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See detailInfluence of response prepotency strength, general working memory resources, and specific working memory load on the ability to inhibit predominant responses: A comparison of young and elderly participants
Grandjean, Julien ULg; Collette, Fabienne ULg

in Brain & Cognition (2011), 77

One conception of inhibitory functioning suggests that the ability to successfully inhibit a predominant response depends mainly on the strength of that response, the general functioning of working memory ... [more ▼]

One conception of inhibitory functioning suggests that the ability to successfully inhibit a predominant response depends mainly on the strength of that response, the general functioning of working memory processes, and the working memory demand of the task (Roberts, Hager, and Heron, 1994). The proposal that inhibition and functional working memory capacity interact was assessed in the present study using two motor inhibition tasks (Go/No-Go and response incompatibility) in young and older participants. The strength of prepotency was assessed with a short or long training phase for the response to be inhibited. The influence of working memory resources was evaluated by administering the tasks in full versus divided attention conditions. The effect of working memory load was manipulated by increasing the number of target and distracter items in each task. Results showed no effect of prepotency strength, whereas dividing attentional resources and increasing working memory load were associated with greater inhibitory effects in both groups and for both tasks. This deleterious effect was higher for older participants, except in the working memory load condition of the Go/No-Go task. These results suggest an interactive link between working memory and response inhibition by showing that taxing working memory resources increases the difficulty of inhibiting prepotent responses in younger and older subjects. The additional detrimental effect of these factors on healthy elderly subjects was related to their decreased cognitive resources and to their shorter span size. [less ▲]

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See detailInfluence of rhizobacterial volatile compounds on growth and root system architecture of Brachypodium distachyon (L.) Beauv.
Mendaluk, Magdalena ULg; Varin, Sébastien; Baudson, Caroline ULg et al

Poster (2013, February 08)

Many rhizobacterial strains are classified as plant growth-promoting rhizobacteria (PGPR) and are potentially useful to enhance plant fitness and productivity. Among the mechanisms by which PGPR improve ... [more ▼]

Many rhizobacterial strains are classified as plant growth-promoting rhizobacteria (PGPR) and are potentially useful to enhance plant fitness and productivity. Among the mechanisms by which PGPR improve plant growth, the emission of volatile organic compounds (VOCs) and their biological impacts on plants remain little documented. The aim of this work is to evaluate the growth promotion ability of 19 bacterial strains on the model grass Brachypodium distachyon Bd21 (Bd21), with a focus on this peculiar mode of interaction. A collection of 19 strains was selected for their known growth promotion potential. The impact of the rhizobacteria on the model grass was studied using an in vitro cocultivation system allowing interactions through VOCs without physical contact between plants and bacteria. The results show that the VOCs of several strains promote total biomass production, modulate biomass partitioning and affect shoot and root architecture of Bd21. The effects of the PGPR strains emitting different volatile blends were investigated via principal component analysis coupled to clustering and univariate analysis to unravel their biological effects. On the basis of volatile emissions and of their effects on plant growth, two strains have been selected in order to evaluate such interactions using an ex vitro system. The set-up of this system is in progress. [less ▲]

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See detailInfluence of rhizobacterial volatiles on the root system architecture and the production and allocation of biomass in the model grass Brachypodium distachyon (L.) P. Beauv.
Delaplace, Pierre ULg; Delory, Benjamin ULg; Baudson, Caroline ULg et al

in BMC Plant Biology (2015), 15(195),

Background Plant growth-promoting rhizobacteria are increasingly being seen as a way of complementing conventional inputs in agricultural systems. The effects on their host plants are diverse and include ... [more ▼]

Background Plant growth-promoting rhizobacteria are increasingly being seen as a way of complementing conventional inputs in agricultural systems. The effects on their host plants are diverse and include volatile-mediated growth enhancement. This study sought to assess the effects of bacterial volatiles on the biomass production and root system architecture of the model grass Brachypodium distachyon (L.) Beauv. Results An in vitro experiment allowing plant-bacteria interaction throughout the gaseous phase without any physical contact was used to screen 19 bacterial strains for their growth-promotion ability over a 10-day co-cultivation period. Five groups of bacteria were defined and characterised based on their combined influence on biomass production and root system architecture. The observed effects ranged from unchanged to greatly increased biomass production coupled with increased root length and branching. Primary root length was increased only by the volatile compounds emitted by Enterobacter cloacae JM22 and Bacillus pumilus T4. Overall, the most significant results were obtained with Bacillus subtilis GB03, which induced an 81% increase in total biomass, as well as enhancing total root length, total secondary root length and total adventitious root length by 88.5, 201.5 and 474.5%, respectively. Conclusions This study is the first report on bacterial volatile-mediated growth promotion of a grass plant. Contrasting modulations of biomass production coupled with changes in root system architecture were observed. Most of the strains that increased total plant biomass also modulated adventitious root growth. Under our screening conditions, total biomass production was strongly correlated with the length and branching of the root system components, except for primary root length. An analysis of the emission kinetics of the bacterial volatile compounds is being undertaken and should lead to the identification of the compounds responsible for the observed growth-promotion effects. Within the context of the inherent characteristics of our in vitro system, this paper identifies the next critical experimental steps and discusses them from both a fundamental and an applied perspective. [less ▲]

