Publications ORBi OA
Bookmark and Share    
Full Text
See detailUn imagier pour sourds au début du XVIIIe siècle ? le manuscrit 2284 de l'Université de Liège
Donneau, Olivier ULg

in Culture, le magazine culturel de l'Université de Liège (2009)

Parmi les manuscrits de la Bibliothèque générale de Philosophie et Lettres se trouve un curieux petit carnet doté d'une reliure de cuir portant les armes de Courtrai. Il contient un imagier ... [more ▼]

Parmi les manuscrits de la Bibliothèque générale de Philosophie et Lettres se trouve un curieux petit carnet doté d'une reliure de cuir portant les armes de Courtrai. Il contient un imagier vraisemblablement destiné à la communication entre sourds et entendants. Ce carnet est un témoignage exceptionnel sur la surdité sous l'Ancien Régime. [less ▲]

Detailed reference viewed: 116 (21 ULg)
Full Text
Peer Reviewed
See detailLa copropriété d'immeubles ou de groupe d'immeubles bâtis : un tour d'horizon de la réforme
Salvé, Arianne ULg

in Tijdschrift voor Appartements- en Immorecht = Revue Copropriété et Droit Immobilier (2009), (4), 8-16

La Chambre des représentants a donné son feu vert à la modification des dispositions légales relatives à la copropriété (d’immeubles ou de groupes d’immeubles bâtis). La Commission Justice de la Chambre a ... [more ▼]

La Chambre des représentants a donné son feu vert à la modification des dispositions légales relatives à la copropriété (d’immeubles ou de groupes d’immeubles bâtis). La Commission Justice de la Chambre a eu à cœur de simplifier et d’accroître la transparence dans la gestion des copropriétés par rapport au prescrit légal de la loi du 30 juin 1994. Entre-temps, le Sénat a utilisé son droit d’évocation du projet de loi voté à la Chambre. Un sommaire du projet de réforme. (Lge 25/11/2009) [less ▲]

Detailed reference viewed: 103 (25 ULg)
Full Text
Peer Reviewed
See detailThe role of European national journals in education
Lancellotti, Patrizio ULg

in Heart (2009), 95(24), 3

Detailed reference viewed: 15 (1 ULg)
Full Text
See detailAimms - Tutoriel en une heure à l’usage des débutants
Bay, Maud ULg; François, Véronique ULg

Learning material (2009)

Detailed reference viewed: 201 (16 ULg)
Full Text
Peer Reviewed
See detailLepton Flavor Equilibration and Leptogenesis
Aristizabal Sierra, Diego ULg; Losada, Marta; Enrico, Nardi

in Journal of Cosmology and Astroparticle Physics (2009), 0912

We study the role played in leptogenesis by the equilibration of lepton flavors, as could be induced in supersymmetric models by off diagonal soft breaking masses for the scalar lepton doublets mαβ, or ... [more ▼]

We study the role played in leptogenesis by the equilibration of lepton flavors, as could be induced in supersymmetric models by off diagonal soft breaking masses for the scalar lepton doublets mαβ, or more generically by new sources of lepton flavor violation. We show that if mαβ>1GeV and leptogenesis occurs below ~100TeV, dynamical flavor effects are irrelevant and leptogenesis is correctly described by a one-flavor Boltzmann equation. We also discuss spectator effects in low scale leptogenesis by taking into account various chemical equilibrium conditions enforced by the reactions that are in thermal equilibrium. We write down the Boltzmann equation for low scale supersymmetric leptogenesis that includes flavor and spectator effects in the presence of lepton flavor equilibration, and we show how it reduces to a particularly simple form. [less ▲]

Detailed reference viewed: 9 (1 ULg)
Full Text
Peer Reviewed
See detailProsopographie des médecins de l’Asie Mineure pendant l’Antiquité classique, I. Catalogue des médecins
Nissen, Cécile ULg

E-print/Working paper (2009)

Identifier tous les médecins grecs et romains ayant été en contact avec l’Asie Mineure pendant l’Antiquité classique, soit entre le Ve s. av. J.-C. et le Ve s. ap. J. C., tel était l’objectif premier de ... [more ▼]

