Base de dados : MEDLINE
Pesquisa : D01.268.558 [Categoria DeCS]
Referências encontradas : 1571 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 158 ir para página                         

  1 / 1571 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28749812
[Au] Autor:Iwaoka K; Yajima K; Suzuki T; Yonehara H; Hosoda M; Tokonami S; Kanda R
[Ad] Endereço:*National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan; †Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan; ‡National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan; §Hirosaki University Graduate School of Health Sciences, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan.
[Ti] Título:Investigation of Natural Radioactivity in a Monazite Processing Plant in Japan.
[So] Source:Health Phys;113(3):220-224, 2017 09.
[Is] ISSN:1538-5159
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Monazite is a naturally occurring radioactive material that is processed for use in a variety of domestic applications. At present, there is little information available on potential radiation doses experienced by people working with monazite. The ambient dose rate and activity concentration of natural radionuclides in raw materials, products, and dust in work sites as well as the Rn and Rn concentrations in work sites were measured in a monazite processing plant in Japan. Dose estimations for plant workers were also conducted. The activity concentration of the U series in raw materials and products for the monazite processing plant was found to be higher than the relevant values described in the International Atomic Energy Agency Safety Standards. The ambient dose rates in the raw material yard were higher than those in other work sites. Moreover, the activity concentrations of dust in the milling site were higher than those in other work sites. The Rn concentrations in all work sites were almost the same as those in regular indoor environments in Japan. The Rn concentrations in all work sites were much higher than those in regular indoor environments in Japan. The maximum value of the effective dose for workers was 0.62 mSv y, which is lower than the reference level range (1-20 mSv y) for abnormally high levels of natural background radiation published in the International Commission of Radiological Protection Publication 103.
[Mh] Termos MeSH primário: Metais Terras Raras/química
Monitoramento de Radiação
[Mh] Termos MeSH secundário: Radiação de Fundo
Poeira/análise
Seres Humanos
Japão
Radioatividade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Dust); 0 (Metals, Rare Earth); 1306-41-8 (monazite)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:180214
[Lr] Data última revisão:
180214
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170728
[St] Status:MEDLINE
[do] DOI:10.1097/HP.0000000000000692


  2 / 1571 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28945788
[Au] Autor:Li F; Gong A; Qiu L; Zhang W; Li J; Liu Y; Liu Y; Yuan H
[Ad] Endereço:School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, P R, China.
[Ti] Título:Simultaneous determination of trace rare-earth elements in simulated water samples using ICP-OES with TODGA extraction/back-extraction.
[So] Source:PLoS One;12(9):e0185302, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The determination of trace rare-earth elements (REEs) can be used for the assessment of environmental pollution, and is of great significance to the study of toxicity and toxicology in animals and plants. N, N, N', N'-tetraoctyl diglycolamide (TODGA) is an environmental friendly extractant that is highly selective to REEs. In this study, an analytical method was developed for the simultaneous determination of 16 trace REEs in simulated water samples by inductively coupled plasma optical emission spectroscopy (ICP-OES). With this method, TODGA was used as the extractant to perform the liquid-liquid extraction (LLE) sample pretreatment procedure. All 16 REEs were extracted from a 3 M nitric acid medium into an organic phase by a 0.025 M TODGA petroleum ether solution. A 0.03 M ethylenediaminetetraacetic acid disodium salt (EDTA) solution was used for back-extraction to strip the REEs from the organic phase into the aqueous phase. The aqueous phase was concentrated using a vacuum rotary evaporator and the concentration of the 16 REEs was detected by ICP-OES. Under the optimum experimental conditions, the limits of detection (3σ, n = 7) for the REEs ranged from 0.0405 ng mL-1 (Nd) to 0.5038 ng mL-1 (Ho). The relative standard deviations (c = 100 ng mL-1, n = 7) were from 0.5% (Eu) to 4.0% (Tm) with a linear range of 4-1000 ng mL-1 (R2 > 0.999). The recoveries of 16 REEs ranged from 95% to 106%. The LLE-ICP-OES method established in this study has the advantages of simple operation, low detection limits, fast analysis speed and the ability to simultaneously determine 16 REEs, thereby acting as a viable alternative for the simultaneous detection of trace amounts of REEs in water samples.
[Mh] Termos MeSH primário: Metais Terras Raras/análise
Oligoelementos/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Monitoramento Ambiental/métodos
Glicolatos
Limite de Detecção
Extração Líquido-Líquido/métodos
Espectrofotometria/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Glycolates); 0 (Metals, Rare Earth); 0 (Trace Elements); 0 (Water Pollutants, Chemical); 0 (tetra-n-octyldiglycolamide)
[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:170926
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0185302


