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Schneckmann R, Döring M, Gerfer S, Gorressen S, Heitmeier S, Helten C, Polzin A, Jung C, Kelm M, Fender AC, Flögel U, Grandoch M. Rivaroxaban attenuates neutrophil maturation in the bone marrow niche. Basic Res Cardiol 2023; 118:31. [PMID: 37580509 PMCID: PMC10425524 DOI: 10.1007/s00395-023-01001-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/16/2023]
Abstract
Pharmacological inhibition of factor Xa by rivaroxaban has been shown to mediate cardioprotection and is frequently used in patients with, e.g., atrial fibrillation. Rivaroxaban's anti-inflammatory actions are well known, but the underlying mechanisms are still incompletely understood. To date, no study has focused on the effects of rivaroxaban on the bone marrow (BM), despite growing evidence that the BM and its activation are of major importance in the development/progression of cardiovascular disease. Thus, we examined the impact of rivaroxaban on BM composition under homeostatic conditions and in response to a major cardiovascular event. Rivaroxaban treatment of mice for 7 days markedly diminished mature leukocytes in the BM. While apoptosis of BM-derived mature myeloid leukocytes was unaffected, lineage-negative BM cells exhibited a differentiation arrest at the level of granulocyte-monocyte progenitors, specifically affecting neutrophil maturation via downregulation of the transcription factors Spi1 and Csfr1. To assess whether this persists also in situations of increased leukocyte demand, mice were subjected to cardiac ischemia/reperfusion injury (I/R): 7 d pretreatment with rivaroxaban led to reduced cardiac inflammation 72 h after I/R and lowered circulating leukocyte numbers. However, BM myelopoiesis showed a rescue of the leukocyte differentiation arrest, indicating that rivaroxaban's inhibitory effects are restricted to homeostatic conditions and are mainly abolished during emergency hematopoiesis. In translation, ST-elevation MI patients treated with rivaroxaban also exhibited reduced circulating leukocyte numbers. In conclusion, we demonstrate that rivaroxaban attenuates neutrophil maturation in the BM, which may offer a therapeutic option to limit overshooting of the immune response after I/R.
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Affiliation(s)
- R Schneckmann
- Institute for Translational Pharmacology Düsseldorf, Medical Faculty, University Hospital of the Heinrich Heine University, Universitätsstr. 1, 40225, Düsseldorf, Germany
| | - M Döring
- Institute for Translational Pharmacology Düsseldorf, Medical Faculty, University Hospital of the Heinrich Heine University, Universitätsstr. 1, 40225, Düsseldorf, Germany
| | - S Gerfer
- Department of Cardiothoracic Surgery, Heart Center of the University Hospital of Cologne, Cologne, Germany
| | - S Gorressen
- Institute for Pharmacology Düsseldorf, Medical Faculty, University Hospital and Heinrich Heine University, Düsseldorf, Germany
| | - S Heitmeier
- Research & Development Pharmaceuticals, Bayer AG, Acute Hospital Research, Wuppertal, Germany
| | - C Helten
- Department for Cardiology, Pneumology and Vascular Medicine, University Hospital and Heinrich Heine University, Düsseldorf, Germany
| | - A Polzin
- Department for Cardiology, Pneumology and Vascular Medicine, University Hospital and Heinrich Heine University, Düsseldorf, Germany
- CARID, Cardiovascular Research Institute Düsseldorf, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
| | - C Jung
- Department for Cardiology, Pneumology and Vascular Medicine, University Hospital and Heinrich Heine University, Düsseldorf, Germany
- CARID, Cardiovascular Research Institute Düsseldorf, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
| | - M Kelm
- Department for Cardiology, Pneumology and Vascular Medicine, University Hospital and Heinrich Heine University, Düsseldorf, Germany
- CARID, Cardiovascular Research Institute Düsseldorf, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
| | - A C Fender
- Institute of Pharmacology, University Hospital, University Duisburg-Essen, Essen, Germany
| | - U Flögel
- CARID, Cardiovascular Research Institute Düsseldorf, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
- Experimental Cardiovascular Imaging, Institute for Molecular Cardiology, University Hospital and Heinrich Heine University, Düsseldorf, Germany
| | - M Grandoch
- Institute for Translational Pharmacology Düsseldorf, Medical Faculty, University Hospital of the Heinrich Heine University, Universitätsstr. 1, 40225, Düsseldorf, Germany.
- CARID, Cardiovascular Research Institute Düsseldorf, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany.
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le Roux MM, Miller JT, Waller J, Döring M, Bruneau A. An expert curated global legume checklist improves the accuracy of occurrence, biodiversity and taxonomic data. Sci Data 2022; 9:708. [PMID: 36396659 PMCID: PMC9672059 DOI: 10.1038/s41597-022-01812-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 10/27/2022] [Indexed: 11/18/2022] Open
Abstract
The Legume Phylogeny Working Group’s Taxonomy Working Group was tasked to create a community endorsed global legume checklist that will serve as a primary source of taxa for biodiversity data platforms and legume-related research. The checklist was published in June 2021, recognising 772 genera and 22,360 species. It is disseminated through the new Legume Data Portal as part of the Global Biodiversity Information Facility (GBIF) hosted portal initiative. The process that was followed to publish and disseminate the checklist and its content is described here. The impact of the work by the Taxonomy Working Group are quantified by comparing the published checklist with the GBIF taxonomic backbone. A total of 44,157 names overlapped with the GBIF taxonomic backbone while 30,456 names were added, which enabled more accurate name matching of 61,235 legume occurrences. Continuous improvement to the World Checklist of Vascular Plants (WCVP): Fabaceae checklist will allow the GBIF taxonomic backbone and other checklist managers to converge to a consistent and comprehensive list of legume taxa globally over time. Measurement(s) | Corrections and impact | Technology Type(s) | Data comparisons | Factor Type(s) | taxon name | Sample Characteristic - Organism | Fabaceae | Sample Characteristic - Environment | global |
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Agosti D, Benichou L, Addink W, Arvanitidis C, Catapano T, Cochrane G, Dillen M, Döring M, Georgiev T, Gérard I, Groom Q, Kishor P, Kroh A, Kvaček J, Mergen P, Mietchen D, Pauperio J, Sautter G, Penev L. Recommendations for use of annotations and persistent identifiers in taxonomy and biodiversity publishing. RIO 2022. [DOI: 10.3897/rio.8.e97374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The paper summarises many years of discussions and experience of biodiversity publishers, organisations, research projects and individual researchers, and proposes recommendations for implementation of persistent identifiers for article metadata, structural elements (sections, subsections, figures, tables, references, supplementary materials and others) and data specific to biodiversity (taxonomic treatments, treatment citations, taxon names, material citations, gene sequences, specimens, scientific collections) in taxonomy and biodiversity publishing. The paper proposes best practices on how identifiers should be used in the different cases and on how they can be minted, cited, and expressed in the backend article XML to facilitate conversion to and further re-use of the article content as FAIR data. The paper also discusses several specific routes for post-publication re-use of semantically enhanced content through large biodiversity data aggregators such as the Global Biodiversity Information Facility (GBIF), the International Nucleotide Sequence Database Collaboration (INSDC) and others, and proposes specifications of both identifiers and XML tags to be used for that purpose. A summary table provides an account and overview of the recommendations. The guidelines are supported with examples from the existing publishing practices.
