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Artykuły w czasopismach na temat "Décontamination microbienne"
Murgier, J., J. F. Coste, E. Cavaignac, X. Bayle-Iniguez, P. Chiron, P. Bonnevialle i J. M. Laffosse. "Flore microbienne sur les smartphones dans un bloc opératoire de chirurgie orthopédique : étude avant et après décontamination". Revue de Chirurgie Orthopédique et Traumatologique 102, nr 8 (grudzień 2016): 774–78. http://dx.doi.org/10.1016/j.rcot.2016.10.102.
Pełny tekst źródłaBissong, M. E. A., i M. Moukou. "Mobile phones of hospital workers: a potential reservoir for the transmission of pathogenic bacteria". African Journal of Clinical and Experimental Microbiology 23, nr 4 (24.10.2022): 407–15. http://dx.doi.org/10.4314/ajcem.v23i4.9.
Pełny tekst źródłaRozprawy doktorskie na temat "Décontamination microbienne"
Guitard, Christine. "Décontamination digestive : intérêt, modalités, limites, suivi bactériologique". Paris 5, 1988. http://www.theses.fr/1988PA05P230.
Pełny tekst źródłaAndrianarison, Tahina Razanadraibe. "Traitement d'effluents urbains dans un système de 11 lagunes : décontamination microbienne et élimination de l'azote". Montpellier 2, 2006. http://www.theses.fr/2006MON20104.
Pełny tekst źródłaMuhammad, Omid H. "Élaboration d’un biofilm polybactérien artificiel comme modèle pour la décontamination endodontique". Thesis, Nice, 2016. http://www.theses.fr/2016NICE4022/document.
Pełny tekst źródłaManagement of infection is the key to a successful root canal treatment and development of a study model of endodontic biofilm which resemble structurally to its wild type counterpart seems crucial before any clinical application of different protocols. However, the in vitro reproduction of the root canal biofilm which consists of about 500 different bacterial species is very difficult. In laboratory MICORALIS (EA 7354) we were interested in conception of an artificial polybacterial. The bibliographical research allowed to choose S. salivarius, E. faecalis, F. nucleatum and P. gingivalis which are representatives of different groups of root canal biofilm colonizers. Following a series of periodic Scanning Electron Microscopies of samples and furthermore by help of FISH-Confocal imaging of 16S rRNA, we could prove the presence of these bacteria inside the biofilm structure and illustrate their distribution over the root canal system. In addition, it was possible also to confirm the maturation time needed to obtain the biofilm model, which is resistant enough to be used in vitro for endodontic disinfection investigation. After being characterized, we treated the model biofilm with different endodontic decontamination protocols
Farhat, Maha. "Étude de la survie des légionelles et de la dynamique des populations microbiennes des réseaux d'eau chaude : rôle des procédés de décontamination". Poitiers, 2009. http://theses.edel.univ-poitiers.fr/theses/2009/Farhat-Maha/2009-Farhat-Maha-These.pdf.
Pełny tekst źródłaLegionella is a Gram-negative bacterium identified in Legionnaires' outbreaks linked to contaminated hot water systems and cooling towers. In France, where this disease has been notifiable since 1987, over a thousand cases are reported per year among which 10 % are fatal. Legionella and other microorganisms are attached to the surface and associated together in an extracellular anionic polymer matrix called biofilm. Within this structure, Legionella is more protected from disinfection processes than those present in the aqueous phase. Therefore, our objectives were structured around three main parts: (1) to develop an analytical tool in order to evaluate the effectiveness of various anti-Legionella treatments in water and biofilm (2) to monitor the prokaryotic total flora evolution and Legionella in water and biofilm after heat shock (70 °C during 30 minutes) and chemical treatments (biocide combinated with biodispersant) and (3) to characterize Legionella diversity and its associated microbial flora dynamic (bacteria and eukarya) in biofilm after both treatments. A pilot scale 1 consisted of two hot water similar loops (control and test loops) was developed and contaminated by a natural biofilm of Legionella. Both treatments tested (heat and chemical) have had a transient effect. A return to the initial concentrations of culturable Legionella in water and in biofilm was observed one week after application of treatments. For the first time in such studies, the use of advanced molecular methods (sequencing, SSCP) has identified the diversity of Legionella (five of which four species are opportunistic pathogens) in biofilm sampled in hot water networks and the characterization of the microbial flora accompanying Legionella in this matrix (proteobacteria, amoebae, flagellates, fungi, Alveolata). This work brings together innovative elements in terms of tools to test the anti-Legionella, analytical methods and knowledge about the microbial consortium accompanying Legionella in the biofilm
Venditti, Danielle. "Sols industriels contaminés par les métaux : caractérisation biogéochimique, approche biomoléculaire de la diversité microbienne et faisabilité d'un traitement de dépollution". Nancy 1, 1998. http://www.theses.fr/1998NAN10325.
