References of "Delvigne, Frank"
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See detailIntegrating metabolic modeling and population heterogeneity analysis into optimizing recombinant protein production by Komagataella (Pichia) pastoris
Theron, Chrispian ULiege; Berrios, J.; Delvigne, Frank ULiege et al

in Applied Microbiology and Biotechnology (2018), 102(1), 63-80

The methylotrophic yeast Komagataella (Pichia) pastoris has become one of the most utilized cell factories for the production of recombinant proteins over the last three decades. This success story is ... [more ▼]

The methylotrophic yeast Komagataella (Pichia) pastoris has become one of the most utilized cell factories for the production of recombinant proteins over the last three decades. This success story is linked to its specific physiological traits, i.e., the ability to grow at high cell density in inexpensive culture medium and to secrete proteins at high yield. Exploiting methanol metabolism is at the core of most P. pastoris-based processes but comes with its own challenges. Co-feeding cultures with glycerol/sorbitol and methanol is a promising approach, which can benefit from improved understanding and prediction of metabolic response. The development of profitable processes relies on the construction and selection of efficient producing strains from less efficient ones but also depends on the ability to master the bioreactor process itself. More specifically, how a bioreactor processes could be monitored and controlled to obtain high yield of production. In this review, new perspectives are detailed regarding a multi-faceted approach to recombinant protein production processes by P. pastoris; including gaining improved understanding of the metabolic pathways involved, accounting for variations in transcriptional and translational efficiency at the single cell level and efficient monitoring and control of methanol levels at the bioreactor level. © 2017, Springer-Verlag GmbH Germany, part of Springer Nature. [less ▲]

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See detailInvestigating the effects of hydrodynamics and mixing on mass transfer through the free-surface in stirred tank bioreactors
de Lamotte, Anne ULiege; Delafosse, Angélique ULiege; Calvo, Sébastien ULiege et al

in Chemical Engineering Science (2017), 172

In stirred-tank bioreactors, flow structures of various length and time scales are implied in scalar transport phenomena, such as gas species transfer through the liquid free-surface and their ... [more ▼]

In stirred-tank bioreactors, flow structures of various length and time scales are implied in scalar transport phenomena, such as gas species transfer through the liquid free-surface and their homogenization in the bulk. A proper understanding of the underlying mechanisms, i.e. hydrodynamics, mixing and mass transfer, and of their interactions is required to design and develop reliable and efficient production-scale bioprocesses. The objective of the present work is to experimentally investigate the coupling between gas-liquid mass transfer of oxygen with mixing efficiency and circulation patterns inside an arbitrarily chosen stirred-tank configuration aerated through the liquid free-surface, a baffled 20 L-vessel agitated by two Rushton turbines. Based on global parameter values, the most appropriate rotating speed, N = 300 rpm, is selected in order to further study local hydrodynamic quantities using Particle Image Velocimetry (PIV), as well as mixing and mass transfer dynamics using Planar Laser-Induced Fluorescence (PLIF). The results obtained with these local experimental methods are analyzed in detail. Their averages are first successfully compared to global data. Statistical analysis of their spatial distributions show that large-scale flow patterns significantly influence mass transfer through the free-surface of the stirred tank. Even if global measurements show that global characteristic times for mixing and mass transfer differ by two orders of magnitude, local experimental characterization shows persistent vertical gradients of dissolved gas concentrations. So the dissolved gas concentration is not as perfectly uniform as one might expect. [less ▲]

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See detailPhysico-chemical Approach for Characterising Probiotics: example of High Concentrated Multistrain-Based Formulation
Razafindralambo, Hary ULiege; Delvigne, Frank ULiege; Blecker, Christophe ULiege

Poster (2017, October 09)

Probiotics are receiving today unprecedented growing interests in Europe, Asia, and in the rest of the world. Their applications are not only limited to food and health sectors, but cover also agriculture ... [more ▼]

