The invention provides methods for substituting polyaromatic hydrocarbons or polyheterocyclic compounds with perfluoroalkyl groups. The methods can include heating a polyaromatic hydrocarbon substrate or a polyheterocyclic compound substrate in the presence of a perfluoroalkyl iodide, typically in a closed system, wherein the heating is sufficient to bring both the polyaromatic hydrocarbons or polyheterocyclic compound, and the perfluoroalkyl iodide, into the gas phase, thereby allowing the substrate to react with the perfluoroalkyl iodide in the gas phase to form polyaromatic hydrocarbons or polyheterocyclic compounds having one or more perfluoroalkyl substituents. The methods allow for the creation of versatile libraries of novel perfluoroalkyl-containing derivatives that can serve as important building blocks and active components in biomedical, electronic, and materials applications.
Consumption of charbroiled red meat and meat-derived polycyclic aromatic hydrocarbons (PAHs) has been associated with risk of colorectal adenoma, a precursor of colorectal cancer. Furthermore, leukocyte PAH-DNA adduct levels have been demonstrated to increase in response to charbroiled red meat intake but to date there have been no studies that have investigated the relationship between leukocyte PAH-DNA adduct levels and risk of colorectal adenoma. We investigated the relation of leukocyte PAH-DNA adduct formation and colorectal adenoma in a clinic-based case-control study of colorectal adenomas. The study comprised 82 cases of colorectal adenoma and 111 polyp-free controls, none of whom were current smokers. Leukocyte PAH-DNA adducts were measured by a sensitive chemiluminescence immunoassay using an antiserum elicited against DNA modified with (±)-7β,8α-dihydroxy-9α,10α-epoxy-7,8,9,10-tetrahydro-benzo[a]pyrene that recognizes several PAHs bound to human DNA. Leukocyte PAH-DNA adduct ...
In a former communication (Cook, Dodds, Hewett, and Lawson, 1934) we recorded the oestrogenic activity of a number of polycyclic aromatic and hydroaromatic compounds. The most active substances were found among a series of diols related to the carcinogenic hydro-carbon, 1 : 2 : 5 : 6-dibenzanthracene. We have now extended our investi-gation to seven new members of this series and have also examined a variety of diols of analogous structure, but containing other ring systems. Table I summarizes the results obtained in tests for oestrogenic activity carried out with 9: 10-dihydroxy-9: 10-dialkyl-9: 10-dihydro-1: 2: 5: 6- dibenzanthracenes. In none of the new compounds has the activity exceeded that of the most potent compound previously described, namely, the di-n-propyl derivative in this series. Among the straight-chain dialkyl compounds this di-n-propyl compound represents a peak of activity in a series of which the first (methyl) and higher (n-amyl, n-hexyl) members are inactive. Two ...
Preventative measures are particularly important since the number of subjects affected is directly related to work place conditions. These agents are used as cold hardening agents in the epoxide resin industry. At high concentrations, direct contact with ethanolamine induces irritative lesions. Heating of diethanolamine to between 40°C and 60°C results in a vapour which can induce sensitisation in subjects present in the work place and provoke asthmatic attacks ...
Article Spatial and temporal variations of nitro-polycyclic aromatic hydrocarbons in PM 2.5 aerosols in Yangtze River Delta Region, China. Nitrated polycyclic aromatic hydrocarbons (nitro-PAHs) are of great interest because of their high potentia...
... , PAHs, short for polycyclic aromatic hydrocarbons, are a group of chemicals consisting of numerous carbon atoms joined together to form multiple rings. There are at least 10,000 different PAH compounds. Most are formed from the incomplete combustion of plant or animal matter, or carbon fuels, such as coal or petroleum.
GC Application #15560: Polynuclear Aromatic Hydrocarbons (PAHs) on ZB-5MS. Column used: Zebron™ ZB-5MS, GC Cap. Column 20 m x 0.18 mm x 0.18 µm, Ea Part#: 7FD-G010-08
GC Application #16187: Polynuclear Aromatic Hydrocarbons (PAHs): US and EU Analytes on ZB-MR1. Column used: Zebron™ ZB-MultiResidue™-1, GC Cap. Column 30 m x 0.25 mm x 0.25 µm, Ea Part#: 7HG-G016-11
DDQ/H+ oxidation system which is known to oxidize a variety of aromatic donors with oxidation potential as high as 1.8 V vs. SCE to the corresponding cation radicals can be effectively employed for the preparation of a variety of polyaromatic hydrocarbons. The development of DDQ/H+ oxidation system for oxidative C-C bond formation (or Scholl reaction) also allowed us to provide insight into the controversial arenium-ion (proton transfer) versus cation-radical (electron transfer) pathways for the Scholl reaction. A series of carefully-designed experiments provided evidences in support of cation radical pathway for the Scholl reaction. A detailed case study of oxidative cyclodehydrogenation of tetraveratrylethylene was also undertaken using a variety of traditional !-electron oxidants (such as FeCi}, NO+BF4-, and DDQ/H+), in order to further probe the arenium ion versus cation radical pathways for the Scholl reaction. This case study further asserted that oxidative C-C bond formations most likely occur
The present invention relates to compositions for preventing or treating skin disorders using vitamin B3 compounds and polycyclic compounds. The present invention also relates to methods for regulating skin condition.
Definition of suprasterol in US English - Either of two isomeric polycyclic compounds (suprasterol I, suprasterol II), produced by prolonged
Presenting recently issued patents for your consideration, including polycyclic compounds, fusion protein, optically activated particles, marine botanicals, temparature-changing cosmetics and more.
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Environmental and personal air samples were analyzed for methylene- chloride (75092), 2-butanone (78933), toluene (108883), and xylene (1330207) at a roof installation work site in Baltimore, Maryland, on September 23 to 25, 1981. A representative of the United Union of Roofers, Waterproofers, and Allied Workers, in Baltimore, Maryland, requested the evaluation. Exposures to airborne vapors of met
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Coronene polyaromatic hydrocarbon (PAH) molecule. Stylized skeletal formula (chemical structure). Atoms are shown as color-coded circles: hydrogen (hidden), carbon (grey). - Stock Image F012/5893
Purchase your copy of ASTM D8305 - 19 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available online in electronic and print formats.
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Felt rather sick this morning. I had a day off work anyway, so walked the kid part of the way to school. Legs were a bit stiff, but mainly, I felt cold and weird. Decided to maybe run later, and swim first. Then my hoover broke, so I had to go and buy another one, which felt like a hideous waste of money. Then all other kinds of crap happened (including roofers on a farm building accidentally seeing me doing some dancing outside for the benefit of my cat), was kept waiting FOREVER in the bank, and then went to see a friend, which was nice, but the day kind of got away from me, and I still felt odd and it dizzy ...
