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Werner JM, Krüger T, Drossel WG. Feasibility Study for Monitoring an Ultrasonic System Using Structurally Integrated Piezoceramics. Sensors (Basel) 2024; 24:1036. [PMID: 38339753 PMCID: PMC10857525 DOI: 10.3390/s24031036] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 01/26/2024] [Accepted: 02/02/2024] [Indexed: 02/12/2024]
Abstract
This paper presents a new approach to monitoring ultrasonic systems using structurally integrated piezoceramics. These are integrated into the sonotrode at different points and with different orientations. The procedure for integrating the piezoceramics into the sonotrode and their performance is experimentally investigated. We examine whether the measured signal can be used to determine the optimal operating frequency of the ultrasonic system, if integrating several piezoceramics enables discernment of the current vibration shape, and if the piezoceramics can withstand the high strains caused by the vibrations in a frequency range of approximately 20-25 kHz. The signals from the piezoceramic sensors are compared to the real-time displacement at different points of the sonotrode using a 3D laser scanning vibrometer. To evaluate the performance of the sensors, different kinds of excitation of the ultrasonic system are chosen.
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Affiliation(s)
- Jonas M. Werner
- Professorship for Adaptronics and Lightweight Design in Production, Chemnitz University of Technology, Reichenhainer Straße 70, 09126 Chemnitz, Germany; (T.K.)
| | - Tim Krüger
- Professorship for Adaptronics and Lightweight Design in Production, Chemnitz University of Technology, Reichenhainer Straße 70, 09126 Chemnitz, Germany; (T.K.)
| | - Welf-Guntram Drossel
- Professorship for Adaptronics and Lightweight Design in Production, Chemnitz University of Technology, Reichenhainer Straße 70, 09126 Chemnitz, Germany; (T.K.)
- Fraunhofer Institute for Machine Tools and Forming Technology IWU, 09126 Chemnitz, Germany
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2
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Grieshaber P, Hamiko M, Albert M, Ginsberg J, Krüger T, Brenck F, Böning A. Surgical Myocardial Revascularization in Patients with Acute Myocardial Infarction and Cardiogenic Shock: Data from the GERMIN-SURG Registry. Thorac Cardiovasc Surg 2022. [DOI: 10.1055/s-0042-1742882] [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: 10/19/2022]
Affiliation(s)
- P. Grieshaber
- Department of Cardiac Surgery, University Hospital Heidelberg, Heidelberg, Deutschland
| | - M. Hamiko
- Sigmund-Freud-Str 25, Bonn, Deutschland
| | - M. Albert
- Herz- und Gefäßchirurgie, Robert-Bosch-Hospital, Stuttgart, Deutschland
| | - J. Ginsberg
- Department of Anesthesiology, Luzerner Kantonsspital, Luzern, Switzerland
| | - T. Krüger
- Hoppe-Seyler-Straße 3, Tübingen, Deutschland
| | - F. Brenck
- Department of Anesthesiology, Universitätsklinikum Gießen, Gießen, Deutschland
| | - A. Böning
- Rudolf-Buchheim-Str. 7, Gießen, Deutschland
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3
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Pepona M, Shek ACM, Semprebon C, Krüger T, Kusumaatmaja H. Modeling ternary fluids in contact with elastic membranes. Phys Rev E 2021; 103:022112. [PMID: 33735964 DOI: 10.1103/physreve.103.022112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 01/15/2021] [Indexed: 11/07/2022]
Abstract
We present a thermodynamically consistent model of a ternary fluid interacting with elastic membranes. Following a free-energy modeling approach for the fluid phases, we derive the governing equations for the dynamics of the ternary fluid flow and membranes. We also provide the numerical framework for simulating such fluid-structure interaction problems. It is based on the lattice Boltzmann method for the ternary fluid (Eulerian description) and a finite difference representation of the membrane (Lagrangian description). The ternary fluid and membrane solvers are coupled through the immersed boundary method. For validation purposes, we consider the relaxation dynamics of a two-dimensional elastic capsule placed at a fluid-fluid interface. The capsule shapes, resulting from the balance of surface tension and elastic forces, are compared with equilibrium numerical solutions obtained by surface evolver. Furthermore, the Galilean invariance of the proposed model is proven. The proposed approach is versatile, allowing for the simulation of a wide range of geometries. To demonstrate this, we address the problem of a capillary bridge formed between two deformable capsules.