Probiotics are receiving today unprecedented growing interests in Europe, Asia, and in the rest of the world. Their applications are not only limited to food and health sectors, but cover also agriculture and aquaculture areas. The quality of probiotic products depends on many factors such as, the properties of each individual strain and its proportion in mixed products, the viable probiotic dose, and other selective ingredients like prebiotics and protectant agents incorporated into the formulation. Several strategies are employed for ensuring high product qualities, which can be controlled by different methods and techniques. To date, the physico-chemical approach for characterizing and controlling probiotic qualities and performances appears very attractive, but less exploited. It particularly consists in characterizing probiotic products in terms of thermal, surface and colloidal properties, which could be correlated to probiotic viability and functionalities. In this communication, we report the efficiency of such an approach when applied to a high concentrated multistrain-based formulation which has been shown a metabolic variability impacting on the inflammatory response, depending on the production site. [less ▲]

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See detailMicrobial lipopeptide production and purification bioprocesses, current progress and future challenges
Coutte, F.; Lecouturier, D.; Dimitrov, K. et al

in Biotechnology Journal (2017), 12(7),

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See detailAn anticancer molecule stemming from a plant root produced in a bioreactor
Vassaux, Antoine; Tarayre, Cédric ULiege; Delvigne, Frank ULiege et al

Poster (2017, May 24)

Secondary metabolites produced by plants or their symbionts have already shown specific properties: anticancer, anti-inflammatory, antibacterial, antifungal effects, etc. Astin C is a non-ribosomal ... [more ▼]

Secondary metabolites produced by plants or their symbionts have already shown specific properties: anticancer, anti-inflammatory, antibacterial, antifungal effects, etc. Astin C is a non-ribosomal peptide (secondary metabolite) produced by the fungus Villosirosea asteris, endosymbiont of the medicinal plant Aster tataricus, which has shown an interesting anticancer activity. The current challenge is the production of the molecule on a large scale and in higher quantities, either from the original fungus through fermentation technologies, or by a heterologous yeast strain having integrated the genes involved in the astin C biosynthesis pathway. The purpose of this workshop is to highlight the implementation possibilities of a strain producing a metabolite of interest. [less ▲]

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See detailLooking for phosphate-accumulating bacteria in activated sludge processes : a multidisciplinary approach
Tarayre, Cédric ULiege; Charlier, Raphaëlle; Delepierre, Anissa ULiege et al

in Environmental Science and Pollution Research (2017)

Over the past decades, an increasing need in renewable resources has progressively appeared. This trend concerns not only fossil fuels but also mineral resources. Wastewater and sewage sludge contain ... [more ▼]

Over the past decades, an increasing need in renewable resources has progressively appeared. This trend concerns not only fossil fuels but also mineral resources. Wastewater and sewage sludge contain significant concentrations in phosphate and can be considered as a fertilizer source of the utmost importance. In wastewater treatment plants, the biological uptake of phosphate is performed by a specific microbiota: the phosphate-accumulating organisms. These microorganisms are recovered in sewage sludge. Here, we aimed to investigate the occurrence of phosphate accumulators in four wastewater treatment plants. A 16S metagenetic analysis identified the main bacterial phyla extracted from the aerobic treatment: α-Proteobacteria, β-Proteobacteria, and Sphingobacteria. An enrichment stage was performed to stimulate the specific growth of phosphate-accumulating bacteria in an acetate medium. An analysis of metabolic activities of sulfur and phosphorus highlighted strong modifications related to phosphorus and much less distinguishable effects with sulfur. A solid acetate medium containing 5-Br-4-Cl-3-indolyl phosphate was used to select potential phosphate-accumulating bacteria from the enriched consortia. The positive strains have been found to belong in the genera Acinetobacter, Corynebacterium, and Pseudomonas. Finally, electron microscopy was applied to the strains and allowed to confirm the presence of polyphosphate granules. Some of these bacteria contained granules the size of which exceeded 100 nm. [less ▲]

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See detailImpacts de champignons entomopathogènes sur la biologie et le comportement de la punaise diabolique (Hemiptera, Pentatomidae)
Fingu Mabola, Junior Corneille ULiege; Serteyn, Laurent ULiege; Bawin, Thomas ULiege et al

Poster (2016, October 22)

Halyomorpha halys Stål, la punaise diabolique, est une espèce invasive préoccupante en provenance d’Asie de l’Est. En moins de 15 années, elle a colonisé près de l’ensemble des Etats-Unis d’Amérique ... [more ▼]

