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Dissertations / Theses on the topic 'Potential Microorganisms'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Pohanka, Anton. "Antifungal antibiotics from potential biocontrol microorganisms /." Uppsala : Department of Chemistry, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200647.pdf.

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2

Lyons, Laura Francis. "Bioprospecting for microorganisms and enzymes with biorefining potential." Thesis, Aberystwyth University, 2015. http://hdl.handle.net/2160/21abce27-49d0-4bcc-8196-cae9f79c8383.

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The rise of biorefining and application of biotechnology to combat climate change and accomplish energy security is a necessity. There have already been steps to produce sustainable biofuels and products throughout the world. However, not all processes are economically viable due to costs of enzymes, pre-treatments, and scale-ups. In this project Miscanthus sp. was the main source of bacterial isolation due to its bioenergy characteristics as a low-input high-output crop. Specifically, due to the high sugar content of harvested senesced Miscanthus. The aim of this project was to discover novel

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3

ZEAITER, ZAHRAA. "TOWARDS THE BIOTECHNOLOGICAL EXPLOITATION OF MARINE MICROORGANISMS: INVESTIGATION ON CULTIVATION, PRESERVATION AND GENETIC MANIPULATION." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/170815.

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Capaci di colonizzare habitat variegati ed eterogenei e di stabilire interazioni con piante e animali, i microrganismi rappresentano la forma di vita più abbondante e diversa presente sul nostro pianeta. In particolare, i microrganismi marini sono considerati un interessante reservoir di diversità genetica e funzionale, i cui prodotti potrebbero essere sfruttati in molti settori industriali, come, ad esempio, la produzione di composti naturali bioattivi, agenti farmaceutici o enzimi. Tuttavia, a causa della mancanza di efficienti metodi di isolamento e/o di coltivazione, la maggior parte di es

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4

Megaw, Julianne. "Investigating the biotechnological potential of halophilic and halotolerant microorganisms isolated in Northern Ireland." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675435.

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Halophilic and halotolerant microorganisms are known to have numerous potential biotechnological applications, but to date, they have been largely underexploited in comparison to other extremophiles. The overall aim of the research presented within this thesis was to further investigate some of the biotechnologically useful products and processes that halophilic and halotolerant microorganisms are known to possess. Firstly, halotolerant bacterial isolates from a polluted marine environment were shown to be extremely tolerant to l-alkyl-3-methylimidazolium chloride ionic liquids, with much grea

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Tarverdi, Karnik. "Preparation and testing of lanthanum and neodymium with 8-hydroxyquinoline as potential biocide." Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332067.

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Al-Yousef, Sulaiman Ali. "Bismuth : effects on pathogenic microorganisms and its potential impact on microbial processes in the environment." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246923.

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7

Low, Chee Kin Andrew. "Characterisation and evaluation of novel potential target (tubulin) for antimalarial chemotherapy." Thesis, Low, Chee Kin Andrew (2004) Characterisation and evaluation of novel potential target (tubulin) for antimalarial chemotherapy. PhD thesis, Murdoch University, 2004. https://researchrepository.murdoch.edu.au/id/eprint/165/.

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Malaria has long affected the world both socially and economically. Annually, there are 1.5-2.7 million deaths and 300-500 million clinical infections (WHO, 1998). Several antimalarial agents (such as chloroquine, quinine, pyrimethamine, cycloguanil, sulphadoxine and others) have lost their effectiveness against this disease through drug resistance being developed by the malarial parasites (The- Wellcome-Trust, 1999). Although there is no hard-core evidence of drug resistance shown on the new antimalarial compounds (artemisinin and artesunate), induced resistant studies in animal models have d

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8

Low, Chee Kin Andrew. "Characterisation and evaluation of novel potential target (tubulin) for antimalarial chemotherapy /." Access via Murdoch University Digital Theses Project, 2004. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20050930.125714.

