Tesi sul tema "Interface membrane"
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Britt, Hannah Mary. "Reactivity at the membrane interface". Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12787/.
Luo, Yuzhong. "Membrane extraction with a sorbent interface". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq38251.pdf.
Danial, John Shokri Hanna. "Imaging lipid phase separation on droplet interface bilayers". Thesis, University of Oxford, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711943.
Ge, Changrong. "Property-controlling Enzymes at the Membrane Interface". Doctoral thesis, Stockholms universitet, Institutionen för biokemi och biofysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-61988.
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 5: Manuscript.
Co, Carl. "N-WASP at the membrane-actin interface". Diss., Search in ProQuest Dissertations & Theses. UC Only, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3251943.
Lindahl, Erik. "Computational Modeling of Biological Membrane and Interface Dynamics". Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3141.
Hwang, William. "Droplet interface bilayers for the study of membrane proteins". Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:0ba680ba-75f1-4cd9-9600-3e251b948a3d.
Franz, João Paulo Vicentini. "Interface : a projeção como membrana semipermeável". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/184850.
The research, "Interface: projection as semipermeable membrane", approaches a process of artistic creation that originated in the beginning of 2011. The works, initially thought as videos, by which it was tried to break with the narrative structure of traditional cinema, were modified in the course of the research, thus covering the view on the installation that contained the video and the projection. Then proceeded to explore different spatial presentation situations in the proposed installations, often using computational resources of projective modeling such as smoothing projection areas, delimiting the projective range and inserting multiple videos, as well as experimenting with interferences projections. In order to reflect on the work developed, it was used some artists and authors who discuss the exhibition space and how the observer relates to him, such as Thommas Zummer, Andre Parente, Malcolm Le Grice and Philippe Dubois. Through the concepts of projection, interface and membrane - approached from different perspectives of knowledge - the installation space was considered in a multidirectional relation between the observer and the exhibition space.
Danial, John Shokri Hanna. "Imaging lipid phase separation in droplet interface bilayers". Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:34bb015f-2bc1-43bb-bc29-850e0b55edac.
Foster, Simon Edward. "Routes to interfacial deposition of platinum microparticles in solid polymer fuel cells". Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/28053.
Bansal, A. "The interferometric study of liquid transport across membranes". Thesis, University of Surrey, 1988. http://epubs.surrey.ac.uk/847237/.
Wang, Fang. "Peptide channel redesign: mutations of gramicidin A at membrane-water interface". Thesis, Boston College, 2012. http://hdl.handle.net/2345/3411.
My graduate research focuses on engineering and characterizing gramicidin A (gA), a natural fifteen-residue transmembrane channel peptide. It consists of D- and L- amino acids at alternate positions. gA is believed to fold into a β-helix in membranes, and two folded monomers at each leaflet of the lipid bilayer dimerize to form a transmembrane channel. gA shares the common features of other known membrane channels: a well defined structure that only allows the passage of specific ions, a gating mechanism, and a high abundance of aromatic residues. This dissertation includes two subprojects: I. Understanding Channel Formation: Aromatic Modifications of Gramicidin A Channel Ion channels are key elements in signaling and molecule transport, and therefore crucial for normal function of cells. Defective ion channels are known to be responsible for a number of diseases. Although hundreds of crystallographic structures of membrane proteins have been deposited into the PDB in the past few decades, our knowledge on this large family of proteins is still limited and mostly descriptive. Study of small peptides in model membranes is a good simplification of the more complex biological systems. In chapter 1, I will introduce my research using gA as a model system to understand the significant role of aromatic residues in membrane channel structure formation. Channel activities of these gA-Ar mutants were evaluated by ion leakage assays. The structure activity relationship of a library of gA mutants was discussed. The alternating