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description Publication2021 Austria GermanAuthors: Weichsel, Alexander Josef;Weichsel, Alexander Josef;Die Baubranche befindet sich mitten in der digitalen Transformation. Allerdings liegt diese im direkten Vergleich mit anderen Branchen immer noch zurück. In der vorliegenden Masterarbeit soll erörtert werden, welche Chancen und Risiken die Digitalisierung von Verwaltungs- und Managementprozessen in einem Bauunternehmen bietet und wie sich die Digitalisierung auf die Organisation selbst auswirkt. Des Weiteren wird der Frage nachgegangen, wie der Weg zur Digitalisierung bzw. Automatisierung eines Prozesses aussieht. Um die Forschungsfragen zu beantworten, wurde eine qualitative Forschungsmethode gewählt, in der der bereits digitalisierte Eingangsrechnungsprozess im Detail analysiert und mit dem analogen Prozess verglichen wird. Dies wurde konkret durch die Kooperation mit dem Bauunternehmen Handler ermöglicht, auf dessen Initiative hin die vorliegende Arbeit ausgeschrieben wurde. Aus der Analyse des ausgewählten Prozesses geht hervor, dass in der Digitalisierung diverse Chancen liegen. Es konnten knapp zwei Drittel der ursprünglichen Prozessdauer eingespart werden. Auch in Sachen Informationsaustausch und Transparenz gab es klare Verbesserungen. Darüber hinaus profitieren auch andere Prozesse, welche mit dem ausgewählten Prozess in Verbindung stehen, durch die digitale Unterstützung. Bei schnell wachsenden Bauunternehmen bietet sich die Digitalisierung der Verwaltungs- und Managementprozesse an, um schneller fundierte Geschäftsentscheidungen treffen zu können sowie das Wachstum der Kernprozesse nicht zu behindern. The construction industry is in the middle of a digital transformation. However, in direct comparison with other industries it is still behind. The aim of this thesis is to discuss which opportunities and risks the digitalization of administrative and management processes in a construction company offers and how digitalization affects the organization itself. Furthermore, this thesis investigates the question of what the path to digitalization or automation of a process looks like. In order to answer the research questions, a qualitative research method was chosen in which an already digitized process is analyzed in detail. This is specifically made possible through the cooperation with the construction company Handler, on whose initiative this thesis was initiated. The analysis of the selected process shows that there are various opportunities in digitalization. Almost two thirds of the original process time could be saved. There are also clear improvements in terms of information exchange and transparency. Furthermore, other processes that are connected also benefit from the digital support. For fast-growing construction companies, the digitalization of administrative and management processes is an option in order to be able to make well-founded business decisions faster and not to aggravate the growth of core processes. Abweichender Titel laut Übersetzung der Verfasserin/des Verfassers Masterarbeit Wien, FH Campus Wien 2021
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 2015 Germany GermanJustus-Liebig-Universität Gießen Authors: Kirschner, Stefanie;Kirschner, Stefanie;Industrielle Röntgendurchleuchtungsgeräte lassen sich für die Untersuchung verschiedenster Fragestellungen anwenden. Das Spektrum der Anwendbarkeit reicht von der hochauflösenden in vivo-Bildgebung von z. B. Glioblastomen, zerebralen Hirngefäßen, abdominellen und thorakalen Organen in der Maus, bis hin zur hoch-auflösenden Untersuchung von Objekten wie z. B. Stents, Zähnen, Insekten oder auch einzelner Organe ex vivo. Desweitern zeichnet das hier eingesetzte industrielle Röntgengerät die Möglichkeit zur Strahlentherapie von Tieren aus, was mit herkömmlichen speziellen Kleintier-Computertomographen nicht möglich ist. Ziel dieser Dissertation war zum einen die Etablierung eines Glioblastom-Maus-Modells und anschließend die Überprüfung der Anwendbarkeit eines Mikro-CT für die wiederholte bildgebende Darstellung der Hirntumoren vor und nach Strahlentherapie. Darüber hinaus wurde die Mikro-CT für die Evaluierung sowohl der Verschlussrate von Aneurysmen als auch der artefaktfreien Darstellung der verwendeten Materialien im Modellversuch getestet. Wir konnten in beiden von uns durchgeführten Studien die Mikro-CT erfolgreich zur Bildgebung anwenden. Zur Etablierung des