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Relevant bibliographies by topics / Extracellular microorganism / Dissertations / Theses

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Dissertations / Theses on the topic 'Extracellular microorganism'

Author: Grafiati

Published: 15 June 2024

Last updated: 31 July 2025

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1

Guilhot, Robin. "Écologie des drosophiles et de leurs symbiotes microbiens en conditions naturelles." Electronic Thesis or Diss., Montpellier, SupAgro, 2020. http://www.theses.fr/2020NSAM0007.

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Les symbioses et le microbiote sont devenus des sujets d’étude prioritaires, souvent explorés grâce à l’organisme modèle Drosophila. Pourtant, nos connaissances des relations naturelles entre drosophiles et symbiotes microbiens, c’est à dire en dehors du laboratoire, sont fragmentaires. Or, comprendre la coévolution entre hôte et symbiotes microbiens nécessite une fine description des effets des partenaires symbiotiques les uns sur les autres. Dans cette thèse, j’ai étudié de façon empirique les interactions entre drosophiles (Drosophila melanogaster et D. suzukii) et symbiotes extracellulaire

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2

Ngom, Marie Odile. "Induction and production of specific extracellular lipases from selected microorganisms." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0031/MQ64416.pdf.

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3

Gaudry, Alexia. "Ιmmunité Végétale : Rôle du piège extracellulaire de racine de deux Fabacées dans les interactiοns entre l'apex racinaire et les micrοοrganismes". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR014.

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Les cellules de la coiffe racinaire et les cellules bordantes et apparentées (AC-DC) libèrent un mucilage principalement composé de glycopolymères, mais également d’ADN extracellulaire. Cette matrice mucilagineuse associée aux AC-DC forme une structure dense, connue sous le nom de piège extracellulaire de racine ou RET, qui entoure l'apex racinaire. Dans cette étude nous avons caractérisé la composition du RET du soja (Glycine max) et du pois (Pisum sativum) par immunomarquages de surface et par chromatographie gazeuse. Les résultats ont montré que les polysaccharides majoritairement présents

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4

Dusny, Christian [Verfasser]. "Microfluidics enable quantitative physiology of individual microorganisms in controlled extracellular environments / Christian Dusny." Aachen : Shaker, 2015. http://d-nb.info/1080763341/34.

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5

Kolba, Clifford Andrew. "Intracellular and extracellular acid phosphatase activity in axenically cultured phosphate-deprived achlorophyllous euglena gracilis /." Access Digital Full Text version, 1994. http://pocketknowledge.tc.columbia.edu/home.php/bybib/11714372.

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Thesis (Ed.D.)--Teachers College, Columbia University, 1994.<br>Typescript; issued also on microfilm. Sponsor: O. Roger Anderson. Dissertation Committee: Patricia L. Dudley. Includes tables. Includes bibliographical references (leaves 119-129).

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6

Reid, Vernita Jennilee. "Extracellular acid proteases of wine microorganisms : gene identification, activity characterization and impact on wine." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20322.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Non-Saccharomyces yeasts of oenological origin have previously been associated with spoilage or regarded as undesired yeasts in wine. However, these yeasts have recently come under investigation for their positive contribution towards wine aroma especially when used in sequential or co-inoculated fermentations with Saccharomyces cerevisiae. These yeasts are also known to secrete a number of enzymes that could be applicable in wine biotechnology. Amongst these enzymes are aspartic proteases. The secreted proteases from some

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7

Kim, Hyun Jung. "The effect of extracellular and surface macromolecules on the deposition of pathogenic microorganisms in saturated porous media." Diss., UC access only, 2009. http://proquest.umi.com/pqdweb?did=1974753331&sid=1&Fmt=7&clientId=48051&RQT=309&VName=PQD.

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8

Kara, Fadime. "Investigation Of Sodium And Potassium Ions In Relation To Bioflocculation Of Mixed Culture Microorganisms." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608488/index.pdf.

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Bioflocculation happens naturally and microorganisms aggregate into flocs during wastewater treatment. It is critical to understand the mechanisms of bioflocculation and its impact on the following solid/liquid separation process since seperation by settling is one of the key aspects that determine the efficiency and the overall economy of activated sludge systems. Bioflocculation occurs via extracellular polymeric substances (EPS) and cations by creating a matrix to hold various floc components together so the cations become an important part of the floc structure. The main objective of this

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9

Gardel, Emily Jeanette. "Microbe-electrode interactions: The chemico-physical environment and electron transfer." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11185.

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This thesis presents studies that examine microbial extracellular electron transfer that an emphasis characterizing how environmental conditions influence electron flux between microbes and a solid-phase electron donor or acceptor. I used bioelectrochemical systems (BESs), fluorescence and electron microscopy, chemical measurements, 16S rRNA analysis, and qRT-PCR to study these relationships among chemical, physical and biological parameters and processes.<br>Engineering and Applied Sciences

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10

Brauge, Thomas. "Étude des exopolysaccharides de la matrice extracellulaire des biofilms de Listeria monocytogenes." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10151/document.

