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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Weber, Malte; Geu Flores, Francisco; Raab, Dominik; Hefter, Harald; +4 Authors

    Motiviert durch ein Anwendungsbeispiel wird die Komfortzone für mobile, kinematisch redundante Manipulatoren definiert. Die Lage und Orientierung der Basis des Manipulators und die Gelenkwinkel werden so gewählt, dass ausgesuchte Zielfunktionen minimal werden. Diese Zielfunktionen werden aus bekannten Maßen wie kartesische Geschwindigkeit, Kraft und Steifigkeit abgeleitet. Sie werden abhängig von den Parametern der Basis und den Gelenkwinkeln des Manipulators bestimmt, wobei nur ein Unterraum an möglichen Konfigurationen aufgrund der vorgegebenen Lage und Orientierung des Endeffektors (EE) für die Optimierung frei wählbar ist. Es werden im Sinne der multikriteriellen Optimierung Pareto-Fronten errechnet, welche durch vordefinierte Grenzen (z.B. minimale erreichbare Kraft oder minimale erreichbare Geschwindigkeit) begrenzt werden. Motivated by an application example, the comfort zone for mobile kinematically redundant manipulators is defined. The position and orientation of the mobile platform (=base of the manipulator) and the joint angles are selected in such a way that selected target functions are minimized. These objective functions are derived from known measures such as Cartesian velocity, force and stiffness. The objective functions are evaluated depending on the parameters of the base and the joint angles of the manipulator, whereby only a subspace of possible configurations is freely selectable for optimization due to the given position and orientation of the end effector (EE). Pareto-fronts are calculated in the sense of multi-criteria optimization, which are limited by, e.g., minimum achievable force or minimum achievable speed. IFToMM D-A-CH Konferenz, vol. 2020Sechste IFToMM D-A-CH Konferenz 2020: 27./28. Februar 2020, Campus Technik Lienz

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Rieckmann, Marco;

    With the programme “Subject-related Partnerships with Universities in Developing Countries” the German Academic Exchange Service (DAAD) supports German universities in structure-building cooperation projects with partners in countries of the South. The German-foreign cooperation aims at giving both sides new impulses in teaching and the formation of new structures at the foreign university. Since 2009 the Institute for Environmental and Sustainability Communication at the Leuphana University of Lüneburg has implemented partnership projects with universities in Ecuador and Peru sponsored by the DAAD. The scientific evaluation of the project “Teaching and Learning Sustainability” with the Universidad Técnica del Norte (UTN), Ecuador, shows that the project contributes to the integration of the concept of sustainable development in teaching, research and administration at the UTN and that it opens opportunities for global learning for all participants. However, also challenges of North-South cooperation in higher education become apparent. (DIPF/Orig.) Mit dem Förderprogramm „Fachbezogene Partnerschaften mit Hochschulen in Entwicklungsländern“ unterstützt der Deutsche Akademische Austauschdienst (DAAD) deutsche Hochschulen bei strukturbildenden Kooperationsvorhaben mit Partnern in Ländern des Südens. Die deutsch-ausländische Kooperation soll beiden Seiten neue Impulse in der Lehre geben und zur Bildung von neuen Strukturen an der ausländischen Hochschule beitragen. Das Institut für Umweltkommunikation der Leuphana Universität Lüneburg unterhält seit 2009 vom DAAD geförderte Partnerschaftsprojekte mit Hochschulen in Ecuador und Peru. Die wissenschaftliche Begleitung des Projekts „Nachhaltigkeit lehren und lernen“ mit der Universidad Técnica del Norte (UTN), Ecuador, zeigt, dass es an der UTN zur Integration des Leitbilds einer nachhaltigen Entwicklung in Lehre, Forschung und Verwaltung beiträgt und für alle Beteiligten Möglichkeiten des Globalen Lernens eröffnet. Es werden aber auch Herausforderungen der Nord-Süd-Hochschulkooperation deutlich. (DIPF/Orig.) ZEP : Zeitschrift für internationale Bildungsforschung und Entwicklungspädagogik 34 (2011) 2, S. 10-16

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Fachlicher Dokumente...arrow_drop_down
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    Authors: Zou, Yang;