Identifier tous les médecins grecs et romains ayant été en contact avec l’Asie Mineure pendant l’Antiquité classique, soit entre le Ve s. av. J.-C. et le Ve s. ap. J. C., tel était l’objectif premier de ce travail, objet d’une thèse de doctorat soutenue à l’EPHE de Paris, en décembre 2006. Il a donc fallu procéder à un inventaire des médecins originaires de l’Asie Mineure, mais aussi actifs et/ou formés dans cette région. Afin de garantir l’exhaustivité du catalogue, l’ensemble des sources disponibles ont été dépouillées, qu’elles soient littéraires, papyrologiques, épigraphiques ou numismatiques. Cette étude pluridisciplinaire a permis d’élaborer un corpus de trois cent trente-trois unités, organisé selon un double critère géographique : les médecins sont classés en fonction d’abord des régions (Bithynie, Paphlagonie, Pont, Troade, Mysie, Éolide, Lydie, Ionie, Carie, Lycie, Pamphylie, Cilicie, Phrygie, Pisidie, Galatie, Lycaonie, Isaurie et Cappadoce), puis des villes de l’Asie Mineure avec lesquelles ils étaient en relation. S’y ajoute un dernier chapitre reprenant vingt-sept cas douteux quant à leur profession médicale ou à leur ancrage micrasiatique. Chaque médecin est présenté dans un tableau individuel rassemblant toutes les informations possédées à son sujet, à savoir nom, date, parcours professionnel, sources antiques, qualification professionnelle, ouvrages médicaux, commentaire et bibliographie. Les documents ainsi rassemblés constituent le catalogue exhaustif des médecins ayant été en contact avec l’Asie Mineure durant l’Antiquité gréco-romaine. Un tel catalogue, inexistant à ce jour pour le territoire micrasiatique, apparaît d’abord comme un instrument de travail, mis à la disposition de tous les chercheurs intéressés par l’histoire de la médecine antique. En outre, ce recueil fournit les matériaux nécessaires à l’établissement de la prosopographie proprement dite. L’exploitation des données du présent corpus est, en effet, indispensable à l’aboutissement de l’enquête prosopographique entreprise. Actuellement en cours, l’analyse et l’interprétation des données du catalogue feront l’objet d’une publication complémentaire sous une forme « papier » traditionnelle. Les questions liées à la répartition géographique et chronologique des médecins, à leurs qualifications et à leurs statuts professionnels, mais aussi à leur formation, à leurs rapports avec certains cultes, notamment guérisseurs, ou encore à l’onomastique, seront étudiées dans ces conclusions. [less ▲]

Detailed reference viewed: 247 (14 ULg)
Full Text
Peer Reviewed
See detailAn alien in the heart: giant infective endocarditis.
Bataille, Yoann ULg; Moonen, Marie ULg; Lancellotti, Patrizio ULg

in Acta Cardiologica (2009), 64(6), 807-9

Detailed reference viewed: 31 (2 ULg)
Full Text
Peer Reviewed
See detailSynchronization with partial state feedback on SO(n),
Lageman, Christian; Sarlette, Alain ULg; Sepulchre, Rodolphe ULg

in Proceedings of the 48th IEEE Conference on Decision and Control (2009, December)

This paper considers the problem of constructing a distributed feedback law to achieve synchronization for a group of k agents whose states evolve on SO(n) and which exchange only partial state ... [more ▼]

This paper considers the problem of constructing a distributed feedback law to achieve synchronization for a group of k agents whose states evolve on SO(n) and which exchange only partial state information along communication links. The partial state information is given by the action of the state on reference vectors in Rn. We propose a gradient based control law which achieves exponential local convergence to a synchronization configuration under a rank condition on a generalized Laplacian matrix. Furthermore, we discuss the case of time-varying reference vectors and provide a convergence result for this case. The latter helps reach synchronization, requiring less communication links and weaker conditions on the instantaneous reference vectors. Our methods are illustrated on an attitude synchronization problem where agents exchange only their relative positions observed in the respective body frames. [less ▲]

Detailed reference viewed: 35 (6 ULg)
Full Text
See detailLe coût d’opportunité du capital pour l’entrepreneur revisité
Hübner, Georges ULg

in Corhay, Albert; Hübner, Georges; Muller, Aline (Eds.) Finance et Valeur(s) (2009)

Detailed reference viewed: 81 (7 ULg)
Full Text
Peer Reviewed
See detailDes reconversions professionnelles positives: le retour des femmes sur le marché de l'emploi
Dieu, Anne-Marie ULg; delhaye, Christine

in Cahiers de l'Éducation Permanente (Les) (2009), 181

Detailed reference viewed: 82 (10 ULg)
Full Text
Peer Reviewed
See detailConsensus on homogeneous manifolds
Sarlette, Alain ULg; Sepulchre, Rodolphe ULg

in Proceedings of the 48th IEEE Conference on Decision and Control (2009, December)

