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See detailAnalysis of periods with strong and coherent CO2 advection over a forested hill
Zeri, Marcelo; Rebmann, Corinna; Feigenwinter, Christian et al

in Agricultural and Forest Meteorology (2010), 150(5), 674-683

Horizontal and vertical advective fluxes of CO2 measured during the CarboEurope-IP advection experiment (ADVEX) at the Wetzstein spruce forest site in Thuringia, Germany, were related to wind direction ... [more ▼]

Horizontal and vertical advective fluxes of CO2 measured during the CarboEurope-IP advection experiment (ADVEX) at the Wetzstein spruce forest site in Thuringia, Germany, were related to wind direction, stratification regime and friction velocity u*. Measurements of wind speed and direction carried out at one of the slopes of the ridge revealed the existence of reverse flow below the canopy on the downwind side. This uphill flowoccurred concurrently with the advective fluxes measured at the top of the hill. Such result is in agreement with recent modeling works that support the existence of advection at low hills covered with a canopy. Another experimental evidence that suggest a link between advection at this site with the flow over the hill came from the analysis of the horizontal gradient of CO2 inside the volume formed by the ADVEX towers. It was observed that CO2 accumulated near the downwind side of the crest for cross-ridge flows, what is consistent with another modeling work of the transport of scalars across a low hill covered with a canopy. [less ▲]

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See detailAnalysis of PIV measurements using modal decomposition techniques, POD and DMD, to study flow structures and their dynamics within a stirred-tank reactor
de Lamotte, Anne ULiege; Delafosse, Angélique ULiege; Calvo, Sébastien ULiege et al

in Chemical Engineering Science (2018)

The present work is a comparative analysis of Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) computed on experimental turbulent velocity fields measured in a 20L-tank stirred ... [more ▼]

The present work is a comparative analysis of Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) computed on experimental turbulent velocity fields measured in a 20L-tank stirred by two Rushton impellers at two rotating speeds, N = 150 and 300 rpm. POD identifies flow structures that optimally capture the total kinetic energy of the flow, while DMD identifies structures that significantly contribute to the dynamics of the flow. The experimental data, i.e. the instantaneous radial and axial velocity fields, come from 2-D Particle Image Velocimetry (PIV). The flow motion is turbulent, and it occurs over a wide range of length and time scales, from equipment-dependent large-scale coherent structures to the smallest-scale eddies where energy dissipation takes place. It thus provides an interesting benchmark case for the comparison between POD and DMD, which are based on energy and dynamic analysis, respectively. POD analysis reveals that the most energetic structures are related to the inherent periodic unsteadiness due to the relative motion between the rotating impeller blades and the non-moving baffles. Apart from the mean field, the first most energetic group of modes is related to trailing vortices induced by the Rushton turbines and is associated to a frequency equivalent to the blade passage frequency and its overtones. The second most energetic group of modes is related to vortical structures in the impeller stream and is associated to a frequency equivalent to the rotating speed. DMD analysis identifies flow structures that are found similar to these most energetic modes, although differences appear due to the fact that DMD isolates structures associated to a single frequency and their corresponding growth/decay rate. As in POD, the relative importance of each DMD mode can be estimated using an appropriately defined energy criterion. Comparison of the results from both modal decomposition methods points out their complementarity and their potential for describing the spatial and time characteristics of the flow within a stirred tank. [less ▲]

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See detailAnalysis of plasma IGF-I hormone levels in Holstein-Friesian Heifers
Horvai-Szabo, M.; Renaville, Robert ULiege; Dohy, J.

in Journal of Dairy Science (2000), 83(suppl 1), 48

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See detailAnalysis of plasma IGF-I hormone levels in Holstein-Friesian Heifers.
HorvaI-Szabo, M.; Renaville, Robert ULiege; Dohy, J.

Poster (2000)

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See detailAnalysis of polar lipids from milk fat globale membrane (MFGM) by SPE and HPLC-ELSD.
Bodson, Pascal; Danthine, Sabine ULiege; Blecker, Christophe ULiege

Poster (2006, October)

Detailed reference viewed: 38 (1 ULiège)
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See detailAnalysis of Pollen and Nectar of Arbutus unedo as a Food Source for Bombus terrestris (Hymenoptera : Apidae)
Rasmont, Pierre; Regali, Ariane; Ings, Thomas C. et al

in Journal of Economic Entomology (2005), 98(3), 656-663

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See detailAnalysis of pollutants with GcxGc-HRTOFMS
Focant, Jean-François ULiege

Scientific conference (2011, February)

