Tesis sobre el tema "Bacterial communities"
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Jayaswal, Gaurav. "Spatial confinement of bacterial communities". Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3423866.
Texto completoIl moto di batteri ha attratto gli scienziati da decenni e, ultimamente, c’è stato un crescente interesse nello studio del moto collettivo di batteri in geometrie confinate. Questa tesi descrive uno studio sperimentale della distribuzione di densità di soluzioni di batteri di concentrazione diversa confinate tra due pareti parallele. Si sono usati due tipi di batteri, Pseudomonas ed E. coli, che presentano diversi meccanismi di propulsione. Il comportamento di E. coli è stato studiato in dettaglio, invece non ci sono lavori in letteratura riguardanti Pseudomonas, per quello che sappiamo. L’apparato sperimentale consisteva di due vetrini separati da spaziatori che definivano la regione confinante. La distanza di separazione variava da 100 a 250 micron. I due vetrini erano funzionalizzati con albumina di serio bovino per evitare l’adesione dei batteri al vetro. Alla sospensione era stato aggiunto del percoll per aggiustare la spinta idrostatica agente sui batteri. In accordo con precedenti studi, abbiamo trovato un significativo aumento di densità in prossimità delle pareti per entrambi i tipi di batteri. Questo effetto non sembra essere influenzato né dalla distanza di separazione, né dalla concentrazione della soluzione. Questi risultati sono stati confrontati con quelli ottenuti da simulazioni numeriche di particelle auto-propellenti c he interagiscono solo mediante interazioni steriche. I dati preliminari supportano l’osservazione sperimentale suggerendo che le sole interazioni steriche sono sufficienti a produrre addensamento dei batteri alle pareti.
Benskin, Clare McWilliam Haldane. "Bacterial communities in the avian gut". Thesis, Lancaster University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539637.
Texto completoFidalgo, Cátia Isabel Assis. "Endophytic bacterial communities of Halimione portulacoides". Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22661.
Texto completoOs sapais são ecossistemas marinhos altamente produtivos que frequentemente recebem contaminantes de natureza antropogénica. A Ria de Aveiro encontra-se no noroeste de Portugal e contém numerosos sapais. Halimione portulacoides é um dos halófitos mais importantes em sapais Europeus e tem sido amplamente estudada devido ao seu potencial para ser usada em fins de fitorremediação, e como bioindicador de contaminação de sedimentos. Bactérias endofíticas podem apresentar capacidade promotora do crescimento de plantas (PCP), quer diretamente por produção de fito-hormonas e aquisição de nutrientes, quer indiretamente via competição com fitopatogenos. No presente trabalho, a diversidade de bactérias endofíticas da planta de sapal H. portulacoides da Ria de Aveiro é explorada extensivamente. Isolados de bactérias endofíticas foram obtidos e caracterizados quanto à sua taxonomia, capacidade de produzir enzimas e características PCP. As características mais observadas foram atividade celulolítica, xilanolítica e desaminase de 1-aminociclopropano-1-carboxilato, e a produção da auxina ácido indol-3-acético. Os resultados revelaram um enorme potencial da coleção para PCP in vitro e in vivo. A coleção de isolados foi também explorada para procurar diversidade não descrita. Como resultado, dez novas espécies de bactérias foram amplamente caracterizadas e descritas: Microbacterium diaminobutyricum, Saccharospirillum correiae, Altererythrobacter halimionae, Altererythrobacter endophyticus, Zunongwangia endophytica, Salinicola halimionae, Salinicola aestuarina, Salinicola endophytica, Salinicola halophytica e Salinicola lusitana. Consequentemente, o presente trabalho expôs a endosfera de H. portulacoides como um foco de diversidade bacteriana desconhecida. A composição taxonómica da comunidade endofítica foi averiguada via sequenciação do gene 16S rRNA da coleção de isolados, e mais profundamente com a utilização de sequenciação de alto rendimento independente do cultivo. A última abordagem revelou cinco filos principais: Proteobacteria, Planctomycetes, Actinobacteria, Bacteroidetes e Firmicutes. Destes, apenas Planctomycetes não foi obtido na coleção de isolados. As comunidades diferiram de acordo com o local (no ensaio dependente do cultivo, para locais contaminados e não-contaminado) e tecido (em ambos os ensaios) de amostragem. As principais famílias obtidas no endofitoma nuclear foram Oceanospirillaceae em tecidos de parte aérea, e Enterobacteriaceae e Kiloniellaceae em tecidos de raiz. O trabalho apresentado providenciou uma compreensão profunda das bactérias endofíticas presentes no halófito H. portulacoides, e expôs o seu potencial como foco de bactérias não descritas e bactérias promotoras do crescimento de plantas.
