Base de dados : MEDLINE
Pesquisa : J01.637 [Categoria DeCS]
Referências encontradas : 2202 [refinar]
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  1 / 2202 MEDLINE  
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[PMID]:29478662
[Au] Autor:Luo P; Roca A; Tiede K; Privett K; Jiang J; Pinkstone J; Ma G; Veinot J; Boxall A
[Ad] Endereço:School of Environment Science and Spatial informatics, Chinese University of Mining and Technology, Xuzhou 221000, China. Electronic address: luoping@cumt.edu.cn.
[Ti] Título:Application of nanoparticle tracking analysis for characterising the fate of engineered nanoparticles in sediment-water systems.
[So] Source:J Environ Sci (China);64:62-71, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Novel applications of nanotechnology may lead to the release of engineered nanoparticles (ENPs), which result in concerns over their potential environmental hazardous impact. It is essential for the research workers to be able to quantitatively characterise ENPs in the environment and subsequently to assist the risk assessment of the ENPs. This study hence explored the application of nanoparticle tracking system (NTA) to quantitatively describe the behaviour of the ENPs in natural sediment-water systems. The NTA allows the measurement of both particle number concentration (PNC) and particle size distribution (PSD) of the ENPs. The developed NTA method was applied to a range of gold and magnetite ENPs with a selection of surface properties. The results showed that the positively-charged ENPs interacted more strongly with the sediment than neutral and negatively-charged ENPs. It was also found that the citrate coated Au ENPs had a higher distribution percentage (53%) than 11-mercaptoundecanoic acid coated Au ENPs (20%) and citrate coated magnetite ENPs (21%). The principles of the electrostatic interactions between hard (and soft) acids and bases (HSAB) are used to explain such behaviours; the hard base coating (i.e. citrate ions) will interact more strongly with hard acid (i.e. magnetite) than soft acid (i.e. gold). The results indicate that NTA is a complementary method to existing approaches to characterise the fate and behaviour of ENPs in natural sediment.
[Mh] Termos MeSH primário: Monitoramento Ambiental/métodos
Manufaturas
Nanopartículas/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Ácidos Graxos
Nanopartículas de Magnetita
Nanotecnologia
Eletricidade Estática
Compostos de Sulfidrila
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (11-mercaptoundecanoic acid); 0 (Fatty Acids); 0 (Magnetite Nanoparticles); 0 (Sulfhydryl Compounds); 0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE


  2 / 2202 MEDLINE  
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[PMID]:28982118
[Au] Autor:Wu BY; Sheng XQ; Hao Y
[Ad] Endereço:School of Electronic Engineering and Computer Science, Queen Mary University of London, London, United Kingdom.
[Ti] Título:Effective media properties of hyperuniform disordered composite materials.
[So] Source:PLoS One;12(10):e0185921, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The design challenge of new functional composite materials consisting of multiphase materials has attracted an increasing interest in recent years. In particular, understanding the role of distributions of ordered and disordered particles in a host media is scientifically and technologically important for designing novel materials and devices with superior spectral and angular properties. In this work, the effective medium property of disordered composite materials consisting of hyperuniformly distributed hard particles at different filling fractions is investigated. To accurately extract effective permittivity of a disordered composite material, a full-wave finite element method and the transmission line theory are used. Numerical results show that the theory of hyperuniformity can be conveniently used to design disordered composite materials with good accuracy compared with those materials with randomly dispersed particles. Furthermore, we demonstrate that a Luneburg lens based on the proposed hyperuniform media has superior radiation properties in comparison with previously reported metamaterial designs and it may open up a new avenue in electromagnetic materials-by-design.
[Mh] Termos MeSH primário: Manufaturas
[Mh] Termos MeSH secundário: Radiação Eletromagnética
Modelos Teóricos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171006
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0185921


  3 / 2202 MEDLINE  
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[PMID]:28538720
[Au] Autor:Tian P
[Ti] Título:China's blue-chip future.
[So] Source:Nature;545(7655):S54-S57, 2017 05 24.
[Is] ISSN:1476-4687
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Manufaturas/economia
Pesquisa/economia
[Mh] Termos MeSH secundário: China
Teste de Materiais/economia
Nanoestruturas
Nanotecnologia/economia
Pesquisa/estatística & dados numéricos
Relatório de Pesquisa
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171004
[Lr] Data última revisão:
171004
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170525
[St] Status:MEDLINE
[do] DOI:10.1038/545S54a


