J. A. Teixeira

Monitorização da qualidade do leite de cabra durante a pasteurização e processamento óhmico usando sensores de fibra óptica (2007)

Martins, Rui C., Coelho, A. M., Lopes, Vítor V., Pereira, Ricardo, Teixeira, J. A., Vicente, A. A.

Este estudo avalia a viabilidade da espectroscopia UVVIS- SWNIR na degradação da qualidade do leite de cabra durante a pasteurização e aquecimento Ohmico. Foram utilizados: i) leite de cabra cru;...

The bubble size distribution and O2 mass transfer in an oscillating, meso-scale tube (2007)

Reis, N., Mena, P. C., Rocha, F. A., Vicente, A. A., Teixeira, J. A.

This work aims at characterizing bubble size distribution and its control in a small-scale, constricted tube in the presence of an oscillating flow. From previous works, it became clear that the full...

Production of fructooligosaccharides by aureobasidium sp. and aspergillus sp. (2007)

Dominguez, Ana, Nobre, C., Torres, D., Rocha, Orlando, Rodrigues, L. R., Rocha, I., ...

Relationships between partition coefficients of biomolecules in several aqueous popymer/polymer two-phase systems (2007)

Madeira, Pedro, Teixeira, J. A., Macedo, Eugénia, Mikheeva, Larissa M., Zaslavsky, Boris Y.

Biomolecules partition in aqueous (PEG + Na2SO4) two-phase system (2007)

Rodríguez, Oscar, Silvério, Sara C., Madeira, Pedro, Teixeira, J. A., Macedo, Eugénia

Characterization of liquid-liquid equilibria of aqueous two-phase systems containing a termosensible polymer (UCON) and sodium citrate (2007)

Tubío, Gisela, Venâncio, Armando, Teixeira, J. A., Nerli, Bibiana B., Picó, Guillermo A.

CONICET

Influence of the chemical structure of the polymer in the partition of proteins in aqueous two-phase systems (2007)

Silvério, Sara C., Madeira, Pedro, Martins, José Alberto, Marcos, João Carlos, Teixeira, J. A., Macedo, Eugénia

Comparative adsorption studies of proteose peptone component 3 on some hydrophobic interaction supports (2007)

Sousa, A., Passarinha, L. A., Rodrigues, L. R., Teixeira, J. A., Mendonça, A., Queiroz, J. A.

The role of osteopontin in tumour progression and metastasis in breast cancer (2007)

Rodrigues, L. R., Teixeira, J. A., Schmitt, Fernando C., Paulsson, Marie, Lindmark-Mässon, Helena

The use of cancer biomarkers to anticipate the outlines of disease has been an emerging issue, especially as cancer treatment has made such positive steps in the last few years. Progress in the...

Cloning and expression of frutalin, an alpha-dgalactose-binding plant lectin, in Pichia pastoris (2007)

Felix, W., Moreira, R. A., Teixeira, J. A., Domingues, Lucília

Adaptive evolution of a lactose-consuming saccharomyces cerevisiae recombinant (2007)

Guimarães, P., François, J., Parrou, J. L., Teixeira, J. A., Domingues, Lucília

The construction of Saccharomyces cerevisiae strains with the ability to efficiently ferment lactose has biotechnological interest, particularly for the alcoholic fermentation of cheese whey (a high...

Multiple gene disruption and marker rescue in the yeast Kluyveromyces marxianus (2007)

Ribeiro, Orquídea, Gombert, Andreas Karoly, Teixeira, J. A., Domingues, Lucília

Assessment of brewing yeast age based on selective bud scar staining and subsequent fluorescence measurement by flow cytometry (2007)

Lehnert, Radek, Kuřec, Michal, Brányik, Tomáš, Mota, André, Teixeira, J. A.

To study the yeast cell aging in continuous beer fermentation processes has a considerable practical significance. Hence, an expeditious method of yeast age estimation was developed based on...

Strategies for the prevention of microbial biofilm formation on silicone rubber voice prostheses (2007)

Rodrigues, L. R., Banat, Ibrahim M., Teixeira, J. A.

Total laryngectomy, a surgical treatment for extensive cancer of larynx, which alters swallowing and respiration in patients, is followed up with a surgical voice restoration procedure comprising...

Experimental approach for prebiotic oligosaccharides fractionation and chemical characterization (2007)

Torres, D., Dominguez, Ana, Rodrigues, L. R., Rocha, I., Cardoso, Susana M., Silva, Artur M. S., ...

Agência de Inovação - Projecto Biolife, PRIME 03/347

The impact of process parameters on flavour profile of alcohol-free beer from a single-stage continuous gas-lift reactor with immobilized yeast (2007)

Lehnert, Radek, Kuřec, Michal, Brányik, Tomáš, Teixeira, J. A.

In order to study the formation and conversion of the most important flavour compounds, the real wort used in alcohol-free beer fermentation was mimicked by a complex model medium containing glucose,...

Optimization of edible coating composition to retard strawberry fruit senescence (2007)

Ribeiro, Clara, Vicente, A. A., Teixeira, J. A., Miranda, Cândida

The ability of polysaccharide-based (starch, carrageenan and chitosan) coatings to extend the shelf-life of strawberry fruit (Fragaria ananassa) were studied, mainly for industrial applications. The...

Permeability and effective thermal conductivity of bisized porous media (2007)

Dias, Ricardo P., Fernandes, Carla S., Mota, M., Teixeira, J. A., Yelshin, Alexander

In the region of minimum porosity of particulate binary mixtures, heat exchange and permeability were found to be higher than the ones obtained with a mono-size packing built with the same small size...

Ganoderma : a portuguese fungal biofactory (2007)

Paterson, R. R. M., Dourado, Fernando, Lima, Nelson, Rodrigues, L. R., Teixeira, J. A.

Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions (2007)

Ruzene, Denise S., Gonçalves, A. R., Teixeira, J. A.

Sugar cane bagasse pulps were obtained by ethanol/water organosolv process under acid and alkaline conditions. The best condition of acid pulping for the sugarcane bagasse was 0.02 mol/L sulfuric...

Development of stable flocculent Saccharomyces cerevisiae strain for continuous Aspergillus niger β-galactosidase production (2007)

Teixeira, J. A., Lima, Nelson, Silva, Nancy A. Da, Domingues, Lucília

A flocculent Saccharomyces cerevisiae strain was engineered to stably secrete Aspergillus niger β-galactosidase in a continuous high-cell-density bioreactor. The δ-sequences from the yeast...

Modeling and simulation of fructo-oligosaccharides production (2007)

Rocha, Orlando, Dominguez, Ana, Nobre, C., Torres, D., Rodrigues, L. R., Teixeira, J. A., ...

It is foreseen that Systems Biology will have a great impact not only in Metabolic Engineering and Drug Discovery efforts, but also in Bioprocess development and optimization. In fact, the...

Edible coatings from galactomannans and their application to tropical fruits (2007)

Cerqueira, M. A., Lima, A. M. P., Moreira, H. H. T., Vicente, A. A., Teixeira, J. A., ...

Edible coatings play an important role in the quality and in the resistance to transportation, storage and display of a wide range of fresh and processed foods. Polysaccharide coatings with an...

Preparation of ingredients containing an ACE-inhibitory peptide by tryptic hydrolysis of whey protein concentrates (2007)

Pinho, O., Mota, M. V. T., Tavares, P., Pereira, A., Gonçalves, M. P., ...

This study describes the characterisation of whey protein hydrolysates obtained from tryptic hydrolysis to assess their application as ingredients with angiotensin-converting-enzyme (ACE) inhibitory...

Ohmic heating treatment of fruit puree (2007)

Machado, L., Vicente, A. A., Teixeira, J. A., Miranda, F.

Ohmic heating is an alternative pasteurization process and is growing interest in industry. Understanding the influence of ohmic heating on the sensorial and microbiological quality of foods is a...

Purification of fructo-oligosaccharides by adsorption onto charcoal filters (2007)

Nobre, C., Dominguez, Ana, Torres, D., Rocha, Orlando, Rodrigues, L. R., Rocha, I., ...

Production of fructo-oligosaccharides has received particular attention recently due to its beneficial effects as prebiotics. Fermentative processes appear to be a good technique for large scale...

Use of castor oil for aroma production by the yeast yarrowia lipolytica : optimization of operating conditions (2007)

Gomes, Nelma, Aguedo, Mário, Teixeira, J. A., Belo, Isabel

Comparison of chemical properties of food products processed by conventional and ohmic heating (2007)

Pereira, Ricardo, Pereira, M., Teixeira, J. A., Vicente, A. A.

The effect of ohmic and conventional heat processing of different food products on their chemical and physical parameters was studied. Depending on the food being analysed, parameters such as pH,...

Oxygen mass transfer to emulsions in bubble column contactor (2007)

Gómez Díaz, D., Gomes, Nelma, Teixeira, J. A., Belo, Isabel

Present work includes an exhaustive study about the oxygen absorption process by the analysis of volumetric mass transfer coefficient and the corresponding value of interfacial area between gas phase...

Permeability analysis in bisized porous media : wall effect between particles of different size (2007)

Dias, Ricardo P., Fernandes, Carla S., Teixeira, J. A., Mota, M., Yelshin, Alexander

The permeability of binary packings of glass beads with different size ratio – 13.3, 20, and 26.7, was investigated. In the Kozeny–Carman equation, the dependence of the tortuosity τ on the...

Chitosan coating surface properties as affected by plasticizer, surfactant and polymer concentrations in relation to the surface properties of tomato and carrot (2007)

Casariego, A., Souza, B. W. S., Vicente, A. A., Teixeira, J. A., Cruz, L., Díaz, R.

The objectives of this work were to determine the effects of the concentrations of glycerol and sorbitol (as hydrophilic plasticizers), Tween 80 (as surfactant) and chitosan on the wettability of...