Salt marshes are highly productive marine ecosystems that often act as a sink for contaminants of anthropogenic nature. The Ria de Aveiro lagoon is located in the north-west of Portugal and comprises numerous salt marshes. Halimione portulacoides is one of the most important halophytes in European salt marshes and has been widely researched for its potential for phytoremediation, and as a bioindicator of sediment contamination. Endophytic bacteria can present plant growth promotion (PGP) abilities, either directly by production of phytohormones and nutrient uptake, or indirectly via competition with phytopathogens. In the present work, the diversity of endophytic bacteria from the salt marsh plant H. portulacoides from Ria de Aveiro is extensively explored. Endophytic bacterial isolates were obtained and characterized for their taxonomy, ability to produce specific enzymes and PGP traits. The most observed traits were cellulolytic, xylanolytic and 1-aminocyclopropane-1-carboxylate deaminase activities, and the production of the auxin indol-3-acetic acid. The results revealed an enormous potential of the collection for in vitro and in vivo PGP. The collection of isolates was also explored for undescribed diversity. As a result, ten novel bacterial species were thoroughly characterized and described: Microbacterium diaminobutyricum, Saccharospirillum correiae, Altererythrobacter halimionae, Altererythrobacter endophyticus, Zunongwangia endophytica, Salinicola halimionae, Salinicola aestuarina, Salinicola endophytica, Salinicola halophytica and Salinicola lusitana. Consequently, the present work exposes the endosphere of H. portulacoides as a hotspot of unknown bacterial diversity. The taxonomic composition of the endophytic community was assessed via 16S rRNA gene sequencing of the isolate collection, and with more depth using culture-independent high-throughput sequencing. The latter approach revealed five main phyla: Proteobacteria, Planctomycetes, Actinobacteria, Bacteroidetes and Firmicutes. From these, only Planctomycetes was not obtained in the isolate collection. The communities differed according to sampling site (for the culture-dependent assay, for contaminated and non-contaminated sites) and tissue (in both assays). The main families found in the core endophytome were Oceanospirillaceae for aboveground tissues, and Enterobacteriaceae and Kiloniellaceae for belowground tissues. The present work provided a deep understanding of the endophytic bacteria present in the halophyte H. portulacoides, and exposed its potential as a hotspot of undescribed bacteria and plant growth promoting bacteria.
Riddell, Andrew. "Characterisation of bacterial communities within chronic wounds". Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/41930/.
Texto completoCo, Julia Yin-Ting. "The influence of mucins on bacterial communities". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99569.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references.
