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Deppe M, Abdelnaim M, Hebel T, Kreuzer PM, Poeppl TB, Langguth B, Schecklmann M. Concomitant lorazepam use and antidepressive efficacy of repetitive transcranial magnetic stimulation in a naturalistic setting. Eur Arch Psychiatry Clin Neurosci 2021; 271:61-67. [PMID: 32648109 PMCID: PMC7867521 DOI: 10.1007/s00406-020-01160-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 06/29/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND/OBJECTIVES Repetitive transcranial magnetic stimulation (rTMS) has been established as an effective therapeutic intervention for the treatment of depression. Preliminary data suggest that the efficacy of rTMS is reduced in patients taking benzodiazepines (BZD). Here, we use real-world data from a large sample to investigate the influence of lorazepam on the effectiveness of rTMS. METHODS From a retrospective cohort of clinically depressed patients that were treated with rTMS, we compared 176 patients not taking any BZD with 73 patients taking lorazepam with respect to changes in the Hamilton Depression Rating Scale (HRDS). RESULTS Both groups improved during rTMS according to HRDS scores, but the amelioration of symptoms was significantly less pronounced in patients taking lorazepam (18% vs. 38% responders in the non-lorazepam group). We could not see any association of intake regimen of lorazepam with response in rTMS. CONCLUSION Our observational study suggests that intake of lorazepam impedes the response to rTMS. The impact of lorazepam and other BZD on rTMS should receive more attention and be further investigated in prospective, hypothesis-based treatment studies to determine causal relationships between medication treatments and outcome. This could lead to specific recommendations for pharmacological treatment for depressed patients undergoing rTMS.
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Affiliation(s)
- M. Deppe
- Department of Psychiatry and Psychotherapy, University Regensburg, Regensburg, Germany
| | - M. Abdelnaim
- Department of Psychiatry and Psychotherapy, University Regensburg, Regensburg, Germany
| | - T. Hebel
- Department of Psychiatry and Psychotherapy, University Regensburg, Regensburg, Germany
| | - P. M. Kreuzer
- Department of Psychiatry and Psychotherapy, University Regensburg, Regensburg, Germany
| | - T. B. Poeppl
- Department of Psychiatry and Psychotherapy, University Regensburg, Regensburg, Germany ,Department of Psychiatry, Psychotherapy, and Psychosomatics, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - B. Langguth
- Department of Psychiatry and Psychotherapy, University Regensburg, Regensburg, Germany
| | - M. Schecklmann
- Department of Psychiatry and Psychotherapy, University Regensburg, Regensburg, Germany
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Harding D, Giles SL, Brown MRD, Ter Haar GR, van den Bosch M, Bartels LW, Kim YS, Deppe M, deSouza NM. Evaluation of Quality of Life Outcomes Following Palliative Treatment of Bone Metastases with Magnetic Resonance-guided High Intensity Focused Ultrasound: An International Multicentre Study. Clin Oncol (R Coll Radiol) 2018; 30:233-242. [PMID: 29317145 PMCID: PMC5842401 DOI: 10.1016/j.clon.2017.12.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 11/27/2017] [Accepted: 11/29/2017] [Indexed: 11/26/2022]
Abstract
AIMS To determine quality of life (QoL) outcomes after palliation of pain from bone metastases using magnetic resonance-guided high intensity focused ultrasound (MR-guided HIFU), measured using the European Organization for Research and Treatment of Cancer (EORTC) QLQ-C15-PAL and the QLQ-BM22 questionnaires. MATERIALS AND METHODS Twenty patients undergoing MR-guided HIFU in an international multicentre trial self-completed the QLQ-C15-PAL and QLQ-BM22 questionnaires before and on days 7, 14, 30, 60 and 90 post-treatment. Descriptive statistics were used to represent changes in symptom and functional scales over time and to determine their clinical significance. QoL changes were compared in pain responders and non-responders (who were classified according to change in worst pain score and analgesic intake, between baseline and day 30). RESULTS Eighteen patients had analysable QoL data. Clinically significant improvements were seen in the QoL scales of physical functioning, fatigue, appetite loss, nausea and vomiting, constipation and pain in the 53% of patients who were classified as responders at day 30. No significant changes were seen in the 47% of patients who were non-responders at this time point. CONCLUSION Local treatment of pain from bone metastases with MR-guided HIFU, even in the presence of disseminated malignancy, has a substantial positive effect on physical functioning, and improves other symptomatic QoL measures. This indicated a greater response to treatment over and above pain control alone. MR-guided HIFU is non-invasive and should be considered for patients with localised metastatic bone pain and poor QoL.
