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 detailDetermination of verapamil and norverapamil in human plasma by liquid chromatography: comparison between a liquid-liquid extraction procedure and an automated liquid-solid extraction method for sample preparation.
Hubert, Philippe ULg; Chiap, Patrice ULg; Ceccato, Attilio ULg et al

in Journal of Pharmaceutical & Biomedical Analysis (1992), 10(10-12), 937-42

A conventional liquid-liquid extraction (LLE) procedure with high-performance liquid chromatography (HPLC) has been developed for the determination of verapamil and its main metabolite, norverapamil, in ... [more ▼]

A conventional liquid-liquid extraction (LLE) procedure with high-performance liquid chromatography (HPLC) has been developed for the determination of verapamil and its main metabolite, norverapamil, in plasma. After addition of the internal standard, plasma samples were basified with phosphate buffer (pH 9.0) and extracted with a mixture of cyclohexane-dichloromethane. After centrifugation, the organic layer was separated and the analytes were extracted back into a 0.1 N sulphuric acid solution containing 2-aminoheptane. An aliquot of this aqueous phase was then injected directly onto the HPLC column. This LLE procedure has been compared with an automated liquid-solid extraction (LSE) method that has been developed in parallel. Good linearity was obtained using both extraction methods. The absolute recoveries for the two analytes were ca 95% with the automated LSE procedure and slightly lower (ca 84%) for the LLE method. The automated method gives better results with respect to detectability and precision, but the LLE procedure is simpler to develop, requires much less expensive equipment, and remains a useful alternative when the number of samples to be analysed is limited. [less ▲]

Detailed reference viewed: 72 (6 ULg)
Peer Reviewed
See detailDetermination of Vs-models for the Basel region: Comparison between Array measurements, SASW and S-wave reflection
Havenith, Hans-Balder ULg; Polom, Ulrich; Fäh, Donat et al

in Geophysical Research Abstracts (2006)

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailDetermination of water-soluble vitamins by capillary zone electrophoresis
Fotsing, Lucas ULg; Bechet, I.; Fillet, Marianne ULg et al

in Journal de Pharmacie de Belgique (1996), 51

Detailed reference viewed: 7 (2 ULg)
Full Text
Peer Reviewed
See detailDetermination of Zinc, Cadmium and Lead Bioavailability in Contaminated Soils at the Single-Cell Level by a Combination of Whole-Cell Biosensors and Flow Cytometry
Hurdebise, Quentin ULg; Tarayre, Cédric ULg; Fischer, Christophe ULg et al

in Sensors (2015)

Zinc, lead and cadmium are metallic trace elements (MTEs) that are widespread in the environment and tend to accumulate in soils because of their low mobility and non-degradability. The purpose of this ... [more ▼]

Zinc, lead and cadmium are metallic trace elements (MTEs) that are widespread in the environment and tend to accumulate in soils because of their low mobility and non-degradability. The purpose of this work is to evaluate the applicability of biosensors as tools able to provide data about the bioavailability of such MTEs in contaminated soils. Here, we tested the genetically-engineered strain Escherichia coli pPZntAgfp as a biosensor applicable to the detection of zinc, lead and cadmium by the biosynthesis of green fluorescent protein (GFP) accumulating inside the cells. Flow cytometry was used to investigate the fluorescence induced by the MTEs. A curvilinear response to zinc between 0 and 25 mg/L and another curvilinear response to cadmium between 0 and 1.5 mg/L were highlighted in liquid media, while lead did not produce exploitable results. The response relating to a Zn2+/Cd2+ ratio of 10 was further investigated. In these conditions, E. coli pPZntAgfp responded to cadmium only. Several contaminated soils with a Zn2+/Cd2+ ratio of 10 were analyzed with the biosensor, and the metallic concentrations were also measured by atomic absorption spectroscopy. Our results showed that E. coli pPZntAgfp could be used as a monitoring tool for contaminated soils being processed. [less ▲]

