Ion Exchanger
Mostrando 13-24 de 99 artigos, teses e dissertações.
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13. "Desenvolvimento de eletrodos de troca iônica eletroquímica para o tratamento de rejeitos contendo íons Cromo ou Césio" / DEVELOPMENT OF ELECTROCHEMICAL ION EXCHANGE ELECTRODES FOR THE TREATMENT OF WASTES CONTAINING CHROMIUM OR CESIUM IONS
Nowadays, environmental preservation using technologies that do not attack it, generating non-toxic residues and reduced volumes, has been discussed. Hazardous effluents, containing metals, as chromium, have been poured in the soils and rivers, degrading the water. Not different are the problems originated from some nuclear activities that generate wastes, a
Publicado em: 2006
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14. AvaliaÃÃo CinÃtica da Taxa de ReaÃÃo de DegradaÃÃo do Ãcido DicloroacÃtico via tecnologia de oxidaÃÃo avanÃada OzÃnio/UV: um estudo cinÃtico
With the current level of industrial activity the quantity of pollutants being rejected into the aquatic environment are constantly increasing. The removal of these products through conventional processes such adsorption, filtration, incineration or biological treatment is not always efficacious, since these methods are based on the simple transference of th
Publicado em: 2003
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15. Novel material for nickel recuperation
Graft polymerization of N-vinyl-2-pyrrolidone with chitin was studied using hydrogen peroxide for initiation. The capacity of the obtained VP-g-Ch graft copolymer for adsorption of nickel was examined. The effect of temperature, pH and solute concentration on the chelating properties of the grafted and ungrafted chitin were determined. The thermal profiles o
Materials Research. Publicado em: 2001
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16. Estudo das propriedades de troca ionica de silicofosfato de zirconio (IV)
Zirconium (IV) phosphosilicate (HZPS) was prepared by mixing solutions of sodium metasilicate with solutions of zirconium(IV) oxychloride. The resulting precipitates were further treated with phosphoric acid. Precipitation reactions were carried out at pH~9-10 and pH~6. The HZPS obtained at each pH showed similar exchange capacities. Thermogravimetric analys
Publicado em: 2000
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17. Oxido de niobio (v) enxertado sobre silica gel : estabilidade termica, acidez e reatividade de especies absorvidas
Silica gel was chemically modified with niobium(V) oxide was obtained reacting silanol groups of the silica gel surface with niobium pentachlorite, in organic solvent. The amount of niobium(V) oxide grafted on silica gel surface was 0.89 x 10mol.g. Only Nb(v) ion in the SiNb material were observed by XPS analysis. The binding energy values found for Nb were
Publicado em: 1994
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18. 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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19. Unitary cardiac Na+, Ca2+ exchange current magnitudes determined from channel-like noise and charge movements of ion transport.
The cardiac Na+, Ca2+ exchanger (NCX1) is thought to achieve a high turnover rate, but all estimates to date are indirect. Two new strategies demonstrate that maximum unitary exchange currents are about 1 fA (6000 unitary charges per s) and that they fluctuate between on and off levels similar to ion channel currents. First, exchange current noise has been i
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20. Chloride and Potassium Activities in Luminal Fluid of Turtle Thyroid Follicles as Determined by Selective Ion-Exchanger Microelectrodes
Cl- and K+ activities in the follicular lumen and the intraluminal potential of the same lumen were measured simultaneously with specific liquid ion-exchanger and 3 M KCl microelectrodes, respectively, in turtle thyroid glands. The Cl- equilibrium potential between the thyroid interstitium and the lumen calculated from the measured Cl- activities was higher
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21. Transport of K+ by Na(+)-Ca2+, K+ exchanger in isolated rods of lizard retina.
Transport of K+ by the photoreceptor Na(+)-Ca2+, K+ exchanger was investigated in isolated rod outer segments (OS) by recording membrane current under whole-cell voltage-clamp conditions. Known amounts of K+ were imported in the OS through the Ca(2+)-activated K+ channels while perfusing with high extracellular concentration of K+, [K+]o. These channels were
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22. An exchanger-like protein underlies the large Mg2+ current in Paramecium
There are very few molecules known to transport Mg2+ in eukaryotes. The membrane of Paramecium tetraurelia passes a large Mg2+-selective current and exhibits a corresponding backward swimming behavior. Both are missing in a group of mutants called eccentric. By sorting an indexed WT genomic library through microinjection into the macronucleus, we have isolat
National Academy of Sciences.
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23. A Model of Na+/H+ Exchanger and Its Central Role in Regulation of pH and Na+ in Cardiac Myocytes
A new kinetic model of the Na+/H+ exchanger (NHE) was developed by fitting a variety of major experimental findings, such as ion-dependencies, forward/reverse mode, and the turnover rate. The role of NHE in ion homeostasis was examined by implementing the NHE model in a minimum cell model including intracellular pH buffer, Na+/K+ pump, background H+, and Na+
The Biophysical Society.
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24. Hypertensive sodium-proton exchanger phenotype persists in immortalized lymphoblasts from essential hypertensive patients. A cell culture model for human hypertension.
An enhancement of sodium-proton exchange activity is a frequently observed ion transport abnormality in essential hypertension. The cellular basis for this has not yet been elucidated. Due to the lack of a specific cell culture system it has been impossible to distinguish between intrinsic cellular abnormalities and influences exerted by the hypertensive neu