  4 / 2202 MEDLINE  
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[PMID]:28323895
[Au] Autor:Shott MJ
[Ad] Endereço:Department of Anthropology and Classical Studies, University of Akron, Akron, Ohio, United States of America.
[Ti] Título:Stage and continuum approaches in prehistoric biface production: A North American perspective.
[So] Source:PLoS One;12(3):e0170947, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:North American lithic analysis often assigns biface preforms to discrete, successive stages defined in Callahan's influential study. Yet recent research questions the stage concept, emphasizing instead a continuous view of the reduction process. To compare stage and continuum approaches, their assumptions are tested in experimental replicas, including Callahan's, and empirical Paleoindian preform assemblages. In these samples, biface reduction is a process that can be tracked and measured by continuous measures of size and reduction allometry. The process is characterized by continuous variation in the rate at which preform weight declines with preform volume. That is, weight declines at an ever-declining rate through the production process. Reduction is complex, but understood better as an allometric process than as a sequence of technological stages. "Stage" may be a useful heuristic or summary device, but preform assemblages should be analyzed in detail to reveal the continuous allometric processes that govern biface production.
[Mh] Termos MeSH primário: Arqueologia/métodos
Manufaturas
Modelos Teóricos
[Mh] Termos MeSH secundário: Conjuntos de Dados como Assunto
Seres Humanos
Modelos Lineares
América do Norte
Análise de Componente Principal
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170823
[Lr] Data última revisão:
170823
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170322
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0170947


  5 / 2202 MEDLINE  
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[PMID]:28231301
[Au] Autor:Carmona-Quiroga PM; Jacobs RM; Martínez-Ramírez S; Viles HA
[Ad] Endereço:School of Geography and the Environment, University of Oxford, Oxford, United Kingdom.
[Ti] Título:Durability of anti-graffiti coatings on stone: natural vs accelerated weathering.
[So] Source:PLoS One;12(2):e0172347, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Extending the use of novel anti-graffiti coatings to built heritage could be of particular interest providing the treatments are efficient enough in facilitating graffiti removal and long-lasting to maintain their protective properties without interfering with the durability of the substrates. However, studies of the durability of these coatings are scarce and have been mainly carried out under accelerated weathering conditions, the most common practice for assessing the durability of materials but one that does not reproduce accurately natural working conditions. The present study aimed to assess the durability of the anti-graffiti protection afforded by two anti-graffiti treatments (a water dispersion of polyurethane with a perfluoropolyether backbone and a water based crystalline micro wax) on Portland limestone and Woodkirk sandstone after 1 year of outdoor exposure in the South of England with periodic painting and cleaning episodes taking place. A parallel study under artificial weathering conditions in a QUV chamber for 2000 hours was also carried out. Changes to the coatings were assessed by measuring colour, gloss, water-repellency, roughness and microstructure, the latter through micro-Raman and optical microscope observations, periodically during the experiments. The results show that both anti-graffiti treatments deteriorated under both artificial and natural weathering conditions. For the polyurethane based anti-graffiti treatment, artificial ageing produced more deterioration than 1 year of outdoor exposure in the south of England due to loss of adhesion from the stones, whereas for micro wax coating there were no substantial differences between the two types of weathering.
[Mh] Termos MeSH primário: Manufaturas
[Mh] Termos MeSH secundário: Carbonato de Cálcio/química
Manufaturas/análise
Pinturas
Propriedades de Superfície
Tempo (Meteorologia)
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
H0G9379FGK (Calcium Carbonate)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170821
[Lr] Data última revisão:
170821
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170224
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172347


  6 / 2202 MEDLINE  
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[PMID]:28198664
[Au] Autor:Rajala P; Bomberg M; Vepsäläinen M; Carpén L
[Ad] Endereço:a Materials Performance , Technical Research Centre of Finland (VTT) , Espoo , Finland.
[Ti] Título:Microbial fouling and corrosion of carbon steel in deep anoxic alkaline groundwater.
[So] Source:Biofouling;33(2):195-209, 2017 Feb.
[Is] ISSN:1029-2454
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Understanding the corrosion of carbon steel materials of low and intermediate level radioactive waste under repository conditions is crucial to ensure the safe storage of radioactive contaminated materials. The waste will be in contact with the concrete of repository silos and storage containers, and eventually with groundwater. In this study, the corrosion of carbon steel under repository conditions as well as the microbial community forming biofilm on the carbon steel samples, consisting of bacteria, archaea, and fungi, was studied over a period of three years in a groundwater environment with and without inserted concrete. The number of biofilm forming bacteria and archaea was 1,000-fold lower, with corrosion rates 620-times lower in the presence of concrete compared to the natural groundwater environment. However, localized corrosion was detected in the concrete-groundwater environment indicating the presence of local microenvironments where the conditions for pitting corrosion were favorable.
[Mh] Termos MeSH primário: Incrustação Biológica
Carbono/química
Corrosão
Água Subterrânea
Manufaturas/microbiologia
Aço/química
[Mh] Termos MeSH secundário: Biofilmes/crescimento & desenvolvimento
Incrustação Biológica/prevenção & controle
Água Subterrânea/química
Água Subterrânea/microbiologia
Locais de Resíduos Perigosos/normas
Consórcios Microbianos/fisiologia
Resíduos Radioativos/análise
Resíduos Radioativos/prevenção & controle
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Radioactive Waste); 12597-69-2 (Steel); 7440-44-0 (Carbon)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170828
[Lr] Data última revisão:
170828
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170216
[St] Status:MEDLINE
[do] DOI:10.1080/08927014.2017.1285914


