Donnan
Mostrando 1-12 de 55 artigos, teses e dissertações.
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1. ESPECIAÇÃO TERMODINÂMICA DE METAIS TRAÇO COM SUBSTÂNCIAS HÚMICAS: O MODELO NICA-DONNAN
This work presents a critical overview of the NICA-Donnan model for trace metal thermodynamic speciation with humic substances obtained from natural organic matter in soils, natural waters and anthropogenic sources. A first part covers the theoretical aspects of the model, how to obtain good experimental data and perform the modelling. A second part deals wi
Quím. Nova. Publicado em: 2017-10
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2. Biaxial testing of canine annulus fibrosus tissue under changing salt concentrations
A mecânica in vivo do anel fibroso do disco intervertebral é baseada em carregamento biaxial ao invés de uniaxial. As propriedades materiais do anel estão intimamente ligadas à osmolaridade no tecido. O artigo apresenta experimentos de relaxação biaxiais do anel fibroso de um tecido canino sob mudanças abruptas na concentração externa de sal. A ass
Anais da Academia Brasileira de Ciências. Publicado em: 2010-03
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3. Distribuição e biodisponibilidade do níquel aplicado ao solo como NiCl2 e Biossólido. / Distribution and bioavailability of nickel applied to soil as nicl2 and biossólid.
The role of Nickel in soils under the application of biossolids is still not very well known. The objectives of this study were to investigate the influence of total Nickel and organic carbon content, and soil pH, in the Nickel distribution among soil fractions and the bioavailability of the metal to lettuce. Three incubation pot trials were carried out in g
Publicado em: 2003
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4. EXCHANGEABILITY AND FORMATION CONSTANTS OF COPPER, ZINC AND CADMIUM WITH HUMIC SUBSTANCES AT INDIGENOUS CONCENTRATIONS
A series of laboratory experiments and modeling investigations studied the exchangeability and the formation constants of trace metals with water-soluble humic substances at environmentally realistic concentrations. Copper (Cu2+), zinc (Zn2+), and cadmium (Cd2+) were the studied trace metals. These metals have different affinities for the binding sites of hu
Publicado em: 2001
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5. EFFECTS OF ROOT-DERIVED ORGANIC ACIDS ON METAL SPECIATION IN SOIL SOLUTION AND BIOAVAILABILITY
Several plant species can exude relative large amounts of low-molecular-weight organic acids (LMWOAs) into the hizosphere. Limited information is available about the effects of these compounds on the mobilization and bioavailability of trace metals for plants. The objective of this study was to measure the impact of in situ-produced and added LMWOAs on metal
Publicado em: 2000
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6. Analise cromatografica de acidos carboxilicos
Ion-exclusion partition chromatography is a technique used to separate weak acids, amino acids, sugar, alcohols and other substances on a cation-exchange column. Because of Donnan exclusion, ionic material is rejected by this exchange resin. However, non-ionic substances can undergo partítíon between the stationary phase and the mobile phase. Separations a
Publicado em: 1984
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7. Donnan potential of rabbit skeletal muscle myofibrils I: electrofluorochromometric detection of potential.
The fluorescence of the dye CC-6 [(3-hexyl-2-(3-hexyl-2-benzoxazolinylidene)-1-propenyl)-benzoxazolium iodide] has been shown to indicate Donnan potentials in rabbit skeletal muscle myofibrils. These results are in agreement with previously published work in which the potentials were measured with microelectrodes on glycerol-extraced muscle fibers. The magni
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8. In this number
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9. Key words and indices
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10. In this number: Cochrane and history
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11. In this number: Global theme issue—Ageing
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12. Diet, Life-Style and Mortality in China