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Pesquisa : D02.355.417 [Categoria DeCS]
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  1 / 2532 MEDLINE  
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[PMID]:28455854
[Au] Autor:Yan Q; Banwell MG; Coote ML; Lee R; Willis AC
[Ad] Endereço:Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT, 2601, Australia.
[Ti] Título:Establishing the True Structure of the Sorbicillinoid-Derived Isolate Rezishanone C by Total Synthesis.
[So] Source:Chem Asian J;12(13):1480-1484, 2017 Jul 04.
[Is] ISSN:1861-471X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The enantiomer, ent-4, of the true structure, 4, of the sorbicillinoid rezishanone C (sorbivinetone) has been synthesized from a homochiral cis-1,2-dihydrocatechol that is itself generated through the whole-cell biotransformation of toluene. These studies together with dispersion-corrected DFT calculations support the proposal that rezishanone C is an artefact of the isolation process and arises through a Diels-Alder reaction between ethyl vinyl ether and sorbicillinol (3).
[Mh] Termos MeSH primário: Cicloexanonas/química
Etil-Éteres/química
Compostos Heterocíclicos de 4 ou mais Anéis/síntese química
Compostos Heterocíclicos de 4 ou mais Anéis/isolamento & purificação
[Mh] Termos MeSH secundário: Reação de Cicloadição
Compostos Heterocíclicos de 4 ou mais Anéis/química
Estrutura Molecular
Teoria Quântica
Estereoisomerismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cyclohexanones); 0 (Ethyl Ethers); 0 (Heterocyclic Compounds, 4 or More Rings); 0 (sorbicillinol); 6235C9592H (ethyl vinyl ether)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180222
[Lr] Data última revisão:
180222
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170430
[St] Status:MEDLINE
[do] DOI:10.1002/asia.201700456


  2 / 2532 MEDLINE  
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[PMID]:28867213
[Au] Autor:Song Y; Yang L
[Ad] Endereço:Medical College, Hangzhou Normal University, No.16 Xueling Road, Xiasha Higher Education Park, Hangzhou 310036, Zhejiang, PR China. Electronic address: sygp_0@163.com.
[Ti] Título:Transgenerational pancreatic impairment with Igf2/H19 epigenetic alteration induced by p,p'-DDE exposure in early life.
[So] Source:Toxicol Lett;280:222-231, 2017 Oct 05.
[Is] ISSN:1879-3169
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The hypothesis of fetal origins indicates that exposures in early development could induce epigenetic modifications in the male germ-line, affecting the susceptibility of adult-onset disease for generations. p,p'-DDE, the primary metabolite of persistent organochlorine pesticide DDT, is highly correlated with impaired glucose tolerance (IGT) and a strong contributing factor to type 2 diabetes. In our previous study, ancestral p,p'-DDE exposure could induce transgenerational impaired male fertility with sperm Igf2 hypomethylation. It is still unknown whether this germline epigenetic defect would affect the somatic tissue endocrine pancreas. Gestating F0 generation females were exposed to p,p'-DDE from gestation day 8 to 15. The F1 male offspring were mated with female to produce F2 progeny. F3 generation was obtained by intercrossing the control and treated male and female of F2 generation and divided as C♂-C♀, DDE♂-DDE♀, DDE♂-C♀ and C♂-DDE♀. Results indicated that F1 offspring in p,p'-DDE group exhibited impaired glucose tolerance (IGT), abnormal insulin secretion, ß-cell dysfunction and altered Igf2 and H19 expression induced by Igf2/H19 hypomethylation, which could be transferred to the F3 offspring through the male germ line. IGT and abnormal insulin secretion were more obvious in males than those in females. Ancestral p,p'-DDE exposure could induce transgenerational pancreatic impairment with Igf2/H19 epigenetic defect.
