Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailEffects of the roll forming process on the mechanical properties of thin-walled sections made of non linear metallic materials
Rossi, Barbara ULg; Boman, Romain ULg; Degée, Hervé ULg

in Proceedings of the 6th International Conference on Thin Walled Structures: ICTWS2011, Timisoara 5-7 September 2011 (2011, September 05)

It is well known that the cold-forming process is likely to significantly enhance the mechanical properties of the profile by strain hardening leading to increased resistance compared to a resistance ... [more ▼]

It is well known that the cold-forming process is likely to significantly enhance the mechanical properties of the profile by strain hardening leading to increased resistance compared to a resistance assessment based on nominal properties. It is thus necessary to accurately determine the mechanical properties after the cold process of fabrication. The knowledge on these enhanced properties is rather good for profiles made of traditional construction steel (carbon steel with yield strength between 200 and 400 MPa) characterized by an elasticplastic behaviour. However less information is available for profiles made of materials exhibiting a non linear stress-strain relationship. In this context, the paper presents a parametric study on roll-profiled channel sections. For that purpose, the finite element code METAFOR developed at the LTAS division of the University of Liège is used to simulate the forming process of profiles made of high strength steel and of stainless steel. In the simulations, different values of the radius to thickness ratio of the corners are considered. The results of the numerical simulations are expressed in terms of resulting proof strength in the corners versus the radius to thickness ratio for the different materials. They are finally compared to existing predictive formulations. Additional considerations are also given on the forming process itself (i.e. on the configuration of the rolls or on the springback). [less ▲]

Detailed reference viewed: 112 (20 ULg)
Full Text
Peer Reviewed
See detailEffects of the social conditions of housing through testing on cocaine-induced contextual sensitisation and conditioned locomotion in C57BL/6J mice
Michel, Alexa ULg; Tirelli, Ezio ULg

in Progress in Neuro-Psychopharmacology & Biological Psychiatry (2002), 26(6), 1185-1191

The potential differential effects of isolated and collective housing through the testing phase on sensitisation to cocaine-induced locomotion, the subsequent conditioned locomotion and the context ... [more ▼]

The potential differential effects of isolated and collective housing through the testing phase on sensitisation to cocaine-induced locomotion, the subsequent conditioned locomotion and the context-dependent expression of sensitisation were examined in C57BL/6J male mice. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
Peer Reviewed
See detailEffects of the stage of maturation and varieties on the chemical composition of banana and plantain peels
Happi Emaga, Thomas ULg; Andrianaivo, Rado; Wathelet, Bernard ULg et al

in Food Chemistry (2007), 103(2), 590-600

A study of the chemical composition of six varieties of fruit peels of the banana and plantain: dessert banana (Musa AAA), plantain (Musa AAB) cooking banana (Musa ABB) and hybrid (Musa AAAB) at three ... [more ▼]

A study of the chemical composition of six varieties of fruit peels of the banana and plantain: dessert banana (Musa AAA), plantain (Musa AAB) cooking banana (Musa ABB) and hybrid (Musa AAAB) at three stages of ripeness, was carried out in order to explore their potential applications. The varieties did not affect chemical constituents in a consistent manner. Peel of the six varieties was rich in total dietary fibre (TDF) (40-50%). The protein content in peel of the banana and plantain was 8-11%. Leucine, valine, phenylalanine and threonine were essential amino acids in significant quantities: Lysine was the limiting amino acid. The content of lipid varied from 2.2% to 10.9% and was rich in polyunsaturated fatty acids, particularly linoleic acid and alpha-linolenic acid. Potassium was the most significant mineral element. Peel of plantain was richer in starch than were the banana peels. Maturation of fruits involved increase in soluble sugar content and, at the same time, decrease in starch. The degradation of the starch under the action of the endogenous enzymes, may explain the increase in the soluble sugar content. Further investigations on the composition and the physiological functions (using animal-feeding experiments) of these dietary fibres must be considered. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 199 (14 ULg)
See detailEffects of therapeutic measures taken during the aura
Schoenen, Jean ULg

in Amery, W. K.; Wauquier, A. (Eds.) The Prelude of the Migraine Attack (1986)