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See detailInfluence of rhizosphere-specific parameters on surfactin production by Bacillus subtilis.
Nihorimbere, V.; Fickers, Patrick ULg; Thonart, Philippe ULg et al

Conference (2008, September)

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See detailInfluence of rhizosphere-specific parameters on surfactin production by Bacillus subtilis.
Ongena, MARC ULg; Nihorimbere, Venant; Fickers, Patrick ULg et al

in Bulletin OILB/SROP = IOBC/WPRS Bulletin (2009), (43), 317-320

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See detailInfluence of salt restriction in untreated essential hypertension patients
Krzesinski, Jean-Marie ULg; Du, F.; Pequeux, L. et al

in Journal of Hypertension (1992), 10(10), 1297-1298

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See detailInfluence of sampling effort on saproxylic beetle diversity assessment: Implications for insect monitoring studies in European temperate forests
Parmain, G.; Dufrêne, Marc ULg; Brin, A. et al

in Agricultural & Forest Entomology (2013)

Saproxylic beetle diversity monitoring provides a tool for estimating the efficiency of forest conservation measures. Flight interception traps are commonly employed to monitor beetle assemblages ... [more ▼]

Saproxylic beetle diversity monitoring provides a tool for estimating the efficiency of forest conservation measures. Flight interception traps are commonly employed to monitor beetle assemblages, although little explicit knowledge of the efficiency of this trapping method is available. The present study investigated how slight changes in sampling effort can influence species richness and species composition of assemblages in data sets from standard window-flight traps. At both trap and plot levels, an additional year or an additional trap provided a 50% increase in the number of species detected (a 75% increase for rare species) and resulted in a different estimated composition of the assemblages. Adding 2 or 3years of sampling gave twice as many species and resulted in assemblages that were 50% dissimilar. Increases in the detection of species and the dissimilarity of assemblages were similarly affected along a gradient of forest conditions, suggesting that changes in sampling effort were not affected by forest condition. At the forest level, year or trap replication provided smaller increases in species richness (31% and 25%, respectively). Within sites, distance measures in species composition between traps did not differ significantly when based on 1 or 2years of data. Using two traps per plot compared with one trap influenced comparisons between stand types, based on species richness, in 25% of the cases. Species detection was similarly increased by either year replication or trap replication. The results of the present study highlight the significant role played by finescale patterns of habitat structure and inter-annual variation with respect to determining catch size and assemblages of saproxylic species. © 2013 The Royal Entomological Society. [less ▲]

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See detailInfluence of sedatives, anticonvulsants and a negative chronotrope on transcranial doppler ultrasonography
de Laat, B. W. G. A.; Gommeren, Kris ULg; Denies, S. et al

in Proceedings of the 22nd ECVIM-CA Congress (2012, September)

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See detailThe influence of sediment size, relative grain size and channel slope on initiation of sediment motion in boulder bed rivers. A lichenometric study
Gob, F.; Bravard, J. P.; Petit, François ULg

in Earth Surface Processes & Landforms (2010), 35

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See detailInfluence of sedimentary setting on the use of magnetic susceptibility : examples from the Devonian of Belgium
Da Silva, Anne-Christine ULg; Mabille, Cédric ULg; Boulvain, Frédéric ULg

in Sedimentology (2009), 56

Bulk magnetic susceptibility measurements on sedimentological samples from all geological periods have been used widely in the last two decades for correlations and as a proxy for sea-level variations ... [more ▼]

Bulk magnetic susceptibility measurements on sedimentological samples from all geological periods have been used widely in the last two decades for correlations and as a proxy for sea-level variations. This paper explores the link between magnetic susceptibility, depositional setting and environmental parameters. These environmental parameters include distal–proximal transects, microfacies successions and fourth-order trends on different carbonate platform types (platform, ramp, carbonate mound or atoll) during different Devonian stages (Eifelian, Givetian and Frasnian). Average magnetic susceptibility values over a distal–proximal-trending facies succession vary markedly with depositional setting. On carbonate platforms, average magnetic susceptibility generally increases towards the top of shallowing-upward sequences. On a distal–proximal transect, average magnetic susceptibility is intermediate for the deepest facies, decreases for the reef belts and increases to a maximum in the back-reef zone. In ramps and atolls, magnetic susceptibility trends clearly differ; average magnetic susceptibility generally decreases towards the top of shallowing-upward sequences and is highest in the deepest facies. The strong relationship between magnetic susceptibility, facies and sequences implies a strong environmental influence. However, the different responses in the different latform types suggest that sea-level changes leading to variation in detrital input is not the only parameter controlling average magnetic susceptibility values. Other primary or secondary processes also probably influenced magnetic mineral distribution. Primary processes such as carbonate production and water agitation during deposition are probably key factors. When carbonate production is high, the proportion of magnetic minerals is diluted and the magnetic susceptibility signal decreases. High water agitation during deposition will also selectively remove magnetic minerals and will lead to low average magnetic susceptibility values. These parameters explain the lowest values observed on the reef platform, inner ramp and atoll crown, which are all in areas characterized by higher carbonate production and greater water agitation during deposition. The lowest values observed in the lagoon inside the atoll crown can be related to detrital isolation by the atoll crown. However, other parameters such as biogenic magnetite production or diagenesis can also influence the magnetic signal. Diagenesis can change magnetism by creating or destroying magnetic minerals. However, the influence of diagenesis probably is linked strongly to the primary facies (permeability, amount of clay or organic matter) and probably enhanced the primary signal. The complexity of the signal gives rise to correlation problems between different depositional settings. Thus, while magnetic susceptibility has the potential to be an important correlation tool, the results of this investigation indicate that it cannot be used without consideration of sedimentary processes and depositional environments and without strongbiostratigraphical control. [less ▲]