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9

Geesink, Patricia [Verfasser], Kirsten [Gutachter] Küsel, Miriam [Gutachter] Rosenbaum, and Rainer [Gutachter] Meckenstock. "Interactions and metabolic potential of groundwater microorganisms / Patricia Geesink ; Gutachter: Kirsten Küsel, Miriam Rosenbaum, Rainer Meckenstock." Jena : Friedrich-Schiller-Universität Jena, 2020. http://d-nb.info/1213758688/34.

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10

Fuqua, Andrew. "Characterization of the Broad-spectrum Inhibitory Capability of Alcaligenes faecalis and A. viscolactis against Potential Pathogenic Microorganisms." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/honors/546.

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The recent rise of multidrug resistant microorganisms has grown from an isolated concern to a massive public health crisis. It has become imperative that scientists look for new ways to combat this issue. Due to the selective pressures of competition, bacteria and other microbes possess a host of defenses and weapons designed to exploit vulnerabilities in other microorganisms. Consequently, the study of these systems and microbial interactions has much to reveal in the search for novel antimicrobial treatments. Previous research from our laboratory has discovered that both Alcaligenes faecalis

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11

McKenzie, Karen. "Inactivation of foodborne pathogenic and spoilage microorganisms by 405 nm light : an investigation into potential decontamination applications." Thesis, University of Strathclyde, 2014. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25656.

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The control of microbial contamination in the food industry is critical, as contamination of food produce, surfaces and equipment can lead to acquisition of foodborne infections. Microbial contamination can also result in food spoilage, which can cause both product and financial loss. Consequently novel decontamination technologies are being sought to help reduce contamination. Initial investigations examined the efficacy of 405 nm light for inactivation of a range of common foodborne microorganisms, both in suspension and on agar surfaces. All exposed populations were significantly reduced fo

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12

Mpama, Nelisa. "Assessing the potential role of microorganisms in the production of seedlings for the restoration of Albany Thicket." Thesis, Rhodes University, 2017. http://hdl.handle.net/10962/64555.

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13

Piotrowska, Agnieszka Anna. "Investigation of STM3071 as a potential regulator of cobalt transport in Salmonella enterica." Thesis, Edinburgh Napier University, 2018. http://researchrepository.napier.ac.uk/Output/1253543.

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Using bioinformatics we have identified stm3071 as a possible regulator of anaerobically induced genes involved in metal homeostasis (Price-Carter et al., 2001) and the aim of this study is to determine the function of stm3071 and define the conditions that induce its expression. Cobalt is required for incorporation into cobalamin (vitamin B12) which is important during S. Typhimurium infection. Vitamin B12 is synthesised de novo under anaerobic conditions and is required for metabolism of 1,2-propanediol and ethanolamine which act as sources of carbon and nitrogen when Salmonella is in the gu

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14

Plaimas, Kitiporn [Verfasser], and Roland [Akademischer Betreuer] Eils. "Computational Analysis of the Metabolic Network of Microorganisms to Detect Potential Drug Targets / Kitiporn Plaimas ; Betreuer: Roland Eils." Heidelberg : Universitätsbibliothek Heidelberg, 2011. http://d-nb.info/1179783042/34.

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[Verfasser], Kitiporn Plaimas, and Roland [Akademischer Betreuer] Eils. "Computational Analysis of the Metabolic Network of Microorganisms to Detect Potential Drug Targets / Kitiporn Plaimas ; Betreuer: Roland Eils." Heidelberg : Universitätsbibliothek Heidelberg, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:16-opus-128889.

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Pinheiro, Dutra Rulli Mayra. "Changes in nutrient levels influence freshwater microbial communities and their potential for chitin degradation." Thesis, Uppsala universitet, Institutionen för ekologi och genetik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353835.

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Microorganisms are of great importance for the large scale elemental cycles and overallfunctioning of most natural ecosystems, and this also includes the ecology and maintenance offreshwater resources. Anthropogenic actions as well as climate change has greatly affectedfreshwaters and it is therefore important to understand how microorganisms react to suchenvironmental changes. I investigated how one such pressure, increased nutrient levels,influenced freshwater microbial communities and their potential to degrade the globallyabundant biopolymer chitin. To assess the effects of changed nutrien

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Dellagnezze, Bruna Martins 1984. "Avaliação do potencial de microbiota originada de reservatórios de petróleo para biorremediação = Evaluation of bioremediation potential of microorganisms from petroleum reservoirs." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317335.

