Membrane Filters
Mostrando 1-12 de 331 artigos, teses e dissertações.
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1. Development of a ceramic membrane for emulsion water-diesel treatment
Abstract The purpose of this study was the development of a low-cost ceramic tubular membrane, using inexpensive materials, namely natural clay, and graphite as a porogenic agent. Such a low-cost membrane can be used as filters or porous supports for the preparation of multilayer ceramic membranes. Extrusion was used as a shape-forming method for this purpos
Cerâmica. Publicado em: 2022
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2. Formação de biofilmes microbianos em membranas poliméricas de poliamida e polietersulfona e seu controle por agentes sanitizantes / Microbial biofilms formation in polymeric membranes of polyamide and polyethersulfone and its control by sanitizers agents
O grande consumo de águas minerais tem alavancado muitos estudos de relação caracterização microbiológica, nas mais diversas regiões brasileiras. Trabalhos revelam que a grande maioria das águas brasileiras envasadas e águas de poços artesianos possuem contaminação microbiana, causando grande preocupação com relação à qualidade da água a se
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/11/2011
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3. Técnicas analíticas para autópsia de membranas de osmose reversa. / Analytical techniques for the autopsy of reverse osmosis membranes.
Sistemas de membranas filtrantes, principalmente os de osmose reversa, estão sendo cada vez mais utilizados em diversos seguimentos de empresas (farmacêutica, tratamento de água, alimentícia e química), devido à diminuição do preço dos elementos filtrantes e da alta qualidade do produto obtido. Apesar do preço dos elementos de osmose reversa terem
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2011
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4. Caracterização de membranas de poliamida 66 preparadas pelo método de inversão de fases
In the present study, polyamide 66 (PA 66) membranes were prepared by phase inversion (PI) and characterized in order to verify their potential application in separation processes. PA 66 membranes were prepared using two different solvents, formic acid (FA) and chloridric acid (HCl), and water as a non-solvent. Membranes prepared in film form (not supported)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2010
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5. Evaluation of acrosomal status and sperm viability in fresh and cryopreserved specimens by the use of fluorescent peanut agglutinin lectin in conjunction with hypo-osmotic swelling test
OBJECTIVE: In this study, we evaluated whether the hypo-osmotic swelling test (HOST) can be used as a vital marker in combination with peanut agglutinin (PNA) - labeling in fresh and cryopreserved spermatozoa. MATERIALS AND METHODS: Human sperm populations were exposed to a hypo-osmotic medium for 60 minutes, and then incubated in a 1 µg/mL solution of the
International braz j urol. Publicado em: 2007-06
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6. Avaliação da eficiência de filtros anaeróbios na remoção de coliformes fecais e ovos de helmintos
The technology of anaerobic reactors for sanitary wastewater treatment has been extensively developed in Brazil, and today it is practically consolidated. They present several advantages, such as low construction and operating costs, and low sludge production, the anaerobic reactors are an attractive alternative to minimize problematic lack of basic sanitati
Publicado em: 2007
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7. Development of dissolved oxygen sensors using electrochemical and optic methods for real time monitoring of water quality. / Desenvolvimento de sensores de oxigênio dissolvido utilizando métodos eletroquímicos e ópticos para monitoramento em tempo real da qualidade da água.
This work aims the development of a dissolved oxygen (DO) sensor using thick film technology, which has low cost of production and keeps sensors durability and precision acceptable for their use in the monitoring of water sources. This development also includes the complete electronic circuits for autonomous monitoring. Using the principles of oxygen electro
Publicado em: 2007
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8. An improved method for concentrating rotavirus from water samples
A modified adsorption-elution method for the concentration of seeded rotavirus from water samples was used to determine various factors which affected the virus recovery. An enzyme-linked immunosorbent assay was used to detect the rotavirus antigen after concentration. Of the various eluents compared, 0.05M glycine, pH 11.5 gave the highest rotavirus antigen
Memórias do Instituto Oswaldo Cruz. Publicado em: 2001-08
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9. Substâncias húmicas: sistema de fracionamento sequencial por ultrafiltração com base no tamanho molecular
A sequential system for fractionation by ultrafiltration (SSFU) equipped with advanced membranes filters (molecular size cut-off: 5, 10, 30, 50 and 100 kDalton) of the polyethersulfone type was developed for analytical fractionation of humic substances (HS) extracted from aquatic systems or soils. The device consists of five membrane filters (Sartocon® Micr
Química Nova. Publicado em: 2000-06
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10. Production of inulinase: recovery and scale-up / Obtenção de inulinase: recuperação e ampliação de escala
It has been observed that the production of extracellular inulinase by Candida kefyr DSM 70106 was markedly affected by the rate of oxygen transfer to the medium. The highest inulinase activity (37,5 U.Ml-1) was attained at a KLa value (volumetric coefficient of oxygen transfer) equal to 43 h-1. As such, KLa was chosen as a criterion for scaling-up the biore
Publicado em: 1995
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11. Identificação e enumeração rapidas de Escherichia coli e Salmonella typhimurium no ovo de galinha atraves da tecnica da membrana filtrante / Identification and rapid enumeration of Escherichia coli and Salmonella typhimurium in chicken eggs by the technique of filtering membrane
Dentro da linha de pesquisa de identificação e enumeração rápida de microrganismos, o presente trabaiho foi realizado no sentido de verificar a viabilidade do emprego da membrana filtrante na recuperação de Escherichia cali e Salmanella trphimurium, inoculadas experimentalmente em ovo de galinha (clara, gema e ovo liquido). Após ó tratamento com a p
Publicado em: 1984
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12. Comparison of Autoclave and Ethylene Oxide-Sterilized Membrane Filters Used in Water Quality Studies
Autoclave and ethylene oxide-sterilized membrane filters manufactured by Gelman, Millipore, and Sartorius were field tested for their recovery of total coliforms, fecal coliforms, fecal streptococci, and heterotrophs. The data were analyzed by using split-plot analysis of variance and significance tests. Membranes were also tested for pH and toxicity using E