Reaction of 1-alkynyltrialkylaluminates with butyl and phenylsulfenyl chloride. A new stereoseclective rearrangement

Poster (2001, January 13)

Controls on denitrification in a riparian buffer strip in a small headwater catchment in south Belgium.

Poster (2001)

Study of aggregation errors of the MODIS land cover image using analytical equations and spatial pattern metrics

Poster (2001)

Betterave OGM résistante au round up/betterave classique : comparaison du coût énergétique

Poster (2001)

Derived state of Weberian characters in Loricaroids and Amphiliids

Poster (2001)

Does spleen innervation influence TSE pathogenesis?

Poster (2001)

Pros and cons of universal varicella vaccination in Europe : the Eurovar initiative

Poster (2001)

A methodological approach towards assessment of land-use and land-cover change

Poster (2001)

Le fardeau des accompagnants dans la maladie d'Alzheimer avant et après une prise en charge cognitive

Poster (2001)

Method for the determination of the surface composition of alloy nanocrystallites in bimetallic catalysts

Poster (2001)

Evaluation of the antitrypanosomal activity of several plants traditionally used in Benin to treat sleeping sickness

Poster (2001)

Hensen's cells as precursors of supernumerary OHCs

Poster (2001)

Sexual compatibility between two heterochronic morphs in the Alpine newt

Poster (2001)

Numerous populations of newts and salamanders are dimorphic: while some larvae become mature and thus paedomorphic, others metamorphose and become adult later. The two morphs largely differ in morphology ... [more ▼]

Numerous populations of newts and salamanders are dimorphic: while some larvae become mature and thus paedomorphic, others metamorphose and become adult later. The two morphs largely differ in morphology. According to sexual selection theories, we could expect some female choice towards the alternative morphs. Although paedomorphosis can be adaptive in allowing resource partitioning and an earlier age at maturity, it is worth to determine the strength of sexual isolation between morphs. Indeed, whereas sexual compatibility may promote maintenance of polymorphism by mixing genes, sexual isolation could be the first step to sympatric speciation. We staged more than 200 encounters involving the four possible crosses within and between the heterochronic morphs of the Alpine newt, Triturus alpestris (Amphibia, Caudata). We took into account both quantitative and qualitative aspects of behaviours, with particular emphasis on the success of sperm transfer. We also determined secondary sexual characters. The success of heterotypic and homotypic encounters was similar, involving then sexual compatibility between the two heterochronic morphs. Paedomorphs and metamorphs displayed identical behavioural patterns at similar frequencies. Females did not appear to be selective against males on the basis of their epigamic characters. Our results do not support hypotheses predicting sympatric speciation from polymorphic species. On the other hand, they are in favour of the models predicting maintenance of polymorphism [less ▲]

The effect of food on ontogenetic pathway switching in paedomorphic Alpine newts

Poster (2001)

Paedomorphosis concerns the retention of larval characteristics in adult individuals. Newts that forgo metamorphosis and then retain gill and gill slits in the adult stage maintain an aquatic life but ... [more ▼]

Paedomorphosis concerns the retention of larval characteristics in adult individuals. Newts that forgo metamorphosis and then retain gill and gill slits in the adult stage maintain an aquatic life but keep potential for undergoing metamorphosis. They are thus good biological models to test evolutionary hypotheses predicting ontogenetic pathway switching in unfavourable and stressful environments. They are also interesting targets to understand their maintenance in a large range of habitats. Our aim was then to examine the effect of food level on growth and metamorphosis of paedomorphic Alpine newts Triturus alpestris apuanus (Amphibia, Salamandridae) in an experimental replicated design. Paedomorphs metamorphosed later in treatments with food as a non-limiting factor than in stressful treatments where food was limited. Timing of metamorphosis did not differ between males and females. Food level greatly affected growth rates. These results confirm and extend optimality models that predict paedomorphosis under advantageous aquatic conditions (paedomorph advantage hypothesis) and metamorphosis in stressful aquatic habitats. [less ▲]

List demarcation and false memories

Poster (2001)

Identification of several environmental odours with tin oxide sensor array : three years later

Poster (2001)

The paper discusses the ability of recognition models to classify malodours in the environment three years after their calibration, with the same sources releasing odours. Two methodologies applicable ... [more ▼]

