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See detailGrowth monitoring of Listeria monocytogenes and Salmonella spp. according to the packaging technique in pork minced meat
Adolphe, Ysabelle; Delhalle, Laurent; Jasick, A. et al

Poster (2010, September 16)

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See detailGrowth monitoring of Listeria monocytogenes and Salmonella spp. according to the packaging technique in pork minced meat
Adolphe, Ysabelle; Delhalle, Laurent; Jasick, A. et al

Poster (2010, June 09)

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See detailGrowth monitoring of Listeria monocytogenes and Salmonella spp. according to the packaging technique in pork minced meat
Adolphe, Y.; Delhalle, L.; Jasick, A. et al

Poster (2010, August)

A high level of protection of public health is one of the fundamental objectives of European food laws, as laid down in Regulation (EC) No 2073/2005. Listeria monocytogenes is a pathogen found within the ... [more ▼]

A high level of protection of public health is one of the fundamental objectives of European food laws, as laid down in Regulation (EC) No 2073/2005. Listeria monocytogenes is a pathogen found within the food-processing industries, mainly brought by human, and was responsible of 1,381 confirmed cases of foodborne listeriosis for 2008 in Europe. Salmonella was in 2008, the second most often reported zoonotic disease in humans, and 131,468 confirmed cases of human salmonellosis were reported in Europe. The aim of the present work was to develop and to validate a quicker and more sensitive genetic method for quantification of L. monocytogenes and Salmonella spp. in meat products by the quantitative real-time PCR. After preliminary tests for primers and probes choice, the genetic method was validated with classical microbial methods (ISO 11290-2:1998, ISO 6579) using challenge tests. A mixture of 3 strains was realized for each bacterial genus: 1 referee strain (L. monocytogenesT NTCT 11994 or S. TyphimuriumT ATCC 14028) and 2 lab isolates. Experiments were carried out on pork's irradiated and not irradiated minced meat. These meats were packaged either in expanded polystyrene trays wrapped with permeable stretch film or under modified atmosphere (70% O2/30% CO2) in sealed trays. The initial inoculum (102 cfu.g-1) was homogenized in minced meat before packaging in trays. They were incubated for 14 days, at +5, +8 and +10°C and at +10 and +12°C, for respectively L. monocytogenes and Salmonella spp. In the 2 tested meats, growth speeds as well as the final populations increased according to the temperature. In the not irradiated minced meat, growth speeds of the pathogenic flora as well as the associated final populations were lower than those observed in the irradiated matrices. As soon as the total flora reached its stable growth phase, growths of the various pathogenic stagnated. The growth of the original flora inhibited partially the growth of pathogens inoculated. Generally, growth of the total flora is partially inhibited by modified atmosphere packaging. The analytical methods of molecular biology allow faster and less heavy analyses, in terms of hand of work and execution, than the methods of classic microbiology. [less ▲]

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See detailGrowth of carbon nanotubes on metal nanoparticles: a microscopic mechanism from ab initio molecular dynamics simulations
Raty, Jean-Yves ULiege; Gygi, F.; Galli, G.

in Physical Review Letters (2005), 95(9), 0961031-09610340961034

We report on ab initio molecular dynamics simulations of the early stages of single-walled carbon nanotube (SWCNT) growth on metal nanoparticles. Our results show that a sp2 bonded cap is formed on an ... [more ▼]

We report on ab initio molecular dynamics simulations of the early stages of single-walled carbon nanotube (SWCNT) growth on metal nanoparticles. Our results show that a sp2 bonded cap is formed on an iron catalyst, following the diffusion of C atoms from hydrocarbon precursors on the nanoparticle surface. The weak adhesion between the cap and iron enables the graphene sheet to "float" on the curved surface, as additional C atoms covalently bonded to the catalyst "hold" the tube walls. Hence the SWCNT grows capped. At the nanoscale, we did not observe any tendency of C atoms to penetrate inside the catalyst, consistent with total energy calculations showing that alloying of Fe and C is very unlikely for 1 nm particles. Root growth was observed on Fe but not on Au, consistent with experiment [less ▲]

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See detailGrowth of Cayley and diluted Cayley trees with two kinds of entities
Vandewalle, Nicolas ULiege; Ausloos, Marcel ULiege

in Journal of Physics : A Mathematical & General (1996), 29(22), 7089-7104

A kinetic growth model derived from the magnetic Eden model is introduced in order to simulate the growth of hierarchical structures, such as Cayley trees. We only consider the case where two kinds of ... [more ▼]