    In polymer electrolyte fuel cells (PEFC), hydrated perfluorosulfonate ionomers such as NAFION are generally used as membrane materials. The high proton conductivity required for the application in the fuel cells comes from the water which acts as a carrier for protons in the swollen polymer membrane. A main disadvantage of such hydrated materials is that the upper limit of their useful temperature range is 100°C at normal pressure. However, when reformates or methanol is used as a fuel in fuel cells, temperatures above 100°C are required. Therefore, the development of new polymer electrolyte membrane materials for the application at high temperature, e.g. in the direct methanol fuel cell (DMFC), is attracting considerable interest. It has already been reported that heterocyclic aromates, such as imidazole, pyrazole and benzimidazole, show proton and solvent transport properties similar to water at a given temperature related to the corresponding melting point. However, due to their relatively low vapor pressures, these low molecular weight components will volatilize progressively as increasing temperature, which leads to a decrease of conductivity. One approach to overcome this limitation is to fix the proton carrier on the polymer backbone. 1,8-bis(dimethylamino)naphthalene has been selected as a carrier because of its well known proton sponge characteristics. Using this compound as carrier moiety in the side chain or main chain the different novel polymers were synthesized in this work. All synthesized polymers were characterized by different methods. Using proton sponge and functional polymers as base components, while p-toluene sulfonic acid and sulfonated polystyrene as acid components, both low molecular weight mixture and blends were prepared and inverstigated regarding their proton transfer, morphology and conductivity by FTIR, DSC and impedance spectroscopy. Im Bereich der Niedertemperatur-Brennstoffzellen kommt den protonenleitenden Membranmaterialien eine entscheidende Rolle zu. In kommerziellen Polymerelektrolyt-Brennstoffzellen (PEMC) werden gewöhnlich perfluorierte Sulfonationionomere wie z. B. Nafion als Membranmaterial eingesetzt. Ein Hauptnachteil dieser Materialien ist allerdings die begrenzte Temperaturstabilität der Membran. Oberhalb von 80°C verarmt die Membran an Wasser einhergehend mit dem Verlust an Protonenleitfähigkeit. Die Verwendung von z. B. Methanol anstelle von Wasserstoff als Brennstoff (DMFC) erfordert jedoch Temperaturen über 150°C. Die in der Literatur bekannten Ansätze Wasser als Protonencarrier zu ersetzen, basieren auf der Verwendung höhersiedender Heteroaromaten wie z.B. Imidazol, Pyrazol und Benzimidazol. Eine Verflüchtigung dieser Stoffe bei höherer Temperatur führt aber auch hier zur Verarmung an Ladungsträgereinheiten in der Membran. Ein Ansatz diese Limitierung zu umgehen, ist die Verwendung von festen Carriermembranen, bei denen die Carrierfunktion von funktionellen, am Polymer fixierten Strukturelementen übernommen wird. Im Rahmen dieser Arbeit wurden Funktionspolymere mit 1,8-Bis(dimethylamino)naphthalin- Struktureinheiten, die in der Literatur als "Protonenschwammverbindung" bekannt sind, sowohl in die Hauptkette als auch in die Seitenkette synthetisiert. Diese Funktionspolymere wurden mittels verschiedener Analytikmethoden charakterisiert. Die Mischungen des als Poylmerstrukturbaustein fungierenden 1,8-Bis(dimethylamino)-naphthalins mit p-Toluolsulfonsäure wie auch die Ionomerblends aus Funktionspolymer bzw. sulfonierten Polystyrol und niedermolekularen Komponenten wurden hergestellt und hinsichtlich ihrer Protonentransfer, Morphologie und Leitfähigkeit mittels FTIR-Spektroskopie, differentieller Wärmeflußkalorimetrie und Impedanzspektroskopie untersucht.

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    https://dx.doi.org/10.18419/op...
    Doctoral thesis . 2002
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      Doctoral thesis . 2002
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    Authors: Holzhauer, Sascha; Krebs, Friedrich; Fischer, Timo; Mackensen, Reinhard;

    Dieser Bericht fasst die Ergebnisse der Sichtung und Bewertung existierender Beschreibungen und Architekturen des Systems Energie/IKT sowie Vorschläge zu nötigen Erweiterungen gemäß Task 3.1 „Architekturmodelle des Energiesystems“ und zu bestehenden und zukünftigen Datenflüssen gemäß Task 3.2. „Kommunikationsarchitekturen“ zusammen. Dazu werden zunächst eine Beschreibung sowie eine Analyse der relevanten Architekturbestandteile und der beteiligten Rollen und Akteure durchgeführt. Darauf aufbauend wird dann ein Überblick existierender Anwendungsfälle von IKT im Kontext Smart Grid gegeben und exemplarisch einzelne Fälle detaillierter analysiert. The research presented in this article was partly funded by the German Ministry for Education and Research (BMBF) under contract no "03SFK4F1".

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      ZENODO
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    Authors: Spangenberger, Pia; Draeger, Iken; Kapp, Felix; Matthes, Nadine; +3 Authors

    Im Kartenset zum digitalen Spiel "Serena Supergreen und der abgebrochene Flügel" finden sich allgemeine Informationen zum Spiel und zur Anwendung im Unterricht. Das Kartenset umfasst Vertiefungsvorschläge für den Unterricht, Berufsbilder und Experimente. The card set for the digital game "Serena Supergreen and the Broken Wing" contains general information about the game and instructions for teachers. The card set includes didactical conepts, job descriptions and experiments.

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    https://dx.doi.org/10.14279/de...
    Report . 2019
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      https://dx.doi.org/10.14279/de...
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    Authors: Hemmer, Ingrid; Döpke, Marie; Koch, Christoph; Peitz, Anna;

    Para implantar la EDS en los planes de estudios de las instituciones de enseñanza superior es indispensable impartir formación en EDS a los profesores universitarios. Basándose en modelos de competencias, el artículo presenta el concepto de dicha formación y describe, explica y discute los resultados del examen empírico de su eficacia. Se pone de manifiesto que la formación de los participantes en el ámbito de los conocimientos profesionales, especialmente en los conocimientos conceptuales, logró incrementos significativos. Se observó un aumento en las facetas no cognitivas, pero sólo resultó significativo en los ítems individuales. Zur Implementierung von BNE in die Curricula der Hochschulen sind hochschuldidaktische BNE-Fortbildungen unabdingbar. Dieser Beitrag stellt ausgehend von Kompetenzmodellen die Konzeption einer solchen Fortbildung vor und beschreibt, erläutert und diskutiert Ergebnisse der empirischen Überprüfung ihrer Wirksamkeit. Dabei wird deutlich, dass die Fortbildung bei den Teilnehmerinnen und Teilnehmern im Bereich Professionswissen, insbesondere beim Konzeptwissen, signifikante Erhöhungen erzielte. Auch bei den nicht-kognitiven Facetten ließen sich höhere Werte beobachten, die sich jedoch nur bei einzelnen Items als signifikant erwies. In order to implement ESD in the curricula of higher education institutions, ESD training for university lecturers is indispensable. Based on competency models, this article introduces an exemplary training and describes, explains, and discusses the results of the empirical review of its effectiveness. The results show that the training of the participants in the field of professional knowledge, especially in concept knowledge, achieved significant increase. Non-cognitive facets also experienced an increase; however, this only proved to be significant for individual items.

