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Dissertations / Theses on the topic 'Biofield Science'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Shoukat, Kamran. "Biofilm formation and biocide resistance of Acinetobacter baumannii." Thesis, University of Huddersfield, 2014. http://eprints.hud.ac.uk/id/eprint/23485/.

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Multi drug resistant (MDR) strains of Acinetobacter baumannii have emerged as a major cause of nosocomial infections associated with significant morbidity and mortality. Over the last 20 years a worldwide expansion in Acinetobacter infections has been observed associated with intensive care units (ICUs), long term care facilities and wounded armed forces personnel. The developing resistance patterns seen in Acinetobacter sp suggest that the number of effective antibiotics may shortly be exhausted. The ability of Acinetobacter sp to form biofilms, resist desiccation and persist on hospital surf

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2

Park, Albert H. "Inhibition of biofilm growth on highly polycationic polyelectrolyte multilayers." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43209.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, June 2008.<br>"May 16, 2008."<br>Includes bibliographical references.<br>The epithelial cell adhesion molecule E-cadherin is often down regulated during carcinoma progression and metastatic spread of tumors. However, the precise mechanism and molecular basis of metastasis promotion by E-cadherin loss is not completely understood. To investigate its role in metastasis, I utilized two distinct methods of E-cadherin inhibition that distinguish between E-cadherin's cell-cell adhesion and intracellular

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3

Awadh, Ammar A. "Biofilm formation and characterisation in human mycoplasmas." Thesis, Kingston University, 2014. http://eprints.kingston.ac.uk/32196/.

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Mycoplasmas are the smallest and simplest self-replicating prokaryotes, lacking a cell wall and are bound by a single membrane-the plasma membrane. Moreover, mycoplasmas are consequential and chronic pathogens of humans and animals that rely on adhesion to host tissue for colonisation and infections. In other word biofilm formation is correlated with infections and because of this, the biofilm formation of Mycoplasma species has been investigated and characterised in this project. The viability of biofilm formation was assessed and quantified using crystal violet assay over 20-day incubation p

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4

Lee, Chun-Teh. "Impact of Resolvin E1 on Experimental Periodontitis and Periodontal Biofilm." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17331953.

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Objective: The goal of this project was to determine the impact of local inflammation on changes in the subgingival biofilm composition in ligature-induced periodontitis in rats using the specialized pro-resolving mediator (SPM), resolvin E1 (RvE1). Materials and Methods: The impact of RvE1 on the microbiota of ligature-induced periodontitis was assessed in two separate experiments; treatment of established periodontitis and prevention of ligature-induced periodontitis. In the treatment study, eighteen rats were separated into four groups comprising no ligature, ligature alone (no treatment),

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5

Epstein, Alexander. "Bioinspired, Dynamic, Structured Surfaces for Biofilm Prevention." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10505.

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Bacteria primarily exist in robust, surface-associated communities known as biofilms, ubiquitous in both natural and anthropogenic environments. Mature biofilms resist a wide range of biocidal treatments and pose persistent pathogenic threats. Treatment of adherent biofilm is difficult, costly, and, in medical systems such as catheters, frequently impossible. Adding to the challenge, we have discovered that biofilm can be both impenetrable to vapors and extremely nonwetting, repelling even low surface tension commercial antimicrobials. Our study shows multiple contributing factors, including

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6

Akbar, Sirwan. "Gram negative bacterial biofilm formation and characterisation of extracellular polymeric substances." Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/30236/.

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Gram negative bacteria such as Stenotrophomonas maltophilia, Pseudomonas aeruginosa and Citrobacter freundii are often associated with multiple drug resistance and the generation of nosocomial infections. In the current study several clinical strains of theses bacteria (Ps 1, Ps 3, Ps 5, St 18, St 51, St 53 and C. freundii) and two culture collection strains Ps 10421 and St 9203 were evaluated for their ability to generate biofilms and the characteristics of the associated extracellular polysaccharides they produced. The ability of these strains to develop biofilms on a range of media and with

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7

Zhang, Siyuan. "Biofilm Removal with Acoustic Cavitation and Lavage." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1356194652.