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Wegener D, Lang P, Paulsen F, Weidner N, Zips D, Ebinger M, Holzer U, Döring M, Heinzelmann F. Primary immunosuppressive TNI-based conditioning regimens in pediatric patients treated with haploidentical hematopoietic cell transplantation. Strahlenther Onkol 2021; 198:66-72. [PMID: 34476532 PMCID: PMC8760200 DOI: 10.1007/s00066-021-01840-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 08/09/2021] [Indexed: 11/28/2022]
Abstract
PURPOSE This retrospective analysis aims to address the toxicity and efficacy of a modified total nodal irradiation (TNI)-based conditioning regimen before haploidentical hematopoietic cell transplantation (HCT) in pediatric patients. MATERIALS AND METHODS Patient data including long-term follow-up were evaluated of 7 pediatric patients with malignant (n = 2) and non-malignant diseases (n = 5) who were treated by a primary TNI-based conditioning regimen. TNI was performed using anterior/posterior opposing fields. All patients received 7 Gy single-dose TNI combined with systemic agents followed by an infusion of peripheral blood stem cells (n = 7). All children had haploidentical family donors. RESULTS Engraftment was reached in 6/7 children after a median time of 9.5 days; 1 child had primary graft failure but was successfully reconditioned shortly thereafter. After an average follow-up time of 103.5 months (range 8.8-138.5 months), event-free (EFS) and overall survival (OS) rates were 71.4% and 85.7%, respectively. One child with a non-malignant disease died 8.8 months after transplantation due to a relapse and a multiple organ failure. Follow-up data was available for 5/6 long-term survivors with a median follow-up (FU) of 106.2 months (range 54.5-138.5 months). Hypothyroidism and deficiency of sexual hormones was present in 3/5 patients each. Mean forced expiratory volume in 1 s (FEV1) after TNI was 71%; mean vital capacity (VC) was 78%. Growth failure (< 10th percentile) occurred in 2/5 patients (height) and 1/5 patient (weight). No secondary malignancies were reported. CONCLUSION In this group of patients, a primary single-dose 7 Gy TNI-based conditioning regimen before HCT in pediatric patients allowed sustained engraftment combined with a tolerable toxicity profile leading to long-term OS/EFS. Late toxicity after a median FU of over 9 years includes growth failure, manageable hormonal deficiencies, and acceptable decrease in lung function.
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Affiliation(s)
- D Wegener
- Department of Radiation Oncology, University Clinic of Tuebingen, Tuebingen, Germany.
| | - P Lang
- Department of Paediatrics I, Hematology and Oncology, University Clinic of Tuebingen, Tuebingen, Germany
| | - F Paulsen
- Department of Radiation Oncology, University Clinic of Tuebingen, Tuebingen, Germany
| | - N Weidner
- Department of Radiation Oncology, University Clinic of Tuebingen, Tuebingen, Germany
| | - D Zips
- Department of Radiation Oncology, University Clinic of Tuebingen, Tuebingen, Germany
| | - M Ebinger
- Department of Paediatrics I, Hematology and Oncology, University Clinic of Tuebingen, Tuebingen, Germany
| | - U Holzer
- Department of Paediatrics I, Hematology and Oncology, University Clinic of Tuebingen, Tuebingen, Germany
| | - M Döring
- Department of Paediatrics I, Hematology and Oncology, University Clinic of Tuebingen, Tuebingen, Germany
| | - F Heinzelmann
- Department of Radiation Oncology, Clinic of Esslingen, Esslingen, Germany
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Löbe S, Paetsch I, Hilbert S, Spampinato R, Oebel S, Richter S, Döring M, Sommer P, Bollmann A, Hindricks G, Jahnke C. Evaluation of the right heart using cardiovascular magnetic resonance imaging in patients with cardiac devices. Int J Cardiol 2020; 316:266-271. [PMID: 32389768 DOI: 10.1016/j.ijcard.2020.05.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 03/08/2020] [Accepted: 05/06/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND Patients with cardiac implantable electronic devices (CIED) necessitate comprehensive cardiovascular magnetic resonance (CMR) examinations. The aim of this study was to provide data on CMR image quality and feasibility of functional assessment of the right heart in patients with CIED depending on the device type and imaging sequence used. METHODS 120 CIED carriers (Insertable cardiac monitoring system, n = 13; implantable loop-recorder, n = 22; pacemaker, n = 30; implantable cardioverter-defibrillator (ICD), n = 43; and cardiac resynchronization therapy defibrillator (CRT-D), n = 12) underwent clinically indicated CMR imaging using a 1.5 T. CMR protocols consisted of cine imaging and myocardial tissue characterization including T1-and T2-weighted blackblood imaging and late gadolinium enhancement (LGE) imaging. Image quality was evaluated with regard to device-related imaging artifacts per right-ventricular (RV) segment. RESULTS RV segmental evaluability was influenced by the device type and CMR imaging sequence: Cine steady-state-free-precision (SSFP) imaging was found to be non-diagnostic in patients with ICD/CRT-D and implantable loop recorders; a significant improvement of image quality was achieved when using cine turbo-field-echo (TFE) sequences with a further improvement on post-contrast TFE imaging. LGE scans were artifact-free in at least 91% of RV segments with best results in patients with a pacemaker or an insertable cardiac monitoring system. CONCLUSIONS In patients with CIED, artifact-free CMR imaging of the right ventricle was performed in the majority of patients and resulted in highly reproducible evaluability of RV functional parameters. This finding is of particular importance for the diagnosis and follow-up of right-ventricular diseases.
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Affiliation(s)
- S Löbe
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany.
| | - I Paetsch
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany
| | - S Hilbert
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany
| | - R Spampinato
- Department of Cardiac Surgery, HELIOS Heart Center Leipzig, University of Leipzig, Germany
| | - S Oebel
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany
| | - S Richter
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany
| | - M Döring
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany
| | - P Sommer
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany
| | - A Bollmann
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany; Leipzig Heart Institute, Leipzig, Germany
| | - G Hindricks
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany; Leipzig Heart Institute, Leipzig, Germany
| | - C Jahnke
- Department of Electrophysiology, HELIOS Heart Center Leipzig, University of Leipzig, Germany
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7
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Ireland DG, Döring M, Glazier DI, Haidenbauer J, Mai M, Murray-Smith R, Rönchen D. Kaon Photoproduction and the Λ Decay Parameter α_{-}. Phys Rev Lett 2019; 123:182301. [PMID: 31763878 DOI: 10.1103/physrevlett.123.182301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 09/09/2019] [Indexed: 06/10/2023]
Abstract
The weak decay parameter α_{-} of the Λ is an important quantity for the extraction of polarization observables in various experiments. Moreover, in combination with α_{+} from Λ[over ¯] decay it provides a measure for matter-antimatter asymmetry. The weak decay parameter also affects the decay parameters of the Ξ and Ω baryons and, in general, any quantity in which the polarization of the Λ is relevant. The recently reported value by the BESIII Collaboration of 0.750(9)(4) is significantly larger than the previous PDG value of 0.642(13) that had been accepted and used for over 40 years. In this work we make an independent estimate of α_{-}, using an extensive set of polarization data measured in kaon photoproduction in the baryon resonance region and constraints set by spin algebra. The obtained value is 0.721(6)(5). The result is corroborated by multiple statistical tests as well as a modern phenomenological model, showing that our new value yields the best description of the data in question. Our analysis supports the new BESIII finding that α_{-} is significantly larger than the previous PDG value. Any experimental quantity relying on the value of α_{-} should therefore be reconsidered.
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Affiliation(s)
- D G Ireland
- SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - M Döring
- Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, D.C. 20052, USA
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - D I Glazier
- SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - J Haidenbauer
- Institute for Advanced Simulation, Institut für Kernphysik (Theorie) and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - M Mai
- Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, D.C. 20052, USA
| | - R Murray-Smith
- School of Computing Science, University of Glasgow, Glasgow G12 8RZ, United Kingdom
| | - D Rönchen
- Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany
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8
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Fage J, Knoll K, Niessner N, Carstensen O, Schulz T, Malz F, Döring M, Schönberger F. Poly (Butyl Acrylate)-Graft-Polystyrene Synthesis by Free-Radical Polymerization: Interplay between Structure, Morphology, Mechanical, and Optical Properties. Polymers (Basel) 2019; 11:polym11081317. [PMID: 31394724 PMCID: PMC6722744 DOI: 10.3390/polym11081317] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 07/29/2019] [Accepted: 08/03/2019] [Indexed: 11/16/2022] Open
Abstract
We report a new method of preparation of poly (butyl acrylate)-g-polystyrene/polystyrene blends by free-radical polymerization. Copolymerization of glycidyl (meth)acrylate with butyl acrylate is followed by a polymer analogous reaction of this copolymer with acrylic acid and subsequent copolymerization of the modified backbone with styrene. Investigation on the number of reactive groups per backbone chain and its molecular weight allows grafting efficiencies of about 35% to be reached, as well as low cross-linking. Blends of nanophase-separated copolymers having a backbone with Mn of around 50 kg/mol and 4 reactive groups per chain are transparent, with haze as low as 14%, tensile strength of around 22 MPa, and elongations at the break of around 3%. Correlation between morphology determined by transmission electron microscopy and properties of the blend is established.
