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See detailComparison of monoamine concentrations in the brains of adult male and female Japanese quail.
Ottinger, M. A.; Schumacher, M.; Clarke, R. N. et al

in Poultry Science (1986), 65(7), 1413-20

A fluorometric assay measuring brain tissue concentrations of norepinephrine, dopamine, and serotonin has been validated for Japanese quail. Accuracy, precision, specificity, and parallelism were ... [more ▼]

A fluorometric assay measuring brain tissue concentrations of norepinephrine, dopamine, and serotonin has been validated for Japanese quail. Accuracy, precision, specificity, and parallelism were determined. The sensitivity of the assays was 6 ng/tube, which allowed individual assay of 1 to 2 mg hypothalamic tissue. In Experiment 1, relatively large areas of brain from adult, reproductively active males and females were found to differ significantly in norepinephrine content in optic lobes and for dopamine in right telencephalon. A microdissection technique was used in Experiment 2 to sample small portions of hypothalamic tissue. Sex differences were observed for norepinephrine in the sections containing the lobus paraolfactorius and the preoptic, anterior, and medial hypothalamus. Differences in monoamine content were most apparent when smaller areas dissected by microdissection were analyzed. These results give evidence for sex differences in the monoamine content in specific areas of the brain. [less ▲]

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See detailComparison of monooxygenase activities and cytochrome P-450 isozyme concentrations in human liver microsomes.
Beaune, P H; Kremers, P G; Kaminsky, L S et al

in Drug Metabolism and Disposition : The Biological Fate of Chemicals (1986), 14(4), 437-42

Concentrations of three human liver microsomal cytochrome P-450 isozymes and 20 different monooxygenase activities were determined in human liver microsomal preparations. The results of correlation ... [more ▼]

Concentrations of three human liver microsomal cytochrome P-450 isozymes and 20 different monooxygenase activities were determined in human liver microsomal preparations. The results of correlation analysis suggest that: there are important variations in the amounts of the three cytochrome P-450 isozymes measured, particularly P-450(8) and P-450(9); aldrin epoxidase, d-benzphetamine N-demethylase, and S-warfarin 4-hydroxylase activities are linked to cytochrome P-450(5); aryl hydrocarbon (benzo(a)pyrene) hydroxylase and 4-nitroanisole-O-demethylase activities are linked to P-450(8); hydroxylations at the 4'-, 6-, 7-, and 8-positions of R-warfarin are closely linked to each other but are not correlated with other measured monooxygenase activities or P-450 isozyme levels; and P-450(9) is not related to any of the catalytic activities tested. Thus, certain monooxygenase activities can be attributed to specific cytochrome P-450 isozymes. This approach should be useful in suggesting the roles of different cytochromes P-450 in drug metabolism in man which can be further examined using in vitro and in vivo methods. [less ▲]

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See detailComparison of moving boundary and finite-volume heat exchanger models in Modelica language
Desideri, Adriano ULg; Dechesne, Bertrand ULg; Wronski, Jorrit et al

in 3rd International seminar on ORC power systems, Brussels 12-14 October 2015 (2015)

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See detailComparison of Moving Boundary and Finite-Volume Heat Exchanger Models in the Modelica Language
Desideri, Adriano ULg; Dechesne, Bertrand ULg; Wronski, Jorrit et al

in energies (2016)

When modeling low capacity energy systems, such as a small size (5–150kWel) organic Rankine cycle unit, the governing dynamics are mainly concentrated in the heat exchangers. As a consequence, the ... [more ▼]

When modeling low capacity energy systems, such as a small size (5–150kWel) organic Rankine cycle unit, the governing dynamics are mainly concentrated in the heat exchangers. As a consequence, the accuracy and simulation speed of the higher level system model mainly depend on the heat exchanger model formulation. In particular, the modeling of thermo-flow systems characterized by evaporation or condensation requires heat exchanger models capable of handling phase transitions. To this aim, the finite volume (FV) and the moving boundary (MB) approaches are the most widely used. The two models are developed and included in the open-source ThermoCycle Modelica library. In this contribution, a comparison between the two approaches is presented. An integrity and accuracy test is designed to evaluate the performance of the FV and MB models during transient conditions. In order to analyze how the two modeling approaches perform when integrated at a system level, two organic Rankine cycle (ORC) system models are built using the FV and the MB evaporator model, and their responses are compared against experimental data collected on an 11kWel ORC power unit. Additionally, the effect of the void fraction value in the MB evaporator model and of the number of control volumes (CVs) in the FV one is investigated. The results allow drawing general guidelines for the development of heat exchanger dynamic models involving two-phase flows. [less ▲]

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See detailComparison of MRI images obtained at 7T in a dog to macroscopic and histopathological examination
Van Thielen, B.; Visser, F.; Denolin, V. et al

Poster (2010, July 20)

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See detailA comparison of multivariate genome-wide association methods.
Galesloot, Tessel E.; Van Steen, Kristel ULg; Kiemeney, Lambertus A. L. M. et al

in PloS one (2014), 9(4), 95923

Joint association analysis of multiple traits in a genome-wide association study (GWAS), i.e. a multivariate GWAS, offers several advantages over analyzing each trait in a separate GWAS. In this study we ... [more ▼]