[Mh] Termos MeSH primário: Epigênese Genética
Etil-Éteres/toxicidade
Fator de Crescimento Insulin-Like II/metabolismo
Células Secretoras de Insulina/metabolismo
RNA Longo não Codificante/metabolismo
[Mh] Termos MeSH secundário: Animais
Diabetes Mellitus
Exposição Ambiental
Feminino
Regulação da Expressão Gênica/efeitos dos fármacos
Teste de Tolerância a Glucose
Fator de Crescimento Insulin-Like II/genética
Masculino
Pancrelipase/genética
Pancrelipase/metabolismo
RNA Longo não Codificante/genética
RNA Mensageiro/genética
RNA Mensageiro/metabolismo
Ratos
Ratos Sprague-Dawley
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethyl Ethers); 0 (H19 long non-coding RNA); 0 (RNA, Long Noncoding); 0 (RNA, Messenger); 0 (insulin-like growth factor II, rat); 0JJZ8LER32 (bis(2-chloro-1-methylethyl) ether); 53608-75-6 (Pancrelipase); 67763-97-7 (Insulin-Like Growth Factor II)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171017
[Lr] Data última revisão:
171017
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170905
[St] Status:MEDLINE


  3 / 2532 MEDLINE  
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[PMID]:28510305
[Au] Autor:Li X; Zhao Y; Brennan A; McCeig M; Wolden CA; Yang Y
[Ad] Endereço:Department of Chemistry, Colorado School of Mines, 1012 14th Street, Golden, CO, 80401, USA.
[Ti] Título:Reactive Precipitation of Anhydrous Alkali Sulfide Nanocrystals with Concomitant Abatement of Hydrogen Sulfide and Cogeneration of Hydrogen.
[So] Source:ChemSusChem;10(14):2904-2913, 2017 Jul 21.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Anhydrous alkali sulfide (M S, M=Li or Na) nanocrystals (NCs) are important materials central to the development of next generation cathodes and solid-state electrolytes for advanced batteries, but not commercially available at present. This work reports an innovative method to directly synthesize M S NCs through alcohol-mediated reactions between alkali metals and hydrogen sulfide (H S). In the first step, the alkali metal is complexed with alcohol in solution, forming metal alkoxide (ROM) and releasing hydrogen (H ). Next, H S is bubbled through the ROM solution, where both chemicals are completely consumed to produce phase-pure M S NC precipitates and regenerate alcohol that can be recycled. The M S NCs morphology may be tuned through the choice of the alcohol and solvent. Both synthetic steps are thermodynamically favorable (ΔG <-100 kJ mol ), proceeding rapidly to completion at ambient temperature with almost 100 % atom efficiency. The net result, H S+2 m→M S+H , makes good use of a hazardous chemical (H S) and delivers two value-added products that naturally phase separate for easy recovery. This scalable approach provides an energy-efficient and environmentally benign solution to the production of nanostructured materials required in emerging battery technologies.
[Mh] Termos MeSH primário: Hidrogênio/química
Nanopartículas/química
Sulfetos/química
[Mh] Termos MeSH secundário: Etanol/análogos & derivados
Etanol/química
Etil-Éteres/química
Química Verde
Solventes/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethyl Ethers); 0 (Solvents); 0 (Sulfides); 141-52-6 (sodium ethoxide); 3K9958V90M (Ethanol); 7YNJ3PO35Z (Hydrogen); GXS24JF5IW (1,2-dimethoxyethane); YGR27ZW0Y7 (sodium sulfide)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170517
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700532


  4 / 2532 MEDLINE  
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[PMID]:28133941
[Au] Autor:Wan H; Mao Y; Liu Z; Bai Q; Peng Z; Bao J; Wu G; Liu Y; Wang D; Xie J
[Ad] Endereço:Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China.
[Ti] Título:Influence of Enhanced O Provision on the Discharge Performance of Li-air Batteries by Incorporating Fluoroether.
