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1.
Lumbaque Elisabeth Cuervo Schweigert Cálita Elis dos Santos Leonardo Oliveira Lavayen Vladimir dos Santos João Henrique Zimnoch Sirtori Carla 《Environmental science and pollution research international》2021,28(19):24124-24137
Environmental Science and Pollution Research - Pharmaceuticals, such as dipyrone (DIP), paracetamol (PCT), and propranolol (PPN), are widely used analgesics and beta-blockers with the greatest... 相似文献
2.
Elisângela Corradini Syed H. Imam José A. M. Agnelli Luiz H. C. Mattoso 《Journal of Polymers and the Environment》2009,17(1):1-9
Coconut, sisal and jute fibers were added as reinforcement materials in a biodegradable polymer matrix comprised of starch/gluten/glycerol.
The content of fibers used in the composites varied from 5% to 30% by weight of the total polymers (starch and gluten). Materials
were processed in a Haake torque rheometer (120 °C, 50 rpm) for 6 min. The mixtures obtained were molded by heat compression
and further characterized. Addition of lignocellulosic fibers in the matrix decreased the water absorption at equilibrium.
The diffusion coefficient decreased sharply around 5% fiber concentration, and further fiber additions caused only small variations.
The thermogravimetric (TG) analysis revealed improved thermal stability of matrix upon addition of fibers. The Young’s modulus
and ultimate tensile strength increased with fiber content in the matrix. The storage modulus increased with increasing fiber
content, whereas tanδ curves decreased, confirming the reinforcing effect of the fibers. Morphology of the composites analyzed
under the scanning electron microscope (SEM) exhibited good interfacial adhesion between the matrix and the added fibers.
Matrix degraded rapidly in compost, and addition of increased amounts of coconut fiber in the matrix caused a slowdown the
biodegradability of the matrix.
Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard
of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may be
suitable. 相似文献
3.
An international conference on polonium (Po) and radioactive isotopes was held in Seville Spain, 26-28 October 2009 at the Centro Nacional de Aceleradores. It was attended by 138 participants from 38 different countries. The sessions covered all aspects on Po and lead (Pb) such as radiochemistry, terrestrial and marine radioecology, kinetics, sedimentation rates, atmospheric tracers, NORM industries and dose assessment 相似文献
4.
Identification of various laccases induced by anthracene and contribution to its degradation in a Mediterranean coastal pine litter 总被引:1,自引:0,他引:1
Mediterranean coastal ecosystems are known to be highly subject to natural and anthropic environmental stress. In this study, we examine the effects of anthracene as a common pollutant on the total microbial communities from a Pinus halepensis litter of a typical Mediterranean coastal site (Les Calanques, Marseille). The main objective was to identify the microbial factors leading the resilience of this ecosystem. Two questions were addressed: (i) how lignin-degrading enzymes (Laccase, Lignin-peroxidase and Mn-peroxidase) are affected by the presence of this molecule, (ii) whether the indigenous consortia are involved in its degradation in mesocosms under favorable incubation conditions (25 °C, 60% WHC) and after different time intervals (1 and 3 month(s)). We found a strong increase in laccase production in the presence of anthracene after 3 months, together with anthracene degradation (28% ± 5). Moreover 9,10-anthraquinone is detected as the product of anthracene oxidation after 3 months. However neither lignin-peroxidase activity nor Mn-peroxidase activity is detected. Laccase proteins directly extracted from litter were sequenced via Nano-LC-MS/MS and reveal twelve different peptide sequences induced by the presence of anthracene in the mesocoms. Our study confirms the major detoxification role of this enzymatic system and highlights the high degradation potential of fungal species inhabiting P. halepensis litter, a factor in the resilience of Mediterranean ecosystems. 相似文献
5.
