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Teses / dissertações sobre o tema "Cyanobacteria"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Du, Plooy Schalk Jacobus. "Ecophysiology and nutrient uptake mechanisms facilitating the prolonged bloom persistence by Cyanothece sp. in Lake St Lucia, South Africa." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/7344.

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Cyanobacterial blooms are becoming more frequent worldwide, with possible negative effects on human health. The effects of climate change and eutrophication have been associated with persistent cyanobacterial blooms becoming more frequent. Altered water characteristics, salinity in particular, influence ecosystem dynamics that may lead to conditions conducive to cyanobacterial blooms. The occurrence of an 18-month long Cyanothece sp. bloom (the longest for any cyanobacterium recorded so far worldwide and the first of the genus) from June 2009 to December 2010 in Africa’s largest estuarine lake

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2

Froscio, Suzanne M. "Investigation of the mechanisms involved in cylindrospermopsin toxicity : hepatocyte culture and reticulocyte lysate studies." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phf938.pdf.

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Bibliography: leaves 121-139. The aim of this study was to determine the extent to which protein synthesis inhibition, lowered glutathione (GSH) levels and toxin metabolism contribute to the toxicity of cyclindrospermopsin. Both hepatocyte cultures and reticulocyte lysates were utilized as in vitro tools of investigation. The findings imply that the inhibition of protein synthesis by direct action of the toxin cannot be considered a primary cause of hepatocyte cell death over an acute time frame. Cytochrome P450-derived metabolites may play a crucial role in cytotoxicity, and the toxicity proc

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3

Stewart, Ian. "Recreational exposure to freshwater cyanobacteria : epidemiology, dermal toxicity and biological activity of cyanobacterial lipopolysaccharides /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe.pdf.

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4

Wang, Kai. "INTERACTIONS OF CYANOBACTERIA AND CO-OCCURRING MICROORGANISMS DURING CYANOBACTERIAL HARMFUL ALGAL BLOOMS." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1619622253977384.

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5

Menke, Sharon M. "NifD: Its Evolution and Phylogenetic Use in Cyanobacteria." Miami University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=miami1176983927.

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6

Lindberg, Pia. "Cyanobacterial Hydrogen Metabolism - Uptake Hydrogenase and Hydrogen Production by Nitrogenase in Filamentous Cyanobacteria." Doctoral thesis, Uppsala University, Physiological Botany, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3541.

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<p>Molecular hydrogen is a potential energy carrier for the future. Nitrogen-fixing cyanobacteria are a group of photosynthetic microorganisms with the inherent ability to produce molecular hydrogen via the enzyme complex nitrogenase. This hydrogen is not released, however, but is recaptured by the bacteria using an uptake hydrogenase. In this thesis, genes involved in cyanobacterial hydrogen metabolism were examined, and the possibility of employing genetically modified cyanobacteria for hydrogen production was investigated.</p><p><i>Nostoc punctiforme</i> PCC 73102 (ATCC 29133) is a nitrogen

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7

Berry, Gerald A. "Mosquito Larvicides from Cyanobacteria." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1449.

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Cyanobacteria (blue-green algae) produce a diverse array of toxic or otherwise bioactive metabolites. These allelochemicals may also play a role in defense against potential predators and grazers, particularly aquatic invertebrates and their larvae, including mosquitoes. Compounds derived from cyanobacteria collected from the Florida Everglades and other Florida waterways were investigated as insecticides against the mosquito Aedes aegypti, a vector of dengue and yellow fever. Screening of cyanobacterial biomass revealed several strains that exhibited mosquito larvicidal activity. Guided via b

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8

Bibby, T. S. "Photosynthetic complexes of cyanobacteria." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595520.

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9

Lee, Elvina. "Molecular systematics of cyanobacteria." Thesis, Lee, Elvina (2016) Molecular systematics of cyanobacteria. PhD thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/34883/.

