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Artykuły w czasopismach na temat "Bactéries persistantes"
Casselyn, Marina. "Du sucre contre les bactéries persistantes". Revue Médicale Suisse 7, nr 297 (2011): 1229. http://dx.doi.org/10.53738/revmed.2011.7.297.1229.
Pełny tekst źródłaBertholom, Chantal. "Bactéries méconnues d’urétrite persistante". Option/Bio 32, nr 631-632 (kwiecień 2021): 23. http://dx.doi.org/10.1016/s0992-5945(21)00078-7.
Pełny tekst źródłaCHAMOUX, A., C. PLOTTON i X. GOCKO. "Modèles explicatifs des patients souffrant de Lyme chronique". EXERCER 31, nr 163 (1.05.2020): 196–201. http://dx.doi.org/10.56746/exercer.2020.163.196.
Pełny tekst źródłaCattoen, C. "Persistance du portage de bactéries multirésistantes après la réanimation". Réanimation 24, nr 3 (12.03.2015): 249–55. http://dx.doi.org/10.1007/s13546-015-1048-4.
Pełny tekst źródłaLabanowski, J., E. Laurent, T. Chonova, A. Bouchez, B. Cournoyer, L. Marjolet, R. Marti i L. Mondamert. "Rejets d’effluents hospitaliers : évaluation de la persistance environnementale des médicaments et des bactéries pathogènes". Techniques Sciences Méthodes, nr 6 (czerwiec 2016): 22–30. http://dx.doi.org/10.1051/tsm/201606022.
Pełny tekst źródłaSophie EDOUARD, Emmanouil ANGELAKIS i Bernard LA SCOLA. "SÉROLOGIE BACTÉRIENNE". ACTUALITES PERMANENTES EN MICROBIOLOGIE CLINIQUE 18, nr 02 (1.06.2019): 12. http://dx.doi.org/10.54695/apmc.18.02.1513.
Pełny tekst źródłaMandi, L., J. Darley, J. Barbe i B. Baleux. "Essais d'épuration des eaux usées de Marrakech par la jacinthe d'eau (Charges organique, bactérienne et parasitologique)". Revue des sciences de l'eau 5, nr 3 (12.04.2005): 313–33. http://dx.doi.org/10.7202/705134ar.
Pełny tekst źródłaPayment, P., i P. Hartemann. "Les contaminants de l'eau et leurs effets sur la santé". Revue des sciences de l'eau 11 (12.04.2005): 199–210. http://dx.doi.org/10.7202/705338ar.
Pełny tekst źródłaRozprawy doktorskie na temat "Bactéries persistantes"
Fang, Gang. "Gènes persistants dans les génomes bactériens". Evry-Val d'Essonne, 2006. http://www.theses.fr/2006EVRY0013.
Pełny tekst źródłaPersistent genes are genes present in almost every organism within a group. They are the genes endeavoured through natural selections and widely spread. Persistent genes include most of experimentally essential genes. Furthermore, it also includes genes without immediate lethal effects but allowing to respond to a variety of unfavourable situations. Persistent genes evolve slowly and usually in parallel with the 16S rDNA. They are very sensitive to the head-on collisions between RNA polymerase and DNA polymerase, and consequently have a strong preference for the leading strand. They tend to use optimal codons to ensure efficient expression. To avoid the frequent gene loss, persistent genes are clustered, and such local clusters are usually groups of genes executing coupled functions. By assembling the persistent genes clusters together, a network representing the core bacterial proteome is built up. This network highlights the influences from environment in shaping bacterial proteome composition. Two examples applying evolutionary profiles comparison in genome annotation are presented, as well as a platform to carry out comparative genomics
Perfettini, Jean-Luc. "Modulation de l'apoptose au cours de l'infection par la bactérie intracellulaire stricte, Chlamydia". Paris 7, 2002. http://www.theses.fr/2002PA077145.
Pełny tekst źródłaCamiade, Mathilde. "Persistance de bactéries entériques antibiorésistantes ou pathogénes sur des végétaux de consommation humaine ( modèle la laitue )". Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR032/document.
