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Dissertations / Theses on the topic 'Cyanobacteria; Nitrogen fixation'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Klawonn, Isabell. "Marine nitrogen fixation : Cyanobacterial nitrogen fixation and the fate of new nitrogen in the Baltic Sea." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-122080.

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Biogeochemical processes in the marine biosphere are important in global element cycling and greatly influence the gas composition of the Earth’s atmosphere. The nitrogen cycle is a key component of marine biogeochemical cycles. Nitrogen is an essential constituent of living organisms, but bioavailable nitrogen is often short in supply thus limiting primary production. The largest input of nitrogen to the marine environment is by N2-fixation, the transformation of inert N2 gas into bioavailable ammonium by a distinct group of microbes. Hence, N2-fixation bypasses nitrogen limitation and stimul

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2

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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3

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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4

Khamees, H. S. "Effect of some ecological factors on nitrogen fixation by cyanobacteria." Thesis, Swansea University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637784.

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5

Almesjö, Lisa. "Filamentous cyanobacteria in the Baltic Sea - spatiotemporal patterns and nitrogen fixation." Doctoral thesis, Stockholm University, Department of Systems Ecology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7099.

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<p>Summer blooms of filamentous, diazotrophic cyanobacteria are typical of the Baltic Sea Proper, and are dominated by <i>Aphanizomenon </i>sp<i>.</i> and the toxic <i>Nodularia spumigena.</i> Although occurring every summer, the blooms vary greatly in timing and spatial distribution, making monitoring difficult and imprecise. This thesis studies how the spatial variability of Baltic cyanobacterial blooms influences estimates of abundance, vertical and horizontal distribution and N<sub>2</sub>-fixation. Implications for sampling and monitoring of cyanobacterial blooms are also discussed.</p><p

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6

Almesjö, Lisa. "Filamentous cyanobacteria in the Baltic Sea : spatiotemporal patterns and nitrogen fixation /." Stockholm : Department of Systems Ecology, Stockholm university, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7099.

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7

Sinclair, Andrew. "The effect of site directed mutagenesis on energy transduction events in the nitrogenase of Azotoabacter vinelandii." Thesis, University of East Anglia, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389262.

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8

Svedén, Jennie B. "Cyanobacterial Nitrogen Fixation in the Baltic Sea : With focus on Aphanizomenon sp." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-132773.

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Cyanobacteria are widely distributed in marine, freshwater and terrestrial habitats. Some cyanobacterial genera can convert di-nitrogen gas (N2) to bioavailable ammonium, i.e. perform nitrogen (N) fixation, and are therefore of profound significance for N cycling. N fixation by summer blooms of cyanobacteria is one of the largest sources of new N for the Baltic Sea. This thesis investigated N fixation by cyanobacteria in the Baltic Sea and explored the fate of fixed N at different spatial and temporal scales. In Paper I, we measured cell-specific N fixation by Aphanizomenon sp. at 10 ºC, early

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9

Thorsteinsson, Marc Victor III. "Structural and Functional Characterization of Cyanoglobin: A Peripheral Membrane Hemoglobin in Nostoc commune UTEX 584 (Cyanobacteria)." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29827.

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Investigations of the nitrogen fixing (nif) genes in the cyanobacterium Nostoc commune UTEX 584 revealed a gene encoding a hemoprotein, named cyanoglobin. The cyanoglobin gene was isolated and subcloned into Escherichia coli previously. Cyanoglobin possesses a high oxygen affinity. The study presented here investigated the functional role of cyanoglobin, and encompassed the determination of the kinetic basis for the high oxygen affinity of cyanoglobin through kinetic studies utilizing stopped-flow spectrophotometry and flash photolysis. In addition, studies of cyanoglobin, in the presence

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10

Holl, Carolyn Marie. "Regulation of Trichodesmium Nitrogen Fixation by Combined Nitrogen and Growth Rate: A Field and Culture Study." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-11152004-132003/unrestricted/holl%5Fcarolyn%5FM%5F200412%5Fphd.pdf.

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Thesis (Ph. D.)--Biology, Georgia Institute of Technology, 2005.<br>Thomas DiChristina, Committee Member ; Patricia Sobecky, Committee Member ; Christopher Klausmeier, Committee Member ; Douglas G. Capone, Committee Member ; Montoya, Joseph P., Committee Chair ; Samantha Joye, Committee Member. Includes bibliographical references.