Death kinetics of Escherichia coli in goat milk and Bacillus licheniformis in cloudberry jam treated by ohmic heating (2007)

Pereira, Ricardo, Martins, Joana, Mateus, C., Teixeira, J. A., Vicente, A. A.

The influence of ohmic heating on the death kinetic parameters of Escherichia coli ATCC® 25922 in goat milk and spores of Bacillus licheniformis ATCC® 14580 in cloudberry jam was investigated and...

Continuous immobilized yeast reactor system for complete beer fermentation using spent grains and corncobs as carrier materials (2006)

Brányik, Tomáš, Silva, Daniel Pereira Da, Vicente, A. A., Lehnert, Radek, Dostálek, Pavel, ...

Despite extensive research carried out in the last few decades, continuous beer fermentation has not yet managed to outperform the traditional batch technology. An industrial breakthrough in favour...

Continuous immobilized yeast reactor system for complete beer fermentation using spent grains and corncobs as carrier materials (2006)

Brányik, Tomáš, Silva, Daniel Pereira Da, Vicente, A. A., Lehnert, Radek, Dostálek, Pavel, ...

Despite extensive research carried out in the last few decades, continuous beer fermentation has not yet managed to outperform the traditional batch technology. An industrial breakthrough in favour...

Low-cost fermentative medium for biosurfactant production by probiotic bacteria (2006)

Complex systems challenges in bioengineering modelling and simulation (2006)

Potential use of alternative fermentative medium for biosurfactant production by Lactococcus lactis 53 and Streptococcus thermophilus A was studied. Suitable models were established to describe the...

Martins, Rui C., Vicente, A. A., Teixeira, J. A.

Bioengineering has a considerable potential for the use of complex systems (CS) in modelling and simulation. Biological systems are built on functional elements, where the large variety of existing...

Proof-of-concept of a novel micro-bioreactor for fast development of industrial bioprocesses (2006)

Reis, N., Gonçalves, C. N., Vicente, A. A., Teixeira, J. A.

The experimental performance of a novel micro-bioreactor envisaged for parallel screening and development of industrial bioprocesses has been tested in this work. The micro-bioreactor with an...

Motion of a magnetic flow follower in two-phase flow : application to the study of airlift reactor hydrodynamics (2006)

Klein, Jaroslav, Godó, Stefan, Teixeira, J. A.

A low-cost and simple magnetic particle tracer method was adapted to characterize the hydrodynamic behavior of an internal- and an external-loop airlift reactor (ALR). The residence time distribution...

Plant seed galactomannans as edible coatings (2006)

Cerqueira, M. A., Lima, A. M. P., Miranda, M. R. A., Moreira, H. H. T., Vicente, A. A., ...

Alfa-Valnatura; CNPq; CAPES; FUNCAP; UMinho; UFC.

Utilisation of controlled pore topology for the separation of bioparticles in a mixed-glass beads column (2006)

Mota, M., Teixeira, J. A., Yelshin, Alexander, Cortez, Susana

To study the flow of shaped particles in porous media, elution of spherical and rod-like micro-organisms was performed through beds of spherical glass beads. A 0.04 cm/s constant flow rate was used...

Purification of fructo-oligosaccharides by nanofiltration (2006)

Nobre, C., Dominguez, Ana, Torres, D., Rocha, Orlando, Rodrigues, L. R., Rocha, I., ...

Retarding strawberry fruit senesce with edible coatings : industrial application (2006)

Ribeiro, Clara, Vicente, A. A., Teixeira, J. A., Miranda, Cândida

Flavour formation in continuous fermentations (2006)

Brányik, Tomáš, Vicente, A. A., Dostálek, Pavel, Teixeira, J. A.

Fundação para a Ciência e a Tecnologia (FCT)

Oscillatory and alternate flows in a microfluidic device (2006)

Oliveira, Hugo Carneiro, Miranda, J. M., Teixeira, J. A., Vicente, A. A., Correia, J. H., Minas, Graça

The mixing properties of systems with oscillatory or alternate flows are studied by numerical methods. Preliminary results show that, for alternate flows, the contact area between high and low...

Tortuosity variation in a low density binary particulate bed (2006)

Dias, Ricardo P., Teixeira, J. A., Mota, M., Yelshin, Alexander

The importance of particle size ratio and particle composition in the properties of a mixed bed is well known. Nevertheless, the dependence of the bed channel tortuosity T on the porosity ε in the...

Isolation and partial characterization of a biosurfactant produced by streptococcus thermophilus A (2006)

Rodrigues, L. R., Teixeira, J. A., Mei, Henny Van Der

Isolation and characterization of the surface active components from the crude biosurfactant produced by Streptococcus thermophilus A was studied. A fraction rich in glycolipids was obtained by the...

Kinetics of lactose fermentation using a recombinant saccharomyces cerevisiae strain (2006)

Juraščík, Martin, Guimarães, P., Klein, Jaroslav, Domingues, Lucília, Teixeira, J. A., Markoš, J.

This work presents a multi-route, non-structural kinetic model for interpretation of ethanol fermentation of lactose using a recombinant flocculent Saccharomyces cerevisiae strain expressing both the...

Preliminary optimization study of alcohol-free beer production in a continuous immobilized cell reactor system (2006)

Lehnert, Radek, Brányik, Tomáš, Vicente, A. A., Dostálek, Pavel, Teixeira, J. A.

Grant Agency of the Czech Republic

Optimization of fermentation conditions for fructooligosaccharides productivity by aureobasidium (2006)

Dominguez, Ana, Nobre, C., Torres, D., Rodrigues, L. R., Rocha, I., Teixeira, J. A., ...

Novas técnicas cromatográficas (2006)

Mota, M., Teixeira, J. A., Yelshin, Alexander, Cortez, Susana

A cromatografia é um processo de separação muito especial, na medida em que permite separar compostos de misturas complexas com grande precisão. Mesmo elementos muito similares, como as...

Ohmic heating in a food application : quality evaluation of cloudberry jam (2006)

Lindbom, Ingela, Kerry, J., Nunes, Helena Trindade, Pereira, Ricardo, Gallagher, Maria Jose Sousa, Staruch, Ladislav, ...

New techniques for food processing are areas of interest for the food industry and ohmic heating is an example of a new technique where there are many possible applications in the food area. The aim...

Application of a novel oscillatory flow micro-bioreactor to the production of γ-decalactone in a two immiscible liquid phase medium (2006)

Reis, N., Gonçalves, C. N., Aguedo, Mário, Gomes, Nelma, Teixeira, J. A., Vicente, A. A.

A novel micro-bioreactor based on the oscillatory flow technology was applied to the scale-down of the biotechnological production of γ-decalactone. A decrease up to 50% of the time required to...

Biosurfactants: potential applications in medicine (2006)

Rodrigues, L. R., Banat, Ibrahim M., Teixeira, J. A.

The use and potential commercial application of biosurfactants in the medical field has increased during the past decade. Their antibacterial, antifungal and antiviral activities make them relevant...

Kinetic study of fermentative biosurfactant production by Lactobacillus strains (2006)

Rodrigues, L. R., Moldes, Ana, Teixeira, J. A.

Screening of biosurfactant-producing ability of four Lactobacillus strains was performed, being shown that for all the tested strains biosurfactant production occurred mainly in the first 4 h. The...

Interference in adhesion of bacteria and yeasts isolated from explanted voice prostheses to silicone rubber by rhamnolipid biosurfactants (2006)

Rodrigues, L. R., Banat, Ibrahim M., Mei, Henny Van Der, Teixeira, J. A.

Aims: The effects and extent of adhesion of four different bacterial and two yeast strains isolated from explanted voice prostheses to silicone rubber with and without an adsorbed rhamnolipid...

Nanotecnologias : que implicações para a segurança e saúde? (2006)

Trypsin hydrolysis of whey protein concentrates : characterization using multivariate data analysis (2006)

Mota, M. V. T., Oliveira, M. B. P., Rocha, Cristina, Teixeira, J. A., Torres, D., ...

Hydrolysis of whey protein concentrates (WPCs) was performed using trypsin under different combinations of temperatures and pH values in a total of three experiments, namely experiment A at 37 ºC...

Response surface optimization of the medium components for the production of biosurfactants by probiotic bacteria (2006)

Rodrigues, L. R., Teixeira, J. A., Mei, Henny Van Der

Optimization of the medium for biosurfactants production by probiotic bacteria (Lactococcus lactis 53 and Streptococcus thermophilus A) was carried out using response surface methodology. Both...

Inhibition of microbial adhesion to silicone rubber treated with biosurfactant from Streptococcus thermophilus A (2006)

Rodrigues, L. R., Mei, Henny Van Der, Banat, Ibrahim M., Teixeira, J. A.

Prova tipográfica (In Press)

Physicochemical and functional characterization of a biosurfactant produced by Lactococcus lactis 53 (2006)

Rodrigues, L. R., Teixeira, J. A., Mei, Henny Van Der

Isolation and identification of key components of the crude biosurfactant produced by Lactococcus lactis 53 was studied. Fractionation was achieved by hydrophobic interaction chromatography which...

Effects of ohmic heating technology in chemical properties of foods (2006)

Pereira, Ricardo, Pereira, Marta Duarte, Teixeira, J. A., Vicente, A. A.

In this work some food products where characterised chemically before and after ohmic and conventional heating treatments, comparing both processes. In each food type (cloudberry jam, goat milk) pH...

Death kinetics of Escherichia coli in goat milk and Bacillus licheniformis in cloudberry jam treated by ohmic heating (2006)

Pereira, Ricardo, Martins, Joana, Mateus, C., Teixeira, J. A., Vicente, A. A.

In recent years, the world’s food industry has focused increasing attention on electrical techniques of food processing. Ohmic heating is one of these techniques that can be considered as a high...