Glioblastom-Maus-Modells wurde die gesamte OP-Methode zur Tumorzellimplantation in das Gehirn zunächst an toten Mäusen durchgeführt. Anstatt Zellen wurde eine äquivalente Menge an mit Kontrastmittel vermengter Methylcellulose des später geplanten Injektionsvolumens an Zellen in das Gehirn appliziert. Anschließend wurde zur Erfolgskontrolle eine Röntgenaufnahme im Mikro-CT angefertigt. Anhand der Aufnahmen konnten wir die genaue Lokalisation und Ausdehnung der applizierten Menge beurteilen und unsere OP-Methode gegebenenfalls optimieren. Erst nach verlässlicher Reproduzierbarkeit der OP wurden humane Zellen in vivo in die rechte Hemisphäre von insgesamt 27 NOD/SCID/yc-/- Mäusen injiziert. Zwei Wochen nach Xenotransplantation erfolgte eine erste kontrasmittelgestützte Untersuchung im Mikro-CT zur Tumordetektion. Bei negativem Befund wurde bei den Tieren wöchentlich eine weitere Mikro-CT durchgeführt. Tiere mit positivem Befund wurden je nach geplantem Versuch nicht therapiert (n=21) oder mittels Strahlentherapie (n=6) behandelt. Alle Tiere wurden im weiteren Verlauf wöchentlich bis zum Versuchsende im Mikro-CT untersucht. Insgesamt wurden 103 kontrastmittelgestützte Untersuchungen im Mikro-CT durchgeführt. Der maximale Tumordurchmesser und das maximale Tumorvolumen wurden anhand der einzelnen CT-Datensätze bestimmt. Zusätzlich wurden die Gehirne histologisch aufgearbeitet um das maximale Volumen und den maximalen Durchmesser der Tumore anhand der Histologie zu berechnen. Die histologischen Ergebnisse wurden mit der jeweils letzten Mikro-CT (durchgeführt am Tag des Versuchsendes) verglichen. Die hervorragende Korrelation von maximalem Tumordurchmesser und Tumorvolumen ermittelt in der Mikro-CT mit den Ergebnissen aus der Histologie (Tumordurchmesser: 0,929, p < 0,001; Tumorvolumen: 0969, p < 0,001, n = 17) belegt die hohe Genauigkeit und damit Anwendbarkeit der Mikro-CT für ein Hirntumormodell. Die hohe Sensitivität (0,95) und Spezifität (0,71) belegen zusätzlich die Exaktheit der Mikro-CT zur Erkennung von Gehirntumoren in sehr kleinen Tieren wie Mäusen (PPV=0,91, NPV=0,83). Die zweite im Rahmen dieser kumulativen Dissertation eingereichte Arbeit befasst sich mit der Evaluation einer neuen Methode zur Embolisation von Aneurysmen. Hierzu wurden Aneurysmen mit einem dicht gewobenem Stent (sog. Flow diverter) überdeckt. Über einen zuvor im Aneurysma platzierten Mikrokatheter wurde das Aneurysma mit Mikropartikeln embolisiert, welche größer als die Maschen des flussmodulierenden Stents sind. Die Mikro-CT konnten wir erfolgreich einsetzen, um mit einer hohen Auflösung die 700–900 µm kleinen Partikel im Aneurysma darzustellen und die komplette Ausfüllung des Aneurysmas zu verifizieren. Auch die Maschendichte des Stents im Verhältnis zum Aneurysma konnte mittels Mikro-CT analysiert werden. Die Möglichkeit der wiederholten Darstellbarkeit von Gehirntumoren im zeitlichen Verlauf mittels Mikro-CT bietet eine Grundlage für weitere Versuchsvorhaben, wie z. B. die Visualisierung morphologischer Veränderungen des Tumors unter verschiedenen Therapieansätzen. Die erfolgreiche Evaluation der Verschlussrate von Aneurysmen mittels einer neuen Technik in der Mikro-CT ist ein wesentlicher Schritt, bevor es zu einer ersten Anwendung im lebenden Tier kommt. Beide hier vorgestellten Arbeiten tragen durch den erfolgreichen Einsatz eines bildgebenden Verfahrens erheblich zur langfristigen Senkung der Versuchstierzahlen bei. Zusammenfassend konnten wir durch die erfolgreiche Anwendung der Mikro-CT in den hier vorgestellten Arbeiten das Spektrum der Anwendbarkeit eines industriellen Mikro-CTs in der präklinischen Forschung deutlich erweitern. Micro-CT systems are being used with increasing frequency in preclinical research. The range of examinations includes high-resolution in vivo imaging of glioblastoma, cerebral vessels, abdominal and thoracic organs in mice as well as investigation of other small objects like stents, teeth, insects or single organs ex vivo or in vitro. In addition, micro-CT may be used for radiation therapy of small rodents like mice and rats, as shown in our studies. Aim of this thesis was to establish an orthotopic glioblastoma mouse model and to evaluate the applicability of a micro-CT for repetetive imaging of brain tumors in mice. We furthermore used a micro-CT to evaluate the distribution of microspheres used to treat a silicone aneurysm model. The glioblastoma mouse model was trained in dead mice first. Instead