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See detailPhysics of badminton shuttlecock. Part 2 : Turn around
Darbois-Texier, Baptiste ULg; Cohen, Caroline; Quéré, David et al

Conference (2011, November 22)

We study experimentally shuttlecocks dynamics. In this part we show how the shuttlecock shape is optimized for badminton play. The shuttlecock always flies the nose forehead. After the impact it has thus ... [more ▼]

We study experimentally shuttlecocks dynamics. In this part we show how the shuttlecock shape is optimized for badminton play. The shuttlecock always flies the nose forehead. After the impact it has thus to return. Actually it returns, oscillates and then stabilizes. We try to understand these damping oscillations and draw an analogy with the dandelions achenes and parachutists. [less ▲]

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See detailPhysics of badminton shuttlecocks. Part 1 : aerodynamics
Cohen, Caroline; Darbois-Texier, Baptiste ULg; Quéré, David et al

Conference (2011, November 22)

We study experimentally shuttlecocks dynamics. In this part we show that shuttlecock trajectory is highly different from classical parabola. When one takes into account the aerodynamic drag, the flight of ... [more ▼]

We study experimentally shuttlecocks dynamics. In this part we show that shuttlecock trajectory is highly different from classical parabola. When one takes into account the aerodynamic drag, the flight of the shuttlecock quickly curves downwards and almost reaches a vertical asymptote. We solve the equation of motion with gravity and drag at high Reynolds number and find an analytical expression of the reach. At high velocity, this reach does not depend on velocity anymore. Even if you develop your muscles you will not manage to launch the shuttlecock very far because of the ``aerodynamic wall.'' As a consequence you can predict the length of the field. We then discuss the extend of the aerodynamic wall to other projectiles like sports balls and its importance. [less ▲]

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See detailThe Physics of Pulsating White Dwarf Stars
Fontaine, G.; Brassard, P.; Charpinet, S. et al

in Astronomical Society of the Pacific Conference Series (2012, September), 462

We present a summary of the properties of white dwarf stars, beginning with a brief reminder of their basic characteristics. We continue with a discussion of the spectral types, evolution, and other ... [more ▼]

We present a summary of the properties of white dwarf stars, beginning with a brief reminder of their basic characteristics. We continue with a discussion of the spectral types, evolution, and other properties of cooling white dwarfs, with an emphasis on the internal physics. We then introduce the pulsating white dwarfs and provide an updated view of their status. We finally discuss the impact (real and potential) of asteroseismology on our knowledge of degenerate stars. [less ▲]

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See detailPhysics of the Galaxy and Interstellar Matter -- H. Scheffler et H. Elsässer
Manfroid, Jean ULg

in Ciel et Terre (1988), 104

Not Available

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See detailPhysics of the Stars -- A. Slettebak et T. P. Snow
Manfroid, Jean ULg

in Ciel et Terre (1988), 104

Not Available

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See detailPhysio-chemical characterization of cytosol and nuclear mineralocorticoid receptors in rat kidney
Palem, M.; Hacha, R.; Saint-Remy, Annie ULg et al

in Journal of Steroid Biochemistry (1982), 16

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See detailLa physiognomonie au XIXe siècle. Transpositions esthétiques et médiatiques
Stienon, Valérie ULg; Wicky, Érika

Book published by revue Etudes Françaises (2013)

Dès les premières traductions françaises des traités de Johann Kaspar Lavater à la fin du XVIIIe siècle, la physiognomonie a pris une place prépondérante dans l’iconographie et la pensée de l’époque. Très ... [more ▼]