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Orientadores: Valéria Maia Merzel, Suzan Pantaroto de Vasconcellos<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-26T20:16:20Z (GMT). No. of bitstreams: 1 Dellagnezze_BrunaMartins_D.pdf: 5318956 bytes, checksum: ea46ea243dab1c96e35480b724029b55 (MD5) Previous issue date: 2015<br>Resumo: A poluição é um problema mundial amplamente discutido, incluindo os derramamentos de petróleo ocorridos através de acidentes ou por atividades humana, os quais acarretam grande impacto ambiental e econômico. O processo de biorremediação ut

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18

Kikine, Tshepo Neo Ferdinard. "Profiling of potential pathogens from Plankenburg river water used for the irrigation of fresh produce." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18095.

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Thesis (MSc Food Sc)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: The increased consumption of fresh produce has been shown to be related to increases in foodborne disease outbreaks and these have in many cases been ascribed directly to carry-over of pathogens from contaminated irrigation water. In South Africa, rivers are the main source of irrigation water but many have been found to be unsuitable for irrigation of fresh produce because of the unacceptably high levels of faecal contamination. The main aim of this study was to do a baseline evaluation of the microbiological quali

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Ferreira, Joana Teles. "Ruthenium phythalocyanines as potential photosensitizers for singlet oxygen generation." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22727.

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Doutoramento em Química<br>A Terapia Fotodinâmica combina luz, oxigénio molecular e um fotossensibilizador para a produção de espécies reativas de oxigénio, como 1O2 e radicais livres, os quais vão induzir stress oxidativo e, eventualmente, morte celular. Isto permite assim a destruição de células tumorais de uma forma não invasiva, seletiva e localizada, com efeitos secundários reduzidos. As ftalocianinas são compostos promissores para serem aplicados como fotossensibilizadores na produção de oxigénio singleto. No entanto, um inconveniente destes compostos é a sua reduzida solubilidade em mei

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20

Hoffmann, Constanze [Verfasser]. "Fly-based wildlife disease surveillance in remote tropical habitats - two exemplary targeted microorganisms with zoonotic potential: Bacillus cereus biovar anthracis and adenoviruses / Constanze Hoffmann." Berlin : Freie Universität Berlin, 2018. http://d-nb.info/116983213X/34.

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21

Ioppolo, Antonino. "Valorization of Citrus spp. Cultivars cultivated in Sicily for the industrial use of citrus derivatives and in particular for potential alternative uses of essential oils for the enhancement of the island's citrus production." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/159385.

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[ES] En esta tesis doctoral se discuten una serie de cuestiones científicas relacionadas con a la producción y el procesamiento de algunas especies de cítricos de especial relevancia en Sicilia y en el área mediterránea. Los objetivos se centran en estudiar la trazabilidad y sostenibilidad de la producción de algunas especies de cítricos, así como encontrar nuevas aplicaciones a los subproductos y productos de desecho de la industria, con el fin de mejorar su rentabilidad. Por lo tanto, los temas que se desarrollarán serán los siguientes: caracterización de los compuestos bioactivos presentes

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22

Alves, Maurício Marcelino de Sousa. "Potencial biotecnológico de bactérias e leveduras isoladas da casca do Coco-verde (Cocos Nucifera) em fermentação." Universidade Federal de Alagoas, 2017. http://www.repositorio.ufal.br/handle/riufal/1900.

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The culture of coconut is economically relevant to Brazil but suffers with the breeding of pests that target coconut trees and bring on economic losses. One of the pests responsible for such is the palm weevil R. palmarum L., which is attracted to the infestation site by the odor released from the fermentation of plant tissues. This is particularly problematic when the crop, processing and disposal sites are in close location, for the residue discarded (i.e. green coconut shell) undergoes the action of microorganisms that produce volatile compounds and attract the pest to the crop site. This r

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23

Heumann, Jan H. "The potential role of ABC transporters as factors influencing drug susceptibility in the salmon louse, Lepeophtheirus salmonis (Kroyer, 1837)." Thesis, University of Stirling, 2014. http://hdl.handle.net/1893/21812.

