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See detailFonction publique et ressources humaines. Communes de la Province de Luxembourg
Grandjean, Geoffrey ULiege

Conference (2017, November 06)

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See detailStéréotypes du racisme ordinaire
Debras, François ULiege

Conference given outside the academic context (2017)

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See detailEnhanced stabilization of water-scCO2 interface by block-like spontaneous gradient copolymers
Liu, Xuan; Wang, Mingxi; Harrisson, Simon et al

in ACS Sustainable Chemistry & Engineering (2017), 5(11), 9645-9650

There is an increasing interest in the specific physicochemical properties of gradient copolymers at interfaces. In this work, the phase behavior and interfacial properties of amphiphilic gradient ... [more ▼]

There is an increasing interest in the specific physicochemical properties of gradient copolymers at interfaces. In this work, the phase behavior and interfacial properties of amphiphilic gradient copolymers at the water/CO2 interface are explored and compared to that of diblock copolymer counterparts. It is observed that spontaneous amphiphilic block-like gradient copolymers made of N,N-dimethylacrylamide, vinyl pivalate, and vinyl acetate exhibit slightly lower cloud point pressures in supercritical carbon dioxide (scCO2) than the corresponding diblock copolymers. Much more pronounced differences are established at the water/scCO2 interface, with larger critical aggregation concentration (CAC), much faster adsorption kinetics and equilibration, and lower surface tension for gradient copolymers. RAFT/MADIX polymerization allows the control of molar mass, composition, and microstructure of the copolymers of the study. These findings shed light on how microstructural control in amphiphilic copolymers can give access to a new range of macromolecular emulsifiers for CO2 media with improved properties. [less ▲]

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See detailLes expérimentations de "L'homme à la caméra" de Dziga Vertov
Tomasovic, Dick ULiege

Conference given outside the academic context (2017)

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See detailResource efficiency and circularity in engineering higher education
Attia, Shady ULiege

in Moula, Munjur; Pekka, Oinas; Jaana, Sorvari (Eds.) et al Constructing A Green Circular Society (2017)

Changing engineering student’s knowledge, skills and attitudes about resource efficiency, regenerative design and circularity in the built environment is a serious challenge. The development of ... [more ▼]

Changing engineering student’s knowledge, skills and attitudes about resource efficiency, regenerative design and circularity in the built environment is a serious challenge. The development of engineering students’ capabilities to design within a circular economy paradigm in higher education can foster sustainable behaviour and contribute to the global sustainable development global agenda. This chapter presents the experience of introducing the concept of regenerative design within a project oriented design studio for undergraduates. The regenerative design objective and principles are used a method to develop engineers capabilities to design within a circular economy paradigm. The aim of the study is to evaluate the adoption of circular economy principles and their influence on the decision making and final outcomes. A state of the art provides an over view on the similar approaches to incorporate sustainability into university courses and curricula with a focus out case study to make a step forward. The chapter describes a thorough evaluation of the course and report the outcomes in the form of projects evaluation and students’ feedback, interviews and surveys, in order to assess the students’ knowledge uptake, learned skills and design capabilities. Students completed a knowledge, skills, and attitudes questionnaire before the curriculum, after the final learning experience, and one year later. This chapter provides insights into the effectiveness of introducing circularity in an engineering course. Based on the lessons learned from our case study we provide a discussion on the main challenges such as complexity, decision making uncertainty and interdisciplinarity, institutional reforms in engineering higher education. Finally, the chapter presents a range of tangible and realistic recommendations to better incorporate resource efficiency and circularity in engineering higher education. [less ▲]

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See detailApproche pluridimensionnelle de l’évaluation en enseignement supérieur
Hanzen, Christian ULiege

Learning material (2017)

Les objectifs spécifiques de cette formation de 14 heures sont 1. définir docimologie, édumétrie, évaluation, connaissances, savoirs, compétences, formatif, certificatif, self-assessment 2. citer les ... [more ▼]