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    https://dx.doi.org/10.18452/26...
    Article . 2023
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      https://dx.doi.org/10.18452/26...
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    Authors: Barth, Matthias; Fischer, Daniel; Rode, Horst;

    Der Beitrag stellt den partizipativen Ansatz des Projektes „Bildungsinstitutionen und nachhaltiger Konsum“ (BINK) zur Entwicklung von Maßnahmen vor, die nachhaltigen Konsum bei Jugendlichen und jungen Erwachsenen in Bildungseinrichtungen fördern. Im Zentrum stehen dabei die Fragen, wie sich Konsumpräferenzen im Zusammenhang mit nachhaltiger Entwicklung und globaler Gerechtigkeit bei jungen Menschen ausprägen und inwiefern sich diese durch die Teilnahme an dem partizipativen BINK-Projekt verändern. Zur Beantwortung dieser Fragen werden Ergebnisse aus begleitenden empirischen Untersuchungen dargestellt. (DIPF/Orig.) The paper presents the participatory approach of the project “Educational Institutions and Sustainable Consumption” (BINK), which aims at developing measures of interventions to promote sustainable consumption among youths and young adults in educational organisations. It focuses on the analysis of student consumption orientations in the context of sustainable development and global justice and on how these can be changed through participation in BINK project activities. Results from an accompanying empirical study are presented to further investigate these questions raised. (DIPF/Orig.) ZEP : Zeitschrift für internationale Bildungsforschung und Entwicklungspädagogik 34 (2011) 4, S. 20-26

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    Authors: Reinfried, Sibylle; Künzle, Roland; Felder, Susanne;

    Changes in the global climate are widely discussed in science and society. The question therefore arises as to whether and how climate change is being discussed in periodicals aimed specifically at subject specific education. This paper traces the perception of climate change in these journals as part of an explorative descriptive analysis. Subject of the study were the articles on climate change, climate protection, and climate policy which were published in the period from 2006 to 2016 in eleven German-language journals related to the teaching of Geography, Biology, Chemistry, Physics, and Social Studies at the secondary level. The content analysis of the articles was carried out by means of a previously developed category system whose content and structure is based on the thematic structure of the IPPC reports. In total, 149 articles were identified. Of these, more than 64 per cent were journals relating to Geography. The number of publications varies greatly from year to year. In the years 2009 and 2015, a particularly large number of articles were published, accounting for a total of 44 per cent of the publications covered. Thematically, the publications focused on past and future changes in the climate system and their consequences. In relation to this less well represented were the topics of climate protection and climate policy, such as measures for sustainable development, avoidance of emissions and adaptation to climate change, as well as climate policy conflicts of goals and potential synergies. These findings are significant for future development work aimed at achieving climate literacy. Die Veränderungen des globalen Klimas werden in Wissenschaft und Gesellschaft breit diskutiert. Es stellt sich daher die Frage, ob und wie der Klimawandel in Zeitschriften für die Unterrichtspraxis rezipiert wird. In diesem Beitrag wird im Rahmen einer explorativen deskriptiven Analyse die Rezeption des Klimawandels in diesen Zeitschriften nachgezeichnet. Gegenstand der Untersuchung sind die Artikel, die im Zeitraum von 2006 bis 2016 in elf deutschsprachigen fachdidaktisch orientierten Zeitschriften für die Unterrichtsfächer Geographie, Biologie, Chemie, Physik und Gemeinschaftskunde zum Klimawandel und Klimaschutz/Klimapolitik publiziert wurden. Die inhaltliche Analyse der Beiträge erfolgte mittels eines zuvor entwickelten Kategoriensystems, dessen Inhalte und Aufbau sich an der thematischen Struktur der IPPC-Berichte orientiert. Gesamthaft konnten 149 Beiträge identifiziert werden. Davon stammen ca. 64% aus geographischen Unterrichtszeitschriften. Die Anzahl der Beiträge variiert stark von Jahr zu Jahr. In den Jahren 2009 und 2015 wurden besonders viele Beiträge publiziert, die zusammen 44% der erfassten Publikationen ausmachen. Thematisch liegt der Schwerpunkt der Beiträge auf den bisherigen und künftigen Änderungen des Klimasystems und den damit verbundenen Folgen. Im Verhältnis dazu sind Klimaschutz und Klimapolitik mit Maßnahmen zur nachhaltigen Entwicklung, Vermeidung von Emissionen und Anpassung an den Klimawandel sowie klimapolitische Zielkonflikte und Synergien geringer vertreten. Diese Erkenntnisse sind für zukünftige Entwicklungsarbeiten, deren Ziel die climate literacy ist, bedeutsam.