chirality of amino acids was proven to be essential for gA channel activity. Several additional interesting observations are discussed. II. Towards Bacterium Specific Ion Channels: Solublized Gramicidin A as Potential Systemic Antibiotics The rapid development of multidrug resistance by pathogenic bacteria poses a serious threat to society and demands new antibiotics with different mechanisms. Often considered as a model transmembrane channel, gA also has proven antibiotic activities. The gA channel facilitates passive diffusion of water and monovalent cations (e.g. H+, Na+, K+) thus killing bacteria by disrupting the ion gradient across the cell membrane. However because of its poor solubility and high toxicity, its medicinal application as an antibiotic has been limited to topical reagents. A detailed understanding of gA allows rational optimization of the gA-WT to potential systemic antibiotics. Bacterial membranes are composed of a large fraction of anionic species, therefore, we hypothesize that strategic incorporation of cationic residues into gA will afford bacterium-specific toxicities. In addition, the charged residues will greatly improve the water solubility of gA. In chapter 2, I will introduce my research on developing soluble and bacterium specific gA as a potential systemic antibiotic. We firstly incorporated D-Lys at the C-terminus to obtain our first generation of gA based antibiotics. The best candidate (D-Leu10,12,14D-Lys gA) shows significantly increased water solubility (~ 1, 000 times) and therapeutic index (˃ 50 times). Modifications on the Lys side chain were then carried out to fine tune the antibiotic activities of these cationic gA. My research has pointed out a possible strategy to convert hydrophobic membrane channel peptides into potential systemic antibiotics. In addition to targeting the negative charges of bacterial membranes with cationic gA mutants, we proposed a novel strategy in which boronic acid is used to chase after the 1,2-diol substructure in the PG headgroup through boronate ester formation. Polyvalent display of boronic acids on a peptide scaffold results in enhanced binding with diols, showing promise of the boronate approach in the development of bacterium specific reagents
Thesis (PhD) — Boston College, 2012
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Duckney, Patrick James. "Functional analysis of NET2A at the actin-membrane interface of plants". Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12130/.
Maltseva, Elena. "Model membrane interactions with ions and peptides at the air,water interface". Phd thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976724537.
Gross, Linda C. M. "Applications of droplet interface bilayers : specific capacitance measurements and membrane protein corralling". Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:0b7ffba6-b86d-499c-a93f-3b2fc46a427b.
Bhumbra, Rej-Paul. "Sealing the bone-implant interface around total hip replacements using guided bone regeneration". Thesis, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313796.
Yuen, Christopher Tze Kiu. "Bacteriophage M13 major coat protein, roles of aromatic residues at the membrane-water interface". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0021/MQ45882.pdf.
Washo, Dawn Llewellyn. "Using membrane interface probe (MIP) to characterize chlorinated volatile organic compounds in glacial sediments". Diss., Online access via UMI:, 2009.
Schmidt, Piet O. "Origins of Effective Charge of Multivalent Ions at a Membrane/Water Interface and Distribution of 2,3,4,5-Tetrachlorophenol in a Membrane Model System". PDXScholar, 1995. https://pdxscholar.library.pdx.edu/open_access_etds/5049.
Najem, Joseph Samih. "Droplet Interface Bilayers for Mechano-Electrical Transduction Featuring Bacterial MscL Channels". Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/83399.
Ph. D.
Fossati, M. "MECHANISMS OF PROTEIN TRANSPORT AT THE ER-GOLGI INTERFACE". Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/214981.
Punnamaraju, Srikoundinya. "Voltage and Photo Induced Effects in Droplet-Interface-Bilayer Lipid Membranes". University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1321648604.
Segal, Alina. "Development of membrane extraction with a sorbent interface for the analysis of environmental and clinical samples". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ65260.pdf.
Barlow, Nathan. "Droplet interface bilayers : on the theory and application of the small molecule passive membrane permeability assay". Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/57509.
Mrad, Christine. "Caractérisation ex-situ par RMN et IRM des transferts d'eau à l'interface membrane/électrode dans les piles à combustible PEMFC". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0358.