of tumor cells we first injected methylcellulose mixed with contrast agent to train intracerebral injections. The use of contrast agent allowed us to verify our injection technique by subsequent micro-CT. After successfully establishing the technique, human brain tumor cells were in injected into the right hemisphere of n = 27 NOD/SCID/yc-/- mice. Two weeks after xenotransplantation mice underwent first contrast-enhanced micro-CT. Animals with negative results in micro-CT received additional micro-CT scans weekly until brain tumors were detected. Animals were left untreated (control group), or were treated with radiation- or chemotherapy. During treatment all animals received weekly micro-CT scans until animals had to be sacrificed. The maximum diameter and volume of intracerebrally growing xenografts were measured. Brains of sacrificed mice were histologically worked up and maximum tumor diameter and tumor volume were measured again. Results from histology were compared to micro-CT data. The excellent correlation between maximum tumor diameter and tumor volume measured in micro-CT and histology (tumor diameter: 0.929, p < 0.001; tumor volume: 0.969, p < 0.001, n=17). Sensitivity and specificity of micro-CT were 0.95 and 0.71, respectively (PPV=0.91, NPV=0.83). This proved the high accurary of micro-CT for brain tumor detection in animals as small as mice. The second paper referenced to within this doctoral thesis describes the evaluation of the distribution of microspheres within a silicon aneurysm and the degree of aneurysm occlusion. For this purpose a silicon aneurysm was treated with a densely woven stent (a so called flow diverter). Additionally, the aneurysm was embolized with microspheres larger than the pores of the stent via a microcatheter previously placed in the aneurysm. Using our micro-CT we were able to visualize the 700-900 µm small microspheres, which allowed us to verify complete embolization of the aneurysm. Furthermore, the mesh density of the flow diverter in relation to the size of the microspheres was analyzed using the micro-CT. From our findings we conclude, that micro-CT is a versatile tool that may be used for imaging of a vast range of objects and thus propose that micro-CT will be used with increasing frequency in preclinical research.
Giessener Elektronis... arrow_drop_down Giessener Elektronische BibliothekDoctoral thesis . 2015Data sources: Giessener Elektronische BibliothekAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______478::daabbf0fea3990d987389867b48618de&type=result"></script>'); --> </script>
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more_vert Giessener Elektronis... arrow_drop_down Giessener Elektronische BibliothekDoctoral thesis . 2015Data sources: Giessener Elektronische BibliothekAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______478::daabbf0fea3990d987389867b48618de&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 1929Embargo end date: 01 Jan 1929 Switzerland GermanETH Zurich Authors: Leppik, Elmar Emil;Leppik, Elmar Emil;handle: 20.500.11850/134518
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Part of book or chapter of book 2017 GermanWaxmann Authors: Tillmann, Alexander; Niemeyer, Jana; Krömker, Detlef;Tillmann, Alexander; Niemeyer, Jana; Krömker, Detlef;doi: 10.25656/01:16141
Vorlesungsaufzeichnungen (eLectures) stellen an vielen Hochschulen ein wesentliches Element im Rahmen von Digitalisierungsstrategien dar. Mit der Bereitstellung von eLectures und weiteren digitalen Materialien zu Veranstaltungen sowie technologiebasierten Kommunikationsmöglichkeiten reagieren die Hochschulen auf heterogene Voraussetzungen der Studierende und strukturell und individuell unterschiedliche Lebensanforderungen und -weisen, um möglichst vielen ein erfolgreiches Studium zu ermöglichen. Durch eine Diversifizierung der universitären Lernangebote erhöht sich die Wahrscheinlichkeit, die unterschiedlichen Lernvoraussetzungen der Studierenden zu treffen. Abhängig von ihren Erfahrungen, Interessen, Lernvorlieben, Lebensumständen usw. nutzen Studierende Lernangebote auf unterschiedliche Art und Weise. Im vorliegenden Beitrag analysieren wir im Rahmen einer empirischen Studie mit 827 Studierenden den Einfluss von Vorerfahrungen zum Lernen mit videobasierten Materialien und den Einfluss von Persönlichkeitsmerkmalen auf die Nutzung von eLectures und identifizieren unterschiedliche Nutzungstypen, -präferenzen und -gewohnheiten. (DIPF/Orig.)