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Cyanobacteria constitute a phylum of ubiquitous cosmopolitan bacteria with the ability to perform oxygenic photosynthesis. Their ancient origins, ecological and economic potential, biotechnological applications and impact on water systems have attracted much interest from the academia, industry, health authorities and regulators. Despite this, cyanobacteria classification and nomenclature still remains difficult. One of the aims of this project was to further our understanding of cyanobacteria systematics by (1) testing polyphasic characterization methods and (2) examining the effect of variou

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10

Williams, Philip. "Chemical investigations of marine cyanobacteria : the search for new anticancer agents from the sea /." Thesis, University of Hawaii at Manoa, 2003. http://hdl.handle.net/10125/6878.

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11

Page, T. S. "Molybdenum independent nitrogenases in cyanobacteria." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638392.

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<I>Anabaena variabilis</I> ATCC 29413, <I>Anabaena cylindrica</I> CCAP 1403/2A, <I>Anabaena</I> sp. PCC 7120, <I>Anabaena</I> sp. UCSB26, <I>Microcoleus chthonoplastes</I> and <I>Calothrix</I> sp. PCC 7601 appear to possess Mo-independent nitrogenases. All of these cyanobacteria grew diazotrophically in the presence of 1 mM tungstate, as well as in medium from which Mo had been carefully removed, whether or not V had been added. In growth media lacking Mo they reduced C<SUB>2</SUB>H<SUB>2</SUB> to C<SUB>2</SUB>H<SUB>6</SUB> as well as C<SUB>2</SUB>H<SUB>4</SUB>. Nevertheless, growth and C<SUB>

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12

Deng, Li. "Cyanophages of bloom-forming cyanobacteria." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492570.

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Cyanobacteria are an important and a diverse group of photo synthetic prokaryotes found in marine, freshwater and terrestrial environments. Over the past two decades, research has shown that cyanobacterial community structures are influenced through infection by cyanobacterial viruses (cyanophages). In marine systems cyanophages have been shown to play roles in the mortality of their hosts, as well as in driving the succession and evolution of phenotypes.

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13

Vijayan, Vikram. "Circadian Gene Expression in Cyanobacteria." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10665.

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Cyanobacteria are photosynthetic prokaryotes that live in aquatic environments. The cyanobacterium Synechococcus elongatus PCC 7942, (hereafter S. elongatus) coordinates its day and night behaviors via a circadian clock. The clock is entrained by light/dark cycles but continues to run in constant light conditions. The core circadian clock in S. elongatus is encoded by post-translational modifications of three Kai proteins, but the extent and mechanism of circadian gene expression are unknown. We provide the first unbiased characterization of circadian gene expression in S. elongatus, demonstra

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14

Nürnberg, Dennis J. "Intercellular communication in filamentous cyanobacteria." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8811.

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Cyanobacteria represent one of the morphologically most diverse groups in the bacterial world, and one of the few where true multicellularity evolved. Their diversity ranges from single cells to branched filamentous forms. Some filamentous cyanobacteria are additionally able to undergo cell differentiation forming a two cell type system that represents the simplest model of multicellularity. Anabaena sp. PCC 7120 has been studied extensively in recent years as a model organism. Under nitrogen deprivation it differentiates photosynthetically-active vegetative cells into heterocysts, specialised

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15

Taylor, George. "Fatty acid metabolism in cyanobacteria." Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/9363.

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With crude oil demand rising and supplies being depleted, alternative energy, specifically biofuels, are of intense scientific interest. Current plant crop based biofuels suffer from several problems, most importantly the use of land needed for food. Cyanobacteria offer a solution to this problem as they do not compete with land for food and produce hydrocarbons that can be used as biofuels. Upon examination of metabolic pathways competing with hydrocarbon synthesis, it appeared that cyanobacteria lacked the major fatty acid degradative metabolic pathway β-oxidation, generally thought to be a

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16

Symes, Elizabeth Anne. "Freshwater Cyanobacteria within Extreme Environments." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15606.

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The proliferation of undesirable cyanobacteria within eutrophic freshwaters is now reported on a global scale, however the factors triggering cyanobacteria bloom formation were found to be especially complex. Even within a single water body, physical, chemical and biological factors all influence the assemblage of phytoplankton found. Notwithstanding the body of research conducted over the past 50 years, where concerted efforts have been applied to observing bloom patterns and the drivers of cyanobacteria blooms, substantial knowledge gaps were identified. An examination of field methods, the

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17

Mesfin, Melaku. "Comparative study of cyanobacteria of desert and semi-desert crusts of two different continents: Africa (Ethiopa) and North America (USA)." Cleveland, Ohio : Cleveland State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1245854204.

