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See detailEffect of different parameters on composition of volatile components of Myristica fragrans seeds extracted by hydrodistillation assisted by microwave and head-space solid-phase microextraction
Bouchachia, C; Benkaci-Ali, F; Eppe, Gauthier ULiege et al

in Journal of Essential Oil Research (in press)

Hydrodistillation assisted by microwave (HDAM) and Head space solid phase micro-extraction (HSSPME) of Myristica fragrans houtt (MF) were investigated. A kinetic study was performed for MF seeds using two ... [more ▼]

Hydrodistillation assisted by microwave (HDAM) and Head space solid phase micro-extraction (HSSPME) of Myristica fragrans houtt (MF) were investigated. A kinetic study was performed for MF seeds using two techniques (HDAM: Hydrodistillation assisted by microwave and SDAM: steam distillation assisted by microwave). The effect of the cryogenic grinding (CG) showed differences in yields and composition of volatile oils compared to the simple grinding (SG). HDAM–SG (3.4%) and SDAM–SG (2.55%) allowed extraction of substantial amounts of volatile oils in less time compared with HDAM–CG (4.75%) and SDAM–CG (3.8%). The kinetic study (differential and accumulated yields) of essential oil extraction was quantitatively and qualitatively performed showing a significant variation of composition with the extraction time, especially for accumulated yields such as sabinene (31.48–38.78%), α-pinene (12.74–14.09%) and β-pinene (10.01–12.11%). Similarly, the HS-SPME–GC–MS analysis showed also a significant variation of MF seeds volatile composition according some parameters as the type of fibre coating (PDMS: Polydimethylsiloxane and PDMS– DVB: Polydimethylsiloxane divenylbenzene), particle size, grinding mode and the mass used. The chemical groups (monoterpenoids, aliphatic and aromatic alcohols and esters) showed specific behaviour in SPME analysis. SPME sampling parameters were optimized for these components. [less ▲]

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See detailEffect of different prostaglandin treatment protocols on the time of ovulation and pregnancy rate in dairy cattle
Repasi, A.; Melo de Sousa, Noelita ULiege; Beckers, Jean-François ULiege et al

in Folia Veterinaria (2009), 53(Suppl. 2), 172

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See detailEffect of different protectants on viability of thermotolerant acetic acid bacterium Acetobacter sengalenisis
Shafiei, Rasoul ULiege; Thonart, Philippe ULiege

in Annual Confernace of the Association for general and applied microbiology (VAAM) (2011, April)

Production of vinegar at high temperature (>37° C) needs special processes and equipments; one of the key elements in the process, is the accessibility of active and stable starters. In this study the ... [more ▼]

Production of vinegar at high temperature (>37° C) needs special processes and equipments; one of the key elements in the process, is the accessibility of active and stable starters. In this study the influences of different cryo-protective agents on some steps (freezing, drying and storage) of starter production were investigated. To achieve this goal, Acetobacter senegalensis, was used as a thermotolerant acetic acid bacterium. Glucose was used as carbon source in fermentor to produce biomass. Different cryo-protectants (manitol (20%), glycerol (3%), sucrose (10%), trehalose (5%), glutamate (3%), maltodextrin (10%), skimmed milk (10%) and spent growth medium) were added to washed and unwashed biomass. The lyophilized cells (92-93% water content) were stored in darkness under different temperatures (-20° C, +4° C and 35° C). The viability of cells after rehydration, activity of glucose dehydrogenase, gluconate dehydrogenase and soluble protein contents were determined up to 6 months. According to the results, washing of cells by tap water has no effect on viability of cells during freezing and more than 97% of cells are alive in all treatments. After lyophilization, unwashed cells showed higher viability in all treatments in comparison to washed cells. On the basis of residual viable cells, manitol, maltodextrin, and spent growth medium showed the highest protective effects (92.3%, 88.2% and 82.1% survival, respectively) on cells during drying process whereas glycerol had the lowest protective effect on viability (15.4% survival). During storage of lyophilized cells at 35° C, 100% of cells are dead in all treatments after 15 days. Unwashed cells treated with manitol, maltodextrin and spent growth medium showed 79.2%, 68.3% and 62.7% viability, respectively after keeping at 4°C for 6 months. There is direct relationship between the soluble protein contents of cells and storage temperature. Cells stored at -20° C showed highest soluble protein contents after 6 months of storage while the lowest amount of soluble protein contents was detected in cells stored at 35° C. On the other hand, glucose dehydrogenase and gluconate dehydrogenase activities decreased during storage of cells at 4°C, whereas more than 90% of the enzymes activity remained during storage of different cells at -20° C, so it can be assumed that higher temperature can inactivate cell proteins. In conclusion, lyophilization of Acetobacter senegalensis by the mentioned methods can provide a promising and economic tool for production of stable and active vinegar starters. [less ▲]

