Last 7 days
Bookmark and Share    
Full Text
See detailThe Martian diffuse aurora: Monte Carlo simulations and comparison with IUVS-MAVEN observations
Gérard, Jean-Claude ULg; Soret, Lauriane ULg; Schneider, N. et al

Conference (2016, December)

A new type of Martian aurora, characterized by an extended spatial distribution, an altitude lower than the discrete aurora and electron precipitation up to 200 keV has been observed following solar ... [more ▼]

A new type of Martian aurora, characterized by an extended spatial distribution, an altitude lower than the discrete aurora and electron precipitation up to 200 keV has been observed following solar activity on several occasions with the IUVS on board the MAVEN spacecraft. We describe the results of Monte Carlo simulations of the production of several ultraviolet and visible auroral emissions for initial electron energies from 0.1 to 200 keV. These include the CO2+ ultraviolet doublet (UVD) at 288.3 and 289.6 nm and the Fox–Duffendack–Barker (FDB) bands, CO Cameron and Fourth Positive bands, OI 130.4 and 297.2 nm and CI 156.1 nm and 165.7 nm multiplets. We calculate the nadir and limb intensities of several of these emissions for a unit precipitated energy flux. Our results indicate that electrons in the range 100-200 keV produce maximum CO2+ UVD emission near 75 km. We combine SWEA and SEP electron energy spectra measured during diffuse aurora to calculate the volume emission rates and compare with IUVS observations of the emission limb profiles. The strongest predicted emissions are the CO2+ FDB, UVD and the CO Cameron bands. The metastable a 3Π state which radiates the Cameron bands is deactivated by collisions below ~110 km. As a consequence, we show that the CO2+ UVD to the Cameron bands ratio increases at low altitude in the energetic diffuse aurora. [less ▲]

Detailed reference viewed: 22 (5 ULg)
See detailA Rhynie Chert plant out of the Rhynie Chert
Cascales-Miñana, Borja ULg; Gerrienne, Philippe ULg

Conference (2016, December)

Detailed reference viewed: 8 (1 ULg)
See detailThe "graptolite hypothesis" or how to turn a palaeobotanical evidence into a scientific puzzle
Gerrienne, Philippe ULg; Tinn, Oive; Versteegh, Gerard et al

Conference (2016, December)

Detailed reference viewed: 8 (1 ULg)
Full Text
See detailRelationships between environmental parameters and the microbenthic loop of Posidonia oceanica meadows at small spatial scale
Pete, Dorothée ULg; Alvera Azcarate, Aida ULg; Gobert, Sylvie ULg

in Zoology 2016: 23rd Congress of Zoology (2016, December)

In these times of global change, understanding how carbon flows through ecosystems is of primary importance. In coastal Mediterranean regions, Posidonia oceanica meadows produce and store a lot of carbon ... [more ▼]

In these times of global change, understanding how carbon flows through ecosystems is of primary importance. In coastal Mediterranean regions, Posidonia oceanica meadows produce and store a lot of carbon, but most of it is described as refractory. As a step in the understanding of how organic matter degradation/storage happens in this ecosystem, this study focus on small scale relationships between the microbenthic loop (organic matter, microphytobenthos, bacteria and meiofauna) and environmental parameters (grain size, P. oceanica density, vegetal fibre biomass, pore water nutrient content, sediment total carbon (TC), organic carbon (TOC), nitrogen (TN) and phosphorous (TP) contents, phaeopigments and bacterial production (FDC)). Thus, a 1.25 m x 1.25 m frame was put in a pristine P. oceanica meadow and twelve points were randomly sampled in May 2008 for all the studied parameters. At such a small scale, every component of the microbenthic loop presented a heterogeneity, which was the highest for the microphytobenthos biomass and the lowest for total meiofauna abundance (TMA). No relationship was found between the components of the microbenthic loop but the abundances of Turbellaria and Ciliophora were correlated with total organic matter in the sediment (TOM). None of the environmental parameter was linked with the microphytobenthos biomass, suggesting that the high spatial variability observed did not depend on the measured parameters. Relationships were found between TOM and ammonium, total bacteria abundance and biomass (TBA and TBB) and sediment phaeopigments, TMA and TC, TN and TP. TBB variability was however explained by a combination of FDC and nutrient contents in pore water and sediment. Taking the microbenthic loop as a whole, pore water ammonium and nitrites + nitrates, FDC and phaeopigments were able to explain the observed variability. So, at small scale the variability in the microbenthic loop of a P. oceanica meadow is related with parameters linked with degradation processes and bacteria activities (phaeopigments, FDC, ammonium, nitrites + nitrates), except for meiofauna, which is related with the nutrient content of the sediment, especially TC. Those results underline the importance of the relationship between the microbenthic loop and degradation processes, even at a small scale. [less ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailGC×GC-(HR)TOFMS : Why we Love it !
Focant, Jean-François ULg

