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Rozprawy doktorskie na temat „Cell membrane stability”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Hartsel, Scott Clifton. "Effect of membrane supramolecular structure on the photoresponse and structural stability of bacteriorhodopsin /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487260531954914.

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2

Park, Doh-Yeon. "Anion-conductive multiblock aromatic copolymer membranes: structure-property relationships." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52172.

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Anion exchange membrane fuel cells (AEMFCs) are an alternative to proton exchange membrane fuel cells (PEMFCs) with potential benefits that include low cost (i.e., platinum-free), facile electro-kinetics, low fuel crossover, and use of CO-resistant metal catalysts. Despite these advantages, AEMFCs have not been widely used because they require more highly conductive anion exchange membranes (AEMs) that do not exhibit impaired physical properties. Therefore, the issues that this research is dealing with are to maximize conductivity and to improve chemical stability. As model materials for these

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Osborn, Angela Michelle. "Investigation of Phase Morphology and Blend Stability in Ionomeric Perfluorocyclobutane (PFCB)/Poly(vinylidene difluoride) (PVDF) Copolymer Blend Membranes." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77265.

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This research is focused on the investigation of phase morphology and blend stability within ionomeric perfluorocyclobutane (PFCB)/poly(vinylidene difluoride) (PVDF) copolymer blend membranes. The morphologies of these unique materials, designed as proton exchange membranes (PEMs) for proton exchange membrane fuel cells (PEMFCs), have been examined not only in the as-cast/as-received state, but also as a function of exposure to various ex-situ aging environments. The morphological investigations used to probe the response of these ionomer blends have been designed to mimic the environment with

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Shah, Siddharth Prakashchandra. "LIPID COMPOSITIONS OF MICROBIAL ORGANISMS ISOLATED FROM EXTREME ENVIRONMENTS AND THEIR IMPLICATION IN THERMO STABILITY OF BACTERIAL CELL MEMBRANE STRUCTURE." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/419298.

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Chemistry<br>Ph.D.<br>Microorganisms with an ability to thrive in harsh environments are referred as “extremophiles”. With advances in biotechnology, interest has grown in the extremophile research because of their unique macromolecules’ characteristics due to their growth environments. Over last decade, researchers have isolated many extremophiles from environments like volcano, salt lakes, hydrothermal vents, deep oceans, Antarctica glaciers etc. Macromolecules of these extremophiles are responsible for their survival in extreme environments. In this research work we have isolated lipid mole

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5

Bandlamudi, Vamsikrishna. "The effect of flow field design on the degradation mechanisms and long term stability of HT-PEM fuel cell." University of the Western Cape, 2018. http://hdl.handle.net/11394/6752.

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Philosophiae Doctor - PhD<br>Fuel cells are long term solution for global energy needs. In current fuel cell technologies, Proton Exchange Membrane (PEM) fuel cells are known for quick start-up and ease of operation compared to other types of fuel cells. Operating PEM fuel cells at high temperature show promising applications for stationary combined heat and power application (CHP). The high operating temperature up to 160°C allows waste heat to be recovered for co-generation or tri-generation purposes. The commercially available PEM fuel cells operating at 160⁰C can tolerate up to 3% CO

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6

Woo, Sahng Hyuck. "Membranes composites acide perfluorosulfonique (PFSA)/argile pour un fonctionnement à faible humidité relative et haute température des piles à combustible à membrane échangeuse de protons (PEMFC)." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM033.

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Cette thèse introduit de nouvelles membranes électrolytiques pouvant fonctionner à faible humidité relative (inférieure à 50%) et à une température intermédiaire, c'est-à-dire 90°C voire au-delà. Plus spécifiquement, la thèse tire profit de l'hygroscopicité de la morphologie d’argiles naturelles, lasépiolite microfibreuse et l’halloysite tubulaire . Ces nanoargiles ont été intégrées à des suspensions de Nafion® ou Aquivion pour préparer des membranes composites. Elles ont été fonctionnalisées et prétraitées pour les rendre conductrices protoniques et améliorer leur compatibilité avec les matri

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7

Galera, Laporta Letícia 1985. "Dynamical aspects of the regulation of bacterial proliferation." Doctoral thesis, Universitat Pompeu Fabra, 2019. http://hdl.handle.net/10803/666296.