  7 / 2202 MEDLINE  
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[PMID]:28134027
[Au] Autor:Morsi T; Hegazy R; Badawy W
[Ad] Endereço:a Radiation Protection & Civil Defense Department , Egyptian Atomic Energy Authority (EAEA), Nuclear Research Center , Abu Zaabal , Egypt.
[Ti] Título:Radiological impact assessment to the environment due to waste from disposal of porcelain.
[So] Source:Int J Radiat Biol;93(6):653-659, 2017 Jun.
[Is] ISSN:1362-3095
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The present study aimed to assess the radiological parameters from gamma rays due to the uncontrolled disposal of porcelain waste to the environment. Qualitative and quantitative identification of radionuclides in the investigated samples was carried out by means of a high-purity germanium (HPGe) detector. The average activity concentrations of the local porcelain samples were measured as 208.28 Bq/kg for Ra, 125.73 Bq/kg for U, 84.94 Bq/kg for Th and 1033.61 Bq/kg for K, respectively. The imported samples had an average activity of 240.57 Bq/kg for Ra, 135.56 Bq/kg for U, 115.74 Bq/kg for Th and 1312.49 Bq/kg for K, respectively. Radiological parameters and the radium equivalent Ra for the investigated samples were calculated. The external and internal hazard indices, representative level index (I ), alpha index (I ), and the exemption level (I ), were estimated to be higher than the recommended value (unity), while the average activity concentrations for the studied samples were higher than recommended levels. In conclusion, we are concerned that disposal of porcelain in the environment might be a significant hazard.
[Mh] Termos MeSH primário: Porcelana Dentária/química
Meio Ambiente
Manufaturas/análise
Radioisótopos/administração & dosagem
Poluentes do Solo/análise
[Mh] Termos MeSH secundário: Porcelana Dentária/análise
Teste de Materiais
Dose de Radiação
Resíduos Radioativos
Radioisótopos/química
Eliminação de Resíduos
Gestão da Segurança
Poluentes do Solo/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Radioactive Waste); 0 (Radioisotopes); 0 (Soil Pollutants); 12001-21-7 (Dental Porcelain)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170818
[Lr] Data última revisão:
170818
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:170131
[St] Status:MEDLINE
[do] DOI:10.1080/09553002.2017.1287453


  8 / 2202 MEDLINE  
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[PMID]:28088094
[Au] Autor:Cho S; Yoon JY
[Ad] Endereço:Department of Agricultural and Biosystems Engineering, The University of Arizona, Tucson, AZ 85721-0038, USA.
[Ti] Título:Organ-on-a-chip for assessing environmental toxicants.
[So] Source:Curr Opin Biotechnol;45:34-42, 2017 Jun.
[Is] ISSN:1879-0429
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Man-made xenobiotics, whose potential toxicological effects are not fully understood, are oversaturating the already-contaminated environment. Due to the rate of toxicant accumulation, unmanaged disposal, and unknown adverse effects to the environment and the human population, there is a crucial need to screen for environmental toxicants. Animal models and in vitro models are ineffective models in predicting in vivo responses due to inter-species difference and/or lack of physiologically-relevant 3D tissue environment. Such conventional screening assays possess limitations that prevent dynamic understanding of toxicants and their metabolites produced in the human body. Organ-on-a-chip systems can recapitulate in vivo like environment and subsequently in vivo like responses generating a realistic mock-up of human organs of interest, which can potentially provide human physiology-relevant models for studying environmental toxicology. Feasibility, tunability, and low-maintenance features of organ-on-chips can also make possible to construct an interconnected network of multiple-organs-on-chip toward a realistic human-on-a-chip system. Such interconnected organ-on-a-chip network can be efficiently utilized for toxicological studies by enabling the study of metabolism, collective response, and fate of toxicants through its journey in the human body. Further advancements can address the challenges of this technology, which potentiates high predictive power for environmental toxicology studies.
[Mh] Termos MeSH primário: Ecotoxicologia/métodos
Poluentes Ambientais/toxicidade
Manufaturas/toxicidade
Microfluídica/métodos
Modelos Biológicos
Xenobióticos/isolamento & purificação
[Mh] Termos MeSH secundário: Animais
Seres Humanos
Modelos Animais
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (Xenobiotics)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170928
[Lr] Data última revisão:
170928
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170115
[St] Status:MEDLINE