Studies of Np and Pu in the marine environment of Swedish-Danish waters and the North Atlantic Ocean
The long-lived anthropogenic radionuclides (237)Np, (239)Pu and (240)Pu were determined in marine environmental samples (seaweed and seawater) collected from Swedish-Danish waters and the North Atlantic Ocean at various locations on different occasions during the period 1991-2001. The measurements were performed with sector field Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and conventional alpha spectrometry. The (237)Np activity concentrations in Fucus vesiculosus and surface seawater from the Swedish west coast and Danish waters ranged from 0.16+/-0.02 to 1.02+/-0.09 mBq kg(-1) (dry weight) and 0.65+/-0.02 to 1.69+/-0.02 mBq m(-3), respectively, depending on the location and sampling year. Most of the (237)Np in these waters is believed to originate from the Sellafield nuclear reprocessing plant, with some contribution from global fallout. The (240)Pu/(239)Pu atomic ratios in F. vesiculosus samples are reported in this study with an overall average of 0.17+/-0.03. The (237)Np and (239)Pu activity concentrations observed in surface seawater collected in North Atlantic waters ranged from 0.16+/-0.01 to 0.62+/-0.08 mBq m(-3) and from 0.64+/-0.05 to 4.27+/-0.08 mBq m(-3), respectively, and the (237)Np/(239)Pu atomic ratios were a good indicator of conservative behaviour of Np in marine waters. 相似文献
6.
Arthur Marinho Cahino Elisângela Maria Rodrigues Rocha Iana Chaiene Araújo Vidal Samara Teixeira Pereira Amanda Gondim Cabral Quirino Raqueline Caldas do Nascimento 《环境质量管理》2023,32(3):57-68
The present study sought to objectively demonstrate how a researcher can, in a structured way, select relevant articles about alternative heterogeneous catalysts in photocatalytic processes. Therefore, the ProKnow-C (Knowledge Development Process – Constructivist) method was used to systematize the results found, with the application bibliometric and systematic analysis techniques for the evaluation of the results. The search string adopted as criteria was: solar photocatalysis AND heterogeneous catalysts OR alternative catalysts AND effluents. The databases were Web of Science, Science Direct and Scopus. The final bibliographic portfolio obtained for the research theme was made up of 19 articles. It was possible to verify advances in the number of publications on the theme over the evaluated period, with the Journal of Photochemistry and Photobiology A: Chemistry standing out in the final portfolio. Evaluating each article in the portfolio individually, it was possible to verify that most studies use combinations of catalysts already reported to create an alternative material to those already investigated in the literature. Those that use waste as catalysts chose to source this material from treatment plants and the steel industry. Around 58% of the papers used hydrogen peroxide in their processes, while 42% chose not to use it. Finally, approximately 63% of the papers in the portfolio used synthetic effluent in their processes, while the rest (37% of the research) chose to use real effluent. The results obtained in this research by applying the method can contribute to studies related to heterogeneous photocatalysis by alternative means over the years. 相似文献
7.
The radionuclides 210Po and 210Pb widely present in the terrestrial environment are the final long-lived radionuclides in the decay of 238U in the earth’s crust. Their presence in the atmosphere is due to the decay of 222Rn diffusing from the ground. The range of activity concentrations in ground level air for 210Po is 0.03-0.3 Bq m−3 and for 210Pb 0.2-1.5 Bq m−3.In drinking water from private wells the activity concentration of 210Po is in the order of 7-48 mBq l−1 and for 210Pb around 11-40 mBq l−1. From water works, however, the activity concentration for both 210Po and 210Pb is only in the order of 3 mBq l−1.Mosses, lichens and peat have a high efficiency in capturing 210Po and 210Pb from atmospheric fallout and exhibit an inventory of both 210Po and 210Pb in the order of 0.5-5 kBq m−2 in mosses and in lichens around 0.6 kBq m−2. The activity concentrations in lichens lies around 250 Bq kg−1, dry mass.Reindeer and caribou graze lichen which results in an activity concentration of 210Po and 210Pb of about 1-15 Bq kg−1 in meat from these animals. The food chain lichen-reindeer or caribou, and Man constitutes a unique model for studying the uptake and retention of 210Po and 210Pb in humans. The effective annual dose due to 210Po and 210Pb in people with high consumption of reindeer/caribou meat is estimated to be around 260 and 132 μSv a−1 respectively.In soils, 210Po is adsorbed to clay and organic colloids and the activity concentration varies with soil type and also correlates with the amount of atmospheric precipitation. The average activity concentration levels of 210Po in various soils are in the range of 20-240 Bq kg−1.Plants become contaminated with radioactive nuclides both by absorption from the soil (supported Po) and by deposition of radioactive fallout on the plants directly (unsupported Po). In fresh leafy plants the level of 210Po is particularly high as the result of the direct deposition of 222Rn daughters from atmospheric deposition. Tobacco is a terrestrial product with high activity concentrations of 210Po and 210Pb. The overall average activity concentration of 210Po is 13 ± 2 Bq kg−1. It is rather constant over time and by geographical origin.The average median daily dietary intakes of 210Po and 210Pb for the adult world population was estimated to 160 mBq day−1 and 110 mBq day−1, corresponding to annual effective doses of 70 μSv a−1 and 28 μSv a−1, respectively. The dietary intakes of 210Po and 210Pb from vegetarian food was estimated to only 70 mBq day−1 and 40 mBq day−1 corresponding to annual effective doses of 30.6 μSv a−1 and 10 μSv a−1, respectively. Since the activity concentration of 210Po and 210Pb in seafood is significantly higher than in vegetarian food the effective dose to populations consuming a lot of seafood might be 5-15 fold higher. 相似文献
8.
