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See detailPotamon: A Dynamic Model for Predicting Phytoplankton Composition and Biomass in Lowland Rivers
Everbecq, Etienne ULg; Gosselain, Véronique ULg; Viroux, Laurent et al

in Water Research (2001), 35(4), 901-12

POTAMON is a unidimensional, non-stationary model, designed for simulating potamoplankton from source to mouth. The forcing variables are discharge, river morphology, water temperature, available light ... [more ▼]

POTAMON is a unidimensional, non-stationary model, designed for simulating potamoplankton from source to mouth. The forcing variables are discharge, river morphology, water temperature, available light and nutrient inputs. Given the description of several algal categories, POTAMON allows to simulate algal "successions" at a particular site, as well as longitudinal changes of potamoplankton composition and biomass. The algal categories differ by their physiology, their loss rates, and their sensitivity to grazing by zooplankton. Two zooplankton categories were considered, Brachionus-like and Keratella-like, which differ by their clearance rate, their incipient limiting level, their selectivity towards phytoplankton, and their growth yield. The model simulates satisfactorily the onset and the magnitude of the phytoplankton spring bloom in the Belgian part of R. Meuse, the biomass decrease in early summer, and the autumn bloom. It also renders the major variations of algal assemblages along the river. The model allows to confirm that the main driving variables of potamoplankton dynamics in a eutrophic river are physical factors: discharge and related variables (e.g. retention time), light and temperature. In addition, the simulations confirm that the zooplankton-phytoplankton interaction may result in phytoplankton biomass fluctuations and compositional changes. POTAMON can be useful to explore plankton dynamics in a large river, and it may become a tool to test various management measures. [less ▲]

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See detailPotassic and ultrapotassic dikes around the plutons of Biella and Traversella
Bogaerts, Michel; Vander Auwera, Jacqueline ULg

in Documents du BRGM (1999), 290

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See detailPotassium effect on Na(+), K(+)-ATPase activity of cultured newborn rat astroblasts during differentiation.
Moonen, Gustave ULg; FRANCK, G.

in Neuroscience Letters (1977), 4(5), 263-7

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See detailPotassium-Induced Release of an Endogenous Toxic Activity for Outer Hair Cells and Auditory Neurons in the Cochlea: A New Pathophysiological Mechanism in Meniere's Disease?
Lefebvre, Philippe ULg; Weber, T.; Rigo, Jean-Michel et al

in Hearing Research (1990), 47(1-2), 83-93

In Meniere's disease, the increase of extracellular potassium concentration in the perilymph is thought to play a key role in determining the progressive loss of cochlear hair cells. In this paper, we ... [more ▼]

In Meniere's disease, the increase of extracellular potassium concentration in the perilymph is thought to play a key role in determining the progressive loss of cochlear hair cells. In this paper, we describe a serum-free culture preparation of hair cells from 5 day-old rat and report the release by the cochlea, in response to an increase of extracellular potassium concentration, of a cytotoxic activity active on hair cells and auditory neurons. The toxic activity is associated with low molecular weight (less than 10,000 Dalton) molecule(s) as revealed by ultrafiltration. Morphological studies performed on the organ of Corti incubated during 24 h in the presence of the cochlea-derived toxic activity (CTA), show that this factor is toxic for hair cells and not for supporting or surrounding cells. The release of CTA occurs both in the spiral ganglion and in the organ of Corti. We suggest that this cochlea-derived toxic activity may play an important role in the pathophysiology of the hearing loss that occurs during the progression of Meniere's disease. [less ▲]

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See detailPotassium-induced release of neurotoxic activity by astrocytes
Lefebvre, Philippe ULg; Rogister, Bernard ULg; Delrée, Paul et al

in Brain Research (1987), 413

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See detailPotato (Solanum Tuberosum L.) Tuber Ageing Induces Changes In The Proteome And Antioxidants Associated With The Sprouting Pattern
Delaplace, Pierre ULg; Fauconnier, Marie-Laure ULg; Sergeant, K. et al

in Journal of Experimental Botany (2009), 60(4), 1273-1288

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See detailPotato (Solanum Tuberosum L.) Tuber Physiological Age Index Is A Valid Reference Frame In Postharvest Ageing Studies
Delaplace, Pierre ULg; Brostaux, Yves ULg; Fauconnier, Marie-Laure ULg et al

in Postharvest Biology & Technology (2008), 50(1), 103-106

Essential yield components of potato crops are influenced by the physiological age of the tubers at planting. Previous studies have attempted to develop biophysical, physiological or biochemical markers ... [more ▼]

Essential yield components of potato crops are influenced by the physiological age of the tubers at planting. Previous studies have attempted to develop biophysical, physiological or biochemical markers of potato tuber ageing. This research note focuses on characterising a physiological age index (PAI) based on sprouting parameters and originally developed by Caldiz et al. [Caldiz, D.O., Fernandez, L.V., Struik, P.C., 2001. Physiological age index: a new, simple and reliable index to assess the physiological age of seed potato tubers based on the haulm killing date and length of the incubation period. Field Crop. Res. 69, 69–79]. The PAI progression of two cultivars (‘Bintje’ and ‘Désirée’) was measured and modelled over 2 harvest years. The preliminary results were consistent with other ageing markers such as the incubation period (IP) and desprouting sensitivity. Under our experimental conditions, the PAI allowed us to describe cultivar-specific and harvest year-specific age variations measured from the time the haulm (foliage) was killed and the mother plant's influence on the tubers was no longer present. By contrast, the IP data displayed a higher inherent variability that impaired their discrimination ability. Critical PAI values corresponding to the main postharvest developmental steps (e.g., dormancy, apical dominance, multiple sprouting) were then identified on the basis of emergence pattern data, allowing us to propose this index as a useful reference frame for future ageing studies. [less ▲]