Les objectifs spécifiques de cette formation de 14 heures sont 1. définir docimologie, édumétrie, évaluation, connaissances, savoirs, compétences, formatif, certificatif, self-assessment 2. citer les différentes facettes de l’évaluation 3. donner des exemples d’évaluation 4. citer les 6 niveaux de la pyramide de Bloom 5. commenter les 6 niveaux de la pyramide de Bloom 6. comparer les objectifs de connaissance, de compréhension et d’application 7. commenter les biais liés à la copie, au correcteur et à l’évalué 8. énoncer les trois aspects de la concordance 9. faire le choix d’un type d’évaluation adaptée aux domaines et niveaux 10. créer une question QCM 11. commenter le barême d’évaluation d’une QCM SGI DC 12. énoncer les différentes étapes d’un cycle de qualité d’une évaluation 13. comparer avantages et inconvénients des QROL, QROC et oraux 14. expliquer l’intérêt d’une évaluation de l’enseignement par les étudiants [less ▲]

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See detailCoding of papers submitted to the 14th Congresso Brasileiro de Medicina de Família e Comunidade
Augusto, Daniel; Rebolho, Ricardo; Jamoulle, Marc ULiege et al

Conference (2017, November 05)

Introduction: The intention of codifying the 14th CBMFC's work with the use of 3CGP (Core Concept Classification in General Practice Family Medicine) appeared during the 21st WONCA World Conference of ... [more ▼]

Introduction: The intention of codifying the 14th CBMFC's work with the use of 3CGP (Core Concept Classification in General Practice Family Medicine) appeared during the 21st WONCA World Conference of Family Physicians, when members of the organizing committee of the 14th CBMFC were able to participate in an activity given by Dr Marc Jamoulle on the subject and realized how important it could be to use 3CGP. It consists of using the International Classification of Primary Care (CIAP-2) and the Q-Codes to classify the contents of abstracts submitted to the congress. CBMFCs are large events, which usually receive a substantial number of abstracts. The experience of using 3CGP in an event of this magnitude can have a great impact for the development of the specialty in the country, besides having a pioneering character, contributing for 3CGP to become an international standard in the congresses of family and community medicine. Objectives: Assist the author in the choice of theme; Teaching how to index; Contribute to updating the Q Codes; Manage the congress; Contribute in the management of knowledge in family and community medicine. Method: This is an action research experiment that will consist of the coding of all abstracts submitted to the 14th CBMFC with the use of 3CGP. Authors will be introduced to the classification system by means of an introductory text and should submit their work on the event site using a system that already allows them to perform the encoding of the abstract. The data obtained in this process will be evaluated by members of the organizing committee of the 14th CBMFC, who will be in charge of synthesizing it. [less ▲]

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See detailDevelopment and evaluation of injectable nanosized drug delivery systems for apigenin
Karim, Reatul ULiege; Palazzo, Claudio ULiege; Laloy, Julie et al

in International Journal of Pharmaceutics (2017), 532(2), 757-768

The purpose of this study was to develop different injectable nanosized drug delivery systems (NDDSs) i.e. liposome, lipid nanocapsule (LNC) and polymeric nanocapsule (PNC) encapsulating apigenin (AG) and ... [more ▼]

The purpose of this study was to develop different injectable nanosized drug delivery systems (NDDSs) i.e. liposome, lipid nanocapsule (LNC) and polymeric nanocapsule (PNC) encapsulating apigenin (AG) and compare their characteristics to identify the nanovector(s) that can deliver the largest quantity of AG while being biocompatible. Two liposomes with different surface characteristics (cationic and anionic), a LNC and a PNC were prepared. A novel tocopherol modified poly(ethylene glycol)-b-polyphosphate block-copolymer was used for the first time for the PNC preparation. The NDDSs were compared by their physicochemical characteristics, AG release, storage stability, stability in serum, complement consumption and toxicity against a human macrovascular endothelial cell line (EAhy926). The diameter and surface charge of the NDDSs were comparable with previously reported injectable nanocarriers. The NDDSs showed good encapsulation efficiency and drug loading. Moreover, the NDDSs were stable during storage and in fetal bovine serum for extended periods, showed low complement consumption and were non-toxic to EAhy926 cells up to high concentrations. Therefore, they can be considered as potential injectable nanocarriers of AG. Due to less pronounced burst effect and extended release characteristics, the nanocapsules could be favorable approaches for achieving prolonged pharmacological activity of AG using injectable NDDS. [less ▲]

