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See detailComplex modulation of singing behavior by testosterone in an open-ended learner, the European Starling.
Van Hout, Alain J*-M; Eens, Marcel; Balthazart, Jacques ULg et al

in Hormones & Behavior (2009), 56(5), 564-73

In many temperate zone songbird species males only produce song during the breeding season, when plasma testosterone (T) levels are high. Males of some species sing throughout the year, even when T levels ... [more ▼]

In many temperate zone songbird species males only produce song during the breeding season, when plasma testosterone (T) levels are high. Males of some species sing throughout the year, even when T levels are low, indicating a dissociation between high T levels and song rate. Given that few studies have taken advantage of these species, we compare here song traits expressed under high versus low T concentrations and we study the role of testosterone in adult song learning in the European Starling, an open-ended learner in which repertoire size dramatically increases with age. We performed a detailed comparison of song complexity and song rate between fall and spring in 6-year-old intact male European starlings. In parallel, we investigated whether potential seasonal changes were regulated by the gonadally induced increase in plasma T, by comparing seasonal changes in intact and castrated males of the same age (castrated as juveniles during their first fall) and by subsequently experimentally elevating T in half of the castrated males. While song rate and stereotypy did not differ between intacts and castrates or between fall and spring, both groups increased their average song bout length from fall to spring, but only intact males increased their repertoire size, indicating that effects of seasonal T changes differ between song traits. Intact males overall displayed a larger song repertoire and a longer bout length than the castrates, and implantation with T caused a turnover in repertoire composition in castrates. However, as the castrates had never experienced high T levels and yet displayed a markedly higher repertoire size than that of typical yearling males, this suggests that the progressive increase of song repertoire with age in male starlings is not dependent on gonadal T, although it may be T-enhanced. [less ▲]

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See detailComplex populations of minor pathogens associated with roots from barley plants infected by barley yellow mosaic virus.
Ijdenberg, P.; Kummert, J.; Lepoivre, Philippe ULg

in Parasitica (1986), 42(4),

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See detailThe Complex Problem of Ards: Pathophysiology, Management
Lamy, Maurice ULg

in Acta Anaesthesiologica Belgica (1988), 39(3 Suppl 2), 37-41

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See detailComplex protists in Mesoproterozoic rocks.
Javaux, Emmanuelle ULg; Knoll, A. H.; Walter, Malcolm

Conference (2001)

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See detailComplex protists in Mesoproterozoic rocks.
Javaux, Emmanuelle ULg; knoll, A. H.; Walter, M.

Conference (2001, April)

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See detailComplex regulation of the FRD3 gene in Arabidopsis relatives
Charlier, Jean Benoit; Polese, Catherine ULg; Nouet, Cécile ULg et al

Poster (2014, March 31)

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See detailComplex regulation of the FRD3 gene in Arabidopsis relatives
Charlier, Jean-Benoit ULg; Polese, Catherine ULg; Nouet, Cécile ULg et al

Poster (2013, February 26)

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See detailComplex Risks from Old Urban Waste Landfills: Sustainability Perspective from Iasi, Romania
Ciumasu, I.; Costica, M.; Costica, N. et al

in Journal of Hazardous Materials (2012), 16

Landfills continue to represent the most frequent managerial practice for municipal solid wastes and an increasing and complex problem globally. In certain countries, a transition to an open society and ... [more ▼]

Landfills continue to represent the most frequent managerial practice for municipal solid wastes and an increasing and complex problem globally. In certain countries, a transition to an open society and free market is superimposed on the transition to sustainability, resulting in even higher complexity of management. This paper proposes an approach for problem-structuring of landfills in complex transitions: sustainability or unsustainability of a management approach is determined by a set of sustainability filters that are defined by sets of indicators and prioritized according the systemic concept of sustainability, which says that economy is embedded in society, which is embedded in nature. The writers exercise this approach with an old landfill in Iasi, Romania, and conclude for unsustainability, because the ecological sustainability filter is not successfully passed. Social and economic sustainability filters are also discussed in relation with the ecological sustainability indicators. The described approach allows a coherent, transdisciplinary synthesis of knowledge scattered across various disciplines, a pervasive problem in landfill management. The case study helps distinguish between generally true and context-dependent aspects. [less ▲]