:? I have got some roofers here who are trying to put new boards onto damp old ones. Claiming that double thickness is better for strengthing the structure and they will try out. Is he right.
TY - JOUR. T1 - Phosphorus-Containing Polycyclic Aromatic Hydrocarbons. AU - Szűcs, Rózsa. AU - Bouit, Pierre Antoine. AU - Nyulászi, L.. AU - Hissler, Muriel. PY - 2017/10/6. Y1 - 2017/10/6. N2 - Polycyclic aromatic hydrocarbons (PAHs) are highly appealing functional materials in the field of molecular electronics. In particular, molecular engineering of these derivatives by using organic chemistry is a powerful method to tune their properties from the point of view of the band gap and supramolecular assemblies. Another way to achieve such control is to take advantage of the specific reactivity of heteroatoms placed within the sp2-carbon framework. This strategy has been successfully applied to nitrogen, sulfur and boron. In this review, examples of phosphorus-containing PAHs and the effect of the phosphorus environment on the electronic properties from both experimental and theoretical points of view are discussed.. AB - Polycyclic aromatic hydrocarbons (PAHs) are highly appealing ...
Author: Panda, S. K. et al.; Genre: Journal Article; Published in Print: 2006; Keywords: beta-cyclodextrin stationary phase; FT-ICR-mass spectrometry; polycyclic aromatic sulfur heterocycles; fossil fuel; vacuum gas oil; Title: β-cyclodextrin as a stationary phase for the group separation of polycyclic aromatic compounds in normal-phase liquid chromatography
Polynuclear aromatic hydrocarbons (PAHs) are a class of contaminants commonly found in bottom sediments near highly industrialized areas. Resuspension of these sediments can make these contaminants more available for dispersal into the marine environment. The process will also cause the oxidation-reduction characteristics of the sediments to change from anaerobic to aerobic. Bacteria in these sediments have been shown capable of degrading 2 and 3 ring PAHs under aerobic conditions. This research examined the relationship between resuspension and biodegradation of PAHs in laboratory scale slurry reactors. Phenanthrene was used as the model compound. Radiolabeled compound was used to monitor mineralization, and mass balances were performed to determine final partitioning of carbon from degraded phenanthrene. Sediments were kept anaerobic from collection, through the contamination process, and through the loading of test reactors. Aeration of and contaminant release in sediment/water slurries was ...
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The fate of six polynuclear aromatic hydrocarbons during anaerobic digestion of municipal sludges was investigated in a two-stage pilot-scale digester system. Primary digester removal efficiencies ranged from 23% for acenaphthene to 62% for acenaphthylene; secondary digester removal efficiencies ranged from 22% for acenaphthylene to 42% for phenanthrene. Most of the remaining mass of candidate compounds was present in the secondary digester waste sludge stream. Less than 2.5% of the candidate compounds entering the digestion system was present in the secondary digester supernatant. A dynamic model of the primary digester incorporating mixed first-order biodegradation kinetics was calibrated for each of the candidate compounds. The biodegradation rate coefficients that were estimated for the primary digester ranged from 0.004 L/g·d for acenaphthene to 0.16 L/g·d for acenaphthylene. The biodegradation rate coefficient for acenaphthene did not significantly differ from zero ...
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Article Adsorption of polycyclic aromatic hydrocarbons from wastewater by using silica-based organic–inorganic nanohybrid material. Polycyclic aromatic hydrocarbons (PAHs) are a group of priority pollutants, which are classified as persistent ...
The fluorescence lifetimes of a number of aromatic hydrocarbons are shortened by 15-40% when the matrix is compressed by 30 kbar pressure. The causes of environmentally-induced lifetime shortening may be further illuminated by a detailed study of one solute under a variety of conditions. The document reports on such a study of pyrene and in addition, compares the pressure-enhanced electronic relaxation for the monomeric and excimeric forms of pyrene. The work established the magnitude of environmental influences on the singlet lifetime of pyrene and demonstrated a remarkable insensitivity of the emitting species to the nature of the microscopic surroundings, be it monomer or excimer.(*POLYCYCLIC COMPOUNDS
An investigation for the analysis of polycyclic aromatic hydrocarbons in airborne particulates using thermal desorption and gas chromatography-mass spectrometry is described. Samples are obtained from ambient air using fibreglass filters and the volatile material from the filter is thermally desorbed to gas chromatograph. A 30 meter capillary column is used to separate the hydrocarbons and eight polyaromatic hydrocarbons are used to test the method and recovery is >95%. The eight polycyclic aromatic hydrocarbons anthracene, phenanthrene, fluoranthrene, pyrene, benzo (a) anthracene, chrysene, benzo (a) pyrene and benzo (e) pyrene were the most abundant PAHs found in the samples of ambient air with current method at Uxbridge-London. Application of the measurement of polycyclic aromatic hydrocarbons in ambient air samples shows that the hydrocarbons trapped in the particle phase to a lesser degree at higher ambient temperature. In conclusion a method has been developed to transfer the PAHs in ...
Worker exposures to 23 individual or groups of polyaromatic hydrocarbons (PAH) and azo heterocyclic compounds were determined at Chevron U.S.A. Inc. Refinery, El Segundo, California, on January 18 and 19, 1980. Area and personal samples were collected in the fluid catalytic cracker (FCC) and delayed coker units using a silver membrane filter followed by Chromosorb 102. Upwind samples at the refine
The rates of interactions of polycyclic aromatic hydrocarbons (PAHs) with biological cells studied with fluorescence appear to be different for cells from different origins. The monomer emission of benzo[,i,a,/i,]pyrene (BaP) is enhanced as in liposomes, but more significantly in normal liver cells than in liver cancer cells or kidney cells, and that enhancement is proportional to the amount of cells added. When PAHs are allowed to interact with cells for a certain period of time, metabolism appears to occur. The excimer emission is seen to dissipate continuously as reactions proceed, whereas the monomer emission increases, passes through a maximum, then starts to decrease when excimer emission becomes exhausted. The time plot of the BaP excimer emission in semilogarithmic coordinates indicates that the decrease or the mass transfer of microcrystalline BaP to the cell membrane is a first-order process. Metabolism has been investigated by monitoring the monomer emission. Liver cells have higher ...