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See detailOstéochondrites
Kaux, Jean-François ULiege; Maillard, Bérengère

Conference (2017, November 04)

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See detailDark ice dynamics of the south-west Greenland Ice Sheet
Tedstone, A.; Bamber, J.; Cook, J. et al

in Cryosphere (The) (2017), 11

Runoff from the Greenland Ice Sheet (GrIS) has increased in recent years due largely to changes in atmospheric circulation and atmospheric warming. Albedo reductions resulting from these changes have ... [more ▼]

Runoff from the Greenland Ice Sheet (GrIS) has increased in recent years due largely to changes in atmospheric circulation and atmospheric warming. Albedo reductions resulting from these changes have amplified surface melting. Some of the largest declines in GrIS albedo have occurred in the ablation zone of the south-west sector and are associated with the development of dark ice surfaces. Field observations at local scales reveal that a variety of light-absorbing impurities (LAIs) can be present on the surface, ranging from inorganic particulates to cryoconite materials and ice algae. Meanwhile, satellite observations show that the areal extent of dark ice has varied significantly between recent successive melt seasons. However, the processes that drive such large interannual variability in dark ice extent remain essentially unconstrained. At present we are therefore unable to project how the albedo of bare ice sectors of the GrIS will evolve in the future, causing uncertainty in the projected sea level contribution from the GrIS over the coming decades. Here we use MODIS satellite imagery to examine dark ice dynamics on the south-west GrIS each year from 2000 to 2016. We quantify dark ice in terms of its annual extent, duration, intensity and timing of first appearance. Not only does dark ice extent vary significantly between years but so too does its duration (from 0 to > 80 % of June–July–August, JJA), intensity and the timing of its first appearance. Comparison of dark ice dynamics with potential meteorological drivers from the regional climate model MAR reveals that the JJA sensible heat flux, the number of positive minimum-air-temperature days and the timing of bare ice appearance are significant interannual synoptic controls. We use these findings to identify the surface processes which are most likely to explain recent dark ice dynamics. We suggest that whilst the spatial distribution of dark ice is best explained by outcropping of particulates from ablating ice, these particulates alone do not drive dark ice dynamics. Instead, they may enable the growth of pigmented ice algal assemblages which cause visible surface darkening, but only when the climatological prerequisites of liquid meltwater presence and sufficient photosynthetically active radiation fluxes are met. Further field studies are required to fully constrain the processes by which ice algae growth proceeds and the apparent dependency of algae growth on melt-out particulates. [less ▲]

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See detailLa solidaridad con México no tiene fronteras
Lara Guerrero, Larisa Viridiana ULiege

Article for general public (2017)

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See detailComparison of faecal microbiota of horses suffering from atypical myopathy and healthy co-grazers
Cerri, Simona ULiege; Taminiau, Bernard ULiege; Votion, Dominique ULiege et al

Poster (2017, November 02)

Objectives: To characterize faecal microbiota of horses with atypical myopathy (AM) compared with healthy co-grazers (HcG). Methods: Fresh faecal samples were obtained from 6 horses (1 stallion, 3 ... [more ▼]

