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See detailHigh-Yield Synthesis of a (3H)Ethylenediamine Ditetrodotoxin Derivative
Bontemps, José; Cantineau, Robert; Grandfils, Christian ULg et al

in Analytical Biochemistry (1984), 139

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See detailEstradiol contributes to the postnatal demasculinization of female Japanese quail (Coturnix coturnix japonica).
Balthazart, Jacques ULg; Schumacher, M.

in Hormones and Behavior (1984), 18(3), 287-97

Two experiments were performed to characterize the process of postnatal demasculinization in Japanese quail. In the first experiment, it was shown that estradiol (E2) can complete female demasculinization ... [more ▼]

Two experiments were performed to characterize the process of postnatal demasculinization in Japanese quail. In the first experiment, it was shown that estradiol (E2) can complete female demasculinization during the first 4 weeks of life. By contrast, E2 did not demasculinize sexual behavior and cloacal gland in neonatally castrated males. Neonatally gonadectomized females preferentially performed mount attempts when tested in their home cage by comparison to a test arena. In Experiment 2, E2 Silastic implants (40-mm) maintained full copulatory behavior in castrated males but not in females. This large dose of E2 did not demasculinize adult sexually active birds (males or females) even if treatment lasted for 1 month. It is concluded that E2 can demasculinize sexual behavior only in females and only if treatment is performed in very young birds. [less ▲]

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See detailThe postnatal demasculinization of sexual behavior in the Japanese quail (Coturnix coturnix japonica).
Schumacher, M.; Balthazart, Jacques ULg

in Hormones and Behavior (1984), 18(3), 298-312

Three experiments were performed to analyze the time course of demasculinization in the Japanese quail and to test the activating and organizing effects of estradiol (E2) in adult sexually active birds ... [more ▼]

Three experiments were performed to analyze the time course of demasculinization in the Japanese quail and to test the activating and organizing effects of estradiol (E2) in adult sexually active birds. In Experiment 1, males and females were castrated at the age of 1 day or 1, 2, 4, and 6 weeks and treated as adults with testosterone (T). The age of castration had no effect on behavior and morphology in males. Plasma gonadotrophins (LH and FSH) were, however, higher in males castrated at or before than in those castrated after 2 weeks of age. This suggests that postnatal testicular secretions have organizing effects on the pituitary activity. Females which were castrated before 1 week of age were less sensitive to the activating effects of T than males, but were not fully demasculinized. The demasculinization of different reproductive characteristics such as male sexual behavior, cloacal gland size, and weight of the syringeal muscles is achieved in females at different times posthatching. In Experiment 2, castration of male and female quail at the ages of 4 days or 4 weeks confirmed that postnatal ovarian secretions contribute to the full behavioral and morphological demasculinization of females. It is easier to elicit mounting in T-treated females when they are tested in their home cage instead of a test arena. This difference was not observed in males. During Experiment 3, it was impossible to demasculinize sexually active adult males or females by treatment with Silastic implants of E2. E2 did not maintain sexual behavior in ovariectomized females showing male sexual behavior when treated with T but maintained the behavior in males. [less ▲]

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See detailEffect of the presence of females on the pituitary-testicular activity in male Japanese quail (Coturnix coturnix japonica).
Delville, Y.; Sulon, J.; Hendrick, J. C. et al

in General and Comparative Endocrinology (1984), 55(2), 295-305

Five experiments were carried out to study the role of the presence of a female on the reproductive endocrinology of male Japanese quail. In the first three experiments, exposure of an adult male raised ... [more ▼]

Five experiments were carried out to study the role of the presence of a female on the reproductive endocrinology of male Japanese quail. In the first three experiments, exposure of an adult male raised in long days to a female for l0 min or l week failed to increase plasma testosterone and LH levels; in fact a significant transitory decrease in plasma testosterone was observed, associated with a preceding increase in plasma corticosterone. These changes are interpreted as a result of the stress caused by repeated bleeding or by the continuous presence of a female in a limited space. In the last two experiments, an increase in the maturation rate of immature males could be observed in birds maintained in the continuous presence of females by comparison with birds kept in isolation. The paired males had larger cloacal glands and testes and higher plasma levels of testosterone and LH than the isolated one. This effect of the female was observed in long days (l6L:8D) as well as in marginally stimulating short days (l2L:l2D). [less ▲]

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See detailRelative potencies of testosterone and 5 alpha-dihydrotestosterone on crowing and cloacal gland growth in the Japanese quail (Coturnix coturnix japonica).
Balthazart, Jacques ULg; Schumacher, M.; Malacarne, G.

in Journal of Endocrinology (1984), 100(1), 19-23

It has been suggested that testosterone is less effective at inducing crowing behaviour in young birds than in adults because of the presence of higher levels of steroid 5 beta-reductase in the young ... [more ▼]

It has been suggested that testosterone is less effective at inducing crowing behaviour in young birds than in adults because of the presence of higher levels of steroid 5 beta-reductase in the young brain, which converts testosterone to inactive 5 beta-reduced metabolites. This hypothesis was tested indirectly by comparing the relative potencies of 5 alpha-dihydrotestosterone (5 alpha-DHT), which cannot be converted to 5 beta-metabolites, and testosterone at inducing crowing in young gonadectomized male and female quail. The promotion of cloacal gland growth by these treatments was also assessed since there are no age-related changes in 5 beta-reductase in this organ. Silicone elastomer implants (2 X 5, 5 and 10 mm) containing 5 alpha-DHT were more effective at stimulating crowing than similar implants of testosterone whilst there was little difference in their potency at inducing cloacal gland growth. These results are consistent with the hypothesis that brain steroid 5 beta-reductase regulates the behavioural activity of testosterone in the brain of young birds. [less ▲]