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Affiliation(s)
- D Harding
- The CRUK Cancer Imaging Centre, The Institute of Cancer Research and Royal Marsden Hospital, MRI Unit, Sutton, Surrey, UK
| | - S L Giles
- The CRUK Cancer Imaging Centre, The Institute of Cancer Research and Royal Marsden Hospital, MRI Unit, Sutton, Surrey, UK.
| | - M R D Brown
- Pain Medicine Department, The Royal Marsden Hospital, Sutton, Surrey, UK
| | - G R Ter Haar
- The CRUK Cancer Imaging Centre, The Institute of Cancer Research and Royal Marsden Hospital, MRI Unit, Sutton, Surrey, UK
| | - M van den Bosch
- Image Sciences Institute/Imaging Division, University Medical Center Utrecht, The Netherlands
| | - L W Bartels
- Image Sciences Institute/Imaging Division, University Medical Center Utrecht, The Netherlands
| | - Y-S Kim
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, School of Medicine, Sungkyunkwan University, Seoul, South Korea; Department of Radiology, Mint Hospital, Seoul, South Korea
| | - M Deppe
- Philips MR Therapy, Äyritie 4, 01510 Vantaa, Finland
| | - N M deSouza
- The CRUK Cancer Imaging Centre, The Institute of Cancer Research and Royal Marsden Hospital, MRI Unit, Sutton, Surrey, UK
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Dannlowski U, Grabe HJ, Wittfeld K, Klaus J, Konrad C, Grotegerd D, Redlich R, Suslow T, Opel N, Ohrmann P, Bauer J, Zwanzger P, Laeger I, Hohoff C, Arolt V, Heindel W, Deppe M, Domschke K, Hegenscheid K, Völzke H, Stacey D, Meyer Zu Schwabedissen H, Kugel H, Baune BT. Multimodal imaging of a tescalcin (TESC)-regulating polymorphism (rs7294919)-specific effects on hippocampal gray matter structure. Mol Psychiatry 2015; 20:398-404. [PMID: 24776739 DOI: 10.1038/mp.2014.39] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 02/09/2014] [Accepted: 03/17/2014] [Indexed: 02/07/2023]
Abstract
In two large genome-wide association studies, an intergenic single-nucleotide polymorphism (SNP; rs7294919) involved in TESC gene regulation has been associated with hippocampus volume. Further characterization of neurobiological effects of the TESC gene is warranted using multimodal brain-wide structural and functional imaging. Voxel-based morphometry (VBM8) was used in two large, well-characterized samples of healthy individuals of West-European ancestry (Münster sample, N=503; SHIP-TREND, N=721) to analyze associations between rs7294919 and local gray matter volume. In subsamples, white matter fiber structure was investigated using diffusion tensor imaging (DTI) and limbic responsiveness was measured by means of functional magnetic resonance imaging (fMRI) during facial emotion processing (N=220 and N=264, respectively). Furthermore, gene x environment (G × E) interaction and gene x gene interaction with SNPs from genes previously found to be associated with hippocampal size (FKBP5, Reelin, IL-6, TNF-α, BDNF and 5-HTTLPR/rs25531) were explored. We demonstrated highly significant effects of rs7294919 on hippocampal gray matter volumes in both samples. In whole-brain analyses, no other brain areas except the hippocampal formation and adjacent temporal structures were associated with rs7294919. There were no genotype effects on DTI and fMRI results, including functional connectivity measures. No G × E interaction with childhood maltreatment was found in both samples. However, an interaction between rs7294919 and rs2299403 in the Reelin gene was found that withstood correction for multiple comparisons. We conclude that rs7294919 exerts highly robust and regionally specific effects on hippocampal gray matter structures, but not on other neuropsychiatrically relevant imaging markers. The biological interaction between TESC and RELN pointing to a neurodevelopmental origin of the observed findings warrants further mechanistic investigations.
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Affiliation(s)
- U Dannlowski
- 1] Department of Psychiatry, University of Münster, Münster, Germany [2] Department of Psychiatry, University of Marburg, Marburg, Germany
| | - H J Grabe
- 1] Department of Psychiatry, University Medicine Greifswald, HELIOS-Hospital Stralsund, Stralsund, Germany [2] German Center for Neurodegenerative Diseases (DZNE), Site Rostock/Greifswald, Greifswald, Germany
| | - K Wittfeld
- German Center for Neurodegenerative Diseases (DZNE), Site Rostock/Greifswald, Greifswald, Germany
| | - J Klaus
- Department of Psychiatry, University of Münster, Münster, Germany
| | - C Konrad
- Department of Psychiatry, University of Marburg, Marburg, Germany
| | - D Grotegerd
- Department of Psychiatry, University of Münster, Münster, Germany
| | - R Redlich
- Department of Psychiatry, University of Münster, Münster, Germany
| | - T Suslow
- 1] Department of Psychiatry, University of Münster, Münster, Germany [2] Department of Psychosomatic Medicine and Psychotherapy, University of Leipzig, Leipzig, Germany
| | - N Opel
- Department of Psychiatry, University of Münster, Münster, Germany
| | - P Ohrmann
- Department of Psychiatry, University of Münster, Münster, Germany
| | - J Bauer
- Department of Psychiatry, University of Münster, Münster, Germany
| | - P Zwanzger
- Department of Psychiatry, University of Münster, Münster, Germany
| | - I Laeger
- Department of Psychiatry, University of Münster, Münster, Germany
| | - C Hohoff
- Department of Psychiatry, University of Münster, Münster, Germany
| | - V Arolt
- Department of Psychiatry, University of Münster, Münster, Germany
| | - W Heindel
- Department of Clinical Radiology, University of Münster, Münster, Germany
| | - M Deppe
- Department of Neurology, University of Münster, Münster, Germany
| | - K Domschke
- Department of Psychiatry, University of Würzburg, Würzburg, Germany
| | - K Hegenscheid