In the context of sustainable energy transition, Proton Exchange Membrane Fuel Cells (PEMFC) are considered promising alternatives to conventional engines. They offer efficient conversion of hydrogen into electricity without emitting pollutants. However, for the widespread deployment of these systems, it is essential to reduce their cost and improve their durability. This is the focus of the European project « ALPE: Advanced Low-Platinum hierarchical Electrocatalysts for low-T fuel cells », in which this thesis is situated. The project aims to reduce the cost of PEMFCs by decreasing the amount of platinum (Pt), catalyst used in their electrodes, targeting a reduction of 1.5 to 2 times compared to the state of the art in 2019. The operation of PEMFCs relies essentially on the electrochemical reactions occurring on the Pt catalytic sites, and proton transport is closely linked to the hydration state of the electrolyte membrane (water serving as a vector for protons). Therefore, the objective of this thesis is to study the impact of reducing the amount of Pt on the water transport phenomena across the membrane-electrode/air interfaces. In order to achieve this goal, experimental devices and methodologies for analyzing the membrane/electrode interface through spectroscopy and magnetic resonance imaging (NMR/MRI) have been developed. Initially, the study focuses on the examination of a single Nafion® membrane (N1110). An in-situ analysis that allows visualization of the impact of the membrane's hygrothermal history on the properties of water is presented. Furthermore, experiments under different relative humidity conditions on each side of the membrane demonstrate the capability of our approach to quantify interfacial resistances of water transfer while decoupling them from diffusive effects within the membrane. Additionally, a 1D steady-state model of the diffusion of water across the thickness of the membrane allows to determine the evolution of the mutual water diffusion coefficient. To complement our analysis, a partial acquisition measurement sequence has been designed to minimize the acquisition time of water profiles within the membrane, paving the way for a transient study. Finally, a comparison of interfacial resistances between a single membrane and a membrane with electrode(s) provides insights into the impact of adding an electrode deposit and varying the platinum loading on water transport phenomena. The results highlight that in transient conditions, there are no significant differences between a single Nafion® membrane and a membrane/electrode assembly (with one or two electrodes). However, it appears that the presence of the electrode and the amount of platinum seem to influence the evolution of interfacial resistances depending on the relative humidity (RH) of the air supplied to the sample
Fujita, Katsuhiko. "Supramolecular Assembly Containing α-Helical Peptide Molecules in Lipid Bilayer Membrane and at the Air/Water Interface". Kyoto University, 1995. http://hdl.handle.net/2433/160763.
Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第6024号
工博第1421号
新制||工||985(附属図書館)
UT51-95-D343
京都大学大学院工学研究科高分子化学専攻
(主査)教授 今西 幸男, 教授 砂本 順三, 教授 田中 渥夫
学位規則第4条第1項該当
He, Tao. "I. Exploration of Amphitropic Protein Interactions at the Membrane Interface; II. DNF2—A Plant Protein with Homology to Bacterial PI-PLC Enzymes". Thesis, Boston College, 2015. http://hdl.handle.net/2345/bc-ir:104815.
