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
Peer Reviewed
See detailEffects of crops on solute transport in undisturbed soil
Garré, Sarah ULg; Javaux, Mathieu; Vanderborght, Jan

Poster (2009)

Models predicting movement of surface applied chemicals incorporate knowledge on the water velocity field and moisture content distribution. Although the influence of root water uptake on solute transport ... [more ▼]

Models predicting movement of surface applied chemicals incorporate knowledge on the water velocity field and moisture content distribution. Although the influence of root water uptake on solute transport is commonly recognized as important, it has been studied sparsely. Yet, plants may take up a large part of the infiltrating water, thereby influencing the water flow pattern in the soil and concurrently solute transport processes. For this reason, experiments are required to investigate the relationship between plant root water uptake and flow field variability. The role of root water uptake on solute transport will be elucidated in two undisturbed soil columns. During three consecutive experiments, the influence of growing barley on tracer movement through a silty soil in two lysimeters will be followed. At the first stage, an inert tracer is put on the two bare lysimeters and leached with constant irrigation. As steady-state flow can be assumed, it is possible to follow the tracer movement in the column by ERT and to identify regions of preferential flow and solute transport parameters. During the second experiment, the tracer will be applied to mature barley grown in the lysimeters. Combining the information about the water content obtained with TDR with the relation between water content, soil solution salinity and bulk electrical conductivity, the soil solution salinity distribution can be derived from images of bulk electrical conductivity obtained with ERT. Root growth will be monitored using a minirhizotron. By comparing the transport parameters obtained after these two experiments, the effect of root water on the transport process can be quantified. When the columns are washed out and the barley is harvested, the third phase will be carried out under the same steady state flow conditions as in the first experiment to investigate the effect of dead roots on soil structure. [less ▲]

Detailed reference viewed: 15 (1 ULg)
Peer Reviewed
See detailEffects of culture conditions on the synthesis of human chorionic gonadotropin by placental organ cultures.
Huot, R. I.; Foidart, Jean-Michel ULg; Stromberg, K.

in In Vitro (1979), 15(7), 497-502

Culture conditions for maintaining first trimester human placenta in organ culture, which enhance the secretion of human chorionic gonadotropin (hCG), are described. Nutrient medium, oxygen tension and ... [more ▼]

Culture conditions for maintaining first trimester human placenta in organ culture, which enhance the secretion of human chorionic gonadotropin (hCG), are described. Nutrient medium, oxygen tension and Gelfoam support matrix influence the synthesis of hCG by these cultures. Placental tissue remained viable for the duration of experiments (12 days) as judged by the incorporation of tritiated thymidine into DNA and the lack of release of incorporated [125I]iododeoxyuridine. Optimal conditions for hCG synthesis in placental organ culture included an atmosphere of 95% air and 5% Co2 (approximately 20% O2), CMRL 1066 medium containing fetal human or bovine serum, insulin, hydrocortisone and retinal acetate. Multiple pieces of placenta could be cultured in the same dish with an additive effect on hCG secretion. The functional responsiveness of these placental cultures was demonstrated by modulation of hCG synthesis with theophylline and 3'5' dibutyryl cyclic AMP. [less ▲]

Detailed reference viewed: 2 (0 ULg)
Full Text
Peer Reviewed
See detailEffects of curing sodium nitrite additive and natural meat fat on growth control of Listeria monocytogenes by the bacteriocin-producing Lactobacillus curvatus strain CWBI-B28.
Kouakou, P.; Ghalfi, H.; Destain, Jacqueline ULg et al

in Food Microbiology (2009), 26

In realistic model meat systems, the separate and combined effects of fat content and sodium nitrite on the antilisterial activity of the bacteriocin of Lactobacillus curvatus CWBI-B28 were studied. In ... [more ▼]