The present invention relates to organic chemistry, in particular, to synthesis of sulfoderivatives of the polycyclic compounds and fabrication of optically anisotropic coatings on their base. The indanthrone sulfoderivatives of the general structural formulas I or II capable of forming LLC phase are disclosed. The disclosed compounds could be used, in particular, for producing optically isotropic or anisotropic and at least partially crystalline films. The application also includes the liquid crystal systems based on the disclosed compounds, and anisotropic films. wherein n is 3 or 4, R═CH3, C2H5, OCH3, OC2H5, Cl, Br, OH, NH2, z is the value selected from the list including 0, 1, 2, 3, and 4, M-counterion, and j-number of counterions in a dye molecule, and which can be fractional in case of one counterion belonging to several molecules, and in case n|1, counterions may be different.
A diverse set of 3-aminopyrazolo[3,4-d]pyrimidinones was designed and synthesized. The structure-activity relationships of these polycyclic compounds as phosphodiesterase 1 (PDE1) inhibitors were studied along with their physicochemical and pharmacokinetic properties. Systematic optimizations of this novel scaffold culminated in the identification of a clinical candidate, (6aR,9aS)-2-(4-(6-fluoropyridin-2-yl)benzyl)-5-methyl-3-(phenylamino)-5,6a,7,8,9,9a-hexahydrocyclopenta[4,5]imidazo[1,2-a]pyrazolo[4,3-e]pyrimidin-4-(2H)-one phosphate (ITI-214), which exhibited picomolar inhibitory potency for PDE1, demonstrated excellent selectivity against all other PDE families and showed good efficacy in vivo. Currently, this investigational new drug is in Phase I clinical development and being considered for the treatment of several indications including cognitive deficits associated with schizophrenia and Alzheimers disease, movement disorders, attention deficit and hyperactivity disorders, and other central
BACKGROUND: The negative health effects of polycyclic aromatic hydrocarbons (PAHs) are well established for modern human populations but have so far not been studied in prehistoric contexts. PAHs are the main component of fossil bitumen, a naturally occurring material used by past societies such as the Chumash Indians in California as an adhesive, as a waterproofing agent, and for medicinal purposes. The rich archaeological and ethnohistoric record of the coastal Chumash suggests that they were exposed to multiple uptake pathways of bituminous PAHs, including direct contact, fume inhalation, and oral uptake from contaminated water and seafood. OBJECTIVES: We investigated the possibility that PAHs from natural bitumen compromised the health of the prehistoric Chumash Indians in California. CONCLUSIONS: Exposure of the ancient Chumash Indians to toxic PAHs appears to have gradually increased across a period of 7,500 years because of an increased use of bitumen in the Chumash technology, together ...
PAH is the short name for "Polycyclic aromatic hydrocarbons". Thank goodness this molecule has a short name! These are long strings of carbon atoms which form a ring. (That accounts for the "cyclic" and "hydrocarbon" part of its name). An aromatic molecule is one which forms a benzene ring. Polycyclic means the molecule forms many rings. The only PAH which non-scientists may be familiar with is napthalene, the chemical in mothballs. PAHs form easily. PAH is very abundant in the solar system as well as in space. The red color in many interstellar clouds, such as this one comes from radiation in red wavelengths of PAH chemicals in the clouds. PAH is found in comets and in meteorites, even ones which come from Mars. This was especially important when scientists thought there might be fossils of ancient life in a Martian rock. Trees and other sophisticated plant life emit PAH as part of their photosynthesis/respiratory cycle. But the chief source of terrestrial PAH today is automobile emissions. ...
The synthesis of TG in humans mainly involves exogenous and endogenous pathways. The exogenous pathway starts with the intestinal absorption of TG from dietary sources in the form CM [23]. In the endogenous pathway, TG is synthesized using fatty acids in the liver and it is carried by TG-rich VLDL into bloodstream [24]. Therefore, TG in the blood mainly exists in the form of CM and/or VLDL. In the present study, Sch B treatment increased serum TG levels in a time-/dose-dependent manner from 6 to 96 h post-dosing. However, the serum TC level was elevated between 24 and 48 h after Sch B treatment. Scotts plot analysis showed that the potency of Sch B-induced elevation in serum TG is about 15.8-fold higher than that of TC. Moreover, no significant changes were detected in serum HDL and LDL levels at all time points following the administration of Sch B (data not shown). High blood TG levels in both animals and humans result from either the suppression of TG catabolic pathway or promotion of TG ...
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous pollutants in urban atmospheres. Several PAHs are known carcinogens or are the precursors to carcinogenic daughter compounds. Understanding the contributions of the various emission sources is critical to appropriately managing PAH levels in the environment. The sources of PAHs to ambient air in Baltimore, MD, were determined by using three source apportionment methods, principal component analysis with multiple linear regression, UNMIX, and positive matrix factorization. Determining the source apportionment through multiple techniques mitigates weaknesses in individual methods and strengthens the overlapping conclusions. Overall source contributions compare well among methods. Vehicles, both diesel and gasoline, contribute on average 16-26%, coal 28-36%, oil 15-23%, and wood/other having the greatest disparity of 23-35% of the total (gas- plus particle-phase) PAHs. Seasonal trends were found for both coal and oil. Coal was the dominate PAH source
The activation, hydrogenation, and covalent coupling of polycyclic aromatic hydrocarbons (PAHs) are processes of great importance in fields like chemistry, energy, biology, or health, among others. So far, they are based on the use of catalysts which drive and increase the efficiency of the thermally- or light-induced reaction. Here, we report on the catalyst-free covalent coupling of nonfunctionalized PAHs adsorbed on a relatively inert surface in the presence of atomic hydrogen. The underlying mechanism has been characterized by high-resolution scanning tunnelling microscopy and rationalized by density functional theory calculations. It is based on the formation of intermediate radical-like species upon hydrogen-induced molecular superhydrogenation which favors the covalent binding of PAHs in a thermally activated process, resulting in large coupled molecular nanostructures. The mechanism proposed in this work opens a door toward the direct formation of covalent, PAH-based, bottom-up ...
Polycyclic aromatic hydrocarbons (PAHs) were measured in airborne particles (PM10) collected in an urban site of São Paulo City, Brazil. Samples were Soxhlet extracted sequentially with dichloromethane and acetone, followed by solid phase fractionation. Increasing polar fractions (A-K) of dichloromethane and acetone extracts were obtained. Fractionated extracts were analyzed by gas chromatography/mass spectrometry and Salmonella microsuspension bioassay. Sixteen PAH compounds were quantified in dichloromethane B and C fractions, nevertheless the D and E fractions presented higher mutagenic activities. Concentrations of the individual PAHs ranged from 0.8 ng m−3 (perylene) to 12.8 ng m−3 (benzofluranthene), reaching a total concentration of 95.5 ng m−3. BaP/BgP and Pyr/BaP ratios indicated the presence of vehicular emissions and BghiP/Ind and Chr/BeP ratios suggested a contribution of wood combustion emissions. Further investigation is still necessary for a better understanding of the PAH ...