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Bacterial proliferation has been studied for more than 100 years, but our knowledge of the mechanisms that control its dynamical aspects is still very limited. In this Thesis we have studied, at both singlecell and population levels, different aspects of the main regulators of bacterial proliferation, namely the cell cycle, biomass production and membrane stability. Our goal has been to shed light on how perturbation of these regulators affects their dynamical responses in a variety of situations. Specifically, we show that the periodic doubling of genes through the bacterial cell cycl

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8

Baradie, Bilal. "Membranes ionomères composites pour piles à combustibles H2/O2 : élaboration et caractérisation." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0002.

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Dans le but de fournir une alternative aux membranes perfluorees pour piles a combustible a electrolyte polymere, plusieurs membranes polymeres a conduction protonique ont ete elaborees et caracterisees leurs proprietes electrochimiques et physiques, notamment leur stabilite mecanique et thermique, ont ete etudiees. La premiere famille de membranes est obtenue, par dispersion d'une poudre inorganique superconductrice protonique (h#3sb#3p#2o#1#4,xh#2o, = 10#-#2s. Cm#-#1) dans une matrice polymere commerciale epdm. Malgre leurs conductivites assez elevees, ces membranes composites ne repondent p

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9

Appelqvist, Hanna. "Lysosomal Membrande Stability and Cathepsins in Cell Death." Doctoral thesis, Linköpings universitet, Experimentell patologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-85008.

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Lysosomes are acidic organelles that are critically involved in a number of physiological processes, including macromolecule degradation, endocytosis, autophagy, exocytosis and cholesterol homeostasis. Several pathological conditions, such as cancer, neurodegenerative disorders and lysosomal storage diseases, involve lysosomal disturbances, indicating the importance of the organelle for correct cellular function. The aim of this thesis was to investigate the role of lysosomes in cell death signaling. Previous studies have shown that permeabilization of the lysosomal membrane and release of hyd

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10

Heyes, Colin D. "Effects of pH, cations and lipids on the structure, stability and function of bacteriorhodopsin." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/30754.

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11

Ben, Youcef Hicham. "Radiation grafted ETFE based membranes for fuel cells : improved mechanical and oxidative stability /." Zürich : ETH/ PSI, 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18215.

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12

Xu, Lang. "Investigating the current/voltage/power/stability capabilities of enzyme-based membrane-less hydrogen fuel cells." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:efef7124-3444-4531-872b-2ee8868e0aa0.

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Fuel cell is a device that can directly convert chemical energy into electrical energy. For low-temperature fuel cells, catalysts are required. Fuel cells using Pt-based or other non-biological materials as catalysts are known as conventional fuel cells. Inspired from Nature, enzymes can be used as catalysts in fuel cells known as enzyme-based fuel cells. The conventional and enzymatic fuel cells share the same underlying electrochemical principles, while enzyme-based fuel cells have their intrinsic advantages and disadvantages due to enzyme properties. The objective of this thesis is to inves

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13

Louesdon, Séverine. "Amélioration de la stabilité biologique de bactéries lactiques et bifidobactéries lyophilisées et caractérisation des réponses physiologiques associées." Thesis, Paris, AgroParisTech, 2013. http://www.theses.fr/2013AGPT0034.

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La production inductrielle de ferments nécessite une étape de stabilisation qui affecte la qualité des cellules. Ce phénomène étroitement lié à l’espèce, voire à la souche bactérienne considérée, dépend également des conditions mises en œuvre lors de la conduite du procédé de production. Dans ce contexte, ce travail de thèse vise à améliorer les performances de Lactobacillus buchneri R1102 et Bifidobacteium longum R0175 à la lyophilisation et au stockage, et à identifier les réponses physiologiques associées.Dans une première partie, l’effet du temps de récolte sur les caractéristiques membran

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14

Sunnick, Eva Maria. "Modell der Bildung und Stabilität von Adhäsionsclustern in biologischen Membranen." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2013. http://hdl.handle.net/11858/00-1735-0000-0001-BB24-2.