Lichens collected in the northern part of Sweden were analyzed over a 10-year period for chlorinated hydrocarbons. Results show a delay of 2–3 years between the production of PCBs and the deposition of these compounds in the lichen. They confirm the low solubility of PCBs in water and the predominance of atmospheric transport of these chlorinated compounds far away from industrialized areas. 相似文献
9.
Elisângela Düsman Michel Luzza Leoberto Savegnago Daiana Lauxen Veronica Elisa Pimenta Vicentini Ivane Benedetti Tonial Ticiane Pokrywiecki Sauer 《Environmental monitoring and assessment》2014,186(3):1793-1800
Due to an increase in water consumption in the industrial sector and within the Brazilian population, surface water that receives wastewater from industries, domestic sewage, agricultural industries, and sewage treatment stations can pollute water bodies when not properly treated. The water quality has been linked to catchment characteristics and intensity of agricultural activities. Thus, the aim of this study was to monitor the cytotoxic potential of the water of the Quatorze River, located in the town of Francisco Beltrão, Paraná, Brazil, along its route in the rural area, using the root meristematic cells of Allium cepa L. as a bioindicator. The results showed that the water at points 2, 3, and 4 were not cytotoxic because the rates of A. cepa cell division were unaltered. Point 1 had presented a mitotic index that was statistically larger than the negative control, indicating that this water contained substances with mitogenic capacity, as demonstrated by elevated values in chemical oxygen demand (COD) and biochemical oxygen demand (BOD). However, the mitotic index values decreased along the route of the river (point 1 to point 4), possibly indicating a mechanism of self-purification, despite having received other sources of pollution. Thus, the results of this study show that the water of the Quatorze River should undergo periodic environmental monitoring at different times of the year, including cytotoxicity analysis, to evaluate the principal sources of contamination to maintain the quality of the river water and, consequently, to maintain human health and equilibrium of the entire ecosystem. 相似文献
10.
Hugo D. Silva Ludimila A. C. Wosnjuk Sônia F. O. Santos Cesar A. S. T. Vilanova-Costa Flávia C. Pereira Elisângela P. Silveira-Lacerda Marco T. A. Garcíazapata Carlos E. Anunciação 《Food and environmental virology》2010,2(1):35-40
Adenoviruses are a highly important public health issue, since they are among the most persistent and ubiquitous viruses present
in water and associated with a variety of clinical manifestations. The aim of this study was to use molecular techniques for
the detection of adenovirus in public and recreational water supplies in Goiania, Brazil. From December 2007 to November 2008,
54 water samples were collected in 5 different sites in 2 lakes and 2 rivers of the city. The samples were filtered in a positively
charged nylon membrane, and the DNA was extracted using the phenol–chloroform–isoamyl alcohol method. Semi-nested PCR was
used to detect adenovirus DNA, and sequence analysis of the semi-nested PCR products was performed to identify the recovered
viruses. Adenovirus DNA was detected in 43% (24 of 54) of samples collected. Considering all examined sites, MP1 presented
the highest occurrence of adenovirus (6 positive from 10 collected samples), followed by MP2 (3 positive from 6 collected
samples), JL (10 positive from 21 collected samples), VB (3 positive from 9 collected samples), and BB (2 positive from 8
collected samples), respectively. The methodology employed proved to be feasible, fast, low-cost, and suitable to be used
as screening approach on adenovirus detection in water for public sanitation companies. 相似文献