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Dissertations / Theses on the topic 'Spores and Biofilms'

Author: Grafiati

Published: 22 June 2024

Last updated: 31 July 2025

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1

PORTINHA, Inês Cunha. "Exploring the evolutionary link between biofilms and spores formation in spore-formers." Master's thesis, Instituto de Higiene e Medicina Tropical, 2015. http://hdl.handle.net/10362/19323.

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Bacteria are often thought as single cell organisms, however they can develop into morphologically complex multicellular communities composed of different subpopulations of specialized cell types. Biofilm is an example, in which bacteria organize for protection from harmful conditions in the host and to create nutrient-rich areas. In the last years biofilm have been show to comprise an important aspect of microbial persistence in the human gut. Endospore-formers, although thought not to be major constituents of the microbiota in the human intestine, cause several intestinal diseases, usually a

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2

Iapichino, Martina. "Motilité individuelle et collective chez les systèmes microbiens : biofilms bactériens et dispersion de spores fongiques." Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4051.

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Le but de cette thèse est de développer des expériences pour comprendre la physique de la motilité dans deux systèmes microbiens, vivant dans le domaine du faible nombre de Reynolds, c’est-à-dire lorsque les forces visqueuses l’emportent sur les forces d’inertie. La première partie de la thèse traite de la croissance de biofilms bactériens sur une surface solide. Les biofilms bactériens sont des communautés de cellules étroitement empilées dans une matrice polymère. Du point de vue physique, ces colonies se comportent comme des gels et la matrice polymérique crée des flux osmotiques qui permet

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3

Le, Toquin Esther. "Mode d'action biocide de nouveaux procédés de décontamination sur deux formes de résistances bactériennes." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR103/document.

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Il existe de nombreuses technologies de décontamination, néanmoins les spores et les biofilms bactériens demeurent une préoccupation majeure dans de nombreux domaines, tels que le secteur hospitalier, alimentaire et de la biodéfense car elles sont résistantes. Une mousse novatrice contenant un biocide (l’hypochlorite de sodium ou le peroxyde d’hydrogène) et un agent stabilisant (le Xanthane) a été étudiée pour répondre à ce besoin. Cette mousse a la capacité d’être mise en oeuvre de différentes façons sur le terrain par : pulvérisation au sol ; talochage et pulvérisation sur les murs ; remplis

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4

Al, Saabi Alexandre-Ahmad. "Mousses en écoulement pour le nettoyage d’équipements fermés contaminés par des spores de Bacillus cereus ou des biofilms de Pseudomonas fluorescens." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1R015.

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Les contaminants tels que les spores / biofilms sont problématiques dans nombreux secteurs de l'industrie alimentaire. En effet, même après les procédures d'hygiène, ces biofilm/spores pouvaient être retrouvés sur toutes les surfaces en contact direct ou non direct avec les aliments (Bénézech & Faille, 2018). Les risques associés aux biofilms peuvent être contrôlés soit en limitant le nombre des cellules adhérentes, soit en facilitant l'élimination des bactéries adhérentes. Le nettoyage en place (CIP) est une pratique de nettoyage courante et est largement utilisée dans les industries alim

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5

Al, Saabi Alexandre-Ahmad. "Mousses en écoulement pour le nettoyage d’équipements fermés contaminés par des spores de Bacillus cereus ou des biofilms de Pseudomonas fluorescens." Electronic Thesis or Diss., Université de Lille (2018-2021), 2020. http://www.theses.fr/2020LILUR015.

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Les contaminants tels que les spores / biofilms sont problématiques dans nombreux secteurs de l'industrie alimentaire. En effet, même après les procédures d'hygiène, ces biofilm/spores pouvaient être retrouvés sur toutes les surfaces en contact direct ou non direct avec les aliments (Bénézech & Faille, 2018). Les risques associés aux biofilms peuvent être contrôlés soit en limitant le nombre des cellules adhérentes, soit en facilitant l'élimination des bactéries adhérentes. Le nettoyage en place (CIP) est une pratique de nettoyage courante et est largement utilisée dans les industries alim

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6

Dallagi, Heni. "Numerical and experimental investigations of the rheological behavior of foam flow : application to the cleaning of surfaces contaminated by microorganisms in the food industries." Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR003.

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La caractérisation expérimentale et numérique du comportement rhéologique d'une mousse aqueuse s'écoulant à l'intérieur d'un tuyau horizontal avec et sans singularités (demi-expansion soudaine, et chicane) a été étudiée. Différentes conditions d'écoulement ont été étudiées en faisant varier les qualités de mousse (55-85%), et trois nombres de Reynolds (32, 65, et 97). Les mesures de la pression, de la répartition de la vitesse locale et de la contrariante et de l'épaisseur des films liquides au niveau de la paroi à l'aide respectivement de capteurs de pression, de la PIV, de la polarographie e

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7

Ribeiro, Maria Cecília Enes. "Adesão e formação de biofilme por Bacillus cereus em aço inoxidável." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/255191.

