Base de dados : MEDLINE
Pesquisa : G16.500.175.249 [Categoria DeCS]
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[PMID]:28888241
[Au] Autor:Fan Y; Hunt JCR; Li Y
[Ad] Endereço:Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China. Electronic address: u3002019@connect.hku.hk.
[Ti] Título:Buoyancy and turbulence-driven atmospheric circulation over urban areas.
[So] Source:J Environ Sci (China);59:63-71, 2017 Sep.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In the buoyancy and turbulence-driven atmospheric circulations (BTDAC) that occur over urban areas where the approach means wind speeds are very low (less than turbulent fluctuations and typically <3m/sec), the surface temperatures are significantly higher than those in the external rural areas, and the atmosphere above the mixing layer is stably stratified. In this paper, the mechanisms of BTDAC formation are studied through laboratory experiments and modelling, with additional low-level inflow from external rural areas and a divergent outflow in the opposite direction in the upper part of the mixed layer. Strong turbulent plumes in the central region mix the flow between lower and higher levels up to the inversion height. There are shear-driven turbulent eddies and weaker buoyant plumes around the periphery of the urban area. As the approach flow is very weak, the recirculating streamlines within the dome restrict the ventilation, and the dispersion of pollution emitted from sources below the inversion height leading to a rise in the mean concentration. Low-level air entrained from rural areas can, however, improve ventilation and lower this concentration. This trend can also be improved if the recirculating structure of the BTDAC flow pattern over urban areas breaks down as a result of the surface temperature distribution not being symmetrical, or as the approach wind speed increases to a level comparable with the mean velocity of circulation, or (except near the equator) the urban area is large enough that the Coriolis acceleration is significant.
[Mh] Termos MeSH primário: Movimentos do Ar
Poluentes Atmosféricos/análise
Atmosfera/química
Monitoramento Ambiental
[Mh] Termos MeSH secundário: Modelos Químicos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170911
[St] Status:MEDLINE


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[PMID]:28663397
[Au] Autor:Bloch BV; Shah A; Snape SE; Boswell TCJ; James PJ
[Ad] Endereço:Nottingham University Hospitals NHS Trust, City Hospital Campus, Hucknall Road, Nottingham NG5 1PB, UK.
[Ti] Título:Primary hip and knee arthroplasty in a temporary operating theatre is associated with a significant increase in deep periprosthetic infection.
[So] Source:Bone Joint J;99-B(7):917-920, 2017 Jul.
[Is] ISSN:2049-4408
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:AIMS: Infection following total hip or knee arthroplasty is a serious complication. We noted an increase in post-operative infection in cases carried out in temporary operating theatres. We therefore compared those cases performed in standard and temporary operating theatres and examined the deep periprosthetic infection rates. PATIENTS AND METHODS: A total of 1223 primary hip and knee arthroplasties were performed between August 2012 and June 2013. A total of 539 (44%) were performed in temporary theatres. The two groups were matched for age, gender, body mass index and American Society of Anesthesiologists grade. RESULTS: The deep infection rate for standard operating theatres was 0 of 684 (0%); for temporary theatres it was eight of 539 (1.5%) (p = 0.001). CONCLUSION: Use of a temporary operating theatre for primary hip and knee arthroplasty was associated with an unacceptable increase in deep infection. We do not advocate the use of these theatres for primary joint arthroplasty. Cite this article: 2017;99-B:917-20.
[Mh] Termos MeSH primário: Artroplastia de Quadril
Artroplastia do Joelho
Infecção Hospitalar/epidemiologia
Salas Cirúrgicas
Infecções Relacionadas à Prótese/epidemiologia
Infecção da Ferida Cirúrgica/epidemiologia
[Mh] Termos MeSH secundário: Movimentos do Ar
Contaminação de Equipamentos
Seres Humanos
Estudos Retrospectivos
Fatores de Risco
Reino Unido/epidemiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170828
[Lr] Data última revisão:
170828
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:170701
[St] Status:MEDLINE
[do] DOI:10.1302/0301-620X.99B7.BJJ-2016-1293.R1