The paper discusses the ability of recognition models to classify malodours in the environment three years after their calibration, with the same sources releasing odours. Two methodologies applicable either in the lab or in the field are used. The effect of the long term drift of the sensors is highlighted on the results of principal component analysis and of discriminant function analysis. The paper examines also the applicability of some drift counteraction methods proposed in the literature. Handled with some care, a correction based on the drift direction in the principal components subspace should be applicable to the classification of real odorous sources in the field. [less ▲]

Determination of the response factors of several desulfoglucosinolates used for quantitative analysis of Brassicaceae

Poster (2001)

Quantitative determination of total and individual glucosinolate contents in Brassica samples (rapeseed/canola, broccoli, cabbage, mustard…) is generally realised according to the reference method ISO ... [more ▼]

Quantitative determination of total and individual glucosinolate contents in Brassica samples (rapeseed/canola, broccoli, cabbage, mustard…) is generally realised according to the reference method ISO 9167-1. After extraction, glucosinolates are purified, then desulfated by Helix pomatia sulfatase. The desulfo-glucosinolates (DSGSL) formed are then separated by reverse phase chromatography associated with UV detection (229 nm). As each compound can possess a very different molar extinction coefficient, it is important - on a quantitative point of view - to define accurately relative response factors. The response factors actually used in the official method have been determined experimentally through indirect methods and have been fixed, some years ago, by consensus between the various laboratories who took part in a ring test. They may need to be revised and calculated for a broader panel of glucosinolates. [less ▲]

Thermal admittance spectroscopy of Mg-doped GaN Schottky diodes

Poster (2001)

Polyphénols du Marrube (Marrubium vulgare L.) et évaluation de l'activité anti-inflammatoire sur Cox-1 et Cox-2.

Poster (2001)

MRI of the normal tarsal joint in dogs

Poster (2001)

Cloning and distribution of steroid receptor coactivator SRC-1 in quail.

Poster (2001)

The Forty-Minute Period of Jupiter's X-ray Polar Emission

Poster (2001)

The observation of Jupiter's x-ray auroral emission during the Cassini Jupiter flyby has brought information of prime interest. The High Resolution Camera onboard the Chandra satellite has a pixel size of ... [more ▼]

The observation of Jupiter's x-ray auroral emission during the Cassini Jupiter flyby has brought information of prime interest. The High Resolution Camera onboard the Chandra satellite has a pixel size of ~.13 arcsec, which makes it possible to discriminate emission features inside the Jovian polar regions. A ten-hour (one full Jovian rotation) light curve of the northern polar cap region (i.e. a region enclosed by System-3 longitude 160-180° and latitude 60-70°) clearly shows a forty-minute oscillation. This oscillation is shown to be independent of the viewing geometry. Such an oscillation is more speculative for the southern polar cap for which the S/N is much lower than in the North. However, if statistically significant, the fluctuation observed in the southern cap may be in close anticorrelation with the northern cap light curve. This would suggest a bouncing motion of the impinging particles, presumably sulfur and oxygen ions, between the polar cap mirror points. Comparison with HST-STIS far ultraviolet (FUV) observations taken during this Jovian rotation allows us to correlate the x-ray emission with a persistent FUV feature mapping to ~30 RJ in the dayside magnetosphere. This feature shows significant local time variations. However, the sampling of the STIS observations does not permit us to highlight a forty-minute oscillation in the corresponding ultraviolet light curve. Previous STIS spectra favor a high FUV color ratio for the polar cap emission, which is consistent with precipitation of high energy sulfur and oxygen ions. [less ▲]

Bubble columns : local gas holdup determination by electrical resistance tomography

Poster (2001)

Anti-inflammatory effects of Centaurea cyanus (Asteraceae) flower-heads.

Poster (2001)

Long-term Effects of Nonsteroidal Antiinflammatory Drugs on Human Chondrocytes in Alginate Beads

Poster (2001)

Diacerein by its Metabolite Rhein, Down-Regulates Stromelysins and Nitric Oxide Productions and Up-Regulates Aggrecan Production by Human Chondrocytes in Alginate Beads

Poster (2001)

Use of molecular tools to enhance antagonistic activity of yeasts against postharvest diseases of apples

Poster (2001)

Marine mammals from the North Sea: Insights in their feeding ecology and nutritional status from stable isotopes ratio and heavy metal concentrations

Poster (2001)

The relationship between trace metal levels, trophic position and health status has been investigated in North Sea marine mammals. Stable isotope ratio (15N and 13C, mass spectrometry) and trace metal ... [more ▼]

