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See detailDetermination of Moisture Diffusivity During Drying of Mortar Cement: Experimental and Modeling Study
Bennamoun, Lyes ULiege; Kahlerras, Loubna ULiege; Michel, Frédéric ULiege et al

in International Journal of Energy Engineering (2013), 3(1), 1-6

The aim of this study is the experimental characterization of the behaviour of a mortar during convective drying. We focalise on mortar that has a rate water-cement of 0.5. The drying tests are developed ... [more ▼]

The aim of this study is the experimental characterization of the behaviour of a mortar during convective drying. We focalise on mortar that has a rate water-cement of 0.5. The drying tests are developed in a micro-convective dryer that can use samples weighing from 0 to 8g. The advantage of these experiments is to reproduce the natural conditions that can be found during the treatment of the mortar-atmosphere problems. The response of the drying curve or the drying kinetic depends on the applied drying conditions. So, the temperature of the air varies from 60°C to 130°C, the velocity of the air is changed from 2 m.s-1 to 5 m. s-1and the relative humidity is kept less than 1.7%. The comparison between the experimental results and the proposed analytical solutions of the equation of diffusion represented by Fick’s law, applied for a finite shape, allows determination of the values of the diffusion coefficient. It has a value of 1.71×10-10 m2.s-1 at 60°C, 13.69×10-10 m2.s-1 at 90°C and 16.27×10-10 m2.s-1 at 130°C. Calculation of the activation energy and the D0 constant are also possible. [less ▲]

Detailed reference viewed: 164 (47 ULiège)
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See detailDetermination of muscle mitochondrial respiratory capacity in Standardbred racehorses as an aid to predicting exertional rhabdomyolysis
Houben, Rosa ULiege; Leleu, Claire; Fraipont, Audrey ULiege et al

in Mitochondrion (2016), 24

This prospective cohort study evaluated the potential of high-resolution respirometry applied to permeabilized muscle fibers for fitness evaluation in French Standardbred racehorses. Fitness evaluation by ... [more ▼]

This prospective cohort study evaluated the potential of high-resolution respirometry applied to permeabilized muscle fibers for fitness evaluation in French Standardbred racehorses. Fitness evaluation by means of respirometric parameters did not correlate with racing performance registered over the following racing season. However, altered mitochondrial energy metabolism was associated with higher risk of developing exertional rhabdomyolysis, a common cause of exercise intolerance in racehorses. These data represent a first step towards establishing reference values for muscle OXPHOS capacity in this breed. [less ▲]

Detailed reference viewed: 62 (14 ULiège)
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See detailDetermination of myoglobin in serum by kinetic turbidimetry, using the turbitimesystem
Chapelle, Jean-Paul ULiege; El Allaf, M.

in Clinical Chemistry (1990), 36(6), 1193

Detailed reference viewed: 10 (1 ULiège)
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See detailDetermination of N-acetylcysteine and its metabolites in plasma by LC-MS-MS
Toussaint, B.; Streel, B.; Ceccato, Attilio ULiege et al

Poster (2000)

Detailed reference viewed: 145 (0 ULiège)
Peer Reviewed
See detailDetermination of N-acetylcysteine and its potential degradation products by LC/APCI+/MS/MS
Toussaint, B.; Ceccato, Attilio ULiege; Maes, P. et al

Conference (1997)

Detailed reference viewed: 135 (1 ULiège)
Peer Reviewed
See detailDetermination of N-acetylcysteine and its potential degradation products by LC/MS/MS
Toussaint, B.; Ceccato, Attilio ULiege; Hubert, Philippe ULiege et al

Poster (1997)

Detailed reference viewed: 1004 (3 ULiège)
Peer Reviewed
See detailDetermination of Non-Steroidal Anti-Inflammatory Drugs by Capillary Zone Electrophoresis
Bechet, I.; Paques, Ph.; Fillet, Marianne ULiege et al

Poster (1994)

Detailed reference viewed: 7 (1 ULiège)
Peer Reviewed
See detailDetermination of optimal load shedding against voltage instability
Moors, Cédric; Van Cutsem, Thierry ULiege

in Proc. 13th Power System Computation Conference (PSCC) (1999, June)

Detailed reference viewed: 105 (8 ULiège)
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See detailDetermination of optimum conditions for preservation and reactivation of freeze-dried Acetobacter senegalensis used as vinegar starter
Shafiei, Rasoul ULiege; Thonart, Philippe ULiege

