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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: Elmenhorst, Eva-Maria; Benderoth, S.; Vejvoda, M.; Wenzel, J.; +1 Authors

    Introduction The sleep inducing effects of alcohol as well as the increase in sleep propensity and sleepiness after sleep loss have been linked to the adenosinergic system in the brain. While the performance impairing effects of ethanol have partly been related to the inhibitory effects of cerebral adenosine, sleep loss has been found to increase adenosine receptor density. The interindividual variability of cognitive performance impairments after alcohol intake as well as after sleep loss is extensive. Thus, we examined in humans whether performance degradations resulting from sleep loss and alcohol consumption are related. Methods Performance in a 10-min Psychomotor Vigilance Task (PVT) was tested in 47 healthy volunteers (mean age 27 ± 5 (SD) years, 21 females) at 6 pm 1) after an 8 hour control night, 2) after alcohol consumption (aiming at a blood alcohol concentration (BAC) of 0.08%), and 3) after 35 hours of total sleep deprivation. After alcohol intake, 35 of the participants reached a BAC of more than 0.06% prior to the performance testing (mean BAC 0.074%, SD 0.009%, min. 0.063%, max. 0.095%) and were included in the analyses. Two recovery nights were scheduled between conditions. Results Performance impairments due to acute alcohol intake and due to 35 hours of sustained wakefulness were calculated as differences from performance under control conditions. The degree in performance degradation correlated highly between both conditions (i.e. 10% slowest reaction times: Pearson’s r=0.73, p<0.0001; standard deviation of reaction times: r=0.75, p<0.0001; mean reaction time: r=0.59, p=0.0002). Conclusions Participants whose PVT performance proved to be vulnerable to the effects of alcohol consumption were also vulnerable to sleep loss, whereas individuals who were resilient against the effects of alcohol were also less susceptible to the impact of sleep deprivation. These results suggest that the effects of alcohol and sleep deprivation on performance are mediated – at least in part – by a common pathway that may involve the adenosinergic system in the brain.

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    Conference object . 2016
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    Other literature type . 2016
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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/ DLR publication serv...arrow_drop_down
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      Other literature type . 2016
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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: Wendorff, Laura Deborah;

    This study presents a future projection for the German energy system in 2050 in spatial and temporal resolution. The 319 rural districts in Germany are examined and divided into nine clusters according to twenty indicators. For each cluster, the realizable energy supply potential from renewable energies is determined. The electricity demand for the year 2050 is increased by a factor of four com-pared to today's demand. The following time series analysis is done in 15-minute resolution. Five of the nine clusters can be fully self-sufficient in 2050 at time resolution and on balance. These five clusters represent the majority of the population (55.24%) and the area (67.76%) in Germany. The renewable energy supply in rural areas amounts to about 1,122 TWh. In balance, Germany has an energy shortage of 205 TWh in rural areas alone. In addition, about 1,000 TWh electricity demand can be expected in urban areas. Independence from international electricity imports will only be feasible for Germany if demand is drastically reduced. The results of this work allow a clear knowledge of potential and expected demand on the local level and thus a target-oriented expansion planning. On the national level, however, the temporally and spatially resolved knowledge of expected potential and requirements is of great importance for energy policy. Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2022; Aachen : RWTH Aachen University 1 Online-Ressource : Illustrationen (2022). = Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2022 Published by RWTH Aachen University, Aachen

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    https://dx.doi.org/10.18154/rw...
    Doctoral thesis . 2022
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      https://dx.doi.org/10.18154/rw...
      Doctoral thesis . 2022
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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: Boer, Lukas;

    Diese Dissertation beantwortet verschiedene politikrelevante ökonomische Fragen in den Bereichen Handelspolitik, Geldpolitik, sowie Rohstoffmärkte und Energieökonomik mit Hilfe von strukturellen Vektorautoregressionsmodellen (SVAR). SVARs stellen eine effektive Möglichkeit dar, die Beziehungen zwischen verschiedenen makroökonomischen und/oder Finanzmarkt-Variablen zu modellieren und werden verwendet, um die dynamischen kausalen Effekte von ökonomischen Schocks zu schätzen. Für jede ökonomische Fragestellung wird eine Identifikationsstrategie angewandt, die auf die betrachteten Daten und ihre statistischen Eigenschaften sowie die zugrundeliegenden Annahmen über ökonomische Mechanismen zwischen den betrachteten Zeitreihen zugeschnitten ist. Im Einzelnen besteht diese Dissertation aus vier Kapiteln. In den ersten beiden Kapiteln werden die Auswirkungen von Handelspolitik auf Finanzmärkte und auf die Makroökonomie geschätzt. Das dritte Kapitel liefert einen methodischen Beitrag zur SVAR-Literatur, der in einer Anwendung zu den Effekten von Geldpolitik dargestellt wird. Das letzte Kapitel verlässt die Felder der Handels- und Geldpolitik und wendet sich Rohstoffmärkten und der Energiewirtschaft zu, stützt sich dabei aber ebenfalls auf Zeitreihenmethoden. Es analysiert die Rolle von Metallen in der Energiewende. This dissertation answers various policy relevant economic questions in the fields of trade policy, monetary policy, and commodity markets and energy economics using structural vector autoregression (SVAR) models. SVARs constitute a parsimonious way to model the relations between different macroeconomic and/or financial variables and they are used to estimate the dynamic causal effects of economic shocks. For each economic question, this dissertation applies an identification strategy that is tailored to the relevant data and its statistical properties as well as the underlying assumptions about economic mechanisms among the regarded time series. Specifically, this dissertation consists of four chapters. The first two chapters estimate the effects of trade policy on financial markets and on the macroeconomy. The third chapter makes a methodological contribution to the SVAR literature in an application to monetary policy shocks. The final chapter moves away from trade and monetary policy to commodity markets and energy economics but also relies on time series methods. It analyzes the role of metals for the clean energy transition.

