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| Registros recuperados: 33 | |
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| Rashid, Gholami; Hekmat, Rabbani; Ali Nejat, Lorestani; Payam, Javadikia; Farzad, Jaliliantabar. |
| Agricultural machinery is an important source of emission of air pollutant in rural locations. This work deals with the effects of types of tractors and operation conditions on engine emission. The values of some exhaust gases (HC, CO, CO2, O2 and NO) from two common tractors (MF285 and U650) at three situations (use of ditcher, plowing and cultivator) were evaluated in the West of IRAN (Kermanshah). In addition, engine oil temperature at operation conditions was measured. Also results showed the values of exhaust HC and O2 of MF285 are lower than U650, while the other exhausts gases (CO, CO2, and NO) of MF285 are higher than U650. Value of NO emission increased as engine oil temperature increased. All of exhaust gases except CO have a significant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental pollution; Exhaust gases; Tractors. |
| Ano: 2013 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2363 |
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| Barriquelo,Marcilene Ferrari; Juliatti,Marinês Aparecida; Silva,Margarete Soares da; Lenzi,Ervim. |
| Lead (Pb) behavior was studied in soil treated twice with sewage sludge contaminated with lead at interval of 18 months. Soil samples received five different treatments: three with lead [0 (reference); 2,500; 5,000 mug g-1] and two with a mixture of lead and cadmium (interferer) (2,500 + 2,500 and 5,000 + 5,000 mug g-1, respectively). Vases containing treated soil were cultivated with maize in a greenhouse for 75 days. Pb was extracted using nitric perchloric digestion and analyzed by atomic absorption spectroscopy. The soil, containing sewage sludge contaminated by lead presented a higher concentration of Pb. The metal concentration remained constant in all treatments at 20-60 cm depth. No absorption of Pb by the plants was detected. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sewage sludge; Heavy metal; Lead; Environmental pollution. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400002 |
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| Paglia,Edmilson Cezar; Serrat,Beatriz Monte; Freire,Clarice Azevedo de Luna; Sirtoli,Ana Rosa dos Anjos; Veiga,Andrea Mayer. |
| The objective of this research was to evaluate the potassium interference, used as supplementary fertilization, in the ions leaching, in a soil that was treated with alkalinized sewage sludge and cultivated, with maize. The experimental set with sewage sludge results showed an increase of the potassium concentration and chloride concentration in the leached solution, as well as the reduction of the Al3+ concentration, as the doses of potassium fertilizer applied to the soil were increased, for the four leachings. The presence of sewage sludge treated with lime increased the concentration of NO3 -, Cl-, Ca2+, Mg2+ and Al3+ in the solutions in the majority of leachings. Values of Al3+ were higher than 0.1 mg L-1, than in all leachings when sewage sludge was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosoli; Ionic leaching; Water contamination; Environmental pollution. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000400004 |
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| Moreira,Ivan; Fraga,Alessandro Luis; Paiano,Diovani; Oliveira,Gisele Cristina de; Scapinello,Cláudio; Martins,Elias Nunes. |
| The effects of increasing lysine levels on nitrogen balance of pigs fed on low protein diets were evaluated. Four treatments (diets) containing lysine levels (0.8, 1.0 1.2 and 1.4%) were applied to 12 starting (20.0 ± 1.8 kg) barrow pigs. Methionine, threonine and tryptophan were kept constant to the lysine ratio in all diets. Feces and urine were collected during a 5-day period. Nitrogen output in urine (NOU), total nitrogen output (TNO), nitrogen retention (NR), net protein utilization (NPU), biological value or feed protein (BVFP), urine urea nitrogen (UUN), and plasma urea nitrogen (PUN) were determined. PUN showed high negative correlations with BVFP (-0.84), NPU (-0.76), and NR (-0.78) and a positive correlation (0.79) to NOU. Lowest nitrogen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental pollution; Crystalline amino acids; Protein metabolism; Slurry. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000100012 |