Kinetic model evaluation of ethanol fermentation from lactose (2006)

Juraščík, Martin, Klein, Jaroslav, Teixeira, J. A., Markoš, J.

This work presents a multi-route, nonstructural kinetic model for characterization of ethanol fermentation of lactose using a recombinant flocculent Saccharomyces cerevisiae strain expressing both...

Design of a lab-on-a-chip for clinical tests of human physiological fluids (2006)

Miranda, J. M., Minas, Graça, Vicente, A. A., Teixeira, J. A.

Labs-on-a-chip are useful to perform in situ clinical tests with instantaneous results. In this work, the design phase of the development of a lab-on-a-chip is presented. The device will be used to...

Adaptive evolution of a recombinant lactose-consuming Saccharomyces cerevisiae strain (2006)

Guimarães, P., Parrou, J. L., Le Berre, V., François, J., Teixeira, J. A., Domingues, Lucília

In previous work, a recombinant S. cerevisiae flocculent strain (NCYC869-A3/T1, or simply T1) with the ability to express both the LAC4 (coding for beta-galactosidase) and LAC12 (lactose permease)...

Effects of moderate electric fields on the chemical composition and microbial death kinetics of Escherichia coli and Bacillus licheniformis during pasteurization of some foodstuffs (2006)

Pereira, Ricardo, Vicente, A. A., Teixeira, J. A., Mateus, C., Pereira, M.

The influence of temperature and dissolved oxygen concentration on the microbiological and sensorial quality of strawberry puree pasteurized in a pilot-scale continuous ohmic heater (2006)

Machado, L., Vicente, A. A., Teixeira, J. A., Miranda, F.

New and simple plate test for screening relative transfructosylation activity of fungi (2006)

Dominguez, Ana, Santos, Isabel M., Teixeira, J. A., Lima, Nelson

Several microorganisms are reported to have transfructosylation activity due to fructosyltransferase and/or fructofuranosidase activities. However, the search for other fungi with higher...

Laccase activity from the fungus trametes hirsuta using an air-lift bioreactor (2006)

Rodríguez Couto, S., Rodríguez, A., Paterson, R. R. M., Lima, Nelson, Teixeira, J. A.

Aim: To produce high laccase activities from the white-rot fungus Trametes hirsuta in an in-house air-lift bioreactor (ALB). Methods and Results: Trametes hirsuta was grown in a 6-l ALB. A fed-batch...

Effect of solids on homogeneous–heterogeneous flowregime transition in bubble columns (2005)

Mena, P. C., Ruzicka, M. C., Rocha, F. A., Teixeira, J. A., Drahoš, J.

Experiments were conducted to study the effect of the presence of the solid phase on the homogeneous–heterogeneous flow regime transition in a bubble column 0.14m diameter. Air, distilled water and...

Simulation of liquid phase accumulation at centrifugal dewatering of activated sludge (2005)

Mota, M., Teixeira, J. A., Abaev, G. N., Yelshyna, I., Yelshin, Alexander

Centrifugation of activated sludge is a frequently used dewatering process but there is a need for a fitting function for moderate and high sludge concentrations. In particular, liquid phase...

Decalactone production by Yarrowia lipolytica under increased O2 transfer rates (2005)

Aguedo, Mário, Gomes, Nelma, Escamilla Garcia, E., Waché, Yves, Mota, M., Teixeira, J. A., ...

Yarrowia lipolytica converts methyl ricinoleate to γ-decalactone, a high-value fruity aroma compound. The highest amount of 3-hydroxy-γ-decalactone produced by the yeast (263 mg lˉ¹) occurred by...

Using image analysis in the study of multiphase gas absorption (2005)

Mena, P. C., Pons, M. N., Teixeira, J. A., Rocha, F. A.

For the air–water–calcium alginate beads system, the effect of the presence of solids on the mass transfer characteristics in a bubble column was experimentally studied. Volumetric liquid side...

Generation of gene disruption cassettes with long flanking regions via fusion PCR (2005)

Gombert, Andreas Karoly, Johansson, Björn, Lima, Nelson, Teixeira, J. A., Domingues, Lucília

Stable production of aspergillus niger β-galactosidase by delta-mediated chromosomal integration in flocculent saccharomyces cerevisiae (2005)

Teixeira, J. A., Lima, Nelson, Domingues, Lucília

An evolved recombinant plasmid-carrying Saccharomyces cerevisiae strain presenting an improved lactose consumption phenotype (2005)

Guimarães, P., Lima, Nelson, Teixeira, J. A., Domingues, Lucília

Production of dextran and fructose from carob pod extract and cheese whey by Leuconostoc mesenteroides NRRL B512(f) (2005)

Santos, Mariana, Rodrigues, Alírio, Teixeira, J. A.

The production of dextran and fructose from carob pod extract (CPE) and cheese whey (CW) as carbon source by the bacterium Leuconostoc mesenteroides was investigated. The influence of secondary...

Development of a new rapid method for monitoring frying fats quality (2005)

Castro, I., Pinto, D. B., Teixeira, J. A., Vicente, A. A.

Effect of solids on gas-liquid mass transfer and bubble characteristics in three-phase systems (2005)

Mena, P. C., Pons, M. N., Teixeira, J. A., Rocha, F. A.

Comunicação apresentada no "7th World Congress of Chemical Engineering" em Glasgow, Escócia, em Julho de 2005.

Peptide profile of whey protein hydrolysates from free and immobilised trypsin (2005)

Rocha, Cristina, Teixeira, J. A., Torres, D., Gonçalves, M. P., Mota, M. V. T., ...

Molecular yeast solutions for whey bioremediation (2005)

Domingues, Lucília, Guimarães, P., Klein, Jaroslav, Teixeira, J. A., Lima, Nelson

Fundação para a Ciência e a Tecnologia (FCT)

Kinetics of lactose fermentation using recombinant saccharomyces cerevisiae (2005)

Juraščík, Martin, Guimarães, P., Klein, Jaroslav, Domingues, Lucília, Teixeira, J. A., Markoš, J.

Slovak Scientific Grand Agency; FCT.

Yeast activity monitoring by fluorescent methods (2005)

Novak, J., Basarova, G., Fiala, J., Teixeira, J. A., Vicente, A. A.

Yeast activity was monitored during pilot plant yeast propagation under aerobic and anaerobic conditions. The work was carried out with three widely used Czech lager yeast strains. Fluorescent...

The challenging modelling of kLa in a periodic constricted small-scale tube (2005)

Reis, N., Vicente, A. A., Teixeira, J. A.

An extensive use in chemistry, biological and pharmaceutical laboratories is envisaged for a novel continuous screening reactor based on the oscillatory flow technology (Harvey, 2001). The basic unit...

Whey protein gelation : the effect of tryptic hydrolysis (2005)

Torres, D., Vicente, C. R., Teixeira, J. A., Gonçalves, M. P.

The ability of whey proteins (WP) to form heat induced gels and provide texture is desirable for some “solid like” foods like processed meat, dairy and bakery products. However, this property...

Retarding strawberry fruit senesce with edible coatings : case study (2005)

Ribeiro, Clara, Vicente, A. A., Teixeira, J. A., Miranda, Cândida

The objectives of this work were to study the ability of starch, carrageenan and chitosan based coatings to extend the shelf life of strawberry fruit (Fragaria ananassa). To do so, the surface...

Hidrólise de concentrado proteico de soro de queijo com tripsina imobilizada em resíduos da indústria cervejeira (2005)

Rocha, Cristina, Teixeira, J. A., Torres, D., Gonçalves, M. P., Mota, M. V. T., ...

Neste trabalho utilizou-se um sub-produto da indústria cervejeira proveniente do malte com um teor elevado em celulose, a drêche, como suporte de imobilização para tripsina. Efectuaram-se...

Use of two different carriers in a packed bed reactor for endopolygalacturonase production by a yeast strain (2005)

Almeida, Catarina, Brányik, Tomáš, Ferreira, Pedro Moradas, Teixeira, J. A.

A packed bed reactor (PBR) design was tested for the purpose of continuous pectinase production with yeasts, as a possible alternative to the traditional batch process using fungal cultures. Two...

Fluid mechanics and design aspects of a novel oscillatory flow screening mesoreactor (2005)

Reis, N., Harvey, Adam, Mackley, M. R., Vicente, A. A., Teixeira, J. A.

A novel, continuous, oscillatory flow screening mesoreactor, composed of tubes with smooth periodic constrictions, is presented as a new option for small-scale reaction engineering applications,...

Continuous beer fermentation using immobilized yeast cell bioreactor systems (2005)

Brányik, Tomáš, Vicente, A. A., Dostálek, Pavel, Teixeira, J. A.

Traditional beer fermentation and maturation processes use open fermentation and lager tanks. Although these vessels had previously been considered indispensable, during the past decades they were in...

Surface properties of Yarrowia lipolytica and their relevance to γ-decalactone formation from methyl ricinoleate (2005)

Aguedo, Mário, Waché, Yves, Belin, Jean-Marc, Teixeira, J. A.

The surface of the lipid-degrading yeast, Yarrowia lipolytica, was characterized by contact angle and zeta potential (ζ) measurements. The cells were mainly hydrophilic with a negative charge that...

Aspergillus niger β-galactosidase production by yeast in a continuous high cell density reactor (2005)

Continuous primary fermentation of beer : yeast immobilization kinetics and product quality (2005)

The continuous production of extracellular heterologous beta-galactosidase by a recombinant flocculating Saccharomyces cerevisiae, expressing the lacA gene (coding for beta-galactosidase) of...

Brányik, Tomáš, Vicente, A. A., Teixeira, J. A.

A one stage continuous primary beer fermentation consisting of brewing yeast immobilized on spent grain particles in a gas lift reactor was studied. The goal of this work was to adjust the flavor of...