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See detailEffect of different technological approaches on the optical properties of ZnO sol-gel thin films
Ivanova, T.; Harizanova, A.; Koutzarova, T. et al

in Journal of Physics: Conference Series (2014), 514

The work presents a sol-gel approach with two types of solvents for ZnO films deposition in view of varying the films' structural and optical properties. The ZnO films were characterized by X-Ray ... [more ▼]

The work presents a sol-gel approach with two types of solvents for ZnO films deposition in view of varying the films' structural and optical properties. The ZnO films were characterized by X-Ray diffraction (XRD) and found to have a polycrystalline wurtzite phase structure. The grain sizes and the lattice parameters were determined; it was established that the ZnO crystallites' size increases with the annealing temperatures from 25 nm to 36 nm. The ZnO films possess high transmittance in the visible spectral range. Further, the optical band gap values were estimated. The material's vibration properties were analyzed by Fourier Transform Infrared (FTIR) spectroscopy. The two technological sol-gel approaches for deposition of ZnO films, using two different solvents, proved to be successful in producing structures with different structural and optical properties. The thin films fabricated were very smooth and uniform and exhibited a high transparency in the visible spectral range. [less ▲]

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See detailEffect of different tillage systems on aggregate structure and inner distribution of organic carbon
Gao, Lili ULiege; Beckers, Eléonore ULiege; Liang, Guopeng et al

in Geoderma (2017), 288

Tillage is a common agricultural practice affecting soil structure and biogeochemistry. Pore network geometries are crucial to oxygen concentration, gas diffusivity, water location and water movement ... [more ▼]

Tillage is a common agricultural practice affecting soil structure and biogeochemistry. Pore network geometries are crucial to oxygen concentration, gas diffusivity, water location and water movement. Soil aggregates, 4–6 mm in diameter and collected from silty loam in Belgium and sandy loam in China, were scanned using a micro-computed tomography scanner. Images with a pixel size of 6.9 μm were then processed with ImageJ software for pore network analysis. The treatments were no tillage (C-NT) and conventional tillage (C-CT) in China, and shallow tillage (G-ST) and conventional tillage (G-CT) in Belgium. The results showed that aggregates in conservational tillage (G-ST and C-NT) had numerous connected pores compared with conventional tillage (G-CT and C-CT). The Euler number (Ev) was significantly lower and visible total porosity and surface area (SA) were significantly higher in conservational tillage (G-ST and C-NT) than in conventional tillage (G-CT and C-CT) in both studied locations. The predominant size of pores was significantly higher in conservational tillage (G-ST and C-NT) than in conventional tillage (G-CT and C-CT) (> 150 μm vs 90–120 μm). Pore location within the aggregates also showed differences, with porosity being evenly distributed in the aggregates under conventional tillage (G-CT and C-CT). Under conservational tillage (G-ST and C-NT), the aggregates were heterogeneous, showing higher porosity at the center of the aggregates. There was a higher soil organic carbon (SOC) content in the external layer than in the internal layer in conservational tillage in Belgium (G-ST). In no tillage in China (C-NT), the SOC in the external and internal layers, however, showed similar results. Overall, conventional tillage (G-CT and C-CT) reduced the proportion of the largest pores within soil aggregates, whereas there was no significant relationship between pore morphologies and SOC content. Further investigation is required to measure the active and slow carbon pool distribution in the different layers and under different tillage practices. [less ▲]

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See detailEffect of different treatment protocols on ovulation and pregnancy rate in dairy cattle.
Repasy, A.; Melo de Sousa, Noelita ULiege; Beckers, Jean-François ULiege et al

in Magyar Allatorvosok Lapja = Hungarian Veterinary Journal (2008), (Suppl II), 314

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See detailEFFECT OF DIFFERENT WARMING-UP PROTOCOLS ON TIME TO EXHAUSTION AT MAXIMAL AEROBIC SPEED
Rodriguez de la Cruz, Carlos ULiege; Brennenraedts, C.; Bury, Thierry ULiege

in British Journal of Sports Medicine (2011), 45

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See detailEffect of digital nerve stimuli on responses to electrical or magnetic stimulation of the human brain.
MAERTENS DE NOORDHOUT, Alain ULiege; Rothwell, J. C.; Day, B. L. et al

in Journal of Physiology (1992), 447

1. Reflexes were elicited in the first dorsal interosseous muscle of seven normal subjects by electrical stimulation of the digital nerves of the index finger at 3 times perceptual threshold while ... [more ▼]

