Liquid Membranes
Mostrando 13-24 de 247 artigos, teses e dissertações.
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13. Fases de membranas fluidas -L3 a partir de lipídio sintético e pentanol na região diluída - e o respectivo dialisado / Phases membrane fluid - L3 from synthetic lipid and pentanol and diluted in the region corresponding dialyzed
A fase L3 (esponja) foi observada no final dos anos 80 e representa uma nova classe de auto moldagem para sistemas surfactantes em água. Esse trabalho descreve a descoberta e a posterior caracterização de uma fase ternária composta do lipídio sintético catiônico brometo de dioctadecildimetil amônio (DODAB), pentanol e água, em uma região diluída.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/07/2012
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14. EFEITO in vitro DE Paullinia cupana NO METABOLISMO OXIDATIVO DE ESPERMATOZÓIDES HUMANOS EXPOSTOS AO CLORETO DE METILMERCÚRIO / EFFECT OF Paullinia cupana in vitro oxidative metabolism HUMAN SPERM EXPOSED TO CHLORIDE METHYLMERCURY
Investigations suggests that methylmercury (MeHg) toxicitiy is related to oxidative stress promotion caused by lipid peroxidation of cell membranes as well as genotoxicity. The methylmercury (MeHg) exposition causes production of adverse effects as deterioration of semen quality, testicular degeneration, and male reproductive failure. Since human sperm is a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/02/2012
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15. Inclusion separation of alkali metals in emulsion liquid membranes by nanobaskets of calix[4]crown-3
Nano-assisted inclusion separation of alkali metals from basic solutions was reported by an inclusion-facilitated emulsion liquid membrane process. The novelty of this study is application of nanobaskets of calixcrown in the selective and efficient separation of alkali metals as both the carrier and the surfactant. For this purpose, two diacids, p-tert-butyl
Braz. J. Chem. Eng.. Publicado em: 2012-12
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16. Viability in the production of a drug extracted from Ananas comosus by a flat membrane system
The aim of this work was to study the production of e bromelain from the Ananas comosus L. Merril, by determining the process conditions using flat membranes. The production system modeling generated a hyperbolical curve and the optimization by response surfaces showed an influence of the transmembrane pressure higher than the pH influence. The cost of the p
Brazilian Archives of Biology and Technology. Publicado em: 2012-06
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17. Elicitores abióticos no estresse oxidativo e na expressão de gene da rota de betacianina em Alternanthera philoxeroides (Mart.) Griseb. / Abiotic elicitors in oxidative stress and in gene expression of the betacyanin route in Alternanthera philoxeroides (Mart.) Griseb
The medicinal Alternanthera (Amaranthaceae) species, such as A. philoxeroides, present a great variety of bioactive compounds, among which are the betacyanins, nitrogen pigments that belong to the betalains class. These compounds are widely used as additives for food and drugs, due to their antioxidant action and lack of toxicity, which have already been pro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/10/2011
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18. Separação de CO2 em gases de combustão : aplicação de membranas e criogenia
Este trabalho tem por objetivo avaliar a viabilidade técnica de processos de separação de gás carbônico em correntes de gases de combustão. Neste sentido, a separação por meio de membranas e por criogenia são avaliadas por meio de simulação de sistemas. As propostas envolvendo membranas avaliam arranjos de membranas em série, os quais são otimiz
Publicado em: 2010
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19. Effect of freezing methods on the properties of lyophilized porous silk fibroin membranes
Silk fibroin is a fibrous protein that has been extensively studied for application in the biomedical field, and has been used as a scaffold for bone tissue engineering. Biomaterials made of proteins are prone to physical and chemical degradation during storage; lyophilization, a drying method that consists of freezing and drying steps, is known to promote m
Materials Research. Publicado em: 2009-06
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20. IMMOBILIZATION AND RELEASE STUDY OF A RED ALGA EXTRACT IN HYDROGEL MEMBRANES / Estudo da incorporação e liberação de um extrato de algas vermelhas em membranas de hidrogel
In pharmaceutical technology hydrogel is the most used among the polymeric matrices due to its wide application and functionality, primarily in drug delivery system. In view of the large advance innovations in cosmetic products, both through the introduction of new active agents as the matrices used for its controlled release, the objective of this study was
Publicado em: 2009
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21. Geometria, Topologia e Elasticidade: aplicações a membranas e outros sistemas bidimensionais
Geometry, topology and elasticity are found in various branchs of physics and they play important roles in the understanding of many physical phenomena. In this work, we present three diferent systems where we can see such importance. First, a quantum neutral particle, constrained to move on a conical surface, is used as a toy model to explore bound states d
Publicado em: 2009
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22. Efeitos de terpenos nas membranas de estrato córneo estudados por ressonância paramagnética eletrônica / Effects of terpenes on the stratum corneum membranes studied by electron paramagnetic resonance
The interaction of the skin penetration enhancers DL-menthol, -terpineol, 1,8-cineole and (+)-limonene with membranes of the uppermost skin layer, the stratum corneum (SC) and with multilamellar vesicles from 1,2-dipalmitoyl-sn-glycero-3-phosphaticylcholine (DPPC)is investigated by electron paramagnetic resonance (EPR) spectroscopy using spin-labeled
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2008
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23. Phytochemical study of the species Serjania lethalis St. Hil. / Estudo fitoquímico da espécie Serjania lethalis St. Hil.
The brazilian is biodiversity considered one of higher of the world, is a bit know and explored as the source of drugs medicines. In search of new bioactive molecules the etanolic extract of stem of Serjania lethalis St. Hil was studied in for the molluscicide, miracicide and shistossomicida activity. The specie S. lethalis was collected in Brasilia and a vo
Publicado em: 2008
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24. Metalloporphyrins and salen complexes as a P450 biomimetic model for the metabolism of antiepileptic and antidepressant drugs / Metaloporfirinas e compostos salen como modelos biomiméticos do citocromo P450 no metabolismo de fármacos anticonvulsivante e antidepressivo
In this work, the catalytic activities of metalloporphyrins and the salen complex (Jacobsen catalyst) in solution and immobilized on different supports were studied in the oxidation of hydrocarbons, anticonvulsivant drugs (carbamazepine and primidone) and antidepressives (fluoxetine) by the following oxygen donors: hydrogen peroxide, terc-butyl hydroperoxide
Publicado em: 2008