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1

Yiğit, Nevzat Özgü Kitiş Mehmet Çınar Özer. "Membran biyoreaktörü ile (MBR) evsel atıksu arıtımı /." Isparta : SDÜ Fen Bilimleri Enstitüsü, 2007. http://tez.sdu.edu.tr/Tezler/TF01109.pdf.

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2

Steger, Petra. "Charakterisierung Membran-permeabler basischer Peptidsequenzen." Zürich : ETH, Eidgenössische Technische Hochschule Zürich, Departement Angewandte Biowissenschaften, Institut für Pharmazeutische Wissenschaften, 2001. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=4.

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3

Schröder, Bernd. "Proteomanalyse der humanen lysosomalen Membran /." Marburg : Görich & Weiershäuser, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016450683&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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4

Näth, Oliver. "Nanoporöse Strukturen auf Nickelbasis Herstellung, Eigenschaften und Anwendungspotenzial." Göttingen Cuvillier, 2008. http://d-nb.info/991114752/04.

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5

Beyer, Andreas. "Reaktivmembranen aus Polyacrylsäure-Palladium-Verbundsystemen." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963799169.

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6

Gutlederer, Erwin Johann. "On the morphology of vesicles. - [überarb. Diss.]." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2007/1506/.

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This dissertation contains theoretical investigations on the morphology and statistical mechanics of vesicles. The shapes of homogeneous fluid vesicles and inhomogeneous vesicles with fluid and solid membrane domains are calculated. The influence of thermal fluctuations is investigated. The obtained results are valid on mesoscopic length scales and are based on a geometrical membrane model, where the vesicle membrane is described as either a static or a thermal fluctuating surface. The thesis consists of three parts. In the first part, homogeneous vesicles are considered. The focus in this part is on the thermally induced morphological transition between vesicles with prolate and oblate shape. With the help of Monte Carlo simulations, the free energy profile of these vesicles is determined. It can be shown that the shape transformation between prolate and oblate vesicles proceeds continuously and is not hampered by a free energy barrier. The second and third part deal with inhomogeneous vesicles which contain intramembrane domains. These investigations are motivated by experimental results on domain formation in single or multicomponent vesicles, where phase separation occurs and different membrane phases coexist. The resulting domains differ with regard to their membrane structure (solid, fluid). The membrane structure has a distinct effect on the form of the domain and the morphology of the vesicle. In the second part, vesicles with coexisting solid and fluid membrane domains are studied, while the third part addresses vesicles with coexisting fluid domains. The equilibrium morphology of vesicles with simple and complex domain forms, derived through minimisation of the membrane energy, is determined as a function of material parameters. The results are summarised in morphology diagrams. These diagrams show previously unknown morphological transitions between vesicles with different domain shapes. The impact of thermal fluctuations on the vesicle and the form of the domains is investigated by means of Monte Carlo simulations.
Die vorliegende Arbeit enthält theoretische Untersuchungen zur Morphologie und statistischen Mechanik von Vesikeln. Es wird die Gestalt homogener fluider Vesikel und inhomogener Vesikel mit fluiden und festen Membrandomänen berechnet. Der Einfluss thermischer Fluktuationen wird untersucht. Die erzielten Ergebnisse beziehen sich auf mesoskopische Längenskalen und basieren auf einem geometrischen Membranmodell, in welchem die Vesikelmembran als statische, beziehungsweise thermisch fluktuierende Fläche beschrieben wird. Die Arbeit besteht aus drei Teilen. Im ersten Teil werden homogene fluide Vesikel betrachtet. Das Interesse gilt dem thermisch induzierten Morphologieübergang zwischen prolaten und oblaten Vesikelformen. Mit Hilfe von Monte-Carlo-Simulationen wird ein freies Energieprofil für diese Vesikel ermittelt. Es kann gezeigt werden, dass die Formumwandlung zwischen prolaten und oblaten Formen kontinuierlich verläuft und mit keiner freien Energiebarriere verbunden ist. Der zweite und dritte Teil beschäftigt sich mit inhomogenen Vesikeln, die intramembrane Domänen enthalten. Ausgangspunkt und Motivation der Berechnungen sind experimentelle Studien über Domänbildung in ein- oder mehrkomponentigen Vesikelmembranen, bei denen Phasentrennung stattfindet und unterschiedliche Membranphasen koexistieren. Die dabei auftretenden Domänen unterscheiden sich hinsichtlich ihrer Membranstruktur (fest, fluid). Diese beeinflusst die Form der Domäne und des gesamten Vesikels auf entscheidende Weise. Im zweiten Teil werden Vesikel untersucht, bei denen feste und fluide Membrandomänen koexistieren, Teil drei widmet sich Vesikeln mit zwei koexistierenden fluiden Membranphasen. In Abhängigkeit von Materialparametern werden durch Minimierung der Membranenergie die Grundzustandsformen von Vesikeln mit einfachen und komplexen Domänenformen bestimmt. Die Ergebnisse werden in Morphologiediagrammen zusammengefasst. Dabei werden bisher unbekannte Morphologieübergänge zwischen Vesikeln mit unterschiedlichen Domänformen beobachtet. Die Auswirkungen thermischer Fluktuationen auf die Vesikel und die Form ihrer Domänen werden mittels Monte-Carlo-Simulationen untersucht.
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7

