Last 7 days
Bookmark and Share    
Full Text
See detailA panmictic Amazonian world? : Bryophytes testify
Ledent, Alice ULiege

Poster (2017, July 25)

Understanding connectivity over different spatial and temporal scales is fundamental for biodiversity conservation and management. The Amazonian rainforest, one of the most diverse biodiversity hotspots ... [more ▼]

Understanding connectivity over different spatial and temporal scales is fundamental for biodiversity conservation and management. The Amazonian rainforest, one of the most diverse biodiversity hotspots, has experienced dramatic range contractions and expansions due to Pleistocene climate oscillations, and its human-induced fragmentation has accelerated at an unparalleled pace in the course of the Anthropocene. In this context, epiphytes, with their relatively short life-cycles, offer an ideal model to investigate the impact of past and present fragmentation on patterns of genetic structure and diversity. Due to the necessity to switch from one host tree to another, or from one leaf to another, epiphytic bryophytes typically exhibit high dispersal syndromes. In line with such high dispersal capacities, recent metacommunity analyses have arisen the intriguing question that Amazonian epiphytic bryophyte communities are homogeneous across very large spatial scales, ultimately raising the notion that they might behave as a basin-wide panmictic population. Here, we implement fine-scale population genetic analyses to address the following questions:(i) Do Amazonian epiphytes exhibit population structure at regional (< 500 km) scale; (ii) If the hypothesis of a panmictic population is rejected, (iia) at which spatial scale does genetic structuring occur, and (iib) do neutral (isolation-by-distance) or ecological (isolation-by-ecology) processes shape patterns of genetic variation? We sampled exemplars of 15 epiphytic bryophyte species from two ecologically contrasted forest types (lowland rainforest and white-sand forest) in a 50,000 km2 area in the middle Rio Negro. Genome-wide genetic data were produced using Genotyping By Sequencing. To circumvent severe taxonomic issues in challenging groups, which, like the Calymperaceae, are dominant in the epiphytic flora, we first implemented species delimitation analyses to sort-out specimens taxonomically. We then described the fine-scale genetic structure of each species and performed isolation-by-distance analyses to detect significant spatial genetic structuring. We finally determined whether isolation-by-distance or ecological filtering contribute to the observed patterns of genetic variation. The study will provide key information on the populations dynamics of highly mobile species integral to the iconic Amazonian forest, which may further be employed to refine future conservation policies in the face of accelerating climate change and anthropogenic-mediated deforestation. [less ▲]

Detailed reference viewed: 23 (4 ULiège)
Peer Reviewed
See detailComprehensive Ion Mobility Calibration Strategies based on Synthetic Polymers
Haler, Jean ULiege; Kune, Christopher ULiege; Chirot, Fabien et al

Conference (2017, July 24)

Detailed reference viewed: 40 (5 ULiège)
Full Text
Peer Reviewed
See detailSelf-assembly processes of superparamagnetic colloids in a quasi-two-dimensional system
Rojas, Nicolas; Darras, Alexis ULiege; Lumay, Geoffroy ULiege

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2017), 96(1), 012608

Superparamagnetic colloids gather depending on the magnitude of the magnetic field applied, forming chains and ribbons in a quasi-two-dimensional chamber. The results presented in this work are in good ... [more ▼]

Superparamagnetic colloids gather depending on the magnitude of the magnetic field applied, forming chains and ribbons in a quasi-two-dimensional chamber. The results presented in this work are in good agreement with recent experimental multistable data for the mean length of the aggregates in thermodynamic equilibrium. [less ▲]

Detailed reference viewed: 37 (2 ULiège)
See detailDual-specificity-phosphatase 3 (DUSP3) deletion promotes liver inflammation and high fat diet-induced hepatocellular carcinoma
Jacques, Sophie ULiege; Arjomand, Arash ULiege; Vandereyken, Maud ULiege et al

Poster (2017, July 24)

Overweight and obesity are considered as risk factors for hepatocellular carcinoma (HCC) development. The mechanisms by which obesity promotes liver inflammation are however poorly understood. We recently ... [more ▼]