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Efficient control of sea lice is a major challenge for the sustainable production of farmed Atlantic salmon (Salmo salar (Linnaeus, 1758)). These marine ectoparasites feed on mucus, skin and blood of their hosts, thereby reducing the salmon’s growth rate and overall health. In the northern hemisphere, the most prevalent species is Lepeophtheirus salmonis (Krøyer, 1837). In 2006, global costs of sea lice infections are estimated to have exceeded €300 million, with the majority spent on a limited number of chemical delousing agents. Emamectin benzoate (EMB; SLICE®), an avermectin, has been widel

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Cazaudehore, Guillaume. "Méthanisation des plastiques biodégradables : performances et diversité microbienne." Electronic Thesis or Diss., Pau, 2022. http://www.theses.fr/2022PAUU3002.

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L'impact environnemental des plastiques conventionnels conduit à un développement et à un déploiement de matériaux alternatifs comme les plastiques biodégradables. Ces plastiques biodégradables ont pour avantage, par rapport aux plastiques conventionnels, de pouvoir être traités en filière de recyclage organique (méthanisation ou compostage). Cependant, l'étude de la fin de vie des plastiques biodégradables en méthanisation en est encore à ses débuts. Par conséquent, l'objectif de cette thèse est d'étudier le devenir de ces matériaux en digestion anaérobie (DA) mésophile et thermophile, leurs

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Novak, Alessandra Cristine. "Evaluation of the cosmetic potential of the Cyanobacterium Spirulina platensis." reponame:Repositório Institucional da UFPR, 2013. http://hdl.handle.net/1884/30385.

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Abstract: Toiletry, Perfumery and Cosmetics Sector (TPCS) occupies a prominent place in modern society. The search for beauty and wellness, combined with increased life expectancy of the population, causes the intensive search to products that improve appearance, hygiene and health. Thus, the development of cosmetics is very stimulated. Another important feature is the continuously pressure from consumers and companies to this development of new and innovative products, raising competitiveness. Based on this, large sums are being annually invested in this area. Innovation is the world in cosm

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Ali, Mujahid. "Influence of organic matter on CO2 and H2 wettability of petroleum reservoirs." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2617.

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Carbon geo sequestration (CGS) is considered one of the promising approaches to reducing anthropogenic greenhouse gas emissions into the environment. Furthermore, Underground Hydrogen Storage (UHS) has been also identified as a viable solution to effectively stored hydrogen in geological formations. The underground storage of hydrogen (UHS) project has the potential to overcome the supply and demand imbalance by a subsequent withdrawal during periods of renewable energy shortage. Depleted petroleum reservoirs and deep saline aquifers are considered favorable candidates for long-term H2 and CO2

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Lucht, Lisa Michelle. "Radiation responses of foodborne microorganisms, recovery from potentially lethal radiation damage." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq23395.pdf.

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Zanella, Janice de Fátima Pavan. "Acanthamoeba spp. em ambientes hospitalares e acadêmicos do Rio Grande do Sul." reponame:Repositório Institucional da UCS, 2011. https://repositorio.ucs.br/handle/11338/693.

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Protozoários do gênero Acanthamoeba estão entre os organismos de vida-livre mais abundantes sendo encontrados em uma ampla gama de ambientes naturais como água, solo, poeira, vegetais, hospitais, sistemas de ventilação e esgotos. Algumas espécies de Acanthamoeba são consideradas patógenos oportunistas e têm sido associadas a infecções cutâneas, queratite, encefalite granulomatosa amebiana (EGA) e a outras afecções em menor frequência. O objetivo do presente trabalho foi avaliar a presença de Acanthamoeba em áreas comunitárias de unidades acadêmicas e hospitalares, assim como determinar o

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Sibanda, Thulani. "Assessment of antibacterial potentials of Garcinia Kola seed extracts and their interactions with antibiotics." Thesis, University of Fort Hare, 2007. http://hdl.handle.net/10353/71.