The present paper considers distributed consensus algorithms for agents evolving on a connected compact homogeneous (CCH) manifold. The agents track no external reference and communicate their relative ... [more ▼]

The present paper considers distributed consensus algorithms for agents evolving on a connected compact homogeneous (CCH) manifold. The agents track no external reference and communicate their relative state according to an interconnection graph. The paper first formalizes the consensus problem for synchronization (i.e. maximizing the consensus) and balancing (i.e. minimizing the consensus); it thereby introduces the induced arithmetic mean, an easily computable mean position on CCH manifolds. Then it proposes and analyzes various consensus algorithms on manifolds: natural gradient algorithms which reach local consensus equilibria; an adaptation using auxiliary variables for almost-global synchronization or balancing; and a stochastic gossip setting for global synchronization. It closes by investigating the dependence of synchronization properties on the attraction function between interacting agents on the circle. The theory is also illustrated on SO(n) and on the Grassmann manifolds. [less ▲]

Detailed reference viewed: 42 (7 ULg)
Full Text
Peer Reviewed
See detailQuasar induced galaxy formation: a new paradigm?
Elbaz, David; Jahnke, Knud; Pantin, eric et al

in Astronomy and Astrophysics (2009), 507

Aims: We discuss observational evidence that quasars play a key role in the formation of galaxies, starting from the detailed study of the quasar HE0450-2958 and extending the discussion to a series of ... [more ▼]

Aims: We discuss observational evidence that quasars play a key role in the formation of galaxies, starting from the detailed study of the quasar HE0450-2958 and extending the discussion to a series of converging evidence that radio jets may trigger galaxy formation. Methods: We use mid infrared imaging with VISIR at the ESO-VLT to model the mid to far infrared energy distribution of the system and the stellar population of the companion galaxy using optical VLT-FORS spectroscopy. The results are combined with optical, CO, radio continuum imaging from ancillary data. Results: The direct detection with VISIR of the 7 kpc distant companion galaxy of HE0450-2958 allows us to spatially separate the sites of quasar and star formation activity in this composite system made of two ultra-luminous infrared galaxies (ULIRGs), where the quasar generates the bulk of the mid infrared light and the companion galaxy powered by star formation dominates in the far infrared. No host galaxy has yet been detected for this quasar, but the companion galaxy stellar mass would bring HE0450-2958 in the local MBH - Mstar-bulge relation if it were to merge with the QSO. This is bound to happen because of their close distance (7 kpc) and low relative velocity ( 60-200 km s-1). We conclude that we may be witnessing the building of the MBH - Mstar-bulge relation, or at least of a major event in that process. The star formation rate ( 340 Mȯ yr-1), age (40-200 Myr) and stellar mass ( [5-6]×10^10 Mȯ) are consistent with jet-induced formation of the companion galaxy. We suggest that HE0450-2958 may be fueled by fresh material from cold gas accretion from intergalactic filaments. We map the projected galaxy density surrounding the QSO as a potential tracer of intergalactic filaments and discuss a putative detection. Comparison to other systems suggest that an inside-out formation of quasar host galaxies and jet-induced galaxy formation may be a common process. Two tests are proposed for this new paradigm: (1) the detection of offset molecular gas or dust emission with respect to the position of distant QSOs; (2) the delayed formation of host galaxies as a result of QSO activity, hence the two step building of the M_BH/Mstar-bulge ratio. [less ▲]

Detailed reference viewed: 50 (3 ULg)
Full Text
Peer Reviewed
See detailAn approach to retrieve information on the carbonyl fluoride (COF2) vertical distributions above Jungfraujoch by FTIR multi-spectrum multi-window fitting
Duchatelet, Pierre ULg; Mahieu, Emmanuel ULg; Ruhnke, Roland et al

in Atmospheric Chemistry and Physics (2009), 9

We present an original multi-spectrum fitting procedure to retrieve volume mixing ratio (VMR) profiles of carbonyl fluoride (COF2) from ground-based high resolution Fourier transform infrared (FTIR) solar ... [more ▼]