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1979 GermanW, Schunk; K, Reinhardt; K, Huke; R, Schmidt; L, Koch; W, Kasner;add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publication1927 Netherlands GermanDistinct zones of growth were usually only found in tropical deciduous trees with a periodically resting cambium. Reversedly a periodically resting cambium proved not to produce always distinct zones. All possible combinations of cambial activity and the formation of zones were shown to occur in the tropics. The zones could be distinguished in cross-sections by a) radial compression of the fibres formed before the new burst of cambial activity, b) a thin circular layer of parenchyma, c) a thin layer of libriform fibres, d) alternating widths of layers of libriform fibres and parenchyma, e) layers alternating in vessel diameter or arrangement. Most species formed either marked zones in east and west Java or less marked or irregular zones in the more even climate of west Java. Only a few species formed no growth zones at all in the more even climate.Young trees often did not form growth zones or only temporary ones, so that the zones were not a direct indication of age. Imported evergreen trees (except leafy trees with individually flushing branches) from cooler climates had no zones or vague ones. Renewed growth in leafy trees was always induced by substances or stimuli conducted from the sprouting leaf buds (and later from leaves) or from flowers (in leafless trees).
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1976 Germanadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 1957Embargo end date: 01 Jan 1957 Switzerland GermanETH Zurich Authors: Dettwiler, Emanuel;Dettwiler, Emanuel;handle: 20.500.11850/132934
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2013 Germanadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 2004 GermanRöFo - Fortschritte ... arrow_drop_down RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden VerfahrenOther literature type . 2004Data sources: Europe PubMed Centraladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert RöFo - Fortschritte ... arrow_drop_down RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden VerfahrenOther literature type . 2004Data sources: Europe PubMed Centraladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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description Publication2021 Austria GermanAuthors: Weichsel, Alexander Josef;Weichsel, Alexander Josef;Die Baubranche befindet sich mitten in der digitalen Transformation. Allerdings liegt diese im direkten Vergleich mit anderen Branchen immer noch zurück. In der vorliegenden Masterarbeit soll erörtert werden, welche Chancen und Risiken die Digitalisierung von Verwaltungs- und Managementprozessen in einem Bauunternehmen bietet und wie sich die Digitalisierung auf die Organisation selbst auswirkt. Des Weiteren wird der Frage nachgegangen, wie der Weg zur Digitalisierung bzw. Automatisierung eines Prozesses aussieht. Um die Forschungsfragen zu beantworten, wurde eine qualitative Forschungsmethode gewählt, in der der bereits digitalisierte Eingangsrechnungsprozess im Detail analysiert und mit dem analogen Prozess verglichen wird. Dies wurde konkret durch die Kooperation mit dem Bauunternehmen Handler ermöglicht, auf dessen Initiative hin die vorliegende Arbeit ausgeschrieben wurde. Aus der Analyse des ausgewählten Prozesses geht hervor, dass in der Digitalisierung diverse Chancen liegen. Es konnten knapp zwei Drittel der ursprünglichen Prozessdauer eingespart werden. Auch in Sachen Informationsaustausch und Transparenz gab es klare Verbesserungen. Darüber hinaus profitieren auch andere Prozesse, welche mit dem ausgewählten Prozess in Verbindung stehen, durch die digitale Unterstützung. Bei schnell wachsenden Bauunternehmen bietet sich die Digitalisierung der Verwaltungs- und Managementprozesse an, um schneller fundierte Geschäftsentscheidungen treffen zu können sowie das Wachstum der Kernprozesse nicht zu behindern. The construction industry is in the middle of a digital transformation. However, in direct comparison with other industries it is still behind. The aim of this thesis is to discuss which opportunities and risks the digitalization of administrative and management processes in a construction company offers and how digitalization affects the organization itself. Furthermore, this thesis investigates the question of what the path to digitalization or automation of a process looks like. In order to