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排序方式: 共有154条查询结果,搜索用时 15 毫秒
111.
Tanandra Bernieri Melina Floriano Moraes Patrícia Grolli Ardenghi 《Journal of environmental science and health. Part. B》2020,55(4):355-360
AbstractThe aim of this study was to evaluate the DNA damage in soybean growers during two agricultural periods of a crop season (high and low exposure) and a control group, as well as butyrylcholinesterase (BChE) activity during these exposure periods in order to estimate the degree of BChE inhibition for the exposed group. DNA damage in peripheral whole blood was evaluated by the comet assay and plasma BChE activity was accessed as a measure of exposure to cholinesterase inhibitors. None of the soybean growers reported using full Personal Protective Equipment (PPE). BChE was lower in high exposure period than in low exposure period and DNA damage index was significantly increased in the high exposure period than in the low exposure period. In addition, DNA damage in both exposure periods was higher than control group. No correlation was found between exposure time and DNA damage and BChE activity. However, negative correlation was observed between DNA damage in high and low exposure periods. The results indicate that soybean growers are exposed to cholinesterase inhibitors and to pesticides mixtures with genotoxic potential. 相似文献
112.
Tiziano Tirabassi Alessandro Tiesi Daniela Buske Marco T. Vilhena Davidson M. Moreira 《Atmospheric environment (Oxford, England : 1994)》2009,43(13):2221-2227
The moments of the concentration distribution obtained using a recent analytical solution of the steady-state two-dimensional advection–diffusion equation are presented. The solving methodology is the Generalized Integral Laplace Transform Technique, which allows obtaining a reliable solution of the advection–diffusion equation without any restrictive assumption about the eddy diffusivity coefficients and wind speed profiles. The first four moments and value and position of maximum ground level concentration are calculated. The concentration standard deviation is compared against the semi-empirical ones used in operative Gaussian models. 相似文献
113.
Lena Wartosch Karen Schindler Melina Schuh Jennifer R. Gruhn Eva R. Hoffmann Rajiv C. McCoy Jinchuan Xing 《黑龙江环境通报》2021,41(5):620-630
The gain or loss of a chromosome—or aneuploidy—acts as one of the major triggers for infertility and pregnancy loss in humans. These chromosomal abnormalities affect more than 40% of eggs in women at both ends of the age spectrum, that is, young girls as well as women of advancing maternal age. Recent studies in human oocytes and embryos using genomics, cytogenetics, and in silico modeling all provide new insight into the rates and potential genetic and cellular factors associated with aneuploidy at varying stages of development. Here, we review recent studies that are shedding light on potential molecular mechanisms of chromosome missegregation in oocytes and embryos across the entire female reproductive life span. 相似文献
114.
D.M. Moreira T. Tirabassi M.T. Vilhena A.G. Goulart 《Atmospheric environment (Oxford, England : 1994)》2010,44(15):1859-1865
This paper presents a semi-analytical solution for the steady advection–diffusion equation that allows simulating the vertical turbulent dispersion of air pollution with deposition to the ground. The performances of the solution, with a proper parameterization of the vertical profiles of wind and eddy diffusivity, were evaluated against Hanford diffusion experiment dataset using two tracers (Doran and Horst, 1985): a non-depositing gas (SF6) and depositing particles (ZnS). Results show that the dispersion model with the K-parameterization included produces a good fitting of the measured ground-level concentration data and there are no big differences between the parameterizations taken from literature. A comparison with other models was shown and discussed. 相似文献
115.
Nitrous oxide nitrification and denitrification 15N enrichment factors from Amazon forest soils. 总被引:1,自引:0,他引:1
Tibisay Pérez Diana Garcia-Montiel Susan Trumbore Stanley Tyler Plínio de Camargo Marcelo Moreira Marisa Piccolo Carlos Cerri 《Ecological applications》2006,16(6):2153-2167
The isotopic signatures of 15N and 18O in N2O emitted from tropical soils vary both spatially and temporally, leading to large uncertainty in the overall tropical source signature and thereby limiting the utility of isotopes in constraining the global N2O budget. Determining the reasons for spatial and temporal variations in isotope signatures requires that we know the isotope enrichment factors for nitrification and denitrification, the two processes that produce N2O in soils. We have devised a method for measuring these enrichment factors using soil incubation experiments and report results from this method for three rain forest soils collected in the Brazilian Amazon: soil with differing sand and clay content from the Tapajos National Forest (TNF) near Santarém, Pará, and Nova Vida Farm, Rond?nia. The 15N enrichment factors for nitrification and denitrification differ with soil texture and site: -111 per thousand +/- 12 per thousand and -31 per thousand +/- 11 per thousand for a clay-rich Oxisol (TNF), -102 per thousand +/- 5 per thousand and -45 per thousand +/- 5 per thousand for a sandier Ultisol (TNF), and -10.4 per thousand +/- 3.5 per thousand (enrichment factor for denitrification) for another Ultisol (Nova Vida) soil, respectively. We also show that the isotopomer site preference (delta15Nalpha - delta15Nbeta, where alpha indicates the central nitrogen atom and beta the terminal nitrogen atom in N2O) may allow differentiation between processes of production and consumption of N2O and can potentially be used to determine the contributions of nitrification and denitrification. The site preferences for nitrification and denitrification from the TNF-Ultisol incubated soils are: 4.2 per thousand +/- 8.4 per thousand and 31.6 per thousand +/- 8.1 per thousand, respectively. Thus, nitrifying and denitrifying bacteria populations under the conditions of our study exhibit significantly different 15N site preference fingerprints. Our data set strongly suggests that N2O isotopomers can be used in concert with traditional N2O stable isotope measurements as constraints to differentiate microbial N2O processes in soil and will contribute to interpretations of the isotopic site preference N2O values found in the free troposphere. 相似文献
116.