Lengerer, Wolfgang. "Sauerstoffanreicherung durch Druckwechseladsorption für Membran-Brennstoffzellensysteme /." Berlin : Logos Verl, 2008. http://deposit.d-nb.de/cgi-bin/dokserv?id=3228195&prov=M&dok%5Fvar=1&dok%5Fext=htm.

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8

Seleborg, Mikaela, Simon Taylor, Daniel Malnes, Ekwall Linnea Hedlöf, and Melhus Christoffer Parrow. "Placering av keramiska membran i Görvälnverket." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295087.

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Denna rapport behandlar membran för vattenrening tillverkade av oorganiskt icke-metalliskt material, kallade keramiska membran. Rapporten undersöker om keramiska membran kan ersätta ett eller flera reningssteg i Görvälnverket. Vattenverket ligger i Stockholms län och försörjer i dagsläget en halv miljon människor med dricksvatten.  I framtiden kommer Görvälnverket behöva bemöta utmaningar som en ökande befolkning, ökad mängd mikroorganismer och ökad mängd löst organiskt material i vattnet. Dessa utmaningar gör att vattenverket behöver uppgraderas. Ett alternativ är att ersätta  ett eller flera befintliga reningssteg med keramiska membran. För att kunna göra en bedömning av vilket steg som bör ersättas med keramiska membran har literaturstudier gjorts om membranen, Görvälnverkets nuvarande vattenberedning och ett studiebesök på verket har utförts. Studien resulterade i slutsatsen att sandfilter är det steg som är lämpligast att byta ut. Bytet skulle innebära en ökad produktion av vatten förutsatt att resterande reningssteg i kan uppnå samma produktionskapacitet.
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Dayama, Parth Omprakash. "A Comparative Study of Electrodes and Membranes for Anion Exchange Membrane Water Electrolysis Systems." Thesis, KTH, Tillämpad elektrokemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-300182.

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Vätgas kan framställas från förnybara energikällor genom vattenelektrolys med anjonbytande membran (AEMWE). AEMWE har vissa fördelar jämfört med traditionell alkalisk vattenelektrolys och elektrolysmed protonledande membran. Till exempel finns det möjlighet att använda alkalisk elektrolyt (även rent vatten) och billiga platinagruppsmetallfria katalysatorer tillsammans med ett anjonbytesmembran. Den största utmaningen med tekniken är att uppnå utmärkt och stabil prestanda för membran och elektroder. AemionTM anjonbytande membran (AEMs) av olika tjocklek, vattenupptag och kapacitet undersöktes i ett AEMWE system med 5 cm2 elektrodarea. Elektrokemisk prestanda hos dessa kommersiella AEM studerades med hjälp av porösa nickel elektroder. Bland de undersökta membranen visade AF2-HWP8-75-X stabil prestanda med en högfrekvent resistans (HFR) på 90 mΩ•cm2 och kunde nå en strömtäthet på 0,8 A/cm2 vid 2,38 V med 1 M KOH vid 60 ˚C.  AEMWE med AF2-HWP8-75-X och olika elektrodkombinationer undersöktes under samma driftsförhållanden. En elektrodkombination med Raney-Ni och NiFeO som katod respektive anod visade bäst prestanda under utvärderingen och gav en strömtäthet på 1,06 och 3,08 A/cm2 vid 2,00 respektive 2,32 V. KOH-lösningens temperatur och koncentration sänktes till 45 ˚C respektive 0,1 M för att undersöka effekten av driftsparametrar på flödescellens prestanda. Flödescellen uppvisade god stabilitet under de nya driftsförhållandena, men dess prestanda minskade avsevärt. Den nådde en strömtäthet på 0,8 A/cm2 vid 2,25 V.
Hydrogen can be produced from renewable energy sources using a novel anion exchange membrane water electrolysis (AEMWE) system. AEMWE has some benefits over the currently used state-of-the-art alkaline and proton exchange membrane water electrolysis systems. For instance, there is a possibility of using alkaline electrolytes (even pure water) and low-cost platinum-group-metal free catalysts together with an ion exchange membrane. However, the main challenge is that the AEMWE system should show excellent and stable performance, depending on the stability of the membrane and the electrodes. AemionTM anion exchange membranes (AEMs) of different thickness and water uptake capacity were investigated using a 5 cm2 AEMWE system. The electrochemical behaviour of these commercial AEMs was studied using nickel (Ni) felt electrodes. Among the investigated AEMs, the AF2-HWP8-75-X showed stable performance with a high frequency resistance (HFR) of 90 mΩ•cm2 and was able to reach a current density of 0.8 A/cm2 at 2.38 V using 1 M KOH at 60 ˚C.  AEMWE systems based on AF2-HWP8-75-X and different electrode combinations were examined under the same operating conditions. An electrode combination with Raney-Ni and NiFeO as cathode and anode, respectively, showed the best performance during the degradation test and provided a current density of 1.06 and 3.08 A/cm2 at 2.00 and 2.32 V, respectively. The operating temperature and concentration of the KOH solution were reduced to 45 ˚C and 0.1 M, respectively, to study the effect of operating parameters on the flow cell performance. The flow cell showed good stability under the new operating conditions, but its performance was reduced significantly. It reached a current density of 0.8 A/cm2 at 2.25 V.
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10

