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  1 / 2113 MEDLINE  
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[PMID]:29273907
[Au] Autor:Ghiasvand AR; Nouriasl K; Yazdankhah F
[Ad] Endereço:Department of Chemistry, Lorestan University, Khoramabad, Lorestan Province, 6713817133, Iran. a_ghiasvand@yahoo.com.
[Ti] Título:Comparison of the atmospheric- and reduced-pressure HS-SPME strategies for analysis of residual solvents in commercial antibiotics using a steel fiber coated with a multiwalled carbon nanotube/polyaniline nanocomposite.
[So] Source:Anal Bioanal Chem;410(2):361-371, 2018 Jan.
[Is] ISSN:1618-2650
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:A low-cost, sensitive and reliable reduced-pressure headspace solid-phase microextraction (HS-SPME) setup was developed and evaluated for direct extraction of residual solvents in commercial antibiotics, followed by determination by gas chromatography with flame ionization detection (GC-FID). A stainless steel narrow wire was made porous and adhesive by platinization by a modified electrophoretic deposition method and coated with a polyaniline/multiwalled carbon nanotube nanocomposite. All experimental variables affecting the extraction efficiency were investigated for both atmospheric-pressure and reduced-pressure conditions. Comparison of the optimal experimental conditions and the results demonstrated that the reduced-pressure strategy leads to a remarkable increase in the extraction efficiency and reduction of the extraction time and temperature (10 min, 25 °Ï¹ vs 20 min, 40 °Ï¹). Additionally, the reduced-pressure strategy showed better analytical performances compared with those obtained by the conventional HS-SPME-GC-FID method. Limit of detections, linear dynamic ranges, and relative standard deviations of the reduced-pressure HS-SPME procedure for benzene, toluene, ethylbenzene, and xylene (BTEX) in injectable solid drugs were obtained over the ranges of 20-100 pg g , 0.02-40 µg g , and 2.8-10.2%, respectively. The procedure developed was successful for the analysis of BTEX in commercial containers of penicillin, ampicillin, ceftriaxone, and cefazolin. Graphical abstract Schematic representation of the developed RP-HS-SPME setup.
[Mh] Termos MeSH primário: Compostos de Anilina/química
Antibacterianos/análise
Nanocompostos/química
Nanotubos de Carbono/química
Microextração em Fase Sólida/instrumentação
Solventes/análise
Xilenos/análise
[Mh] Termos MeSH secundário: Pressão Atmosférica
Contaminação de Medicamentos
Desenho de Equipamento
Nanocompostos/ultraestrutura
Nanotubos de Carbono/ultraestrutura
Solventes/isolamento & purificação
Aço/química
Xilenos/isolamento & purificação
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Aniline Compounds); 0 (Anti-Bacterial Agents); 0 (Nanotubes, Carbon); 0 (Solvents); 0 (Xylenes); 0 (polyaniline); 12597-69-2 (Steel)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171224
[St] Status:MEDLINE
[do] DOI:10.1007/s00216-017-0726-7


  2 / 2113 MEDLINE  
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[PMID]:29293593
[Au] Autor:Jiang B; Jia P; Zhao W; Wang W
[Ad] Endereço:College of Resource and Civil Engineering, Northeastern University, Shenyang, Liaoning Province, China.
[Ti] Título:The application of compressive sampling in rapid ultrasonic computerized tomography (UCT) technique of steel tube slab (STS).
[So] Source:PLoS One;13(1):e0190281, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:This paper explores a new method for rapid structural damage inspection of steel tube slab (STS) structures along randomly measured paths based on a combination of compressive sampling (CS) and ultrasonic computerized tomography (UCT). In the measurement stage, using fewer randomly selected paths rather than the whole measurement net is proposed to detect the underlying damage of a concrete-filled steel tube. In the imaging stage, the â„“1-minimization algorithm is employed to recover the information of the microstructures based on the measurement data related to the internal situation of the STS structure. A numerical concrete tube model, with the various level of damage, was studied to demonstrate the performance of the rapid UCT technique. Real-world concrete-filled steel tubes in the Shenyang Metro stations were detected using the proposed UCT technique in a CS framework. Both the numerical and experimental results show the rapid UCT technique has the capability of damage detection in an STS structure with a high level of accuracy and with fewer required measurements, which is more convenient and efficient than the traditional UCT technique.
