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See detailImpact of pollen resources drift on common bumblebees in NW Europe
Roger, N.; Moerman, R.; Carvalheiro, L. G. et al

in Global Change Biology (2017), 23(1), 68-76

Several bee species are experiencing significant population declines. As bees exclusively rely on pollen for development and survival, such declines could be partly related to changes in their host plant ... [more ▼]

Several bee species are experiencing significant population declines. As bees exclusively rely on pollen for development and survival, such declines could be partly related to changes in their host plant abundance and quality. Here, we investigate whether generalist bumblebee species, with stable population trends over the past years, adapted their diets in response to changes in the distribution and chemical quality of their pollen resources. We selected five common species of bumblebee in NW Europe for which we had a precise description of their pollen diet through two time periods (‘prior to 1950’ and ‘2004–2005’). For each species, we assessed whether the shift in their pollen diet was related with the changes in the suitable area of their pollen resources. Concurrently, we evaluated whether the chemical composition of pollen resources changed over time and experimentally tested the impact of new major pollen species on the development of B. terrestris microcolonies. Only one species (i.e. B. lapidarius) significantly included more pollen from resources whose suitable area expanded. This opportunist pattern could partly explain the expansion of B. lapidarius in Europe. Regarding the temporal variation in the chemical composition of the pollen diet, total and essential amino acid contents did not differ significantly between the two time periods while we found significant differences among plant species. This result is driven by the great diversity of resources used by bumblebee species in both periods. Our bioassay revealed that the shift to new major pollen resources allowed microcolonies to develop, bringing new evidence on the opportunist feature of bumblebee in their diets. Overall, this study shows that the response to pollen resource drift varies among closely related pollinators, and a species-rich plant community ensures generalist species to select a nutrient-rich pollen diet. © 2016 John Wiley & Sons Ltd [less ▲]

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See detailImpact of polyunsaturated fatty acid degradation on survival and acidification activity of freeze-dried Weissella paramesenteroides LC11 during storage
Yao, Amenan Anastasie ULg; Coulibaly, Ibourahema ULg; Lognay, Georges ULg et al

in Applied Microbiology & Biotechnology (2008), 79(6), 1045-1052

Abstract The impact of polyunsaturated fatty acid (PUFA) degradation on the survival and acidification activity of freeze-dried Weissella paramesenteroides LC11 was investigated over 90-days storage at 4 ... [more ▼]

Abstract The impact of polyunsaturated fatty acid (PUFA) degradation on the survival and acidification activity of freeze-dried Weissella paramesenteroides LC11 was investigated over 90-days storage at 4 °C or 20 °C in vacuumsealed aluminium foil or glass tubes with two water activities (aw=0.11 or 0.23). Colony counts, acidification activity (% lactic acid/g), linoleic/palmitic (18:2/16:0) or linolenic/palmitic (18:3/16:0) ratio by gas chromatography and 18:2 or 18:3 oxylipins by reversed phase-high performance liquid chromatography were determined. The viable cells, acidification activity and 18:2/16:0 or 18:3/ 16:0 ratio decreased as the storage time increased. The survival, acidification activity and 18:2/16:0 or 18:3/16:0 ratio were greatest for the freeze-dried strain held in vacuum-sealed aluminium foil at 4 °C. The 18:2/16:0 or 18:3/16:0 ratio decrease was correlated with the accumulation of 18:2 or 18:3 oxylipins during storage in glass tubes. Hydroperoxy PUFAs, hydroxy PUFAs, divinyl ether PUFAs and oxo PUFAs were the main oxylipins identified. A large decrease in the 18:2/16:0 or 18:3/16:0 ratio and a rapid accumulation of oxylipins during storage might be enough to cause high cell death and loss of metabolic activity. These results provide further experimental support for the hypothesis that lipid oxidation and survival or activity of freeze-dried bacteria might be related. [less ▲]

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See detailImpact of poor adherence to bisphosphonates therapy on hip fracture risk in osteoporotic women
Rabenda, Véronique ULg; Fabri, Véronique; Mertens, Raf et al

in Arthritis and Rheumatism (2007, September), 56(number 9 (suppl.)), 271

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See detailImpact of poplar trees on the soil water dynamics of a maize field in West-Flanders
Coussement, Tom; Janssens, Pieter; Elsen, Annemie et al

Conference (2017, February 15)

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See detailImpact of population history on Viola calaminaria conservation, an endemic species of calamine sites
Bizoux, Jean-Philippe ULg; Mahy, Grégory ULg

Conference (2011, June)

The zinc violet, Viola calaminaria is a threatened species, endemic to calamine sites in Belgium and West Germany. Since the end of 19th century, the V. calaminaria habitat network have exhibited a huge ... [more ▼]