Fermentation performance of a recombinant lactose-consuming flocculating Saccharomyces cerevisiae strain (2005)

Guimarães, P., Klein, Jaroslav, Domingues, Lucília, Teixeira, J. A.

In recent years, there has been a growing interest in bioreactors utilizing immobilized or flocculating cells in continuous process in order to improve the bioprocess productivity. One of possible...

Relationships between hydrodynamics and rheology of flocculating yeast suspensions in a high-cell-density airlift bioreactor (2005)

Klein, Jaroslav, Maia, J. M., Vicente, A. A., Domingues, Lucília, Teixeira, J. A., Juraščík, Martin

In this article a hydrodynamic and rheological analysis of a continuous airlift bioreactor with high-celldensity system is presented. A highly flocculating recombinant strain of Sacharomyces...

Study of ternary glass spherical particle beds : porosity, tortuosity, and permeability (2005)

Dias, Ricardo P., Mota, M., Teixeira, J. A., Yelshin, Alexander

Ternary mixtures of glass beads were constructed as a model of granular packing. Porosity and permeability were experimentally determined in a wide range of mixture composition. Based on experimental...

Modeling of biosurfactant production by Lactobacillus Strains (2005)

Rodrigues, L. R., Moldes, Ana, Teixeira, J. A.

Screening of biosurfactant-producing ability of three Lactobacillus strains was performed, being shown that, for all the tested strains, biosurfactant production is occurring mainly in the first 7...

The effect of the electric field on lag-phase, ethanol and β-galactosidase production of a recombinant S. cerevisiae growing on lactose (2005)

Castro, I., Teixeira, J. A., Vicente, A. A.

The production of ethanol and β-galactosidase from cheese whey and other sub-products from industries can be a good way of minimizing environmental problems and producing valuable products from...

Spent-grains and zeolites as potential carriers for trypsin immobilisation (2005)

Rocha, Cristina, Ducso, L., Gonçalves, M. P., Teixeira, J. A.

Trypsin is a widely used enzyme for protein hydrolysis and can be used to improve functional and nutritional properties of foods. The immobilization of enzymes on solid supports can offer several...

Oxygen influence on the ß-oxidative metabolism of methyl ricinoleate for lactones production by the yeast Yarrowia lipolytica (2005)

Aguedo, Mário, Gomes, Nelma, Waché, Yves, Teixeira, J. A., Belo, Isabel

The yeast Yarrowia lipolytica is able to carry out the peroxisomal β-oxidative catabolism of methyl ricinoleate, a process leading notably to the production of γ-decalactone, a high-value aroma...

Impact of the surface properties of lactic bacteria on the stability of emulsions (2005)

Mai Huong Ly, Waché, Yves, Bouchez-Naïtali, M., Meylheuc, T., Aguedo, Mário, Teixeira, J. A., ...

Bacteria have physicochemical surface properties which depend on the chemical composition of the cell surface. These characters proceed from several type of physicochemical interactions and are...

Application of binary packing for chromatographic separation (2005)

Mota, M., Teixeira, J. A., Yelshin, Alexander, Dias, Ricardo P., Cortez, Susana

Separation of dextran and polyethylene glycol of different molecular mass was performed using a binary packed column of glass beads (size ratio ~ 10) and a binary packed column formed by kieselguhr-G...

On-line monitoring of multi-phase flow in a novel oscillatory screening reactor using fibre optical probes (2005)

Reis, N., Teixeira, J. A., Vicente, A. A.

This paper demonstrates the effectiveness of using fibre optic micro-probes for the measurement of dispersion and mixing in continuous flow within a novel screening reactor operating under...

Baker’s yeast filtration through mixed beds of filtration aids and large glass beads (2005)

Sorption of Cr(III) from aqueous solutions by spent brewery grain (2005)

Filtration of baker´s yeast through a mixed particulate bed of filter aid and glass beads was investigated. Glass beads form the large size particle fraction in the mixture, whereas the small size...

Ferraz, A. I., Tavares, M. T. (Maria Teresa), Teixeira, J. A.

Two types of spent brewery grains were tested for Cr(III) uptake from aqueous solutions: not treated spent grains (NTSG), obtained by abundant washing of spent grain obtained from a Portuguese...

Aging of immobilized brewing yeast in a continuous bubble-column reactor (2005)

Brányik, Tomáš, Lehnert, Radek, Vicente, A. A., Teixeira, J. A.

The aim of this work was to study the physiological changes of immobilized brewing yeast Saccharomyces cerevisiae in a continuous reactor. Continuous cultivation was carried out at three different...

Trypsin immobilisation on zeolites (2005)

Rocha, Cristina, Gonçalves, M. P., Teixeira, J. A.

This work compares different types of zeolites (NaA, NaX and NaY) as potential carriers for trypsin immobilisation. Silica was also used as a traditional carrier. Covalent attachment to the carriers...

Valorization of olive mill wastewater by the yeast Yarrowia lipolytica (2005)

Araujo, Carla, Aguedo, Mário, Gomes, Nelma, Teixeira, J. A., Belo, Isabel

The aim of this work was to study the ability of two different strains of the yeast Yarrowia lipolytica to grow on Olive Mill Wastewater (OMW) and their potential to produce high-value products such...

Continuous beer fermentation with yeast immobilized on alternative cheap carriers and sensorial evaluation of the final product (2005)

Brányik, Tomáš, Silva, Daniel Pereira Da, Vicente, A. A., Teixeira, J. A.

Continuous beer fermentation offers a wide range of advantages, mostly of economic nature over the traditional batch process. However, due to increased complexity of operation comparing to batch...

Sensorial evaluation of continuously fermented beer and the role of process parameters in adjusting its flavour profile (2005)

Brányik, Tomáš, Silva, Daniel Pereira Da, Vicente, A. A., Ferreira, António Augusto, Dostálek, Pavel, ...

Although traditional batch overwhelmingly prevails over continuous fermentation, a breakthrough in quality and savings could be achieved by a simple, flexible and cheap fermentation system. This work...

Continuous primary fermentation of beer : yeast immobilization kinetics and product quality (2005)

Brányik, Tomáš, Vicente, A. A., Teixeira, J. A.

A one stage continuous primary beer fermentation consisting of brewing yeast immobilized on spent grain particles in a gas lift reactor was studied. The goal of this work was to adjust the flavor of...

Novel and simple test plating for screening relative transfructosylation activity of fungi (2005)

Dominguez, Ana, Santos, Isabel M., Teixeira, J. A., Lima, Nelson

Fructooligosaccharides (FOS) have received particular attention recently because of their excellent biological and functional properties, namely, as prebiotic compounds that promote the growth of...

Effect of the particle shape on flow through porous media (2005)

Mota, M., Teixeira, J. A., Yelshin, Alexander, Cortez, Susana

In order to study the performance of shaped particles flow in porous media, filtration of two different shape - spherical and rod-like – micro particles was performed through a porous bed....

Low-cost fermentative medium for biosurfactant production by Streptococcus thermophilus A (2005)

Liquid-liquid equilibrium of aqueous polymer two-phase systems using the modified wilson equation (2005)

Interest in biosurfactants has increased considerably in recent years, as they are potential candidates for many commercial applications in the petroleum, pharmaceuticals, biomedical and food...

Madeira, Pedro, Xin Xu, You-Ting Wu, Teixeira, J. A., Macedo, Eugénia

The modified Wilson equation, developed in a previous publication, for the excess Gibbs energy of aqueous polymer solutions, is extended to multicomponent mixtures. The model provides a flexible...

Prebiotics : from concept to product : the BIOLIFE project (2005)

Torres, D., Dominguez, Ana, Rodrigues, L. R., Rocha, I., Teixeira, J. A., Lima, Nelson, ...

Nutrition has progressed from the discovery of essential nutrients and prevention of dietary deficiency to the promotion of a state of well-being and health and the reduction of the risk of disease....

Biotechnological application of Yarrowia lipolytica for biotransformation in biphasic media (2005)

Gomes, Nelma, Aguedo, Mário, Teixeira, J. A., Belo, Isabel

The yeast Yarrowia lipolytica is able to grow on hydrophobic substrates such as oils, alkanes, fatty acids1. This characteristic notably offers interesting prospects in different industrial areas:...

Aseptic processing of a strawberry pulp in a continuous ohmic heater : numerical simulations and model validation (2005)

Castro, I., Reis, N., Teixeira, J. A., Vicente, A. A.

Continuous food-sterilization processes often involve the flow of liquids or solid-liquid mixtures, frequently highly viscous and with non-Newtonian behaviour, in pipes and reactors. Heat treatment...

Application of a novel oscillatory flow screening micro-reactor to a biotransformation in a two-phase medium (2005)

Vicente, A. A., Reis, N., Gonçalves, Clarisse, Aguedo, Mário, Belo, Isabel, Teixeira, J. A.

Physicochemical surface properties of brewing yeast influencing their immobilization onto spent grains in a continuous reactor (2004)

Brányik, Tomáš, Vicente, A. A., Teixeira, J. A.

Immobilization of brewing yeast onto a cellulosebased carrier obtained from spent grains, a brewing byproduct, by acid/base treatment has been studied in a continuously operating bubble-column...

Study of hydrodynamics and mixing in an airlift reactor with an enlarged separator using magnetic tracer method (2004)

The use of fibre optic probes for flow monitoring within a small-scale tube (2004)

The magnetic tracer technique was used to obtain essential information on hydrodynamics, mixing and reactor design in a multiphase airlift reactor with an enlarged separator. The tracer method...

Reis, N., Vicente, A. A., Teixeira, J. A., Mackley, M. R.

This paper demonstrates the effectiveness of using fibre optic micro-probes for the measurement of dispersion and mixing in continuous flow within small-scale tubes under oscillatory flow conditions....