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The antibacterial potency of the extracts of the seed of Garcinia kola (bitter kola) was investigated in this study against a panel of referenced, environmental and clinical bacterial strains. The killing rates of the active extract as well as their potential for combination antibacterial therapy with standard antibiotics were also elucidated using standard procedures. The aqueous and acetone extracts of the seed were screened for activity against 27 bacterial isolates. The aqueous extract exhibited activity mainly against Gram positive organisms with Minimum inhibitory concentration (MIC) val

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Cappellin, Catherine Brooks. "Locational and temporal patterns in microorganisms potentially affecting water quality in the Dan River system." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93501.

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River ecosystems across the US and globally face numerous stressors that impact both ecological function and water quality. In 2015-16, municipalities along the Dan River in southern Virginia experienced repeated taste and odor (TandO) issues in their drinking water that originated from the river source water. Given that the source of TandO issues during these events were unknown, this research aimed to identify patterns in the distributions of river microorganisms that could help identify potential biological causes. Monthly water, sediment, and periphyton samples were collected for a full ye

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Henley-Smith, Cynthia Joan. "Identification of bioactive compounds of a South African plant extract for combating potentially pathogenic oral microorganisms." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/31149.

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Seven plants generally used for traditional oral care namely, Barleria albostellata, Cotyledon orbiculata, Dichrostachys cinerea, Heteropyxis natalensis, Carpobrotus edulis, Zanthoxylum capense and Dodonaea viscosa were investigated for antimicrobial activity and safety. Four pathogenic microorganisms, Actinomyces israelii, Streptococcus mutans, Prevotella intermedia and Candida albicans, were selected that represented the diversity of microbial flora in the oral cavity. No evidence could be found in the literature on the activity of the selected plant extracts against A. israelii, P. interme

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Pascaud, Alice. "Bioindicateurs microbiens et biosurveillance des agrosystèmes : cas des sols viticoles." Bordeaux 2, 2007. http://www.theses.fr/2007BOR21491.

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L'évaluation de l'état biologique des sols est un élément important de jugement de la durabilité des agrosystèmes et des pratiques culturales. Au sein du sol, les micro-organismes représentent des sources potentielles de bioindicateurs/biomarqueurs, permettant la construction de cet indicateur. L'objectif de ce travail est de déterminer parmi les paramètres microbiens caractéristiques de la taille, de l'activité et de la diversité des communautés microbiennes naturelles, des indicateurs les plus susceptibles de donner lieu à des analyses de routine ainsi que leurs domaines de variabilité natur

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ASTARITA, ENRICO. "Assessing the diversity of microbial assemblages and their bioremediation potential of chronically contaminated marine sediments." Doctoral thesis, Università Politecnica delle Marche, 2022. https://hdl.handle.net/11566/299852.

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Il fenomeno della contaminazione chimica dei sedimenti marini costieri è molto diffuso e rappresenta una grande preoccupazione per il benessere della biodiversità e dell’ecosistema. Il biorisanamento è una strategia ecocompatibile che sta ottenendo sempre più attenzione grazie al suo potenziale di ripulire sedimenti marini contaminati. In questa tesi di dottorato, prima di tutto, ho fornito una panoramica delle attuali conoscenze e prospettive sul biorisanamento di sedimenti marini, presenti in letteratura. Quindi ho valutato la diversità degli assemblaggi microbici in diversi sedimenti cronic

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PINARD, EMMANUEL, and Andrée Marquet. "Relations plantes-microorganismes : synthese asymetrique de la (+) pisatine et d'analogues, inhibiteurs potentiels de la pisatine demethylase." Paris 6, 1992. http://www.theses.fr/1992PA066294.

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Les phytoalexines, substances fongitoxiques, synthetisees par les plantes a la suite d'une attaque fongique, peuvent etre detoxifiees enzymatiquement par les champignons pathogenes. Notre but est de savoir si cette pathogenicite est anihilee lorsque la detoxification est bloquee au moyen d'inhibiteurs. Nous avons choisi d'etudier le pois dont la degradation de la phytoalexine, la (+) pisatine, par son champignon pathogene, nectria haematococca, est une demethylation qui met en jeu une monooxygenase a cytochrome p450. Les inhibiteurs de cette enzyme que nous avons choisis sont de type pterocarp

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Hernández, Galán Leticia. "Potentiel des écosystèmes microbiens fromagers pour la formation de peptides bioactifs, et effets dûs aux matrices laitières sur la survie des microorganismes d´intérêt fromager au cours de la digestion." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLA015.

