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See detailLectotypification of the Famennian pre-ovule Condrusia rumex Stockmans, 1948
Prestianni, Cyrille ULg; Gerrienne, Philippe ULg

in Review of Palaeobotany and Palynology (2006), 142(3-4), 161-164

Condrusia rumex Stockmans 1948 occurs in several localities of the Belgian Evieux Formation (late Famennian, Upper Devonian). It consists of a hastate organ borne at the tip of "slender, dichotomizing ... [more ▼]

Condrusia rumex Stockmans 1948 occurs in several localities of the Belgian Evieux Formation (late Famennian, Upper Devonian). It consists of a hastate organ borne at the tip of "slender, dichotomizing" axes. Various interpretations have been given to this intriguing structure, ranging from a spore-bearing organ to a fern prothallus but recent investigations consider Condrusia to be an ovulate structures produced by early seed plants. The genus Condrusia includes 3 species: C rumex Stockmans, C. minor Stockmans and C. brevis Petrosjan. C rumex was described by Stockmans in 1948, who provided a diagnosis and illustrations, but failed to designate a holotype. We are currently reinvestigating the genus and we here designate and illustrate a lectotype for the genus and species C. rumex. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailTreating gliomas with glucocorticoids: from bedside to bench
Piette, Caroline ULg; Munaut, Carine ULg; Foidart, Jean-Michel ULg et al

in Acta Neuropathologica (2006), 112(6), 651-664

Glucocorticoids are used in the treatment of gliomas to decrease tumour-associated oedema and to reduce the risk of acute encephalopathy associated with radiotherapy. However, the mechanisms by which ... [more ▼]

Glucocorticoids are used in the treatment of gliomas to decrease tumour-associated oedema and to reduce the risk of acute encephalopathy associated with radiotherapy. However, the mechanisms by which glucocorticoids work are still largely unknown. In this paper, we survey the experimental and clinical evidence for the effects of glucocorticoids on tumour cell proliferation, apoptosis and sensitivity to chemotherapy, angiogenesis and vascular permeability. We then review current guidelines on the choice of molecule, dose and duration of glucocorticoid treatment for gliomas. [less ▲]

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See detailBulletin de la Société Voltaire n°12
Tilkin, Françoise ULg

E-print/Working paper (2006)

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See detailModeling and simulation of an air conditioning chilled water system
Lebrun, Jean ULg; Lemort, Vincent ULg; Teodorese, Ion

(2006, December)

This paper is giving an overview of problems encountered and solutions available for the simulation of an air conditioning system. Focus is given on the chilling water subsystem (from the chiller to the ... [more ▼]

This paper is giving an overview of problems encountered and solutions available for the simulation of an air conditioning system. Focus is given on the chilling water subsystem (from the chiller to the cooling coil). Main component simulation models (chillers, pumps, piping, valves, cooling coils and fans) are presented; they are tuned on manufacturer’s catalogue data. The way of integrating these models into a global HVAC system simulation is illustrated thanks to one example: the simulation of (a part of) a real chilled water loop, which is submitted to an exhaustive monitoring. Cooling demands and corresponding energy consumptions are systematically simulated and measured on one-minute time basis. This provides the opportunity for a global checking of the simulation by comparing simulated and measured cooling coil outputs. Further work should also include comparisons on chiller consumptions. [less ▲]

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See detailResults towards identifiability properties of biochemical reaction networks
Farina, Marcello; Findeisen, Rolf; Bullinger, Eric ULg et al

in Proc. of the 45th IEEE Conference on Decision and Control, San Diego, USA (2006, December)

In this paper we consider the question of parameter identifiability for biochemical reaction networks, as typically encountered in systems biology. Specifically, we are interested in deriving conditions ... [more ▼]

In this paper we consider the question of parameter identifiability for biochemical reaction networks, as typically encountered in systems biology. Specifically, we are interested in deriving conditions on the biochemical reaction network and on the measured outputs that guarantee identifiability of the parameters. Taking the specific system structure of biochemical reaction networks into account, we derive sufficient conditions for local parameter identifiability based on a suitable system expansion which does not any more directly depend on the parameters. Rather, as shown, the problem of identifiability can be recast as the question of observability of the (parameter free) expanded system. The conditions derived are exemplified considering a simple example [less ▲]

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See detailA contribution to the audit of an air-conditioning system: modeling, simulation and benchmarking
Adam, Christophe; Andre, Philippe ULg; Hannay, Cleide et al

(2006, December)

