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See detailThe Pseudomonas aeruginosa pirA gene encodes a second receptor for ferrienterobactin and synthetic catecholate analogues.
Ghysels, Bart ULg; Ochsner, Urs; Mollman, Ute et al

in FEMS microbiology letters (2005), 246(2), 167-74

Actively secreted iron chelating agents termed siderophores play an important role in the virulence and rhizosphere competence of fluorescent pseudomonads, including Pseudomonas aeruginosa which secretes ... [more ▼]

Actively secreted iron chelating agents termed siderophores play an important role in the virulence and rhizosphere competence of fluorescent pseudomonads, including Pseudomonas aeruginosa which secretes a high affinity siderophore, pyoverdine, and the low affinity siderophore, pyochelin. Uptake of the iron-siderophore complexes is an active process that requires specific outer membrane located receptors, which are dependent of the inner membrane-associated protein TonB and two other inner membrane proteins, ExbB and ExbC. P. aeruginosa is also capable of using a remarkable variety of heterologous siderophores as sources of iron, apparently by expressing their cognate receptors. Illustrative of this feature are the 32 (of which 28 putative) siderophore receptor genes observed in the P. aeruginosa PAO1 genome. However, except for a few (pyoverdine, pyochelin, enterobactin), the vast majority of P. aeruginosa siderophore receptor genes still remain to be characterized. Ten synthetic iron chelators of catecholate type stimulated growth of a pyoverdine/pyochelin deficient P. aeruginosa PAO1 mutant under condition of severe iron limitation. Null mutants of the 32 putative TonB-dependent siderophore receptor encoding genes engineered in the same genetic background were screened for obvious deficiencies in uptake of the synthetic siderophores, but none showed decreased growth stimulation in the presence of the different siderophores. However, a double knock-out mutant of ferrienterobactin receptor encoding gene pfeA (PA 2688) and pirA (PA0931) failed to be stimulated by 4 of the tested synthetic catecholate siderophores whose chemical structures resemble enterobactin. Ferric-enterobactin also failed to stimulate growth of the double pfeA-pirA mutant although, like its synthetic analogues, it stimulated growth of the corresponding single mutants. Hence, we confirmed that pirA represents a second P. aeruginosa ferric-enterobactin receptor. The example of these two enterobactin receptors probably illustrates a more general phenomenon of siderophore receptor redundancy in P. aeruginosa. [less ▲]

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See detailPseudomonas pickettii: nosocomial outbreak of bacteremia
MELIN, Pierrette ULg

Conference (1996, March)

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See detailPseudorange
Warnant, René ULg; Louis, Luc

Report (1989)

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See detailPseudoscalar vertex and quark masses
Cudell, Jean-René ULg; Le Yaouanc, Alain; Pittori, Carlotta

in Nuclear Physics B Proceedings Supplement (2000), 83

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See detailPseudoscalar vertex, Goldstone boson and quark masses on the lattice
Cudell, Jean-René ULg; Le Yaouanc, A.; Pittori, Carlotta

in Physics Letters B (1999), 454

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See detailLe pseudoxanthome élatique au-delà de la peau, de l'oeil et des vaisseaux.
Blaise, Géraldine ULg; Franchimont, Claudine ULg; Pierard, Gérald ULg

in Revue Médicale de Liège (2009), 64

The main clinical manifestations of pseudoxanthoma elasticum (PXE) alter small arteries, the eyes and the skin. At the microanatomical level, the feature in common is an alteration of the elastic fibres ... [more ▼]

The main clinical manifestations of pseudoxanthoma elasticum (PXE) alter small arteries, the eyes and the skin. At the microanatomical level, the feature in common is an alteration of the elastic fibres that appear dystrophic and in part calcified. The disease is genetically transmitted as an autosomal recessive trait. The gene coding for the MRP6 protein is often mutated. Thus PXE appears as a metabolic disease conveyed by serum. [less ▲]