A kinetic growth model derived from the magnetic Eden model is introduced in order to simulate the growth of hierarchical structures, such as Cayley trees. We only consider the case where two kinds of entities are competing with each other can be further subjected to an external field. The very relevant case in which both kinds of entities have different coordination numbers is introduced here for the first time, and is called the diluted Cayley tree. Physical and geometrical properties of the finite and infinite trees are exactly found and simulated. Finite-size effects are emphasized and illustrated on the global or local magnetization and on the chemical activity. Asymptotic limits are given in each case. The generated patterns can be related to a correlated percolation problem briefly discussed in the appendix. [less ▲]

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See detailGrowth of Chlorella in the presence of organic carbon: A photobioreactor study
Miazek, Krystian ULiege; Goffin, Dorothée ULiege; Richel, Aurore ULiege et al

Scientific conference (2014, June 19)

In this study, the effect of organic carbon supplementation at low light intensity on Chlorella sorokiniana growth was evaluated. Addition of 1 g/L of acetate to media gave the highest growth rate and ... [more ▼]

In this study, the effect of organic carbon supplementation at low light intensity on Chlorella sorokiniana growth was evaluated. Addition of 1 g/L of acetate to media gave the highest growth rate and provided stable high biomass culture during prolonged cultivation time. Glucose at 1 – 5 g/L also improved biomass growth rate, although stability of high biomass culture could not be achieved. Overall, the presence of organic carbon can considerably enhance Chlorella growth when low light intensity is applied. [less ▲]

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See detailGrowth of Chlorella in vanillin enriched medium
Miazek, Krystian ULiege; Goffin, Dorothée ULiege; Richel, Aurore ULiege

Poster (2013, August)

In this work the effect of different concentration of vanillin on the growth of Chlorella culture was evaluated. Two concentrations of vanillin: 60 mg/L and 300 mg/L in Bold Basal Medium (BBM) were tested ... [more ▼]

In this work the effect of different concentration of vanillin on the growth of Chlorella culture was evaluated. Two concentrations of vanillin: 60 mg/L and 300 mg/L in Bold Basal Medium (BBM) were tested and an inoculum from a two month Chlorella sp. (CCBA) culture was used. Vanillin at concentration of 60 mg/L showed to possess stimulating effect on Chlorella growth during 11 days of cultivation. Stimulation of Chlorella started on 3rd day of growth and was accompanied by 87% decrease of vanillin concentration within first 3 days of cultivation and its complete removal from growth media after 7 days. The acceleration of Chlorella growth in vanillin containing medium was detected due to biomass density, up to 1.2 times bigger than in the control culture, but also by measurement of chlorophyll content. Increased amount of chlorophyll content, up to 1.35 times higher than in control, was found between 4th and 11th day of cultivation. The response of Chlorella towards higher concentration of vanillin (300 mg/L) was different when compared to experiments where only 60 mg/L was used. During first 4 days of cultivation, strong inhibition of Chlorella exposed to 300 mg/L vanillin was observed and vanillin concentration maintained at the same initial concentration. During next days, a recovery effect occurred as biomass density and chlorophyll content gradually increased in comparison to the onset of growth and vanillin concentration decreased to 2 % of its initial value. Biomass density measured in Chlorella culture on 11th day was much higher than at the beginning of cultivation but still by 40% smaller than in control and by 50% smaller than in the culture growing in medium with 60 mg/L of vanillin. Chlorophyll content at the end of cultivation constituted 50% of control value and 35% of chlorophyll culture with 60 mg/L vanillin in medium. [less ▲]

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See detailGrowth of desferrioxamine deficient Streptomyces mutants through xenosiderophore piracy of airborne fungal contaminations
Arguelles Arias, Anthony ULiege; Lambert, Stephany; Martinet, Loïc et al

in FEMS Microbiology Ecology (2015)

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See detailGrowth of high quality InP layers in STI trenches on miscut Si (001) substrates
Wang, Gang; Leys, Maarten; Nguyen, Ngoc Duy ULiege et al

in Journal of Crystal Growth (2011), 315

In this work, we report the selective area epitaxial growth of high quality InP in shallow trench isolation (STI) structures on Si (0 0 1) substrates 6° miscut toward (1 1 1) using a thin Ge buffer layer ... [more ▼]

