Last 7 days
Bookmark and Share    
Full Text
Peer Reviewed
See detailGlucose production: influence of the datasets and of the long term emissions on LCA results
Gerbinet, Saïcha ULg; Belboom, Sandra ULg; Léonard, Angélique ULg

Poster (2017, May 08)

The aim of this study is to have a good understanding of the environmental impact of glucose production. Glucose is generally produced from corn or wheat. Since agricultural processes are known to be ... [more ▼]

The aim of this study is to have a good understanding of the environmental impact of glucose production. Glucose is generally produced from corn or wheat. Since agricultural processes are known to be difficult to evaluate by LCA, the results obtained with two different LCA databases, Gabi and EcoInvent, are compared in this work. The production of glucose from raw materials can be divided in two steps: the agricultural step allowing the cereal production, and the conversion step including the extraction of the starch from the plant and its hydrolysis into glucose. Preliminary results underline the high impact of the agricultural step, so a special attention has been paid to these data. Specific Belgian data collected by the Walloon Agricultural Research Centre (CRA-W) (2014) [1] have been used as primary data (yield, amount of fertilizers, etc.), either using EcoInvent or Gabi datasets background data to model fertilizers, diesel consumption, etc. A third model was built using only data available in Ecoinvent for corn and wheat cultures. For the conversion steps, literature data have been used along with some industrial data. Based on these multiple sources, it is possible to compare the LCA results for the production of 1 kg of glucose for three different cases. The results underlined that the differences between the two databases are smaller than the differences between specific data (Belgium data) or non-specific data (Ecoinvent) for the agricultural steps. Nevertheless, in some impact categories, the differences between the two databases remain high. The presentation will underline where these differences are coming from. This leads to also analyze the differences between background data such as energy generation or fertilizer production. Moreover, special attention has been put on the influence of long-term emissions, in the Ecoinvent database. As these emissions have a large influence in some impact categories, we have to clarify if we should include them or not in view of comparison with GaBi database. Moreover, the Ecoinvent model and the GaBi models have been realized in two different software (Simapro and GaBi, respectively), therefore, some checks have been performed to see if some differences can be induced by the software. In conclusion, this presentation will underline which is the sensibility of the results to parameters not controlled by the LCA practitioner, such as the datasets hypotheses, the software differences, etc. 1. Walloon Agricultural Research Centre (CRA-W), ALT4CER project. 2014. [less ▲]

Detailed reference viewed: 18 (0 ULg)
See detailCardinal Lorenzo Pucci and the Reform
Trizzullo, Eva ULg

Scientific conference (2017, May 08)

Born in Florence in 1458, Lorenzo Pucci comes from a family who had always been closely linked to the Medici. Present in Rome from 1484 onwards, Pucci soon becomes one of the most influent prelates in the ... [more ▼]

Born in Florence in 1458, Lorenzo Pucci comes from a family who had always been closely linked to the Medici. Present in Rome from 1484 onwards, Pucci soon becomes one of the most influent prelates in the immediate environment of Jules II, and is made cardinal right after Leo X’s election in 1513. In 1520, Pucci, who had been praised by Erasmus for his efforts to “restore the Christian religion”, is appointed penitenziere maggiore. As such, he could grant indulgences and was therefore at the heart of the practices strongly condemned by Luther. By using contemporary testimonies, this presentation aims to dwell on the role endorsed by Pucci as penitenziere and to examine the conditions that led him to that powerful position. I should also give some clues about his profile as a patron of arts. [less ▲]

Detailed reference viewed: 26 (5 ULg)
Full Text
See detailSpray Drying-­Assisted Synthesis of Na2FePO4F/CB and Na2FePO4F/CNT Composite Cathodes for Lithium Ion Battery
Mahmoud, Abdelfattah ULg; Brisbois; Caes, sebastien et al

Conference (2017, May 08)

Fluorophosphates are considered among the most interesting series of cathode materials for Li/Na-ion batteries. Na2FePO4F, with layered structure and two-dimensional pathways for facile Na+/Li+ transport ... [more ▼]