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Affiliation(s)
- J Fage
- Fraunhofer Institute for Structural Durability and System Reliability, Plastics Division, Schlossgartenstrasse 6, 64289 Darmstadt, Germany
| | - K Knoll
- BASF SE, Carl-Bosch-Straße 38, 67063 Ludwigshafen am Rhein, Germany
| | - N Niessner
- INEOS Styrolution Group GmbH, Mainzer Landstrasse 50, 60325 Frankfurt am Main, Germany
| | - O Carstensen
- INEOS Styrolution Group GmbH, Mainzer Landstrasse 50, 60325 Frankfurt am Main, Germany
| | - T Schulz
- LANXESS Deutschland GmbH, Chempark Leverkusen, Gebäude R14, 51369 Leverkusen, Germany
| | - F Malz
- Fraunhofer Institute for Structural Durability and System Reliability, Plastics Division, Schlossgartenstrasse 6, 64289 Darmstadt, Germany
| | - M Döring
- Fraunhofer Institute for Structural Durability and System Reliability, Plastics Division, Schlossgartenstrasse 6, 64289 Darmstadt, Germany
| | - F Schönberger
- Fraunhofer Institute for Structural Durability and System Reliability, Plastics Division, Schlossgartenstrasse 6, 64289 Darmstadt, Germany.
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Mai M, Döring M. Finite-Volume Spectrum of π^{+}π^{+} and π^{+}π^{+}π^{+} Systems. Phys Rev Lett 2019; 122:062503. [PMID: 30822051 DOI: 10.1103/physrevlett.122.062503] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 01/14/2019] [Indexed: 06/09/2023]
Abstract
The ab initio understanding of hadronic three-body systems above threshold, such as exotic resonances or the baryon spectrum, requires the mapping of the finite-volume eigenvalue spectrum, produced in lattice QCD calculations, to the infinite volume. We present the first application of such a formalism to a physical system in form of three interacting positively charged pions. The results for the ground state energies agree with the available lattice QCD results by the NPLQCD collaboration at unphysical pion masses. Extrapolations to physical pion masses are performed using input from effective field theory. The excited energy spectrum is predicted. This demonstrates the feasibility to determine three-body amplitudes above threshold from lattice QCD, including resonance properties of axial mesons, exotics, and excited baryons.
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Affiliation(s)
- M Mai
- Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA
| | - M Döring
- Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
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Dörschner M, Bollmann A, Dinov B, Richter S, Döring M, Arya A, Müssigbrodt A, Kircher S, Dagres N, Sommer P, Hindricks G, Bode K. Structured pain management reduces patient discomfort after catheter ablation and rhythm device surgery. Eur J Pain 2017; 21:1723-1731. [DOI: 10.1002/ejp.1084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2017] [Indexed: 01/23/2023]
Affiliation(s)
| | - A. Bollmann
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - B. Dinov
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - S. Richter
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - M. Döring
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - A. Arya
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - A. Müssigbrodt
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - S. Kircher
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - N. Dagres
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - P. Sommer
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - G. Hindricks
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
| | - K. Bode
- Department of Electrophysiology; Heart Center Leipzig; University of Leipzig; Germany
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Müssigbrodt A, Weber A, Mandrola J, van Belle Y, Richter S, Döring M, Arya A, Sommer P, Bollmann A, Hindricks G. Excess of exercise increases the risk of atrial fibrillation. Scand J Med Sci Sports 2017; 27:910-917. [PMID: 28090681 DOI: 10.1111/sms.12830] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2016] [Indexed: 01/02/2023]
Abstract
An interesting and still not well-understood example for old medical wisdom "Sola dosis facit venenum" is the increased prevalence of atrial fibrillation (AF) in athletes. Numerous studies have shown a fourfold to eightfold increased risk of AF in athletes compared to the normal population. Analysis of the existing data suggests a dose-dependent effect of exercise. Moderate exercise seems to have a protective effect and decreases the risk of AF, whereas excessive exercise seems to increase the risk of AF. The described cases illustrate clinical manifestations within the spectrum of AF in elderly athletes, that is, exercise-induced AF, vagal AF, chronic AF, and atrial flutter. As the arrhythmia worsened quality of life and exercise capacity in all patients, recovery of sinus rhythm was desired in all described cases. As the atrial disease was advanced on different levels, different treatment regimes were applied. Lifestyle modification and temporary anti-arrhythmic drug therapy could stabilize sinus rhythm in one patient, whereas others needed radiofrequency ablation to achieve a stable sinus rhythm. The patient with the most advanced atrial disease necessitated anti-arrhythmic drug therapy and another left atrial ablation. All described patients remained in sinus rhythm during the long-term follow-up.
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Affiliation(s)
- A Müssigbrodt
- Department of Electrophysiology, University of Leipzig, Heart Centre, Leipzig, Germany
| | - A Weber
- Department of Electrophysiology, University of Leipzig, Heart Centre, Leipzig, Germany
| | - J Mandrola
- Baptist Health Louisville, Louisville, KY, USA
| | - Y van Belle
- Centre Hospitalier Universitaire, Liège, Belgium
| | - S Richter
- Department of Electrophysiology, University of Leipzig, Heart Centre, Leipzig, Germany
| | - M Döring
- Department of Electrophysiology, University of Leipzig, Heart Centre, Leipzig, Germany
| | - A Arya
- Department of Electrophysiology, University of Leipzig, Heart Centre, Leipzig, Germany
| | - P Sommer
- Department of Electrophysiology, University of Leipzig, Heart Centre, Leipzig, Germany
| | - A Bollmann
- Department of Electrophysiology, University of Leipzig, Heart Centre, Leipzig, Germany
| | - G Hindricks
- Department of Electrophysiology, University of Leipzig, Heart Centre, Leipzig, Germany
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12
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Droege G, Barker K, Seberg O, Coddington J, Benson E, Berendsohn WG, Bunk B, Butler C, Cawsey EM, Deck J, Döring M, Flemons P, Gemeinholzer B, Güntsch A, Hollowell T, Kelbert P, Kostadinov I, Kottmann R, Lawlor RT, Lyal C, Mackenzie-Dodds J, Meyer C, Mulcahy D, Nussbeck SY, O'Tuama É, Orrell T, Petersen G, Robertson T, Söhngen C, Whitacre J, Wieczorek J, Yilmaz P, Zetzsche H, Zhang Y, Zhou X. The Global Genome Biodiversity Network (GGBN) Data Standard specification. Database (Oxford) 2016; 2016:baw125. [PMID: 27694206 PMCID: PMC5045859 DOI: 10.1093/database/baw125] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 08/09/2016] [Indexed: 11/24/2022]
Abstract
