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Dissertations / Theses on the topic 'Anabaena'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hur, Jae-Seoun. "Effects of air pollution on Azolla-Anabaena symbiosis." Thesis, Lancaster University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359764.

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2

Clark, D. R. "Some aspects of DNA synthesis in Anabaena 2C." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383453.

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3

Arnold, Matthias. "Molekulargenetische Charakterisierung von Untereinheiten des Cytochrom-b6f-Komplexes von Cyanobakterien der Gattung Anabaena." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963645994.

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4

Moslavac, Suncana. "Outer membrane proteins of Anabaena sp. strain PCC 7120." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-72771.

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5

Vargas, Sarah Regina. "Produção de hidrogênio por Chlamydomonas spp. e Anabaena spp." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-21032017-100636/.

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O uso intensificado de combustíveis fósseis como fonte de energia, vê-se a necessidade do desenvolvimento de novas tecnologias, principalmente as renováveis, como o hidrogênio, que possui vantagens por ser elemento abundante no universo, ser renovável e não poluente. A utilização de microalgas e cianobactérias é uma alternativa para a produção de biohidrogênio a partir da quebra da água e de compostos orgânicos. De acordo com isso, nesta pesquisa foram testados diversos fatores físico-químicos e nutricionais nas condições de cultivo de cepas de Chlamydomonas spp. e Anabaena spp. Para tanto, ce

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6

Gerphagnon, Mélanie. "Ecologie des chytrides parasites de la cyanobactérie Anabaena macrospora." Thesis, Clermont-Ferrand 2, 2013. http://www.theses.fr/2013CLF22385/document.

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En raison des forçages anthropiques exercés sur les écosystèmes aquatiques et des effets des changements globaux présents et à venir, on s’attend à une augmentation de la fréquence et de l’intensité des proliférations cyanobactériennes lacustres. Une meilleure connaissance des facteurs biotiques, et notamment du parasitisme, impliqués dans le control des dynamiques cyanobactériennes semble essentielle. Il est désormais établi que les Chytridiomycota (chytrides) constituent les principaux pathogènes fongiques du phytoplancton. Ainsi, les travaux de recherche menés au cours de cette thèse ont eu

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7

Jackson, Gardner H. "Biotransformation of 2,4,6-trinitrotoluene (TNT) by the cyanobacterium anabaena spiroides." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/20862.

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8

Bancroft, I. "An analysis of some cyanophages which infect Anabaena PCC 7120." Thesis, Lancaster University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379568.

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9

Li, Lih-Ann. "Molecular and biochemical studies of rubisco activation in Anabaena species /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487859879938986.

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10

Aldea, Maria Ramona. "Identification of novel regulatory mechanisms controlling heterocyst development in Anabaena Sp. strain PCC 7120." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2996.

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11

Bagatini, Inessa Lacativa. "Associação de bactérias à cápsula de Anabaena spiroides (Cyanobacteria) em cultura." Universidade Federal de São Carlos, 2008. https://repositorio.ufscar.br/handle/ufscar/1936.

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Made available in DSpace on 2016-06-02T19:31:40Z (GMT). No. of bitstreams: 1 1888.pdf: 3636737 bytes, checksum: bdcef6a4d1d6ec63fc8a9a2db7c492bc (MD5) Previous issue date: 2008-05-30<br>Financiadora de Estudos e Projetos<br>The cyanobacterium Anabaena spiroides, a cosmopolitan species occurring in eutrophic environments as in Barra Bonita reservoir, is covered by a thick polysaccharide capsule that provides a microenvironment for association of bacterial communities. The aims of this study were: to identify bacteria attached to A. spiroides capsule to evaluate interspecific relationships amo

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12

Muir, Gillian Morag. "The gene encoding the glyphosate-tolerant EPSP synthase from Anabaena variabilis." Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320276.

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13

Bowness, Peter William. "Intracellular zinc and copper : sequestration and trafficking in Anabaena PCC 7120." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413939.

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14

Agathangelou, Damianos. "Anabaena Sensory Rhodopsin : effect of mutations on the ultrafast photo-isomerization dynamics." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAE001/document.