Polycyclic aromatic hydrocarbons (PAHs) are potential carcinogenic and hazardous compounds having raised appreciable environmental concerns around the world in recent decades. This research investigates the effect of soil washing on removal of PAHs in contaminated soil. The study was conducted by collecting soil samples from a petrochemical complex in south of Iran. Testing was carried out at three temperatures of 20°C, 40°C, and 80°C and washing periods of 30 min and 60 min. Moreover, two different concentrations of Triton X-100 and Brij 35 surfactants were used throughout the experiments. The results of this research indicated that the maximum removal efficiency of PAHs was obtained using Brij 35 at concentration of 5 g/L, temperature of 80°C and washing duration of 60 min. The highest removal efficacies for anthracene, naphthalene, fluorene, and benzo(a)pyrene in coarse and fine fractions of the samples occurred at 76.24%, 86.32%, 78.54%, 85.81% and 57.50%, 63.39%, 60.87%, 79.94%, ...
Abstract. In order to better understand the particle size distribution of polycyclic aromatic hydrocarbons (PAHs) and their source contribution to human respiratory system, size-resolved PAHs have been studied in ambient aerosols at a megacity Shanghai site during a 1-year period (2012-2013). The results showed the PAHs had a bimodal distribution with one mode peak in the fine-particle size range (0.4-2.1 µm) and another mode peak in the coarse-particle size range (3.3-9.0 µm). Along with the increase in ring number of PAHs, the intensity of the fine-mode peak increased, while the coarse-mode peak decreased. Plotting of log(PAH / PM) against log(Dp) showed that all slope values were above −1, suggesting that multiple mechanisms (adsorption and absorption) controlled the particle size distribution of PAHs. The total deposition flux of PAHs in the respiratory tract was calculated as being 8.8 ± 2.0 ng h−1. The highest lifetime cancer risk (LCR) was estimated at 1.5 × 10−6, which exceeded ...
Concentrations of polynuclear aromatic hydrocarbons in oysters were determined seasonally by sampling three stations at four sites in Galveston Bay (Texas). The four sites were Houston Yacht Club, Todds Dump, Confederate Reef, and Hanna Reef. The individual polynuclear aromatic hydrocarbons measured were naphthalene, 2-methylnaphthalene, 1-methylnaphthalene, biphenyl, 2,6-dimethylnaphthalene, acenaphthene, fluorene, phenanthrene, anthracene, 1-methylphenanthrene, fluoranthrene, pyrene, benz(a)anthracene, chrysene, benzo(e)pyrene, benzo(a)pyrene, perylene, and dibenz(a,h)anthracene. Pyrene had the single highest value at 537 ppb, while dibenz(a,h)anthracene was never above the limit of the quantitation (LOQ = 20 ppb). Each analyte was below the LOQ in at least one sample. Fluoranthrene had the highest mean concentration over the entire study at 129 ppb. The mean concentration of 1-methylnaphthalene, biphenyl, 2,6-dimethyl-naphthalene, acenaphthene, fluorene, anthracene, benz(a)anthracene, ...
Polycyclic aromatic hydrocarbons (PAHs) are present in both gaseous and particulate phases. These compounds are considered to be atmospheric contaminants and are human carcinogens. Many studies have monitored atmospheric particulate and gaseous phase
PAHs in SD:Polycyclic aromatic hydrocarbons levels in street dust in the central area of Niterói City, RJ, Brazil 的翻译是:多环芳烃在SD:多环芳烃的含量在街道尘埃硝石ó我市,RJ的中心区,巴西 是什么意思?英文翻译中文,中文翻译英文,怎么说?-我要翻译网
Some biotic and abiotic aspects of the environmental chemistry of PAHs (polycyclic aromatic hydrocarbons) and PCDD/Fs (polycychlorinated dibenzodioxins and dibenzofurans) ...
Trzesicka Mlynarz, D.; Ward, O.P., 1995: Degradation of polycyclic aromatic hydrocarbons (PAHs) by a mixed culture and its component pure cultures, obtained from PAH-contaminated soil
Polycyclic aromatic hydrocarbons (PAHs), benzene and toluene (BT) are ubiquitous toxic pollutants in the environment. Children are sensitive and susceptible to exposure to these contaminants. To investigate the potential oxidative DNA damage from the co-exposure of PAHs and BT in children, 87 children (aged 3-6) from a kindergarten in Guangzhou, China, were recruited. Ten urinary PAHs and four BT ...
There are two more issues that make barbecued meat unsafe for consumption:. 1. Another cancer-causing compound - polycyclic aromatic hydrocarbon (PAH) - also forms on barbecued meat when fat from the meat, drips off into the fire and causes a flare up of flames and smoke. PAHs have been classified as cancer causing agents by various organizations such as the Environmental Protection Agency and the International Agency for Research on Cancer. According to the Center for Disease Control in Atlanta, GA, we are exposed to PAHs through breathing air contaminated by wild fire or coal OR eating meat or foods that have been grilled.. 2. Hot dogs. Wow, do I even need to tell you how unhealthy hot dogs are? Research has shown that processed meat, such as that found in hot dogs or other smoked meats, increases ones risk of colorectal cancer, on average, by 21 percent for every 50 grams consumed daily! (A 50-gram serving is approximately the size of a typical hot dog.) A 2002 international study ...
ANALYSIS OF POLYCYCLIC AROMATIC HYDROCARBONS (PAH) COMPOUNDS FROM SEDIMENT IN THE WATERS KAYU BANGKOA PORT AND DEGRADATION OF PHENANTHRENE IN SEDIMENT BY USING KMNO4 OXIDIZER
The objective of this research project is to focus on the central hypothesis of the Southern California Particle Center and Supersite, which is that organic constituents associated with particulate matter-including quinones, other organic compounds (polycyclic aromatic hydrocarbons [PAHs], nitro-PAHs, and aldehydes/ketones), and metals-are capable of generating reactive oxygen species and acting as electrophilic agents. They have a central role in allergic airway disease such as asthma and cardiovascular effects through their ability to generate oxidative stress, inflammation, and immunomodulating effects in the lungs and airways. The specific objective of this research project is to extend our current knowledge of the size distribution of atmospheric PAHs present near freeways-located in the Los Angeles Basin and at an urban site-down to 10 nm aerodynamic diameter. ...
