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See detailInfluence of liquid viscosity on separation efficiency of structured packings – modelling approach based on X-ray tomography investigations
Janzen, Anna; Steube, Julia; Crine, Michel ULg et al

in Proceedings (2014)

The objectives of this work are the investigation of liquid flow morphology inside a structured packing using X-ray tomography and the development of a modelling approach based on hydrodynamic analogy ... [more ▼]

The objectives of this work are the investigation of liquid flow morphology inside a structured packing using X-ray tomography and the development of a modelling approach based on hydrodynamic analogy between the real complex flow patterns and simplified fluid-dynamic elements. To study the influence of viscosity, water and mixtures of water and glycerine with varying glycerine fraction are used as working liquids. X-ray tomography is applied to determine the spatial distribution of liquid in the cross-section of a column filled with MellapakPlus 752.Y packing elements. The resulting images are used to evaluate liquid hold-up, gas-liquid interfacial area and to analyse liquid morphology. Liquid flow patterns (film flow, contact-point liquid, flooded regions) are identified, and the fraction of liquid within each flow pattern depending on flow rate and liquid viscosity is determined. The results of the liquid flow morphology analysis are used to develop a hydrodynamic analogy model. To implement the gas-liquid contact area and the flooded regions into this model, the packing is represented as a bundle of dry, filled and irrigated cylindrical channels, while the ratio between different type channels is determined from the analysis of tomographic images. This simplified hydrodynamic description allows a direct application of rigorous partial differential transport equations, and their solution yields local concentration fields which are used for the evaluation of the separation efficiency. The new modelling approach is validated by comparison with separation efficiency data obtained from experiments with CO2 desorption from saturated water-glycerine mixtures into air. The presented modelling approach is capable of predicting the influence of viscosity on separation efficiency of columns filled with structured packings. [less ▲]

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See detailThe influence of lithology on the mechanical strength and porosity of terra-cotta, the case study of Marrakech region (Morocco).
El Boudour El Idrissi, Hicham ULg; Daoudi, Lahcen; Collin, Frédéric ULg et al

Poster (2015, May 19)

The ceramic pastes in Marrakech region are prepared on the base of six types of raw materials of different lithologies. Various products are manufactured. The production consists of cooking utensils ... [more ▼]

The ceramic pastes in Marrakech region are prepared on the base of six types of raw materials of different lithologies. Various products are manufactured. The production consists of cooking utensils (based on schist, colluviums, quartzose sand and silt), decoration products (based on argillite, washing residues and soil), vases and gourds products (based on schist and soil), tiles (based on silt decantation) and traditional dishes (based on soil and argillite). In this study we elaborate bricks from the different raw material and we evaluate some of their physical properties after firing at 1050°C. In particular we measure the porosity to water and the mechanical strength of all the fired bricks. The aim is to compare the final product quality according to the origin (lithology) of the clayey raw material of the ceramic pastes. Based on our experiments, the bricks of the lower compressive strength (CS) and of the lower flexural strength (FS) are those based on sand (CS = 39 MPa; FS = 7 MPa), on silt decantation (CS = 25 to 39 MPa; FS = 10 to 18 MPa), and on schist and colluviums (CS = 20 to 51 MPa; FS = 6 to 17 MPa). Those of the highest values are based on argillites (CS = 33 to 102 MPa; FS = 13 to 28 MPa). The other pastes are characterized by intermediate values. The porosity ranges between 5 to 27%. The bricks based on silt decantation have the greatest values (20 to 27%), whereas those based on argillite have the lower values (5 to 10%). Those physical properties are, in most cases, in agreement with the requested values of the bricks industry. We conclude that such raw materials have high perspective to manufacture structural products of high performance in mechanical strength and thermal insulation. [less ▲]

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See detailINFLUENCE OF LOCAL BUCKLING ON THE SHEAR RESISTANCE OF BOLTED CONNECTIONS FOR TUBULAR RACKING STRUCTURES
D'Antimo, Marina ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg et al

in THE INTERNATIONAL COLLOQUIUM ON STABILITY AND DUCTILITY OF STEEL STRUCTURES, Timisoara 30 May-01 June 2016 (2016, May)

