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See detailInfluence of extraction conditions on characteristics of microbial polysaccharide kefiran isolated from kefir grains biomass
Pop Rodica, Carmen; Salanţă, Liana; M. Rotar, Ancuţa et al

in Journal of Food and Nutrition Research (2016)

Kefiran is a water-soluble polysaccharide, which can be isolated from kefir grains biomass. Rheological behaviour and physico-chemical characteristics of kefiran solutions were influenced by the ... [more ▼]

Kefiran is a water-soluble polysaccharide, which can be isolated from kefir grains biomass. Rheological behaviour and physico-chemical characteristics of kefiran solutions were influenced by the extraction parameters. Degradation of the polymer chain occurred at the highest temperature tested (100 °C). The intrinsic viscosity of kefiran solutions (0.1 g·ml-1) varied between 8.24 mPa at 100 °C to 19.32 mPa at 80 °C. Regarding rheological properties, kefiran solutions had characteristics of a Newtonian behaviour in diluted solutions and pseudoplastic at higher concentrations. High-performance liquid chromatography analysis of monosaccharides revealed that kefiran is composed of glucose and galactose in a relative molar ratio of 0.94–1.1. Infrared spectra of kefiran suggested the structure of α- and β-configurations in pyranose-form carbohydrates, which indicated a purified structure of kefiran. The molecular weight of kefiran polymer was between 2.4 × 106 Da and 1.5 × 107 Da, the values of molecular weight depending on extraction conditions. This polysaccharide was found to have higher intrinsic viscosity and higher apparent viscosity in aqueous solutions, which brings a perspective for its use as thickening or gelling agent in food, or as a matrix in film-forming solutions. [less ▲]

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See detailInfluence Of Extrusion On Ruminal And Intestinal Disappearance In Sacco Of Pea (Pisum-Sativum) Proteins And Starch
Walhain, Philippe; Foucart, Michel; Thewis, André ULg

in Animal Feed Science & Technology (1992), 38(1), 43-55

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See detailThe influence of facial emotion displays gender, and ethnicity on judgments of dominance and affiliation
Hess, U; Blairy, Sylvie ULg; Kleck, R

in Journal of Nonverbal Behavior (2000), 24(4), 265-283

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See detailInfluence of fasting on serum IGFBPs levels in broiler breeders.
Bruggeman, Veerle; Renaville, Robert ULg; Vanmontfort, D. et al

in Hormone binding proteins: physiology and clinical implications symposium (1995)

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See detailINFLUENCE OF FATIGUE ON THE STRIDE CHARACTERISTICS DURING AN INTENSE ENDURANCE RUNTEST
Jidovtseff, Boris ULg; Rodriguez de la Cruz, Carlos ULg; Croisier, Jean-Louis ULg et al

in Abstract book of 17th ECSS Congress (2012, July)

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See detailInfluence of fermentable carbohydrates or protein on large intestinal and urinary metabolomic profiles in piglets
Pieper, R; Neumann, K; Kröger, S et al

in Journal of Animal Science (2012), 90(Supplement 4), 34-36

It was recently shown that variations in the ratio of dietary fermentable carbohydrates (fCHO) and fermentable protein (fCP) differentially affect large intestinal microbial ecology and the mucosal ... [more ▼]

It was recently shown that variations in the ratio of dietary fermentable carbohydrates (fCHO) and fermentable protein (fCP) differentially affect large intestinal microbial ecology and the mucosal response. Here we investigated the use of mass spectrometry to profile changes in metabolite composition in colon and urine associated with variation in dietary fCHO and fCP composition and mucosal physiology. Thirty-two weaned pigletswere fed 4 diets in a 2 × 2 factorial design with low fCP and low fCHO, low fCP and high fCHO, high fCP and low fCHO, and high fCP and high fCHO. After 21 to 23 d, all pigs were euthanized and colon digesta and urine metabolite profiles were obtained by mass spectrometry. Analysis of mass spectra by partial least squares approach indicated a clustering of both colonic and urinary profiles for each pig by feeding group. Metabolite identification and annotation using the Kyoto Encyclopedia of Genes and Genomes (KEGG) metabolic pathways revealed increased abundance of metabolites associated with arachidonic acid metabolism in colon of pigs fed a high concentration of fCP irrespective of dietary fCHO. Urinary metabolites did not show as clear patterns. Mass spectrometry can effectively differentiate metabolite profiles in colon contents and urine associated with changes in dietary composition. Whether metabolite profiling is an effective tool to identify specific metabolites (biomarkers) or metabolite profiles associated with gut function and integrity needs further elucidation. [less ▲]