Scientific conference (2016, December)

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
See detailWhen obtaining a blood sample from the right arm was not the right thing to do: a case of elevated parathyroid hormone levels 27 years after thyroidectomy.
Wolff, Fleur; Gervy, Christine; Cavalier, Etienne ULg et al

in Clinical Chemistry & Laboratory Medicine (2016)

Detailed reference viewed: 20 (1 ULg)
Full Text
Peer Reviewed
See detailQui a peur du style en sociologie de la littérature ?
Stienon, Valérie ULg; Dessy, Clément; van Nuijs, Laurence

in COnTEXTES : Revue de Sociologie de la Littérature (2016), 18

Une certaine idée romantique du style a contribué, depuis le début du XIXe siècle, à développer une conception singularisante du style, qui associe celui-ci à l'expression d'une originalité de l'individu ... [more ▼]

Une certaine idée romantique du style a contribué, depuis le début du XIXe siècle, à développer une conception singularisante du style, qui associe celui-ci à l'expression d'une originalité de l'individu écrivant. Que faire alors de cette conception de la singularité en sociologie de la littérature, discipline qui privilégie l’explication par le collectif et s’attache à situer chaque pratique dans le tout social ? Comment retrouver les traces de l’individu social dans la matière verbale ou la trace écrite qu’il produit ? L’expression et la saisie d’une subjectivité, censées être le propre du style, sont-elles objectivables ? Dans quelle mesure les styles peuvent-ils rencontrer les dynamiques collectives ? Cet article propose un état de la question et quelques pistes méthodologiques à la lumière des approches sociales du littéraire. [less ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
Peer Reviewed
See detailFirst-principles reinvestigation of bulk WO3
Hamdi, Hanen ULg; Salje, Ekhard K. H.; Ghosez, Philippe ULg et al

in Physical Review B (2016), 94

Using first-principles calculations, we analyze the structural properties of tungsten trioxide WO3. Our calculations rely on density functional theory and the use of the B1-WC hybrid functional, which ... [more ▼]

Using first-principles calculations, we analyze the structural properties of tungsten trioxide WO3. Our calculations rely on density functional theory and the use of the B1-WC hybrid functional, which provides very good agreement with experimental data. We show that the hypothetical high-symmetry cubic reference structure combines several ferroelectric and antiferrodistortive (antipolar cation motions, rotations, and tilts of oxygen octahedra) structural instabilities. Although the ferroelectric instability is the largest, the instability related to antipolar W motions combines with those associated to oxygen rotations and tilts to produce the biggest energy reduction, yielding a P21/c ground state. This nonpolar P21/c phase is only different from the experimentally reported P c ground state by the absence of a very tiny additional ferroelectric distortion. The calculations performed on a stoichiometric compound so suggest that the low-temperature phase of WO3 is not intrinsically ferroelectric and that the experimentally observed ferroelectric character might arise from extrinsic defects such as oxygen vacancies. Independently, we also identify never observed R3m and R3c ferroelectric metastable phases with large polarizations and low energies close to the P 21 /c ground state, which makes WO3 a potential antiferroelectric material. The relative stability of various phases is discussed in terms of the anharmonic couplings between different structural distortions, highlighting a very complex interplay. [less ▲]

Detailed reference viewed: 13 (4 ULg)
Full Text
Peer Reviewed
See detailVoir en art, voir en sciences
Dondero, Maria Giulia ULg

in Nouvelle Revue d'Esthétique (2016), 17(1), 139-159

This article is about visual devices that in history of art and in semiotics are generally called "metavisual" and that are used to study some phenomena of framing in artistic images (see the works of ... [more ▼]

This article is about visual devices that in history of art and in semiotics are generally called "metavisual" and that are used to study some phenomena of framing in artistic images (see the works of Victor Stoichita and of Jean-François Bordron). We are going to explore the possibility to use these devices to analyse contemporary scientific images, trying to identify some common actions that go beyond the differences in terms of objects and economy of values between arts and sciences. [less ▲]

Detailed reference viewed: 48 (14 ULg)
Full Text
Peer Reviewed
See detailApproche du régime alimentaire chez le Silure glane
Libois, Roland ULg; Rosoux, René; Gabris, Bruno

in Recherches Naturalistes en Région Centre (2016), 3 N.S.