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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/ Publikationsserver d...arrow_drop_down
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  • Authors: Peter, Elsner; M��ller-Kirschbaum, Thomas; Schweitzer, Katharina; Wolf, Ronja; +35 Authors

    Heutige Produktions- und Konsummuster folgen weitgehend einer linearen Logik: abbauen, herstellen, konsumieren, entsorgen. Nur neun Prozent der Weltwirtschaft sind laut Circular Gap Report 2020 kreislaufgef��hrt. Doch dieses Wirtschaftsprinzip tr��gt zu einer massiven ��berschreitung der ���Planetaren Grenzen��� und damit zu einer Destabilisierung der ��kosysteme und Lebensgrundlage der Menschen bei, wie etwa des Klimasystems und der Artenvielfalt. Demzufolge wird derzeit viel ��ber einen Paradigmenwechsel in der Logik industrieller Wertsch��pfung diskutiert ��� weg von einem ressourcenintensiven hin zu einem ressourcenproduktiven, weitgehend kreislaufgef��hrten Modell. F��r das Industrie- und Exportland Deutschland ergeben sich weitreichende Chancen, schlie��lich bedeutet dieser Wechsel nicht weniger als eine Neuinterpretation des Modells ���Made in Germany���. Die Europ��ische Union und zahlreiche Mitgliedsl��nder haben bereits strategische Pl��ne f��r einen ��bergang zu einer ressourcenschonenden Wirtschaftsweise nach den Prinzipien der Circular Economy entwickelt. Auch au��erhalb von Europa folgen L��nder dieser Leitidee, beispielsweise China, Japan oder Kanada. F��r Deutschland fehlt solch ein Plan derzeit. Die Circular Economy Initiative Deutschland (CEID) hat zum Ziel, als Multi-Stakeholder-Prozess mit mehr als f��nfzig Institutionen aus Wirtschaft, Wissenschaft und Zivilgesellschaft die Grundlage f��r einen solchen Plan zu legen. In interdisziplin��ren und branchen��bergreifenden Arbeitsgruppen er��rtern rund 130 Expertinnen und Experten, wie zirkul��re Wirtschaftssysteme erm��glicht und umgesetzt werden k��nnen. Dazu untersuchen sie m��gliche Anwendungsfelder und diskutieren, welche Rahmenbedingungen zu einer erfolgreichen Umsetzung f��hren k��nnten. Die Circular Economy Initiative Deutschland definiert Ziele f��r diesen Ver��nderungsprozess und fokussiert folgende Themen: - Zirkul��re Gesch��ftsmodelle und digitale Technologien als Innovationstreiber - Neue Wertsch��pfungsnetzwerke f��r Batterien und Verpackung - Rahmenbedingungen f��r eine zirkul��re Transformation und Bemessung der volkswirtschaftlichen Circular-Economy-Potenziale Zwischen Oktober 2019 und Dezember 2020 hat die Arbeitsgruppe Verpackung der Circular Economy Initiative Deutschland ein gemeinsames Zielbild 2030 und Handlungsempfehlungen hin zu einer Kreislaufwirtschaft (CE) f��r Verpackungen entwickelt. Mit einer wertsch��pfungsketten��bergreifenden Betrachtung hat die Arbeitsgruppe Anreiz und Nutzen f��r die Kreislauff��hrung von Verpackungsmaterialien zwischen relevanten Akteuren beleuchtet und dadurch Handlungsoptionen entlang der gesamten Wertsch��pfungskette identifiziert. Damit unterst��tzen die Mitglieder die Initiierung, Umsetzung und langfristige Verankerung der Circular Economy in Deutschland und dar��ber hinaus. Mit 20 Mitgliedsorganisationen der Arbeitsgruppe ���Verpackung��� umfassen die Mitglieder Vertreterinnen und Vertreter aus f��hrenden deutschen Unternehmen, akademischen Institutionen und zivilgesellschaftlichen Vereinigungen ��ber die gesamte Wertsch��pfungskette hinweg. Damit konnte die Arbeitsgruppe ihr Ziel erreichen, eine wissenschaftlich fundierte und m��glichst ganzheitliche Betrachtung des Themas zu gew��hrleisten. Most current patterns of production and consumption follow a linear ���extract, produce, consume, dispose��� model. According to the Circular Gap Report 2020, the global economy is just 9% circular. This economic model is contributing to a massive transgression of ���planetary boundaries��� and the destabilisation of ecosystems and factors essential to human life such as the climate system and biodiversity. As a result, there is currently much discussion of a paradigm shift in the industrial value creation model, away from a resource-intensive system and towards a resource-productive, predominantly circular model. This shift offers significant opportunities for an industrialized, exporting nation like Germany ��� ultimately, it entails nothing less than a recasting of the ���Made in Germany��� model. The European Union and several of its member states have already developed strategic plans for the transition to a resource-efficient economic system based on circular economy principles. Non-European countries such as China, Japan and Canada are also following the same fundamental approach. However, Germany has yet to formulate a plan of its own. The Circular Economy Initiative Deutschland (CEID) is a multi-stakeholder initiative involving over fifty institutions from science, industry and civil society that aims to lay the foundations of a plan for Germany. In its interdisciplinary, cross-sectoral working groups, some 130 experts consider how to enable and implement circular economic models, exploring potential fields of application and discussing the conditions that could facilitate successful implementation. The Circular Economy Initiative Deutschland is developing targets for the transition, with a focus on the following themes: - Circular business models and digital technologies as drivers for innovation - New value networks for batteries and packaging - Framework conditions for a circular transformation and assessment of circularity���s economic potential Between October 2019 und December 2020, the Working Group ���Packaging��� of the Circular Economy Initiative Deutschland developed a joint target picture 2030 and recommendations for action for the establishment of a Circular Economy for packaging. With a cross-value chain approach, the Working Group highlighted incentives and benefits for the recycling of packaging materials across relevant stakeholders and thereby identified options for action along the entire value chain. With the report, the members support the initiation, implementation and long-term anchoring of the Circular Economy in Germany and beyond. The 20 members of the Working Group ���Packaging��� are experts from leading academic institutions, German businesses and civil society across the entire packaging value chain. This composition allowed the group to achieve its goal of addressing the topic as holistically as possible.

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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: Abdel-Nabi, Riad;

    Effect of ethanol on amino acids and related compounds in rat plasma, heart, aorta, bronchus, and pancreas. The composition of 36 amino acids and related compounds is presented for plasma, heart, aorta, bronchus and pancreas. The distribution pattern of these biochemicals is similar but not identical among the tissues. The effect of an acute dose of ethanol (2g/kg,IP) on these amino acids and related compounds was then studied. In the plasma, alanine, arginine, aspartic acid, beta-alanine, glycine, phenylalanine, and serine are decreased. In the aorta, ammonia and taurine are decreased. In the heart, aspartic acid and leucine are decreased, and carnosine, GABA, glutamic acid, and ornithine are increased. In the pancreas, asparagine and taurine are decreased, and citrulline, cysteine, histidine and isoleucine are increased. In the bronchi, GABA, ethanolamine, histidine, taurine, and isoleucine are decreased. A number of correlations of some compounds in plasma or tissues were found but differed often between control and ethanol-treated animals. Ethanol-induced tissue changes generally do not correlate with plasma changes and are mostly specific for a given tissue. Effekte einer akuten Dosis Ethanol (2g/kg, IP) auf bestimmte Aminosäuren und verwandte Verbindungen wurden untersucht. Die Aminosäurespiegel bzw. deren Verteilung ist ähnlich, aber nicht gleich, in den verschiedenen Geweben. In den verschiedenen Geweben fanden wir teilweise erniedrigte Spiegel, teilweise aber auch erhöhte Spiegel nach Ethanol-Gabe. Diese Veränderungen bezogen sich 1. auf die einzelnen Aminosäuren oder 2. auf die unterschiedlich- en Gewebe. Eine Anzahl Korrelationen einiger Aminoverbindungen in Plasma oder Geweben wurde gefunden, waren aber oft unterschiedlich zwischen Kontroll- und Ethanolratten. Ethanol-induzierte Veränderungen in den Geweben korrelieren im Allgemeinen nicht mit den Veränderungen im Plasma und sind meistens für die untersuchten Gewebe spezifisch.