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See detailThe Influence of Fetal and Postnatal Growth on Heart Rate Variability in Young Infants
Massin, M. M.; Withofs, Nadia ULg; Maeyns, K. et al

in Cardiology (2001), 95(2), 80-3

Heart rate variability (HRV), a measure of cardiac autonomic control, was analyzed in infants to assess the hypothesis that early undernutrition may induce autonomic dysfunction that could play a role in ... [more ▼]

Heart rate variability (HRV), a measure of cardiac autonomic control, was analyzed in infants to assess the hypothesis that early undernutrition may induce autonomic dysfunction that could play a role in the programming of later cardiovascular disease. HRV data were collected during a night session in 546 healthy infants at 5-12 weeks of adjusted age, and statistical associations with fetal and postnatal growth indices were established. A significant positive correlation between birth weight, the ratio of neonatal weight to head circumference and postnatal weight gain, and HRV indices mostly influenced by sympathetic activity was demonstrated in 11- and 12-week-old infants. A slight correlation (p > 0.05) was also found in younger infants. These data suggest the influence of fetal and postnatal growth on the programming of the autonomic nervous system beyond the neonatal period. This influence may be one of the important mechanisms that link impaired growth in fetal and infant life to high blood pressure and other cardiovascular disease during childhood and adulthood (the Barker hypothesis). [less ▲]

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See detailInfluence of Fiber Distribution and Grain Size on the Mechanical Behavior of Friction Stir Processed Mg-C Composites
Mertens, Anne ULg; Montrieux, Henri-Michel ULg; Lecomte-Beckers, Jacqueline ULg et al

Conference (2012, November 12)

Short C fibers-Mg matrix composites have been produced by friction stir processing sandwiches made of a layer of C fabric stacked between two sheets of either the ductile Mg alloy AZ31B, or of the less ... [more ▼]

Short C fibers-Mg matrix composites have been produced by friction stir processing sandwiches made of a layer of C fabric stacked between two sheets of either the ductile Mg alloy AZ31B, or of the less ductile alloy AZ91D, that is capable of age hardening. It has been shown that the choice of the optimal experimental parameters for the production of sound composites was strongly dependent on the nature of the matrix. 3D X-ray tomography reveals that the fibers orient along the onion rings and that they are more or less fragmented depending on the local shear stress during the process. The fiber volume fraction is increased when the nugget volume decreases in particular for the AZ91D base material and for a high advancing speed for the AZ31B base material. The fiber volume fraction influences directly the grain size, the hardness and the tensile properties of the composites. [less ▲]

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See detailInfluence of Fibre Distribution and Grain Size on the Mechanical Behaviour of Friction Stir Processed Mg-C Composites
Mertens, Anne ULg; Simar, Aude; Adrien, Jérôme et al

in Materials Characterization (2015), 107

Short C fibres-Mg matrix composites have been produced by friction stir processing sandwiches made of a layer of C fabric stacked between two sheets of Mg alloy AZ31B or AZ91D. This novel processing ... [more ▼]

