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See detailPhytoplankton control: the role of in situ nutrient recycling?
Darchambeau, François ULg; Thys, Isabelle; Leporcq, Bruno et al

Poster (1999, August 25)

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See detailPhytoplankton ecology of Lake Kivu (Eastern Africa): biomass, production and elemental ratios
Sarmento, Hugo; Isumbisho, Mwapu; Stenuite, Stephan et al

Conference (2007, August 16)

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See detailPhytoplankton ecology of Lake Kivu (eastern Africa): biomass, production and elemental ratios
Darchambeau, François ULg; Sarmento, Hugo; Isumbisho, Mwapu et al

Scientific conference (2007, October 01)

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See detailPhytoplankton ecology of Lake Kivu (eastern Africa): biomass, production and elemental ratios
Sarmento, Hugo; Isumbisho, Mwapu; Stenuite, Stephan et al

in Verhandlungen der Internationalen Vereinigung für Theoretische und Angewandte Limnologie = Proceedings of the International Association of Theoretical and Applied Limnology (2009, January), 30(5), 709-713

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See detailPhytoplankton of Lake Kivu
Sarmento, Hugo; Darchambeau, François ULg; Descy, Jean-Pierre

in Descy, Jean-Pierre; Darchambeau, François; Schmid, Martin (Eds.) Lake Kivu, Limnology and Biogeochemistry of a Tropical Great Lake (2012)

This chapter reviews taxonomic composition, biomass, production and nutrient limitation of the phytoplankton of Lake Kivu. Present Lake Kivu phytoplankton is dominated by cyanobacteria – mainly ... [more ▼]

This chapter reviews taxonomic composition, biomass, production and nutrient limitation of the phytoplankton of Lake Kivu. Present Lake Kivu phytoplankton is dominated by cyanobacteria – mainly Synechococcus spp. and thin filaments of Planktolyngbya limnetica – and by pennate diatoms, among which Nitzschia bacata and Fragilaria danica are dominant. Seasonal shifts occur, with cyanobacteria developing more in the rainy season, and the diatoms in the dry season. Other groups present are cryptophytes, chrysophytes, chlorophytes and dinoflagellates. According to a survey conducted in the period 2002–2008, the composition of the phytoplankton assemblage was quasi homogeneous among lake basins. The mean euphotic depth varied between 17 and 20 m, and the increase in the ratio between mixed layer depth and euphotic depth to about 2 in the dry season may have selected for diatoms and cryptophytes, which tended to present their maximal development in this season, when cyanobacteria slightly decreased. Mean chlorophyll a concentration was 2.16 mg m−3, and the mean daily primary production was 0.62 g C m−2 day−1 (range, 0.14–1.92), i.e. in the same range as in other large oligotrophic East African Rift lakes. Seston elemental ratios indicated a moderate P deficiency during the dry, mixed season and a severe P limitation during part of the rainy, stratified season; the C:N ratio indicated a moderate N limitation throughout the year. Nutrient addition assays pointed to a direct N limitation and co-limitation by P during rainy seasons and P or N limitation during dry seasons depending on the year. Thus, phytoplankton ecology in Lake Kivu does not differ from that of other Rift lakes, where seasonal variations result in a trade-off between low light with high nutrient supply and high light with low nutrient supply. Phytoplankton production in Lake Kivu is also similar to that of other Rift lakes, and nutrient limitation of phytoplankton growth may occur as a result of variable availability of N and P, as in Lakes Tanganyika and Malawi, even though the extent of P limitation seems greater in Lake Kivu. [less ▲]

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See detailPhytoplankton of the River Loire, France: a biodiversity and modelling study
Descy, Jean-Pierre; Leitao, Maria; Everbecq, Etienne ULg et al

in Journal of Plankton Research (2011)

Most studies of phytoplankton dynamics in lowland rivers have been conducted in regulated rivers. This study deals the phytoplankton of the River Loire, a relatively unregulated river in Western Europe ... [more ▼]