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    https://dx.doi.org/10.17192/z2...
    Doctoral thesis . 2005
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      https://dx.doi.org/10.17192/z2...
      Doctoral thesis . 2005
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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
    Data sources: Datacite
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      TUHH Open Research - Research Data TUHH
      Doctoral thesis . 2013
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    Authors: Stock, Tim Erwin;

    Im heutigen Zeitalter des Anthropozäns stehen die Industrie-, Schwellen- und Entwicklungsländer vor vielfältigen Nachhaltigkeitsherausforderungen, die durch globale Trends im Handlungsfeld umweltbezogener, gesellschaftlicher und wirtschaftlicher Dimension menschlichen Wirkens hervorgerufen werden. Dazu zählen die steigende sozio-ökonomische Ungleichheit, der Klimawandel, die zunehmende Umweltbelastung, Urbanisierung sowie der Anstieg der Cyberabhängigkeit. Diese Trends führen in den einzelnen Ländern zu unterschiedlichen, regional ausgeprägten Risiken, wie z. B. soziale Instabilität, Unterbeschäftigung, unfreiwillige Migration, Wasserkrisen, Naturkatastrophen, Ressourcenverknappung oder Cyberattacken. Zur langfristigen Bewältigung der globalen Nachhaltigkeitsherausforderungen haben die Mitgliedsländer der Vereinten Nationen die Agenda 2030 verabschiedet. Diese umfasst 17 unteilbare und sich selbst bedingende Ziele für eine nachhaltige Entwicklung, die als Vorgabe für eine Transformation der Volkswirtschaften von einer meist rein ökonomisch geprägten hin zu einer auf Nachhaltigkeit ausgerichteten Entwicklung dienen. Zur Umsetzung der Agenda 2030 sollen insbesondere globale, nationale, regionale und lokale Anspruchsgruppen maßgeblich beitragen, indem sie zielgerichtete Handlungen zur nachhaltigen Entwicklung planen, ausführen und steuern. Start-Ups können bottom-up dazu beitragen, nachhaltige Ideen durch die Entwicklung technischer Innovationen am Markt zu etablieren. Durch die marktwirtschaftliche Dynamik von Kooperation und Wettbewerb in globalen Wertschöpfungs- und Wissensnetzwerken können technische Innovationen somit langfristig die Transformation in Richtung einer nachhaltigen Entwicklung fördern. Start-Ups müssen daher befähigt werden, eigenständig nachhaltige Innovationen systematisch zu entwickeln. Es wird dazu eine Vorgehensweise erforscht, die die integrierte Entwicklung eines technischen Produktes und zugehörigen Geschäftsmodelles als relevante Teilsysteme einer Innovation ermöglicht. Die Vorgehensweise deckt die frühere und spätere Phase der Innovationsentwicklung ab. Sie ermöglicht die einfache Suche nachhaltiger Lösungen zur Entwicklung der Innovation. Dazu werden die Werte sowie Ziele und Prinzipien einer nachhaltigen Entwicklung in die Vorgehensweise eingebunden. Die Vorgehensweise orientiert sich dabei an den besonderen Bedürfnissen von Start-Ups zur Erschließung neuer Märkte sowie zur Realisierung von Wettbewerbsvorteilen auf bestehenden Märkten. Die Implementierung und Erprobung der Vorgehensweise erfolgt exemplarisch für unterschiedliche industrielle und universitäre Start-Ups. In today's age of the Anthropocene, newly and early industrialized countries are facing a variety of sustainability challenges caused by global trends in the environmental, social, and economic dimensions of human activities, such as a growing socio-economic inequality, climate change, increasing environmental degradation, urbanization, and an increasing cyber-dependency. These global trends are leading to different regional risks, e.g. social instability, underemployment, involuntary migration, water crises, natural catastrophes, resource depletion, or cyberattacks. For coping with the challenges in the long run, the General Assembly of the United Nations adopted the Agenda 2030, which applies equally to all countries in the world. The Agenda 2030 includes 17 indivisible and self-sustaining goals. These so-called Sustainable Development Goals are intended to serve as the foundation for a transformation of the global economies towards a sustainable development. The implementation of the Agenda 2030 requires a significant contribution from global, national, regional, and local stakeholders by planning, running, and controlling activities related to a sustainable development. Bottom-up, startups can essentially contribute by expanding sustainable inventions to competitive, technological innovations. By means of the market dynamics of cooperation and competition in global value creation and knowledge networks, these sustainable innovations can foster a global sustainable development. Thus, startups must be enabled to systematically develop sustainable innovations independently. For this purpose, a procedure is being researched which enables the integrated development of a technical product and related business model as relevant subsystems of an innovation. The procedure covers the early and late phase of the innovation development. It allows the search for sustainable solutions during the development of the innovation in a simple manner. To this end, values, goals, and principles of a sustainable development are integrated. The procedure is oriented towards the special needs of startups for opening up new markets and realizing competitive advantages in existing markets. The implementation and testing of the procedure is exemplary carried out for different industrial and university startups.

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    Doctoral thesis . 2019
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    https://dx.doi.org/10.14279/de...
    Doctoral thesis . 2019
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Welzholz, Anna Catrin Sara;