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8

Assefa, Aster. "Single cell analysis of attached microbes in sediment and biofilm." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323286.

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9

Johnson, Christopher Douglas. "A Parallel Genetic Algorithm for Optimizing Multicellular Models Applied to Biofilm Wrinkling." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/5442.

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Multiscale computational models integrating sub-cellular, cellular, and multicellular levels can be powerful tools that help researchers replicate, understand, and predict multicellular biological phenomena. To leverage their potential, these models need correct parameter values, which specify cellular physiology and affect multicellular outcomes. This work presents a robust parameter optimization method, utilizing a parallel and distributed genetic-algorithm software package. A genetic algorithm was chosen because of its superiority in fitting complex functions for which mathematical techniqu

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10

Fabrega, Julia. "The impacts of silver nanoparticles on planktonic and biofilm bacteria." Thesis, University of Birmingham, 2009. http://etheses.bham.ac.uk//id/eprint/346/.

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Nanoscale silver particles represent a new generation of cost-effective antibacterial technologies. Due to the increased manufacturing and use of silver nanoparticles (Ag NPs) in consumer goods their release and accumulation into the environment is highly likely but their fate, behaviour and toxicity to organisms is still very much unknown. The present study has investigated the effect that different environmental conditions have on the behaviour and fate of Ag NPs in waters by determining aggregation state, stability and solubility. This work has also determined their interaction and uptake t

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11

Staffen, Dana Jean. "Environmental Factors Influence Nontypeable Haemophilus influenzae Biofilm Formation, Maturation and Gene Expression." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1385497645.

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12

Schrottenbaum, Ines. "Influence of Wall Biofilm on Pathogen Transport in Water Distribution Systems. Modeling Estimates Derived from Synthetic Biofilm Experiments." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1427812859.

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13

Wassinger, Andrew Benedict. "Molecular Attributes affecting the Biofilm Formation of Listeria monocytogenes." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316380350.

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14

Hart, Alaina. "Effects of Biofilm Age and Composition on Oyster Larval Setting." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/14.

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The lack of success in restoring oyster, Crassostrea virginica, populations to Chesapeake Bay and its tributaries has raised many questions about why many restoration efforts have failed. A number of studies have focused on the larval stage of oysters and considered the variables that impact oyster setting behavior in an effort to understand why oyster populations have not recovered. Studies that have examined setting surfaces suggest that biofilms promote oyster larval settlement; however, similar studies with barnacle larvae have found an inhibitory relationship. The present study utilize

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15

Robison, Pamula J. "Mathematical Modelling of Biofilm Growth and Decay Through Various Deliveries of Antimicrobial." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1258769688.

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16

Buckman, Kevin D. "A Mathematical Model of Biofilm Growth and Decay with Applications of Antimicrobial." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1333910050.

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17

Stipetic, Laurence Harry. "Metabolomics as a tool to explore the staphylococcal biofilm." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7377/.

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Orthopaedic infections can be polymicrobial existing as a microbiome. Infections often incorporate staphylococcal species, including Staphylococcus aureus. Such infections can lead to life threatening illness and implant failure. Furthermore, biofilm formation on the implant surface can occur, increasing pathogenicity, exacerbating antibiotic resistance and altering antimicrobial mechanism of action. Bacteria change dramatically during the transition to a biofilm growth state: phenotypically; transcriptionally; and metabolically, highlighting the need for research into molecular mechanisms inv

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18

Woolsey, Paul A. "Rotating Algal Biofilm Reactors: Mathematical Modeling and Lipid Production." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1107.

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Harvesting of algal biomass presents a large barrier to the success of biofuels made from algae feedstock. Small cell sizes coupled with dilute concentrations of biomass in lagoon systems make separation an expensive and energy intense-process. The rotating algal biofilm reactor (RABR) has been developed at USU to provide a sustainable technology solution to this issue. Algae cells grown as a biofilm are concentrated in one location for ease of harvesting of high density biomass. A mathematical model of this biofilm system was developed based on data generated from three pilot scale reactors a

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19

Tirpanci, Goksel. "Decontamination of Food Processing Equipment Contaminated with Biofilm-forming Pseudomonas spp. by Ozone-based Cleaning-in-place." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1322666028.

