Dissertations / Theses on the topic 'Bacterial diversity'
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Lozupone, Catherine Anne. "Global patterns of bacterial diversity." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3273707.
Full textPowell, James Patrick. "Antibiotic Diversity and Bacterial Resistance." Available to users online at:, 2007. http://hdl.handle.net/10156/1303.
Full textGiaramida, Luca. "Freshwater bacterial diversity, functions and stability." Thesis, Robert Gordon University, 2013. http://hdl.handle.net/10059/843.
Full textCotton, Andrew W. "Biochemical diversity of some bacterial haloalcohol dehalogenases." Thesis, University of Kent, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365223.
Full textHunt, Dana E. Ph D. Massachusetts Institute of Technology. "Aquatic microenvironments in bacterial ecology and diversity." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43047.
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Includes bibliographical references.
Molecular surveys have revealed tremendous bacterial diversity in the world's oceans; yet how do these diverse bacteria with the same essential nutrient requirements co-exist in the same environment? This study examines the role of aquatic microenvironments in generating bacterial diversity: closely related organisms may co-exist in the same environment without competing for resources by a combination of habitat, metabolic, and behavioral differentiation. This hypothesis has been approached from several angles: (i) Within the bacterial family Vibrionaceae is there evidence for microenvironmental specialization or functional differentiation? (ii) Is there small scale clustering of bacteria around phytoplankton in the coastal ocean? Microdiverse clusters (< 1% 16S rRNA gene divergence) of Vibrionaceae were found to be differentially distributed between zooplankton-enriched, particulate, and planktonic water column microenvironments. However microhabitat preferences may not correspond to metabolic capabilities; chitin metabolism was observed to be a near ubiquitous metabolic characteristic of the Vibrionaceae, yet does not appear to be linked to colonization of chitinous zooplankton or particles. Finally, the microscale patchiness of bacterial cells was examined over an annual cycle, revealing seasonal variation and a positive correlation with eukaryotic cell number, suggesting that bacteria may cluster in the nutrient-rich microzones around algae in the environment. This study seeks to answer several fundamental questions about marine bacterial populations: how do closely related species co-exist in the same environment, do bacteria adapt to distinct microscale environments and how important are these microenvironments to bacterial productivity.
by Dana E. Hunt..
Ph.D.
Stuck, Robert Jason. "THE INFLUENCE OF PHYTOREMEDIATION ON BACTERIAL DIVERSITY." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1133398530.
Full textDixit, Sameer M. "Antagonistic activity of probiotic bacteria based on bacterial diversity in the porcine gut." Thesis, View thesis, 2004. http://handle.uws.edu.au:8081/1959.7/35614.
Full textDixit, Sameer M. "Antagonistic activity of probiotic bacteria based on bacterial diversity in the porcine gut." View thesis, 2004. http://handle.uws.edu.au:8081/1959.7/35614.
Full textA thesis presented to the University of Western Sydney, Hawkesbury, Centre for Advanced Food Research, in fulfilment of the requirements for the degree of Doctor of Philosophy. Includes bibliographies.
Bayindirli, Cansu. "Environmental influences on marine bacterial diversity and activity." Thesis, University of East Anglia, 2016. https://ueaeprints.uea.ac.uk/59617/.
Full textLu, Ting. "Bacterial diversity as a biomarker of soil health." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1283192368.
Full textKinneer, Krista L. "Size fractionation of bacterial functional diversity within soils." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1095.
Full textTitle from document title page. Document formatted into pages; contains x, 68 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 47-48).
Gilbert, Janice M. "Examining the link between macrophyte diversity, bacterial diversity, and denitrification function in wetlands." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1086098505.
Full textDocument formatted into pages; contains xiii, 234 p. Includes bibliographical references. Abstract available online via OhioLINK's ETD Center; full text release delayed at author's request until 2005 June 1.
Zhang, Quan-Guo. "Diversity and competitive interactions in experimentally evolved bacterial populations." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:922d763d-3d66-40c8-96d3-5b8e95e24fe4.
Full textAshforth, Elizabeth Jane. "Bacterial diversity in an arenicola marina L. bioturbated mesocosm." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500948.
Full textHodder, Karl Russell. "The diversity of soil bacterial communities within the Ecotron." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343965.
Full textLawler, Stephanie Nichole. "Characterization of Bacterial Diversity in Cold-Water Anthothelidae Corals." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6295.