In realistic model meat systems, the separate and combined effects of fat content and sodium nitrite on the antilisterial activity of the bacteriocin of Lactobacillus curvatus CWBI-B28 were studied. In laboratory fermentations where Listeria monocytogenes was co-cultured at 4 C with bacteriocin-producing CWBIB28 in lean pork meat (fat content: 13%) without added nitrite, a strong antilisterial effect was observed after one week. The effect was maintained for an additional week, after which a slight and very gradual rebound was observed. Both added nitrite (20 ppm) and a high-fat content (43%) were found to antagonise this antilisterial effect, the Listeria cfu count reached after six weeks being 200 times as high in high-fat meat with added nitrite than in lean meat without nitrite. This antagonism could not be attributed to slower growth of the bacteriocin-producing strain, since CWBI-B28 grew optimally in fatrich meat with 20 ppm sodium nitrite. Bacteriocin activity was also measured in the samples. The observed activity levels are discussed in relation to the degree of antilisterial protection conferred [less ▲]

Detailed reference viewed: 55 (10 ULg)
Full Text
Peer Reviewed
See detailEffects of cyanamide and acetaldehyde accumulation on the locomotor stimulant and sedative effects of ethanol in mice
Tambour, Sophie ULg; Closon, Catherine; Tirelli, Ezio ULg et al

in Behavioural Pharmacology (2007), 18(8), 777-784

Ethanol administration induces both locomotor stimulant and sedative effects depending upon blood ethanol concentrations. Recent studies in rats and mice suggest that acetaldehyde, the first product of ... [more ▼]

Ethanol administration induces both locomotor stimulant and sedative effects depending upon blood ethanol concentrations. Recent studies in rats and mice suggest that acetaldehyde, the first product of ethanol metabolism, might be involved in the expression of both the stimulant and the sedative effects of ethanol. A number of studies have used the drug cyanamide in an attempt to clarify the role of acetaldehyde in the behavioral effects of ethanol. The results of such studies are, however, difficult to interpret because cyanamide is an inhibitor of the enzymes catalase and aldehyde dehydrogenase, two enzymes with opposite effects on brain acetaldehyde concentrations. This study was aimed at clarifying the effects of cyanamide on ethanol-induced locomotor stimulant and sedative effects in Swiss mice. The locomotor stimulant effects of ethanol were measured in standard activity boxes, whereas the sedative effects of ethanol were quantified using the loss of righting reflex procedure. Cyanamide prevented the locomotor stimulant effects of 2 g/kg ethanol, although this was mainly due to a potentiation of the inhibitory effects of ethanol as evidenced by a prolongation of ethanol-induced loss of righting reflex. Additionally, 4-methylpyrazole, an inhibitor of the enzyme alcohol dehydrogenase, prevented these effects of cyanamide. It is concluded that in vivo the effects of cyanamide are predominantly due to the inhibition of the enzyme aldehyde dehydrogenase, rather than to its effects on catalase. [less ▲]

Detailed reference viewed: 50 (4 ULg)
Peer Reviewed
See detailThe effects of daylength and light intensiy on the reproductive development of Lolium temulentum
Périlleux, Claire ULg; Kinet, Jean-Marie; Bernier, Georges ULg

in Archives internationales de Physiologie et de Biochimie (1988), 96

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailEffects of delayed introduction of calcineurin inhibitor on GFR in liver transplant: 12 month data from a multi-centre randomised controlled study
Pirenne, J.; Boon, N.; Colle, I. et al

in Acta Gastro-Enterologica Belgica (2009, January), 72(1), 30

Detailed reference viewed: 22 (4 ULg)
Full Text
Peer Reviewed
See detailEffects of desert dust on air quality and human health. What do we know about West Africa compared to other regions?
De Longueville, Florence ULg; Henry, Sabine; Ozer, Pierre ULg

Conference (2009, February 24)

The main source of atmospheric mineral dust is the Sahara and its desertified margins that produce about half of the yearly global mineral dust. Saharan dust is often transported far away to the sources ... [more ▼]