[Mh] Termos MeSH primário: Aço
Tomografia Computadorizada por Raios X/instrumentação
Ultrassom
[Mh] Termos MeSH secundário: Algoritmos
Modelos Teóricos
Tomografia Computadorizada por Raios X/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; VALIDATION STUDIES
[Nm] Nome de substância:
12597-69-2 (Steel)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180215
[Lr] Data última revisão:
180215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180103
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0190281


  3 / 2113 MEDLINE  
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[PMID]:28803160
[Au] Autor:Wang C; Chen Z; Cao W
[Ad] Endereço:Condensed Matter Science and Technology, Institute and Department of Physics, Harbin Institute of Technology, Harbin 150080, China; Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA.
[Ti] Título:Differentiate low impedance media in closed steel tank using ultrasonic wave tunneling.
[So] Source:Ultrasonics;82:130-133, 2018 01.
[Is] ISSN:1874-9968
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Ultrasonic wave tunneling through seriously mismatched media, such as steel and water, is possible only when the frequency matches the resonance of the steel plate. But it is nearly impossible to realize continuous wave tunneling if the low acoustic impedance media is air because the transducer frequency cannot be made so accurate. The issue might be resolved using tone-burst signals. Using finite element simulations, we found that for air media when the cycle number is 20, the -6dB bandwidth of energy transmission increased from 0.001% to 5.9% compared with that of continuous waves. We show that the tunneling waves can give us enough information to distinguish low acoustic impedance media inside a steel tank.
[Mh] Termos MeSH primário: Testes de Impedância Acústica
[Mh] Termos MeSH secundário: Ar
Análise de Elementos Finitos
Aço
Transdutores
Vibração
Água
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
059QF0KO0R (Water); 12597-69-2 (Steel)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180123
[Lr] Data última revisão:
180123
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170814
[St] Status:MEDLINE


  4 / 2113 MEDLINE  
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[PMID]:29253012
[Au] Autor:Vongsvivut J; Truong VK; Al Kobaisi M; Maclaughlin S; Tobin MJ; Crawford RJ; Ivanova EP
[Ad] Endereço:Infrared Microspectroscopy (IRM) Beamline, Australian Synchrotron, Clayton, Victoria, Australia.
[Ti] Título:Synchrotron macro ATR-FTIR microspectroscopic analysis of silica nanoparticle-embedded polyester coated steel surfaces subjected to prolonged UV and humidity exposure.
[So] Source:PLoS One;12(12):e0188345, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Surface modification of polymers and paints is a popular and effective way to enhance the properties of these materials. This can be achieved by introducing a thin coating that preserves the bulk properties of the material, while protecting it from environmental exposure. Suitable materials for such coating technologies are inorganic oxides, such as alumina, titania and silica; however, the fate of these materials during long-term environmental exposure is an open question. In this study, polymer coatings that had been enhanced with the addition of silica nanoparticles (SiO2NPs) and subsequently subjected to environmental exposure, were characterized both before and after the exposure to determine any structural changes resulting from the exposure. High-resolution synchrotron macro ATR-FTIR microspectroscopy and surface topographic techniques, including optical profilometry and atomic force microscopy (AFM), were used to determine the long-term effect of the environment on these dual protection layers after 3 years of exposure to tropical and sub-tropical climates in Singapore and Queensland (Australia). Principal component analysis (PCA) based on the synchrotron macro ATR-FTIR spectral data revealed that, for the 9% (w/w) SiO2NP/polymer coating, a clear discrimination was observed between the control group (no environmental exposure) and those samples subjected to three years of environmental exposure in both Singapore and Queensland. The PCA loading plots indicated that, over the three year exposure period, a major change occurred in the triazine ring vibration in the melamine resins. This can be attributed to the triazine ring being very sensitive to hydrolysis under the high humidity conditions in tropical/sub-tropical environments. This work provides the first direct molecular evidence, acquired using a high-resolution mapping technique, of the climate-induced chemical evolution of a polyester coating. The observed changes in the surface topography of the coating are consistent with the changes in chemical composition.