Full textTydings, Heather Anne. "Identification and Optimization of the Antagonistic Potential of Native Spinach Microbiota towards Escherichia coli O157:H7." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/43364.
Full textMaster of Science
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.
Full textRoth, McKenzie L. "Analysis of Bacterial Abundance and Species Diversity in Various Soils." Ashland University Honors Theses / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=auhonors1355166102.
Full textZul, Delita. "Determinants of the Bacterial Diversity in Manipulated and Natural Soils." Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-82880.
Full textSuvekbala, Vemparthan [Verfasser]. "Physiology and biochemical diversity of bacterial cholate degradation / Vemparthan Suvekbala." Konstanz : Bibliothek der Universität Konstanz, 2011. http://d-nb.info/1023649934/34.
Full textMansfield, Fiona Kerrie. "Allometric scaling in bacterial populations : cell size, distribution and diversity." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424704.
Full textBell, Thomas. "Diversity and functioning of the bacterial communities inhabiting treehole ecosystems." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427899.
Full textLowe, Peter Richard. "Molecular detection and analysis of the diversity of bacterial dehalogenases." Thesis, University of Aberdeen, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368833.
Full textCosta, Sara Daniela Azevedo. "Diversity of the cutaneous bacterial community in the Perez’ frog." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12634.
Full textAmphibian skin holds a resident bacterial community in the skin surface may confer amphibian species tolerance to environmental stressors. Exposure to chemical contamination may cause direct effects to the amphibians but, simultaneously, may reduce skin bacterial diversity and consequently alter the sensitivity of amphibians to future environmental stressors. Understanding the structure, dynamics and specificity of this microbial community is needed to engage a better and broader protection of amphibians. Accordingly, the present study aimed at investigating the skin-associated bacterial community of the Perez´s frog Pelophylax perezi (Seoane) looking at among and within population variation. To attain this main goal the outer microbiome of the frogs were characterize by culture independent method (PCR/DGGE) and assessing the cultivable portion of bacteria. Furthermore, to evaluate the effects caused by exposure to chemical contamination in the skin bacterial community, some bacterial isolates were exposed to a rich metal contaminated effluent. Skin swabs for sampling symbiotic skin bacteria were collected from 28 amphibian individuals from five different ponds, one of them a metal-rich contaminated effluent (Ribeira da Agua Forte, Aljustrel). For each sampling site physical and chemical characterization of water samples was carried out. A culture independent method showed a characteristic profile in frogs from contaminated site and that both intra- and inter-population variability exist in amphibian skin microbiome. Assessing the cultivable portion of bacteria, microbial concentration per amphibian varied within animals from the same environment and between animals from different environments. Results revealed low diversity and bacterial density (CFU/ frog swab sample) on individuals from metal contaminated site. Isolated bacteria were genetically identified based on 16S rRNA gene sequence. Ecotoxicological assays exposing 30 bacterial isolates to the metal contaminated effluent showed that the percentage of resistant isolates was higher in frogs from the contaminated site. It was also observed that those bacteria exposed to effluent presented a delay in their growth rate.
A pele de alguns anfíbios possui uma comunidade bacteriana residente que pode conferir tolerância a stress ambiental. A contaminação química pode causar efeitos adversos diretos em anfíbios, mas ao mesmo tempo pode reduzir a diversidade bacteriana da pele e, consequentemente, alterar a sensibilidade destes organismos a futuras perturbações ambientais. Compreender a estrutura, dinâmica e especificidade desta comunidade microbiana é necessário para desenvolver uma melhor e mais ampla proteção deste grupo de organismos. Assim, o presente estudo teve como objetivo geral investigar a comunidade bacteriana associada à pele da rã verde comum Pelophylax perezi (Seoane) através da análise da variação intra- e inter populacional. Para alcançar este objetivo o microbioma exterior das rãs foi caracterizado pelo método independente de cultura (PCR / DGGE) e avaliada também a parte cultivável de bactérias. Além disso, para avaliar os efeitos causados pela exposição a contaminação química na comunidade bacteriana da pele, 30 isolados bacterianos foram expostos a um efluente ácido e rico em metais. As zaragatoas para amostrar as bactérias simbióticas da pele dos anfíbios foram recolhidas em 28 indivíduos de cinco locais diferentes, um deles impactado por um efluente ácido e rico em metais (Ribeira da Água Forte, Aljustrel). Para cada local de amostragem foi realizada a caracterização físico-química de amostras de água. O método independente de cultura mostrou um perfil característico de rãs do local contaminado e que a variabilidade tanto intra- e inter- populacional existe no microbioma da pele da rã P. perezi, no entanto, a última parece ser maior do que o anterior. Avaliando a porção cultivável de bactérias, a concentração microbiana por anfíbio varia entre animais do mesmo meio e entre os animais de diferentes ambientes. Os resultados revelaram uma baixa diversidade e densidade de bactérias (UFC / zaragatoa) em indivíduos que habitam o local contaminado por metais. As bactérias isoladas foram geneticamente identificadas com base na sequência do gene de rRNA 16S. O ensaio ecotoxicológico de exposição de isolados bacterianos ao efluente ácido e rico em metais mostrou que a percentagem de isolados resistentes foi maior em isolados provenientes de animais da área impactada pelo efluente. Foi ainda observado que isolados bacterianos quando expostos ao efluente têm um atraso na sua taxa de crescimento comparativamente ao controlo.