Mucus is the hydrogel layer that coats all wet epithelia in the body. By supporting commensal microbes and preventing pathogenic invasion, mucus maintains host-microbe homeostasis. Mucin polymers, the primary gel-forming component of mucus, are an important mediator of mucus-microbe interactions. In this thesis, I demonstrate that mucins impact bacterial communities in their physical structure as well as microbe-microbe and microbe-host dynamics. In Chapter 2, 1 study the ability of mucin surface coatings to suppress bacterial surface attachment, the first step in biofilm formation, for Streptococcus pneumoniae and Staphylococcus aureus. Mucin-bound glycans were identified as a critical structural component of mucin coatings that are necessary for bacterial repulsion. In Chapter 3, 1 investigate how mucins impact established Pseudomonas aeruginosa biofilms. The data reveal that mucins cause disassembly and structural rearrangement in P. aeruginosa biofilms in a mucin concentration and flow rate dependent manner. In Appendix A, I show evidence for the involvement of the bacterial flagella in mucinmediated biofilm disruption. Deletion of flagellar capfliD or flagellar stators motABCD results in biofilms that are resistant to mucin-mediated dissociation. In Appendix B, I examine how mucins affect dual-species bacterial communities. I show that mucins promote S. aureus survival during co-culture with P. aeruginosa and also suppress the anti-staphylococcal effects of P. aeruginosa pyocyanin. In Appendix C, I explore the impacts of mucins on P. aeruginosa quorum sensing, an important pathogenic determinant in P. aeruginosa infections. I found that mucins suppress the expression of P. aeruginosa Las and Rhl quorum sensing genes as well as downstream virulence factors. In Appendix D, I assess how mucins modulate P. aeruginosa-epithelium interactions. The data show that mucins hinder the ability of P. aeruginosa to attach to epithelial cells in vitro. Additionally, mucins suppressed P. aeruginosa-associatede pithelial cytotoxicity in a mucin concentration dependent manner. Together, this thesis demonstrates that mucins modulate microbial communities in their behavior and interactions. Understanding how mucus and mucins impact microbes provides insight to host-microbe relationships, as well as for the development of novel bacteria-regulating strategies.
by Julia Yin-Ting Co.
Ph. D.
Kanso, Sungwan y 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.
Texto completoKanso, Sungwan. "Molecular Studies of Bacterial Communities in the Great Artesian Basin Aquifers". Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366613.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Biomedical Sciences
Full Text
Rodriguez, Caballero Adrian. "STUDY OF BACTERIAL COMMUNITIES : – A WASTEWATER TREATMENT PERSPECTIVE". Licentiate thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-11884.
Texto completoHaglund, Ann-Louise. "Attached Bacterial Communities in Lakes – Habitat-Specific Differences". Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4627.
Texto completoBeeton, S. "Biotransformation of T-2 toxin by bacterial communities". Thesis, University of Kent, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234437.
Texto completoShaw, L. P. "The microbial ecology of human-associated bacterial communities". Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10046977/.
Texto completoAbidov, Amir. "Effects of Hormone Crosstalk on Endophytic Bacterial Communities". Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/578977.
Texto completoHodder, 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.
Texto completoMeadow, James, Adam Altrichter, Steven Kembel, Maxwell Moriyama, Timothy O'Connor, Ann Womack, G. Brown, Jessica Green y Brendan J. Bohannan. "Bacterial communities on classroom surfaces vary with human contact". BioMed Central, 2014. http://hdl.handle.net/10150/610203.
Texto completoNieset, Julie E. "The Effect of Protozoan Predation on Four Bacterial Communities". University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145300999.
Texto completoHaldar, Kairabi Sadhu. "Profiling of bacterial communities in chronic obstructive pulmonary disease". Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/32292.
Texto completoRahalkar, Monali. "Aerobic methanotrophic bacterial communities in sediments of Lake Constance". [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-23787.
Texto completoRedford, Amanda J. "Interspecies and temporal variation in bacterial leaf surface communities". Connect to online resource, 2008. 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:1456691.
Texto completoJohnston, Gloria P. "CHARACTERIZATION OF BACTERIAL COMMUNITIES OF RIVERBANK SEDIMENTS CONTAMINATED WITH POLYCYCLIC AROMATIC HYDROCARBONS". Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1397761347.
Texto completoLangenheder, Silke. "Links Between Structure and Function of Heterotrophic Aquatic Bacterial Communities". Doctoral thesis, Uppsala : Department of Ecology and Evolution : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4809.
Texto completoGill, Hardeep. "The Effect of Aluminium Industry Effluents on Sediment Bacterial Communities". Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23423.
