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See detailKepler Detected Gravity-Mode Period Spacings in a Red Giant Star
Beck, P. G.; Bedding, T. R.; Mosser, B. et al

in Science (2011), 332

Stellar interiors are inaccessible through direct observations. For this reason, helioseismologists made use of the Sun’s acoustic oscillation modes to tune models of its structure. The quest to detect ... [more ▼]

Stellar interiors are inaccessible through direct observations. For this reason, helioseismologists made use of the Sun’s acoustic oscillation modes to tune models of its structure. The quest to detect modes that probe the solar core has been ongoing for decades. We report the detection of mixed modes penetrating all the way to the core of an evolved star from 320 days of observations with the Kepler satellite. The period spacings of these mixed modes are directly dependent on the density gradient between the core region and the convective envelope. [less ▲]

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See detailKepler observations of the beaming binary KPD 1946+4340
Bloemen, S.; Marsh, T. R.; Ostensen, R. H. et al

in Monthly Notices of the Royal Astronomical Society (2011), 410

The Kepler Mission has acquired 33.5 d of continuous 1-min photometry of KPD 1946+4340, a short-period binary system that consists of a subdwarf B star (sdB) and a white dwarf. In the light curve ... [more ▼]

The Kepler Mission has acquired 33.5 d of continuous 1-min photometry of KPD 1946+4340, a short-period binary system that consists of a subdwarf B star (sdB) and a white dwarf. In the light curve, eclipses are clearly seen, with the deepest occurring when the compact white dwarf crosses the disc of the sdB (0.4 per cent) and the more shallow ones (0.1 per cent) when the sdB eclipses the white dwarf. As expected, the sdB is deformed by the gravitational field of the white dwarf, which produces an ellipsoidal modulation of the light curve. Spectacularly, a very strong Doppler beaming (also known as Doppler boosting) effect is also clearly evident at the 0.1 per cent level. This originates from the sdB's orbital velocity, which we measure to be 164.0 ± 1.9 km s-1 from supporting spectroscopy. We present light-curve models that account for all these effects, as well as gravitational lensing, which decreases the apparent radius of the white dwarf by about 6 per cent, when it eclipses the sdB. We derive system parameters and uncertainties from the light curve using Markov chain Monte Carlo simulations. Adopting a theoretical white dwarf mass-radius relation, the mass of the subdwarf is found to be 0.47 ± 0.03 Msun and the mass of the white dwarf 0.59 ± 0.02 Msun. The effective temperature of the white dwarf is 15 900 ± 300 K. With a spectroscopic effective temperature of Teff= 34 730 ± 250 K and a surface gravity of log g= 5.43 ± 0.04, the subdwarf has most likely exhausted its core helium, and is in a shell He burning stage. The detection of Doppler beaming in Kepler light curves potentially allows one to measure radial velocities without the need of spectroscopic data. For the first time, a photometrically observed Doppler beaming amplitude is compared to a spectroscopically established value. The sdB's radial velocity amplitude derived from the photometry (168 ± 4 km s-1) is in perfect agreement with the spectroscopic value. After subtracting our best model for the orbital effects, we searched the residuals for stellar oscillations but did not find any significant pulsation frequencies. [less ▲]

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See detailKepler observations of the variability in B-type stars
Balona, L. A.; Pigulski, A.; Cat, P De et al

in Monthly Notices of the Royal Astronomical Society (2011), 413

The analysis of the light curves of 48 B-type stars observed by Kepler is presented. Among these are 15 pulsating stars, all of which show low frequencies, characteristic of slowly pulsating B (SPB) stars ... [more ▼]

The analysis of the light curves of 48 B-type stars observed by Kepler is presented. Among these are 15 pulsating stars, all of which show low frequencies, characteristic of slowly pulsating B (SPB) stars. Seven of these stars also show a few weak, isolated high frequencies and they could be considered as SPB/β Cephei (β Cep) hybrids. In all cases, the frequency spectra are quite different from what is seen from ground-based observations. We suggest that this is because most of the low frequencies are modes of high degree which are predicted to be unstable in models of mid-B stars. We find that there are non-pulsating stars within the β Cep and SPB instability strips. Apart from the pulsating stars, we can identify stars with frequency groupings similar to what is seen in Be stars but which are not Be stars. The origin of the groupings is not clear, but may be related to rotation. We find periodic variations in other stars which we attribute to proximity effects in binary systems or possibly rotational modulation. We find no evidence for pulsating stars between the cool edge of the SPB and the hot edge of the δ Sct instability strips. None of the stars shows the broad features which can be attributed to stochastically excited modes as recently proposed. Among our sample of B stars are two chemically peculiar stars, one of which is a HgMn star showing rotational modulation in the light curve. [less ▲]