Dès les premières traductions françaises des traités de Johann Kaspar Lavater à la fin du XVIIIe siècle, la physiognomonie a pris une place prépondérante dans l’iconographie et la pensée de l’époque. Très tôt renforcée par la diffusion des traités de phrénologie de Franz Josef Gall, cette théorie paramédicale a suscité une émulation telle qu’elle a contribué à poser les bases de la morphopsychologie, qu’elle a participé au développement de l’anthropométrie et s’est ramifiée en d’innombrables branches parmi lesquelles figurent la physiognomonie zoologique, la physiognomonie ethnologique ou encore la « pathognomonie ». En outre, reposant sur la conviction qu’il est possible d’atteindre les profondeurs de l’intériorité humaine par l’observation d’éléments conçus comme autant de signes à déchiffrer, cette théorie relève du raisonnement par induction qui a pris, dans la fiction littéraire, la forme spécifique d’une recherche d’indices et a participé, dans les disciplines médicales, à la méthode diagnostique. Le postulat selon lequel une connaissance de l’être humain est possible par l’observation minutieuse de ses traits extérieurs – conviction renforcée, à la moitié du siècle, par les possibilités techniques de la photographie – a contribué à enrichir la description, à affiner l’art du portrait et à aiguiser le trait incisif de la caricature. Ayant offert de riches moyens cognitifs et esthétiques d’exploration du monde social au peintre, à l’illustrateur, à l’homme de lettres et à l’historien, ces théories paramédicales ont durablement marqué l’histoire des conceptions et des représentations sociales. Envisager l’influence de la physiognomonie en termes de diffusion d’un paradigme scientifique permettra de saisir les modalités et de mesurer les enjeux non seulement de la transposition de ce paradigme d’un médium à un autre, mais aussi de sa circulation entre différentes aires géographiques, disciplinaires ou sociales. L’étude des vecteurs suivant lesquels la physiognomonie investit les représentations fera intervenir des corpus variés, issus de contextes culturels allant de la France romantique à la blogosphère actuelle en passant par l’Allemagne nazie de l’entre-deux-guerres. À l’observation attentive des sources primaires (documents historiques, traités médicaux, gravures d’époque, œuvres picturales, textes littéraires), s’ajoutera une réflexion sur la postérité de ces développements théoriques par l’analyse des discours distanciés, dubitatifs, voire explicitement critiques à leur égard, et ce dès leur toute première diffusion. Ce dossier propose une réflexion susceptible d’apporter des éléments de réponse à la double question suivante : de quelle postérité épistémique le modèle d’interprétation et de représentation hérité de la physiognomonie bénéficie-t-il, entre dépréciation et application effective, à partir de la seconde moitié du XIXe siècle ? Comment cette influence s’est-elle répandue ? [less ▲]

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See detailPhysiologic Response to Dobutamine Infusion During Cardiac Stress Testing of Dogs
Mc Entee, Kathleen ULg; Amory, Hélène ULg; Clercx, Cécile ULg et al

in American Journal of Veterinary Research (1998), 59(9), 1160-5

OBJECTIVE: To evaluate response of various cardiovascular variables after administration of incremental doses of dobutamine in healthy conscious dogs, using standardized dobutamine stress echocardiography ... [more ▼]

OBJECTIVE: To evaluate response of various cardiovascular variables after administration of incremental doses of dobutamine in healthy conscious dogs, using standardized dobutamine stress echocardiography (DSE). ANIMALS: 8 healthy dogs. PROCEDURE: A DSE was performed twice on each dog within 24 hours. Dobutamine was infused at a rate of 12.5 to 42.5 microg/kg/min, using incremental increases of 10 microg/kg/min. Doppler sphygmomanometry, electrocardiography, and echocardiography were performed. Left ventricular size, global ventricular performance, and left ventricular systolic myocardial function were measured by means of echocardiography. RESULTS: At the highest dosage, dobutamine induced an increase of 20+/-3% and 109+/-12% in systolic blood pressure and cardiac index, respectively. The latter was associated with a significant increase in heart rate and stroke index. Fractional shortening of the left ventricle, fractional thickening of the left ventricular free wall and interventricular septum, ejection fraction, and mean velocity of fiber shortening had a progressive and significant increase during dobutamine infusion. Preejection period and left ventricular ejection time had a progressive and significative decrease during the stress test. CONCLUSIONS: The technique used was feasable, safe, and repeatable in healthy conscious dogs. Control values were determined. CLINICAL RELEVANCE: Data for these healthy dogs might be useful for comparison with results obtained from dogs with known or suspected cardiovascular disease. [less ▲]

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See detailPhysiological adjustments to exercise in COPD horses
Art, Tatiana ULg; Lekeux, Pierre ULg

in Handbook and Abstract Booklet of 5th ICEEP (1998)