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Cette thèse eu deux objectifs: A) Déterminer la présence de peptides bioactifs avec des activités antioxydantes ou inhibitrices d´enzyme de conversion de l'angiotensine (ECA) dans les fromages mexicains. B) Observer l'effet de la composition et de la structure de matrices laitières dans la survie des microorganismes laitières pendant la digestion. Les fromages ont été analysés séparément: fromage Cotija, affiné 6 mois et fromage de chèvre frais (non affiné) produit à partir de lait cru et pasteurisé. L´activité antioxydante a été plus élevé dans les fractions contenant des petits peptides. Le

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Nguyen, Bao Loc. "Etude du potentiel d'adaptation et/ou de la destruction de microorganismes contaminants des environnements industriels par la technologie athermique de lumière pulsée." Rouen, 2013. http://www.theses.fr/2013ROUES023.

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Dans ce travail, nous avons étudié les mécanismes d’inactivation et la réponse adaptative des deux modèles bactériens face à la Lumière Pulsée (LP). L’impact de la LP sur la qualité microbiologique et organoleptique des matrices alimentaires a également été évalué. Nous avons montré que P. Flourescens est plus résistant à la LP que B. Subtilis. Toutefois, B. Subtilis s’adapte mieux à un traitement létal LP lorsqu’elle est prétraitée avec une dose sublétale, mais elle ne mute pas dans ces conditions LP. En revanche, P. Flourescens ne présente pas d’adaptation, mais elle mute lorsqu’elle est tra

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Ouvry, Ariane. "Effets du potentiel d'oxydoréduction sur le comportement de deux microorganismes de contamination des produits alimentaires assaisonnés : Escherichia coli et Lactobacillus plantarum." Dijon, 2001. http://www.theses.fr/2001DIJOS021.

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Traon, Florian. "Étude de l'adhésion de diatomées benthiques et du potentiel antifouling de zéolites chargées en cuivre." Electronic Thesis or Diss., Lorient, 2021. http://www.theses.fr/2021LORIS592.

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Le développement du biofouling sur les infrastructures anthropiques est un problème permanent causant des dégâts économiques et environnementaux. Ce phénomène causé par divers niveaux trophiques commence généralement par l’étape du microfouling, constitué majoritairement de bactéries et microalgues, puis celui du macrofouling représenté par l’établissement de macroalgues et mollusques. Afin de lutter contre ces salissures, le développement de stratégies antifouling est crucial. Récemment, la pollution causée par ces revêtements a relancé la recherche pour trouver des systèmes efficaces tout en

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Lam, Kin-San, University of Western Sydney, and School of Science. "Biodegradation of xanthate by microbes isolated from a tailings lagoon and a potential role for biofilm and plant/microbe associations." THESIS_XXXX_SS_Lam_K.xml, 1999. http://handle.uws.edu.au:8081/1959.7/441.

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Xanthates, key compounds used in the mining industry for the separation of metals from ores, may have a significant impact on the ecosystems once discarded into the tailings. The aims of this study were to : characterize chemical and microbiological conditions in a tailings lagoon (Brown Creek gold mine); examine the feasability of using indigenous bacteria to degrade xanthate under laboratory conditions; and, optimize the biodegradation process by employing biofilm technology and plant-microbe associations. To achieve these, a simple but accurate HPLC method was developed. The chemical and bi

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Belkacem, Mohamed Amine. "Identification chimique de métabolites secondaires de certains microorganismes, évaluation de leur effet dans les domaines pharmaceutiques et agronomiques." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30293/document.

