriles. (mdpi.com)
  • An aromatic hydrocarbon or arene [1] (or sometimes aryl hydrocarbon ) [2] is a hydrocarbon with sigma bonds and delocalized pi electrons between carbon atoms forming a circle. (wikipedia.org)
  • Aromatic characteristics, obtained from the aryl and O-aryl groups, also showed the lowest proportions in the CR plot and the highest aromaticity in the 2 BF plots. (thefreedictionary.com)
  • The two main types are electrophilic aromatic substitution when the active reagent is an electrophile and nucleophilic aromatic substitution when the reagent is a nucleophile. (wikipedia.org)
  • In radical-nucleophilic aromatic substitution the active reagent is a radical. (wikipedia.org)
  • Aromatic sulfonation is an organic reaction in which a hydrogen atom on an arene is replaced by a sulfonic acid functional group in an electrophilic aromatic substitution. (wikipedia.org)
  • Due to their electron withdrawing effects, sulfonate protecting groups can be used to prevent electrophilic aromatic substitution. (wikipedia.org)
  • oil extracts, alcohol extracts, watery extracts and we even distill some of these herbs to produce an aromatic water called a hydrosol. (blogspot.com)
  • The degree of aromaticity of the different materials, calculated as the ratio of the number of aromatic carbons to the total number of atoms in the backbone, according to Calundann and Jaffe (39) is also reported in Table 4. (thefreedictionary.com)
  • Fuel oil is made of long hydrocarbon chains, particularly alkanes, cycloalkanes and aromatics. (pei.org)
  • There are several categories of aromatic acids including: Phenolic acids: substances containing an aromatic ring and an organic carboxylic acid function (C6-C1 skeleton). (wikipedia.org)
  • We are delighted by the updated information on aromatic amino acid metabolism covered in the articles of our research topic. (frontiersin.org)
  • Overall, the articles that were received for this topic: "Aromatic Amino Acid Metabolism," including a collection of original research and review articles, provided updated information regarding the aromatic amino acid metabolism, and addressed their synthesis and catabolism in plants and microbes, metabolic enzymes in animals and humans, and structure and function relationships of enzymes involved in the metabolism. (frontiersin.org)
  • De-aromatic solvents, also called dearomatized hydrocarbon solvents or ultra-low aromatic solvents, are a class of hydrocarbon solvents that are characterized by the presence of paraffinic, iso-paraffinic, and naphthenic components with very low aromatic content. (sbwire.com)
  • De-aromatic solvents market are of three types, namely low flash point, medium flash point, and high flash point. (sbwire.com)
  • Major players in de-aromatic solvents market have channelized efforts towards developing eco-friendly or green product offerings that employ bio-based raw materials for their synthesis and, thus, eventually do away with the use of conventional solvents in certain applications. (sbwire.com)
  • Another major factor that is projected to impede growth of the de-aromatic solvents market, especially in paints & coatings application segment, is increasing demand for water-based paints & coatings, powder coatings, among others across the globe. (sbwire.com)
  • Consumption of de-aromatic solvents is expected to increase from 1,718,100 metric tons in 2015 to 2,230,972 kilotons by 2022, increasing at a CAGR of 3.8% during the forecast period. (sbwire.com)
  • Asia-Pacific accounted for the largest revenue share of the global de-aromatic solvents market in 2014, and the market in the region is anticipated to increase at the highest CAGR over the forecast period. (sbwire.com)
  • Consumption of de-aromatic solvents in Asia-Pacific is projected to increase by 1.4X between 2014 and 2022. (sbwire.com)
  • Total S.A., and Idemitsu Kosan Co., Ltd. are among the leading players in the global de-aromatic solvents market. (sbwire.com)
  • Many enzymes involved in aromatic amino acids metabolism have been drug targets for diseases including neurodegenerative diseases, schizophrenia, and cancers. (frontiersin.org)
  • In addition, since animals or humans that do not possess the enzymatic machinery for the de novo synthesis of aromatic amino acids must obtain these primary metabolites from their diet, the metabolism of aromatic amino acid by both the host animal and the resident microflora are important for the health of humans and all animals. (frontiersin.org)
  • Though the exact pathway of aromatic metabolism remains to be determined for T. oleaginosus , the results presented in this work motivate use of this organism for lignin valorization and phenolic wastewater bioremediation. (biomedcentral.com)
  • There are many pathways for aerobic aromatic metabolism, with the ortho- and meta-cleavage pathways being most common [ 19 ]. (biomedcentral.com)
  • C6H6 + H2SO4 + SOCl2 → C6H5SO3H + SO2 + 2 HCl Chlorosulfuric acid is also an effective agent: C6H6 + HSO3Cl → C6H5SO3H + HCl In contrast to aromatic nitration and most other electrophilic aromatic substitutions this reaction is reversible. (wikipedia.org)