[So] Source:ChemSusChem;10(7):1385-1389, 2017 Apr 10.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:As the first step during discharge, the mass transfer of oxygen should play a crucial role in Li-air batteries to tailor the growth of discharge products, however, not enough attention has been paid to this issue. Herein, we introduce an oxygen-enriching cosolvent, 1,2-(1,1,2,2-tetrafluoroethoxy) ethane (FE1), into the electrolyte, and investigate its influence on the discharge performance. The incorporation of this novel cosolvent consistently enhances the oxygen solubility of the electrolyte, and improves the oxygen diffusivity following a volcano-shape trend peaking at 50 % FE1. It is interesting that the discharge capacities obtained with the investigated electrolytes share the similar volcano trends as the oxygen transport under 50 mA g and higher current densities. The improved oxygen diffusion could benefit the volumetric utilization of the air cathode, especially at the separator side, probably owing to the fast oxygen transport to moderate its concentration gradient. Our results demonstrate the importance of oxygen provision, which easily becomes the capacity-determining factor.
[Mh] Termos MeSH primário: Ar
Fontes de Energia Elétrica
Etano/química
Etil-Éteres/química
Lítio/química
Oxigênio/química
[Mh] Termos MeSH secundário: Condutividade Elétrica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethyl Ethers); 9FN79X2M3F (Lithium); L99N5N533T (Ethane); S88TT14065 (Oxygen)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170606
[Lr] Data última revisão:
170606
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170131
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201601725


  5 / 2532 MEDLINE  
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[PMID]:28051317
[Au] Autor:Golghalyani V; Neupärtl M; Wittig I; Bahr U; Karas M
[Ad] Endereço:Institute of Pharmaceutical Chemistry, Goethe-University , Frankfurt am Main 60438, Germany.
[Ti] Título:ArgC-Like Digestion: Complementary or Alternative to Tryptic Digestion?
[So] Source:J Proteome Res;16(2):978-987, 2017 Feb 03.
[Is] ISSN:1535-3907
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Enzymatic digestion of complex protein samples is often performed by use of multiple proteases to improve protein identification and characterization. Combining trypsin with ArgC is one option to enhance sequence coverage in bottom-up proteomics. However, the low selectivity of this endoprotease derogates from the benefit of the combination. Our approach here is to mimic ArgC digestion by chemically modifying all lysine residues in proteins so that trypsin can only cleave C-terminal to arginine. Four different amine modifications, dimethylation, acetylation, propionylation, and carbethoxylation, were tested, and the protocols were optimized. A nearly complete conversion of the primary amines was achieved for all modifications. Tryptic digestion of Escherichia coli lysate proteins after acylation of lysine residues shows the most significant improvement compared with data received from ArgC digest. After propionylation, 9216 unique peptides identified 1439 proteins, which, compared with a conventional tryptic digestion, represents the identification of 150 additional proteins due to a reasonable reduction of the sample complexity and higher fragmentation efficiencies of the peptides. It is therefore concluded that the Arg-C like digestion should no longer be regarded as a complementary approach but forms a viable and superior alternative to the conventional trypsin digestion.
[Mh] Termos MeSH primário: Aldeído Oxirredutases/química
Proteínas de Bactérias/química
Proteínas de Escherichia coli/análise
Fragmentos de Peptídeos/isolamento & purificação
Processamento de Proteína Pós-Traducional
Proteoma/análise
Tripsina/química
[Mh] Termos MeSH secundário: Acetilação
Sequência de Aminoácidos
Cromatografia Líquida
Escherichia coli/química
Proteínas de Escherichia coli/química
Etil-Éteres/química
Metilação
Propionatos/química
Proteólise
Proteoma/química
Espectrometria de Massas em Tandem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bacterial Proteins); 0 (Escherichia coli Proteins); 0 (Ethyl Ethers); 0 (Peptide Fragments); 0 (Propionates); 0 (Proteome); EC 1.2.- (Aldehyde Oxidoreductases); EC 1.2.1.38 (argC protein, Bacteria); EC 3.4.21.4 (Trypsin); JHU490RVYR (propionic acid)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171016
[Lr] Data última revisão:
171016
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170105
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jproteome.6b00921


  6 / 2532 MEDLINE  
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[PMID]:27860417
[Au] Autor:Schafzahl L; Hanzu I; Wilkening M; Freunberger SA
[Ad] Endereço:Institute of Chemistry and Technology of Materials, Graz University of Technology, Graz, Austria.