Genomic samples of non-model organisms are becoming increasingly important in a broad range of studies from developmental biology, biodiversity analyses, to conservation. Genomic sample definition, description, quality, voucher information and metadata all need to be digitized and disseminated across scientific communities. This information needs to be concise and consistent in today’s ever-increasing bioinformatic era, for complementary data aggregators to easily map databases to one another. In order to facilitate exchange of information on genomic samples and their derived data, the Global Genome Biodiversity Network (GGBN) Data Standard is intended to provide a platform based on a documented agreement to promote the efficient sharing and usage of genomic sample material and associated specimen information in a consistent way. The new data standard presented here build upon existing standards commonly used within the community extending them with the capability to exchange data on tissue, environmental and DNA sample as well as sequences. The GGBN Data Standard will reveal and democratize the hidden contents of biodiversity biobanks, for the convenience of everyone in the wider biobanking community. Technical tools exist for data providers to easily map their databases to the standard. Database URL:http://terms.tdwg.org/wiki/GGBN_Data_Standard
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Affiliation(s)
- G Droege
- Botanic Garden and Botanical Museum Berlin-Dahlem, Freie Universität Berlin, Königin-Luise-Str. 6-8, Berlin 14195, Germany
| | - K Barker
- National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - O Seberg
- Natural History Museum of Denmark, University of Copenhagen, Sølvgade 83, opg. S, Copenhagen DK-1307, Denmark
| | - J Coddington
- National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - E Benson
- Damar Research Scientists, Damar, Drum Road, Cuparmuir, Fife KY15 5RJ, UK
| | - W G Berendsohn
- Botanic Garden and Botanical Museum Berlin-Dahlem, Freie Universität Berlin, Königin-Luise-Str. 6-8, Berlin 14195, Germany
| | - B Bunk
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstr. 7B, Braunschweig 38124, Germany
| | - C Butler
- National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - E M Cawsey
- Australian National Wildlife Collection, CSIRO National Research Collections Australia, Canberra, Australia
| | - J Deck
- Berkeley Natural History Museums, University of California at Berkeley, Berkeley, CA 94720, USA
| | - M Döring
- Global Biodiversity Information Facility Secretariat, Universitetsparken 15, Copenhagen DK-2100, Denmark
| | - P Flemons
- Australian Museum, Sydney 2010, NSW, Australia
| | - B Gemeinholzer
- Systematic Botany, Justus Liebig University, Giessen 35392, Germany
| | - A Güntsch
- Botanic Garden and Botanical Museum Berlin-Dahlem, Freie Universität Berlin, Königin-Luise-Str. 6-8, Berlin 14195, Germany
| | - T Hollowell
- National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - P Kelbert
- Botanic Garden and Botanical Museum Berlin-Dahlem, Freie Universität Berlin, Königin-Luise-Str. 6-8, Berlin 14195, Germany
| | - I Kostadinov
- Department of Life Sciences & Chemistry, Jacobs University Bremen gGmbH, Campus Ring 1, Bremen 28759, Germany
| | - R Kottmann
- Microbial Genomics and Bioinformatics Research Group, Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, Bremen 28359, Germany
| | - R T Lawlor
- ARC-Net Applied Research on Cancer Centre, Department of Pathology and Diagnostics, University of Verona, Verona 37134, Italy
| | - C Lyal
- Natural History Museum, Cromwell Road, London SW7 5BD, UK
| | | | - C Meyer
- National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - D Mulcahy
- National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - S Y Nussbeck
- Department of Medical Informatics and UMG Biobank, University Medical Center Göttingen, Robert-Koch-Str. 40, Göttingen 37075, Germany
| | - É O'Tuama
- Global Biodiversity Information Facility Secretariat, Universitetsparken 15, Copenhagen DK-2100, Denmark
| | - T Orrell
- National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - G Petersen
- Natural History Museum of Denmark, University of Copenhagen, Sølvgade 83, opg. S, Copenhagen DK-1307, Denmark
| | - T Robertson
- Global Biodiversity Information Facility Secretariat, Universitetsparken 15, Copenhagen DK-2100, Denmark
| | - C Söhngen
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstr. 7B, Braunschweig 38124, Germany
| | - J Whitacre
- National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - J Wieczorek
- Museum of Vertebrate Zoology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - P Yilmaz
- Microbial Genomics and Bioinformatics Research Group, Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, Bremen 28359, Germany
| | - H Zetzsche
- Julius Kuehn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Resistance Research and Stress Tolerance, Erwin-Baur-Str. 27, Quedlinburg 06484, Germany
| | - Y Zhang
- China National GeneBank, BGI-Shenzhen, Shenzhen, Guangdong 518083, China
| | - X Zhou
- China National GeneBank, BGI-Shenzhen, Shenzhen, Guangdong 518083, China
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Hu B, Molina R, Döring M, Alexandru A. Two-Flavor Simulations of ρ(770) and the Role of the KK[over ¯] Channel. Phys Rev Lett 2016; 117:122001. [PMID: 27689266 DOI: 10.1103/physrevlett.117.122001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Indexed: 06/06/2023]
Abstract
The ρ(770) meson is the most extensively studied resonance in lattice QCD simulations in two (N_{f}=2) and three (N_{f}=2+1) flavor formulations. We analyze N_{f}=2 lattice scattering data using unitarized chiral perturbation theory, allowing not only for the extrapolation in mass but also in flavor, N_{f}=2→N_{f}=2+1. The flavor extrapolation requires information from a global fit to ππ and πK phase shifts from experiment. While the chiral extrapolation of N_{f}=2 lattice data leads to masses of the ρ(770) meson far below the experimental one, we find that the missing KK[over ¯] channel is able to explain this discrepancy.
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Affiliation(s)
- B Hu
- The George Washington University, Washington, D.C. 20052, USA
| | - R Molina
- The George Washington University, Washington, D.C. 20052, USA
| | - M Döring
- The George Washington University, Washington, D.C. 20052, USA
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Alexandru
- The George Washington University, Washington, D.C. 20052, USA
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14
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Kleesiek J, Petersen J, Döring M, Maier-Hein K, Köthe U, Wick W, Hamprecht FA, Bendszus M, Biller A. Virtual Raters for Reproducible and Objective Assessments in Radiology. Sci Rep 2016; 6:25007. [PMID: 27118379 PMCID: PMC4846987 DOI: 10.1038/srep25007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 04/06/2016] [Indexed: 11/09/2022] Open
Abstract
Volumetric measurements in radiologic images are important for monitoring tumor growth and treatment response. To make these more reproducible and objective we introduce the concept of virtual raters (VRs). A virtual rater is obtained by combining knowledge of machine-learning algorithms trained with past annotations of multiple human raters with the instantaneous rating of one human expert. Thus, he is virtually guided by several experts. To evaluate the approach we perform experiments with multi-channel magnetic resonance imaging (MRI) data sets. Next to gross tumor volume (GTV) we also investigate subcategories like edema, contrast-enhancing and non-enhancing tumor. The first data set consists of N = 71 longitudinal follow-up scans of 15 patients suffering from glioblastoma (GB). The second data set comprises N = 30 scans of low- and high-grade gliomas. For comparison we computed Pearson Correlation, Intra-class Correlation Coefficient (ICC) and Dice score. Virtual raters always lead to an improvement w.r.t. inter- and intra-rater agreement. Comparing the 2D Response Assessment in Neuro-Oncology (RANO) measurements to the volumetric measurements of the virtual raters results in one-third of the cases in a deviating rating. Hence, we believe that our approach will have an impact on the evaluation of clinical studies as well as on routine imaging diagnostics.
