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661.
Pinheiro MC Crespo-López ME Vieira JL Oikawa T Guimarães GA Araújo CC Amoras WW Ribeiro DR Herculano AM do Nascimento JL Silveira LC 《Environment international》2007,33(1):56-61
Mercury is a hazardous metal responsible for environmental contamination and human intoxication. Methylmercury, a very toxic organic compound, bio-accumulates through food chain, and is responsible for chronic mercury exposure of riverside Amazonian communities with a diet rich in fish. Uncertainties about the reference exposure dose that could have damaging consequences for nervous system development makes necessary the biomonitoring of these Amazonian populations, especially children. In this work, a comparative study was performed in exposed and non-exposed children living in the Amazon. A total of 168 children were analyzed to find possible correlations between gender, age, location, and hair mercury content. For each location, no statistically significant differences (P<0.05) were detected for gender and age versus mercury content. However, mean mercury levels in hair samples may indicate a tendency of boys to average higher hair concentrations. Also, in the community with highest levels of mercury, the limit of 10 micro g/g of mercury was surpassed by 65% of 2-6 years and 50% of 7-12 years children but only by 27% of 0-1 year babies, pointing to a lower bioaccumulation and/or the existence of a protection mechanism in babies. Log normal distributions of mercury concentrations for each location showed that children from populations under influence of gold mining activity contain the highest mercury levels in hair samples, though this intoxication may have decreased when compared to previous studies. Knowledge originated by this monitoring will better assist in the development of prevention strategies and government actions targeting the mercury contamination of Amazonian environment. 相似文献
662.
Vanesa L. Negrin Carla V. Spetter Ra′ul O. Asteasuain Gerardo M. E. Perillo Jorge E. Marcovecchio 《环境科学学报(英文版)》2011,23(2):212-221
Four sites were selected in a salt marsh in the Bah′?a Blanca Estuary (Argentina): (1) low marsh (flooded by the tide twice daily)
vegetated by S. alterniflora; (2) non-vegetated low marsh; (3) high marsh (flooded only in spring tides) vegetated by S. alterniflora;
(4) non-vegetated high marsh. The pH and Eh were measured in sediments, while dissolved nutrients (ammonium, nitrate, nitrite and
phosphate) and particulate organic matter (POM) were determined in pore water. pH (6.2–8.7) was only a ected by vegetation in low
areas. Eh (from –300 to 250 mV) was lower at low sites than at high ones; in the latter, the values were higher in the non-vegetated
sediments. The POM concentration was greater in the high marsh than in the low marsh, with no e ect of vegetation. Ammonium
was the most abundant nitrogen nutrient species in pore water, except in the non-vegetated high marsh where nitrate concentration
was higher. All nitrogen nutrients were a ected by both flooding and vegetation. Phosphate was always present in pore water at all
sites throughout the year and its concentration varied within narrow limits, with no e ect of flooding and greater values always at
non-vegetated sites. Our results showed that the variability of the pore water composition within the marsh is greater than the temporal
variation, meaning that both tidal flooding and vegetation are important in the dynamics of nutrients and organic matter in the sediment
pore water. 相似文献
663.
Cabreira SF Schultz CL Bittencourt JS Soares MB Fortier DC Silva LR Langer MC 《Die Naturwissenschaften》2011,98(12):1035-1040
Post-Triassic theropod, sauropodomorph, and ornithischian dinosaurs are readily recognized based on the set of traits that
typically characterize each of these groups. On the contrary, most of the early members of those lineages lack such specializations,
but share a range of generalized traits also seen in more basal dinosauromorphs. Here, we report on a new Late Triassic dinosaur
from the Santa Maria Formation of Rio Grande do Sul, southern Brazil. The specimen comprises the disarticulated partial skeleton
of a single individual, including most of the skull bones. Based on four phylogenetic analyses, the new dinosaur fits consistently
on the sauropodomorph stem, but lacks several typical features of sauropodomorphs, showing dinosaur plesiomorphies together
with some neotheropod traits. This is not an exception among basal dinosaurs, the early radiation of which is characterized
by a mosaic pattern of character acquisition, resulting in the uncertain phylogenetic placement of various early members of
the group. 相似文献
664.