Poster (2011, November)

Availability of efficient starters is one of the most important elements during fermentation technology. Acetic acid bacteria (AAB) face extreme conditions (low pH, high acetic acid concentration (>7 ... [more ▼]

Availability of efficient starters is one of the most important elements during fermentation technology. Acetic acid bacteria (AAB) face extreme conditions (low pH, high acetic acid concentration (>7%), ethanol and high temperature) during vinegar fermentation. In spite of introduction of broth media contained viable AAB as starter by some companies; traditional methods for initiation of vinegar fermentation are still used even in modern factories, therefore there is a long Lag phase for initiation of fermentation. In recent studies in CWBI, a kind of lyophilized starter has been produced by using an isolated thermotolerant bacterium: Acetobacter senegalensis. The aim of this study is to determine the best media for revitalization and the optimum temperature for preservation of the freeze-dried cells. To produce biomass, glucose was used as carbon source in batch culture under regulated conditions. The cells harvested when they reached to stationary phase. Harvested cells suspended in spent growth medium (final supernatant of fermentation). Maltodextrin (10%), manitol (20%) and spent growth medium were used as protestants. After freeze-drying they were subjected to storage test at -20° C, 4° C and 35° C for six months. The viability of cells determined by using spread plate technique using three different media: YG (yeast extract, glucose) and YGE (yeast extract, glucose, ethanol) and YGEA (yeast extract, glucose, ethanol, acetic acid). According to residual viable cells, manitol and maltodextrin showed higher protective functions rather than spent growth medium (92.3%, 88.2% and 82.1% survival, respectively) during freeze-drying process. Viability of cells during rehydration is completely dependent to the composition of the broth media used for this purpose. Adding ethanol (>0.5%) or acetic acid (>1%) to rehydration medium caused 40-45% reduction in viable cell numbers in comparison to YG broth. The composition of culture media can also influence the growth of bacteria after rehydration. In YG, much higher cell growth (about 1 log unit) was observed in comparison to YGE and YGEA. Addition of glucose (20 g/l) to YGE can neutralize the adverse effect of ethanol considerably but it cannot improve the growth in YGEA. This can be partially explained according to the activity of alcohol dehydrogenase and acetaldehyde dehydrogenase. It was revealed that freeze-dried cells had very low activities for these two enzymes. Analysis of total soluble protein contents of lyophilized cells during storage at different conditions revealed that the soluble protein content of cells reduced by increasing the storage temperature. At 35° C after 15 days, there were 4.87 log units reduction in the viability of cells, and also about 14% less soluble protein was detectable under this condition whereas keeping of cells at -20 or + 4° C had no influences on protein and viability of cells. Storage of cells at +4° C in darkness for six month showed that about 79.2% and 68.3% viability of cells remained for cells protected by manitol and maltodextrin, respectively. To assess the real activity of lyophilized cells as starters, they were introduced to broth media (YGE contained 20g/l of glucose). It was seen that 6 months old lyophilized cells (with maltodextrin or manitol as protectants) were able to grow and consume 5 v/v of ethanol in 48 hr in the presence of initial acetic acid concentration (0.5%) at 30° C. In conclusion, the mentioned methods for preservation and reactivation of freeze-dried Acetobacter senegalensis can provide a promising tool for decreasing the lag phase of vinegar fermentation. [less ▲]

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See detailDetermination of organochlorine pesticide residues in the blood of healthy individuals
Charlier, Corinne ULiege; Plomteux, Guy ULiege

in Clinical Chemistry & Laboratory Medicine (2002), 40(4), 361-364

Pesticide use is one of several factors that have permitted maintenance of our supply of food in spite of continuing increase of the population. However, the use of biologically active compounds poses ... [more ▼]