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20

Van, Gray Jonathon B. "Disturbance effects on assembly and recovery dynamics of freshwater microbial biofilm communitieis." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1556556989587688.

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21

Dibelka, James. "MATERNAL INFLUENCES ON THE DEVELOPMENT OF INFANT ORAL BIOFILM." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2457.

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Purpose: The purpose was to examine the maternal influences on the development of infant oral biofim and dominant bacterial strains of at risk populations. Methods: The study used a cross-sectional design to examine factors influencing biofilm colonization and the identification of bacterial strains transmitted from mother to child. Participants were enrolled in Children’s Health Involving Parents of Greater Richmond (CHIP). Plaque and saliva samples were collected from mothers and their children ages 6-36 months. The colonized oral bacteria strains of the mother infant dyads were then c

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22

Gibbs, Shawn Glen. "Cross-Connections in Potable Water Distribution Systems: The Fate of Wastewater Microbes Introduced into a Distribution System Simulator." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1029349273.

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23

Patterson, Jennifer. "Characterization of adherence, cytotoxicity and biofilm formation by Gardnerella vaginalis." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/66.

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Worldwide, bacterial vaginosis (BV) is the most common vaginal disorder in women of childbearing age. BV is of major clinical importance due to its ability to significantly affect pregnancy outcome and enhance the transmission and acquisition of HIV. BV is characterized by a dramatic shift in the vaginal microflora; in most BV cases, the predominant bacterial species is Gardnerella vaginalis. It has been demonstrated that G. vaginalis forms an adherent biofilm on the vaginal epithelium of women with BV. Furthemore, evidence suggests that the high rate of recurrence associated with BV is re

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24

Abraham, Nabil Mathew. "Characterization of the Effect of Serum and Chelating Agents on Staphylococcus aureus Biofilm Formation; Chelating Agents Augment Biofilm Formation through Clumping Factor B." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2596.

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Staphylococcus aureus is the causative agent of a diverse array of acute and chronic infections, and some these infections, including infective endocarditis, joint infections, and medical device-associated bloodstream infections, depend upon its capacity to form tenacious biofilms on surfaces. Inserted medical devices such as intravenous catheters, pacemakers, and artificial heart valves save lives, but unfortunately, they can also serve as a substrate on which S. aureus can form a biofilm, attributing S. aureus as a leading cause of medical device-related infections. The major aim of this wor

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25

Dowling, Ruth. "Biofilm formation in clinical and laboratory strains of Escherichia coli and Campylobacter jejuni." Thesis, University of Central Lancashire, 2006. http://clok.uclan.ac.uk/21822/.

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Biorilms are structured communities of bacterial cells enclosed in a self-produced polymeric matrix that are adherent to an inert or living surface. Their growth on the surface of catheter lines, artificial joints and other surgical implants is of major medical concern. As many laboratory strains have become accustomed to standardised conditions, they are not necessarily representative of clinical strains. This study investigated the effect of horse blood, human blood and human blood components on biofilm. formation by clinical and laboratory isolates of Escherichia coli and Campylobacter jeju

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26

Rexvid, Shadi, and Åsa Lundmark. "Quantification of Biofilm Formation of Aggregatibacter actinomycetemcomitans with Various Genotype and Phenotype." Thesis, Umeå universitet, Institutionen för odontologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-143975.

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ABSTRACT Biofilm is associated to many chronic infections among which periodontitis in one. Aggregatibacter actinomycetemcomitans is a related bacterium associated to aggressive periodontitis with early onset in younger individuals. In a previous study where bacterial samples were collected from adolescents in Ghana, a specific genotype of A. actinomycetemcomitans, serotype b, was found to be highly virulent and associated to the increased risk of developing attachment loss (AL ≥ 3 mm). This study aimed at determining biofilm formation on 45 serotype b isolates of A. actinomycetemcomitans fr

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27

Adnan, Mohd. "An investigation of the genetic control of biofilm formation in bacteria (E. coli K-12 MG1655)." Thesis, University of Central Lancashire, 2012. http://clok.uclan.ac.uk/4882/.