Pełny tekst źródłaIn recent years, foodborne diseases caused by fresh products contaminated, such as lettuce, with enteric pathogenic bacteria (Salmonella, Shigatoxin-producing Escherichia coli-or STEC-) increasingly. The presence of these bacteria in this unusual environment is a major emerging health risk, especially since enteric bacteria, whether pathogenic or not, are frequently resistant to antibiotics. To study the persistence of antibiotic-resistant or pathogenic bacteria on lettuce, the characterization of resistance plasmids carried by E. coli strains from contaminated aquatic environments was carried out in order to study their potential involvement in adhesion of host strains on different varieties of lettuce. The study of the survival and adhesion of environmental and laboratory E. coli strains, transformed with the plasmids of interest, on young lettuce plants allowed to highlight three points: 1) more time contact between bacteria and leaves increases and less bacterial survival is important; 2) there is a difference in survival and adhesion depending on the varieties of lettuce studied; 3) there is a difference in survival and adhesion between laboratory strains and environmental strains, the latter being in better metabolic state and showing greater adhesion during the 11-12 days of experimentation. After the persistence of antibiotic-resistant E. coli strains under controlled conditions, field studies on 4 Normandy vegetable farms, with different technical itineraries, were carried out. The search for enteric pathogens, Salmonella and STEC, was carried out on lettuce and a search for E. coli, a control of fecal contamination, was realized on the lettuce as well as in the irrigation water of one of the sites. The results reveal a satisfactory microbiological quality of the agricultural plots studied (according to the European decree N ° 2073/2005) although E. coli strains were regularly found at the lettuce level, including some antibiotic resistant. Analysis of the irrigation water showed the continued presence of E. coli strains, including strains with common antimicrobial resistance profiles to those found on lettuce, showing that irrigation water is one of the critical sources of plant contamination in the field
Hajaij, Myriam. "L' entomophathogène Bacillus thuringiensis : identification d'un nouveau sérovar, persistance des spores et implication des métalloprotéases dans le pouvoir pathogène". Paris 7, 2005. http://www.theses.fr/2005PA077219.
Pełny tekst źródłaBacillus muringiensis is a Gram-positive spore-forming bacterium closely related to Bacillus cereus and both are ubiquitous to various environments. The entomopathogenic properties of B. Thuringiensis are mainly due to the δ-endotoxines. In the search for new B. Thuringiensis Cry toxins, we have isolated and characterized the new serovar H-71, named B. Thuringiensis serovar, jordanica. In a second aspect, we studied the possible impact of large scale treatments with a spore/crystal formulation (VectoBac®) of B. Thuringiensis serovar. Israelensis (Bti) in a mosquito breeding site in Grande Camargue (France). Genes encoding two putative zinc-metalloproteases of type InhA and Enhancin were found in a sequenced genome of B. Cereus strain ATCC14579. Then, our work has been based on purification, biochemical charaeterization and contribution of MiA2 in the virulence de B. Thuringiensis. . We show that InhA2 hydrolyses several substrates, like caseine, collagen, actin and albumine. Pure InhA2 dœs not provide direct mortality by oral route; meanwhile, it seems to interact with insect innate immunity. In addition it also dégrades cecropin, an anti-microbial peptide. We also investigated on a second metalloprotéase, encoded by a gene we named mpbE (Metalloprotease Bacillus Enhancin). We demonstrate its positive activation by the transcriptional regulator PlçR. MpbE carry a typical HEIAH signature
Naviner, Magali. "Émergence et persistance de bactéries résistantes en élevage de truites arc-en-ciel (Oncorhynchus mykiss) soumises à un traitement antimicrobien". Nantes, 2007. http://www.theses.fr/2007NANT2063.
Pełny tekst źródłaThe goal of this study was to address the outcome of the use of the quinolone antibacterials oxolinic acid (OA) or flumequine for the treatment of rainbow trout, on resistance evolution of indicator bacteria isolated from fish and from the inner environment of fish farms, and on the possible contamination by resistant bacteria of fish products destined to human consumption. It appeared that Aeromonas spp. Were pertinent indicators for the survey of antibacterial resistance within the microbiota of trout and of their close environment, due to the ease of their isolation and to the wide diversity of antibacterial susceptibility patterns that they exhibit. However, due to important quantitative seasonal variations of these bacteria in the intestine of trout, their usefulness as indicator appeared lower for the survey of resistance in this compartment. A dosage effect of OA treatments was observed, in experimental conditions, on the Aeromonas from fish tanks output water. Both the prevalence and the level of resistance of OA-resistant Aeromonas (associated with the presence of mutations in the gyrA and parC genes) were positively correlated with OA dosage. In the real conditions of a fish farm, we also observed during and after a flumequine treatment, an increase of the prevalence of OA-resistant Aeromonas in the ponds (water and biofilm) and in the trout (intestine and skin). Multiple antibacterial resistances were also observed in some Aeromonas spp. Selected by the quinolone treatments applied to fish, which raise the question of the risk to the environment (abundant presence of multiresistant bacteria in the fish farm effluents until at least two weeks after the end of the treatment) and to human health (detection of multiresistant bacteria on processed trout filets five weeks after the end of the treatment)
Carvalho, Gabriel. "Résilience aux antibiotiques de biofilms bactériens : concepts, modélisation et expérimentation". Thesis, Université Clermont Auvergne (2017-2020), 2017. http://www.theses.fr/2017CLFAC068/document.