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See detailKepler observations: Light shed on the hybrid γ Doradus - δ Scuti pulsation phenomenon
Grigahcène, A.; Uytterhoeven, K.; Antoci, V. et al

in Astronomische Nachrichten (2010), 331

Through the observational study of stellar pulsations, the internal structure of stars can be probed and theoretical models can be tested. The main sequence γ Doradus (Dor) and δ Scuti (Sct) stars with ... [more ▼]

Through the observational study of stellar pulsations, the internal structure of stars can be probed and theoretical models can be tested. The main sequence γ Doradus (Dor) and δ Scuti (Sct) stars with masses 1.2-2.5 M[SUB]ȯ[/SUB] are particularly interesting for asteroseismic study. The γ Dor stars pulsate in high-order gravity (g) modes, with pulsational periods of order of one day. The δ Sct stars, on the other hand, show low-order g and pressure (p) modes with periods of order of 2 hours. Theory predicts the existence of `hybrid' stars, i.e. stars pulsating in both types of modes, in an overlap region between the instability strips of γ Dor and δ Sct stars in the Hertzsprung-Russell diagram. Hybrid stars are particularly interesting as the two types of modes probe different regions of the stellar interior and hence provide complementary model constraints. Before the advent of Kepler, only a few hybrid stars had been confirmed. The {{Kepler}} satellite is providing a true revolution in the study of and search for hybrid stars. Analysis of the first 50 days of {{Kepler}} data of hundreds of γ Dor and δ Sct candidates reveals extremely rich frequency spectra, with most stars showing frequencies in both the δ Sct and γ Dor frequency range. As these results show that there are practically no pure δ Sct or γ Dor pulsators, a new observational classification scheme is proposed by \cite{Grig10}. We present their results and characterize 234 stars in terms of δ Sct, γ Dor, δ Sct/γ Dor or γ Dor/δ Sct hybrids. [less ▲]

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See detailKêpoi. De la religion à la philosophie. Mélanges offerts à André Motte
Pirenne-Delforge, Vinciane ULg; Delruelle, Edouard ULg

Book published by Centre International d'Etude de la Religion Grecque Antique (2001)

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See detailKeratinocyte injury in drug-induced toxic epidermal necrolysis: Simultaneous but distinct topographic expression of CD95R and calprotectin.
Paquet, Philippe ULg; Pierard, Gérald ULg

in International Journal of Molecular Medicine (2002), 10(2), 145-7

Keratinocyte injury in drug-induced toxic epidermal necrolysis (TEN) is attributed to a dysregulation in the complex apoptotic machinery. This study was performed to investigate some aspects of the ... [more ▼]

Keratinocyte injury in drug-induced toxic epidermal necrolysis (TEN) is attributed to a dysregulation in the complex apoptotic machinery. This study was performed to investigate some aspects of the apoptotic pathomechanism involving calprotectin and the CD95 receptor (CD95R, FasR) in TEN. The expression of these two molecules corresponds to calcium-dependent and calcium-independent processes, respectively. Biopsies were collected from blistering skin in 21 TEN patients and from clinically uninvolved skin in 16 of these patients. Immunohistochemistry was performed using specific antibodies directed to CD95R and calprotectin. Half (8/16) of the biopsy specimens taken from clinically uninvolved sites showed the expression of calprotectin throughout the epidermis or restricted to the suprabasal layers. In these samples, a strong CD95R immunoreactivity was often restricted to the basal layer (8/16). Calprotectin was present in all biopsies of bullous skin, especially in suprabasal layers (15/21) or throughout the epidermis (6/21). By contrast, the prominent expression of CD95R was confined almost exclusively to the basal layer (15/21), and more rarely throughout the epidermis (2/21), and it remained sometimes unexpressed (4/21). A clear-cut boundary was often present between the areas labeled by the two antibodies with exceptional overlap between them. The simultaneous expression of calprotectin and CD95R in TEN at distinct levels of the epidermis indicates that the pathomechanism leading to keratinocyte death does not belong to a single process in TEN. Their expression in clinically uninvolved skin suggests that these processes are early and widespread events in TEN. [less ▲]