The zinc violet, Viola calaminaria is a threatened species, endemic to calamine sites in Belgium and West Germany. Since the end of 19th century, the V. calaminaria habitat network have exhibited a huge dynamics, with creation of new habitats resulting from industrial pollution and destruction of habitats by urbanisation and site remediation. In the present study, we analysed the effect of population history (recent/ancient population) on genetic diversity, fitness and reproductive success in order to discuss conservation strategies for the species. Recently founded populations exhibited similar level of genetic diversity (Hs) as ancient populations but showed a lower genetic differentiation among population (Fst). No indication of strong founder effects in recently established populations was detected. Plant fitness (seed set and germination percentage) was higher in recent populations while other reproductive traits (vegetative density, flower density, fructification percentage) did not differ according to population history. Results suggest that the creation of habitats through human activities can provide new opportunities for conservation of this species. In increasingly disturbed environments, this indicates that, at least for some species, conservation strategies should not focus solely on traditional and natural habitats but also consider the potential benefits offered by modified landscapes. [less ▲]

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See detailImpact of Pre-Transplant Anti-T Cell Globulin (ATG) on Immune Recovery after Myeloablative Allogeneic Peripheral Blood Stem Cell Transplantation.
SERVAIS, Sophie ULg; Menten-Dedoyart, Catherine; Beguin, Yves ULg et al

in PloS one (2015), 10(6), 0130026

BACKGROUND: Pre-transplant infusion of rabbit anti-T cell globulin (ATG) is increasingly used as prevention of graft-versus-host disease (GVHD) after allogeneic peripheral blood stem cell transplantation ... [more ▼]

BACKGROUND: Pre-transplant infusion of rabbit anti-T cell globulin (ATG) is increasingly used as prevention of graft-versus-host disease (GVHD) after allogeneic peripheral blood stem cell transplantation (PBSCT). However, the precise impact of pre-transplant ATG on immune recovery after PBSCT is still poorly documented. METHODS: In the current study, we compared immune recovery after myeloablative PBSCT in 65 patients who either received (n = 37) or did not (n = 28) pre-transplant ATG-Fresenius (ATG-F). Detailed phenotypes of circulating T, B, natural killer (NK) and invariant NKT (iNKT) cells were analyzed by multicolor flow cytometry at serial time-points from day 40 to day 365 after transplantation. Thymic function was also assessed by sjTREC quantification. Serious infectious events were collected up to 2 years post-transplantation. RESULTS: Pre-transplant ATG-F had a prolonged (for at least up to 1-year) and selective negative impact on the T-cell pool, while it did not impair the recovery of B, NK nor iNKT cells. Among T cells, ATG-F selectively compromised the recovery of naive CD4+, central memory CD4+ and naive CD8+ cells, while it spared effector memory T and regulatory T cells. Levels of sjTRECs were similar in both cohorts at 1-year after PBSCT, suggesting that ATG-F unlikely impaired thymopoiesis at long-term after PBSCT. Finally, the incidence and rate of serious infections were similar in both groups, while ATG-F patients had a lower incidence of grade II-IV acute graft-versus-host disease. CONCLUSIONS: Pre-transplant ATG-F induces long-lasting modulation of the circulating T-cell pool after myeloablative PBSCT, that may participate in preventing graft-versus-host disease without deeply compromising anti-pathogen defenses. [less ▲]

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See detailImpact of pre-treatment processing on cereal by-products valorisation through enzymatic extraction of ferulic acid.
Barberousse, Hélène; Roiseux, Olivier; Deroanne, Claude et al

Poster (2008, June)

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See detailThe impact of preexisting semantic integration on associative memory in normal aging
Bastin, Christine ULg

in Proceedings of the 6th International Conference on Memory (2016)

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See detailImpact of preoperative use of P2Y12 receptor inhibitors on clinical outcomes in cardiac and non-cardiac surgery: A systematic review and meta-analysis.
Siller-Matula, Jolanta M.; Petre, Alexandra; Delle-Karth, Georg et al

in European heart journal. Acute cardiovascular care (2015)

OBJECTIVE: To review systematically the evidence and perform a meta-analysis of benefits and risks associated with use of P2Y12 receptor inhibitors in coronary artery bypass graft-, non-cardiac- and ... [more ▼]

