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  1 / 4404 MEDLINE  
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[PMID]:29107876
[Au] Autor:Shu WB; Zhao YB; Ni HG; Zeng H
[Ad] Endereço:Shenzhen Key Laboratory of Circular Economy, Shenzhen Graduate School, Peking University, Shenzhen 518055, China.
[Ti] Título:Size-dependent emission characteristics of airborne parent and halogenated PAHs from municipal solid waste incinerators in Shenzhen, China.
[So] Source:Chemosphere;192:250-257, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Two waste incinerators were selected for investigation of size-dependent emission characteristics of airborne parent and halogenated PAHs (PAHs and HPAHs) and incidence of these pollutants from trash incineration. The concentrations of total PAHs (gas and particles with aerodynamic diameter 0.43-10 µm) in ambient air of Shenzhen incinerators were at the lower end of the global range while those of HPAHs were higher than those of urban air in other studies. High-ring PAHs dominated in PM (66%-86%), while low-ring PAHs dominated in PM (83%-86%). As for PAHs in gaseous phase, low-ring PAHs were collectively account for 86%-97%. ΣHPAH mainly enriched in coarse particles (>83%). The size distributions of ΣPAH and ΣHPAH were both characterized by bimodal peaks dominate in 9.0-10 µm and subordinate in 4.7-5.8 µm. PAHs and HPAHs enrichment in the coarse particles indicates that particle-bound PAHs and HPAHs from incinerators cannot travel great distances. Model simulation results showed the peak of airborne PAHs and HPAHs occurred in approximate 300 m from incinerator, then their concentrations reduced sharply. The extent of affected areas by municipal solid waste incinerators (MSWIs) seem very large, intensity of impacts can be neglected for the very low level of pollutants. Although waste incineration is perceived as most polluting way to manage waste, our study found the damage from incinerator to be far less than originally feared.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/análise
Gases/análise
Hidrocarbonetos Halogenados/análise
Hidrocarbonetos Aromáticos Policíclicos/análise
Resíduos Sólidos/análise
Gerenciamento de Resíduos/métodos
[Mh] Termos MeSH secundário: Poluentes Atmosféricos/química
China
Gases/química
Halogenação
Seres Humanos
Hidrocarbonetos Halogenados/química
Incineração
Hidrocarbonetos Aromáticos Policíclicos/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Gases); 0 (Hydrocarbons, Halogenated); 0 (Polycyclic Aromatic Hydrocarbons); 0 (Solid Waste)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180130
[Lr] Data última revisão:
180130
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171107
[St] Status:MEDLINE


  2 / 4404 MEDLINE  
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[PMID]:29289294
[Au] Autor:Zhu B; Shen C; Gao H; Zhu L; Shao J; Mao L
[Ad] Endereço:State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: bzhu@rcees.ac.cn.
[Ti] Título:Intrinsic chemiluminescence production from the degradation of haloaromatic pollutants during environmentally-friendly advanced oxidation processes: Mechanism, structure-activity relationship and potential applications.
[So] Source:J Environ Sci (China);62:68-83, 2017 Dec.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The ubiquitous distribution of halogenated aromatic compounds (XAr) coupled with their carcinogenicity has raised public concerns on their potential risks to both human health and the ecosystem. Recently, advanced oxidation processes (AOPs) have been considered as an "environmentally-friendly" technology for the remediation and destruction of such recalcitrant and highly toxic XAr. During our study on the mechanism of metal-independent production of hydroxyl radicals (OH) by halogenated quinones and H O , we found, unexpectedly, that an unprecedented OH-dependent two-step intrinsic chemiluminescene (CL) can be produced by H O and tetrachloro-p-benzoquinone, the major carcinogenic metabolite of the widely used wood preservative pentachlorophenol. Further investigations showed that, in all OH-generating systems, CL can also be produced not only by pentachlorophenol and all other halogenated phenols, but also by all XAr tested. A systematic structure-activity relationship study for all 19 chlorophenolic congeners showed that the CL increased with an increasing number of Cl-substitution in general. More importantly, a relatively good correlation was observed between the formation of quinoid/semiquinone radical intermediates and CL generation. Based on these results, we propose that OH-dependent formation of quinoid intermediates and electronically excited carbonyl species is responsible for this unusual CL production; and a rapid, sensitive, simple, and effective CL method was developed not only to detect and quantify trace amount of XAr, but also to provide useful information for predicting the toxicity or monitoring real-time degradation kinetics of XAr. These findings may have broad chemical, environmental and biological implications for future studies on halogenated aromatic persistent organic pollutants.