Texto completoBell, 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.
Texto completoChronopoulou, Panagiota-Myrsini. "Impact of crude oil on bacterial communities in marine ecosystems". Thesis, University of Essex, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531559.
Texto completoFevat, Lena. "Biogeography of bacterial, archaeal and picoeukaryotic communities in marine sediments". Thesis, University of Essex, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428962.
Texto completoLASEKE, IAN MATTHEW. "IDENTIFICATION AND CHARACTERIZATION OF BACTERIAL COMMUNITIES IN WARM GROUNDWATER AQUIFERS". University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1172086705.
Texto completoMueller, Sabrina R. "Chromium, DNA, and Soil Microbial Communities". Cincinnati, Ohio : University of Cincinnati, 2006. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1141334651.
Texto completoAdvisor: Brian K. Kinkle. Title from electronic thesis title page (viewed Apr. 23, 2009). Keywords: SEC-ICP-MS; Fungal community; bacterial community; DGGE. Includes abstract. Includes bibliographical references.
Hwang, Chiachi. "Assessment of bacterial communities and an iron-reducing bacterium in relation to an engineered bioremediation system designed for the treatment of uranium-nitric acid contaminated groundwater". Oxford, Ohio : Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1241117969.
Texto completoAnitsakis, Erin Colleen. "Dynamics of marine pelagic bacterial communities on the Texas-Louisiana shelf". [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1172.
Texto completoBraun, Burga. "Microbiological and molecular analysis of bacterial communities of an urban soil". [S.l.] : [s.n.], 2007. http://opus.kobv.de/tuberlin/volltexte/2007/1525.
Texto completoKoch, Isabella. "Assessment of soil bacterial communities with emphasis on the phylum Acidobacteria". Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-85547.
Texto completoPeter, 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.
Texto completoKoch, Isabella Heidi. "Assessment of soil bacterial communities with emphasis on the phylum Acidobacteria". kostenfrei, 2008. http://edoc.ub.uni-muenchen.de/8554/.
Texto completoDoulgeraki, Agapi I. "Monitoring the succession of bacterial communities during storage of raw meat". Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/5575.
Texto completoBlanchard, Laurine. "Impact of lightning on evolution, structure and function of bacterial communities". Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-01024190.
Texto completoJones, Meredith Denise Martin. "Oilfield microbiology and the effects of nitrate injection on bacterial communities". Thesis, University of Exeter, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440338.
Texto completoBlow, F. "Variation in the structure and function of invertebrate-associated bacterial communities". Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3009325/.
Texto completoGRENNI, PAOLA. "Effects of pesticides and pharmaceuticals on soil and water bacterial communities". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/19697.
Texto completoKing, D. H. "Modification of sedimentary communities of nitrate-reducing bacteria by environmental perturbations". Thesis, University of Essex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373211.
Texto completoFoster, Jodene. "Characterization of bacterial species in Steinkopf a communal farming area in South Africa: A closer look at pathogenesis". University of the Western Cape, 2019. http://hdl.handle.net/11394/7013.