Short C fibres-Mg matrix composites have been produced by friction stir processing sandwiches made of a layer of C fabric stacked between two sheets of Mg alloy AZ31B or AZ91D. This novel processing technique can allow the easy production of large-scale metal matrix composites. The paper investigates the microstructure of FSPed C fibre-Mg composites in relation with the fragmentation of the C fibres during FSP and their influence on the tensile properties. 3D X-ray tomography reveals that the fibres orient like onion rings and are more or less fragmented depending on the local shear stress during the process. The fibre volume fraction can be increased from 2.3% to 7.1% by reducing the nugget volume, i.e. by using a higher advancing speed in AZ31B alloy or a stronger matrix alloy, like AZ91D alloy. A higher fibre volume fraction leads to a smaller grain size which brings about an increase of the composite yield strength by 15 to 25%. However, a higher fibre volume fraction also leads to a lower fracture strain. Fracture surface observations reveal that damage occurs by fibre/matrix decohesion along fibres oriented perpendicularly to the loading direction. [less ▲]

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See detailInfluence of firing time and framework thickness on layered Y-TZP discs curvature
Jakubowicz, Boris; MAINJOT, Amélie ULg; Sadoun, Michael

in Dental Materials (2013, December), 29(E25-E26),

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See detailInfluence of firing time and framework thickness on veneered Y-TZP discs curvature.
Jakubowicz-Kohen, Boris D.; Sadoun, Michael J.; Douillard, Thierry et al

in Dental materials : official publication of the Academy of Dental Materials (2014), 30(2), 242-248

OBJECTIVES: The objective of the present work was to study the curvature of very thinly, veneered Y-TZP discs of different framework thicknesses submitted to different firing times. METHODS: Fifteen 20-mm ... [more ▼]

OBJECTIVES: The objective of the present work was to study the curvature of very thinly, veneered Y-TZP discs of different framework thicknesses submitted to different firing times. METHODS: Fifteen 20-mm-wide Y-TZP discs were produced in three different thicknesses: 0.75, 1, 1.5mm. One disc from each group was left unveneered while the others were layered with a 0.1mm veneering ceramic layer. All discs underwent five firing cycles for a total cumulative firing time of 30min, 1, 2, 5 and 10h at 900 degrees C. The curvature profile was measured using a profilometer after the veneering process and after each firing cycle respectively. A fitted curve was then used to estimate the, curvature radius. The coefficient of thermal expansion (CTE) measurements were taken on veneering, ceramic and Y-TZP beam samples that underwent the same firing schedule. Those data were used to calculate the curvature generated by CTE variations over firing time. RESULTS: All bilayered samples exhibited a curvature that increased over firing time inversely to framework thickness. However non-veneered samples did not exhibit any curvature modification. SIGNIFICANCE: The results of the present study reveal that even a very thin veneer layer (0.1mm) can induce a significant curvature of Y-TZP discs. The dilatometric results showed that Tg and CTE, variations are not sufficient to explain this curvature. A chemical-induced zirconia volume, augmentation located at the framework sub-surface near the interface could explain the sample, curvature and its increase with firing time. [less ▲]

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See detailThe influence of foam morphology of multi-walled carbon nanotubes/poly(methyl methacrylate) nanocomposites on electrical conductivity
Tran, Minh Phuong ULg; Detrembleur, Christophe ULg; Alexandre, Michaël ULg et al

in Polymer (2013), 54(13), 3261-3270

Polymer/multi-walled carbon nanotubes (PMMA/MWNTs) nanocomposites foams are widely investigated during the last decade thanks to their potential applications as electromagnetic interferences shielding ... [more ▼]

Polymer/multi-walled carbon nanotubes (PMMA/MWNTs) nanocomposites foams are widely investigated during the last decade thanks to their potential applications as electromagnetic interferences shielding (EMI) materials. Electrical conductivity of the nanocomposite is a key parameter for these applications. In the frame of this work, we aim at establishing relationships between the foams morphology and their electrical conductivity. We therefore first design nanocomposite foams of various morphologies using supercritical carbon dioxide (scCO2) as physical foaming agent. The nanocomposites based on poly(methyl methacrylate) (PMMA) and different carbon nanotubes loadings are prepared by melt-mixing and foamed by scCO2 in various conditions of pressure, temperature and soaking time. The influence of these foaming conditions on the morphology of the foams (volume expansion, pore size, cell density, cell-wall thickness) is discussed. After measuring the electrical conductivity of the foams, we establish structure/properties relationships that are essential for further optimizations of the materials for the targeted application. [less ▲]