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L’objectif de ces travaux a été d’étudier le rôle des exopolysaccharides dans la formation des biofilms de Listeria monocytogenes et dans leur résistance face à des procédures de nettoyage rencontrées en entreprise dans des circuits fermés. Nous avons montré que l’exopolysaccharide majeur présent dans la matrice extracellulaire des biofilms de L. monocytogenes était de l’acide téichoïque identique à l’acide téichoïque pariétal. Nous avons identifié que sur 93 souches de sérotype 1/2a étudiées la moitié présentaient une mutation sur le gène lmo2550 ce qui pouvait entraîner la non-ramification d

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11

Pous, Rodríguez Narcís. "Bioremediation of nitrate-polluted groundwater using bioelectrochemical systems." Doctoral thesis, Universitat de Girona, 2015. http://hdl.handle.net/10803/302539.

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The presence of nitrates (NO3-) in groundwater is a worldwide concern. The high energy demand and environmental impact of available technologies requires investigating new technologies. This thesis was focused on investigating the usage of bioelectrochemical systems (BES) for treating nitrate-polluted groundwater. BES uses microorganisms able to catalyze oxidation/reduction processes by delivering/obtaining electrons from an electrode. In this thesis, microorganisms able to use the electrode as an electron donor (biocathode) to reduce nitrates into dinitrogen gas (inert) were investigated. As

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12

Haake, Zachary J. "Biogeochemical Gradients within an Acid Mine Drainage-Derived Iron Mound, North Lima, Ohio." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1397816537.

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13

Buchon, Laurent. "Influence de la température sur la physiologie de la croissance et la production d'enzymes exocellulaires chez des bactéries adaptées aux basses températures." Rouen, 2000. http://www.theses.fr/2000ROUES046.

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Des bactéries adaptées au froid ont été sélectionnées pour leur capacité à dégrader des polysaccharides naturels. L'influence de la température de croissance, sur la régulation de la production des enzymes exocellulaires, a été étudiée. Nous avons mis en évidence l'existence de cinq profils de régulation qui ne sont corrélés ni a l'origine taxonomique des souches, ni au type d'activité produite. D'autre part, chez une même souche, le profil de production d'une activité donnée peut varier suivant la composition du milieu de culture, notamment en substrat carboné, ainsi qu'en fonction de la prés

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14

Pierre, Guillaume. "Caractérisation biochimique d’exopolymères d’origine algale du bassin de Marennes-Oléron et étude des propriétés physico-chimiques de surface de micro-organismes impliquées dans leur adhésion." Thesis, La Rochelle, 2010. http://www.theses.fr/2010LAROS314/document.

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Le principal objectif de cette thèse était de mieux comprendre l’importance des Substances Polymériques Extracellulaires (SPE) dans la structuration et la formation des biofilms benthiques ; tout en s’inscrivant dans une étude plus globale des mécanismes écologiques impliqués dans le fonctionnement des vasières intertidales. La mise au point des dosages biochimiques a été effectuée sur le mucilage de l’algue Chaetomorpha aerea et a permis en parallèle de purifier un polysaccharide sulfaté riche en galactose, présentant une activité bactéricide sélective contre la souche Staphylococcus aureus (

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15

Moon, Jonathan Lloyd. "Extracellular proteinases of pathogenic microorganisms." 2005. http://purl.galileo.usg.edu/uga%5Fetd/moon%5Fjonathan%5Fl%5F200512%5Fphd.

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16

Laio, Zi-Yi, and 廖孜翊. "Biosorption of precious metal by microorganisms and their extracellular polysaccharides." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/e2y3vy.

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碩士<br>元智大學<br>生物科技與工程研究所<br>107<br>Precious metals such as gold (Au) and palladium (Pd) are widely used in industrial and biomedical applications. Recovery of these precious metals has become an area of particular interest. Biosorption of these rare metals is of the promising approach for recovery of these metals from industrial wastes. However, these metal ions have also been recognized to possess antimicrobial properties. Microorganisms able to tolerate high concentrations of these metals may facilitate the application of biosorption of these precious metals We evaluate several heavy metal r

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17

Ibrahim, Mukthar. "Role of neutrophil matrix metalloproteinase-9 (MMP-9) and tissue inhibitor of metalloproteases-1 (TIMP-1) in the killing of microorganisms." Thesis, 2003. http://hdl.handle.net/10413/10140.

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Microorganisms may evade killing by neutrophils (PMNs) by altering signal transduction and hence phagosome maturation. Secreted, active matrix metalloproteinases (MMPs) appear to be required for PMN killing of pseudomonas microorganisms, via an MMP and complement-dependent, but otherwise unknown mechanism. This also depends on the absence of the inhibitor of MMPs, tissue inhibitor of metalloproteinases-1 (TIMP-1). By altering their particular complement opsonin and hence the PMN complement receptor bound, microorganism may evade killing, as not all PMN complement receptors trigger phagosome ma

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