Kang, Seong-San. "Bacterial Diversity as a Predictor of Beef Quality and Safety." Thesis, Curtin University, 2021. http://hdl.handle.net/20.500.11937/82885.
Full textPeter, Hannes. "Diversity and Ecosystem Functioning : Redundancy and Resilience in Freshwater Bacterial Communities." Doctoral thesis, Uppsala universitet, Limnologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160780.
Full textZhang, Li, and n/a. "Bacterial Diversity of Australian Exotic Pine Forest Soil and Leaf Litter." Griffith University. School of Biomolecular and Biomedical Science, 2007. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20071128.094745.
Full textNigro, Lisa M. "Distribution and Diversity of Bacterial Chemolithotrophs in Marine and Freshwater Sediments." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/NigroLM2006.pdf.
Full textHoffman, Michele Therese. "Bacterial Endosymbionts of Endophytic Fungi: Diversity, Phylogenetic Structure, and Biotic Interactions." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/196079.
Full textZhang, Li. "Bacterial Diversity of Australian Exotic Pine Forest Soil and Leaf Litter." Thesis, Griffith University, 2007. http://hdl.handle.net/10072/366994.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Biomedical Sciences
Faculty of Science and Technology
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Petersson-Wolfe, Christina Sonja. "A study of the occurrence, phenotypic and genotypic diversity and both in vitro and in vivo growth responses of Enterococcus spp. isolated from bovine origin." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1153766262.
Full textBarcenilla, Adela. "Diversity of the butyrate-producing microflora of the human gut." Thesis, Robert Gordon University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310425.
Full textThomson, Bruce Craig. "Plant Input Effects on the Diversity and Function of Grassland Bacterial Communities." Thesis, University of Newcastle upon Tyne, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485856.
Full textBellingham, Nessa Francis. "The use of the bacterial flagellin gene to study diversity amongst pseudomonads." Thesis, Coventry University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297502.
Full textSengupta, Adti. "Studying Methanotrophic Bacterial Diversity in Ohio Soils Using High-Throughput Sequence Analysis." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1436956336.
Full textLarouche, Julia. "Environmental Influences on the Genetic Diversity of Bacterial Communities in Arctic Streams." ScholarWorks @ UVM, 2009. http://scholarworks.uvm.edu/graddis/131.
Full textLad, Ganesh Raoji. "Phenomic and genomic diversity of a bacterial species in a local population." Thesis, University of York, 2013. http://etheses.whiterose.ac.uk/5643/.
Full textStilwell, Peter Robert. "The ecology and evolution of diversity and cooperation in bacterial public-goods." Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/33191.
Full textAl-Murayati, Haider. "Diversity of the bacterial community and secondary sexual characters in the peacock." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS096/document.