Halyomorpha halys Stål, la punaise diabolique, est une espèce invasive préoccupante en provenance d’Asie de l’Est. En moins de 15 années, elle a colonisé près de l’ensemble des Etats-Unis d’Amérique, occasionnant des pertes de rendement considérables dans les vergers et les cultures en champs ainsi que des nuisances dans les habitations durant l’hiver. La punaise diabolique a été recensée en Suisse en 2007, et il est à craindre qu’elle colonise la presque totalité de l’Europe d’ici 2020. Cette étude a pour objectif de prévenir l’installation de la punaise diabolique dans les pays européens en se focalisant sur le contrôle biologique. Des scientifiques américains ont développé une stratégie « attirer et tuer » basée sur la phéromone d’agrégation de la punaise diabolique et des pesticides. D’autres ont montré l’efficacité d’un champignon pathogène d’insectes (Beauveria bassiana strain GHA. Afin d’établir un contrôle rapide du ravageur en Europe, compatible avec l’agriculture biologique, une idée serait de combiner l’effet attractif de la phéromone d’agrégation et l’application de spores de B. bassiana. Dans cette étude, l’impact du champignon sur la mortalité de l’insecte et son autodissémination sont évalués. [less ▲]

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See detailThe Effect of Nutrients on the Degradation of Hydrocarbons in Mangrove Ecosystems by Microorganisms
Semboung Lang, Firmin ULiege; Tarayre, Cédric ULiege; Destain, Jacqueline ULiege et al

in International Journal of Environmental Research (2016), 10(4), 583-592

Mangrove ecosystems are areas prone to various types of pollution, especially hydrocarbons. These hydrocarbons mostly stem from human activities such as spills coming from offshore oil operations, runoff ... [more ▼]

Mangrove ecosystems are areas prone to various types of pollution, especially hydrocarbons. These hydrocarbons mostly stem from human activities such as spills coming from offshore oil operations, runoff from surrounding urban areas or atmospheric deposition. This pollution causes the decline of mangroves, which results in an imbalance in the functioning of this particular ecosystem with damages to the microbiota. Biodegradation allows to restore these ecosystems. This biodegradation can only be effective in specific environmental conditions. The presence of nutrients, which stimulate bacterial growth and promote biodegradation, is a key parameter to be considered. During this experiment, we achieved biodegradation tests to assess the effect of nitrogen and phosphorus on the process. The results showed that the biodegradation rates were strongly bound to the presence of nutrients. The degradation rates depended on the medium. The treatment that reached the best rate of degradation of diesel after 10 days was the one using 20% of a nutrient solution (MSM) containing nitrogen and phosphorus. This treatment led to a maximal degradation of 84.7% ± 4.7% obtained in the flasks containing 20% of a nutrient solution (MSM) containing nitrogen and phosphorus. [less ▲]

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See detailSemi-continuous fermentation of a thermotolerant and high acetic acid producing Acetobacter pasteurianus bacterium
Mounir, Majid ULiege; Thonart, Philippe ULiege; Ismaili Alaoui, Mustapha et al

Conference (2016, September 14)

Among 63 strains isolated from fruits and homemade vinegars from different ecosystems of Morocco, a thermotolerant bacterium with high production of acetic acid was selected and evaluated for its ability ... [more ▼]

Among 63 strains isolated from fruits and homemade vinegars from different ecosystems of Morocco, a thermotolerant bacterium with high production of acetic acid was selected and evaluated for its ability to perform efficient acetous fermentation at high temperature in a bioreactor. CV01 strain, isolated from cactus (Opuntia ficus-indica), was considered to be an Acetobacter pasteurianus sp. according to phylogenetic study based on 16s rDNA gene sequence analysis. An optimal culture medium containing initial concentrations of acetic acid and ethanol of 1% (v/v) and 4% (v/v), respectively, was used. The growth kinetics of this isolate were monitored in flasks and compared with those of the wild type LMG 1625 mesophilic strain and the thermoresistant Acetobacter senegalensis reference strain. The CV01 strain exhibited abundant growth along with high amount of produced acetic acid at high temperature (41°C). Subsequently, a 20-L stirred tank bioreactor was used to assess thermotolerance and acidoresistance properties of the selected strain during semi-continuous acetic acid fermentation at 38°C. Interestingly, a total amount of 13.4% (w/v) acetic acid was yielded at the end of fermentation. Moreover, this bacterium could produce during the same fermentation process a final concentration of 11.2 g/L gluconic acid, a sensory quality indicator in vinegar production. Finally, the enzymatic study showed that CV01 strain exhibited high ADH and ALDH enzyme activity at 38°C compared with the mesophilic reference strain LMG 1632, which was significantly susceptible to thermal inactivation. [less ▲]