Benfer, Andreas. "Herstellung eines Adsorbers für proteingebundene Toxine durch Modifikation von PA6-Mikrofiltrationsmembranen." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=972416668.

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11

Pinnow, Henryk A. "Field theory of interacting crumpled manifolds." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=96624687X.

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12

Sezgin, Erdinc. "Continuously variable lipid packing as the principle of functional membrane heterogeneity." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-112102.

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Lipid rafts are nanoscale entities in the membranes of eukaryotic cells which provide a mechanism for the functional membrane segregation vital for several cellular processes. This lateral segregation of specific lipid and protein components provides the facilitative platforms for a variety of signaling and trafficking events at the plasma membrane and in the Golgi. Rafts are distinguished from the surrounding membranes by their physical properties and composition - they are relatively tightly packed and enriched in saturated lipids, sterols, and lipid-anchored proteins. Although the existence of rafts has been conclusively confirmed by several independent techniques, questions concerning various aspects of membrane heterogeneity are still to be addressed. Typical experiments investigating raft composition have been designed to evaluate the affinity of a given component for raft domains. In such experiments, the results are usually interpreted in a Boolean fashion, i.e., the component is either a raft molecule, or not. However, this binary point of view overlooks potential complexity that may underlie the nature of membrane heterogeneity. In this work, we systematically investigated the nature of functional cellular membrane heterogeneity. We started by characterizing the model membranes and fluorescent lipid analogs widely used in research into membrane domains. After extensively evaluating the potentials/limits of these approaches and the artifacts that must be avoided or alternatively could be exploited, we applied these tools to understand whether the cell membrane has multiple kinds of raft domains with distinct compositions and physical properties, rather than only one. We found that cell membranes have the potential to form various kinds of functional domains having different physicochemical properties, compositions, and functional outputs. Therefore, we propose continuously variable lipid packing as the principle of the functional membrane lateral heterogeneity. According to this principle, the membrane is not composed of a single variety of raft domain with strictly defined properties coexisting alongside a specific and uniform non-raft environment; rather it is composed of entities having continuously variable lipid packing. Finally, we show that this spectrum of membrane packing modulates the orientation of membrane lipid receptors, which ultimately influences their specific bioactivity. Our results showing continuously variable lipid packing and its ability to fine-tune the activity of membrane molecules comprise a novel model for the structure and function of eukaryotic membranes.
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13

Grischin, Julia [Verfasser]. "Signaltransduktion in membran-gebundenen Adenylatcyclasen / Julia Grischin." Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/1215568932/34.

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14

Tärnskär, Gustaf. "Eliminering av ePTFE membran på aktuator Arc." Thesis, Jönköping University, Tekniska Högskolan, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-50566.

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15

Bachmann, Michael. "Path integral methods in quantum statistics, quantum field theory and membrane physics." [S.l.] : [s.n.], 2001. http://www.diss.fu-berlin.de/2001/106/index.html.

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16

Pötzschke, Jörg. "Untersuchungen zur Herstellung und Charakterisierung von Kohlenstoffmembranen auf der Basis von Cellulose und Cellulosederivaten." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968460291.

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Reimann, Hendrik. "Gezielte Einstellung von Porengrössen in anorganischen Membranen." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=970193637.

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18

Gråby, Marcus, and Christian Martinsson. "Fuktegenskaper hos en funktionsfärg med termokeramisk membran-teknologi." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-26831.