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| Vaz,Sérgio Renato; Lenzi,Ervim; Luchese,Eduardo Bernardi; Fávero,Luzia O. B.. |
| Este trabalho analisa a dinâmica do chumbo no lago do parque do Ingá, Maringá - PR. Mensalmente durante um ano foram coletadas amostras de água e sedimentos e o pH e temperatura medidos no ato da coleta. Nas amostras de água foi determinada a Demanda Química de Oxigênio (DQO) e a concentração total de Pb na água e sedimentos. A determinação da concentração Pb na água e sedimentos foi feita com a técnica da espectrometria da absorção atômica, modalidade chama. Os valores médios mensais encontrados, em intervalos e médias globais foram respectivamente: concentração de Pb na água, em ng.mL-1, não detectado (nd) - 55,56 e 19,23; Pb em sedimentos, em µg.g-1, 48,73 - 92,87 e 71,93; pH, 7,02 - 8,23 e 7,60; temperatura, em °C, 19,33 - 27,48 e 23,73; DQO, em... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lead; Lakes; Environmental pollution; Elements environmental dynamic; Environment. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000400010 |
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| Oliveira,Jeani Moreira de; Silva,Sérgio Henrique Godinho; Menezes,Michele Duarte de; Kämpf,Nestor; Curi,Nilton. |
| ABSTRACT Environmental pollution is a problem that has been noted due to changes in the environment, affecting natural resources. Regarding the soil, it may offer great potential for waste disposal. Thus, this study aims to propose criteria for evaluating local suitability for waste disposal, according to soil and terrain attributes for southern Minas Gerais State, and to apply those criteria to define the most appropriate locations for installation of septic systems in a pilot watershed. Literature and the authors' experience were used to propose the more important criteria regarding the suitability of sites for waste disposal. The set of attributes taken into account was grouped into four suitability classes: Adequate, Regular, Restricted and Inadequate.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental pollution; Watershed; Pedology.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000100037 |
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| López,Liliana; Santamaría,Johanna; Sánchez,Alexandra; Castro,Lida; Moreno,Jessica L. |
| This study assessed the presence of tetracycline-resistant bacteria in five different grassland-based production systems dedicated to raising dairy cattle located in the Colombian Andes. Animal (ruminal fluid and feces) and environmental (soil and water) samples were evaluated, and resistant heterotrophic bacteria were found in rumen fluid, feces, soil, and runoff water samples. The resistant bacteria were isolated and identified based on the 16S rDNA region. Subsequently, they were evaluated for the presence of tet genes, which encode ribosomal protection proteins and membrane efflux pumps. The most frequent phyla detected were Firmicutes and Proteobacteria. The most common resistance genes found were tet(W), tet(Q), and tet(M). The nucleotide sequences... |
| Tipo: Journal article |
Palavras-chave: Antimicrobial resistance; Cattle farms; Colombian Andes; Environmental pollution; Tetracycline. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300002 |
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| Puppo,Débora Del; Haese,Douglas; Gomes,Levy de Carvalho; Kill,João Luís; Brugnara,Enrique Coelho; Barcellos,Joyce; Haddade,Ismail Ramalho; Ton,Nielton Cezar. |