Pełny tekst źródłaBacterial systems are complex and adaptive. When faced with disturbances, such as antibiotic treatments, they survive, recover and evolve. This is particularly true for biofilms, which survive treatments that planktonic cells cannot overcome. The capacity of systems to recover their initial state, some of their functions or composition after a disturbance is called resilience. The resilience concept is often considered complementary to resistance in ecology. However, antibiotic resilience has received little attention compared to antibiotic resistance. One reason of this lack of interest comes from the fact that the resilience concept is often poorly defined and ambiguous. In this thesis, we firstly developed a conceptual framework of antibiotic resilience and applied this framework to the case of a bacterial population faced with antibiotics. This analysis highlighted the importance of the biological mechanism of bacterial persistence. This phenomenon is based on the formation of sub-populations of antibiotic tolerant cells, the persisters, which is influenced by environmental conditions. To relate persister formation to environmental conditions, we developed mathematical models of phenotypic switches between susceptible and persister cells and calibrated and tested them with experimental data. Lastly, we studied the influence of bacterial persistence on biofilm antibiotic resilience. For this purpose, we developed an individual-based model of biofilm with phenotypic switches between susceptible and persister cells. Different strategies of phenotypic switches were related to the dynamics of growth, survival and recovery of bacterial biofilms faced with antibiotic shocks. The setting up of experimentations to obtain data to compare to simulations is presented in the discussion of this thesis. Globally, this thesis contributes to the clarification of the concept of antibiotic resilience and to the understanding of bacterial persistence in biofilms. It gives new perspectives on the use of the resilience concept in clinical bacteriology and emphasizes the importance of the heterogeneity of bacterial populations in their capacity to face disturbances and evolve
Baranovsky, Sophie. "Circulation et persistance de pathogènes nosocomiaux multirésistants et hautement résistants émergents dans l’environnement hospitalier : complexité des unités de transmission". Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTG002.
Pełny tekst źródłaHealthcare-associated infections (HAI) are a major concern of Public Health because of their involvement in the global threat of antibiotic resistance, predicted to become the first cause of mortality in 2050 with about 10 million deaths a year. The high antibiotic consumption associated with both patients’ promiscuity and vulnerability make hospital an ideal place for cross-transmission of bacteria, especially drug-resistant bacteria, and for outbreak occurrence. Surfaces within hospital environment play an important role in these phenomena, serving as reservoir or relay for bacteria responsible of HAI. Better understand the diffusion of bacteria responsible of HAI onto hospital surfaces appears as a major axe of research.In order to observe the circulation and persistence of gram-negative bacteria (GNB) involved in HAI onto hospital surfaces, and to identify the reasons of diffusion and outbreak successes of certain bacterial species and sub-species, we performed intensive samplings of hospital environment, with a total of 5329 surfaces sampled. Two sources of contamination were considered: the hydric origin with Pseudomonas aeruginosa in leading position, and the human origin with carbapenemase-producing bacteria (CPB).During this work, we collected 567 strains by sampling the hospital environment. For every strain, both clinical, ecological and epidemiological data were gathered. The strains collection isolated in real conditions of hospital activities is the foundation of this thesis and constitutes its originality. It permitted to retrace, as close as possible to real-life conditions, the routes of transmission of bacteria responsible of HAI on hospital surfaces. This allowed us to identify environmental reservoirs of GNB and analyze the circulation of hydric bacteria between water and water point-of-use, surfaces and patients, as well as the circulation of human bacteria between patients and hospital surfaces. These analyses integrated the different levels of complexity of bacteria through the diversity of bacterial population and sub-populations. Considering this complexity as a whole seems to be the key to better understand the involvement of hospital environment in the transmission of bacteria responsible of HAI. Furthermore, we demonstrated that the close environment of patients reflected the bacteria colonizing/infecting patients, while providing further information on its diversity. Thus, the patient within its healthcare environment must be considered as a unique entity of transmission in order to better anticipating the diffusion of bacteria in hospital environment and the occurrence of outbreaks
Chevalier, Stéphanie. "Inférence logique de réseaux booléens à partir de connaissances et d'observations de processus de différenciation cellulaire". Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG061.