The relationship between trace metal levels, trophic position and health status has been investigated in North Sea marine mammals. Stable isotope ratio (15N and 13C, mass spectrometry) and trace metal analyses (Cd, Pb, Cu, Zn, Se, Hg, I.C.P Spectrometry and flameless atomic absorption) have been performed in tissues of 52 harbour porpoises Phocoena phocoena, 27 harbour seals Phoca vitulina, 9 white-beaked dolphins Lagenorhynchus albirostris, 6 grey seals Halichoerus grypus, 1 hooded seal Cystophora cristata, 2 white-sided dolphin Lagenorhynchus acutus, 7 sperm whales Physeter macrocephalus and 4 fin whales Balaenoptera physalus, found stranded on the Northern French, Belgian and Southern Dutch coasts. The lowest 15N value has been measured in fin whales, and the highest in white-beaked dolphins, grey and common seals, suggesting a higher trophic position. Sperm whales, white-sided dolphins and hooded seal have strongly negative 13C values and high renal cadmium levels (258, 88 and 62 µg Cd .g-1dw, respectively) indicating that they might feed, at least in part, on oceanic cephalopods. High Hg liver concentrations can be encountered in older animals and reflect a cumulative storage of detoxified HgSe over the whole life span rather than a bioamplification process. Zn, Cu and Hg concentrations were higher in harbour porpoises from the Southern North Sea compared to other areas. Some individuals were severely emaciated as shown by their muscle atrophy and reduced blubber thickness. Hepatic Zn and Se concentrations were significantly higher in emaciated juvenile porpoises than in normal animals suggesting a severe disturbance of the metal homeostasis. To conclude, within the North Sea, trace metal levels in marine mammals display strong intra- and interspecies variations due to geographic origin, age, diet, trophic position but also by nutritional status of the individuals, raising the question of the suitability of marine mammals as valuable bioindicators of trace metal pollution. [less ▲]

Monitoring Pichia anomala strain K and Candida oleophila strain O, antagonistic yeasts on apple surface

Poster (2001)

Hypothesis Testing in Escherichia coli using Mathematical Modeling

Poster (2001)

Differentiation of Bifidobacterium species by PCR-RFLP

Poster (2001)

An Iron-57 Mössbauer Spectral Study of Na1-xLixMnFe2(PO4)3

Poster (2001)

Détermination de structure et biosynthèse d'alcaloïdes défensifs de Coccinellidae

Poster (2001)

La famille des Coccinellidae est divisée en sept sous-familles et comprend plus de 5200 espèces répandues dans le monde entier. En règle générale, les coccinelles souffrent peu des prédateurs, ce qui peut ... [more ▼]

La famille des Coccinellidae est divisée en sept sous-familles et comprend plus de 5200 espèces répandues dans le monde entier. En règle générale, les coccinelles souffrent peu des prédateurs, ce qui peut être attribué à une vaste gamme de défense (capacité d’envols brusques, camouflage, mimétismes, aposématisme, etc.). Ces insectes disposent également de défenses chimiques : en cas de danger, l’adulte s’immobilise dans une attitude imitant celle d’un individu mort (thanatose) et sécrète des gouttelettes d’hémolymphe au niveau des articulation tibiofémorales de ses pattes par un mécanisme appelé « saignée réflexe ». Chez de nombreuses coccinelles, cet exsudat contient un ou plusieurs alcaloïdes dont l’amertume et la toxicité sont considérés, dans une large mesure, comme une protection vis-à-vis des prédateurs potentiels. Ces alcaloïdes présentent une grande diversité de structures et se rattachent à des squelettes aussi différents que ceux de l’azaphénalène, de l’homotropane ou des azamacrolides. Afin de mieux cerner l’évolution des mécanismes de défense chimique chez ces insectes, nous avons entrepris l’étude du contenu alcaloïdique de Hyperaspis campestris. L’hémolymphe de cette coccinelle contient un alcaloïde nouveau, l’hyperaspine dont la structure a été déterminée sur la base de ses propriétés spectroscopiques. Parallèlement à ces études, nous avons mis au point une méthode de production in vitro de la coccinelline et de l’adaline au moyen de broyats de tissus. Cette technique nous a permis d’explorer de manière plus précise le schéma de biosynthèse de ces molécules, de déterminer l’origine biogénétique de l’atome d’azote ainsi que l’organe responsable de la synthèse des alcaloïdes chez ces insectes. [less ▲]

Species richness: importance for sustainability of grassland ecosystems and impact of heat extremes

Poster (2001)

Abnormal gene expression and assembly of the multimeric complex I in the dum24 deletion mutant of Chlamydomonas reinhardtii

Poster (2001)

Strategy for the development of automated methods using dialysis and trace enrichment as on-line sample preparation techniques for the LC determination of drugs in plasma

Poster (2001)

CE determination of binding constants between profen enantiomers and single-isomer anionic and neutral cyclodextrins.