    Die Magen-Darm-Motilität von Patienten auf Intensivstationen unterliegt vielen hemmenden Einflüssen. Außer der Wirkung inhibitorisch wirksamer Pharmaka wäre denkbar, dass auch organische Lösungsmittel (Ethanol, DMSO), Detergentien (SLS/CAPB) und aus Perfusor- und Infusionsleitungen freigesetzte Weichmacher (Phthalate) die Dünndarmperistaltik per se beeinflussen oder die Wirkung inhibitorisch wirksamer Pharmaka (Midazolam, Fentanyl) modulieren. Die Untersuchungen wurden in vitro am Dünndarm des Meerschweinchens durchgeführt. Der Parameter zur Beurteilung der inhibitorischen Wirkung auf die Peristaltik einer dem Organbad zugegebenen Substanz war die Änderung des intraluminalen Schwellendrucks ΔPPT (peristaltic pressure threshold) zur Auslösung von Peristaltik. Ein Anstieg der PPT zeigt eine inhibitorische Wirkung an. In der Zusammenschau der Ergebnisse aller Experimente der vorliegenden Arbeit zeigte sich, dass weder DEHP, Ethanol, DMSO noch Detergentien (SLS/CAPB) per se eine konzentrationsabhängige, signifikant hemmende Wirkung auf die Dünndarmperistaltik haben. Jedoch vermochten Ethanol, sowohl extraserosal dem Organbad zugegeben als auch endoluminal durch das Dünndarmsegment perfundiert, und in Ethanol gelöstes DEHP die motilitätshemmende Wirkung von Midazolam bzw. Fentanyl zu verstärken. In den Untersuchungen fiel auf, dass die Schwellendruckänderungen ΔPPT nach Zugabe von Ethanol, unabhängig von der jeweiligen Konzentration, sehr heterogen waren. Um den Mechanismus der Ethanolwirkung genauer zu charakterisieren, wurden Darmsegmente vor der Zugabe von Ethanol mit Antagonisten bzw. Blockern vermuteter Signaltransduktionswege vorbehandelt. Eingesetzt wurden Naloxon (Antagonist an Opioidrezeptoren), Apamin (Inhibitor von calciumaktivierten small conductance Kaliumkänalen), Bicucullin (Antagonist am GABAA-Rezeptor), Lorglumid (Antagonist am Cholecystokinin CCKA-Rezeptor) und YM022 (selektiver Antagonist am Gastrin/CCKB-Rezeptor). Diese Antagonisierungsversuche ergaben keine signifikanten Ergebnisse, da Ethanol in der Konzentration mit inhibitorischer Wirkung auf die Peristaltik zu heterogene Änderungen der PPT hervorrief. Unter klinischen Gesichtspunkten könnten die hemmende Wirkung von Ethanol auf die Peristaltik sowie die Wirkungsverstärkung des motilitätshemmenden Midazolam und Fentanyl durch Ethanol bzw. in Ethanol gelöstes DEHP Faktoren sein, die zur Hemmung der Darmmotilität bei Intensivpatienten beitragen. Critically ill patients' gastro-intestinal-motility is subject to many inhibiting factors. Apart from medicaments also organic solvents (ethanol, DMSO), detergents (SLS/CAPB) and plasticizers (phthalates) which are delivered from infusion lines may influence the action of the bowels per se or modulate the effect of inhibiting pharmaceutics. The investigations were performed on guinea pigs' small intestine in vitro. The modification of the intra-luminal PPT (peristaltic pressure threshold) was measured to estimate the inhibiting effect of a substance on the peristalsis. An increasing PPT shows an inhibiting effect. Overall, neither DEHP, ethanol, DMSO nor detergents (SLS/CAPB) per se had a significant, inbiting effect on the peristalsis. However, ethanol added to the organ bath as well as added via perfusion through the gut segment aggravated the inhibitoring effect of midazolame. The same effect was observed when gut segments were perfused by DEHP solute in ethanol and fentanyl was added to the organ bath. Furthermore, the behaviour of ethanol was very heterogeneous. To characterize ethanol's mechanisms of action different gut segments were pretreated with antagonists or inhibitors of suspected signal transduction pathways. Therefore naloxone (opiod receptor antagonist), apamin (inhibitor of calcium activated small conductance sodium channels), bicucullin (GABA-A receptor antagonist), lorglumide (CCK-A receptor antagonist) and YM 022 (CCK-B receptor antagonist) were used. None of these experiments brought any significant result but also very heterogeneous alterations of the PPT. Under clinical aspects the inhibiting effects of ethanol on the peristalsis as well as the aggravation of the inhibting effects of midazolame and fentanyl by ethanol or DEHP solute in ethanol may be factors which may be conducive to the gastro intestinal atony of the critically ill patient.

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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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      https://dx.doi.org/10.18725/op...
      Doctoral thesis . 2016
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    Authors: Wittmer, Heidi; Berger, Thomas; Wittmer, Heidi; Berger, Thomas;

    The agreement on the Clean Development Mechanism as a flexible instrument of emissions reduction within the Kyoto protocol opens up new perspectives for the implementation of regenerative energy projects in developing countries. Bioenergy presently covers about one third of the total energy demand in developing countries. Especially in many rural regions it constitutes the cheapest if not the only energy source, and although numerous technologies are available for increased and improved use, their application remains limited. The present study addresses the question as to why this technical potential has not yet been taken advantage of. It investigates the socio-economic and institutional challenges of increased use of renewable energy in developing countries. Based on this analysis suggestions for energy and climate protection policies are derived. The literature dealing with dissemination of technologies supports the assumption that non-technical barriers limit an increased use of renewable energy in developing countries, especially on the demand side. The study therefore parts from a system analysis of the energy sector, in which the decisions of the energy users stand in front. As a first step of this analysis, the context of the energy supply in developing countries is investigated. The study reveals that especially economic and political/institutional barriers are widespread and similar across different countries. Contrarily, ecological and socio-cultural conditions differ strongly between applications and between countries. It can be concluded that political barriers at present still limit an increased spread of renewable energy use. However, deregulation and market liberalisation processes currently under way can, if well conceived, open up considerable new potentials. An analysis of the role of the different barriers within the general context precedes their discussion with regard to the following renewable energy sources: 1) Solid combustibles are the most important energy source, based on their present use. They have the largest potential for increased use under corresponding economic and political/institutional conditions. This is especially true for modern forms of power generation. 2) Biogas has a significant ecological potential. However, it is more complex to utilise, so that a successful implementation is conditioned by many prerequisites. 3) Biofuels (non-fossil fuels) have a large implementation potential in some countries if their use is supported and subsidised. The advantages and disadvantages of such a subsidy must be carefully considered. The importance of biofuels world-wide is restricted and their utilisation potential compared to hydrogen-based fuel appears rather limited. Poorer population groups depend on renewable energy sources in a special way. Firstly, biomass is the most important, sometimes the only, energy source in these households. Secondly, many poor households earn a substantial amount of their income through the sale of biomass for energy use. It is shown that to improve the energy supply to poorer households, an expansion of commercial energy production is needed, especially of electricity. The optimal structure of subsidies is discussed. The study concludes that only those political measures that make renewable energy sources look more attractive from the view of the energy user, can contribute to taking advantage of the technical potential for the reduction of CO2. Accordingly, recommendations are derived at three different levels: 1) General opportunities for the promotion of bioenergy such as technology development, information dissemination and improvement of education. 2) Potentials at the national policy level, especially for enhancing the supply of modern energy carriers based on biomass. 3) Recommendations for the design of projects in the energy sector.