[Mh] Termos MeSH primário: Hidrocarbonetos Halogenados/química
Modelos Químicos
[Mh] Termos MeSH secundário: Benzoquinonas/química
Peróxido de Hidrogênio/química
Radical Hidroxila/química
Luminescência
Oxirredução
Pentaclorofenol/química
Relação Estrutura-Atividade
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Benzoquinones); 0 (Hydrocarbons, Halogenated); 3352-57-6 (Hydroxyl Radical); BBX060AN9V (Hydrogen Peroxide); D9BSU0SE4T (Pentachlorophenol)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180103
[Lr] Data última revisão:
180103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180101
[St] Status:MEDLINE


  3 / 4404 MEDLINE  
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[PMID]:28753526
[Au] Autor:Bravo N; Hansen S; Økland I; Garí M; Álvarez MV; Matiocevich S; Odland JØ; Grimalt JO
[Ad] Endereço:Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Department of Environmental Chemistry, Jordi Girona, 18, 08034 Barcelona, Catalonia, Spain.
[Ti] Título:Influence of maternal and sociodemographic characteristics on the accumulation of organohalogen compounds in Argentinian women. The EMASAR study.
[So] Source:Environ Res;158:759-767, 2017 10.
[Is] ISSN:1096-0953
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The occurrence of organohalogen compounds in venous serum from post-partum mothers from two Argentinian cities, Salta and Ushuaia, has been investigated (n = 698). 4,4'-DDE was the most abundant compound in these cities, with geometric means of 33 and 67ng/g lipid weight, respectively. City of residence, age and parity were the main determinants of the accumulation of these compounds. Hexachlorobenzene (HCB) was the second most abundant pollutant in Ushuaia, 8.7ng/g lipid, and ß-hexachlorocyclohexane (ß-HCH) in Salta, 7.8ng/g lipid. Decabromodiphenyl ether was higher in Ushuaia than Salta, 8.2 and 4.1ng/g lipid, respectively. The predominance of ß-HCH, 4,4'-DDE and 4,4'-DDT in Salta was related with higher use of pesticides for agricultural applications. The observed higher concentrations of 4,4'-DDE and 4,4'-DDT in the mothers from rural+semi-urban sites than in urban areas were consistent with this agricultural origin. In addition, the most volatile organochlorine compounds included in this study, HCB and α-HCH, were mainly found in Ushuaia. The concentrations of the studied organohalogen pollutants in Argentina were lower than those found in other similar studies which is consistent with the location of these cities in the southern hemisphere. Age, mainly for 4,4'-DDE and polychlorobiphenyl (PCB) congeners 138, 153 and 180, and parity, mainly for HCB, ß-HCH, 4,4'-DDT and PCB congener 118, were the second main determinants of the concentrations of these compounds. Gestational weight gain also influenced on the maternal levels of HCB, ß-HCH, 4,4'-DDT and PCB congeners 118, 138 and 153. Higher weight accumulation during pregnancy involved dilution of these persistent pollutants. Body mass index (BMI) was a statistically significant determinant for 4,4'-DDT, α-HCH and PCB congeners 153 and 180. The observed direct correspondence between higher BMI and 4,4'-DDT concentrations was in agreement with the above reported inputs related with agricultural applications. The reverse correspondence of BMI with α-HCH and the PCB congeners indicated higher dilution at higher weight increase.
