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See detailControl of floral transition in maize
Van Kerkhoven, Fabrizio ULg; D'Aloia, Maria ULg; Périlleux, Claire ULg

Conference (2008, September)

Flowering time in plants is controlled by a number of environmental factors, among which photoperiod plays a key role. Maize ancestors are short-day (SD) plants, but breeding programs have selected ... [more ▼]

Flowering time in plants is controlled by a number of environmental factors, among which photoperiod plays a key role. Maize ancestors are short-day (SD) plants, but breeding programs have selected genotypes whose flowering is largely autonomous and occurs after production of a constant number of leaves regardless of photoperiod. Only few flowering time genes have been identified in maize; one of them is INDETERMINATE1 (ID1), cloned from a late-flowering mutant and encoding a zinc finger transcription factor. By contrast, the genetical control of flowering by photoperiod is best understood in the long-day (LD) dicot Arabidopsis and the SD monocot rice. A key regulator is the CONSTANS gene that mediates between the circadian clock – the time-keeper of the plant – and the synthesis of flowering signals. Here we report the analysis of a CONSTANS homolog in maize, ZmCO, in SD and in LD, and in different parts of the plant. Expression of ZmCO was found to be rhythmic and to be much higher in young leaf primordia than in mature leaf blades. Striking coincidence was observed with expression of ID1. [less ▲]

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See detailControl of floral transition in maize
Van Kerkhoven, Fabrizio ULg; Jennès, Nicolas; Périlleux, Claire ULg

in Comparative Biochemistry & Physiology Part A : Molecular & Integrative Physiology (2006), 143(4), 170

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See detailThe control of flowering: do genetical and physiological approaches converge ?
Périlleux, Claire ULg; Bernier, Georges ULg

in O'Neill, S. D.; Roberts, J. A. (Eds.) Plant Reproduction (2002)

Since the early 1990s, Arabidopsis thaliana has been studied as the species of choice of 'flowering geneticists'. Several pathways that either repress or promote flowering have been identified on the ... [more ▼]

Since the early 1990s, Arabidopsis thaliana has been studied as the species of choice of 'flowering geneticists'. Several pathways that either repress or promote flowering have been identified on the basis of (1) the flowering response of different genotypes to environmental factors (vernalization and photoperiod), (2) epistasis analyses, and (3) expression patterns of cloned genes in various backgrounds. Models attempting to include all information have been proposed repeatedly and their complexity is increasing with the bulk of data. In this review, we shall attempt to integrate into this genetical framework the physiological knowledge accumulated on a variety of plants by generations of researchers before the amost overnight breakthrough of Arabidopsis. [less ▲]

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See detailControl of hydrogen photoproduction by the proton gradient generated by cyclic electron flow in Chlamydomonas reinhardtii.
Tolleter, Dimitri; Ghysels, Bart ULg; Alric, Jean et al

in Plant Cell (2011), 23(7), 2619-30

Hydrogen photoproduction by eukaryotic microalgae results from a connection between the photosynthetic electron transport chain and a plastidial hydrogenase. Algal H(2) production is a transitory ... [more ▼]

Hydrogen photoproduction by eukaryotic microalgae results from a connection between the photosynthetic electron transport chain and a plastidial hydrogenase. Algal H(2) production is a transitory phenomenon under most natural conditions, often viewed as a safety valve protecting the photosynthetic electron transport chain from overreduction. From the colony screening of an insertion mutant library of the unicellular green alga Chlamydomonas reinhardtii based on the analysis of dark-light chlorophyll fluorescence transients, we isolated a mutant impaired in cyclic electron flow around photosystem I (CEF) due to a defect in the Proton Gradient Regulation Like1 (PGRL1) protein. Under aerobiosis, nonphotochemical quenching of fluorescence (NPQ) is strongly decreased in pgrl1. Under anaerobiosis, H(2) photoproduction is strongly enhanced in the pgrl1 mutant, both during short-term and long-term measurements (in conditions of sulfur deprivation). Based on the light dependence of NPQ and hydrogen production, as well as on the enhanced hydrogen production observed in the wild-type strain in the presence of the uncoupling agent carbonyl cyanide p-trifluoromethoxyphenylhydrazone, we conclude that the proton gradient generated by CEF provokes a strong inhibition of electron supply to the hydrogenase in the wild-type strain, which is released in the pgrl1 mutant. Regulation of the trans-thylakoidal proton gradient by monitoring pgrl1 expression opens new perspectives toward reprogramming the cellular metabolism of microalgae for enhanced H(2) production. [less ▲]

