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Dissertations / Theses on the topic 'Microbial diversity'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Pagaling, Eulyn. "Microbial diversity of Chinese lakes." Thesis, University of Leicester, 2007. http://hdl.handle.net/2381/7662.

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2

Sanal, Zeynep. "Microbial diversity in evaporite brines." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/29800.

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Studies of subterranean ancient evaporites in different geographical and geological habitats around the world have revealed that these sites are populated by abundant populations of halophilic eubacteria. The diversity of these isolates was established by phenotypic, chemotaxonomic and phylogenetic analyses. The majority of the isolates were Gram-negatives (90%), the remainder being Gram-positives as judged by several different kinds of analyses. A numerical taxonomy study of the Gram-negative isolates revealed nine distinct phenons, whereas the Gram-positive isolates were represented by only

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3

Karlinska-Batres, Klementyna. "Microbial diversity of coralline sponges." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-179567.

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4

O'Flaherty, S. M. "Microbial diversity in contaminated soil." Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274042.

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5

Xue, Peipei. "Soil Microbial Diversity: Relating Microbial Distributions to Soil Functions." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/28830.

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Soil microbial biodiversity is an essential component of the natural ecosystem. Soil microbes work as decomposers contributing to soil nutrient cycling, primary production, and climate regulation. The heterogeneous edaphic properties lead to the diversity of microbial community structuring and functioning. This thesis investigates microbial community distributions and functions through vertical soil profiles, at the landscape level, and along regional transects. Vertically, soil microbial communities were depicted in soil profiles to a depth of 1 m using the concept of genosoils (soil formed a

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6

Baumgarte, Susanne. "Microbial diversity of soda lake habitats." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968508480.

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7

Edlund, Anna. "Microbial diversity in Baltic Sea sediments /." Uppsala : Dept. of Microbiology, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200726.pdf.

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8

Eren, Ahmet. "Assessing Microbial Diversity Through Nucleotide Variation." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/1307.

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Microbes are the most abundant and most diverse form of life on Earth, constituting the largest portion of the total biomass of the entire planet. They are present in every niche in nature, including very extreme environments, and they govern biogeochemical transformations in ecosystems. The human body is home to a diverse assemblage of microbial species as well. In fact, the number of microbial cells in the gastrointestinal tract, oral cavity, skin, airway passages and urogenital system is approximately an order of magnitude greater than the number of cells that make up the human body itself,

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9

Ord, Victoria June. "Modelling microbial diversity in Antarctic soils." Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2726.

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Microorganisms play a crucial role in supporting biodiversity, maintaining marine and terrestrial ecosystems at the crux of the nutrient cycle. They are the most diverse and abundant of all living creatures, yet little is understood about their distribution or their intimate relationship with the environment. Antarctic ecosystems are among the most simple on Earth; with basic trophic structuring and the absence of many taxonomic groups, they are also isolated geographically with small patchy areas of nutrient inputs. In this instance, Antarctica becomes a pristine laboratory to examine the eco

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10

Durbin, Alan Teske Andreas. "Microbial diversity of oligotrophic marine sediments." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2627.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2009.<br>Title from electronic title page (viewed Oct. 5, 2009). "... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Marine Sciences." Discipline: Marine Sciences; Department/School: Marine Sciences.

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11

Ghezzi, Daniele <1989&gt. "Microbial diversity and metabolic potential in caves." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amsdottorato.unibo.it/9467/1/Ghezzi_Daniele_tesi.pdf.

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Caves are dark and oligotrophic habitats where chemotrophic microbial communities interact with the inorganic mineral rocks and cooperate organizing themselves in complex biological formations, which are visible in caves as biofilms, biodeposits or biospeleothems. In these environments, microorganisms contribute to the turnover of the matter and activate peculiar enzymatic reactions leading to the modification of the mineral rocks and to the production of metabolites with possible industrial and pharmaceutical interest. In this PhD thesis, various molecular and geomicrobiological approaches we

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12

Moodley, Kamini. "Microbial diversity of Antarctic Dry Valley mineral soil." Thesis, University of the Western Cape, 2004. http://etd.uwc.ac.za/index.php?module=etd&amp.