The competition in the field of storage racking structures is so that companies are always look-ing for new structural solutions aiming at containing construction time and expenses. This pa-per focuses ... [more ▼]

The competition in the field of storage racking structures is so that companies are always look-ing for new structural solutions aiming at containing construction time and expenses. This pa-per focuses the bearing failure of shear joint using long bolts through thin tubular members with the purpose to check the reliability of Eurocode 3 formulation. The used hollow sections are free to buckle inward leading to a bearing resistance lower than the one predicted using EC3. In fact EC3 does not account for the possible occurrence of out-of-plane deformations in shear connection assuming that the connected plates are restrained by the bolt head and the nut. In order to investigate this phenomenon, an experimental campaign has been developed, a FE model Abaqus/CAE has been validated and a parametric study has been performed. The present paper introduces the conducted investigations. [less ▲]

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See detailInfluence of low-dose aprotinin on the inflammatory reaction due to cardiopulmonary bypass in children
Seghaye, Marie-Christine ULg; Duchateau, J.; Grabitz, R. G. et al

in Annals of Thoracic Surgery (1996), 61(4), 1205-1211

Background. The serine protease inhibitor aprotinin inhibits trypsin, kallikrein, and plasmin and enhances the complement hemolytic activity of the first complement component C1. We tested whether low ... [more ▼]

Background. The serine protease inhibitor aprotinin inhibits trypsin, kallikrein, and plasmin and enhances the complement hemolytic activity of the first complement component C1. We tested whether low-dose aprotinin influences the inflammatory reaction related to cardiopulmonary bypass. Methods. In an open, randomized study, 25 children undergoing cardiac operations were investigated prospectively. The treated group comprised 11 patients receiving low-dose aprotinin (20,000 kIU/kg [2.8 mg/kg]), and the control group included 14 patients. Complement activation, cytokine production, and leukocyte stimulation were analyzed before, during, and after cardiopulmonary bypass. Results. In all children, significant C3 conversion and C5a generation, interleukin-6 synthesis, and myeloperoxidase, eosinophil cationic protein, and histamine liberation occurred in relation to cardiopulmonary bypass. This was not influenced by aprotinin treatment. In contrast, neutrophil kinetic studies at the end of cardiopulmonary bypass showed a significantly lower increase in the aprotinin as compared with the control group. Conclusions. Our results suggest that low-dose aprotinin has little influence on the inflammatory reaction induced by cardiopulmonary bypass. Aprotinin affects neutrophil mobilization but not white blood cell degranulation related to cardiopulmonary bypass, and has no influence on complement activation and interleukin-6 synthesis. [less ▲]

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See detailInfluence of magnet size on magnetically engineered field-induced superconductivity
Gillijns, W.; Milosevic, M. V.; Silhanek, Alejandro ULg et al

in Physical Review. B : Condensed Matter (2007), 76(18),

We investigate experimentally and theoretically the superconducting properties of an Al thin film covering a periodic array of Co/Pt magnetic disks with out-of-plane magnetization for different radii of ... [more ▼]

We investigate experimentally and theoretically the superconducting properties of an Al thin film covering a periodic array of Co/Pt magnetic disks with out-of-plane magnetization for different radii of the magnetic disks and constant period of the magnetic lattice. The presence of the arrays of magnetic dots leads to a quantized displacement of the normal/superconducting phase boundary along the magnetic field axis, with each step corresponding to a flux-quantum per unit cell of the magnetic lattice. We demonstrate that this so-called field-induced superconductivity is strongly dependent not only on the chosen magnetic material and its magnetization M but also on the radius R of the constructed magnetic disks. Since field-induced superconductivity is directly linked to the nucleation of vortex-antivortex (V-AV) pairs, a theoretical M-R equilibrium phase boundary is presented, delimiting regions of different numbers of induced V-AV pairs per magnet. A good qualitative and quantitative agreement is found between theory and experiment. [less ▲]

