Resin Transfer
Mostrando 25-36 de 41 artigos, teses e dissertações.
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25. Concentration of alpha-lactalbumin from cow milk whey through expanded bed adsorption using a hydrophobic resin
The design of novel applications for the use of new high-density adsorbents in the direct recovery of proteins requires analysis of the fluid dynamics and mass transfer characteristics of the column used with the solid-liquid system. In this article we describe the operating parameters related to the use of a high-density, hydrophobic resin (Streamline® Phe
Brazilian Journal of Chemical Engineering. Publicado em: 2005-12
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26. Recuperação de acidos graxos livres em resina de troca ionica. / Recuperation of free fatty acids in ion exchange resins.
The drastic operational conditions used in the chemical or physical refining of edible oils can in some cases lead to losses of nutraceutical compounds, high losses of neutral oil or even to the darkening of the end product. Liquid-liquid extration can be used as an alternative refining process, since mild operation conditions are employed in this case. But
Publicado em: 2005
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27. Biomechanics load transmission single implants according to prosthetic materials photoelastic and dinamic analysis / "Biomecânica da transmissão de cargas a implantes unitários em função dos materiais protéticos: análise fotoelástica e dinâmica"
Less rigid oclusal materials such as acrylic resins are often used in prosthesis over implants because they are supposed to diminish the loads transferred to the bone; however there is no scientific evidence to support this theory. The objective of this work was to compare by photoelastic and dynamic analysis the load transfer after oclusal loads over single
Publicado em: 2005
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28. Adsorption of aromatic amino acids in a fixed bed column
Phenylalanine (Phe) and tyrosine (Tyr) are two of the twenty amino acids in proteins; they are classified as aromatic amino acids, because both have a benzene ring in their structures. These amino acids are important in the synthesis of several biologically active amines, such as beta-endorphin, a neurotransmitter. Amino acids can be separated by ion-exchang
Brazilian Journal of Chemical Engineering. Publicado em: 2003-09
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29. Parameters estimation for amino acids adsorption in a fixed bed by moment analysis
Equilibrium constant and mass transfer parameters are needed for the study of amino acid separation in any process involving adsorption in fixed beds. The adsorption constants, effective diffusion coefficients, and axial dispersion coefficients for two amino acids, L-phenylalanine (Phe) and L-tyrosine (Tyr), are determined from a series of pulse tests in a f
Brazilian Journal of Chemical Engineering. Publicado em: 2001-06
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30. Estudo da adsorção de inulinases em colunas com resinas de troca ionica : paramentros experimentais e modelagem
The inulinases are enzymes with great commercial potencial, as they hydrolise inulin producing important products for the food industry such as fructose and fructose oligomeres. The separation and purification of these enzymes, with efficiency and compatible costs, is of great importance to the development of adsorption techniques and protocols which may opt
Publicado em: 2000
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31. Modelagem e simulação de purificação de cefalosporina C em coluna de leito fixo
In the "cephalosporin C" production process, the purification is the second step, after the antibyotic been produced by Cephalosporium acremonium in submerged cultures. The purification is carried on in ionic exchange columns. In this work a mathematical model to describe the adsorption process is suggested. The model was obtained from a mass balance and kin
Publicado em: 1996
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32. Mechanisms and prevention of trifluoroacetylation in solid-phase peptide synthesis
A novel mechanism for trifluoroacetylation in solid-phase peptide synthesis, independent of the coupling step, has been elucidated. It involves the presence of trifluoroacetoxymethyl groups on the resin support, which react with resin-bound amines by an intersite nucleophilic reaction. The trifluoroacetoxymethyl groups are generated from preexisting hydroxym
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33. Chromatography of Cytokinins on a Neutral Polystyrene Resin: A Simple Procedure for the Separation of the cis and trans Isomers of Zeatin or Ribosylzeatin 1
A simple procedure for the separation of the cis and trans isomers of zeatin and ribosylzeatin by column chromatography on a neutral polystyrene resin, Porapak Q, in aqueous ethanol solutions is reported. The method has been used to examine the stereoisomer composition of ribosylzeatin isolated from wheat germ transfer RNA. Chromatographic data for several o
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34. Portion-mixing peptide libraries of quenched fluorogenic substrates for complete subsite mapping of endoprotease specificity.
A solid-phase assay for the complete subsite mapping of the active site of endoproteases has been developed. A library of resin-bound protease substrates was synthesized both on kieselguhr-supported polyamide resin and on a polyethylene glycol-poly-(N,N-dimethylacrylamide) copolymer type of resin that allows proteases to diffuse into the interior and perform
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35. A peptide-based fluorescence resonance energy transfer assay for Bacillus anthracis lethal factor protease
A fluorescence resonance energy transfer assay has been developed for monitoring Bacillus anthracis lethal factor (LF) protease activity. A fluorogenic 16-mer peptide based on the known LF protease substrate MEK1 was synthesized and found to be cleaved by the enzyme at the anticipated site. Extension of this work to a fluorogenic 19-mer peptide, derived, in
The National Academy of Sciences.
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36. Abietadiene synthase catalysis: Mutational analysis of a prenyl diphosphate ionization-initiated cyclization and rearrangement
Abietadiene synthase catalyzes the committed step in resin acid biosynthesis, forming a mixture of abietadiene double-bond isomers by two sequential, mechanistically distinct cyclizations at separate active sites. The first reaction, protonation-initiated cyclization, converts the universal diterpene precursor geranylgeranyl diphosphate to the stable bicycli
The National Academy of Sciences.