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Affiliation(s)
- M Pepona
- Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - A C M Shek
- Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - C Semprebon
- Smart Materials and Surfaces Laboratory, Department of Mathematics, Physics and Electrical Engineering, Ellison Place, Northumbria University, Newcastle upon Tyne, NE1 8ST, United Kingdom
| | - T Krüger
- School of Engineering, Institute for Multiscale Thermofluids, The University of Edinburgh, Edinburgh EH9 3FB, Scotland, United Kingdom
| | - H Kusumaatmaja
- Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom
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Berger R, Hamdoun H, Kowol B, Boburg RS, Nemeth A, Krüger T, Schlensak C, Popov AF. Quality of Life after Urgent LVAD Implantation under ECMO Therapy Due to Cardiogenic Shock: A Long-Term Follow-up. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725611] [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: 10/21/2022]
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Krüger T, Forkavets O, Brefka S, Conzelmann L, Thomas C, Mehlhorn U, Liebold A, Schlensak C, Eschweiler G. Postoperative Delirium and Cognitive Dysfunction after On- and Off-Pump CABG Surgery: A Prospective Trial in Aged Patients. Thorac Cardiovasc Surg 2020. [DOI: 10.1055/s-0040-1705402] [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: 10/24/2022]
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Gryszkiewicz R, Lausberg HF, Kuetting M, Baumgaertner M, Centola M, Wendel HP, Nowak-Machen M, Krüger T, Schlensak C. Kathetergestützter Trikuspidalklappenersatz mit innovativer klappentragender Stent-Prothese. Z Herz- Thorax- Gefäßchir 2019. [DOI: 10.1007/s00398-018-0279-x] [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: 10/28/2022]
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Salewski C, Ly J, Spintzyk S, Nemeth A, Sandoval Boburg J, Hamdoun H, Krüger T, Popov AF, Schlensak C. Patient-Specific Vascular Anatomy for ECMO Training Model Realized with 3D Printing. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678904] [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)
- C. Salewski
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - J. Ly
- Section Medical Materials Science & Technology, University Hospital Tuebingen, Tuebingen, Germany
| | - S. Spintzyk
- Section Medical Materials Science & Technology, University Hospital Tuebingen, Tuebingen, Germany
| | - A. Nemeth
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - J.R. Sandoval Boburg
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - H. Hamdoun
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - T. Krüger
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - A.-F. Popov
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tuebingen, Germany
| | - C. Schlensak
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tuebingen, Germany
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Lang L, Cattaneo G, Popov F, Krüger T, Salewski C, Nemeth A, Wendel H, Krajewski S, Schlensak C. Nitrated Oleic Acid Coating of Nitinol Grafts to Diminish Stent-Angioplasty-Associated Thrombotic Complications. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678977] [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)
- L. Lang
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | | | - F. Popov
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - T. Krüger
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - C. Salewski
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - A. Nemeth
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - H.P. Wendel
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - S. Krajewski
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - C. Schlensak
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
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Krüger T, Nemeth A, Wöhner I, Hamdoun H, Popov AF, Schlensak C. Photodynamic Antimicrobial Chemotherapy in LVAD-Driveline Infections: Initial Single-Center Experience. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678912] [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)
- T. Krüger
- Department of Thoracic and Cardiovascular Surgery, University Medical Center Tübingen, Tübingen, Germany
| | - A. Nemeth
- Department of Thoracic and Cardiovascular Surgery, University Medical Center Tübingen, Tübingen, Germany
| | - I. Wöhner
- Department of Thoracic and Cardiovascular Surgery, University Medical Center Tübingen, Tübingen, Germany
| | - H. Hamdoun
- Department of Thoracic and Cardiovascular Surgery, University Medical Center Tübingen, Tübingen, Germany
| | - A.-F. Popov
- Department of Thoracic and Cardiovascular Surgery, University Medical Center Tübingen, Tübingen, Germany
| | - C. Schlensak
- Department of Thoracic and Cardiovascular Surgery, University Medical Center Tübingen, Tübingen, Germany
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Avci-Adali M, Steinle H, Golombek S, Behring A, Popov AF, Krüger T, Salewski C, Nemeth A, Wendel H, Schlensak C. Modification of EPCs with Synthetic mRNA for Improved Angiogenesis. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678871] [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. Avci-Adali
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - H. Steinle
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - S. Golombek
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - A. Behring
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - A.-F. Popov
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - T. Krüger
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - C. Salewski
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - A. Nemeth