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Thesis ( Ph.D.)--Cleveland State University, 2009.<br>Abstract. Title from PDF t.p. (viewed on July 22, 2009). Includes bibliographical references (p. 154-160). Available online via the OhioLINK ETD Center and also avaliable in print.

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18

Dillon, Jesse Gardner. "Cyanobacterial responses to UV irradiance : the synthesis and protective role of scytonemin /." view abstract or download file of text, 2000. http://wwwlib.umi.com/cr/uoregon/preview?9977899.

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Thesis (Ph. D.)--University of Oregon, 2000.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 199-217). Also available for download via the World Wide Web; free to University of Oregon users.

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19

Mihali, Troco Kaan Biotechnology &amp Biomolecular Sciences Faculty of Science UNSW. "Biosynthesis of toxic alkaloids in cyanobacteria." Publisher:University of New South Wales. Biotechnology & Biomolecular Sciences, 2008. http://handle.unsw.edu.au/1959.4/41485.

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Freshwater cyanobacteria produce a wealth of biologically active metabolites, which can adversely affect human and animal health, and cause great economic damage to the fishing, tourism and water-management industries on a global scale. We describe the molecular genetics and biochemistry of biosynthesis for the cyanobacterial toxic alkaloids cylindrospennopsin, paralytic shellfish toxins (PST) and anatoxin-a. Characterisation of the 43 kb cylindrospennopsin biosynthesis gene cluster (cyr), in Cylindrospermopsis raciborskii AWT205 is described. Biosynthesis is initiated via an amidinotransfer o

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20

Bury, Nicolas R. "The effects of cyanobacteria on fish." Thesis, University of Dundee, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367494.

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21

Winder, Jula Susan. "Clycosidase inhibitors from microalgae and cyanobacteria." Thesis, University of Hertfordshire, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303402.

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22

Bojadzija, Savic Gorenka. "Metabolic interactions between Daphnia and cyanobacteria." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1B061.

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Il n'est pas clair si la présence de zooplancton a un impact sur la production de métabolites secondaires chez les cyanobactéries, le stress oxydatif et la physiologie des cyanobactéries. Le zooplancton est capable de développer une tolérance en tant que réponse physiologique aux cyanobactéries et à leurs composés bioactifs, grâce à des mécanismes tels que l'augmentation de l'activité des enzymes antioxydants de stress et des enzymes de détoxification. Cependant, cela s'accompagne d'un coût énergétique qui, à son tour, influence les traits de vie des daphnies et peut nuire à leurs populations.

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23

Dryden, Robert Cumming. "Predation of cyanobacteria by Acanthamoeba spp." Thesis, University of Bath, 1987. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376341.

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24

Axmann, Ilka Maria. "The regulatory potential of marine cyanobacteria." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2007. http://dx.doi.org/10.18452/15598.

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Das Leben auf der Erde wird maßgeblich durch die Kraft der oxygenen Photosythese bestimmt, die Sonnen- in chemische Energie umwandelt. Cyanobakterien wie Prochloro- und Synechococcus zählen zu den wichtigsten primären Produzenten der Ozeane und werden zunehmend als Modelle für photosynthetische Organismen genutzt. Um die Regulationsmechanismen dieser Picocyanobakterien besser zu verstehen, wurde hier die Information von vier Genomen hochgradig verwandter aber dennoch ökologisch unterschiedlich angepasster mariner Stämme genutzt in einer Kombination aus computer-gestützten und experimentellen

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25

Mascia, Francesco. "Engineering ferredoxin-dependent oxyfunctionalization in cyanobacteria." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0648.