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See detailInfluence of magnetic fields on structural martensitic transitions
Yang, X *-D; Riseborough, P. S.; Modic, K. A. et al

in Philosophical Magazine (2009), 89(22-24), 2083-2091

We show evidence that a structural martensitic transition is related to significant changes in the electronic structure, as revealed in thermodynamic measurements made in high magnetic fields. The effect ... [more ▼]

We show evidence that a structural martensitic transition is related to significant changes in the electronic structure, as revealed in thermodynamic measurements made in high magnetic fields. The effect of the magnetic field is considered unusual as many influential investigations of martensitic transitions have emphasized that the structural transitions are primarily lattice dynamical and are driven by the entropy due to the phonons. We provide a theoretical framework, which can be used to describe the effect of the magnetic field on the lattice dynamics in which the field dependence originates from the dielectric constant. [less ▲]

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See detailInfluence of marrow erythropoietic activity on serum erythropoietin levels after autologous hematopoietic stem cell transplantation.
Beguin, Yves ULg; Baron, Frédéric ULg; Fillet, Georges ULg

in Haematologica (1998), 83(12), 1076-81

BACKGROUND AND OBJECTIVE: Serum erythropoietin (sEpo) concentration depends primarily on the rate of renal production in response to hypoxia. However, sEpo levels increase inappropriately after ... [more ▼]

BACKGROUND AND OBJECTIVE: Serum erythropoietin (sEpo) concentration depends primarily on the rate of renal production in response to hypoxia. However, sEpo levels increase inappropriately after conditioning for autologous stem cell transplantation (ASCT) before progressively returning to adequate levels. We investigated the possible influence of erythropoietic activity on these observations. DESIGN AND METHODS: Forty patients undergoing an ASCT, 8 with bone marrow (BMT) and 32 with peripheral blood stem cells (PBSC), were separated into 3 groups. Group 1 was formed of the 8 BMT patients (median time to 1% reticulocytes: 39 days), group 2 of 16 PBSC patients with relatively slow erythroid engraftment (> or = 15 days to 1% reticulocytes, median 19 days) and group 3 of 16 PBSC patients with prompt erythroid recovery (< 15 days to 1% reticulocytes, median 13 days). Marrow erythroid activity was assessed by serum transferrin receptor levels (sTfR). Serum Epo (sEpo) levels were expressed in relation to the degree of anemia as observed/predicted (O/P) ratios of (O/P) log (sEpo). RESULTS: Serum sTfR levels decreased by more than 50% in all 3 groups after conditioning, reaching their nadir on day 7. Nadir values doubled by day 28 in group 3, day 60 in group 2, but not within 100 days in group 1. O/P sEpo ratios increased inappropriately in all 3 groups after conditioning but then declined at very differing speeds in the 3 groups. In group 1, ratios remained above 1.10 through to day 28 and above 1.00 through to day 42, before leveling off at around 1.00 thereafter. In group 2, ratios remained above 1.00 through to day 14, than decreased to a minimum of 0.89 by day 42 before returning to 1.00 by day 100. In group 3, ratios decreased to 0.84 by day 21 and remained below 0.90 thereafter. INTERPRETATION AND CONCLUSIONS: We conclude that sEpo levels are not only influenced by tissue oxygenation but also depend on the mass of erythroid precursors in the bone marrow. This may be the main explanation for the observed changes in sEpo levels during ASCT. [less ▲]

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See detailThe influence of mechanical parameters on tissue differentiation and bone formation around immediately loaded implants in the bone chamber model
Vandamme, Katleen; Duyck, Joke; Geris, Liesbet ULg et al

in Proceedings of the first thematic workshop of the European Society of Biomechanics on Mechanobiology of Cells and Tissue Engineering (2005)

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See detailThe influence of mechanical parameters on tissue differentiation and bone formation around immediately loaded implants in the bone chamber model
Vandamme, Katleen; Duyck, Joke; Geris, Liesbet ULg et al

in Computer Methods in Biomechanics & Biomedical Engineering (2005, September), 8(4), 275-276

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See detailInfluence of medium composition on oxygen transfer rate in animal cell culture
Toye, Dominique ULg; Galifi, A.; Salmon, Thierry ULg et al

in Canadian Journal of Chemical Engineering (2010), 88(4), 671-676

Experiments were conducted in a 0.25m diameter bubble column to investigate the effect of medium composition on oxygen transfer rate. Aqueous solutions, the composition of which mimics a mammalian cell ... [more ▼]