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11

Salem, Hassan Samy. "Phylogenetic Analysis of the Symbiotic Nostoc Cyanobacteria as Assessed by the Nitrogen Fixation (Nifd) Gene." Miami University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=miami1282030524.

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12

Schwinnen, Chad Robert. "Impacts of a Herbivorous Fish, Campostoma anomalum (central stoneroller), on Nitrogen Fixation by Benthic Algae." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1284993489.

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13

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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14

Chow, Te-Jin. "Studies on the regulation of nitrogen fixation in cyanobacteria, with specal reference to the effects of oxygen /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu148794150429347.

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15

Chappell, Phoebe Dreux. "The relationship between iron and nitrogen fixation in Trichodesmium spp." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53103.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2009.<br>Includes bibliographical references.<br>Trichodesmium spp. are considered the dominant nitrogen (N) fixing cyanobacteria in tropical and subtropical oceans, regimes frequently characterized by low iron (Fe). Limited information exists about what levels of Fe limit Trichodesmium N fixation. I developed a diagnostic for Fe limitation using quantitative reverse trans

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16

Hashimoto, Ryoya. "Ecological and genomic studies on diazotrophic cyanobacteria in coastal seas." Kyoto University, 2016. http://hdl.handle.net/2433/215604.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第19778号<br>農博第2174号<br>新制||農||1041(附属図書館)<br>学位論文||H28||N4994(農学部図書室)<br>32814<br>京都大学大学院農学研究科応用生物科学専攻<br>(主査)教授左子芳彦, 教授澤山茂樹, 准教授吉田天士<br>学位規則第4条第1項該当

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17

Bauer, Karolina. "Diazotrophy and diversity of benthic cyanobacteria in tropical coastal zones." Doctoral thesis, Stockholm : Department of Botany, Stockholm university, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6572.

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18

Schmidt, Bethany Marie Ms. "Nitrogen Fixation in Lakes: Response to Micronutrients and Exploration of a Novel Method of Measurement." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1524172083482442.

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19

Heithoff, Abigail. "N₂ fixation by subsurface populations of Trichodesmium : an important source of new nitrogen to the North Atlantic Ocean." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/62790.

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Thesis (S.M.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 2011.<br>Cataloged from PDF version of thesis. "February 2011."<br>Includes bibliographical references (leaves 44-48).<br>Trichodesmium, a genus of diazotrophic cyanobacteria, is an important contributor to the marine nitrogen (N) and carbon (C) cycles. The extent to which Trichodesmium dinitrogen (N2) fixation contributes to the marine N cycle has been modeled based on abundance data and rate estimates from

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20

Krupke, Andreas [Verfasser], Marcel [Akademischer Betreuer] Kuypers, and Bernhard [Akademischer Betreuer] Fuchs. "The role of unicellular cyanobacteria in nitrogen fixation and assimilation in subtropical marine waters / Andreas Krupke. Gutachter: Marcel Kuypers ; Bernhard Fuchs. Betreuer: Marcel Kuypers." Bremen : Staats- und Universitätsbibliothek Bremen, 2013. http://d-nb.info/1072156490/34.

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21

Wisén, Susanne. "Characterization of the DNA-Binding Properties of the Cyanobacterial Transcription Factor NtcA." Doctoral thesis, Uppsala University, Department of Biochemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3539.

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<p>Nitrogen is an essential building block of proteins and nucleic acids and, therefore, crucial for the biosphere. Nearly 79 % of the air consists of nitrogen, but in the form of nitrogen gas (N<sub>2</sub>), which cannot be utilized by most organisms. Nitrogen-fixing microorganisms such as cyanobacteria have a central role in supplying biologically useful nitrogen to the biosphere. Therefore, it is important to achieve further understanding of control mechanisms involved in nitrogen fixation and related processes. </p><p>This thesis concerns different molecular aspects of the transcription f

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22

Berntzon, Lotta. "Detection, transfer and role of an environmentally spread neurotoxin (BMAA) with focus on cyanobacteria and the Baltic Sea region." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-118882.

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β-N-methylamino-L-alanine (BMAA) is one of the more recently discovered bioactive compounds produced by cyanobacteria. BMAA is a non-protein amino acid reported present in human brain tissues of patients deceased from a neurodegenerative disease, such as Alzheimer´s disease or amyotrophic lateral sclerosis (ALS). This observation in combination with its neurotoxic effects in eukaryotes (in vivo and in vitro) and its potential to incorporate into (human) proteins, causing protein aggregation, suggests BMAA as a possible causative environmental agent for neurodegenerative diseases. Due to the ub

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23

Flodin, Elin. "Vid vilka förhållanden frodas kvävefixerande cyanobakterier i Mälaren?" Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445902.