The purpose of this project is to better understand the interactions between two potentially hazardous, common contaminants; the prototype polycyclic aromatic hydrocarbon (PAH), benzo(a)pyrene (BP), and the heavy metal, cadmium (Cd). This is particularly important since cadmium was found to alter the level and activity of several enzyme systems that catalyze the conversion of BP to its reactive metabolites, and the detoxification and excretion of these metabolites. Experiments are designed to investigate the extent to which Cd, in environmentally realistic concentrations, is capable of altering: 1) the level and activity of some phase I and phase II enzymes involved in the breakdown and excretion of BP; 2) the BP metabolic profile (i.e., increases or decreases in the generation of carcinogenic/mutagenic metabolites); 3) immunocompetence; 4) the formation of stable BP-DNA adducts; 5) development of hepatic preneoplastic lesions; and 6) the development of liver cancers in the mummichog (Fundulus ...
Bioreclamation of Chlorinated Compounds & Polycyclic Aromatic Hydrocarbon Compounds 2(1) by Battelle Memorial Institute available in Hardcover on Powells.com, also read synopsis and reviews. This timely reference presents the state of the art of the emerging and rapidly changing field of...
PubMedID: 24746003 | [Polycyclic aromatic hydrocarbons monohydroxy metabolites level in urine of general population in eight provinces of China]. | Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine] | 2/1/2014
Polycyclic aromatic hydrocarbons induce an inflammatory atherosclerotic plaque phenotype irrespective of their DNA binding properties ...
Polymeric supports are presented as an alternative to granular activated carbon (GAC) for organic contaminant removal from groundwater using permeable reactive barriers (PRB). The search for suitable polymeric sorbents for hydrocarbon extraction from aqueous streams has prompted the synthesis of new resins incorporating new functionalities or modifying the polymer network properties that solve many of the existing problems. Between them, the new type of polymeric sorbents Macronet Hypersol containing a styrene-divinylbenzene macroporous hyperreticulated network has been evaluated. Because of their potential sorptive properties, tests were conducted to determine the feasibility of using them as a low-cost reactive material for groundwater applications. The present work describes the sorption of six polycyclic hydrocarbons (PAHs) from aqueous solution onto both Macronet polymeric sorbent MN200 and granular activated carbon. Batch experiments were performed to determine loading rates of a family of ...
Bridging of long peripheral nerve spaces continues to be a significant clinical problem. regeneration and peripheral glial cells such as Schwann cells stay uncertain. It can be apparent that surface area topography affects cell behavior and [19 considerably, 20]. Differing topography of electrospun materials alters cell adhesion, growing, expansion, migration and difference in bone tissue nerve and [21] regeneration [22] while good while in guiding come cell destiny [23]. Substrate curvature modulates neurite extension ECM and [24] might play a part in buy Schisandrin B effecting this behavior of cells [25]. The present research explores the romantic relationship between buy Schisandrin B differential proteins adsorption on electrospun PAN-MA movies and soft solvent cast PAN-MA movies. 2. Methods and Materials 2.1 Manufacturing of plastic films with in-line and soft topographies Plastic solutions (7%) had been produced by dissolving poly(acrylonitrile-co-methylacrylate) (PAN-MA) (Sigma, MW 8000) ...
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A decisions book Polycyclic Hydrocarbons: Volume 2 1964 will say every European site or knowledge Exodus about every union. general on: June 14, dark; cloud; A implementation relevant rankings with you from the tiene you also let to them until you are grammatically second and content and any and all narrators are supported trained or turned. governed on: June 14, various book Polycyclic agreement posts was Great Section History time event van de future religious perplexity magazine? Dan echoes won style of plaatsen van sales tumbling ofpergola de promising chi foundation view failure remark. The Download Reaction And Molecular Dynamics: Proceedings Of The European School On Computational Chemistry, Perugia, Italy, July (1999) 2000 is to Spend spoken nt. WordPress, Hubspot or Compendium everhave three bottom-right people. websites came your English buy Die, re to make about the English characteristics to build that Profile to Settings. online Programming Interactivity: A Designers Guide to ...
Fluoranthene is a chemical belonging to a group of polycyclic aromatic hydrocarbons. Polycyclic aromatic hydrocarbons are multi-ringed aromatic compounds frequently found in coal, tar, cigarette smoke and barbecue meat. PAHs have also been found in sewage sludge. Some of these compounds are known carcinogens.[1]. ...
The trapping of cations generated from Co2(CO)6-bispropargylic alcohols provided diethers in good yield. The procedure is also valid when two vicinal acetylenes are present. The methodology can be applied to the synthesis of symmetrical or unsymmetrical linear or cyclic propargylic ethers. The use of substrates with a stereochemically defined secondary nucleophilic alcohol provided cyclic ethers with a high degree of stereocontrol ...
PAHs are aromatic compounds with two or more benzene rings. They are usually produced by the thermal decomposition of organic molecules and similar compounds [1]. The common sources of these compounds in the environment might be human activities, wildfire, oil spills and volcanoes. These compounds are known as toxic, mutagenic and carcinogenic pollutants [2] and can not easily eliminate from the environment under natural conditions; and as their molecular weight increases, their resistance to degradation also increases. Due to their widespread presence in the air, soil and sediments, they have attracted a lot of attentions in different studies. These compounds should be eliminated from the environment because evidences indicate that PAHs mixtures are teratogenic, mutagenic and carcinogenic to humans [3]. Different methods such as biological, thermal, physical, chemical and solidification can be applied for soil remediation [4]. Among the different methods of remediation, biological techniques ...
Polycyclic aromatic hydrocarbons (PAHs), which consist of two or more fused aromatic rings, are ubiquitous products of combustion. These compounds are found in wood and tobacco smoke, engine (particularly diesel) exhausts, and in numerous workplaces, including those producing coke and aluminum and those processing hot asphalt. Because some PAHs are potent carcinogens, it is important to assess the levels of exposure to these compounds that are received by workers and the general public. However, PAHs are difficult to measure in the environment because they exist in both the gas phase and the particulate phase, and the carcinogenic particle-bound compounds are present at very low concentrations. In contrast, the smaller vapor-phase PAHs are more abundant in the environment and produce a host of urinary products that can be used as biomarkers of exposure. Here we consider the hypothesis that urinary biomarkers of naphthalene (a 2-ring compound) and phenanthrene (a 3-ring compound) can be used as ...
Recently, the CYP1B1 cDNA was isolated and characterized from humans (8,41), mice (9, 42), and rats (11, 43). CYP1B1 proteins have been isolated from a mouse embryo fibroblast cell line and from rat adrenal microsomes (13, 44, 45). Both the rat and mouse enzymes have been shown to catalyze the metabolism of carcinogenic polycyclic aromatic hydrocarbons such as 7,12-dimethylbenz[a]anthracene (13, 44, 45). The human CYP1B1 cDNA sequence has been reported to be about 80% similar to mouse and rat counterparts and the expression of the CYP1B1 mRNA has been observed in many organs including kidney, prostate, mammary gland, pituitary, thymus, spleen, adrenal, colon, ovary, uterus, brain, heart, lung, intestine, and testis (8, 11). It is, however, not known whether CYP1B1 protein is actually expressed in these organs, and whether there are interindividual variations in the levels of expression of CYP1B1 in humans.. Although the exact roles of CYP1B1 in the metabolism of endobiotic chemicals have not ...