In this work, we report the selective area epitaxial growth of high quality InP in shallow trench isolation (STI) structures on Si (0 0 1) substrates 6° miscut toward (1 1 1) using a thin Ge buffer layer. We studied the impact of growth rates and steric hindrance effects on the nano-twin formation at the STI side walls. It was found that a too high growth rate induces more nano-twins in the layer and results in InP crystal distortion. The STI side wall tapering angle and the substrate miscut angle induced streric hindrance between the InP facets and the STI side walls also contribute to defect formation. In the [-1 1 0] orientated trenches, when the STI side wall tapering angle is larger than 10°, crystal distortion was observed while the substrate miscut angle has no significant impact on the InP defect formation. In the [-1 1 0] trenches, both the increased STI tapering angle and the substrate miscut angle induce high density of defects. With a small STI tapering angle and a thin Ge layer, we obtained extended defect free InP in the top region of the [1 1 0] trenches with aspect ratio larger than 2. [less ▲]

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See detailGrowth of III/V materials on large area silicon
Schineller, Bernd; Nguyen, Ngoc Duy ULiege; Heuken, Michael

in ECS Transactions (2010), 28

Continuous miniaturization has been at the heart of advances in modern semiconductor electronics. However, further scalability has seen its limits for conventional CMOS technology due to short channel ... [more ▼]

Continuous miniaturization has been at the heart of advances in modern semiconductor electronics. However, further scalability has seen its limits for conventional CMOS technology due to short channel effects. To further increase the performance for the 32 and 22 nm nodes, channel engineering introducing III-V materials may be necessary. Hence, epitaxial growth and processing strategies have to be developed which combine the high complexity of an MOCVD growth chamber with the requirements of the silicon industry. [less ▲]

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See detailGrowth of pulmonary artery after arterial switch operation for simple transposition of the great arteries.
Massin, M. M.; Nitsch, G. B.; Dabritz, S. et al

in European Journal of Pediatrics (1998), 157(2), 95-100

This retrospective study attempts to assess the size and growth pattern of the pulmonary artery about 1 year after neonatal arterial switch operation for simple transposition of the great arteries. Sixty ... [more ▼]

This retrospective study attempts to assess the size and growth pattern of the pulmonary artery about 1 year after neonatal arterial switch operation for simple transposition of the great arteries. Sixty-seven patients underwent cardiac catheterization, including catheterization of the right and left pulmonary arteries, and right ventricular angiography an average of 13.9 months after arterial switch operation. In 34 of these patients pre-operative right ventricular angiocardiograms were available. The diameter of the main pulmonary artery and that of its proximal right and left branches were measured. The values were compared to those of normal children matched for body surface area, taken from the literature and, for the branch values, related to the degree of branch stenosis and to the corresponding values, measured on pre-operative angiocardiograms. The cross-section of the main pulmonary artery after arterial switch operation with Lecompte manoeuvre becomes oval. The branches of the pulmonary artery are sometimes underdeveloped and this finding is related to branch stenosis. The ratio of the branch gradients is inversely proportional to the growth ratio of both branches while the pre- and postoperative Nakata indices are identical. CONCLUSION: The Lecompte manoeuvre induces a flattening of the main pulmonary artery with concomitant reduction of its cross-sectional area. There is also frequently trivial or rarely moderate branch pulmonary stenosis which is accompanied by growth retardation of the concerned branch. [less ▲]

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See detailGrowth of Straight InAs-on-GaAs Nanowire Heterostructures
Messing, Maria E; Wong-Leung, Jennifer; Zanolli, Zeila ULiege et al

in Nano Letters (2011), 11(9), 3899-3905

One of the main motivations for the great interest in semiconductor nanowires is the possibility of easily growing advanced heterostructures that might be difficult or even impossible to achieve in thin ... [more ▼]

One of the main motivations for the great interest in semiconductor nanowires is the possibility of easily growing advanced heterostructures that might be difficult or even impossible to achieve in thin films. For III␣V semiconductor nanowires, axial heterostructures with an interchange of the group III element typically grow straight in only one interface direction. In the case of InAs␣GaAs heterostructures, straight nanowire growth has been demonstrated for growth of GaAs on top of InAs, but so far never in the other direction. In this article, we demonstrate the growth of straight axial heterostructures of InAs on top of GaAs. The heterostructure interface is sharp and we observe a dependence on growth parameters closely related to crystal structure as well as a diameter dependence on straight nanowire growth. The results are discussed by means of accurate first principles calculations of the inter- facial energies. In addition, the role of the gold seed particle, the effect of its composition at different stages during growth, and its size are discussed in relation to the results observed. [less ▲]

