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See detailInfluence of daily regimen calcium and vitamin D supplementation on parathyroid hormone secretion
Reginster, Jean-Yves ULg; Zegels, Brigitte ULg; Lejeune, Emmanuelle ULg et al

in Calcified Tissue International (2002), 70(2), 78-82

Calcium and vitamin D supplementation has been shown to reduce secondary hyperparathyroidism and play a role in the management of senile osteoporosis. In order to define the optimal regimen of calcium and ... [more ▼]

Calcium and vitamin D supplementation has been shown to reduce secondary hyperparathyroidism and play a role in the management of senile osteoporosis. In order to define the optimal regimen of calcium and vitamin D supplementation to produce the maximal inhibition of parathyroid hormone secretion, we have compared the administration of a similar amount of Ca and vitamin D, either as a single morning dose or split in two doses, taken 6 hours apart. Twelve healthy volunteers were assigned to three investigational procedures, at weekly intervals. After a blank control procedure, when they were not exposed to any drug intake, they received two calcium-vitamin D supplement regimens including either two doses of Orocal D3 (500 mg Ca and 400 IU vitamin D) 6 hours apart or one water-soluble effervescent powder pack of Cacit D3 in a single morning dose (1000 mg Ca and 880 IU vitamin D). During the three procedures (control and the two calcium-vitamin D supplementations), venous blood was drawn every 60 minutes for up to 9 hours, for serum Ca and serum PTH measurements. The order of administration of the two Ca and vitamin D supplementation sequences was allocated by randomization. No significant changes in serum Ca were observed during the study. During the 6 hours following Ca and vitamin D supplementation, a statistically significant decrease in serum PTH was observed with both regimens, compared with baseline and with the control procedure. Over this period of time, no differences were observed between the two treatment regimens. However, between the sixth and the ninth hour, serum PTH levels were still significantly decreased compared with baseline with split dose Orocal D3 administration, while they returned to baseline value with the Cacit D3 preparation. During this period, the percentage decrease in serum PTH compared with baseline was significantly more pronounced with Orocal D3 than with Cacit D3 (P = 0.0021). We therefore conclude that the administration of two doses of 500 mg of calcium and 400 IU of vitamin D3 6 hours apart provides a more prolonged decrease in serum PTH levels than the administration of the same total amount of Ca and vitamin D as a single morning dose in young healthy volunteers. This might have implications in terms of protection of the skeleton against secondary hyperparathyroidism and increased bone resorption and turnover in elderly subjects. [less ▲]

Detailed reference viewed: 58 (13 ULg)
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See detailInfluence of depth perception on performance and time evaluation in minimal access surgery
Blavier, Adelaïde ULg; Nyssen, Anne-Sophie ULg

Conference (2005)

This study aimed to evaluate the impact of depth perception on surgical tasks performance and time evaluation. 98 novice subjects performed a fine surgical task with a new laparoscopic technology (da ... [more ▼]

This study aimed to evaluate the impact of depth perception on surgical tasks performance and time evaluation. 98 novice subjects performed a fine surgical task with a new laparoscopic technology (da Vinci robotic system). They were divided in two groups, one using 3D view option and another using 2D view option. We measured time performance and asked subjects to evaluate their time performance. Our results showed subjects performed significantly quicker with robotic system in 3D than with robotic system in 2D. We obtained a significant interaction between time performance and time evaluation: in 2D condition, subjects accurately evaluated their time performance while in 3D condition, subjects evaluated their time performance as being longer than their real performance and even than real or evaluated performances of subjects in 2D condition. Our findings emphasize the role of 3D in improving performance and the contradictory feeling about time evaluation in 2D and 3D. [less ▲]

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See detailInfluence of Diazepam on Contingent Negative Variation
Papart, Patrick ULg; Ansseau, Marc ULg; Timsit-Berthier, M.