Objectives: To characterize faecal microbiota of horses with atypical myopathy (AM) compared with healthy co-grazers (HcG). Methods: Fresh faecal samples were obtained from 6 horses (1 stallion, 3 geldings and 2 females; mean age of 11.810 years) with confirmed AM and 6 HcG (4 geldings and 2 females; mean age of 13.68 years) during autumn-2016 and spring-2017 AM outbreaks in Belgium. Bacterial taxonomy profiling obtained by 16S amplicon sequencing of faeces was used to identify differentially distributed bacterial taxa between AM and HcG. Results were statistically compared using Welch's t-test with STAMP software. Results: A total of 90,407 sequences were analysed and clustered to 8,066 operational taxonomic units. Bacterial populations were distributed between 17 phylas, although 20% of sequences could not be attributed to an existing phylum. Horses with AM harboured a significantly higher relative abundance of Ruminococcaeae family with a significantly lower Lachnospiraceae when compared to HcG. Discussion: AM is caused by hypoglycin A intoxication, but only a part of horses pasturing in the same toxic environment develops the pathology, suggesting that there may be protective factors at the horse level. The results of this study show significant differences in faecal microbiota between AM cases and HcG, which could suggest that microbiota could play a role in the development or prevention of clinical disease. Conclusions: Results demonstrate that microbiota of AM affected horses is significantly different compared to HcG. Significance: Microbiome could influence the development of AM, but this role deserves further investigation. [less ▲]

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See detailRaman Chemical Imaging in Kidney Stone Analysis
Castiglione, Vincent ULiege; Sacre, Pierre-Yves ULiege; CAVALIER, Etienne ULiege et al

Poster (2017, November 02)

Background: The structure of kidney stones might provide clinical useful information in addition to the stone composition. The Raman chemical imaging (RCI) is a new technology used for the production of ... [more ▼]

Background: The structure of kidney stones might provide clinical useful information in addition to the stone composition. The Raman chemical imaging (RCI) is a new technology used for the production of two-dimensions maps of the constituents' distribution in samples. We aimed at determining the use of RCI in urinary stone analysis. Methods: Twelve calculi were analyzed by RCI using a confocal Raman microspectrophotometer. They were selected according to their heterogeneous composition and morphology. Prior to the analysis, samples were sliced and milled in order to detect the nucleus of the stones and having a smooth surface. RCI was performed on the whole section of stones. Once acquired, the data were baseline corrected and analyzed by MCR-ALS. Results were then compared to the spectra obtained by Fourier Transform Infrared spectroscopy, the gold standard method for the determination of urolithiasis composition. Results: RCI succeeded in identifying all the chemical components contained in each sample, including monohydrate and dihydrate calcium oxalate, anhydrous and dihydrate uric acid, apatite, struvite, brushite, whitlockite and ammonium urate. However, proteins couldn't be detected because of the huge autofluorescence background and the small concentration of these poor Raman scatterers. Carbapatite and calcium oxalate were correctly detected even when they represented less than 5 percent of the whole stones, allowing the detection of very small structures like Randall's plaques. Moreover, RCI provided the distribution of components within the stones. The nuclei were accurately identified, as well as thin layers of other components. Conversion of dihydrate to monohydrate calcium oxalate was correctly observed in the center of one sample. Conclusion: RCI showed a good accuracy in comparison with infrared spectroscopy in identifying components of kidney stones. In addition, RCI is nondestructive enabling the storage of samples. This analysis was also useful in determining the organization of components within stones, which help locating constituents in low quantity, such as nuclei. However, this analysis is time-consuming, which makes it more suitable for research studies rather than routine analysis. [less ▲]

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See detailEffects of Transcranial Direct Current Stimulation, Transcranial Pulsed Current Stimulation, and Their Combination on Brain Oscillations in Patients with Chronic Visceral Pain: A Pilot Crossover Randomized Controlled Study.
Thibaut, Aurore ULiege; Russo, Cristina; Hurtado-Puerto, Aura-Maria et al

in Frontiers in Neurology (2017)

Objective: Chronic visceral pain (CVP) syndromes are persistently painful disorders with a remarkable lack of effective treatment options. This study aimed at evaluating the effects of different ... [more ▼]