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15

Cellier, Julien. "Etude et caractérisations de membranes nanocomposites hybrides pour pile à combustible du type PEMFC." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4001/document.

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La membrane conductrice protonique constitue un rouage essentiel du fonctionnement des piles à combustible PEMFC. Les travaux de recherche présentés dans ce document consistent à développer une membrane non perfluorée basée sur une technologie nanocomposite hybride susceptible d’être produite à faible coût. Cette membrane est composée d’une matrice poly(VDF-co-HFP) dans laquelle sont dispersées des nanoparticules de silice fonctionnalisée par de l’acide poly(styrène sulfonique) (PSSA). Ce travail a porté sur l’étude de la mise en oeuvre de la membrane afin d’obtenir une membrane homogène et de

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16

Zimmermann, Juliane [Verfasser], Andreas [Akademischer Betreuer] Herrmann, Martin [Akademischer Betreuer] Falcke, and Josef [Akademischer Betreuer] Käs. "Modeling the lamellipodium of motile cells : formation, stability and strength of membrane protrusions / Juliane Zimmermann. Gutachter: Andreas Herrmann ; Martin Falcke ; Josef Käs." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2014. http://d-nb.info/1046637193/34.

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17

Sabarou, Hooman. "Thermodynamic Investigation into Chemical Stability of (La,Sr)CrxFe1-xO3-δ and Dual-Phase (La,Sr)CrxFe1-xO3-δ/ stabilized Zirconia for Oxygen Transport Membranes". Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-dissertations/635.

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Ceramics oxides with mixed ionic and electronic conductivity have received a lot of attention due to their wide range of applications in solid oxide fuel cells, interconnects, gas sensors, and ion transport membranes. However, owing to harsh operating conditions, the choice of proper materials and engineering their properties are still challenging. Perovskite and fluorite structures are two promising structures for ceramic membrane applications. The objective of this research is to explore the stability of lanthanum chromite-based perovskite ((La,Sr)(Cr,Fe)O3-δ) as single phases and dual-phase

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18

Marino, Michael G. [Verfasser], and Joachim [Akademischer Betreuer] Maier. "Anion exchange membranes for fuel cells and flow batteries : transport and stability of model systems / Michael G. Marino. Betreuer: Joachim Maier." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2015. http://d-nb.info/1074404912/34.

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19

Luo, Lin. "Novel Nanostructure Electrocatalysts for Oxygen Reduction and Hydrogen Evolution Reactions." University of the Western Cape, 2019. http://hdl.handle.net/11394/7315.

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Philosophiae Doctor - PhD<br>The widespread use of fossil energy has been most convenient to the world, while they also cause environmental pollution and global warming. Therefore, it is necessary to develop clean and renewable energy sources, among which, hydrogen is considered to be the most ideal choice, which forms the foundation of the hydrogen energy economy, and the research on hydrogen production and fuel cells involved in its production and utilization are naturally a vital research endeavor in the world. Electrocatalysts are one of the key materials for proton exchange member

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20

Arvelos, Leticia Ramos de. "Influência de índices hematimétricos e bioquímicos de pacientes submetidas à cirurgia bariátrica sobre a estabilidade de membrana de eritrócitos." Universidade Federal de Uberlândia, 2014. https://repositorio.ufu.br/handle/123456789/15763.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>CHAPTER II: The stability of the erythrocyte membrane, which is essential for maintenance of cell functions, occurs in a critical region of fluidity, which depends largely on its composition and the composition and characteristics of the medium. As the composition of the erythrocyte membrane is influenced by several blood variables, the stability of the erythrocyte membrane must have relations with them. The present study aimed to evaluate, by bivariate and multivariate statistical analyses, the correlations and causal relationship

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21

FREITAS, Márcia Aires Rodrigues de. "Alterações antropométricas, hemodinâmicas, hematológicas e bioquímicas na pré-eclâmpsia." Universidade Federal de Uberlândia, 2017. http://dx.doi.org/10.14393/ufu.te.2018.46.