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See detailKeratinocyte-restricted RabGEF-1 expression is a key regulator of skin homeostasis in vivo
Marichal, Thomas ULg; Reber, Laurent; Tam, See Ying et al

in Proceedings of Stanford Pathology Retreat (2012, June)

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See detailLes kératomes: lésions et traitements chez 19 chevaux
Salciccia, Alexandra ULg; de la Rebière de Pouyade, Geoffroy ULg; Bolen, Géraldine ULg et al

Conference (2012, October 12)

Introduction: Les kératomes, masses hyperplasiques de kératine, croissent entre la phalange distale (P3) et la paroi du sabot et provoquent des boiteries chez le cheval. La littérature comporte de ... [more ▼]

Introduction: Les kératomes, masses hyperplasiques de kératine, croissent entre la phalange distale (P3) et la paroi du sabot et provoquent des boiteries chez le cheval. La littérature comporte de nombreux rapports de cas isolés mais peu de séries cliniques. Matériel et méthodes: Les dossiers cliniques des cas de kératomes présentés depuis 2004 à la faculté de médecine vétérinaire de Liège ont été revus. Résultats: Vingt-trois kératomes ont été diagnostiqués sur 19 chevaux boiteux. Un cheval présentait 2 kératomes sur le même pied et 3 chevaux présentaient 2 kératomes sur des pieds différents. Sur les 22 pieds atteints, les lésions observées étaient: un abcès, souvent récidivant (18 cas), une déformation de la muraille (6 cas), une déviation de la ligne blanche (6 cas) et une seime (3 cas). Un kératome était situé sous la sole et 22 sous la muraille. La durée des symptômes variait de 2 semaines à 15 ans (plus d'un an sur 12 pieds). Sur les radiographies, une lyse par compression de P3 était visible en regard de 20 kératomes. Le cheval présentant 2 kératomes sur le même pied a été euthanasié. Trois kératomes ont été traités de manière conservative. Dix-huit kératomes (chez 16 chevaux) ont été excisés chirurgicalement dont 16 par avulsion complète de muraille, 1 par avulsion partielle de muraille et 1 par curetage d'une portion de sole. Aucune complication postopératoire n'a été observée dans 7/18 cas (39%). Les complications rencontrées étaient: une granulation excessive (10 cas), une douleur importante pendant plusieurs jours (5 cas), une légère infection (4 cas), un enfoncement de P3 en regard de la zone avulsée (2 cas) et une récidive (2 cas, dont 1 a été réopéré avec succès ultérieurement). Un cheval est encore en convalescence au moment de cette étude. Le suivi à long terme d’un cheval a été perdu. Des 14 chevaux repris dans l'évaluation postopératoire, 1 a été euthanasié pour une autre raison que le kératome, 3 chevaux ont gardé une boiterie résiduelle au trot et 10 chevaux ont récupéré leur niveau d'activité. Discussion: La littérature décrit les kératomes comme rares1. Or, 21% des chevaux de cette étude (4 chevaux sur 19) présentaient plusieurs kératomes. De plus, dans 54 % des cas, les symptômes duraient depuis plus d’un an. Dès lors, il apparait que les kératomes sont sous diagnostiqués ou le sont souvent tardivement. La chronicité et l’étendue des kératomes de cette étude n’a que très rarement permis leur résection par avulsion partielle de muraille, technique de choix dont les complications postopératoires sont moindres². Un diagnostic précoce par inspection minutieuse des sabots, particulièrement en cas d’abcès de pied récidivant permettrait une excision par une technique moins invasive, qui diminuerait la convalescence et les complications postopératoires. Bibliographie: 1. Sundberg, J.P. et al. Neoplasms of Equidae. Journal of American veterinary medical association, 1977, 170: 150-152. 2. Boys Smith SJ. et al. Complete and partial hoof wall resection for keratoma removal: postoperative complications and final outcome in 26 horses (1994-2004). Equine Veterinary Journal, 2006, 38 (2): 127-133. [less ▲]

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See detailLa keratose actinique au diapason de la photocarcinogenese en champs. Un concept revisite.
QUATRESOOZ, Pascale ULg; PAQUET, Philippe ULg; PIERARD, Gérald ULg

in Revue Médicale de Liège (2010), 65(11), 619-22

Actinic keratosis should no more be considered as a single neoplasm calling for an individual treatment. The concept of actinic photocarcinogenesis presently turns upside down the perception of skin ... [more ▼]