Pesticide use is one of several factors that have permitted maintenance of our supply of food in spite of continuing increase of the population. However, the use of biologically active compounds poses potential problems of toxicity. If the compound is used at any stage of food production, residues or derivatives may persist in food and the entire population may be exposed to the trace amounts of the material. The human body burden associated with long-term exposure may or may not be associated with illness. Persistent environmental contaminants such as pesticide residues have long been suspected to be implicated in cancer etiology. Organochlorine chemicals are persistent, lipophilic compounds commonly present in the environment. Some of them demonstrated carcinogenic activity in laboratory animals. Controversy still exists concerning their carcinogenic potential in humans. To answer this question, clinical toxicology laboratories should propose validated methodologies able to identify and quantify pesticide residues in biological samples. An example of chromatographic method dedicated to organochlorine residues is presented here and illustrated by results obtained in a healthy population (104 men, 147 women). Only 17.9% of the samples were free from detectable amounts of pesticides and p,p’-DDE 1,1-dichloro-2,2-bis(p-chlorophenyl) ethylene was the most frequently detected residue (66.5%). Hexachlorobenzene was found at detectable level in 13.5% of the samples. [less ▲]

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See detailDetermination of organohalogenated contaminants in liver of harbour porpoises (Phocoena phocoena) stranded on the Belgian North Sea coast
Covaci, Adrian; Van de Vijver, Kristin Inneke; De Coen, Wim et al

in Marine Pollution Bulletin (2002), 44(10),

Detailed reference viewed: 41 (15 ULiège)
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See detailDetermination of PAG in the milk and blood in cow’s in comparison to other examination methods for pregnancy diagnosis.
Gajewski, Z.; Melo de Sousa, Noelita ULiege; Konopka, A. A. et al

in Magyar Allatorvosok Lapja = Hungarian Veterinary Journal (2008), (Suppl II), 190

Detailed reference viewed: 13 (0 ULiège)
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See detailDetermination of Particle Size, Surface Area, and Shape of Supplementary Cementitious Materials by Using Different Techniques
Arvaniti, Eleni; Juenger, Maria; Bernal, Susan et al

in Materials and Structures (2015), 48(11), 3687-3701

The particle size distribution, surface area and shape are fundamental characteristics of supplementary cementitious materials (SCMs). Accurate measurement of these properties is required in computational ... [more ▼]

The particle size distribution, surface area and shape are fundamental characteristics of supplementary cementitious materials (SCMs). Accurate measurement of these properties is required in computational efforts to model the hydration process, and the characterization of these parameters is also an important practical issue during the production and use of blended cements. Since there are no standard procedures specifically for the determination of physical properties of SCMs, the techniques that are currently used for characterizing Portland cement are applied to SCMs. Based on the fact that most of the techniques have been developed to measure cements, limitations occur when these methods are used for other materials than cement, particularly when these have lower fineness and different particle shape and mineralogical composition. Here, samples of fly ash, granulated blast furnace slag and silica fume were tested. Different results obtained using several methods for the determination of specific surface area are presented. Recommendations for testing SCMs using air permeability, sieving, laser diffraction, BET, image analysis and MIP are provided, which represent an output from the work of the RILEM Technical Committee on Hydration and Microstructure of Concrete with Supplementary Cementitious Materials (TC-238-SCM). [less ▲]

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See detailDetermination of phenolic organohalogens in human serum from a Belgian population and assessment of parameters affecting the human contamination
Dufour, Patrice ULiege; PIRARD, Catherine ULiege; CHARLIER, Corinne ULiege

in Science of the Total Environment (2017), 599-600

Many in vitro or in vivo studies highlighted the potential deleterious effects of phenolic organohalogenated compounds (POHs) on the health, particularly on the thyroid system homeostasis, however few ... [more ▼]

Many in vitro or in vivo studies highlighted the potential deleterious effects of phenolic organohalogenated compounds (POHs) on the health, particularly on the thyroid system homeostasis, however few large scale human epidemiological studies have been carried out, especially in Europe. Further studies monitoring the human contamination by POHs, the sources of exposure and the influence of these compounds on thyroid health are still needed. Therefore we determined the concentrations of 16 POHs (pentachlorophenol (PCP), tetrabromobisphenol A (TBBPA), 4 bromophenols (BPs), 3 hydroxy-polybromodiphenylethers (OH-PBDEs) and 7 hydroxy-polychlorobiphenyls (OH-PCBs)) in serum from 274 people aged from 18 to 76 years old living in Liege (Belgium) and the surrounding area. A questionnaire about their alimentary habits, life style and home environment was also administered to the volunteers. The predominant compound measured in the population was PCP (median concentration of 593.0 pg mL−1). 4-OH-CB 107, 4-OH-CB 146 and 4-OH-CB 187 were detected in all samples and contributed for 75% of the sum of OH-PCBs (ΣOH-PCBs). The median measured in our population for ΣOH-PCBs was 143.7 pg mL−1. TBBPA and 2,4,6-tribromophenol were detected in 31% and 63.8% of the samples respectively while the detection frequency observed for the other BPs and the OH-PBDEs was close to zero. We computed multivariate regression models in order to assess the influence of demographic and lifestyle parameters on the PCP and ΣOH-PCBs contamination levels. Significant correlation was found between the PCP concentration and sex, smoker status, sea fish consumption and level of education, although the model seemed to be a poor (R2 = 0.14) predictor of the PCP concentration. The model computed for ΣOHPCBs was more explanatory (R2 = 0.61) and involved age, BMI and sea fish consumption. Finally, we assessed the parameters affecting the ΣOH-PCBs/ΣPCBs ratio. The model proposed involved age, BMI, smoker status and parent PCB level, and explained 41% of the variability of the ΣOH-PCBs/ΣPCBs ratio. [less ▲]

