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See detailInfluence of DMM addition in light fuel oil on the flame emission in a domestic hot water boiler
Masy, Cédric; Ngendakumana, Philippe ULg

Conference (2004, August)

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler whose ... [more ▼]

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler whose burner is equipped with a spill-return atomizer. The tests have been performed in steady state regime without and with addition of DMM. During all the tests, the oxygen at the chimney was kept constant (around 3%) by adjusting the position of the burner air damper and thus the air combustion mass flow rate. The combustion chamber has two quartz windows through which the flame emission was registered by using a photodiode sensible in visible range. Classical gas analysers were used to measure the CO and NOx concentrations at the chimney. DMM percentages up to 15% (by mass) have been tested. [less ▲]

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See detailInfluence of DNA condensation state on transfection efficiency in DNA/polymer complexes: An AFM and DLS comparative study
Volcke, C.; Pirotton, S.; Grandfils, Christian ULg et al

in Journal of Biotechnology (2006), 125(1), 11-21

Atomic force microscopy (AFM) is used to describe the formation process of polymer/DNA complexes. Two main objectives of this research are presented. The first one is to apply AFM as an effective tool to ... [more ▼]

Atomic force microscopy (AFM) is used to describe the formation process of polymer/DNA complexes. Two main objectives of this research are presented. The first one is to apply AFM as an effective tool to analyse DNA molecules and different polycation/DNA complexes in order to evaluate their degree of condensation (size and shape). The other one is to search for a relationship between the condensation state of DNA and its transfection efficiency. In this study, linear methacrylate based polymers and globular SuperFect polymers are used in order to induce DNA condensation. Ternary complexes, composed of methacrylate based polymers and polyethylene glycol (PEG)-based copolymers, are also investigated. AFM allows us to confirm good condensation conditions and relate them (or not) to transfection efficiencies. These AFM results (obtained after drying in air) are compared with measurements deduced from Dynamic Light Scattering (DLS) experiments performed in water. This comparison allowed us to identify the structural modifications resulting from deposition on the mica surface. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailInfluence of domestication process on immune response to repeated emersion stressors in Eurasian perch (Perca fluviatilis L.)
Douxfils, Jessica; Lambert, S; Mathieu, Cédric et al

in Comparative Biochemistry and Physiology. A : Comparative Physiology (2014), 173

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See detailInfluence of dominance relationships on the estimation of dominance variance with sire-dam subclass effects
Gengler, Nicolas ULg; VanVleck, L. D.; MacNeil, M. D. et al

in Journal of Animal Science (1997), 75(11), 2885-2891

Two data sets from the USDA Livestock and Range Research Laboratory mere analyzed to study dominance variance and the influence of dominance relationships. The first consisted of 4,155 birth weight (3,884 ... [more ▼]

Two data sets from the USDA Livestock and Range Research Laboratory mere analyzed to study dominance variance and the influence of dominance relationships. The first consisted of 4,155 birth weight (3,884 weaning weight) records of inbred USDA Line 1 Herefords. The second consisted of 8,065 birth weight (7,380 weaning weight) records from a line-cross experiment with five lines. Two models were used. Both included fixed effects of year-sex of calf and age of dam, and covariates for calving date, inbreeding of animal, and inbreeding of dam. For the second set, additional covariates were line composition and heterozygosity coefficients. Random effects were direct and maternal additive genetic, maternal permanent environment, sire-dam subclass, and residual. Model 1 considered sire-dam subclasses unrelated. Model 2 related sire-dam subclasses with a parental dominance relationship matrix. Variance components were estimated using REML. Differences between estimates with Model 1 and 2 were unimportant except for dominance variance. For the first data set, estimates with Model 2 of relative genetic direct and maternal variances, direct-maternal correlation, permanent environment, and dominance variances for birth weight were .35, .13, -.02, .03, and .25, respectively, and they were .39, .11, .04, .06 and .14 for the second data set. For weaning weight, the first data set estimates were .20, .15, -.37, .19, and .11, respectively, and they were .16, .20, -.07, .18, and .18 for the second data set. Changes, decreases and increases, in estimates of dominance variances may be due to increased information from relationships and family types other than full-sibs. The assumption of unrelated sire-dam subclasses might not be appropriate for estimation of dominance variance in populations with many dominance relationships among siredam classes. [less ▲]