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - H.P. Wendel
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - C. Schlensak
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
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Nemeth A, Popov F, Krüger T, Baumgärtner M, Hamdoun H, Salewski C, Lausberg F, Schlensak C. The Fate of the Aortic Valve after Implantation of Abiomed Impella-Device in Heart-Failure Patients Bridged to Permanent LVAD. Is There a Risk for Aortic Regurgitation in the Long Term? Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678885] [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)
- A. Nemeth
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tübingen, Germany
| | - F. Popov
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tübingen, Germany
| | - T. Krüger
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tübingen, Germany
| | - M. Baumgärtner
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tübingen, Germany
| | - H. Hamdoun
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tübingen, Germany
| | - C. Salewski
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tübingen, Germany
| | - F. Lausberg
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tübingen, Germany
| | - C. Schlensak
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Tübingen, Germany
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Avci-Adali M, Steinle H, Weber M, Behring A, Popov AF, Krüger T, Salewski C, Nemeth A, Wendel H, Schlensak C. Foot-Print Free Generation of Cardiomyocytes from Somatic Cells. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678869] [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. Avci-Adali
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - H. Steinle
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - M. Weber
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - A. Behring
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - A.-F. Popov
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - T. Krüger
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - C. Salewski
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - A. Nemeth
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - H.P. Wendel
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - C. Schlensak
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
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Conrad T, Kniemeyer O, Henkel SG, Krüger T, Mattern DJ, Valiante V, Guthke R, Jacobsen ID, Brakhage AA, Vlaic S, Linde J. Module-detection approaches for the integration of multilevel omics data highlight the comprehensive response of Aspergillus fumigatus to caspofungin. BMC Syst Biol 2018; 12:88. [PMID: 30342519 PMCID: PMC6195963 DOI: 10.1186/s12918-018-0620-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 10/08/2018] [Indexed: 12/20/2022]
Abstract
Background Omics data provide deep insights into overall biological processes of organisms. However, integration of data from different molecular levels such as transcriptomics and proteomics, still remains challenging. Analyzing lists of differentially abundant molecules from diverse molecular levels often results in a small overlap mainly due to different regulatory mechanisms, temporal scales, and/or inherent properties of measurement methods. Module-detecting algorithms identifying sets of closely related proteins from protein-protein interaction networks (PPINs) are promising approaches for a better data integration. Results Here, we made use of transcriptome, proteome and secretome data from the human pathogenic fungus Aspergillus fumigatus challenged with the antifungal drug caspofungin. Caspofungin targets the fungal cell wall which leads to a compensatory stress response. We analyzed the omics data using two different approaches: First, we applied a simple, classical approach by comparing lists of differentially expressed genes (DEGs), differentially synthesized proteins (DSyPs) and differentially secreted proteins (DSePs); second, we used a recently published module-detecting approach, ModuleDiscoverer, to identify regulatory modules from PPINs in conjunction with the experimental data. Our results demonstrate that regulatory modules show a notably higher overlap between the different molecular levels and time points than the classical approach. The additional structural information provided by regulatory modules allows for topological analyses. As a result, we detected a significant association of omics data with distinct biological processes such as regulation of kinase activity, transport mechanisms or amino acid metabolism. We also found a previously unreported increased production of the secondary metabolite fumagillin by A. fumigatus upon exposure to caspofungin. Furthermore, a topology-based analysis of potential key factors contributing to drug-caused side effects identified the highly conserved protein polyubiquitin as a central regulator. Interestingly, polyubiquitin UbiD neither belonged to the groups of DEGs, DSyPs nor DSePs but most likely strongly influenced their levels. Conclusion Module-detecting approaches support the effective integration of multilevel omics data and provide a deep insight into complex biological relationships connecting these levels. They facilitate the identification of potential key players in the organism’s stress response which cannot be detected by commonly used approaches comparing lists of differentially abundant molecules. Electronic supplementary material The online version of this article (10.1186/s12918-018-0620-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- T Conrad
- Systems Biology/Bioinformatics, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany.