Full textBird feathers harbour numerous microorganisms that could be acquired from the surrounding environment, these microorganisms may exert intense selection on their hosts by reducing fecundity and survivorship. Several bacterial taxa that live on feathers have the ability to degrade feather keratin and cause damage to feather structure and may alter the feather colouration. Birds use visual signals such as bright colours or exaggerated ornamentation for socio-sexual communication as well as species recognition. Only healthy individuals are able to produce exaggerated secondary sexual characters and still remain resistant to debilitating parasites. Peacocks (Pavo cristatus) is a polygamous species that have different exaggerated ornamentation, the most notable secondary sexual characters of the peacock are their long-decorated trains that comprise the magnificent ocelli which contain three different iridescent colours. Through a culture based technique we isolate feather bacterial community from differently coloured parts of the ocelli of the peacock’s train. The study reveals that there was a heterogeneous distribution of bacteria among the differently coloured parts of ocelli. The abundance and prevalence of specific bacterial taxa was related to the degree of feather degradation, expression of different secondary sexual character, changes in ocelli colouration and daily growth increment. Furthermore, we found a small effect of the expression of secondary sexual characters on biasing of brood sex ratio towards production of more sons than daughters. The work presented in this thesis provide evidence that feather ocelli may consider as a reliable signal of the diversity and the abundance of bacteria in peacock and in consequence indication for the individual quality and that allowing the choosy females to pick males with a specific bacterial community
Berga, Quintana Mercè. "Assembly Mechanisms in Aquatic Bacterial Communities : The Role of Disturbances, Dispersal and History." Doctoral thesis, Uppsala universitet, Limnologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-207183.
Full textKanso, Sungwan, and n/a. "Molecular Studies of Bacterial Communities in the Great Artesian Basin Aquifers." Griffith University. School of Biomolecular and Biomedical Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040219.140509.
Full textKanso, Sungwan. "Molecular Studies of Bacterial Communities in the Great Artesian Basin Aquifers." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366613.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Biomedical Sciences
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Shams, Malek. "Assessing the diversity of agrobacterial populations." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00984505.
Full textO'Neill, Andrew. "The microbial diversity of wetland sediments constructed to treat acid mine drainage as determined by molecular techniques /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16527.pdf.
Full textAn, Shu. "Characterization of bacterial diversity in three oligotrophic environments using high-throughput sequencing technology." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00859417.
Full textHussain, Malik Asif. "An investigation of the impact of bacterial diversity, pathogenic determinants and biofilms on chronic wounds." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/110339/2/Malik_Asif_Hussain_Thesis.pdf.
Full textHorn, Matthias. "Molecular ecology of free-living amoebae and their bacterial endosymbionts diversity and interactions /." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963285157.
Full textGrove, Jason Andrew. "Assessment of the Potential Functional Diversity of the Bacterial Community in a Biofilter." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/850.
Full textA number of experiments were performed in laboratory-scale biofilters using ethanol as a model contaminant. All biofilters were able to remove the ethanol with elimination capacities in the range 80 to 200gVOCm-3h-1; these values are comparable with published literature. Natural organic media (peat or compost) was used as packing.
The potential functional diversity of the community was assessed by Community-Level Physiological Profiling (CLPP) using sole-Carbon Source Utilisation Profile (CSUP). Community samples were used to inoculate Biolog EcoPlatesTM: microplates containing a selection of 31 different carbon-substrates and an indicator dye responding to bacterial growth. This technique was found to be sensitive to changes in the community structure over time and location.
Results showed that the community in samples taken close together (over a scale of a few centimetres) are similar and that relatively small media samples (0. 5 to 1 g) provide reproducible information. A study of a single biofilter indicated stratification of the community occurring with the community near the inlet diverging from that near the middle and outlet of the unit; this is attributed to the ethanol being degraded in the upper part of the column and the lower part of the column not being subjected to ethanol loading. In a study of two units at a higher loading rate, stratification was not observed over a period of weeks; it is suggested that the stratification may develop over this timescale as a result of the presence or absence of the Volatile Organic Compound (VOC) and not due to differences in concentration.
An acclimation period of 7 to 10 days was observed before near-complete removal of ethanol was attained. Monitoring of the community suggested a subsequent shift in diversity. It is suggested that the initial acclimation period is due to biofilm formation and the subsequent shift in community diversity is due to re-organisation of the community as species specialise. In a portion of the biofilter with minimal ethanol exposure, a sudden shift in community is observed after a period of some weeks. This may reflect changes as a result of starvation and indicates that periods of shut-down (when the biofilter is not loaded) may affect the community.
Two studies of biofilters operating in parallel were carried out. The first provided evidence of a divergence in the communities over a period of two weeks. In the second, communities in the two units underwent changes over time but observations from both units at any one time were similar. This demonstrates that biofilters set-up and operated in a similar manner may maintain similar communities but that this is not necessarily the case. This has implications for the reproducibility of laboratory experiments and for the variation of community structure with horizontal position in industrial units.
Mahmoud, Huda Mahmoud Abdullah. "Structural and functional diversity of epilithic bacterial communities in streams : effects of pollution." Thesis, University of Hull, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271992.
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