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    https://dx.doi.org/10.18452/22...
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      https://dx.doi.org/10.18452/22...
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    Authors: Oehmke, Sebastian;

    Da fossile Quellen endlich sind, werden Chemikalien aus nachwachsenden Rohstoffen immer interessanter für die Forschung und Industrie. Zu den vielversprechenden Plattformchemikalien gehört das Stoffpaar 3-Hydroxypropionaldehyd/ Acrolein. Jedoch sind bisherige Ansätze für eine wirtschaftliche Produktion von 3-Hydroxypropionaldehyd/ Acrolein im industriellen Maßstab nicht ausreichend. Deshalb wurde in dieser Arbeit geprüft, inwieweit sich Schlempe, ein glycerinhaltiges Nebenprodukt der Bioethanolherstellung, zur 3-Hydroxypropionaldehyd/ Acrolein Produktion nutzen lässt und inwieweit diese Produktion in den Bioethanolprozess im Sinne des Bioraffineriekonzeptes integriert werden kann, um bestehende Probleme zu lösen und Produktionskosten zu reduzieren. Dazu wurden ansatzweise und kontinuierliche Versuche im 5 ml bis 2 l Maßstab sowie Berechnungen in den Bereichen Biokatalysatorproduktion, Biotransformation, Aufreinigung und Kostenschätzung durchgeführt. Der Ganzzellbiokatalysator Lactobacillus reuteri ATCC 53608 ist nicht in der Lage die Hefezellen aus Bioethanolproduktionsrückständen für sein Wachstum zu nutzen, jedoch hat sich gezeigt, dass er nicht alle Nährstoffe im MRS Medium benötigt und Hefeextrakt als einzigste Quelle von Aminosäuren und Vitaminen für sein Wachstum und seine Enzymproduktion ausreichend ist. Die 3-HPA Produktion ist in Bioethanolproduktionsrückständen 68 % höher als in einer vergleichbaren Glycerinlösung bei gleichen Bedingungen und es wird weniger Biokatalysator benötigt. Eine Kombination aus Dehydratisierung und einfacher Destillation ist geeignet, um das 3-Hydroxypropionaldehyd simultan in Acrolein umzuwandeln und aus der Biotransformationsbrühe bei 37°C abzutrennen, wodurch 105 ± 8 g/l Acrolein in Wasser mit hoher Reinheit gewonnen werden können. Die Kostenschätzung eines möglichen Prozesses hat gezeigt, dass die ermittelten Kosten des Acroleins in einer Größenordnung liegen, welche zeigt, dass der angedachte Prozess bei entsprechender Optimierung in naher Zukunft zu den Produktionskosten aus Rohölderivaten aufschließen kann. Zusammenfassend konnte gezeigt werden, dass sich eine Anlehnung an den Bioethanolprozess nutzen lässt, um die biotechnologische Produktion von 3-Hydroxypropionaldehyd/ Acrolein aus nachwachsenden Rohstoffen zu verbessern. Since fossile rescources are of limited availability, chemicals from renewable resources become more interesting for scientists and the industry. Promising platform chemicals include 3-hydroxypropionaldehyde and its anhydride acrolein. However, existing approaches are not sufficient for an economic production in industrial scale. Therefore, it was examined in this thesis how far stillage, a glycerol containing byproduct of the bioethanol production process, can be used for the 3-hydroxypropionaldehyde/ acrolein production and how far this production can be integrated into the bioethanol process according to the biorefinery concept to solve existing problems and to reduce production costs. Calculations as well as batchwise and continuous experiments were carried out in 5 ml to 2 l scale in the area of biocatalyst production, biotransformation, purification and cost estimation. The whole cell biocatalyst Lactobacillus reuteri ATCC 53608 is not able to use the yeast cells from bioethanol production residues for its growth. However, it has been shown that it does not need all the nutrients in MRS medium and yeast extract is sufficient as the only source of amino acids and vitamins for its growth and enzyme production. The 3-HPA production in bioethanol production residues is 68 % higher than in a comparable aqueous glycerol solution under the same conditions and it requires less biocatalyst. A combination of dehydration and simple distillation is suitable to convert 3-hydroxypropionaldehyde into acrolein and separate it from the biotransformation broth at 37 ° C. 105 ± 8 g/l acrolein in aqueous solution were obtained in high purity. The cost estimation of a possible process has shown that the calculated cost for acrolein can likely catch up with production costs from crude oil in the near future with appropriate optimization. Hence it was shown that basing the process on stillage from the bioethanol process can improve the biotechnological production of 3-hydroxypropionaldehyde/ acrolein from renewable resources.

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    TUHH Open Research - Research Data TUHH
    Doctoral thesis . 2013
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      TUHH Open Research - Research Data TUHH
      Doctoral thesis . 2013
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    Authors: Schuster, Stefanie;

    Escherichia coli was metabolically engineered for the production of next generation biofuel 1-butanol. Therefore electrotransformation was performed with artificial plasmids harbouring the butanol-synthesis genes from Clostridium acetobutylicum and Clostridium beijerinckii. So far, the functional expression of the genes was proven by demonstrating the synthesis of 1-butanol from glucose in different E. coli strains. To investigate the butanol production in acetogenic bacteria such as Clostridium ljungdahlii, the butanol-synthesis genes were cloned into the shuttle vector pIMP1. C. ljungdahlii is able to grow on synthesis gas, a mixture of CO, CO2 and H2. Synthesis gas can be easily produced and does not compete with the food industry such as conventional butanol fermentation which uses corn or sugar as substrate. Furthermore, genome sequence analysis of C. acetobutylicum revealed a gene (CAC3330) encoding a cytochrome P450 monooxygenase (CYP152A2). The gene coding for CYP152A2 was amplified and expressed in E. coli. After overexpression and purification of P450 monooxygenase, it was demonstrated that this enzyme is able to catalyze the hydroxylation of fatty acids in the presence of hydrogen peroxide. The "ClosTron® Gene Knockout System" was used for the specific disruption of CAC3330, and in growth experiments, the consequences of the gene inactivation were determined.