The main source of atmospheric mineral dust is the Sahara and its desertified margins that produce about half of the yearly global mineral dust. Saharan dust is often transported far away to the sources and causes air quality deterioration impacting northwards the Mediterranean and Europe, westwards crossing the Atlantic Ocean to the United States, the Caribbean and South America, and southwards to the Gulf of Guinea. Saharan dust storms can lead to particulate levels that exceed internationally recommended levels and transport allergens, including bacteria and fungi. Therefore special attention is paid to dust storms as such mineral particulate matter air pollution may be a serious health threat in various regions of the world because it may promote respiratory infection, cardiovascular disease and other ailments. [less ▲]

Detailed reference viewed: 96 (13 ULg)
Full Text
Peer Reviewed
See detailEffects of design and kinematic parameters of rotary cultivators on soil structure
Destain, Marie-France ULg; Houmy, K.

in Soil & Tillage Research (1990), 17(3-4), 291-301

In comparison with drawn implements, rotary cultivators are of particular interest in final seedbed preparation. In this paper, a quantitative basis for the description of soil structure created by rotary ... [more ▼]

In comparison with drawn implements, rotary cultivators are of particular interest in final seedbed preparation. In this paper, a quantitative basis for the description of soil structure created by rotary tillers is given. Undisturbed Ap horizon samples were collected, impregnated with polyester resin, sectioned by sawing and analysed by means of image analysis. Total porosity, area and size of pores are related to the design and kinematic parameters of the rotary cultivator, arising from an analysis based upon the location of instant centres of velocity. It is shown that using a rotary cultivator with a higher ratio of peripheral to forward velocity leads to a smaller total mean porosity which is more homogeneous. [less ▲]

Detailed reference viewed: 48 (2 ULg)
Full Text
Peer Reviewed
See detailEffects of Dexamethasone on the Profile of Cytokine Secretion in Human Whole Blood Cell Cultures
Franchimont, Denis; Louis, Edouard ULg; Dewé, Walthère ULg et al

in Regulatory Peptides (1998), 73(1), 59-65

EXPERIMENTAL OBJECTIVES: The interaction between the endocrine and immune systems is a very intriguing area. Endogenous glucocorticoids, as end-effectors of the hypothalamo-pituitary-adrenal axis, inhibit ... [more ▼]

EXPERIMENTAL OBJECTIVES: The interaction between the endocrine and immune systems is a very intriguing area. Endogenous glucocorticoids, as end-effectors of the hypothalamo-pituitary-adrenal axis, inhibit the immune and inflammatory responses and are used as immunosuppressive drugs in many inflammatory, autoimmune and allergic diseases. The aims of this study were to investigate the effects of dexamethasone on the profile of cytokine secretion in whole blood cell cultures from healthy subjects and to analyse the gender-related sensitivity to dexamethasone on each cytokine secretion. RESULTS: There was a significant inhibition by dexamethasone (from 1 to 100 nM) on the secretion of monokines (IL-1beta, IL-6, IL-8 and TNF alpha) and lymphokines (IL-2, IL-4, IL-10 and IFN gamma), either after LPS or PHA stimulation (P < 0.01). Interleukin 4 and IL-10 were less inhibited than IFN gamma (P < 0.05 at 1 nM, P < 0.01 at 10 nM and P < 0.001 from 100 nM to 10 microM). No gender difference was observed in the rate of inhibition of the secretion of each cytokine. CONCLUSION: This study shows that the inhibition of cytokine secretion by dexamethasone is more marked on Th1-type cytokines than on Th2-type cytokines. These data support the idea that glucocorticoids may induce a shift from the Th1 to Th2 profile of cytokine secretion. [less ▲]

Detailed reference viewed: 37 (2 ULg)
Peer Reviewed
See detailEffects of dexamethasone treatment on growth performances, sexual axis and hormonal status in finishing bulls
Renaville, Robert ULg; Massart, Serge; Devolder, Anne et al

Poster (1993)