- Institute of Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, Greifswald, Germany
| | - H Völzke
- Institute for Community Medicine, University Medicine Greifswald, Greifswald, Germany
| | - D Stacey
- Discipline of Psychiatry, School of Medicine, University of Adelaide: North Terrace, Adelaide, SA, Australia
| | | | - H Kugel
- Department of Clinical Radiology, University of Münster, Münster, Germany
| | - B T Baune
- Discipline of Psychiatry, School of Medicine, University of Adelaide: North Terrace, Adelaide, SA, Australia
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Khomenko A, Baldaranov D, Grassinger J, Johannesen S, Kobor I, Roesl J, Kollewe K, Petri S, Dengler R, Deppe M, Ludolph A, Kassubek J, Schuierer G, Bruun T, Schulte-Mattler W, Bogdahn U. “Reporting biomarker” development: Update in als patients treated with G-CSF -mobilized hematopoietic stem cells. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.1570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Deppe M, Heinecke A. Odds-Ratio und Relatives Risiko. KLIN NEUROPHYSIOL 2013. [DOI: 10.1055/s-0032-1327665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- M. Deppe
- Klinik für Neurologie, Universitätsklinikum Münster
| | - A. Heinecke
- Institut für Medizinische Informatik und Biomathematik, Universität Münster
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Kleffner I, Duning T, Lohmann H, Deppe M, Basel T, Promesberger J, Dörr J, Schwindt W, Ringelstein EB. A brief review of Susac syndrome. J Neurol Sci 2012; 322:35-40. [PMID: 22640902 DOI: 10.1016/j.jns.2012.05.021] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 04/29/2012] [Accepted: 05/05/2012] [Indexed: 10/28/2022]
Abstract
Susac syndrome was named after J.O. Susac who first described the syndrome in 1979. It is characterized by the clinical triad of encephalopathy, branch retinal artery occlusion, and sensorineural hearing loss. It mainly occurs in young women. This underdiagnosed disease needs to be considered in the differential diagnosis of a broad variety of disorders. In Susac syndrome, autoimmune processes leading to damage and inflammation-related occlusion of the microvessels in brain, retina, and inner ear are thought to play a causal role. The diagnosis is based primarily on the clinical presentation, the documentation of branch retinal artery occlusion by fluorescence angiography, and characteristic findings on cerebral MRI, that help in distinguishing Susac syndrome from other inflammatory entities, like multiple sclerosis. Antiendothelial cell antibodies could be detected in some patients. Patients are successfully treated with immunosuppression, however, the best regimen still needs to be defined. As a result of the rarity of the disease, controlled therapeutic trials are missing so far. In this review, we want to demonstrate the clinical features, natural history, treatment, and clinical course of Susac syndrome, illustrated by a typical case history.
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Affiliation(s)
- I Kleffner
- Department of Neurology, University of Muenster, Germany.
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List J, Duning T, Meinzer M, Kurten J, Schirmacher A, Deppe M, Evers S, Young P, Floel A. Enhanced Rapid-Onset Cortical Plasticity in CADASIL as a Possible Mechanism of Preserved Cognition. Cereb Cortex 2011; 21:2774-87. [DOI: 10.1093/cercor/bhr071] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Dirks C, Jansen A, Deppe M, Lohmann H. - Interaktion von Sprache und Gedächtnis bei Probanden mit typischer und atypischer Sprachdominanz. KLIN NEUROPHYSIOL 2011. [DOI: 10.1055/s-0031-1272792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Hölzner E, Lippross V, Hermann S, Nagelmann N, Heselhaus J, Bohlen S, Kugel H, Deppe M, Sommer J, Bremer C, Nguyen H, Riess O, Hörsten SV, Schäfers M, Jacobs A, Reilmann R. PET/MRI-based phenotyping of a transgenic rat model for Huntington's disease - a 16 months follow-up study. KLIN NEUROPHYSIOL 2011. [DOI: 10.1055/s-0031-1272762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sánchez R, Deppe M, Schulz M, Bravo P, Villegas J, Morales P, Risopatrón J. Participation of the sperm proteasome during in vitro fertilisation and the acrosome reaction in cattle. Andrologia 2011; 43:114-20. [PMID: 21382065 DOI: 10.1111/j.1439-0272.2009.01031.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
In this work, we have investigated the role of the bovine sperm proteasome during in vitro fertilisation (IVF) and the acrosome reaction (AR). Motile spermatozoa, obtained by a swim-up method in Sperm-Talp medium, were capacitated for 3.5 h and incubated in the presence or absence of the specific proteasome inhibitor epoxomicin for 30 and 60 min. Then, the spermatozoa were co-incubated with mature bovine cumulus oocytes and after 48 h the cleavage rate of inseminated oocytes was evaluated. In addition, we evaluated the participation of the sperm proteasome during the progesterone-induced AR. Capacitated spermatozoa were incubated for 30 min with or without epoxomicin, then progesterone was added and the ARs were evaluated using the dual fluorescent staining technique 'Hoechst and chlortetracycline'. The results indicate that the proteasome inhibitor decreased the cleavage rate of oocytes inseminated with treated spermatozoa. In addition, acrosomal exocytosis levels were statistically significantly higher in the samples treated with the AR inducer progesterone than in control samples in the absence of the inducer. However, the progesterone-induced AR was significantly reduced by previous treatment of the spermatozoa with epoxomicin (P < 0.001). These observations indicate that the bovine sperm proteasome participates in the IVF and AR processes.