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Les cyanobactéries drainent une attention grandissante en tant que photo-biocatalyseurs répondant aux critères de la Chimie Verte. Elles sont capables de croître en utilisant uniquement la lumière et le CO2 comme sources d’énergie et de carbone. L’ajout de donneurs d’électrons sacrificiels (ie glucose) pour le recyclage du cofacteur NADPH d’oxydoréductases n’est pas nécessaire car celui-ci est régénéré par des électrons issus de l'oxydation photosynthétique de l'eau tandis que les oxygenases peuvent utiliser le dioxygène produit in-situ lors de la photosynthèse. Une souche de Synechocystis sp.

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26

Liu, Xuejun, and 劉學軍. "An eco-physiological study of the edible terrestrial cyanobacterium Nostoc flagelliforme: towards successfulartificial cultivation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29514836.

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27

Nagarkar, Sanjay. "The ecology of intertidal epilithic biofilms with special reference to cyanobacteria /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19667218.

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28

Sadeghi, Abbas. "Gene Expression in Two Cyanobacteria, Freshwater Synechococcus sp. PCC 7942 and Oceanic Synechococcus sp. WH 7803, in response to ammonium, nitrate or iron." PDXScholar, 1998. https://pdxscholar.library.pdx.edu/open_access_etds/74.

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The transcriptional response of freshwater Synechococcus sp. PCC 7942 and oceanic Synechococcus sp. WH 7803 to ammonium, nitrate or iron was studied in single or multiple factor limited cultures. Both strains showed maximum production of NiR mRNA when grown in nitrate-containing media. When grown in ammonium-containing medium, they did not show any signal for NiR mRNA synthesis. The influence on the transcription of NiR mRNA by iron as sole limiting nutrient was also evaluated. Iron increased the NiR mRNA whether or not the positive effect of nitrate was already present. The hybridization sign

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29

Ferreira, Ana Helena Ferreira. "Peptides in Cyanobacteria under different environmental conditions." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=979948371.

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30

Zakrisson, Anna. "External Growth Control of Baltic Sea Cyanobacteria." Licentiate thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-90086.

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In the Himmerfjärden Bay a large excess of nitrogen over phosphorus in the discharge from a large sewage treatment plant (STP) has suppressed growth of diazotrophic cyanobacteria in its inner parts. Implementation of nitrogen removal in the STP in 1997 drastically reduced nitrogen load and triggered growth of diazotrophs, mainly Aphanizomenon sp. This study is part of a long-term series of experiments with the overall aim to test how algal biomass and production in a receiving area can be reduced, without stimulating nitrogen fixation and biomass growth by diazotrophic cyanobacteria. Nitrogen

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31

Alambo, Katherine I. "Cyanobacteria North of 60°: Environmental DNA Approaches." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35665.

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Cyanobacterial blooms, such as those recently reported in Great Slave Lake (GSL, NWT), have sparked concern over the occurrence of toxic blooms in the North. This study investigated past and present incidences of cyanobacteria in lakes above latitude 60° N. The abundance of the toxin (microcystin) gene mcyE, as well as genes common to all cyanobacteria (16S rRNA) and bacteria (glnA) were quantified from lake sediment cores using ddPCR. Individual colony isolates from a surface bloom in Yellowknife Bay (GSL) in August 2015 were amplified and identified as non-toxigenic Dolichospermum lemmermann

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32

Bloor, Stephen. "Investigation of extracellular metabolite production by cyanobacteria." Thesis, University of Central Lancashire, 1989. http://clok.uclan.ac.uk/20913/.

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33

Cavaliere, Rosalia Biotechnology &amp Biomolecular Sciences Faculty of Science UNSW. "The regulation of Saxitoxin production in Cyanobacteria." Publisher:University of New South Wales. Biotechnology & Biomolecular Sciences, 2008. http://handle.unsw.edu.au/1959.4/44403.

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Aquatic microalgae produce a variety of toxic secondary metabolites, which are a concern for public health and seafood industries, while also presenting a source of pharmacologically valuable compounds. The present study deals with the physiology and molecular genetics of saxitoxin (STX), a cyanobacterial neurotoxic alkaloid. Ecological and chemical parameters have been investigated for their effects on growth and STX production in the cyanobacterium Cylindrospermopsis raciborskii T3, in order to better understand the physiological responses of this cyanobacterium to the anthropogenic eutrophi

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34

Yeremenko, Nataliya Genadievna. "Functional flexibility of photosystem I in cyanobacteria." [Amsterdam] : Amsterdam : Universiteit van Amsterdam ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/73922.