Texto completoThe human population in sub-Saharan Africa has been increasing due to decreases in mortality rates and increases in average human age; in turn increasing poverty and pressure placed on agriculture and agricultural production. However, livestock production in South Africa, and globally, is declining due to disease and parasite prevalence, lack of feed, poor breeding, marketing management, change in nutrition in both livestock and humans, rapid urbanization, encroachment on wildlife and unfavourable climatic conditions brought about by global change. One unintended consequence has been the emergence and spread of transboundary animal diseases and, more specifically, the resurgence and emergence of zoonotic disease. Zoonotic diseases are sicknesses transmissible from animals to humans, resulting from direct contact or environmental reservoirs. Previous studies have identified small-scale farmers as the group most prevalent to contracting zoonotic diseases, especially those working in a communal dispensation. Therefore, this study focused on the communal farming area of Steinkopf in the semi-arid Namaqualand region of South Africa. Steinkopf is one of the largest Act 9 areas, with communal land tenure and a mixed farming system, sheep and goats, on about 759 ha. Steinkopf is divided into two rainfall regions, the Succulent Karoo (winter rainfall region) and the Nama Karoo (summer rainfall region). This study aims to identify and characterise the bacterial microbial communities found in the topsoil layer and faecal matter (dung) within the winter and summer rainfall regions of Steinkopf communal rangeland using Next-generation sequencing. Further, the aim is to assess whether pathogenic bacteria are present within the rangeland and what their potential impact on the local farming community might be if present. A high-throughput sequencing technique (Next-generation sequencing) was used to amplify 16S rRNA targeting the V3-V4 hypervariable regions. The phylotypes produced were 37 phyla, 353 families and 634 genera of which the most abundant bacterial phyla were Planctomycetes, Firmicutes and Bacteroidetes and the most abundant genera were Gemmata, Akkermansia and Arthrobacter. Alpha diversity indices showed a variation in species diversity, evenness and richness between soil and dung samples, it shows a higher species richness, evenness and unique OTUs detected in summer soil samples and at natural water holes. Through these analysis soil samples were regarded as superior to dung samples within this particular environment and for this particular study. Natural water holes were identified as a safer option when compared to man-made water holes as there are natural systems in place that combat the spread and growth of harmful bacterial microbes. It was found that seasonality has a great impact on the development and growth of environmental bacterial microbiota and that the current randomness of grazing routes and migrations within the Steinkopf communal rangeland is not a detriment but instead acts as a benefits to environmental and livestock health. Furthermore, a total of three pathogenic bacteria were identified however, they occurred at relatively low abundances. It can thus be concluded that this study thoroughly describes the usefulness of using a high-throughput sequencing technique such as Next-generation sequencing when amplifying a small sample size in order to achieve a large volume of information; and that currently the Steinkopf communal rangeland is not subjected to or at risk of a potential zoonotic threat.
FAGORZI, CAMILLA. "The green deal challenge: exploiting biotic interactions from bacterial strains to communities". Doctoral thesis, Università degli studi di Ferrara, 2021. http://hdl.handle.net/11392/2488178.
Texto completoUno dei principali fattori alla base della sostenibilità ambientale è la gestione efficace degli input di azoto (N), un elemento chiave per la produzione agricola. La crescita delle piante e la resa agricola sono il risultato di complesse interazioni tra la pianta, il suolo e le sue comunità microbiche. Un modo efficace per la gestione degli input di azoto, che ha come risultato lo sviluppo di pratiche agricole economicamente valide e rispettose dell'ambiente, è l'uso di azoto fissato biologicamente. I batteri simbionti azoto fissatori (rizobi) rappresentano una preziosa fonte di azoto fissato biologicamente, poiché forniscono alla pianta (legume) questo importante elemento direttamente a livello della radice. Il primo capitolo di questa tesi si concentra sull'argomento appena menzionato, la simbiosi tra piante leguminose e rizobi, spaziando dalle più recenti scoperte sui rizobi, volte a migliorare le pratiche agricole in terreni di difficile coltivazione, alla scelta del miglior partenariato. Sebbene siano specie-specifici, i rizobi in natura mostrano una variabilità piuttosto ampia nell'efficienza simbiotica con diverse varietà della stessa specie di pianta ospite, il che può limitare la loro applicazione come inoculanti per le colture. Mentre le basi molecolari della specie-specificità sono state ben definite, quelle che determinano la specificità tra la varietà vegetale e ceppi batterici appartenenti alla stessa specie sono sconosciute. In questo primo capitolo, vengono sezionate le evoluzioni della partnership simbiotica fra pianta e rizobio. Le specie modello Sinorhizobium meliloti (syn. Ensifer) e Medicago sativa (erba medica) sono diventate il nostro modello per studiare il riconoscimento ospite-simbionte durante la percezione reciproca iniziale. Accanto alle nuove scoperte sull'evoluzione della fissazione dell'azoto simbiotico, la revisione tassonomica del genere Sinorhizobium/Ensifer indica alcune linee guida per la delineazione del genere nelle Rhizobiaceae. Il secondo capitolo si concentra sullo studio del microbiota e della sua interazione con l'ambiente, analizzando le “firme” della vita microbica in natura. La microbiologia ambientale può essere definita come lo studio dei microrganismi, delle loro funzioni e interazioni in tutti gli habitat della Terra (e oltre). Gli articoli presentati in questo capitolo hanno lo scopo di esplorare tre diversi ambienti che condividono la caratteristica di essere “estremi”, non convenzionali, per i microbi aerobici, mesofili. Il terzo capitolo riporta un'indagine di biologia dei sistemi delle strategie di adattamento metabolico con uno studio sulla diauxia, che mostra le reti metaboliche di Pseudoalteromonas haloplanktis (un batterio marino eterotrofico) in complesse condizioni nutrizionali incontrate nell'ambiente.
