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See detailEarly development of the chondrocranium in Chrysichtys auratus (Pisces, Siluriformes, Claroteidae)
Vandewalle, Pierre ULg; Chikou, Antoine; Lalèyé, Philippe et al

in Journal of Fish Biology (1999), 55

The inception and development of the cartilaginous cephalis skeleton of Chrysichthys auratus is described from hatching to about 18 days post-hatching. At hatching, no skeletal structure is present. Not ... [more ▼]

The inception and development of the cartilaginous cephalis skeleton of Chrysichthys auratus is described from hatching to about 18 days post-hatching. At hatching, no skeletal structure is present. Not until day 3 do clearly delimited cranial primordia become apparent. As in many siluriforms, the neurocranium is platybasic from the start, the suspensorium constitutes, with Meckel’s cartilage and the hyoid bar, a single cartilaginous element, and the junction between the front and rear of the neurocranium is complete on day 4. By day 8 the quadratomandibular joint has formed and the tectum posterius has appeared. Cartilage reduction first affects the trabecular bars, then, markedly, the visceral arches. By day 18 the braincase floor has almost disappeared. [less ▲]

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See detailearly development of the condrocranium in Chrysichtys auratus (Siluriformes, Claroteidae)
Vandewalle, Pierre ULg; Chikou, Antoine; Lalèyé, Philippe et al

Poster (1998)

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See detailEarly development of the head skeleton in Brycon moorei (Pisces, Ostariophysi, Characidae)
Vandewalle, Pierre ULg; Germeau, G.; Besancenet, P. et al

in Journal of Fish Biology (2005), 66(4), 996-1024

At hatching (15 h post fertilization), Brycon moorei possesses no skeletal structure. Thereafter, development is very rapid. The first oral teeth appear no later than 3 It post-hatching, but they remain ... [more ▼]

At hatching (15 h post fertilization), Brycon moorei possesses no skeletal structure. Thereafter, development is very rapid. The first oral teeth appear no later than 3 It post-hatching, but they remain covered with epithelium until c. 45 h. At 7 h, the trabecular bars and part of the cartilaginous visceral arches are visible and at 15 It, the dentaries and premaxillaries are present. At 25 h, i.e. the onset of piscivory and cannibalism (the yolk sac is only fully resorbed after 36 h), the oral teeth are fully developed, the first pharyngeal teeth are formed, and some head movements already appear synchronized, but the mouth cavity is not completely isolated from the neurocranium by bony structures. Thereafter, no new buccal or pharyngeal bony structure is visible until 45 h, when the maxilla and opercula appear, along with a new type of cannibalistic behaviour. Cartilage resorptions also start at 45 It, but with no concomitant replacement by formation of calcified structures. Later, development gradually becomes similar to that of many previously studied teleosts. The developmental pattern of B. moorei is thus extremely rapid in comparison with other teleosts, i.e. it prioritizes feeding structures that permit the expression of piscivory at a very early age. The uniqueness of this pattern is discussed in relation to ecological constraints on early feeding and fast growth. (c) 2005 The Fisheries Society of the British Isles. [less ▲]

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See detailEarly developmental actions of endocrine disruptors on the hypothalamus, hippocampus, and cerebral cortex.
Parent, Anne-Simone ULg; Naveau, Elise ULg; GERARD, Arlette ULg et al

in Journal of Toxicology and Environmental Health. Part B, Critical Reviews (2011), 14(5-7), 328-45

Sex steroids and thyroid hormones play a key role in the development of the central nervous system. The critical role of these hormonal systems may explain the sensitivity of the hypothalamus, the ... [more ▼]

Sex steroids and thyroid hormones play a key role in the development of the central nervous system. The critical role of these hormonal systems may explain the sensitivity of the hypothalamus, the cerebral cortex, and the hippocampus to endocrine-disrupting chemicals (EDC). This review examines the evidence for endocrine disruption of glial-neuronal functions in the hypothalamus, hippocampus, and cerebral cortex. Focus was placed on two well-studied EDC, the insecticide dichlorodiphenyltrichloroethane (DDT) and polychlorinated biphenyls (PCB). DDT is involved in neuroendocrine disruption of the reproductive axis, whereas polychlorinated biphenyls (PCB) interact with both the thyroid hormone- and sex steroid-dependent systems and disturb the neuroendocrine control of reproduction and development of hippocampus and cortex. These results highlight the impact of EDC on the developing nervous system and the need for more research in this area. [less ▲]

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See detailAn Early Devonian flora, including Cooksonia from the Paraná Basin (Brazil)
Gerrienne, Philippe ULg; Bergamaschi, S.; Pereira, E. et al

in Review of Palaeobotany and Palynology (2001), 116

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See detailThe Early Devonian plants from the Ancenis Basin (Armorican Massif, France): one century later...
Strullu-Derrien, Marie-Christine; Gerrienne, Philippe ULg

Conference (2008)

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See detailEarly diagenesis of skeletal remains in marine sediments : a 10 years study
Poulicek, Mathieu ULg; Goffinet, Gerhard ULg; Jeuniaux, Charles ULg et al

in Bulletin de la Société royale de Liège (1988), 57(4-5), 313-330

A 10 years long expereimental approach of weathering processes affecting "fresh" organoclastic material at various depths (0-4800 meters) in different regions of the world allowed us to characterize, from ... [more ▼]