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Antarctica provides some of the most extreme environments on earth. Low temperatures, low water availability and nutrient deficiency are contributing factors to the limited colonisation of Antarctic biotopes, particularly in the continental Dry Valleys. The survival of microorganisms in this harsh continent provides the basis for the significance of this study. This study aimed to explore microbial phylotypic diversity across a 500 m altitudinal transect in the Miers Dry Valley, Ross Desert, East Antarctica. The study also attempted to infer from phylogenetic data, the possible presence of ind

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13

Cloete, Melissa. "Microbial diversity of the Namib Desert salt pans." University of the Western Cape, 2015. http://hdl.handle.net/11394/5230.

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>Magister Scientiae - MSc<br>Salt pans are a characteristic feature of many dry deserts. The microbial communities inhabiting salt pans are thought to be particularly complex and are generally dominated by halophilic microorganisms. Although saline pools are frequently found within the hyper-arid Namib Desert, the microbial communities of these saline sites have been scarcely investigated. The aim of the present study was to characterise the archaeal, bacterial and cyanobacterial diversity inhabiting these extreme saline pools using three culture independent molecular techniques (DGGE, T-RFLP

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14

Handley, Kim Marie. "Microbial diversity and respiratory processes in hydrothermal sediment." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492237.

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In marine hydrothermal sediments metal-rich, reduced fluids and oxidised seawater form steep geochemical gradients supporting abundant, but as yet poorly defined, chemosynthetic life and biogeochemical cycling. This project elucidates the functional diversity of chemosynthetic micro-organisms, and metabolic processes on the geochemistry of ferruginous (-50% Fe), arsenic-rich (-400 ppm As) hydrothermal sediment at Santorini, Greece (20-40Ã‚Â°C, pH 6.0-6.3, Eh 0 to 155 mV). Culture and molecular-phylogenetic techniques revealed abundant chemosynthetic prokaryotes capable of transforming a range

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15

Slabbert, Etienne. "Microbial diversity of soils of the Sand fynbos." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/4082.

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Thesis (MSc (Microbiology))--Stellenbosch University, 2008.<br>The soil environment is thought to contain a lot of the earth’s undiscovered biodiversity. The aim of this study was to understand the extent of microbial diversity in the unique ecosystem of the Western Cape’s fynbos biome. It is known that many processes give rise to this immense microbial diversity in soil. In addition the aim was to link microbial diversity with the soils physio-chemical properties as well as the plant community’s structure. Molecular methods especially automated ribosomal intergenic spacer analysis (ARISA) w

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16

Pelz, Kirsten Suzanne. "Mosquito production and microbial diversity in container habitats." Diss., Connect to online resource - MSU authorized users, 2008.

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Thesis (Ph. D.)--Michigan State University. Dept. of Entomology and Program in Ecology, Evolutionary Biology and Behavior, 2008.<br>Title from PDF t.p. (viewed on July 7, 2009) Includes bibliographical references (p. 185-195). Also issued in print.

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17

Sanz, Sáez Isabel. "Contribution of marine heterotrophic cultured bacteria to microbial diversity and mercury detoxification." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/671617.

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Els oceans conten aproximadament un total de 10^29 cèl·lules microbianes. Els bacteris marins són responsables de la major part de la respiració que es produeix en l’oceà i són essencials en els cicles biogeoquímics de la Terra. Estudiar la diversitat bacteriana dels ecosistemes marins i tenir accés als genomes mitjançant estudis dependents o independents de cultiu és important per desxifrar el potencial metabòlic dels bacteris marins. El cultius ens aporten informació sobre la fisiologia bacteriana, ecologia i contingut genòmic, però la majoria dels esforços en aïllar bacteris marins proven

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18

Luo, Chengwei. "Development of algorithms for metagenomics and applications to the study of evolutionary processes that maintain microbial biodiversity." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47730.

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Understanding microbial evolution lies at the heart of microbiology and environmental sciences. Numerous studies have been dedicated to elucidating the underlying mechanisms that create microbial genetic diversity and adaptation. However, due to technical limitations such as the high level of uncultured cells in almost every natural habitat, most of current knowledge is primarily based on axenic cultures grown under laboratory conditions, which typically do not simulate well the natural environment. How well the knowledge from isolates translates to in-situ processes and natural microbial comm

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19

Chatzinotas, Antonis. "Assessing microbial diversity in terrestrial environments using molecular methods /." [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13606.