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See detailInfluence of selected parameters on the flotation of Cu-Mo ore from Ellatzite deposit in Bulgaria
Gaydardzhiev, Stoyan ULg; Bouchat, Harold ULg; Dedelyanova, K et al

in Proceedings of the XXVI International Mineral Processing Congress (2012, September)

Laboratory batch tests having preliminary and orientation character aiming at improvement of the molybdenum flotation at Ellatzite copper processing plant in Bulgaria have been conducted. The following ... [more ▼]

Laboratory batch tests having preliminary and orientation character aiming at improvement of the molybdenum flotation at Ellatzite copper processing plant in Bulgaria have been conducted. The following technological parameters have been screened to study their influence on the grade and recovery of copper and molybdenum during the rougher flotation stage: flotation pulp density, pH, addition of secondary collector and replacement of MIBC by pine oil as a frother. The results have shown that slightly better grade/recovery figures could be obtained for both copper and molybdenum at lower flotation pulp densities. The addition of kerosene has improved the recovery of molybdenum however on the expense of that of copper. The effects from pH variation and the replacement of MIBC by pine oil as a frother have been almost negligible. [less ▲]

Detailed reference viewed: 88 (9 ULg)
See detailInfluence of selective mutations of a cold-adapted subtilisin on thermoresistance of this enzyme dried by spray-drying.
Bare, G.; Diakiese, A.; Zgoulli, S. et al

Poster (1997, August)

Detailed reference viewed: 17 (9 ULg)
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See detailInfluence of selenium enriched fertilizers on the selenium content in grass and the selenium status in a suckling herd offered selenium enriched grass, silage and barley
Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg; Coenen, M. et al

in Book of Abstracts of the 55th Annual Meeting of the European Association for Animal Production (2004)

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See detailInfluence of Several Peptidase Inhibitors on the Pro-Inflammatory Effects of Substance P, Capsaicin and Collagenase
Damas, Jacques ULg; Bourdon, V.; Liégeois, Jean-François ULg et al

in Naunyn-Schmiedeberg's Archives of Pharmacology (1996), 354(5), 662-9

Injection of substance P (SP) in a rat hindpaw induced extravasation of 125I-labelled albumin in both hindpaws and salivation. Intravenous injection of SP dose-dependently increased vascular permeability ... [more ▼]

Injection of substance P (SP) in a rat hindpaw induced extravasation of 125I-labelled albumin in both hindpaws and salivation. Intravenous injection of SP dose-dependently increased vascular permeability. This latter effect was increased in rat paws by captopril, an inhibitor of angiotensin-converting enzyme (ACE), administered locally in combination with diprotin A, an inhibitor of an dipeptidyl(amino)peptidase IV (DAP IV) or phosphoramidon, an inhibitor of neutral endopeptidase (NEP). The increase in permeability induced by SP was inhibited by RP 67580, a NK-1-receptor antagonist. Intravenous injection of capsaicin induced labelled albumin extravasation in rat paws. This effect was increased by combination of captopril with diprotin A or phosphoramidon, but not by captopril associated with amastatin, an inhibitor of aminopeptidase M (AmM). It was suppressed by RP 67580. Injection of collagenase in rat paws triggered a swelling and a local plasma exudation. These responses were reduced by RP 67580 but not by RP 68651, its inactive enantiomer. They were increased by combination of captopril with diprotin A or phosphoramidon in normal rats. The potentiating effects of captopril and diprotin A were suppressed by RP 67580 in normal rats but did not develop in kininogen-deficient rats. The oedema induced by collagenase was also increased by lisinopril, another ACE inhibitor, administered locally in combination with apstatin, an inhibitor of aminopeptidase P (AmP). In rats pretreated by methysergide, collagenase-induced oedema was reduced and can be increased by captopril, by lisinopril, administered alone or by lisinopril associated with apstatin. It is concluded that SP is mainly inactivated in rat paws by ACE, DAP IV and NEP. In collagenase-induced oedema, a low amount of SP would be released from afferent nerve terminals by bradykinin formed in low amounts. Bradykinin is inactivated in rat paws by ACE and AmP. In collagenase-oedema, the pro-inflammatory effects of bradykinin are concealed by the effects of the other mediators. [less ▲]

Detailed reference viewed: 9 (1 ULg)