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Mälaren är Sveriges tredje största sjö och även den dricksvattentäkt som försörjer flest människor i Sverige med vatten. Ett hot mot Mälarens vattenkvalité är algblomningar då vissa cyanobakterier producerar giftiga cyanotoxiner. Under 60-talet ledde övergödningen i Mälaren till kraftiga algblomningar och för att kunna råda bot på problemet infördes ett övervakningsprogram som nu har följt Mälarens utveckling i snart 60 år. I denna studie undersöktes med hjälp av detta övervakningsprogram vid vilka förhållanden cyanobakterier, framförallt de kvävefixerande Nostocales, frodas i Mälaren. Därefte

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24

Hayes, Nicole M. "Climate and watershed land use as drivers of change in phytoplankton community structure and ecosystem function." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1434464484.

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25

Elardo, Karen Marie. "Changes in Proteins Associated with Nitrogen Fixation and Iron Nutrition in the Marine Cyanobacterium Trichodesmium." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4902.

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This investigation tested the hypothesis that iron, as a micronutrient, will affect proteins in Trichodesmium and therefore affect nitrogen fixation. Changes in proteins that are a result of iron enrichment were compared to naturally occuring diel changes. Alterations in the iron protein of nitrogenase were compared to nitrogen fixation rates using the acetylene reduction technique. The observed changes in proteins were compared in Trichodesmium colonies from the Caribbean Sea and the Sargasso Sea. Trichodesmium colonies were monitored for protein and iron content over a diel period on two cru

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26

Lappalainen, K. M. (K Matti). "Itämeren rehevöitymisen uudistettu diagnoosi ja paradigma." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526219417.

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Abstract The eutrophication of the Baltic Sea continues despite decrease of the external phosphorus load by as much as 80% of the target confirmed by HELCOM. The aim of this thesis is to investigate this paradox, critically evaluate previous explanations for the persistent eutrophication, and to introduce a new diagnosis and paradigm for the causes and processes behind eutrophication of the Baltic Sea. According to the current consensus, anthropogenic nutrient loading is nearly the sole cause of eutrophication and regular cyanobacterial blooms. However, this study shows that the areal phosphor

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27

Vintila, Simina. "Functional genomics of the Baltic Sea cyanobacterium Nodularia spumigena in relation to nitrogen fixation, heterocyst differentiation and toxin production /." Stockholm : Department of Botany, Stockholm University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-29495.

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28

Li, Zhongkui 1963. "Characterization of a non-heterocystous subtropical marine cyanobacterium that produces a unique multicellular structure and facilitates dinitrogen fixation." Thesis, 2007. http://hdl.handle.net/2152/3746.

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A previously un-described filamentous non-heterocystous cyanobacterium was isolated from the South China Sea. Molecular phylogenetic analyses together with morphological observations suggested that this organism should be assigned a new specific epithet. It was designated as Leptolyngbya nodulosa Li et Brand. Filaments were enclosed in a sheath, and were unusual in their flattened appearance as seen in cross section and in the frequent occurrence of a void space (as seen by transmission electron microscopy) between the trichome and the sheath. A distinctive feature of L. nodulosa was the prese

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29

Mella, Herrera Rodrigo Andres. "Heterocyst Morphogenesis and Gene Expression in Anabaena sp. PCC 7120." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-7922.

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Many multicellular cyanobacteria produce specialized nitrogen-fixing heterocysts. During diazotrophic growth of the model organism Anabaena (Nostoc) sp. strain PCC 7120, a regulated developmental pattern of single heterocysts separated by about 10 to 20 photosynthetic vegetative cells is maintained along filaments. Heterocyst structure and metabolic activity function to accommodate the oxygen-sensitive process of nitrogen fixation. This dissertation focuses on my research on heterocyst development, including morphogenesis, transport of molecules between cells in a filament, differential gene e

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30

Monchamp, Marie-Eve. "Rôle de l’azote dans la structure et la fonction des communautés de cyanobactéries toxiques." Thèse, 2013. http://hdl.handle.net/1866/9666.