| | - O Kniemeyer
- Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany
| | | | - T Krüger
- Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany
| | - D J Mattern
- Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany.,Present address: PerkinElmer Inc., Rodgau, Germany
| | - V Valiante
- Biobricks of Microbial Natural Product Syntheses, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany
| | - R Guthke
- Systems Biology/Bioinformatics, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany
| | - I D Jacobsen
- Microbial Immunology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany.,Institute for Microbiology, Friedrich Schiller University, Jena, Germany
| | - A A Brakhage
- Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany.,Institute for Microbiology, Friedrich Schiller University, Jena, Germany
| | - S Vlaic
- Systems Biology/Bioinformatics, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany
| | - J Linde
- Research Group PiDOMICs, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Jena, Germany.,Institute for Bacterial Infections and Zoonoses, Federal Research Institute for Animal Health - Friedrich Loeffler Institute, Jena, Germany
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Gylling SMK, Frandsen SS, Østergaard S, Thomsen MH, Christophersen MT, Krüger T, Jacobsen S. The effect of a compression bandage on the distribution of radiodense contrast medium after palmar digital nerve blocks. Equine Vet J 2018; 51:261-265. [PMID: 30071153 DOI: 10.1111/evj.13000] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 07/29/2018] [Indexed: 11/26/2022]
Abstract
BACKGROUND Studies have shown proximal diffusion of injected drugs in perineural blocks; such diffusion may affect specificity of the nerve block. OBJECTIVES To investigate the effect of a compression bandage applied to the pastern region on proximal diffusion of contrast medium injected over the palmar digital nerves. STUDY DESIGN Experimental study, randomised cross-over design. METHODS Radiodense contrast medium was injected over the lateral and medial palmar digital nerves of the left front limb of nine mature horses. Each horse was injected on two separate occasions, once with a 5 cm wide compression bandage applied proximal to the injection site and once without. The order of the two treatments was randomised with a wash-out period between treatments of at least 7 days. Radiographs were obtained at 5, 10, 20 and 30 min and distribution of the contrast column assessed. RESULTS Proximal distribution of the contrast medium was significantly reduced (P<0.01) with compression bandage. Furthermore, the compression bandage inhibited lymphatic drainage of the injected contrast medium. MAIN LIMITATIONS Clinical effect of the differences in diffusion length was not assessed. CONCLUSIONS The compression bandage reduced proximal diffusion and lymphatic drainage of contrast material causing it to stay localised around the injection site. Use of compression bandages could thus result in increased specificity of the nerve block and potentially prolong its effect.