Objective: Chronic visceral pain (CVP) syndromes are persistently painful disorders with a remarkable lack of effective treatment options. This study aimed at evaluating the effects of different neuromodulation techniques in patients with CVP on cortical activity, through electreocephalography (EEG) and on pain perception, through clinical tests. Design:A pilot crossover randomized controlled study. Settings: Out-patient. Subjects: Adults with CVP (>3 months). Methods: Participants received four interventions in a randomized order: (1) transcranial pulsed current stimulation (tPCS) and active transcranial direct current stimulation (tDCS) combined, (2) tPCS alone, (3) tDCS alone, and (4) sham condition. Resting state quantitative electroencephalography (qEEG) and pain assessments were performed before and after each intervention. Results were compared with a cohort of 47 healthy controls. Results: We enrolled six patients with CVP for a total of 21 visits completed. Compared with healthy participants, patients with CVP showed altered cortical activity characterized by increased power in theta, alpha and beta bands, and a significant reduction in the alpha/beta ratio. Regarding tES, the combination of tDCS with tPCS had no effect on power in any of the bandwidths, nor brain regions. Comparing tPCS with tDCS alone, we found that tPCS induced higher increase in power within the theta and alpha bandwidths. Conclusion: This study confirms that patients with CVP present abnormal EEG-indexed cortical activity compared with healthy controls. Moreover, we showed that combining two types of neurostimulation techniques had no effect, whereas the two interventions, when applied individually, have different neural signatures. [less ▲]

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See detailAn X-ray view of HD 166734, a massive supergiant system
Nazé, Yaël ULiege; Gosset, Eric ULiege; Mahy, Laurent ULiege et al

in Astronomy and Astrophysics (2017), 607(A97), 1-10

The X-ray emission of the O+O binary HD 166734 was monitored using Swift and XMM-Newton observatories, leading to the discovery of phase-locked variations. The presence of an f line in the He-like ... [more ▼]

The X-ray emission of the O+O binary HD 166734 was monitored using Swift and XMM-Newton observatories, leading to the discovery of phase-locked variations. The presence of an f line in the He-like triplets further supports a wind-wind collision as the main source of the X-rays in HD 166734. While temperature and absorption do not vary significantly along the orbit, the X-ray emission strength varies by one order of magnitude, with a long minimum state (Δ(φ) 0.1) occurring after a steep decrease. The flux at minimum is compatible with the intrinsic emission of the O-stars in the system, suggesting a possible disappearance of colliding wind emission. While this minimum cannot be explained by eclipse or occultation effects, a shock collapse may occur at periastron in view of the wind properties. Afterwards, the recovery is long, with an X-ray flux proportional to the separation d (in hard band) or to d[SUP]2[/SUP] (in soft band). This is incompatible with an adiabatic nature for the collision (which would instead lead to F[SUB]X[/SUB] ∝ 1 /d), but could be reconciled with a radiative character of the collision, though predicted temperatures are lower and more variable than in observations. An increase in flux around φ 0.65 and the global asymmetry of the light curve remain unexplained, however. Based on observations collected with Swift and the ESA science mission XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member States and the USA (NASA). [less ▲]

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See detailHigh-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b
Delrez, L.; Madhusudhan, N.; Lendl, M. et al

in Monthly Notices of the Royal Astronomical Society (2017), 474(2), 2334-2351

We present sixteen occultation and three transit light curves for the ultra-short period hot Jupiter WASP-103 b, in addition to five new radial velocity measurements. We combine these observations with ... [more ▼]

We present sixteen occultation and three transit light curves for the ultra-short period hot Jupiter WASP-103 b, in addition to five new radial velocity measurements. We combine these observations with archival data and perform a global analysis of the resulting extensive dataset, accounting for the contamination from a nearby star. We detect the thermal emission of the planet in both the $z'$ and $K_{\mathrm{S}}$-bands, the measured occultation depths being 699$\pm$110 ppm (6.4-$\sigma$) and $3567_{-350}^{+400}$ ppm (10.2-$\sigma$), respectively. We use these two measurements together with recently published HST/WFC3 data to derive joint constraints on the properties of WASP-103 b's dayside atmosphere. On one hand, we find that the $z'$-band and WFC3 data are best fit by an isothermal atmosphere at 2900 K or an atmosphere with a low H$_2$O abundance. On the other hand, we find an unexpected excess in the $K_{\mathrm{S}}$-band measured flux compared to these models, which requires confirmation with additional observations before any interpretation can be given. From our global data analysis, we also derive a broad-band optical transmission spectrum that shows a minimum around 700 nm and increasing values towards both shorter and longer wavelengths. This is in agreement with a previous study based on a large fraction of the archival transit light curves used in our analysis. The unusual profile of this transmission spectrum is poorly matched by theoretical spectra and is not confirmed by more recent observations at higher spectral resolution. Additional data, both in emission and transmission, are required to better constrain the atmospheric properties of WASP-103 b. [less ▲]