[Ti] Título:An Electrolyte for Reversible Cycling of Sodium Metal and Intercalation Compounds.
[So] Source:ChemSusChem;10(2):401-408, 2017 Jan 20.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Na battery chemistries show poor passivation behavior of low voltage Na storage compounds and Na metal with organic carbonate-based electrolytes adopted from Li-ion batteries. Therefore, a suitable electrolyte remains a major challenge for establishing Na batteries. Here we report highly concentrated sodium bis(fluorosulfonyl)imide (NaFSI) in dimethoxyethane (DME) electrolytes and investigate them for Na metal and hard carbon anodes and intercalation cathodes. For a DME/NaFSI ratio of 2, a stable passivation of anode materials was found owing to the formation of a stable solid electrolyte interface, which was characterized spectroscopically. This permitted non-dentritic Na metal cycling with approximately 98 % coulombic efficiency as shown for up to 300 cycles. The NaFSI/DME electrolyte may enable Na-metal anodes and allows for more reliable assessment of electrode materials in Na-ion half-cells, as is demonstrated by comparing half-cell cycling of hard carbon anodes and Na V (PO ) cathodes with a widely used carbonate and the NaFSI/DME electrolyte.
[Mh] Termos MeSH primário: Fontes de Energia Elétrica
Etil-Éteres/química
Sódio/química
Sulfonamidas/química
[Mh] Termos MeSH secundário: Carbono/química
Eletrodos
Vanadatos/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethyl Ethers); 0 (Sulfonamides); 3WHH0066W5 (Vanadates); 7440-44-0 (Carbon); 9NEZ333N27 (Sodium); GXS24JF5IW (1,2-dimethoxyethane)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170523
[Lr] Data última revisão:
170523
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161119
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201601222


  7 / 2532 MEDLINE  
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[PMID]:27879637
[Au] Autor:Zhou Y; Zhang C; Qiu Y; Liu L; Yang T; Dong H; Satoh T; Okamoto Y
[Ad] Endereço:Polymer Materials Research Center, Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China. zhouyanli0808022@163.com.
[Ti] Título:Temperature-Triggered Switchable Helix-Helix Inversion of Poly(phenylacetylene) Bearing l-Valine Ethyl Ester Pendants and Its Chiral Recognition Ability.
[So] Source:Molecules;21(11), 2016 Nov 21.
[Is] ISSN:1420-3049
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:A phenylacetylene containing the l-valine ethyl ester pendant (PAA-Val) was synthesized and polymerized by an organorhodium catalyst (Rh(nbd)BPh4) to produce the corresponding one-handed helical -poly(phenylacetylene) (PPAA-Val). PPAA-Val showed a unique temperature-triggered switchable helix-sense in chloroform, while it was not observed in highly polar solvents, such as , '-dimethylformamide (DMF). By heating the solution of PPAA-Val in chloroform, the sign of the CD absorption became reversed, but recovered after cooling the solution to room temperature. Even after six cycles of the heating-cooling treatment, the helix sense of the PPAA-Val's backbone was still switchable without loss of the CD intensity. The PPAA-Val was then coated on silica gel particles to produce novel chiral stationary phases (CSPs) for high-performance liquid chromatography (HPLC). These novel PPAA-Val based CSPs showed a high chiral recognition ability for racemic mandelonitrile ( = 2.18) and racemic - , '-diphenylcyclohexane-1,2-dicarboxamide ( = 2.60). Additionally, the one-handed helical -polyene backbone of PPAA-Val was irreversibly destroyed to afford PPAA-Val-H by heating in dimethyl sulfoxide (DMSO) accompanied by the complete disappearance of the Cotton effect. Although PPAA-Val-H had the same l-valine ethyl ester pendants as its -isomer PPAA-Val, it showed no chiral recognition. It was concluded that the one-handed helical -polyene backbone of PPAA-Val plays an important role in the chiral recognition ability.
