University ErlangenNurnberg


University ErlangenNurnberg

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Schorsch S.,University ErlangenNurnberg | Schorsch S.,ETH Zurich | Kiefer J.,University ErlangenNurnberg | Kiefer J.,University of Aberdeen | And 3 more authors.
Applied Spectroscopy | Year: 2010

Lasers are common tools in the field of combustion diagnostics. In some respects, however, they have disadvantages. Therefore, there is a need for new light sources delivering radiation in the required wavelength regions with high stability and reliability at low cost. Light-emitting diodes (LED) in the near- and mid-infrared spectral region have proven their potential for spectroscopic applications in the past. In the present work we demonstrate the feasibility of using ultraviolet LEDs for flame diagnostics. For this purpose, OH and CH radicals are detected in premixed methane/ air flames. The LED emission is found to be stable after thermal equilibrium is reached. This was the case after a warming-up period in the order of minutes. The spectral characteristics were stable during a 24-h test. ©2010 Society for Applied Spectroscopy.

Calabrese S.,Innere Medizin | Wenkel H.,Praxis Dr. Wenkel und Partner | Rummelt C.,University ErlangenNurnberg | Kruse F.,University ErlangenNurnberg | Cursiefen C.,University ErlangenNurnberg
Klinische Monatsblatter fur Augenheilkunde | Year: 2010

Background: This retrospective study examines the histopathological changes, especially the occurrence of retrocorneal membranes, in irreversible graft failure after penetrating keratoplasty. Patients/Materials and Methods: 371 corneas of 308 patients were examined. The examination was carried out using a light microscope. Results: 45 % of the corneas (167 / 371) showed aretrocorneal membrane with a thickness of 2 520 micrometers. Re-endothelialisation was detected in 75 cases. In 74 % (124 / 167) cellular infiltration into the stroma could be observed. In 32 % (119 / 371) the graft-host border was visible. Conclusions: Retrocorneal membranes are a frequent finding in irreversible graft failure after penetrating keratoplasty. Aetiologically the graft-host border as well as the formation of connective tissue seem to play a key role. © Georg Thieme Verlag KG Stuttgart - New York.

Zwerina J.,University ErlangenNurnberg | Dallos T.,University ErlangenNurnberg
Orthopade | Year: 2010

Primary osteoarthritis (OA) of peripheral joints is a common disease mainly occurring after the age of 50. It is important to distinguish primary from secondary OA. Younger age at disease onset, rapid progression, unusual disease manifestations and co-morbidities are signs of secondary OA. This review outlines an important group of secondary OA. Hereditary metabolic diseases can exhibit joint involvement. For some of these diseases, correct diagnosis is critical, since appropriate therapy influences not only joint function and quality of life, but can also prevent relevant end-organ damage. © 2010 Springer-Verlag.

Schmidt N.,University ErlangenNurnberg | Scheurer A.,Friedrich - Alexander - University, Erlangen - Nuremberg | Sperner S.,Friedrich - Alexander - University, Erlangen - Nuremberg | Fink R.H.,University ErlangenNurnberg
Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences | Year: 2010

Scanning transmission X-ray microspectroscopy (STXM) and L-edge near-edge X-ray absorption fine structure (NEXAFS) spectroscopy have been applied to study the valence states of metal ions in various Fe-and Mn-containing single-molecule magnet materials, in particular the ligand-stabilized metal complexes NaFe6 (so-called "ferric wheel"), Fe4 (so-called "ferric star") and Mn7 (so-called "manganese wheel"). We compare dose-dependent L-edge absorption spectra with the results of theoretical studies of the involved metal ions to conclude on the change in oxidation state upon increasing the X-ray dose. It is found that even low-intensity irradiation induces the reduction of the weakly interacting metal ions, and that the soft X-ray-induced photoreduction is less pronounced in microcrystalline films. © 2010 Verlag der Zeitschrift für Naturforschung, Tübingen.

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