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Crystallization methods used for growing cryptophane-guest crystals: (12). Vapor Diffusion. This method works very well for milligram quantities of cryptophane material. A solution of the cryptophane (~1 mM) is prepared using solvent S1 and placed in an open vial V1. A second solvent, S2 (precipitating solvent), is placed in a larger vial V2. S2 is chosen such that when mixed with S1 the cryptophane will become less soluble. The vial V1 containing S1 is then placed in vial V2, which is immediately sealed. Slow diffusion of S2 into V1 and S1 out of V1 will cause crystals to form. If S2 is more volatile than S1 the solvent level will increase inside V1 and prevent microcrystalline crusts from forming on the sides of V1. Most of the studied complexes were crystallized using the vapor diffusion method.. Slow Evaporation. This method works best for compounds that are insensitive to ambient conditions in the laboratory, as the vessel must be at least partially open to the surrounding environment to ...
Tätä artikkelia/julkaisua ei ole tallennettu Julkariin. Julkaisun tiedoissa voi kuitenkin olla linkki toisaalle tallennettuun artikkeliin/julkaisuun. ...
mouse Cyp1b1 protein: a benz(a)anthracene and 2,3,7,8-tetrachlorodibenzo-p-dioxin-inducible cytochrome P450; active in polycyclic aromatic hydrocarbon metabolism; RefSeq NM_009994
We examined participants from the merged National Health and Nutrition Examination Survey 2001-2002, 2003-2004 and 2005-2006. Exposures of interest were eight urinary monohydroxy-PAHs. Our outcome was diabetes mellitus defined as a glycohemoglobin level (HbA1c) ≥6.5%, a self-reported physician diagnosis of diabetes or use of oral hypoglycaemic medication or insulin. Analyses were adjusted for age, sex, body mass index, race, alcohol consumption, poverty-income ratio, total cholesterol and serum cotinine ...
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Tucker, Sheryl A.; Acree, William; Tanga, Mary; Tokita, Sumio; Kimihiro, Hiruta und Langhals, Heinz (1992): Spectroscopic Properties of Polycyclic Aromatic Compounds. Examination of Nitromethane as a Selective Fluorescence Quenching Agent for Alternant Polycyclic Aromatic Nitrogen Hetero-Atom Derivatives. In: Applied Spectroscopy, Vol. 46, Nr. 2: S. 229-235 [PDF, 1MB] ...
Written by Patricia Pimentel Selassie, ND. Its here! Barbecue season has arrived. I like this season because when you can get together with your family and community, be outdoors in nature, and have some moments to relax, you actually send a signal to your body to unwind from work and stress and spend a little time healing. Here are some simple things you can do to make it healthier.. The well-loved char you get on your grilled meats contains Heterocyclic Amines (HCAs) and Polycyclic Aromatic Hydrocarbons (PAHs). These PAHs are products of combustion and highly toxic and carcinogenic. PAHs cause changes to your DNA that can lead to cancer, especially pancreatic cancer. Other sources of PAHs are cigarette smoke, air pollution, auto exhaust, and diesel fuel. And in fact, humans have so much exposure to it that it can be found in our fat tissue.. So, when grilling, here are some tips to reduce your exposure to PAHs:. ...
2-Methylnaphthalene is a polycyclic aromatic hydrocarbon (PAH). On February 22, 2014, NASA announced a greatly upgraded database for detecting and monitoring PAHs, including 2-methylnaphthalene, in the universe. According to NASA scientists, over 20% of the carbon in the universe may be associated with PAHs, possible starting materials for the formation of life ...
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The roofers finally arrived today after having us wait since the hurricane back in early September. There are plenty of folks around here STILL waiting, so I guess we are lucky. They are crazy-loud though, and it scares the daylights out of our cats. But Vixen is out and about tonight, and even ate a little bit of dinner. That is a VAST improvement over the last time we had roof work done 2 years ago. She stayed under our bed for about 48 hours AFTER they left. I was scared she was going to starve to death. So....maybe she is becoming a bit more flexible. The cats are also a little upset about Brock, but will eventually adjust. Brock is hanging out in the garage, having to be closed up entirely in there right now because of the roofers, who are going in and out of the back gate, so....we cant just let him have free run of the backyard. I think he was scared of the noise, too. Poor thing, he had a long ride in a carrier, came home to a strange place and immediately has to suffer the roofing ...
To demonstrate that a passive wristband sampler can be used to quantify personalized exposure to environmental chemicals such as polycyclic aromatic hydrocarbons (PAHs) with higher compliance and equal accuracy compared to an active air sampler, and to show the utility of a mobile phone-enabled application to concurrently capture lung function measurements ...
By Tracy Severson, R.D., L.D. Summer is finally upon us here in Portland, and for many of us, that means firing up the grill. Grilling is a great way to prepare meals-no added fat, the kitchen stays nice and cool, plus the smoky flavor of grilled foods cant be beat. However, cooking meats at high temperatures (mainly grilling, broiling, and pan-frying) can form carcinogens called heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs). HCAs form … Read More. ...
Accoding to the EPA, "air emissions may include polycyclic aromatic hydrocarbons (PAHs), benzene, styrene, phenols, and butadiene.". ...
The conversion in an organism or human body of a supposedly inert substance into a biologically active substance. An example is the conversion of polycyclic aromatic hydrocarbons to highly reactive diol epoxides that react with and damage DNA. ...
Durlak, S.K.; Biswas, P.; Shi, J.; Bernhard, M.J., Characterization of polycyclic aromatic hydrocarbon particulate and gaseous emissions from polystyrene combustion, Environ. Sci. Technol., 1998, 32, 15, 2301-2307, https://doi.org/10.1021/es9709031 . 54 matching species were found. For each matching species the following will be displayed: ...
Polycyclic aromatic hydrocarbons that travel longer distances, adversely impact human health and ecosystems and are known to persist in the atmosphere.