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ASR, est une protéine photo réceptrice qui lie la base protonée de la rétine de Schiff dans deux conformations de l'état fondamental. La protéine particulière consiste en un système modèle dans lequel I'effet de l'environnement protéique sur la dynamique d'isomérisation des deux isomères peut être étudié. Dans cette thèse, une étude approfondie sur les protéines mutées ponctuellement est présentée, où la variable est l'environnement protéique. Les résultats montrent des différences significatives entre les durées de vie des états excités des deux isomères et les durées de vie plus courtes ou p

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15

Andrade, Carolina Ferreira. "Otimização do cultivo de cianobactérias para a produção de hidrogênio." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-18072017-101318/.

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O hidrogênio (H2) produzido a partir de microrganismos fotossintetizantes (microalgas e cianobactérias) é considerado um vetor energético sustentável do ponto de vista ambiental. Quando comparado a outras formas de produção são encontradas limitações técnicas e econômicas principalmente pela geração de pequenos volumes de gás e pela inexistência de um ciclo de vida completo que assegure a produção contínua de H2 por esses organismos. Nesse sentido, o presente projeto teve por propósito avaliar a capacidade de produção de H2, sob condições mixotróficas, em três estirpes de cianobactérias: Anaba

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16

Green, Damian William, and n/a. "The phytoplankton community in Chaffey Dam, focusing on the influence of light on the growth and photophysiology of the cyanobacterium anabaena circinalis." University of Canberra. Science &Design, 2001. http://erl.canberra.edu.au./public/adt-AUC20060712.155533.

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This research investigated the factors influencing the structure of the phytoplanktori community in Chaffey Dam, which is located in sub-tropical Australia. In particular, the research aimed to determine the influence of light at time scales ranging from seconds to seasons, on the growth and photophysiology of the cyanobacterium Anabaena circinalis. On a large scale, field monitoring programs between 1987 and 1997 indicated that the phytoplankton community of Chaffey Dam was dominated by colonial or relatively large phytoplankton that move either with the aid of flagella or can be positively b

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17

Berg, Holger. "Untersuchungen zu Funktion und Struktur der Cyanophycin-Synthetase von Anabaena variabilis ATCC 29413." Doctoral thesis, [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968889018.

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18

Kanacher, Tobias. "Die Adenylatcyclase CyaB1 aus Anabaena sp. PCC 7120 ist ein cAMP-sensitives Protein." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967492041.

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19

El, Semary Nermin Adel Hussein. "Anabaena and associated bacteria : molecular approaches to studying microbial community structure and taxonomy." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420889.

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20

Burkhart, Brian M. "Structure of Recombinant Flavodoxin from Cyanobacteria Anabaena 7120 determined at 1.40 Å Resolution /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487858417984339.

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21

Zhang, Lichen. "L'étude des mécanismes de l'échange intercellulaire chez la cyanobactérie Anabaena sp. PCC 7120." Thesis, Aix-Marseille 2, 2011. http://www.theses.fr/2011AIX22108.

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La communication intercellulaire se produit non seulement chez les eucaryotes, mais aussi chez certaines bactéries. Un tel exemple est la cyanobactérie filamenteuse Anabaena sp. PCC 7120, capable de former des hétérocystes suite à une carence en azote combiné. Un filament d'Anabaena est coordonné comme une unité multicellulaire; comment les cellules communiquent-elles le long de chaque filament et comment échangent-elles des ressources nutritionnelles demeurent des mécanismes encore mal élucidés. Des études récentes ont démontré que des molécules de petites tailles peuvent être échangées entre

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22

Lyon, Jacob Daniel. "Exploring the mechanism of bioelectrocatalytic production of ammonia with whole cell Anabaena variabilis." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5962.

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Ammonia is an important compound to many industries around the world. Most of the fertilizers used by crop growers have ammonia as an essential ingredient. It can also be useful as a fuel source, offering greater energy density per unit than hydrogen and greater safety. Currently, the predominant method for producing ammonia on an industrial scale is by the Haber-Bosch process. This process uses steam evolution of methane to provide H2 gas, which is then combined with N2 gas over an iron catalyst to form NH3. This process requires large amounts of energy as well as high temperatures and pressu

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23

Oliveira, Ádria Caloto de. "Toxicidade de elementos-traço para consumidores primários na presença de exopolissacarídeos produzidos por organismos fitoplanctônicos (Chlorophyceae e Cianophyceae)." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-06122007-142654/.