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Affiliation(s)
- Jens Kleesiek
- University of Heidelberg, Department of Neuroradiology, Heidelberg, Germany.,German Cancer Research Center, Junior Group Medical Image Computing, Heidelberg, Germany.,University of Heidelberg, HCI/IWR, Heidelberg, Germany.,German Cancer Research Center, Division of Radiology, Heidelberg, Germany
| | - Jens Petersen
- University of Heidelberg, Department of Neuroradiology, Heidelberg, Germany.,German Cancer Research Center, Junior Group Medical Image Computing, Heidelberg, Germany
| | - Markus Döring
- University of Heidelberg, Department of Neuroradiology, Heidelberg, Germany
| | - Klaus Maier-Hein
- German Cancer Research Center, Junior Group Medical Image Computing, Heidelberg, Germany
| | - Ullrich Köthe
- University of Heidelberg, HCI/IWR, Heidelberg, Germany
| | - Wolfgang Wick
- University of Heidelberg, Department of Neurology, Heidelberg, Germany
| | | | - Martin Bendszus
- University of Heidelberg, Department of Neuroradiology, Heidelberg, Germany
| | - Armin Biller
- University of Heidelberg, Department of Neuroradiology, Heidelberg, Germany.,German Cancer Research Center, Division of Radiology, Heidelberg, Germany
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15
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Ramirez KS, Döring M, Eisenhauer N, Gardi C, Ladau J, Leff JW, Lentendu G, Lindo Z, Rillig MC, Russell D, Scheu S, St. John MG, de Vries FT, Wubet T, van der Putten WH, Wall DH. Toward a global platform for linking soil biodiversity data. Front Ecol Evol 2015. [DOI: 10.3389/fevo.2015.00091] [Citation(s) in RCA: 20] [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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16
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Urschel C, Döring M, Strecker W. [Cement-free and cemented Excia hip shaft prosthesis: comparison of intermediate term results]. Orthopade 2014; 43:815-24. [PMID: 25118680 DOI: 10.1007/s00132-014-3003-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM OF THE STUDY For fixation of total hip prostheses, cemented and cement-free techniques are available. Normally, anchoring techniques and the definitive endoprosthesis model are determined preoperatively based on the available information, such as the quality of bone. Some newer endoprosthesis models utilize the same instruments for both implantation techniques. In this way it is possible to decide on the final anchoring technique intraoperatively. Because such a combined endoprosthesis system has been used in our clinic for 10 years, we were interested in the clinical results at the intermediate stage. MATERIAL AND METHODS In a prospective, non-randomized study 105 pairs from a continuing series were formed from 105 cases treated with cement-free prostheses and the latest cemented shaft implants from the same year. In this way a total of 210 hip shaft endoprostheses from the years 2002 to 2006 were included in the study. After an average time period of 6.3 years (range 4.5-8.2 years) the patients were recalled for a follow-up examination. The clinical results, early and late complications were analyzed. The immediately postoperative X-ray images and those from the follow-up examination were evaluated by an independent external expert with respect to primary positioning, migration and any signs of loosening. RESULTS At the follow-up examination at an average of 6.3 years the quota was 73%. The indications for cement-free/cemented total hip endoprosthesis were: primary arthritis 87%/98%, secondary arthritis 10%/2% and others 3%/0%. At the time of the last follow-up examination 4 and 14 patients, respectively, had died. The visual analog scale (VAS) for pain was given as 0.72/0.78. The Harris hip score improved from 54/48 to 93/90 points. The implant-related survival rate was 99.5%. Due to a periprosthetic fracture one of the cemented shafts had to be removed. Luxation occurred in 3/2 cases, respectively, of which 4 could be conservatively treated. In one cement-free case a head elongation and a change to an inlay with an anti-luxation shoulder was necessary. A fracture of the trochanter major was conservatively treated and an intraoperative shaft fissure was stabilized with wire cerclage and titan banding. The radiological evaluation showed no implant loosening or statistically significant differences in the shaft positioning. DISCUSSION Short and intermediate clinical and radiological results showed no differences in patients of similar average age in the sixth decade of life. The significant improvements in the Harris hip score and the range of movement could be confirmed in the intermediate term and are comparable to other current implants. It can be concluded that an intraoperative decision on the fixation technique based on the macroscopically visible bone quality supports the reliably good results of both methods.
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Affiliation(s)
- C Urschel
- Klinik für Orthopädie und Unfallchirurgie, Sozialstiftung Bamberg, Klinikum am Bruderwald, Buger Straße 80, 96049, Bamberg, Deutschland,
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Robertson T, Döring M, Guralnick R, Bloom D, Wieczorek J, Braak K, Otegui J, Russell L, Desmet P. The GBIF integrated publishing toolkit: facilitating the efficient publishing of biodiversity data on the internet. PLoS One 2014; 9:e102623. [PMID: 25099149 PMCID: PMC4123864 DOI: 10.1371/journal.pone.0102623] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 06/20/2014] [Indexed: 11/30/2022] Open
Abstract
The planet is experiencing an ongoing global biodiversity crisis. Measuring the magnitude and rate of change more effectively requires access to organized, easily discoverable, and digitally-formatted biodiversity data, both legacy and new, from across the globe. Assembling this coherent digital representation of biodiversity requires the integration of data that have historically been analog, dispersed, and heterogeneous. The Integrated Publishing Toolkit (IPT) is a software package developed to support biodiversity dataset publication in a common format. The IPT’s two primary functions are to 1) encode existing species occurrence datasets and checklists, such as records from natural history collections or observations, in the Darwin Core standard to enhance interoperability of data, and 2) publish and archive data and metadata for broad use in a Darwin Core Archive, a set of files following a standard format. Here we discuss the key need for the IPT, how it has developed in response to community input, and how it continues to evolve to streamline and enhance the interoperability, discoverability, and mobilization of new data types beyond basic Darwin Core records. We close with a discussion how IPT has impacted the biodiversity research community, how it enhances data publishing in more traditional journal venues, along with new features implemented in the latest version of the IPT, and future plans for more enhancements.
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Affiliation(s)
- Tim Robertson
- Global Biodiversity Information Facility, Copenhagen, Denmark
| | - Markus Döring
- Global Biodiversity Information Facility, Copenhagen, Denmark
| | - Robert Guralnick
- University of Colorado, Boulder, Colorado, United States of America
| | - David Bloom
- University of California, Berkeley, Berkeley, California, United States of America
- * E-mail:
| | - John Wieczorek
- University of California, Berkeley, Berkeley, California, United States of America
| | - Kyle Braak
- Global Biodiversity Information Facility, Copenhagen, Denmark
| | - Javier Otegui
- University of Colorado, Boulder, Colorado, United States of America
| | - Laura Russell
- University of Kansas, Lawrence, Kansas, United States of America
| | - Peter Desmet
- Research Institute for Nature and Forest (INBO), Brussels, Belgium
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Wieczorek J, Bánki O, Blum S, Deck J, Döring M, Dröge G, Endresen D, Goldstein P, Leary P, Krishtalka L, Tuama ÉÓ, Robbins RJ, Robertson T, Yilmaz P. Meeting Report: GBIF hackathon-workshop on Darwin Core and sample data (22-24 May 2013). Stand Genomic Sci 2014. [PMCID: PMC4148965 DOI: 10.4056/sigs.4898640] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The workshop-hackathon was convened by the Global Biodiversity Information Facility (GBIF) at its secretariat in Copenhagen over 22-24 May 2013 with additional support from several projects (RCN4GSC, EAGER, VertNet, BiSciCol, GGBN, and Micro B3). It assembled a team of experts to address the challenge of adapting the Darwin Core standard for a wide variety of sample data. Topics addressed in the workshop included 1) a review of outstanding issues in the Darwin Core standard, 2) issues relating to publishing of biodiversity data through Darwin Core Archives, 3) use of Darwin Core Archives for publishing sample and monitoring data, 4) the case for modifying the Darwin Core Text Guide specification to support many-to-many relations, and 5) the generalization of the Darwin Core Archive to a “Biodiversity Data Archive”. A wide variety of use cases were assembled and discussed in order to inform further developments.