Fluorophosphates are considered among the most interesting series of cathode materials for Li/Na-ion batteries. Na2FePO4F, with layered structure and two-dimensional pathways for facile Na+/Li+ transport [1], exhibits minimal structural changes (3.7%) upon reduction/oxidation. The average working voltage is 3.3 V versus Li+/Li. However, one of the key drawbacks of Na2FePO4F electrodes is their low intrinsic electronic conductivity. In this work, we report on the synthesis of Na2FePO4F by spray-drying, a technique which is easily scaled-up from the lab- to the industrial-scale and ensures a good homogeneity of all precursors. We are investigating the replacement of the grinding step by the addition of conductive carbon (carbon black and carbon nanotubes) to the solution containing the inorganic precursors of the Na2FePO4F phase in order to prepare Na2FePO4F/CB and Na2FePO4F/CNT with different ratios of CB and CNT (10 and 20%) and enhanced conductivity. The electrochemical performance shows that the addition of CNT improves remarkably the capacity of the NFPF electrode material thanks to better CNT dispersion inside and at the surface of the NFPF particles which enhances the electronic conductivity. Acknowledgements: The authors thank the Walloon Region for support under the “PE Plan Marshall 2.vert” program (BATWAL -1318146). A. Mahmoud is grateful to the Walloon region for a Beware Fellowship Academia 2015-1, RESIBAT n° 1510399. References [1] M. Brisbois, S. Caes, M-T. Sougrati, B. Vertruyen, A. Schrijnemakers, R. Cloots, N. Eshraghi, R-P. Hermann, A. Mahmoud, F. Boschini, Solar Energy Materials & Solar Cells 148 (2015) 11-19. [less ▲]

Detailed reference viewed: 59 (8 ULg)
Peer Reviewed
See detailDerjaguin-Broekhoff-de Boer analysis of adsorption in very disordered mesopores using probabilistic models
Gommes, Cédric ULg

Conference (2017, May 08)

Our current ability to produce mesoporous materials with ordered morphology has raised fascinating questions about the impact of geometrical disorder on adsorption and desorption states [1]. Many recent ... [more ▼]

Our current ability to produce mesoporous materials with ordered morphology has raised fascinating questions about the impact of geometrical disorder on adsorption and desorption states [1]. Many recent works have investigated the role of mild elements of disorder, such as local constriction or corrugation superimposed to otherwise geometrically ideal cylindrical pores [2,3]. These works have notably shown that elements of disorder may act as nucleation sites and destabilize vapor-like metastable states. The relevance of these perturbation-like results to fundamentally disordered materials, such as gels, is unclear. In particular, do vapor-like metastable states exist at all in this type of very disordered material? In the present communication, we address this question using probabilistic models to investigate the role of disorder. We generalize the classical Gaussian field models of porous materials [4] and use them to analyze adsorption and desorption in the Derjaguin-Broekhof-de Boer approximation. Our approach differs from earlier contributions in that both the adsorbent and the adsorbate are described in terms of probabilities [5]. This enables us to analyze the adsorbate configuration in very disordered solids using a low-dimensional yet realistic configuration space. We notably show that vapor-like metastable states are unlikely in gel-like disordered materials. [less ▲]

Detailed reference viewed: 7 (0 ULg)
See detailExophtalmie dysthyroïdienne : intérêt de l'abord coronal
XHAUFLAIRE, Gaël ULg

Conference (2017, May 08)

Bien qu’aucun consensus strict ne soit défini, la tendance actuelle en chirurgie de l'exophtalmie dysthyroidienne, comme dans toute chirurgie, est à la petite incision. Il est toutefois utile de rappeler ... [more ▼]

Bien qu’aucun consensus strict ne soit défini, la tendance actuelle en chirurgie de l'exophtalmie dysthyroidienne, comme dans toute chirurgie, est à la petite incision. Il est toutefois utile de rappeler l’intérêt de l’abord coronal dans le traitement périorbitaire global de l’orbitopathie dysthyroïdienne. L'abord coronal permet un effondrement complet et efficace de 3 à 4 parois bilatérales. Il peut être associé à une lipectomie, à des greffes osseuses, voire à une reconstruction crânio-faciale plus complète, en un seul temps opératoire. L'effondrement de la paroi externe de l'orbite peut être réalisée sans pression sur le globe, et donc à moindre risque pour un oeil fragilisé par une myopie forte ou des chirurgies antérieures. La chirurgie ethmoïdale centrifuge expose à moins de risques de grasping musculaire qu'une chirurgie endonasale. La chirurgie s'effectuant du haut vers le bas expose à moins de risques de pénétration méningée et de fuite de LCR. La décompression "balancée", avec conservation du plancher médian et du ROOT expose à moins de risque de diplopie incoercible et à un moindre risque d'anesthésie trigéminée définitive. En présence d'une exophtalmie forte et d'un orbite congestif, fibreux, cicatriciel, d'un globe fragile, voire d'une sinusopathie, l'abord coronal sera parfois le seul possible. [less ▲]