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    https://dx.doi.org/10.18725/op...
    Doctoral thesis . 2016
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      Doctoral thesis . 2016
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    Authors: Weber, Malte; Geu Flores, Francisco; Raab, Dominik; Hefter, Harald; +4 Authors

    Motiviert durch ein Anwendungsbeispiel wird die Komfortzone für mobile, kinematisch redundante Manipulatoren definiert. Die Lage und Orientierung der Basis des Manipulators und die Gelenkwinkel werden so gewählt, dass ausgesuchte Zielfunktionen minimal werden. Diese Zielfunktionen werden aus bekannten Maßen wie kartesische Geschwindigkeit, Kraft und Steifigkeit abgeleitet. Sie werden abhängig von den Parametern der Basis und den Gelenkwinkeln des Manipulators bestimmt, wobei nur ein Unterraum an möglichen Konfigurationen aufgrund der vorgegebenen Lage und Orientierung des Endeffektors (EE) für die Optimierung frei wählbar ist. Es werden im Sinne der multikriteriellen Optimierung Pareto-Fronten errechnet, welche durch vordefinierte Grenzen (z.B. minimale erreichbare Kraft oder minimale erreichbare Geschwindigkeit) begrenzt werden. Motivated by an application example, the comfort zone for mobile kinematically redundant manipulators is defined. The position and orientation of the mobile platform (=base of the manipulator) and the joint angles are selected in such a way that selected target functions are minimized. These objective functions are derived from known measures such as Cartesian velocity, force and stiffness. The objective functions are evaluated depending on the parameters of the base and the joint angles of the manipulator, whereby only a subspace of possible configurations is freely selectable for optimization due to the given position and orientation of the end effector (EE). Pareto-fronts are calculated in the sense of multi-criteria optimization, which are limited by, e.g., minimum achievable force or minimum achievable speed. IFToMM D-A-CH Konferenz, vol. 2020Sechste IFToMM D-A-CH Konferenz 2020: 27./28. Februar 2020, Campus Technik Lienz

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    Authors: Rieckmann, Marco;

    With the programme “Subject-related Partnerships with Universities in Developing Countries” the German Academic Exchange Service (DAAD) supports German universities in structure-building cooperation projects with partners in countries of the South. The German-foreign cooperation aims at giving both sides new impulses in teaching and the formation of new structures at the foreign university. Since 2009 the Institute for Environmental and Sustainability Communication at the Leuphana University of Lüneburg has implemented partnership projects with universities in Ecuador and Peru sponsored by the DAAD. The scientific evaluation of the project “Teaching and Learning Sustainability” with the Universidad Técnica del Norte (UTN), Ecuador, shows that the project contributes to the integration of the concept of sustainable development in teaching, research and administration at the UTN and that it opens opportunities for global learning for all participants. However, also challenges of North-South cooperation in higher education become apparent. (DIPF/Orig.) Mit dem Förderprogramm „Fachbezogene Partnerschaften mit Hochschulen in Entwicklungsländern“ unterstützt der Deutsche Akademische Austauschdienst (DAAD) deutsche Hochschulen bei strukturbildenden Kooperationsvorhaben mit Partnern in Ländern des Südens. Die deutsch-ausländische Kooperation soll beiden Seiten neue Impulse in der Lehre geben und zur Bildung von neuen Strukturen an der ausländischen Hochschule beitragen. Das Institut für Umweltkommunikation der Leuphana Universität Lüneburg unterhält seit 2009 vom DAAD geförderte Partnerschaftsprojekte mit Hochschulen in Ecuador und Peru. Die wissenschaftliche Begleitung des Projekts „Nachhaltigkeit lehren und lernen“ mit der Universidad Técnica del Norte (UTN), Ecuador, zeigt, dass es an der UTN zur Integration des Leitbilds einer nachhaltigen Entwicklung in Lehre, Forschung und Verwaltung beiträgt und für alle Beteiligten Möglichkeiten des Globalen Lernens eröffnet. Es werden aber auch Herausforderungen der Nord-Süd-Hochschulkooperation deutlich. (DIPF/Orig.) ZEP : Zeitschrift für internationale Bildungsforschung und Entwicklungspädagogik 34 (2011) 2, S. 10-16

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    Authors: Zou, Yang;