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[PMID]:28391119
[Au] Autor:Eusebi AL; Bellezze T; Chiappini G; Sasso M; Battistoni P
[Ad] Endereço:Dipartimento SIMAU, Facoltà di Ingegneria, Università Politecnica delle Marche, Via Brecce Bianche, 12, 60100, Ancona, Italy. Electronic address: a.l.eusebi@univpm.it.
[Ti] Título:Influence of aeration cycles on mechanical characteristics of elastomeric diffusers in biological intermittent processes: Accelerated tests in real environment.
[So] Source:Water Res;117:143-156, 2017 Jun 15.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The paper deals with the evaluation of the effect of on/off switching of diffuser membranes, in the intermittent aeration process of the urban wastewater treatments. Accelerated tests were done using two types of commercial EPDM diffusers, which were submitted to several consecutive cycles up to the simulation of more than 8 years of real working conditions. The effect of this switching on the mechanical characteristics of the membranes was evaluated in terms of pressure increment of the air operating at different flow rates (2, 3.5 and 6 m /h/diff): during accelerated tests, such increment ranged from 2% to 18%. The intermittent phases emphasized the loss both of the original mechanical proprieties of the diffusers and of the initial pore shapes. The main cause of pressure increment was attributed to the fouling of the internal channels of the pores. Further analyses performed by scanning electron microscopy and by mechanical tests on EPDM membrane, using a traditional tensile test and a non destructive optical method, from which the Young's Modulus was obtained, supported previous conclusions. Any changes in terms of oxygen transfer parameters (KLa and SOTE%) were specifically founded by causing to the repeated on/off switching.
[Mh] Termos MeSH primário: Eliminação de Resíduos Líquidos
Águas Residuais
[Mh] Termos MeSH secundário: Movimentos do Ar
Reatores Biológicos
Difusão
Oxigênio
Pressão
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Waste Water); S88TT14065 (Oxygen)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170505
[Lr] Data última revisão:
170505
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170410
[St] Status:MEDLINE


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[PMID]:28355184
[Au] Autor:Bomphrey RJ; Nakata T; Phillips N; Walker SM
[Ad] Endereço:Structure and Motion Laboratory, Royal Veterinary College, University of London, Hatfield AL9 7TA, UK.
[Ti] Título:Smart wing rotation and trailing-edge vortices enable high frequency mosquito flight.
[So] Source:Nature;544(7648):92-95, 2017 04 06.
[Is] ISSN:1476-4687
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Mosquitoes exhibit unusual wing kinematics; their long, slender wings flap at remarkably high frequencies for their size (>800 Hz)and with lower stroke amplitudes than any other insect group. This shifts weight support away from the translation-dominated, aerodynamic mechanisms used by most insects, as well as by helicopters and aeroplanes, towards poorly understood rotational mechanisms that occur when pitching at the end of each half-stroke. Here we report free-flight mosquito wing kinematics, solve the full Navier-Stokes equations using computational fluid dynamics with overset grids, and validate our results with in vivo flow measurements. We show that, although mosquitoes use familiar separated flow patterns, much of the aerodynamic force that supports their weight is generated in a manner unlike any previously described for a flying animal. There are three key features: leading-edge vortices (a well-known mechanism that appears to be almost ubiquitous in insect flight), trailing-edge vortices caused by a form of wake capture at stroke reversal, and rotational drag. The two new elements are largely independent of the wing velocity, instead relying on rapid changes in the pitch angle (wing rotation) at the end of each half-stroke, and they are therefore relatively immune to the shallow flapping amplitude. Moreover, these mechanisms are particularly well suited to high aspect ratio mosquito wings.
[Mh] Termos MeSH primário: Culex/anatomia & histologia
Culex/fisiologia
Voo Animal/fisiologia
Rotação
Asas de Animais/anatomia & histologia
Asas de Animais/fisiologia
[Mh] Termos MeSH secundário: Movimentos do Ar
Animais
Fenômenos Biomecânicos
Hidrodinâmica
Masculino
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171005
[Lr] Data última revisão:
171005
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170330
[St] Status:MEDLINE
[do] DOI:10.1038/nature21727