Detailed reference viewed: 11 (0 ULg)
Full Text
Peer Reviewed
See detailEffects of thiazolidinediones on tumor necrosis factor R alpha induced inflammatory cytokine expression
Desmet, Christophe ULg; Warsée, Barbara; Mélotte, D. et al

in Pflügers Archiv : European Journal of Physiology (2004), 447

Detailed reference viewed: 13 (3 ULg)
Full Text
Peer Reviewed
See detailEffects of thiol reagents on Streptomyces K15 DD-peptidase-catalysed reactions
Leyh-Bouille, Mélina; Nguyen-Distèche, Martine ULg; Bellefroid-Bourguignon, Catherine et al

in Biochemical Journal (1987), 241(3), 893-897

The 26,000-Mr DD-peptidase of Streptomyces K15 binds one equivalent of thiol reagents as 5,5'-dithiobis-(2-nitrobenzoate) or p-chloromercuribenzoate (pCMB). Derivatization of the DD-peptidase by pCMB ... [more ▼]

The 26,000-Mr DD-peptidase of Streptomyces K15 binds one equivalent of thiol reagents as 5,5'-dithiobis-(2-nitrobenzoate) or p-chloromercuribenzoate (pCMB). Derivatization of the DD-peptidase by pCMB decreases the efficacy of the initial binding of the ester carbonyl donor Ac2-L-Lys-D-Ala-D-lactate to the enzyme (K), the rate of enzyme acylation by the donor (K+2) and the rate of enzyme deacylation (k+3). However, the value of the k+2/k+3 ratio, and therefore the percentage of total enzyme which, at saturating concentrations of the donor, is present as acyl-enzyme at the steady state of the reaction, are not modified. The enzyme's binding sites for pCMB and benzylpenicillin are not mutually exclusive. But, when compared with the native enzyme, the pCMB-derivatized enzyme undergoes acylation by benzylpenicillin with a decreased second-order-rate constant (k+2/K) value and gives rise to a penicilloyl adduct of increased stability. Since the acyl-enzyme mechanism is not annihilated by pCMB derivatization, it is proposed that basically, and like all the other DD-peptidases/penicillin-binding proteins so far characterized, the Streptomyces K15 DD-peptidase is an active-site-serine enzyme. [less ▲]

Detailed reference viewed: 8 (0 ULg)
Full Text
Peer Reviewed
See detailEffects of three avocado/soybean unsaponifiable mixtures on human chondrocytes metabolism
Henrotin, Yves ULg; Labasse, A; Zheng, SX et al

in Arthritis and Rheumatism (1996), 39

Detailed reference viewed: 10 (3 ULg)
Full Text
Peer Reviewed
See detailEffects of three avocado/soybean unsaponifiable mixtures on metalloproteinases, cytokines and prostaglandin E2 production by human articular chondrocytes.
Henrotin, Yves ULg; Labasse, A. H.; Jaspar, J. M. et al

in Clinical Rheumatology (1998), 17(1), 31-9

The in-vitro effects of avocado and soybean unsaponifiable residues on neutral metalloproteinase activity, cytokines and prostaglandin E2 (PGE2) production by human articular chondrocytes were ... [more ▼]

The in-vitro effects of avocado and soybean unsaponifiable residues on neutral metalloproteinase activity, cytokines and prostaglandin E2 (PGE2) production by human articular chondrocytes were investigated. Avocado and soybean unsaponifiable residues were mixed in three ratios: 1:2 (A1S2), 2:1 (A2S1) or 1:1 (A2S2). Freshly isolated human chondrocytes were cultured for 72 h in the absence or presence of interleukin-1beta, (IL-1beta) (17 ng/ml), with or without unsaponifiable residue mixtures at a concentration of 10 microg/ml. A/S unsaponifiable residues were also tested separately at concentrations of 3.3, 6.6 and 10 microg/ml. All A/S unsaponifiable mixtures reduced the spontaneous production of stromelysin, interleukin-6 (IL-6), interleukin-8 (IL-8) and prostaglandin E2 (PGE2) by chrondrocytes. At concentrations of 3.3 and 6.6 microg/ml, A/S residues, tested separately, were potent inhibitors of the production of IL-8 and PGE2. Nevertheless, only avocado residue inhibited IL-6 production at these concentrations. A/S unsaponifiable mixtures had a more pronounced inhibitory effect on cytokine production than avocado or soybean residues added alone. As anticipated, IL-1beta induced a marked release of collagenase, stromelysin, IL-6, IL-8 and PGE2. A/S unsaponifiable mixtures partially reversed the IL-1 effects on chrondrocytes. These findings suggest a potential role for A/S unsaponifiable extracts in mitigating the deleterious effects of IL-1beta: on cartilage. [less ▲]