Detailed reference viewed: 13 (1 ULg)
Full Text
See detailFirst retrievals of methane isotopologues from FTIR ground-based observations in the High Arctic
Bader, Whitney ULg; Strong, Kimberley; Walker, Kaley et al

Conference (2017, May 08)

Atmospheric methane concentrations have reached a new high at 1845 ± 2 ppb, accounting for an increase of 256 % since pre-industrial times (WMO, 2016). In the last ten years, methane has been on the rise ... [more ▼]

Atmospheric methane concentrations have reached a new high at 1845 ± 2 ppb, accounting for an increase of 256 % since pre-industrial times (WMO, 2016). In the last ten years, methane has been on the rise again at rates of ~0.3%/year (e.g., Bader et al., 2016), after a period of stabilization of about 5 years. This recent increase is not fully understood due to remaining uncertainties in the methane budget, influenced by numerous anthropogenic and natural emission sources. In order to examine the cause(s) of this increase, we focus on the two main methane isotopologues, i.e. CH3D and 13CH4. Both isotopologues are emitted in the atmosphere with a different ratio depending on the emission processes involved. As heavier isotopologues will react more slowly than 12CH4, each isotopologue will be depleted from the atmosphere at a specific rate depending on the removal process. Methane isotopologues are therefore good tracers of the methane budget. In this contribution, the first development and optimization of the retrieval strategy of CH3D as well as the preliminary tests for 13CH4 will be presented and discussed, using FTIR (Fourier Transform infrared) solar spectra collected at the Polar Environment Atmospheric Research Laboratory, located at Eureka, Nunavut (80.05 °N, -86.42 °E, 610 m a.s.l.). Mixing ratio vertical profiles from a Whole Atmosphere Community Climate Model (WACCM v.4, Marsh et al., 2013) simulation developed by Buzan et al. (2016) are used as a priori inputs. The uncertainties affecting the retrieved columns, as well as an evaluation of the information content, will be discussed in order to assess the best strategy to be employed based on the altitude sensitivity range and complete error budget. [less ▲]

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
See detailStudy of Meta-analysis strategies for network inference using information-theoretic approaches
Pham, Cam Ngoc ULg; Haibe-Kains; Bellot, Pau et al

in BioData Mining (2017)

Detailed reference viewed: 21 (3 ULg)
See detailObjets directs en kirundi
Tuyubahe, Pascal ULg

Conference (2017, May 05)

Detailed reference viewed: 14 (4 ULg)
See detailStaaten mit ausgeprägter Regionalautonomie - Fallstudie : Belgien
Behrendt, Christian ULg

Conference (2017, May 05)

Exposé donné à l'invitation du Congrès des pouvoirs locaux et régionaux du Conseil de l'Europe, dans le cadre de la conférence "Pour une réforme territoriale réussie : Causes et méthodes de réformes infra ... [more ▼]

Exposé donné à l'invitation du Congrès des pouvoirs locaux et régionaux du Conseil de l'Europe, dans le cadre de la conférence "Pour une réforme territoriale réussie : Causes et méthodes de réformes infra-nationales dans les pays membres du Conseil de l'Europe", Eupen, Belgique, 5 mai 2017. [less ▲]

Detailed reference viewed: 13 (1 ULg)
See detailHow microbes network (and are networked) in geological disposal research: a sociological perspective
Van Oudheusden, Michiel ULg; Schröder, Jantine; Turcanu, Catrinel

Conference (2017, May 05)

In MIND subtask 3.2, we ascertain whether and how microbes, microbiologists, and microbiology are enrolled into research on the geological disposal of radioactive waste. We adopt a social studies of ... [more ▼]

In MIND subtask 3.2, we ascertain whether and how microbes, microbiologists, and microbiology are enrolled into research on the geological disposal of radioactive waste. We adopt a social studies of science (actor-network theory) perspective that observes how actors within MIND (e.g. MIND researchers, members of the MIND Implementer Review Board) and outside the project (e.g. geologists, waste management regulators, policy makers) process data and generate insights on the role of microbes in waste disposal, and how these processes elicit challenges and opportunities for enrolment. Examples of the latter include mixed appreciations of the impact of microbial activity on artificial barriers (e.g. negligible vs. substantial), the scope for, and appeal of, institutional uptake of microbiology research (e.g. through the coupling of microbiology research to “the safety case”), and the (re)drawing of disciplinary boundaries (e.g. between microbiology and geology). Drawing on these and related examples, we explore how through projects like MIND, microbes network, and are networked, differently for the joint purpose of radioactive waste disposal. [less ▲]