  • Picene is a phenacene-type aromatic hydrocarbon molecule with five benzene rings. (elsevier.com)
  • These yeasts have evolved to handle a wide variety of aromatic substrates, utilizing so-called funneling pathways to convert diverse molecular species into a small number of metabolites [ 19 ]. (biomedcentral.com)
  • Phenanthrene Metabolites from a New Polycyclic Aromatic Hydrocarbon-Degrading Bacterium Aeromonas salmonicida subsp. (uga.edu)
  • QYResearch Group is provides the complete and deep research report on 'Global Aromatic Hydrocarbon Solvent Market 2017' to its huge collection. (sbwire.com)
  • Deerfield Beach, FL -- ( SBWIRE ) -- 12/14/2017 -- Global Aromatic Hydrocarbon Solvent Market 2017 presents a far reaching and basic investigation of Aromatic Hydrocarbon Solvent business along the edge of the examination of subjective angles that is ready to exhibit key business bits of knowledge to the perusers. (sbwire.com)
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  • Included in that class are substances containing an aromatic ring and an organic acid functional group. (wikipedia.org)
  • Herbicides and antibiotics take advantage of this by inhibiting enzymes involved in aromatic amino acid synthesis, thereby making them toxic to micro-organisms and plants but not to animals. (frontiersin.org)
  • included in this topic, describes the aromatic amino acid biosynthetic pathways in plants and microbes, catabolism in plants, degradation via the monoamine and kynurenine pathways in animals, and catabolism via the 3-aryllactate and kynurenine pathways in animal-associated microbes. (frontiersin.org)
  • L-Tyrosine is an aromatic amino acid synthesized de novo in plants and microbes via two alternative routes mediated by a TyrA family enzyme, prephenate, or arogenate dehydrogenase, typically found in microbes and plants, respectively. (frontiersin.org)
  • Tryptophan is another aromatic amino acid, which can be oxidized by tryptophan 2,3-dioxygenase and indoleamine 2,3 dioxygenase in the initial step in tryptophan catabolism in animals and humans. (frontiersin.org)
  • On the basis of the partial purification and characterization of these aromatic amino acid transaminases, it is suggested that rat small intestine contains several kinds of aromatic amino acid transaminases. (biochemj.org)
  • Cu Humic Acid is a high polymer heterogeneous aromatic hydroxyl salt. (ecplaza.net)
  • A work in with the 808 accelerant, add magnesia or oxyhydrogen magnesium as suck-acid agent at the same time, then add the calcium oxide and aromatic oil and charcoal and so on stuffing. (fuzing.com)
  • The main objective of this study was the screening of some selected aromatic plants very popular in Greece, with respect to their total phenolic content, antioxidant capacity, reducing activity, and oxidative stability. (mdpi.com)
  • Aromatic plants are well known for their antioxidant and antimicrobial properties that prevent food degradation and alteration [ 1 ], as they are rich in phenolic substances, usually referred to as polyphenols, which are ubiquitous components of plants and herbs. (mdpi.com)
  • According to Clar's rule, [17] the resonance structure of a PAH that has the largest number of disjoint aromatic pi sextets -i.e. benzene -like moieties-is the most important for the characterization of the properties of that PAH. (wikipedia.org)
  • Essential oils, are highly concentrated substances extracted from various parts of aromatic plants and trees. (spintoband.com)
  • Benzene , C 6 H 6 , is the simplest aromatic hydrocarbon, and it was the first one named as such. (wikipedia.org)
  • Our company is the leading producers of White Spirit high Aromatic industrial Grade. (tradekey.com)
  • In aromatic substitution one substituent on the arene ring, usually hydrogen, is replaced by another substituent. (wikipedia.org)
  • Trichosporon oleaginosus is the first yeast shown to be oleaginous while growing on aromatic substrates, and shows great promise as a model industrial microbe for biochemical and biofuel production from depolymerized lignin. (biomedcentral.com)
  • Understanding the biochemical pathways of aromatic metabolizing organisms enables downstream engineering for high value products, such as oleochemicals for pharmaceutical, fuel, and specialty chemical applications. (biomedcentral.com)
  • All plants and micro-organisms synthesize their own aromatic amino acids to make proteins. (frontiersin.org)
  • This randomized, double blind, parallel group study, compared the efficacy of spray containing aromatic essential oils of some herbal plants, against placebo in the treatment of patients with acute Rhino-sinusitis. (clinicaltrials.gov)
  • An initial BLAST search suggests this yeast has putative aromatic metabolizing genes. (biomedcentral.com)
  • Genes encoding for the catalytic alpha subunit of aromatic ring-hydroxylating dioxygenases (ARHDs) were amplified from intertidal sediment samples using two different primer sets. (biomedcentral.com)