This paper intends to show how benchmarks can help in the audit of a HVAC system and how these benchmarks can be generated. The work presented is part of the European “AUDITAC” project. How can an auditor ... [more ▼]

This paper intends to show how benchmarks can help in the audit of a HVAC system and how these benchmarks can be generated. The work presented is part of the European “AUDITAC” project. How can an auditor declare that a given HVAC is “consuming too much”? He can’t make any judgment, if not having some reference, i.e. some “benchmarks” available. Focus is given here to cooling regime, but even then, heating cannot be forgotten (for example, the remaining heating demand can be satisfied thanks some recovery on the condensers of the chillers). The dramatic question is: what should be the consumption(s) for such a building, in such a climate, with such occupancy, such internal loads and such actual indoor environment? Better than to look for a (very hypothetical) global weather index, similar to heating degree-days, it seems more rational to run a simulation model on a few thousands of hours, corresponding to one (or to several) cooling season(s). Current performances of simulation tools make this approach very expedient. The climate can then be considered as it is, without any simplification. The main simplification is still welcome on the system (building + HVAC) side, in order to get calculation robustness, easy understanding and easy parameter identification. In this perspective, the building has to be subdivided in a very limited number of zones and only a few components of the HVAC system have to be included in the simulation model, with as simple as possible control strategies. [less ▲]

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See detailTRANSMISSION ET RÉSISTANCE DES PRIONS : LA PRATIQUE DE LA MÉDECINE DENTAIRE EN SERA T-ELLEAFFECTÉE ?
Elmoualij, Benaïssa ULg; Heinen, Ernst ULg; Zorzi, Willy ULg et al

in Journal de l'Ordre des Dentistes du Québec (2006), 43(9), 461-467

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See detailFrom model validation to production of reference simulations: how to increase reliability and applicability of building and HVAC simulation models
Adam, Christophe; Andre, Philippe ULg; Georges, Bernard ULg et al

(2006, December)

Validation of simulation models appears from a long time as a key issue in order to promote a more intensive and more efficient use of simulation models in the field of building and HVAC simulation. IEA ... [more ▼]

Validation of simulation models appears from a long time as a key issue in order to promote a more intensive and more efficient use of simulation models in the field of building and HVAC simulation. IEA Annex 34/43 originally targeted a number of specific applications where a more advanced validation was required: ground coupling problems, multizone building, shading, day lighting and cooling load interaction, HVAC components and ventilated facades. These validation exercises were built on the large methodological experience obtained in previous projects and address sometimes very fundamental problems of heat transfer in buildings. Consulting engineers and practitioners might see these exercises as a bit too far from their objectives and it is the reason why an additional activity was proposed with the specific aim of producing, based upon the results of the validation of models, a set of reference simulations. These applications cover a range of building types (residential, commercial) and systems (production, distribution emission) and run in a variety of climates. The paper will describe how models dedicated to these applications were developed, starting from validation results, going through the selection and consolidation of simulation hypothesises and ending with a number that might be considered as reference for the concerned applications. The paper will concentrate on models required by a residential building application (multizone building equipped with a heat pump or a condensing boiler). Simulations make use of both EES and TRNSYS software and both software are applied in parallel as far as possible in the different applications in order to get a better judgment of their potential advantages and drawbacks. The use of reference simulations in view of qualifying normative methods currently in development in the frame of the European Energy Performance in Buildings Directive is also addressed and demonstrated in the paper. [less ▲]

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See detailMolecular cloning and functional expression of a new aphid isoprenyl diphosphate synthase
Vandermoten, Sophie ULg; Beliveau, C.; Sen, S. et al

in Archives Internationales de Physiologie et de Biochimie (2006, December), 190

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See detailLe cas clinique du mois. Syndrome malin des neuroleptiques et paralysie generale
Foatelli, F. M.; gernay, p; Lievens, Isabelle ULg et al

in Revue Médicale de Liège (2006), 61(12), 807-11

Described in 1960 by Jean Delay in relation to the use of haloperidol, neuroleptic malignant syndrome remains relatively rare, and poorly known by the medical profession. The emergence of the atypical ... [more ▼]