Amphitropic proteins, such as the virulence factor phosphatidylinositol-specific phospholipase C (PI-PLC) from Bacillus thuringiensis, often depend on lipid-specific recognition of target membranes. However, the recognition mechanisms for zwitterionic lipids such as phosphatidylcholine (PC), which is enriched in the outer leaflet of eukaryotic cell membranes, are not well understood. Molecular dynamics (MD) simulation and mutagenesis results strongly indicate that PI-PLC interacts with PC head groups via cation-π interactions with aromatic tyrosine residues, and suggest that cation-π interactions at the interface may be a mechanism for specific lipid recognition by amphitropic and membrane proteins. Aromatic amino acids can not only form cation-π interactions at the interface but also insert into membranes and have hydrophobic interactions with lipid tails. Heretofore there has been no facile way to differentiate these two types of interactions. We show that specific incorporation of fluorinated amino acids into proteins can experimentally distinguish cation-π interactions from membrane insertion of the aromatic side-chains. Fluorinated aromatic amino acids destabilize the cation-π interactions by altering electrostatics of the aromatic ring while their enhanced hydrophobicity enhances membrane insertion. Incorporation of pentafluorophenylalanine or difluorotyrosine into a Staphylococcus aureus phosphatidylinositol-specific phospholipase C (PI-PLC) variant engineered to contain a specific PC-binding site demonstrates the effectiveness of this methodology. Applying this methodology to the plethora of tyrosine residues in Bacillus thuringiensis PI-PLC identifies those involved in cation-π interactions with PC. Cation-π interactions provide a likely molecular mechanism for BtPI-PLC PC specificity but do not account for its preference for bilayers containing a small fraction of anionic lipids. MD simulations and fluorescence correlation spectroscopy (FCS) vesicle binding measurements of positively charged amino acids as well as surface tyrosine residues are used to formulate a complete model of BtPI-PLC specific binding to mixed anionic phospholipid/PC membrane. DNF2, a new plant protein with homology to bacterial PI-PLC, is confirmed to be the first plant small PI-PLC enzyme that can cleave both PI and glycosylphosphatidylinositol (GPI) anchored proteins. GPI-anchored protein cleavage also confirms that DNF2 plays an important role in symbiosome, the intracellular compartment formed by the plant that contains nitrogen fixing bacteria
Thesis (PhD) — Boston College, 2015
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Agel, Eric. "Electrode à air électrolyte solide polymère alcalin pour piles à combustible et générateur métal-air". Paris 7, 2002. http://www.theses.fr/2002PA077002.
Baxani, Kamal Divesh. "Hydrogel encapsulated droplet interface bilayer networks as a chassis for artificial cells and a platform for membrane studies". Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/112707/.
JAYASINGHE, MANORI I. "HEAVY-METAL-ION TRANSPORT IN NANOPOROUS SELECTIVE-MEMBRANES: THEORY AND EXPERIMENT". University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186764159.
Aland, Sebastian, Sabine Egerer, John Lowengrub e Axel Voigt. "Diffuse interface models of locally inextensible vesicles in a viscous fluid". Elsevier, 2014. https://htw-dresden.qucosa.de/id/qucosa%3A32307.
Villar, Gabriel. "Aqueous droplet networks for functional tissue-like materials". Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:602f9161-368c-48c0-9619-7974f743f2f2.
Czarske, Jürgen, C. Leithold, Hannes Radner, Lars Büttner, Moritz Stürmer e U. Wallrabe. "Undisturbed interferometric sensing through a fluid interface by electrically-tunable lenses and micro mirrors". SPIE, 2015. https://tud.qucosa.de/id/qucosa%3A34996.
Colliat-Dangus, Perrine. "Complexation interfaciale de polymères : propriétés et stabilité d'émulsions millimétriques". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066134/document.
This work focuses on the study of an oil-water interface where the complexation of two polymers takes place. The aqueous phase is a solution of cross-linked polyacrylic acid microgels (carbomer) and the oil phase contains a polyelectrolyte possessing amine groups (amodimethicone). The stabilization of an emulsion of millimeter-sized droplets is achieved with this polymeric interface. Designed by millifluidic, the droplets are made one by one and a calibrated emulsion of oil in water is obtained. The process was developed by the company Capsum, with the objective to encapsulate perfumes or active ingredients for cosmetics. First, we characterize the adsorption and complexation of the polyelectrolytes at the oil-water interface with both static and dynamic tensiometry methods. Then, we study the mechanical properties of the polymeric membrane along with its capacity to stabilize emulsions, at the level of a collection of droplets undergoing compression which is applied either by gravity or by centrifugation, and also at the level of single droplets flowing through a glass capillary. Thanks to those various experimental methods, and depending on the physico-chemical conditions, the different emulsion stabilization regimes are highlighted. A major observation is that the amount of amodimethicone controls the anchoring of the carbomer at the interface, setting the interface state from fluid to solid, and therefore the corresponding emulsion stability. Moreover, when the membrane is solid, that is to say when the microgels are electrostatically cross-linked with the amodimethicone, a remarkable propagation of membrane rupture within an emulsion undergoing compression is revealed
Peker, Mevlut Fatih. "INVESTIGATIONS ON THE MICRO-SCALE SURFACE INTERACTIONS AT THE TOOL AND WORKPIECE INTERFACE IN MICRO-MANUFACTURING OF BIPOLAR PLATES FOR PROTON EXCHANGE MEMBRANE FUEL CELLS". VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2760.