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See detailComplex structure of cometary bands tentatively ascribed to the contour of the solar spectrum
Swings, Polydore ULg

in Lick Observatory Bulletin (1941), 19

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See detailThe complex structure of the Ca II (H and K) lines in the spectrum of the A0ep star with infrared excess HD 190073. II. Interpretation: the selective effect of radiative forces.
Surdej, Jean ULg; Swings, Jean-Pierre ULg

in Astronomy and Astrophysics (1976), 47

Abstract image available at: http://esoads.eso.org/abs/1976A&A....47..121S

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See detailThe complex structure of the Ca II (H and K) lines in the spectrum of the AOep star with infrared excess HD190073
Surdej, Jean ULg; Swings, Jean-Pierre ULg

in Slettebak, A. (Ed.) IAUS 70: Be and Shell Stars (1976)

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See detailComplex structures in the calculated photoionization spectrum of CO in the 17-17.5 eV energy region.
Leyh, Bernard ULg; Raseev, Gheorghe

in Journal of Chemical Physics (1988), 89(2), 820-829

Complicated spectral features appear in the CO photoionization spectra between 17 and 17.5 eV photon energy. In order to interpret these processes, we refine in the present paper our previous model [B ... [more ▼]

Complicated spectral features appear in the CO photoionization spectra between 17 and 17.5 eV photon energy. In order to interpret these processes, we refine in the present paper our previous model [B. Leyh and G. Raseev, Phys.Rev. A34, 2920 (1986)] by introducing all the vibrational levels of the first three electronic states of CO+. This more accurate treatment leads to two major results. The resonance at 17.1 eV and 17.3 eV are complex resonances resulting from the interaction between the Rydberg series converging to the A2Pi and B2Sigma+ ionic states: they can no more be assigned simply to Rydberg states converging to CO+ B2Sigma+. The intermediate experimental feature at 17.2 eV, missing in our previous calculation, is now present in the theoretical spectrum. Mainly, this feature, which we have called composite resonance, is a broadned (by the experimental resolution) superposition of Rydberg states converging to the A2Pi,v+=4 state. In this paper, we present and analyze the vibrationally resolved cross sections and symmetry parameter for the X2Sigma+,v+=0-3 and A2Pi,v+0-4 states. These theoretical results are compared to recent experimental data by Leyh et al. [Chem.Phys.115, 243 (1987)] and by Hardis and co-workers (the preceeding paper). [less ▲]

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See detailComplex subordinators derived from noun complement clauses
Brems, Lieselotte ULg; Davidse, Kristin

in Acta Linguistica Hafniensia : International Journal of Linguistics (2010), 42(2), 101-116

In this article, we investigate the development of complex subordinators from noun complement clauses in English, basing ourselves on the analysis of synchronic data from the COBUILD corpus. We first ... [more ▼]

In this article, we investigate the development of complex subordinators from noun complement clauses in English, basing ourselves on the analysis of synchronic data from the COBUILD corpus. We first present a breadth study of complex subordinators originating in “in þ NP þ that/of-clause”- syntagms and show how these align themselves with oppositions within the causal, temporal and comparative subordinator paradigms. We then offer an in-depth study of the cluster of strings “in (the) hope(s) that/of”, arguing that the subordinators they yield enter as marked members into the subparadigm of purposive conjunctions, which they semantically enrich through lexical and structural persistence. [less ▲]

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See detailComplex transitions in the Bone Mineralization Density Distribution (BMDD) caused by changes in bone turnover
Ruffoni, Davide ULg; Fratzl, Peter; Lukas, Carolin et al

in BONE (2008), 42(1), 64-64

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See detailComplex-scaling approach to the decay of Bose-Einstein condensates
Schlagheck, Peter ULg; Paul, T.

in Physical Review. A (2006), 73(2),

The mean-field dynamics of a Bose-Einstein condensate is studied in the presence of a microscopic trapping potential from which the condensate can escape via tunneling through finite barriers. We show ... [more ▼]

The mean-field dynamics of a Bose-Einstein condensate is studied in the presence of a microscopic trapping potential from which the condensate can escape via tunneling through finite barriers. We show that the method of complex scaling can be used to obtain a quantitative description of this decay process. A real-time propagation approach that is applied to the complex-scaled Gross-Pitaevskii equation allows us to calculate the chemical potentials and lifetimes of the metastably trapped Bose-Einstein condensate. The method is applied to a one-dimensional harmonic confinement potential combined with a Gaussian envelope, for which we compute the lowest symmetric and antisymmetric quasibound states of the condensate. A comparison with alternative approaches using absorbing boundary conditions as well as complex absorbing potentials shows good agreement. [less ▲]

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