[Mh] Termos MeSH primário: Materiais Revestidos Biocompatíveis/química
Umidade
Microespectrofotometria
Nanopartículas/química
Poliésteres/química
Dióxido de Silício/química
Aço/química
Síncrotrons
[Mh] Termos MeSH secundário: Meio Ambiente
Espectroscopia Fotoeletrônica
Análise de Componente Principal
Espectroscopia de Infravermelho com Transformada de Fourier
Análise Espectral Raman
Raios Ultravioleta
Água/química
Molhabilidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Coated Materials, Biocompatible); 0 (Polyesters); 059QF0KO0R (Water); 12597-69-2 (Steel); 7631-86-9 (Silicon Dioxide)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180108
[Lr] Data última revisão:
180108
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171219
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0188345


  5 / 2113 MEDLINE  
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[PMID]:28858759
[Au] Autor:Mercorio R; Bonzini M; Angelici L; Iodice S; Delbue S; Mariani J; Apostoli P; Pesatori AC; Bollati V
[Ad] Endereço:EPIGET LAB, Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Via san Barnaba 8, 20122 Milan, Italy.
[Ti] Título:Effects of metal-rich particulate matter exposure on exogenous and endogenous viral sequence methylation in healthy steel-workers.
[So] Source:Environ Res;159:452-457, 2017 11.
[Is] ISSN:1096-0953
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Inhaled particles have been shown to produce systemic changes in DNA methylation. Global hypomethylation has been associated to viral sequence reactivation, possibly linked to the activation of pro-inflammatory pathways occurring after exposure. This observation provides a rationale to investigate viral sequence (both exogenous and endogenous) methylation in association to metal-rich particulate matter exposure. To verify this hypothesis, we chose the Wp promoter of the Epstein-Barr Virus (EBV-Wp) and the promoter of the human-endogenous-retrovirus w (HERV-w), respectively as a paradigm of an exogenous and an endogenous retroviral sequence, to be investigated by bisulfite PCR Pyrosequencing. We enrolled 63 male workers in an electric furnace steel plant, exposed to high level of metal-rich particulate matter. RESULTS: Comparing samples obtained in the first day of a work week (time 0-baseline, after 2 days off work) and the samples obtained after 3 days of work (time 1-post exposure), the mean methylation of EBV-Wp was significantly higher at baseline compared to post-exposure (mean = 56.7%5mC; mean = 47.9%5mC; p-value = 0.009), whereas the mean methylation of HERV-w did not significantly differ. Individual exposure to inhalable particles and metals was estimated based on measures in all working areas and time spent by the study subjects in each area. In a regression model adjusted for age, body mass index and smoking, PM and metal components had a positive association with EBV-Wp methylation (i.e. PM10: ß = 5.99, p-value < 0.038; nickel: ß = 17.82, p-value = 0.02; arsenic: ß = 13.59, p-value < 0.015). CONCLUSIONS: The difference observed comparing baseline and post-exposure samples may be suggestive of a rapid change in EBV methylation induced by air particles, while correlation between EBV methylation and PM/metal exposure may represent a more stable adaptive mechanism. Future studies investigating a larger panel of viral sequences could better elucidate possible mechanisms and their role in pro-inflammatory pathways leading to systemic health effects.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/toxicidade
Metilação de DNA/efeitos dos fármacos
Metalurgia
Metais/toxicidade
Exposição Ocupacional
Material Particulado/toxicidade
[Mh] Termos MeSH secundário: Adulto
DNA Viral/metabolismo
Retrovirus Endógenos/efeitos dos fármacos
Retrovirus Endógenos/metabolismo
Herpesvirus Humano 4/efeitos dos fármacos
Herpesvirus Humano 4/metabolismo
Seres Humanos
Itália
Masculino
Meia-Idade
Reação em Cadeia da Polimerase
Regiões Promotoras Genéticas
Aço
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Air Pollutants); 0 (DNA, Viral); 0 (Metals); 0 (Particulate Matter); 12597-69-2 (Steel)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171120
[Lr] Data última revisão:
171120
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170901
[St] Status:MEDLINE


  6 / 2113 MEDLINE  
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[PMID]:28759441
[Au] Autor:Shi P; Jiang Y; Zhu H; Sun D
[Ad] Endereço:College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China E-mail: zhuhongtao@bjfu.edu.cn; State Grid Beijing Electric Power Research Institute, Beijing 100075, China.