  3 / 1571 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28783022
[Au] Autor:Vahidi E; Zhao F
[Ad] Endereço:Environmental and Ecological Engineering, Purdue University, West Lafayette, IN 47907, United States; Ecological Sciences and Engineering Interdisciplinary Graduate Program, Purdue University, West Lafayette, IN 47907, United States. Electronic address: evahidim@purdue.edu.
[Ti] Título:Environmental life cycle assessment on the separation of rare earth oxides through solvent extraction.
[So] Source:J Environ Manage;203(Pt 1):255-263, 2017 Dec 01.
[Is] ISSN:1095-8630
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Over the past decade, Rare Earth Elements (REEs) have gained special interests due to their significance in many industrial applications, especially those related to clean energy. While REEs production is known to cause damage to the ecosystem, only a handful of Life Cycle Assessment (LCA) investigations have been conducted in recent years, mainly due to lack of data and information. This is especially true for the solvent extraction separation of REEs from aqueous solution which is a challenging step in the REEs production route. In the current investigation, an LCA is carried out on a typical REE solvent extraction process using P204/kerosene and the energy/material flows and emissions data were collected from two different solvent extraction facilities in Inner Mongolia and Fujian provinces in China. In order to develop life cycle inventories, Ecoinvent 3 and SimaPro 8 software together with energy/mass stoichiometry and balance were utilized. TRACI and ILCD were applied as impact assessment tools and LCA outcomes were employed to examine and determine ecological burdens of the REEs solvent extraction operation. Based on the results, in comparison with the production of generic organic solvent in the Ecoinvent dataset, P204 production has greater burdens on all TRACI impact categories. However, due to the small amount of consumption, the contribution of P204 remains minimal. Additionally, sodium hydroxide and hydrochloric acid are the two impactful chemicals on most environmental categories used in the solvent extraction operation. On average, the solvent extraction step accounts for 30% of the total environmental impacts associated with individual REOs. Finally, opportunities and challenges for an enhanced environmental performance of the REEs solvent extraction operation were investigated.
[Mh] Termos MeSH primário: Meio Ambiente
Metais Terras Raras
[Mh] Termos MeSH secundário: China
Óxidos
Solventes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Metals, Rare Earth); 0 (Oxides); 0 (Solvents)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171113
[Lr] Data última revisão:
171113
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170808
[St] Status:MEDLINE