  9 / 2202 MEDLINE  
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[PMID]:27894206
[Au] Autor:Mihalache R; Verbeek J; Graczyk H; Murashov V; van Broekhuizen P
[Ad] Endereço:a Finnish Institute of Occupational Health, Cochrane Work Group , Kuopio , Finland.
[Ti] Título:Occupational exposure limits for manufactured nanomaterials, a systematic review.
[So] Source:Nanotoxicology;11(1):7-19, 2017 Feb.
[Is] ISSN:1743-5404
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The toxicological properties of manufactured nanomaterials (MNMs) can be different from their bulk-material and uncertainty remains about the adverse health effects they may have on humans. Proposals for OELs have been put forward which can be useful for risk management and workers' protection. We performed a systematic review of proposals for OELs for MNMs to better understand the extent of such proposals, as well as their derivation methods. METHODS: We searched PubMed and Embase with an extensive search string and also assessed the references in the included studies. Two authors extracted the data independently. RESULTS: We identified 20 studies that proposed in total 56 OEL values. Of these, two proposed a generic level for all MNMs, 14 proposed a generic OEL for a category of MNMs and 40 proposed an OEL for a specific nanomaterial. For specific fibers, four studies proposed a similar value but for carbon nanotubes (CNTs) the values differed with a factor ranging from 30 to 50 and for metals with a factor from 100 to 300. The studies did not provide explanations for this variation. We found that exposure to MNMs measured at selected workplaces may exceed even the highest proposed OEL. This indicates that the application and use of OELs may be useful for exposure reduction. CONCLUSION: OELs can provide a valuable reference point for exposure reduction measures in workplaces. There is a need for more and better supported OELs based on a more systematic approach to OEL derivation.
[Mh] Termos MeSH primário: Manufaturas/análise
Metais/análise
Nanoestruturas/análise
Exposição Ocupacional/análise
Local de Trabalho/normas
[Mh] Termos MeSH secundário: Seres Humanos
Nanotubos de Carbono/análise
Saúde do Trabalhador
Níveis Máximos Permitidos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Metals); 0 (Nanotubes, Carbon)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170623
[Lr] Data última revisão:
170623
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161130
[St] Status:MEDLINE
[do] DOI:10.1080/17435390.2016.1262920


  10 / 2202 MEDLINE  
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[PMID]:27761867
[Au] Autor:Liu J; Guo L; Jiang J; Jiang D; Wang P
[Ad] Endereço:School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China.
[Ti] Título:Emergency material allocation and scheduling for the application to chemical contingency spills under multiple scenarios.
[So] Source:Environ Sci Pollut Res Int;24(1):956-968, 2017 Jan.
[Is] ISSN:1614-7499
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:In the emergency management relevant to chemical contingency spills, efficiency emergency rescue can be deeply influenced by a reasonable assignment of the available emergency materials to the related risk sources. In this study, an emergency material scheduling model (EMSM) with time-effective and cost-effective objectives is developed to coordinate both allocation and scheduling of the emergency materials. Meanwhile, an improved genetic algorithm (IGA) which includes a revision operation for EMSM is proposed to identify the emergency material scheduling schemes. Then, scenario analysis is used to evaluate optimal emergency rescue scheme under different emergency pollution conditions associated with different threat degrees based on analytic hierarchy process (AHP) method. The whole framework is then applied to a computational experiment based on south-to-north water transfer project in China. The results demonstrate that the developed method not only could guarantee the implementation of the emergency rescue to satisfy the requirements of chemical contingency spills but also help decision makers identify appropriate emergency material scheduling schemes in a balance between time-effective and cost-effective objectives.
[Mh] Termos MeSH primário: Acidentes
Tomada de Decisões
Planejamento em Desastres
Manufaturas/provisão & distribuição
Modelos Teóricos
Poluição Química da Água/prevenção & controle
[Mh] Termos MeSH secundário: Algoritmos
China
Simulação por Computador
Planejamento em Desastres/métodos
Planejamento em Desastres/organização & administração
Qualidade da Água
Abastecimento de Água/normas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1703
[Cu] Atualização por classe:171103
[Lr] Data última revisão:
171103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161021
[St] Status:MEDLINE
[do] DOI:10.1007/s11356-016-7811-x



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