Experiments were conducted in a 0.25m diameter bubble column to investigate the effect of medium composition on oxygen transfer rate. Aqueous solutions, the composition of which mimics a mammalian cell culture medium, are used. The effect on oxygen transfer rate of additives used to protect cells against local hydrodynamic stresses induced by bubble coalescence and bursting is addressed, in the range of operating conditions (aeration rates) met in animal cell cultures. The mass transfer coefficient, the liquid viscosity and surface tension, and the bubble size distribution are measured as a function of liquid composition and of gas superficial velocity, allowing to decouple the effects of the different additive on kL and on a. [less ▲]

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See detailInfluence of medium composition on oxygen transfer rate in animal cell culture
Toye, Dominique ULg; Galifi, Alain; Salmon, Thierry ULg et al

in Proceedings of 8th World Congress on Chemical Engineering (2009)

Experiments were conducted in a 0.25 m diameter bubble column to investigate the effect of animal cell culture medium composition on oxygen transfer rate. Air is used as the dispersed phase. The gas ... [more ▼]

Experiments were conducted in a 0.25 m diameter bubble column to investigate the effect of animal cell culture medium composition on oxygen transfer rate. Air is used as the dispersed phase. The gas superficial velocity is varied between 0.4 and 2 cm/s (aeration rate ranging between 0.05 and 0.25 vvm) and the bubble column is thus operated in the homogenous regime. Aqueous solutions the composition (electrolyte, protein concentrations) of which mimics a mammalian cell culture medium) are used as the continuous phase. In particular, the effect on oxygen transfer rate of additive such as PVP, Pluronic F-68 which are usually used to protect cells against local hydrodynamic stresses induced by bubble coalescence and bursting is addressed. For each composition, the mass transfer coefficient is measured by the "gas in – gas out" method using a fast response dissolved oxygen probe. Its increase with gas velocity is measured. The liquid viscosity and surface tension are experimentally determined as a function of culture medium composition. Bubble size distribution is measured at different scales using three experimental techniques: gas disengagement technique, two dual optical probes and photography, which lead to results in good qualitative agreement one with each other. The integrated analysis of these data allows to decouple the effects of the different additive on coefficient kL and on the interfacial area, a. [less ▲]

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See detailInfluence of melodic context on the perception of vocal pitch accuracy
Beeken, Manon; Morsomme, Dominique ULg; Larrouy, Pauline ULg

Poster (2014, May 27)

In order to categorize sung performances as “in tune” or “out of tune”, one can measure the deviation between the performance and the musical notation. Depending on the study, a deviation of a semitone ... [more ▼]

In order to categorize sung performances as “in tune” or “out of tune”, one can measure the deviation between the performance and the musical notation. Depending on the study, a deviation of a semitone (100 cents) or a quartertone (50 cents) is considered as “out of tune”. However, these values are arbitrary and the current study aims to define perceptual thresholds of pitch accuracy in a melodic context. For this purpose, melodic sequences were manipulated, from “in tune” (deviation of 0 cent) to “out of tune” (10 to 80 cents, in 10 cents steps). In a 2x2x2 design we systematically varied the conditions of: melodies (ascending/descending target-interval), type of errors (interval or tonality deviation), and direction of the deviation (enlargement or compression). The sequences were presented to 30 non-musicians using the method of limits procedure, in a test/retest paradigm. For each condition, they were asked to specify whether the presented singing performances were “in tune” or “out of tune”. The results showed that participants were consistent in their evaluation between the test and the retest. The pitch accuracy threshold (M = 29 cents, ES = .75) was not influenced by the melody, the type of errors, and the direction of the deviation. This study highlights the ability of non-musicians to perceive small pitch deviations (less than a quartertone) in a melodic context. This finding elucidates on the concept of pitch accuracy and therefore yields the opportunity to revise objective tools for the evaluation of singer pitch accuracy. [less ▲]