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The ability to adapt to changing environments is essential for survival. Bacteria have developed sophisticated means by which they sense and respond to stresses imposed by changes in the environment. Escherichia coli (E. coli) have served as a model organism for studies in molecular genetics and physiology since the 1960s. I have undertaken this study and address three outstanding questions. Firstly, the involvement of morphogene bolA and RNA polymerase sigma factor (rpoS) in biofilm formation. Secondly, the effect on respiratory activity of E. coli in presence and absence of these two genes a

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28

MASSA, MARCO. "Formazione di biofilm e resistenza ai biocidi in Listeria." Doctoral thesis, Università Cattolica del Sacro Cuore, 2011. http://hdl.handle.net/10280/965.

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La presente attività di ricerca ha avuto come oggetto di studio la formazione di biofilm in condizioni dinamiche: per raggiungere tale obiettivo, è stato costruito un idoneo apparato che permettesse di ottenere una valutazione quantitativa sia delle cellule presenti nella soluzione di crescita sia di quelle adese su tre materiali di prova(acciaio inossidabile, PET e rame). Oltre ad esprimere una valutazione dell’adesione batterica alle superfici, si è proceduto ad indagare sui possibili parametri sperimentali che potessero influenzare la formazione di biofilmdi Listeria su superfici abiotich

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MASSA, MARCO. "Formazione di biofilm e resistenza ai biocidi in Listeria." Doctoral thesis, Università Cattolica del Sacro Cuore, 2011. http://hdl.handle.net/10280/965.

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La presente attività di ricerca ha avuto come oggetto di studio la formazione di biofilm in condizioni dinamiche: per raggiungere tale obiettivo, è stato costruito un idoneo apparato che permettesse di ottenere una valutazione quantitativa sia delle cellule presenti nella soluzione di crescita sia di quelle adese su tre materiali di prova(acciaio inossidabile, PET e rame). Oltre ad esprimere una valutazione dell’adesione batterica alle superfici, si è proceduto ad indagare sui possibili parametri sperimentali che potessero influenzare la formazione di biofilmdi Listeria su superfici abiotich

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30

McCall, Stephanie Jane. "Investigating the effects of nutrient concentration and light intensity on benthic biofilm development and phytoplankton growth in UK rivers." Thesis, University of Portsmouth, 2014. https://researchportal.port.ac.uk/portal/en/theses/investigating-the-effects-of-nutrient-concentration-and-light-intensity-on-benthic-biofilm-development-and-phytoplankton-growth-in-uk-rivers(5bb096f7-b9fb-4a4f-a714-e2f05271800d).html.

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Phosphorus is often considered the limiting nutrient in rivers, and reducing concentrations has long been a key policy focus. However, experience has shown that many phosphorus mitigation schemes fail to achieve any improvements in ecological status. The primary aim of this thesis is to identify target phosphorus concentrations that need to be attained to improve river ecology. In-stream flume mesocosms were deployed on three UK rivers of varying levels of nutrient enrichment. Phosphorus concentrations were simultaneously increased and decreased (by iron-dosing) to provide a concentration grad

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31

Hays, Lindsay Elizabeth. "A preliminary analysis of the lipid contents of a biofilm from a Yellowstone hydrothermal pool." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/114321.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2005.<br>Cataloged from PDF version of thesis. Original thesis missing page 15.<br>Includes bibliographical references (pages 28-30).<br>The hot springs at Yellowstone National Park, such as Obsidian Pool, have been extensively studied as a source for previously unidentified microorganisms. Most of the previous studies focused on the genomic diversity of these environments, but recent interest in environmental samples for the study of lipid biomarkers has extended to these hot springs

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32

Borglin, Matthew R. "Analysis of Biofilm Remediation Capacity For Octenyl Succinic Anhydride (OSA), A Bioactive Food Starch Modifier Compound." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2168.