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See detailPhysiological analysis of the floral transition
Bernier, Georges ULg; Corbesier, Laurent; Périlleux, Claire ULg et al

in Cockshull, K. E.; Gray, D.; Seymour, G. B. (Eds.) et al Genetic and Environmental Manipulation of Horticultural Crops (1998)

This chapter summarizes the changes in contents of the phloem sap that were found at the time of floral induction in different photoperiodic species: Arabidopsis thaliana, Sinapis alba, Lolium temulentum ... [more ▼]

This chapter summarizes the changes in contents of the phloem sap that were found at the time of floral induction in different photoperiodic species: Arabidopsis thaliana, Sinapis alba, Lolium temulentum and Xanthium strumarium. Changes affecting contents in carbohydrates, cytokinins, amino acids, polyamines and inorganis ions are discussed in the context of 'florigen quest'. [less ▲]

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See detailPhysiological and bio-functional properties of gum arabic: a notable interest for certain human diseases
Eloundou Mballa, Pierre; Goffin, Dorothée ULg; Destain, Jacqueline ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (in press)

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See detailPhysiological and perceptual responses to cyclic heat stress variations
Mairiaux, Philippe ULg; Libert, J. P.; Candas, V. et al

in Aviation, Space and Environmental Medicine (1984), 55(10), 935-40

The effect of the time presentation of a given external heat load was examined on five subjects exercising at a constant work load (50 W). The subjects, dressed in briefs, were exposed to cyclic ... [more ▼]

The effect of the time presentation of a given external heat load was examined on five subjects exercising at a constant work load (50 W). The subjects, dressed in briefs, were exposed to cyclic variations for 120 min in air temperatures between 51 degrees C and 23 degrees C, under three different schedules involving heat pulses of 10-min, 20-min and 30-min duration, respectively. The strain induced by each of these conditions was compared in terms of both physiological and perceptual criteria. Results showed that between conditions, there were significant differences in skin temperature levels but not in core temperature levels, body heat storage, or body weight loss. Perception of effort and thermal sensation ratings both exhibited similar changes in all three conditions. Due to the time constant of the sweating response, sweating rates and skin wettednesses at the end of the heat pulses were lower for 10-min heat pulses than for those of 20- and 30-min duration, and these differences were perceived by the subjects. Lower perceived skin wettedness ratings are thus suggested as the main factor to explain why all subjects rated the 10-min heating-cooling cycle as the least strenuous and uncomfortable condition. It is concluded that under the conditions of this study, perceptual criteria associated with physiological criteria represent a useful means of discriminating slight differences in strain. [less ▲]

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See detailPhysiological and physico-chemical factors modulating ISR elicitor production by Pseudomonas putida
Jourdan, Emmanuel ULg; Ongena, MARC ULg; Adam, Akram et al

in Bulletin OILB/SROP = IOBC/WPRS Bulletin (2006), 29(2)

Abstract: A better understanding of biotic and environmental factors that regulate the production of active metabolites by beneficial rhizobacteria is crucial for optimising biocontrol under pratical ... [more ▼]

Abstract: A better understanding of biotic and environmental factors that regulate the production of active metabolites by beneficial rhizobacteria is crucial for optimising biocontrol under pratical conditions. In this study, we wanted to evaluate the effect of some parameters on the production of the plant defence elicitor synthesized by Pseudomonas putida BTP1. This molecule is clearly dependant of the secondary metabolism and chemostat experiments showed that the elicitor is more efficiently produced at a very low cell growth rate. On another hand, the presence of free amino acids in the medium is necessary to obtain an optimal NABD production. A specific positive effect of phenylalanine was evidenced in pulsed continuous cultures suggesting that this residue could play a role as a precursor and/or act as a regulator in the biosynthetic pathway. [less ▲]

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See detailPhysiological and proteomic evidences that domestication process differentially modulates the immune status of juvenile Eurasian perch (Perca fluviatilis) under chronic confinement stress.
Douxfils, J.; Mathieu, Cédric; Mandiki, S. N. et al

in Fish & Shellfish Immunology (2011), 159(1), 92-9

The current study aimed to evaluate the influence of domestication process on the stress response and subsequent immune modulation in Eurasian perch juveniles (Perca fluviatilis) submitted to chronic ... [more ▼]