The Wels originates from central and East-Europe. It was introduced in Europe as early as the Middle Ages and in France the species has been released many times since the 19th century. It invaded the ... [more ▼]

The Wels originates from central and East-Europe. It was introduced in Europe as early as the Middle Ages and in France the species has been released many times since the 19th century. It invaded the Loire river basin at the end of the last century. It is the largest predatory freshwater fish in Europe. Considering its recent increase in numbers and of range and its feeding behaviour, the Orleans museum coordinated a study of the species in the Loire valley from 2011 to 2014 in order to better know the species ecology and especially its choice of prey and food intake. The stomach contents from a sample of 60 individuals of all sizes, captured using nets, were analysed. It feeds on a wide variety of species, more than 23 were found during this study, mainly fish. Anadromous Fish and Lamprey made up an important part of the food intake (66%). [less ▲]

Detailed reference viewed: 18 (0 ULg)
Peer Reviewed
See detailLe générique de faux documentaire. Un incitant à la lucidité paradoxale du spectateur.
Hamers, Jérémy ULg

in Saint-Amand, Denis; Luneau, Marie-Pier (Eds.) Jeux et enjeux de la préface (2016)

Detailed reference viewed: 62 (13 ULg)
Full Text
Peer Reviewed
See detailLa « littératie en santé », avatar creux ou concept dynamisant ?
Henrard, Gilles ULg; Prévost, Marianne

in Santé Conjuguée (2016), 77

Mise en avant comme déterminant de la santé ou comme stratégie d’éducation du patient, la « littératie en santé » est un concept relativement neuf qui suscite beaucoup d’intérêt et dont le champ s’est ... [more ▼]

Mise en avant comme déterminant de la santé ou comme stratégie d’éducation du patient, la « littératie en santé » est un concept relativement neuf qui suscite beaucoup d’intérêt et dont le champ s’est progressivement élargi. Mais faut-il l’adopter sans examiner son sens et ses enjeux ? [less ▲]

Detailed reference viewed: 22 (4 ULg)
See detailGeneral Practice / Family Medicine Multilingual Terminology - English version
Jamoulle, Marc ULg; Resnick, Melissa

Book published by Care Edition (2016)

This monograph reproduces, under the name of The Q-Codes: General Practice / Family Medicine Multilingual Terminology, the list of Q-Codes and their definitions. The Q-Codes are a classification of non ... [more ▼]

This monograph reproduces, under the name of The Q-Codes: General Practice / Family Medicine Multilingual Terminology, the list of Q-Codes and their definitions. The Q-Codes are a classification of non-clinical items in General Practice / Family Medicine (GP/FM). This list is in an ontology-ready format, and made available at www.hetop.eu/Q by the Laboratory of Bioinformatics, University of Rouen, France. The Q-Codes, whose classification is complementary to ICPC-2, are part of the 3CGP project and are intended to retrieve the main organizational concepts in GP/FM. 3CGP is an acronym for “Core Content Classification in Primary Care.” The 3CGP project joins ICPC-2 and Q-Codes to create a new ontology to improve the indexing of grey literature in GP/FM. This monograph contains an explanation of the process of elaboration of the taxonomy, a tabular list of the Q-Codes, the list of their definitions and an index. [less ▲]

Detailed reference viewed: 50 (5 ULg)
Full Text
Peer Reviewed
See detailEffectiveness of pheromone traps against Tuta absoluta
Ettaib, Refki; Belkadhi Mohamed, Sadok; Ben Belgacem, Ali et al

in Journal of Entomology and Zoology Studies (2016), 4(6)

In the Tunisian south, the heated greenhouses are an important axis of development of agriculture thanks to the big geothermal potential of this zone. Currently, this sector suffers from several ... [more ▼]

In the Tunisian south, the heated greenhouses are an important axis of development of agriculture thanks to the big geothermal potential of this zone. Currently, this sector suffers from several phytosanitary problems. In the last years, a new insect, Tuta absoluta, threaten the cultures of cultivated tomatoes in heated greenhouses. To improve control of T. absoluta, the effectiveness of pheromone traps (associated or not with a source of light) and luminous traps (associated or not with water, with limed buckets for limed covers) were compared. The results show that the traps with pheromones significantly catch more adults of T. absoluta compared to all the other types of traps (average number of trapped adults of T. absoluta = 73.4 (± 142)). The luminous traps associated with water, with limed buckets as with limed covers show, as for them, an intermediate effectiveness. In spite of this slightly less effectiveness, the luminous traps have the advantage of low costs of production as well as the advantage of simultaneously capturing males and females of T. absoluta. [less ▲]