Detailed reference viewed: 19 (1 ULg)
Full Text
See detailManaging donor-related variability in cell production by means of data-based modelling
Mehrian, Mohammad ULg

Scientific conference (2017, May 05)

Detailed reference viewed: 10 (3 ULg)
Full Text
See detailLes Hormones Glycoprotéiques: de la Clinique à la Recherche.
VALDES SOCIN, Hernan Gonzalo ULg

Doctoral thesis (2017)

Detailed reference viewed: 40 (10 ULg)
See detailLe volontariat : un levier vers l'emploi ?
Orianne, Jean-François ULg

Conference given outside the academic context (2017)

Detailed reference viewed: 17 (0 ULg)
Full Text
Peer Reviewed
See detailActivational and organizational disruption of folliculogenesis and estrous cycle caused by exposure to Bisphenol A (BPA) during early postnatal or adult life
Lopez Rodriguez, David ULg; Franssen, Delphine ULg; GERARD, Arlette ULg et al

Conference (2017, May 05)

Our previous studies have shown that an early postnatal exposure to a very low dose of bisphenol A (BPA) disrupts sexual maturation and pubertal timing. However, the long-term effects of such low dose ... [more ▼]

Our previous studies have shown that an early postnatal exposure to a very low dose of bisphenol A (BPA) disrupts sexual maturation and pubertal timing. However, the long-term effects of such low dose exposure as well as the effects of adult exposure have not been studied. One day-old and 90 day-old female rats received daily subcutaneous injections of corn oil (vehicle) or BPA (25ng/kg/d or 5mg/kg/d) for 15 days. The early postnatal exposure to both BPA doses significantly decreased the percentage of females with a regular cycle (BPA-25ng: 51±15%; BPA-5mg: 7±7%; OIL: 86±2%). The estrus cycle alterations were characterized by a decrease in time spent in proestrus (BPA-25ng: 13±3%; BPA-5mg: 12±3%; OIL: 18±3%). During adult exposure, both doses caused a disruption of the estrous cycle characterized by a significant decrease in the average time spent in proestrus (BPA-25ng: 19±2%; BPA-5mg: 17±1%; OIL: 23±1%). This effect was transient as the exposed females showed a regular cycle one month after the last dose of BPA. After adult exposure, we also observed a disruption of folliculogenesis characterized by a significant decrease of antral follicles (BPA-25ng: 21±2%; BPA-5mg: 21±2%; OIL: 36±2%) and increase of atretic follicles (BPA-25ng: 24±4%; BPA-5mg: 26±6%; OIL: 15±1%). GnRH secretion measured ex vivo 24h after adult exposure was moderately affected by BPA. Indeed, GnRH interpulse interval was significantly different when comparing animals exposed to the high or low dose of BPA but not when comparingexposed animals to the control group (BPA-25ng: 42.6±0.5; BPA-5mg: 40.2±0.6%; OIL: 41.1±0,2minutes±SEM). In conclusion, while exposure to BPA produces persistent alterations of the estrous cycle after early postnatal exposure, exposure during adulthood appears to cause activational non-persistent alternations of both the estrous cycle and folliculogenesis. [less ▲]

Detailed reference viewed: 57 (4 ULg)
Full Text
Peer Reviewed
See detailAdipsic diabetes insipidus revealing a bifocal intracranial germinoma
KREUTZ, Julie ULg; Potorac, Iulia ULg; LUTTERI, Laurence ULg et al

in Annales d'Endocrinologie (2017)

Abstract Adipsic diabetes insipidus is a rare complication of intracranial tumors in which impaired antidiuretic hormone secretion is associated with the loss of thirst sensation. Here, we present the ... [more ▼]