answer the research questions, a qualitative research method was chosen in which an already digitized process is analyzed in detail. This is specifically made possible through the cooperation with the construction company Handler, on whose initiative this thesis was initiated. The analysis of the selected process shows that there are various opportunities in digitalization. Almost two thirds of the original process time could be saved. There are also clear improvements in terms of information exchange and transparency. Furthermore, other processes that are connected also benefit from the digital support. For fast-growing construction companies, the digitalization of administrative and management processes is an option in order to be able to make well-founded business decisions faster and not to aggravate the growth of core processes. Abweichender Titel laut Übersetzung der Verfasserin/des Verfassers Masterarbeit Wien, FH Campus Wien 2021
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 2015 Germany GermanJustus-Liebig-Universität Gießen Authors: Kirschner, Stefanie;Kirschner, Stefanie;Industrielle Röntgendurchleuchtungsgeräte lassen sich für die Untersuchung verschiedenster Fragestellungen anwenden. Das Spektrum der Anwendbarkeit reicht von der hochauflösenden in vivo-Bildgebung von z. B. Glioblastomen, zerebralen Hirngefäßen, abdominellen und thorakalen Organen in der Maus, bis hin zur hoch-auflösenden Untersuchung von Objekten wie z. B. Stents, Zähnen, Insekten oder auch einzelner Organe ex vivo. Desweitern zeichnet das hier eingesetzte industrielle Röntgengerät die Möglichkeit zur Strahlentherapie von Tieren aus, was mit herkömmlichen speziellen Kleintier-Computertomographen nicht möglich ist. Ziel dieser Dissertation war zum einen die Etablierung eines Glioblastom-Maus-Modells und anschließend die Überprüfung der Anwendbarkeit eines Mikro-CT für die wiederholte bildgebende Darstellung der Hirntumoren vor und nach Strahlentherapie. Darüber hinaus wurde die Mikro-CT für die Evaluierung sowohl der Verschlussrate von Aneurysmen als auch der artefaktfreien Darstellung der verwendeten Materialien im Modellversuch getestet. Wir konnten in beiden von uns durchgeführten Studien die Mikro-CT erfolgreich zur Bildgebung anwenden. Zur Etablierung des Glioblastom-Maus-Modells wurde die gesamte OP-Methode zur Tumorzellimplantation in das Gehirn zunächst an toten Mäusen durchgeführt. Anstatt Zellen wurde eine äquivalente Menge an mit Kontrastmittel vermengter Methylcellulose des später geplanten Injektionsvolumens an Zellen in das Gehirn appliziert. Anschließend wurde zur Erfolgskontrolle eine Röntgenaufnahme im Mikro-CT angefertigt. Anhand der Aufnahmen konnten wir die genaue Lokalisation und Ausdehnung der applizierten Menge beurteilen und unsere OP-Methode gegebenenfalls optimieren. Erst nach verlässlicher Reproduzierbarkeit der OP wurden humane Zellen in vivo in die rechte Hemisphäre von insgesamt 27 NOD/SCID/yc-/- Mäusen injiziert. Zwei Wochen nach Xenotransplantation erfolgte eine erste kontrasmittelgestützte Untersuchung im Mikro-CT zur Tumordetektion. Bei negativem Befund wurde bei den Tieren wöchentlich eine weitere Mikro-CT durchgeführt. Tiere mit positivem Befund wurden je nach geplantem Versuch nicht therapiert (n=21) oder mittels Strahlentherapie (n=6) behandelt. Alle Tiere wurden im weiteren Verlauf wöchentlich bis zum Versuchsende im Mikro-CT untersucht. Insgesamt wurden 103 kontrastmittelgestützte Untersuchungen im Mikro-CT durchgeführt. Der maximale Tumordurchmesser und das maximale Tumorvolumen wurden anhand der einzelnen CT-Datensätze bestimmt. Zusätzlich wurden die Gehirne histologisch aufgearbeitet um das maximale Volumen und den maximalen Durchmesser der Tumore anhand der Histologie zu berechnen. Die histologischen Ergebnisse wurden mit der jeweils letzten Mikro-CT (durchgeführt am Tag des Versuchsendes) verglichen. Die hervorragende Korrelation von maximalem Tumordurchmesser und Tumorvolumen ermittelt in der Mikro-CT mit den Ergebnissen aus der Histologie (Tumordurchmesser: 0,929, p < 0,001; Tumorvolumen: 0969, p < 0,001, n = 17) belegt die hohe Genauigkeit und damit Anwendbarkeit der Mikro-CT für ein Hirntumormodell. Die hohe Sensitivität (0,95) und Spezifität (0,71) belegen zusätzlich die Exaktheit der Mikro-CT zur Erkennung von Gehirntumoren in sehr kleinen Tieren wie Mäusen (PPV=0,91, NPV=0,83). Die zweite im Rahmen dieser kumulativen Dissertation eingereichte Arbeit befasst sich mit der Evaluation einer neuen Methode zur Embolisation von