Described in 1960 by Jean Delay in relation to the use of haloperidol, neuroleptic malignant syndrome remains relatively rare, and poorly known by the medical profession. The emergence of the atypical antipsychotic agents and preventive measures which have become general in recent years in hospital departments using dopamine receptor antagonists has not altered the prognosis, which remains potentially fatal in approximately a quarter of cases. This article proposes a descriptive summary of this syndrome in terms of clinical and biological diagnostics as well as of evolution, epidemiology, differential diagnosis and treatment. It describes the case of a patient affected by general paralysis having developed a neuroleptic malignant syndrome, thus the hypothesis what the neuroleptic malignant syndrome preferentially arises in subjects having underlying organic or metabolic problems and provides food for thought regarding the main medical and psychiatric overlaps, the use of dopaminergic agents and the behaviour to be adopted when dealing with a patient presenting with inaugural psychiatric symptomatology. [less ▲]

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See detail18f-Fdg Pet Imaging in Assessing Exudative Pleural Effusions
DUYSINX, Bernard ULg; Larock, Marie-Paule ULg; Nguyen, Delphine et al

in Nuclear Medicine Communications (2006), 27(12), 971-6

BACKGROUND: This study evaluates the accuracy of [F]fluorodeoxyglucose positron emission tomography (F-FDG PET) imaging with semi-quantitative analysis for differentiating benign from malignant pleural ... [more ▼]

BACKGROUND: This study evaluates the accuracy of [F]fluorodeoxyglucose positron emission tomography (F-FDG PET) imaging with semi-quantitative analysis for differentiating benign from malignant pleural exudates and for guiding the search for the primary tumour of pleural metastases. METHODS: Whole-body 18F-FDG PET was performed in 79 patients with exudative pleurisy. Standard uptake values were normalized for body weight, body surface area, lean body mass (SUVbw, SUVbsa, SUVlbm) with and without correction for blood glucose levels. Thoracoscopy was systematically performed to reveal pathological diagnosis. RESULTS: All SUVs were significantly higher in all malignant pleural diseases (n = 51) than in benign (n = 28) (P < 0.001). Moreover SUVs were greater in the pleural metastases from pulmonary primaries (n = 25) and in mesotheliomas (n = 8) than in extrathoracic primaries (n = 18) (P < 0.01) with no significant difference between lung cancers and mesotheliomas. Receiver operating curve (ROC) analysis between benign and malignant lesions showed areas under the curves that ranged from 0.803 (SUVbsa g) to 0.863 (SUVbw). The cut-off value for SUVbw which gave the best accuracy (82.3%) was 2.2. When comparing thoracic with extrathoracic primaries the highest accuracy (80.4%) was found for a cut-off value of 2.6. CONCLUSION: Semi-quantitative analysis of 18F-FDG PET imaging helps to differentiate malignant from benign pleural exudates and to distinguish between thoracic or extrathoracic primaries. [less ▲]

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See detailA numerical comparison of control strategies applied to an existing ice storage system
Lemort, Vincent ULg

in Energy Conversion and Management (2006), 47(20), 3619-3631

While ice storage systems are designed according to a defined strategy for warm day loads, it is interesting to consider other conventional control strategies for mid-season day loads. Three different ... [more ▼]

While ice storage systems are designed according to a defined strategy for warm day loads, it is interesting to consider other conventional control strategies for mid-season day loads. Three different charging-discharging control strategies are applied to an existing cooling plant and compared in terms of operating costs and energy consumption. A cooling plant model is built. A time stage equal to 15 min is considered to simulate numerically a whole charging-discharging process and compare the different control strategies. These simulations take into account existing technical constraints and set points. EES software is used. The operating costs of the cooling plant are evaluated by taking into account both the energy and the demand cost rate. It is shown that an ice storage system can allow savings of operating costs. However, they can increase energy consumption. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

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See detailRetarder la sclérose osseuse.
Henrotin, Yves ULg

Article for general public (2006)

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See detailEntre méfiance et intégration. Les germanophones dans l'armée belge (1920-1955)
Brüll, Christoph ULg

in Cahiers Belges d'Histoire Militaire (2006), 4

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See detailEnCOrE : Encyclopédie de Chimie Organique Electronique
Colaux, Catherine ULg; krief, Alain

Poster (2006, December)

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See detailInżyneria powierzchni betonu. Część 2. Wpływ obrobki na powstawanie rys
Courard, Luc ULg; Garbacz, Andrzej; Nieweglowska, Anna et al

in Materialy Budowlane (2006), 12

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See detailDeployment of an Algorithm for Large-Scale Topology Discovery
Donnet, Benoît ULg; Raoult, Philippe; Friedman, Timur et al

in IEEE Journal on Selected Areas In Communications (2006), 24(12), 2210--2220

Topology discovery systems are starting to be in- troduced in the form of easily and widely deployed software. Unfortunately, the research community has not examined the problem of how to perform such ... [more ▼]