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See detailDynamique et production printanière du Mysidacé Leptomysis lingvura en baie de Calvi
Dauby, Patrick ULg

in Annales de la Société Royale Zoologique de Belgique (1984), 114((suppl. 1)), 196

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See detailErlebald (+ 1193), gardien des reliques de Stavelot-Malmedy
George, Philippe ULg

in Moyen Age (Le) (1984), XC

La personnalité d'Erlebald, frère de Wibald, pour la première fois mise en évidence dans le soin apporté aux reliques et aux oeuvres d'art de l'abbaye de Stavelot-Malmedy

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See detailEffect of grazing method, nitrogen level, supplementary feeding and stocking rate on the performance of young grazing bulls
Bienfait, Jean-Marie ULg; Gielen, Marc ULg; Limbourg, Pierre et al

in A seminar of the CEC. Grassland Beef Production (1984)

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See detailMétropoles européennes : dynamique urbaine et problèmes d'aménagement
Merenne-Schoumaker, Bernadette ULg

in CASSOU-MOUNAT, Micheline (Ed.) Les Métropoles : des villes à activités spécifiques (1984)

Summary of research conducted as part of File No. 6066 "European cities" of the French Photographic Documentation

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See detailEffect of nasal administration of synthetic salmon calcitonin on Paget's disease of bone
Reginster, Jean-Yves ULg; Franchimont, P

in Calcified Tissue International (1984), 36(S2), 77

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See detailStudy of the Zn-containing DD-carboxypeptidase of Streptomyces albus G by small-angle X-ray scattering in solution.
Labischinski, Harald; Giesbrecht, Peter; Fischer, E. et al

in European Journal of Biochemistry (1984), 138(1), 83-87

Study of the Zn2+-containing D-alanyl-D-alanine-cleaving carboxypeptidase of Streptomyces albus G by small-angle X-ray scattering in solution yielded the following molecular parameters: radius of gyration ... [more ▼]

Study of the Zn2+-containing D-alanyl-D-alanine-cleaving carboxypeptidase of Streptomyces albus G by small-angle X-ray scattering in solution yielded the following molecular parameters: radius of gyration R = 1.82 +/- 0.05 nm; largest diameter D = 5.9 +/- 0.2 nm; relative molecular mass Mr = 17000 +/- 2000; volume V approximately equal to 35 +/- 2 nm3; degree of hydration: 0.25 +/- 0.02 g water/g protein. By reference to theoretical scattering curves of rigid triaxial homogeneous bodies, a model which fits all experimental data is an elliptical cylinder. Such a model is compatible with that observed in the crystal structure. At those high concentrations necessary to form inactive enzyme-ligand associations the non-competitive beta-lactam inhibitors, cephalothin and cephalosporin C, drastically altered the scattering behaviour of the protein. [less ▲]

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See detailMythe de la gratuité et réalité psychosociale
Malchair, Alain ULg

in Acta Psychiatrica Belgica (1984), 84(5), 458-465

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See detailEvolution, en fonction de l'age et du sexe, de l'uree, de la creatinine et de la clairance de la creatinine.
El Allaf, Dia ULg; Marchal, C.; El Allaf, M. et al

in Archives Internationales de Physiologie et de Biochimie (1984), 92(3), 249-54

Serum urea and creatinine concentrations were determined in 150 healthy subjects. The formula of Cockcroft and Gault was used in order to calculate creatinine clearance. Such estimation of creatinine ... [more ▼]

Serum urea and creatinine concentrations were determined in 150 healthy subjects. The formula of Cockcroft and Gault was used in order to calculate creatinine clearance. Such estimation of creatinine clearance is widely used as a parameter for individualization of dosage of drugs secreted primary via the kidneys. The effects of age and sex were then assessed on serum urea, serum creatinine and on creatinine clearance. [less ▲]

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See detailSynthesis of Communicating Processes from Temporal Logic Specifications
Manna, Zohar; Wolper, Pierre ULg

in ACM Transactions on Programming Languages & Systems (1984), 6(1), 68-93

In this paper, Propositional Temporal Logic (PTL) is applied to the specification and synthesis of the synchronization part of communicating processes. To specify a process, a PTL formula that describes ... [more ▼]

In this paper, Propositional Temporal Logic (PTL) is applied to the specification and synthesis of the synchronization part of communicating processes. To specify a process, a PTL formula that describes its sequence of communications is given. The synthesis is done by constructing a model of the given specifications using a tableau-like satisfiability algorithm for PTL. This model can then be interpreted as a program. [less ▲]

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See detailSurveillance hémodynamique et traitement symptomatique du choc infectieux
D'Orio, Vincenzo ULg; EL ALLAF, D; MARCELLE, R

in Médecine et Hygiène (1984), 42

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See detailHagiographie hutoise
George, Philippe ULg

in Huy. Trésors d'Arts Religieux, Collégiale Notre-Dame, p. 14-18 (1984)

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See detailSeries episcoporum Ecclesiae Catholicae Occidentalis, t. I
George, Philippe ULg

in Moyen Age (Le) (1984)

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See detailTiming competence and timing performance: A comparative approach
Richelle, Marc ULg; Lejeune, Helga ULg

in Gibbon, J. (Ed.) Timing and time perception (1984)

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