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O impacto causado pelo aumento da quantidade de substâncias químicas descartadas no meio ambiente está presente na maioria dos ecossistemas. Poluentes industriais contendo metais são frequentemente transportados para a água, o solo e o ar, podendo-se acumular nas cadeias tróficas e apresentar toxicidade para a biota. Em ambientes aquáticos, a biodisponibilidade e destino dessas substâncias xenobióticas podem ser influenciadas por vários fatores, entre eles a matéria orgânica dissolvida e outros compostos quelantes, os quais tem capacidade de aprisionar ou liberar íons para o ambiente. Os exopo

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24

Pengelly, Jasper John Lobl Biotechnology &amp Biomolecular Sciences Faculty of Science UNSW. "Molecular characterisation of membrane transporters associated with saxitoxin biosynthesis in cyanobacteria." Publisher:University of New South Wales. Biotechnology & Biomolecular Sciences, 2008. http://handle.unsw.edu.au/1959.4/41429.

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The release of the neurotoxic alkaloid saxitoxin by cyanobacterial cells was previously thought to occur primarily after cell lysis, yet recent evidence also suggests active toxin export by membrane transporters. Transporter proteins associated with STX biosynthesis in Cylindrospermopsis raciborskii T3 (sxtF and sxtM) and Anabaena circinalis 131C (naDt) were predicted to be involved in the export of STX from cyanobacterial cells. The main aim of this project was to characterise the transporters associated with STX biosynthesis, by investigation of their genetic prevalence, functional substra

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25

Bui, Lan Ahn. "Optimisation de la production de biomasse et d’ammonium extracellulaire par des cyanobactéries diazotrophes cultivées en photo-bioréacteurs." Nantes, 2013. http://www.theses.fr/2013NANT2100.

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Les propriétés diazotrophiques de cyanobactéries hétérocytées sont étudiées depuis plus de deux décennies pour des applications agricoles. Elles sont actuellement réexaminées comme source d'azote pour la production d'algofuels. L'objectif de ce travail était d'identifier les paramètres cinétiques déterminants pour la production de biomasse et d'ammonium extracellulaire par culture en photo-bioréacteurs d'une cyanobactérie hétérocytée. Différents caractères ont été associés à la production de biomasse et d'ammonium, tels que le taux d'hétérocytes, le profil d'acides gras et les vitesses spécifi

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26

Roy, Partha Pratim [Verfasser], and Tiago [Akademischer Betreuer] Buckup. "Femtosecond Coherent Vibrational Dynamics of Anabaena Sensory Rhodopsin / Partha Pratim Roy ; Betreuer: Tiago Buckup." Heidelberg : Universitätsbibliothek Heidelberg, 2019. http://d-nb.info/1180326660/34.

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27

Sakr, Samer. "Régulation de la différenciation par le cycle cellulaire chez la cyanobactérie Anabaena PCC 7120." Aix-Marseille 2, 2006. http://www.theses.fr/2006AIX22024.

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La cyanobactérie Anabaena PCC 7120 est utilisée comme organisme modèle pour l'étude des processus de différenciation cellulaire chez les procaryotes. En réponse à une carence en azote combiné dans le milieu, cette cyanobactérie filamenteuse différencie en 24 heures des cellules spécialisées dans la fixation de l'azote atmosphérique, les hétérocystes. Un échange de métabolites entres les cellules végétatives et les hétérocystes assurent la croissance des filaments dans des conditions de carence en azote combiné. Les cellules végétatives qui réalisent la photosynthèse approvisionnent les hétéroc

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28

Jones, Karen Lorraine. "Analysis of ferredoxin and flavodoxin in Anabaena and Trichodesmium using fast protein liquid chromatography." PDXScholar, 1988. https://pdxscholar.library.pdx.edu/open_access_etds/3812.