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Affiliation(s)
- R Sánchez
- Department of Preclinical Science, Faculty of Medicine, BIOREN-CEBIOR, Universidad De La Frontera, Temuco, Chile.
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Kleffner I, Deppe M, Mohammadi S, Schwindt W, Sommer J, Young P, Ringelstein E. Neuroimaging in Susac's syndrome: Focus on DTI. J Neurol Sci 2010; 299:92-6. [DOI: 10.1016/j.jns.2010.08.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Revised: 08/23/2010] [Accepted: 08/23/2010] [Indexed: 10/19/2022]
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Wersching H, Duning T, Lohmann H, Mohammadi S, Stehling C, Fobker M, Conty M, Minnerup J, Ringelstein EB, Berger K, Deppe M, Knecht S. Serum C-reactive protein is linked to cerebral microstructural integrity and cognitive function. Neurology 2010; 74:1022-9. [PMID: 20350977 DOI: 10.1212/wnl.0b013e3181d7b45b] [Citation(s) in RCA: 159] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE C-reactive protein is a marker of inflammation and vascular disease. It also seems to be associated with an increased risk of dementia. To better understand potential underlying mechanisms, we assessed microstructural brain integrity and cognitive performance relative to serum levels of high-sensitivity C-reactive protein (hs-CRP). METHODS We cross-sectionally examined 447 community-dwelling and stroke-free individuals from the Systematic Evaluation and Alteration of Risk Factors for Cognitive Health (SEARCH) Health Study (mean age 63 years, 248 female). High-field MRI was performed in 321 of these subjects. Imaging measures included fluid-attenuated inversion recovery sequences for assessment of white matter hyperintensities, automated quantification of brain parenchyma volumes, and diffusion tensor imaging for calculation of global and regional white matter integrity, quantified by fractional anisotropy (FA). Psychometric analyses covered verbal memory, word fluency, and executive functions. RESULTS Higher levels of hs-CRP were associated with worse performance in executive function after adjustment for age, gender, education, and cardiovascular risk factors in multiple regression analysis (beta = -0.095, p = 0.02). Moreover, higher hs-CRP was related to reduced global fractional anisotropy (beta = -0.237, p < 0.001), as well as regional FA scores of the frontal lobes (beta = -0.246, p < 0.001), the corona radiata (beta = -0.222, p < 0.001), and the corpus callosum (beta = -0.141, p = 0.016), in particular the genu (beta = -0.174, p = 0.004). We did not observe a significant association of hs-CRP with measures of white matter hyperintensities or brain atrophy. CONCLUSION These data suggest that low-grade inflammation as assessed by high-sensitivity C-reactive protein is associated with cerebral microstructural disintegration that predominantly affects frontal pathways and corresponding executive function.
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Affiliation(s)
- H Wersching
- Institute of Epidemiology and Social Medicine, University of Münster, Domagkstrasse 3, 48149 Münster, Germany.
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Duning T, Warnecke T, Deppe M, Schiffbauer H, Knecht S, Schäbitz WR. G-CSF prevents the progression of structural disintegration of white matter tracts in amyotrophic lateral sclerosis: A pilot study. KLIN NEUROPHYSIOL 2010. [DOI: 10.1055/s-0030-1250873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Beye M, Hennies F, Deppe M, Suljoti E, Nagasono M, Wurth W, Föhlisch A. Dynamics of electron-phonon scattering: crystal- and angular-momentum transfer probed by resonant inelastic x-ray scattering. Phys Rev Lett 2009; 103:237401. [PMID: 20366170 DOI: 10.1103/physrevlett.103.237401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2009] [Indexed: 05/29/2023]
Abstract
Experimentally, we observe angular-momentum transfer in electron-phonon scattering, although it is commonly agreed that phonons transfer mostly linear momentum. Therefore, the incorporation of angular momentum to describe phonons is necessary already for simple semiconductors and bears significant implications for the formation of new quasiparticles in correlated functional materials. Separation of linear and angular-momentum transfer in electron-phonon scattering is achieved by highly selective excitations on the femtosecond time scale of resonant inelastic x-ray scattering.
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Affiliation(s)
- M Beye
- Institut für Experimentalphysik, Universität Hamburg and Centre for Free-Electron Laser Science, Hamburg, Germany.
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15
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Suljoti E, de Groot FMF, Nagasono M, Glatzel P, Hennies F, Deppe M, Pietzsch A, Sonntag B, Föhlisch A, Wurth W. Spin-orbit mediated interference in the radiative and nonradiative channels of the La 4d core resonances. Phys Rev Lett 2009; 103:137401. [PMID: 19905539 DOI: 10.1103/physrevlett.103.137401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Indexed: 05/28/2023]
Abstract
Symmetrical fluorescence yield profiles and asymmetrical electron yield profiles of the preresonances at the La N_{IV,V} x-ray absorption edge are experimentally observed in LaPO_{4} nanoparticles. Theoretical studies show that they are caused by interference effects. The spin-orbit interaction and the giant resonance produce symmetry entangled intermediate states that activate coherent scattering and alter the spectral distribution of the oscillator strength. The scattering amplitudes of the electron and fluorescence decays are further modified by the spin-orbit coupling in the final 5p;{5}epsilonl and 5p;{5}4f;{1} states.
