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Dissertations / Theses on the topic 'Flagelo bacteriano'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Molero, Andrades Raquel Ángeles. "Implicación de la glicosilación en el ensamblaje del flagelo y las fimbrias de Aeromonas hydrophila AH-1." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/146253.

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El género Aeromonas está constituido por bacilos gram negativos y comprende patógenos de animales poiquilotermos y oportunistas en humanos. La virulencia de Aeromonas hydrophila AH-1 es multifactorial, siendo el lipopolisacárido (LPS), el flagelo (polar y lateral) y la lámina S importantes factores de patogenicidad. La mutación del gen wbpL, implicado en la biosíntesis del antígeno O del LPS, da lugar a la pérdida de antígeno O, una bajada en el peso molecular de las flagelinas polares y la aparición de fimbrias en la superficie bacteriana. Se procedió a estudiar si las flagelinas polares y la
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2

Naalsund, Gjölberg Erik. "Investigation of Arti cial Bacterial Flagella Propulsion." Thesis, KTH, Mekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96529.

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This thesis covers an implementation of the Boundary Element Method (BEM) to simulate an arti cial swimmer at zero Reynolds number. The swimmer has a spheroidal head, and a singular, helically shaped tail, called a agella. By imposing a rotating magnetic eld, the swimmer also rotates. This rotary motion causes the swimmer to propel forward. The implementation is inspired by a real nano robot currently being esearched by a Swiss research group 1. We explain the physical concept behind the swimmer, the governing equations and simpli cations, and the theoretical concepts behind the solution metho
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3

Coombs, Daniel. "Dynamics of travelling helicity fronts in bacterial flagella." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279802.

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Twenty years ago the experiments of Hotani revealed that flagellar polymorphism (the ability of bacterial flagellar filaments to take on different quaternary structures, specifically helices of different handedness and pitch) can be generated by fluid stresses of the same magnitude as those that occur during natural swimming. Experimental work including the recent crystallization of flagellin, as well as theoretical studies, show how the packing properties and underlying bistability of flagellin may give rise to different static structures. Hotani's experiments showed dynamic nucleation and pr
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4

Takahshi, Naoko. "Flagella synthesis in Rhodobacter sphaeroides WS8." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259820.

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5

Manieri, Fernanda Zani [UNESP]. "Estudo da motilidade bacteriana e o papel do flagelo na função da proteína VisP durante a sinalização química e patogênese de Salmonella enterica sorovar Typhimurium." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150832.

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Submitted by FERNANDA ZANI MANIERI null (fernandamanieri@gmail.com) on 2017-06-05T18:55:06Z No. of bitstreams: 1 Dissertação Fernanda Zani Manieri.pdf: 1725459 bytes, checksum: eece7e9f99805d25a8e5ce4b31d531db (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-06-06T16:47:54Z (GMT) No. of bitstreams: 1 manieri_fz_me_arafcf.pdf: 1725459 bytes, checksum: eece7e9f99805d25a8e5ce4b31d531db (MD5)<br>Made available in DSpace on 2017-06-06T16:47:54Z (GMT). No. of bitstreams: 1 manieri_fz_me_arafcf.pdf: 1725459 bytes, checksum: eece7e9f99805d25a8e5ce4b31d531db
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6

Dombrowski, Christopher Charles. "Bacterial Motility: From Propulsion to Collective Behavior." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195677.

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This work explores bacterial motility from the mechanisms of propulsion of an individual cell to the complex behavior of collective motility. The shear modulus of bacterial flagella was measured by stretching isolated flagella with an optical trap and by measuring force extension curves of the stretched flagella shedding light onto the me-chanics involved in the motility of single micro-organisms. Experiments in concentrated suspensions of bacteria show collective behavior with large scale mixing on a time and length scale greater than can be understood from the standard model of "run and t
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7

Green, Charlotte A. "Re-engineering the bacterial flagella secretion system : whipping it into shape." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/16286/.