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Affiliation(s)
- S M K Gylling
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Taastrup, Denmark
| | - S S Frandsen
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Taastrup, Denmark
| | - S Østergaard
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Taastrup, Denmark
| | - M H Thomsen
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Taastrup, Denmark
| | - M T Christophersen
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Taastrup, Denmark
| | - T Krüger
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Taastrup, Denmark
| | - S Jacobsen
- Department of Veterinary Clinical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Taastrup, Denmark
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Kunath J, Granert O, Pohl A, Gerwinn H, Stirn A, Beier K, Walter H, Walter M, Schiffer B, Krüger T, Ponseti J. 204 The “functional magnetic resonance imaging” (fMRI) as a meaningful tool for the differentiation of sexual preferences. J Sex Med 2018. [DOI: 10.1016/j.jsxm.2018.04.170] [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: 10/28/2022]
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Huber L, Suzuki R, Krüger T, Frey E, Bausch AR. Emergence of coexisting ordered states in active matter systems. Science 2018; 361:255-258. [DOI: 10.1126/science.aao5434] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 01/22/2018] [Accepted: 05/16/2018] [Indexed: 01/16/2023]
Abstract
Active systems can produce a far greater variety of ordered patterns than conventional equilibrium systems. In particular, transitions between disorder and either polar- or nematically ordered phases have been predicted and observed in two-dimensional active systems. However, coexistence between phases of different types of order has not been reported. We demonstrate the emergence of dynamic coexistence of ordered states with fluctuating nematic and polar symmetry in an actomyosin motility assay. Combining experiments with agent-based simulations, we identify sufficiently weak interactions that lack a clear alignment symmetry as a prerequisite for coexistence. Thus, the symmetry of macroscopic order becomes an emergent and dynamic property of the active system. These results provide a pathway by which living systems can express different types of order by using identical building blocks.
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Affiliation(s)
- L. Huber
- Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Department of Physics, Ludwig-Maximilians-Universität München, D-80333 Munich, Theresienstrasse 37, Germany
| | - R. Suzuki
- Lehrstuhl für Biophysik (E27), Technische Universität München, James-Franck-Strasse 1, D-85748 Garching, Germany
- Graduate School of Medicine, Kyoto University, 606-8501 Kyoto, Japan
- Institute for Integrated Cell-Material Sciences, Kyoto University, 606-8501 Kyoto, Japan
| | - T. Krüger
- Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Department of Physics, Ludwig-Maximilians-Universität München, D-80333 Munich, Theresienstrasse 37, Germany
| | - E. Frey
- Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Department of Physics, Ludwig-Maximilians-Universität München, D-80333 Munich, Theresienstrasse 37, Germany
| | - A. R. Bausch
- Lehrstuhl für Biophysik (E27), Technische Universität München, James-Franck-Strasse 1, D-85748 Garching, Germany
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Lescan M, Veseli K, Oikonomou A, Walker T, Lausberg H, Blumenstock G, Bamberg F, Schlensak C, Krüger T. Aortic Elongation and Stanford B Dissection: The Tübingen Aortic Pathoanatomy (TAIPAN) Project. Eur J Vasc Endovasc Surg 2017; 54:164-169. [PMID: 28663040 DOI: 10.1016/j.ejvs.2017.05.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 05/28/2017] [Indexed: 01/10/2023]
Abstract
OBJECTIVE/BACKGROUND Aortic elongation has not yet been considered as a potential risk factor for Stanford type B dissection (TBD). The role of both aortic elongation and dilatation in patients with TBD was evaluated. METHODS The aortic morphology of a healthy control group (n = 236) and patients with TBD (n = 96) was retrospectively examined using three dimensional computed tomography imaging. Curved multiplanar reformats were used to examine aortic diameters at defined landmarks and aortic segment lengths. RESULTS Diameters at all landmarks were significantly larger in the TBD group. The greatest diameter difference (56%) was measured in dissected descending aortas (p < .001). The segment with the most considerable difference between the study groups with regard to elongation was the non-dissected aortic arch of patients with TBD (36%; p < .001). Elongation in the aortic arch was accompanied by a diameter increase of 21% (p < .001). In receiver-operating curve analysis, the area under the curve was .85 for the diameter and .86 for the length of the aortic arch. CONCLUSIONS In addition to dilatation, aortic arch elongation is associated with the development of TBD. The diameter and length of the non-dissected aortic arch may be predictive for TBD and may possibly be used for risk assessment in the future. This study provides the basis for further prospective evaluation of these parameters.