in Human Psychopharmacology (1997), 12

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See detailInfluence of diet form (pellets or meal) on the optimal number of weaned pigs per feeding space
Laitat, Martine ULg; Vandenheede, Marc ULg; Desiron, Alain et al

in Journal of Swine Health and Production (2004), 12(6, NOV-DEC), 288-295

Objectives: To assess the influence of group size and diet form on performance and feeding behavior of weaned pigs and to determine an optimal number of pigs per feeding space for pellets or meal provided ... [more ▼]

Objectives: To assess the influence of group size and diet form on performance and feeding behavior of weaned pigs and to determine an optimal number of pigs per feeding space for pellets or meal provided in a tube feeder. Methods: During six consecutive trials, feeding behavior and performance of groups comprising 30 (G30), 40 (G40), or 50 (G50) weaned pigs were compared for 6 weeks after weaning. A tube feeder was used for all groups, delivering either pellets or meal (trough length 64 cm; two integrated drinkers). Results: Mean ADG was 5% higher when pigs were fed pellets rather than meal (P = .06). Whatever the diet, ADG was lower in G50 than in G40 (P < .05). In groups fed meal, ADG was lower in G40 than in G30 (P < .001). Average time using the feeder was 4.7 minutes per hour for pigs fed pellets, and 7.3 minutes per hour for pigs fed meal (P = .003). Overall feeder occupation rates during the day were 139 +/- 30% for meal and 93 +/- 21% for pellets (P = .01), and during the night, 91 +/- 33% for meal and 54 +/- 15% for pellets (P = .03), assuming 100% is four pigs eating simultaneously during the observation period. Implications: Diet form influences the optimal number of pigs per feeder space. For the tube feeders in this study, the recommended maximum number of pigs per feeding space is 6.5 for pigs fed meal and 10.2 for pigs fed pellets. [less ▲]

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See detailInfluence of diet form and feeding equipment on feeding behaviour and performance of weaned pigs
Laitat, Martine ULg

in Annales de Médecine Vétérinaire (2006), 150(Sp. Iss. SI), 36-39

Influence of diet form and feeding equipment on feeding behaviour and performance of weaned pigs

Detailed reference viewed: 27 (6 ULg)
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See detailInfluence of dietary protein source on fattening parameters of Belgian Blue double muscled cows
Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg; de Behr, Vanessa et al

in Book of abstracts of the 53rd Annual Meeting of the European Association for Animal Production (2002)

Detailed reference viewed: 19 (5 ULg)
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See detailInfluence of dietary selenium enrichment on performance and chemical composition of meat in Belgian Blue Bulls
Mehdi, Youcef ULg; Istasse, Louis ULg; Hornick, Jean-Luc ULg et al

in Proceedings of the 2nd Scientific Meeting of the Faculty of Veterinary Medicine (Liège – Belgium) (2012)

Selenium (Se) is a major structural component of various selenoproteins which contain a selenocysteine and a Se atom in their active site (except selenoprotein-P). They play an important role in many ... [more ▼]

Selenium (Se) is a major structural component of various selenoproteins which contain a selenocysteine and a Se atom in their active site (except selenoprotein-P). They play an important role in many functions, such as antioxidant defense and the formation of thyroid hormones. [less ▲]

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See detailInfluence of different Carbohydrate Composition in Barley Varieties on Salmonella Typhimurium var. Copenhagen Colonization in a ’Trojan’ Challenge Model in Pigs
Pieper, Robert; Bindelle, Jérôme ULg; Malik, Gita et al

in Archives of Animal Nutrition (2012)

Based on previously performed in vitro studies, which showed that hulless barley varieties could reduce large intestinal Salmonella Typhimurium var. Copenhagen proliferation in pigs, two in vivo ... [more ▼]