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See detailBiodegradation of Polycyclic Aromatic Hydrocarbons in Mangrove Sediments Under Different Strategies: Natural Attenuation, Biostimulation, and Bioaugmentation with Rhodococcus erythropolis T902.1
Semboung Lang, Firmin ULiege; Destain, Jacqueline ULiege; Delvigne, Frank ULiege et al

in Water, Air & Soil Pollution (2016)

Polycyclic aromatic hydrocarbons (PAHs) are pollutants that occur in mangrove sediments. Their removal by bacteria often depends on specific characteristics as the number of benzene rings they possess and ... [more ▼]

Polycyclic aromatic hydrocarbons (PAHs) are pollutants that occur in mangrove sediments. Their removal by bacteria often depends on specific characteristics as the number of benzene rings they possess and their solubility. Their removal also depends on environmental factors, such as pH, temperature, oxygen, and the ability of the endogenous or exogenous microflora to metabolize hydrocarbons.With the aim of treating mangrove sediments polluted by hydrocarbons in a biological way, a biodegradation experiment was conducted using mangrove sediments artificially contaminated with a mixture of four PAHs. The study used Rhodococcus erythropolis as an exogenous bacterial strain in order to assess the biodegradation of the PAH mixture by natural attenuation, biostimulation, bioaugmentation, and a combination of biostimulation and bioaugmentation. The results showed that the last three treatments were more efficient than natural attenuation. The biostimulation/bioaugmentation combination proved to be the most effective PAH degradation treatment. [less ▲]

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See detailBiofilm fermentation for the production of insect pathogenic fungi
Bawin, Thomas ULiege; Francis, Frédéric ULiege; Delvigne, Frank ULiege

Poster (2016, July 27)

Currently, integrated pest management that aims to reduce the use of synthetic insecticides by considering all appropriate alternative methods, is promoted. In that context, insect pathogenic fungi could ... [more ▼]

Currently, integrated pest management that aims to reduce the use of synthetic insecticides by considering all appropriate alternative methods, is promoted. In that context, insect pathogenic fungi could be developed as biopesticides in two ways: spores but also metabolites that are recognized as virulence factors. Targeting adequate fermentation method is an important requirement to obtain fungal products (i.e. spores, enzymes and metabolites) of biotechnological interest. The 'Microbial Processes and Interactions' laboratory has developed an innovative fermentation technology (referred to as ‘biofilm fermentation’) involving the growth of fungal biomass on inert supports that are immersed in a liquid nutrient medium. Confining fungal biomass on immersed inert structures provides a hybrid production system aiming to keep a solid-state physiology for sporulation and secretion of metabolites while controlling fermentation parameters. This research project proposes to transfer this technology to culture insect pathogenic fungi, such as Metarhizium anisopliae, for the production of spores and insecticidal metabolites. Development stages include the qualitative and quantitative characterization of its impact on insecticidal products as well as scale-up to industrial level. [less ▲]

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See detailImpacts of entomopathogenic fungi on biology and behaviour of the invasive Brown Marmorated Stink Bug (Hemiptera, Pentatomidae)
Fingu Mabola, Junior Corneille ULiege; Serteyn, Laurent ULiege; Bawin, Thomas ULiege et al

Poster (2016, July 25)

Halyomorpha halys St˚al (Hemiptera, Pentatomidae) is an invasive stink bug coming from Eastern Asia. Besides causing important yields losses in orchards, crop and vegetable fields, it overwinters inside ... [more ▼]