Detailed reference viewed: 69 (22 ULg)
Full Text
Peer Reviewed
See detailDétermination par analyse palynologique de l'âge Crétacé Inférieur de la mise en place du gisement de Barite de Fleurus. (Synclinorium de Namur, Belgique).
Dejonghe, L; Fairon-Demaret, M; Gauthier, B. et al

in Comptes rendus Académie des Sciences Paris (1987), 304(11/6), 227-232

Detailed reference viewed: 10 (2 ULg)
Full Text
See detailDétermination provisoire des constantes de la nutation diurne et de la nutation initiale
Folie, François ULg

in Annuaire de l'Observatoire Royal de Belgique (1890), 57

The author shows the necessary to consider the diurnal nutation in the writing of their astronomical observations.

Detailed reference viewed: 22 (0 ULg)
Peer Reviewed
See detailDetermination rapide par immunodosage de l'hemoglobine glyquee sur sang capillaire comparee a une methode d'affinite pour le boronate et capture d'ions sur sang veineux.
Bozet, Marie-Claire ULg; Gerard, Pascale ULg; Scheen, André ULg et al

in Annales de Biologie Clinique (1997), 55(2), 139-44

Measurement of glycosylated haemoglobin has become an essential tool in the management of diabetic patients. A recently developed device allows the rapid immuno-assay of HbA1c in 1 microliter capillary ... [more ▼]

Measurement of glycosylated haemoglobin has become an essential tool in the management of diabetic patients. A recently developed device allows the rapid immuno-assay of HbA1c in 1 microliter capillary blood obtained by a finger prick. In 100 ambulatory diabetic patients, we compared the results obtained with this method to those obtained in venous blood using a standard affinity chromatography laboratory method. Although both methods correlated (r = 0.88, p < 0.001), the mean +/- SD levels respectively obtained differed slightly (7.6 +/- 1.5 vs 79 +/- 1.4% p < 0.001). The 95% confidence interval of the difference was [-0.41. -0.14]. Considering a cut-off HbA1c value of 8%, as indicative of the need for treatment adjustment, 33 patients with the capillary blood immuno-assay method and 42 with the venous-blood affinity chromatography method were above that limit (Mc Nemar test, p < 0.05). In conclusion, the rapid assay of HbA1c in capillary blood can be useful for the management of some diabetic patients but the results are not readily exchangeable with those obtained from other standardized laboratory methods. Consequently, specific ranges and clinical decision limits must be determined. [less ▲]

Detailed reference viewed: 197 (0 ULg)
Full Text
Peer Reviewed
See detailThe determinations of household agricultural land use strategies in Red River Delta, Vietnam
Nguyen Thi, Dien; Vu Dinh, Ton; Lebailly, Philippe ULg et al

Conference (2014)

This research presents the determinations of household land use strategy in the context of the rapid rural changes due to the industrialization and urbanization in Vietnam. The mechanism that turns land ... [more ▼]

This research presents the determinations of household land use strategy in the context of the rapid rural changes due to the industrialization and urbanization in Vietnam. The mechanism that turns land to livelihood from both productive and non-productive processes is investigated to understand the different land use strategies of smallholders in Red River Delta region. Based on the presence of migrating members, the total selected 191 households in Hai Duong province were divided into 3 different groups to do the surveys. The research results show that local land use strategies are various in which 79.06% of surveyed households maintain the allocated land for agricultural production while 65.97% of households leave land idly at least once a year. The factors from productive process such as small landholding, high production cost and overall downward income from agricultural production meantime the greater opportunities from non-farm jobs are the main socio-economical determinations of agricultural land abandonment or less effective use. The security questions of shifting livelihood between farming and non – farming sectors, the inter-household arrangements, the social supports and the institutional constraints are non-productive elements that make the exchange and other forms of commercializing agricultural land are less prominent. The complexity of household land use strategy and its determinations not only reflects the dynamism and flexibility of peasant’s livelihood adaptation but also explain why the land concentration does not proceed faster in Red River Delta region of Vietnam. [less ▲]