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8

Sumit, Mohanty. "Fabrication and tracking of Artificial Bacterial Flagella using stereo holographic diffraction." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200937.

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The emerging eld of mobile microrobotics has been suggestive of a plethora ofapplications, from intelligent micromanipulation to diversifying the prospects ofminimally invasive surgeries. Several designs of microrobots have been proposedand are being notoriously studied to enhance the knowledge of their behaviorin dierent environments to cater such applications. At present, control andsurveillance of these microrobots have been aided by the convergence of varioustechnologies like magnetic actuation, microscopy and computer vision. Thequintessential knowledge of their maneuverability could prov
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9

Steager, Edward Brian Kim MinJun. "Actuation and control of microfabricated structures using flagellated bacteria /." Philadelphia, Pa. : Drexel University, 2009. http://hdl.handle.net/1860/3132.

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10

Wolfson, Eliza Briony Kate. "Molecular and functional characterisation of the adherent properties of H7 flagella." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8773.

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Enterohaemorrhagic Escherichia coli (EHEC) have recently emerged as significant zoonotic pathogens. O157:H7 is one of the most common EHEC serotypes associated with human disease, which is transmitted faeco-orally from a bovine reservoir. EHEC O157:H7 preferentially colonises the bovine terminal rectum (BTR). Injection of virulence factors by type-III secretion is necessary for colonisation of cattle and results in re-modelling of the host cytoskeleton. Flagella machinery is evolutionarily related to the Type III secretion apparatus and O157 strains lacking H7 flagella show reduced adherence t
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11

Wang, Xiaoling. "Mechanical analysis and free energy construction of phase transition in bacterial flagellar filaments /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20WANGX.

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12

Lopes, Priscila Diniz [UNESP]. "Avaliação da patogenia de estirpes de Salmonella enterica SUBSP. enterica sorotipo Gallinarum biovar Gallinarum com os genes responsáveis pela expressão de flagelo ativos." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/108642.

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Made available in DSpace on 2014-08-13T14:50:49Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-12-03Bitstream added on 2014-08-13T18:00:25Z : No. of bitstreams: 1 000759978.pdf: 3044978 bytes, checksum: 9f473a1b86cb80664b6c1dbec2f5f431 (MD5)<br>O tifo aviário é uma doença sistêmica provocada por Salmonella enterica subsp. enterica sorovar Gallinarum biovar Gallinarum (SG), bactéria que não possui flagelos. Acredita-se que por não produzir flagelos, SG seria pouco reconhecido pelo sistema imune. Deste modo provocaria inflamação de menor intensidade na mucosa, atravessando as barreir
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13

Lopes, Priscila Diniz. "Avaliação da patogenia de estirpes de Salmonella enterica SUBSP. enterica sorotipo Gallinarum biovar Gallinarum com os genes responsáveis pela expressão de flagelo ativos /." Jaboticabal, 2013. http://hdl.handle.net/11449/108642.

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Orientador: Angelo Berchieri Junior<br>Coorientador: Oliveiro Caetano de Freitas Neto<br>Banca: Rosemeri de Oliveira Vasconcelos<br>Banca: Antonio José Piantino Ferreira<br>Resumo: O tifo aviário é uma doença sistêmica provocada por Salmonella enterica subsp. enterica sorovar Gallinarum biovar Gallinarum (SG), bactéria que não possui flagelos. Acredita-se que por não produzir flagelos, SG seria pouco reconhecido pelo sistema imune. Deste modo provocaria inflamação de menor intensidade na mucosa, atravessando as barreiras intestinais com mais facilidade e assim desencadeando enfermidade sistêmi
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14

Azevedo, Fátima da Piedade de Melo. "Inserção de epitopo heterólogo em diferentes regiões de flagelina bacteriana: influência na função flagelar e imunogenicidade." Universidade de São Paulo, 1997. http://www.teses.usp.br/teses/disponiveis/46/46131/tde-09112015-150421/.

