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201.
Victor Navarro da Silva Caroline de Lima Frachia Isis Caroline Ferreira Barbosa Mariana Bocchi da Silva Wesller da Silva de Paiva Lucas Anjos Souza Gilberto Costa Justino Liliane Santos de Camargos 《环境质量管理》2021,30(3):27-36
Soil contamination by trace elements (TEs) is a problem of great concern since the industrial revolution. However, not all TEs are essentially toxic, and several micronutrients such as boron (B) play essential roles during plant development and, in this case, B acts in plants as a structural element. Soil B levels above 3.0 mg dm–3 may be toxic to many plants and the greatest input of B to the environment occurs through the anthropic way. An environmentally promising alternative is phytoremediation, in which contaminant‐tolerant plants are used to remove or stabilize TEs in soils. Therefore, this work has been carried out to aim C. mucunoides’ tolerance to increasing B concentrations and its potential as a phytoremediator. We found out that C. mucunoides tolerates B doses up to 480 mg dm?3, the B uptaken is transported at a 1:1 ratio between root and shoot, suggesting that C. mucunoides can be used as a phytostabilizer and phytoextractor due to its potential to be used in phytoremediation techniques because it can tolerate toxic concentrations of B. 相似文献
202.
Carlos Garcia Teresa Hernandez Ascension Barahona Francisco Costa 《Environmental management》1996,20(1):133-141
Twenty-one severely eroded soils of SE Spain (Torriorthent xeric soils) were studied. These soils form a fragile system characterized
by soils with a low density of plant cover (<5%), are loamy and occur in a semiarid climate. The soils formerly were used
for agricultural purposes but were abandoned at least 15 years ago. These eroded soils had a low total organic carbon content,
and their humic substances, humic acid carbon, and carbohydrates were lower compared with soils that had never been cultivated
(natural soils). The variables in which the effects of erosion were particularly noted were those related with the active
organic matter (respiration and water-soluble organic matter). Those eroded soils with higher salt content showed lower organic
matter and carbohydrate contents. Only total nitrogen was correlated with the carbon fractions in the eroded soils. 相似文献
203.
Seven mixtures from four organic residues—an aerobic sewage sludge, a city refuse, a peat residue, and a grape debris—were
composted, and the changes undergone by their different carbon fractions during their composting and maturation were studied.
In most cases a decrease in carbon fractions during the composting and maturation processes was observed. The extractable
carbon, however, increased during maturation. Organic matter mineralization was greater in the composts with city refuse than
in those with sewage sludge. The samples with peat residue showed the lowest decreases in carbon fractions. During maturation,
an increase of humiclike fraction was observed, which was reflected by a decrease in the soluble carbon-precipitated carbon
ratio at pH 2. Water-soluble carbon was the carbon fraction most easily degradable by microorganisms, and its amount correlated
significantly with composting time in all the samples. 相似文献
204.
205.
This paper focuses on the social features of ene rgy production and use in Brazil and discusses the role of the energy policy goals of accessibility, affordability and acceptability in defining a sustainable energy future for the country. The major findings are that social inequalities in Brazil regarding energy use continue to be substantial and important. This can be explained by the fact that, although recent decades have seen significant improvements in energy accessibility all over the country, much more needs to be done to provide affordable, and socially acceptable modern energy carriers to all socio‐economic groups in all regions. 相似文献
206.
In the real option pricing model of valuation and decision making, the estimation of future volatility is a key input parameter. For traded commodities or financial assets, past volatility is used as a proxy for predictions. But, for projects, this approach is not feasible because, in most cases, historical data of traded projects are not available. As an alternate solution, it is usually assumed that project volatility is equal to that of commodity price. In order to investigate this assumption, we estimate the project volatility considering that both commodity price and operating cost evolve as a geometric Brownian motion (GBM). Results of a hypothetical gold mining project indicate that project volatility is higher than that of commodity price and it only drops to price volatility under very unrealistic industry conditions, such as very high prices or very low production costs. In addition, we find that project volatility is independent of production capacity and taxation, but depends on increments in price and cost, as well as strongly on their degree of correlation. 相似文献
207.