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See detailControl of hypertension in a kidney transplanted population : the EPARA study
Gellner, Karen; Saint-Remy, Annie ULg; Weekers, Laurent ULg et al

in Acta Clinica Belgica (2010, November 27), 66(1), 79

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See detailControl of hypertension in a kidney transplanted population : the EPARA study”.
Gellner, Karen ULg; Saint-Remy, Annie ULg; Weekers, Laurent ULg et al

Scientific conference (2010, November 27)

The prevalence of hypertension in this specific KT population remains high in spite of different antiHTA drugs use and the well known deleterious effect of HTA on kidney function and cardiovascular risk ... [more ▼]

The prevalence of hypertension in this specific KT population remains high in spite of different antiHTA drugs use and the well known deleterious effect of HTA on kidney function and cardiovascular risk. Home BP (and/or ABPM) should thus be recommended to identify this situation and secondary to adapt the treatment. [less ▲]

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See detailControl of hypertension in renal transplantation : the EPARA study
Gellner, Karen; SAINT-REMY, Annie ULg; WEEKERS, Laurent ULg et al

Conference (2011, June 26)

Blood pressure (BP) is a cardiovascular but also kidney disease risk factor, especially in high risk populations such as kidney transplantated one (KT). Therefore it must be accurately measured. The aim ... [more ▼]

Blood pressure (BP) is a cardiovascular but also kidney disease risk factor, especially in high risk populations such as kidney transplantated one (KT). Therefore it must be accurately measured. The aim of the current study was to evaluate the quality of BP control in such a population followed at the CHU Liège. [less ▲]

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See detailControl of inflammation in experimental bovine pneumonic pasteurellosis
Bureau, Fabrice ULg; Van de Weerdt, M. L.; Hanon, E. et al

in Bovine Practitioner (1998), 31(1), 5-13

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See detailControl of key pecking by the duration of a visual stimulus
Perikel, J. J.; Richelle, Marc ULg; Maurissen, J.

in Journal of the Experimental Analysis of Behavior (1974), 22(1), 131-134

Pigeons' key peck were brought under the control of the duration of a visual stimulus in one-key and two-key procedures. In the one-key procedure, pecks were reinforeced after presentations of a long ... [more ▼]

Pigeons' key peck were brought under the control of the duration of a visual stimulus in one-key and two-key procedures. In the one-key procedure, pecks were reinforeced after presentations of a long-duration stimulus but not after presentations of a short-duration stimulus. In the two-key procedure, left-key pecks were reinforced after the long-duration stimulus and right-key pecks after the short-duration stimulus. In both procedures, the long-duration stimulus was 10 sec, and the short-duration stimulus was increased from 1 to 8 sec in1-sec steps. Discriminative control developed with both procedures, but with greater acuracy in the two-key procedures, in which a difference threshold was obtained at short-duration values between 7 and 8 sec, or about 2.5 sec shorter than the long-duration stimulus. [less ▲]

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See detailControl of listeria monocytogenes in dairy farms
Belleflamme, Christel ULg; Di Tanna, Sybille ULg; Anceau, Christine ULg et al

in Proceedings of the Ninth Conference on Food Microbiology (2004)

- Performed in Walloon farms in contact with the PDR project - L. monocytogenes characterised by its ubiquity - Numerous sources of contaminations : environment, cross-contaminations, post-contaminations ... [more ▼]

- Performed in Walloon farms in contact with the PDR project - L. monocytogenes characterised by its ubiquity - Numerous sources of contaminations : environment, cross-contaminations, post-contaminations, mastitis,… [less ▲]

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See detailControl of Listeria monocytogenes in dairy farms.
Di Tanna, Sybille ULg; Belleflamme, Christel ULg; Anceau, Christine ULg et al

in Proceedings of the Ninth conference on food microbiology (2004, September)

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See detailControl of living anionic polymerization of (meth)acrylates : active complex species, macromolecular engineering and possible scaling-up
Teyssié, Philippe; Bayard, Philippe; Jérôme, Robert ULg et al

in Macromolecular Symposia (1995), 98

Tailored polymerization of acrylic and methacrylic esters, particularly methyl methacrylate (MMA), has been the topic of a frantic research effort during the last decade. It is the purpose of this paper ... [more ▼]

Tailored polymerization of acrylic and methacrylic esters, particularly methyl methacrylate (MMA), has been the topic of a frantic research effort during the last decade. It is the purpose of this paper to present one of the main lines of that quest, and to evaluate its potential versus other new approaches. [less ▲]

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See detailControl of Lymphoepithelial Interactions within Thymic Nurse Cells by Gamma-Interferon and Tumor Necrosis Factor Alpha. Possible Role in the Modulation of Intrathymic Education?
Defresne, Marie-Paule ULg; Humblet, Chantal ULg; Rongy, A. M. et al

in Thymus (1989), 13(3-4), 201-4

The role of cytokines in the process of intrathymic differentiation is not yet clearly established. The results presented in this paper demonstrate that interferon-gamma and tumor necrosis factor-alpha ... [more ▼]