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Affiliation(s)
- E Suljoti
- Department of Physics, University of Hamburg, 22761 Hamburg, Germany.
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Kleffner I, Wersching H, Schwindt W, Keyvani K, Deppe M, Husstedt I. Motoneuronerkrankung im Frühstadium der HIV-Infektion. KLIN NEUROPHYSIOL 2009. [DOI: 10.1055/s-0029-1220393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Breitenstein C, Meinzer M, Mohammadi S, Schiffbauer H, Kugel H, Albers J, Menke R, Flöel A, Baumgärtner A, Kramer K, Knecht S, Deppe M. Integrität des Hippokampus prädiziert Verbesserungen der Benennleistung nach intensiver Sprachtherapie bei chronischer Aphasie. Akt Neurol 2009. [DOI: 10.1055/s-0029-1238417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lippross V, Hermann S, Nagelmann N, Heselhaus J, Bohlen S, Kugel H, Deppe M, Sommer J, Bremer C, Nguyen H, Riess O, Hörsten SV, Schäfers M, Reilmann R. In vivo assessment of neuronal dysfunction in rats transgenic for Huntington's disease using small animal FDG-PET and MRI – a 16 months follow-up study. Akt Neurol 2009. [DOI: 10.1055/s-0029-1238559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Holtbernd F, Deppe M, Bachmann R, Reilmann R. Objective motor phenotype assessment in multiple sclerosis: deficits in grip force coordination correlate to changes in diffusion tensor imaging. Akt Neurol 2009. [DOI: 10.1055/s-0029-1238399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Wersching H, Kleffner I, Schwindt W, Keyvani K, Deppe M, Husstedt IW. Eine schwere und rasch fortschreitende Erkrankung der Pyramidenbahn und des Hirnstamms – Motoneuronerkrankung als Folge einer HIV-Infektion. Akt Neurol 2009. [DOI: 10.1055/s-0029-1238628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Stubbe-Dräger B, Deppe M, Mohammadi S, Kugel H, Gregor N, Evers S, Ringelstein EB, Arendt G, Knecht S, Husstedt IW. Veränderungen der weißen Substanz bei HIV Patienten – eine DTI-Studie. Akt Neurol 2009. [DOI: 10.1055/s-0029-1238423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kleffner I, Deppe M, Mohammadi S, Schiffbauer H, Stupp N, Lohmann H, Young P, Ringelstein E. Diffusion tensor imaging demonstrates fiber impairment in Susac's syndrome. J Neurol Sci 2009. [DOI: 10.1016/j.jns.2009.02.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Duning T, Wersching H, Lohmann H, Stehling C, Knecht S, Deppe M. C-Reactive Protein in healthy individuals is associated with executive dysfunction and white matter alterations. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)71952-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Deppe M, Kellinghaus C, Duning T, Möddel G, Mohammadi S, Deppe K, Kugel H, Keller SS, Ringelstein EB, Knecht S. DTI is more sensitive in detecting brain abnormalities in juvenile myoclonic epilepsy than conventional MRI. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)71041-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Westerkamp T, Deppe M, Küchler R, Brando M, Geibel C, Gegenwart P, Pikul AP, Steglich F. Kondo-cluster-glass state near a ferromagnetic quantum phase transition. Phys Rev Lett 2009; 102:206404. [PMID: 19519047 DOI: 10.1103/physrevlett.102.206404] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2008] [Indexed: 05/27/2023]
Abstract
We report on a comprehensive study of CePd(1-x)Rh(x) (0.6 <or= x <or= 0.95) poly- and single crystals close to the ferromagnetic instability by means of low-temperature ac susceptibility, magnetization, and volume thermal expansion. The signature of ferromagnetism in this heavy-fermion system can be traced from 6.6 K in CePd down to 25 mK for x = 0.87. Despite pronounced non-Fermi-liquid effects in both specific heat and thermal expansion, the Grüneisen ratio does not diverge as T --> 0, providing evidence for the absence of a quantum critical point. Instead, a peculiar "Kondo-cluster-glass" state is found for x >or= 0.65, and the non-Fermi-liquid effects in the specific heat, ac susceptibility, and magnetization are compatible with the quantum Griffiths phase scenario.
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Affiliation(s)
- T Westerkamp
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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Deppe M, Caroca-Canales N, Hartmann S, Oeschler N, Geibel C. New non-magnetically ordered heavy-fermion system CeTiGe. J Phys Condens Matter 2009; 21:206001. [PMID: 21825538 DOI: 10.1088/0953-8984/21/20/206001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Investigations of the susceptibility, electrical resistivity, specific heat and thermopower of CeTiGe at low temperatures show that this compound is a Kondo lattice system with an enhanced Sommerfeld coefficient γ≈0.3 J K(-2) mol(-1) and where the whole J = 5/2 multiplet is involved in the formation of the ground state. No magnetic order was observed down to 0.4 K. In the temperature range below 10 K we observed Fermi-liquid behavior as indicated by a ρ(T)∼T(2) dependence in the electrical resistivity and a linear specific heat and thermopower. Because of these results we classify CeTiGe as a moderate heavy-fermion system with a non-magnetic ground state.