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See detailAnalysis of polychlorinated biphenyl residues in human plasma by gas chromatography-mass spectrometry
Charlier, Corinne ULiege; Dubois, Nathalie ULiege; CUCCHIARO, Séverine ULiege et al

in Journal of Analytical Toxicology (2003), 27(2), 74-77

A method for the determination of seven polychlorinated biphenyl residues in plasma by gas chromatography-mass spectrometry was developed. The analytes were isolated from human plasma by liquid-liquid ... [more ▼]

A method for the determination of seven polychlorinated biphenyl residues in plasma by gas chromatography-mass spectrometry was developed. The analytes were isolated from human plasma by liquid-liquid extraction, followed by solid-phase extraction, and separation on an HP5 Trace column. Ionization mode was electronic impact, and selected ion storage was used for isolation and quantitation of the compounds. The method was evaluated for its analytical performances and therefore applied to monitor the prevalence of these seven polychlorinated biphenyl residues in a female population. Eighty samples were analyzed, and 82.5% presented detectable amounts of at least one residue. For the population study, results were reported on a lipid-adjusted basis. Because the proposed method is satisfying and seems to be suitable for the quantitation of PCB congeners in a general population, epidemiological studies to evaluate the widespread contamination with these environmental compounds can be proposed. [less ▲]

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See detailAnalysis of POPs in 20μL blood by MEPS-GC-MS/MS
L'Homme, Benjamin ULiege; Focant, Jean-François ULiege

in Hyphenated Techniques in Chromatography HTC-13 - Book of abstracts (2014, January)

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See detailAnalysis of positional candidate genes in the AAA1 susceptibility locus for abdominal aortic aneurysms on chromosome 19.
Lillvis, J. H.; Kyo, Y.; Tromp, G. et al

in BMC Medical Genetics (2011), 12(1), 14

ABSTRACT: BACKGROUND: Abdominal aortic aneurysm (AAA) is a complex disorder with multiple genetic risk factors. Using affected relative pair linkage analysis, we previously identified an AAA ... [more ▼]

ABSTRACT: BACKGROUND: Abdominal aortic aneurysm (AAA) is a complex disorder with multiple genetic risk factors. Using affected relative pair linkage analysis, we previously identified an AAA susceptibility locus on chromosome 19q13. This locus has been designated as the AAA1 susceptibility locus in the Online Mendelian Inheritance in Man (OMIM) database. METHODS: Nine candidate genes were selected from the AAA1 locus based on their function, as well as mRNA expression levels in the aorta. A sample of 394 cases and 419 controls was genotyped for 41 SNPs located in or around the selected nine candidate genes using the Illumina GoldenGate platform. Single marker and haplotype analyses were performed. Three genes (CEBPG, PEPD and CD22) were selected for DNA sequencing based on the association study results, and exonic regions were analyzed. Immunohistochemical staining of aortic tissue sections from AAA and control individuals was carried out for the CD22 and PEPD proteins with specific antibodies. RESULTS: Several SNPs were nominally associated with AAA (p < 0.05). The SNPs with most significant p-values were located near the CCAAT enhancer binding protein (CEBPG), peptidase D (PEPD), and CD22. Haplotype analysis found a nominally associated 5-SNP haplotype in the CEBPG/PEPD locus, as well as a nominally associated 2-SNP haplotype in the CD22 locus. DNA sequencing of the coding regions revealed no variation in CEBPG. Seven sequence variants were identified in PEPD, including three not present in the NCBI SNP (dbSNP) database. Sequencing of all 14 exons of CD22 identified 20 sequence variants, five of which were in the coding region and six were in the 3'-untranslated region. Five variants were not present in dbSNP. Immunohistochemical staining for CD22 revealed protein expression in lymphocytes present in the aneurysmal aortic wall only and no detectable expression in control aorta. PEPD protein was expressed in fibroblasts and myofibroblasts in the media-adventitia border in both aneurysmal and non-aneurysmal tissue samples. CONCLUSIONS: Association testing of the functional positional candidate genes on the AAA1 locus on chromosome 19q13 demonstrated nominal association in three genes. PEPD and CD22 were considered the most promising candidate genes for altering AAA risk, based on gene function, association evidence, gene expression, and protein expression. [less ▲]

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See detailAn analysis of potential resistance of the phytophagous mite, Tetranychus urticae Koch (Acari: Tetranychidae) to four botanical pesticides
Attia, Sabrine; Lebdi, KL; Heuskin, Stéphanie ULiege et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2015), 19(3), 232-238