Aneurysmen. Hierzu wurden Aneurysmen mit einem dicht gewobenem Stent (sog. Flow diverter) überdeckt. Über einen zuvor im Aneurysma platzierten Mikrokatheter wurde das Aneurysma mit Mikropartikeln embolisiert, welche größer als die Maschen des flussmodulierenden Stents sind. Die Mikro-CT konnten wir erfolgreich einsetzen, um mit einer hohen Auflösung die 700–900 µm kleinen Partikel im Aneurysma darzustellen und die komplette Ausfüllung des Aneurysmas zu verifizieren. Auch die Maschendichte des Stents im Verhältnis zum Aneurysma konnte mittels Mikro-CT analysiert werden. Die Möglichkeit der wiederholten Darstellbarkeit von Gehirntumoren im zeitlichen Verlauf mittels Mikro-CT bietet eine Grundlage für weitere Versuchsvorhaben, wie z. B. die Visualisierung morphologischer Veränderungen des Tumors unter verschiedenen Therapieansätzen. Die erfolgreiche Evaluation der Verschlussrate von Aneurysmen mittels einer neuen Technik in der Mikro-CT ist ein wesentlicher Schritt, bevor es zu einer ersten Anwendung im lebenden Tier kommt. Beide hier vorgestellten Arbeiten tragen durch den erfolgreichen Einsatz eines bildgebenden Verfahrens erheblich zur langfristigen Senkung der Versuchstierzahlen bei. Zusammenfassend konnten wir durch die erfolgreiche Anwendung der Mikro-CT in den hier vorgestellten Arbeiten das Spektrum der Anwendbarkeit eines industriellen Mikro-CTs in der präklinischen Forschung deutlich erweitern. Micro-CT systems are being used with increasing frequency in preclinical research. The range of examinations includes high-resolution in vivo imaging of glioblastoma, cerebral vessels, abdominal and thoracic organs in mice as well as investigation of other small objects like stents, teeth, insects or single organs ex vivo or in vitro. In addition, micro-CT may be used for radiation therapy of small rodents like mice and rats, as shown in our studies. Aim of this thesis was to establish an orthotopic glioblastoma mouse model and to evaluate the applicability of a micro-CT for repetetive imaging of brain tumors in mice. We furthermore used a micro-CT to evaluate the distribution of microspheres used to treat a silicone aneurysm model. The glioblastoma mouse model was trained in dead mice first. Instead of tumor cells we first injected methylcellulose mixed with contrast agent to train intracerebral injections. The use of contrast agent allowed us to verify our injection technique by subsequent micro-CT. After successfully establishing the technique, human brain tumor cells were in injected into the right hemisphere of n = 27 NOD/SCID/yc-/- mice. Two weeks after xenotransplantation mice underwent first contrast-enhanced micro-CT. Animals with negative results in micro-CT received additional micro-CT scans weekly until brain tumors were detected. Animals were left untreated (control group), or were treated with radiation- or chemotherapy. During treatment all animals received weekly micro-CT scans until animals had to be sacrificed. The maximum diameter and volume of intracerebrally growing xenografts were measured. Brains of sacrificed mice were histologically worked up and maximum tumor diameter and tumor volume were measured again. Results from histology were compared to micro-CT data. The excellent correlation between maximum tumor diameter and tumor volume measured in micro-CT and histology (tumor diameter: 0.929, p < 0.001; tumor volume: 0.969, p < 0.001, n=17). Sensitivity and specificity of micro-CT were 0.95 and 0.71, respectively (PPV=0.91, NPV=0.83). This proved the high accurary of micro-CT for brain tumor detection in animals as small as mice. The second paper referenced to within this doctoral thesis describes the evaluation of the distribution of microspheres within a silicon aneurysm and the degree of aneurysm occlusion. For this purpose a silicon aneurysm was treated with a densely woven stent (a so called flow diverter). Additionally, the aneurysm was embolized with microspheres larger than the pores of the stent via a microcatheter previously placed in the aneurysm. Using our micro-CT we were able to visualize the 700-900 µm small microspheres, which allowed us to verify complete embolization of the aneurysm. Furthermore, the mesh density of the flow diverter in relation to the size of the microspheres was analyzed using the micro-CT. From our findings we conclude, that micro-CT is a versatile tool that may be used for imaging of a vast range of objects and thus propose that micro-CT will be used with increasing frequency in preclinical research.