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See detailInfluence of dose on the persistence of conditioned place preference induced by cocaine in C57BL/6J mice
Brabant, Christian ULg; Tirelli, Ezio ULg

in Behavioural Pharmacology (2003, September), 14(Suppl. 1), 54

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See detailInfluence of drospirenone on renin-angiotensin-aldosterone system evaluation
VROONEN, Laurent ULg; Cavalier, Etienne ULg; Vranken, Laura ULg et al

in Endocrine Abstracts - 13th European Congress of Endocrinology (2011)

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See detailInfluence of drying and hydrothermal treatment of corn on the denaturation of salt-soluble proteins and color parameters
Odjo, Sylvanus; Malumba Kamba, Paul ULg; Dossou, Joseph et al

in Journal of Food Engineering (2012), 109(3), 561-570

The effect of heat treatments (drying and hydrothermal treatment) on the extractability of salt-soluble protein (SSP) was assessed using Promatest methodology for corn kernels heated between 60 C and 120 ... [more ▼]

The effect of heat treatments (drying and hydrothermal treatment) on the extractability of salt-soluble protein (SSP) was assessed using Promatest methodology for corn kernels heated between 60 C and 120 C. During drying, the evolution of the grain moisture content is fitted using the analytical solution of Fick equation developed by Crank (1979) for spherical material. The decrease of extractible salt-soluble protein during heating is forecasted using a first and a second order ordinary differential equation. It was found that temperature; moisture content and time of processing greatly influence the kinetic denaturation of SSP of corn kernels. The evolution of extractible SSP content of corn kernels during drying at high temperature is more correctly described with second order kinetic than with the first order kinetic reaction. The Hunterlab color parameters of corn also vary during drying. Lightness and color intensity decrease while yellowness, redness, chroma and hue angle increase through drying time. Most of these Hunterlab color parameters are highly correlated with the salt-soluble proteins content and therefore could be used as indicators of excessive heat treatment and denaturation of salt-soluble proteins in corn kernels [less ▲]

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See detailInfluence of drying and hydrothermal treatments on the denaturation of corn proteins
Odjo, Djosse Psijus Sylvanus ULg; Malumba Kamba, Paul ULg; Bera, François ULg

Poster (2013, February 08)

Corn (Zea mays L.) is the most abundant cereal grain produced in the world. It also provides a significant amount of protein in human and animal diets. During drying corn grains undergo several ... [more ▼]

Corn (Zea mays L.) is the most abundant cereal grain produced in the world. It also provides a significant amount of protein in human and animal diets. During drying corn grains undergo several alterations including protein denaturation. A series of studies have been conducted in order to understand mechanisms behind denaturation of corn proteins during drying and heat moisture treatments. Using a laboratory fluidized-bed dryer, a flint corn variety have been dried between 54° and 130°C and subjected to different analyses from a qualitative point of view with a sequential extraction of corn protein fractions and from a quantitative point of view with the modeling of salt-soluble proteins using Promatest assay. Albumin, globulin and zein solubilities dropped significantly when the drying temperature increased. The electrophoretic patterns of zein and glutelin-G1 were not significantly modified, although the solubility of zein was affected by the drying temperature. The analysis of the different protein group solubilities suggested that denaturation mechanisms other than the creation of new disulfide bonds occurred during the drying of corn at high temperature. The study of the effect of heat treatments on the extractability of salt-soluble proteins shows that temperature; moisture content and time of processing greatly influence their kinetic denaturation. Modeling of salt-soluble proteins reveals that the evolution of extractible salt-soluble proteins content of corn kernels during drying at high temperature is more correctly described with a second order kinetic reaction. Investigations continue in order to understand protein denaturation and influence in functional properties and end-use of corn protein-based products. [less ▲]

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See detailInfluence of drying methods on yield and chemical composition
Dahak, K.; Wathelet, Jean-Paul ULg; Chechouani, H. et al

Poster (2009)

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See detailInfluence of drying temperature on functional properties of wet-milled starch granules
Malumba Kamba, Paul ULg; Massaux, Carine; Deroanne, Claude et al

in Carbohydrate Polymers (2009), 75

Relationships between swelling capacities, pasting properties, rotational flow behaviour and textural properties of hydro-thermally heated wet-milled starch granules from corn dried between 60 and 130°C ... [more ▼]