Based on previously performed in vitro studies, which showed that hulless barley varieties could reduce large intestinal Salmonella Typhimurium var. Copenhagen proliferation in pigs, two in vivo experiments were conducted with a total of 252 piglets to prove these observations. In experiment 1, 126 weaning piglets were randomly allocated into pens of seven animals each and fed one of 6 experimental diets. Three diets contained (75% as-fed) one of 3 hulless barley varieties with -glucan (BG) contents ranging from 5-11% and amylose from 5-40%, and two diets contained a low BG and amylose hulless barley supplemented with isolated barley BG or raw potato starch. A hulled barley diet served as a control. Two piglets per pen (’Trojan’ pigs) were orally infected with Salmonella Typhimurium var. Copenhagen (ST). The remaining 5 pigs per pen were designated ’Contact’ pigs. The ST shedding was determined over one week after infection. On day 6, the two trojans and two random contacts from each pen were euthanized and intestinal contents and mesenteric lymph nodes cultured for ST. Intestinal volatile fatty acids and microbial composition were determined. In experiment 2, 126 piglets were assigned to one of 3 diets based on hulled or hulless barleys. The timeline, infection, sampling and analyses were similar as in experiment 1 except samples were taken from 4 contacts pigs. Hulless barley varieties with high BG and amylose tended to decrease ST persistence in experiment 1. Clostridia from cluster I in the colon were reduced with high amylose hulless barley or diets supplemented with potato starch (p<0.05), whereas other microbial groups were not. Propionate increased (p<0.05) and acetate decreased (p<0.05) with hulless barley inclusion. Using more experimental units per barley, experiment 2 revealed a reduced ST shedding and reduced number of clostridia for high BG hulless barley as compared to common hulled barley and a low BG variety (p<0.05). In conclusion, high BG hulless barley do not prevent ST colonization but might help to reduce transmission in pigs, likely by supporting an intestinal environment limiting growth of this zoopathogen. [less ▲]

Detailed reference viewed: 48 (18 ULg)
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See detailInfluence of different exposure conditions to cigarette smoke on the pulmonary acute inflammatory response in mice
Steuve, J.; Cheu, Esteban ULg; Fievez, Laurence ULg et al

in Proceedings: Autumn Meeting of the Belgian Society of Fundamental and Clinical Physiology and Pharmacology (2007)

Detailed reference viewed: 1 (0 ULg)
See detailINFLUENCE OF DIMETHOXYMETHANE (DMM) ADDITION IN LIGHT FUEL OIL ON THE FLAME EMISSION IN A DOMESTIC HOT WATER BOILER
Tartari, Paula; Ngendakumana, Philippe ULg

Conference (2001, September)

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler fitted ... [more ▼]

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler fitted with a burner equipped with a spill-return atomiser. The tests have been performed in steady-state regime without and with DMM addition (4% on mass basis). The two firing rates (low and high firing rates) of the burner have been adjusted successively. The flame emission was recorded by means of a photodiode, sensible in the visible region of the wavelength spectrum. The axial profiles of the flame emission obtained show clearly that an addition of DMM in the fuel oil leads to a decrease in the flame emission and thus a soot reduction. The NOx and CO emissions (measured at the chimney) and the thermal efficiency of the boiler were not significantly affected. [less ▲]

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See detailInfluence of dipole-dipole interactions decoherence-free states
Damanet, François ULg; Martin, John ULg

Poster (2014, March 18)

Decoherence, known as the consequence of the coupling of any quan- tum system to its environment, causes information loss in the system and represents a major problem in the physical realization of quan ... [more ▼]