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    Research . 2002
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    https://dx.doi.org/10.22004/ag...
    Other literature type . 2002
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      Research . 2002
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      https://dx.doi.org/10.22004/ag...
      Other literature type . 2002
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15 Research products
  • 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: Elmenhorst, Eva-Maria; Benderoth, S.; Vejvoda, M.; Wenzel, J.; +1 Authors

    Introduction The sleep inducing effects of alcohol as well as the increase in sleep propensity and sleepiness after sleep loss have been linked to the adenosinergic system in the brain. While the performance impairing effects of ethanol have partly been related to the inhibitory effects of cerebral adenosine, sleep loss has been found to increase adenosine receptor density. The interindividual variability of cognitive performance impairments after alcohol intake as well as after sleep loss is extensive. Thus, we examined in humans whether performance degradations resulting from sleep loss and alcohol consumption are related. Methods Performance in a 10-min Psychomotor Vigilance Task (PVT) was tested in 47 healthy volunteers (mean age 27 ± 5 (SD) years, 21 females) at 6 pm 1) after an 8 hour control night, 2) after alcohol consumption (aiming at a blood alcohol concentration (BAC) of 0.08%), and 3) after 35 hours of total sleep deprivation. After alcohol intake, 35 of the participants reached a BAC of more than 0.06% prior to the performance testing (mean BAC 0.074%, SD 0.009%, min. 0.063%, max. 0.095%) and were included in the analyses. Two recovery nights were scheduled between conditions. Results Performance impairments due to acute alcohol intake and due to 35 hours of sustained wakefulness were calculated as differences from performance under control conditions. The degree in performance degradation correlated highly between both conditions (i.e. 10% slowest reaction times: Pearson’s r=0.73, p<0.0001; standard deviation of reaction times: r=0.75, p<0.0001; mean reaction time: r=0.59, p=0.0002). Conclusions Participants whose PVT performance proved to be vulnerable to the effects of alcohol consumption were also vulnerable to sleep loss, whereas individuals who were resilient against the effects of alcohol were also less susceptible to the impact of sleep deprivation. These results suggest that the effects of alcohol and sleep deprivation on performance are mediated – at least in part – by a common pathway that may involve the adenosinergic system in the brain.

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    DLR publication server
    Conference object . 2016
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    DLR publication server
    Other literature type . 2016
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      Conference object . 2016
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      DLR publication server
      Other literature type . 2016
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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: Wendorff, Laura Deborah;

    This study presents a future projection for the German energy system in 2050 in spatial and temporal resolution. The 319 rural districts in Germany are examined and divided into nine clusters according to twenty indicators. For each cluster, the realizable energy supply potential from renewable energies is determined. The electricity demand for the year 2050 is increased by a factor of four com-pared to today's demand. The following time series analysis is done in 15-minute resolution. Five of the nine clusters can be fully self-sufficient in 2050 at time resolution and on balance. These five clusters represent the majority of the population (55.24%) and the area (67.76%) in Germany. The renewable energy supply in rural areas amounts to about 1,122 TWh. In balance, Germany has an energy shortage of 205 TWh in rural areas alone. In addition, about 1,000 TWh electricity demand can be expected in urban areas. Independence from international electricity imports will only be feasible for Germany if demand is drastically reduced. The results of this work allow a clear knowledge of potential and expected demand on the local level and thus a target-oriented expansion planning. On the national level, however, the temporally and spatially resolved knowledge of expected potential and requirements is of great importance for energy policy. Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2022; Aachen : RWTH Aachen University 1 Online-Ressource : Illustrationen (2022). = Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2022 Published by RWTH Aachen University, Aachen

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    https://dx.doi.org/10.18154/rw...
    Doctoral thesis . 2022
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      https://dx.doi.org/10.18154/rw...
      Doctoral thesis . 2022
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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: Boer, Lukas;

    Diese Dissertation beantwortet verschiedene politikrelevante ökonomische Fragen in den Bereichen Handelspolitik, Geldpolitik, sowie Rohstoffmärkte und Energieökonomik mit Hilfe von strukturellen Vektorautoregressionsmodellen (SVAR). SVARs stellen eine effektive Möglichkeit dar, die Beziehungen zwischen verschiedenen makroökonomischen und/oder Finanzmarkt-Variablen zu modellieren und werden verwendet, um die dynamischen kausalen Effekte von ökonomischen Schocks zu schätzen. Für jede ökonomische Fragestellung wird eine Identifikationsstrategie angewandt, die auf die betrachteten Daten und ihre statistischen Eigenschaften sowie die zugrundeliegenden Annahmen über ökonomische Mechanismen zwischen den betrachteten Zeitreihen zugeschnitten ist. Im Einzelnen besteht diese Dissertation aus vier Kapiteln. In den ersten beiden Kapiteln werden die Auswirkungen von Handelspolitik auf Finanzmärkte und auf die Makroökonomie geschätzt. Das dritte Kapitel liefert einen methodischen Beitrag zur SVAR-Literatur, der in einer Anwendung zu den Effekten von Geldpolitik dargestellt wird. Das letzte Kapitel verlässt die Felder der Handels- und Geldpolitik und wendet sich Rohstoffmärkten und der Energiewirtschaft zu, stützt sich dabei aber ebenfalls auf Zeitreihenmethoden. Es analysiert die Rolle von Metallen in der Energiewende. This dissertation answers various policy relevant economic questions in the fields of trade policy, monetary policy, and commodity markets and energy economics using structural vector autoregression (SVAR) models. SVARs constitute a parsimonious way to model the relations between different macroeconomic and/or financial variables and they are used to estimate the dynamic causal effects of economic shocks. For each economic question, this dissertation applies an identification strategy that is tailored to the relevant data and its statistical properties as well as the underlying assumptions about economic mechanisms among the regarded time series. Specifically, this dissertation consists of four chapters. The first two chapters estimate the effects of trade policy on financial markets and on the macroeconomy. The third chapter makes a methodological contribution to the SVAR literature in an application to monetary policy shocks. The final chapter moves away from trade and monetary policy to commodity markets and energy economics but also relies on time series methods. It analyzes the role of metals for the clean energy transition.

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  • Authors: Peter, Elsner; M��ller-Kirschbaum, Thomas; Schweitzer, Katharina; Wolf, Ronja; +35 Authors