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Affiliation(s)
- M Deppe
- Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
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Duning T, Warnecke T, Mohammadi S, Lohmann H, Schiffbauer H, Kugel H, Knecht S, Ringelstein EB, Deppe M. Pattern and progression of white-matter changes in a case of posterior cortical atrophy using diffusion tensor imaging. J Neurol Neurosurg Psychiatry 2009; 80:432-6. [PMID: 19289480 DOI: 10.1136/jnnp.2008.153148] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND The progression of white-matter changes in a case of posterior cortical atrophy (PCA) was examined over a period of 15 months using diffusion tensor imaging (DTI) and the association with neuropsychological variables was studied. PATIENT AND METHODS A PCA patient was observed over a period of 15 months. DTI and volumetric magnetic resonance imaging were obtained at visit 1 and 15 months later. Fractional anisotropy (FA) and volumetric changes were compared with findings in a typical case of Alzheimer disease (AD) and in 65 healthy volunteers, and the association of neuropsychological deficits with these changes was studied. RESULTS Reduction in FA was focused on the occipital lobe in the early stages of PCA. During the 15-month period, the FA values of the PCA patient tended to align with the FA ratios of the AD patient, with a more pronounced FA reduction in the parietal lobes, as opposed to a stable FA level in the occipital lobe. In addition to the DTI changes, clinical and neuropsychological symptoms deteriorated further. Brain volumes (grey matter, white matter and total normalised brain volume) of the PCA patient were substantially decreased compared with the control group, but loss of tissue volumes showed only marginal progression between visit 1 and 2. CONCLUSIONS The findings suggest that PCA starts as distinct clinical syndrome but in its later course might turn into a final pathway shared with AD. DTI might be helpful in detecting changes in cerebral white matter during disease progression in PCA patients.
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Affiliation(s)
- T Duning
- Department of Neurology, University Hospital of Münster, Münster, Germany.
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29
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Deppe M, Kellinghaus C, Duning T, Möddel G, Mohammadi S, Deppe K, Schiffbauer H, Kugel H, Keller SS, Ringelstein EB, Knecht S. Nerve fiber impairment of anterior thalamocortical circuitry in juvenile myoclonic epilepsy. Neurology 2008; 71:1981-5. [PMID: 19064879 DOI: 10.1212/01.wnl.0000336969.98241.17] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- M Deppe
- Department of Neurology, University of Muenster, Albert-Schweitzer-Str. 33, 48129 Muenster, Germany.
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Deppe M, Morales P, Sánchez R. Effect of Protease Inhibitors on the Acrosome Reaction and Sperm-Zona Pellucida Binding in Bovine Sperm. Reprod Domest Anim 2008; 43:713-9. [DOI: 10.1111/j.1439-0531.2007.00977.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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31
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Deppe M, Risopatrón J, Sánchez R. Trypsin and Chymotrypsin are Involved in the Progesterone-Induced Acrosome Reaction in Canine Spermatozoa. Reprod Domest Anim 2008; 45:453-7. [DOI: 10.1111/j.1439-0531.2008.01225.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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32
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Deppe M, Knecht S, Papke K, Henningsen H, Ringelstein E. Funktionelle TCD: Vergleich mit der funktionellen Magnetresonanztomographie. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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33
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Deppe M, Föhlisch A, Hennies F, Nagasono M, Beye M, Sánchez-Portal D, Echenique PM, Wurth W. Ultrafast charge transfer and atomic orbital polarization. J Chem Phys 2007; 127:174708. [DOI: 10.1063/1.2781395] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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34
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Kleffner I, Deppe M, Mohammadi S, Schiffbauer H, Stupp N, Lohmann H, Young P, Ringelstein EB. DIFFUSION TENSOR IMAGING DEMONSTRATES FIBER IMPAIRMENT IN SUSAC SYNDROME. Neurology 2007; 70:1867-9. [DOI: 10.1212/01.wnl.0000280580.95671.01] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Liuzzi G, Jansen A, Deppe M, Kanowski M, Oelschläger C, Albers JM, Knecht S. Strukturelle Korrelate funktioneller Sprachdominanz – Eine voxel-based morphometry Studie. KLIN NEUROPHYSIOL 2007. [DOI: 10.1055/s-2007-976354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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36
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Reilmann R, Holtbernd F, Bachmann R, Ringelstein EB, Deppe M. Region specific fractional anisotropy in diffusion tensor MR imaging reveals EDSS correlation in patients with Multiple Sclerosis. Akt Neurol 2007. [DOI: 10.1055/s-2007-988003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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37
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Duning T, Wersching H, Lohmann H, Deppe M, Knecht S. Body Mass Index und volumetrische Unterschiede des zerebralen Kortex. Akt Neurol 2007. [DOI: 10.1055/s-2007-987594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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38
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Wansing M, Holtbernd F, Bachmann R, Deppe M, Reilmann R. Objective assessment of motor dysfunction in ALS using grip force and 3D position analysis – new biomarkers for clinical studies? Akt Neurol 2007. [DOI: 10.1055/s-2007-987974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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39
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Holtbernd F, Wansing M, Bachmann R, Deppe M, Ringelstein EB, Reilmann R. Assessment of motor phenotype in Multiple Sclerosis using a force plate – a new biomarker for clinical studies? Akt Neurol 2007. [DOI: 10.1055/s-2007-987992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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40