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The Swedish company ThermoGaia AB has sole sales rights in the Nordic region for ThermoShield® brand, which the company markets under its own brand Termoskydd. The paint is marketed with properties such as energy savings by heat reflection and solves moisture problems because the paint can both be diffusion open or closed due to climatic conditions and function like a variable vapor barrier. These unique features come from a combination of a special binder with ceramic beads. The unique properties of the color at varying humidity conditions are in particular of interest to study and evaluate, which is also the purpose of the this study. By experimentally creating two different closed climates with differentiated relative humidity between both sides of a material, concentration differences will occur in the prevailing vapor concentrations provided that constant temperature prevails. Variations in vapor levels create pressure differences that become the driving force of the moisture transport that takes place in the form of diffusion that occurs onedimensional. The method used in the study is a modified version of the standardized cup method. Periodic measurements of weight differences continued until stationary conditions were reached. The collected measurement data is then used to calculate the water vapor migration. The result of the study shows that the color has the ability to have a lower resistance if the surrounding climate has low relative humidity, the greater the concentration difference between the vapors. When the surrounding climate instead has a high relative humidity, the color showed a higher resistance when the greatest concentration difference occurs. The study's conclusion from the problem formulation is that the causal relationship between the relative humidity and water vapor migration for the color tends to change the resistance, depending on the vapor content of ambient air, provided that stationary conditions prevail.
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Ley, Adrian. "Matrix gestützte Polymernetzwerke für die Anwendung in der konvektiven präparativen Chromatographie." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/11858/00-1735-0000-002E-E558-6.

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Erfle, Holger Erich. "Untersuchung von Membran-DNA-Komplexen in äusseren elektrischen Feldern." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=963936050.

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Seiwert, Dennis [Verfasser]. "Membran-inserierter pflanzlicher Lichtsammelkomplex LHCII : strukturelle Untersuchungen / Dennis Seiwert." Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/1166353052/34.

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Eulenberg, Claudia. "Mechanismen der bimodalen Membran-PR3-Expression auf neutrophilen Granulozyten." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16840.

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Anti-Neutrophile Cytoplasmatische Antikörper verursachen nekrotisierende Vaskulitiden kleiner Blutgefäße. Die Serinprotease PR3 ist ein ANCA-Zielantigen, welches von zirkulierenden ANCA auf der Zellmembran erkannt wird. ANCA aktivieren neutrophile Granulozyten, die dann die nekrotisierende Vaskulitis verursachen. Das Membran-PR3 Expressionsmuster ist bimodal wobei mPR3-niedrig- und mPR3-hoch-exprimierende Zellen existieren. Wir testeten die Hypothese, dass ein Membranrezeptor eine hohe mPR3-Expression vermittelt. Wir verwendeten humane neutrophile Granulozyten, neutrophil-differenzierte Stammzellen und transfizierte HEK293 Zellen. Wir identifizierten das Glykoprotein CD177 als einen mPR3-präsentierenden Rezeptor. CD177 zeigte eine spezifische Bindung von reifem PR3-Protein, nicht aber von einem unprozessierten PR3. Wir separierten die mPR3-Zellpopulationen und führten Durchflusszytometrie, Giemsa-Färbung, Western Blot-Experimente und RT-PCR für die PR3 und CD177 mRNA-Expression durch. Wir fanden, dass die mPR3hoch neutrophilen Granulozyten PR3- und CD177-Protein enthielten, während in den mPR3niedrig neutrophilen Granulozyten nur PR3, aber kein CD177 detektierbar war. Die CD177-Regulation vollzog sich auf transkriptioneller Ebene, da die Zellen, die negativ für das CD177-Protein waren auch keine mRNA transkribierten. Um die Grundlage der fehlenden CD177-Transkription zu analysieren, identifizierten wir den Transkriptionsstart von CD177 für eine anschließende Mutations- und SNP-Analyse. Die CD177-Sequenzen der proteinkodierenden Regionen und der Intron-Exon-Übergänge der beiden Zellpopulationen waren identisch. Jedoch fanden wir, dass das CD177-Gen einer monoallelischen Expression unterliegt. Es wurde dabei maternale als auch paternale monoallelische Expression detektiert. In weiterführenden Untersuchungen soll der Regulationsmechanismus der monoallelischen CD177-Expression charakterisiert werden.
Anti-Neutrophil Cytoplasmic Antibodies cause necrotizing small-vessel vasculitis. The serine protease PR3 provides a main ANCA target antigen and is recognized by circulating ANCA on the neutrophil cell surface. ANCA activate neutrophils and activated neutrophils cause vasculitis. The membrane-PR3 expression pattern is bimodal in that low and high mPR3 expressing cells can be distinguished. We tested the hypothesis that a membrane receptor mediates mPR3high expression. We studied human neutrophils, neutrophilic differentiated CD34-positive hematopoietic stem cells and transfected HEK293 cells. We identified the glycoprotein CD177 as an mPR3 presenting receptor. CD177 demonstrated specific binding of mature, but not of unprocessed pro-PR3. We separated the two mPR3 populations and performed cytometry analysis, Giemsa staining, western blot analysis and RT-PCR for PR3 and CD177 expression. We detected PR3 and CD177 protein in mPR3high expressing neutrophils, whereas only PR3, but no CD177 was found in mPR3low expressing cells. Regulation took place on a transcriptional level because cells that were negative for CD177 protein were also negative for mRNA. To further study this finding, we identified the CD177 transcription start for a subsequent mutation and SNP analysis. CD177 sequences of the protein-coding regions and the intron-exon regions did not differ in both populations. However, we found a monoallelic CD177 expression and were able to detect maternal as well as paternal allele expression. Future experiments will elucidate the mechanisms that control monoallelic CD177 gene expression.
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Borgardt, Elena Verfasser], Werner [Akademischer Betreuer] [Lehnert, and Matthias [Akademischer Betreuer] Wessling. "Mechanische Eigenschaften von katalysatorbeschichteten Membranen für die Polymer-Elektrolyt-Membran Elektrolyse / Elena Borgardt ; Werner Lehnert, Matthias Wessling." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://nbn-resolving.de/urn:nbn:de:101:1-2021061004375586389827.