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20

Wang, Chunxiao. "New approaches to estimate microbial diversity of alcoholic fermentation." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/387309.

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La fermentació alcohòlica la realitza una comunitat microbiana complexa, on els llevats vínics juguen un paper important. En els darrers anys, hi ha hagut un creixent interès per millorar complexitat del vi mitjançant fermentacions controlades quer utilitzaven no només S. cerevisiae sinó també soques seleccionades de llevats no-Saccharomyces. La investigació sobre la viabilitat dels llevats i les interaccions tenen un paper fonamental per entendre la diversitat de llevats en la fermentació mixta. En aquesta tesi, les tècniques independents de cultiu que es van aplicar per a l'anàlisi directa d

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21

Friedline, Christopher J. "Phylometagenomics: a new framework for uncovering microbial community diversity." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/499.

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Microbial communities are recognized as major drivers of global biogeochemical processes. However, the genetic diversity and composition, as well as processes leading to the origin and diversification of these communities in space and time, are poorly understood. Character- ization of microbial communities using high-throughput sequencing of 16S tags shows that Operational Taxonomic Unit (OTU) abundances can be approximated by a gamma distribu- tion, which suggests structuring around small numbers of highly abundant OTUs and a large proportion of rare OTUs. The current methods used to characte

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22

Randima, Livhuwani Priscilla. "Rhizosphere microbial diversity in PAH's contaminated and uncontaminated soil." Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-11302009-195201/.

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23

Lutz, Stefanie. "The microbial diversity and function of Arctic supraglacial biomes." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/11871/.

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The main aim of this research project was to improve our understanding of the diversity, function and ecology of glacial microbiomes. Snow and ice algae are critical players in supraglacial habitats and form extensive blooms in spring and summer. Here I present results on the diversity and the function of snow and ice algae on 21 glaciers in 4 Arctic settings: Greenland, Iceland, Svalbard and Sweden. For the first time, I have evaluated the full microbial community composition (i.e., algae, bacteria, archaea) in the main supraglacial habitats, namely green snow, red snow, biofilms, dirty ice,

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24

Tangherlini, Michael. "Microbial diversity and gene flow in deep-sea sediments." Doctoral thesis, Università Politecnica delle Marche, 2014. http://hdl.handle.net/11566/242906.

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La metagenomica ha permesso lo studio della diversità degli organismi non coltivabili e il loro ruolo nei vari ecosistemi tra cui suoli e sedimenti marini. acque interne e di oceano aperto. L’analisi della diversità attraverso gli approcci metagenomici è basata sull’estrazione del DNA genomico assumendo che questo sia completamente associato a biomassa vivente. Tuttavia, recenti studi hanno dimostrato che il metagenoma completo di ogni campione ambientale è costituito da pool differenti, tra cui: ,quello dei virus, quello associato a biomassa microbica e quello associato a biomassa non v

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25

Araújo, Solange Pires de. "Produção de inóculo microbiano, obtido de macrófitas aquáticas na Amazônia, com potencial de degradação de hidrocarbonetos de petróleo." Universidade Federal do Amazonas, 2014. http://tede.ufam.edu.br/handle/tede/4307.

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26

Howarth, Richard. "Diversity and function of morphologically conspicuous sulfide-oxidising bacteria." Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287821.

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27

Carder, Phyllis. "Microbial Communities of Spinach at Various Stages of Plant Growth From Seed to Maturity." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/34104.

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<p>Little is known about how the leaf bacterial community is affected by the seed microbiota at different stages of plant development. The bacterial populations of spinach seed and leaves after germination were compared using DGGE, to assess bacterial community richness, and real-time PCR to compare the abundance of select phyla (total bacteria, <i>Actinobacteria, Bacteroidetes, Firmicutes, Î±-Proteobacteria and Î²- Proteobacteria</i>). To determine the effect of environment, the plants were grown in the field and growth chambers. Vertical transmission of bacterial community members was evide

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28

Thapa, Namrata. "Studies on Microbial Diversity Associated with some fish products of the Eastern Himalayas." Thesis, University of North Bengal, 2002. http://hdl.handle.net/123456789/1340.