| ABSTRACT: Two experiments were conducted to evaluate the effects of reducing dietary crude protein (CP), based on the ideal protein concept for Nile tilapia reared in net pens. The experimental (isocaloric, isocalcium, and isophosphoric) diets were formulated to contain 270, 300, 330, and 360g kg-1 CP. In experiment 1, 4320 Nile tilapia (13.5±0.82g) were used to evaluate the performance and hematological parameters. The experimental design was completely randomized and the fish were distributed in 24 net pens (1.0m3), with four diets, six replicates, and 180 fishes per experimental unit. In experiment 2, 40 Nile tilapia (22.5±0.56g) were used to evaluate the ammonia excretion. Fish were distributed in 40 aquaria (3.0L), with one fish per aquarium (n=10).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amino acids; Performance; Statistic models; Oreochromis niloticus; Environmental pollution. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300651 |
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| Vázquez Luna, Dinora. |
| En México, el desarrollo basado en la industria petrolera ha afectado los suelos y recursos naturales del sureste del país; sin embargo, no hay estudios que vinculen sus efectos sobre el desarrollo equitativo de los habitantes en zonas contaminadas. Por ello, el objetivo del trabajo fue analizar desde la perspectiva de género, los efectos sociales sobre el desarrollo equitativo de las familias, en cuatro zonas de los ejidos de Humanguillo, Tabasco (Rovirosa, El Paraíso, La Ceiba y Gurría), que se ubican a una distancia de 0.5, 2.5, 7 y 12 kilómetros al sur la petroquímica La Venta. Se realizaron encuestas con enfoque de género y de salud, donde las unidades de análisis fueron las familias. Se realizaron análisis de suelos para determinar los efectos de la... |
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Palavras-chave: Género; Asma; Contaminación ambiental; Hidrocarburos; Alergias; Gender; Asthma; Environmental pollution; Hydrocarbons; Allergies; Doctorado; Desarrollo Rural. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/422 |
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| Vázquez Luna, Dinora. |
| En México, el desarrollo basado en la industria petrolera ha afectado los suelos y recursos naturales del sureste del país; sin embargo, no hay estudios que vinculen sus efectos sobre el desarrollo equitativo de los habitantes en zonas contaminadas. Por ello, el objetivo del trabajo fue analizar desde la perspectiva de género, los efectos sociales sobre el desarrollo equitativo de las familias, en cuatro zonas de los ejidos de Humanguillo, Tabasco (Rovirosa, El Paraíso, La Ceiba y Gurría), que se ubican a una distancia de 0.5, 2.5, 7 y 12 kilómetros al sur la petroquímica La Venta. Se realizaron encuestas con enfoque de género y de salud, donde las unidades de análisis fueron las familias. Se realizaron análisis de suelos para determinar los efectos de la... |
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Palavras-chave: Género; Asma; Contaminación ambiental; Hidrocarburos; Alergias; Gender; Asthma; Environmental pollution; Hydrocarbons; Allergies; Doctorado; Desarrollo Rural. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/422 |
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| Ferreira Araujo, Daniel; Ponzevera, Emmanuel; Briant, Nicolas; Knoery, Joel; Bruzac, Sandrine; Sireau, Teddy; Brach-papa, Christophe. |
| Toulon bay is severely impacted by metal contamination induced by past and recent naval activities. In this work, Cu, Zn and Pb isotope compositions and elemental concentrations of fifty-five surface sediments were determined in order to map the spatial distribution of anthropogenic and natural sources along this land-sea continuum. Two sub-systems of Toulon Bay, the Small and Large bays, showed well-marked patterns on metal contamination levels and isotope signatures for Cu and Pb. The Small bay had the highest metal concentrations, and displayed average Pb and Cu isotope compositions of 1.1664 ± 0.0043 (1s, expressed as 206Pb/207Pb ratios) and −0.17 ± 0.19‰ (1s, expressed as δ65CuNIST values), respectively. It contrasted with the Large bay, with moderate... |
| Tipo: Text |
Palavras-chave: Metal isotopes; Isotope tracers; Geochemical isotopes; Environmental pollution; Coastal pollution; Toulon bay. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00566/67784/67226.pdf |
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| Rao,M.A; Scelza,R; Scotti,R; Gianfreda,L. |