The current study aimed to evaluate the influence of domestication process on the stress response and subsequent immune modulation in Eurasian perch juveniles (Perca fluviatilis) submitted to chronic confinement. Briefly, F1 and F4 generations were confined into small-size tanks and sampled 7 and 55 days after stocking. Cortisol and glucose levels as well as lysozyme activity and immunoglobulin level were evaluated in the serum. Spleen Somatic Index and spleen ROS production were also measured. A proteomic analysis was performed on serum sampled on day 7. Finally, both generations were genetically characterized using a microsatellite approach. Globally, results revealed that chronic confinement did not elicit a typical stress response but resulted in a prolonged immune stimulation. Proteomic results suggested that domestication process influenced the immune status of perch submitted to chronic confinement as the F1 confined fish displayed lower abundance of C3 complement component, transferrin and Apolipoprotein E. Microsatellite data showed a strong genetic drift as well as reduced genetic diversity, allelic number and heterozygosity along with domestication process. The present work is the first to report that fish under domestication can develop an immune response, assessed by a combined approach, following recurrent challenges imposed by captive environment despite a reduced genetic variation. [less ▲]

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See detailPhysiological and proteomic responses of different willow clones (Salix fragilis x alba) exposed to dredged sediment contaminated by heavy metals
Evlard, Aricia ULg; Sergeant, Kjell; Ferrandis, Salvador et al

in International Journal of Phytoremediation (2014), 16(11), 1148-1169

High biomass producing species are considered as tools for remediation of contaminated soils. Willows (Salix spp.) are prominent study subjects in this regard. In this study, different willow clones ... [more ▼]

High biomass producing species are considered as tools for remediation of contaminated soils. Willows (Salix spp.) are prominent study subjects in this regard. In this study, different willow clones (Salix fragilis x alba) were planted on heavy-metal polluted dredging sludge. A first objective was assessment of the biomass production for these clones. Using a Gupta statistic, four clones were identified as high biomass producers (HBP). For comparison, a group of four clones with lowest biomass production were selected (LBP). A second objective was to compare metal uptake as well as the physiological and proteomic responses of these two groups. All these complementary data's allow us to have a better picture of the health of the clones that would be used in phytoremediation programs. Cd, Zn, and Ni total uptake was higher in the HBPs but Pb total uptake was higher in LBPs. Our proteomic and physiological results showed that the LBPs were able to maintain cellular activity as much as the HBPs although the oxidative stress response was more pronounced in the LBPs. This could be due to the high Pb content found in this group although a combined effect of the other metals cannot be excluded. [less ▲]

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See detailPhysiological characterization of Biofidobacterium for probiotic use.
Majad, L.; Evrard, P.; Thonart, Philippe ULg

Poster (2003, June)

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See detailPhysiological consequences of strenuous concentric and eccentric isokinetic exercises
Croisier, Jean-Louis ULg; Maquet, Didier ULg; Lehance, Cédric ULg et al

in Isokinetics & Exercise Science (2007), 15(1), 51

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See detailPhysiological effects of experimental verminous bronchitis in Friesian calves
Lekeux, Pierre ULg; Hajer, R.; Boon, J. H. et al

in Canadian Journal of Comparative Medicine (Gardenvale, Quebec) (1985), 49(2), 205-207

Pulmonary function values were measured in five Friesian calves of five months of age during the patent phase of an experimental moderate lungworm infection and were compared with the pulmonary function ... [more ▼]

Pulmonary function values were measured in five Friesian calves of five months of age during the patent phase of an experimental moderate lungworm infection and were compared with the pulmonary function values recorded in four control animals. All the nine calves were free of any previous challenge with Dictyocaulus viviparus and were submitted to the same standardized conditions of body conformation, housing, feeding and procedures for pulmonary function testing. A significant increase of respiratory rate, minute ventilation, total pulmonary resistance and power of breathing and a significant decrease of tidal volume, dynamic lung compliance and PaO2 were observed in the infested animals. The absolute intrapleural pressure values were also significantly more negative. The conclusions of the statistical analysis were almost identical when predicted instead of measured pulmonary function values were used in the control group. The clinical, functional and pathological findings in the infested animals were all consistent with the picture of a lower airway obstructive disease. [less ▲]

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