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29

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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30

Garrido, Molina Laura. "Molecular characterization of microbial diversity in wastewater treatment and reuse." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/96237.

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La generació d’aigua residual és una conseqüència inevitable de les activitats humanes. Aquestes activitats modifiquen les característiques de les aigües de consum, contaminant-les i invalidant la seva posterior aplicació per altres usos. Abocar aquestes aigües sense depurar ocasiona danys, a vegades irreversibles, al medi ambient. D’altra banda, l’abocament d’aigües no depurades suposa riscos per la salut pública. Per aquesta raó, la depuració de les aigües residuals esdevé una necessitat important a la nostra societat. Les estacions depuradores d’aigües residuals (EDARs) constitueixen un del

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31

Mackenzie, Calderón Roy. "Ecology of hot spring microbial mats: Diversity, microheterogeneity, and biogeography." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/286283.

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Esta Tesis doctoral comprenden una revisión de las poblaciones termófilas que habitan en algunos Hot Spots de diversidad de América, como lo son el bosque lluvioso Valdiviano en la Patagonia, o los Bosques Nubosos de Costa Rica. También se incluyen ecosistemas extremos como el desierto de Atacama y la Isla Decepción en la Antártica. En este trabajo de tesis se caracterizó la estructura de las comunidades bacterianas en tapetes microbianos de varias termas terrestres diferentes mediante métodos de ecología molecular microbiana, y se midió la relación de los cambios de diversidad con respecto a

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32

Kaambo, Eveline. "Investigation of South African estuarine microbial species and genome diversity." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8171_1186398717.

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<p>A study of the microbial diversity in sediments of the Great Berg River estuary is carried out using modern molecular phylogenetic methods. The aim of this study was to determine the effect of (pollution by) the effluents of the fish industry on the composition of the microbial community in the sediments. The diversity in microbial groups of sediment samples that received wastewater from the local fishing industry was investigated by a PCR-DGGE (polymerase chain reaction-denaturing gradient gel electrophoresis) approach and compared to an unaffected site.</p>

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33

Martijn, Joran. "Exploration of microbial diversity and evolution through cultivation independent phylogenomics." Doctoral thesis, Uppsala universitet, Molekylär evolution, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-327310.

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Our understanding of microbial evolution is largely dependent on available genomic data of diverse organisms. Yet, genome-sequencing efforts have mostly ignored the diverse uncultivable majority in favor of cultivable and sociologically relevant organisms. In this thesis, I have applied and developed cultivation independent methods to explore microbial diversity and obtain genomic data in an unbiased manner. The obtained genomes were then used to study the evolution of mitochondria, Rickettsiales and Haloarchaea. Metagenomic binning of oceanic samples recovered draft genomes for thirteen novel

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34

Shi, Shengjing. "Influence of root exudates on soil microbial diversity and activity." Lincoln University, 2009. http://hdl.handle.net/10182/1549.

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Interactions between plant roots and soil microorganisms in the rhizosphere are critical for plant growth. However, understanding of precisely how root exudates influence the diversity and activity of rhizosphere microorganisms is limited. The main objective of this study was to investigate the effect of radiata pine (Pinus radiata) root exudates on rhizosphere soil microbial communities, with an emphasis on the role of low molecular weight organic anions. The study involved the development and validation of new methods for investigating rhizosphere processes in a purpose-built facility. This

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35

Bamforth, Selina Mary. "Microbial diversity and biogeochemical activity in a riparian buffer zone." Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437587.

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Klepac-Ceraj, Vanja 1976. "Diversity and phylogenetic structure of two complex marine microbial communities." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28641.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2004.<br>Includes bibliographical references (p. 102-103).<br>(cont.) competitive mechanisms are too weak to purge diversity from within them.<br>Molecular surveys have revealed that microbial communities are extraordinarily diverse. Yet, two important questions remain unanswered: how many bacterial types co-exist, and do such types form phylogenetically discrete units of potential ecological relevance? This thesis explores these questions by investigating bacterial diversity in two complex ma

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37

Feinstein, Larry M. "Microbial Functional Activity and Diversity Patterns at Multiple Spatial Scales." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1341967745.