Actinic keratosis should no more be considered as a single neoplasm calling for an individual treatment. The concept of actinic photocarcinogenesis presently turns upside down the perception of skin cancers induced by nonionizing electromagnetic radiations. Currently, the clinician should cope with the whole skin area that has been damaged by chronic exposures to the visible and the invisible spectrum of the light. The therapeutic archetypes are 5-fluorouracile 5% and imiquimod 5% carefully applied to the skin area. [less ▲]

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See detailKératoses actiniques sous la loupe.
PIERARD, Gérald ULg; BASSET-SEGUIN, N.; HENGGE, U. et al

Book published by Publ. Artoos (2009)

Actinic keratoses are common lesions caused by the cumulative action of the sun’s rays on the skin of predisposed individuals. They generally develop in seniors, but they may be earlier in those who have ... [more ▼]

Actinic keratoses are common lesions caused by the cumulative action of the sun’s rays on the skin of predisposed individuals. They generally develop in seniors, but they may be earlier in those who have an occupational activity outside or who spend a lot of spare time under the sun. The depletion of the ozone layer might also be involved. [less ▲]

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See detailDe kerk van Christus bij de keerpunten der geschiedenis
Kurth, Godefroid ULg; Ruyter, J.

Book published by Claessens - 2e éd. (1904)

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See detailKernelizing the output of tree-based methods
Geurts, Pierre ULg; Wehenkel, Louis ULg; d Alché-Buc, Florence

in Proceedings of the 23rd International Conference on Machine Learning (2006)

We extend tree-based methods to the prediction of structured outputs using a kernelization of the algorithm that allows one to grow trees as soon as a kernel can be defined on the output space. The ... [more ▼]

We extend tree-based methods to the prediction of structured outputs using a kernelization of the algorithm that allows one to grow trees as soon as a kernel can be defined on the output space. The resulting algorithm, called output kernel trees (OK3), generalizes classification and regression trees as well as tree-based ensemble methods in a principled way. It inherits several features of these methods such as interpretability, robustness to irrelevant variables, and input scalability. When only the Gram matrix over the outputs of the learning sample is given, it learns the output kernel as a function of inputs. We show that the proposed algorithm works well on an image reconstruction task and on a biological network inference problem. [less ▲]

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See detailkerogen
Javaux, Emmanuelle ULg

in Gargaud et al (Ed.) Encyclopedia of Astrobiology (2011)

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See detailKết quả bước đầu đánh giá khả năng sinh trưởng của lợn Pietrain kháng stress nuôi tại Hải Phòng (Việt Nam)
Do Duc, Luc ULg; Bui Van, Dinh; Nguyen Hoang, Thinh et al

in Journal of Agricultural Science and Developement - Hanoi University of Agriculture, Vietnam (2008), 6(6), 549-555

The present study was carried out on 19 stress negative Piétrain pigs (Pietrain ReHal), consisting of 13 gilts and 6 young boars imported from Belgium, raised in the livestock farm of Dong Hiep (Hai Phong ... [more ▼]

The present study was carried out on 19 stress negative Piétrain pigs (Pietrain ReHal), consisting of 13 gilts and 6 young boars imported from Belgium, raised in the livestock farm of Dong Hiep (Hai Phong) in order to evaluate growth performances and their adaptability in the North of Vietnam. Results showed that the average body weight of the whole herd at 2, 4, 5.5, and 8.5 months old was 19.05, 51.05, 85.82, and 119.47 kg, respectively. During the growing periods, except the first stage, the male grew faster than the female and the pigs of the CT genotype grew faster than those of CC genotype although the difference was not significant (P>0.05). The average daily gain (ADG) was 528.56 grams for the whole herd. The ADG was higher for the male (546.48 grams) than for the female (520.29 grams), and its was higher for the CT than the CC, but the difference was not statistically significant (P>0.05). The feed conversion ratio (FCR) was 2.69 kg. The estimated lean percentage at 8.5 months old was 64.08%. The results indicate that Piétrain stress negative pigs could develop well on the farm conditions in Hai Phong, Vietnam. [less ▲]

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See detailthe ketogenic diet in infants
Battisti, Oreste ULg; Debray, François-Guillaume ULg