Description of the subject. Synthetic acaricides have been widely used to manage Tetranychus urticae. Due to the excessive use of biocide and the associated problems of pesticide resistance and ... [more ▼]

Description of the subject. Synthetic acaricides have been widely used to manage Tetranychus urticae. Due to the excessive use of biocide and the associated problems of pesticide resistance and environmental pollution, there is an increasing demand for sustainable, environmentally-friendly control methods. Among the current alternative strategies aimed at decreasing the pest populations, the pesticides based on plant extracts are currently one of the most promising methods. Essential oils with acaricidal properties have been categorized as green pesticides because they are biodegradable and predominantly non-toxic to vertebrates. Objectives. With an aim to reduce the use of synthetic pesticides, they represent a promising approach for eco-chemical control of mites. Method. The aim of the present work was to analyze the risk of resistance emergence of T. urticae to repeated treatments with four plant extracts: Deverra scoparia Coss. & Durieu (Araliales: Apiaceae), Hertia cheirifolia (L.) Kuntze (Asterales: Ateraceae), Santolina africana Jord. & Fourr. (Asterales: Asteraceae) essential oils and garlic distillate Allium sativum L. (Asparagales: Alliaceae) after 20 generations. Results. Repeated treatments with S. africana essential oil during 20 generations did not provoke an emergence of resistance while a low development of resistance was observed with H. cheirifolia, A. sativum and D. scoparia extracts. Conclusions. The efficacy of these extracts against the two spotted spider mite and their low development of resistance make them a promising use for pest management. [less ▲]

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See detailAnalysis of product designers' creative and cognitive processes. Recommendations for the development of EsQUIsE to support Product Design.
Elsen, Catherine ULiege

Master's dissertation (2007)

The goal of this work is to analyse the product designers’ main habits in creation and cognition, to study the sketches’ contributions to early stages of design processes (these sketches being one common ... [more ▼]

The goal of this work is to analyse the product designers’ main habits in creation and cognition, to study the sketches’ contributions to early stages of design processes (these sketches being one common feature in creation that designers have with architects) in order to evaluate if EsQUIsE could support product design. Several questions sequence this evaluation: i) What are the main product designers’ work’s methods? What type of projects do they usually approach? What kind of issues, constraints do they have to confront? ii) What are the cognitive processes involved during the design phases? iii) When and how do sketches enter these processes? What are their effectiveness, their main contributions and on the opposite their main limitations? iv) Assuming that sketches constitute for product designers an effective support for the early creative phases, what are their principal characteristics? What do they content? What are their predominant graphic codes in this particular domain? v) What are the nowadays Computer-aided design tools’ appointed functions in product design? What are their advantages and drawbacks? How could they become better adapted to preliminary design phases? These interrogations are considered thanks to the following work methodology: • First an information collecting through a short state of art. The following subjects are: projects and constraints analysis; technical background; summary of the principal creative and cognitive processes in design; study of sketches potentials; advantages and limitations of actual CAD tools and short listing of the main software used in product design. • Then a straight contact with designers through interviews in order to collect their points of view on the previous subjects. • Follow the appreciation of the previous theories and collected information thanks to the pragmatic character of two experiments. These experiments bring new elements. They afford a better understanding of the general design theories, they confirm the sketches’ and 3D representations’ contributions to the design processes and furnish the first basis of graphic codes’ and sketches contents’ analysis. • Finally, the observation of graphic designers during the modelling of a simple object permits the deeper analyse of the relationship the user maintains toward nowadays CAD tools. A summary of the multiple aspects EsQUIsE should present to efficiently support the early conception phases in product design concludes this research. [less ▲]

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See detailAnalysis of proline permease gene expression at the molecular level
Jauniaux, J. C.; Vandenbol, Micheline ULiege; Vissers, S. et al

Poster (1986)

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See detailAnalysis of properdin (BF) genotypes associated with litter size in a commercial pig cross population
Buske, Bernd ULiege; Brunsch, Christa; Zeller, Karin et al

in Journal of Animal Breeding & Genetics (2005), 122(4), 259-263

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See detailAnalysis of protamine peptides in insulin pharmaceutical formulations by capillary electrophoresis.
Lamalle, Caroline; Servais, Anne-Catherine ULiege; Demelenne, Alice ULiege et al

in Journal of Separation Science (2016), 39(6), 1189-94

Protamines are a group of highly basic peptides that are sometimes added to insulin formulations to prolong the pharmacological action. In this study, different methods were investigated to identify ... [more ▼]