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See detailDetermination of phospholipids extracted from Tsukamurella paurometabola C-924 after freeze-drying and during the subsequent storage
Coulibaly, I.; Dauphin, R. D.; Destain, Jacqueline ULiege et al

Scientific conference (2010)

The total lipids of Tsukamurella paurometabola C-924 were analyzed after freeze-drying. Seven individual lipids classes were identifiednamelyneutrallipids(NLs),fattyacids(FAs),phospholipids(PLs ... [more ▼]

The total lipids of Tsukamurella paurometabola C-924 were analyzed after freeze-drying. Seven individual lipids classes were identifiednamelyneutrallipids(NLs),fattyacids(FAs),phospholipids(PLs),sterolester(SEs),triglycerides(TGs),diglycerides (DGs) and monoglycerides (MGs). The principal fatty acids identified in most lipid classes were palmitic (C 16:0), palmitoleic (C 16:1), oleic (C 18:1), linoleic (C 18:2), and linolenic (C 18:3). PLs were the major constituents and accounted for 50-60% of the total lipids. PLs were fractionated. PLs of Tsukamurella paurometabola content phosphatidic acid (PA), phosphatidylethanolamine (PE), phosphatidylinositol (PI), phosphatidylcholine (PC), sphingomyelin (SM), lysophosphatidylcholine (LPC) and phosphatidylglycerol (PG). It was observed that PG had the highest proportion at most points relative to other PLs and was the predominant component of PLs (30%-56%). Evolution of individual rate was followed during storage at 20°C and 40°C with or without lithothamne400®, respectively. [less ▲]

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See detailDetermination of phospholipids extracted from Tsukamurella paurometabola C-924 after freeze-drying and during the subsequent storage.
Coulibaly, Ibourahema ULiege; Yao, Amenan Anastasie ULiege; Dubois Dauphin, Robin ULiege et al

Poster (2009, April 01)

The total lipids of Tsukamurella paurometabola C-924 were analysed after freeze-drying. Seven individual lipids classes were identified namly neutral lipids (NLs), fatty acids (FAs), phospholipids (PLs ... [more ▼]

The total lipids of Tsukamurella paurometabola C-924 were analysed after freeze-drying. Seven individual lipids classes were identified namly neutral lipids (NLs), fatty acids (FAs), phospholipids (PLs), sterol ester (SEs), triglycerides (TGs), diglycerides (DGs) and monoglycerides (MGs). The principal fatty acids identified in most lipid classes were palmitic (C16:0), palmitoleic (C16:1), oleic (C18:1), linoleic (C18:2), and linolenic (C18:3). PLs were the major constituents and accounted for 50-60% of the total lipids. PLs were fractionated. . PLs of Tsukamurella paurometabola content phosphatidic acid (PA), phosphatidylethanolamine (PE), phosphatidylinositol (PI), phosphatidylcholine (PC), sphingomyelin (SM), lysophosphatidylcholine (LPC) and phosphatidylglycerol (PG). It was observed that PG had the highest proportion at most points relative to other PLs and was the predominant component of PLs (30%-56%). Evolution of individual rate was followed during stored at 20°C and 40°C with or without lithothamne400®, respectively. [less ▲]

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See detailDetermination of photodissociation and radiative association cross sections from the same time-dependent calculation
Vranckx, Stéphane; Loreau, Jérôme; Desouter, Michèle ULiege et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2013), 46

Detailed reference viewed: 18 (1 ULiège)