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Weh, Barbara. "Permeationseigenschaften von Polydimethylsiloxan-Membranen in Abhängigkeit von der Netzbogenlänge." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966041755.

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Artuğ, Gamze. "Modelling and simulation of nanofiltration membranes." Göttingen Cuvillier, 2007. http://d-nb.info/986774685/04.

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Schmittmann, Georg. "Bioabbaubare Mikropartikel : In vitro Simulation parenteraler IM-Applikationen und Untersuchungen zur Stabilisierung von NGF /." Marburg : Görich & Weiershäuser, 2000. http://www.gbv.de/dms/bs/toc/319704513.pdf.

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Striebinger, Hannah. "Membran-assoziierte Protein-Protein-Interaktionen des Herpes simplex-Virus 1." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-146882.

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Pastillé, Holger. "Über die Nichtlinearitäten am Kondensatormikrofon unter besonderer Berücksichtigung der Membran." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96284487X.

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Berlin, Techn. Univ., Diss., 2001.
Dateiformat: zip, Dateien in unterschiedlichen Formaten. - Vollst. Arbeit via: pastille.holger.pdf (Acrobat-Icon fast zuunterst in el. Dok.liste). Computerdatei im Fernzugriff.
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Meindl, Nadja Melanie. "Das Importomer in der peroxisomalen Membran der Hefe Saccharomyces cerevisiae." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968681336.

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Hummel, Claudius. "Charakterisierung einer Membran-Gassensor-Kombination zum Nachweis von gelösten Gasen." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962761087.

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Letzkus, Florian. "Membran- und Struktur-Ätzprozesse für grossflächige Projektionsmasken in der Nanolithografie /." [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10767933.

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Ackermann, Stefan [Verfasser]. "Zuverlässigkeitsuntersuchungen und Vergleich von AEM-Membran-Elektroden-Einheiten / Stefan Ackermann." Halle, 2018. http://d-nb.info/1175950521/34.

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Hoffmann, Florian [Verfasser]. "Membran-Elektroden-Einheiten für Polymermembran-Brennstoffzellen in Mikrosystemtechnik / Florian Hoffmann." München : Verlag Dr. Hut, 2014. http://d-nb.info/106322134X/34.

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Wicki, Andreas Niklaus. "The membran glycoprotein Ib, complex from the human blood platelets /." [S.l : s.n.], 1986. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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Letzkus, Florian. "Membran- und Struktur-Ätzprozesse für großflächige Projektionsmasken in der Nanolithografie." [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10790755.

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Kaz, Till. "Herstellung und Charakterisierung von Membran-Elektroden-Einheiten für Niedertemperatur Brennstoffzellen." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-38201.

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Bergström, Johan. "Utveckling av en experimentell uppställning för studie av massöverföring genom membran." Thesis, KTH, Skolan för kemivetenskap (CHE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170632.

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The primary goal of this project is to develop an experimental setup for testing membrane materials. The membranes tested are all porous, hydrophilic and non- selective. The secondary goal is that the module finds use as an educational tool for learning about diffusion on a university level. The final setup consisted of two modified 250 ml polyethylene bottles with a wide neck joined together with a flange pinning the test object in between. In the experiments one side is loaded with a sodium chloride solution, while the other is loaded with pure deionized water. The conductivity change is then monitored in the chamber loaded with deionized water using a conductivity probe. Two test subjects are tested, an alpha Cellulose filter and a polycarbonate membrane. The mass transfer coefficient are determined to be 8.99*10-6 ± 3.90*10-6 [cm/min] and 3.62*10-5 ± 1.49*10-6 [cm/min] respectively. The large inconsistencies in the alpha cellulose filters results in large standard deviations, whereas the polycarbonate is very consistent and therefore have very small error bars. Meaning that the largest error in this design originates from inconsistencies between samples of the test subject. The setup is suitable as an educational tool due to short run times of one hour, the generated data only requires simple linear regression to extract mass transfer coefficients from the slope. The experiment can be varied further by adjusting temperature and stirring.
Det primära målet med det här projektet är att utveckla en experimentell uppställning för att testa membran. Alla testade membran är porösa, hydrofila och icke-selektiva. Det sekundära målet är att uppställningen kan användas som ett pedagogiskt verktyg för kurser i masstransport. Den slutliga uppställningen består av två modifierade 250 ml polyeten flaskor med vid hals, ihopsatta med en fläns som håller testobjektet på plats emellan flaskorna. I experimenten fylls en av kamrarna med saltlösning och den andra med avjoniserat vatten, konduktiviteten mäts i kammaren som laddas med avjoniserat vatten. Två objekt testades, ett alfacellulosa filter och ett polykarbonat membran. Massöverförings koefficienter bestämdes till 8.99*10-6 ± 3.90*10-6 [cm/min] för alfacellulosa filtret och 3.62*10-5 ± 1.49*10-6 [cm/min] för polykarbonat membranet. Det finns stora variationer i alfacellulosa materialet vilket leder till stora standardavvikelse i körningarna på alfacellulosa filtret, medan polykarbonat membranen var identiska och därmed har väldigt små felstaplar. Därmed kunde det fastslås att stora avvikelser nästan bara beror på variationer i testobjektet. Uppställningen lämpar sig för undervisning eftersom körningstiden är kort (1 timme) och massöverföringskoefficienten kan tas fram med linjär regression. Experimentet kan bland annat varieras genom att ändra temperatur och omrörning.
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38