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailEffects of dexamethasone treatment on growth performances, sexual axis and hormonal status in finishing bulls
Renaville, Robert ULg; Massart, Serge; Devolder, Anne et al

in Journal of Animal Science (1993), 71(suppl 1), 232

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailEffects of diazoxide, benzothiadiazine and benzopyrane derivatives on mitochondrial proton and electron leaks of cardiomyocytes (H9C2 cell line).
Mouithys-Mickalad, Ange ULg; Ceusters, Justine ULg; Charef, M et al

Poster (2013)

Background: Mitochondria are double membrane- organelles that play a central role in cellular metabolism, calcium homeostasis and redox signaling. They have been also considered as main producers of ... [more ▼]

Background: Mitochondria are double membrane- organelles that play a central role in cellular metabolism, calcium homeostasis and redox signaling. They have been also considered as main producers of adenosine triphosphate (ATP) and reactive oxygen species (ROS). In many cancer cells those organelles become dysfunctional leading to a shift of energy metabolism from oxidative phosphorylation to active glycolysis and an increase of ROS generation. According to Warberg’ theory, cancer damage might occur at the mitochondrial level, affecting tiny structures within each cell implicated in the energy production through ATP. New insight is that mitochondria might be a good therapeutic target for metabolic syndromes, ischemia/reperfusion injury and organs transplantation. Therefore, search for novel molecules able to keep mitochondria functional are of relevant interest. Methodology: Cardiomyocytes (H9C2 cells) were from ATCC (USA) and grown till confluence. The basal cellular respiratory rate, proton and electron leaks as well as ATP production were measured with the High Resolution Oxygraphy (Oroboros, Austria). All compounds: diazoxide (DIAZ), diazoxide –related analogs (1: BPDZ-259, 2: BPDZ-444), and benzopyran derivatives (3: BPDZ-490, 4: BPDZ-711) were tested at final concentration of 10-5 M, except when specified and compared to control samples (cells with or without DMSO). Results and conclusion: The basal respiratory rate of H9C2 cells (5x106/mL) was changed depending on the chemical structure of the tested compounds: e.g. compound 3 strongly enhanced the routine respiration, while 4 displayed a marked lowering effect. In contrast, the addition of similar concentration of benzothiadiazin derivatives (1, 2) had no effect on routine respiration but also on the other respiratory parameters such as oligomycin-induced leak and ATP production. Similar profile was obtained with the reference molecule: diazoxide. Overall, our findings indicate that both diazoxide-like analogues (1 and 2) and diazoxide were without significant effect on basal respiration, ATP production, even on maximal respiration. Interestingly, two derivatives show opposite effects: compound 3 behaves as a uncoupling agent and the other one (4) exhibits a real lowering effect on respiration but that was reversible. The latter effect might be of interest if this kind of molecules could be used for further use as an agent for organ conservation during transplantation. Our results also demonstrate that diazoxide, a well-known Mito-KATP opener, did not exert its effect beside of clinical situation like ischemia/reperfusion injury. [less ▲]

Detailed reference viewed: 32 (3 ULg)
Peer Reviewed
See detailEffects of dibutyryl cyclic AMP on cultured brain cells from chick embryos of different ages.
Moonen, Gustave ULg; Sensenbrenner, M.

in Experientia (1976), 32(1), 40-42

Detailed reference viewed: 9 (0 ULg)
See detailEffects of dietary A-lipoic-acid on feed intake and hypothalamic AMPK activity of young broiler chicks
Wang, Y.; Willems, E.; Franssens, L et al

in Proceedings of the 6th Combined Workshop on Fundamental Physiology and Perinatal Development in Poultry (2013)

Detailed reference viewed: 12 (0 ULg)
Peer Reviewed
See detailEffects of dietary carbohydrate composition on rumen fermentation, plasma hormone and metabolites in growing fattening bull
Van Eenaeme, Christian ULg; Istasse, Louis ULg; Gabriel, Annick ULg et al

in Animal Production (1990), 50

A finishing diet containing barley and sugarbeet pulp 500:200 or 200:500 g/kg was given to 12 bulls twice daily at 08.00 and 16.00 h. The high-pulp diet increased rumen acetic and butyric acids and ... [more ▼]