[Ti] Título:Impact of steel slag on the ammonium adsorption by zeolite and a new configuration of zeolite-steel slag substrate for constructed wetlands.
[So] Source:Water Sci Technol;76(3-4):584-593, 2017 Jul.
[Is] ISSN:0273-1223
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The CaO dissolution from slag, as well as the effects of influencing parameters (i.e. pH and Ca concentration) on the ammonium adsorption onto zeolite, was systematically studied in this paper. Modeling results of Ca and OH release from slag indicated that pseudo-second-order reaction had a better fitness than pseudo-first-order reaction. Changing pH value from 7 to 12 resulted in a drastic reduction of the ammonium adsorption capacity on zeolite, from the peak adsorption capacity at pH 7. High Ca concentration in solution also inhibited the adsorption of ammonium onto zeolite. There are two proposed mechanisms for steel slag inhibiting the ammonium adsorption capacity of zeolite. On the one hand, OH released from steel slag can react with ammonium ions to produce the molecular form of ammonia (NH ·H O), which would cause the dissociation of NH from zeolite. On the other hand, Ca could replace the NH ions to adhere onto the surface of zeolite. An innovative substrate filling configuration with zeolite placed upstream of the steel slag was then proposed to eliminate the disadvantageous effects of steel slag. Experimental results showed that this novel filling configuration was superior to two other filling configurations in terms of ammonium removal.
[Mh] Termos MeSH primário: Aço/química
Poluentes Químicos da Água/química
Zonas Úmidas
Zeolitas/química
[Mh] Termos MeSH secundário: Adsorção
Compostos de Amônio
Purificação da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ammonium Compounds); 0 (Water Pollutants, Chemical); 12597-69-2 (Steel); 1318-02-1 (Zeolites)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170801
[St] Status:MEDLINE
[do] DOI:10.2166/wst.2017.232


  7 / 2113 MEDLINE  
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[PMID]:28715664
[Au] Autor:Jia R; Yang D; Xu D; Gu T
[Ad] Endereço:Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA.
[Ti] Título:Electron transfer mediators accelerated the microbiologically influence corrosion against carbon steel by nitrate reducing Pseudomonas aeruginosa biofilm.
[So] Source:Bioelectrochemistry;118:38-46, 2017 Dec.
[Is] ISSN:1878-562X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Electron transfer is a rate-limiting step in microbiologically influenced corrosion (MIC) caused by microbes that utilize extracellular electrons. Cross-cell wall electron transfer is necessary to transport the electrons released from extracellular iron oxidation into the cytoplasm of cells. Electron transfer mediators were found to accelerate the MIC caused by sulfate reducing bacteria. However, there is no publication in the literature showing the effect of electron transfer mediators on MIC caused by nitrate reducing bacteria (NRB). This work demonstrated that the corrosion of anaerobic Pseudomonas aeruginosa (PAO1) grown as a nitrate reducing bacterium biofilm on C1018 carbon steel was enhanced by two electron transfer mediators, riboflavin and flavin adenine dinucleotide (FAD) separately during a 7-day incubation period. The addition of either 10ppm (w/w) (26.6µM) riboflavin or 10ppm (12.7µM) FAD did not increase planktonic cell counts, but they increased the maximum pit depth on carbon steel coupons considerably from 17.5µm to 24.4µm and 25.0µm, respectively. Riboflavin and FAD also increased the specific weight loss of carbon steel from 2.06mg/cm to 2.34mg/cm and 2.61mg/cm , respectively. Linear polarization resistance, electrochemical impedance spectroscopy and potentiodynamic polarization curves all corroborated the pitting and weight loss data.