Overweight and obesity are considered as risk factors for hepatocellular carcinoma (HCC) development. The mechanisms by which obesity promotes liver inflammation are however poorly understood. We recently generated a full DUSP3 knockout (KO) mouse. The obtained mice were born normal with no spontaneous phenotype. However, while aging, DUSP3-KO mice became obese and developed hepatosteatosis. The phenotype was exacerbated under high fat diet (HFD). Furthermore, when treated with diethylnitrosamine (DEN) procarcinogen, DUSP3-KO mice developed HCC faster than WT littermates. The combination of DEN with HFD accelerated the onset of HCC development in these mice compared to WT mice. This was associated with increased systemic levels of several metabolites and with hyperphosphorylation of the insulin-like growth factor receptor I. [less ▲]

Detailed reference viewed: 23 (4 ULiège)
See detailFunctional and structural characterisation of the Arabidopsis thaliana HMA4 protein
Lekeux, Gilles ULiege; Laurent, Clémentine; Xiao, Zhiguang et al

Poster (2017, July 24)

Detailed reference viewed: 27 (5 ULiège)
Full Text
Peer Reviewed
See detailHARMONIC BALANCE COMPUTATION OF THE NONLINEAR FREQUENCY RESPONSE OF A THIN PLATE
Lee, Jongsuh ULiege; Kerschen, Gaëtan ULiege; Detroux, Thibaut ULiege

Conference (2017, July 24)

The harmonic balance method (HBM) is used to investigate the dynamical behavior of the geometrical nonlinear plate. The middle plane displacements are included in the plate in which the equations of ... [more ▼]

The harmonic balance method (HBM) is used to investigate the dynamical behavior of the geometrical nonlinear plate. The middle plane displacements are included in the plate in which the equations of motion are developed by the principle virtual work. Moreover, the nonlinear frequency response curves, or NFRCs, are obtained by a continuation method. [less ▲]

Detailed reference viewed: 41 (4 ULiège)
Full Text
See detailReproductivity and egg quality of H’Mong chicken
Nguyen Van Duy, ULiege; Nguyen Thi Phuong; Vu Dinh Ton et al

Scientific conference (2017, July 21)

This study was carried out at the experimental farm of Vienam National University of Agriculture (VNUA) during six months from August, 2016 to February, 2017. H'mong chickens were raised in three plots in ... [more ▼]

This study was carried out at the experimental farm of Vienam National University of Agriculture (VNUA) during six months from August, 2016 to February, 2017. H'mong chickens were raised in three plots in order to observe reproductive performane and egg quality. The results showed that productive performance of H'mong chickens was low in comparison with other local breeds. On average, the first egg laying age was 151.67 days when their body weight was 1323.8 grams. Twenty two to forty two week-old hens resulted in the average reproductive performane as 24,12 eggs/hen, laying rate as 17.23 percents, and FCR as 6.58 kg/10 eggs. Egg quality of H'mong chickens conformed to all standards of high-quality local eggs. [less ▲]

Detailed reference viewed: 22 (5 ULiège)
Full Text
Peer Reviewed
See detailTypical versus delayed speech onset influences verbal reporting of autistic interests
Chiodo, Liliane ULiege; Majerus, Steve ULiege; Mottron, Laurent

in Molecular Autism (2017)

The distinction between autism and Asperger syndrome has been abandoned in the DSM-5. However, this clinical categorization largely overlaps with the presence or absence of a speech onset delay which is ... [more ▼]

The distinction between autism and Asperger syndrome has been abandoned in the DSM-5. However, this clinical categorization largely overlaps with the presence or absence of a speech onset delay which is associated with clinical, cognitive, and neural differences. It is unknown whether these different speech development pathways and associated cognitive differences are involved in the heterogeneity of the restricted interests that characterize autistic adults. [less ▲]

Detailed reference viewed: 43 (1 ULiège)
Full Text
Peer Reviewed
See detailAcromegaly at diagnosis in 3173 patients from the Liege Acromegaly Survey (LAS) database.
PETROSSIANS, Patrick ULiege; Daly, Adrian ULiege; Natchev, Emil et al

in Endocrine-Related Cancer (2017)

Acromegaly is a rare disorder caused by chronic growth hormone (GH) hypersecretion. While diagnostic and therapeutic methods have advanced, little information exists on trends in acromegaly ... [more ▼]