We present an original multi-spectrum fitting procedure to retrieve volume mixing ratio (VMR) profiles of carbonyl fluoride (COF2) from ground-based high resolution Fourier transform infrared (FTIR) solar spectra. The multi-spectrum approach consists of simultaneously combining, during the retrievals, all spectra recorded consecutively during the same day and with the same resolution. Solar observations analyzed in this study with the SFIT-2 v3.91 fitting algorithm correspond to more than 2900 spectra recorded between January 2000 and December 2007 at high zenith angles, with a Fourier Transform Spectrometer operated at the high-altitude International Scientific Station of the Jungfraujoch (ISSJ, 46.5° N latitude, 8.0° E longitude, 3580 m altitude), Switzerland. The goal of the retrieval strategy described here is to provide information about the vertical distribution of carbonyl fluoride. The microwindows used are located in the ν4 or in the ν4 COF2 infrared (IR) absorption bands. Averaging kernel and eigenvector analysis indicates that our FTIR retrieval is sensitive to COF2 inversion between 17 and 30 km, with the major contribution to the retrieved information always coming from the measurement. Moreover, there was no significant bias between COF2 partial columns, total columns or VMR profiles retrieved from the two bands. For each wavenumber region, a complete error budget including all identified sources has been carefully established. In addition, comparisons of FTIR COF2 17–30 km partial columns with KASIMA and SLIMCAT 3-D CTMs are also presented. If we do not notice any significant bias between FTIR and SLIMCAT time series, KASIMA COF2 17–30 km partial columns are lower of around 25%, probably due to incorrect lower boundary conditions. For each times series, linear trend estimation for the 2000–2007 time period as well as a seasonal variation study are also performed and critically discussed. For FTIR and KASIMA time series, very low COF2 growth rates (0.4±0.2%/year and 0.3±0.2%/year, respectively) have been derived. However, the SLIMCAT data set gives a slight negative trend (−0.5±0.2%/year), probably ascribable to discontinuities in the meteorological data used by this model. We further demonstrate that all time series are able to reproduce the COF2 seasonal cycle, which main seasonal characteristics deduced from each data set agree quite well. [less ▲]

Detailed reference viewed: 86 (24 ULg)
Full Text
See detailCan we use exergy index and the microbenthic loop as indicators of perturbations in Posidonia oceanica (L.) Delile meadows?
Pete, Dorothée ULg; Lenartz, Fabian ULg; Velimirov, Branko et al

Poster (2009, November 27)

Nowadays, many anthropogenic perturbations threaten the Mediterranean Sea. Posidonia oceanica , its endemic phanerogam, is often used as a pollution descriptor. Unfortunately, it does not react very fast ... [more ▼]

Nowadays, many anthropogenic perturbations threaten the Mediterranean Sea. Posidonia oceanica , its endemic phanerogam, is often used as a pollution descriptor. Unfortunately, it does not react very fast because of its low turnover rate (i.e. 1.5y-1). To solve that problem, this project proposes to use the microbenthic loop (meiofauna, bacteria, microphytobenthos and organic matter) of this important coastal ecosystem to detect anthropogenic pollutions earlier, because its components may react more rapidly than the posidonia plant. Every components of the loop are investigated and characterized, in order to determine their reactions to perturbations and use them in the calculation of the exergy index. This index comes from the thermodynamic theory of ecosystems and expresses the distance of an ecosystem, at a given state, from its equilibrium. The higher this index, the closer from its optimum state (climax) the ecosystem is. To calculate it, the biomass of each part of the studied ecosystem, weighted by a factor called β, is needed. This factor is estimated on a genetic basis and given in Jørgensen et al. (2005). The final aim of this project is to show if the exergy index can be used in the Mediterranean Sea as a tool in monitoring strategies, specifically in the sedimentary compartment of P. oceanica meadows. To realise these goals, a reference meadow was chosen near the research station STARESO (STAtion de REcherches Sous-marines et Oceanographiques) in Calvi Bay (Corsica, France). This meadow is studied since the 80’s and its good state of health is proven. Seasonal, spatial (small scale) and bathymetric variations in the microbenthic loop are studied there since 2007, by sediment cores (diameter=4.7cm, length=10cm). Those results are compared for 2008 with the patterns observed in a supposed perturbed site, situated close to a fish farm, in Calvi Bay too. In situ experiments were also led in summer 2009. During three months, a shading experiment and an enrichment of the sediment with sediment coming from under the aquaculture (once a week) were performed. Those experiments aimed to understand reactions of the microbenthic loop to those kinds of perturbations, that are often occurring close to a fish farm. Up to now, that study has led to a better understanding of seasonal and bathymetric patterns in the microbenthic loop of P. oceanica. The most important result obtained is the existence of an important spatial heterogeneity at small scale in that ecosystem. This phenomenon must absolutely be taken into account in every study based on the sediment in P. oceanica meadows. [less ▲]