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Iron is an essential nutrient for growth of photosynthetic microorganisms such as cyanobacteria and algae. Iron is required for proteins involved in the important processes of carbon and nitrogen assimilation. Low concentrations of iron in cultures or natural waters can lead to iron limitation which affects many aspects of algal metabolism. In natural waters, iron limitation can have effects on the patterns and rates of primary productivity. The cellular content of certain proteins can be affected by media iron concentrations. Methods have been used that assay components of the cell as an indi

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29

Padovan, Armando V. "The production of geosmin by Anabaena circinalis (Rabenhorst), and its measurement by sensory analysis /." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09MS/09msp124.pdf.

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30

Honda, Ricardo Yukio. "Caracterização morfológica e molecular de cianobactérias do gênero Anabaena isoladas de corpos d\'água brasileiros." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-24062009-085724/.

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Com o advento dos estudos moleculares evolutivos baseados nas sequências dos genes de RNAr 16S em cianobactérias, a taxonomia de Anabaena (Cyanobacteria) tem sido amplamente discutida e uma revisão deste gênero faz-se necessária. Os problemas variam desde o nível genérico, tal como o grupo Anabaena Aphanizomenon, até níveis de diferenciação de linhagens (morfoespécies). Estudos moleculares de linhagens de Anabaena isoladas de ecossistemas brasileiros são inexistentes. A fim de se explorar a diversidade, filogenia e diversificação evolutiva de Anabaena isoladas de ambientes brasileiros, estudo

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31

LE, BAY-LE DOARE JOCELYNE. "L'Association symbiotique Azolla-Anabaena : effets de la salinité et importance d'un nouveau partenaire : Corynebacterium sp." Rennes 1, 1991. http://www.theses.fr/1991REN10118.

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Azolla est une fougere aquatique qui etablit une symbiose avec une cyanobacterie fixatrice d'azote: anabaena azollae. Nous avons mis en evidence la presence d'un autre partenaire dans la symbiose, une bacterie non chlorophyllienne et apparemment non fixatrice d'azote corynebacterium sp. Dans l'association, les plantes fournissent le carbone (saccharose), les cyanobacteries fournissent l'azote (ammoniaque) et les corynebacteries fourniraient un hormone de croissance vegetale. L'association est non halophile et sensible au stress salin. Sa culture sur milieu sale (nacl 0,15 m) conduit a l'entree

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32

Barbosa, Ana Teresa Perdigão. "Produção de Biohidrogénio pela cianobactéria Anabaena sp. PCC 7120 e mutantes: efeito do ciclo de luz (dia/noite) e da intensidade luminosa." Master's thesis, Faculdade de Ciências e Tecnologia, 2009. http://hdl.handle.net/10362/5094.

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33

Hodge, Sarah Anne. "The study of protein serine/threonine kinase mediated phosphorylation in the cyanobacterium Anabaena sp. strain PCC7120." Thesis, University of Warwick, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284030.

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34

Diogo, Elsa Maria dos Santos. "Utilização de Algas na produção de bioetanol." Master's thesis, Instituto Politécnico de Tomar, 2012. http://hdl.handle.net/10400.26/5849.

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Este trabalho, desenvolvido no contexto de estágio curricular nos laboratórios de Engenharia Química e Ambiente do Instituto Politécnico de Tomar, teve como principal objectivo estudar a potencialidade de produzir biomassa algal, de forma integrada no processo de tratamento de águas residuais através de zonas húmidas construídas. Neste âmbito, desenvolveram-se actividades predominantemente de foro experimental segundo três vertentes: a implementação ou validação de técnicas analíticas, tais como a determinação da concentração de nutrientes na fase aquosa, o teor de biomassa em termos secos e o

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35

Tremblay, Robin Lee. "Expression and characterisation of a gene encoding RbpD, an RNA-Binding protein in Anabaena sp. strain PCC 7120 /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0019/MQ54968.pdf.

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36

Chu, Ngoc Thuy. "Association symbiotique d'une algue bleue (Anabaena azollae Strasburger) et d'une fougère (Azolla filiculoides Lamarck) : étude écologique et physiologique." Paris 11, 1986. http://www.theses.fr/1986PA112170.

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37

Pinzon-Gamez, Neissa M. "HETEROCYSTOUS N2-FIXING CYANOBACTERIA: MODELING OF CULTURE PROFILES, EFFECT OF RED LIGHT, AND CELL FLOCCULATION STUDY." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145115095.