Thoreson, Erik J. "Apparatus to deliver light to the tip-sample interface of an atomic force microscope (AFM)". Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-1003102-092130.
Keywords: purple membrane; photomechanics; photoinduced conformation change; photocycle; photoactive; photoinduced; bimetallic bending; bacteriorhodopsin; atomic force microscope; tip-sample interface; molecular conformation; PLDS; photoreactive; AFM. Includes bibliographical references (p. E-1-E-4).
Touze-Foltz, Nathalie. "Modélisation des transferts advectifs dans les étanchéités composites de centres de stockage de déchets". Paris, ENMP, 2001. http://www.theses.fr/2001ENMPA001.
COLLAZOS, STEPHANIE ORTIZ. "PHYSICAL-CHEMICAL STUDIES OF THE EFFECT OF ANTIBIOTIC INCORPORATION IN THE STRUCTURE AND MOLECULAR ORGANIZATION OF CLINICAL-GRADE LUNG SURFACTANT MONOLAYERS AND MEMBRANE MODELS AT THE AIR-WATER INTERFACE". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36895@1.
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
PROGRAMA DE DOUTORADO SANDUÍCHE NO EXTERIOR
O surfactante pulmonar é um sistema lipo-proteico que atua na interface alveolar com vital importância para manter funcional a mecânica respiratória. Os comprometimentos na sua função estão associados a diversas infecções pulmonares. Os sistemas de administração de fármacos baseados em surfactantes pulmonares derivados de animais são complexos, dificultando a compreensão do papel individual das moléculas hóspedes nas suas interações com a membrana. Aqui apresentamos uma caracterização de um extrato surfactante de pulmão porcino de grau clínico misturado com os antibióticos Levofloxacina e Claritromicina, usando uma abordagem multi-técnica – em conjunto com a metodologia de monocamadas de Langmuir– consistindo de isotermas de pressão de superfície-area, microscopia de ângulo de Brewster (BAM), espectroscopia de reflexão-absorção do infravermelho com modulação da polarização (PM-IRRAS), reflectometria de nêutrons (NR), ensaios in vitro e simulações de dinâmica molecular. Avaliou-se o efeito de ambos os antibióticos na estrutura das monocamadas de surfactantes de origem porcino bem como em monocamadas de DPPC. Foi revelado que a estabilidade / integridade das monocamadas é preservada na presença de ambas as drogas. Os sistemas mistos de antibiótico / surfactante pulmonar aumentam a atividade antibacteriana contra bactérias Gram-positivas (Bacillus cereus) e Gram-negativas (Escherichia coli). Essas descobertas fornecem novas percepções sobre a otimização de sistemas eficientes de administração de medicamentos para o tratamento de condições patológicas no nível respiratório.
The lipo-proteic surfactant system acting at the alveolar interface is of vital importance for keeping functional the respiratory mechanics. Its impairments are associated with several pulmonary infections. Drug delivery systems based on animal-derived lung surfactants are complex making it difficult to understand the individual role of guest molecules in membrane interactions. Here we present a characterization of a clinical-grade porcine lung surfactant extract mixed with the antibiotics Levofloxacin and Clarithromycin, using a multi-technique approach –in conjunction with the Langmuir-monolayer methodology– consisting of surface pressure-area isotherms, Brewster angle microscopy (BAM), polarization modulation-infrared reflection-adsorption spectroscopy (PM-IRRAS), neutron reflectometry (NR), in vitro assays, and molecular dynamics simulations. The effect of both antibiotics in the structure of porcine lung surfactant monolayers as well as in DPPC monolayers was examined. It was revealed that the stability/integrity of the monolayers is preserved in the presence of both drugs. The mixed antibiotic/lung surfactant systems enhance the antibacterial activity against Gram-positive (Bacillus cereus) and Gram-negative (Escherichia coli) bacteria. These findings provide new insights into the optimization of efficient drug delivery systems for the treatment of pathological conditions at the respiratory level.