Biosurfactant from Lactococcus lactis 53 inhibits microbial adhesion on silicone rubber (2004)

Rodrigues, L. R., Mei, Henny Van Der, Teixeira, J. A.

Continuous flocculation airlift bioreactor with high cell loading : hydrodynamic and rheological aspects (2004)

Klein, Jaroslav, Maia, J. M., Juraščík, Martin, Vicente, A. A., Domingues, Lucília, Teixeira, J. A.

European Community programme Improving Human Research Potential.

High cell density reactors for ethanol fermentation (2004)

CFD simulations of RTD of a strawberry pulp in a continuous ohmic heater (2004)

Castro, I., Reis, N., Teixeira, J. A., Vicente, A. A.

A pilot ohmic heater is to be tested for the continuous aseptic processing of strawberry pulps and jams. The hydrodynamics and the fluid residence time distribution (RTD) have been experimentally...

Application of high cell density airlift bioreactors to bio-ethanol production – study on optimal bioreactor operation (2004)

Klein, Jaroslav, Vicente, A. A., Maia, J. M., Domingues, Lucília, Teixeira, J. A.

In this paper a hydrodynamic and rheological analysis of a continuous airlift bioreactor with high cell density system is presented. A highly flocculating recombinant strain of Sacharomyces cerevisae...

Influence of biosurfactants from probiotic bacteria on formation of biofilms on voice prostheses (2004)

Rodrigues, L. R., Mei, Henny Van Der, Teixeira, J. A.

Biofilms were grown on preconditioned voice prostheses with biosurfactants obtained from probiotic bacteria Lactococcus lactis 53 and Streptococcus thermophilus A in an artificial throat model. Both...

Biosurfactant from Lactococcus lactis 53 inhibits microbial adhesion on silicone rubber (2004)

Rodrigues, L. R., Mei, Henny Van Der, Teixeira, J. A.

The ability of biosurfactant obtained from the probiotic bacterium Lactococcus lactis 53 to inhibit adhesion of four bacterial and two yeast strains isolated from explanted voice prostheses to...

The use of enzymes and microorganisms for the production of aroma compounds from lipids (2004)

Aguedo, Mário, Mai Huong Ly, Belo, Isabel, Teixeira, J. A., Belin, Jean-Marc, Waché, Yves

Lipids are an important source of aroma compounds. In foods, lipids are degraded or modified by enzymatic activities that are originally present in the raw materials or that develop later due to the...

Preparation of controlled particulate mixtures with glass beads of different sizes (2004)

Dias, Ricardo P., Teixeira, J. A., Mota, M., Yelshin, Alexander

A method of mixing/preparing binary and ternary mixtures of glass beads was developed using a viscous solution of glycerol in water. After mixing, the mixture was transferred to a prismatic vessel...

Particulate binary mixtures : dependence of packing porosity on particle size ratio (2004)

Dias, Ricardo P., Teixeira, J. A., Mota, M., Yelshin, Alexander

Binary mixtures with significant size ratios are scarcely studied. Yet, contaminants of chromatographic columns or ion-exchange resins have size ratios of delta < 0.1. Binary mixtures of glass beads...

Changes in diffusion through the brain extracellular space (2004)

Mota, M., Teixeira, J. A., Keating, José B., Yelshin, Alexander

ECS (extracellular space) works as the microenvironment of brain cells. Diffusion through ECS may be described through an effective diffusion coefficient, De, which in turn depends on ECS porosity,...

Growth model and metabolic activity of brewing yeast biofilm on the surface of spent grains : a biocatalyst for continuous beer fermentation (2004)

Brányik, Tomáš, Vicente, A. A., Kuncová, Gabriela, Podrazký, Ondřej, Dostálek, Pavel, Teixeira, J. A.

In the continuous systems, such as continuous beer fermentation, immobilized cells are kept inside the bioreactor for long periods of time. Thus an important factor in the design and performance of...

The effect of electric field on important food-processing enzymes : comparison of inactivation kinetics under conventional and ohmic heating (2004)

Castro, I., Macedo, B., Teixeira, J. A., Vicente, A. A.

This work deals with the determination of the inactivation kinetics of several enzymes, most of them used as time-temperature integrators in the food industry. The tested enzymes were...

Ohmic heating of strawberry products : electrical conductivity measurements and ascorbic acid degradation kinetics (2004)

Castro, I., Teixeira, J. A., Salengke, S., Sastry, S. K., Vicente, A. A.

The effects of field strength and multiple thermal treatments on electrical conductivity of strawberry products were investigated. Electrical conductivity increased with temperature for all the...

Production of β-galactosidase from recombinant Saccharomyces cerevisiae grown on lactose (2004)

Domingues, Lucília, Castro, I., Lima, Nelson, Teixeira, J. A.

Improved productivity and costs reduction in fermentation processes may be attained by using flocculating cell cultures. The production of extracellular heterologous β-galactosidase by recombinant...

Cr(III) removal and recovery from Saccharomyces cerevisiae (2004)

Ferraz, A. I., Tavares, M. T. (Maria Teresa), Teixeira, J. A.

Heavy metal recovery from biosorbents is of major importance in the assessment of competitiveness of biosorption processes. Several desorption agents (H2SO4, HNO3, HCl, CH3COOH and EDTA) were tested...

Liquid-liquid equilibrium phase diagrams of new aqueous two-phase systems : Ucon 50-HB5100 + Ammonium Sulfate + water, Ucon 50-HB5100 + Poly(vinyl alcohol) + water, Ucon 50-HB5100 + Hydroxypropyl Starch + water, and Poly(ethylene glycol) 8000 + Poly(vinyl alcohol) + water (2004)

Pereira, Martinha, You-Ting Wu, Madeira, Pedro, Venâncio, Armando, Macedo, Eugénia, Teixeira, J. A.

The phase diagrams of Ucon 50-HB-5100 (Ucon) + ammonium sulfate (NH4)2SO4 + water, Ucon 50-HB- 5100 + poly(vinyl alcohol) 10000 (PVA 10000) + water, Ucon 50-HB-5100 + hydroxypropyl starch (Reppal PES...

Residence times and mixing of a novel continuous oscillatory flow screening reactor (2004)

Reis, N., Vicente, A. A., Teixeira, J. A., Mackley, M. R.

This paper is concernedwith the fluidmechanics andmixing performance of a novel oscillatory flow screening reactor. Using fibre optic probes, a mixing coefficient k_m is determinedfor the system as a...

Continuous primary fermentation of beer with yeast immobilized on spent grains : the effect of operational conditions (2004)

Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.

A one-stage continuous primary beer fermentation with immobilized brewing yeast was studied. The objective of the work was to optimize the operational conditions (aeration and temperature) in terms...

Dependence of Saccharomyces cerevisiae filtration through membrance on yeast concentration (2004)

Effect of real particles packing with large size ratio on porosity and tortuosity of filter bed (2004)

Filtration of baker’s yeast in an isotonic solution through a 0.45 micron membrane was investigated for yeast concentrations in the range 0.14 – 51 g/L at filtration pressures between 40 and 80...

Mota, M., Teixeira, J. A., Dias, Ricardo P., Yelshin, Alexander

The complexity of processes involved in the formation of granular beds results in limited information about permeability κ , which directly rela tes with packing porosity ε and tortuosity T . For a...

Enzymatic hydrolysis of whey protein concentrates : peptide HPLC profiles (2004)

Mota, M. V. T., Oliveira, M. B. P., Rocha, Cristina, Teixeira, J. A., Torres, D., ...

Hydrolysis of whey protein concentrates (WPCs) at different temperatures and pHs, using three enzymes: pepsin, trypsin, and Alcalase®, was monitored during more than 5 hr by reversed phase HPLC/UV,...

Effect of solid particles on flow regimes in bubble columns (2004)

Mena, P. C., Plzáková, M., Ruzicka, M. C., Drahoš, J., Večeř, M., Wichterle, K., ...

Grantová agentura České republiky (GA ČR) - Grant No. 104/04/0827.

The influence of biosurfactants from probiotic bacteria on the formation of voice prosthetic biofilms (2004)

Rodrigues, L. R., Mei, Henny Van Der, Teixeira, J. A.

Biosurfactant from Streptococcus thermophilus A inhibit microbial adhesion on silicone rubber (2004)

Rodrigues, L. R., Mei, Henny Van Der, Teixeira, J. A.

The ability of the biosurfactant obtained from Streptococcus thermophilus A to inhibit adhesion of four bacterial and two yeast strains isolated from explanted voice prostheses to silicone rubber...

Simulações numéricas do processamento asséptico de polpas de morango num aquecedor óhmico contínuo (2004)

Castro, I., Reis, N., Teixeira, J. A., Vicente, A. A.

Neste trabalho efectuaram-se simulações numéricas dos padrões de fluxo num aquecedor óhmico contínuo, em estado estacionário, com recurso ao programa Fluent™. Para tal, criou-se uma grelha...

Residence times and mixing of a novel continuous oscillatory flow meso reactor (2004)

Reis, N., Vicente, A. A., Teixeira, J. A., Mackley, M. R.

A novel meso reactor based on oscillatory flow technology (Harvey et al., 2001) has been recently presented in Harvey et al. (2003) as a new technology for reaction engineering and particle...

Enhanced mass transfer rates of a novel oscillatory flow screening reactor (2004)

Reis, N., Vicente, A. A., Teixeira, J. A., Mackley, M. R.

A novel continuous small-scale reactor based on the oscillatory flow technology (Harvey et al 2001) is being developed for application to specialist chemical manufacture and high throughput...

Hydrodynamic analysis of a continuous airlift bioreactor with flocculating high cell density system (2004)

Klein, Jaroslav, Vicente, A. A., Domingues, Lucília, Juraščík, Martin, Teixeira, J. A.