Detailed reference viewed: 17 (2 ULg)
Full Text
Peer Reviewed
See detailExpanding chemistry’s horizon with continuous-flow reactors  
Monbaliu, Jean-Christophe ULg; Emmanuel, Noémie ULg; Gerardy, Romaric ULg

in Chimie Nouvelle (2016), 122

Continuous-flow micro- and mesofluidic reactors come with inherent properties that can be advantageously utilized for expanding the horizon of preparative chemistry. Accurate control over local process ... [more ▼]

Continuous-flow micro- and mesofluidic reactors come with inherent properties that can be advantageously utilized for expanding the horizon of preparative chemistry. Accurate control over local process parameters, even under extreme conditions, inherent safety, production homogeneity and seamless scale-up are amongst the most important assets of continuous-flow chemistry. Besides, flow chemistry enables the design of efficient multistep processes with significantly reduced footprints. In this note, we discuss some of the most fascinating aspects of continuous-flow micro- and mesofluidic reactors in the specific context of preparative organic chemistry. [less ▲]

Detailed reference viewed: 13 (1 ULg)
Full Text
Peer Reviewed
See detailNutritional Composition and Rearing Potential of the Meadow Grasshopper (Chorthippus parallelus Zetterstedt)
Paul, Aman ULg; Frederich, Michel ULg; Uyttenbroeck, Roel ULg et al

in Journal of Asia-Pacific Entomology (2016), 19(4), 1111-1116

Insects, particularly those belonging to the family Acrididae (grasshoppers), are commonly consumed as human food in many parts of the world. Grasshoppers of the species Chorthippus parallelus are ... [more ▼]

Insects, particularly those belonging to the family Acrididae (grasshoppers), are commonly consumed as human food in many parts of the world. Grasshoppers of the species Chorthippus parallelus are abundantly found throughout Europe. However, these insects were not consumed by Europeans till now, but could possibly be used as human food, which is why we investigated their chemical composition. We found that they contain high level of proteins (69%), with an excellent amino acid profile and protein digestibility (97%). Furthermore, specimens of C. parallelus have an interesting fatty acids profile and minerals composition. Preliminary toxicity assessment indicates that these insects do not exhibit toxicity towards neutrophil cells (white blood cells). These data suggest that C. parallelus could be considered for human consumption. Rearing trials done during the study show that commercial rearing could be developed to produce sufficient biomass for sustaining human consumption. [less ▲]

Detailed reference viewed: 65 (35 ULg)
Full Text
Peer Reviewed
See detailIntracanalar lumbar neurinoma
Manto, Florence; HOUET, Elise ULg; LACREMANS, Pierre ULg et al

in Abstract Book of Annual Congress of Physical & Rehabilitation Medicine 2016 (2016, December)

Neurinoma are slow growing encapsulated tumors, coming from Schwann cells. They are a rare cause of low back pain, possibly with a radiating pain in the inferior limb. This case report describes the ... [more ▼]

Neurinoma are slow growing encapsulated tumors, coming from Schwann cells. They are a rare cause of low back pain, possibly with a radiating pain in the inferior limb. This case report describes the managing of a patient with right cruralgia without strength lost. The CT- scan had failed to highlight a lesion corresponding to the symptoms of the patient. A MRI was therefore realized, and was able to show a lumbar intradural tumor. The MRI signal of neurinoma is usually typical. However, in this case, the histo-pathological analysis has been necessary to confirm the diagnosis. The patient underwent laminectomy and tumor resection with nearly complete resolution of symptoms, excepting a right perineal hemihypoesthesia, probably corresponding to the location of the concerned nervous root. The MRI is the best method to explore cruralgia or a sciatica not responding to treatment, and without precipitating factor such as disc herniation explaining the symptoms. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Full Text
See detailWorkshop: Comparative methods in evolutionary biology
Frederich, Bruno ULg; Santini, Francesco

Conference (2016, December)

Detailed reference viewed: 14 (0 ULg)
See detailLa spasticité: physiopathologie, évaluation et prise en charge
Martens, Géraldine ULg

Conference (2016, December)

Detailed reference viewed: 9 (2 ULg)