Most studies of phytoplankton dynamics in lowland rivers have been conducted in regulated rivers. This study deals the phytoplankton of the River Loire, a relatively unregulated river in Western Europe, and aims at investigating the factors controlling phytoplankton composition and dynamics in this river. Phytoplankton biodiversity was assessed by pooling data from monthly sampling for 8 years at different sites. A correspondence analysis showed temporal and longitudinal gradients, with a dominance of small centric diatoms and green algae for most of the year, in the middle and lower river sectors. Phytoplankton dynamics were further explored using the POTAMON simulation model, run for the year 2005. The simulations, in agreement with the observations, confirmed the virtual absence of a Stephanodiscus spring peak, and reproduced well the development of small centric diatoms and green algae. Production and loss rates calculated by the model helped us to explain the dynamics of the three main phytoplankton categories, which attained high net production rates due to the low river depth (∼1 m at low discharge), but were subject to high sedimentation losses. Model calculations also showed that P limitation was likely, particularly for green algae, with a reduction of growth rate of up to 35%. In addition, the simulations showed a significant impact of the invasive Asian clam, Corbicula spp., on phytoplankton biomass. This study shows that the factors determining phytoplankton diversity and dynamics in this unregulated river are basically the same as those identified in other lowland rivers, but that key factors are habitat diversity and variation of water level in the river channel. [less ▲]

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See detailPhytoplankton, bacteria and viruses: sources of CDOM in experimental mesocosms maintained under different pCO2 levels
Rochelle-Newall, E.; Delille, Bruno ULg; Gattuso, J.-P. et al

Poster (2003, April)

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See detailPhytoremediation of contaminated sites in urban environment : preliminary results of a study focussed on Lubumbashi.
Colinet, Gilles ULg; Saad, Layla ULg; Cubaka, Alfred et al

Conference (2007, July)

A specific flora has developped in Central Africa on soils which are naturally rich in Cu and Co. Mining and ore treatment activities in the Katanga province (RDC) have generated contaminations which do ... [more ▼]

A specific flora has developped in Central Africa on soils which are naturally rich in Cu and Co. Mining and ore treatment activities in the Katanga province (RDC) have generated contaminations which do endanger ecosystem viability and/or human health. A survey of edaphic conditions prevailing for plant growing in natural metalliferous outcrops, the « copper hills », in mining sites (quarries), and in contaminated areas around metal smelters, is conducted as a first stage of a phytoremediation-based research program. Soluble, available and total content in some metallic trace elements have been measured. The first results show a relatively high heterogeneity inside and between sites. But the main finding is related to the very different nature of contamination between the three types of sites. This point constitutes an additionnal difficulty that should be taken into account for the selection of metallophytic species from the copper hills or the quarries in order to vegetalize a site contaminated by atmospheric fall outs from metal smelters in Lubumbashi. [less ▲]

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See detailPhytoremediation of persistent organic pollutant in soils: study of the absorption mechanism in two cucurbitacean species and future applications
Campanella, Bruno ULg; Paul, Roger ULg

in Kaltsikes, P.J. (Ed.) Phytoremediation 2000 State of the art in Europe (2000, April 06)

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See detailPhytoremediation of polyaromatic hydrocarbons, anilines and phenols
Harvey, P. J.; Campanella, Bruno ULg; Castro, P. et al

in Environmental Science & Pollution Research (2002), 9

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See detailLa phytoremédiation par le saule
Evlard, Aricia ULg; Vanobberghen, Fanny; Campanella, Bruno ULg et al

in Forêt Wallonne (2011), 112(mai/juin), 36-46

En Wallonie, les sites potentiellement contaminés se comptent par milliers. La région subit aujourd’hui les conséquences de son manque historique de législations environnementales. Parmi les contaminants ... [more ▼]

En Wallonie, les sites potentiellement contaminés se comptent par milliers. La région subit aujourd’hui les conséquences de son manque historique de législations environnementales. Parmi les contaminants présents sur ces sites, les plus préoccupants sont certainement les métaux lourds qui s’accumulent dans le sol et menacent l’environnement. Pour remédier à ce problème, certains chercheurs s’intéressent particulièrement à la phytoremédiation, une technologie nouvelle qui exploite le potentiel des végétaux et de leur microflore associée pour extraire, stabiliser ou volatiliser ces métaux lourds. Cette technique biologique s’avère prometteuse et son application à l’aide de ligneux, comme le saule, serait une solution favorable à la préservation de la biodiversité et au développement des matériaux et des énergies renouvelables. [less ▲]

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See detailPhytoremediation to increase the degradation of PCBS and PCDD/Fs
Campanella, Bruno ULg; Bock, Claudia; Schröder, Peter

in Environmental Science & Pollution Research (2002), 9

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See detailPhytosanitary treatment of European pallets by microwave: developing a program to ensure compliance with ISPM 15 and monitoring its efficacy on the house longhorn beetle (Hylotrupes bajulus L.)
Henin, Jean-Marc; Leyman, Michael; Bauduin, Aline et al

in European Journal of Wood and Wood Products (2014)

Microwave heating was recently approved by the FAO as a significantly effective phytosanitary treatment for wood packaging material. According to ISPM 15 (FAO 2009), the target organisms are eradicated if ... [more ▼]

Microwave heating was recently approved by the FAO as a significantly effective phytosanitary treatment for wood packaging material. According to ISPM 15 (FAO 2009), the target organisms are eradicated if a temperature higher than 60 °C is maintained for 60 s across the entire profile of the board (i.e. 60 °C/60 s). A study using pallet boards was carried out in order to set up a treatment program that would meet ISPM 15 requirements in terms of wood temperature and insect mortality. A 4 m-long industrial tunnel oven (maximum power of 28.8 kW) was used to carry out the experiments. Temperature was measured by means of a VarioCAM® infrared camera. The most relevant results we found were: (i) achieving a temperature of 63.2 °C (Populus sp.) or 64.8 °C (Pinus sylvestris L.) on the upper surface of 22 mm-thick boards enabled compliance with FAO requirements (i.e. 60 °C/60 s), whatever the moisture content, basic density and initial temperature of the wood (provided the latter exceeded 0 °C); (ii) larvae >150 mg represented the most microwave-resistant life stage of Hylotrupes bajulus L.; (iii) the mortality rate of the larvae was influenced by the moisture content of the boards. Using the Gompertz model, we estimated the upper surface temperature that would be needed to achieve a 99.99683% mortality rate (the Probit 9 mortality level of efficacy) for the most microwave-resistant life stage of H. bajulus. This temperature was estimated to be 46.8 °C and 57 °C for wood with >50 and <25% moisture content, respectively. [less ▲]

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See detailPHYTOSTABILISATION OF COPPER-CONTAMINATED SOIL IN KATANGA: AN EXPERIMENT WITH THREE NATIVE GRASSES AND TWO AMENDMENTS
Ngoy Shutcha, Mylor; Mpundu Mubemba, Michel; Faucon, Michel-Pierre et al

in International Journal of Phytoremediation (2010), 12(6), 616-632

This study evaluates the feasibility of using the grass species Rendlia altera, Monocymbium ceresiiforme, Cynodon dactylon and amendments (compost and lime) for the phytostabilisation of soils ... [more ▼]

This study evaluates the feasibility of using the grass species Rendlia altera, Monocymbium ceresiiforme, Cynodon dactylon and amendments (compost and lime) for the phytostabilisation of soils contaminated by Cu in the province of Katanga (Democratic Republic of Congo). Species were grown on control and Cu-contaminated plots (artificially contaminated with 2,500 mg kg-1 Cu) unamended (NA), amended with 4.5 kg compost m-2 or 0.2 kg lime m-2. R. altera was also grown on contaminated plots amended with 22.5 kg compost m-2 or 1 kg lime m-2. Plant survival, growth and reproduction were monitored for two years. Cu-concentration in leaves of R. altera and M. ceresiiforme were analysed. pH and extractable Cu (0.01 M CaCl2) in soil were analysed in April 2007 and 2008. Results showed that R. altera seems to be the best candidate because of its highest survival on NA, followed by M. ceresiiforme, while liming was necessary to ensure survival of C. dactylon. Lime increased plant reproduction and reduced Cu accumulation in leaves compared to compost. However, higher survival and number of spikes of R. altera obtained in experiment 2 with 22.5 kg compost m-2 suggest that lime x compost interactions should be investigated in further studies. [less ▲]

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See detailPhytotechnie des céréales
Falisse, André; Seutin, E.; Crohain, A. et al

in Fumure et protection phytosanitaire des céréales (1990, February 22)

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See detailPhytotechnie des céréales
Falisse, André; Seutin, E.; Rixhon, L. et al

in Fumure et protection phytosanitaire des céréales (1989, February 23)

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See detailPhytotechnie des céréales
Nyst, Pierre; Monfort, Bruno; Cors, François et al

in Livre Blanc: Céréales - Gembloux (1988, February 25)

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See detailPhytotechnie des céréales
Falisse, André; Bodson, Bernard ULg; Nyst, Pierre et al

in Livre Blanc: Céréales - Gembloux (1987, February 26)

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See detailPhytotechnie des céréales: 1. Le semis, la fumure azotée, les variétés
Falisse, André; Poelaert, Jean; Bodson, Bernard ULg et al

in Livre Blanc: Céréales - Gembloux (1985, February)

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See detailPhytotechnie des céréales: 1. Le semis, la fumure azotée, les variétés
Falisse, André; Poelaert, Jean; Bodson, Bernard ULg et al

in Fumure et protection phytosanitaire des céréales (1984, February)

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