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Matthew R. Borglin This thesis demonstrates efficacy of Octenyl Succinic Anhydride (OSA), as a biofilm sanitizer. Biofilms allow bacteria to adhere to solid surfaces with the use of excreted polymeric compounds. For example, surfaces found in food production or processing facilities such as the interior of a raw milk holding tank, are some of the most susceptible to biofilm contamination. When present, biofilms can cause a variety of negative effects, which include; reduction of product shelf life, corrosion, and outbreaks of foodborne illnesses. The close association of biofilms with the majo

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33

Renier, Sandra. "Déterminants protéiques de la voie de sécrétion Sec impliqués dans la formation de biofilm chez Listeria monocytogenes." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00844396.

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Listeria monocytogenes est une bactérie pathogène impliquée dans la toxi-infection alimentaire à l'origine de la listeriose, une maladie peu fréquente mais avec un taux de mortalité de 25 % chez l'homme. Cette bactérie est capable de former un biofilm lui permettant de mieux résister aux stress environnementaux ainsi qu'aux traitements de décontamination. Une nouvelle stratégie d'analyse génomique a été développée et a permis de cibler des systèmes de sécrétion et des protéines potentiellement impliqués dans la formation de biofilm. L'inactivation de la voie SecA2 entraîne la formation d'un bi

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34

Delgadillo, Maricela. "Study of the effect of mechanical stiffness substrata, assembled with polyelectrolyte multilayer thin films, on biofilm forming staphylococcus epidermidis' initial adhesion mechanism." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43212.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2008.<br>Includes bibliographical references (p. 35).<br>Polyelectrolyte multilayer thin films are polymer films assembled through a layer-by-layer sequential addition of oppositely charged polymers. The layer-by-layer film assembly technique allows for properties such as film thickness, chemical functionality, and elastic moduli to be easily altered by changing the pH in solution, or the number of bilayers added. This thesis examined the use of polyelectrolyte multilayer films, assembled with pol

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35

Brancho, Jennie. "Effects of Precipitation Patterns on Sediment, Nutrient, and Biofilm Dynamics in an Acid Mine Drainage Stream." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou155439364661881.

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36

Picard, Charlotte. "Transfert de matière dans un biofilm aéré sur membrane." Phd thesis, Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1488/.

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Les réacteurs à biofilm aéré sur membrane sont des procédés innovants de traitement de l'eau. Les substrats nécessaires à la croissance bactérienne sont en contre-diffusion dans le biofilm. Ainsi, pour maitriser la capacité de traitement de ces réacteurs, il est nécessaire de comprendre le transfert de matière dans ces biofilms. Ce travail présente les résultats expérimentaux du transfert de matière mesuré par un traceur non réactif dans des biofilms mixtes hétérotrophes aérobies. Plusieurs conditions hydrodynamiques ont été appliquées pour la croissance des biofilms. La présence de convection

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Picard, Charlotte. "Transfert de matière dans un biofilm aéré sur membrane." Phd thesis, Université Paul Sabatier - Toulouse III, 2011. http://tel.archives-ouvertes.fr/tel-00650179.

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Les réacteurs à biofilm aéré sur membrane sont des procédés innovants de traitement de l'eau. Les substrats nécessaires à la croissance bactérienne sont en contre-diffusion dans le biofilm. Ainsi, pour maitriser la capacité de traitement de ces réacteurs, il est nécessaire de comprendre le transfert de matière dans ces biofilms. Ce travail présente les résultats expérimentaux du transfert de matière mesuré par un traceur non réactif dans des biofilms mixtes hétérotrophes aérobies. Plusieurs conditions hydrodynamiques ont été appliquées pour la croissance des biofilms. La présence de convection

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38

Yang, Nan. "Role of Escherichia coli curli in relation with intestinal components - mucin, Klebsiella pneumoniae and Enterococcus faecalis." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00657247.