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See detailGrowth of subtropical forests in Miocene Europe: The roles of carbon dioxide and Antarctic ice volume
Hamon, Noémie; Sepulchre, Pierre; Donnadieu, Yannick et al

in Geology (2012), 40

The middle Miocene is a crucial period for the evolution of apes, and it corresponds to their <br /><br />appearance in Europe. The dispersion of apes was made possible by tectonic changes and the <br ... [more ▼]

The middle Miocene is a crucial period for the evolution of apes, and it corresponds to their <br /><br />appearance in Europe. The dispersion of apes was made possible by tectonic changes and the <br /><br />expansion of their habitat, (sub-) tropical forest, in Europe. The context in which the middle <br /><br />Miocene climatic optimum occurred still lacks constraints in terms of atmospheric pCO2 and <br /><br />ice-sheet volume and extent. Using a coupled atmosphere-ocean general circulation model <br /><br />(GCM) and dynamic vegetation model, we investigated the sensitivity of Miocene climate and <br /><br />vegetation to pCO2 levels and Antarctic ice-sheet confi gurations. Our results indicate that <br /><br />higher than present pCO2 is necessary to simulate subtropical forest in Western and Central <br /><br />Europe during the middle Miocene, but that a threshold at high pCO2 makes subtropical <br /><br />forest partly collapse. Moreover, removing ice over Antarctica modifi es oceanic circulation <br /><br />and induces warmer and slightly wetter conditions in Europe, which are consistent with the <br /><br />expansion of subtropical forest. These results suggest that a small East Antarctic Ice Sheet <br /><br />(25% of present-day ice volume) together with higher than present pCO2 values are in better <br /><br />agreement with available European middle Miocene data. [less ▲]

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See detailThe Growth of the Skull Roof Plates in Arabosteus variabilis (Acanthothoraci, Placodermi) from the Early Devonian Jauf Formation (Saudi Arabia): Preliminary Results
Olive, Sébastien ULiege; Goujet, Daniel; Lelièvre, Hervé et al

in Paleontological Journal (2014), 48(9), 992-1002

The skull roof growth of Arabosteus variabilis (Acanthothoraci), from the Pragian-Early Emsian of Saudi Arabia is studied on the basis of well preserved growth lines on the dermal plates. A clear tendency ... [more ▼]

The skull roof growth of Arabosteus variabilis (Acanthothoraci), from the Pragian-Early Emsian of Saudi Arabia is studied on the basis of well preserved growth lines on the dermal plates. A clear tendency towards growth in length, i.e. allometry in length, can be observed for all studied skull roof plates of Arabosteus variabilis as well as for the skull roof in general. Each studied plate displays particular growth shaping the skull roof according to its position in the skull roof pattern, e.g., the preorbital plate controls the shape of the part of the orbit and the nuchal plate retains the relative proportions in the skull roof during growth. [less ▲]

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See detailGrowth partitioning within beech trees (Fagus sylvatica L.) varies in response to summer heat waves and related droughts
Latte, Nicolas ULiege; Lebourgeois, François; Claessens, Hugues ULiege

in Trees (2016), 30(1), 189-201

To characterize growth partitioning within the tree and its responses to climate, we studied 8 dominant beech trees (Fagus sylvatica L.) of a pure, even-aged 98-year-old stand in Belgium. We sampled 10 ... [more ▼]

To characterize growth partitioning within the tree and its responses to climate, we studied 8 dominant beech trees (Fagus sylvatica L.) of a pure, even-aged 98-year-old stand in Belgium. We sampled 10 disks along the stem from breast height to treetop and examined the inter-annual patterns of, and discrepancies between, ring-area and volume increments by performing detailed stem analysis and dendroecological investigations. Although the common inter-annual variation among all increment series was high, we observed increasing growth variability and climate sensitivity with height, leading to notable bole-crown discrepancies. Both the common inter-annual variation and bole-crown discrepancies were mainly driven by summer heat waves and related droughts of the previous year, and spring droughts of the current year. Despite these discrepancies, the radial growth at breast height can be considered a good estimate of the tree volume increment but not for the purpose of focusing on climatic effects of isolated years. Extreme climatic conditions increase the risk of inaccurate estimations. The results of the present study are discussed in relation to tree ecophysiology hypotheses. [less ▲]

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