665.
666.
Branß Till Núñez-González Francisco Aberle Jochen 《Environmental Fluid Mechanics》2022,22(2-3):559-585
Environmental Fluid Mechanics - Natural levees are wedge-shaped morphological features developing along the boundaries of mass flows. When they form in fluvial landscapes, they can have multiple... 相似文献
667.
Tavella Ronan Adler Fernandes Caroline Lopes Feijo Schimith Lucia Emanueli Volcão Lisiane Martins dos Santos Marina da Silva Júnior Flavio Manoel Rodrigues 《Environmental science and pollution research international》2022,29(49):74335-74345
Environmental Science and Pollution Research - Socioeconomic and demographic factors, lifestyle and cultural characteristics may play an important role in the development of genetic damage. This... 相似文献
668.
Pedroso Thays Millena Alves Benvindo-Souza Marcelino de Araújo Nascimento Felipe Woch Júlia dos Reis Fabiana Gonçalves de Melo e Silva Daniela 《Environmental science and pollution research international》2022,29(12):17464-17475
Environmental Science and Pollution Research - Occupational exposure to pesticides has been identified as a major trigger of the development of cancer. Pesticides can cause intoxication in the... 相似文献
669.
Solier Yamil Nahún Schnell Carla Natalí Galván María Verónica Mocchiutti Paulina Zanuttini Miguel Ángel Inalbon María Cristina 《Journal of Polymers and the Environment》2022,30(1):114-124
Journal of Polymers and the Environment - Novel hemicellulose-based films from polyelectrolyte complexes (PECs) of chitosan and xylan from sugar cane bagasse were prepared and characterized. PEC... 相似文献
670.
Compositional analysis of topsoil metals and its associations with cancer mortality using spatial misaligned data 总被引:1,自引:0,他引:1
Gonzalo López-Abente Juan Locutura-Rupérez Pablo Fernández-Navarro Iván Martín-Méndez Alejandro Bel-Lan Olivier Núñez 《Environmental geochemistry and health》2018,40(1):283-294
The presence of toxic metals in soil per se, and in soil impacted by mining, industry, agriculture and urbanisation in particular, is a major concern for both human health and ecotoxicology. The dual aim of this study was: to ascertain whether topsoil composition could influence the spatial distribution of mortality due to different types of cancer and to identify possible errors committed by epidemiological studies which analyse soil composition data as a closed number system. We conducted an ecological cancer mortality study, covering 861,440 cancer deaths (27 cancer sites) in 7917 Spanish mainland towns, from 1999 to 2008. Topsoil levels of Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn were determined by ICP-MS at 13,317 sampling points. We transformed the topsoil data in two ways, i.e. log transformation and centred logratio transformation. Principal factor analysis was performed to obtain independent latent factors for the transformed variables. To estimate the effect on mortality of topsoil factor loadings, we fitted Besag, York and Mollié models embedded in geostatistical-spatial models. This model included soil sample locations and town centroids (non-aligned data), fitted using the integrated nested Laplace approximation (INLA) as a tool for Bayesian inference and stochastic partial differential equations (SPDE). All results were adjusted for socio-demographic variables. The results indicated that soil composition could have an influence on the spatial distribution and mortality patterns of cancer. The analysis adjusted for socio-demographic variables showed excess male mortality due to digestive system tumours in areas with soils containing higher Cd, Pb, Zn, Mn and Cu concentrations, bladder cancer in areas with soils containing higher Cd concentrations, and brain cancer in areas with soils containing As. In both sexes, cancer of oesophagus was associated with soils containing a higher lead content, while lung cancer was associated with soils containing a higher copper content. Stress should be laid on the importance of taking into account the compositional nature of the data in this type of analysis. 相似文献