Ion Exchanger
Mostrando 1-12 de 99 artigos, teses e dissertações.
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1. PROPRIEDADES E AVALIAÇÃO CATALÍTICA DA ZEÓLITA X NANOMÉTRICA CONTENDO CÁTIONS METILAMÔNIO
The reduction of zeolite particle is one of the main features currently searched; it is due to the catalytic gains that these materials come in some reactions. In this work two faujasite zeolites of type X were evaluated, a micrometer and nanometric. Zeolites in sodium form were exchanged ionically with methylammonium cations. These materials were evaluated
Quím. Nova. Publicado em: 2016-07
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2. Development of an optical redox chemical sensor for nitrite determination
An optical chemical sensor for the determination of nitrite based on incorporating methyltrioctylammonium chloride as an anionic exchanger on the triacetylcellulose polymer has been reported. The response of the sensor is based on the redox reaction between nitrite in aqueous solution and iodide adsorbed on sensing membrane using anion exchange phenomena. Th
Química Nova. Publicado em: 2012
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3. DETERMINAÇÃO DAS CONSTANTES DE ESTABILIDADE DOS COMPLEXOS FORMADOS ENTRE OS AMINOÁCIDOS CISTEÍNA, N-ACETILCISTEÍNA E LISINA COM CHUMBO EM SOLUÇÃO AQUOSA / DETERMINATION OF STABILITY CONSTANTS FOR LEAD COMPLEXES WITH CYSTEINE, N-ACETYLCYSTEINE AND LYSINE IN AQUEOUS SOLUTIONS
In this study we investigated the interaction between lead and the amino acid cysteine, lysine and N-acetylcysteine by testing long-term contact with ion exchanger resins and also the determination of stability constants. The importance of investigating the presence of lead in solutions for parenteral nutrition is related to the risk of internal contaminatio
Publicado em: 2011
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4. Comparação entre um trocador aniônico de sal de amônio quaternário de quitosana e um trocador comercial na extração de fósforo disponível em solos
The present work aimed modify chemically the chitosan (QTS) surface to obtain a reticulate chitosan quaternary ammonium salt (SAQQR), and compare this anionic exchanger with an commercial ion exchanger in the extraction of available phosphorus in soils. The results showed that the two exchangers are identical, extracting similar and proportional quantities o
Química Nova. Publicado em: 2010
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5. Comparison of two purified toxic fractions from Mesobuthus eupeus scorpion venom
Iranian scorpions belong mainly to the Buthidae and Scorpionidae families, distributed into 16 genera and 25 species. In Iran, similar to other parts of the world, there are a few known species of scorpions responsible for severe envenoming; amongst which Mesobuthus eupeus is the most common. Its venom contains several toxin fractions that may affect the ion
Journal of Venomous Animals and Toxins including Tropical Diseases. Publicado em: 2010
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6. Equilibrium study of binaries and ternary ion exchange systems envolving copper, cadmium and calcium ions by alginate biopolymer / Estudo do equilibrio dos sistemas binarios e ternario de troca ionica dos ions cobre, cadmio e calcio pelo biopolimero alginato
In this work, it was studied the ion exchange process involving copper, cadmium and calcium ions. The heavy metals, copper and cadmium, were evaluated due to its high toxicity, its presence in industrial effluent and difficulty in its removal when in low concentrations, however, above permitted levels by law. Alginate was used as ionic exchanger. In the pres
Publicado em: 2009
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7. Study of the Na+/H+ (NHE3) exchanger gene promoter region. / Estudo da região promotora do gene do permutador Na+/H+ (NHE3).
In view of the importance of the exchanger Na+/H+ (isoform 3), in reabsoption of NaCl and NaHCO3 in proximal tubules and consequently the acid-base balance, and cell volume, came the interest in identifying the region promoter essential for transcription of the NHE3 gene and the elements of the binding of transcription factors present in the same, in cells r
Publicado em: 2009
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8. Cromatografia negativa em Sepharose-TREN como tecnica de purificação de proteinas adicionadas artificialmente a extrato de soja / Negative chromatography on Sepharose-TREN as a technique of proteins purification artificially added to soybean extract
In recent years, plants have been studied as bioreactors for the production of recombinant proteins with industrial and pharmaceutical interest. When compared to other expression systems, plants have several advantages, such as the possibility of posttranlationals modification, low production cost, low risk of contamination by human pathogens, and the accumu
Publicado em: 2009
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9. Estudo de equilÃbrio de troca iÃnica de sistemas binÃrios e ternÃrios por meio de redes neurais / Ion exchange equilibrium of the binary and ternary systems using neural network and mass action law
In the majority of the applications of the process of ionic exchange in the chemical industry some ionic species are gifts that compete between itself for the active small sieges of the ionic exchanger. Therefore, the project of these systems requires an analysis of the coefficients of selectivity of ions gifts in the solution that determines the influence o
Publicado em: 2009
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10. Preparação e propriedades de novos polimeros anion-trocadores cloreto de n-Propil (metilpiridinio) silsesquioxano / Preparation and properties of the new anion-exchanger n-propyl (methylpyridinium) silsesquioxane chloride polymers
Este trabalho reporta a preparação, caracterização e aplicação de novos polímeros íon-trocadores denominados cloreto de 3-n-propil (3-metilpiridínio) silsesquioxano e cloreto de 3-n-propil (4-metilpiridínio) silsesquioxano, obtidos a partir da incorporação de quantidades variáveis de grupos metilpiridínio aos materiais. Os polímeros obtidos se
Publicado em: 2008
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11. SYNTHESIS AND CHARACTERIZATION OF INORGANIC ION EXCHANGERS BASED ON MIXED OXIDE TIN-TITANIUM TO BE USED IN RECOVERY OF CADMIUM AND NICKEL AND PHOTOLUMINESCENT STUDIES / Síntese e caracterização de trocadores iônicos inorgânicos a base de óxidos mistos Estanho-Titânio para utilização na recuperação de Cádmio e Níquel e estudos fotoluminescentes
This work presents the synthesis, characterization and adsorption studies of inorganic ion exchangers based on mixed tin-titanium oxide for recovery of cadmium and nickel metals from aqueous effluents, discarded in the environment mainly through Ni-Cd battery. The exchangers were synthesized by sol-gel modified method using a mixture of tin(IV) chloride and
Publicado em: 2007
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12. Leptospirose letal aguda em Hamster: caracterização de perfis bioquímicos, histopatológicos e celulares renais, relacionada a ensaios terapêuticos / Reversal of renal tubule transporter down-regulation during severe leptospirosis with antimicrobial therapy
Leptospirosis is a zoonosis of worldwide distribution. About 5-10% of all human infections presents with severe forms. Weils syndrome, the most common presentation of severe forms of leptospirosis, may courses either as a single monophasic disease or as a disease with prolonged course, characterized by a combination of hemorrhage, particularly in the lung, r
Publicado em: 2007