    In polymer electrolyte fuel cells (PEFC), hydrated perfluorosulfonate ionomers such as NAFION are generally used as membrane materials. The high proton conductivity required for the application in the fuel cells comes from the water which acts as a carrier for protons in the swollen polymer membrane. A main disadvantage of such hydrated materials is that the upper limit of their useful temperature range is 100°C at normal pressure. However, when reformates or methanol is used as a fuel in fuel cells, temperatures above 100°C are required. Therefore, the development of new polymer electrolyte membrane materials for the application at high temperature, e.g. in the direct methanol fuel cell (DMFC), is attracting considerable interest. It has already been reported that heterocyclic aromates, such as imidazole, pyrazole and benzimidazole, show proton and solvent transport properties similar to water at a given temperature related to the corresponding melting point. However, due to their relatively low vapor pressures, these low molecular weight components will volatilize progressively as increasing temperature, which leads to a decrease of conductivity. One approach to overcome this limitation is to fix the proton carrier on the polymer backbone. 1,8-bis(dimethylamino)naphthalene has been selected as a carrier because of its well known proton sponge characteristics. Using this compound as carrier moiety in the side chain or main chain the different novel polymers were synthesized in this work. All synthesized polymers were characterized by different methods. Using proton sponge and functional polymers as base components, while p-toluene sulfonic acid and sulfonated polystyrene as acid components, both low molecular weight mixture and blends were prepared and inverstigated regarding their proton transfer, morphology and conductivity by FTIR, DSC and impedance spectroscopy. Im Bereich der Niedertemperatur-Brennstoffzellen kommt den protonenleitenden Membranmaterialien eine entscheidende Rolle zu. In kommerziellen Polymerelektrolyt-Brennstoffzellen (PEMC) werden gewöhnlich perfluorierte Sulfonationionomere wie z. B. Nafion als Membranmaterial eingesetzt. Ein Hauptnachteil dieser Materialien ist allerdings die begrenzte Temperaturstabilität der Membran. Oberhalb von 80°C verarmt die Membran an Wasser einhergehend mit dem Verlust an Protonenleitfähigkeit. Die Verwendung von z. B. Methanol anstelle von Wasserstoff als Brennstoff (DMFC) erfordert jedoch Temperaturen über 150°C. Die in der Literatur bekannten Ansätze Wasser als Protonencarrier zu ersetzen, basieren auf der Verwendung höhersiedender Heteroaromaten wie z.B. Imidazol, Pyrazol und Benzimidazol. Eine Verflüchtigung dieser Stoffe bei höherer Temperatur führt aber auch hier zur Verarmung an Ladungsträgereinheiten in der Membran. Ein Ansatz diese Limitierung zu umgehen, ist die Verwendung von festen Carriermembranen, bei denen die Carrierfunktion von funktionellen, am Polymer fixierten Strukturelementen übernommen wird. Im Rahmen dieser Arbeit wurden Funktionspolymere mit 1,8-Bis(dimethylamino)naphthalin- Struktureinheiten, die in der Literatur als "Protonenschwammverbindung" bekannt sind, sowohl in die Hauptkette als auch in die Seitenkette synthetisiert. Diese Funktionspolymere wurden mittels verschiedener Analytikmethoden charakterisiert. Die Mischungen des als Poylmerstrukturbaustein fungierenden 1,8-Bis(dimethylamino)-naphthalins mit p-Toluolsulfonsäure wie auch die Ionomerblends aus Funktionspolymer bzw. sulfonierten Polystyrol und niedermolekularen Komponenten wurden hergestellt und hinsichtlich ihrer Protonentransfer, Morphologie und Leitfähigkeit mittels FTIR-Spektroskopie, differentieller Wärmeflußkalorimetrie und Impedanzspektroskopie untersucht.

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    https://dx.doi.org/10.18419/op...
    Doctoral thesis . 2002
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      https://dx.doi.org/10.18419/op...
      Doctoral thesis . 2002
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    Authors: Holzhauer, Sascha; Krebs, Friedrich; Fischer, Timo; Mackensen, Reinhard;

    Dieser Bericht fasst die Ergebnisse der Sichtung und Bewertung existierender Beschreibungen und Architekturen des Systems Energie/IKT sowie Vorschläge zu nötigen Erweiterungen gemäß Task 3.1 „Architekturmodelle des Energiesystems“ und zu bestehenden und zukünftigen Datenflüssen gemäß Task 3.2. „Kommunikationsarchitekturen“ zusammen. Dazu werden zunächst eine Beschreibung sowie eine Analyse der relevanten Architekturbestandteile und der beteiligten Rollen und Akteure durchgeführt. Darauf aufbauend wird dann ein Überblick existierender Anwendungsfälle von IKT im Kontext Smart Grid gegeben und exemplarisch einzelne Fälle detaillierter analysiert. The research presented in this article was partly funded by the German Ministry for Education and Research (BMBF) under contract no "03SFK4F1".

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    Authors: Spangenberger, Pia; Draeger, Iken; Kapp, Felix; Matthes, Nadine; +3 Authors

    Im Kartenset zum digitalen Spiel "Serena Supergreen und der abgebrochene Flügel" finden sich allgemeine Informationen zum Spiel und zur Anwendung im Unterricht. Das Kartenset umfasst Vertiefungsvorschläge für den Unterricht, Berufsbilder und Experimente. The card set for the digital game "Serena Supergreen and the Broken Wing" contains general information about the game and instructions for teachers. The card set includes didactical conepts, job descriptions and experiments.

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    https://dx.doi.org/10.14279/de...
    Report . 2019
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      https://dx.doi.org/10.14279/de...
      Report . 2019
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    Authors: Hemmer, Ingrid; Döpke, Marie; Koch, Christoph; Peitz, Anna;

    Para implantar la EDS en los planes de estudios de las instituciones de enseñanza superior es indispensable impartir formación en EDS a los profesores universitarios. Basándose en modelos de competencias, el artículo presenta el concepto de dicha formación y describe, explica y discute los resultados del examen empírico de su eficacia. Se pone de manifiesto que la formación de los participantes en el ámbito de los conocimientos profesionales, especialmente en los conocimientos conceptuales, logró incrementos significativos. Se observó un aumento en las facetas no cognitivas, pero sólo resultó significativo en los ítems individuales. Zur Implementierung von BNE in die Curricula der Hochschulen sind hochschuldidaktische BNE-Fortbildungen unabdingbar. Dieser Beitrag stellt ausgehend von Kompetenzmodellen die Konzeption einer solchen Fortbildung vor und beschreibt, erläutert und diskutiert Ergebnisse der empirischen Überprüfung ihrer Wirksamkeit. Dabei wird deutlich, dass die Fortbildung bei den Teilnehmerinnen und Teilnehmern im Bereich Professionswissen, insbesondere beim Konzeptwissen, signifikante Erhöhungen erzielte. Auch bei den nicht-kognitiven Facetten ließen sich höhere Werte beobachten, die sich jedoch nur bei einzelnen Items als signifikant erwies. In order to implement ESD in the curricula of higher education institutions, ESD training for university lecturers is indispensable. Based on competency models, this article introduces an exemplary training and describes, explains, and discusses the results of the empirical review of its effectiveness. The results show that the training of the participants in the field of professional knowledge, especially in concept knowledge, achieved significant increase. Non-cognitive facets also experienced an increase; however, this only proved to be significant for individual items.