Relationships between swelling capacities, pasting properties, rotational flow behaviour and textural properties of hydro-thermally heated wet-milled starch granules from corn dried between 60 and 130°C were investigated. High-drying temperatures applied during the corn drying process conferred to the wet-milled starch granules (WSG) such a rigidity which reduced their swelling capacities, their water binding capacities and their water solubility index after gelatinization. These granules changes affected their pasting characteristics, their flow behaviour and several textural parameters of gel formed from the wet-milled starch granule after gelatinization. The rigidity of granules was a major factor determining the formation of either starch pastes or gels. [less ▲]

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See detailINFLUENCE OF DRYING TEMPERATURE ON THE CORN WET-MILLING PROCESS: REVIEW
Malumba Kamba, Paul ULg; Janas, Sébastien; Sindic, Marianne ULg et al

in Filipovic, Lovro, A. (Ed.) Milling: Operations, Applications and Industrial Effects (2011)

In order to separate its major components, corn kernel is processed using the wet-milling process during which steeping, milling and starch/gluten separations appear to be the most important operations ... [more ▼]

In order to separate its major components, corn kernel is processed using the wet-milling process during which steeping, milling and starch/gluten separations appear to be the most important operations. To improve the efficiency of this process, corn wet-milling industry expended considerable resources focusing on improved process control, more efficient process equipment and on the development of hybrids that decrease the variability and reduce production costs. However, important variability is still observed according to the thermal history of grain after harvesting. The present article reviews up-to-date literature on the effect of drying conditions on the corn wet-milling performance and the physicochemical and functional properties of corn wet-milled fraction. Literature in this topic shows that high drying temperature combined with high initial moisture content of grain impact significantly the wet-milling performance and the quality of recovered materials. Further studies on the influence of drying process on the quality of starch, gluten, germ and fiber recovered during the wet-milling process are needed and would help to develop more accurate engineering and economic models for the corn wet milling process. [less ▲]

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See detailInfluence of drying temperature on the solubility, the purity of isolates and the electrophoretic patterns of corn proteins
Malumba Kamba, Paul ULg; Vanderghem, Caroline ULg; Deroanne, Claude ULg et al

in Food Chemistry (2008), 111(3), 564-572

A sequential extraction of proteins from whole corn kernels dried between 54 and 130 degrees C was performed in order to elucidate the effect of the drying temperature on the solubility, the purity and ... [more ▼]

A sequential extraction of proteins from whole corn kernels dried between 54 and 130 degrees C was performed in order to elucidate the effect of the drying temperature on the solubility, the purity and the electrophoretic patterns of the different classes of corn proteins. It was observed that albumin, globulin and zein solubilities dropped significantly when the drying temperature increased, while fractions solubilised as glutelin-G(2) and glutelin-G3 increased until 110 degrees C before dropping slightly at 130 degrees C. The analysis of the solubility of different protein groups indicated that mechanisms other than the creation of new disulfide bonds between proteins occurred during the high temperature drying of corn. Except for glutelin-G1 and zein isolates, which were highly pure, the purities of albumin, globulin, glutelin-G2 and glutelin-G3 isolates after dialysis were influenced by the drying temperature. Sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) showed the disappearance of some water and salt-soluble poly-peptides at high drying temperatures. The electrophoretic patterns of zein and glutelin-G, were not significantly modified, although the solubility of zein was affected by the drying temperature. (c) 2008 Elsevier Ltd. All rights reserved. [less ▲]

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See detailInfluence of drying temperature on the wet-milling performance and the proteins solubility indexes of corn kernels
Malumba Kamba, Paul ULg; Janas, Sébastien ULg; Masimango, Thaddée et al

in Journal of Food Engineering (2009), 95

The effects of air drying temperature on the wet-milling performance and the proteins solubility indexes were investigated for corn kernels dried between 54°C and 130°C. It was observed that when the ... [more ▼]