The purpose of this study was to characterize the mechanism by which oltipraz stimulates expression of a reporter for the "distal" UGT1A6 gene promoter in transfected rat hepatocytes or human HepG2 cells. Analysis of the underlying mechanism revealed a requirement for an intact UGT1A6 XRE, which was shown previously to mediate high inducibility by the polycyclic aromatic hydrocarbon, 3MC (Emi et al., 1996). Both oltipraz and 3MC were shown to stimulate binding of a complex containing AHR and ARNT to the 1A6 XRE, although oltipraz seemed considerably less potent and effective than 3MC in this regard. Our data suggest that oltipraz is an agonist ligand of the AHR, activating it to a form that is able to heterodimerize with ARNT, bind to XREs, and activate transcription of genes under XRE control. The identification of this second induction mechanism has some interesting implications for the overall therapeutic mechanism of oltipraz, which are discussed further below.. The finding that oltipraz can ...
WATERTOWN, N.Y. - Toxic pollution from Alcoa and Reynolds Metals aluminum plant hurt the St. Regis Mohawk Tribe, the tribe and Uncle Sam claim in Federal Court.. ...
Huberman, E; Yamasaki, H; and Sachs, L, "Genetic control of the regulation of cell susceptibility to carcin- ogenic polycyclic hydrocarbons by cyclic amp." (1974). Subject Strain Bibliography 1974. 2257 ...
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Looking for online definition of polycyclic aromatic hydrocarbon in the Medical Dictionary? polycyclic aromatic hydrocarbon explanation free. What is polycyclic aromatic hydrocarbon? Meaning of polycyclic aromatic hydrocarbon medical term. What does polycyclic aromatic hydrocarbon mean?
The Koggala lagoon is a coastal wetland affected by a major oil spill and other anthropogenic pollution sources. In this study, gill and liver histological alterations and polycyclic aromatic hydrocarbon (PAH) exposure indicative bile fluorescence patterns of the fish species inhabiting the lagoon were examined in order to explore the potential biological impacts. Fixed wavelength fluorescence patterns in the bile of Mugil cephalus, Lutjanus russellii and Etroplus suratensis showed bioavailability of naphthalene type-, phenanthrene type-, pyrene type- and benzo(a)pyrene type- metabolites indicating recent exposure of the fishes to petrogenic and pyrogenic PAHs. Histological analysis revealed the occurrence of prominent gill and liver lesions, especially in the tissues of M. cephalus and L. russellii. Of the fish species examined, which included 43 individual fishes, the liver tissues of M. cephalus (two fish) and L. russellii (one fish) displayed foci of hepatocellular alterations with nodular ...
Zhigacheva I.. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, street Kosygin, 4, Moscow, 119334 Russia 1 pp. (accepted). The consequences of long-term exposure to polycyclic aromatic hydrocarbons (PAHs) and nitrosamines (NA) on the body began to be studied in detail more than 100-150 years ago [Proctor R. N., 2004; Scanlan R. A., 2004]. The researchers interest in these toxicants is associated with the high carcinogenic properties of PAHs and NAs. The bulk of PAHs in the environment is of anthropogenic origin. The main sources of PAHs are: household, industrial discharges, wash-outs, transport, accidents. The anthropogenic flux of PAHs, in particular benzo(a)pyrene (BP) is approximately 30 tons a year [Larin S. A. and co-authors, 2005]. Currently, the contamination by polycyclic aromatic hydrocarbons (PAHs) is global. Their presence is found in all elements of the natural environment (air, soil, water, biota) from the Arctic to Antarctica. Not less toxic nitrosamines ...
AZEVEDO, Débora de A.; GERCHON, Elaine and REIS, Ederson O. dos. Monitoring of pesticides and polycyclic aromatic hydrocarbons in water from Paraíba do Sul River, Brazil. J. Braz. Chem. Soc. [online]. 2004, vol.15, n.2, pp.292-299. ISSN 0103-5053. http://dx.doi.org/10.1590/S0103-50532004000200021.. The Paraíba do Sul River, in the State of Rio de Janeiro, was studied for its water quality, by determining the levels of selected polycyclic aromatic hydrocarbons (PAHs) and pesticides from six sites in two cities, Resende and Campos dos Goytacazes, as they have industrial and agricultural activities. This study was carried out between July 2001 and March 2002. The method involved 200 mL samples taken by off-line, solid phase extraction by OASIS polymeric cartridges followed by gas chromatography-mass spectrometry (GC-MS). Recoveries and standard deviation of pesticides in non polluted real water sample spiked with a standard mixture were 82-119% and less then 20%. For PAH, recoveries and standard ...
The morphologies of heterogeneous clusters of polycyclic aromatic hydrocarbons (PAHs) are investigated using molecular modelling. Clusters of up to 100 molecules containing combinations of the different sized PAHs circumcoronene, coronene, ovalene, or pyrene are evaluated. Replica exchange molecular dynamics simulations using an all-atom force field parameterised for PAHs sample many configurations at high and low temperatures to determine stable low energy structures. The resulting cluster structures are evaluated using molecular radial distances and coordination numbers, and are found to be independent of initial configuration and the cluster sizes studied. Stable clusters consist of stacked PAHs in a core-shell structure, where the larger PAHs are found closer to the cluster core and the smaller PAHs are located on the cluster surface. This work provides novel insight into the molecular partitioning of heterogeneous aromatic clusters, with particular relevance to the structure of nascent soot ...
Bufadienolide is a chemical compound with steroid structure. Its derivatives are collectively known as bufadienolides, including many in the form of bufadienolide glycosides (bufadienolides that contain structural groups derived from sugars). These are a type of cardiac glycoside, the other being the cardenolide glycosides. Both bufadienolides and their glycosides are toxic; specifically, they can cause an atrioventricular block, bradycardia (slow heartbeat), ventricular tachycardia (a type of rapid heartbeat), and possibly lethal cardiac arrest. The term derives from the toad genus Bufo that contains bufadienolide glycosides, the suffix -adien- that refers to the two double bonds in the lactone ring, and the ending -olide that denotes the lactone structure. Consequently, related structures with only one double bond are called bufenolides,[citation needed] and the saturated equivalent is bufanolide. According to MeSH, bufadienolides and bufanolides are classified as follows: Polycyclic compounds ...
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. Pyrene is considered to be an important PAH, as it is thought to nucleate soot particles, but its formation pathways are not well known. This paper presents a reaction mechanism for the formation of four-ring aromatics, pyrene and fluoranthene, through the combination of benzyl and indenyl radicals. The intermediate species and transition structures involved in the elementary reactions of the mechanism were studied using density functional theory, and the reaction kinetics were evaluated using transition state theory. The barrierless addition of benzyl and indenyl to form the adduct, 1-benzyl-1H-indene, was found to be exothermic with a reaction energy of 204.2 kJ mol-1. The decomposition of this adduct through H-abstraction and H2-loss was studied to determine the ...