A 10 years long expereimental approach of weathering processes affecting "fresh" organoclastic material at various depths (0-4800 meters) in different regions of the world allowed us to characterize, from an ecological point of view, the endolithic populations and associated microorganisms and to evaluate their role in the maturation of organoclastic sediments. We defined the rules governing the settling, growth and succession patterns of the microborers populations depend on environmental conditions (depth, t°, pO2, ...) in a way that will enable future modelisation work. From a general point of view, the prime alteration affecting skeletal remains is of biological origin. It is due to microorganisms growing onto and inside the skeletons, at the precise level of the organic matrices, that weather the organic compounds of these matrices by discharging specific hydrolases at their contact. A fast step of extraction of the most labile compounds (high speed constant) precedes a much slower biodegradation step of refractory compounds. Anaerobic biodegradation takes place after aeroibic biodegradation. Other kinds of microorganisms appear implicated but anaerobic biodegradation processes do not intrinsically differ and do not develop slowlier. Its apparent slowness mainly proceeds from the fact that only refractory compounds of the skeletal matrices usually reach the anoxic layers of the sediments. Anaerobic microbiocenoses associated with skeletal carbonates appear adapted to the biodegradation of such less labile compounds of the organic matrices. Early biological diagenesis events have important repercussions on other diagenetic, physical as well as chemical processes. From a mechanical standpoint, the biological extraction of the organic "cement" between skeletal crystallites fasten abrasion processes by reducing the general cohesion of the skeleton. Moreover, grazing and browsing organisms seeking for endolithic microflora contribute to such abrasion and disruption phenomenons. This leads to an appeciable increase of the CaCO3 content of the fine grain size fraction of sediments. From a chemical point of view, the disparition of the organic sheaths protecting CaCO3 joined to crushing and abrasion effects greatly increase the carbonate dissolution phenomenons and, paradoxally, even in thermodynamically supersaturated media like shallow tropical environment. From that point of view, the importance of high magnesian calcites, their microstructures and organic content, have to be stressed in connection with the control of the buffering capacity of marine waters. [less ▲]

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See detailEarly diagnosis of myocardial infarction by measuring the tissue isoform of CK-MB in serum
Chapelle, Jean-Paul ULg

in Annales de Biologie Clinique (1993), 51

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See detailEarly diagnosis of myocardial infarction using a new automated immunoassay for serum myoglobin
Chapelle, Jean-Paul ULg; El Allaf, Dia ULg

in European Heart Journal Supplements : Journal of the European Society of Cardiology (1993), 14(Abs. suppl.), 32

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See detailEarly Earth biosphere and possible spectral biosignatures in atmospheres of exoplanets
Riaud, Pierre; Javaux, Emmanuelle ULg

Conference (2005)

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See detailEarly Earth, extremophiles and Exobiology
Javaux, Emmanuelle ULg

Conference (2005)

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See detailEarly effect of hyaluronic acid intra-articular injections on serum and urine biomarkers in patients with knee osteoarthritis: An open-label observational prospective study.
Conrozier, T.; Balblanc, J. C.; Richette, P. et al

in Journal of Orthopaedic Research (2011)

The aim of the study was to investigate the effect of hyaluronic acid (HA) intra articular injections (IA) on osteoarthritis (OA) biomarkers in patients with knee OA. Prospective open label study. Fifty ... [more ▼]

The aim of the study was to investigate the effect of hyaluronic acid (HA) intra articular injections (IA) on osteoarthritis (OA) biomarkers in patients with knee OA. Prospective open label study. Fifty-one patients with unilateral symptomatic K-OA received IA injections of 2mL of HA on days (D) 1, 7, 14 and were followed 3 months. At D-15 patients were examined and X-rays performed, to exclude patients with bilateral K-OA, or those with more than three symptomatic OA joints. From 15 days (D-15) before the first injection to D90 concomitant therapies were unchanged. Walking pain (WP) on VAS was obtained at each visit. Urine (U) and serum (S) samples were obtained at D-15, D1, D30, and D90. S-C2C, S-Cartilage oligomeric matrix protein, S-HA, S-CS 846 epitope, S-type II collagen propeptide, and U-type II collagen C telopeptide (U-CTX II/creatinin) were assayed. Predictive factors of response were analyzed using logistic regression. Correlations between variables were obtained using Spearman test. Forty-five patients were analyzed. Between D-15 and D1 there was no difference for any biomarkers At D1, WP (SD) was correlated with U-CTX II/creat (p = 0.006). Between D1 and D90: U-CTX II/creat decreased significantly. After adjustment for confounding variables there was a significant correlation between clinical response and U-CTX II/creat variation. U-CTX II and S-HA at baseline were independently predictive of clinical response. This study showed that 90 days after HA IA injections, U-CTX II levels significantly decrease compared to baseline, suggesting a slowdown of type II collagen degradation. (c) 2011 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res. [less ▲]

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See detailEarly effect of strontium ranelate on clinical vertebral fractures in women with postmenopausal osteoporosis
Meunier, P. J.; Marquis, P.; Lemmel, E. M. et al

in BONE (2003), 32(S7), 222

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See detailThe early eukaryote fossil record
Javaux, Emmanuelle ULg

in Jékely, Gáspár (Ed.) Evolution of the Eukaryotic Endomembrane System and Cytoskeleton (2006)

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See detailEarly eukaryotes in Paleoproterozoic and Mesoproterozoic oceans
Javaux, Emmanuelle ULg; Marshall, C.; Xiao, S. et al

Poster (2004)

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See detailEarly eukaryotic diversification
Javaux, Emmanuelle ULg; knoll, A. H.; Walter, M.

Conference (2002)

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