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Affiliation(s)
- John Wieczorek
- Museum of Vertebrate Zoology University of California Berkeley, CA USA
| | - Olaf Bánki
- Global Biodiversity Information Facility, GBIF Secretariat, Copenhagen, Denmark
| | - Stan Blum
- California Academy of Sciences, San Francisco, USA
| | - John Deck
- The University of California at Berkeley, Berkeley Natural History Museums, Berkeley, California, USA
| | - Markus Döring
- Global Biodiversity Information Facility, GBIF Secretariat, Copenhagen, Denmark
| | - Gabriele Dröge
- Botanic Garden & Botanical Museum Berlin-Dahlem, Freie Universität Berlin, Berlin, Germany
| | - Dag Endresen
- GBIF-Norway, Natural History Museum, University of Oslo, Oslo, Norway
| | | | | | | | - Éamonn Ó Tuama
- Global Biodiversity Information Facility, GBIF Secretariat, Copenhagen, Denmark
| | - Robert J. Robbins
- RCN4GSC Project, University of California at San Diego, La Jolla, CA, USA
| | - Tim Robertson
- Global Biodiversity Information Facility, GBIF Secretariat, Copenhagen, Denmark
| | - Pelin Yilmaz
- Microbial Genomics Group, Max Planck Institute for Marine Microbiology & Jacobs University Bremen, Germany
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Fuchs MA, Zevaco TA, Ember E, Walter O, Held I, Dinjus E, Döring M. Synthesis of cyclic carbonates from epoxides and carbon dioxide catalyzed by an easy-to-handle ionic iron(III) complex. Dalton Trans 2013; 42:5322-9. [PMID: 23403909 DOI: 10.1039/c3dt32961e] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the successful utilization of monometallic, ionic iron(II)- and iron(III)-N2O2-ligand-systems as highly active homogeneous catalysts for the conversion of CO2 with different epoxides to cyclic carbonates. The catalytic tests were performed using propylene oxide (PO) and a range of nine substituted epoxides. Terminal monosubstituted oxides react quantitatively.
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Affiliation(s)
- M A Fuchs
- Institut für Katalyseforschung und -Technologie (IKFT), Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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20
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Adolph M, Zevaco T, Walter O, Dinjus E, Döring M. Easy-to-handle ionic transition metal complexes in the formation of carbonates from epoxides and CO2: A N4-ligand system based on N,N-bis(2-pyridinecarboxamide)-1,2-benzene. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.09.011] [Citation(s) in RCA: 26] [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: 11/25/2022]
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21
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Tuama EÓ, Deck J, Dröge G, Döring M, Field D, Kottmann R, Ma J, Mori H, Morrison N, Sterk P, Sugawara H, Wieczorek J, Wu L, Yilmaz P. Meeting Report: Hackathon-Workshop on Darwin Core and MIxS Standards Alignment (February 2012). Stand Genomic Sci 2012; 7:166-70. [PMID: 23451295 PMCID: PMC3570805 DOI: 10.4056/sigs.3166513] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The Global Biodiversity Information Facility and the Genomic Standards Consortium convened a joint workshop at the University of Oxford, 27-29 February 2012, with a small group of experts from Europe, USA, China and Japan, to continue the alignment of the Darwin Core with the MIxS and related genomics standards. Several reference mappings were produced as well as test expressions of MIxS in RDF. The use and management of controlled vocabulary terms was considered in relation to both GBIF and the GSC, and tools for working with terms were reviewed. Extensions for publishing genomic biodiversity data to the GBIF network via a Darwin Core Archive were prototyped and work begun on preparing translations of the Darwin Core to Japanese and Chinese. Five genomic repositories were identified for engagement to begin the process of testing the publishing of genomic data to the GBIF network commencing with the SILVA rRNA database.
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Affiliation(s)
- Eamonn Ó Tuama
- Global Biodiversity Information Facility, GBIF Secretariat, Copenhagen, Denmark
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22
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Wieczorek J, Bloom D, Guralnick R, Blum S, Döring M, Giovanni R, Robertson T, Vieglais D. Darwin Core: an evolving community-developed biodiversity data standard. PLoS One 2012; 7:e29715. [PMID: 22238640 PMCID: PMC3253084 DOI: 10.1371/journal.pone.0029715] [Citation(s) in RCA: 415] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Accepted: 12/01/2011] [Indexed: 11/28/2022] Open
Abstract
Biodiversity data derive from myriad sources stored in various formats on many distinct hardware and software platforms. An essential step towards understanding global patterns of biodiversity is to provide a standardized view of these heterogeneous data sources to improve interoperability. Fundamental to this advance are definitions of common terms. This paper describes the evolution and development of Darwin Core, a data standard for publishing and integrating biodiversity information. We focus on the categories of terms that define the standard, differences between simple and relational Darwin Core, how the standard has been implemented, and the community processes that are essential for maintenance and growth of the standard. We present case-study extensions of the Darwin Core into new research communities, including metagenomics and genetic resources. We close by showing how Darwin Core records are integrated to create new knowledge products documenting species distributions and changes due to environmental perturbations.
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Affiliation(s)
- John Wieczorek
- University of California, Berkeley, California, United States of America
| | - David Bloom
- University of California, Berkeley, California, United States of America
| | - Robert Guralnick
- University of Colorado, Boulder, Colorado, United States of America
| | - Stan Blum
- California Academy of Sciences, San Francisco, California, United States of America
| | - Markus Döring
- Global Biodiversity Information Facility, Copenhagen, Denmark
| | - Renato Giovanni
- Centro de Referência em Informação Ambiental, Campinas, São Paulo, Brasil
| | - Tim Robertson
- Global Biodiversity Information Facility, Copenhagen, Denmark
| | - David Vieglais
- University of Kansas, Lawrence, Kansas, United States of America
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Huang F, Döring M, Rönchen D, Haberzettl H, Haidenbauer J, Hanhart C, Krewald S, Meißner UG, Nakayama K. Meson production in hadron- and photon-induced reactions. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123701022] [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: 11/15/2022] Open
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Köppl T, Brehme S, Wolff-Fabris F, Altstädt V, Schartel B, Döring M. Structure−property relationships of halogen-free flame-retarded poly(butylene terephthalate) and glass fiber reinforced PBT. J Appl Polym Sci 2011. [DOI: 10.1002/app.34910] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Siebert F, Cutarella D, Döring M, Aubineau-Lanièce I. 688 poster EVALUATION OF THE I25-S06 SEED DESIGN DIMENSIONS USING DESTRUCTIVE AND NON-DESTRUCTIVE METHODS. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)70810-6] [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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Brehme S, Schartel B, Goebbels J, Fischer O, Pospiech D, Bykov Y, Döring M. Phosphorus polyester versus aluminium phosphinate in poly(butylene terephthalate) (PBT): Flame retardancy performance and mechanisms. Polym Degrad Stab 2011. [DOI: 10.1016/j.polymdegradstab.2011.01.035] [Citation(s) in RCA: 182] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Perret B, Schartel B, Stöß K, Ciesielski M, Diederichs J, Döring M, Krämer J, Altstädt V. Novel DOPO-based flame retardants in high-performance carbon fibre epoxy composites for aviation. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2011.02.008] [Citation(s) in RCA: 282] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Medrihan L, Rohlmann A, Fairless R, Andrae J, Döring M, Missler M, Zhang W, Kilimann MW. Neurobeachin, a protein implicated in membrane protein traffic and autism, is required for the formation and functioning of central synapses. J Physiol 2009; 587:5095-106. [PMID: 19723784 DOI: 10.1113/jphysiol.2009.178236] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The development of neuronal networks in the brain requires the differentiation of functional synapses. Neurobeachin (Nbea) was identified as a putative regulator of membrane protein trafficking associated with tubulovesicular endomembranes and postsynaptic plasma membranes. Nbea is essential for evoked transmission at neuromuscular junctions, but its role in the central nervous system has not been characterized. Here, we have studied central synapses of a newly generated gene-trap knockout (KO) mouse line at embryonic day 18, because null-mutant mice are paralysed and die perinatally. Although the overall brain architecture was normal, we identified major abnormalities of synaptic function in mutant animals. In acute slices from the brainstem, both spontaneous excitatory and inhibitory postsynaptic currents were clearly reduced and failure rates of evoked inhibitory responses were markedly increased. In addition, the frequency of miniature excitatory and both the frequency and amplitudes of miniature inhibitory postsynaptic currents were severely diminished in KO mice, indicating a perturbation of both action potential-dependent and -independent transmitter release. Moreover, Nbea appears to be important for the formation and composition of central synapses because the area density of mature asymmetric contacts in the fetal brainstem was reduced to 30% of wild-type levels, and the expression levels of a subset of synaptic marker proteins were smaller than in littermate controls. Our data demonstrate for the first time a function of Nbea at central synapses that may be based on its presumed role in targeting membrane proteins to synaptic contacts, and are consistent with the 'excitatory-inhibitory imbalance' model of autism where Nbea gene rearrangements have been detected in some patients.