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    https://dx.doi.org/10.18452/26...
    Article . 2023
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      https://dx.doi.org/10.18452/26...
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    Authors: Barth, Matthias; Fischer, Daniel; Rode, Horst;

    Der Beitrag stellt den partizipativen Ansatz des Projektes „Bildungsinstitutionen und nachhaltiger Konsum“ (BINK) zur Entwicklung von Maßnahmen vor, die nachhaltigen Konsum bei Jugendlichen und jungen Erwachsenen in Bildungseinrichtungen fördern. Im Zentrum stehen dabei die Fragen, wie sich Konsumpräferenzen im Zusammenhang mit nachhaltiger Entwicklung und globaler Gerechtigkeit bei jungen Menschen ausprägen und inwiefern sich diese durch die Teilnahme an dem partizipativen BINK-Projekt verändern. Zur Beantwortung dieser Fragen werden Ergebnisse aus begleitenden empirischen Untersuchungen dargestellt. (DIPF/Orig.) The paper presents the participatory approach of the project “Educational Institutions and Sustainable Consumption” (BINK), which aims at developing measures of interventions to promote sustainable consumption among youths and young adults in educational organisations. It focuses on the analysis of student consumption orientations in the context of sustainable development and global justice and on how these can be changed through participation in BINK project activities. Results from an accompanying empirical study are presented to further investigate these questions raised. (DIPF/Orig.) ZEP : Zeitschrift für internationale Bildungsforschung und Entwicklungspädagogik 34 (2011) 4, S. 20-26

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    Authors: Reinfried, Sibylle; Künzle, Roland; Felder, Susanne;

    Changes in the global climate are widely discussed in science and society. The question therefore arises as to whether and how climate change is being discussed in periodicals aimed specifically at subject specific education. This paper traces the perception of climate change in these journals as part of an explorative descriptive analysis. Subject of the study were the articles on climate change, climate protection, and climate policy which were published in the period from 2006 to 2016 in eleven German-language journals related to the teaching of Geography, Biology, Chemistry, Physics, and Social Studies at the secondary level. The content analysis of the articles was carried out by means of a previously developed category system whose content and structure is based on the thematic structure of the IPPC reports. In total, 149 articles were identified. Of these, more than 64 per cent were journals relating to Geography. The number of publications varies greatly from year to year. In the years 2009 and 2015, a particularly large number of articles were published, accounting for a total of 44 per cent of the publications covered. Thematically, the publications focused on past and future changes in the climate system and their consequences. In relation to this less well represented were the topics of climate protection and climate policy, such as measures for sustainable development, avoidance of emissions and adaptation to climate change, as well as climate policy conflicts of goals and potential synergies. These findings are significant for future development work aimed at achieving climate literacy. Die Veränderungen des globalen Klimas werden in Wissenschaft und Gesellschaft breit diskutiert. Es stellt sich daher die Frage, ob und wie der Klimawandel in Zeitschriften für die Unterrichtspraxis rezipiert wird. In diesem Beitrag wird im Rahmen einer explorativen deskriptiven Analyse die Rezeption des Klimawandels in diesen Zeitschriften nachgezeichnet. Gegenstand der Untersuchung sind die Artikel, die im Zeitraum von 2006 bis 2016 in elf deutschsprachigen fachdidaktisch orientierten Zeitschriften für die Unterrichtsfächer Geographie, Biologie, Chemie, Physik und Gemeinschaftskunde zum Klimawandel und Klimaschutz/Klimapolitik publiziert wurden. Die inhaltliche Analyse der Beiträge erfolgte mittels eines zuvor entwickelten Kategoriensystems, dessen Inhalte und Aufbau sich an der thematischen Struktur der IPPC-Berichte orientiert. Gesamthaft konnten 149 Beiträge identifiziert werden. Davon stammen ca. 64% aus geographischen Unterrichtszeitschriften. Die Anzahl der Beiträge variiert stark von Jahr zu Jahr. In den Jahren 2009 und 2015 wurden besonders viele Beiträge publiziert, die zusammen 44% der erfassten Publikationen ausmachen. Thematisch liegt der Schwerpunkt der Beiträge auf den bisherigen und künftigen Änderungen des Klimasystems und den damit verbundenen Folgen. Im Verhältnis dazu sind Klimaschutz und Klimapolitik mit Maßnahmen zur nachhaltigen Entwicklung, Vermeidung von Emissionen und Anpassung an den Klimawandel sowie klimapolitische Zielkonflikte und Synergien geringer vertreten. Diese Erkenntnisse sind für zukünftige Entwicklungsarbeiten, deren Ziel die climate literacy ist, bedeutsam.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Zeitschrift für Geog...arrow_drop_down
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    https://dx.doi.org/10.18452/22...
    Article . 2018
    License: CC BY NC ND
    Data sources: Datacite
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Zeitschrift für Geog...arrow_drop_down
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      https://dx.doi.org/10.18452/22...
      Article . 2018
      License: CC BY NC ND
      Data sources: Datacite
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    Authors: Oehmke, Sebastian;