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38

Porter, Ashleigh Fay. "Next generation sequencing to explore microbial diversity, origins and evolution." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/24919.

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Emerging infectious diseases are major contributors to morbidity and mortality. To prevent such diseases from occurring in the future it is important to understand pathogen evolution and emergence. Unfortunately, we know little about the virosphere outside of clinically significant viruses, leaving the bulk of viral diversity unexplored. A key aim of my thesis was to reveal more of the unknown diversity of viruses, particularly in under-studied animal hosts. To this end I employed bulk RNA sequencing (“meta-transcriptomics”) to identify novel viruses in a range of hosts, including native Austr

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Milanovic, Vesna, and Vesna Milanovic. "Study of microbial diversity and yeast interactions using molecular methods." Doctoral thesis, Università Politecnica delle Marche, 2012. http://hdl.handle.net/11566/242115.

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I microrganismi svolgono un ruolo fondamentale nella regolazione dei vari ecosistemi, rappresentando la maggior parte delle specie sulla Terra. Lo scopo di questa tesi di dottorato è stato quello di migliorare le conoscenze sulla diversità microbica e sulle dinamiche delle comunità microbiche in varie condizioni negli habitat in diversi processi biotecnologici nell ambito ambientale e industriale, nonché sulle interazioni microbiche utilizzando metodologie classiche e molecolari. Nella prima parte è stata valutata l'efficienza dei letti biologici (biobed) in area Mediterranea nella degradazio

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Sousa, Paula Sanchez de [UNESP]. "Isolamento e caracterização de leveduras de Polybia ignobilis (Hymenoptera: Vespidae)." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/94983.

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Made available in DSpace on 2014-06-11T19:27:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-04-29Bitstream added on 2014-06-13T20:35:52Z : No. of bitstreams: 1 sousa_ps_me_rcla.pdf: 1485165 bytes, checksum: e9ca52a65116171ad1d3dcc0860839f6 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Polybia ignobilis é uma vespa social que apresenta uma alimentação variável e inespecífica, consumindo outros insetos, pedaços de animais mortos, néctar, polpa de madeira e água. Dentro do ninho ocorre a trofalaxia, onde o alimento é distribuído entre os indivíduos

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Lopez-Velasco, Gabriela. "Molecular Characterization of Spinach (Spinacia Oleracea) Microbial Community Structure and its Interaction With Escherichia coli O157:H7 in Modified Atmosphere Conditions." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/37601.

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Leafy greens like lettuce and spinach are a common vehicle for foodborne illness in United States. It is unknown if native plant epiphytic bacteria may play a role in the establishment of enteric pathogens on leaf surfaces. The objective of this study was to characterize the bacterial communities of fresh and packaged spinach leaves and to explore interactions with E. coli O157:H7. We assessed the bacterial diversity present on the spinach leaf surfaces and how parameters such as spinach cultivar, field conditions, post-harvest operations and the presence of E. coli O157:H7 affected its divers

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Suen, Garret. "Understanding prokaryotic diversity in the post-genomics era." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available, full text:, 2008. http://wwwlib.umi.com/cr/syr/main.

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Smith, Jacques J. "Microbial diversity and gene mining in Antarctic Dry Valley mineral soils." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5762_1183463992.

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<p>Soil communities are regarded as among the most complex and diverse assemblages of microorganisms with estimated bacterial numbers in the order of 10â?¹ cells.gâ?»&sup1<br>. Studies on extreme soils however, have reported lower cell densities, supporting the perception that the so-called extreme environments exhibit low species diversity. To assess the extent of microbial diversity within an extreme environment, the mineral soils of the Dry Valleys, Ross Dependency, Eastern Antarctica were investigated using 16S rDNA analysis.</p>

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Karlinska-Batres, Klementyna [Verfasser], and Gert [Akademischer Betreuer] Wörheide. "Microbial diversity of coralline sponges / Klementyna Karlinska-Batres. Betreuer: Gert Wörheide." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1067401628/34.