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Ortloff C, Deppe M, Schill WB, Sánchez R. A new technique to evaluate the ability of cryoprotectors to prevent premature acrosome reaction in human spermatozoa. Andrologia 2006; 38:230-2. [PMID: 17081176 DOI: 10.1111/j.1439-0272.2006.00746.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Acrosome reaction (AR) induced by low temperature has been used to evaluate sperm function; it correlates adequately with the fertilization percentages in vitro. In this study, the technique of AR induction by low temperature was used to evaluate the effect in the protection of the acrosome by cryopreservatives normally used in human semen cryopreservation. Donor sperm selected by use of the migration sedimentation technique was incubated in human tubal fluid medium, added to dimethyl sulphoxide 1 m, ethylene glycol 0.75 m, glycerol 1 m, incubated at 4 degrees C and 20 degrees C (as a control) for 18 h, and then for 3 h at 37 degrees C in a cell incubator. The AR was evaluated by triple stain in 100 viable spermatozoa. The effect of cryopreservatives on acrosome preservation in samples incubated for 18 h at 4 degrees C was as follows: 78% intact acrosome for glycerol, 77.8% intact acrosome for dimethyl sulphoxide and 96.2% intact acrosome for ethylene glycol (P < 0.0025 compared with glycerol and dimethyl-sulphoxide). The sperm samples incubated with cryopreservatives for 18 h at 20 degrees C did not show an increase in the percentage of AR in samples incubated with glycerol and ethylene glycol, while a significant variation was observed in the sample incubated with dimethyl sulphoxide (P < 0.001). Additional incubation for 3 h at 37 degrees C significantly increased the AR only in the sample incubated with glycerol (P < 0.001). Acrosome preservation is essential in the fertilization process and the evaluation of acrosome reaction induction by low temperature test was satisfactory. This test proves that ethylene glycol presents a greater protective effect on the acrosome preservation of human spermatozoa.
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Affiliation(s)
- C Ortloff
- Centre for Reproductive Biotechnology, Universidad de La Frontera, Temuco, Chile
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41
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Yuan HQ, Grosche FM, Deppe M, Sparn G, Geibel C, Steglich F. Non-Fermi liquid states in the pressurized CeCu2(Si1-xGex)2 system: two critical points. Phys Rev Lett 2006; 96:047008. [PMID: 16486879 DOI: 10.1103/physrevlett.96.047008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2005] [Indexed: 05/06/2023]
Abstract
In the archetypal strongly correlated electron superconductor CeCu2Si2 and its Ge-substituted alloys CeCu2(Si1-xGex)2 two quantum phase transitions--one magnetic and one of so far unknown origin-can be crossed as a function of pressure. We examine the associated anomalous normal state by detailed measurements of the low temperature resistivity (rho) power-law exponent alpha. At the lower critical point (at pcl, 1<or=alpha<or=1.5) alpha depends strongly on Ge concentration x and thereby on disorder level, consistent with a Hlubina-Rice-Rosch scenario of critical scattering off antiferromagnetic fluctuations. By contrast, alpha is independent of x at the upper quantum phase transition (at pc2, alpha approximately equal to 1), suggesting critical scattering from local or q=0 modes, in agreement with a density- or valence-fluctuation approach.
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Affiliation(s)
- H Q Yuan
- Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany.
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Wansing M, Holtbernd F, Bohlen S, Kirsten F, Bachmann R, Deppe M, Reilmann R. Assessment of isometric tongue forces – an objective and quantitative surrogate marker for amyotrophic lateral sclerosis? Akt Neurol 2006. [DOI: 10.1055/s-2006-953335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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44
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Menke R, Kugel H, Deppe M, Baumgärtner A, Jansen A, Schiffbauer H, Schomacher M, Knecht S, Breitenstein C. Neural substrates of word recovery in chronic poststroke aphasia: an fMRI study. Akt Neurol 2006. [DOI: 10.1055/s-2006-953130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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45
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Ritter M, Deppe M, Püschel J, Nabavi D, Allroggen A, Dittrich R, Ringelstein E. TCD-profiling. Evaluation beyond the human eye of transcranial Doppler ultrasound flow spectra in subjects with cerebral microangiopathy and controls using AVERAGE. Akt Neurol 2006. [DOI: 10.1055/s-2006-953366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Deppe M, Schwindt W, Krämer J, Kugel H, Plassmann H, Kenning P, Ringelstein EB. Evidence for a neural correlate of a framing effect: Bias-specific activity in the ventromedial prefrontal cortex during credibility judgments. Brain Res Bull 2005; 67:413-21. [PMID: 16216688 DOI: 10.1016/j.brainresbull.2005.06.017] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Neural processes within the medial prefrontal cortex play a crucial role in assessing and integrating emotional and other implicit information during decision-making. Phylogenetically, it was important for the individual to assess the relevance of all kinds of environmental stimuli in order to adapt behavior in a flexible manner. Consequently, we can in principle not exclude that environmental information covertly influences the evaluation of actually decision relevant facts ("framing effect"). OBJECTIVE To test the hypothesis that the medial prefrontal cortex is involved into a framing effect we employed functional magnetic resonance imaging (fMRI) during a binary credibility judgment task. METHODS Twenty-one subjects were asked to judge 30 normalized news magazine headlines by forced answers as "true" or "false". To confound the judgments by formally irrelevant framing information we presented each of the headlines in four different news magazines characterized by varying credibility. For each subject the susceptibility to the judgment confounder (framing information) was assessed by magazine-specific modifications of the answers given. RESULTS We could show that individual activity changes of the ventromedial prefrontal cortex during the judgments correlate with the degree of an individual's susceptibility to the framing information. CONCLUSION We found (i) a neural correlate of a framing effect as postulated by behavioral decision theorists that (ii) reflects interindividual differences in the degree of the susceptibility to framing information.