Pełny tekst źródłaDynamic models are essential tools for exploring regulatory mechanisms in biology. This thesis was guided by the need expressed in oncology and developmental biology to automatically infer Boolean networks reproducing cellular differentiation processes.By considering observations and knowledge that the modelers have at their disposal, this thesis presents an approach that allows to model the richness of this cellular behavior by inferring all the compatible Boolean networks at that scale of the regulatory networks commonly considered in biology.To develop this method, three main contributions are presented.The first contribution is a formal framework of the properties of data collected to study cellular differentiation. This framework allows reasoning about the desired dynamic properties within Boolean networks to be consistent with this cellular behavior.The second contribution concerns the encoding of the model inference problem as a Boolean satisfiability problem whose solutions are the Boolean networks compatible with the biological data. For this, constraints on the dynamics of Boolean networks corresponding to the previously formalized properties have been implemented in logic programming.The last contribution was to apply to real biological problems the model inference method, named BoNesis, which was developed thanks to the constraints. These applications showed the benefit of inferring a set of models for the process analysis and illustrated the modeling methodology, from the preparation of biological data to the analysis of the inferred models
Delafont, Vincent. "Diversité et implication des amibes libres dans la survie et la persistance des mycobactéries non tuberculeuses au sein d'un réseau d'eau potable". Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2278/document.
Pełny tekst źródłaFree-living amoebae are unicellular eukaryotes whose ecology in drinking water networks remains poorly understood. They may represent a public health concern, because of their ability to favour the presence of potentially pathogenic bacteria, among which are mycobacteria.A sampling scheme based on Paris drinking water network allowed identifying the diversity of both freeliving amoebae and their bacterial microbiome, using ribosomal RNA targeted pyrosequencing. These analyses indicated the major presence of Acanthamoeba, Vermamoeba, Echinamoeba and Protacanthamoeba genera. The microbiome was highly diverse and dominated by Pseudomonas, Stenotrophomonas, Bradyrhizobium, Sphingomonas and Pseudoxanthomonas. The coupling of physicochemical parameters to this analysis allowed underlining the importance of water origin, temperature, pH and chlorine concentration in shaping amoebal populations. Also an original endosymbiosis between V. vermiformis and a bacterium of the TM6 phylum was described. Free-living amoebae were frequently co-isolated with mycobacteria in the water network, mainly M. llatzerense and M. chelonae species. Infection experiments on A. castellanii illustrated the capacity of these species to resist and grow in presence of amoebae. Through genomics and transcriptomics approaches, several virulence factors, conserved between M. llatzerense, M. chelonae and M. tuberculosis were identified, and found to be upregulated during infection experiments. These results suggest their involvement in mycobacterial resistance to amoebal predation.Altogether, this work helped to better understand the ecology of free-living amoebae and their microbiome in drinking water networks, as well as the role of free-living amoebae in the survival and persistence of mycobacteria in such environments
Kortebi, Mounia. "Caractérisation d’une phase de persistance intracellulaire du pathogène Listeria monocytogenes". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS477/document.
Pełny tekst źródłaListeria monocytogenes is a facultative intracellular pathogenic bacterium responsible for a serious disease, listeriosis. Although much work has been done to characterize the virulence mechanisms of this bacterium, there is little data on the mechanisms leading to the asymptomatic carriage of L. monocytogenes in mammalian hosts. One of these mechanisms could be a phase of intracellular persistence. During prolonged infections of human epithelial cells in culture, such as hepatocytes and trophoblast cells, L. monocytogenes changes its intracellular lifestyle. After the active phase of cell-to-cell spread, the bacteria stop polymerizing actin and become trapped in single-membrane vacuoles labeled with the endosomal protein LAMP1.The aim of my thesis was to characterize these "Listeria-Containing Vacuoles" (LisCVs). We have shown that LisCVs are acidic, partially degradative compartments, labeled by the lysosomal protease cathepsin D. Their formation coincides with the disappearance of actin polymerization factor ActA from the bacterial surface and the capture of actin-free cytosolic bacteria by cell membranes. In these compartments, bacterial growth is slowed; a subpopulation is resistant to stress and can survive beyond three days of infection. The use of gentamicin during the infection protocol is not responsible for the formation of LisCVs. However, this antibiotic allows selection of vacuolar bacteria, by specifically inhibiting the growth of cytosolic bacteria. The formation of LisCVs is not specific to laboratory strains. However, the efficacy of the phenomenon could diverge according to the sequence types of L. monocytogenes strains. Vacuolar bacteria have the ability to exit the vacuoles and return to a motile and replicative state during the subculture of infected cells. When expression of the actA gene remains inactive, as in ΔactA mutants, vacuolar Listeria forms persist in host cells in a viable but non-culturable (VBNC) state. These VBNC forms can be transmitted during host cell divisions. All these results reveal a new phase of persistence in the intracellular infectious process of L. monocytogenes during prolonged infections of a subset of epithelial cells. This property could contribute to asymptomatic carriage of this pathogen in epithelial tissues, extend the incubation period of listeriosis, and make bacteria tolerant to antibiotic therapy