Detailed reference viewed: 76 (4 ULg)
Full Text
Peer Reviewed
See detailDetermining Appropriate Amount of Redworm Meal Supplemented in the Diet of Broiler (Ho x Luong Phuong) in the Open Air Production System
Vu, Dinh Ton; Han Quang, Hanh ULg

in Journal of Science and development (2010), 8(6), 949-958

A study was carried out on 168 heads of broiler chicken (Ho x Luong Phuong) from 5 to 12 weeks of age to measure the effect of red worm meal (Perionyx excavatus) used as a rich protein feed in the diet on ... [more ▼]

A study was carried out on 168 heads of broiler chicken (Ho x Luong Phuong) from 5 to 12 weeks of age to measure the effect of red worm meal (Perionyx excavatus) used as a rich protein feed in the diet on growth performance, feed conversion and meat quality. Based on a completely randomized design, chickens were divided into four groups, involving a control group and three experimental groups corresponding to three levels of red worm meal, viz 8 and 6g/kg of feed (level 1), 13 and 10g/kg of feed (level 2), 18 and 14 g/kg of feed (level 3) according to two respectively growth periods of chicken (from 5 to 8 weeks of age and from 9 to 12 weeks of age. The results showed that supplementation of redworm meal with level 3 in the diets resulted in higher growth rate (P<0.05), lower feed consumption (reducing by 0.53 kg of feed/kg of weight gain, equal to 13.8%) and more improved of yellowness value (P<0.05) than those of control group. Adding redworm to chicken’s diets didn’t affect significantly other characteristics of meat quality (pH, drip and cooking loss, L* and a* values). If cost of worm is not calculated, feed price and feed cost per each kilogram of weight gain in group 3 will be reduced by 287 VND/kg and 4278 VND/kg, corresponding to 4.51% and 17.47% as compared with those of control one. [less ▲]

Detailed reference viewed: 156 (7 ULg)
Full Text
See detailDetermining fine population structure using iterative pruning
Chaichoompu, Kridsadakorn ULg; Yazew, Fentaw Abegaz; Tongsima, Sissades et al

Poster (2017, April 25)

Detailed reference viewed: 15 (2 ULg)
Full Text
See detailDetermining fine population structure using iterative pruning
Chaichoompu, Kridsadakorn ULg; Yazew, Fentaw Abegaz; Tongsima, Sissades et al

Poster (2017, July 10)

SNP-based information is used in several existing clustering methods to detect shared genetic ancestry or to identify population substructure (Price et al. 2006, Raj et al. 2016). Here, we present an ... [more ▼]

SNP-based information is used in several existing clustering methods to detect shared genetic ancestry or to identify population substructure (Price et al. 2006, Raj et al. 2016). Here, we present an unsupervised clustering algorithm called the iterative pruning method to capture population structure (IPCAPS). Our method supports ordinal data which can be applied directly to SNP data to identify fine-level population structure and it is built on the iterative pruning Principal Component Analysis (ipPCA) algorithm (Intarapanich et al. 2009). The IPCAPS involves an iterative process using multiple splits based on multivariate Gaussian mixture modeling of principal components and Clustering EM estimation as in Lebret et al. (2015). In each iteration, rough clusters and outliers are also identified using our own method called RubikClust. The fixation index (FST) is known to measure a distance between populations and FST = 0.001 may be said to be genetically distinct among the European populations (Tian et al. 2008, Huckins et al. 2014). To observe fine-level population structure using FST, we examined simulated scenarios of one population, 500-8,000 individuals, 5,000-10,000 independent SNPs in HWE (Balding and Nichols 1995), with 100 replicates for each scenario. The simulated SNPs were encoded as additive coding and there was no missing genotype generated. We introduced negative control by subjecting individuals to be separated into two groups using kmeans. We observed that FST values of divided groups were lower than 0.0008, which can be defined as the minimum FST to detect fine-level population structure. To evaluate the performance of our method, we tested different simulated data sets of 2-3 populations, 250 individuals per population, 10,000 independent SNPs in HWE, and FST=[0.0008,0.005], with 100 replicates for each data set. For real-life data sets, we applied the IPCAPS to Thai (Wangkumhang et al. 2013) and HapMap populations. Our method showed that a population classification accuracy was superior to the ipPCA in simulated scenarios of extremely subtle structure (FST=[0.0009,0.005]). In case of the Thai population, results to detect fine-level structure were obtained as well as in case of the HapMap populations. We are convinced that the IPCAPS has a potential to detect fine-level structure and it will be important in molecular reclassification studies of patients once underlying population structure has been removed. [less ▲]