    Heutige Produktions- und Konsummuster folgen weitgehend einer linearen Logik: abbauen, herstellen, konsumieren, entsorgen. Nur neun Prozent der Weltwirtschaft sind laut Circular Gap Report 2020 kreislaufgef��hrt. Doch dieses Wirtschaftsprinzip tr��gt zu einer massiven ��berschreitung der ���Planetaren Grenzen��� und damit zu einer Destabilisierung der ��kosysteme und Lebensgrundlage der Menschen bei, wie etwa des Klimasystems und der Artenvielfalt. Demzufolge wird derzeit viel ��ber einen Paradigmenwechsel in der Logik industrieller Wertsch��pfung diskutiert ��� weg von einem ressourcenintensiven hin zu einem ressourcenproduktiven, weitgehend kreislaufgef��hrten Modell. F��r das Industrie- und Exportland Deutschland ergeben sich weitreichende Chancen, schlie��lich bedeutet dieser Wechsel nicht weniger als eine Neuinterpretation des Modells ���Made in Germany���. Die Europ��ische Union und zahlreiche Mitgliedsl��nder haben bereits strategische Pl��ne f��r einen ��bergang zu einer ressourcenschonenden Wirtschaftsweise nach den Prinzipien der Circular Economy entwickelt. Auch au��erhalb von Europa folgen L��nder dieser Leitidee, beispielsweise China, Japan oder Kanada. F��r Deutschland fehlt solch ein Plan derzeit. Die Circular Economy Initiative Deutschland (CEID) hat zum Ziel, als Multi-Stakeholder-Prozess mit mehr als f��nfzig Institutionen aus Wirtschaft, Wissenschaft und Zivilgesellschaft die Grundlage f��r einen solchen Plan zu legen. In interdisziplin��ren und branchen��bergreifenden Arbeitsgruppen er��rtern rund 130 Expertinnen und Experten, wie zirkul��re Wirtschaftssysteme erm��glicht und umgesetzt werden k��nnen. Dazu untersuchen sie m��gliche Anwendungsfelder und diskutieren, welche Rahmenbedingungen zu einer erfolgreichen Umsetzung f��hren k��nnten. Die Circular Economy Initiative Deutschland definiert Ziele f��r diesen Ver��nderungsprozess und fokussiert folgende Themen: - Zirkul��re Gesch��ftsmodelle und digitale Technologien als Innovationstreiber - Neue Wertsch��pfungsnetzwerke f��r Batterien und Verpackung - Rahmenbedingungen f��r eine zirkul��re Transformation und Bemessung der volkswirtschaftlichen Circular-Economy-Potenziale Zwischen Oktober 2019 und Dezember 2020 hat die Arbeitsgruppe Verpackung der Circular Economy Initiative Deutschland ein gemeinsames Zielbild 2030 und Handlungsempfehlungen hin zu einer Kreislaufwirtschaft (CE) f��r Verpackungen entwickelt. Mit einer wertsch��pfungsketten��bergreifenden Betrachtung hat die Arbeitsgruppe Anreiz und Nutzen f��r die Kreislauff��hrung von Verpackungsmaterialien zwischen relevanten Akteuren beleuchtet und dadurch Handlungsoptionen entlang der gesamten Wertsch��pfungskette identifiziert. Damit unterst��tzen die Mitglieder die Initiierung, Umsetzung und langfristige Verankerung der Circular Economy in Deutschland und dar��ber hinaus. Mit 20 Mitgliedsorganisationen der Arbeitsgruppe ���Verpackung��� umfassen die Mitglieder Vertreterinnen und Vertreter aus f��hrenden deutschen Unternehmen, akademischen Institutionen und zivilgesellschaftlichen Vereinigungen ��ber die gesamte Wertsch��pfungskette hinweg. Damit konnte die Arbeitsgruppe ihr Ziel erreichen, eine wissenschaftlich fundierte und m��glichst ganzheitliche Betrachtung des Themas zu gew��hrleisten. Most current patterns of production and consumption follow a linear ���extract, produce, consume, dispose��� model. According to the Circular Gap Report 2020, the global economy is just 9% circular. This economic model is contributing to a massive transgression of ���planetary boundaries��� and the destabilisation of ecosystems and factors essential to human life such as the climate system and biodiversity. As a result, there is currently much discussion of a paradigm shift in the industrial value creation model, away from a resource-intensive system and towards a resource-productive, predominantly circular model. This shift offers significant opportunities for an industrialized, exporting nation like Germany ��� ultimately, it entails nothing less than a recasting of the ���Made in Germany��� model. The European Union and several of its member states have already developed strategic plans for the transition to a resource-efficient economic system based on circular economy principles. Non-European countries such as China, Japan and Canada are also following the same fundamental approach. However, Germany has yet to formulate a plan of its own. The Circular Economy Initiative Deutschland (CEID) is a multi-stakeholder initiative involving over fifty institutions from science, industry and civil society that aims to lay the foundations of a plan for Germany. In its interdisciplinary, cross-sectoral working groups, some 130 experts consider how to enable and implement circular economic models, exploring potential fields of application and discussing the conditions that could facilitate successful implementation. The Circular Economy Initiative Deutschland is developing targets for the transition, with a focus on the following themes: - Circular business models and digital technologies as drivers for innovation - New value networks for batteries and packaging - Framework conditions for a circular transformation and assessment of circularity���s economic potential Between October 2019 und December 2020, the Working Group ���Packaging��� of the Circular Economy Initiative Deutschland developed a joint target picture 2030 and recommendations for action for the establishment of a Circular Economy for packaging. With a cross-value chain approach, the Working Group highlighted incentives and benefits for the recycling of packaging materials across relevant stakeholders and thereby identified options for action along the entire value chain. With the report, the members support the initiation, implementation and long-term anchoring of the Circular Economy in Germany and beyond. The 20 members of the Working Group ���Packaging��� are experts from leading academic institutions, German businesses and civil society across the entire packaging value chain. This composition allowed the group to achieve its goal of addressing the topic as holistically as possible.

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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: Abdel-Nabi, Riad;

    Effect of ethanol on amino acids and related compounds in rat plasma, heart, aorta, bronchus, and pancreas. The composition of 36 amino acids and related compounds is presented for plasma, heart, aorta, bronchus and pancreas. The distribution pattern of these biochemicals is similar but not identical among the tissues. The effect of an acute dose of ethanol (2g/kg,IP) on these amino acids and related compounds was then studied. In the plasma, alanine, arginine, aspartic acid, beta-alanine, glycine, phenylalanine, and serine are decreased. In the aorta, ammonia and taurine are decreased. In the heart, aspartic acid and leucine are decreased, and carnosine, GABA, glutamic acid, and ornithine are increased. In the pancreas, asparagine and taurine are decreased, and citrulline, cysteine, histidine and isoleucine are increased. In the bronchi, GABA, ethanolamine, histidine, taurine, and isoleucine are decreased. A number of correlations of some compounds in plasma or tissues were found but differed often between control and ethanol-treated animals. Ethanol-induced tissue changes generally do not correlate with plasma changes and are mostly specific for a given tissue. Effekte einer akuten Dosis Ethanol (2g/kg, IP) auf bestimmte Aminosäuren und verwandte Verbindungen wurden untersucht. Die Aminosäurespiegel bzw. deren Verteilung ist ähnlich, aber nicht gleich, in den verschiedenen Geweben. In den verschiedenen Geweben fanden wir teilweise erniedrigte Spiegel, teilweise aber auch erhöhte Spiegel nach Ethanol-Gabe. Diese Veränderungen bezogen sich 1. auf die einzelnen Aminosäuren oder 2. auf die unterschiedlich- en Gewebe. Eine Anzahl Korrelationen einiger Aminoverbindungen in Plasma oder Geweben wurde gefunden, waren aber oft unterschiedlich zwischen Kontroll- und Ethanolratten. Ethanol-induzierte Veränderungen in den Geweben korrelieren im Allgemeinen nicht mit den Veränderungen im Plasma und sind meistens für die untersuchten Gewebe spezifisch.