Siegel, Frank. "Tiefdruckverfahren zur Herstellung von Katalysatorschichten für (PEM) Brennstoffzellen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-203816.

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Diese Dissertation befasst sich mit der industrienahen Herstellung von Katalysatorschichten für Polymer-Elektrolyt-Membran-Brennstoffzellen mit Hilfe des Tiefdrucks als Fertigungsverfahren. Um die Anforderungen an die Katalysatorschicht hinsichtlich der Schichtdicke zu erreichen, wird ein Linienraster für den Tiefdruck entwickelt. Das patentierte und verifizierte Designkonzept des Linienrasters ermöglicht es, trotz Tinten mit geringem Feststoffgehalt hohe Trockenschichtdicken zu erzeugen. Aufgrund des verwendeten Tiefdruckrasters sind Optimierungsschritte an der Fertigungsanlage notwendig, um eine hohe Schichtqualität zu erreichen. Schließlich werden kontinuierlich und industrienah Katalysatorschichten gefertigt, die als Membran-Elektroden-Einheit in einer Polymer-Elektrolyt-Membran-Brennstoffzelle erfolgreich eingesetzt werden
This work presents an industrial close manufacturing process of active electrodes for Polymer Electrolyte Fuel Cells utilizing an adapted gravure printing process. To meet the requirements of the electrodes regarding the layer thickness (weight) and quality a novel line screen with maximized dipping volume for gravure printing was developed and investigated. A design rule for this kind of screens was realized and verified by a successful manufacturing of electrodes with different dried layer thicknesses. Due to the rough structure and the high dipping volumes of these line screens an adaption and optimization of the machinery and the whole process was necessary to achieve high quality electrodes. Finally, it is shown that it is possible to manufacture continuiously in an industrial close roll-to-roll process platinum loaded electrodes, working successful as cathode in a Membran-Electrode-Assembly
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39

Dannehl, Claudia. "Fragments of the human antimicrobial LL-37 and their interaction with model membranes." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2013/6814/.