Learning material (2008)

this presentation makes the point on fundamental and practical points about the use of ketogenic diet in infants

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See detailKetoprofen and Phenylbutazone Attenuation of PAF-Induced Lung Inflammation in Calves
Van de Weerdt, ML; Coghe, Joost; Uystepruyst, Christophe et al

in Veterinary Journal (1999), 157(1), 39-49

The purposes of this study were: (1) to investigate which arachidonic acid metabolites contributed to platelet-activating factor (PAF) induced pulmonary dysfunction; and (2) to compare the effect of two ... [more ▼]

The purposes of this study were: (1) to investigate which arachidonic acid metabolites contributed to platelet-activating factor (PAF) induced pulmonary dysfunction; and (2) to compare the effect of two non-steroidal anti-inflammatory drugs, phenylbutazone and ketoprofen in a model of PAF-induced reversible lung inflammation in six calves. In placebo and phenylbutazone groups, PAF infusion induced significant dysfunctions in the pattern of breathing, mechanics of breathing and gas exchange. These dysfunctions were prevented by ketoprofen pretreatment, except for the mechanics of breathing which was moderately but significantly altered by the PAF challenge. In all calves, leukotriene (LT) B4 plasma concentrations did not significantly increase above baseline values at any time. Prostaglandin (PG) E2 plasma concentrations showed a minor significant increase in phenylbutazone pretreated calves (55.8 +/- 25.8 pg/mL from 36.7 +/- 16.13 pg/mL). Thromboxane (TX) B2 plasma concentration was significantly increased during PAF challenge in placebo- and phenylbutazone-pretreated groups, but not in ketoprofen-pretreated calves (1580.0 +/- 1370 from 42.7 +/- 10.7 pg/mL; 2340 +/- 477 from 63 +/- 32 pg/mL; and 36.5 +/- 4.12 from 39.3 +/- 12.0 pg/mL, respectively). These data suggest that TXA2 is an important cyclooxygenase metabolite of arachidonic acid produced in response to PAF and that ketoprofen (intramuscular injection, 3 mg/kg) is more effective than phenylbutazone (intramuscular injection, 10 mg/kg) in preventing respiratory dysfunctions induced by the PAF challenge 30 min after drug administration. Ketoprofen did not suppress totally the PAF-induced changes in mechanics of breathing, which suggests that PAF or a secondary release of mediators could have a direct action on airway smooth muscle. [less ▲]

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See detailKey criteria for the design of polymeric stabilizers for aqueous titanium dioxide dispersions of high solid content
Creutz, Serge; Jérôme, Robert ULg

in e-Polymers (2001), (14), 1-9

Amphiphilic copolymers consisting of an animated hydrophobic block and a hydrophilic poly(sodium methacrylate) one have been synthesized with different structures and tested as stabilizers for aqueous ... [more ▼]

Amphiphilic copolymers consisting of an animated hydrophobic block and a hydrophilic poly(sodium methacrylate) one have been synthesized with different structures and tested as stabilizers for aqueous dispersions of alumina coated titanium dioxide (80 wt.-% solid). The dispersion stability is ruled by the strength of the anchoring of the aminated block onto the pigment and by the dynamics of the micelles formed by the copolymer. Any decrease in the anchoring strength, for example as a result of higher steric hindrance for the adsorbing block or of random rather than blocky distribution of the aminated co-units, is detrimental to the dispersion stability and makes this stability more dependent on the copolymer composition. Indeed, the position and dynamics of the unimers micelles equilibrium then control the adsorption of the copolymer on the pigment during the grinding process. [less ▲]

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See detailKey Issues for a Work Program to Implement Article 6 of the United Nations Framework Convention on Climate Change
van Ypersele, Jean-Pascal; Semal, Nathalie ULg

Speech (2002)

This allocution aimed to contribute to: • the defining of recommendations to make for the elaboration of a SBSTA work program for the development of Article 6 of the FCCC; • the analysis and discussion of ... [more ▼]

This allocution aimed to contribute to: • the defining of recommendations to make for the elaboration of a SBSTA work program for the development of Article 6 of the FCCC; • the analysis and discussion of strategies that promote the development of programs for education, training and public awareness on climate change, with a special emphasis on capacity building; • the identification of useful initiatives that facilitate the coordination of measures taken regarding climate change, in order to avoid the useless repetition of similar efforts and to make the most of combined actions. [less ▲]

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