Decoherence, known as the consequence of the coupling of any quan- tum system to its environment, causes information loss in the system and represents a major problem in the physical realization of quan- tum computers [1]. Decoherence-Free States (DFS) are considered as a possible solution to this problem. A set of trapped cold atoms placed in a DFS state will be immune against decoherence due to sponta- neous emission. However, because of dipole-dipole interactions between atoms, induced dephasing effects are likely to destroy the coherence and drive the system out of its DFS [1-2]. In this work, we study nu- merically the dynamics of a set of two-level atoms initially in a DFS with respect to dissipative processes by solving the master equation in- cluding both dissipative dynamics and dipole dipole interactions. We focus our attention on the influence of dipolar coupling on the radiated energy rate and coherence of the system as in [3]. In particular, by av- eraging over many realizations of close randomly distributed atomic positions, we show the formation of a superradiant-like pulse and we study its properties as a function of the dipolar coupling strength. [1] D. A. Lidar & K. B. Whaley, Lectures Notes in Phys., Vol. 622, p83-120, Springer (2003). [2] M. Gross & S. Haroche, Physics reports 93, 301-396 (1982). [3] W. Feng, Y. Li & S. -Y. Zhu, arXiv :1302.0957. (2013). [less ▲]

Detailed reference viewed: 24 (5 ULg)
See detailInfluence of dipole-dipole interactions on superradiance
Damanet, François ULg; Martin, John ULg

Poster (2013, September 02)

Superradiance, known as the cooperative spontaneous emission of a directional light pulse by excited atoms placed in vacuum, has recently regained attention in the context of photon localization [1] and ... [more ▼]

Superradiance, known as the cooperative spontaneous emission of a directional light pulse by excited atoms placed in vacuum, has recently regained attention in the context of photon localization [1] and single photon cooperative emission [2]. The dissipative dynamics of the atoms is known to depend dramatically on the ratio between the typical inter- atomic distance and the atomic transition wavelength, notably because of dipole-dipole interactions [3]. In this work, we study the effects of these interactions on superradiance as in [4] by solving numerically the corresponding master equation. In particular, by averaging over many realizations of the randomly distributed atomic positions, we show that the decay of the radiated energy pulse height with the intensity of the dipolar coupling follows a power law. [1] E. Ackermans, A. Gero & R. Kaiser, Phys. Rev. Lett. 101, 103602 (2008). [2] R. Friedberg & J. T. Manassah, J. Phys. B 43, 035501 (2010). [3] M. Gross & S. Haroche, Physics reports 93, 301-396 (1982). [4] B. Coffey & R. Friedberg, Phys. Rev. A 17, 1033 (1978). [less ▲]

Detailed reference viewed: 49 (6 ULg)
See detailInfluence of dipole-dipole interactions on the superradiant pulse
Damanet, François ULg; Martin, John ULg

Poster (2013, May 23)

Superradiance, known as the cooperative spontaneous emission of a directional light pulse by excited atoms placed in vacuum, has recently regained attention in the context of photon localization [1] and ... [more ▼]

Superradiance, known as the cooperative spontaneous emission of a directional light pulse by excited atoms placed in vacuum, has recently regained attention in the context of photon localization [1] and single photon cooperative emission [2]. The dissipative dynamics of the atoms is known to depend dramatically on the ratio between the typical inter-atomic distance and the atomic transition wavelength, notably because of dipole-dipole interactions [3]. In this work, we study the effects of these interactions on superradiance as in [4] by solving numerically the corresponding master equation. In particular, by averaging over many realizations of the randomly distributed atomic positions, we show that the decay of the radiated energy pulse height with the intensity of the dipolar coupling follows a power law. [1] E. Ackermans, A. Gero & R. Kaiser, Phys. Rev. Lett. 101, 103602 (2008). [2] R. Friedberg & J. T. Manassah, J. Phys. B 43, 035501 (2010). [3] M. Gross & S. Haroche, Physics reports 93, 301-396 (1982). [4] B. Coffey & R. Friedberg, Phys. Rev. A 17, 1033 (1978). [less ▲]

Detailed reference viewed: 22 (4 ULg)
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See detailINFLUENCE OF DISSOLVED MACROMOLECULES ON ADHERENCE OF PARTICULATE SOILS
Toure, Yetioman ULg; Sindic, Marianne ULg; Rouxhet, G. Paul

Conference (2013, June 12)

Polysaccharides, proteins, lipids and other biopolymers are the main components of food and pharmaceutical mixtures and may influence interactions at interfaces and thus fouling and cleaning. In this ... [more ▼]