    Da fossile Quellen endlich sind, werden Chemikalien aus nachwachsenden Rohstoffen immer interessanter für die Forschung und Industrie. Zu den vielversprechenden Plattformchemikalien gehört das Stoffpaar 3-Hydroxypropionaldehyd/ Acrolein. Jedoch sind bisherige Ansätze für eine wirtschaftliche Produktion von 3-Hydroxypropionaldehyd/ Acrolein im industriellen Maßstab nicht ausreichend. Deshalb wurde in dieser Arbeit geprüft, inwieweit sich Schlempe, ein glycerinhaltiges Nebenprodukt der Bioethanolherstellung, zur 3-Hydroxypropionaldehyd/ Acrolein Produktion nutzen lässt und inwieweit diese Produktion in den Bioethanolprozess im Sinne des Bioraffineriekonzeptes integriert werden kann, um bestehende Probleme zu lösen und Produktionskosten zu reduzieren. Dazu wurden ansatzweise und kontinuierliche Versuche im 5 ml bis 2 l Maßstab sowie Berechnungen in den Bereichen Biokatalysatorproduktion, Biotransformation, Aufreinigung und Kostenschätzung durchgeführt. Der Ganzzellbiokatalysator Lactobacillus reuteri ATCC 53608 ist nicht in der Lage die Hefezellen aus Bioethanolproduktionsrückständen für sein Wachstum zu nutzen, jedoch hat sich gezeigt, dass er nicht alle Nährstoffe im MRS Medium benötigt und Hefeextrakt als einzigste Quelle von Aminosäuren und Vitaminen für sein Wachstum und seine Enzymproduktion ausreichend ist. Die 3-HPA Produktion ist in Bioethanolproduktionsrückständen 68 % höher als in einer vergleichbaren Glycerinlösung bei gleichen Bedingungen und es wird weniger Biokatalysator benötigt. Eine Kombination aus Dehydratisierung und einfacher Destillation ist geeignet, um das 3-Hydroxypropionaldehyd simultan in Acrolein umzuwandeln und aus der Biotransformationsbrühe bei 37°C abzutrennen, wodurch 105 ± 8 g/l Acrolein in Wasser mit hoher Reinheit gewonnen werden können. Die Kostenschätzung eines möglichen Prozesses hat gezeigt, dass die ermittelten Kosten des Acroleins in einer Größenordnung liegen, welche zeigt, dass der angedachte Prozess bei entsprechender Optimierung in naher Zukunft zu den Produktionskosten aus Rohölderivaten aufschließen kann. Zusammenfassend konnte gezeigt werden, dass sich eine Anlehnung an den Bioethanolprozess nutzen lässt, um die biotechnologische Produktion von 3-Hydroxypropionaldehyd/ Acrolein aus nachwachsenden Rohstoffen zu verbessern. Since fossile rescources are of limited availability, chemicals from renewable resources become more interesting for scientists and the industry. Promising platform chemicals include 3-hydroxypropionaldehyde and its anhydride acrolein. However, existing approaches are not sufficient for an economic production in industrial scale. Therefore, it was examined in this thesis how far stillage, a glycerol containing byproduct of the bioethanol production process, can be used for the 3-hydroxypropionaldehyde/ acrolein production and how far this production can be integrated into the bioethanol process according to the biorefinery concept to solve existing problems and to reduce production costs. Calculations as well as batchwise and continuous experiments were carried out in 5 ml to 2 l scale in the area of biocatalyst production, biotransformation, purification and cost estimation. The whole cell biocatalyst Lactobacillus reuteri ATCC 53608 is not able to use the yeast cells from bioethanol production residues for its growth. However, it has been shown that it does not need all the nutrients in MRS medium and yeast extract is sufficient as the only source of amino acids and vitamins for its growth and enzyme production. The 3-HPA production in bioethanol production residues is 68 % higher than in a comparable aqueous glycerol solution under the same conditions and it requires less biocatalyst. A combination of dehydration and simple distillation is suitable to convert 3-hydroxypropionaldehyde into acrolein and separate it from the biotransformation broth at 37 ° C. 105 ± 8 g/l acrolein in aqueous solution were obtained in high purity. The cost estimation of a possible process has shown that the calculated cost for acrolein can likely catch up with production costs from crude oil in the near future with appropriate optimization. Hence it was shown that basing the process on stillage from the bioethanol process can improve the biotechnological production of 3-hydroxypropionaldehyde/ acrolein from renewable resources.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ TUHH Open Research -...arrow_drop_down
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    TUHH Open Research - Research Data TUHH
    Doctoral thesis . 2013
    Data sources: Datacite
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      TUHH Open Research - Research Data TUHH
      Doctoral thesis . 2013
      Data sources: Datacite
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    Authors: Schuster, Stefanie;

    Escherichia coli was metabolically engineered for the production of next generation biofuel 1-butanol. Therefore electrotransformation was performed with artificial plasmids harbouring the butanol-synthesis genes from Clostridium acetobutylicum and Clostridium beijerinckii. So far, the functional expression of the genes was proven by demonstrating the synthesis of 1-butanol from glucose in different E. coli strains. To investigate the butanol production in acetogenic bacteria such as Clostridium ljungdahlii, the butanol-synthesis genes were cloned into the shuttle vector pIMP1. C. ljungdahlii is able to grow on synthesis gas, a mixture of CO, CO2 and H2. Synthesis gas can be easily produced and does not compete with the food industry such as conventional butanol fermentation which uses corn or sugar as substrate. Furthermore, genome sequence analysis of C. acetobutylicum revealed a gene (CAC3330) encoding a cytochrome P450 monooxygenase (CYP152A2). The gene coding for CYP152A2 was amplified and expressed in E. coli. After overexpression and purification of P450 monooxygenase, it was demonstrated that this enzyme is able to catalyze the hydroxylation of fatty acids in the presence of hydrogen peroxide. The "ClosTron® Gene Knockout System" was used for the specific disruption of CAC3330, and in growth experiments, the consequences of the gene inactivation were determined.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Open Access Reposito...arrow_drop_down
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    https://dx.doi.org/10.18725/op...
    Doctoral thesis . 2016
    Data sources: Datacite
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      https://dx.doi.org/10.18725/op...
      Doctoral thesis . 2016
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