@phdthesis{Hartwig2016, author = {Hartwig, Elisabeth}, title = {Kortikale Korrelate der Wahrnehmung interauraler Zeitdifferenzen gemessen mit Nahinfrarotspektroskopie}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-130391}, school = {Universit{\"a}t W{\"u}rzburg}, year = {2016}, abstract = {Die Wahrnehmung von interauralen Zeit- und Pegeldifferenzen spielt eine Schl{\"u}sselrolle f{\"u}r die Lokalisation von Schallquellen im Raum und f{\"u}r ein optimales Sprachverst{\"a}ndniss im St{\"o}rger{\"a}usch. Beim H{\"o}rgesch{\"a}digten ist die binaurale H{\"o}rf{\"a}higkeit deutlich eingeschr{\"a}nkt. Die bisherigen diagnostischen M{\"o}glichkeiten, diese H{\"o}rleistung zu erfassen, sind nicht zufriedenstellend und beschr{\"a}nken sich im Wesentlichen auf psychoakustische Methoden. Diese Verfahren sind jedoch bei p{\"a}diatrischen und beschr{\"a}nkt kommunikationsf{\"a}higen Patienten nur bedingt anwendbar. Ziel der Studie ist es, objektive Methoden im Hinblick auf ihre Eignung als Biomarker f{\"u}r das binaurale H{\"o}rvermogen zu evaluieren und weiterzuentwickeln. Erg{\"a}nzend dazu sollen der Entwicklungsstand und die funktionelle Plastizit{\"a}t des zentralen auditiven Systems als Einflussgr{\"o}ße mitbeurteilt werden. Untersucht wurden in dieser Studie zun{\"a}chst normalh{\"o}rende Kontrollpersonen. Die subjektive Lokalisationsf{\"a}higkeit wurde mit Hilfe psychoakustischer Tests {\"u}berpr{\"u}ft und mit objektiven, funktionell bildgebenden Verfahren korreliert. Die kortikale Repr{\"a}sentation binauraler Stimuli und die Unterschiede der Oxygenierung des Hirngewebes werden mit Nahinfrarot Spektroskopie dargestellt. Als Stimuli dienen bei allen Testverfahren identische akustische Reize unterschiedlicher Komplexit{\"a}t. Es wird erwartet, dass die Validierung objektiver Marker f{\"u}r das binaurale H{\"o}ren eine Optimierung der H{\"o}rhilfeneinstellung erm{\"o}glicht und zu einer Verbesserung der H{\"o}r- und Lebensqualit{\"a}t h{\"o}rgesch{\"a}digter Patienten f{\"u}hrt.}, subject = {NIRS}, language = {de} } @article{SchendzielorzFroelichRaketal.2016, author = {Schendzielorz, P. and Froelich, K. and Rak, K. and Gehrke, T. and Scherzad, A. and Hagen, R. and Radeloff, A.}, title = {Labeling Adipose-Derived Stem Cells with Hoechst 33342: Usability and Effects on Differentiation Potential and DNA Damage}, series = {Stem Cells International}, journal = {Stem Cells International}, doi = {10.1155/2016/6549347}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-181268}, year = {2016}, abstract = {Adipose-derived stem cells (ASCs) have been extensively studied in the field of stem cell research and possess numerous clinical applications. Cell labeling is an essential component of various experimental protocols and Hoechst 33342 (H33342) represents a cost-effective and easy methodology for live staining. The purpose of this study was to evaluate the labeling of rat ASCs with two different concentrations of H33342 (0.5 μg/mL and 5 μg/mL), with particular regard to usability, interference with cell properties, and potential DNA damage. Hoechst 33342 used at a low concentration of 0.5 μg/mL did not significantly affect cell proliferation, viability, or differentiation potential of the ASCs, nor did it cause any significant DNA damage as measured by the olive tail moment. High concentrations of 5 μg/mL H33342, however, impaired the proliferation and viability of the ASCs, and considerable DNA damage was observed. Undesirable colabeling of unlabeled cocultivated cells was seen in particular with higher concentrations of H33342, independent of varying washing procedures. Hence, H33342 labeling with lower concentrations represents a usable method, which does not affect the tested cell properties. However, the colabeling of adjacent cells is a drawback of the technique.}, language = {en} } @article{KurabiPakBernhardtetal.2016, author = {Kurabi, Arwa and Pak, Kwang K. and Bernhardt, Marlen and Baird, Andrew and Ryan, Allen F.}, title = {Discovery of a Biological Mechanism of Active Transport through the Tympanic Membrane to the Middle Ear}, series = {Scientific Reports}, volume = {6}, journal = {Scientific Reports}, number = {22663}, doi = {10.1038/srep22663}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-167741}, year = {2016}, abstract = {Otitis media (OM) is a common pediatric disease for which systemic antibiotics are often prescribed. While local treatment would avoid the systemic treatment side-effects, the tympanic membrane (TM) represents an impenetrable barrier unless surgically breached. We hypothesized that the TM might harbor innate biological mechanisms that could mediate trans-TM transport. We used two M13-bacteriophage display biopanning strategies to search for mediators of trans-TM transport. First, aliquots of linear phage library displaying 10\(^{10th}\) 12mer peptides were applied on the TM of rats with active bacterial OM. The middle ear (ME) contents were then harvested, amplified and the preparation re-applied for additional rounds. Second, the same na{\"i}ve library was sequentially screened for phage exhibiting TM binding, internalization and then transit. Results revealed a novel set of peptides that transit across the TM to the ME in a time and temperature dependent manner. The peptides with highest transport capacities shared sequence similarities. Historically, the TM was viewed as an impermeable barrier. However, our studies reveal that it is possible to translocate peptide-linked small particles across the TM. This is the first comprehensive biopanning for the isolation of TM transiting peptidic ligands. The identified mechanism offers a new drug delivery platform into the ME.}, language = {en} }