  4 / 1571 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28709038
[Au] Autor:Parisi MG; Cammarata I; Cammarata M; Censi V
[Ad] Endereço:DISTEM Department, University of Palermo, Via Archirafi 22, 90123 Palermo, Italy. Electronic address: mariagiovanna.parisi@unipa.it.
[Ti] Título:Rare earths, zirconium and hafnium distribution in coastal areas: The example of Sabella spallanzanii (Gmelin, 1791).
[So] Source:Chemosphere;185:268-276, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The Zr, Hf, Y and lanthanide (REE) distribution in biological tissues of Sabella spallanzanii and Styela plicata species collected from two harbours from the northern Sicily is studied for providing information regarding the Zr, Hf and REE uptake from the environment. Previous studies determined the fractionation of dissolved REE scavenged on binding sites onto biological surfaces. By comparing the recognised shale-normalised REE patterns of studied samples with evidence from reference data, the observed behaviour of these elements in biological tissues of Sabella spallanzanii and Styela plicata is interpreted to result from the preferential uptake of intermediate REE onto carboxylic sites. Moreover, the relationship observed between the Fe content and Zr/Hf ratio suggests that preferential Hf accumulation occurs via siderophore-like binding sites. Features of the REE bioaccumulation factors (BAF), in addition to the absolute La, Ce and Sm contents and Zr-Hf fractionation, allow definition of the different origins of studied elements in the investigated localities. Higher BAF values for La and Ce associated with larger REE contents and lower Zr/Hf values strongly suggest that the environmental REE distribution in the Termini Imerese harbour is influenced by the delivery of particles from industrial sources and power plants. On the contrary, the REE contents of biological tissues collected in the Cala tourist harbour are affected by the dust dissolution from automotive traffic. These results suggest that the geochemical behaviour of REE and Zr/Hf signature can be used in environmental studies of biological tissues for reconstructing the nature of anthropogenic contaminations.
[Mh] Termos MeSH primário: Monitoramento Ambiental/métodos
Háfnio/análise
Metais Terras Raras/análise
Poliquetos/química
Zircônio/análise
[Mh] Termos MeSH secundário: Animais
Poeira
Sicília
Distribuição Tecidual
Emissões de Veículos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Dust); 0 (Metals, Rare Earth); 0 (Vehicle Emissions); C6V6S92N3C (Zirconium); X71938L1DO (Hafnium)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170715
[St] Status:MEDLINE


  5 / 1571 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28651813
[Au] Autor:Nachev P; Rose GE; Verity DH; Manohar SG; MacKenzie K; Adams G; Theodorou M; Pankhurst QA; Kennard C
[Ad] Endereço:Institute of Neurology, University College London, London, United Kingdom. Electronic address: p.nachev@ucl.ac.uk.
[Ti] Título:Magnetic Oculomotor Prosthetics for Acquired Nystagmus.
[So] Source:Ophthalmology;124(10):1556-1564, 2017 Oct.
[Is] ISSN:1549-4713
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PURPOSE: Acquired nystagmus, a highly symptomatic consequence of damage to the substrates of oculomotor control, often is resistant to pharmacotherapy. Although heterogeneous in its neural cause, its expression is unified at the effector-the eye muscles themselves-where physical damping of the oscillation offers an alternative approach. Because direct surgical fixation would immobilize the globe, action at a distance is required to damp the oscillation at the point of fixation, allowing unhindered gaze shifts at other times. Implementing this idea magnetically, herein we describe the successful implantation of a novel magnetic oculomotor prosthesis in a patient. DESIGN: Case report of a pilot, experimental intervention. PARTICIPANT: A 49-year-old man with longstanding, medication-resistant, upbeat nystagmus resulting from a paraneoplastic syndrome caused by stage 2A, grade I, nodular sclerosing Hodgkin's lymphoma. METHODS: We designed a 2-part, titanium-encased, rare-earth magnet oculomotor prosthesis, powered to damp nystagmus without interfering with the larger forces involved in saccades. Its damping effects were confirmed when applied externally. We proceeded to implant the device in the patient, comparing visual functions and high-resolution oculography before and after implantation and monitoring the patient for more than 4 years after surgery. MAIN OUTCOME MEASURES: We recorded Snellen visual acuity before and after intervention, as well as the amplitude, drift velocity, frequency, and intensity of the nystagmus in each eye. RESULTS: The patient reported a clinically significant improvement of 1 line of Snellen acuity (from 6/9 bilaterally to 6/6 on the left and 6/5-2 on the right), reflecting an objectively measured reduction in the amplitude, drift velocity, frequency, and intensity of the nystagmus. These improvements were maintained throughout a follow-up of 4 years and enabled him to return to paid employment. CONCLUSIONS: This work opens a new field of implantable therapeutic devices-oculomotor prosthetics-designed to modify eye movements dynamically by physical means in cases where a purely neural approach is ineffective. Applied to acquired nystagmus refractory to all other interventions, it is shown successfully to damp pathologic eye oscillations while allowing normal saccadic shifts of gaze.
[Mh] Termos MeSH primário: Campos Magnéticos
Nistagmo Patológico/cirurgia
Músculos Oculomotores/cirurgia
Próteses e Implantes
[Mh] Termos MeSH secundário: Movimentos Oculares/fisiologia
Seres Humanos
Masculino
Metais Terras Raras
Meia-Idade
Nistagmo Patológico/fisiopatologia
Músculos Oculomotores/fisiopatologia
Desenho de Prótese
Implante de Prótese
Visão Ocular/fisiologia
Acuidade Visual/fisiologia
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Metals, Rare Earth)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171002
[Lr] Data última revisão:
171002
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170628
[St] Status:MEDLINE