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    https://dx.doi.org/10.17192/z2...
    Doctoral thesis . 2005
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      https://dx.doi.org/10.17192/z2...
      Doctoral thesis . 2005
      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.

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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: Stock, Tim Erwin;

    Im heutigen Zeitalter des Anthropozäns stehen die Industrie-, Schwellen- und Entwicklungsländer vor vielfältigen Nachhaltigkeitsherausforderungen, die durch globale Trends im Handlungsfeld umweltbezogener, gesellschaftlicher und wirtschaftlicher Dimension menschlichen Wirkens hervorgerufen werden. Dazu zählen die steigende sozio-ökonomische Ungleichheit, der Klimawandel, die zunehmende Umweltbelastung, Urbanisierung sowie der Anstieg der Cyberabhängigkeit. Diese Trends führen in den einzelnen Ländern zu unterschiedlichen, regional ausgeprägten Risiken, wie z. B. soziale Instabilität, Unterbeschäftigung, unfreiwillige Migration, Wasserkrisen, Naturkatastrophen, Ressourcenverknappung oder Cyberattacken. Zur langfristigen Bewältigung der globalen Nachhaltigkeitsherausforderungen haben die Mitgliedsländer der Vereinten Nationen die Agenda 2030 verabschiedet. Diese umfasst 17 unteilbare und sich selbst bedingende Ziele für eine nachhaltige Entwicklung, die als Vorgabe für eine Transformation der Volkswirtschaften von einer meist rein ökonomisch geprägten hin zu einer auf Nachhaltigkeit ausgerichteten Entwicklung dienen. Zur Umsetzung der Agenda 2030 sollen insbesondere globale, nationale, regionale und lokale Anspruchsgruppen maßgeblich beitragen, indem sie zielgerichtete Handlungen zur nachhaltigen Entwicklung planen, ausführen und steuern. Start-Ups können bottom-up dazu beitragen, nachhaltige Ideen durch die Entwicklung technischer Innovationen am Markt zu etablieren. Durch die marktwirtschaftliche Dynamik von Kooperation und Wettbewerb in globalen Wertschöpfungs- und Wissensnetzwerken können technische Innovationen somit langfristig die Transformation in Richtung einer nachhaltigen Entwicklung fördern. Start-Ups müssen daher befähigt werden, eigenständig nachhaltige Innovationen systematisch zu entwickeln. Es wird dazu eine Vorgehensweise erforscht, die die integrierte Entwicklung eines technischen Produktes und zugehörigen Geschäftsmodelles als relevante Teilsysteme einer Innovation ermöglicht. Die Vorgehensweise deckt die frühere und spätere Phase der Innovationsentwicklung ab. Sie ermöglicht die einfache Suche nachhaltiger Lösungen zur Entwicklung der Innovation. Dazu werden die Werte sowie Ziele und Prinzipien einer nachhaltigen Entwicklung in die Vorgehensweise eingebunden. Die Vorgehensweise orientiert sich dabei an den besonderen Bedürfnissen von Start-Ups zur Erschließung neuer Märkte sowie zur Realisierung von Wettbewerbsvorteilen auf bestehenden Märkten. Die Implementierung und Erprobung der Vorgehensweise erfolgt exemplarisch für unterschiedliche industrielle und universitäre Start-Ups. In today's age of the Anthropocene, newly and early industrialized countries are facing a variety of sustainability challenges caused by global trends in the environmental, social, and economic dimensions of human activities, such as a growing socio-economic inequality, climate change, increasing environmental degradation, urbanization, and an increasing cyber-dependency. These global trends are leading to different regional risks, e.g. social instability, underemployment, involuntary migration, water crises, natural catastrophes, resource depletion, or cyberattacks. For coping with the challenges in the long run, the General Assembly of the United Nations adopted the Agenda 2030, which applies equally to all countries in the world. The Agenda 2030 includes 17 indivisible and self-sustaining goals. These so-called Sustainable Development Goals are intended to serve as the foundation for a transformation of the global economies towards a sustainable development. The implementation of the Agenda 2030 requires a significant contribution from global, national, regional, and local stakeholders by planning, running, and controlling activities related to a sustainable development. Bottom-up, startups can essentially contribute by expanding sustainable inventions to competitive, technological innovations. By means of the market dynamics of cooperation and competition in global value creation and knowledge networks, these sustainable innovations can foster a global sustainable development. Thus, startups must be enabled to systematically develop sustainable innovations independently. For this purpose, a procedure is being researched which enables the integrated development of a technical product and related business model as relevant subsystems of an innovation. The procedure covers the early and late phase of the innovation development. It allows the search for sustainable solutions during the development of the innovation in a simple manner. To this end, values, goals, and principles of a sustainable development are integrated. The procedure is oriented towards the special needs of startups for opening up new markets and realizing competitive advantages in existing markets. The implementation and testing of the procedure is exemplary carried out for different industrial and university startups.

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    Doctoral thesis . 2019
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    https://dx.doi.org/10.14279/de...
    Doctoral thesis . 2019
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      Doctoral thesis . 2019
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Welzholz, Anna Catrin Sara;

