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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A Novel Pathway for Hormonally Active Calcitriol

Lehmann, Bodo, Knuschke, Peter, Meurer, Michael 20 February 2014 (has links) (PDF)
Calcitriol [1α,25(OH)2D3], the hormonally active form of vitamin D3 (D3) is produced in both renal and extrarenal tissues. Our findings demonstrate that physiological doses of UVB radiation at 300 nm induce the conversion of 7-dehydrocholesterol (7-DHC) via preD3 and D3 into calcitriol in the pmol range in epidermal keratinocytes. The hydroxylation of photosynthesized D3 to calcitriol is strongly suppressed by ketoconazole, a known inhibitor of cytochrome P450 mixed function oxidases. The UVB-induced formation of calcitriol in human skin is demonstrable in vivo by the microdialysis technique. These results suggest that human skin is an autonomous source of hormonally active calcitriol. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
2

A Novel Pathway for Hormonally Active Calcitriol

Lehmann, Bodo, Knuschke, Peter, Meurer, Michael January 2000 (has links)
Calcitriol [1α,25(OH)2D3], the hormonally active form of vitamin D3 (D3) is produced in both renal and extrarenal tissues. Our findings demonstrate that physiological doses of UVB radiation at 300 nm induce the conversion of 7-dehydrocholesterol (7-DHC) via preD3 and D3 into calcitriol in the pmol range in epidermal keratinocytes. The hydroxylation of photosynthesized D3 to calcitriol is strongly suppressed by ketoconazole, a known inhibitor of cytochrome P450 mixed function oxidases. The UVB-induced formation of calcitriol in human skin is demonstrable in vivo by the microdialysis technique. These results suggest that human skin is an autonomous source of hormonally active calcitriol. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
3

Examination of invisible injuries: UV-induced fluorescence as a supplement to physical examination for blunt trauma injury

Glauche, Julius 09 November 2017 (has links)
Die Untersuchung von Gewaltopfern und die Dokumentation von Verletzungen gehört zur Routinetätigkeit in der Klinischen Rechtsmedizin. Am häufigsten werden Folgen stumpfer Gewalteinwirkung festgestellt. Diese Untersuchungen geraten an ihre Grenzen, wenn z.B. Hautunterblutungen (noch) nicht oder bereits nicht mehr sichtbar sind. Die vorliegende Arbeit belegt den Nutzen von ultravioletter (UV) Strahlung zur Sichtbarmachung verblasster und mit bloßem Auge nicht erkennbare Hämatome. Die durch UV-Strahlung hervorgerufene Fluoreszenz von gesundem im Vergleich zu geschädigtem Gewebe kann teils noch bis zu Monate nach einer Verletzung Unterschiede aufweisen. Somit stellt das hier untersuchte Verfahren eine kostengünstige, schnelle und zuverlässige Alternative des Methodenspektrums rechtsmedizinischer Untersuchungstechniken dar.:1. Bibliographische Beschreibung 2. Introduction 3. Background 3.1. Hematoma 3.2. Electromagnetic radiation 3.3. Fluorescence 3.4. UV radiation 3.5. UV-induced fluorescence 3.6. Hematoma fluorescence 3.7. UV-photography 3.8. Alternative non-invasive 4. Motivation & Purpose of this Thesis 5. Publication 6. Summary & Conclusion 6.1. Background 6.2. Aim 6.3. Material and Method 6.4. Results 6.5. Thesis 6.6. Conclusion 7. Appendix 7.1. Bibliography 7.2. Core Data 7.3. Declaration of Independence 7.4. Curriculum vitae 7.5. Publications 7.6. Acknowledgements / Identification and age determination of hematomas is daily work in forensic medicine. Following blunt trauma, a hematoma may be visible between a few hours and up to three weeks. Patients presenting their injuries outside of that timeframe usually miss visual signs. Various studies indicate that ultraviolet radiation (UVR) can aid the process of hematoma identification, when visible signs are vague or even absent. In this thesis hematoma identification using UV- induced fluorescence is discussed as simple, economic and convenient method.:1. Bibliographische Beschreibung 2. Introduction 3. Background 3.1. Hematoma 3.2. Electromagnetic radiation 3.3. Fluorescence 3.4. UV radiation 3.5. UV-induced fluorescence 3.6. Hematoma fluorescence 3.7. UV-photography 3.8. Alternative non-invasive 4. Motivation & Purpose of this Thesis 5. Publication 6. Summary & Conclusion 6.1. Background 6.2. Aim 6.3. Material and Method 6.4. Results 6.5. Thesis 6.6. Conclusion 7. Appendix 7.1. Bibliography 7.2. Core Data 7.3. Declaration of Independence 7.4. Curriculum vitae 7.5. Publications 7.6. Acknowledgements

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