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Vidal, Dura Andrea. "Controls on microbial diversity and sediment biogeochemistry along a dynamic estuary." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18218/.

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Estuaries are the transition between freshwater and marine environments, and regulate the delivery of riverine fluxes to the oceans. The Humber estuary (UK) is considered a major source of nutrients to the North Sea. It is a highly turbid and dynamic macrotidal estuary that receives contaminated fluxes from agriculture, urbanisation, industry and historical mining activities. The chemistry of the river water and the sediments is modified within the estuarine continuum due to mixing. Sediments are subjected to resuspension periodically (on a tidal cycle timescale) and occasionally or seasonally

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Pino, Vanessa. "Soil Microbial Diversity Across Different Agroecological Zones in New South Wales." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/16705.

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A synergistic relationship between soil diversity (pedodiversity) and soil microbial diversity (biodiversity) seems axiomatic. Soil microbes contribute with biogeochemical cycles on which rely soil services (e.g. food production) and; vice-versa the soil matrix provides the living conditions that structure its microbial communities. A better insight would enable us to quantify/qualify and so sustain, protect, and improve those processes underpinned by soil microorganisms. We hypothesize that the structural patterns of soil microbes rely on multivariate soil units and gradients (e.g. soil horiz

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Fergusson, Stacey Victoria. "Microbial diversity in the human mouth : dominant genera and their interactions." Thesis, University of York, 2010. http://etheses.whiterose.ac.uk/1472/.

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Investigations seeking definition of the microbial diversity present in the human oral cavity have been underway for many years. These investigations seek to define the normal microflora of the oral cavity, as well as the stability of the microflora. Predominantly, these kinds of studies have focused on the differences in microbial carriage between healthy and diseased oral cavities and have identified several species which may be causative and promote oral diseases such as periodontitis and halitosis. Less is known about how co-habitants of a healthy oral cavity interact and how those interac

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Markland, Kendra Marie. "Relating functional microbial diversity to eastern Iowa alluvial aquifer groundwater chemistry." Thesis, University of Iowa, 2018. https://ir.uiowa.edu/etd/6197.

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Alluvial aquifers are important sources of drinking water for Eastern Iowans. However, alluvial aquifers are particularly susceptible to contamination from surface activities due to their shallow depth, permeable material, and close connection to surface waters. Domestic wells and monitoring wells located in alluvial aquifers within the Eastern Iowa Basins study unit, which covers 19,500 square miles, were sampled. The study unit includes the Wapsipinicon, Cedar, Iowa, and Skunk River basins, all of which drain to the Mississippi River. During the summer of 2017, a sampling effort of twelve do

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Bottos, Eric. "Biodiversity and activity of microbial mat communities from Canadian high Arctic ice shelf ecosystems." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100776.

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Microbial mats exist in freshwater pools atop the Ward Hunt and Markham ice shelves in the Canadian high Arctic. In this study, culture-dependent and culture-independent techniques were used to describe the microbial diversity and activity of these mat communities.Bacterial and archaeal 16S rRNA gene clone libraries were constructed from Markham and Ward Hunt mat samples. Bacterial libraries from both mats had high diversity, though the Markham library appeared more diverse than the Ward Hunt library. Over 95% of sequences in both bacterial libraries, and all isolates from both mats, grouped w

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Singh, Prashant. "Microbial assemblage in grapevine's phyllosphere : who is the driver ?" Thesis, Montpellier, SupAgro, 2018. http://www.theses.fr/2018NSAM0042/document.

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Vitis vinifera subsp. vinifera L., les principales espèces de raisins sont cultivées pour la production de fruits et la production de vin dans le monde est un hôte naturel d'une grande variété de micro-organismes procaryotes et eucaryotes qui interagissent avec la vigne, ayant des effets bénéfiques ou phytopathogènes. Ils pourraient également jouer un rôle majeur dans le rendement des fruits, la qualité du raisin, la protection des plantes et, finalement, dans le modèle de la fermentation du raisin et la production de vin. La phyllosphère (constituée des parties aériennes de la plante) est l'u

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