[Mh] Termos MeSH primário: Poluentes Ambientais/sangue
Hidrocarbonetos Halogenados/sangue
Bifenilos Policlorados/sangue
[Mh] Termos MeSH secundário: Adolescente
Adulto
Fatores Etários
Argentina
Carga Corporal (Radioterapia)
Índice de Massa Corporal
Feminino
Geografia
Seres Humanos
Meia-Idade
Mães
Paridade
Ganho de Peso
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (Hydrocarbons, Halogenated); DFC2HB4I0K (Polychlorinated Biphenyls)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171120
[Lr] Data última revisão:
171120
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170729
[St] Status:MEDLINE


  4 / 4404 MEDLINE  
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[PMID]:28683408
[Au] Autor:Melnes M; Gabrielsen GW; Herzke D; Sagerup K; Jenssen BM
[Ad] Endereço:Department of Biology, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
[Ti] Título:Dissimilar effects of organohalogenated compounds on thyroid hormones in glaucous gulls.
[So] Source:Environ Res;158:350-357, 2017 10.
[Is] ISSN:1096-0953
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The glaucous gull (Larus hyperboreus) is an arctic top predator and scavenger exposed to high levels of mixtures of organohalogenated contaminants (OHCs) of which many interfere with the thyroid hormone (TH) system. In the present study, we applied statistical modeling to investigate the potential combined influence of the mixture of chlorinated, brominated and perfluorinated organic compounds in plasma of glaucous gulls on their plasma TH concentrations. In females, there were significant negative associations between several organochlorinated compounds (OCs) and free thyroxin (FT4) and triiodothyronine (FT3), indicating additive negative effects on FT4 and FT3. However, in these females there was also a significant positive association between perfluorooctane sulfonate (PFOS) and FT3. The inverse associations between several OCs and FT3 and the contrasting positive association between PFOS and FT3, indicate that these two groups of OHCs may have dissimilar and antagonistic effects on FT3 in female glaucous gulls. In males, there were no associations between any of the OHCs and the THs. That OHCs affect THs in a complex manner involving both additive and antagonistic effects add to the challenge of interpreting the overall functional effect of thyroid disruptive chemicals in wildlife. However, experimental studies are needed to confirm or disprove such effects.
[Mh] Termos MeSH primário: Charadriiformes/metabolismo
Exposição Ambiental
Poluentes Ambientais/sangue
Hidrocarbonetos Halogenados/toxicidade
Glândula Tireoide/efeitos dos fármacos
Hormônios Tireóideos/metabolismo
[Mh] Termos MeSH secundário: Animais
Composição Corporal
Monitoramento Ambiental
Feminino
Masculino
Noruega
Fatores Sexuais
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (Hydrocarbons, Halogenated); 0 (Thyroid Hormones)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171120
[Lr] Data última revisão:
171120
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170707
[St] Status:MEDLINE


  5 / 4404 MEDLINE  
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[PMID]:28651313
[Au] Autor:Cagnetta G; Huang J; Lu M; Wang B; Wang Y; Deng S; Yu G
[Ad] Endereço:State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory of Emerging Organic Contaminants Control (BKLEOCC), School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, PR China.
[Ti] Título:Defect engineered oxides for enhanced mechanochemical destruction of halogenated organic pollutants.
[So] Source:Chemosphere;184:879-883, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Mechanochemical activation of metal oxides is studied by a novel methodology based on solid state reaction with a stable radical specie. Such approach corroborates that vacancy formation by high energy ball milling, also in nonreducible oxides, is responsible for electron release on particles' surfaces. This finding suggests a new defect engineering strategy to improve effectiveness of metal oxides as co-milling reagent for halogenated organic pollutant destruction. Results prove that high valent metal doping of a commonly employed co-milling reagent such as CaO determines 2.5 times faster pollutant degradation rate. This enhancement is due to electron-rich defects generated by the dopant; electrons are transferred to the organic pollutant thus causing its mineralization. The proposed strategy can be easily applied to other reagents.