[Mh] Termos MeSH primário: Acetileno/análogos & derivados
Etil-Éteres/química
Conformação Molecular
Temperatura Ambiente
Valina/química
[Mh] Termos MeSH secundário: Acetileno/síntese química
Acetileno/química
Dicroísmo Circular
Espectroscopia Fotoeletrônica
Polimerização
Espectroscopia de Prótons por Ressonância Magnética
Estereoisomerismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethyl Ethers); 0 (poly(phenylacetylene)); HG18B9YRS7 (Valine); OC7TV75O83 (Acetylene)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170411
[Lr] Data última revisão:
170411
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161124
[St] Status:MEDLINE


  8 / 2532 MEDLINE  
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[PMID]:27420042
[Au] Autor:Wei T; Yang K; Bai B; Zang J; Yu X; Mao D
[Ad] Endereço:School of Food and Biological Engineering, Zhengzhou University of Light Industry, 5 Dongfeng Rd., Zhengzhou 450002, China. weit8008@zzuli.edu.cn.
[Ti] Título:Enzymatic Hydrolytic Resolution of Racemic Ibuprofen Ethyl Ester Using an Ionic Liquid as Cosolvent.
[So] Source:Molecules;21(7), 2016 Jul 13.
[Is] ISSN:1420-3049
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:The aim of this study was to develop an ionic liquid (IL) system for the enzymatic resolution of racemic ibuprofen ethyl ester to produce (S)-ibuprofen. Nineteen ILs were selected for use in buffer systems to investigate the effects of ILs as cosolvents for the production of (S)-ibuprofen using thermostable esterase (EST10) from Thermotoga maritima. Analysis of the catalytic efficiency and conformation of EST10 showed that [OmPy][BF4] was the best medium for the EST10-catalyzed production of (S)-ibuprofen. The maximum degree of conversion degree (47.4%), enantiomeric excess of (S)-ibuprofen (96.6%) and enantiomeric ratio of EST10 (177.0) were achieved with an EST10 concentration of 15 mg/mL, racemic ibuprofen ethyl ester concentration of 150 mM, at 75 °C , with a reaction time of 10 h. The reaction time needed to achieve the highest yield of (S)-ibuprofen was decreased from 24 h to 10 h. These results are relevant to the proposed application of ILs as solvents for the EST10-catalyzed production of (S)-ibuprofen.
[Mh] Termos MeSH primário: Etil-Éteres/química
Ibuprofeno/química
Líquidos Iônicos/química
Solventes/química
[Mh] Termos MeSH secundário: Catálise
Concentração de Íons de Hidrogênio
Hidrólise
Conformação Molecular
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethyl Ethers); 0 (Ionic Liquids); 0 (Solvents); WK2XYI10QM (Ibuprofen)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170418
[Lr] Data última revisão:
170418
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160716
[St] Status:MEDLINE


  9 / 2532 MEDLINE  
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[PMID]:27345462
[Au] Autor:Siankevich S; Fei Z; Scopelliti R; Jessop PG; Zhang J; Yan N; Dyson PJ
[Ad] Endereço:Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
[Ti] Título:Direct Conversion of Mono- and Polysaccharides into 5-Hydroxymethylfurfural Using Ionic-Liquid Mixtures.
[So] Source:ChemSusChem;9(16):2089-96, 2016 Aug 23.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Platform chemicals are usually derived from petrochemical feedstocks. A sustainable alternative commences with lignocellulosic biomass, a renewable feedstock, but one that is highly challenging to process. Ionic liquids (ILs) are able to solubilize biomass and, in the presence of catalysts, convert the biomass into useful platform chemicals. Herein, we demonstrate that mixtures of ILs are powerful systems for the selective catalytic transformation of cellulose into 5-hydroxymethylfurfural (HMF). Combining ILs with continuous HMF extraction into methyl-isobutyl ketone or 1,2-dimethoxyethane, which form a biphase with the IL mixture, allows the online separation of HMF in high yield. This one-step process is operated under relatively mild conditions and represents a significant step forward towards sustainable HMF production.
