Publications by authors named "Kathrin Lorenz"
Article Synopsis
- The study investigates the mechanisms behind negative BOLD responses (NBR) in the brain, particularly in the human visual cortex, contrasting them with typical positive BOLD responses (PBR).
- Researchers employed advanced imaging techniques to improve the measurement of cerebral blood flow (CBF) and its dynamics during visual stimulation, aiming to understand how these signals relate to brain activation and deactivation.
- Findings indicate that NBR exhibits quicker responses and different flow-metabolism coupling compared to PBR, suggesting varying neuronal contributions in activated and deactivated regions of the brain.
Article Synopsis
- - The study aims to analyze pseudo-continuous arterial spin labeling (pCASL) through simulations to optimize the measurement of cerebral blood flow using specific parameters.
- - Simulations based on the Bloch equation assessed different factors affecting labeling efficiency, including RF field strength and gradient settings, to improve measurement reliability in a clinical setting.
- - Findings suggest that optimal settings can achieve labeling efficiencies of about 90%, making pCASL effective regardless of magnetic field variations at 3T.
In the present work, the authors produce a Ti surface with a TiO₂ nanotube coating and investigate the electrochemical filling of these layers with MoO₃. The authors demonstrate that using a potential cycling technique, a homogenous MoO₃ coating can be generated. Controllable and variable coating thicknesses are achieved by a variation of the number of cycles.
View Article and Find Full Text PDFRapid contact- and contamination-free procurement of histologic material for proteomic and genomic analysis can be achieved by laser microdissection of the sample of interest followed by laser-induced transport (laser pressure catapulting). The dynamics of laser microdissection and laser pressure catapulting of histologic samples of 80 mum diameter was investigated by means of time-resolved photography. The working mechanism of microdissection was found to be plasma-mediated ablation initiated by linear absorption.
View Article and Find Full Text PDFRapid contact- and contamination-free procurement of specific samples of histologic material for proteomic and genomic analysis as well as separation and transport of living cells can be achieved by laser microdissection (LMD) of the sample of interest followed by a laser-induced forward transport process [laser pressure "catapulting," (LPC)] of the dissected material. We investigated the dynamics of LMD and LPC with focused and defocused laser pulses by means of time-resolved photography. The working mechanism of microdissection was found to be plasma-mediated ablation.
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