Nyberg, Karin. "Impact of organic waste residues on structure and function of soil bacterial communities : with emphasis on ammonia oxidizing bacteria /". Uppsala : Dept. of Microbiology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200620.pdf.
Texto completoThomson, 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.
Texto completoJesus, Indhira I. de (Indhira Immaculada de). "The effects of toluene contamination on epilithic bacterial communities in a stream". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35985.
Texto completoArmstrong, Alacia. "Seasonal dynamics of edaphic bacterial communities in the hyper-arid Namib desert". Thesis, University of the Western Cape, 2014. http://hdl.handle.net/11394/3855.
Texto completoThe aim of this study is to investigate the edaphic bacterial community dynamics over short (57 days) and long-term (1 year) sampling intervals using an extensive sampling strategy in combination with community fingerprinting by T-RFLP analyses and micro environmental characterization. The short-term study was conducted on three distinct locations in the Namib Desert gravel plains. Soil bacterial communities were found to be more similar within habitats than between habitats, with the differences likely shaped by soil pH. These findings are consistent with the concept of habitat filtering. Investigation of edaphic bacterial communities over 1 year in an 8100 m2 sampling site revealed seasonal patterns of variation in community structure. Soil moisture, phosphorus, potassium and magnesium were identified as significant abiotic drivers of community temporal dynamics. β diversity was found to increase over time, while the environment remained relatively static. These findings support previous observations that desert communities are likely structured by stochastic and deterministic processes. Taken together, these findings advance understanding of temporal variation of edaphic communities in the Namib desert
Larouche, Julia. "Environmental Influences on the Genetic Diversity of Bacterial Communities in Arctic Streams". ScholarWorks @ UVM, 2009. http://scholarworks.uvm.edu/graddis/131.
Texto completoDyda, Rachael Y. "Linking phylogeny and lipid composition of natural bacterial communities in arctic waters". College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/3252.
Texto completoThesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Santmire, Judith Ann. "Bacterial communities in a Northeast Ohio stream effects of substrate size, environmental features and temporal changes /". [Kent, Ohio] : Kent State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1113326109.
Texto completoTitle from PDF t.p. (viewed Aug. 23, 2006). Advisor: Laura G. Leff. Keywords: bacterial communities; substrate; lotic; fluorescent in situ hybridization; sediment. Includes bibliographical references.
Andersson, Martin. "Extent and limitations of functional redundancy among bacterial communities towards dissolved organic matter". Doctoral thesis, Uppsala universitet, Limnologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331772.
Texto completoMohseni, Mojtaba. "Molecular Characterisation and Horizontal Gene Transfer within 2,4-Dichlorophenoxyacetic Acid Degrading Bacterial Communities". Thesis, University of Exeter, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486770.
Texto completoBrim, Hassan. "Molecular approaches to study bacterial strains and communities of heavy metal polluted soils". Doctoral thesis, Universite Libre de Bruxelles, 1997. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212200.
Texto completo