Ion Selective Membranes
Mostrando 1-12 de 64 artigos, teses e dissertações.
-
1. Aplicação da técnica de eletrodiálise no tratamento de efluentes de tingimento de gemas contendo íons nitrato e cromo
The dyeing agate employs large quantities of potentially harmful wastewater to the environment, such as, effluent with chromium and nitrate ions. The aim of the present study was investigate the electrodialysis technique efficiency in the removal of contaminant ions present in wastewater generated by the agate dyeing industry and evaluate the toxicity of the
Quím. Nova. Publicado em: 2016-12
-
2. Enzyme-based Colorimetric and Potentiometric Biosensor for Detecting Pb (II) Ions in Milk
The aim of the present work was to study a simple colorimetric and potentiometric biosensor based on urease inhibition by Pb (II) ions for its estimation in milk samples. Urease immobilized on nylon membrane by hydrosol gel method was used as the biocomponent to demonstrate the metal effect on the enzyme activity using phenol red as the pH indicator. A lower
Braz. arch. biol. technol.. Publicado em: 2014-08
-
3. Polímeros impressos com íons: fundamentos, estratégias de preparo e aplicações em química analítica
Chemical imprinting technology has been widely used as a valuable tool in selective recognition of a given target analyte (molecule or metal ion), yielding a notable advance in the development of new analytical protocols. Since their discovery, molecularly imprinted polymers (MIPs) have been extensively studied with excellent reviews published. However, stud
Quím. Nova. Publicado em: 2013
-
4. Desenvolvimento de membranas íon-seletivas com poliestireno sulfonado e polianilina dopada para a aplicação em eletrodiálise
Atualmente, a preocupação com a redução da poluição industrial tem motivado os pesquisadores na busca de novas tecnologias para o tratamento de resíduos industriais. Tecnologias limpas, como a eletrodiálise, são capazes de tratar alguns destes resíduos, como por exemplo o efluente da indústria de galvanoplastia, minimizando os impactos que ocorrer
Publicado em: 2010
-
5. Caracterização química e atividade biológica de peptídeos presentes na peçonha do escorpião brasileiro Opisthacanthus cayaporum
Scorpions venom is a rich source of molecules with variable functions. The most studied are those that act on ion channels, particularly those selective for Na + and K +, which are responsible for the cell excitability. Besides these compounds, a family of peptides without disulfide bridges, called NDBP (Non Dissulfide Brigded Peptides), which act as pores f
Publicado em: 2009
-
6. Recentes avanços e novas perspectivas dos eletrodos íon-seletivos
This paper describes the recent progress in the development of polymeric membranes for ion-selective electrodes. The importance of knowing the mechanism of potential development in membranes for ion-selective electrodes to reach lower detection limits and improve selectivity are discussed. Recent advances and future trends of research on ion-selective electr
Química Nova. Publicado em: 2006-10
-
7. Recuperação da água de retenção do processo de eletrodeposição de ouro por eletrodiálise
Este trabalho teve como objetivo avaliar a possibilidade de empregar a técnica de eletrodiálise (ED) para recuperar a água de retenção de um processo de eletrodeposição de ouro. A água de retenção é originária do enxágüe das peças após a eletrodeposição do ouro, realizada em banho alcalino a base de ouro e cianeto. Neste enxágüe é removi
Publicado em: 2006
-
8. Construção e avaliação de eletrodos seletivos ao antibiotico tiamulina
The antibiotic tiamulin hydrogen fumarate can be assayed by using ion-selective electrodes. These electrodes can be made with membranes of PVC or ethylene/vinyl acetate copolymer (EVA) with the ionic pairs tiamulin tetraphenylborate and tiamulin phosphotungstate. Most of the ion-selective electrodes prepared showed nernstian response in the range from 1,0 x
Publicado em: 1995
-
9. Construction and evolution copperand silver ion selective electrode based on crystalline solid membranes / Construção e avaliação de eletrodos de membrana sólida cristalina seletivos a cobre e prata
O presente trabalho visou a construção e avaliação de eletrodos de membrana sólida cristalina seletivos a cobre e prata. Obteve-se o sulfeto de prata, material eletroativo usado na preparação de membranas seletivas a íons Ag+, por precipitação com gás sulfídrico em meio ácido. Eletrodos com membranas de 1,0 e 0,50 mm de espessura apresentaram re
Publicado em: 1988
-
10. Anion, cation, and zwitterion selectivity of phospholemman channel molecules.
Phospholemman (PLM), a 72-amino acid membrane protein with a single transmembrane domain, forms taurine-selective ion channels in lipid bilayers. Because taurine forms zwitterions, a taurine-selective channel might have binding sites for both anions and cations. Here we show that PLM channels indeed allow fluxes of both cations and anions, making instantaneo
-
11. The Vpu protein of human immunodeficiency virus type 1 forms cation-selective ion channels.
Vpu is a small phosphorylated integral membrane protein encoded by the human immunodeficiency virus type 1 genome and found in the endoplasmic reticulum and Golgi membranes of infected cells. It has been linked to roles in virus particle budding and degradation of CD4 in the endoplasmic reticulum. However, the molecular mechanisms employed by Vpu in performa
-
12. Classification of ion channels in the luminal and abluminal membranes of guinea-pig endocardial endothelial cells.
1. The ion channels on both the luminal and abluminal membranes of endocardial endothelial (EE) cells were separately recorded using the patch clamp technique in the guinea-pig heart. 2. The major population consisted of two types of non-selective cation channels, which showed open probabilities of 0.21 and 0.33 at the resting potential, and conductances of