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A detailed description of the characteristics of antimicrobial peptides (AMPs) is highly demanded, since the resistance against traditional antibiotics is an emerging problem in medicine. They are part of the innate immune system in every organism, and they are very efficient in the protection against bacteria, viruses, fungi and even cancer cells. Their advantage is that their target is the cell membrane, in contrast to antibiotics which disturb the metabolism of the respective cell type. This allows AMPs to be more active and faster. The lack of an efficient therapy for some cancer types and the evolvement of resistance against existing antitumor agents make AMPs promising in cancer therapy besides being an alternative to traditional antibiotics. The aim of this work was the physical-chemical characterization of two fragments of LL-37, a human antimicrobial peptide from the cathelicidin family. The fragments LL-32 and LL-20 exhibited contrary behavior in biological experiments concerning their activity against bacterial cells, human cells and human cancer cells. LL-32 had even a higher activity than LL-37, while LL-20 had almost no effect. The interaction of the two fragments with model membranes was systematically studied in this work to understand their mode of action. Planar lipid films were mainly applied as model systems in combination with IR-spectroscopy and X-ray scattering methods. Circular Dichroism spectroscopy in bulk systems completed the results. In the first approach, the structure of the peptides was determined in aqueous solution and compared to the structure of the peptides at the air/water interface. In bulk, both peptides are in an unstructured conformation. Adsorbed and confined to at the air-water interface, the peptides differ drastically in their surface activity as well as in the secondary structure. While LL-32 transforms into an α-helix lying flat at the water surface, LL-20 stays partly unstructured. This is in good agreement with the high antimicrobial activity of LL-32. In the second approach, experiments with lipid monolayers as biomimetic models for the cell membrane were performed. It could be shown that the peptides fluidize condensed monolayers of negatively charged DPPG which can be related to the thinning of a bacterial cell membrane. An interaction of the peptides with zwitterionic PCs, as models for mammalian cells, was not clearly observed, even though LL-32 is haemolytic. In the third approach, the lipid monolayers were more adapted to the composition of human erythrocyte membranes by incorporating sphingomyelin (SM) into the PC monolayers. Physical-chemical properties of the lipid films were determined and the influence of the peptides on them was studied. It could be shown that the interaction of the more active LL-32 is strongly increased for heterogeneous lipid films containing both gel and fluid phases, while the interaction of LL-20 with the monolayers was unaffected. The results indicate an interaction of LL-32 with the membrane in a detergent-like way. Additionally, the modelling of the peptide interaction with cancer cells was performed by incorporating some negatively charged lipids into the PC/SM monolayers, but the increased charge had no effect on the interaction of LL-32. It was concluded, that the high anti-cancer activity of the peptide originates from the changed fluidity of cell membrane rather than from the increased surface charge. Furthermore, similarities to the physical-chemical properties of melittin, an AMP from the bee venom, were demonstrated.
Aufgrund der steigenden Resistenzen von Zellstämmen gegen traditionelle Therapeutika sind alternative medizinische Behandlungsmöglichkeiten für bakterielle Infektionen und Krebs stark gefragt. Antimikrobielle Peptide (AMPs) sind Bestandteil der unspezifischen Immunabwehr und kommen in jedem Organismus vor. AMPs lagern sich von außen an die Zellmembran an und zerstören ihre Integrität. Das macht sie effizient und vor allem schnell in der Wirkung gegen Bakterien, Viren, Pilzen und sogar Krebszellen. Das Ziel dieser Arbeit lag in der physikalisch-chemischen Charakterisierung zweier Peptidfragmente die unterschiedliche biologische Aktivität aufweisen. Die Peptide LL-32 und LL-20 waren Teile des humanen LL-37 aus der Kathelizidin-Familie. LL-32 wies eine stärke Aktivität als das Mutterpeptid auf, während LL-20 kaum aktiv gegen die verschiedenen Zelltypen war. In dieser Arbeit wurde die Wechselwirkung der Peptide mit Zellmembranen systematisch anhand von zweidimensionalen Modellmembranen in dieser Arbeit untersucht. Dafür wurden Filmwaagenmessungen mit IR-spektroskopischen und Röntgenstreumethoden gekoppelt. Circulardichroismus-Spektroskopie im Volumen komplementierte die Ergebnisse. In der ersten Näherung wurde die Struktur der Peptide in Lösung mit der Struktur an der Wasser/Luft-Grenzfläche verglichen. In wässriger Lösung sind beide Peptidfragmente unstrukturiert, nehmen jedoch eine α-helikale Sekundärstruktur an, wenn sie an die Wasser/Luft-Grenzfläche adsorbiert sind. Das biologisch unwirksamere LL-20 bleibt dabei teilweise ungeordnet. Das steht im Zusammenhang mit einer geringeren Grenzflächenaktivität des Peptids. In der Zweiten Näherung wurden Versuche mit Lipidmonoschichten als biomimetisches Modell für die Wechselwirkung mit der Zellmembran durchgeführt. Es konnte gezeigt werden, dass sich die Peptide fluidisierend auf negativ geladene Dipalmitylphosphatidylglycerol (DPPG) Monoschichten auswirken, was einer Membranverdünnung an Bakterienzellen entspricht. Eine Interaktion der Peptide mit zwitterionischem Phosphatidylcholin (PC), das als Modell für Säugetierzellen verwendet wurde, konnte nicht klar beobachtet werden, obwohl biologische Experimente das hämolytische Verhalten zumindest von LL-32 zeigten. In der dritten Näherung wurde das Membranmodell näher an die Membran von humanen Erythrozyten angepasst, indem gemischte Monoschichten aus Sphingomyelin (SM) und PC hergestellt wurden. Die physikalisch-chemischen Eigenschaften der Lipidfilme wurden zunächst ausgearbeitet und anschließend der Einfluss der Peptide untersucht. Es konnte anhand verschiedener Versuche gezeigt werden, dass die Wechselwirkung von LL-32 mit der Modellmembran verstärkt ist, wenn eine Koexistenz von fluiden und Gelphasen auftritt. Zusätzlich wurde die Wechselwirkung der Peptide mit der Membran von Krebszellen imitiert, indem ein geringer Anteil negativ geladener Lipide in die Monoschicht eingebaut wurde. Das hatte allerdings keinen nachweislichen Effekt, so dass geschlussfolgert werden konnte, dass die hohe Aktivität von LL-32 gegen Krebszellen ihren Grund in der veränderten Fluidität der Membran hat und nicht in der veränderten Oberflächenladung. Darüber hinaus wurden Ähnlichkeiten zu Melittin, einem AMP aus dem Bienengift, dargelegt. Die Ergebnisse dieser Arbeit sprechen für einen Detergenzien-artigen Wirkmechanismus des Peptids LL-32 an der Zellmembran.
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40

Pelzer, Katrin. "Ruthenium nanoparticles synthesis, characterisation and organisation in aluminia membranes and mesoporous materials ; applications in catalysis /." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=971183279.

