TY  - JOUR
A1  - Jarius, Sven
A1  - Ruprecht, Klemens
A1  - Wildemann, Brigitte
A1  - Kuempfel, Tania
A1  - Ringelstein, Marius
A1  - Geis, Christian
A1  - Kleiter, Ingo
A1  - Kleinschnitz, Christoph
A1  - Berthele, Achim
A1  - Brettschneider, Johannes
A1  - Hellwig, Kerstin
A1  - Hemmer, Bernhard
A1  - Linker, Ralf A.
A1  - Lauda, Florian
A1  - Hayrettin, Christoph A.
A1  - Tumani, Hayrettin
A1  - Melms, Arthur
A1  - Trebst, Corinna
A1  - Stangel, Martin
A1  - Marziniak, Martin
A1  - Hoffmann, Frank
A1  - Schippling, Sven
A1  - Faiss, Jürgen H.
A1  - Neuhaus, Oliver
A1  - Ettrich, Barbara
A1  - Zentner, Christian
A1  - Guthke, Kersten
A1  - Hofstadt-van Oy, Ulrich
A1  - Reuss, Reinhard
A1  - Pellkofer, Hannah
A1  - Ziemann, Ulf
A1  - Kern, Peter
A1  - Wandinger, Klaus P.
A1  - Bergh, Florian Then
A1  - Boettcher, Tobias
A1  - Langel, Stefan
A1  - Liebetrau, Martin
A1  - Rommer, Paulus S.
A1  - Niehaus, Sabine
A1  - Münch, Christoph
A1  - Winkelmann, Alexander
A1  - Zettl, Uwe K
A1  - Metz, Imke
A1  - Veauthier, Christian
A1  - Sieb, Jörn P.
A1  - Wilke, Christian
A1  - Hartung, Hans P.
A1  - Aktas, Orhan
A1  - Paul, Friedemann
T1  - Contrasting disease patterns in seropositive and seronegative neuromyelitis optica: A multicentre study of 175 patients
JF  - Journal of Neuroinflammation
N2  - Background: The diagnostic and pathophysiological relevance of antibodies to aquaporin-4 (AQP4-Ab) in patients with neuromyelitis optica spectrum disorders (NMOSD) has been intensively studied. However, little is known so far about the clinical impact of AQP4-Ab seropositivity. 
Objective: To analyse systematically the clinical and paraclinical features associated with NMO spectrum disorders in Caucasians in a stratified fashion according to the patients' AQP4-Ab serostatus. 
Methods: Retrospective study of 175 Caucasian patients (AQP4-Ab positive in 78.3%). 
Results: Seropositive patients were found to be predominantly female (p < 0.0003), to more often have signs of co-existing autoimmunity (p < 0.00001), and to experience more severe clinical attacks. A visual acuity of <= 0.1 during acute optic neuritis (ON) attacks was more frequent among seropositives (p < 0.002). Similarly, motor symptoms were more common in seropositive patients, the median Medical Research Council scale (MRC) grade worse, and MRC grades <= 2 more frequent, in particular if patients met the 2006 revised criteria (p < 0.005, p < 0.006 and p < 0.01, respectively), the total spinal cord lesion load was higher (p < 0.006), and lesions >= 6 vertebral segments as well as entire spinal cord involvement more frequent (p < 0.003 and p < 0.043). By contrast, bilateral ON at onset was more common in seronegatives (p < 0.007), as was simultaneous ON and myelitis (p < 0.001); accordingly, the time to diagnosis of NMO was shorter in the seronegative group (p < 0.029). The course of disease was more often monophasic in seronegatives (p < 0.008). Seropositives and seronegatives did not differ significantly with regard to age at onset, time to relapse, annualized relapse rates, outcome from relapse (complete, partial, no recovery), annualized EDSS increase, mortality rate, supratentorial brain lesions, brainstem lesions, history of carcinoma, frequency of preceding infections, oligoclonal bands, or CSF pleocytosis. Both the time to relapse and the time to diagnosis was longer if the disease started with ON (p < 0.002 and p < 0.013). Motor symptoms or tetraparesis at first myelitis and > 1 myelitis attacks in the first year were identified as possible predictors of a worse outcome.
KW  - cerebrospinal-fluid
KW  - intractable hiccup
KW  - extensiv transverse myelitis
KW  - multiple sclerosis
KW  - anti-aquaporin-4 antibody
KW  - NMO-IGG
KW  - aquaporin-4 autoantibodies
KW  - immune-response
KW  - myasthenia gravis
KW  - immunoglobulin-G
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-133636
VL  - 9
IS  - 14
ER  - 
TY  - JOUR
A1  - Kern, Christian S.
A1  - Haags, Anja
A1  - Egger, Larissa
A1  - Yang, Xiaosheng
A1  - Kirschner, Hans
A1  - Wolff, Susanne
A1  - Seyller, Thomas
A1  - Gottwald, Alexander
A1  - Richter, Mathias
A1  - de Giovannini, Umberto
A1  - Rubio, Angel
A1  - Ramsey, Michael G.
A1  - Bocquet, François C.
A1  - Soubatch, Serguei
A1  - Tautz, F. Stefan
A1  - Puschnig, Peter
A1  - Moser, Simon
T1  - Simple extension of the plane-wave final state in photoemission: bringing understanding to the photon-energy dependence of two-dimensional materials
JF  - Physical Review Research
N2  - Angle-resolved photoemission spectroscopy (ARPES) is a method that measures orbital and band structure contrast through the momentum distribution of photoelectrons. Its simplest interpretation is obtained in the plane-wave approximation, according to which photoelectrons propagate freely to the detector. The photoelectron momentum distribution is then essentially given by the Fourier transform of the real-space orbital. While the plane-wave approximation is remarkably successful in describing the momentum distributions of aromatic compounds, it generally fails to capture kinetic-energy-dependent final-state interference and dichroism effects. Focusing our present study on quasi-freestanding monolayer graphene as the archetypical two-dimensional (2D) material, we observe an exemplary E\(_{kin}\)-dependent modulation of, and a redistribution of spectral weight within, its characteristic horseshoe signature around the \(\bar {K}\) and \(\bar {K´}\) points: both effects indeed cannot be rationalized by the plane-wave final state. Our data are, however, in remarkable agreement with ab initio time-dependent density functional simulations of a freestanding graphene layer and can be explained by a simple extension of the plane-wave final state, permitting the two dipole-allowed partial waves emitted from the C 2p\(_z\) orbitals to scatter in the potential of their immediate surroundings. Exploiting the absolute photon flux calibration of the Metrology Light Source, this scattered-wave approximation allows us to extract E\(_{kin}\)-dependent amplitudes and phases of both partial waves directly from photoemission data. The scattered-wave approximation thus represents a powerful yet intuitive refinement of the plane-wave final state in photoemission of 2D materials and beyond.
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-350330
VL  - 5
IS  - 3
ER  -