| Environmental pollution is growing more and more due to the indiscriminate and frequently deliberate release of hazardous, harmful substances. Research efforts have been devoted to develop new, low-cost, low-technology, eco-friendly treatments capable of reducing and even eliminating pollution in the atmosphere, the hydrosphere and soil environments. Among biological agents, enzymes have a great potentiality to effectively transform and detoxify polluting substances because they have been recognized to be able to transform pollutants at a detectable rate and are potentially suitable to restore polluted environments. This brief review will examine some classes of pollutants and enzymes capable of transforming them effectively into innocuous products.... |
| Tipo: Journal article |
Palavras-chave: Pollutants; Enzymes; Environmental pollution; Bioremediation. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100008 |
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| Car, J.; Dizdarevic, T.. |
| The environmental conditions in the Idrija Mercury Mine and its broader surroundings were strongly affected in the first half of the 19th century by two disastrous pit fires. The fire could only be extinguished by flooding of the pit. The consequences of such flooding was extensive poisoning with mercury vapours, not only among those miners who participated in the fire extinguishing effort and later in the rehabilitation of the pit, but also among the inhabitants of Idrija. During rehabilitation works, the highly polluted water was discharged directly into the Idrijca River, killing all the fish species thriving there. After 1835 the Mine gradually intensified its production. The dumping of increasingly larger quantities of smelting wastes directly into... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Mercury mine; Environmental pollution; Indemnity; 43.56. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/215392 |
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| 坂本, 直久; 谷, 昌幸; 小池, 正徳; 倉持, 勝久; 岸本, 正; 梅津, 一孝; Sakamoto, Naohisa; Tani, Masayuki; Koike, Masanori; Kishimoto, Tadashi; Umetsu, Kazutaka; Kuramochi, Katsuhisa. |
| 本研究では，貯留中の乳牛ふん尿スラリーから発生する環境負荷ガスを低減するため，化学肥料を撥水加工した革新的なカバー資材を開発し，その抑制効果の評価とメカニズムについて検証した。スラリーは，メタン発酵前と発酵後の2種類を用いた。資材は，スラリー上に浮かべることを可能とし，また農地還元する上で不足する植物養分を補給するために，微粉砕した化学肥料に疎水性シリカを混合することにより調製した。実験室規模で13日間のガス発生量を測定した。アンモニアやメタンの積算発生量はメタン発酵後のスラリーの方が発酵前のそれよりも高かった。本資材を供試することにより，スラリーから発生するガスの吸着またはスラリーの発酵挙動が変化し，アンモニアやメタンの発生量が著しく減少した。さらに，資材の一部が溶解してスラリーの養分量が増加するので，本技術は農作業の効率化が図られるとともに，畜産廃棄物の有効利用に役立つと考えられる。 The objectives of this study were to verify the effectiveness in reducing polluting gas emissions of novel methods for covering dairy slurry by using various types of hydrophobic fertilizers and to evaluate the mechanisms for reducing gas emissions from this slurry before and after methane fermentation. The hydrophobic fertilizers were prepared by mixing... |
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Palavras-chave: 畜産廃棄物; スラリー貯留槽; アンモニア; 温室効果ガス; 環境汚染; Animal waste; Slurry store; Ammonia; Greenhouse gas; Environmental pollution. |
| Ano: 2008 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2832 |
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| Rey-Villiers, N.; Alcolado, P. M.. |
| Se determinó la variación de la talla de los octocorales Eunicea flexuosa y Plexaura kuekenthali en arrecifes coralinos con diferente grado de contaminación urbana en la ciudad de La Habana, Cuba. Se midió la altura de las colonias encontradas a lo largo de un transepto de banda (100 x 1 m). La distribución por tallas de ambas especies mostró una tendencia a que las colonias alcancen una mayor frecuencia relativa en los menores intervalos de tallas en los sitios cercanos a las cuencas fluviales con mayor carga contaminante (medido por el número de fuentes contaminantes y carga dispuesta, DBO). La talla media de E. flexuosa fue significativamente menor en los dos sitios cercanos a las cuencas con mayor carga contaminante. Sus mayores tamaños de efecto... |
| Tipo: Journal Contribution |
Palavras-chave: Environmental pollution; Size distribution; Coral; Gorgoniidae; Environmental pollution; Size. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4590 |
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| Registros recuperados: 33 | |
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