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Affiliation(s)
- Lucian Medrihan
- Center for Physiology, Georg-August University and DFG-Research Center of Molecular Physiology of the Brain, D-37073 Göttingen, Germany
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Ajaka J, Assafiri Y, Bartalini O, Bellini V, Bouchigny S, Castoldi M, D'Angelo A, Didelez JP, Di Salvo R, Döring M, Fantini A, Fichen L, Gervino G, Ghio F, Girolami B, Giusa A, Guidal M, Hourany E, Kunne R, Lapik A, Sandri PL, Moricciani D, Mushkarenkov A, Nedorezov V, Oset E, Randieri C, Rudnev N, Russo G, Schaerf C, Sperduto M, Sutera M, Turinge A. Simultaneous photoproduction of eta and pi0 mesons on the proton. Phys Rev Lett 2008; 100:052003. [PMID: 18352363 DOI: 10.1103/physrevlett.100.052003] [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: 09/05/2007] [Indexed: 05/26/2023]
Abstract
The analysis of the gammap-->etapi(0)p reaction has been performed using data from the GRAAL experiment. The total and differential cross sections and the beam asymmetry have been obtained from threshold up to 1.5 GeV of beam energy. The two resonances S11(1535) and Delta(1700) are expected to be excited in the intermediate states of this reaction. The results are used to test predictions based on the assumption that both resonances are dynamically generated from the meson-baryon interaction provided by chiral Lagrangians. The term involving the Delta(1700) excitation, followed by the decay into etaDelta(1232), is found to be dominant.
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Affiliation(s)
- J Ajaka
- IN2P3, Institut de Physique Nucléaire, 91406 Orsay, France
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Seibold S, Schäfer A, Lohstroh W, Walter O, Döring M. Phosphorus-containing terephthaldialdehyde adducts—Structure determination and their application as flame retardants in epoxy resins. J Appl Polym Sci 2008. [DOI: 10.1002/app.27550] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ciesielski M, Schäfer A, Döring M. Novel efficient DOPO-based flame-retardants for PWB relevant epoxy resins with high glass transition temperatures. POLYM ADVAN TECHNOL 2008. [DOI: 10.1002/pat.1090] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Perez R, Sandler J, Altstädt V, Hoffmann T, Pospiech D, Ciesielski M, Döring M, Braun U, Balabanovich A, Schartel B. Novel phosphorus-modified polysulfone as a combined flame retardant and toughness modifier for epoxy resins. POLYMER 2007. [DOI: 10.1016/j.polymer.2006.12.011] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [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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35
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Schartel B, Balabanovich AI, Braun U, Knoll U, Artner J, Ciesielski M, Döring M, Perez R, Sandler JKW, Altstädt V, Hoffmann T, Pospiech D. Pyrolysis of epoxy resins and fire behavior of epoxy resin composites flame-retarded with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide additives. J Appl Polym Sci 2007. [DOI: 10.1002/app.25660] [Citation(s) in RCA: 187] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Perez RM, Sandler JKW, Altstädt V, Hoffmann T, Pospiech D, Artner J, Ciesielski M, Döring M, Balabanovich AI, Knoll U, Braun U, Schartel B. Novel phosphorus-containing hardeners with tailored chemical structures for epoxy resins: Synthesis and cured resin properties. J Appl Polym Sci 2007. [DOI: 10.1002/app.26537] [Citation(s) in RCA: 38] [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: 11/06/2022]
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Grolig F, Döring M, Galland P. Gravisusception by buoyancy: a mechanism ubiquitous among fungi? Protoplasma 2006; 229:117-23. [PMID: 17180492 DOI: 10.1007/s00709-006-0218-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2005] [Accepted: 11/25/2005] [Indexed: 05/13/2023]
Abstract
Gravitropism is ubiquitous among the fungal taxa; however, the mechanism(s) of gravisusception have overall remained obscure so far. In the vegetative sporangiophore of the zygomycete Phycomyces blakesleeanus some 200 large lipid globules form a conspicuous spherical complex which is positioned in a dense mesh of filamentous actin about 100 microm below the growing tip of the apex. Experimental suppression of that complex by transient growth at low temperature greatly diminishes the gravitropic response of the sporangiophore. With respect to size and abundance of the globules, the complex of lipid globules meets basic physical criteria for a possible function of gravisusception. Accumulations of similar lipid globules of critical size are documented in the apex of gravitropically growing hyphae of the endomycorrhizal fungus Gigaspora margarita (Glomeromycota) and have been described in the hyphal apices of members of various fungal phyla. We suppose that--in contrast to plants which use starch as a carbon storage and amyloplasts as statoliths--the fungi utilise the buoyancy of carbon-storing oil droplets for gravisusception.
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Affiliation(s)
- F Grolig
- Pflanzenphysiologie und Photobiologie, Fachbereich Biologie, Philipps-Universität, Marburg, Federal Republic of Germany.
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38
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Döring M, Loos A, Schrader N, Pfander B, Bauerfeind R. Nerve growth factor-induced phosphorylation of amphiphysin-1 by casein kinase 2 regulates clathrin-amphiphysin interactions. J Neurochem 2006; 98:2013-22. [PMID: 16945112 DOI: 10.1111/j.1471-4159.2006.04037.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [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
Amphiphysins interact directly with clathrin and have a function in clathrin-mediated synaptic vesicle recycling and clathrin-mediated endocytosis. The neuronal isoform amphiphysin-1 is a serine/threonine phosphoprotein that is dephosphorylated upon stimulation of synaptic vesicle endocytosis. Rephosphorylation was stimulated by nerve growth factor. We analysed the regulation of amphiphysin-clathrin interactions by phosphorylation. The N-terminal domain of clathrin bound to unphosphorylated amphiphysin-1, but not to the phosphorylated protein. A search for possible phosphorylation sites revealed two casein kinase 2 consensus motifs in close proximity to the clathrin binding sites in amphiphysin-1 and -2. We mutagenized these residues (T350 and T387) to glutamate, mimicking a constitutive phosphorylation. The double mutant showed a strong reduction in clathrin binding. The assumption that casein kinase 2 phosphorylates amphiphysin-1 at T350 and T387 was corroborated by experiments showing that: (i) casein kinase 2 phosphorylated these residues directly in vitro, (ii) when expressed in HeLa cells, the glutamate mutant showed reduced phosphorylation, and (iii) casein kinase 2 inhibitors blocked nerve growth factor-induced phosphorylation of endogenous amphiphysin-1 in PC12 cells. These observations are consistent with the hypothesis that, upon activation by nerve growth factor, casein kinase 2 phosphorylates amphiphysin-1 and thereby regulates the endocytosis of clathrin-coated vesicles via the interaction between clathrin and amphiphysin.