A finishing diet containing barley and sugarbeet pulp 500:200 or 200:500 g/kg was given to 12 bulls twice daily at 08.00 and 16.00 h. The high-pulp diet increased rumen acetic and butyric acids and decreased propionic acid compared with the high-barley diet. The diurnal patterns over a 24-h period of rumen pH, volatile fatty acids, glucose and ammonia were characterized by 2 cycles. The high-pulp induced more even fermentations as indicated by flatter curves with less extreme values than those produced by high-barley diet. Ammonia concentration was high before feeding and decreased subsequently during 4 to 6 h after the meal. No typical patterns were observed in plasma concentrations of glucose and alpha-amino nitrogen. Plasma urea concentration increased 2 h after feeding and dropped during the following 6 to 8 h. There were no effects of dietary carbohydrate composition on growth hormone concentration but plasma insulin was significantly reduced with the high-pulp diet. Furthermore, the insulin profile showed peaks after each meal with the high-barley diet but only after the afternoon feeding with the high-pulp diet. [less ▲]

Detailed reference viewed: 24 (5 ULg)
Peer Reviewed
See detailThe effects of dietary crude protein on growth of the Eurasian perch Perca fluviatilis
Fiogbe, E. D.; Kestemont, P.; Mélard, Charles ULg et al

in Aquaculture (1996)

Detailed reference viewed: 13 (1 ULg)
Full Text
See detailEffects of dietary fibres on greenhouse gas and ammonia emissions associated to gestating sows
Philippe, François-Xavier ULg; Laitat, Martine ULg; Wavreille, José et al

in Cabaraux, Jean-François; Delguste, Catherine; Frippiat, thibault (Eds.) et al Proceedings of the 1st Scientific Meeting of the Faculty of Veterinary Medicine (Liège – Belgium) (2011)

Usually, gestating sows are restrictedly-fed to prevent excessive body weight gain and fat deposition. However, feed restriction causes sustained feeding motivation resulting in stereotypic behaviour and ... [more ▼]

Usually, gestating sows are restrictedly-fed to prevent excessive body weight gain and fat deposition. However, feed restriction causes sustained feeding motivation resulting in stereotypic behaviour and impairment of animal welfare. High fibre diets (HFD) are known to reduce feeding motivation without impairments of performance but the effects of HFD on emissions of pollutant gases are very few studied. Thus, a study was carried out to compare the effect of two fibre contents (standard diet (STD) with 22% of non-starch polysaccharides (NSP) vs. HFD with 44% of NSP) on emissions of ammonia (E-NH3), nitrous oxide (E-N2O), methane (E-CH4) and CO2-equivalents (E-EqCO2) associated to gestating sows. Three successive batches of 10 gestating sows were divided into 2 homogeneous groups and randomly allocated to one of two treatments: STD vs. HFD. The groups were kept separately in two identical rooms equipped with a pen divided into a lying area with slatted floor and five individual feeding stalls with permanent access. Emissions were measured by infrared photoacoustic detection. The HFD significantly decreased ENH3 (12.1 vs. 15.9 g/sow.day) but increased E-EqCO2 (0.68 vs. 0.47 kg/sow.day) in relation with an increase of E-CH4 (18.4 vs. 9.1 g/sow.day), E-N2O being not impacted by the diet, with value around 0.60 g/sow.day. So, the effects of HFD offered to gestating sows on slatted floor on environment seem conflicting with a decrease of NH3 emissions which mainly contribute to acidification of soils and waters and eutrophication, but an increase of CO2-quivalents emissions which contribute to greenhouse effect and climate change. [less ▲]

Detailed reference viewed: 35 (7 ULg)
Full Text
See detailEffects of dietary methylmercury on the Zebrafish (Danio rerio) liver proteome
Brésart, David ULg; Fourdrilis, Séverine; Mathy, Grégory ULg et al