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Orientador: Mirna Lucia Gigante<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-30T23:01:21Z (GMT). No. of bitstreams: 1 Ribeiro_MariaCeciliaEnes_D.pdf: 17038739 bytes, checksum: 54c8350faac4b14e773283e6e871aa78 (MD5) Previous issue date: 2015<br>Resumo: O objetivo geral deste trabalho foi avaliar o efeito de diferentes matrizes na adesão e formação de biofilme em aço inoxidável por Bacillus cereus, bem como avaliar a eficiência dos procedimentos de higienização no controle de biofilmes de esporos desse micr

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8

Shane, William T. "Persistence of Spore Forming Bacteria on Drinking Water Biofilm and Evaluation of Decontamination Methods." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1205164893.

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9

Packard, Benjamin H. "Retention and Removal of Bacterial Endospores from Common Drinking Water Distribution System Pipe Materials." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1277132818.

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10

Gorinati, Camilla. "Caratterizzazione funzionale di sorgenti plasma di non equilibrio a pressione atmosferica per l’eradicazione di biofilm batterici e l’inattivazione di spore." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Durante la mia attività di tesi mi sono focalizzata sulla caratterizzazione funzionale di una sorgente plasma surface Dielectric Barrier Discharge (sDBD) impiegata per l’inattivazione di spore batteriche di Geobacillus stearothermophilus, e per l’eradicazione di biofilm batterici di Staphylococcus aureus e Pseudomonas aeruginosa. Durante la prima attività è stata compiuta la caratterizzazione elettrica della sorgente sDBD e sono state condotte analisi di temperatura all’interno del volume di trattamento della sorgente. In seguito sono stati eseguiti test biologici per dimostrare l’efficacia d

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11

Fuchs, Felix Matthias. "Bacillus subtilis biofilm formation under extreme terrestrial and simulated extraterrestrial conditions." Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-13A9-7.

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12

Gonçalves, Bruno Alexandre Amaral. "Studies on the relationship between assembly of the spore coat and the biofilm." Master's thesis, 2020. http://hdl.handle.net/10451/48586.

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Tese de mestrado, Microbiologia Aplicada, Universidade de Lisboa, Faculdade de Ciências, 2021<br>In the model organism Bacillus subtilis, the surface of the spore consists of a protein coat that affords protection against noxious chemicals and lytic enzymes and modulates spore germination and binding to cells and abiotic surfaces. The coat, formed by over 80 proteins, is divided into an inner layer, an outer layer and a crust. The coat proteins are synthesized in the mother cell and are recruited to the surface of the developing spores through specific protein-protein interactions and also acc

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13

Putri, TP. "Understanding thermophilic spore-forming bacteria in milk powders." Thesis, 2017. https://eprints.utas.edu.au/27361/1/Putri_whole_thesis.pdf.

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Thermophilic spore-forming bacteria such as Geobacillus spp. are common contaminants of milk powder processing plants. Their spores can remain viable throughout the entire dairy powder industrial process, including pasteurisation (72 °C for 15s) and the even hotter evaporator sections. Geobacillus spp. can form biofilms in dairy processing equipment that, over extended run times (e.g., >16 h), can deposit unacceptably high spore loads in end-product. While not dangerous to human health, this potentially leads to quality defects and price reductions, requiring that the process be stopped and th

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14

Balasubramanian, Srikkanth. "Novel anti-infectives against pathogenic bacteria." Doctoral thesis, 2018. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-163882.

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Marine sponge-associated actinomycetes are reservoirs of diverse natural products with novel biological activities. Their antibiotic potential has been well explored against a range of Gram positive and negative bacteria. However, not much is known about their anti-infective or anti-virulence potential against human pathogens. This Ph.D. project aimed to investigate the anti-infective (anti-Shiga toxin and anti-biofilm) potential of sponge-derived actinobacteria through identification and isolation of their bioactive metabolites produced and characterizing their mechanism of action by transcri

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15

Pollak, Jérôme. "Développement et utilisation de sources de plasma pour stériliser des instruments médicaux." Thèse, 2009. http://hdl.handle.net/1866/6409.

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16

Palmer, Jon Stuart. "Surface characteristics of an adhesive thermophilic spore-forming Bacillus, isolated from milk powder : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Food Technology at Massey University, Palmerston North, New Zealand." 2008. http://hdl.handle.net/10179/1384.

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The growth of thermophiles during the manufacture of milk powder leads to a progressive increase in the number of thermophilic bacteria contaminating the final product. The limited residence time of the milk in the plant during milk powder manufacture and the concentration effect of converting milk into milk powder cannot explain the number of thermophiles found in the final product. This suggests that thermophiles are attaching to the large surface area of stainless steel found within a milk powder plant and then growing and developing into biofilms, with individual cells and/or biofilm fragm

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