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Tesi sul tema "Microbial populations"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Gilliam, Lucy. "Impact of anti-microbial GM plants on soil microbial populations." Thesis, University of Reading, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485401.

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The environmental risk assessment of GM plants is a fast moving area of science. Much research has focused on developing methods to evaluate potential effects on a range of organisms. Microorganisms play an essential role in many soil processes, with the rhizosphere as the prominent site of microbial activity. There is a general need for protocols to assess the effect of anthropogenic influences, the use of different crops and crop rotation an.d as well as GM plants, on the microbial community within the soil. The rhizosp~eres of three crop plants Brassica napus (Oilseed rape), Triticum aestiv

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2

Driessen, Jennifer Petronella 1973. "Microbial populations as indicators of river 'health'." Monash University, Dept. of Chemistry, 2000. http://arrow.monash.edu.au/hdl/1959.1/8780.

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3

Logeswaran, Sayanthan. "Mapping quantitative trait loci in microbial populations." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/4881.

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Linkage between markers and genes that affect a phenotype of interest may be determined by examining differences in marker allele frequency in the extreme progeny of a cross between two inbred lines. This strategy is usually employed when pooling is used to reduce genotyping costs. When the cross progeny are asexual the extreme progeny may be selected by multiple generations of asexual reproduction and selection. In this thesis I will analyse this method of measuring phenotype in asexual cross progeny. The aim is to examine the behaviour of marker allele frequency due to selection over many ge

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4

VanInsberghe, David(David Stephen). "The eco-evolutionary dynamics of microbial populations." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122422.

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Thesis: Ph. D. in Microbiology Graduate Program, Massachusetts Institute of Technology, Department of Biology, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Microbes have adapted to life in complex microbial communities in a large variety of ways, and they are continually evolving to better compete in their changing environments. But identifying the conditions that a particular microbe thrives under, and how they have become adapted to those condition can be exceedingly difficult. For instance, Clostridium difficile became widely known for being the w

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5

Huber, Julie A. "Phylogenetic and physiological diversity of subseafloor microbial communities at deep-sea seamounts /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/10991.

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6

McCartan, Cecilia. "The assessment of toxicity in environmental microbial populations." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343059.

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7

Healey, David W. (David Wendell). "Phenotypic heterogeneity and evolutionary games in microbial populations." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98544.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Biology, 2015.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 92-96).<br>One of the most interesting discoveries of the last decade is the surprising degree of phenotypic variability between individual cells in clonal microbial populations, even in identical environments. While some variation is an inevitable consequence

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8

Martin, F. Elizabeth. "Analyses of microbial populations associated with carious pulpitis." Connect to full text, 2002. http://hdl.handle.net/2123/4414.

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Thesis (Ph. D.)--Institute of Dental Research, Faculty of Dentistry, University of Sydney, 2002.<br>Title from title screen (viewed Apr. 23, 2009) Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Faculty of Dentistry. Includes bibliography. Also available in print form.

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9

Martinez, Robert J. "Multiscale analyses of microbial populations in extreme environments." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24754.

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Thesis (Ph.D.)--Biology, Georgia Institute of Technology, 2008.<br>Committee Chair: Patricia Sobecky; Committee Member: Ellery Ingall; Committee Member: Jim Spain; Committee Member: Martial Taillefert; Committee Member: Thomas DiChristina.

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10

Martin, Fjelda Elizabeth. "Analyses Of Microbial Populations Associated With Carious Pulpitis." Thesis, The University of Sydney, 2002. http://hdl.handle.net/2123/4860.

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11

Martin, Fjelda Elizabeth. "Analyses of microbial populations associated with carious pulpits." Thesis, The University of Sydney, 2002. http://hdl.handle.net/2123/4414.

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Dental caries continues to be a significant public health problem affecting mankind in many parts of the world. Microbial activities include the progressive localised destruction of teeth that without treatment, would eventually result in infection of the dental pulp and surrounding periapical tissues. Although the bacteria responsible for caries initiation and early caries progression have been extensively studied, the microbiology of dentine caries is reported to show considerable diversity and has not yet been fully identified. Few studies have analysed the microbiology of deep caries or ex

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12

Martin, Fjelda Elizabeth. "Analyses of microbial populations associated with carious pulpits." University of Sydney, 2002. http://hdl.handle.net/2123/4414.