Detailed reference viewed: 21 (6 ULg)
Peer Reviewed
See detailEffects of thromboxane A2 receptor antagonists and COX inhibitors on osteogenic sarcome cell-induced platelet aggregation
De Leval, X.; Delarge, J.; Neven, P. et al

Poster (2001, June 01)

Detailed reference viewed: 2 (0 ULg)
Peer Reviewed
See detailEffects of thromboxane A2 receptor antagonists and thromboxane synthase inhibitors on osteogenic sarcoma cell induced platelet aggregation
De Leval, X.; Benoît, V.; Neven, P. et al

Poster (2002, October)

Detailed reference viewed: 6 (2 ULg)
Peer Reviewed
See detailEffects of thromboxane A2 receptor antagonists and thromboxane synthase inhibitors on osteogenic sarcoma cell induced platelet aggregation
De Leval, X.; Benoît, V.; Neven, P. et al

Poster (2002, May)

Detailed reference viewed: 6 (2 ULg)
Full Text
Peer Reviewed
See detailEffects of thromboxane A2 receptor antagonists and thromboxane synthase inhibitors on osteogenic sarcoma cell-induced platelet aggregation
De Leval, X.; Benoit, V.; Neven, P. et al

in Fundamental & Clinical Pharmacology (2002)

Detailed reference viewed: 8 (1 ULg)
Peer Reviewed
See detailEffects of thromboxane A2 receptor antagonists and thromboxane synthase inhibitors on osteogenic sarcoma cell-induced platelet aggregation
De Leval, X.; Benoit, V.; Neven, P. et al

Poster (2002, March 02)

Detailed reference viewed: 5 (1 ULg)
Full Text
Peer Reviewed
See detailEffects of thromboxane A2 receptor antagonists and thromboxane synthase inhibitors on osteogenic sarcoma cell-induced platelet aggregation
De Leval, X.; Benoit, V.; Neven, P. et al

in Fundamental & Clinical Pharmacology (2002), 16

Detailed reference viewed: 5 (2 ULg)
Full Text
Peer Reviewed
See detailEffects of tillage practices and crop residue exportation on earthworm communities and soil physico-­chemical properties in silt loam arable soil (Belgium)
Lemtiri, Aboulkacem ULg; Colinet, Gilles ULg; Alabi, Taofic ULg et al

Poster (2014, June 08)

Earthworms are known to play integral roles in soils, and are often referred to as vital soil and ecosystem engineers due to their capacity to influence a wide range of chemical, physical, and biological ... [more ▼]

Earthworms are known to play integral roles in soils, and are often referred to as vital soil and ecosystem engineers due to their capacity to influence a wide range of chemical, physical, and biological properties of soil environments. Therefore, it is important to understand how earthworm communities are impacted by tillage systems and crop management practices. In the present study, earthworm and soil samples were collected from wheat cultivated fields in Gembloux, Belgium under the following four experimental treatments: (1) conventional tillage with crop residues left in the soil (CT/IN); (2) conventional tillage with crop residues removed from the field (CT/OUT); (3) reduced tillage with crop residues left in the soil (RT/IN); and (4) reduced tillage with crop residues removed from the field (RT/OUT). The different tillage systems were applied for four consecutive years prior to the initiation of the current study. Results indicated soil compaction was significantly higher in RT compared with CT up to a depth of 6–49 cm. Significant differences were not detected between residue incorporation depth systems, where results showed mean earthworm abundance was respectively 182.25 and 180 individuals.m-2 in CT and RT. Mean earthworm biomass was similarly not significantly different between CT and RT, where results were respectively 48.52 and 57.27 g.m-2. However, a significant difference was observed between IN and OUT treatments, suggesting the exportation of wheat residues will limit earthworm abundance and biomass in CT and RT plots. Data showed high representation of the endogeic earthworm ecological category, notably N. c. caliginosus regardless of treatment. Despite tillage system and exportation of crop residues, N. c. caliginosus, L. terrestris, and A. r. rosea exhibited high abundance, indicating tolerance to soil environmental conditions. For each depth, measures of soil physico-chemical properties showed significant differences among treatments. Furthermore, soil chemical property attributes were significantly higher in the first soil centimetres compared to lower soil layers. These results were attributable to earthworm activity and wheat residues, suggesting earthworms contributed to nutrient dynamics, particularly at increased soil depths. Overall, the results emphasise the influence of exportation of crop residues on earthworm community and also, the important influence of earthworm activity on soil physico-chemical properties change, processes which are closely linked. [less ▲]

Detailed reference viewed: 65 (12 ULg)