Ni Fe
Mostrando 13-24 de 960 artigos, teses e dissertações.
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13. Concentração de metais em solo irrigado com diluições de água tratada produzida do petróleo
RESUMO Objetivou-se com este estudo avaliar a alteração nos teores de metais em um Ultisol, cultivado com palma forrageira (Nopalea cochenillifera) e irrigado com diluições de água produzida de petróleo tratada. O experimento foi montado no delineamento em blocos casualizados, com cinco tratamentos (T1 - 100% de água subterrânea; T2 - 75% de água su
Rev. bras. eng. agríc. ambient.. Publicado em: 2020-10
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14. Crystallographic Changes Accompanying the Verwey Transition in a Magnetite from Steatite
The crystallographic structural analysis of the magnetite of a steatite rock at 298 K, (saturation magnetization, σ = 95.0 J T-1 kg-1) showed two cubic networks and, below Verwey temperature (TV ca.120 K) a monoclinic structure, basing on their cell dimensions and different transitional behaviors when reducing the temperature. A monoclinic structure was ide
J. Braz. Chem. Soc.. Publicado em: 2020-09
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15. Phytochemical Analysis, Multi-Element Composition and Biological Activities of Extracts and Lupenone from Albizia inundata (Mart.) Barneby & J.W.Grimes
In this study, antimicrobial activity of extracts and lupenone from A. inundata (Fabaceae, Mimosoideae), were tested. In addition, the multi-element composition of the leaves, bark and stems (heartwood) of A. inundata was evaluated using inductively coupled plasma optical emission spectrometry (ICP OES). Lupenone was isolated in the petroleum ether extract o
J. Braz. Chem. Soc.. Publicado em: 2020-09
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16. Solos de minas de scheelita como fontes de contaminação por metais pesados
RESUMO O aporte de metais pesados é inerente à atividade de mineração, contudo a ausência de medidas de controle da poluição nas áreas mineradas concorre para a ampliação do potencial de contaminação do solo, da água e dos organismos. O objetivo deste trabalho foi avaliar o efeito do tempo de exposição de pilhas de estéril e rejeito que não
Eng. Sanit. Ambient.. Publicado em: 2020-08
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17. Concentration of Metals in Plant Litter Produced in Regions of Caatinga in Southwest Bahia, Brazil
Plant litter has several functions in a forest ecosystem. Studies about plant litter are of great importance to better understand and conserve ecological environments. The objective of this study was to investigate the concentration of metals (Fe, Co, Ca, Cu, Ni, Mg, Mn and Zn) in Caatinga plant litter in the southwest region of Bahia. Plant litter was colle
J. Braz. Chem. Soc.. Publicado em: 2020-07
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18. Avaliação da poluição atmosférica na área do distrito industrial de Maracanaú (CE), Brasil
RESUMO A intensificação das atividades industriais e o aumento das emissões veiculares têm contribuído significantemente para o aumento da poluição atmosférica nos centros urbanos. Neste trabalho, avaliou-se a qualidade do ar na área do distrito industrial de Maracanaú, no estado do Ceará, importante área industrial da Região Nordeste do Brasil.
Eng. Sanit. Ambient.. Publicado em: 2020-06
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19. VARIATIONS OF ELEMENT CONCENTRATIONS IN ROOTS OF DIFFERENT TREE SPECIES
ABSTRACT Element concentrations of roots play an important role for plant growth and below ground biochemical cycles in forest ecosystems. It can show a change among species. This research aimed to determine changes in the nutrient content for different root diameters of trees in the Belgrad forest. Natural species of Sessile oak (Quercus petraea L.), Scots
CERNE. Publicado em: 2020-03
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20. Characterization of the solid residue generated in the detoxification step of sugarcane bagasse hemicellulosic hydrolysate and behavior in agricultural soils
ABSTRACT Overliming is an effective way of neutralizing and reducing the toxicity of the hydrolysates generated from acidic pretreatment of lignocellulosic biomass for ethanol production and others biotechnological products. Overliming generates a solid residue whose inadequate disposal may represent an environmental problem. This work aimed at the chemical
Bragantia. Publicado em: 2020-03
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21. Microwave Assisted Ultra-Fast Method to Synthesize Carbonate-Phosphates, Na3MCO3PO4 (M = Mn, Fe, Co, Ni) - Relevant Materials Applied in Sodium-Ion Batteries
Although largely used in mobiles and electric vehicles applications, insertion batteries based on Li-ion technology are high-cost devices. These applications require high-performance energy storage systems with high-energy and high-power densities, which are better attained by Li-ion technology. However, stationary applications such as power plants and unint
J. Braz. Chem. Soc.. Publicado em: 2020-01
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22. Multi-Element Evaluation in Black Pepper (Piper nigrum L.) According to the Processing
Black pepper is one of the most consumed spices worldwide and the evaluation of trace elements content is essential to promote consumer safety. In this study, concentrations of the elements As, Cd, Co, Cu, Fe, Mn, Mo, Ni, Pb, Se, V and Zn was determined in samples of black peppercorn (n = 25) and ground black pepper (n = 25) to verify how processing affects
J. Braz. Chem. Soc.. Publicado em: 2020-01
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23. Cation Vacancies in NiFe2O4 During Heat Treatments at High Temperatures: Structural, Morphological and Magnetic Characterization
Nickel ferrite (NiFe2O4) was synthesized by mixing stoichiometric amounts of α-Fe2O3 and NiO using mechanical milling and heat treatments at high temperatures. The physical characterization of the samples was carried out using X-ray diffraction, infrared and Raman spectroscopies, Mössbauer spectrometry, magnetization measurements, scanning electron microsc
Mat. Res.. Publicado em: 20/12/2019
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24. Genome-Wide Assessment of Putative Superoxide Dismutases in Unicellular and Filamentous Cyanobacteria
Abstract Cyanobacteria are photoautotrophic prokaryotes capable to grow in diverse ecological habitats, originated 2.5-3.5 billion years ago and were first to produce oxygen. Since then superoxide dismutases (SOD) acquired great significance due to their ability to catalyze detoxification of byproducts of oxygenic photosynthesis i.e. superoxide radicals. In
Braz. arch. biol. technol.. Publicado em: 20/12/2019