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35

Joshua, Sarah. "Mobility of pigment-protein complexes in cyanobacteria." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1444430/.

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Phycobilisomes, the light harvesting complexes of cyanobacteria are highly mobile, fluorescent complexes known to diffuse freely on the thylakoid membranes, interacting with the reaction centre complexes to mediate efficient photosynthesis. The primary aim of this project is to establish what processes require this rapid movement of the complexes using a number of genetic, biochemical and microscopic techniques. The cyanobacterial species used extensively in the work presented in this thesis are the fully sequenced, naturally transformable Synechocystis sp. PCC 6803 and Synechococcus sp. PCC 7

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36

Aly, Wafaa S. M. "Novel aspects of iron acquisition in cyanobacteria." Thesis, University of Reading, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553637.

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Database searches revealed that some species of cyanobacteria, such as Synechocystis sp. PCC 6803 and Nostoc sp. PCC 7120, contain homologues of the Fet3p-Ftrlp high-affinity ferrous-iron uptake system, defined originally in the yeast Saccharomyces cerevisiae. These homologues include the ftr (ferric permease homologue, encoding a protein similar to Ftr 1 p) gene in both Synechocystis and Nostoc, and mco (a1l3942 a multicopper oxidase homologue- encoding a protein somewhat similar to Fet3p) found only in Nostoc where it is close to ftr. RT-PCR analysis indicated that ftr and mco in Nostoc are

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37

Zakrisson, Anna. "External Growth Control of Baltic Sea Cyanobacteria." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-112753.

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The overall aim of the study was to provide better insights to the ecological role and impact of cyanobacteria in Baltic Sea (BS) bay, coastal and open sea areas. Biomass and heterocyst development of diazotrophic, heterocystous cyanobacteria were monitored over several years simultaneously as physical parameters such as nutrients and temperature. Nitrogen fixation was estimated as well as its transfer in the BS food web. Even after decades of debate there is still controversy whether eutrophication of lakes and estuaries/coastal areas should be managed by reducing phosphorus only or also nitr

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38

Huang, Hsin-Ho. "Promoter Engineering for Cyanobacteria : An Essential Step." Doctoral thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-206901.

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Synthetic biology views a complex biological system as an ensemble in the hierarchy of parts, devices, systems, and networks. The practice of using engineering rules such as decoupling and standardization to understand, predict, and re-build novel biological functions from model-driven designed genetic circuits is emphasized. It is one of the top ten technologies that could help solving the current and potential risks in human society. Cyanobacteria have been considered as a promising biological system in conducting oxygenic photosynthesis to convert solar energy into reducing power, which dri

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39

Cranenburgh, Rocky M. "HIP1 and gene re-arrangement in cyanobacteria." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339458.

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40

Terasaki, Satoshi. "Phosphorus sensing/acquisition mechanisms in marine cyanobacteria." Thesis, University of Warwick, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416188.

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41

Cozens, A. L. "ATP synthase genes in cyanobacteria and chloroplasts." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383121.

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42

Ridley, Matthew John. "Molecular genetics of coproporphyrinogen oxidase in cyanobacteria." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621544.

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43

Aspinwall, Caroline Liesel. "Photosystem I monomers and trimers in cyanobacteria." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1445270/.

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Photosystem I (PSI) is one of the chlorophyll-protein complexes located in the thylakoid membranes of photosynthetic organisms. It catalyses the oxidation of reduced plastocyanin or cytochrome C6 and reduction of ferredoxin or flavodoxin during photosynthesis. The complex is composed of two core subunits, PsaA and PsaB, which bind electron-carrying cofactors, and numerous low molecular weight subunits. The precise composition of small subunits varies between prokaryotic and eukaryotic PSI and the function of many of these subunits remains unclear. This thesis describes studies of cyanobacteria

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44

Neves, Fabiana Marisa Vieira das. "Cyanobacteria dynamics at Vela lake during 2008." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/882.

