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Search Results: 1 - 10 of 10152 matches for " Stefan Geyer "
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Code civil Allgemeiner Teil? Zur pandektenwissenschaftlichen Umdeutung des Code civil in Deutschland
Stefan Geyer
Forum Historiae Iuris , 2005,
Microstructural Parcellation of the Human Cerebral Cortex – From Brodmann's Post-Mortem Map to in vivo Mapping with High-Field Magnetic Resonance Imaging
Stefan Geyer,Robert Turner
Frontiers in Human Neuroscience , 2011, DOI: 10.3389/fnhum.2011.00019
Abstract: The year 2009 marked the 100th anniversary of the publication of the famous brain map of Korbinian Brodmann. Although a “classic” guide to microanatomical parcellation of the cerebral cortex, it is – from today’s state-of-the-art neuroimaging perspective – problematic to use Brodmann’s map as a structural guide to functional units in the cortex. In this article we discuss some of the reasons, especially the problematic compatibility of the “post-mortem world” of microstructural brain maps with the “in vivo world” of neuroimaging. We conclude with some prospects for the future of in vivo structural brain mapping: a new approach which has the enormous potential to make direct correlations between microstructure and function in living human brains: “in vivo Brodmann mapping” with high-field magnetic resonance imaging.
Visualizing Vertebrate Embryos with Episcopic 3D Imaging Techniques
Stefan H. Geyer,Timothy J. Mohun,Wolfgang J. Weninger
The Scientific World Journal , 2009, DOI: 10.1100/tsw.2009.154
Airborne Thermal Data Identifies Groundwater Discharge at the North-Western Coast of the Dead Sea
Ulf Mallast,Friedhelm Schwonke,Richard Gloaguen,Stefan Geyer,Martin Sauter,Christian Siebert
Remote Sensing , 2013, DOI: 10.3390/rs5126361
Abstract: A qualitative and quantitative monitoring of groundwater discharge was conducted based on an airborne thermal campaign undertaken along the north-western coast of the Dead Sea in January 2011 to contribute to the relatively scarce information on groundwater discharge to date in the region. The application of airborne thermal data exploits thermal contrasts that exist between discharging groundwater and background sea surface temperatures of the Dead Sea. Using these contrasts, 72 discharge sites were identified from which only 42 were known from previous in situ measurements undertaken at terrestrial springs by the Israel Hydrological Service. Six of these sites represent submarine springs and at a further 24 locations groundwater appears to seep through the sediment. Although the abundance of groundwater seepage sites suggests a significant, but so far unknown groundwater source, the main contribution appears to originate from terrestrial springs. In an attempt to provide a quantitative approach for terrestrial springs, a linear bootstrap regression model between in situ spring discharge and respective thermal discharge plumes (r 2 = 0.87 p < 0.001) is developed and presented here. While the results appear promising and could potentially be applied to derive discharge values at unmonitored sites, several influence factors need to be clarified before a robust and reliable model to efficiently derive a complete quantitative picture of groundwater discharge can be proposed.
How to engage the right brain hemisphere in aphasics without even singing: evidence for two paths of speech recovery
Benjamin Stahl,Ilona Henseler,Robert Turner,Stefan Geyer,Sonja A. Kotz
Frontiers in Human Neuroscience , 2013, DOI: 10.3389/fnhum.2013.00035
Abstract: There is an ongoing debate as to whether singing helps left-hemispheric stroke patients recover from non-fluent aphasia through stimulation of the right hemisphere. According to recent work, it may not be singing itself that aids speech production in non-fluent aphasic patients, but rhythm and lyric type. However, the long-term effects of melody and rhythm on speech recovery are largely unknown. In the current experiment, we tested 15 patients with chronic non-fluent aphasia who underwent either singing therapy, rhythmic therapy, or standard speech therapy. The experiment controlled for phonatory quality, vocal frequency variability, pitch accuracy, syllable duration, phonetic complexity and other influences, such as the acoustic setting and learning effects induced by the testing itself. The results provide the first evidence that singing and rhythmic speech may be similarly effective in the treatment of non-fluent aphasia. This finding may challenge the view that singing causes a transfer of language function from the left to the right hemisphere. Instead, both singing and rhythmic therapy patients made good progress in the production of common, formulaic phrases—known to be supported by right corticostriatal brain areas. This progress occurred at an early stage of both therapies and was stable over time. Conversely, patients receiving standard therapy made less progress in the production of formulaic phrases. They did, however, improve their production of non-formulaic speech, in contrast to singing and rhythmic therapy patients, who did not. In light of these results, it may be worth considering the combined use of standard therapy and the training of formulaic phrases, whether sung or rhythmically spoken. Standard therapy may engage, in particular, left perilesional brain regions, while training of formulaic phrases may open new ways of tapping into right-hemisphere language resources—even without singing.
Are there three subdivisions in the primate subthalamic nucleus?