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[PMID]:28314235
[Au] Autor:Zivan O; Bohbot-Raviv Y; Dubowski Y
[Ad] Endereço:Faculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa, Israel. Electronic address: zivan@campus.technion.ac.il.
[Ti] Título:Primary and secondary pesticide drift profiles from a peach orchard.
[So] Source:Chemosphere;177:303-310, 2017 Jun.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Atmospheric drift is considered a major loss path of pesticide from target areas, but there is still a large gap of knowledge regarding this complex phenomenon. Pesticide drift may occur during application (Primary drift) and after it (Secondary drift). The present study focuses on primary and secondary drift from ground applications in peach orchard (tree height of 3 m), under Mediterranean climate. Detailed and prolonged vertical drift profiles at close proximity to orchard are presented, together with detailed measurements of key meteorological parameters. The effect of volatility on drift was also studied by simultaneously applying two pesticides that differ in their volatility. Drifting airborne pesticides were detected both during and after applications at sampling distances of 7 and 20 m away from orchard edge. Concentrations ranged between hundreds ng m to a few µg m and showed clear decrease with time and with upwind conditions. Almost no decline in concentrations with height was observed up to thrice canopy height (i.e., 10 m). These homogeneous profiles indicate strong mixing near orchard and are in line with the unstable atmospheric conditions that prevailed during measurements. While air concentrations during pesticide application were higher than after it, overall pesticide load drifted from the orchard during primary and secondary drift are comparable. To the best of our knowledge this is the first work to show such large vertical dispersion and long duration of secondary drift following ground application in orchards. The obtained information indicates that secondary drift should not be neglected in exposure and environmental impact estimations.
[Mh] Termos MeSH primário: Agricultura/métodos
Poluentes Atmosféricos/análise
Meio Ambiente
Praguicidas/análise
[Mh] Termos MeSH secundário: Movimentos do Ar
Clima
Monitoramento Ambiental/métodos
Região do Mediterrâneo
Meteorologia
Nitrilos/análise
Prunus persica
Compostos de Espiro/análise
Árvores
Triazóis/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Nitriles); 0 (Pesticides); 0 (Spiro Compounds); 0 (Triazoles); B6T1JTM6KZ (systhane); OUT5YHB7BO (spiroxamine)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170318
[St] Status:MEDLINE


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[PMID]:28214192
[Au] Autor:Wu CD; Chen YC; Pan WC; Zeng YT; Chen MJ; Guo YL; Lung SC
[Ad] Endereço:Department of Forestry and Natural Resources, National Chiayi University, Chiayi, Taiwan; Center for Health and the Global Environment, Harvard T.H. Chan School of Public Health, Boston, United States.
[Ti] Título:Land-use regression with long-term satellite-based greenness index and culture-specific sources to model PM spatial-temporal variability.
[So] Source:Environ Pollut;224:148-157, 2017 May.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:This study utilized a long-term satellite-based vegetation index, and considered culture-specific emission sources (temples and Chinese restaurants) with Land-use Regression (LUR) modelling to estimate the spatial-temporal variability of PM using data from Taipei metropolis, which exhibits typical Asian city characteristics. Annual average PM concentrations from 2006 to 2012 of 17 air quality monitoring stations established by Environmental Protection Administration of Taiwan were used for model development. PM measurements from 2013 were used for external data verification. Monthly Normalized Difference Vegetation Index (NDVI) images coupled with buffer analysis were used to assess the spatial-temporal variations of greenness surrounding the monitoring sites. The distribution of temples and Chinese restaurants were included to represent the emission contributions from incense and joss money burning, and gas cooking, respectively. Spearman correlation coefficient and stepwise regression were used for LUR model development, and 10-fold cross-validation and external data verification were applied to verify the model reliability. The results showed a strongly negative correlation (r: -0.71 to -0.77) between NDVI and PM while temples (r: 0.52 to 0.66) and Chinese restaurants (r: 0.31 to 0.44) were positively correlated to PM concentrations. With the adjusted model R of 0.89, a cross-validated adj-R of 0.90, and external validated R of 0.83, the high explanatory power of the resultant model was confirmed. Moreover, the averaged NDVI within a 1750 m circular buffer (p < 0.01), the number of Chinese restaurants within a 1750 m buffer (p < 0.01), and the number of temples within a 750 m buffer (p = 0.06) were selected as important predictors during the stepwise selection procedures. According to the partial R , NDVI explained 66% of PM variation and was the dominant variable in the developed model. We suggest future studies consider these three factors when establishing LUR models for estimating PM in other Asian cities.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/análise
Cidades
Monitoramento Ambiental/métodos
Material Particulado/análise
Imagens de Satélites
Análise Espaço-Temporal
[Mh] Termos MeSH secundário: Movimentos do Ar
Culinária
Monitoramento Ambiental/normas
Sistemas de Informação Geográfica
Modelos Teóricos
Análise de Regressão
Reprodutibilidade dos Testes
Restaurantes
Taiwan
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Particulate Matter)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170809
[Lr] Data última revisão:
170809
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170219
[St] Status:MEDLINE