Detailed reference viewed: 59 (4 ULg)
Full Text
Peer Reviewed
See detailVariations in sound production in <i>Dascyllus flavicaudus<i>
Kever, Loïc ULg; Lecchini, David; Parmentier, Eric ULg

Poster (2009, November 27)

Detailed reference viewed: 16 (3 ULg)
Full Text
See detailMultidisciplinary study of the trophic diversity and functional role of amphipod crustaceans associated to Posidonia oceanica meadows
Michel, Loïc ULg; Lepoint, Gilles ULg; Gobert, Sylvie ULg et al

Poster (2009, November 27)

Posidonia oceanica is a seagrass endemic to the Mediterranean Sea, and is able to form large monospecific areas, called meadows. These meadows are critical features of the Mediterranean coastal zones, and ... [more ▼]

Posidonia oceanica is a seagrass endemic to the Mediterranean Sea, and is able to form large monospecific areas, called meadows. These meadows are critical features of the Mediterranean coastal zones, and are of great ecologic and economic importance. Posidonia oceanica meadows shelter high biomasses and biodiversities of amphipod crustaceans. In other temperate meadows, such as Atlantic Zostera marina meadows, the amphipods play an important part in the functioning of the ecosystem, notably in organic matter transfers from producers to higher level consumers. However, the situation in Posidonia oceanica meadows remains unclear, due to the lack of precise studies, and little is known about the trophic ecology of amphipods. In this context, our research is structured in three main tasks. We chose the Calvi Bay (NW Corsica, France) as a study site, and sampling is undertaken from the STARESO research station (University of Liège, Belgium). First, we study the exact composition of the amphipod community, as well as its temporal variation at diel and seasonal scale. This task is based on in situ collection of samples using three methods: the hand-towed net, litter collection and light traps. Completion of this task will allow us to have accurate and reliable data, taken on our study site, concerning the abundance and specific diversity of amphipods associated with P. oceanica meadows. The second task is a reconstruction of the diet of the studied animals. Indeed, amphipods from P. oceanica meadows are usually regarded as vegetal epiphytes grazers, or generalist detritivores, but few studies focus on the interspecific trophy diversity, or on the importance of alternative food sources. Our approach relies on in situ sampling of amphipods and potential food items. The techniques used combine traditional methods (gut content observation) and use of trophic markers, such as measurements of C and N stable isotope rations and fatty acid composition analysis. Finally, we use in vitro and in situ microcosms experiments to evaluate the impact of amphipod feeding activity on the ecosystem functioning, and more precisely on the dynamics of the epiphyte cover. By quantifying this interaction, our purpose is to put back the results obtained in the first two parts into a wider context, the functioning of the Posidonia oceanica meadow as an ecosystem. Thus, by combining in situ sampling and in vitro experimentation, and by combining traditional and innovating techniques, we hope, at the end of this research, to enhance the knowledge of the trophic diversity and the functional role of amphipod crustaceans associated with Mediterranean Posidonia meadows. [less ▲]

Detailed reference viewed: 96 (29 ULg)
Full Text
Peer Reviewed
See detailTechnical Note: Harmonized retrieval of column-integrated atmospheric water vapor from the FTIR network - First examples for long-term records and station trends
Sussmann, R.; Borsdorff, T.; Rettinger, M. et al

in Atmospheric Chemistry and Physics (2009), 9(22), 8987-8999

We present a method for harmonized retrieval of integrated water vapor (IWV) from existing, long-term, measurement records at the ground-based mid-infrared solar FTIR spectrometry stations of the Network ... [more ▼]