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38

Paschkewitz, Timothy Michael. "Ammonia Production at Ambient Temperature and Pressure: An Electrochemical and Biological Approach." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/4893.

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The majority of power generated worldwide is from combustion of fossil fuels. The sustainability and environmental impacts of this non renewable process are severe. Alternative fuels and power generation systems are needed, however, to cope with increasing energy demands. Ammonia shows promise for use in power generation, however it is costly to produce and very few methods of using it as a fuel are developed. To address the need for alternative methods of ammonia synthesis, this research designed and tested a bioelectroch

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39

Kang, Wenli. "Kinetic study of ammonium/ammonia production by Anabaena variabilis cultures in relation with a continuous gas stripping." Thesis, Nantes, 2016. http://www.theses.fr/2016NANT4041/document.

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Certaines cyanobactéries photoautotrophes sont capables de fixer l’azote atmosphérique grâce à des cellules spécialisées, les hétérocytes. De plus, en aérobiose, comme ces cellules peuvent excréter de l’ammonium lorsque leurs activités glutamine synthétase sont partiellement inhibées. Elles sont considérées comme usines cellulaires potentielles pour une bioproduction d’engrais azoté. Nous utilisons une souche mutante de Anabaena variabilis PCC 7937-C9, cyanobactérie hétérocytée à taux de croissance élevé, pour étudier la capacité à produire de l’ammonium en photobioréacteurs. Les caractéristiq

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40

Crawford, Kathryn A. "The Effects of Nutrient Ratios and Forms on the Growth Of Microcystis aeruginosa and Anabaena flos-aquae." ScholarWorks @ UVM, 2008. http://scholarworks.uvm.edu/graddis/59.

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Cyanobacteria are ancient prokaryotic organisms capable of performing oxygenic photosynthesis. An increase in the temporal and spatial distribution of cyanobacteria blooms worldwide has drawn considerable research attention in recent decades because of the health risks cyanobacteria pose to humans and wildlife through the production of cyanotoxins, interference with recreation, and ecosystem changes. A variety of hypotheses have sought to explain the increasing frequency and severity of cyanobacteria blooms around the world, with the relationship between cyanobacteria abundance and eutr

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41

Prentice, Matthew James. "Temporal and spatial variations of cyanobacteria in Karori Reservoir, Wellington." The University of Waikato, 2008. http://hdl.handle.net/10289/2363.

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The Lower Karori Reservoir (LKR) is a small, monomictic lake of 2.34 ha situated in the Karori Wildlife Sanctuary (KWS), Wellington. Over the past decade cyanobacterial blooms have become a common occurrence in this water body. In 2005 Anabaena planktonica was detected for the first time in the LKR and this species now forms dense blooms during summer. These blooms are problematic as they reduce aesthetic appeal and have resulted in odour problems for visitors to this high profile wildlife sanctuary. The objectives of this study were to identify key physical, chemical and biological variab

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42

Santos, Roseli Machado dos. "Perda de matéria orgânica dissolvida por células flutuantes de cianobactérias potencialmente tóxicas expostas a altas intensidades de luz." Universidade Federal de São Carlos, 2006. https://repositorio.ufscar.br/handle/ufscar/1913.

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Made available in DSpace on 2016-06-02T19:31:36Z (GMT). No. of bitstreams: 1 1260.pdf: 1503714 bytes, checksum: 556c38596d4d4ea47b6d75a7441691bd (MD5) Previous issue date: 2006-08-28<br>Universidade Federal de Sao Carlos<br>Anabaena spiroides and Microcystis aeruginosa are cyanobacteria that frequently bloom in Barra Bonita Reservoir. These floating organisms and the characteristic turbulence found at the reservoir exposure the cells to higher light intensities by lifting them from lower depths in the photic column to surface. The sudden exposure at higher irradiance could cause photoinhibit

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43

Choueri, Rodrigo Brasil. "Consumo e influência de exopolissacarideos de Anabaena spiroides (Cyanophyceae) sobre a toxicidade e captura do cobre por Ceriodaphnia cornuta (Cladocera, Daphnidae)." Universidade Federal de São Carlos, 2004. https://repositorio.ufscar.br/handle/ufscar/2068.