[Mh] Termos MeSH primário: Hidrocarbonetos Halogenados/química
Modelos Químicos
Óxidos/química
[Mh] Termos MeSH secundário: Fenômenos Mecânicos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hydrocarbons, Halogenated); 0 (Oxides)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171006
[Lr] Data última revisão:
171006
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170628
[St] Status:MEDLINE


  6 / 4404 MEDLINE  
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[PMID]:28614731
[Au] Autor:Bourgeon S; Riemer AK; Tartu S; Aars J; Polder A; Jenssen BM; Routti H
[Ad] Endereço:The Arctic University of Norway, UiT, Department of Arctic and Marine Biology, Tromsø, Norway; Norwegian Polar Institute, Fram Centre, Tromsø, Norway. Electronic address: sophie.bourgeon@uit.no.
[Ti] Título:Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea.
[So] Source:Environ Res;158:94-104, 2017 10.
[Is] ISSN:1096-0953
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:As apex predators, polar bears (Ursus maritimus) are among the most heavily polluted organisms in the Arctic. In addition to this anthropogenic stressor, climate warming has been shown to negatively affect their body condition, reproductive output and survival. Among potential underlying physiological mechanisms, thyroid hormones (THs), which control thermoregulation, metabolism and reproduction, can be affected by a variety of both natural and anthropogenic factors. While THs have been extensively used as proxies for pollution exposure in mammals, including polar bears, there is a lack of knowledge of their natural variations. In this context, we examined seasonal variations in body condition and circulating TH concentrations in free-ranging female polar bears. Females with variable reproductive status (i.e., solitary, with cubs of the year or with yearlings) were sampled from locations with contrasted sea ice conditions. Furthermore, we studied THs in relation to levels of organo-halogenated contaminants. As predicted, solitary females were in better condition than females caring for offspring, especially in spring. In addition, TH levels were lower in autumn compared to spring, although this seasonal effect was mainly observed in solitary females. Finally, the negative relationships between organochlorine and perfluoroalkyl substances and some THs suggest a possible alteration of homeostasis of THs. Since the latter relationships were only observed during spring, we emphasize the importance of considering the ecological factors when using THs as proxies for pollution exposure. Yet, the combined effects of natural and anthropogenic stressors on THs might impair the ability of polar bears to adapt to ongoing climate changes.
[Mh] Termos MeSH primário: Exposição Ambiental
Poluentes Ambientais/sangue
Hidrocarbonetos Halogenados/sangue
Hormônios Tireóideos/sangue
Ursidae/fisiologia
[Mh] Termos MeSH secundário: Animais
Regiões Árticas
Composição Corporal
Monitoramento Ambiental
Jejum
Feminino
Hibernação
Reprodução
Estações do Ano
Svalbard
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (Hydrocarbons, Halogenated); 0 (Thyroid Hormones)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171120
[Lr] Data última revisão:
171120
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170615
[St] Status:MEDLINE


  7 / 4404 MEDLINE  
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[PMID]:28531123
[Au] Autor:Parvez S; Frost K; Sundararajan M
[Ad] Endereço:Department of Environmental Health Science, Indiana University Fairbanks School of Public Health, 1050 Wishard Boulevard, Indianapolis, IN 46202, USA. parvezs@iu.edu.
[Ti] Título:Evaluation of Drinking Water Disinfectant Byproducts Compliance Data as an Indirect Measure for Short-Term Exposure in Humans.
[So] Source:Int J Environ Res Public Health;14(5), 2017 May 20.
[Is] ISSN:1660-4601
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:In the absence of shorter term disinfectant byproducts (DBPs) data on regulated Trihalomethanes (THMs) and Haloacetic acids (HAAs), epidemiologists and risk assessors have used long-term annual compliance (LRAA) or quarterly (QA) data to evaluate the association between DBP exposure and adverse birth outcomes, which resulted in inconclusive findings. Therefore, we evaluated the reliability of using long-term LRAA and QA data as an indirect measure for short-term exposure. Short-term residential tap water samples were collected in peak DBP months (May-August) in a community water system with five separate treatment stations and were sourced from surface or groundwater. Samples were analyzed for THMs and HAAs per the EPA (U.S. Environmental Protection Agency) standard methods (524.2 and 552.2). The measured levels of total THMs and HAAs were compared temporally and spatially with LRAA and QA data, which showed significant differences ( < 0.05). Most samples from surface water stations showed higher levels than LRAA or QA. Significant numbers of samples in surface water stations exceeded regulatory permissible limits: 27% had excessive THMs and 35% had excessive HAAs. Trichloromethane, trichloroacetic acid, and dichloroacetic acid were the major drivers of variability. This study suggests that LRAA and QA data are not good proxies of short-term exposure. Further investigation is needed to determine if other drinking water systems show consistent findings for improved regulation.