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Uma das estratégias mais promissoras para a biotecnologia de vacinas é o desenvolvimento de linhagens precisamente atenuadas, e que possam ser usadas como carregadoras de antígenos heterólogos. Mutantes de <i}>Salmonella Typhimurium têm sido extensivamente utilizados com essa fmalidade. A flagelina, monômero constituinte do filamento flagelar, vem sendo empregada como carregadora de antígenos heterólogos, inseridos na região central, hipervariável (região IV). Inserções nessa região são freqüentemente funcionais, e levam à exposição do epitopo na superfície do filamento. O presente trabalho ex
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15

Manieri, Fernanda Zani. "Estudo da motilidade bacteriana e o papel do flagelo na função da proteína VisP durante a sinalização química e patogênese de Salmonella enterica sorovar Typhimurium /." Araraquara, 2017. http://hdl.handle.net/11449/150832.

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Orientador: Cristiano Gallina Moreira<br>Banca: Ana Marisa Fusco Almeida<br>Banca: Samar Freschi de Barros<br>Resumo: Salmonella Typhimurium é um patógeno causador de gastroenterite em humanos e outros mamíferos, e sua habilidade de invadir as células epiteliais e replicar-se dentro de macrófagos a torna um importante modelo de estudo de mecanismos de virulência e interação patógeno-hospedeiro. O estudo desta interação baseia-se na sinalização química via hormônios do hospedeiro e do patógeno, e durante a investigação destes processos foi detectada uma nova proteína denominada VisP, relacionad
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16

Andersen-Nissen, Erica. "Toll-like receptor 5 recognition fo bacterial flagellin /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/8341.

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17

Chalmeau, Jérôme. "Contribution from nanotechnologies to the study and assembly of the flagellar nano-motor of bacteria." Toulouse, INSA, 2009. http://eprint.insa-toulouse.fr/archive/00000343/.

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Le nano-moteur qui se trouve à la base des flagelles des bactéries est une merveille de part sa structure et son rôle dans la survie des bactéries. Il permet la mise en rotation rapide (300Hz) d’un long filament à l’extérieur de la bactérie, filament qui va jouer un rôle comparable à une hélice de sous marin. Malgré sa taille, 45 nm dans son plus grand diamètre, cette nano-bio-machine est composée de milliers de protéines, briques essentielles à la vie. Ces protéines travaillent de concert afin de faire tourner le flagelle bactérien et permettre à la bactérie de se mouvoir dans son environneme
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18

Horstmann, Julia Andrea Verfasser], and Petra [Akademischer Betreuer] [Dersch. "The Role of Flagella and Bacterial Motility in Virulence of Salmonella / Julia Andrea Horstmann ; Betreuer: Petra Dersch." Braunschweig : Technische Universität Braunschweig, 2017. http://d-nb.info/1175817368/34.

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19

Holmqvist, Erik. "Macromolecular Matchmaking : Mechanisms and Biology of Bacterial Small RNAs." Doctoral thesis, Uppsala universitet, Mikrobiologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-171642.

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Cells sense the properties of the surrounding environment and convert this information into changes in gene expression. Bacteria are, in contrast to many multi-cellular eukaryotes, remarkable in their ability to cope with rapid environmental changes and to endure harsh and extreme milieus. Previously, control of gene expression was thought to be carried out exclusively by proteins. However, it is now clear that small regulatory RNAs (sRNA) also carry out gene regulatory functions. Bacteria such as E. coli harbor a large class of sRNAs that bind to mRNAs to alter translation and/or mRNA stabili
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20

Chadsey, Meggen Shepherd. "Regulation of the flagellar specific sigma factor, sigma28, of Salmonella typhimurium by the anti-sigma factor FlgM /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/11490.

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21

Bergen, Paul Michael. "Characterisation of the structure and function of the Salmonella flagellar export gate protein, FlhB." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267915.