One of the most common ways to improve the productivity of a fermentation process is the use of high cell density systems. In practice, such a system usually represents a threephase...

Kinetics of brewing yeast accumulation on the surface of spent grains : a biocatalyst for brewing application (2004)

Brányik, Tomáš, Vicente, A. A., Kuncová, Gabriela, Podrazký, Ondřej, Teixeira, J. A.

Effect of solids on flow regime transition in three-phase bubble columns (2004)

Mena, P. C., Rocha, F. A., Teixeira, J. A., Drahoš, J., Ruzicka, M. C.

In bubble column reactors there are two principal flow regimes [1,2,3], the homogeneous (HoR) and the heterogeneous (HeR). These reactors have different behaviour in HoR and HeR, thus the dependences...

Numerical simulations of the hydrodynamic behaviour of a continuous ohmic heater operating with Newtonian and Non-Newtonian fluids (2004)

Castro, I., Reis, N., Teixeira, J. A., Vicente, A. A.

A pilot ohmic heater was tested for the continuous aseptic processing of strawberry pulp. The fluid mechanics and the fluid residence time distribution (RTD), in the whole volume of the vessel and...

Effect of solids on gas-liquid mass transfer in three phase systems (2003)

Mena, P. C., Rocha, F. A., Teixeira, J. A., Pons, M. N.

Continuous production of pectinase by immobilized yeast cells on spent grains (2003)

Almeida, Catarina, Brányik, Tomáš, Teixeira, J. A.

Hydrodynamics of a three-phase airlift reactor with an enlarged separator : application to high cell density systems (2003)

Fluid mixing and particle suspension in a novel microreactor (2003)

The hydrodynamic study of a three-phase airlift reactor with an enlarged head zone was carried out. Effects of gas-solid-liquid separator design and riser to downcomer cross-sectional area using...

Harvey, Adam, Mackley, M. R., Reis, N., Teixeira, J. A., Vicente, A. A.

Comparative analysis of immobilization carriers for a endopolygalacturonase producing yeast strain (2003)

Almeida, Catarina, Brányik, Tomáš, Ferreira, Pedro Moradas, Teixeira, J. A.

The influence of field strength, sugar and solid content on electric conductivity of strawberry products (2003)

Castro, I., Teixeira, J. A., Salengke, S., Sastry, S. K., Vicente, A. A.

The effects of field strength, soluble solids (from 14 to 59.5 ºBrix) and particle size (using two size distributions) on electrical conductivity were investigated. Electrical conductivity increased...

Recovery of the proteose peptone component 3 from cheese whey in Reppal PES 100/polyethylene glycol aqueous two-phase systems (2003)

Rodrigues, L. R., Venâncio, Armando, Teixeira, J. A.

Recovery of the proteose peptone component 3 from cheese whey was optimal using a 16% (w/w) Reppal PES 100 – 24% (w/w) PEG 600 aqueous two-phase system, at pH 7, giving a mass recovery yield of 99%...

Hydrodynamic considerations on optimal design of a three-phase airlift bioreactor with high solids loading (2003)

The enhancement of the cellulolytic activity of cellobiohydrolase I and endoglucanase by the addition of cellulose binding domains derived from trichoderma reesei (2003)

The hydrodynamic study of a three-phase airlift (TPAL) bioreactor with an enlarged gas–liquid dual separator was carried out. Different lengths and diameters of the draft tube were tested to show...

Lemos, M. A., Teixeira, J. A., Domingues, M. R. M., Mota, M., Gama, F. M.

The effect of isolated cellulose binding domains (CBDs) on the hydrolysis of filter paper and microcrystalline cellulose by both cellobiohydrolase I and endoglucanase, was studied. CBDs were obtained...

Interference of coarse and fine particles of different shape in mixed porous beds and filter cakes (2003)

Mota, M., Teixeira, J. A., Bowen, William R., Yelshin, Alexander

In solid–liquid separation the knowledge of solids packing structure is important to control permeability and dewaterability. In particular, cakes formed in filtration are often represented by the...

Continuous production of pectinase by immobilized yeast cells on spent grains (2003)

Almeida, Catarina, Brányik, Tomáš, Ferreira, Pedro Moradas, Teixeira, J. A.

A yeast strain secreting endopolygalacturonase was used in this work to study the possibility of continuous production of this enzyme. It is a feasible and interesting alternative to fungal batch...

Acquisition of flocculation phenotype by Kluyveromyces marxianus when overexpressing GAP1 gene encoding an isoform of glyceraldehyde-3-phosphate dehydrogenase (2003)

Almeida, Catarina, Queirós, Odília, Wheals, Alan, Teixeira, J. A., Ferreira, Pedro Moradas

The use of flocculating yeast strains has been considered as a convenient approach to obtain high cell densities in bioreactors with increasing productivity in continuous operations. In Kluyveromyces...

Aqueous two-phase extraction using thermoseparating polymer : a new system for the separation of endo-polygalacturonase (2003)

Pereira, Martinha, You-Ting Wu, Venâncio, Armando, Teixeira, J. A.

Aqueous two-phase partitioning of endo-polygalacturonase (endo-PG) produced by Kluyveromyces marxianus strains was studied, on systems containing the thermoseparating polymer Ucon 50-HB-5100 (a...

Effect of viscosity on homogeneous–heterogeneous flow regime transition in bubble columns (2003)

Ruzicka, M. C., Drahoš, J., Mena, P. C., Teixeira, J. A.

Experiments were performed in a cylindrical 0.14m diameter bubble column with a metal perforated plate. Air and aqueous solutions of glycerol with viscosity 1–22mPa s were the phases. Gas holdup...

A new modified Wilson equation for the calculation of vapor–liquid equilibrium of aqueous polymer solutions (2003)

Xin Xu, Madeira, Pedro, Teixeira, J. A., Macedo, Eugénia

A local composition model based on the lattice theory and two-fluid theory, considering the excess heat capacity, which is a modified Wilson equation, is developed for the excess Gibbs energy of...

An integrated approach for cheese whey lactose valorisation (2003)

Continuous beer fermentation with yeast immobilized on spent grains : the effect of operational conditions (2003)

The development of any fermentation process requires the integration of life and engineering sciences with the aim of obtaining a high productivity system. The use of immobilized cells is, without...

Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.

Fundação para a Ciência e a Tecnologia (FCT) - SFRH / BPD / 3541 / 2000.

Continuous alcoholic fermentation in high cell density airlift bioreactor using flocculating yeast (2003)

Klein, Jaroslav, Juraščík, Martin, Vicente, A. A., Teixeira, J. A.

European Community (EC) - Improving Human Research Potential - contract number MCFI-2001-01504.

Residence time of tagged magnetic particle in an internal-loop airlift reactor with an enlarged dual separator (2003)

The fluid mechanics relating to a novel oscillatory flow micro reactor (2003)

European Community (EC) - Improving Human Research Potential - Marie Curie Fellowship - contract number MCFI-2001-01504.

Harvey, Adam, Mackley, M. R., Reis, N., Teixeira, J. A., Vicente, A. A.

Fundação para a Ciência e a Tecnologia (FCT) - scholarship SFRH/BD/6954/2001.

Response surface optimization of the medium components for the production of biosurfactant by lactic acid bacteria (2003)

Efeito da adição de compostos iónicos e hidrocolóides na condutividade eléctrica de uma polpa de morango industrial (2002)

Castro, I., Teixeira, J. A., Vicente, A. A.

Expression of a fungal hydrophobin in the Saccharomyces cerevisiae cell wall : effect on cell surface properties and immobilization (2002)

Nakari-Setälä, T., Azeredo, Joana, Henriques, Mariana, Teixeira, J. A., Linder, M., ...

The aim of this work was to modify the cell surface properties of Saccharomyces cerevisiae by expression of the HFBI hydrophobin of the filamentous fungus Trichoderma reesei on the yeast cell...

O ensino de engenharia biológica na Universidade do Minho (2002)

Ferreira, E. C., Teixeira, J. A.

Nos anos 80, a Biotecnologia foi considerada, a nível mundial, como uma das áreas prioritárias de desenvolvimento. Isto levou a que algumas universidades portuguesas começassem a oferecer alguma...

Continuous primary beer fermentation with brewing yeast immobilized on spent grains (2002)

Brányik, Tomáš, Schmidtová, J., Vicente, A. A., Cruz, José Machado, Teixeira, J. A.

Fundação para a Ciência e Technologia (FCT)

The influence of non-Newtonian fluids in the hydrodynamic behaviour of an airlift reactor with an enlarged degassing zone (2002)

Reis, N., Soares, A. A., Oliveira, A. H., Alves, V. D., Vicente, A. A., Teixeira, J. A.

Hydrodynamic considerations in three-phase internal-loop airlift bioreactors : effect of dual separator and draught tube design (2002)

Klein, Jaroslav, Szíjjarto, Andrej, Vicente, A. A., Teixeira, J. A.

Fundação para a Ciência e a Tecnologia (FCT)

Effect of viscosity on homogeneous regime stability in bubble columns (2002)

Mena, P. C., Ruzicka, M. C., Drahoš, J., Teixeira, J. A., Rocha, F. A.

Continuous primary beer fermentation with brewing yeast immobilized on spent grains (2002)

Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.

This work demonstrated the technological feasibility of the three-phase airlift bioreactor (ALR) with brewing yeast immobilized on spent grains (a brewing by-product) for continuous beer production....

Comparative study of Selva and Camarosa strawberries for the commercial market (2002)

Castro, I., Gonçalves, O., Teixeira, J. A., Vicente, A. A.

Selva and Camarosa strawberry varieties were characterized chemically and physically. The importance of keeping the stem until processing, the influence of different transport periods under...