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See detailSeismic inversion of the solar entropy. A case for improving the standard solar model
Buldgen, Gaël ULiege; Salmon, Sébastien ULiege; Noels-Grötsch, Arlette ULiege et al

in Astronomy and Astrophysics (2017), 607

Context. The Sun is the most constrained and well-studied of all stars. As a consequence, the physical ingredients entering solar models are used as a reference to study all other stars observed in the ... [more ▼]

Context. The Sun is the most constrained and well-studied of all stars. As a consequence, the physical ingredients entering solar models are used as a reference to study all other stars observed in the Universe. However, our understanding of the solar structure is still imperfect, as illustrated by the current debate on the heavy element abundances in the Sun. <BR /> Aims: We provide additional information on the solar structure by carrying out structural inversions of a new physical quantity, a proxy of the entropy of the solar plasma whose properties are very sensitive to the temperature gradient below the convective zone. <BR /> Methods: We use new structural kernels to carry out direct inversions of an entropy proxy of the solar plasma and compare the solar structure to various standard solar models built using various opacity tables and chemical abundances. We also link our results to classical tests commonly found in the literature. <BR /> Results: Our analysis allows us to probe more efficiently the uncertain regions of the solar models, just below the convective zone, paving the way for new in-depth analyses of the Sun taking into account additional physical uncertainties of solar models beyond the specific question of chemical abundances. [less ▲]

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See detailIncreasing plant functional diversity is not the key for supporting pollinators in wildflower strips
Uyttenbroeck, Roel ULiege; Piqueray, Julien; Hatt, Séverin ULiege et al

in Agriculture, Ecosystems & Environment (2017), 249

Intensification of agriculture has been one of the major drivers for biodiversity loss in recent decades. Pollinators, which serve an important role in pollinating crops as well as wild plants, have shown ... [more ▼]

Intensification of agriculture has been one of the major drivers for biodiversity loss in recent decades. Pollinators, which serve an important role in pollinating crops as well as wild plants, have shown a decline in species richness. Flower strips can be used to support pollinators in agro-ecosystems, however the question remains as to how their design can be optimized in order to best benefit pollinators. Increasing plant species diversity has been shown to be beneficial for pollinators, and it is often suggested that functional traits are driving this relationship. Therefore, increasing plant functional diversity could be a tool to support pollinator abundance and diversity. As experimental evidence on this relationship is scarce, we developed a field study with experimental sown flower strips with four functional diversity levels, based on multiple flower traits and with equal plant species richness. We monitored vegetation development, as well as the flower-visiting pollinator community and their interaction networks with flowers. We were able to create a functional diversity gradient while controlling for plant species richness and evenness. However, in contrast to our expectations, pollinator species richness and evenness were not influenced by functional diversity, and increasing functional diversity even resulted in lower flower visitation rates. Network stability metrics showed no effect or negative relationships with functional diversity. We conclude that increasing functional diversity was not the key for supporting pollinators in wildflower strips. Our results also suggest that, for a constant amount of flower resources, increasing plant functional diversity and thus decreasing redundancy of potential pollinator feeding niches, decreases the amount of flower resources present per feeding niche. As pollinator species tended to have less overlap in their feeding niches in flower strips with increased functional diversity, this may lead to a reduction of flower resources available for pollinator species with a more specialized feeding niche. [less ▲]

Detailed reference viewed: 49 (4 ULiège)