1. Reflexes were elicited in the first dorsal interosseous muscle of seven normal subjects by electrical stimulation of the digital nerves of the index finger at 3 times perceptual threshold while subjects maintained a constant voluntary contraction of the muscle. The average response in the surface-rectified electromyogram (EMG) consisted of an early inhibitory (I1) component followed by a later excitation (E2). 2. Low intensity anodal electrical or magnetic scalp stimuli were given over the motor cortex in order to elicit muscle responses within the period of the I1 and E2 reflex components. 3. Compared with control responses elicited in the absence of digital nerve stimulation, responses to electrical cortex stimulation were suppressed in the I1 period and facilitated during the E2 period of the reflex. In contrast, responses evoked by magnetic stimulation were suppressed during I1 and also for the first 10 ms or so of the E2 response. Magnetically evoked responses were facilitated during the later part of the E2 reflex. 4. Similar effects were seen when the probability of firing of single motor units was studied. 5. In three subjects, small taps were given to the abducted index finger in order to stretch the first dorsal interosseous muscle and evoke reflexes which were of comparable size to the E2 reflex evoked by digital nerve stimulation. In contrast to the experiments in which digital nerve stimuli were given, responses evoked by magnetic stimulation over motor cortex were facilitated at all times during the course of the reflex evoked when the muscle was stretched. 6. We conclude that single electrical stimuli applied to the digital nerves can reduce for a short period the excitability of motor cortex to magnetic stimulation. This occurs at a time when the same stimulus is evoking an excitatory (E2) reflex in the average surface-rectified EMG. [less ▲]

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See detailThe effect of dispersion and atomisation conditions on the compaction response of silicon nitride granules
Destoop, Vincent; Mertens, Anne ULiege; Hendrix, W. et al

in Key Engineering Materials [=KEM] (1997), 132-136

The relationship between the dispersion conditions of silicon nitride slurries and the compaction behaviour of spray dried granules is reported in the case of two commercial powders. Two parameters have ... [more ▼]

The relationship between the dispersion conditions of silicon nitride slurries and the compaction behaviour of spray dried granules is reported in the case of two commercial powders. Two parameters have been retained: the solid loading, varied between 10 and 30 vol.% and the degree of stability of the suspension, controlled by adjustment of the pH. [less ▲]

Detailed reference viewed: 79 (5 ULiège)
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See detailEffect of DNA photosensitization mediated by promazine derivatives on transcription in vitro
Decuyper, J.; Piette, Jacques ULiege; Rentier, Bernard ULiege et al

in Archives Internationales de Physiologie, de Biochimie et de Biophysique (1984), 92(2), 18

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See detailEffect of DOPA and dopamine coupling on protein loading of hydroxyapatite
Ozhukil Kollath, Vinayaraj ULiege; Mullens, Steven; Luyten, Jan et al

in Materials Technology: Advanced Performance Materials (2016)

Hydroxyapatite (HA) is a promising carrier material for oral delivery of biomolecules such as proteins and drugs. Ways to increase the loading of such molecules on HA will lead to better nanomedicine ... [more ▼]

Hydroxyapatite (HA) is a promising carrier material for oral delivery of biomolecules such as proteins and drugs. Ways to increase the loading of such molecules on HA will lead to better nanomedicine. This study reports the surface functionalisation of HA particles using the mussel inspired molecules dopamine (DA) and 3,4-dihydroxy-L-phenylalanine (DOPA), in order to increase protein loading. The adsorption mechanisms are discussed based on the adsorption isotherms, zeta potential, thermal analysis and theoretical models. Results show that DA functionalisation enhanced the loading, while DOPA functionalisation was ineffective. [less ▲]

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See detailEffect of dopamine and baclofen on N-methyl-D-aspartate-induced burst firing in rat ventral tegmental neurons.
Seutin, Vincent ULiege; Johnson, S. W.; North, R. A.

in Neuroscience (1994), 58(1), 201-6

Intracellular microelectrode recordings were made from dopamine-containing neurons of the ventral tegmental area or substantia nigra zona compacta in rat brain slices in vitro. The firing pattern of the ... [more ▼]

Intracellular microelectrode recordings were made from dopamine-containing neurons of the ventral tegmental area or substantia nigra zona compacta in rat brain slices in vitro. The firing pattern of the neurons was switched from a tonic, single-spike pattern to a burst firing mode by adding N-methyl-D-aspartate (20 microM) to the superfusing solution; after adding tetrodotoxin the membrane potential underwent rhythmical oscillations of 20-40 mV at 0.5-2 Hz. Baclofen (1 microM) and dopamine (30 microM) hyperpolarized the neurons; when the potential was restored to its original level, the oscillations of potential and/or burst firing were not observed, but the tonic firing pattern was restored. These effects of baclofen and dopamine were prevented by barium (1 mM), which also prevented the membrane hyperpolarization. Oscillations of membrane current of a similar frequency were observed when the somatic membrane was voltage-clamped at -60 mV; these were also blocked by barium (1 mM). It is concluded that the oscillations in membrane potential observed with N-methyl-D-aspartate are generated predominantly at a dendritic location which is not voltage-clamped with an electrode at the soma. Baclofen and dopamine inhibit the oscillations by increasing the potassium conductance and hyperpolarizing the dendrites. [less ▲]