[Mh] Termos MeSH primário: Biofilmes
Carbono/química
Nitratos/metabolismo
Pseudomonas aeruginosa/metabolismo
Aço/química
[Mh] Termos MeSH secundário: Contagem de Células
Corrosão
Eletroquímica
Transporte de Elétrons
Elétrons
Cinética
Plâncton/microbiologia
Pseudomonas aeruginosa/citologia
Pseudomonas aeruginosa/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrates); 12597-69-2 (Steel); 7440-44-0 (Carbon)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170927
[Lr] Data última revisão:
170927
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170718
[St] Status:MEDLINE


  8 / 2113 MEDLINE  
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[PMID]:28696895
[Au] Autor:Krech E; Selinski S; Blaszkewicz M; Bürger H; Kadhum T; Hengstler JG; Truss MC; Golka K
[Ad] Endereço:a Department of Urology, Klinikum Dortmund GmbH , Dortmund , Germany.
[Ti] Título:Urinary bladder cancer risk factors in an area of former coal, iron, and steel industries in Germany.
[So] Source:J Toxicol Environ Health A;80(7-8):430-438, 2017.
[Is] ISSN:1528-7394
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:This study was performed to investigate the frequency of bladder cancer in patients with an occupational history such as underground hard coal mining and/or painting after the structural change in the local industry. A total of 206 patients with bladder cancer and 207 controls were enlisted regarding occupational and nonoccupational bladder cancer risk factors by questionnaire. The phase II enzymes N-acetyltransferase 2 (NAT2), glutathione S-transferases M1 (GSTM1), and T1 (GSTT1) and the single nucleotide polymorphism (SNP) rs11892031[A/C] reported to be associated with bladder cancer in genome-wide association studies were genotyped. The bladder cancer risk in varnishers and underground hard coal miners was increased as previously shown in a study in this area performed in the 1980s. The occupation of a car mechanic was associated with a significantly elevated bladder cancer risk and higher in the case of underground hard coal miners even though the mine was closed in 1987. The frequency of GSTM1 negative genotype was comparable in cases and controls (53% versus 54%). In the case of NAT2, the slow NAT2 genotype was more frequent (62% versus 58%) and ultra-slow NAT2 genotype (NAT2*6A and/or *7B alleles only) was 23% versus 15%. An occupational history of a varnisher or an underground hard coal miner remains a risk factor for bladder cancer occurrence. Data indicate that in the case of bladder cancer, GSTM1 is a susceptibility factor related to environmental and/or occupational exposure.
[Mh] Termos MeSH primário: Minas de Carvão
Indústrias Extrativas e de Processamento
Doenças Profissionais/epidemiologia
Neoplasias da Bexiga Urinária/epidemiologia
[Mh] Termos MeSH secundário: Adulto
Idoso
Idoso de 80 Anos ou mais
Estudos de Casos e Controles
Feminino
Alemanha/epidemiologia
Seres Humanos
Ferro
Masculino
Meia-Idade
Doenças Profissionais/induzido quimicamente
Fatores de Risco
Aço
Neoplasias da Bexiga Urinária/etiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
12597-69-2 (Steel); E1UOL152H7 (Iron)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170830
[Lr] Data última revisão:
170830
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170712
[St] Status:MEDLINE
[do] DOI:10.1080/10937404.2017.1304719


  9 / 2113 MEDLINE  
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[PMID]:28647270
[Au] Autor:Liu W; Wang Y; Chen Y; Tao S; Liu W
[Ad] Endereço:Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. Electronic address: wjliu0817@gmail.com.
[Ti] Título:Polycyclic aromatic hydrocarbons in ambient air, surface soil and wheat grain near a large steel-smelting manufacturer in northern China.