Halyomorpha halys St˚al (Hemiptera, Pentatomidae) is an invasive stink bug coming from Eastern Asia. Besides causing important yields losses in orchards, crop and vegetable fields, it overwinters inside houses as agglomerates of dozens. In Europe, this Brown Marmorated Stink Bug (BMSB) was accidentally introduced in Switzerland in 2007 and has been later observed in surrounding countries (France, Italy, Germany). Based on the current US situation, we can reasonably fear that BMSB will have colonized most of Europe countries in less than a decade. If we already discern a few fungus strains that are efficient against BMSB, very little is known about their actual impact on the insect itself. So we investigated the in- fluence of a fungal infection on insect development parameters and behaviour. Olfactometry was settled to investigate the dispersion and aggregation trends, while electropenetography was used to assess the feeding behaviour. Our results will be discussed to present changes according to healthy/fungus-infected status, in relation to potential biological control for that pest. [less ▲]

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See detailMaîtrise de la fermentation alcoolique sous stress éthanolique, thermique et osmotique de la souche Saccharomyces cerevisiae YSDN1 en vue de la préparation du vinaigre de fruits
Mounir, Majid ULiege; Belgrire, Malika; Lahnaoui, Safaa et al

in Revue Marocaine des Sciences Agronomiques et Veterinaires (2016), 4(2), 86-95

La présente étude a pour but d’isoler, d’identifier et de caractériser de nouvelles souches de levures d’intérêt industriel. Un total de 54 levures ont été isolées et identifiées à partir de produits ... [more ▼]

La présente étude a pour but d’isoler, d’identifier et de caractériser de nouvelles souches de levures d’intérêt industriel. Un total de 54 levures ont été isolées et identifiées à partir de produits agricoles brutes et de sous-produits de l’industrie agro-alimentaire. Parmi ces isolats, quatre souches ont été retenues, purifiées et testées pour leur performance de fermentation sur un jus de dattes de variété Bouslikhène. D’après le séquençage du gène 18S de l’ADN ribosomal, les deux souches YS-DN1 et YS-M isolées respectivement à partir des dattes et de la mélasse ont été identifiées appartenant à l’espèce Saccharomyces cerevisiae. Par ailleurs, les deux autres souches YS-OPM et YS-G isolées des olives et des raisins appartiennent respectivement aux espèces Kluyveromyces marxianus, avec 78% d’homologie et Candida utilis à 89% d’homologie. D’autre part, la souche YS-DN1, s’est identifiée comme la plus performante dans la production d’éthanol en comparaison à deux autres souches industrielles de référence. La levure YS-DN1 était l’unique souche capable de croitre à une température entre 35 et 40°C en présence d’un taux alcoolique élevé et une pression osmotique agressive. Finalement, la production de la biomasse cellulaire de la souche YS -DN1 a été améliorée par optimisation des facteurs température, Brix et pH fixés respectivement à 29.75°C, 15.7% et 4.15. Ces valeurs ont permis d’obtenir un maximum de cellules de l’ordre de 8.4x108 UFC/ml. Il a été conclu que cette souche pourrait bien s’adapter à des usages industriels pour la production du vinaigre de fruits à grande échelle. [less ▲]

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See detailOptimization of biomass production of Acetobacter pasteurianus KU710511 as a potential starter for fruit vinegar production
Mounir, Majid ULiege; Shafiei, Rasoul; Zarmehrkhorshid, Raziyeh ULiege et al

in African Journal of Biotechnology (2016), 15(27), 1429-1441

The objective of the present work was first the isolation of novel acetic acid bacteria strains from natural Moroccan habitats, and then, the evaluation of their ability to produce microbial starters for ... [more ▼]