Poster (2010, July 19)

Methylmercury (MeHg) is an aquatic pollutant. It is produced from HgS by the action of sulphate-reducing bacteria and is released in fresh waters. MeHg is bioaccumulated through the trophic chain and is ... [more ▼]

Methylmercury (MeHg) is an aquatic pollutant. It is produced from HgS by the action of sulphate-reducing bacteria and is released in fresh waters. MeHg is bioaccumulated through the trophic chain and is known to cause different health troubles (trembling, memory loss, anemia and kidney deficiency). Toxic exogenous substances, such as MeHg, are transformed by liver’s metabolic pathway, making this the starting point of vertebrate detoxication. Almost 50% of MeHg assimilated in hepatocytes is accumulated in mitochondria (Ware et al.,1975) and It has been suggested that it may uncouples OXPHOS (Mori et al., 2007). The aim of this study was to identify the proteomics modifications of the liver mitochondrial proteome in response to a chronic MeHg intoxication by using the 2D DIGE methodology (Figure 1). Fishes were fed with two different contaminated diets (6.5 and 13.5 µg of MeHgCl / g of dry food.). We have also performed functional assays in order to confirm the MeHg uncoupling effect on Salmo truita liver mitochondria. [less ▲]

Detailed reference viewed: 53 (9 ULg)
Full Text
Peer Reviewed
See detailThe Effects of Dietary N-3 and Antioxidant Supplementation on Erythrocyte Membrane Fatty Acid Composition and Fluidity in Exercising Horses
Portier, Karine; de Moffarts, Brieuc; Fellman, Nicole et al

in Equine Veterinary Journal. Supplement (2006), 36

REASONS FOR PERFORMING STUDY: Fatty acid supplementation could modulate erythrocyte membrane fluidity in horses at rest and during exercise, but information is lacking on the effect of exercise ... [more ▼]

REASONS FOR PERFORMING STUDY: Fatty acid supplementation could modulate erythrocyte membrane fluidity in horses at rest and during exercise, but information is lacking on the effect of exercise. OBJECTIVES: To assess the effect of exercise with, and without, an oral antioxidant supplementation enriched with n-3 fatty acids on erythrocyte membrane fluidity (EMF) and fatty acid composition in eventing horses. METHODS: Twelve healthy and regularly trained horses were divided randomly into 2 groups: group S received an oral antioxidant cocktail enriched in n-3 fatty acid (alphatocopherol, eicosapentaenoic acid [EPA] and docosahexaenoic acid [DHA]) whereas group P was placebo-treated. At the end of 4 weeks, all horses performed a standardised exercise test (ET) under field conditions. Venous blood was sampled before starting treatment (TO), immediately before (T1) as well as 15 min (T2) and 24 h (T3) after ET. Spin labelled (16-DOXYL-stearic acid) red blood cell membranes were characterised using the relaxation correlation time (Tc in inverse proportion to EMF). Fatty acid composition (%) of the membrane was determined by gas-liquid chromatography. RESULTS: Supplementation did not induce changes in EMF (T1 vs. TO) but significant changes in membrane composition were observed and there were increases in n-3 polyunsaturated fatty acid PUFA, n-3/n-6 ratio, and total n-3 fatty acids. Exercise (T2 vs. T1) induced a significant decrease of EMF in group P (Tc: +19%, P<0.05) and nonsignificant decrease in group S (Tc: +5%), whereas membrane fatty acid composition did not change in either group. During the recovery period (T3 vs. T2), EMF decreased significantly in group S (Tc: +29%, P<0.05) and nonsignificantly in group P (Tc: +18%) without any significant changes in fatty acid composition. CONCLUSION AND POTENTIAL RELEVANCE: An enriched oral antioxidant supplementation induced changes in membrane composition, which modulated the decrease in EMF induced by exercise. Long chain n-3 fatty acid supplementation might therefore be beneficial. [less ▲]

Detailed reference viewed: 24 (1 ULg)