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See detailEffect of drug candidates for the treatment of Alzheimer's disorber on hippocampus-dependent learning, glutamate receptors and mitochondria
Vignisse, Julie ULiege; Steinbusch, H.W.M; Bolkunov, A. et al

Conference (2011, November 12)

Detailed reference viewed: 9 (0 ULiège)
See detailEffect of dry ultra-fine reduction on physico-chemical properties of pea starch
Jacqmin, S.; Paquot, Michel ULiege

in Food macromolecules and colloids adited by E-Dickinson and and D. Lorient, The royal Society of chemistry (1995)

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See detailEffect of drying and long term conservation on bioremediation properties of Rhodococcus erythropolis
Weekers, F.; Jacques, Philippe ULiege; Springael, D. et al

in Mededelingen van de Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen (Rijksuniversiteit te Gent) (1997), 62/4b

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See detailEffect of drying and long term conservation on bioremediation properties of Rhodococcus erythropolis.
Weekers, F.; Jacques, Philippe ULiege; Springael, D. et al

in Mededelingen - Faculteit Landbouwwetenschappen, Rijksuniversiteit Gent (1994), 62(4b),

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See detailEffect of drying methods on physico-chemical and antioxidant properties of date fibre concentrates
Borchani, I.; Besbes, S.; Masmoudi, M. et al

in Food Chemistry (2011), 125

Effects of different drying methods (freeze-, oven- and sun-drying) on physico-chemical properties of date fibre concentrates (DFC) from three potential Tunisian cultivars were investigated. DFC had high ... [more ▼]

Effects of different drying methods (freeze-, oven- and sun-drying) on physico-chemical properties of date fibre concentrates (DFC) from three potential Tunisian cultivars were investigated. DFC had high contents of dietary fibre (71.01–93.46% dry matter), with high proportions of insoluble dietary fibre. Freeze dried DFC had the highest values of swelling, water holding and oil holding capacities. This drying method gave also the lightest DFC colour. Kentichi fibre produced by freeze-drying had the highest viscosity and the lowest bulkier particles. The present work assessed polyphenol content and antioxidant activity of DFC using 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The highest polyphenol content was found for freeze dried DFC, contrary to radical scavenging activity which was not affected by drying methods. Results suggest that freeze dried DFC had the highest potential to be used as a functional ingredient in food products. [less ▲]

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See detailEffect of drying methods on physico-chemical and functional properties of chickpea protein concentrates
Ghribi, Abir Mokni; Maklouf Gafsi, Ines; Blecker, Christophe ULiege et al

in Journal of Food Engineering (2015), 165

Chickpea protein concentrates (CPCs) were prepared from seed flour by alkaline extraction followed by isoelectric precipitation. The effects of different drying methods (freeze drying and convective ... [more ▼]

Chickpea protein concentrates (CPCs) were prepared from seed flour by alkaline extraction followed by isoelectric precipitation. The effects of different drying methods (freeze drying and convective drying at 40 °C and 50 °C) on physico-chemical and functional properties of CPCs were investigated. CPCs were found to have high contents of protein (61.20–63.12% dry weight basis). Freeze dried concentrate had the highest values of water and oil holding capacities. This drying method gave the lightest CPCs color. The amino acid of CPCs could reach the FAO/WHO requirement (1990) for the essential amino acids for preschool children and the sulfur-containing amino acids were the first limiting amino acids for all three protein concentrates. The solubility-pH profile of different CPCs showed minimum solubility when the pH was between 4.0 and 5.0. All concentrates were able to decrease the interfacial tension. The thermal properties of CPCs were studied by differential scanning calorimetry. CPCs differed significantly (p ≤ 0.05) in peak denaturation temperature and enthalpy of transition. Hence, drying methods used for the preparation of CPCs powders can affect the physico-chemical and functional properties. [less ▲]

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See detailEffect Of Drying On Bioremediation Bacteria Properties
Weekers, F.; Jacques, Philippe ULiege; Springael, D. et al

in Applied Biochemistry and Biotechnology (1998), 70-2

Detailed reference viewed: 14 (1 ULiège)