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Au cours de ce travail de thèse intitulé " Identification chimique de métabolites secondaires de certains microorganismes, évaluation de leurs effets dans les domaines pharmaceutiques et agronomiques ", nous nous sommes intéressés à l'étude des effets des conditions de culture sur la production des composés organiques volatils microbiens à partir de deux souches bactériennes co-existantes dans le sol Français : Burkholderia sp. et Bacillus megaterium. A partir des différents extraits préparés, plus que cent composés ont été identifiés, comprenant les dicétopipérazines, les alcools, les composé

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Ducasse-Lapeyrusse, Jean. "Étude du potentiel d'autocicatrisation et de biocicatrisation de matériaux cimentaires fissurés." Electronic Thesis or Diss., Lille 1, 2014. http://www.theses.fr/2014LIL10144.

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Les bactéries peuvent favoriser la formation de calcite. Leur utilisation au sein des matériaux cimentaires permettrait de colmater des fissures avec ce produit compatible et durable. L'objectif principal de cette thèse est de comprendre les mécanismes de la biocicatrisation des matériaux cimentaires afin d’accélérer la cinétique et maximiser le colmatage de fissures importantes (>200 µm). L'approche de biocicatrisation étudiée consiste à imprégner les fissures à l'aide d'un milieu de culture (milieu précurseur) contenant des bactéries. 3 aspects sont étudiés : les mécanismes abiotiques de

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Ducasse-Lapeyrusse, Jean. "Étude du potentiel d'autocicatrisation et de biocicatrisation de matériaux cimentaires fissurés." Thèse, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/6063.

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La fissuration dans les matériaux cimentaires est un paramètre clé pour la durabilité des structures. L'impact des fissures sur la longévité est complexe du fait notamment de leur possible évolution durant la vie de l'ouvrage. L'autocicatrisation est un des mécanismes qui influent sur les changements de géométrie et de propriétés de transport dans les fissures. L'autocicatrisation se définit comme le rétablissement de certaines propriétés physiques et mécaniques des matériaux cimentaires placés dans un environnement favorable (température et humidité). Pour accélérer le processus naturel d'aut

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Berkelund, Linn. "Nitrifierande mikrobiella samhällen som indikatorer för förorenad jord : Jämförelse av den genetiska och funktionella potentialen." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-356973.

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I Sverige finns det ungefär 25 000 riskklassade förorenade områden samt ännu fler områden som potentiellt är förorenade. Naturvårdsverket har tagit fram generella riktvärden för olika förorenade ämnen. Halter över riktvärdena antyder att risken för negativa effekter på människan eller miljön bedöms vara stor och att efterbehandling av området är aktuellt. Ett vanligt, men kostsamt efterbehandlingsalternativ är urschaktning och bortforsling av jord innehållandes halter av ämnen över riktvärdena. Ett intresse finns för att utveckla lätt tillämpbara metoder för platsspecifik riskbedömning av mark

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Lopes, Paulo Renato Matos [UNESP]. "Degradação fotocatalítica de efluente simulado de refinaria de petróleo e monitoramento de sua toxicidade com microrganismos." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/95002.

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Made available in DSpace on 2014-06-11T19:27:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-08-27Bitstream added on 2014-06-13T19:56:04Z : No. of bitstreams: 1 lopes_prm_me_rcla.pdf: 1045225 bytes, checksum: 8dbfcc24e7204a8d46227309e36b3b87 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O interesse científico e comercial pela catálise ambiental expandiu-se significativamente, nos últimos anos, devido ao aumento contínuo das restrições legais sobre a qualidade das emissões. Cada vez mais, surgem demandas pelo desenvolvimento de tecnologias de tratam

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Pontes, Rita Martins. "Certificação ISO 22000 : validação de medidas de controlo em produção de pastelaria salgada." Bachelor's thesis, Universidade Técnica de Lisboa. Faculdade de Medicina Veterinária, 2010. http://hdl.handle.net/10400.5/2265.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>A validação das medidas de controlo é um passo indispensável no desenvolvimento de um sistema de gestão da segurança dos alimentos, uma vez que é através do processo de validação que se demonstra que as medidas de controlo seleccionadas são efectivamente capazes de atingir o nível pretendido de controlo dos perigos. De entre os vários microrganismos que podem estar presentes nas diferentes matérias-primas utilizadas no fabrico de produtos de pastelaria salgada, aqueles que mais frequentemente causam doenças com origem alimentar

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Mariotto, Christian. "Production d'acides organiques a partir de substrats monocarbones par eubacterium limosum." Toulouse, INSA, 1988. http://www.theses.fr/1988ISAT0023.