  6 / 1571 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28633065
[Au] Autor:Graney JR; Landis MS; Puckett KJ; Studabaker WB; Edgerton ES; Legge AH; Percy KE
[Ad] Endereço:Department of Geological Sciences, Binghamton University, Binghamton, NY 13902, USA. Electronic address: jgraney@binghamton.edu.
[Ti] Título:Differential accumulation of PAHs, elements, and Pb isotopes by five lichen species from the Athabasca Oil Sands Region in Alberta, Canada.
[So] Source:Chemosphere;184:700-710, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A 2014 case study investigated the relative accumulation efficiency of polycyclic aromatic hydrocarbons (PAHs), total sulfur (S), total nitrogen (N), major and minor elements and Pb isotopes in five common lichen species at three boreal forest sites in the Athabasca Oil Sands Region (AOSR) in northeastern Alberta, Canada to identify the optimum lichen species for future biomonitoring. Differences in concentrations of PAHs, multiple elements, and Pb isotopes in fruticose (Bryoria furcellata, Cladina mitis, Evernia mesomorpha) and foliose (Hypogymnia physodes and Tuckermannopsis americana) lichens were found along a 100 km distance gradient from the primary oil sands operations. Integration of insights from emission source samples and oil sands mineralogy in consort with aerosol collection indicates incorporation of more fine particulate matter (PM) into foliose than fruticose lichen biomass. Contrasting PAH with element concentrations allowed lichen species specific accumulation patterns to be identified. The ability of lichen species to incorporate different amounts of gas phase (S and N), petrogenic (V, Ni, Mo), clay (low Si/Al and more rare earth elements), and sand (higher Si/Al and Ti) components from the oil sand operations reflects aerosol particle size and lichen physiology differences that translate into differences in PM transport distances and lichen accumulation efficiencies. Based on these findings Hypogymnia physodes is recommended for future PAH biomonitoring and source attribution studies.
[Mh] Termos MeSH primário: Monitoramento Ambiental
Poluentes Ambientais/análise
Chumbo/análise
Líquens/classificação
Metais Terras Raras/análise
Hidrocarbonetos Aromáticos Policíclicos/análise
[Mh] Termos MeSH secundário: Alberta
Isótopos
Nitrogênio
Campos de Petróleo e Gás
Tamanho da Partícula
Material Particulado
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (Isotopes); 0 (Metals, Rare Earth); 0 (Particulate Matter); 0 (Polycyclic Aromatic Hydrocarbons); 2P299V784P (Lead); N762921K75 (Nitrogen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170621
[St] Status:MEDLINE


  7 / 1571 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28628904
[Au] Autor:Khan AM; Behkami S; Yusoff I; Md Zain SB; Bakar NKA; Bakar AFA; Alias Y
[Ad] Endereço:Department of Geology, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia. Electronic address: ayshamasood07@gmail.com.
[Ti] Título:Geochemical characteristics of rare earth elements in different types of soil: A chemometric approach.
[So] Source:Chemosphere;184:673-678, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Rare earth elements (REEs) are becoming significant due to their huge applications in many industries, large-scale mining and refining activities. Increasing usage of such metals pose negative environmental impacts. In this research ICP-MS has been used to analyze soil samples collected from former ex-mining areas in the depths of 0-20 cm, 21-40 cm, and 41-60 cm of residential, mining, natural, and industrial areas of Perak. Principal component analysis (PCA) revealed that soil samples taken from different mining, industrial, residential, and natural areas are separated into four clusters. It was observed that REEs were abundant in most of the samples from mining areas. Concentration of the rare elements decrease in general as we move from surface soil to deeper soils.
[Mh] Termos MeSH primário: Monitoramento Ambiental
Metais Terras Raras/análise
Poluentes do Solo/análise
Solo/química
[Mh] Termos MeSH secundário: Mineração
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Metals, Rare Earth); 0 (Soil); 0 (Soil Pollutants)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170620
[St] Status:MEDLINE