Many marine organisms are fixed or highly sedentary as adults but the adult population may be strongly dependent on the oceanic transport of planktonic larvae. In order to assess interactions between oceanographic and biological processes that determine the population dynamics of marine organisms with a sessile adult phase restricted to the coastline and a planktonic larval phase, we present a stage-structured finite element model for the barnacle Balanus glandula that inhabits the rocky intertidal zone of central California, USA. 相似文献
208.
Verona Borges Ferreira Leonardo Fontes Estrella Marcelo Guzzon Rodrigues Alves Christoph Gallistl Walter Vetter Thadia Turon Costa Silva 《Journal of environmental science and health. Part. B》2020,55(1):30-41
AbstractOrganochlorine (OCP) pesticides were determined in samples of sardine (Sardinella brasiliensis), whitemouth croaker (Micropogonias furnieri), and mullet (Mugil liza) from Guanabara Bay (state of Rio de Janeiro, Brazil). OCP concentrations and fish consumption were linked with acceptable daily intake values in order to assess the human health risk for the Brazilian population. The total concentrations of OCPs (Σ OCP) was 6.6?ng/g f.w., 7.5?ng/g f.w., and 2.8?ng/g f.w. for sardines, corvina, and mullet, respectively. There was a significant difference (P?<?0.05) among the species related to o,p’-DDD and o,p’-DDT concentrations. Both DDT-related compounds were 5 and 76 times more abundant in sardines than in whitemouth croaker and mullet. Newly discovered DDT metabolite, o-Cl-DDMU, was frequently detected in the fish. None of the samples exceeded the maximum limits for acceptable levels of OCP residues. According to the data of average intake of Brazilian population, none of three species exceeded toxicological parameter. The investigated fishes are considered as safe for human consumption in regard to exposure of the studied OCPs. However, fish may be a intake source of OCP metabolites such as o-Cl-DDMU whose toxicity is still unknown. 相似文献
209.
Renata Cristina Ferreira Bonomo Taline Amorim Santos Leandro Soares Santos Rafael da Costa Ilhéu Fontan Luciano Brito Rodrigues Ana Clarissa dos Santos Pires Cristiane Martins Veloso Olga Reinert Ramos Gandolfi Paulo Bonomo 《Journal of Polymers and the Environment》2018,26(2):508-517
Jackfruit starch based biodegradable films containing lysozyme were characterized for their antimicrobial activity, thickness, solubility, water vapor permeability and mechanical properties. The biodegradable films had good appearance and antimicrobial activity against Micrococcus lysodeikticus. The thickness of the biodegradable films were not affected by the variation in pH, but the addition of lysozyme increased the thickness, the thickest films being those with the highest lysozyme concentrations. The variation in pH of the filmogenic solutions affected the solubility of the biodegradable films, water solubility being greatest at pH 7.0 and with the highest lysozyme concentration. The permeability of the biodegradable films was increased by incorporating lysozyme. The lysozyme concentration and pH variation caused changes in the mechanical properties. The addition of 8% lysozyme increased the tensile strength and Young’s modulus for all the pH values studied. With respect to the release of antimicrobial activity, the diffusion of lysozyme was shown to follow Fickian transport mechanism. 相似文献
210.
Mendes Bruna de Oliveira Rabelo Letícia Martins e Silva Bianca Costa de Souza Joyce Moreira da Silva Castro André Luis da Silva Anderson Rodrigo de Lima Rodrigues Aline Sueli Malafaia Guilherme 《Environmental science and pollution research international》2017,24(23):19234-19248
Environmental Science and Pollution Research - The current study has assessed whether the oral and/or dermal exposure of C57Bl/6 J mice to tannery effluent (a complex pollutant consisting of... 相似文献