Detailed reference viewed: 23 (2 ULg)
Full Text
Peer Reviewed
See detailDetermining new threshold temperatures for cooling and heating degree day index of different climatic zones of Iran
Roshan, Gh.R.; Ghanghermeh, A.A.; Attia, Shady ULg

in Renewable Energy : An International Journal (2016), 101(2017), 156-167

Iran is a country with a variety of different climates. Determining the threshold temperatures suitable for providing thermal and climatic comfort is necessary and vital to its population well-being. This ... [more ▼]

Iran is a country with a variety of different climates. Determining the threshold temperatures suitable for providing thermal and climatic comfort is necessary and vital to its population well-being. This research presents new threshold temperatures in order to calculate the degree day index required for heating and cooling by taking advantage of the 12 stations that are representative of the diversity of Iran's climate. Using Olgyay diagram, different bioclimatic ranges of 12 weather stations and their frequencies were compiled, processes and analysed. Mean daily data of temperature and relative humidity were used for the period of 1950e2010. Based on the frequencies of temperature readings falling in Olgyay's diagram comfort zone, representive temperature thresholds were selected based on 40 to 60 percentiles or (P20), 25e75% percentile (P50) and the threshold of 10e90% percentile. The findings of this study shows that Mashhad with 29.6% and Anzali with 2.33% of frequencies, have experienced the maximum and minimum days of comfort. After analyzing various percentiles to determine the threshold temperatures, it was observed that there is a little difference among the stations for determining the minimum threshold for the comfort. Differences are more obvious in the maximum thresholds. In total, minimum base temperatures (HDD) belonged to Ardabil stations that were 20.50, 20.90 and 20 deg C for P20, P50 and P80 respectively. The maximum temperature for calculating CDD with values of (P20 ¼ 25 C; P50 ¼ 26.25 C; P80 ¼ 27.50 C) is dedicated to Zabol station. The findings present more reasonable thermal comfort thresholds that can be used by architects, engineers and policy makers to achieve, in turn, more energy efficient homes and high quality indoor and outdoor living environments. [less ▲]

Detailed reference viewed: 53 (6 ULg)
Full Text
Peer Reviewed
See detailDetermining prevalence of chronic kidney disease using estimated glomerular filtration rate.
Delanaye, Pierre ULg; Cavalier, Etienne ULg; Krzesinski, Jean-Marie ULg

in JAMA : Journal of the American Medical Association (2008), 299(6), 631

Detailed reference viewed: 27 (6 ULg)
Full Text
See detailDetermining the characteristics of a free jet in 2-D by the SPH method
Lodomez, Maurine ULg

Master's dissertation (2014)

The Smoothed Particle Hydrodynamic method is a numerical method developed in 1977 to solve astrophysical problems. This numerical method is meshless, particle and Lagrangian and has been adapted to ... [more ▼]