Abstract Adipsic diabetes insipidus is a rare complication of intracranial tumors in which impaired antidiuretic hormone secretion is associated with the loss of thirst sensation. Here, we present the case of a patient with bifocal intracranial germinoma, diagnosed due to symptoms mainly caused by adipsic diabetes insipidus. This is, to our knowledge, the first case of adipsic diabetes insipidus revealing an intracranial germinoma reported in the literature. We describe the diagnostic procedures and the three-year follow-up of this patient. Management of intracranial germ-cell tumors is made complex by the wide range of histological features. Although germinomas have a generally better prognosis than most nongerminomatous tumors, they can have severe or even life-threatening presentations. Adipsic diabetes insipidus is one such severe presentation and its rarity can make it difficult to recognize and manage. Awareness of this potential entity is therefore important for clinical practice. Le diabète insipide adipsique est une des rares complications des tumeurs intracrâniennes. Il associe une baisse de la sécrétion d’hormone antidiurétique à une perte de la sensation de soif et ilsignale souvent la présence d’une lésion qui atteint ou envahit l’hypothalamus. Nous présentons le cas d’une patiente avec un germinome intracrânien bifocal diagnostiqué devant un tableau de diabète insipide adipsique. À notre connaissance, il s’agit du premier cas de la littérature d’un diabète insipide révélant un germinome intracrânien. La prise en charge des tumeurs germinales intracrâniennes est complexe du fait des phénotypes histologiques divers. Bien que les germinomes ont généralement un meilleur pronostic que les tumeurs non-germinomateuses, ils peuvent avoir des présentations sévères. Le diabète insipide adipsique est une de ces présentations sévères et sa rareté peut rendre son diagnostic et sa prise en charge difficiles. La reconnaissance de cette entité potentielle est, dès lors, importante pour la pratique clinique [less ▲]

Detailed reference viewed: 40 (6 ULg)
Full Text
Peer Reviewed
See detailAIP mutations and gigantism
Rostomyan, Liliya ULg; Potorac, Iulia ULg; BECKERS, Pablo ULg et al

in Annales d'Endocrinologie (2017)

AIP mutations are rare in sporadic acromegaly but they are seen at a higher frequency among certain specific populations of pituitary adenoma patients (pituitary gigantism cases, familial isolated ... [more ▼]

AIP mutations are rare in sporadic acromegaly but they are seen at a higher frequency among certain specific populations of pituitary adenoma patients (pituitary gigantism cases, familial isolated pituitary adenoma (FIPA) kindreds, and patients with macroadenomas who are diagnosed ≤ 30 years). AIP mutations are most prevalent in patients with pituitary gigantism (29% of this group were found to have mutations in AIP gene). These data support targeted genetic screening for AIP mutations/deletions in these groups of pituitary adenoma patients. Earlier diagnosis of AIP-related acromegaly-gigantism cases enables timely clinical evaluation and treatment, thereby improving outcomes in terms of excessive linear growth and acromegaly comorbidities. Bien que les mutations du gène AIP soient rares dans les cas d’acromégalie sporadique, l’importance de ces mutations est établie dans des populations spécifiques de patients telles que les patients qui souffrent de familial isolated pituitary adenomas (FIPA), de gigantisme ou qui présentent un macroadénome hypophysaire avant l’âge de 30 ans. C’est dans le gigantisme qu’elles sont le plus fréquemment retrouvées (29 % des géants présentent une mutation de ce gène). Dans ces populations, nos données suggèrent qu’il est utile de réaliser un screening ciblé pour les mutations ou délétions du gène AIP. La reconnaissance précoce des cas d’acromégalie et de gigantisme permet une évaluation clinique et un traitement appropriés de ces patients. Elle contribue à améliorer les résultats des traitements tant en terme de croissance excessive qu’en ce qui concerne les comorbidités liées à l’acromégalie. [less ▲]

Detailed reference viewed: 42 (20 ULg)
Full Text
Peer Reviewed
See detailCow milk coagulation: process description, variation factors and evaluation methodologies. A review.
Troch, Thibault; Lefebure, Emilie ULg; Baeten, Vincent et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment (2017), 21

Introduction. For dairy producers who want to transform their milk, the ability of milk to coagulate is an important parameter. It makes it possible to transform milk into cheese. Therefore, it is ... [more ▼]

Introduction. For dairy producers who want to transform their milk, the ability of milk to coagulate is an important parameter. It makes it possible to transform milk into cheese. Therefore, it is necessary to understand the coagulation process and the techniques to measure it in order to achieve the best transformation performance. The objective of this review is to describe the milk coagulation process, the factors influencing it and the methods for measuring the coagulation of milk at lab level. Literature. The processing of milk into cheese involves three steps: coagulation, dewatering and refining. Coagulation is a key step which involves the use of rennet and depends on several parameters (pH, calcium content, temperature, etc.). Some milks never coagulate. To measure the coagulation ability of milk and identify different parameters in milk coagulation properties, the Formagraph, the computerized renneting meter and the Optigraph have been developed (reference methods). Equations have been developed using infrared spectrometry to predict the parameters obtained by the reference methods. Conclusions. The milk coagulation mechanism is known. However, the issue of non-coagulating milk persists and represents a real challenge in terms of yield. The use of infrared is a faster alternative to reference methods that measure the coagulation properties of milk, but still requires an improvement in prediction equations. [less ▲]

Detailed reference viewed: 36 (2 ULg)