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See detailThe influence of follicular dendritic cells on B-cell proliferation depends on the activation of B cells and the mitogen used.
Bosseloir, A.; Bouzahzah, F.; Defrance, T. H. et al

in Scandinavian Journal of Immunology (1996), 43(1), 23-30

Follicular dendritic cells (FDC) are unique non-lymphoid cells found only in lymph follicles. They play a part in the survival, proliferation and differentiation of B cells. To analyse the influence of ... [more ▼]

Follicular dendritic cells (FDC) are unique non-lymphoid cells found only in lymph follicles. They play a part in the survival, proliferation and differentiation of B cells. To analyse the influence of FDC on B-lymphocyte proliferation, we isolated them from human tonsils on albumin gradients and treated them with mitomycin C to prevent the multiplication of lymphoid cells harboured in their cytoplasmic evaginations. FDC cultured for 12-16 h remained attached to the substrate; non-adherent cells were carefully eliminated by washing. Purified B cells cultured alone or with contaminant-cleared FDC were maintained for 2 days in the presence or absence of various stimulants, after which tritiated thymidine uptake by these cells was measured. In the absence of activators, FDC did not induce B-cell multiplication. B cells cultured in the presence of FDC exhibited increased 3H-TdR uptake when activated with anti-CD40 MoAb, anti-immunoglobulin MoAb or transferrin, but not when stimulated with Staphylococcus aureus strain Cowan I (SAC) at a given concentration. In the latter case, B-cell proliferation clearly decreased. In control cocultures where mitomycin-C-treated non-adherent cells were used instead of FDC in the presence of the different stimulants, no increase in B-cell proliferation was observed. The results suggest that, inside the germinal centres, FDC modulation of B-cell proliferation depends on the activation state of the B cells and on the stimulant encountered. [less ▲]

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See detailInfluence of food resources on the ranging pattern of Northern pig-tailed macaques (Macaca leonina)
Albert, Aurelie; Huynen, Marie-Claude ULg; Savini, Tommaso et al

in International Journal of Primatology (2013)

Food availability may influence primates’ home range size and use. Understanding this relationship may facilitate the design of conservation strategies. We aimed to determine how fruit availability ... [more ▼]

Food availability may influence primates’ home range size and use. Understanding this relationship may facilitate the design of conservation strategies. We aimed to determine how fruit availability influences the ranging patterns of a group of northern pig-tailed macaques (Macaca leonina) living around the visitor center of Khao Yai National Park, Thailand. We predicted that macaques would increase their range during low fruit abundance periods to gather high-quality food and that they would go where there are more fruits or more fruits of particular species. We also predicted that human food, linked to human pre sence, would attract the macaques. We followed the macaques and recorded their diet and movements within their home range. We superimposed a grid on kernels defining the monthly home range surface to compare spatially macaques’ travel and the availability of fruits measured on botanical transects. Our results showed that the macaques increased their monthly home range in March, probably to obtain newly available fruits. During high fruit abundance seasons, they spent more time near particular fruit species. In August and September, although fruits became rare again, macaques kept their home range large, perhaps to find enough fruits as supplies dwindled. Finally, from October to February, they decreased their monthly home range size while consuming human food, a highquality item. In conclusion, the macaques used several ranging strategies according to fruit availability. however, we think that, without human food, macaques would tend to increase their range during low fruit abundance periods, as predicted. [less ▲]

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See detailThe influence of forest definition on landscape fragmentation assessment in Rondônia, Brazil
Colson, F; Bogaert, Jan ULg; Carneiro Filho, A. et al

in Ecological Indicators (2009), 9

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See detailInfluence of forest degradation on tree diversity in a forest-savannah transition in Eastern Ivory Coast
Barima, YSS; Angaman, MD; De Cannière, C et al

in International Journal of Biological and Chemical Sciences (2012), 6(4), 1467-1497

Detailed reference viewed: 29 (1 ULg)