Haelssig, Jan B. "Improving the Energy Efficiency of Ethanol Separation through Process Synthesis and Simulation". Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20100.
Bories, Florent. "Interaction entre inclusions transmembranaires transmise par la membrane cellulaire". Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCC224.
The present thesis is a study of interactions between transmembrane proteins inducing a hydrophobic mismatch with an elastic model describing the membranes at the scale of their thickness. I begin by showing that this model generalizes the precedent ones found in litterature by taking in account every possible physical constants. I add also an anchoring term at the edge of the inclusion that can induce a preferential slope. I verify that the results found with this addition is what was found previously with one inclusion in a membrane in two différent cases. Next, I develop a multipolar computation method that allows me to compute the shape of a membrane where several inclusions are presents. I give the general solutions of this model and gives an algorithm in the case where two inclusions are present in an infinite membrane. Then, I give the expected profile and the interaction energies for a typical lipidic bilayer. I compare my results to experiments performed by Constantin with an algorithm using Omstein-Zernike equation and closure relations. The first system "C12E5 + gramicidin", where the membrane is made of surfactant, gives good agreement between the theory and the experiments and allows me to give a first measurement for new physical parameters. The second system "DLPC + gramicidin" does not allow such an agreement between the theory and the experiments but I give a new lead which may give a measurement for this system
Sitte, Astrid [Verfasser], Kai [Akademischer Betreuer] Tittmann e Ulf [Akademischer Betreuer] Diederichsen. "Catalysis at the Interface- Elucidation of the Activation Process and Coupling of Catalysis and Compartmentalization of the Peripheral Membrane Protein Pyruvate Oxidase from Escherichia coli / Astrid Sitte. Gutachter: Kai Tittmann ; Ulf Diederichsen. Betreuer: Kai Tittmann". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2014. http://d-nb.info/1047237008/34.
Zhao, Hang. "Synthetic membranes in microfluidic interfaces". Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8632/.
Mulligan, J. L. "Studies of membrane transport and liquid interfaces". Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47196.
Mosadegh, Sedghi Sanaz. "Fabrication and characterization of new and highly hydrophobic hollow fiber membranes for CO₂ capture in membrane contactors". Doctoral thesis, Université Laval, 2013. http://hdl.handle.net/20.500.11794/24658.
In this work, highly hydrophobic low density polyethylene (LDPE) hollow fiber membranes aiming to be used for CO2 capture in gas-liquid membrane contactors (GLMC) were fabricated using a simple, novel method, without solvent or diluents, economic and environmentally friendly, which does not require any mechanical or thermal post-treatments. In order to produce hollow fibers and control their porosity, the process combines melt extrusion and template-leaching techniques. A mixture of LDPE and NaCl particles first produce blends with different salt contents. A microporous structure and a rough highly hydrophobic surface can then be produced by leaching the salt particles from the hollow fiber matrix via immersion in water. The new method represents a very promising alternative to conventional membrane fabrication approaches which are mainly based on phase inversion process that involves toxic and expensive solvents. The fabricated membranes were characterized in terms of morphology, density, porosity and pore size distribution, hydrophobicity, breakthrough pressure and mechanical properties. Since the phenomenon of membrane wetting by liquid absorbents is the major cause of the reduction of long-term efficiency of GLMC, a comprehensive study on the compatibility between membrane and absorbent liquid was performed. Morphological, chemical and thermal stability of LDPE membranes in contact with different aqueous alkanolamine solutions including monoethanolamine (MEA) and 2-amino-2-hydroxymethyl-1,3-propanediol (AHPD), as well as blends of MEA/PZ (piperazine) and AHPD/PZ, was investigated in detail.