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See detailInfluence of Melting and Rheological Properties of Fatty Binders on the Melt Granulation Process in a High-Shear Mixer
Evrard, Brigitte ULg; Amighi, K.; Beten, D. et al

in Drug Development & Industrial Pharmacy (1999), 25(11), 1177-84

The preparation of granules by melt granulation was investigated using a laboratory-scale high-shear mixer (Pellmix PL 1/8) and binary mixtures containing lactose and different lipidic binders, namely ... [more ▼]

The preparation of granules by melt granulation was investigated using a laboratory-scale high-shear mixer (Pellmix PL 1/8) and binary mixtures containing lactose and different lipidic binders, namely, Compritol 888, Cutina HR, or Precirol ATO5. [less ▲]

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See detailInfluence of membrane-bound tumor necrosis factor (TNF)-alpha on obesity and glucose metabolism
Vörös, Gabor; Maquoi, Erik ULg; Collen, Désiré et al

in Journal of Thrombosis and Haemostasis [=JTH] (2004), 2(3), 507-513

OBJECTIVES: To investigate the influence of transmembrane tumor necrosis factor (TNF)-alpha on adipose tissue development and insulin-mediated glucose metabolism. METHODS AND RESULTS: TNF-alpha and ... [more ▼]

OBJECTIVES: To investigate the influence of transmembrane tumor necrosis factor (TNF)-alpha on adipose tissue development and insulin-mediated glucose metabolism. METHODS AND RESULTS: TNF-alpha and lymphotoxin-alpha-deficient mice expressing non-cleavable transmembrane TNF-alpha (Tg-tmTNF-alpha) and TNF-alpha/lymphotoxin-alpha double knockout (control) mice were kept on high-fat diet for 15 weeks. The food intake and feeding efficiency of Tg-tmTNF-alpha mice were significantly higher compared with control mice. At the end of the study, Tg-tmTNF-alpha mice had a significantly higher total body weight, as well as subcutaneous and gonadal adipose tissue mass. Histological analysis revealed that the expression of Tg-tmTNF-alpha resulted in a significantly increased adipocyte area and blood vessel density. Plasma leptin levels correlated positively with adipose tissue mass. The plasma levels of total cholesterol and HDL-cholesterol were significantly increased and LDL-cholesterol levels significantly decreased in Tg-tmTNF-alpha mice. Fasting blood glucose and plasma insulin levels were not different between the two genotypes and intraperitoneal glucose and insulin tolerance tests did not show significant differences. CONCLUSIONS: Transmembrane TNF-alpha enhances adipose tissue formation without altering insulin-mediated glucose metabolism in mice with nutritionally induced obesity. [less ▲]

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See detailInfluence of mesoporosity in hematite films on water splitting efficiency
Toussaint, Caroline ULg; Cloots, Rudi ULg; Henrist, Catherine ULg

Poster (2014)

Solar energy is inexhaustible but variable during the day and the seasons. Photoelectrolysis of water (water splitting) convert this energy into hydrogen to obtain an energy that can be stored and ... [more ▼]

Solar energy is inexhaustible but variable during the day and the seasons. Photoelectrolysis of water (water splitting) convert this energy into hydrogen to obtain an energy that can be stored and transported on demand. Hematite is a promising material for the photoanode in water splitting because of its high stability in water, cheapness, abundance and its band gap that enables the absorption of visible light (Eg: 2,1eV). Nevertheless, hematite has also some drawbacks including a short diffusion length of holes and a bad electronic conductivity. We have implemented spin coating and templating to produce doped mesoporous hematite films. The nanostructuration can improve the performances in water splitting by reducing the diffusion length of holes and increasing the specific surface between the film and the electrolyte. To suppress the collapse of the mesoporosity at high temperature (requested for dopant activation), we have used a temporary silica confinement scaffold that reduces the crystallite growth. To show the impact of the nanostructure, we have compared three films (mesoporous, collapsed and dense) in terms of hematite content (elemental analysis), nanostructure (electron microscopy), crystallinity (X-ray diffraction) and water splitting efficiency. We have also test two thermal treatments. This study highlights the effect of the effective interface with the electrolyte, through the preservation or not of open porosity and the different evolutions of the nanostructures as a function of the heat treatment. [less ▲]