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Le metabolisme de la fermentation du methanol par eubacterium limosum est regule par la quantite d'equivalents reducteurs produits par la dissimilation du methanol. L'optimisation de la production d'acide butynique passe par ce flux de dissimilation. L'utilisation de la fermentation avec ajouts de substrats permet d'obtenir un titre maximal en acide butynique, et celle du couplage ultrafiltration-fermentation procure les valeurs maximales de la productivite en acide butynique

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Lam, Kin-San. "Biodegradation of xanthate by microbes isolated from a tailings lagoon and a potential role for biofilm and plant/microbe associations." Thesis, View thesis, 1999. http://handle.uws.edu.au:8081/1959.7/441.

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Xanthates, key compounds used in the mining industry for the separation of metals from ores, may have a significant impact on the ecosystems once discarded into the tailings. The aims of this study were to : characterize chemical and microbiological conditions in a tailings lagoon (Brown Creek gold mine); examine the feasability of using indigenous bacteria to degrade xanthate under laboratory conditions; and, optimize the biodegradation process by employing biofilm technology and plant-microbe associations. To achieve these, a simple but accurate HPLC method was developed. The chemical and bi

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Izuchukwu, Ngozi O. "Studies on the microbiology of fish and shellfish with emphasis on bacteriocin-like substances to control Listeria monocytogenes." Thesis, University of Stirling, 2015. http://hdl.handle.net/1893/23198.

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Seafood permits the transmission of many bacterial pathogens. In order to reconcile consumer demands with important safety standards, traditional means of regulating microbial spoilage and safety hazards in foods are combined with novel technologies. These include biological antimicrobial systems, such as the use of lactic acid bacteria (LAB) and/or their bacteriocins, such as Carnobacterium maltaromaticum CS526 and its bacteriocin piscicocin CS526. The aims of this study were to investigate the presence of Listeria monocytogenes in temperate seafood, namely fresh and smoked salmon, fresh and

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Jain-Beuguel, Caroline. "Potentiels des poly-hydroxyalcanoates (PHAs) bactériens pour l'encapsulation de molécules à visée thérapeutique." Thesis, Brest, 2018. http://www.theses.fr/2018BRES0095/document.

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Les Poly(HydroxyAlcanoates) (PHA) sont des polymères naturels, biodégradables et biocompatibles, synthétisés par de nombreux organismes, et plus particulièrement des procaryotes. Il existe à ce jour plus de 150 types de monomères de PHA différents, accumulés chez différents genres bactériens, en tant que source d’énergie et de carbone. En effet, les granules de PHA intracellulaires sont produites en réponse à un apport en excès de sources de carbone dans l’environnement (glucides, acides gras…), couplé à une carence en éléments azotés nécessaires à la division cellulaire. De par leur caractère

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Nguyen-Trung, Anh-Thu. "Synthèse d'inhibiteurs potentiels non phosphorylés de la désoxyxylulose phosphate réductoisomérase et étude de la voie de biosynthèse des unités isopréniques chez Acanthamoeba polyphaga." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAF010.

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Synthèse d’inhibiteurs potentiels non phosphorylés de la désoxyxylulose phosphate réductoisomérase et étude de la voie de biosynthèse des unités isopréniques chez Acanthamoeba polyphaga. De nombreux microorganismes pathogènes utilisent la voie du méthylérythritol phosphate (MEP) pour la synthèse des unités isopréniques (IPP et DMAPP). Absente chez l’homme, cette voie constitue une cible de choix pour lutter contre ces microorganismes. La fosmidomycine est un des meilleurs inhibiteurs connus à ce jour de la désoxyxylulose phosphate réductoisomérase (DXR), deuxième enzyme de cette voie. Afin d’a

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