The objective of the present work was first the isolation of novel acetic acid bacteria strains from natural Moroccan habitats, and then, the evaluation of their ability to produce microbial starters for vinegar production on a large scale. The strains were isolated from figs, dates, cactus, and traditional fruit vinegars. Four strains, selected from a total of 63 isolates, were confirmed as belonging to Acetobacter species according to biochemical and molecular studies based on 16s rRNA sequence analysis. Acetous fermentation tests, performed on date and apple fermented juices using selected Acetobacter strains, showed a high capacity of acidification. The most efficient strain KU710511, isolated from Morrocan cactus (Opuntia ficus-indica), was identified as Acetobacter strain closely related to A. pasteurianus and yielded 42.5 g/L acidity in apple juice. Cell growth optimization was carried out for KU710511 using response surface methodology (RSM). The linear, quadratic, and interaction effects of four factors—ethanol, acetic acid, glucose concentrations and pH—were studied by the application of a central composite design. Thirty experiments were designed to predict the maximum concentration of cell biomass. The optimal calculated values of ethanol, acetic acid, glucose and pH allowing the prediction of the maximum biomass production (2.21 g/L) were 28.18 g/L, 10.12 g/L, 15.15 g/L and 5.33, respectively. Subsequently, further batch fermentations were carried out in a 6-L lab-bioreactor at optimal and thermal stress conditions. The results were in line with the predicted values. It can be concluded that the studied strain is well suited to be used as a parental strain to prepare a starter for fruit vinegar production. [less ▲]

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See detailOn the α-polarization of bacterial suspensions: SIP measurements on four bacterial strains
Pilawski, Tamara ULiege; Tappe, Wolfgang; Zimmermann, Egon et al

Poster (2016, June 06)

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See detailCharacterisation of Phosphate Accumulating Organisms and Techniques for Polyphosphate Detection: A Review
Tarayre, Cédric ULiege; Nguyen, Huu-Thanh; Brognaux, Alison ULiege et al

in Sensors (2016), 16(797), 1-14

Phosphate minerals have long been used for the production of phosphorus-based chemicals used in many economic sectors. However, these resources are not renewable and the natural phosphate stocks are ... [more ▼]

Phosphate minerals have long been used for the production of phosphorus-based chemicals used in many economic sectors. However, these resources are not renewable and the natural phosphate stocks are decreasing. In this context, the research of new phosphate sources has become necessary. Many types of wastes contain non-negligible phosphate concentrations, such as wastewater. In wastewater treatment plants, phosphorus is eliminated by physicochemical and/or biological techniques. In this latter case, a specific microbiota, phosphate accumulating organisms (PAOs), accumulates phosphate as polyphosphate. This molecule can be considered as an alternative phosphate source, and is directly extracted from wastewater generated by human activities. This review focuses on the techniques which can be applied to enrich and try to isolate these PAOs, and to detect the presence of polyphosphate in microbial cells. [less ▲]

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See detailModelling of the β-lactamase BlaP induction in Bacillus licheniformis
Dauvin, Marjorie ULiege; Raymackers, Alice ULiege; Delvigne, Frank ULiege et al

Poster (2016, May 24)

In bacteria, the production of a β-lactamase, an hydrolase specific to β-lactam antibiotics, may be constitutive or inducible. In Bacillus licheniformis 749/I the presence of a β-lactam in the external ... [more ▼]

In bacteria, the production of a β-lactamase, an hydrolase specific to β-lactam antibiotics, may be constitutive or inducible. In Bacillus licheniformis 749/I the presence of a β-lactam in the external media is detected by a protein relay producing an intracellular signal which leads to the induction of BlaP β-lactamase expression. The blaP gene is included in a divergeon along with blaI, coding for a cytoplasmic repressor, and blaR1, coding for a penicillin membrane receptor. Both, the acylation of the extracellular domain of BlaR1 by a β-lactam together with cellular stress due to the presence of the antibiotic outside the cell generate a dipeptide (coactivator) resulting from the peptidoglycan turnover that destabilizes BlaI repressor-DNA complex, leading to the expression of β-lactam resistance. [less ▲]

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See detailStudy of microbial phenotypic heterogeneity under bioprocess conditions using « single-cell » techniques
Delepierre, Anissa ULiege; Brognaux, Alison ULiege; Baert, Jonathan ULiege et al

Poster (2016, May 20)

Presentation of single-cell techniques in order to characterize microbial phenotypic heterogeneity: fluorescent labelling, biosensors, automated flow cytometry combined to proteomics approach.

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