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41

Mayerhofer, Peter Uli. "Functional characterization of the human peroxins PEX3 and PEX19, proteins essential for early peroxisomal membrane biogenesis." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969361378.

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42

Ballhause, Dirk. "Diskrete Modellierung des Verformungs- und Versagensverhaltens von Gewebemembranen." Stuttgart : Inst. für Statik und Dynamik der Luft- und Raumfahrtkonstruktionen, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016174166&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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43

Trautmann, Helmut. "Stofftransport durch pharmazeutisch relevante Membranen /." [S.l. : s.n.], 1990. http://www.gbv.de/dms/bs/toc/016009584.pdf.

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44

Marković, Ana. "Experimental and theoretical analysis of the mass transport through porous glass membranes with different pore diameters." Magdeburg docupoint-Verl, 2009. http://d-nb.info/1000102246/04.

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45

Riek, Esther. "Langzeiterfolg von Implantaten in regeneriertem Knochen bei Patienten mit generalisierter aggressiver Parodontitis : eine prospektive Fall-Kontrollstudie /." Marburg : Görich und Weiershäuser, 2004. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=012974881&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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46

Zou, Yang. "Modelluntersuchungen zu Protonenschwamm-Membranen für Brennstoffzellen." [S.l. : s.n.], 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9818579.

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47

Eyrich, Beate [Verfasser], Albert [Akademischer Betreuer] Sickmann, and Oliver [Gutachter] Kayser. "Massenspektrometrische Charakterisierung von Phosphorylierungsstellen in mitochondrialen Membranen und Membran/Protein-Komplexen / Beate Eyrich. Betreuer: Albert Sickmann. Gutachter: Oliver Kayser." Dortmund : Universitätsbibliothek Dortmund, 2015. http://d-nb.info/1112561366/34.

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48

Schwinde, Jan-Hendrik [Verfasser], Gerd [Gutachter] Geerling, and Lars [Gutachter] Wojtecki. "Langzeitergebnisse nach Descemet-Membran Endothel Kerato-plastik (DMEK) und Triple-Descemet-Membran Endothel Keratoplastik (Triple-DMEK) im Vergleich / Jan-Hendrik Schwinde ; Gutachter: Gerd Geerling, Lars Wojtecki." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2019. http://d-nb.info/1188017888/34.

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49

Rane, Mahendra. "Porous Membrane." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000336.

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Membrane processes can cover a wide range of separation problems [with a specific membrane (membrane structure) required for every problem]. Thus, there are membranes available that differ in their structure and consequently in the functionality. Therefore membrane characterization is necessary to ascertain, which membrane may be used for a certain separation. Membranes of pore size ranging from 100nm to 1μm with a uniform pore size are very important in membrane technology. An optimum performance is achieved when the membrane is as thin as possible having a uniform pore size. Here in this thesis, membranes were synthesized by particle assisted wetting using mono-layers of silica colloids as templates for pores along with polymerizable organic liquids on water surface. The pore size reflects the original shape of the particles. Thus it is possible to tune the pore size by varying the particle size. This method is effective to control pore sizes of membranes by choosing silica particles of suitable size. This approach gives a porous structure that is very thin, but unfortunately limited in mechanical stability. Thus there is a need for support which is robust and can withstand the various mechanical stresses. A small change in the membrane or defect in the layered structure during the membrane formation can have drastic effect on the assembly. Lateral homogeneity of the layer generated by the particle assisted wetting can be judged by examination of its reflectivity, but once it is transferred on any solid support this option is no more. So a method is needed to detect the cracks or the inhomogenity of the membrane which can be detected even after the transfer. To tackle this problem a very simple and novel technique for characterizing the membrane by fluorescence labeling and optical inspection was developed in this thesis. The idea was to add a fluorescent dye which is poorly water soluble to the spreading solution comprising of the particles and the monomer. If the dye survived the photo-cross linking, then it would be embedded in the cross-linked polymer and would serve as a marker. Defects and inhomogenity would show up as cracks and spots. By the method that we have developed, we can detect our membrane from the support and spot defects.
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50

Thornton, Nicolas [Verfasser], and Nikolaus [Akademischer Betreuer] Pfanner. "Eine modulare Assemblierungsmaschinerie für die Biogenese der äußeren Membran von Mitochondrien." Freiburg : Universität, 2012. http://d-nb.info/112347298X/34.

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