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Flagella, the helical propellers that extend from the bacterial cell surface, illustrate how complex nanomachines assemble outside the cell. The sequential construction of the flagellar rod, hook, and filament requires export of thousands of structural subunits across the cell membrane and this is achieved by a specialised flagellar Type III Secretion System (fT3SS) located at the base of each flagellum. The fT3SS imposes a crude ordering of subunits, with filament subunits only exported once the rod and hook are complete. This “export specificity switch” is controlled by the FlhB component of
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22

Heo, Minyoung. "Dynamique fonctionnelle du moteur flagellaire bactérien entraîné par des stators marqués par des protéines fluorescentes et par des stators étrangers modifiés par évolution." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT080/document.

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Le moteur flagellaire bactérien (BFM) est un complexe moléculaire qui permet aux bactéries de nager dans un milieu liquide. La rotation du moteur est générée à l’interface entre deux éléments clés: les protéines formant le stator (MotA and MoB) et l’anneau C “switching complex” à la base du rotor. Les stators sont des modules du moteur structurellement et fonctionnellement différentiables du reste du moteur, et leurs association et dissociation dynamique autour du rotor contrôle la génération du couple. Quand une protéine fluorescente (PF) est fusionnée à MotB, le moteur est en état de marche
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23

Zhuang, Xiang-Yu, and 莊翔淯. "Investigating the Growth Mechanism of Bacterial Flagella by Real-time Fluorescent Imaging." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/x45suj.

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碩士<br>國立中央大學<br>生物物理研究所<br>105<br>Bacteria move in the fluid by means of flagella. The flagellar geometry is a hollow tube which outer diameter is about 20 nanometers and the inner diameter is about 2 nanometers to form a helical propeller that produces a thrust force in the fluid. The formation of a flagellum is a one-dimensional self-assembly system. This system uses the ion electromotive force and ATP hydrolysis as the energy sources for the secretion of flagellin subunits. During flagella growth, flagellar monomer delivery to the distal end of the filament and folded into the flagella. To
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24

Shi, Wenyuan. "Regulation of synthesis of flagella in Escherichia coli and bacterial responses to electricity." 1992. http://catalog.hathitrust.org/api/volumes/oclc/28229719.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1992.<br>Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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25

Smith, Lisa Velsor. "The role of flagella in the attachment of bacteria to an abiotic surface /." 2003. http://wwwlib.umi.com/dissertations/fullcit/3073606.

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26

Constantino, Maira Alves. "Investigating effects of morphology and flagella dynamics on swimming kinematics of different helicobacter species using single-cell imaging." Thesis, 2017. https://hdl.handle.net/2144/27383.

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This work explores the effects of body shape and configuration of flagella on motility of Helicobacter pylori, a helical-shaped bacterium that inhabits the viscoelastic gastric mucosa and causes gastritis, ulcers and gastric cancer. Although it is well known that different shapes produce different hydrodynamic drag thus altering the speed and that helical shapes generate additional thrust this has not been quantitatively established for flagellated bacteria. Using fast time-resolution and high-magnification two-dimensional phase-contrast microscopy to simultaneously image and track individual
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27

"Molecular interaction of flagellar export chaperone FliS and its interacting partner HP1076 in Helicobacter pylori." Thesis, 2010. http://library.cuhk.edu.hk/record=b6075073.

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A HP1076 null mutant has been constructed to provide a better understanding of the biological significance of HP1076 in H. pylori . The DeltaHP1076 mutant displays impaired motility and resistance to the antibiotic drug metronidazole. Using a proteomic study, an overall of 40 differentially expressing proteins involved in metabolism and pH homeostasis for bacterial survival, adhesion for colonization, virulence factor to gastric epithelial cells and antigenic proteins have been identified. The virulence factor, Cag pathogenicity island protein (Cag 26) and urease UreA and UreB are confirmed to
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28

Clarke, Marcie B. "The functional characterization of the quorum sensing E. coli regulators B and C in EHEC." 2005. http://edissertations.library.swmed.edu/pdf/ClarkeM121905/ClarkeMarcie.pdf.

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