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[PMID]:28207853
[Au] Autor:Leelossy Á; Mészáros R; Kovács A; Lagzi I; Kovács T
[Ad] Endereço:Department of Meteorology, Eötvös Loránd University, Budapest, Hungary.
[Ti] Título:Numerical simulations of atmospheric dispersion of iodine-131 by different models.
[So] Source:PLoS One;12(2):e0172312, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Nowadays, several dispersion models are available to simulate the transport processes of air pollutants and toxic substances including radionuclides in the atmosphere. Reliability of atmospheric transport models has been demonstrated in several recent cases from local to global scale; however, very few actual emission data are available to evaluate model results in real-life cases. In this study, the atmospheric dispersion of 131I emitted to the atmosphere during an industrial process was simulated with different models, namely the WRF-Chem Eulerian online coupled model and the HYSPLIT and the RAPTOR Lagrangian models. Although only limited data of 131I detections has been available, the accuracy of modeled plume direction could be evaluated in complex late autumn weather situations. For the studied cases, the general reliability of models has been demonstrated. However, serious uncertainties arise related to low level inversions, above all in case of an emission event on 4 November 2011, when an important wind shear caused a significant difference between simulated and real transport directions. Results underline the importance of prudent interpretation of dispersion model results and the identification of weather conditions with a potential to cause large model errors.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/análise
Poluição do Ar/análise
Atmosfera/química
Simulação por Computador
Radioisótopos do Iodo/análise
Modelos Teóricos
Monitoramento de Radiação
[Mh] Termos MeSH secundário: Movimentos do Ar
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Iodine Radioisotopes)
[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:170217
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172312


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[PMID]:28186210
[Au] Autor:Reichman R; Shirazi E; Colliver DG; Pennell KG
[Ad] Endereço:University of Kentucky, Department of Civil Engineering, Lexington, KY 40506, USA. kellypennell@uky.edu.
[Ti] Título:US residential building air exchange rates: new perspectives to improve decision making at vapor intrusion sites.
[So] Source:Environ Sci Process Impacts;19(2):87-100, 2017 Feb 22.
[Is] ISSN:2050-7895
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Vapor intrusion (VI) is well-known to be difficult to characterize because indoor air (IA) concentrations exhibit considerable temporal and spatial variability in homes throughout impacted communities. To overcome this and other limitations, most VI science has focused on subsurface processes; however there is a need to understand the role of aboveground processes, especially building operation, in the context of VI exposure risks. This tutorial review focuses on building air exchange rates (AERs) and provides a review of literature related building AERs to inform decision making at VI sites. Commonly referenced AER values used by VI regulators and practitioners do not account for the variability in AER values that have been published in indoor air quality studies. The information presented herein highlights that seasonal differences, short-term weather conditions, home age and air conditioning status, which are well known to influence AERs, are also likely to influence IA concentrations at VI sites. Results of a 3D VI model in combination with relevant AER values reveal that IA concentrations can vary more than one order of magnitude due to air conditioning status and one order of magnitude due to house age. Collectively, the data presented strongly support the need to consider AERs when making decisions at VI sites.
[Mh] Termos MeSH primário: Movimentos do Ar
Poluição do Ar em Ambientes Fechados
Modelos Teóricos
[Mh] Termos MeSH secundário: Tomada de Decisões
Gases
Habitação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Gases)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170512
[Lr] Data última revisão:
170512
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170211
[St] Status:MEDLINE
[do] DOI:10.1039/c6em00504g