Joint association analysis of multiple traits in a genome-wide association study (GWAS), i.e. a multivariate GWAS, offers several advantages over analyzing each trait in a separate GWAS. In this study we directly compared a number of multivariate GWAS methods using simulated data. We focused on six methods that are implemented in the software packages PLINK, SNPTEST, MultiPhen, BIMBAM, PCHAT and TATES, and also compared them to standard univariate GWAS, analysis of the first principal component of the traits, and meta-analysis of univariate results. We simulated data (N = 1000) for three quantitative traits and one bi-allelic quantitative trait locus (QTL), and varied the number of traits associated with the QTL (explained variance 0.1%), minor allele frequency of the QTL, residual correlation between the traits, and the sign of the correlation induced by the QTL relative to the residual correlation. We compared the power of the methods using empirically fixed significance thresholds (alpha = 0.05). Our results showed that the multivariate methods implemented in PLINK, SNPTEST, MultiPhen and BIMBAM performed best for the majority of the tested scenarios, with a notable increase in power for scenarios with an opposite sign of genetic and residual correlation. All multivariate analyses resulted in a higher power than univariate analyses, even when only one of the traits was associated with the QTL. Hence, use of multivariate GWAS methods can be recommended, even when genetic correlations between traits are weak. [less ▲]

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See detailComparison of muscle energetics during voluntary and electrically induced contractions in humans
Vanderthommen, Marc ULg; Duteil, S.; Wary, C. et al

in Rainoldi, A.; Minetto, M. A.; Merletti, R. (Eds.) Biomedical engineering in exercise and sports (2006)

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See detailA comparison of Nash equilibria analysis and agent-based modelling for power markets
Krause, Thilo; Beck, Elena Vdovina; Cherkaoui, Rachid et al

in International Journal of Electrical Power & Energy Systems (2006), 28(9), 599-607

In this paper we compare Nash equilibria analysis and agent-based modelling for assessing the market dynamics of network-constrained pool markets. Power suppliers submit their bids to the market place in ... [more ▼]

In this paper we compare Nash equilibria analysis and agent-based modelling for assessing the market dynamics of network-constrained pool markets. Power suppliers submit their bids to the market place in order to maximize their payoffs, where we apply reinforcement learning as a behavioral agent model. The market clearing mechanism is based on the locational marginal pricing scheme. Simulations are carried out on a benchmark power system. We show how the evolution of the agent-based approach relates to the existence of a unique Nash equilibrium or multiple equilibria in the system. Additionally, the parameter sensitivity of the results is discussed. (C) 2006 Elsevier Ltd. All rights reserved. [less ▲]

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See detailA comparison of Nash equilibria analysis and agent-based modelling for power markets
Krause, Thilo; Andersson, Goran; Ernst, Damien ULg et al

in Proceedings of the 15th Power System Computation Conference (PSCC 2005) (2005)

In this paper we compare Nash equilibria analysis and agent-based modelling for assessing the market dynamics of network-constrained pool markets. Power suppliers submit their bids to the market place in ... [more ▼]

In this paper we compare Nash equilibria analysis and agent-based modelling for assessing the market dynamics of network-constrained pool markets. Power suppliers submit their bids to the market place in order to maximize their payoffs, where we apply reinforcement learning as a behavioral agent model. The market clearing mechanism is based on the locational marginal pricing scheme. Simulations are carried out on a benchmark power system.We show how the evolution of the agent-based approach relates to the existence of a unique Nash equilibrium or multiple equilibria in the system. Additionally, the parameter sensitivity of the results is discussed. [less ▲]

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See detailComparison of native and inherited immunoglobulins in rabbits immunized against bovine pregnancy-associated glycoprotein-1 (boPAG-1).
Melo de Sousa, Noelita ULg; Banga-Mboko, H.; El Amiri, B. et al

in Pflügers Archiv : European Journal of Physiology (2000), 440

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See detailComparison of necrotoxigenic Escherichia coli isolates from farm animals and humans
Mainil, Jacques ULg; Jacquemin, E.; Pohl, P. et al

in Veterinary Microbiology (1999), 70

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See detailComparison of Neuromuscular Block of Atracurium and Rocuronium in Adults
Hans, Pol ULg; Brichant, Jean-François ULg; Franzen, A. et al

in Acta Anaesthesiologica Belgica (1996), 47(2), 53-8

We studied the time-course of action of atracurium 0.5 mg kg-1 and rocuronium 0.6 mg kg-1 in 24 healthy adult patients. Anesthesia was induced with thiopentone and sufentanil, and maintained with 50 ... [more ▼]