Velicky, Matej. "Transfer of small molecules across membrane-mimetic interfaces". Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/transfer-of-small-molecules-across-membranemimetic-interfaces(a6abfe3c-9e0f-4fc6-bd6b-d2f8ec017c4e).html.
Pascutti, Pedro Geraldo. "Dinâmica Molecular de Peptídeos na Interface Membrana-Água". Universidade de São Paulo, 1996. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-09122013-161044/.
A software was developed for optimisation of geometry and molecular dynamics simulation, based on a parameterized classical force field. Solvent was assumed as an electrostatic continuum. The interface between the aqueous medium and the hydrophobic core of biological membranes was described by a surface of dielectric discontinuity, treated by the \"method of images\". In this method, the polarization field produced at the surface of discontinuity by a point charge was represented by a fictitious charge, placed in the opposite phase. The position and signal of this charge-image were defined by boundary conditions at the surface. Several systems were studied, either in continuous solvent, as in the presence of discontinuity surfaces: a) the population distribution of tryptophan rotamers was studied in the zwytterion and in the peptide Ala-Trp-Ala, in polar and apolar solvents; the results for the tryptophan dynamics and the rotamers populations agree with experimental observations using time resolved fluorescence and NMR spectroscopies. b) analysis of polyalanin conformations showed that the stabililty of the -helix is a cooperative effect between hydrogen bonds in low dielectric constant solvent; in the presence of the water-membrane interface, the amphyphilic -helix of a -endorphin model stabilizes on the interface; a similar behavior was observed in the signal sequence for the E. Coli -receptor, that stabilized perpendicular to the interface in a partial -helix conformation, as proposed in the literature. c) calculations on melanotropic hormone a.-MSH showed that in polar solvent it goes from helycoidal conformation to an extended one; in the presence of the interface water-membrane, the peptide goes into the interior of the membrane and stabilizes in a -turn; the stability ofthis conformation was reinforced by salt bridges between charged residues, forming a hydrophilic core surrounded by hydrophobic residues; this structural arrangement agrees with the one proposed for the biologically active conformation of the hormone. In general terms, the model proposed here for the biomembrane was able to mimic the hydrophobic, hydrophihlic or amphyphilic behavior of the peptides studied.
Norman, Robert Ellis. "Statistical mechanics of vesicles, membranes and interfaces". Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358818.
Lindström, Fredrick. "Biological membrane interfaces involved in diseases : a biophysical study". Doctoral thesis, Umeå universitet, Kemi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-806.
Lindström, Fredrick. "Biological membrane interfaces involved in diseases : a biophysical study /". Umeå : Universitetet, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-806.
Ngo, Thi Hong Giang. "Interfaces bleu de Prusse, bicouches lipidiques : vers un nouveau vecteur biomimétique". Thesis, Montpellier, 2020. http://www.biu-montpellier.fr/florabium/jsp/nnt.jsp?nnt=2020MONTT011.
In this study, we aimed to show the feasibility of the preparation of biomimetic hybrid vectors combining liposomes with a Prussian blue coating for theranostic application. The liposomes would allow us to encapsulate drugs, while the Prussian blue outer layer would provide photothermal and contrasting features to the vector. The Prussian blue deposition has first been optimized on a simple amino-gold flat surface, on which we deposited Prussian blue Analog preformed particles. Then, a new method of Prussian blue preparation has been developed, by simultaneous addition of Prussian blue precursors, to grow nanostructures directly on the flat surface model. This model was then improved by depositing a supported lipid bilayer on top of it. It made possible the growth of Prussian blue structures on a flat lipid bilayer, still by our rapid method of simultaneous addition. Then, the influence of the lipid bilayer composition was studied, as well as the interaction time between the Prussian blue precursors and the lipids. Finally, it has been showed that the deposition of Prussian blue nanostructures could also be performed on a spherical model of supported lipid bilayer, paving the way to the coating of liposomes encapsulating drugs