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Bacteria in nature mostly exist in biofilms, which are structured adherent communities encased in polymeric matrices. In the human body, most biofilms are composed of commensal microorganisms with the gastrointestinal tract being the most heavily colonized site. Bacterial attachment to the overlying mucus gel layer of the intestinal epithelium is fundamental to the establishment of a stable commensal microflora. However the interaction of bacteria with the complex mucus gel is poorly described. Moreover, the complexity and diversity of the gut microbiota is itself an obstacle to studying its b

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39

Hauptmann, Demian. "Seasonality of resource limitation of stream biofilm : Nutrient limitation of an arctic stream in northern Sweden." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-155851.

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Arctic ecosystems are sensitive to climate change and this biome is experiencing accelerated warming. Climate change in the arctic is projected to further alter precipitation and temperature patterns, which may influence land-water interactions in the future. Such changes have the potential to affect aquatic biofilm communities (i.e., algae, bacteria, and fungi) that form the base of riverine food webs, yet are sensitive to changes in thermal and light regimes, and are potentially limited by macronutrients like carbon (C), nitrogen (N) and phosphorus (P). This study investigated the patterns o

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40

Siddiqui, Nausheen A. "The Effect of Alcaligenes faecalis on Inhibition of Candida albicans Biofilm and Planktonic Growth." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/honors/575.

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Candida albicans is a fungal microorganism found on the human body and in the environment. An opportunistic pathogen causing local and systemic infection, this fungus is one of the leading causes of nosocomial infections. More alarming is its growing resistance against the limited number of antifungals we have for treatment Candida infections. An area of current research, termed polymicrobial interactions, focuses on how different microorganisms interact with each other for limited space, nutrients, and survival. The current study focuses on attempting to inhibit planktonic and biofilm growth

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41

Arambewela, Mahendranath K. J. "The Fate of Aeromonas hydrophila in a Model Water Distribution System Biofilm Annular Reactor." Cincinnati, Ohio : University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1227220557.

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Thesis (M.S.)--University of Cincinnati, 2008.<br>Advisor: Margaret Kupferle Ph. D. (Committee Chair), Steven Buchberger Ph. D. (Committee Member), Mark Rodgers Ph. D. (Committee Member), Randy Revetta (Committee Member). Title from electronic thesis title page (viewed Jan. 18, 2009). Includes abstract. Keywords: Aeromonas hydrophila; Biofilm: Biofilm Reactors; Drinking water; Iron coupons; Phospholipid phosphate; Polycarbonate coupons; Water quality. Includes bibliographical references.

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42

Perera, Kuruppu Arachchige Kalyani. "Characteristics of a developing biofilm in a petrochemical wastewater treatment plant." Thesis, View thesis, 2003. http://handle.uws.edu.au:8081/1959.7/777.

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A study was undertaken to investigate developing biofilms in a petrochemical wastewater treatment plant encompassing the architecture, microflora and the chemical nature of the matrix. Biofilms were developed on glass slides immersed in the activated sludge unit and analysed at known time intervals using a range of techniques. Initially, biofilms were investigated using conventional and emerging microscopic approaches to select a suitable technique. Scanning Confocal Laser Microscopy (SCLM) allowed visualisation of biofilms in situ with minimal background interference and non-destructive and o

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43

Perrin, Claire. "Implication et régulation de la production des curli dans la résistance au nickel au sein de biofilms d'Escherichia coli K-12." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00831575.

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Le nickel est connu pour son utilisation dans la préparation d'alliages réputés peu sensibles à la contamination bactérienne, très utilisés dans les secteurs agro-alimentaires et médicaux. Cependant, les bactéries apparaissent capables d'adhérer même à ce type de matériau et de le coloniser sous forme de biofilms. Les biofilms sont des communautés de micro-organismes, adhérant entre eux et à une surface, grâce à la sécrétion d'une matrice adhésive offrant une protection contre la dessiccation, les défenses de l'hôte et un grand nombre d'agents antimicrobiens. Ces biofilms manifestent des propr

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44

Abdul, Rahim Soha, and Carolina Robertsson. "Cariogenic potential of dental biofilm bacteria -support for caries as a polymicrobial disease." Thesis, Malmö högskola, Odontologiska fakulteten (OD), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19830.