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Doctor of Philosophy<br>Dental caries continues to be a significant public health problem affecting mankind in many parts of the world. Microbial activities include the progressive localised destruction of teeth that without treatment, would eventually result in infection of the dental pulp and surrounding periapical tissues. Although the bacteria responsible for caries initiation and early caries progression have been extensively studied, the microbiology of dentine caries is reported to show considerable diversity and has not yet been fully identified. Few studies have analysed the microbiol

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13

Driscoll, William Wallace. "Social and Asocial Niche Construction in Microbial Populations." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/228457.

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Cooperation presents a major challenge for evolutionary theory: how can competition favor a trait that imposes a cost on the individual expressing it while benefitting another? This challenge has been answered by theory that emphasizes the importance of assortment between individuals that tend to cooperate and those who tend to behave selfishly, or `cheat'. Microbial cooperation remains puzzling, given the generally high genetic and taxonomic diversity of most microbial communities. Many microbial populations rely on shared, beneficial extracellular products for an array of functions in nat

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14

Mashaphu, Nthabiseng. "The microbial composition of a natural methanogenic consortium." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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Wetlands account for approximately 20% of annual global methane emissions. Many wetlands receive inputs of organic matter, nutrients, metals and various toxic compounds from adjacent agricultural and industrial areas. The present study aimed to investigate the microbial composition of a natural methanogenic consortium. A consortium-based molecular approach to study diversity of methanogenic microbial communities in a natural wetland at the primary inflow was used. Key microorganisms of a nethane producing consortium were identified. Extracted high molecular mss DNA ws analysed by PCR combined

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15

Kioroglou, Dimitrios. "Analysis of microbial populations in wines through NGS methodologies." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670208.

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La vinificación es un proceso complejo que involucra varias etapas hasta el embotellado y comercialización del vino. Durante este proceso, la cantidad limitada de nutrientes provoca la competencia microbiana, que resulta en la producción de metabolitos que modulan el producto final del vino. Esta actividad microbiana puede conferir características organolépticas beneficiosas o indeseables a la calidad del vino. En los últimos años, el enfoque principal se ha centrado en la detección y el seguimiento de microorganismos determinados, que supuestamente estropean el vino, y la aplicación de m

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16

Nebe-v, Caron Gerhard. "Analysis of naturally occurring microbial populations from diverse environments." Thesis, Coventry University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323034.

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17

Di, Maiuta Nicola. "Characterisation of mixed microbial populations in white mineral dispersions." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3388/.

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In recent years, the microbiology of white mineral dispersions and the application of microbiocides for their preservation have taken a central role for the producer and user with the aim of maintaining high quality requirements such as brightness, rheological parameters, and odour neutrality. Additionally, new applications of mineral dispersions set to open up markets in food, cosmetics and pharmaceutical applications have aroused the interest in the microbiology of white mineral dispersions. Due to the occurrence of biocide resistant bacteria, technical limitations in the usage of biocides,

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18

Lindberg, Ellinor. "Detection and quantification of subsurface pesticide degrading microbial populations." Kgs. Lyngby : Institute of Environment & Resources, Technical University of Denmark, 2007. http://www.er.dtu.dk/publications/fulltext/2007/MR2007-043.pdf.

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19

Vanichpun, Apinya. "Microbial populations and foodborne pathogens control of Mung bean sprouts." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/28979/.

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The two main objectives in this study were investigating the microbial quality and microbial communities of 'use-by date' Mung bean sprouts by using conventional culture and 16S/18S rDNA PCR-DGGE methods, and evaluating the efficacy of natural antimicrobial substances, chemical disinfectants, and thermal treatments in reducing and inhibiting the growth of the pathogens on mung bean seeds. Retail samples of pre-packed mung bean sprouts were obtained from three retailers in the local area. The microbial quality and communities were evaluated on the 'use-by date'. The highest counts of total aero

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20

Lowery, Nicholas Craig. "Evolutionary and therapeutic consequences of phenotypic heterogeneity in microbial populations." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/22838.