The Smoothed Particle Hydrodynamic method is a numerical method developed in 1977 to solve astrophysical problems. This numerical method is meshless, particle and Lagrangian and has been adapted to hydraulic field. In this master’s thesis, the method is positioned relative to the classical numerical methods. The SPH formalism and its adaptation to hydraulic domain is exposed. The basics of SPH formalism are firstly the integral representation of a function and its derivative and secondly the particle approximation. The application of the SPH method to hydraulic domain is made by writting Navier Stokes equations in Lagrangian and SPH formalisms. Then, the specificities implemented in the code are tackled. These specificities are the state equation, the viscosity, the boundary conditions, the neighbors search and the problem initialization. Afterward, a modification of the initial didactic program, usable for constant domain in 3D, is performed. The changes are embodied to enable both 2D and 3D simulations with particle inflows and outflows. The validation of this modified code is performed thanks to four test cases. These test cases permit to validate the code and highlight the limitations of the method implemented such as kernel and the viscosity choices. Finally flows over sharped-crest weir have been simulated. These simulations were compared to results from the literature and experimental tests performed in the hydraulic laboratory. If some improvements are possible, such as injection and initialization of incoming particles, the results of these simulations show that the overall behavior of the free-jet is depicted. Indeed, the simulated jet admits a profile close to the experimental profiles. [less ▲]

Detailed reference viewed: 17 (6 ULg)
Full Text
See detailDetermining the competence of mountainous Mediterranean streams using lichenometric techniques
Gob, F.; Jacob, N.; Bravard, J. P. et al

in International Association of Hydrological Sciences : “River Catchment Dynamics : Natural Processes and Human Impacts (2005)

Detailed reference viewed: 17 (7 ULg)
Full Text
Peer Reviewed
See detailDetermining the Geographical Origin of a Serial Offender Considering the Temporal Uncertainty of the Recorded Crime Data
Trotta, Marie ULg; Bidaine, Benoît ULg; Donnay, Jean-Paul ULg

in GEOProcessing 2011 : The Third International Conference on Advanced Geographic Information Systems, Applications, and Services (2011, February)

Since the days the investigating officers used ”pin maps” to locate and to think about crime events, crime mapping has become widespread thanks to spatial analysis mainly supplied by GIS-like software. In ... [more ▼]

Since the days the investigating officers used ”pin maps” to locate and to think about crime events, crime mapping has become widespread thanks to spatial analysis mainly supplied by GIS-like software. In particular these methods suit well to geographic profiling devoted to crime series characterised by a single offender and hence limited space and time variability. Although spatial techniques are now regularly performed to delineate an offender’s area of residence, the temporal dimension is underemployed due to the wider uncertainty of time records. This paper proposes a methodology based on a least-squares adjustment in order to cope with this temporal issue for determining the most probable offender’s residence. Moreover, a chi-square test is described to check the significance of the solutions suggested by the method. The process is carried out on the real road network which has been discretised (rasterised) for computing convenience. Three simulations show the validity of the reasoning. Finally the main time and speed assumptions introduced in the model are discussed paving the way for further research. [less ▲]

Detailed reference viewed: 362 (84 ULg)
Full Text
See detailDetermining the reactivity of concrete aggregates for Nuclear Power Plant concrete structures
Jackiewicz-Rek, Wioletta; Piotrowski, Tomasz; Courard, Luc ULg et al

in Budowa Elektowni Jadrowych (2016), 529(9), 99-102

The authors describe the additional requirements to ensure durability of concrete related to probability of corrosion due to alkali-silica reactivity of aggregates based on French Rules for Design and ... [more ▼]

The authors describe the additional requirements to ensure durability of concrete related to probability of corrosion due to alkali-silica reactivity of aggregates based on French Rules for Design and Construction of PWR nuclear civil works RCC-CW. Since these requirements are based both on European standards and the French experience they are not fully compatible with the conditions and requirements in other countries, including Poland. In the paper the RILEM methodology and assessment according to American ASTM standards are presented as well. The article is an introduction to the discussion on adapting to Polish conditions the guidelines for the reactivity assessment of aggregate for concrete resulting from RCC-CW. [less ▲]

Detailed reference viewed: 19 (3 ULg)