  8 / 1571 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28623799
[Au] Autor:Milicevic T; Anicic Urosevic M; Vukovic G; Skrivanj S; Relic D; Frontasyeva MV; Popovic A
[Ad] Endereço:Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia.
[Ti] Título:Assessment of species-specific and temporal variations of major, trace and rare earth elements in vineyard ambient using moss bags.
[So] Source:Ecotoxicol Environ Saf;144:208-215, 2017 Oct.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Since the methodological parameters of moss bag biomonitoring have rarely been investigated for the application in agricultural areas, two mosses, Sphagnum girgensohnii (a species of the most recommended biomonitoring genus) and Hypnum cupressiforme (commonly available), were verified in a vineyard ambient. The moss bags were exposed along transects in six vineyard parcels during the grapevine season (March‒September 2015). To select an appropriate period for the reliable 'signal' of the element enrichment in the mosses, the bags were simultaneously exposed during five periods (3 × 2 months, 1 × 4 months, and 1 × 6 months). Assuming that vineyard is susceptible to contamination originated from different agricultural treatments, a wide range of elements (41) were determined in the moss and topsoil samples. The mosses were significantly enriched by the elements during the 2-month bag exposure which gradually increasing up to 6 months, but Cu and Ni exhibited the noticeable fluctuations during the grapevine season. However, the 6-month exposure of moss bags could be recommended for comparative studies among different vineyards because it reflects the ambient pollution comprising unpredictable treatments of grapevine applied during the whole season. Although higher element concentrations were determined in S. girgensohnii than H. cupressiforme, both species reflected the spatio-temporal changes in the ambient element content. Moreover, the significant correlation of the element (Cr, Cu, Sb, and Ti) concentrations between the mosses, and the same pairs of the elements correlated within the species, imply the comparable use of S. girgensohnii and H. cupressiforme in the vineyard (agricultural) ambient. Finally, both the moss bags and the soil analyses suggest that vineyard represents a dominant diffuse pollution source of As, Cr, Cu, Ni, Fe, and V.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/análise
Bryopsida/química
Monitoramento Ambiental/métodos
Metais Terras Raras/análise
Sphagnopsida/química
Oligoelementos/análise
[Mh] Termos MeSH secundário: Fazendas
Estações do Ano
Sérvia
Especificidade da Espécie
Vitis/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Metals, Rare Earth); 0 (Trace Elements)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171110
[Lr] Data última revisão:
171110
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170618
[St] Status:MEDLINE