The role of cytokines in the process of intrathymic differentiation is not yet clearly established. The results presented in this paper demonstrate that interferon-gamma and tumor necrosis factor-alpha regulate 'in vivo' and 'in vitro' the interactions between epithelial cells and thymocytes within thymic nurse cells. The mechanism of action of these cytokines and their possible physiologic role 'in vivo' are discussed. [less ▲]

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See detailControl of molecular dynamics with zero-area fields. application to molecular orientation and photodissociation
Sugny, Dominique; Vranckx, Stéphane; Ndong, Mamadou et al

in Physical Review A (2014), 90

The constraint of time-integrated zero area on the laser field is a fundamental requirement, both theoretically and experimentally, in the control of molecular dynamics. By using techniques of local and ... [more ▼]

The constraint of time-integrated zero area on the laser field is a fundamental requirement, both theoretically and experimentally, in the control of molecular dynamics. By using techniques of local and optimal control theory, we show how to enforce this constraint in two benchmark control problems, namely, molecular orientation and photofragmentation. The origin and the physical implications for the dynamics of this zero-area control field are discussed. [less ▲]

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See detailControl of nuclear sample polarization using optical pumping and radio-frequency methods
Lenaers, Florence ULg; Glover, Rohan ULg; Bastin, Thierry ULg

Conference (2015, May 27)

Laser-cooled and trapped radioactive isotopes are now being used to probe the properties of the weak interaction in nuclear beta decay. In this context, it is essential that one be able to control the ... [more ▼]

Laser-cooled and trapped radioactive isotopes are now being used to probe the properties of the weak interaction in nuclear beta decay. In this context, it is essential that one be able to control the nuclear polarization of the atomic samples. We present two polarization/depolarization schemes for argon-35, whose mirror transition to chlorine-35 is a particularly sensitive candidate for precision measurements in nuclear beta decay. [less ▲]

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See detailControl of ordered mesoporous molecular sieves synthesis using non-ionic surfactants by incorporation of transition metal ions in the micellar solution
Léonard, Alexandre ULg; Blin, Jean-Luc; Herrier, Gontran et al

in Studies in Surface Science and Catalysis (2003), 146

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See detailControl of perimenstrual flares of perioral dermatitis by isotretinoin
Nikkels, Arjen ULg; Pierard, Gérald ULg

in Journal of Dermatological Treatment (2000), 11

BACKGROUNDS: Some cases of perioral dermatitis (POD) appear in young women after the interruption of oral contraception. Perimenstrual POD flares may also occur. Blue-brown, post-inflammatory macules and ... [more ▼]

BACKGROUNDS: Some cases of perioral dermatitis (POD) appear in young women after the interruption of oral contraception. Perimenstrual POD flares may also occur. Blue-brown, post-inflammatory macules and atrophic scarring often persist. Conventional treatment modalities include topical and oral tetracyclines, topical metronidazole and oral contraceptives. However, such therapies mau fail or offer only transient results. Isotretinoin efficacy was reported in a patient with difficult-to-treat POD. METHODS: We studied the outcome of a 6-month course of isotretinoin with a 1-year follow-up in 14 women suffering from chronic or recurrent POD refractory to or dependent on long-term conventional treatments. The isotretinoin dosing regiments were based on acne management guidelines. RESULTS: At 1-year follow-up, 12 of 14 (85,7 %) of the women remained free of POD recurrences, one patient (7,1 %) experienced a significant improvement, and one patient (7,1 %) showed only transient improvement during therapy, and rapidly relapsed after completing two 6-month treatment courses. The muco-cutaneous side effects were similar to those already known for isotretinoin. No other adverse effects occured. CONCLUSION: Isotretinoin represents a valuable therapeutic alternative for women suffering from chronic or recurrent POD refractory to or dependent on conventional treatment options. [less ▲]

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See detailControl of phase shifting transformers by multiple transmission system operators
Marinakis, Adamantios ULg; Glavic, Mevludin; Van Cutsem, Thierry ULg

(2007, July)

A general framework is proposed for the control of phase shifting transformers owned by several TSOs, taking into account their interactions. The proposed solution is the Nash equilibrium of a sequence of ... [more ▼]

A general framework is proposed for the control of phase shifting transformers owned by several TSOs, taking into account their interactions. The proposed solution is the Nash equilibrium of a sequence of optimizations performed by the various TSOs, each of them taking into account the other TSOs’ control settings as well as operating constraints relative to the whole system. The method is applied to a linearized network model and illustrated on the IEEE 118-bus system. [less ▲]

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