[Mh] Termos MeSH primário: Água Potável/análise
Hidrocarbonetos Halogenados/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Desinfecção
Monitoramento Ambiental
Seres Humanos
Reprodutibilidade dos Testes
Abastecimento de Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Drinking Water); 0 (Hydrocarbons, Halogenated); 0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171011
[Lr] Data última revisão:
171011
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170523
[St] Status:MEDLINE


  8 / 4404 MEDLINE  
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[PMID]:28510732
[Au] Autor:Webb GA
[Ad] Endereço:Sumitomo Chemical Australia, PO Box 60, Epping, NSW 1710, Australia.
[Ti] Título:Efficacy of Bistrifluron Termite Bait on Coptotermes lacteus (Isoptera: Rhinotermitidae) in Southern Australia.
[So] Source:J Econ Entomol;110(4):1705-1712, 2017 Aug 01.
[Is] ISSN:1938-291X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Bistrifluron, a benzoylphenyl urea compound, was evaluated for efficacy against Coptotermes lacteus (Froggatt), a mound-building species in southern Australia. Bistrifluron bait (tradename Xterm) was delivered as containerized pellets inserted into plastic in-ground feeding stations implanted in the sides of mounds. Termites actively tunneled in the gaps between pellets and removed bait from the canisters. Two separate trials were conducted, one commencing on 22 September 2011 and the second commencing on 30 November 2011. In trial 1, all 13 treated colonies (seven single and six double treatments) were eliminated within 19 wk, while all five untreated colonies remained healthy. In trial 2, all four treated colonies were eliminated within 14 wk. In trial 1, bait consumed or removed in treated mounds averaged 105 g for single treatments and 147 g for dual treatments, and overall ranged from 7 to 309 g (70-3,090 mg bistrifluron). In trial 2, the four treated colonies removed an average of 85 g of bait. At the time mounds were dismantled, all showed signs of inattention: external cracking, delamination, and general external weathering. Mound repair and temperature profile data indicate that colony decline commenced much earlier than 19 wk and 14 wk, respectively, for trials 1 and 2, from as early as 4 wk onward. The ability of colonies to repair mound damage was impaired as early as 4 wk in some colonies, and mean internal mound temperatures in treated mounds began declining from 8 wk onward and clearly diverged from mean temperatures of untreated mounds thereafter.
[Mh] Termos MeSH primário: Hidrocarbonetos Halogenados
Controle de Insetos
Inseticidas
Isópteros
Compostos de Fenilureia
Feromônios
[Mh] Termos MeSH secundário: Animais
Hidrocarbonetos Halogenados/metabolismo
New South Wales
Compostos de Fenilureia/metabolismo
Feromônios/fisiologia
Dinâmica Populacional
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hydrocarbons, Halogenated); 0 (Insecticides); 0 (Phenylurea Compounds); 0 (Pheromones); 0 (bistrifluron); 0 (insect attractants)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170517
[St] Status:MEDLINE
[do] DOI:10.1093/jee/tox133


  9 / 4404 MEDLINE  
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[PMID]:28477527
[Au] Autor:Godfrey A; Abdel-Moneim A; Sepúlveda MS
[Ad] Endereço:Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, United States.
[Ti] Título:Acute mixture toxicity of halogenated chemicals and their next generation counterparts on zebrafish embryos.