Influence of cell-shape on the cake resistance in dead-end and cross-flow filtrations (2002)

Dextran and fructose separation on an SMB continuous chromatographic unit (2002)

The problems related to tortuosity variation whenever filter cakes are composed of cells with different shapes and compressible biosuspensions are discussed. Presented examples show that neglecting...

Coelho, Mariana S., Azevedo, Diana C. S., Teixeira, J. A., Rodrigues, Alírio

A dextran/fructose mixture was obtained by fermentation of a sucrose rich media using Leuconostoc mesenteroides NRRL B512(f). The dextran and fructose mixture obtained by fermentation as well as a...

Construction of a flocculent Saccharomyces cerevisiae strain secreting high levels of Aspergillus niger β-galactosidase (2002)

Domingues, Lucília, Teixeira, J. A., Penttilä, M., Lima, Nelson

A flocculent Saccharomyces cerevisiae strain secreting Aspergillus niger β-galactosidase activity was constructed by transforming S. cerevisiae NCYC869-A3 strain with plasmid pVK1.1 harboring the A....

Immobilized particles in gel matrix-type porous media : nonhomogeneous cell distribution (2002)

Role of fractional cake composition in cake resistance (2002)

The conventional random pore model assumes a homogeneous cell distribution in the gel matrix used to immobilize cells. However, the validity of this model is restricted to values of the exponent R,...

Yelshin, Alexander, Teixeira, J. A., Bowen, William R., Mota, M.

The binary mixture model was applied in order to provide an explanation of the discrepancy between the calculated and experimentally measured specific cake resistance in TiO2 cakes. The case under...

Interference of coarse particles with fines of different shapes in cake model (2002)

Mota, M., Teixeira, J. A., Yelshin, Alexander, Bowen, William R.

Modelling changes in diffusion through the brain extracellular space (2002)

Mota, M., Teixeira, J. A., Keating, José B., Yelshin, Alexander

Continuous beer fermentation with brewing yeast immobilized on carrier made of spent grains (2002)

Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.

O ficheiro apresenta também a versão portuguesa publicada na página 41 do mesmo documento.

Effect of surfactants on homogeneous regime stability in bubble columns (2002)

Mena, P. C., Ruzicka, M. C., Drahoš, J., Teixeira, J. A., Rocha, F. A.

Grant Agency of the Czech Republic (GA CR) - Grant No. 104/01/0547.

Behaviour of dual gas-liquid separator in an internal-loop airlift reactor : effect of top clearance (2001)

Dolgoš, Ondrej, Klein, Jaroslav, Vicente, A. A., Teixeira, J. A.

EU project Inco-Copernicus

Flocculation bioreactors : engineering based problems (2001)

Vicente, A. A., Teixeira, J. A.

The use of flocculation bioreactors is one of the most interesting ways to provide an increase of the productivity of biotechnological processes. As other high cell density systems, flocculation...

Modelling design of multiphase bubble-bed reactors for advanced food-industry technologies (2001)

Zahradnik, Jindrich, Thomas, N., Ruzicka, M. C., Teixeira, J. A., Markoš, J., Generalis, S.

Project Copernicus

Alcohol production from cheese whey permeate using genetically modified flocculent yeast cells (2001)

Effect of airflow rate on yields of Steinernema carpocapse Az 20 in liquid culture in an external-loop airlift bioreactor (2001)

Alcoholic fermentation of cheese whey permeate was investigated using a recombinant flocculating Saccharomyces cerevisiae, expressing the LAC4 (coding for β-galactosidase) and LAC12 (coding for...

Neves, J. M., Teixeira, J. A., Simões, N., Mota, M.

Maximization of the contact between males and females is a key factor in the production of the nematode Steinernema carpocapsae in a bioreactor. The influence of the airflow rate in male and female...

Partitioning and separation of α-lactalbumin and β-lactoglobulin in polyethylene glycol/ammonium sulphate aqueous two-phase systems (2001)

Rodrigues, L. R., Venâncio, Armando, Teixeira, J. A.

The partition behaviour of α-lactalbumin (αla) and β-lactoglobulin (βlg) on PEG/(NH4)2SO4 system was studied. For purified proteins, a partition coefficient of 12.8 for αla and 0.34 for βlg,...

Spent grains : a new support for brewing yeast immobilisation (2001)

Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.

A novel carrier obtained from spent grains, a brewing by-product, was used for brewing yeast immobilisation in a continuous bubble-column reactor. The multiple-layer cell adhesion to the carrier...

Oxygen mass transfer in a high solids loading three-phase internal-loop airlift reactor (2001)

Immobilized particles in gel matrix-type porous media : homogeneous porous media model (2001)

Determinations of volumetric mass transfer coefficient were conducted in a three-phase internal-loop airlift reactor with an enlarged degassing zone. The effect of parameters such as the airflow rate...

Binary spherical particle mixed beds : porosity and permeability relationship measurement (2001)

Diffusion in pure gels and gels with immobilized cells was analyzed. A model of diffusion assuming a homogeneous cell distribution in gel was improved by introducing a tortuosity value. By...

Mota, M., Teixeira, J. A., Bowen, William R., Yelshin, Alexander

A continuous function relating the porosity of a mixture, ε, and the large particle volume fraction, xD, of binary mixtures of spherical particles has been established. The incorporation of the...

Separation of endo-polygalacturonase using aqueous two-phase partitioning (2001)

You-Ting Wu, Pereira, Martinha, Venâncio, Armando, Teixeira, J. A.

The partitioning of endo-polygalacturonase (endo-PG) in polyethylene glycol (PEG)–polyvinyl alcohol (PVA10 000) and PEG–hydroxypropyl starch (Reppal PES100) aqueous two-phase systems was studied,...

Immobilised particles in gels : homogeneous porous media model (2001)

Oxygen mass transfer in a high solids loading three-phase internal-loop airlift reactor (2001)

A model of diffusion assuming a homogeneous cell distribution in a gel was improved by considering the effect of tortuosity. By theoretical analysis and numerical modeling it was shown that the...

Modelling design of multiphase bubble-bed reactors for advanced food-industry applications (2001)

The way volumetric mass transfer coefficient in a 60 L three-phase internal-loop airlift reactor with an enlarged degassing zone is influenced by the airflowrate (riser superficial gas velocities...

Zahradnik, Jindrich, Ruzicka, M. C., Markoš, J., Teixeira, J. A., Generalis, S., Thomas, N.

An EC project (IC15-CT98-0904 / PL979021) under this title commenced November 1998 courtesy of Dr Jindrich Zahradnik, sadly since deceased. In dedication to his memory overviewed here are...

Hydrodynamic characterisation of an airlift reactor with an enlarged degassing zone, in the presence of non-Newtonian fluids (2001)

Soares, A. A., Oliveira, A. H., Alves, V. D., Vicente, A. A., Teixeira, J. A.

Characterisation of new aqueous two-phase systems using thermoseparating polymers (2001)

Pereira, Martinha, Madeira, Pedro, Wu, You-Ting, Teixeira, J. A., Macedo, Eugénia

Aqueous two-phase systems (ATPS) are increasingly being used for separation of proteins, cells and viruses and some small molecular weight substances since they offer a gentle and friendly...

Production and separation of an endo-polygalacturonase from Kluyveromyces marxianus fermentation (2000)

Pereira, M. A., Wu, You-Ting, Venâncio, Armando, Teixeira, J. A.

Cr (III) recovery from Saccharomyces cerevisiae by elution : a preliminary study (2000)

Ferraz, A. I., Tavares, M. T. (Maria Teresa), Teixeira, J. A.

To recover adsorbed metals from biosorbents, in order to recycle metal and reuse biomass in several adsorption/desorption cycles, elution conditions need to be optimized. The present work aimed to...

Characterization of bubbles in a bubble column by image analysis (2000)

Freitas, Catarina, Amaral, A. L., Fialová, Maria, Ferreira, E. C., Zahradnik, Jindrich, Teixeira, J. A.

Fundação para a Ciência e a Tecnologia (FCT); EC.

Recovery of endo-polygalacturonase using polyethylene glycol-salt aqueous two-phase extraction with polymer recycling (2000)

Wu, You-Ting, Pereira, Martinha, Venâncio, Armando, Teixeira, J. A.

The partitioning behaviour of endo-polygalacturonase (endo-PG) and total protein from a clarified Kluyveromyces marxianus fermentation broth in polyethylene glycol (PEG)-ammonium sulfate and...

Contamination of a high-cell-density continuous bioreactor (2000)

Aplicação de um sistema de análise de imagem à monitorização da fermentação (2000)

Continuous fermentations were carried out with a recombinant flocculent Saccharomyces cerevisiae strain in an airlift bioreactor. Once operating under steady state at a dilution rate of 0.45 h−1,...

Costa, A. M., Vicente, A. A., Amaral, A. L., Ferreira, E. C., Teixeira, J. A., Cruz, José Machado

Incorporação de proteínas lácteas no queijo de vaca (2000)

Couto, A., Lopes, Zulmira, Venâncio, Armando, Teixeira, J. A.

O soro de leite, também conhecido como soro de queijo, é um efluente da produção de queijo gerado em grandes quantidades, estimando-se uma produção diária em Portugal de cerca de um milhão de...

Construction of a flocculent brewer's yeast strain secreting Aspergillus niger β-galactosidase (2000)

Domingues, Lucília, Teixeira, J. A., Lima, Nelson, Penttilä, M.

One way of improving heterologous protein production is to use high cell density systems, one of the most attractive being the flocculating yeast production system. Also, lactose is available in...

Applications of yeast flocculation in biotechnological processes (2000)

Domingues, Lucília, Vicente, A. A., Lima, Nelson, Teixeira, J. A.

A review on the main aspects associated with yeast flocculation and its application in biotechnological processes is presented. This subject is addressed following three main aspects – the basics...