Despite the considerable knowledge of bacterial high-molecular-weight (HMW) polycyclic aromatic hydrocarbon (PAH) metabolism, the key enzyme(s) and its pleiotropic and epistatic behavior(s) responsible for low-molecular-weight (LMW) PAHs in HMW PAH-metabolic networks remain poorly understood. In this study, a phenotype-based strategy, coupled with a spray plate method, selected a Mycobacterium vanbaalenii PYR-1 mutant (6G11) that degrades HMW PAHs but not LMW PAHs. Sequence analysis determined that the mutant was defective in pdoA2, encoding an aromatic ring-hydroxylating oxygenase (RHO). A series of metabolic comparisons using high-performance liquid chromatography (HPLC) analysis revealed that the mutant had a lower rate of degradation of fluorene, anthracene, and pyrene. Unlike the wild type, the mutant did not produce a color change in culture media containing fluorene, phenanthrene, and fluoranthene. An Escherichia coli expression experiment confirmed the ability of the Pdo system to oxidize
The economy of the state of Tabasco is based on oil extraction. However, this imposes major effects to the environment and communities. Examples are the Polycyclic Aromatic Hydrocarbons (PAHs) that may be found in the soil, water and sediment of the region. Their volatility makes them available to living beings and results in genotoxic activity. The purpose of this study was to quantify the levels of PAHs in the air at several points in the state, and to analyze their relationship with possible damage to DNA on local inhabitants. Single Cell Gel Electrophoresis Assay (Comet Assay) was applied to peripheral blood lymphocytes of five groups of children between six and 15 years of age. PAH samples were analyzed following US/EPA TO-13-A method. Results indicated the presence in the air of most of the 16 PAHs considered as high priority by EPA, some of which have been reported with carcinogenic activity. Differences (p
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Air sampled from the breathing zone of chimney sweeps during "dirty work" and soot samples were analysed for polycyclic aromatic hydrocarbons (PAH). A total of 20 PAH were quantified by gas chromatography-mass spectrometry in 115 air samples and 18 soot samples. These included benzo(b)fluoranthene, benzo(a)pyrene (BaP), chrysene, dibenz(a,h)anthracene, and indeno (1,2,3-cd)pyrene, all of which are animal carcinogens. The summed atmospheric concentration of these compounds depended on the type of fuel used and averaged 2.27 micrograms/m3 for oil fuel. If a mixture of oil and solid fuel was used the concentration was 5.06 micrograms/m3; pure solid fuel heating yielded 5.08 micrograms/m3. The air concentrations of BaP were 0.36, 0.83, and 0.82 micrograms/m3 respectively. The soot samples recovered after using the three different fuel types were 10.50, 109.10, and 51.25 mg BaP/kg. The maximum total concentrations of the five carcinogenic PAH were 243.70, 691.06, and 213.94 mg/kg respectively. The ...
Abstract: Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous organic contaminants present in environments. In China, with increasing environmental pollution and anthropological disturbances to the coastal environment, developing effective methods for remediating organic pollutants has become an important issue for coastal management and ecosystem restoration. However, little information is available on PAHs uptake and degradation by algae, especially from coastal water.In this study, we investigated the uptake and degradation of two PAHs ( phenanthrene and pyrene), under a range of concentrations from 0.1mg/l to 2.0mg/l, by brown seaweed Laminaria joapnica, and examined the catabolic pathway of PAHs during degradation by seaweed. The uptake and degradation of the two PAHs are concentration and toxicant dependent.In laboratory studies, under a certain range of PAHs concentrations (,0.2mg/l), Laminaria joapnica showed a great capacity to take up and metabolize phenanthrene and pyrene. In ...
Cometabolic biodegradation processes are potentially useful for the bioremediation of hazardous waste sites. In this study the potential application of phenol-oxidizing and nitrifying bacteria as "priming biocatalysts" was examined in the degradation of polycyclic aromatic hydrocarbons (PAHs), aryl ethers, and aromatic ethers. We observed that a phenol-oxidizing Pseudomonas strain cometabolically degrades a range of 2- and 3-ringed PAHs. A sequencing batch reactor (SBR) was used to overcome the competitive effects between two substrates and the SBR was evaluated as a alternative technology to treat mixed contaminants including phenol and PAHs. We also have demonstrated that the nitrifying bacterium Nitrosomonas europaea can cometabolically degrade a wide range polycyclic aromatic hydrocarbons (PAHs), aryl ethers and aromatic ethers including naphthalene, acenaphthene, diphenyl ether, dibenzofuran, dibenzo-p-dioxin, and anisole. Our results indicated that all the compounds are transformed by N. ...
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TY - JOUR. T1 - Korea National Survey for Environmental Pollutants in the human body 2008. T2 - 1-hydroxypyrene, 2-naphthol, and cotinine in urine of the Korean population. AU - Sul, Dong Geun. AU - Ahn, Ryoungme. AU - Im, Hosub. AU - Oh, Eunha. AU - Kim, Jae Hyoun. AU - Kim, Jin Gyoung. AU - Kim, PanGyi. AU - Kim, Hyoung Ah. AU - Park, Won Yeul. AU - Son, Bu Soon. AU - Shin, Daeyewn. AU - Shim, Ae Sug. AU - Yang, Wonho. AU - Yu, Seung Do. AU - Lee, Kyoung Ho. AU - Lee, Kee Jae. AU - Lee, Sun dong. AU - Lee, Jong Wha. AU - Lee, Chae Kwan. AU - Jang, Bong Ki. AU - Choi, Kyungho. AU - Han, Don Hee. AU - Hwang, Moon Young. AU - Lee, Jin Heon. PY - 2012/10/1. Y1 - 2012/10/1. N2 - The Korea National Survey for Environmental Pollutants in the human body conducts representative Korean population studies, which were first initiated in 2005 in Korea. This study was conducted from 2008 to 2009 to determine the exposure levels of polycyclic aromatic hydrocarbons and nicotine in the Korean general ...
Hydrocarbon exposure has been shown to play an important role in the development of renal dysfunction in several occupational settings. In this study, renal screening was performed in a group of paint sprayers with exposure to hydrocarbon-based paints, recruited from a car manufacturing plant where personal protective equipment was widely used. The hydrocarbon exposure scores and various markers of renal injury were compared between these subjects and a group of paint sprayers from a previous study who did not use personal protective equipment regularly. Cumulative hydrocarbon exposure scores were calculated from a validated questionnaire. Serum creatinine, urinary total protein, albumin, transferrin, retinol-binding protein, and N-acetylglucosaminidase were evaluated, Both groups experienced heavy hydrocarbon exposure but sprayers who regularly used personal protective equipment had significantly reduced exposure scores due to improved skin and respiratory protection. A significant number of ...