Acromegaly is a rare disorder caused by chronic growth hormone (GH) hypersecretion. While diagnostic and therapeutic methods have advanced, little information exists on trends in acromegaly characteristics over time. The Liege Acromegaly Survey (LAS) database, a relational database, is designed to assess the profile of acromegaly patients at diagnosis and during long-term follow-up at multiple treatment centers. The study population consisted of 3173 acromegaly patients from ten countries; 54.5% were female. Males were significantly younger at diagnosis than females (43.5 vs. 46.4 years; p<0.001). The median delay from first symptoms to diagnosis was two years longer in females (p=0.015). Ages at diagnosis and first symptoms increased significantly over time (p<0.001). Tumors were larger in males than females (p<0.001); tumor size and invasion were inversely related to patient age (p<0.001). Random GH at diagnosis correlated with nadir GH levels during OGTT (p<0.001). GH was inversely related to age in both sexes (p<0.001). Diabetes mellitus was present in 27.5%, hypertension in 28.8%, sleep apnea syndrome in 25.5% and cardiac hypertrophy in 15.5%. Serious cardiovascular outcomes like stroke, heart failure and myocardial infarction were present in <5% at diagnosis. Erythrocyte levels were increased and correlated with IGF-1 values. Thyroid nodules were frequent (34.0%); 820 patients had colonoscopy at diagnosis and 13% had polyps. Osteoporosis was present at diagnosis in 12.3% and 0.6-4.4% had experienced a fracture. This study of >3100 patients is the largest international acromegaly database and shows clinically relevant trends in the characteristics of acromegaly at diagnosis. [less ▲]

Detailed reference viewed: 45 (3 ULiège)
Full Text
Peer Reviewed
See detailNatural patches in Posidonia oceanica meadows: the seasonal biogeochemical pore water characteristics of two edge types
Abadie, A; Borges, Alberto ULiege; Champenois, Willy ULiege et al

in Marine Biology (2017), 164:166

Seagrass meadows can be assimilated to seascape matrixes encompassing a mosaic of natural and anthropogenic patches. Natural patches within the Mediterranean Posidonia oceanica meadows show a structural ... [more ▼]

Seagrass meadows can be assimilated to seascape matrixes encompassing a mosaic of natural and anthropogenic patches. Natural patches within the Mediterranean Posidonia oceanica meadows show a structural particularity which consist in a duality of their edge types. One edge is eroded by bottom currents, while the adjacent meadow colonizes the bare sediments. This study aims to study the dynamics of these two edges through the investigation of the biogeochemistry (pH, total alkalinity, dissolved inorganic carbon, CO2, CH4, N2O, H2S, dissolved inorganic nitrogen, PO4 3−) within vegetated and unvegetated sediments. These observations are compared with the adjacent meadow to have a better understanding of the colonization processes. Our results reveal that the P. oceanica matrix shows differences from the vegetated edges of sand patches, especially with regard to nutrient availability, which is generally more important at the colonized edge (dissolved inorganic nitrogen up to 65.39 μM in June). A clear disparity also occurs between the eroded and colonized edge with both a seasonal and bathymetrical variation of leaf biomass with higher disparities at 10 m in June (colonized edge 1415 gDW m−2; eroded edge 1133 gDW m−2). Themost important contrasts during this study were assessed in June, suggesting that the warm period of the year is more suitable for sampling to highlight disparate characteristics in temperate seagrass meadows. These findings put into light the potential importance of biogeochemical processes in the dynamics of natural patch edges. We hypothesize that they may influence the structural dynamics of P. oceanica seascapes. [less ▲]

Detailed reference viewed: 26 (4 ULiège)
Full Text
Peer Reviewed
See detailEffects of User IT Capabilities and Organized Big Data Analytics on Competitive Advantage
Kamioka, Taro; Hosoya, Ryuichi; Tapanainen, Tommi ULiege

in Proceedings of the Pacific-Asian Conference on Information Systems (PACIS) (2017, July 20)

In the age of big data, it becomes important to develop capabilities for utilizing information technology (IT) in order to take advantage of the potential of data for business objectives. While users have ... [more ▼]