Giessener Elektronis... arrow_drop_down Giessener Elektronische BibliothekDoctoral thesis . 2015Data sources: Giessener Elektronische BibliothekAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______478::daabbf0fea3990d987389867b48618de&type=result"></script>'); --> </script>
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 1929Embargo end date: 01 Jan 1929 Switzerland GermanETH Zurich Authors: Leppik, Elmar Emil;Leppik, Elmar Emil;handle: 20.500.11850/134518
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Part of book or chapter of book 2017 GermanWaxmann Authors: Tillmann, Alexander; Niemeyer, Jana; Krömker, Detlef;Tillmann, Alexander; Niemeyer, Jana; Krömker, Detlef;doi: 10.25656/01:16141
Vorlesungsaufzeichnungen (eLectures) stellen an vielen Hochschulen ein wesentliches Element im Rahmen von Digitalisierungsstrategien dar. Mit der Bereitstellung von eLectures und weiteren digitalen Materialien zu Veranstaltungen sowie technologiebasierten Kommunikationsmöglichkeiten reagieren die Hochschulen auf heterogene Voraussetzungen der Studierende und strukturell und individuell unterschiedliche Lebensanforderungen und -weisen, um möglichst vielen ein erfolgreiches Studium zu ermöglichen. Durch eine Diversifizierung der universitären Lernangebote erhöht sich die Wahrscheinlichkeit, die unterschiedlichen Lernvoraussetzungen der Studierenden zu treffen. Abhängig von ihren Erfahrungen, Interessen, Lernvorlieben, Lebensumständen usw. nutzen Studierende Lernangebote auf unterschiedliche Art und Weise. Im vorliegenden Beitrag analysieren wir im Rahmen einer empirischen Studie mit 827 Studierenden den Einfluss von Vorerfahrungen zum Lernen mit videobasierten Materialien und den Einfluss von Persönlichkeitsmerkmalen auf die Nutzung von eLectures und identifizieren unterschiedliche Nutzungstypen, -präferenzen und -gewohnheiten. (DIPF/Orig.)
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1979 GermanW, Schunk; K, Reinhardt; K, Huke; R, Schmidt; L, Koch; W, Kasner;add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publication1927 Netherlands GermanDistinct zones of growth were usually only found in tropical deciduous trees with a periodically resting cambium. Reversedly a periodically resting cambium proved not to produce always distinct zones. All possible combinations of cambial activity and the formation of zones were shown to occur in the tropics. The zones could be distinguished in cross-sections by a) radial compression of the fibres formed before the new burst of cambial activity, b) a thin circular layer of parenchyma, c) a thin layer of libriform fibres, d) alternating widths of layers of libriform fibres and parenchyma, e) layers alternating in vessel diameter or arrangement. Most species formed either marked zones in east and west Java or less marked or irregular zones in the more even climate of west Java. Only a few species formed no growth zones at all in the more even climate.Young trees often did not form growth zones or only temporary ones, so that the zones were not a direct indication of age. Imported evergreen trees (except leafy trees with individually flushing branches) from cooler climates had no zones or vague ones. Renewed growth in leafy trees was always induced by substances or stimuli conducted from the sprouting leaf buds (and later from leaves) or from flowers (in leafless trees).
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1976 Germanadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 1957Embargo end date: 01 Jan 1957 Switzerland GermanETH Zurich Authors: Dettwiler, Emanuel;Dettwiler, Emanuel;handle: 20.500.11850/132934
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2013 Germanadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 2004 GermanRöFo - Fortschritte ... arrow_drop_down RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden VerfahrenOther literature type . 2004Data sources: Europe PubMed Centraladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert RöFo - Fortschritte ... arrow_drop_down RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden VerfahrenOther literature type . 2004Data sources: Europe PubMed Centraladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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