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Affiliation(s)
- Markus Döring
- Department of Cell Biology, Hannover Medical School, Hannover, Germany
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Arnold U, Döring M. Metalldotierte Hochleistungsduromere – Neue Katalysatoren für die Epoxidierung von Alkenen. CHEM-ING-TECH 2005. [DOI: 10.1002/cite.200590195] [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: 11/10/2022]
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Bluhm M, Albers J, Dinjus E, Döring M. Reaktoreinsatz zum parallelen Testen homogener Katalysatoren. CHEM-ING-TECH 2004. [DOI: 10.1002/cite.200403439] [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: 11/08/2022]
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Abstract
A new multicomponent reaction (multiple-anion-capture reaction) of 1,3-dianions with nitriles and oxalic acid-bis(imidoyl)chlorides is reported. This process allows for an efficient and regioselective synthesis of a variety of radialene-shaped pyrroles which constitute structurally new and interesting heterocyclic systems. The cyclization products can be considered as aza-analogues of the pharmacologically relevant substance class of 3-acetyltetramic acids. A rationalization of the experimental results is given based on quantum chemical computations.
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Affiliation(s)
- P Langer
- Institut für Organische Chemie der Georg-August-Universität Göttingen, Germany.
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Abstract
The first elimination reactions of silyl enol ethers to lithiated allenes are reported. These reactions allow a direct transformation of readily available silyl enol ethers into functionalized allenes. The action of three to four equivalents of lithium diisopropylamide (LDA) on silyl enol ethers results in the formation of lithiated allenes by initial allylic lithiation, subsequent elimination of a lithium silanolate, and finally, lithiation of the allene thus formed. Starting with amide-derived silyl imino ethers, lithiated ketenimines are obtained. A variety of reactions of the lithiated allenes with electrophiles (chlorosilanes, trimethylchlorostannane, dimethyl sulfate and ethanol) were carried out. Elimination of silanolate is observed only for substrates that contain the hindered SiMe2tBu or Si(iPr)3 moiety, but not for the SiMe3 group. The reaction of 1,1-dilithio-3,3-diphenylallene with ketones provides a convenient access to novel 1,1-di(hydroxymethyl)allenes which undergo a domino Nazarov-Friedel-Crafts reaction upon treatment with p-toluenesulfonic acid.
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Affiliation(s)
- P Langer
- Institut für Organische Chemie der Georg-August-Universität Göttingen, Germany.
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Abstract
BACKGROUND AND OBJECTIVE Apart from the ablation properties at the stapes footplate, the degree of thermic loading in the inner ear is important in determining the suitability of pulsed lasers for stapedotomy. The aim of the study is to compare the thermic effects in the vestibule with different pulsed laser systems. STUDY DESIGN/MATERIALS AND METHODS Temperature increases and heat exchange processes in the fluid (physiological saline) were examined in a calorically and physiologically approximated cochlea model for applying the laser parameters effective in creating footplate perforations. RESULTS With all systems, increases in the energy density, number of pulses, and thus resultant total energy lead to higher temperatures. In the effective energy density range, the highest temperature increases achieved with the requisite number of pulses at a distance of 2 mm behind the perforation are 26 degrees C with the Ho:YAG laser. The lowest temperature maxima are 5.5 degrees C with the Er:YAG and <5 degrees C with the Er:YSGG laser. The excimer laser, investigated at only one energy density, showed maximal temperatures of 10 degrees C. CONCLUSION The Er:YSGG and Er:YAG laser can be applied in laser stapedotomy in a relatively broad energy density range without a risk of inner ear damage by thermic loading. On the other hand, the Ho:YAG laser is not recommended for stapedotomy because of the higher energy density and pulse rate required for sufficient perforation and the resultant higher temperature increases in the perilymph. Though likewise achieving perforations with only slight temperature increases in the fluid of the cochlea model, the excimer laser does not seem appropriate for stapedotomy because of the long period of heat exposure (ca. 60 s) due to the lower ablation rate at the stapes necessitating a longer application time.
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Affiliation(s)
- S Jovanovic
- ENT Department, Benjamin Franklin Medical Center, Free University of Berlin, Germany.
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Bräuer M, Kunert M, Dinjus E, Klußmann M, Döring M, Görls H, Anders E. Evaluation of the accuracy of PM3, AM1 and MNDO/d as applied to zinc compounds. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0166-1280(99)00401-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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46
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Döring M, Willmann G, Boenick U. HOCHVERNETZTE POLYETHYLENE IN DER HÜFTENDOPROTHETIK. BIOMED ENG-BIOMED TE 2000. [DOI: 10.1515/bmte.2000.45.s1.501] [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: 11/15/2022]
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Döring M. [Acute and rehabilitative care of children with prenatal infections]. Kinderkrankenschwester 1996; 15:107-110. [PMID: 8715617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Jovanovic S, Schönfeld U, Fischer R, Döring M, Prapavat V, Müller G, Scherer H. [Thermal stress on the inner ear in laser stapedotomy]. HNO 1996; 44:6-13. [PMID: 8819722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Apart from ablation properties at the stapes footplate, the degree of thermal stress of the inner ear is important when considering the suitability of pulsed lasers for stapedotomy. The aim of the present study was to compare the heating of cochlear structures with presently available pulsed laser systems during stapedotomy under reproducible conditions. Temperature increases and heat-exchange processes were examined in a physiologic model of the cochlea using various laser parameters effective for footplate perforations. With all systems, increases in energy density, number of pulses and resultant total energy led to higher temperatures. In the effective energy density range, the highest temperature increases achieved with the requisite number of pulses at a distance of 2 mm behind the footplate perforation were 30 degrees and 26 degrees C with the pulsed CO2 and Ho:YAG lasers, respectively. The lowest temperature recorded was 5.5 degrees C with the Er:YAG and <5 degrees C with the Er:YSGG laser. The excimer laser investigated at only one energy density showed maximum temperatures of 10 degrees C. With regard to possible inner ear damage from thermal stress during laser stapedotomy, the Er:YSGG laser can be used safely over a relatively broad energy density range. The Er:YAG laser investigated also appears suitable for stapedotomy when considering thermal effects. In contrast, application of the pulsed CO2 laser at parameters effective for stapedotomy leads to high temperatures and wide scattering to compromise its use. The Ho:YAG laser also appears to be unsuitable because of the higher energy density and pulse rate required for sufficient perforation and the resultant higher temperature increases in the perilymph. Although footplate perforations can be achieved with only slight temperature increases in the fluid of the cochlea model, the excimer laser does not seem to be appropriate for stapedotomy because of the long period of heat exposure required and the lower ablation rates at the stapes.
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50
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Jovanovic S, Schönfeld U, Fischer R, Döring M, Prapavat V, Müller G, Scherer H. [Thermal stress of the inner ear during laser stapedotomy. I: Continuous-wave laser]. HNO 1995; 43:702-9. [PMID: 8582829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
As a consequence of perforating the footplate during laser stapedotomy, direct radiation to the inner ear will warm perilymph and adjacent structures. To determine the possible thermal dangers to cochlear structures from different laser parameters, heat transport mechanisms, temperature increases and temperature fields were investigated in a model system approximating caloric and physiologic changes in the inner ear. The temperature-time course of local cochlear warming showed a rapid convection-dependent increase that reached a peak at about the end of the laser impulse. An increase in power density caused an elevation of the temperature in all laser systems used. Maximum temperatures varied widely for CO2 lasers at the same wave-length, but a different beam-time behavior was found at a distance of 2 mm behind the perforation by using low-power densities. Heat values were lowest at a pulse duration of 50 ms in the superpulse (< 5 degrees C) and continuous wave (cw) modes (< 9 degrees C), while the highest value was found in the pulser mode (to 21 degrees C). After argon laser irradiation at high-power densities, temperatures were nearly independent of location (5.5-13 degrees C). When considering risks of possible inner ear damage from thermal stress during laser stapedotomy, application of the CO2 superpulse and cw laser appears to be safe over a large power-density range. Low energies using a small-beam diameter and short pulse durations (50-100 ms) are recommended. In contrast, use of the CO2 laser in a pulser mode may result in inner-ear damage because of the high temperatures produced. Structures located at a greater distance can be endangered by direct irradiation with the argon laser.
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Affiliation(s)
- S Jovanovic
- HNO-Klinik mit Polikliniken, Freien Universität Berlin
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