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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>A pré-eclâmpsia (PE) é classificada em de início (EOPE) e tardio (LOPE) quando presente antes ou após 34 semanas de gestação, respectivamente. Este estudo transversal investigou as diferenças e possíveis associações existentes entre os perfis antropométricos, hemodinâmicos, hematológicos e bioquímicos na pré-eclâmpsia entre os grupos EOPE e LOPE. O estudo incluiu 65 voluntárias admitidas em um hospital universitário no Brasil sendo 29 normotensos (grupo C) e 36 com pré-eclâmpsia (13 com EOPE e 23 com LOPE). O grupo LOPE apr

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22

Hassan, Ayaz. "Estudos de eletrocatalisadores baseados em Pt, Mo e W como ânodos tolerantes ao CO em célula a combustível de membrana trocadora de prótons (PEMFC)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-07052015-094155/.

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Elevada tolerância ao CO e alta estabilidade são necessário para o eletrocatalisador anódico de células a combustível de membrana protônica (PEMFC) para o melhoramento do desempenho do sistema operando com combustível reformado. Neste trabalho eletrocatalisadores suportados em carbono e carbetos (carbetos de molibdênio e tungstênio) foram estudados para a reação de oxidação de hidrogênio (ROH), a tolerância ao CO e a estabilidade no ânodo de PEMFC. Os materiais investigados incluem: PtMo/C, PtMo/C tratado-termicamente, Pt/Mo2C/C, PtMo/Mo2C/C, PtW/C, Pt/WC/C e Pt/C. As diferenças na morfologia

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23

Perazzolo, Valentina. "NITROGEN, SULPHUR AND PLATINUM FUNCTIONAL MESOPOROUS CARBONS: SYNTHESIS, CHARACTERIZATION AND PERFORMANCE TOWARD OXYGEN REDUCTION REACTION." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3424872.

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Proton Exchange Membrane (PEM) Fuel Cells are a promising technology for the clean energy production, especially in the automotive field. Actually, the main commercial catalysts employed in this system are based on Pt Nanoparticles supported on high surface area Carbon. The main issues associated to PEM Fuel Cells deal with the sluggish kinetic of oxygen reduction (ORR) at Platinum based electrode, with the low stability of both the carbon support and the metal phase, that tend respectively to oxidize and dissolve or diffuse and with the high cost due to rare and expensive Pt. In fact, nowaday

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24

Yang, Fan. "Study of catalysts with high stability for proton exchange membrane fuel cells." Thesis, 2015. http://hdl.handle.net/1805/7969.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>The innovation and investigation of catalysts in proton exchange membrane fuel cells are included in this thesis. In the first part of this work, stability of the catalyst support of PEMFC catalyst is investigated. Nanoscale platinum particles were loaded on two different kinds of carbon supports, nano graphene sheets and functionalized carbon black/graphene hybrid were developed by the liquid phase reaction. The crystal structure of two kinds of catalysts was characterized by X-ray diffractometer (XRD). The morphology and particl

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25

Sousa, Nuno André Carvalho. "Materials for solid alkaline fuel cells." Doctoral thesis, 2019. http://hdl.handle.net/10773/28055.

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O principal objetivo deste trabalho é o desenvolvimento de uma nova geração de materiais sustentáveis para células de combustível alcalinas de eletrólito solido (SAFC) e tecnologias de hidrogénio. A tecnologia SAFC oferece vantagens a dois níveis: i) o eletrólito polimérico solido é menos sensível a envenenamento por CO2, e especialmente ii) a cinética das reações de elétrodo é melhorada no meio básico criado na célula, que pode não requerer o uso de catalisadores à base da escassa platina. Estas vantagens implicam desafios. O transporte de OH- é inerentemente mais lento que o de H+, e, portan

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