  9 / 1571 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28564624
[Au] Autor:Turetta C; Barbaro E; Capodaglio G; Barbante C
[Ad] Endereço:Institute for the Dynamics of Environmental Processes-CNR, Via Torino 155, 30172, Venice, Italy. Electronic address: clara.turetta@idpa.cnr.it.
[Ti] Título:Dissolved rare earth elements in the central-western sector of the Ross Sea, Southern Ocean: Geochemical tracing of seawater masses.
[So] Source:Chemosphere;183:444-453, 2017 Sep.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The present essay contributes to the existing literature on rare earth elements (REEs) in the southern hemisphere by presenting the first data, to our knowledge, on the vertical profiles of dissolved REEs in 71 samples collected in the central-western sector of the Ross Sea (Southern Ocean-SO). The REEs were measured in the water samples collected during the 2002-2003 and 2005-2006 austral summers. 4 samples were collected and analysed in the framework of a test experiment, as part of the WISSARD Project (Whillans Ice Stream Subglacial Access Research Drilling). Our results show significant differences between the REE patterns of the main water masses present in the SO: we could observe specific signature in the High Salinity Shelf Water (HSSW), Ice Shelf Water (ISW) and Low Salinity Shelf Water (LSSW). A significant increase in Terbium (Tb) concentration was observed in the HSSW and ISW, the two principal water masses contributing to the formation of Antarctic Bottom Water (AABW) in the Ross Sea area, and in LSSW. Some of the HSSW samples show enrichment in Neodymium (Nd). Dissolved REE could therefore be used as tracers to understand the deep circulation of the SO (Pacific sector). We hypothesize that: (I) the characteristic dissolved REE pattern may derive from the composition of source area and from the hydrothermal activity of the central-western area of the Ross Sea; (II) the Tb anomaly observed in the AABW on the South Australian platform could be partially explained by the contribution of AABW generated in the Ross Sea region.
[Mh] Termos MeSH primário: Metais Terras Raras/análise
Salinidade
Água do Mar/química
[Mh] Termos MeSH secundário: Regiões Antárticas
Austrália
Fontes Hidrotermais/química
Gelo
Neodímio/análise
Oceanos e Mares
Estações do Ano
Térbio/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ice); 0 (Metals, Rare Earth); 06SSF7P179 (Terbium); 2I87U3734A (Neodymium)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170929
[Lr] Data última revisão:
170929
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170601
[St] Status:MEDLINE


  10 / 1571 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28476009
[Au] Autor:Wang L; He J; Xia A; Cheng M; Yang Q; Du C; Wei H; Huang X; Zhou Q
[Ad] Endereço:Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210046, China; State Key Laboratory of Food Science and Technology, Jiangsu Key Laboratory of Anae
[Ti] Título:Toxic effects of environmental rare earth elements on delayed outward potassium channels and their mechanisms from a microscopic perspective.
[So] Source:Chemosphere;181:690-698, 2017 Aug.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The wide applications cause a large amount of rare earth elements (REEs) to be released into the environment, and ultimately into the human body through food chain. Toxic effects of REEs on humans have been extensively studied, but their toxic effects and binding targets in cells are not understood. Delayed outward potassium channels (K channels) are good targets for exogenous substances or clinical drugs. To evaluate cellular toxicities of REEs and clarify toxic mechanisms, the toxicities of REEs on the K channel and their structural basis were investigated. The results showed that delayed outward potassium channels on the plasma membrane are the targets of REEs acting on living organisms, and the changes in the thermodynamic and kinetic characteristics of the K channel are the reasons of diseases induced by REEs. Two types of REEs, a light REE La and a heavy REE Tb , displayed different intensity of toxicities on the K channel, in which the toxicity of Tb was stronger than that of La . More interestingly, in comparison with that of heavy metal Cd , the cytotoxicities of the light and heavy REEs showed discriminative differences, and the cytotoxicity of Tb was higher than that of Cd , while the cytotoxicity of La was lower than that of Cd . These different cytotoxicities of La , Tb and Cd on human resulted from the varying binding abilities of the metals to this channel protein.
[Mh] Termos MeSH primário: Canal de Potássio ERG1/efeitos dos fármacos
Metais Terras Raras/toxicidade
[Mh] Termos MeSH secundário: Cádmio/metabolismo
Cádmio/toxicidade
Membrana Celular/metabolismo
Meio Ambiente
Células HEK293
Seres Humanos
Lantânio/metabolismo
Lantânio/toxicidade
Metais Pesados/metabolismo
Metais Terras Raras/química
Ligação Proteica
Térbio/metabolismo
Térbio/toxicidade
Transfecção
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (ERG1 Potassium Channel); 0 (KCNH2 protein, human); 0 (Metals, Heavy); 0 (Metals, Rare Earth); 00BH33GNGH (Cadmium); 06SSF7P179 (Terbium); 6I3K30563S (Lanthanum)
[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:170506
[St] Status:MEDLINE



página 1 de 158 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde