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See detailEffect of temperature and water activity on spore germination and mycelial growth of three fungal biocontrol agents against water hyacinth (Eichhornia crassipes)
Dagno, Karim ULg; Lahlali, Rachid; Diourté, M. et al

in Journal of Applied Microbiology (2011), 110

The fungi were grown in vitro on plates containing potato dextrose agar medium at different aw values (glycerol being added to adjust the aw). The percentage of viable conidia and radial growth rate ... [more ▼]

The fungi were grown in vitro on plates containing potato dextrose agar medium at different aw values (glycerol being added to adjust the aw). The percentage of viable conidia and radial growth rate decreased with decreasing water activity. Statistical analysis showed a significant effect of aw, temperature and the aw temperature interaction on mycelial growth (P < 0Æ0001). Water activity emerged as the factor exerting the greatest influence. Differences were observed between the fungi tested, the C. malorum appearing more tolerant to low aw and the F. sacchari more tolerant to high temperature (35 C). Growth models predicting the combined effect of aw and temperature were developed and response surfaces generated, showing fairly good agreement with the experimental values. Conclusions: Our results confirm the previous finding that aw has a greater influence than temperature on fungal growth. Under most conditions, variation of environmental factors has a detrimental influence on the percentage of viable conidia and mycelial growth rate of fungal isolates. [less ▲]

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See detailEffect of Temperature and Water Restriction On Piper aduncum L. Seed Germination
Silva, MHL; Costa, RCL; Lobato, AKS et al

in Journal of Agronomy (2007), 6(3), 472-475

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See detailEffect of temperature increase on the courtship behavior and the fitness in the Palmate newt
Galloy, Valérie ULg; Lo Presti, Wendy; Denoël, Mathieu ULg

Poster (2008)

A trend in global warming is now undeniable. Increases of global temperatures have resulted in measurable shifts in the distribution, phenology and survival of some plant and animal species. However, the ... [more ▼]

A trend in global warming is now undeniable. Increases of global temperatures have resulted in measurable shifts in the distribution, phenology and survival of some plant and animal species. However, the mechanisms showing the link between global warming and declines remain unclear. The aim of this study was to examine whether courtship displays and fitness could be affected by a temperature increase. To this end, we compared the sexual behavior and egg-laying traits at naturally occurring temperatures (14 C, 18 C and 22 C) in palmate newts (Triturus helveticus). First, our results underline the importance of female role in the male courtships. The majority of male behaviors are affected by the female responsiveness, which is temperature dependent. They also show that water temperature increase has a negative effect on the fecundity of female newts. Females lay half as many eggs at high temperatures as they do at low temperatures and of these only one third hatch. The demonstration of such a detrimental effect shows that more experimental studies are required to understand the proximate mechanisms of global warming. [less ▲]

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See detailEffect of Temperature on Growth of Psychrophilic and Psychrotrophic Members of Rhodotorula Aurantiaca
Sabri, Ahmed ULg; Jacques, Philippe; Weekers, Frederic et al

in Applied Biochemistry and Biotechnology (2000), 84-86(Spring), 391-9

The thermo-dependence of growth kinetic parameters was investigated for the Antarctic psychrophilic strain Rhodotorula aurantiaca and a psychrotrophic strain of the same species isolated in Belgium ... [more ▼]

The thermo-dependence of growth kinetic parameters was investigated for the Antarctic psychrophilic strain Rhodotorula aurantiaca and a psychrotrophic strain of the same species isolated in Belgium (Ardennes area). Cell production, maximum growth rate (mu max), and half-saturation constant for glucose uptake (Ks) of both yeasts were temperature dependent. For the two yeasts, a maximum cell production was observed at about 0 degree C, and cell production decreased when temperature increased. The mu max values for both strains increased with temperature up to a maximum of 10 degrees C for the psychrophilic strain and 17 degrees C for the psychrotrophic strain. For both yeasts, Ks for glucose was relatively constant at low temperatures. It increased at temperatures above 10 degrees C for the psychrophilic strain and 17 degrees C for the psychrotrophic strain. Although its glucose affinity was lower, the psychrotrophic strain grew more rapidly than the psychrophilic one. The difference in growth rate and substrate affinity was related to the origin of the strain and the adaptation strategy of R. aurantiaca to environmental conditions. [less ▲]

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See detailEffect of Temporal Changes in Bone Turnover on the Bone Mineralization Density Distribution: A Computer Simulation Study
Ruffoni, Davide ULg; Fratzl, Peter; Roschger, Paul et al

in JOURNAL OF BONE AND MINERAL RESEARCH (2008), 23(12), 1905-1914

The heterogeneous distribution of mineral content in trabecular bone reflects the continuous renewal of bone material in bone remodeling and the subsequent increase in mineral content in the newly formed ... [more ▼]

The heterogeneous distribution of mineral content in trabecular bone reflects the continuous renewal of bone material in bone remodeling and the subsequent increase in mineral content in the newly formed bone packets. The bone mineralization density distribution (BMDD) is typically used to describe this nonuniform mineral content of the bone matrix. Our mathematical model describes changes of the BMDD of trabecular bone as a function of bone resorption and deposition rates and the mineralization kinetics in a newly formed bone packet. Input parameters used in the simulations were taken from experimental studies. The simulations of the time evolution of the BMDD after increase in bone turnover (perimenopausal period) resulted in a shift of the BMDD toward lower values of the mineral content. Transiently, there was a broadening of the BMDD configuration partly showing two peaks, which points to a strongly heterogeneous distribution of the mineral. Conversely, when the remodeling rate was reduced (antiresorptive therapy), the BMDD shifted toward higher values of the mineral content. There was a transient narrowing of the distribution before broadening again to reach the new steady state. Results from this latter simulation are in good agreement with measurements of the BMDD of patients after 3 and 5 yr of treatment with risedronate. Based on available experimental data on bone remodeling, this model gives reliable predictions of changes in BMDD, an important factor of bone material quality. With the availability of medications with a known effect on bone turnover, this knowledge opens the possibility for therapeutic manipulation of the BMDD. [less ▲]

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See detailEffect of the 2003 heatwave on Eryngium alpinum demography under different management regimes
Bizoux, Jean-Philippe ULg; Andrello, Marco; Till-Bottraud, Irène

Conference (2011, September 28)

In the summer of 2003, Europe was impacted by an extreme heatwave that altered ecosystem productivity and increased plant mortality in natural areas. We analyse the effect of this extreme climatic event ... [more ▼]

In the summer of 2003, Europe was impacted by an extreme heatwave that altered ecosystem productivity and increased plant mortality in natural areas. We analyse the effect of this extreme climatic event on the demography of the protected alpine plant Eryngium alpinum in relation to local ecological conditions and management regimes (mowing, grazing and unmanaged). Spatiotemporal variation in the vital rates of different plant life-stages (seedlings, juveniles, vegetative and reproductive adults) was estimated in seven sites of E. alpinum in the French Alps between 2001 and 2010. The effects on population dynamics (deterministic and stochastic population growth rates, λ and a) were studied using matrix population models and life table response experiments. Reductions in survival rates were observed following the extreme 2003 summer. λ was smaller during the heatwave and a decreased in simulations where the occurrence probability of a 2003-like event was increased. Adult survival rates and fecundity were negatively affected by heavy spring grazing, leading to lower λ and a. There were few differences in population dynamics between mowed and unmanaged sites. While greater rates of heatwave occurrence did increase extinction probability, only heavily grazed sites showed considerable extinction risk. As a consequence, heavy spring grazing must be discouraged in sites where the conservation of E. alpinum is a priority, while it is important to quantify acceptable levels of grazing in semi-natural areas where plant conservation has to be achieved in accordance with human development needs. [less ▲]

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See detailEffect of the 585 Nm Flashlamp-Pumped Pulsed Dye Laser for the Treatment of Keloids
Paquet, Philippe ULg; Hermanns, Jean-François ULg; Pierard, Gérald ULg

in Dermatologic Surgery (2001), 27(2), 171-4

BACKGROUND: Due to its potential effects on skin microcirculation and collagen metabolism, the 585 nm flashlamp-pumped pulsed dye laser has been proposed for treating abnormal scars. Indeed, one of the ... [more ▼]