Topology discovery systems are starting to be in- troduced in the form of easily and widely deployed software. Unfortunately, the research community has not examined the problem of how to perform such measurements efficiently and in a network-friendly manner. This paper describes several contributions towards that end. These were first presented in the proceedings of ACM SIGMETRICS 2005. We show that standard topology discovery methods (e.g., skitter) are quite inefficient, repeatedly probing the same interfaces. This is a concern, because when scaled up, such methods will generate so much traffic that they will begin to resemble DDoS attacks. We propose two metrics focusing on redundancy in probing and show that both are important. We also propose and evaluate Doubletree, an algorithm that strongly reduces redundancy while maintaining nearly the same level of node and link coverage. The key ideas are to exploit the tree-like structure of routes to and from a single point in order to guide when to stop probing, and to probe each path by starting near its midpoint. Following the SIGMETRICS work, we implemented Doubletree, and deployed it in a real network environment. This paper describes that implementation, as well as preliminary favorable results. [less ▲]

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See detailRapport 2 projet FIRST DEI IMOBIOSE
Goffin, Dorothée ULg

Report (2006)

Le projet FIRST DEI IMOBIOSE est financé par la région wallonne et en partenariat avec la société Meurens Natural. Ce projet a pour but de produire des sirops d’isomaltooligosaccharides prébiotiques à ... [more ▼]

Le projet FIRST DEI IMOBIOSE est financé par la région wallonne et en partenariat avec la société Meurens Natural. Ce projet a pour but de produire des sirops d’isomaltooligosaccharides prébiotiques à partir de sirops de céréales et ce dans le respect du cahier des charges biologique, mais également de les caractériser d’un point de vue de leur composition et de leurs effets sur la santé. [less ▲]

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See detailImpact of 2D and 3D vision on performance of novice subjects using da Vinci robotic system
Blavier, Adelaïde ULg; Gaudissart, Quentin; Cadière, Guy-Bernard et al

in Acta Chirurgica Belgica (2006), 106(6), 662-664

Purpose of the study : The aim of this study was to evaluate the impact of 3D and 2D vision on performance of novice subjects using da Vinci robotic system. Methods : 224 nurses without any surgical ... [more ▼]

Purpose of the study : The aim of this study was to evaluate the impact of 3D and 2D vision on performance of novice subjects using da Vinci robotic system. Methods : 224 nurses without any surgical experience were divided into two groups and executed a motor task with the robotic system in 2D for one group and with the robotic system in 3D for the other group. Time to perform the task was recorded. Results : Our data showed significant better time performance in 3D view (24.67 +/- 11.2) than in 2D view (40.26 +/- 17.49, P < 0.001). Conclusions : Our findings emphasized the advantage of 3D vision over 2D view in performing surgical task, encouraging the development of efficient and less expensive 3D systems in order to improve the accuracy of surgical gesture, the resident training and the operating time. [less ▲]

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See detailAssessment of trophic relationships between symbiotic tropical ophiuroids using C and N stable isotope analysis
Fourgon, Didier; Lepoint, Gilles ULg; Eeckhaut, Igor

in Journal of the Marine Biological Association of the United Kingdom (2006), 86(6), 1443-1447

Analyses of the natural abundance of carbon and nitrogen stable isotopes were performed to investigate the feeding habits of two ophiurolds, Ophiomastix venosa and Ophiocoma scolopendrina, and to assess ... [more ▼]

Analyses of the natural abundance of carbon and nitrogen stable isotopes were performed to investigate the feeding habits of two ophiurolds, Ophiomastix venosa and Ophiocoma scolopendrina, and to assess the potential benefit obtained by the symbiotic Ophiomastix venosa juveniles. A tracer experiment was also carried Out to clarify the contribution of algae to the nitrogen uptake amongst the tested ophiurolds. Our results suggest that Ophiocoma scolopendrina adults occupy a higher position in the food web than Ophiomastix venosa and mainly feed on neuston. In contrast, O. venosa adults feed on the alga Sargassum densifolium, and on organic matter associated with sediment. Free juveniles and symbiotic juveniles of O. venosa have intermediate PC values between both adult species. The high proportion of C-13 in the symbiotic juveniles compared to the one in their conspecific adults indicates that their diet slightly differs from the latter and is closer to that of Ophiocoma scolopendrina. This raises the hypothesis that symbiotic juveniles steal neuston front their associated host, O. scolopendrina. [less ▲]

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