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See detailInfluence of methanol on the enantioresolution of antihistamines with carboxymethyl-beta-cyclodextrin in capillary electrophoresis
Van Eeckhaut, A.; Detaevernier, M. R.; Crommen, Jacques ULg et al

in Electrophoresis (2004), 25(16), 2838-2847

According to the model of Wren and Rowe, the separation between two enantiomers in capillary electrophoresis (CE) decreases if an organic modifier is added to the run buffer containing a neutral ... [more ▼]

According to the model of Wren and Rowe, the separation between two enantiomers in capillary electrophoresis (CE) decreases if an organic modifier is added to the run buffer containing a neutral cyclodextrin (CD) in a concentration below its optimal value in a solvent-free system. In previous work, however, it was observed that the addition of methanol to the background electrolyte (BGE) containing not charged carboxymethyl-beta-CD in a concentration below its optimal value, increased the enantioresolution of dimetindene maleate. The enantioresolution decreased when other organic modifiers (ethanol, isopropanol or acetonitrile) were added and/or when other neutral (beta-CD, hydroxypropyl-beta-CD) or chargeable (carboxyethyl-beta- and succinyl-beta-CD) CDs were used. In this CE study further attempts are made to elucidate the observed phenomena through investigating other basic drugs. The effect of organic modifier and CD concentration on the enantioseparation was studied by means of central composite designs. It is shown that obtaining this increase in enantioresolution depends upon the type of CD, the type of organic modifier, and the structure of the analytes. It was also observed that small differences in the structure of the analytes or the CD could have an influence on the enantioresolution. The addition of methanol also resulted in different effects on the resolution of closely related analytes. [less ▲]

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See detailInfluence of methanol/sorbitol co-feeding rate on pAOX1 induction in a Pichia pastoris Mut+ strain in bioreactor with limited oxygen transfer rate.
Carly, F.; Niu, H.; Delvigne, Frank ULg et al

in Journal of industrial microbiology & biotechnology (2016), 43(4), 517-23

High Pichia pastoris biomass density could be obtained using high co-feeding rate of methanol and sorbitol in a fed-batch or continuous culture, while further higher feeding rate finally leads to oxygen ... [more ▼]

High Pichia pastoris biomass density could be obtained using high co-feeding rate of methanol and sorbitol in a fed-batch or continuous culture, while further higher feeding rate finally leads to oxygen limitation in bioreactor. In the literature, there is lack of report about AOX1 promoter regulation with regard to dissolved oxygen level (DO). Therefore, in this work, chemostat cultures were performed to investigate the cell growth, metabolism and regulation of the AOX1 promoter (pAOX1) regarding co-feeding rate of optimized methanol/sorbitol mixture (methanol fraction 0.60 C-mol/C-mol) using a P. pastoris Mut+/pAOX1-lacZ strain. The oxygen transfer rates (OTR) in bioreactor were kept in the range of typical values of large bioreactor, i.e., 4-8 g/(L h) if DO equals 30 % saturation or 5-10 g/(L h) if DO nears zero. For DO >0, an increase of the carbon fed led to an increase of pAOX1 induction. By contrast, when dissolved oxygen was completely depleted, methanol accumulated, causing a 30 % decrease of pAOX1 induction. However, this decrease is more likely to be lined to methanol accumulation than to low level of dissolved oxygen (<4 % DO). Methanol/sorbitol co-feeding allowed cells to adapt to oxygen transient limitations that often occur at industrial scale with reduced effect on pAOX1 induction. The optimal feeding rate tested here was 6.6 mmol C (DCW h)(-1) at an OTR of 8.28 g O2(L h)(-1) with over fivefold pAOX1 induction (probably directly associated with target protein productivity) compared with previous work. [less ▲]

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See detailInfluence of methyl-b-cyclodextrin on the relase kinetics of inulin encapsulated in bioadhesive liposomes
Piel, Géraldine ULg; Boulmedarat, Laila; Bochot, Amélie et al

Poster (2004, May)

Detailed reference viewed: 14 (0 ULg)