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The historical notion of a microbial population has been of a clonal population of identical swimming planktonic cells in a laboratory flask. As the field has advanced, we have grown to appreciate the immense diversity in microbial behaviors, from their propensity to grow in dense surface-attached communities as a biofilm, to the consequences of social dilemmas between cells, to their ability to form spores able to survive nearly any environmental insult. However, the historically biased view of the clonal microbial population still persists – even when a rare phenotype is investigated, the fo

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21

Arevalo, Philip A. (Philip Alexander). "Horizontal gene transfer as a cohesive force in microbial populations." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113462.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Biology, 2017<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Populations are the central unit of evolution and ecology. In the context of evolution, populations are commonly defined as groups of organisms with a shared gene pool in which adaptive genes can spread freely through natural selection. Ecology takes a less abstract view of populations and conceives of them as members of a single species that occupy the same geographical area. Among sexual eukaryotes, gene pools are easily define

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22

Stanley, Lynn. "A characterization of bacteria populations from two sites /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9924929.

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23

Devine, Carol A. "16S ribosomal DNA analysis of microbial populations associated with hydrocarbon reservoirs." Thesis, University of Aberdeen, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312360.

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The sulphate-reducing bacteria (SRB) are a diverse group of organisms which use sulphate as a terminal electron acceptor and produce the highly toxic gas, hydrogen sulphide. The deleterious effects of this include hydrocarbon reservoir souring, formation damage and microbial corrosion. The SRB are of major economic importance to the oil industry. However, knowledge of the microbial ecology of the deep subsurface remains limited. The aim of this project was to investigate whether organisms are indigenous to the hydrocarbon formation and/or are introduced during drilling operations. A range of m

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24

Harrison, Adrian Briscoe. "Hydrocarbon pollution of soil : effects on microbial populations and biomediation methods." Thesis, University of York, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362025.

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25

Brown, James Robert. "A design framework for self-organised Turing patterns in microbial populations." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607669.

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26

Pardelha, Filipa Alexandra Guerreiro. "Constraint-based modelling of mixed microbial populations: Application to polyhydroxyalkanoates production." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/13111.

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Dissertação para obtenção do Grau de Doutor em Engenharia Química e Bioquímica<br>The combined use of mixed microbial cultures (MMC) and fermented feedstock as substrate may significantly decrease polyhydroxyalkanoates (PHA) production costs and make them more competitive in relation to conventional petroleum-based polymers. However, there still exists a lack of knowledge at metabolic level that limits the development of strategies to make this process more effective. In this thesis, system biology computational tools were developed and applied to PHA production by MMC from fermented sugar ca

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27

Sullivan, Madsen Paul. "Effects of and Influences on Microbial Populations of Missouri Maize Fields." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7706.

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The role of individual soil microorganisms changes over the course of a plant's life - microorganisms that have no discernable role at one developmental stage may affect the plant later in its growth. Traditional analysis of the soil microbiome, which has focused principally on the relative abundances (RA) of individual organisms, may be incomplete, as underlying differences in population size cannot be addressed. We conducted a metagenomic analysis of soil microorganisms from various maize (Zea mays L.) fields at two depths, accompanied by crop yield components, to provide insight into influe

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28

Tayler, Sally. "Composition and activity of bacterial populations found on decaying stonework." Thesis, University of Portsmouth, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304908.

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29

Cadena, Cepeda Marleny Kloepper Joseph. "Assessing soil microbial populations and activity following the use of microbial inoculants effect on disease suppressiveness and soil health /." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Fall/Theses/CADENA_MARLENY_3.pdf.

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30

Schmidt, Jill Lisa. "Spatial ecology of bacteria in surficial marine sediments /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/11058.

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31

Quedeville, Vincent. "Mathematical analysis, modelling and simulation of microbial population dynamics." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0033.