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Dans cette étude de trois lacs sujets aux efflorescences de cyanobactéries, nous avons examiné la diversité des bactéries diazotrophes et des cyanobactéries toxiques. Nous avons tenté de définir les facteurs environnementaux influençant la composition des communautés phytoplanctoniques, la concentration ainsi que la composition des microcystines (MCs). Nous avons émis l’hypothèse que l’azote jouerait un rôle majeur dans le façonnement des communautés cyanobactériennes et influencerait la concentration et composition des MCs. Des concentrations de cette toxine ainsi que le gène mcyE codant pour

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31

Jungblut, Anne Dorothee Biotechnology &amp Biomolecular Sciences Faculty of Science UNSW. "Characterisation of microbial Mat communities in meltwater ponds of the McMurdo ice shelf, Antarctica." 2007. http://handle.unsw.edu.au/1959.4/40496.

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The investigation presented in this thesis examined the microbial and functional diversity of the meltwater ponds Fresh, Orange and Salt Ponds on the McMurdo Ice Shelf, near Bratina Island, Antarctica. These sites were chosen because of the ecological importance and absence of detailed characterisations of their diversity and function as part of Antarctica?s largest wetland. Particular focus was on cyanobacterial diversity, nitrogen fixation and secondary metabolite production. Using 16S rRNA gene and morphological analysis a large diversity of cyanobacteria (more than 22 phylotypes) was ident

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32

Tall, Laure. "Les transformations microbiennes de l’azote dans les grandes rivières." Thèse, 2012. http://hdl.handle.net/1866/7087.

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Les rivières reçoivent de l'azote de leurs bassins versants et elles constituent les derniers sites de transformations des nutriments avant leur livraison aux zones côtières. Les transformations de l’azote inorganique dissous en azote gazeux sont très variables et peuvent avoir un impact à la fois sur l’eutrophisation des côtes et les émissions de gaz à effet de serre à l’échelle globale. Avec l’augmentation de la charge en azote d’origine anthropique vers les écosystèmes aquatiques, les modèles d’émissions de gaz à effet de serre prédisent une augmentation des émissions d’oxyde nitreux (N2O)

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33

Rodrigues, Kevin J. "The effect of cadmium upon the growth and nitrogen fixation of the cyanobacterium Gloeothece ATCC 27152 /." 1986. https://scholarworks.umass.edu/theses/3397.

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34

Kumar, Krithika. "Regulation of the Nitrogen Fixation Genes in the Heterocystous Cyanobacterium Anabaena sp. Strain PCC 7120." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10458.

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Many multicellular cyanobacteria produce specialized nitrogenfixing heterocysts. During diazotrophic growth of Anabaena (Nostoc) sp. strain PCC 7120, a regulated developmental pattern of single heterocysts separated by about 10 to 20 photosynthetic vegetative cells is maintained along filaments. Heterocyst structure and metabolic activity function together to accommodate oxygensensitive nitrogen fixation, catalyzed by nitrogenase. In this work, we show that the promoter of the nifHDK genes that encode nitrogenase, lies upstream from the intergenic region between nifH and nifU. Excision of t

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35

Yu, Jingjie. "Characteristics of nitrogen fixation in microbial mats from the South Texas Gulf Coast and in a cyanobacterial strain isolated from mats." 2011. http://hdl.handle.net/2152/14049.

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Mature microbial mats from sandy intertidal beaches of the Texas Gulf coast demonstrated substantial levels of nitrogenase activity. Two species of non-heterocystous cyanobacteria, a Hydrocoleum and a Microcoleus, dominated the upper green layer of mature mats. Subsurface layers of cyanobacteria, but not mature mats, appeared during dry seasons. These "proto-mats" contained almost exclusively Microcoleus and demonstrated neither nitrogenase activity nor detectable nitrogenase reductase (Fe-protein). Hydrocoleum, identified from its morphology and 16s rDNA, was isolated and cultivated as unial

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36

Lin, Yen-Huei, and 林艷慧. "The spatial and temporal distributions of nitrogen fixation cyanobacterium Trichodesmium spp. and Richelia intracellularis in South China Sea." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/99206984005283939395.

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碩士<br>國立中山大學<br>海洋生物研究所<br>91<br>Abstract This research investigated the spatial and temporal distributions of Trichodesmium spp. and Richelia intracellularis in the South China Sea. The surveys covered the period from July 2000 to July 2002. A total of eight cruises, including spring, summer and fall were conducted. The sampling stations located between 18~22o N and 115~122 o E , over the continental shelf, the slope, and the basin of the northern South China Sea. Trichodesmium biomass was higher in summer and fall than spring. There was no significant difference in biomass among shelf , slop

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