OBJECTIVE: To review systematically the evidence and perform a meta-analysis of benefits and risks associated with use of P2Y12 receptor inhibitors in coronary artery bypass graft-, non-cardiac- and device surgery. DATA SELECTION AND ANALYSIS: We performed a meta-analysis of published studies. Patients with preoperative use of clopidogrel, ticagrelor or prasugrel (late discontinuation: <5 days before surgery or no discontinuation) were compared with patients without preoperative use of the respective drug (early discontinuation: 5 days before surgery or no users of P2Y12 receptor inhibitors). Outcomes evaluated were re-operation for major bleeding, death, myocardial infarction, combined major adverse cardiac events (MACEs) and major haematoma. Using a random effect model, relative risks (RRs) and 95% confidence intervals (CI) were calculated for each outcome. RESULTS: Fifty-four studies met the selection criteria and included 50,048 patients. Preoperative use of clopidogrel on top of aspirin in patients undergoing coronary artery bypass graft was associated with a 2.5-fold increased risk of re-operation for bleeding (95% CI: 1.92-3.25; p<0.001) and a 1.47-fold increased risk of death (95% CI: 1.25-1.72; p<0.001), but did not diminish the risk for myocardial infarction (RR: 0.96; 95% CI: 0.75-1.25; p=0.18) or MACE (RR: 1.16; 95% CI: 0.90--1.50; p=0.30). In patients undergoing non-cardiac surgery, preoperative use of clopidogrel increased the RR of re-operation for major bleeding by 2.05-fold (95% CI: 1.13-3.73; p=0.002) but did not reduce the RR for MACE or death. Clopidogrel use during cardiac device implantation raised the RR for procedure-related haematoma by 3.0-fold (95% CI: 1.30--6.94; p=0.001). Whereas preoperative ticagrelor use did not increase the risk for mortality (RR: 1.03; 95% CI: 0.49-2.14), preoperative prasugrel use tended to increase the risk for death (RR: 5.06; 95% CI: 0.54-47.65). CONCLUSION: Preoperative exposure to clopidogrel on top of aspirin did not reduce the risk of MACE but was associated with increased risk of bleeding and mortality. [less ▲]

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See detailImpact of pro-oxidant agents on the morula-blastocyst transition in bovine embryos.
Feugang, Jean-Magloire; Donnay, Isabelle; Mermillod, Pascal et al

in Molecular Reproduction and Development (2005), 71(3), 339-46

Exposing day 5 bovine morulae to reactive oxygen species induces a delayed degeneration of some blastocysts on day 8 post-insemination (pi) but without affecting the blastocyst rates. The aim of this ... [more ▼]

Exposing day 5 bovine morulae to reactive oxygen species induces a delayed degeneration of some blastocysts on day 8 post-insemination (pi) but without affecting the blastocyst rates. The aim of this study was to characterize the resisting and the degenerating population of blastocysts. The kinetics of degeneration of the embryos exposed to the two pro-oxidant agents: 2,2'-azobis (2-amidinopropane) dihydrochloride (AAPH) and buthionine sulfoximine (BSO) was evaluated using time-lapse cinematography. With both agents the first signs of degeneration appeared at day 7.5 pi but the duration of the degeneration process was shorter in presence of AAPH than BSO (4.2 vs. 12.5 hr, ANOVA, P < 0.05). The resisting blastocysts derived from morulae with a larger diameter (mean diameter: 161 vs. 154 microm, ANOVA, P < 0.05) and showed an earlier cavitation (135 vs. 142 hpi, P < 0.05) than the degenerating ones. The profile of protein neosynthesis at day 7 was not affected by the treatment. The proportion of male embryos was more important in the resisting than in the degenerating population (70 vs. 55%, chi2, P < 0.05) especially when the stress was induced by AAPH. The quality of the resisting embryos, measured by the total cell number and the rate of apoptosis, did not seem to be affected when compared to control embryos. In conclusion, resistance to oxidative stress seems related to the kinetics of development and/or the sex of the embryos. Resisting embryos apparently display a quality similar to untreated embryos. [less ▲]

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See detailImpact of prosthesis-patient mismatch on mitral regurgitation after aortic valve replacement
Unger, P.; Magne, Julien ULg; Vanden Eynden, F. et al

in Heart (2010), 96(20), 1627-1632

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See detailImpact of prosthesis-patient mismatch on short-term mortality following mitral valve replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2008)

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See detailImpact of Prosthesis-Patient Mismatch on Short-term Mortality Following Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2008)

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See detailImpact of Prosthesis-Patient Mismatch on Short-term Mortality Following Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2009)

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See detailImpact of prosthesis-patient mismatch on survival after mitral valve replacement
Magne, Julien ULg; Dumesnil, J. G.; Tanné, D. et al

in Circulation (2007), 115(11), 1417-1425

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See detailImpact of Prosthesis-Patient Mismatch on Survival After Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2006)

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See detailImpact of Prosthesis-Patient Mismatch on Survival following Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2006)

Detailed reference viewed: 18 (1 ULg)