Poster (2001)

Different techniques to study the conformation of surfactins at interfaces

Poster (2001)

Importance de la phosphorylation de la protéine IE63 du virus de la varicelle et di zona (VZV) sur sa localisation et son activité

Poster (2001)

Elaboration et étalonnage d’une épreuve de rappel indicé à 48 items (RI48) destinée au diagnostic précoce de la maladie d’Alzheimer

Poster (2000, December 08)

New 3-alkylamino-7-chloro-4H-1,2,4-benzothiadiazine 1,1-dioxides related to BPDZ 73 as putative KATP channel openers: design, synthesis and pharmacological evaluation

Poster (2000, December 01)

Prise de décisions liées à la gestion humaine d'entraîneurs de basket-ball en situation de compétition. Etude de cas

Poster (2000, December)

This study is focused on the team management by two basketball coaches of two different levels: one team competing at the highest national level and one team of a local serie. In both cases, reserachers ... [more ▼]

This study is focused on the team management by two basketball coaches of two different levels: one team competing at the highest national level and one team of a local serie. In both cases, reserachers analyzed decisions dealing with the choice of the starting team as well as substitutions during the match. Their perception by the players have been also considered. [less ▲]

Analyse des interactions verbales dont les joueurs se souviennent à l'issue d'une rencontre de sport collectif

Poster (2000, December)

The goals of the study were : (1) to determine if team sport players are able to recall verbal interventions provided by the coach during the match; (2) to analyze the characteristics of those that are ... [more ▼]

The goals of the study were : (1) to determine if team sport players are able to recall verbal interventions provided by the coach during the match; (2) to analyze the characteristics of those that are well recalled. We followed one volleyball team and one basketball team during the 1998-1999 season. Both teams competed in the second Belgian division and belonged to the best clubs of the region of Liege. Data were collected during four matches. Players were interviewed after each match in order to collect their opinions about the interventions emitted by the coach. [less ▲]

Analyse des rituels d'athlètes belges francophones en période pré-compétitive

Poster (2000, December)

Athletes provide a particular attention to supersticious behaviours, specifically when approaching a competition. In this study, we worked with 16 athletes (track and field). During the month before one ... [more ▼]

Athletes provide a particular attention to supersticious behaviours, specifically when approaching a competition. In this study, we worked with 16 athletes (track and field). During the month before one important competition, ten wrote in a diary their daily activities and thoughts. Moreover, during the 10 minutes preceeding the competition, 9 runners have been videotaped in the perspective to participate into a explicitation interview. The data were used to reconstruct their action on the basis of the analysis of the "course of action". [less ▲]

Limit Cycle Oscillation Control

Poster (2000, December)

Over the last fifteen years the Aerospace industry has started to show a continuously increasing interest in the investigation of the vibrations of aircraft subjected to nonlinear structural and ... [more ▼]

Over the last fifteen years the Aerospace industry has started to show a continuously increasing interest in the investigation of the vibrations of aircraft subjected to nonlinear structural and aerodynamic forces. Here, a control scheme designed to alleviate or even stop some types of nonlinear aircraft vibrations is presented. [less ▲]

Solubility of p-hydroxybenzoic esters in supercritical carbon dioxide

Poster (2000, December)

Prevention of neonatal group B streptococcal disease in Belgium: hospital policy, obstetricians' practice and laboratory processing

Poster (2000, November 25)

Pharmacological evaluation of 4,6-disubstituted 2,2-dimethylchromans structurally related to the KATP channel opener cromakalim

Poster (2000, November 18)

Urinary excretion of high Mr PEG (>4000 Da) in rats

Poster (2000, November 18)

Projet de développement d'un système de relevé numérique des documents archéologiques en trois dimensions par des procédés optoélectroniques

Poster (2000, November)