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La physiologie d’organismes unicellulaires est la conséquence d’un métabolisme central dont le bilan entrée-sortie témoigne à la fois de la richesse du milieu de culture des cellules et de leur état propre. Lorsque des bactéries sont cultivées dans un fermenteur biologique alimenté en un point, transportées dans un écoulement turbulent, elles doivent composer avec des gradients de concentration tout au long de leur séjour dans le réacteur. Simuler cette physique dans une démarche de modélisation multi-échelle nécessite de prendre en compte les lois, bien connues, de l’hydrodynamique, mais auss

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32

Mancino, C. F., L. Salo, A. Hayes, I. Pepper, and D. M. Kopec. "The Influence of Effluent Irrigation on Specific Soil Microbial Populations and Parameters." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/215852.

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33

Ike-Izundu, Nnenna Esther. "Interaction between arbuscular mycorrhizal fungi and soil microbial populations in the rhizosphere." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1004021.

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This study examined the rehabilitation potential of AM fungi with organic and inorganic fertilisers under pot and field trial conditions as well as their interaction with rhizospheric organisms and specific functional groups. In addition, the study highlighted the effects of land-use management on AM fungal populations in soil and the mycorrhizal status of some selected plants from one of the study sites. The study focussed on two sites that differ in operational activities and these included a mined area that was to be rehabilitated and a commercial farming site. A pot trial was conducted usi

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34

BERTOLINI, MARTINA. "GROUNDWATER BIOREMEDIATION: MICROBIAL POPULATIONS INVOLVED IN CHLOROETHENES AND BTEX CONTAMINATED AQUIFER PROCESSING." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/809422.

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Groundwater plays an important role in water supply around the world. 2 billion of people use aquifers as drinking water. Consequently, contamination of groundwater has a great social and economic impacts. The use of organisms (microorganisms and plants) to remediate contaminated matrices, called bioremediation, is becoming more and more frequent. These techniques are cheaper than chemical and physical remediation techniques. Chloroethenes, aromatic and aliphatic hydrocarbons are widely contaminant compounds because of their intensive use in industrial activity. It is possible to lower their

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35

Hoekstra, Dirk Tjalling. "Microbial population dynamics in indigenous olive wastewater biofilms." Thesis, Cape Peninsula University of Technology, 2007. http://hdl.handle.net/20.500.11838/829.

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Thesis (MTech (Food Technology))--Cape Peninsula University of Technology, 2007<br>The olive industry in South Africa, although small compared to the rest of the world, is rapidly expanding and producing increased volumes of wastewater on an annual basis that could in future develop into a major environmental problem. Olive mill wastewater (OMWW) and table olive wastewater (TOWW) are characterised by high chemical oxygen demand (COD), biological oxygen demand (BOD) and phenolic content that are toxic to the environment. Due to the nature of olive wastewater (OWW), its irresponsible a

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36

Alonso, Cecilia. "Identity and activity of marine microbial populations as revealed by single cell techniques." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979857090.

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37

Reis, Iolanda Maria da Silva. "Segregated modeling and selection of populations for polyhydroxyalkanoate production by mixed microbial cultures." Master's thesis, Faculdade de Ciências e Tecnologia, 2008. http://hdl.handle.net/10362/9664.

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38

Hiorns, William Dougall. "The design of 16S ribosomal RNA-targeted oligonucleotide probes of detection of natural populations of autotrophic ammonia-oxidising bacteria." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333653.

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39

Friedland, Jolene M. "Effectiveness of treatment and diversity of microbial populations within a constructed wetland treating wastewater." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3741.

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Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains vii, 69 p. : ill. (some col.). Includes abstract. Includes bibliographical references.

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40

MacLean, Roderick Craig. "Adaptive radiation and the evolution of resource specialization in experimental populations of Pseudomonas fluorescens." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85576.

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Understanding the origins of biological diversity is a fundamental goal of evolutionary biology. A large body of theory attributes ecological and genetic diversification to divergent natural selection for resource specialization. This thesis examines adaptive radiation in response to selection for resource specialization in microcosm populations of the asexual bacterium Pseudomonas fluorescens. The general protocol for these experiments is to introduce a clonal population of Pseudomonas into a novel environment and to allow evolution to occur through the spontaneous appearance of novel

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41

Bertram, Janet. "Effects of cow urine and its constituents on soil microbial populations and nitrous oxide emissions." Diss., Lincoln University, 2009. http://hdl.handle.net/10182/1334.