BACKGROUND: Due to its potential effects on skin microcirculation and collagen metabolism, the 585 nm flashlamp-pumped pulsed dye laser has been proposed for treating abnormal scars. Indeed, one of the main problems with keloidal scars is their disfiguring erythematous color. OBJECTIVE: To assess the efficacy of the 585 nm pulsed dye laser on the appearance of keloids. METHODS: Eleven patients with skin phototypes II-IV and keloids were treated with the 585 nm pulsed dye laser. After one to three treatment sessions, clinical assessments of the scars were performed in combination with remittance spectroscopy measurements of the redness and melanin pigmentation. A group of nine keloids covered by silicone gel sheeting served as controls. Data were compared statistically. RESULTS: During laser treatments, a discrete decrease in redness of the scars was clinically reported. However, this improvement was not confirmed by the objective spectrophotometric data. No side effects, especially hyperpigmentation, were disclosed. The keloids redness was not improved in the control group. CONCLUSION: The 585 nm pulsed dye laser yields only minimal effects, if any, on the erythema of keloids. Similarly silicone gel sheeting does not modify the keloids redness. [less ▲]

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See detailEffect of the activating agent on physico-chemical and electrical properties of activated carbon cloths developed from a novel cellulosic precursor
Ramos, ME; Bonelli, PR; Blacher, Silvia ULg et al

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2011), 378(1-3), 87-93

Different chemical reagents (phosphoric acid, boric acid, ammonium citrate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, disodium hydrogen phosphate and trisodium phosphate) were employed ... [more ▼]

Different chemical reagents (phosphoric acid, boric acid, ammonium citrate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, disodium hydrogen phosphate and trisodium phosphate) were employed to develop activated carbon cloths (ACC) by chemical activation of a lyocell precursor, in an attempt to explore their effect on main physico-chemical characteristics and electrical behaviour of the resulting ACC. The activating agent markedly influenced yield, elemental composition, and textural properties of the ACC. The ACC obtained with phosphoric and boric acids were essentially microporous, whereas those developed with the other reagents presented mesoporosity development. Phosphoric acid-derived samples showed the highest specific surface area (976 m2/g). The results also highlight the relevance of correcting the external surface adsorption in order to obtain reliable estimates of micropore volume. All the ACC were electrically conductive, their resistivity being also strongly dependent on the nature of the activating agent. The electrical resistivity of the ACC obtained with all the phosphorous compounds was successfully correlated with their C/H ratio and micropore volume [less ▲]

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See detailEffect of the addition of deffated date seeds on wheat dough performance and bread quality.
Bouaziz, M. A.; Besbes, Souhail; Blecker, Christophe ULg et al

in Journal of Texture Studies (2010), 41

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See detailEffect Of The Antibiotic Azithromycin On Thermotropic Behavior Of Dopc Or Dppc Bilayers
Fa, N.; Ronkart, Sébastien ULg; Schanck, A. et al

in Chemistry and Physics of Lipids (2006), 144(1),

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See detailEffect of the bacterial or fungal origin of exogenous xylanases supplemented to a wheat-based diet on performance of broiler chickens and nutrient digestibility of the diet
Vandeplas, Sabrina ULg; Dubois Dauphin, Robin ULg; Thonart, Philippe ULg et al

in Canadian Journal of Animal Science (2010), 90(2), 221-228

Two identical experiments were carried out to study the effects of four xylanases from bacterial or fungal origin supplemented to a wheat-based diet, on growth performance of broiler chickens and nutrient ... [more ▼]