[Mh] Termos MeSH primário: Celulose/química
Furaldeído/análogos & derivados
Glucose/química
Líquidos Iônicos/química
[Mh] Termos MeSH secundário: Etil-Éteres/química
Furaldeído/química
Metil n-Butil Cetona/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ethyl Ethers); 0 (Ionic Liquids); 6QDY60NH6N (Methyl n-Butyl Ketone); 70ETD81LF0 (5-hydroxymethylfurfural); 9004-34-6 (Cellulose); DJ1HGI319P (Furaldehyde); GXS24JF5IW (1,2-dimethoxyethane); IY9XDZ35W2 (Glucose); U5T7B88CNP (methyl isobutyl ketone)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170613
[Lr] Data última revisão:
170613
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160628
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201600313


  10 / 2532 MEDLINE  
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[PMID]:26946495
[Au] Autor:Quast KW; Levine AD; Kester JE; Fordham CL
[Ad] Endereço:Amec Foster Wheeler, 2030 Falling Waters Road, Suite 300, Knoxville, TN, 37922, USA. konrad.quast@amecfw.com.
[Ti] Título:Forensic analysis of tertiary-butyl alcohol (TBA) detections in a hydrocarbon-rich groundwater basin.
[So] Source:Environ Monit Assess;188(4):208, 2016 Apr.
[Is] ISSN:1573-2959
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Tertiary-butyl alcohol (TBA), a high-production volume (HPV) chemical, was sporadically detected in groundwater and coalbed methane (CBM) wells in southeastern Colorado's hydrocarbon-rich Raton Basin. TBA concentrations in shallow water wells averaged 75.1 µg/L, while detections in deeper CBM wells averaged 14.4 µg/L. The detection of TBA prompted a forensic investigation to try to identify potential sources. Historic and recent data were reviewed to determine if there was a discernable pattern of TBA occurrence. Supplemental samples from domestic water wells, monitor wells, CBM wells, surface waters, and hydraulic fracturing (HF) fluids were analyzed for TBA in conjunction with methyl tertiary-butyl ether (MTBE) and ethyl tertiary-butyl ether (ETBE), proxies for evidence of contamination from reformulated gasoline or associated oxygenates. Exploratory microbiological sampling was conducted to determine if methanotrophic organisms co-occurred with TBA in individual wells. Meaningful comparisons of historic TBA data were limited due to widely varying reporting limits. Mapping of TBA occurrence did not reveal any spatial patterns or physical associations with CBM operations or contamination plumes. Additionally, TBA was not detected in HF fluids or surface water samples. Given the widespread use of TBA in industrial and consumer products, including water well completion materials, it is likely that multiple diffuse sources exist. Exploratory data on stable isotopes, dissolved gases, and microbial profiling provide preliminary evidence that methanotrophic activity may be producing TBA from naturally occurring isobutane. Reported TBA concentrations were significantly below a conservative risk-based drinking water screening level of 8000 µg/L derived from animal toxicity data.
[Mh] Termos MeSH primário: Água Subterrânea/química
Poluentes Químicos da Água/análise
terc-Butil Álcool/análise
[Mh] Termos MeSH secundário: Colorado
Monitoramento Ambiental
Etil-Éteres
Gasolina/análise
Hidrocarbonetos/análise
Éteres Metílicos/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Ethyl Ethers); 0 (Gasoline); 0 (Hydrocarbons); 0 (Methyl Ethers); 0 (Water Pollutants, Chemical); 3R9B16WR19 (ethyl tert-butyl ether); MD83SFE959 (tert-Butyl Alcohol)
[Em] Mês de entrada:1608
[Cu] Atualização por classe:171020
[Lr] Data última revisão:
171020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160307
[St] Status:MEDLINE
[do] DOI:10.1007/s10661-016-5193-7



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