Pełny tekst źródłaKamgang, Youbi Georges. "Propriétés réactives en post-décharge temporelle des décharges électriques glissantes dans l’air humide : application à la dégradation de colorant azoïque et à la décontamination microbienne". Rouen, 2008. http://www.theses.fr/2008ROUES038.
Pełny tekst źródłaThe gliding electrical discharge "Glidarc" in the humid air is a source of non-thermal plasma at atmospheric pressure efficient for pollution abatement. We present in this thesis the benefit use of reactive properties in temporal post-discharge (i. E. After switch off the discharge) of glidarc. In the first step, we considered the degradation of acidic methyl orange, an azoic dye. After target exposure for short periods to the discharge plasma, a strong temporal post-discharge degradation of the dye giving N,N-dimethyl-4-Nitroaniline, as the major yellow intermediate product with a relevant overall first-order kinetics, was observed. On the other hand, post-discharge has also been used to inactivate micro-organisms. Four micro-organisms in planktonic and adherent forms were considered: Staphylococcus epidermidis and Leuconostoc mesenteroïdes as Gram-positive bacteria, Hafnia alvei as a gram-negative bacterium and Saccharomyces cerevisiae as a yeast model. The post-discharge was used in two ways: the microbial cells were previously exposed to discharge for short periods or they were inactivated by a solution of "plasma activated water”. In all cases, significant reductions of the microbial populations were achieved with 1st order kinetic. Such results combined with the identification of the destruction by HNO2 and H2O2 suggest that nitrous and peroxonitrous acids are the main oxidizing species involved in the temporal post-discharge phenomenon. As the operation takes place under acidic medium, the role of nitrosonium NO+ was also highlighted
El, Hajj Rachelle. "Exploring the potential of emerging technologies in the transformation chain of insects : case of Tenebrio molitor larvae". Electronic Thesis or Diss., Compiègne, 2023. http://www.theses.fr/2023COMP2748.
Pełny tekst źródłaThis thesis aims to explore the use of two emerging technologies, the Instant Controlled Pressure Drop (DIC) and the Pulsed Electric Fields (PEF), as pretreatments for yellow mealworms transformation in a biorefinery concept. The impacts of these technologies on larval microbial decontamination, mortality (killing), enzymatic browning, mechanical pressing for defatting and dewatering, and drying processes were investigated. Conventional blanching in hot water was used as a control for comparison. Results showed that DIC and PEF were both efficient killing methods. The application of DIC treatment at 0.3 MPa resulted in the reduction of the total viable count (TVC) and yeasts and molds counts (YMC) to levels below the established European standards with decimal reduction times of 3.8 s and 3 s for TVC and YMC, respectively. Conventional blanching at 90°C for 360 s also reduced the counts, but with slower decimal reduction times of 67.8 s and 57 s, respectively. However, PEF treatment was not successful in reducing the initial microbial load of the larvae. Moreover, the DIC treatment resulted in a marked improvement in the brightness of the larval juice color which may be attributed to the inactivation of oxidative enzymes, whereas the juice color of blanched, PEF-treated, and untreated larvae was much darker. Blanching followed by hydraulic pressing resulted in a 68% pressing yield, a 48% recovery of the initial protein content, and a press cake with 14.7% lipids/db and 45% dry matter. DIC and PEF both seem to improve this outcome, but each in a different way. Increasing DIC treatment pressure from 0.15 to 0.45 MPa reduced the pressing yield from 68 to 55%, which is believed to be caused by protein aggregation and denaturation, confirmed by fluorescence spectroscopy analysis. As a result of the reduced pressing yield, more proteins were retained in the press cake, resulting in a high protein recovery of 78% and a press cake with 55% dry matter and 12% lipids/db. On the other hand, PEF treatment increased the pressing yield of larvae up to 78% resulting in a higher protein loss in the pressing juice, with a protein recovery of 43%. The press cake generated had 54% dry matter and with 14% lipids/db. PEF was found to be the best method that preserves protein quality, followed by blanching then DIC. Moreover, compared to blanched larvae, DIC treatment reduced drying shrinkage and improved water diffusivity. Additionally, the treatment increased the specific surface area of the dried meal by up to 125% and resulted in a more uniform particle size distribution, both of which improve the end product's quality. PEF treatment also accelerated drying compared to blanching but still lags behind DIC in terms of drying kinetics and water diffusivity. PEF was found to be the most energy-efficient treatment (21.7 kWh/t), followed by blanching (61.7 kWh/t) and DIC (111 kWh/t)
Mazziotti, Mélanie. "Impact des exsudats racinaires de Miscanthus x giganteus sur les microorganismes impliqués dans la bioremédiation d’un sol contaminé au benzo(a)anthracène". Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0046/document.