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See detailPSF modeling of the XMM flight mirror modules
Stockman, Yvan ULg; Houbrechts, Yvette ULg; Nazé, Yaël ULg et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (1999, October 01)

In the frame of XMM testing, all the mirror modules have been illuminated by a vertical EUV collimated beam a the Centre Spatial de Liege. A mirror module consists in 58 co- focal and co-axial Wolter I ... [more ▼]

In the frame of XMM testing, all the mirror modules have been illuminated by a vertical EUV collimated beam a the Centre Spatial de Liege. A mirror module consists in 58 co- focal and co-axial Wolter I mirrors. Up to now the images obtained at CSL have been used to assess the Mirror Module optical performances in a flight representative configuration, and also to verify the impact of the thermal environmental and vibration test on the optical performance. Due to the highly complex design of the Mirror Modules, simulating XMM images in details is very difficult. The Point Spread Function of some of the mirror modules presents slight asymmetry. In the facility design study, it has been demonstrated that the diffraction impact at 58.4 nm is negligible with respect to the half energy width mirror module specification. Presently all the mirror modules are better than 165 arcsec. This paper presents first the diffraction contribution on the image. In a second step a point spread function is built by using the metrological mirror shell data. EUV images are then analyzed to evaluate the impact of the mirror interface structure integration process on the PSF. An analytical model of the measured EUV pSF is developed. The modelization technique is applied to simulate in-orbit image. Finally the different modelizations are evaluated and compared. [less ▲]

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See detailPSI Mehler reaction is the main alternative photosynthetic electron pathway in Symbiodinium sp., symbiotic dinoflagellates of cnidarians
Roberty, Stéphane ULg; Bailleul, Benjamin ULg; Berne, Nicolas et al

in New Phytologist (2014), 204(1), 81-91

• Photosynthetic organisms have evolved various photoprotective and regulatory mechanisms to cope with changing and high light intensities. The nature and relative amplitude of these mechanisms is matter ... [more ▼]

• Photosynthetic organisms have evolved various photoprotective and regulatory mechanisms to cope with changing and high light intensities. The nature and relative amplitude of these mechanisms is matter of debate in dinoflagellates that live in symbiosis with cnidarians. In this work, the amplitude of photosynthetic alternative electron flows to oxygen (chlororespiration, Mehler reaction, mitochondrial respiration) and PSI cyclic electron flow were investigated in Symbiodinium clades A1, B1 and F1. • Cultured Symbiodinium strains were maintained semi-continuously under identical environmental conditions. Joint measurements of oxygen evolution, fluorescence emission, and absorption changes at specific wavelengths were used to evaluate PSI and PSII electron transfer rates (ETR). • A light-dependent and O2-dependent ETR was observed in all strains. This ETR involved PSII and PSI and was insensitive to addition of mitochondrial and carbon fixation inhibitors. • These results demonstrate that photoreduction of oxygen downstream of PSI by the so-called Mehler reaction is the main alternative electron sink at the onset and steady state of photosynthesis in all strains. This mechanism in Symbiodinium sustains significant levels of photosynthetic electron flux under high light, thus acting as a photoprotective mechanism and increasing the ATP/NADPH ratio by the electron transfer chain. [less ▲]

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See detailPsicologia da delinquência
Born, Michel ULg

Book published by Climepsi Editores (2005)

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See detailPsicologia de la educacion
Crahay, Marcel ULg

Book published by Bello (2002)

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See detailPsicologos para qué ?
Richelle, Marc ULg

Book published by Sigueme (1973)

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See detailPsicopedagogia
Crahay, Marcel ULg

Book published by La Scuola (2000)

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See detailPsicosomatica da un punto di vista di un psichiatra infantile
Gauthier, Jean-Marie ULg

Conference (2013, May 11)

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See detailPSL : an ontology based language for the representation of multi-lingual urban permitting systems
Teller, Jacques ULg; Cutting-Decelle; Bourey et al

in Proceedings of World Conference on Accelerating Excellence in The Built Environment (WCAEBE) (2006)

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