Conti ME Finoia MG Bocca B Mele G Alimonti A Pino A 《Environmental monitoring and assessment》2012,184(1):527-538
Lichen, Usnea barbata, transplants taken from Tierra del Fuego (south Patagonia, Argentina) were tested as potential biomonitors of atmospheric
airborne deposition in an apparently pristine environment. In 2005, lichens were sampled in a reference site (n = 31) and transplanted in the northern Region of Tierra del Fuego. After, respectively, 1 month and 1 year of exposure, we
collected them. The aim of the study was to determine the bioaccumulation of 26 elements in order to evaluate the background
levels in the selected area. Samples were analyzed by the sector field inductively coupled plasma mass spectrometry. Discriminant
analysis on principal component analysis factors was applied in order to explore the relationship among the different elements
as far as time and spatial variation in transplants regards. The analysis was tested by Monte Carlo test based on 999 replicates.
The most important contamination source resulted to be the atmospheric soil particle deposition. Furthermore, the results
were compared with those obtained from the lichens collected in central and southern Tierra del Fuego. This study confirms
the ability of U. barbata to reflect the background levels of the 26 elements in that environment. Compared with other background sites in the world,
we did confirm that Tierra del Fuego lichens have a low content of the studied elements. Tierra del Fuego turned out not to
be a pristine environment as supposed, but it can be considered as a reference basal ecosystem for useful comparisons among
different geographical areas. These findings can be very relevant and useful for environmental conservation programs. 相似文献
117.
Rada Elena Cristina Ionescu Gabriela Ferronato Navarro Ragazzi Marco Raspanti Mario Conti Fabio Torretta Vincenzo 《Environmental science and pollution research international》2021,28(42):59076-59082
Environmental Science and Pollution Research - In the present paper, different types of pure and commercial plastic waste from different EU countries (UK, France, Italy, and Romania) were... 相似文献
118.
A study was conducted to determine the potential of a two-phase partitioning bioreactor (TPPB) for the treatment of a poorly soluble compound, anthracene, by the enzyme manganese peroxidase (MnP) from the fungus Bjerkandera sp. BOS55. Silicone oil was used as the immiscible solvent, which contained anthracene at high concentrations. The optimization of the oxidation process was conducted taking into account the factors which may directly affect the MnP catalytic cycle (the concentration of H(2)O(2) and malonic acid) and those that affect the mass transfer of anthracene between the organic and the aqueous phase (solvent and agitation speed). The main objective was carried out in terms of improved efficiency, i.e., maximizing the anthracene oxidized per unit of enzyme used. The TPPB reached nearly complete oxidation of anthracene at a conversion rate of 1.8mgl(-1)h(-1) in 56h, which suggests the application of enzymatic TPPBs for the removal of poorly soluble compounds. 相似文献
119.
Lanzarini Natália Maria Marinho Mata Rafaela Mendes Saggioro Enrico Costa Moreira Josino Ferreira Mannarino Camille Pereira Miagostovich Marize 《Food and environmental virology》2020,12(3):209-217
Food and Environmental Virology - Leachate from solid waste landfill is a dark liquid of variable composition and possible source of contamination of groundwater and surface waters. This study aims... 相似文献
120.
Conti Marcelo Enrique Astolfi Maria Luisa Finoia Maria Grazia Massimi Lorenzo Canepari Silvia 《Environmental science and pollution research international》2022,29(24):36057-36074
Environmental Science and Pollution Research - In this study, we determined the levels of elements (i.e. As, Be, Cd, Cr, Hg, Ni, Pb, U, and Zn) in bees and edible beehive products (honey, wax,... 相似文献