Pełny tekst źródłaIndustrial activities result of a large number of contaminated sites and soils in France. Among the pollutants found, polycyclic aromatic hydrocarbons (PAHs), and especially those of high molecular weight, are a real environmental and public health problem because of their toxicity and persistence in soils. Biological remediation techniques which stimulate microbial degradation of PAHs using plants (phyto/rhizoremediation), nutrients (biostimulation), or microorganisms (bioaugmentation), appear as interesting strategies because they are more environmental friendly and less expensive than physico-chemical methods. In this context, the ability of the plant Miscanthus x giganteus (MxG) to improve benzo(a)anthracene (BaA) dissipation, a high molecular weight PAH few studied in remediation, was assessed with a multidisciplinary approach through two types of experimentations using an artificially contaminated soil. The first one was to analyze the rhizospheric influence of the plant (phyto/rhizoremediation) over a period of 12 months. Results showed that the presence of MxG led to a 3-fold reduction in BaA concentration in soil at the end of exposure thanks to an increase in pollutant bioavailability, and a positive effect on microbial communities due to a modification of their diversity and an increase in their 16S rRNA and PAH-RHDα GP genes density. In order to improve the understanding of this phenomenon, a second experiment was carried out for 105 days to study specifically the influence of certain molecules exuded in the plant’s root system (biostimulation), and specific microorganisms associated with its rhizosphere having the capacity to degrade BaA (bioaugmentation). These tests demonstrated the complexity of rhizospheric mechanisms, and the necessity to explore this type of analysis to improve the understanding of biodegradation processes in plant rhizosphere. All these results showed that MxG was an ideal candidate for phyto/rhizoremediation of soils contaminated with high molecular weight PAH, but that further studies were still needed to understand processes involved in its rhizosphere
Ammor, Mohammed Salim. "Ecoystème microbien d'un atelier fermier de salaison : identification et propriétés des bactéries lactiques". Rennes, Agrocampus Ouest, 2004. http://www.theses.fr/2004NSARB160.
Pełny tekst źródłaAmmor, Mohammed Salim. "Ecosystème microbien d'un atelier fermier de salaison : Identification et propriétés des bactéries lactiques". Phd thesis, Agrocampus - Ecole nationale supérieure d'agronomie de rennes, 2004. http://tel.archives-ouvertes.fr/tel-00104633.
Pełny tekst źródłaNotre étude réalisée dans le cadre de 2 programmes, régional et européen, avait pour objectif d'étudier l'écosystème microbien d'un atelier fermier de salaison n'utilisant pas de ferment et de proposer des solutions pour améliorer la qualité hygiénique et technologique du saucisson sec, sans affecter sa typicité.
La description quantitative et qualitative de l'écosystème microbien de cet atelier fermier a montré une faible maîtrise de l'hygiène, une mise en œuvre de procédures de nettoyage et de désinfection non appropriées, ainsi qu'une faible acidité du produit (pH 6,2 – 6,5). A partir de la souchothèque constituée au cours de cette première étape, nous avons identifié et caractérisé la flore lactique, en vue de développer un ferment lactique et une « flore barrière » à partir de la flore endogène à l'atelier.
Les identifications de 88 isolats de la flore lactique par approche phénotypique, génotypique et spectroscopique ont montré qu'Enterococcus faecium (25%) et Vagococcus carniphilus (12,5%) étaient les espèces dominantes au niveau des surfaces et des équipements de l'atelier, alors que Lactococcus garvieae (18,2%) et Lactobacillus sakei (40,9%) étaient, respectivement, les espèces dominantes au niveau de la mêlée et du saucisson.
Les 36 souches de Lb. sakei identifiées ont été caractérisées par rapport à leur potentiel d'utilisation comme ferments. Une analyse multivariée des résultats obtenus a permis de sélectionner 2 souches pouvant être utilisées dans le développement d'un ferment spécifique à cet atelier. En outre, 5 Vc. carniphilus, 3 Ec. faecium, 1 Lb. sakei et 1 Enterococcus sp. ont été testées pour leur effet antibactérien à l'encontre de Listeria innocua, Staphylococcus aureus et/ou Hafnia alvei en conditions de biofilms bi-espèces. Deux souches d'Ec. faecium ont été caractérisées comme pouvant jouer le rôle de « flore barrière » au niveau des surfaces et des équipements de l'atelier.
Par ailleurs, dans une perspective de mise en place de procédures de décontamination appropriées à cet atelier, différentes solutions de désinfection ont été testées pour leur effet bactéricide sélectif sur des bactéries d'intérêt technologique, d'altération et pathogène, isolées de cet atelier et cultivées en biofilms. Le désinfectant utilisé dans cet atelier s'est avéré non sélectif détruisant la flore d'intérêt technologique. Par contre, la solution d'acide acétique à pH 5,4 contenant 0,075% p/v de monolaurine s'est montrée sélective, inhibant la flore indésirable à des niveaux pouvant atteindre 4 log10 u.f.c/ml alors que la flore d'intérêt technologique n'a été que peu affectée.
L'ensemble de ces résultats suggère la possibilité d'améliorer la qualité des saucissons secs fermiers en adoptant une approche de type écologie microbienne dirigée dans les ateliers fermiers.