We studied the time-course of action of atracurium 0.5 mg kg-1 and rocuronium 0.6 mg kg-1 in 24 healthy adult patients. Anesthesia was induced with thiopentone and sufentanil, and maintained with 50% nitrous oxide and 1% enflurane in oxygen. Neuromuscular transmission was monitored by stimulating the ulnar nerve at the wrist and measuring the acceleration of the thumb using the TOF-Guard accelerograph monitor. Supramaximal stimuli of 0.2 ms duration were applied in a single twitch stimulation mode at 1 Hz frequency until completion of block, and in train-of four (TOF) sequence at 2 Hz every 15 sec thereafter. Onset time was longer with atracurium (mean +/- SD:90 +/- 18 sec) than with rocuronium (49 +/- 6 sec). Clinical duration of action (Tl25) was longer with atracurium (52.3 +/- 7.2 min) than with rocuronium (40.0 +/- 6.4 min). Recovery index (Tl25-Tl75) and time for TOF ratio to recover to 0.75 were 17.8 +/- 4.2 and 73.9 +/- 8.8 min with atracurium, and 13.8 +/- 4.1 and 70.4 +/- 14.1 min with rocuronium. The differences between both groups were statistically significant except the difference in the time for TOF to return to 0.75. [less ▲]

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See detailComparison of noise, hot and cold contrast of eight tomographic camera models.
Seret, Alain ULg; Nguyen, Thibaut

in European Journal of Nuclear Medicine and Molecular Imaging (2006), 33(S2), 282

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See detailComparison of non-linear growth models to describe the growth curve in West African Dwarf Sheep
Gbangboche, A. B.; Gleke-Kakai, R.; Albuquerque, L. G. et al

in Animal (2008), 2(7), 1003-1012

The objectives of this study were to compare the goodness of fit of four non-linear growth models, i.e. Brody, Gompertz, Logistic and Von Bertalanffy, in West African Dwarf (WAD) sheep. A total of 5274 ... [more ▼]

The objectives of this study were to compare the goodness of fit of four non-linear growth models, i.e. Brody, Gompertz, Logistic and Von Bertalanffy, in West African Dwarf (WAD) sheep. A total of 5274 monthly weight records from birth up to 180 days of age from 889 lambs, collected during 2001 to 2004 in Betecoucou breeding farm in Benin were used. In the preliminary analysis, the General Linear Model Procedure of the Statistical Analysis Systems Institute was applied to the dataset to identify the significant effects of the sex of lamb (male and female), type of birth (single and twin), season of birth (rainy season and dry season), parity of dam (1, 2 and 3) and year of birth (2001, 2002, 2003 and 2004) on the observed birth weight and monthly weight up to 6 months of age. The models parameters (A, B and k), coefficient of determination (R2), mean square error (MSE) were calculated using language of technical computing package Matlab􏰀 R , 2006. The mean values of A, B and k were substituted into each model to calculate the corresponding Akaike’s Information Criterion (AIC). Among the four growth functions, the Brody model has been selected for its accuracy of fit according to the higher R2, lower MSE and AIC. Finally, the parameters A, B and k were adjusted in Matlab􏰀 R , 2006 for the sex of lamb, year of birth, season of birth, birth type and the parity of ewe, providing a specific slope of the Brody growth curve. The results of this study suggest that Brody model can be useful for WAD sheep breeding in Betecoucou farm conditions through growth monitoring. [less ▲]

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See detailComparison of Nonlinear Domain Decomposition Schemes for Coupled Electromechanical Problems
Halbach, Alexandre ULg; Dular, Patrick ULg; Geuzaine, Christophe ULg

in IEEE Transactions on Magnetics (2016), 52(3),

The aim of this paper is to compare several domain decomposition schemes for nonlinear, coupled electromechanical problems. Both staggered and monolithic electrostatic/elastic formulations are considered ... [more ▼]

The aim of this paper is to compare several domain decomposition schemes for nonlinear, coupled electromechanical problems. Both staggered and monolithic electrostatic/elastic formulations are considered for the multiphysics problem. The domain decomposition is applied either to a single multiphysics iteration, which corresponds to a linear problem, or to the full nonlinear multiphysics resolution. In the latter, the problem solved at each domain decomposition iteration is nonlinear. The influence of the elastic wave’s frequency and the electrostatic potential on the convergence rate and the computational cost of the algorithm is investigated on a 2-D model of a vibrating micromembrane array. [less ▲]

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See detailComparison of Nonlinear Domain Decomposition Schemes for Coupled Electromechanical Problems
Halbach, Alexandre ULg; Dular, Patrick ULg; Geuzaine, Christophe ULg

in Proceedings of COMPUMAG 2015 (2015, June)

The aim of this paper is to compare several domain decomposition schemes for nonlinear, coupled electromechanical problems. Both staggered and monolithic electrostatic/elastic formulations are combined ... [more ▼]

The aim of this paper is to compare several domain decomposition schemes for nonlinear, coupled electromechanical problems. Both staggered and monolithic electrostatic/elastic formulations are combined with an overlapping domain decomposition method applied either to the uncoupled, linear staggered resolutions or to the monolithic nonlinear system. The influence of the elastic waves frequency, of the electrostatic potential and of the mesh on the convergence rate is investigated on a simple 2D model of a vibrating micromembrane array. [less ▲]

Detailed reference viewed: 44 (7 ULg)