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Affiliation(s)
- M Deppe
- Department of Neurology, University of Muenster and University Hospital Muenster (UKM), Albert-Schweitzer-Str. 33, D-48129 Muenster, Germany.
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Knecht S, Sommer J, Deppe M, Steinsträter O. Scalp position and efficacy of transcranial magnetic stimulation. Clin Neurophysiol 2005; 116:1988-93. [PMID: 15979404 DOI: 10.1016/j.clinph.2005.04.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2004] [Revised: 04/14/2005] [Accepted: 04/17/2005] [Indexed: 02/04/2023]
Abstract
OBJECTIVE To assess the impact of the scalp site on the biological effects of TMS. METHODS We performed high-resolution, three-dimensional whole head magnetic resonance imaging (MRI) in a healthy subject, systematically measured the scalp-to-cortex distance across the head and calculated the resulting electric field in the superficial cortex. RESULTS The variability in scalp-to-cortex distance led to differences in calculated cortical electric field strengths of a factor of two. A major portion of this variability was explained by a lateral to medial gradient with scalp-to-cortex distances being greatest close to the midline and smallest towards the temporal coordinates. CONCLUSIONS Because of the medio-lateral gradient in scalp-to-cortex distance interventions tailored on the basis of effects of TMS in the motor system will systematically induce stronger than expected electric currents when performed laterally to the motor spot. SIGNIFICANCE The biological effects of TMS outside the motor spot may be markedly different from those observed in the motor system and this should be taken into account to optimize TMS for the evaluation or treatment of neuropsychiatric disorders.
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Affiliation(s)
- S Knecht
- Department of Neurology, University of Münster, Albert-Schweitzer-Strasse 33, D-48129 Münster, Germany.
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Schwindt W, Deppe M, Kugel H, Plaßmann H, Kenning P. Nichtlineare Aktivierungskorrelate der Präferenz bei ökonomischen Entscheidungen im ventromedialen präfrontalen Kortex. ROFO-FORTSCHR RONTG 2005. [DOI: 10.1055/s-2005-868338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Schwindt W, Deppe M, Kugel H, Plassmann H, Kenning P. Non-linear correlates of preference in the ventromedial prefrontal cortex during economical decision making. ROFO-FORTSCHR RONTG 2005. [DOI: 10.1055/s-2005-865256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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50
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Lohmann H, Dräger B, Müller-Ehrenberg S, Deppe M, Knecht S. Language lateralization in young children assessed by functional transcranial Doppler sonography. Neuroimage 2005; 24:780-90. [PMID: 15652313 DOI: 10.1016/j.neuroimage.2004.08.053] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2004] [Revised: 08/06/2004] [Accepted: 08/23/2004] [Indexed: 11/17/2022] Open
Abstract
Compared to adults, children show superior recovery of language function after damage to the dominant brain hemisphere. Possible explanations are that children have different patterns of language representation or display different patterns of reorganization. Information about language lateralization in children could provide insights into the repair mechanisms of the young brain. While functional magnetic resonance imaging (fMRI) is usually difficult to perform in children younger than 5 years, functional transcranial Doppler sonography (fTCD) is nonfrightening and readily applicable in young and very young children. However, for serial examinations, sufficient validity and reliability are required. To this end, we designed a picture-description language task (PDLT) for fTCD examinations in children, compared the outcome to established protocols and determined the 1 month retest-reliability of the measurement in 16 children aged 2-9 years. The dependent variable was the task-related hemispheric perfusion difference based on averaged relative cerebral blood flow velocity (CBFV) increases in the middle cerebral arteries. This picture-description language lateralization index was compared to language lateralization by a phonetic word generation task (PWGT) in adults revealing good intermethod validity (r=0.70; P <or= 0.05). The 1 month retest-reliability of the PDLT in the children was r=0.87 (P <or= 0.05). With this degree of reliability, fTCD seems a promising tool for the assessment of changes in hemispheric involvement in language in young and very young children.
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Affiliation(s)
- H Lohmann
- Department of Neurology, University of Münster, Germany.
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