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Mestrado em Microbiologia<br>A lagoa da Vela, localizada no litoral Centro Português (Figueira da Foz), é uma lagoa superficial com características típicas de estado trófico avançado, utilizada para actividades recreativas e como fonte de água para a agricultura e pecuária. No presente estudo foi efectuada uma recolha anual (bimensal) de forma a compreender a variação sazonal dos parâmetros ambientais e fitoplâncton, e a influência dos primeiros na variação do fitoplâncton. Os parâmetros ambientais, como temperatura, pH, condutividade, oxigénio (% e dissolvido), nutrientes (nitratos, amónia, f

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Ribeiro, Maria João Xavier. "Marine cyanobacteria: evaluation of the anticancer potential." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10491.

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Mestrado em Biotecnologia Molecular<br>Durante as últimas décadas, as cianobactérias têm ganho importância devido à sua capacidade de sintetizar metabolitos secundários com actividade biológica, úteis no tratamento de inúmeras doenças, tal como o cancro. A caracterização dos metabolitos secundários com aplicações farmacológicas tem sido maioritariamente feita com cianobactérias filamentosas marinhas, do género Lyngbya, Microcoleus e Symploca, recolhidas em áreas tropicais. Contudo, a investigação em cianobactérias marinhas que ocorrem em baixas densidades e em regiões temperadas, como a costa

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Engström-Öst, Jonna. "Effects of cyanobacteria on plankton and planktivores." Helsinki : University of Helsinki, 2002. http://ethesis.helsinki.fi/julkaisut/mat/ekolo/vk/engstrom-ost/.

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Hutchins, David Allen. "Nitrogen and iron interactions in filamentous cyanobacteria." PDXScholar, 1989. https://pdxscholar.library.pdx.edu/open_access_etds/3934.

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The investigations described in this paper are an attempt to further define and quantify the interrelationship of nitrogen fixation and iron nutritional physiology in these two species. Chapter II will present and compare data on nutritional ratios of field collected Trichodesmium colonies and laboratory Anabaena cultures, with the intent of examining possible correlations between observed iron levels and protein nitrogen and chlorophyll concentrations, as well as nitrogen fixation rates. Chapter Ill is an examination of nitrogen fixation and siderophore production in Anabaena with emphasis on

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Overman, Corina Christina Mae. "Modeling Vertical Migration of Cyanobacteria and Zooplankton." PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/5178.

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Cyanobacteria, also known as blue-green algae, often cause harmful algal blooms and release toxic substances that can harm humans and other animals. Accurately modeling these phytoplankton is a step towards predicting, preventing, and controlling such blooms. Cyanobacteria and zooplankton species are known to migrate vertically in the water column on a daily cycle. Capturing this behavior is one aspect of correctly modeling their dynamics. Here, several models of cyanobacteria vertical movement were tested in proof-of-concept models before being applied to data from field studies. These models

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GASTOLDI, LUCIA. "Cyanobacteria Sulfur Metabolism under Precambrian environmental Conditions." Doctoral thesis, Università Politecnica delle Marche, 2020. http://hdl.handle.net/11566/274568.

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Durante il Precambriano, le variazioni di SO42- negli oceani sono state così importanti da ipotizzare che la disponibilità di S abbia influenzato l’evoluzione del fitoplancton. Ho investigato come la regolazione del suo metabolismo nei cianobatteri possa essere cambiata nel tempo, concentrandomi sul primo step della catena assimilativa controllato dalla ATP sulforilasi (ATPS). I cambiamenti ambientali preistorici hanno influenzato la chimica oceanica portando ad un aumento del SO42- disponibile, a una diminuzione del Fe disciolto e ad un aumento nel consumo di equivalenti riducenti. Questi fat

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Everroad, Richard Craig. "Diversification of marine picocyanobacteria : the ecology and evolution of spectral phenotype and phycoerythrin /." view abstract or download file of text, 2007. http://proquest.umi.com/pqdweb?did=1324371891&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.

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Thesis (Ph. D.)--University of Oregon, 2007.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 117-137). Also available for download via the World Wide Web; free to University of Oregon users.

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