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[PMID]:28177350
[Au] Autor:Gunter SA; Bradford JA; Moffet CA
[Ti] Título:Effects of mass airflow rate through an open-circuit gas quantification system when measuring carbon emissions.
[So] Source:J Anim Sci;95(1):475-484, 2017 Jan.
[Is] ISSN:1525-3163
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Methane (CH) and carbon dioxide (CO) represent 11 and 81%, respectively, of all anthropogenic greenhouse gas emissions. Agricultural CH emissions account for approximately 43% of all anthropogenic CH emissions. Most agricultural CH emissions are attributed to enteric fermentation within ruminant livestock; hence, the heightened interest in quantifying and mitigating this source. The automated, open-circuit gas quantification system (GQS; GreenFeed, C-Lock, Inc., Rapid City, SD) evaluated here can be placed in a pasture with grazing cattle and can measure their CH and CO emissions with spot sampling. However, improper management of the GQS can have an erroneous effect on emission estimates. One factor affecting the quality of emission estimates is the airflow rates through the GQS to ensure a complete capture of the breath cloud emitted by the animal. It is hypothesized that at lower airflow rates this cloud will be incompletely captured. To evaluate the effect of airflow rate through the GQS on emission estimates, a data set was evaluated with 758 CO and CH emission estimates with a range in airflows of 10.7 to 36.6 L/s. When airflow through the GQS was between 26.0 and 36.6 L/s, CO and CH emission estimates were not affected ( = 0.14 and 0.05, respectively). When airflow rates were less than 26.0 L/s, CO and CH emission estimates were lower and decreased as airflow rate decreased ( < 0.0001). We hypothesize that when airflow through the GQS decreases below 26 L/s, breath capture was incomplete and CO and CH emissions are underestimated. Maintaining mass airflow through a GQS at rates greater than 26 L/s is important for producing high quality CO and CH emission estimates.
[Mh] Termos MeSH primário: Carbono/química
Bovinos/metabolismo
Gases/química
[Mh] Termos MeSH secundário: Movimentos do Ar
Animais
Carbono/metabolismo
Fermentação
Metano
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Gases); 7440-44-0 (Carbon); OP0UW79H66 (Methane)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170412
[Lr] Data última revisão:
170412
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170209
[St] Status:MEDLINE
[do] DOI:10.2527/jas.2016.0933


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[PMID]:28170468
[Ti] Título:The Medical Aspects of the Modern "Sky Scraper".
[So] Source:JAMA;317(5):540, 2017 02 07.
[Is] ISSN:1538-3598
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Arquitetura/história
Cidades/história
Saúde Pública/história
[Mh] Termos MeSH secundário: Movimentos do Ar
Poluentes Atmosféricos/história
Chicago
Materiais de Construção/história
História do Século XIX
Seres Humanos
Cidade de Nova Iorque
Aço/história
Luz Solar
Reforma Urbana/história
[Pt] Tipo de publicação:CLASSICAL ARTICLE; HISTORICAL ARTICLE; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 12597-69-2 (Steel)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:170208
[St] Status:MEDLINE
[do] DOI:10.1001/jama.2016.19841



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