    Die Magen-Darm-Motilität von Patienten auf Intensivstationen unterliegt vielen hemmenden Einflüssen. Außer der Wirkung inhibitorisch wirksamer Pharmaka wäre denkbar, dass auch organische Lösungsmittel (Ethanol, DMSO), Detergentien (SLS/CAPB) und aus Perfusor- und Infusionsleitungen freigesetzte Weichmacher (Phthalate) die Dünndarmperistaltik per se beeinflussen oder die Wirkung inhibitorisch wirksamer Pharmaka (Midazolam, Fentanyl) modulieren. Die Untersuchungen wurden in vitro am Dünndarm des Meerschweinchens durchgeführt. Der Parameter zur Beurteilung der inhibitorischen Wirkung auf die Peristaltik einer dem Organbad zugegebenen Substanz war die Änderung des intraluminalen Schwellendrucks ΔPPT (peristaltic pressure threshold) zur Auslösung von Peristaltik. Ein Anstieg der PPT zeigt eine inhibitorische Wirkung an. In der Zusammenschau der Ergebnisse aller Experimente der vorliegenden Arbeit zeigte sich, dass weder DEHP, Ethanol, DMSO noch Detergentien (SLS/CAPB) per se eine konzentrationsabhängige, signifikant hemmende Wirkung auf die Dünndarmperistaltik haben. Jedoch vermochten Ethanol, sowohl extraserosal dem Organbad zugegeben als auch endoluminal durch das Dünndarmsegment perfundiert, und in Ethanol gelöstes DEHP die motilitätshemmende Wirkung von Midazolam bzw. Fentanyl zu verstärken. In den Untersuchungen fiel auf, dass die Schwellendruckänderungen ΔPPT nach Zugabe von Ethanol, unabhängig von der jeweiligen Konzentration, sehr heterogen waren. Um den Mechanismus der Ethanolwirkung genauer zu charakterisieren, wurden Darmsegmente vor der Zugabe von Ethanol mit Antagonisten bzw. Blockern vermuteter Signaltransduktionswege vorbehandelt. Eingesetzt wurden Naloxon (Antagonist an Opioidrezeptoren), Apamin (Inhibitor von calciumaktivierten small conductance Kaliumkänalen), Bicucullin (Antagonist am GABAA-Rezeptor), Lorglumid (Antagonist am Cholecystokinin CCKA-Rezeptor) und YM022 (selektiver Antagonist am Gastrin/CCKB-Rezeptor). Diese Antagonisierungsversuche ergaben keine signifikanten Ergebnisse, da Ethanol in der Konzentration mit inhibitorischer Wirkung auf die Peristaltik zu heterogene Änderungen der PPT hervorrief. Unter klinischen Gesichtspunkten könnten die hemmende Wirkung von Ethanol auf die Peristaltik sowie die Wirkungsverstärkung des motilitätshemmenden Midazolam und Fentanyl durch Ethanol bzw. in Ethanol gelöstes DEHP Faktoren sein, die zur Hemmung der Darmmotilität bei Intensivpatienten beitragen. Critically ill patients' gastro-intestinal-motility is subject to many inhibiting factors. Apart from medicaments also organic solvents (ethanol, DMSO), detergents (SLS/CAPB) and plasticizers (phthalates) which are delivered from infusion lines may influence the action of the bowels per se or modulate the effect of inhibiting pharmaceutics. The investigations were performed on guinea pigs' small intestine in vitro. The modification of the intra-luminal PPT (peristaltic pressure threshold) was measured to estimate the inhibiting effect of a substance on the peristalsis. An increasing PPT shows an inhibiting effect. Overall, neither DEHP, ethanol, DMSO nor detergents (SLS/CAPB) per se had a significant, inbiting effect on the peristalsis. However, ethanol added to the organ bath as well as added via perfusion through the gut segment aggravated the inhibitoring effect of midazolame. The same effect was observed when gut segments were perfused by DEHP solute in ethanol and fentanyl was added to the organ bath. Furthermore, the behaviour of ethanol was very heterogeneous. To characterize ethanol's mechanisms of action different gut segments were pretreated with antagonists or inhibitors of suspected signal transduction pathways. Therefore naloxone (opiod receptor antagonist), apamin (inhibitor of calcium activated small conductance sodium channels), bicucullin (GABA-A receptor antagonist), lorglumide (CCK-A receptor antagonist) and YM 022 (CCK-B receptor antagonist) were used. None of these experiments brought any significant result but also very heterogeneous alterations of the PPT. Under clinical aspects the inhibiting effects of ethanol on the peristalsis as well as the aggravation of the inhibting effects of midazolame and fentanyl by ethanol or DEHP solute in ethanol may be factors which may be conducive to the gastro intestinal atony of the critically ill patient.

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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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      https://dx.doi.org/10.18725/op...
      Doctoral thesis . 2016
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    Authors: Wittmer, Heidi; Berger, Thomas; Wittmer, Heidi; Berger, Thomas;

    The agreement on the Clean Development Mechanism as a flexible instrument of emissions reduction within the Kyoto protocol opens up new perspectives for the implementation of regenerative energy projects in developing countries. Bioenergy presently covers about one third of the total energy demand in developing countries. Especially in many rural regions it constitutes the cheapest if not the only energy source, and although numerous technologies are available for increased and improved use, their application remains limited. The present study addresses the question as to why this technical potential has not yet been taken advantage of. It investigates the socio-economic and institutional challenges of increased use of renewable energy in developing countries. Based on this analysis suggestions for energy and climate protection policies are derived. The literature dealing with dissemination of technologies supports the assumption that non-technical barriers limit an increased use of renewable energy in developing countries, especially on the demand side. The study therefore parts from a system analysis of the energy sector, in which the decisions of the energy users stand in front. As a first step of this analysis, the context of the energy supply in developing countries is investigated. The study reveals that especially economic and political/institutional barriers are widespread and similar across different countries. Contrarily, ecological and socio-cultural conditions differ strongly between applications and between countries. It can be concluded that political barriers at present still limit an increased spread of renewable energy use. However, deregulation and market liberalisation processes currently under way can, if well conceived, open up considerable new potentials. An analysis of the role of the different barriers within the general context precedes their discussion with regard to the following renewable energy sources: 1) Solid combustibles are the most important energy source, based on their present use. They have the largest potential for increased use under corresponding economic and political/institutional conditions. This is especially true for modern forms of power generation. 2) Biogas has a significant ecological potential. However, it is more complex to utilise, so that a successful implementation is conditioned by many prerequisites. 3) Biofuels (non-fossil fuels) have a large implementation potential in some countries if their use is supported and subsidised. The advantages and disadvantages of such a subsidy must be carefully considered. The importance of biofuels world-wide is restricted and their utilisation potential compared to hydrogen-based fuel appears rather limited. Poorer population groups depend on renewable energy sources in a special way. Firstly, biomass is the most important, sometimes the only, energy source in these households. Secondly, many poor households earn a substantial amount of their income through the sale of biomass for energy use. It is shown that to improve the energy supply to poorer households, an expansion of commercial energy production is needed, especially of electricity. The optimal structure of subsidies is discussed. The study concludes that only those political measures that make renewable energy sources look more attractive from the view of the energy user, can contribute to taking advantage of the technical potential for the reduction of CO2. Accordingly, recommendations are derived at three different levels: 1) General opportunities for the promotion of bioenergy such as technology development, information dissemination and improvement of education. 2) Potentials at the national policy level, especially for enhancing the supply of modern energy carriers based on biomass. 3) Recommendations for the design of projects in the energy sector.

    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/ bonndoc - The Reposi...arrow_drop_down
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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/
    EconStor
    Research . 2002
    Data sources: EconStor
    https://dx.doi.org/10.22004/ag...
    Other literature type . 2002
    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/ bonndoc - The Reposi...arrow_drop_down
      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/
      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/
      EconStor
      Research . 2002
      Data sources: EconStor
      https://dx.doi.org/10.22004/ag...
      Other literature type . 2002
      Data sources: Datacite
      addClaim

      This Research product is the result of merged Research products in OpenAIRE.

      You have already added works in your ORCID record related to the merged Research product.
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