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New Zealand’s 5.3 million strong dairy herd returns approximately 106 million litres of urine to pasture soils daily. The urea in that urine is rapidly hydrolysed to ammonium (NH₄⁺), which is then nitrified, with denitrification of nitrate (NO₃⁻) ensuing. Nitrous oxide (N₂O), a potent greenhouse gas (GHG), is produced via nitrification and denitrification, which are enzyme-catalysed processes mediated by soil microbes. Thus microbes are linked intrinsically to urine patch chemistry. However, few previous studies have investigated microbial dynamics in urine patches. Therefore the objective of

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42

Balzano, Sergio. "The role of microbial populations in the cycling of iron and manganese from marine aggregates." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/168945/.

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Marine aggregates play an important role in the cycling of carbon, nutrients and trace metals. Within aggregates the oxygen depleted by aerobic microbial respiration may not be replaced rapidly, generating anoxic or suboxic microzones. Reduced compounds that are unstable in the oxygenated water column have been previously found associated with marine snow. Therefore, in the experiments described in this thesis, artificial aggregates were made in the laboratory from senescent phytoplankton material and incubated to investigate the role of the associated microbial populations to the biogeochemic

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43

Misson, Benjamin Olivier. "Potentiel toxique et structure génétique de populations de Microcystis en lien avec les différentes phases de son cycle de vie." Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22168/document.

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L‟eutrophisation croissante des écosystèmes aquatiques favorise le développement des cyanobactéries, parmi lesquelles Microcystis est la plus représentée dans les régions tempérées. La capacité de Microcystis à produire une puissante hépatotoxine, la microcystine, est à l‟origine de diverses perturbations écologiques, et de nombreuses nuisances sanitaires. La compréhension des facteurs déterminant la toxicité des efflorescences de Microcystis constitue, de fait, un enjeu majeur des recherches actuelles. Dans ce contexte, l‟objectif premier de ce travail de thèse était d‟étudier la variabilité

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44

Dillard, Joshua Ryan. "Demographics and Transfer of Escherichia coli Within Bos taurus Populations." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1484.

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In the United States, symptoms caused by pathogenic strains of Escherichia coli are on the rise. A major source of these pathogenic strains is the E. coli in the digestive tract of cattle. The purpose of this project was to determine if E. coli are transferred between individuals of the same species and if interspecies transmission is possible. Proximity of cattle was also studied as a contributing factor to the transfer of E. coli. To accomplish this goal, E. coli isolates from cattle and cohabitating ground squirrels were compared through a new method of bacterial strain typing called pyropr

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45

Masur, Deanne Christine. "Microbial and geochemical processes controlling the oxidation and reduction of arsenic in soils." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/masur/MasurD0507.pdf.

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46

Colles, Frances M. "Population structure and dynamics of Campylobacter populations carried by wild birds and chickens reared in a free-range woodland environment." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:3dc7cdfb-29f6-4681-b8db-cb71129cd946.

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Ingestion of contaminated chicken meat is a major cause of Campylobacteriosis in Europe and the USA. The environment, including wild birds, is considered to be an important reservoir for chicken colonization. The aims of this study were to determine the population structure of Campylobacter amongst chicken and wild bird sources on a single farm, and to establish the extent to which genotypes flow between them and ultimately infect humans, using MLST and antigen sequence typing. A pilot study amongst farm animals and wild birds in Lancashire demonstrated that Campylobacter genotypes from human

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47

Olson, M. Brady. "On the population ecology of the toxigenic marine diatom genus, Pseudo-nitzschia : perspectives from the growth and mortality environments /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/10983.

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48

Weldon, Jennifer M. "Correlations between Arsenic in Maine Groundwater and Microbial Populations as Determined by Fluorescent In-Situ Hybridization." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/WeldonJM2005.pdf.

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49

Högberg, Ann. "Cereal non-starch polysaccharides in pig diets : influence on digestion site, gut environment and microbial populations /." Uppsala : Dept. of Animal Nutrition and Management, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a413.pdf.

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50

Fuller, Robert A. "The interactions of toluic acid with indigenous microbial populations in a model Gravel Bed Hydroponic system." Thesis, University of Portsmouth, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310419.

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