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Syfte: Tillväxt och syraproduktion undersöktes i olika suspensioner hos bakterier som är vanligt förekommande i den dentala biofilmen. Förekomst av buffringskapacitet till följd av proteolytisk aktivitet i artificiellt konsortium och oralt konsortium undersöktes också.Material och metod: Färska isolat av Actinomyces, Lactobacillus paracasei, Streptococcus mutans, Streptococcus intermedius och Streptococcus oralis inkuberades i tillväxtmedium med neutralt eller surt initialt pH, med eller utan glukos och/ eller urea. Tillväxten undersöktes genom mätning av optisk densitet vid 600nm. Syra- och a

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45

Alajmi, Faleh. "Water sorption of flowable composites." Master's thesis, Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/367584.

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Oral Biology<br>M.S.<br>ABSTRACT Objectives: Flowable composites are characterized by lower filler loading and a greater proportion of diluent monomers in their formulation. These composites were traditionally created by retaining the same small particle size of the conventional hybrid composites, but reducing the filler content and allowing the increased resin to reduce the viscosity of the mixture However, their various mechanical properties such as flexural strength and wear resistance have been reported to be generally inferior compared to those of the conventional composites. Dental resto

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46

Fazekas, Hannah M. "River biofilm structure and function in a resource landscape modified by agriculture: implications for primary consumers." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1535118088003803.

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Blanco, Cabra Núria. "Noves metodologies per al tractament de bacteris creixent en forma de biofilm." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/671668.

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Les infeccions bacterianes han esdevingut un greu problema a escala mundial per culpa del mal ús que hom ha fet dels antibiòtics. L’adquisició de resistències als antimicrobians s’ha accelerat i cada cop hi ha més bacteris resistents a tots els antibiòtics coneguts. Aquest problema es veu agreujat quan els bacteris formen un biofilm i les infeccions es tornen cròniques. Els bacteris creixents en forma de biofilm produeixen una matriu extracel·lular protectora i adquireixen així un mecanisme extra de protecció vers els antibiòtics. A més, en l’actualitat no hi ha cap antibiòtic desenvolupat que

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Fromantin, Isabelle. "Etude de la flore bactérienne dans les plaies tumorales du sein : incidence des biofilms bactériens sur l'évolution des plaies et le développement d'odeurs." Phd thesis, Université de Cergy Pontoise, 2012. http://tel.archives-ouvertes.fr/tel-00838471.

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La plaie tumorale est une infiltration par des cellules tumorales du tissu cutané, des vaisseaux sanguins et/ou lymphatiques. Ces plaies peuvent se présenter sous des aspects très différents accompagnés de symptômes variés. Outre les risques d'infection locale, les odeurs nauséabondes posent des problèmes récurrents d'isolement social, de difficultés conjugales et entrainent une sensation de dégout, de pourriture, voire de mort imminente. Elles influencent même le comportement médical. La colonisation bactérienne, les odeurs et les risques infectieux semblent intimement liés chez ces patients

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Lo, Vanessa, and Erik Pettersson. "Elektrolyserat vatten som desinfektionsmedel i restaurangkök." Thesis, Örebro universitet, Restaurang- och hotellhögskolan, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-84910.

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Fechner, Lise. "Acquisition de tolérance et modification de structure des communautés périphytiques : une réponse précoce à la pression urbaine dans les milieux aquatiques." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00596853.

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La contamination des milieux aquatiques urbains se caractérise aujourd'hui par un mélange de micropolluants d'origines et de types variés. Les conséquences de ce type de contamination, multiples mais faibles et chroniques, sur les écosystèmes aquatiques sont difficiles à évaluer. En effet, il est difficile d'une part de dresser un état des lieux précis de la contamination et d'autre part, de relier cette contamination à la réponse biologique des organismes exposés puisqu'elle n'engendre pas nécessairement des effets visibles et immédiats. Cette étude a pour objectif de développer une méthodolo

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