Max C. Keuken,Harry B. M. Uylings,Stefan Geyer,Robert Turner,Birte U. Forstmann
Frontiers in Neuroanatomy , 2012, DOI: 10.3389/fnana.2012.00014
Abstract: The prevailing academic opinion holds that the subthalamic nucleus (STN) consists of three parts, each anatomically distinct and selectively associated with cognitive, emotional, or motor functioning. We independently tested this assumption by summarizing the results from 33 studies on STN subdivisions in human and nonhuman primates. The studies were conducted from 1925 to 2010 and feature three different techniques: electrical lesions, anterograde and retrograde tracers, and classical cytoarchitectonics. Our results reveal scant evidence in support of a tripartite STN. Instead, our results show that the variability across studies is surprisingly large, both in the number of subdivisions and in their anatomical localization. We conclude that the number of subdivisions in the STN remains uncertain, and that academic consensus in support of a tripartite STN is presently unwarranted.
Wave and Particle in Molecular Interference Lithography
Thomas Juffmann,Stefan Truppe,Philipp Geyer,Andras G. Major,Sarayut Deachapunya,Hendrik Ulbricht,Markus Arndt
Physics , 2010, DOI: 10.1103/PhysRevLett.103.263601
Abstract: The wave-particle duality of massive objects is a cornerstone of quantum physics and a key property of many modern tools such as electron microscopy, neutron diffraction or atom interferometry. Here we report on the first experimental demonstration of quantum interference lithography with complex molecules. Molecular matter-wave interference patterns are deposited onto a reconstructed Si(111) 7x7 surface and imaged using scanning tunneling microscopy. Thereby both the particle and the quantum wave character of the molecules can be visualized in one and the same image. This new approach to nanolithography therefore also represents a sensitive new detection scheme for quantum interference experiments.
A universal matter-wave interferometer with optical ionization gratings in the time domain
Philipp Haslinger,Nadine D?rre,Philipp Geyer,Jonas Rodewald,Stefan Nimmrichter,Markus Arndt
Physics , 2014, DOI: 10.1038/nphys2542
Abstract: Matter-wave interferometry with atoms and molecules has attracted a rapidly growing interest over the past two decades, both in demonstrations of fundamental quantum phenomena and in quantum-enhanced precision measurements. Such experiments exploit the non-classical superposition of two or more position and momentum states which are coherently split and rejoined to interfere. Here, we present the experimental realization of a universal near-field interferometer built from three short-pulse single-photon ionization gratings. We observe quantum interference of fast molecular clusters, with a composite de Broglie wavelength as small as 275 fm. Optical ionization gratings are largely independent of the specific internal level structure and are therefore universally applicable to different kinds of nanoparticles, ranging from atoms to clusters, molecules and nanospheres. The interferometer is sensitive to fringe shifts as small as a few nanometers and yet robust against velocity-dependent phase shifts, since the gratings exist only for nanoseconds and form an interferometer in the time domain.
Depression- and anxiety-related sick leave and the risk of permanent disability and mortality in the working population in Germany: a cohort study
Felix Wedegaertner, Sonja Arnhold-Kerri, Nicola-Alexander Sittaro, Stefan Bleich, Siegfried Geyer, William E Lee
BMC Public Health , 2013, DOI: 10.1186/1471-2458-13-145
Abstract: 128,001 German workers with statutory health insurance were followed for a mean of 6.4 years. We examined the associations between 1) depression/anxiety-related sick leave managed on an outpatient basis and 2) anxiety/depression-related psychiatric inpatient treatment, and later permanent disability/mortality using Cox proportional hazard regression models (stratified by sex and disorder) adjusted for age, education and job code classification.Outpatient-managed depression/anxiety-related sick leave was significantly associated with higher permanent disability (hazard ratio (95% confidence interval)) 1.48 (1.30, 1.69) for depression, 1.25 (1.07, 1.45) for anxiety, 1.91 (1.56, 2.35) for both). Among outpatients, comorbidly ill men (2.59 (1.97,3.41)) were more likely to retire early than women (1.42 (1.04,1.93)). Retirement rates were higher for depressive and comorbidly ill patients who needed inpatient treatment (depression 3.13 (2,51, 3,92), both 3.54 (2.80, 4.48)). Inpatient-treated depression was also associated with elevated mortality (2.50 (1.80, 3.48)). Anxiety (0.53 (0.38, 0.73)) and female outpatients with depression (0.61 (0.38, 0.97)) had reduced mortality compared to controls.Depression/anxiety diagnoses increase the risk of early retirement; comorbidity and severity further increase that risk, depression more strikingly than anxiety. Sickness-absence diagnoses of anxiety/depression identified a population at high risk of retiring early due to ill health, suggesting a target group for the development of interventions.
Towards a clearer definition and understanding of "Indiginous Community" for purposes of the Intellectual Property Laws Amendment Bill, 2010: an exploration of the concepts "Indiginous" and "Traditional"
S Geyer
Potchefstroom Electronic Law Journal/Potchefstroomse Elektroniese Regsblad , 2010,
Abstract: Although "indigenous" and "traditional" are key concepts in the Intellectual Property Laws Amendment Bill of 2010, they are not defined therein. The Bill does, however, provide a definition of "indigenous community" that is very clear as to where one should look for indigenous communities for the purposes of this Bill, and that there is likely to be a plurality of such communities, but is very vague as to which groups exactly will qualify as being indigenous. It is uncertain whether or not the current vague wording of the definition would be strong enough to widen the much narrower understanding of indigenousness prevailing in other South African legislation, the legislation of selected other jurisdictions, and the United Nations. Recommendations are made as to how the definition of an "indigenous community" may be rephrased to address these uncertainties more clearly.
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