In the age of big data, it becomes important to develop capabilities for utilizing information technology (IT) in order to take advantage of the potential of data for business objectives. While users have received attention in many ways, we note that the capability literature has focused more on the IT supply side. We argue that user capabilities have moved to an integral position in firm competitive advantage, and call them “User IT Capabilities” (UIC). A survey was conducted to collect data from Japanese organizations, and a total valid sample of 1,170 respondents involved in big data use was extracted. The findings show the effect of UIC on the performance of big data analytics and firm competitiveness, mediated by the variable of organized big data analytics (OBDA). The direct effects are shown to be valid irrespective of company size, although the levels of UIC and OBDA are higher in larger firms. [less ▲]

Detailed reference viewed: 52 (4 ULiège)
Full Text
See detailQuality evaluation of peach chips and anticancer activity of pectin extracted from chips dehydrated by explosion puffing drying
Lyu, Jian ULiege

Doctoral thesis (2017)

The objectives of this research are to discriminate the overall quality level of peach and nectarine chips prepared by explosion puffing drying (EPD), determine the changes of texture and water soluble ... [more ▼]

The objectives of this research are to discriminate the overall quality level of peach and nectarine chips prepared by explosion puffing drying (EPD), determine the changes of texture and water soluble pectin (WSP) during EPD processing and study the anticancer activity of WSP on malignant mesothelioma (MM). Principle component analysis (PCA), Analytic hierarchy process (AHP), K-mean cluster and Discriminant analysis (DA) are used to distinguish the overall quality level of peach and nectarine chips and get the characteristic evaluation indicators, which of them (e. g. rehydration ratio and expansion ratio) are corresponding to texture properties of dehydrated products. Additionally, biochemical changes of the cell wall (e. g. pectin) are also related to texture changes. The investigate on the changes of texture and WSP at different stages of EPD processing in which osmotic dehydration (OD) was used as the pretreatment, show that OD with the appropriated concentration can improve the texture quality of dried products. The drying processing causes the degradation and structure modification of WSP, which can induce apoptosis in MM cells. EPD technology can be carried out as a potential pathway on modification of pectin, which may contribute to the development of a potential therapy against MM. [less ▲]

Detailed reference viewed: 40 (2 ULiège)
Full Text
Peer Reviewed
See detailA palaeoecological model for the late Mesoproterozoic–early Neoproterozoic Atar/El Mreïti Group, Taoudeni Basin, Mauritania, northwestern Africa
Beghin, Jérémie ULiege; Guilbaud, Romain; Poulton, Simon W. et al

in Precambrian Research (2017), 299

Reconstructing the spatial distribution of early eukaryotes in palaeoenvironments through Proterozoic sedimentary basins provides important information about their palaeoecology and taphonomic conditions ... [more ▼]

Reconstructing the spatial distribution of early eukaryotes in palaeoenvironments through Proterozoic sedimentary basins provides important information about their palaeoecology and taphonomic conditions. Here, we combine the geological context and a reconstruction of palaeoenvironmental redox conditions (using iron speciation) with quantitative analysis of microfossil assemblages (eukaryotes andincertae sedis), to provide the first palaeoecological model for the Atar/El Mreïti Group of the Taoudeni Basin. Our model suggests that in the late Mesoproterozoic–early Neoproterozoic, the availability of both molecular oxygen and nutrients controlled eukaryotic diversity, higher in oxic shallow marginal marine environments, while coccoidal colonies and benthic microbial mats dominated respectively in anoxic iron-rich and euxinic waters during marine highstands or away from shore where eukaryotes are lower or absent. [less ▲]

Detailed reference viewed: 23 (2 ULiège)
See detailIntraspecific variation of Zn hyperaccumulation in Arabidopsis halleri populations
Schvartzman Echenique, Maria Sol ULiege; Corso, Massimiliano; Fataftah, Nazeer ULiege et al

Conference (2017, July 19)

Detailed reference viewed: 28 (2 ULiège)
Peer Reviewed
See detailItem purification versus adjustments for multiple comparisons in DIF detection
Drabinova, Adela; Martinkova, Patricia; Magis, David ULiege

Poster (2017, July 18)

Detailed reference viewed: 25 (1 ULiège)
Full Text
Peer Reviewed
See detailCompte-rendu de l'ouvrage de J. van der Steen: Memory Wars in the Low Countries, 1566-1700
Regibeau, Julien ULiege

in Émulations. Revue des jeunes chercheuses et chercheurs en sciences sociales (2017)

Detailed reference viewed: 33 (3 ULiège)