Hydrodynamics of a three-phase external-loop airlift bioreactor (2000)

Fialová, Maria, Zahradnik, Jindrich, Teixeira, J. A.

The effect of the distributing plate orifice diameter, airflow rate, solids loading and solids density on the hydrodynamic characteristics - gas holdup, circulation time and liquid velocity - of a...

A simple method to separate cellulose-binding domains of fungal cellulases after digestion by a protease (2000)

Lemos, M. A., Teixeira, J. A., Mota, M., Gama, F. M.

Core-binding domains of fungal cellulases from Trichoderma reesei were purified using a new and simple technique. Cellulases were hydrolysed with papain and the binding domains were then separated...

Production of dextransucrase, dextran and fructose from sucrose using Leuconostoc mesenteroides NRRL B512(f) (2000)

Santos, Mariana, Teixeira, J. A., Rodrigues, Alírio

The production of dextransucrase, dextran and fructose by sucrose fermentation using Leuconostoc mesenteroides NRRL-B512(F) was studied in batch operation in a bioreactor with total working volume of...

Effect of tortuosity on transport properties of mixed granular beds (2000)

Mota, M., Teixeira, J. A., Bowen, William R., Yelshin, Alexander

The properties of binary mixed beds were investigated in a wide range of the particle size ratio δ . The relationship between tortuosity T, porosity ε, δ , and volume fraction of the large...

Continuous ethanol fermentation of lactose by a recombinant flocculating saccharomyces cerevisiae strain (1999)

Domingues, Lucília, Dantas, Maria M., Lima, Nelson, Teixeira, J. A.

Alcohol fermentation of lactose was investigated using a recombinant flocculating Saccharomyces cerevisiae, expressing the LAC4 (coding for b-galactosidase) and LAC12 (coding for lactose permease)...

Image modeling of mixed granular porous media (1999)

Increase of ethanol productivity in an airlift reactor with a modified draught tube (1999)

Two-dimensional image modeling of binary and ternary mixed porous media was used to study the effect of porosity and tortuosity on effective diffusion coefficient and permeability were separated....

Vicente, A. A., Dluhý, M., Teixeira, J. A.

Static mixers were introduced in the draught tube of a three-phase, concentric tube type airlift bioreactor, resulting in a 30% increase in ethanol productivity during glucose fermentation with a...

Hydrodynamics of a three-phase external-loop airlift bioreactor (1999)

Fialová, Maria, Zahradnik, Jindrich, Teixeira, J. A.

The effect the distributing plate orifice diameter, airflow rate, solids loading and solids density on the hydrodynamic characteristics – gas holdup, circulation time and liquid velocity – of a...

Continuous ethanol production from cheese whey permeate (1999)

Construction of a flocculent saccharomyces cerevisiae fermenting lactose (1999)

Praxis XXI - BD/11306/97.

Domingues, Lucília, Teixeira, J. A., Lima, Nelson

A flocculent Saccharomyces cerevisiae strain with the ability to express both the LAC4 (coding for b-galactosidase) and LAC12 (coding for lactose permease) genes of Kluyveromyces marxianus was...

The use of flocculating brewer's yeast for Cr(III) and Pb(II) removal from residual wastewaters (1999)

Ferraz, A. I., Teixeira, J. A.

The use of inexpensive biosorbents to sequester heavy metals from aqueous solutions, is one of the most promising technologies being developed to remove these toxic contaminants from wastewaters....

Hydrodynamic model for three-phase internal- and external-loop airlift reactors (1999)

Fialová, Maria, Zahradnik, Jindrich, Teixeira, J. A.

A mathematical model predicting the hydrodynamic behaviour of three-phase airlift reactors, working with low-density solids and with high solids loading, was developed. The model allows for the...

Removal efficiency of Cu2+, Cd2+ and Pb2+ by waste brewery biomass : pH and cation association effects (1999)

Marques, Paula Alexandra, Pinheiro, Helena Maria, Teixeira, J. A., Rosa, M. F.

In this work two distinct (flocculent and non-flocculent) yeast wastes from Portuguese breweries were used for the selective removal of Cu2+, Cd2+ and Pb2+ from aqueous solutions. One of the goals...

Image analysis of packed beds of spherical particles of different sizes (1999)

Isolation, screening, and characterisation of flocculating and pectinase producing Kluyveromyces strains (1999)

Two-dimensional simulations of packed beds composed of binary and ternary particle mixtures were made and image analysis of the bed structure was used to determine the bed porosity and tortuosity....

Pereira, Martinha, Schwan, Rosane, Teixeira, J. A.

Eleven strains of Kluyveromyces marxianus were studied to select the best producers of extracellular endo-polygalacturonase (endo-PG), using glucose and lactose as carbon source. Flocculation ability...

Novas metodologias para a fermentação alcoólica do soro de queijo (1999)

Continuous ethanol fermentation of lactose by a recombinant flocculating saccharomyces cerevisiae strain (1998)

Em Portugal, são diariamente lançados no meio ambiente cerca de 1 milhão de litros de soro de queijo – fracção líquida resultante do fabrico de queijo. O impacte ambiental ocasionado por tal...

Domingues, Lucília, Dantas, Maria M., Lima, Nelson, Teixeira, J. A.

Praxis XXI.

Determination of the diffusion coefficients of glucose and oxygen in flocs of saccharomyces cerevisiae (1998)

Vicente, A. A., Dluhý, M., Ferreira, E. C., Mota, M., Teixeira, J. A.

SMB separation of dextran-fructose mixtures produced by Leuconostoc mesenteroides NRRL B512(f) (1998)

Santos, Mariana, Teixeira, J. A., Rodrigues, Alírio

On-line estimation of biomass through pH control analysis in aerobic yeast fermentation systems (1998)

Vicente, A. A., Castrillo, Juan I., Teixeira, J. A., Ugalde, Unai

The amount of acid or base consumed in yeast cultures has been recently assigned to the pathway of nitrogen assimilation under respiratory conditions with no contribution by carbon metabolism...

Solid-phase distribution in an airlift reactor with an enlarged degassing zone (1998)

Mass transfer properties of glucose and O2 in Saccharomyces cerevisiae flocs (1998)

The distribution of the solid-phase in an airlift reactor of the concentric draught tube type, with an enlarged degassing zone, has been determined. Samples were taken at eight points of the reactor...

Vicente, A. A., Dluhý, M., Ferreira, E. C., Mota, M., Teixeira, J. A.

The use of flocculent microorganisms in fermentations is a very promising application. However, it has some drawbacks of which the most important ones are related to mass transfer limitations within...

Modelling diffusion-reaction phenomena in yeast flocs of Saccharomyces cerevisiae (1998)

Vicente, A. A., Dluhý, M., Ferreira, E. C., Teixeira, J. A.

Limitations in the diffusion of substrates into the flocs will condition cell metabolic behaviour, having obvious consequences on growth and product formation. Polymeric additives have been used...

Cutinase purification on poly(ethylene glycol)–hydroxypropyl starch aqueous two-phase systems (1998)

Almeida, M. C., Venâncio, Armando, Teixeira, J. A., Aires-Barros, M. R.

The partition behaviour of cutinase on poly(ethylene glycol) (PEG)–hydroxypropyl starch aqueous two-phase systems was characterized. The effect of molecular mass of PEG, the pH of the system and...

Hydrodynamic studies in an airlift reactor with an enlarged degassing zone (1998)

Effect of liquid-phase surface tension on hydrodynamics of a three-phase airlift reactor with an enlarged degassing zone (1998)

The hydrodynamic behaviour of a 60 l threephase airlift bioreactor, of the concentric draught tube type, with an enlarged degassing zone has been studied. Ca-alginate beads were used as the solid...

Construction of a flocculent brewer’s yeast strain producing an Aspergillus niger β-galactosidase (1998)

The effect of the addition of ethanol (10 g/l) to the liquid-phase on gas and solids holdup, circulation and mixing times and interstitial liquid velocity in a threephase airlift reactor was...

Domingues, Lucília, Teixeira, J. A., Lima, Nelson, Penttilä, M.

Praxis XXI (BD/11306/97).

On-line estimation of biomass through pH control analysis in aerobic yeast fermentation systems (1998)

Vicente, A. A., Castrillo, Juan I., Teixeira, J. A., Ugalde, Unai

Immobilised particles in gel matrix-type porous media : homogeneous porous media model (1998)

Produção de Nemátodos Entomopatogénicos Steinernema spp. em fermentador airlift não convencional : avaliação da eficácia (1998)

Neves, J. M., Teixeira, J. A., Simões, N., Mota, M.

Dextran and fructose production using leuconostoc mesenteroides NRRL.B512(F) with sucrose as substrate (1998)

Santos, Mariana, Teixeira, J. A., Lopretti, Mary, Rodrigues, Alírio

Comparative studies of alcoholic fermentations using flocculent and non-flocculent strains of saccharomyces cerevisiae (1998)

Oliveira, A. C., Rosa, M. F., Teixeira, J. A., Cabral, J. M. S., Aires-Barros, M. R.

Effect of liquid-phase surface tension on hydrodynamics of a three-phase airlift reactor with an enlarged degassing zone (1998)

Trivalent chromium removal using flocculating yeasts : effect of pre-treatments on removal efficiency (1998)

Ferraz, A. I., Teixeira, J. A.

Praxis XXI; Fundação para a Ciência e a Tecnologia (FCT).

Phase contrast microscopy coupled to image analysis as a rapid method to monitor wine flora (1998)

Vieira, J. C., Ferreira, E. C., Teixeira, J. A.

Selection and definition of the operational conditions for the removal of lactose from whey by ion exchange (1998)

Rodrigues, L. R., Venâncio, Armando, Teixeira, J. A.

Tortuosity in bioseparations and its application to food processes (1998)