We present a method for harmonized retrieval of integrated water vapor (IWV) from existing, long-term, measurement records at the ground-based mid-infrared solar FTIR spectrometry stations of the Network for the Detection of Atmospheric Composition Change (NDACC). Correlation of IWV from FTIR with radiosondes shows an ideal slope of 1.00(3). This optimum matching is achieved via tuning one FTIR retrieval parameter, i.e., the strength of a Tikhonov regularization constraining the derivative (with respect to height) of retrieved water profiles given in per cent difference relative to an a priori profile. All other FTIR-sonde correlation parameters (intercept = 0.02(12) mm, bias = 0.02(5) mm, standard deviation of coincident IWV differences (stdv) = 0.27 mm, R = 0.99) are comparable to or better than results for all other ground-based IWV sounding techniques given in the literature. An FTIR-FTIR side-by-side intercomparison reveals a strong exponential increase in stdv as a function of increasing temporal mismatch starting at Δt ≈ 1 minute. This is due to atmospheric water vapor variability. Based on this result we derive an upper limit for the precision of the FTIR IWV retrieval for the smallest Δt (= 3.75 min) still giving a statistically sufficient sample (32 coincidences), i.e., precision (IWVFTIR) < 0.05 mm (or 2.2 % of the mean IWV). The bias of the IWV retrievals from the two different FTIR instruments is nearly negligible (0.02(1) mm). The optimized FTIR IWV retrieval is set up in the standard NDACC algorithm SFIT 2 without changes to the code. A concept for harmonized transfer of the retrieval between different stations deals with all relevant control parameters; it includes correction for differing spectral point spacings (via regularization strength), and final quality selection of the retrievals (excluding the highest residuals (measurement minus model), 5% of the total). As first application examples long-term IWV data sets are retrieved from the FTIR records of the Zugspitze (47.4 °N, 11.0 °E, 2964 m a.s.l.) and Jungfraujoch (46.5 °N, 8.0 °E, 3580 m a.s.l.) NDACC sites. Station-trend analysis comprises a linear fit after subtracting an intra-annual model (3 Fourier components) and constructing an uncertainty interval [95 % confidence] via bootstrap resampling. For the Zugspitze a significant trend of 0.79 [0.65, 0.92] mm/decade is found for the time interval [1996 - 2008], whereas for the Jungfraujoch no significant trend is found. This confirms recent findings that strong variations of IWV trends do occur above land on the local to regional scale (≈250 km) in spite of homogeneous surface temperature trends. This paper provides a basis for future exploitation of more than a dozen existing, multi-decadal FTIR measurement records around the globe for climate studies. [less ▲]

Detailed reference viewed: 59 (14 ULg)
Full Text
See detailModéliser l’ionosphère pour les utilisateurs Galileo simple fréquence
Bidaine, Benoît ULg

Learning material (2009)

Detailed reference viewed: 50 (16 ULg)
Full Text
Peer Reviewed
See detailBacillus amyloliquefaciens GA1 as a source of potent antibiotics and other secondary metabolites for biocontrol of plant pathogens.
Arguelles Arias, Anthony ULg; Ongena, Marc ULg; Halimi, Badre et al

in Microbial Cell Factories (2009), 8(1), 63

Phytopathogenic fungi affecting crop and post-harvested vegetables are a amajor threat to food production and food storage. To face these drawbacks, producers have become increasingly dependent on ... [more ▼]

Phytopathogenic fungi affecting crop and post-harvested vegetables are a amajor threat to food production and food storage. To face these drawbacks, producers have become increasingly dependent on agrochemicals. However, intensive use of these compounds has led to the emergence of pathogen resistance and severe negative environmental impacts. There are also a number of plant diseases for which chemical solutions are ineffective or non-existent as well as an increasing demand by consumers for pesticide-free food. Thus, biological control through the use of natural antagonistic microorganisms has emerged as a promising alternative to chemical pesticides for more rational and safe crop management. RESULTS: The genome of the plant-associated B. amyloliquefaciens GA1 was sample sequenced. Several gene clusters involved in the synthesis of biocontrol agents were detected. Four gene clusters were shown to direct the synthesis of the cyclic lipopeptides surfactin, iturin A and fengycin as well as the iron-siderophore bacillibactin. Beside these non-ribosomaly synthetised peptides, three additional gene clusters directing the synthesis of the antibacterial polyketides macrolactin, bacillaene and difficidin were identified. Mass spectrometry analysis of culture supernatants led to the identification of these secondary metabolites, hence demonstrating that the corresponding biosynthetic gene clusters are functional in strain GA1. In addition, genes encoding enzymes involved in synthesis and export of the dipeptide antibiotic bacilysin were highlighted. However, only its chlorinated derivative, chlorotetaine, could be detected in culture supernatants. On the contrary, genes involved in ribosome-dependent synthesis of bacteriocin and other antibiotic peptides were not detected as compared to the reference strain B. amyloliquefaciens FZB42. CONCLUSION: The production of all of these antibiotic compounds highlights B. amyloliquefaciens GA1 as a good candidate for the development of biocontrol agents. [less ▲]

Detailed reference viewed: 181 (52 ULg)