Polysaccharides, proteins, lipids and other biopolymers are the main components of food and pharmaceutical mixtures and may influence interactions at interfaces and thus fouling and cleaning. In this study, quartz particles (10 to 30µm) were used as a model soil for examining the effect of dissolved proteins on the cleanability of substrates after soiling and drying. Glass and stainless steel pretreated by UV-Ozone (StSteel-UVO) were used as model hydrophilic substrates, while hydrophobic substrates were represented by stainless steel cleaned with ethanol (StSteel-Eth) and polystyrene. BSA and β-LGB were used as proteins. The quartz suspensions used for soiling (150g/L) were prepared in pure water and in a solution of each protein (8g/l). After soiling and drying, the cleanability was evaluated using a radial-flow cell, with pure water as the cleaning fluid. When soiling was made with a quartz suspension in pure water, the soil adherence increased with substrate hydrophilicity. This may be explained by better droplet spreading and increase of the capillary forces created upon drying. The presence of proteins in the suspension used for soiling hydrophilic substrates (Glass and StSteel-UVO), decreased the adherence of quartz particles. Its effect was less marked and tended to be opposite for less hydrophilic substrates (StSteel-Eth, Polystyrene). The comparison of different substrates and two proteins showed that the adherence cannot be explained by a simple relation with the contact angle. Other factors may be the solution surface tension itself and the protein behavior at the interfaces created by drying and by rehydratation during cleaning. When considering the influence of substrate on soiling, it must be kept in mind that high surface energy solids (metals, oxides) are readily contaminated in contact with air and lose their hydrophilicity. Amazingly this may improve the substrate behavior regarding cleanability with respect to particulate soil. [less ▲]

Detailed reference viewed: 22 (2 ULg)
See detailInfluence of DMM addition in light fuel oil on the flame emission in a domestic hot water boiler
Masy, Cédric; Ngendakumana, Philippe ULg

Conference (2004, August)

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler whose ... [more ▼]

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler whose burner is equipped with a spill-return atomizer. The tests have been performed in steady state regime without and with addition of DMM. During all the tests, the oxygen at the chimney was kept constant (around 3%) by adjusting the position of the burner air damper and thus the air combustion mass flow rate. The combustion chamber has two quartz windows through which the flame emission was registered by using a photodiode sensible in visible range. Classical gas analysers were used to measure the CO and NOx concentrations at the chimney. DMM percentages up to 15% (by mass) have been tested. [less ▲]

Detailed reference viewed: 14 (0 ULg)
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See detailInfluence of DNA condensation state on transfection efficiency in DNA/polymer complexes: An AFM and DLS comparative study
Volcke, C.; Pirotton, S.; Grandfils, Christian ULg et al

in Journal of Biotechnology (2006), 125(1), 11-21

Atomic force microscopy (AFM) is used to describe the formation process of polymer/DNA complexes. Two main objectives of this research are presented. The first one is to apply AFM as an effective tool to ... [more ▼]

Atomic force microscopy (AFM) is used to describe the formation process of polymer/DNA complexes. Two main objectives of this research are presented. The first one is to apply AFM as an effective tool to analyse DNA molecules and different polycation/DNA complexes in order to evaluate their degree of condensation (size and shape). The other one is to search for a relationship between the condensation state of DNA and its transfection efficiency. In this study, linear methacrylate based polymers and globular SuperFect polymers are used in order to induce DNA condensation. Ternary complexes, composed of methacrylate based polymers and polyethylene glycol (PEG)-based copolymers, are also investigated. AFM allows us to confirm good condensation conditions and relate them (or not) to transfection efficiencies. These AFM results (obtained after drying in air) are compared with measurements deduced from Dynamic Light Scattering (DLS) experiments performed in water. This comparison allowed us to identify the structural modifications resulting from deposition on the mica surface. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 6 (0 ULg)