Two identical experiments were carried out to study the effects of four xylanases from bacterial or fungal origin supplemented to a wheat-based diet, on growth performance of broiler chickens and nutrient digestibilities. Experimental treatments consisted of a control basal diet containing 600 g kg-1 wheat (C), and the basal diet supplemented with 0.1 g kg-1 Grindazyme G from Aspergillus niger (G), 0.1 g kg-1 Belfeed B1100MP from Bacillus subtilis (B), 0.1 g kg-1 Roxazyme G from Trichoderma viride (R), or 0.0125 g kg-1 of a xylanase from Aspergillus aculeatus (A). Each experimental diet was given to four groups of six chickens each. Growth performance and feed conversion ratio (FCR) were recorded weekly, from 7 to 21 d of age. In the second experiment, a digestion balance trial was performed from 27 to 31 d of age to evaluate the nitrogen-corrected apparent metabolizable energy (AMEn) and the digestibilities of nitrogen, crude fat, starch and crude fibre. From 7 to 21 d of age, xylanase supplementation led to increased final body weight and daily weight gain, by 3.7 and 4.5 % (P < 0.05), respectively, without significant difference according to the xylanase origin. Xylanase supplementation significantly increased the AMEn (+2.6 %), and the digestibilities of crude fibre (+58.9 %) and nitrogen (+1.6 %). Increase in AMEn as well as in crude fat and starch digestibilities were significantly different according to the xylanase, but were not dependent on fungal or bacterial origin. In conclusion, the microbial origin of xylanases supplemented to wheat-based diets influenced neither the performance of broiler chickens nor the improvement in nutrient digestibilities [less ▲]

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See detailEffect of the carbohydrate fractions of pea seeds on the endogenous amino acid flow at the ileum of the pig.
Leterme, Pascal; Van Leeuwen, Piet; Thewis, André ULg et al

in Proceeding of the 6th International Symposium on Digestive Physiology in Pigs, n°80. (1994, October)

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See detailEffect of the combination of seed priming and Trichoderma treatment on incidence of damping-off agents.
Jacqmin, B.; Cotes, A. M.; Lepoivre, Philippe ULg et al

in Mededelingen van de Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen (Rijksuniversiteit te Gent) (1993), 58(3b),

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See detailEffect of the content of partially hydrogenated oils on the physical and structural properties of bakery margarines
Cavillot, V; Danthine, Sabine ULg; Kervyn de meerendré, M. et al

Poster (2008)

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See detailEFFECT OF THE COPOLYMERS SEMO B86 Y SEMO B124 ON DYNAMIC VISCOELASTICITY AND AGGREGATION ABILITY OF HUMAN ERYTHROCYTES
Danieli, V; Fontana, A; Alessi, A et al

in Anales de la Asociación Argentina de Física (2007), 19

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See detailEffect of the counter-ion of the basification agent on the pore texture of organic and carbon xerogels
Job, Nathalie ULg; Gommes, Cédric ULg; Pirard, René ULg et al

in Journal of Non-Crystalline Solids (2008), 354(40-41), 4698-4701

Organic and carbon xerogels were prepared by polycondensation of resorcinol with formaldehyde in water, followed by evaporative drying and, eventually, pyrolysis. The pH of the precursor's solution was ... [more ▼]

Organic and carbon xerogels were prepared by polycondensation of resorcinol with formaldehyde in water, followed by evaporative drying and, eventually, pyrolysis. The pH of the precursor's solution was fixed at 6.0 in all cases by adding various hydroxides as basification agent. Three alkali metal hydroxides (LiOH, NaOH and KOH) and three alkaline earth metals hydroxides (Ca(OH)(2), Ba(OH)(2), Sr(OH)(2)) were used. It was found that the pore texture of the organic and carbon xerogels is totally independent on the cation size, but depends on the charge and concentration of the counter-cation. Indeed, the pore size of the alkaline earth metal loaded samples is larger than that of the alkali metal-doped xerogels. As a matter of fact, to reach the same initial pH, the concentration in alkali metal hydroxide must be twice that of the alkaline earth metal base. The effect of ions on the pore texture was thus attributed to electrostatic effects on the microphase separation process that occurs prior to gelation. (C) 2008 Elsevier B.V. All rights reserved. [less ▲]

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See detailEffect of the double-muscled conformation selection on the cardiovascular function in cattle
Amory, Hélène ULg; Desmecht, Daniel ULg; Linden, Annick ULg et al

in Archives Internationales de Physiologie et de Biochimie (1992)

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