[So] Source:J Environ Sci (China);57:93-103, 2017 Jul.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The total concentrations and component profiles of polycyclic aromatic hydrocarbons (PAHs) in ambient air, surface soil and wheat grain collected from wheat fields near a large steel-smelting manufacturer in Northern China were determined. Based on the specific isomeric ratios of paired species in ambient air, principle component analysis and multivariate linear regression, the main emission source of local PAHs was identified as a mixture of industrial and domestic coal combustion, biomass burning and traffic exhaust. The total organic carbon (TOC) fraction was considerably correlated with the total and individual PAH concentrations in surface soil. The total concentrations of PAHs in wheat grain were relatively low, with dominant low molecular weight constituents, and the compositional profile was more similar to that in ambient air than in topsoil. Combined with more significant results from partial correlation and linear regression models, the contribution from air PAHs to grain PAHs may be greater than that from soil PAHs.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/análise
Monitoramento Ambiental
Hidrocarbonetos Aromáticos Policíclicos/análise
Poluentes do Solo/análise
[Mh] Termos MeSH secundário: China
Modelos Lineares
Metalurgia
Análise de Componente Principal
Solo/química
Aço
Triticum/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Polycyclic Aromatic Hydrocarbons); 0 (Soil); 0 (Soil Pollutants); 12597-69-2 (Steel)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170626
[St] Status:MEDLINE


  10 / 2113 MEDLINE  
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[PMID]:28531557
[Au] Autor:Abusallout I; Hua G
[Ad] Endereço:Department of Civil and Environmental Engineering, South Dakota State University, Brookings, SD, 57007, USA.
[Ti] Título:Characterization of dissolved organic carbon leached from a woodchip bioreactor.
[So] Source:Chemosphere;183:36-43, 2017 Sep.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Woodchip bioreactors are increasingly being applied to remove nitrate from agricultural subsurface drainage. However, dissolved organic carbon (DOC) released from woodchips may negatively affect the aquatic ecosystems and drinking water supplies. The objective of this study was to evaluate the leaching characteristics, disinfection byproduct (DBP) formation potentials, and treatability of DOC derived from a laboratory woodchip bioreactor. Initial flush of woodchips resulted in the release of high organic content from woodchips. The DOC concentration in the bioreactor effluent decreased rapidly from 71.8 to 20.7 mg/L during the first week of operation, and then gradually decreased to 3.0 mg/L after 240 days of operation under a hydraulic retention time of 24 h. A recycled steel chip filter removed an average of 44.2% of the DOC in the bioreactor effluent. Hydrophobic carbons and organic compounds with molecular weight of 10-100 KDa were the most abundant organic fractions in the DOC released from woodchips. These two DOC fractions were also the most important precursors to the formation of total organic halogen (TOX) during chlorination and chloramination. The TOX yields of woodchip DOC were similar to those of Suwannee River Fulvic Acid, suggesting that organic compounds released from woodchips have great potentials for DBP formation. Alum and polyaluminium chloride were more effective at removing woodchip DOC than ferric chloride during coagulation. Drinking water treatment plants may need to adjust coagulant types and doses in order to remove woodchip DOC in the source water to reduce the DBP formation potential.
[Mh] Termos MeSH primário: Reatores Biológicos
Drenagem Sanitária/métodos
Hidrocarbonetos/análise
Poluentes Químicos da Água/análise
Purificação da Água/métodos
Madeira/química
[Mh] Termos MeSH secundário: Compostos de Alúmen/química
Desinfecção
Ecossistema
Filtração
Floculação
Halogenação
Hidrocarbonetos/química
Aço/química
Poluentes Químicos da Água/química
Abastecimento de Água/normas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alum Compounds); 0 (Hydrocarbons); 0 (Water Pollutants, Chemical); 12597-69-2 (Steel); 34S289N54E (aluminum sulfate)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170927
[Lr] Data última revisão:
170927
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170523
[St] Status:MEDLINE



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