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See detailPotato chloroplasts express an intron-encoded maturase-like polypeptide
du Jardin, Patrick ULg; Portetelle, Daniel ULg; Harvengt, L. et al

in Archives Internationales de Physiologie, de Biochimie et de Biophysique (1993), 101

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See detailPotato Tuber Phospholipids Contain Colneleic Acid In The 2-Position
Fauconnier, Marie-Laure ULg; Williams, Td.; Marlier, M. et al

in FEBS Letters (2003), 538(1-3),

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See detailPotato Tuber Proteomics: Comparison Of Two Complementary Extraction Methods Designed For 2-De Of Acidic Proteins
Delaplace, Pierre ULg; Van Der Wal, F.; Dierick, Jf. et al

in Proteomics (2006), 6(24), 6494-6497

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See detailPotato Tuber Sprouting and Wound-Healing : the Effect of a Catalase Inhibitor.
Bajji, M.; Gastiny, F.; du Jardin, Patrick ULg

in Acta Horticulturae (2005), 684

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See detailPotato tubers exhibit both homolytic and heterolytic hydroperoxide fatty acid cleaving activities
Fauconnier, Marie-Laure ULg; Delcarte, J.; Hoyaux, P. et al

Poster (2000, July 23)

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See detailPotato tubers exhibit both homolytic and heterolytic hydroperoxide fatty acid-cleaving activities
Fauconnier, Marie-Laure ULg; Delcarte, J.; Hoyaux, P. et al

in Biochemical Society Transactions (2000), 28(6), 853-855

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See detailPotencial de Agroecologia para a transicao
Stassart, Pierre M ULg

Scientific conference (2011)

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See detailThe Potent Angioinhibin Agm-1470 Stimulates Normal but Not Human Tumoral Lymphocytes
Antoine, Nadine ULg; Daukandt, M.; Locigno, R. et al

in Tumori (1996), 82(1, Jan-Feb), 27-30

BACKGROUND: AGM-1470 is a newly synthesized molecule developed as an analog of the potent anti-angiogenic fumagillin. Its efficacy in restraining tumor growth in vivo and the absence of major side effects ... [more ▼]

BACKGROUND: AGM-1470 is a newly synthesized molecule developed as an analog of the potent anti-angiogenic fumagillin. Its efficacy in restraining tumor growth in vivo and the absence of major side effects have already led to phase I clinical trials in patients with solid cancers. However, neither the exact mechanisms of action of AGM-1470 nor its effects on the host of normal cells have been extensively studied. Recently, we showed that AGM-1470 enhanced the proliferation of B lymphocytes in the presence of T cells. Since AGM-1470 could potentially be used in patients with lymphoma, it was urgent to test the effect of the molecule on the proliferation of tumor lymphocytes. METHODS: The possible effect of AGM-1470 on the proliferation of normal or tumor lymphocytes was evaluated by thymidine-incorporated assays. Normal T and B lymphocytes were purified from human tonsils. The tumor lymphocytes used in the study were Molt 3, Molt 4 and Jurkatt cell lines for the T lineage and Daudi and Radji cell lines for the B lineage. RESULTS: As shown previously, AGM-1470 stimulates the proliferation of normal B lymphocytes through an action on normal T cells. THe angioinhibin was ineffective ont eh proliferation of both T and B transformed cells. Moreover, in the presence of the drug, tumor T cells co-cultured with normal B lymphocytes did not induce any increase in B cell proliferation, as previously observed with normal T lymphocytes. Inversely, tumor B cells co-cultured with normal T lymphocytes were insensitive to the drug. CONCLUSIONS: Our results demonstrate that AGM-1470 is ineffective on lymphoid tumor cell proliferation and could potentially be safely administered to lymphoma patients. [less ▲]

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See detailA potent diazoxide analogue activating ATP-sensitive K+ channels and inhibiting insulin release
Antoine, M. H.; Arkhammar, P.; Nguyen, Q. A. et al

Poster (2000, September)

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See detailA potent diazoxide analogue activating ATP-sensitive K+ channels and inhibiting insulin release
Lebrun, P.; Arkhammar, P.; Antoine, M.-H. et al

in Diabetologia (2000), 43

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See detailPotent inhibition of genital herpesvirus infection in goats by cidofovir
Tempesta, Maria; Camero, Michele; Bellacicco, Anna Lucia et al

in Antiviral Therapy (2007), 12(6), 977-979

Background: Like human herpesvirus 2 (HHV-2) in humans, infection by caprine herpesvirus 1 in goats is associated with genital lesions, and this provides a unique model to study the efficacy and effects ... [more ▼]

Background: Like human herpesvirus 2 (HHV-2) in humans, infection by caprine herpesvirus 1 in goats is associated with genital lesions, and this provides a unique model to study the efficacy and effects of anti-herpetic drugs. Methods: The antiviral activity of cidofovir was assessed in goats infected experimentally, using various therapeutic protocols. Results: Topic administration of cidofovir 1% cream prevented the onset of virus-induced genital lesions and drastically reduced virus shedding. Conclusion: Cidofovir appears to be a very efficient drug for the prevention of genital lesions caused by an alphaherpesvirus. [less ▲]

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See detailPotential and requirement of the interactive web-based decision support system « Proculture » for field specific Mycosphaerella graminicola control in winter wheat
Maraite, Henri; Moreau, Jean-Marc; Calay, Frédéric et al

Conference (2004, May 11)

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