[So] Source:Chemosphere;181:710-712, 2017 Aug.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Perfluorinated chemicals and flame retardants are halogenated compounds commonly used in food packaging and in clothing and electronics, respectively. Due to the hazardous effects of many of these chemicals, manufacturers are developing next generation potential less toxic alternatives. The objective of this study was to assess the toxicity of potentially "safer" alternatives, singly and in mixtures, in relation to their first generation counterparts. We used zebrafish embryos as our model organism due to its high structural and functional homology to other vertebrates and its suitability for early developmental studies. We tested three well studied halogens, perfluorooctanoic acid (PFOA), tris (1,3-dichloro-2-propyl) phosphate (TDCPP) and tetrabromobisphenal A (TBBPA), and two less-studied next generation chemicals, 9,10-Dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) and perfluorobutyric acid (PFBA). First, we identified their lethal concentration (LC ) under 96 h exposures using zebrafish embryos; chemical LC50 values ranged from 1.3 to 13,795 ppm. Next, we tested the toxicity of tertiary mixtures containing the estimated LC values for each chemical which ranged from 126 to 5,094 ppm. We found that chemicals within these mixtures displayed concentration addition suggesting a similar mode of toxic action. Importantly, next generation chemicals were less acutely toxic singly and in mixtures than their first generation counterpart.
[Mh] Termos MeSH primário: Embrião não Mamífero/efeitos dos fármacos
Retardadores de Chama/toxicidade
Hidrocarbonetos Halogenados/toxicidade
[Mh] Termos MeSH secundário: Animais
Caprilatos
Fluorcarbonetos
Compostos Organofosforados
Bifenil Polibromatos
Peixe-Zebra/embriologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Caprylates); 0 (Flame Retardants); 0 (Fluorocarbons); 0 (Hydrocarbons, Halogenated); 0 (Organophosphorus Compounds); 0 (Polybrominated Biphenyls); 947VD76D3L (perfluorooctanoic acid); B1PRV4G0T0 (tris(1,3-dichloro-2-propyl)phosphate); FQI02RFC3A (tetrabromobisphenol A)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170507
[St] Status:MEDLINE


  10 / 4404 MEDLINE  
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[PMID]:28420528
[Au] Autor:Ou-Yang CF; Hua HC; Chou YC; Teng MK; Liu WT; Wang JL
[Ad] Endereço:Department of Atmospheric Sciences, National Central University, Taoyuan 32001, Taiwan.
[Ti] Título:Two-dimensional gas chromatography with electron capture detection for the analysis of atmospheric ozone depleting halocarbons.
[So] Source:J Chromatogr A;1499:158-164, 2017 May 26.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:This study is to develop a GC×GC method with electron capture detection (ECD) to analyze atmospheric halocarbons in the concentration range of parts per trillion by volume (pptv). To enrich atmospheric halocarbons a home-built thermal desorption (TD) device was coupled to the GC×GC-ECD. The technique of flow modulation was adopted using a Deans switch for GC×GC. Several column combinations of first and second dimensions were tested and the column set of DB-5×TG-1301 was found to show the best orthogonality for halocarbons. A series of modulation parameters were tested for their optimal settings. The modulation period (P ) was found to have minimal wrap-around when set at 3s. The modulation ratio (M ) was determined to be 7.82 to ensure reproducible results and maximum sensitivity. The modulation duty cycle (DC) was calculated to be approximately 0.17. Nine halocarbons were separated successfully and seven were calibrated with the use of a certified standard gas mixture. The correlation coefficients (R ) were greater than 0.9972. The reproducibility was better than 1.90% as expressed in relative standard deviation (RSD; N=30) and the detection limits were in the range of pptv for the target halocarbons. A field test by continuous analyzing ambient air with hourly resolution was performed to show the stability of the method as suggested by the homogeneity of certain halocarbons, while also reflecting concentration variation for others when emissions did arise.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/análise
Cromatografia Gasosa/métodos
Hidrocarbonetos Halogenados/análise
Ozônio/análise
[Mh] Termos MeSH secundário: Calibragem
Elétrons
Limite de Detecção
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:EVALUATION STUDIES; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Hydrocarbons, Halogenated); 66H7ZZK23N (Ozone)
[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:170420
[St] Status:MEDLINE



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