Protamines are a group of highly basic peptides that are sometimes added to insulin formulations to prolong the pharmacological action. In this study, different methods were investigated to identify protamine in insulin formulations. Capillary electrophoresis in aqueous and non-aqueous media was tested to separate these peptides with very close amino acid sequences. Different buffers (phosphate or formate, both acidified) and various additives (principally negatively charged and neutral surfactants) were investigated to optimize peptide separation. Finally, a micellar electrokinetic capillary chromatography method using a capillary of 120 cm effective length and an aqueous background electrolyte made up of 100 mM phosphate buffer (pH 2) and 50 mM Thesit(R) gave the best results, providing the separation of the four major protamine peptides within 25 min. [less ▲]

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See detailAnalysis of PSII antenna size heterogeneity of Chlamydomonas reinhardtii during state transitions
de Marchin, Thomas ULiege; Ghysels, Bart ULiege; Nicolay, Samuel ULiege et al

in Biochimica et Biophysica Acta-Bioenergetics (2014), 1837(1), 121-130

PSII antenna size heterogeneity has been intensively studied in the past. Based on DCMU fluorescence rise kinetics, multiple types of photosystems with different properties were described. However, due to ... [more ▼]

PSII antenna size heterogeneity has been intensively studied in the past. Based on DCMU fluorescence rise kinetics, multiple types of photosystems with different properties were described. However, due to the complexity of fluorescence signal analysis, multiple questions remain unanswered. The number of different types of PSII is still debated as well as their degree of connectivity. In Chlamydomonas reinhardtii we found that PSIIα possesses a high degree of connectivity and an antenna 2-3 times larger than PSIIβ, as described previously. We also found some connectivity for PSIIβ in contrast with the majority of previous studies. This is in agreement with biochemical studies which describe PSII mega-, super- and core- complexes in Chlamydomonas. In these studies, the smallest unit of PSII in vivo would be a dimer of two core complexes hence allowing connectivity. We discuss the possible relationships between PSIIα and PSIIβ and the PSII mega-, super- and core- complexes. We also showed that strain and medium dependent variations in the half-time of the fluorescence rise can be explained by variations in the proportions of PSIIα and PSIIβ. When analyzing the state transition process in vivo, we found that this process induces an inter-conversion of PSIIα and PSIIβ. During a transition from state 2 to state 1, DCMU fluorescence rise kinetics are satisfactorily fitted by considering two PSII populations with constant kinetic parameters. We discuss our findings about PSII heterogeneity during state transitions in relation with recent results on the remodeling of the pigment-protein PSII architecture during this process. [less ▲]

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See detailAnalysis of PSII antenna size heterogeneity of Chlamydomonas reinhardtii during state transitions - Colloque annuel de la Société Française de Photosynthèse
de Marchin, Thomas ULiege; Ghysels, Bart ULiege; Nicolay, Samuel ULiege et al

Conference (2013, June 18)

PSII antenna size heterogeneity has been extensively studied in the past. Based on in vivo DCMU fluorescence rise kinetics, at least two types of photosystems were described. They differ by their apparent ... [more ▼]

PSII antenna size heterogeneity has been extensively studied in the past. Based on in vivo DCMU fluorescence rise kinetics, at least two types of photosystems were described. They differ by their apparent antenna size and connectivity (this last term refers to the transfer of absorbed energy from a closed PSII unit to an open neighboring unit). In this study, we analysed PSII heterogeneity in Chlamydomonas reinhardtii using non-linear linear regression fitting on in vivo DCMU fluorescence rise kinetics, with a focus on changes in PSII heterogeneity associated with state transitions. We found that PSIIα possesses a high degree of connectivity and an antenna about 3 times larger than PSIIβ, as described previously. In contrast with most earlier studies, we found some connectivity for PSIIβ (although it was highly variable). This is in agreement with recent models based on biochemical and structural analysis of PSII after gel filtration separation which describe PSII mega-, super- and core- complexes in Chlamydomonas. According to these studies, the smallest unit of PSII in vivo would be a dimer of two core complexes hence still allowing connectivity. We also showed that strain and medium dependent variations in the half-time of the fluorescence rise, generally taken as an indicator of the average cross-section of PSII, can be explained by variations in the proportions of PSIIα and PSIIβ. When analyzing the state transition process, we showed for the first time in vivo that it induces an inter-conversion of PSIIα and PSIIβ. These findings are discussed with respect to the latest insights on the remodeling of the pigment-protein PSII architecture during this process. [less ▲]

Detailed reference viewed: 88 (24 ULiège)