The effects of air drying temperature on the wet-milling performance and the proteins solubility indexes were investigated for corn kernels dried between 54°C and 130°C. It was observed that when the drying temperature increases, the starch yield drops significantly. The gluten recovered increased abruptly for drying temperatures up to 80 C. The albumin, globulin and zein solubility indexes decreased continuously when corn drying temperatures increased. According to the temperatures used, the starch yield, the gluten recovered and the salt-soluble proteins solubility indexes were adjusted satisfactorily by using a two asymptotic logistic model. This model has the advantage of supplying information on the dynamic of the variation of described parameters. The solubility index of total salt-soluble proteins was shown to be a suitable indicator of the severity of the drying treatment in regard to the corn wet-milling performance. [less ▲]

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See detailInfluence of dung spreading on performance of lactating dairy cows
Dufrasne, Isabelle ULg; Gielen, Marc ULg; Limbourg, Pierre et al

in Proceedings of the 42nd Annual Meeting of E.A.A.P. (1991)

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See detailThe influence of Economics on agricultural systems: an evolutionary and ecological perspective
Maréchal, Kevin ULg; Aubaret-Joachain, H.; Ledant, J.-P.

E-print/Working paper (2008)

Putting agricultural systems on a more sustainable path is a crucial policy issue. Within that context, the objective of this paper is to show how the unsustainable character of current agricultural ... [more ▼]

Putting agricultural systems on a more sustainable path is a crucial policy issue. Within that context, the objective of this paper is to show how the unsustainable character of current agricultural systems is strongly related to the prevailing rationale of mainstream economics and the Cartesian-Newtonian worldview on which it is founded. Using the example of the ransformation of post-war agriculture in France, our analysis underlines the profound nfluence of the logic of mainstream economics on the modernisation of agricultural systems. The resulting transformation of agricultural systems based on the triptych specialisationintensification-concentration is then further explored regarding its negative impacts in terms of sustainability. Particular attention is dedicated to environmental impacts, given their magnitude and the fact that mainstream economics, because of its “mechanistic reductionist” framework, has intrinsic difficulties in dealing with them. Since the fundamental assumptions of mainstream economics are being strongly challenged, it becomes legitimate to resort to an alternative economic framework for designing appropriate policies and measures. Given that many empirical studies demonstrates that agricultural systems may be locked-in to some extent, the choice an evolutionary line of thought in an ecological perspective is quite straightforward. This approach of economic change both underlines its historically-contingent nature and the role played by systemic interdependencies. Through underlining the pathdependence of agricultural systems, the use of the evolutionary framework in an ecological perspective allows us to shed a new light on their transformation by suggesting some strategies (i.e. niche accumulation and hybridisation) that have proven efficient in overcoming cases of lock-in in other fields. [less ▲]

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See detailInfluence of electrical properties on the evaluation of the surface hydrophobicity of Bacillus subtilis
Ahimou, F.; Paquot, Michel ULg; Jacques, Philippe ULg et al

in Journal of Microbiological Methods (2001), 45(2), 119-126

The surface hydrophobicity of nine Bacillus subtilis strains in different states (spores, vegetative cells, and dead cells) was assessed by water contact angle measurements, hydrophobic interaction ... [more ▼]

The surface hydrophobicity of nine Bacillus subtilis strains in different states (spores, vegetative cells, and dead cells) was assessed by water contact angle measurements, hydrophobic interaction chromatography (HIC) and bacterial adhesion to hydrocarbon (BATH). Electrokinetic properties of B, subtilis strains were characterized by zeta potential measurements and found to differ appreciably according to the strain, Correlations between HIC data, BATH data and zeta potential showed that HIC and RATH are influenced by electrostatic interactions. Water contact angle measurements thus provide a better estimate of cell surface hydrophobicity. The water contact angle of B. subtilis varied according to the strain and the state, the spores tending to be more hydrophobic than vegetative cells. (C) 2001 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailInfluence of Electrolytes and High Viscosity on Liquid-Liquid Separation
Anusarn, K; Chuttrakul, Pornprapa; Schmidt, P et al

in World Academy of Science, Engineering and Technology (2012), 6(72), 193-197

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See detailInfluence of Electrolytes on Liquid-Liquid Extraction
Pfennig, Andreas ULg; Schwerin, Albrecht

in Industrial & Engineering Chemistry Research (1998), 37(8), 3180-3188

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See detailInfluence of electrolytes on liquid-liquid separation
Blesinger, C; Effertz, M; Kopriwa, N et al

Conference (2011)

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