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Made available in DSpace on 2016-06-02T19:32:03Z (GMT). No. of bitstreams: 1 DissRBC.pdf: 967066 bytes, checksum: 70991b6b98884e4372060fd788d5c4d4 (MD5) Previous issue date: 2004-05-13<br>Financiadora de Estudos e Projetos<br>Human specie can alter deeply and very fast the enviroment in which it is in. Because of the industrial development, the water, air and soil contamination have become cause of concern, chiefly in big cities with great populations. Among the contaminants figure the heavy metals, which levels at aquatic and terrestrial ecossistems are growin up every year. These elements

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44

Aryal, Deepak Aryal. "Evaluating The Effectiveness Of Algaecide In A Continuous Flow Through System." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533137036461609.

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45

Brookes, Justin Dean. "The influence of nutrients and light on the metabolic activity and buyoancy of Microcystis aeruginosa and Anabaena circinalis /." Title page, contents and summary only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phb8711.pdf.

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46

Howell, Larry Daniel II. "Characterization of IphP from Nostoc commune UTEX 584 and a Dual Specificity Protein Phosphatase from Anabaena PCC 7120." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30344.

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Protein phosphorylation is utilized universally as a mechanism of signal transduction. However, the use of tyrosine phosphorylation by bacteria has been a matter of dispute. Conventional wisdom dictated that "prokaryotic phosphorylation" was typified by phosphorylation of histidine and aspartate residues of proteins, while "eukaryotic phosphorylation" was characterized by modification of serine, threonine, or tyrosine residues. Increasing numbers of reports have emerged challenging the traditional view of "prokaryotic" and "eukaryotic" phosphorlyation

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Marques, Ana Cristina Evangelista. "Produção de biohidrogénio por cianobactérias: optimização da produção de biohidrogénio pela Anabaena sp. PCC 7120 wild type e mutantes." Master's thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/12332.

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48

Morales, Renaud. "Association et dissociation de deux protéines de la photosynthèse : étude cristallographique du complexe ferrédoxine NADP+ réductase/ferrédoxine chez Anabaena PCC7119." Grenoble 1, 2000. http://www.theses.fr/2000GRE10251.

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La ferredoxine-nadp + reductase (fnr) catalyse l'etape terminale de la photosynthese qui transforme l'energie lumineuse en energie chimique. La fnr utilise deux electrons de haute energie photoproduits par le photosysteme i (psi) et transportes, un par un, par une ferredoxine reduite pour permettre la reduction du nadp + en nadph. Le pouvoir reducteur du nadph est ensuite utilise dans les mecanismes d'assimilation du carbone. Dans un premier temps, nous nous sommes interesses a l'etude cristallographique de la fnr et de la fd isolees et dans leurs differents etats d'oxydoreduction. Les structu

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Darnajoux, Romain Nicolas Xavier. "Étude de l'homéostasie des micronutriments de la fixation d'azote au sein de la symbiose lichénique en forêt boréale." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/7572.

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L’azote est un des éléments les plus importants dans la nature. Sa disponibilité limite la productivité d’un grand nombre d’écosystèmes naturels, et influencera sans doute de manière importante leurs réponses aux changements climatiques globaux. La première source d’azote dans les écosystèmes non anthropisés est la fixation biologique de l’azote. Ce processus repose sur un groupe de métallo-enzymes spécifiques, les nitrogénases, dont le cofacteur métallique contient soit du fer et un atome de molybdène, soit du fer et un atome de vanadium, soit uniquement du fer. A ce jour, seule la nitrogénas

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Bringuier, Charline. "Effet des changements climatiques et atmosphériques sur la croissance et la fixation biologique de l'azote chez Anabaena variabilis : importance des disponibilités du molybdène et du phosphore." Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8790.

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La fixation biologique d’azote réalisée par les cyanobactéries est un processus important dans les écosystèmes où la productivité est limitée par la disponibilité de l’azote. Dans des conditions de changements globaux, l’augmentation du CO2 atmosphérique pourrait engendrer une augmentation des taux de fixation d’azote permettant de combler la demande croissante d’azote nécessaire à la croissance. Cependant cette augmentation des taux de fixation d’azote pourrait dépendre des disponibilités en molybdène (Mo) et en phosphore (P), mais également être contrebalancée par l’azote minéral apporté via

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