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Affiliation(s)
- M Lescan
- Department of Thoracic and Cardiovascular Surgery, University Medical Centre Tübingen, Tübingen, Germany.
| | - K Veseli
- Department of Thoracic and Cardiovascular Surgery, University Medical Centre Tübingen, Tübingen, Germany
| | - A Oikonomou
- Department of Thoracic and Cardiovascular Surgery, University Medical Centre Tübingen, Tübingen, Germany
| | - T Walker
- Department of Thoracic and Cardiovascular Surgery, University Medical Centre Tübingen, Tübingen, Germany
| | - H Lausberg
- Department of Thoracic and Cardiovascular Surgery, University Medical Centre Tübingen, Tübingen, Germany
| | - G Blumenstock
- Institute for Clinical Epidemiology and Applied Biometry, Eberhard Karls University of Tübingen, Tübingen, Germany
| | - F Bamberg
- Department of Diagnostic and Interventional Radiology, University Medical Centre Tübingen, Tübingen, Germany
| | - C Schlensak
- Department of Thoracic and Cardiovascular Surgery, University Medical Centre Tübingen, Tübingen, Germany
| | - T Krüger
- Department of Thoracic and Cardiovascular Surgery, University Medical Centre Tübingen, Tübingen, Germany
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Schibilsky D, Klumm P, Nemeth A, Krüger T, Häberle H, Henn P, Wendel H, Walker T, Schlensak C. Out-of-Center ECLS Implantation: Extended Experience of an Interdisciplinary Team Approach. Thorac Cardiovasc Surg 2017. [DOI: 10.1055/s-0037-1598729] [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: 10/20/2022]
Affiliation(s)
- D. Schibilsky
- Thoracic and Cardiovascular Surgery, University Medical Center Tuebingen, Tuebingen, Germany
| | - P. Klumm
- Thoracic and Cardiovascular Surgery, University Medical Center Tuebingen, Tuebingen, Germany
| | - A. Nemeth
- Thoracic and Cardiovascular Surgery, University Medical Center Tuebingen, Tuebingen, Germany
| | - T. Krüger
- Thoracic and Cardiovascular Surgery, University Medical Center Tuebingen, Tuebingen, Germany
| | - H. Häberle
- Anesthesiology and Intensive Care Medicine, University Medical Center Tuebingen, Tuebingen, Germany
| | - P. Henn
- Anesthesiology and Intensive Care Medicine, University Medical Center Tuebingen, Tuebingen, Germany
| | - H.P. Wendel
- Thoracic and Cardiovascular Surgery, University Medical Center Tuebingen, Tuebingen, Germany
| | - T. Walker
- Thoracic and Cardiovascular Surgery, University Medical Center Tuebingen, Tuebingen, Germany
| | - C. Schlensak
- Thoracic and Cardiovascular Surgery, University Medical Center Tuebingen, Tuebingen, Germany
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Schibilsky D, Benk C, Berchtold-Herz M, Krüger T, Nemeth A, Walker T, Häberle H, Rosenberger P, Wendel H, Trummer G, Siepe M, Beyersdorf F, Schlensak C. Left-Ventricular-Assist-Device Weaning Protocol Including Exercise and Invasive Hemodynamics - Multi-Institutional Experience. Thorac Cardiovasc Surg 2017. [DOI: 10.1055/s-0037-1598827] [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: 10/20/2022]
Affiliation(s)
- D. Schibilsky
- University Medical Center Tuebingen, Thoracic and Cardiovascular Surgery, Tuebingen, Germany
| | - C. Benk
- University Medical Center Freiburg, Cardiovascular Surgery, Freiburg, Germany
| | - M. Berchtold-Herz
- University Medical Center Freiburg, Cardiovascular Surgery, Freiburg, Germany
| | - T. Krüger
- University Medical Center Tuebingen, Thoracic and Cardiovascular Surgery, Tuebingen, Germany
| | - A. Nemeth
- University Medical Center Tuebingen, Thoracic and Cardiovascular Surgery, Tuebingen, Germany
| | - T. Walker
- University Medical Center Tuebingen, Thoracic and Cardiovascular Surgery, Tuebingen, Germany
| | - H. Häberle
- University Medical Center Tuebingen, Anesthesiology and Intensive Care Medicine, Tuebingen, Germany
| | - P. Rosenberger
- University Medical Center Tuebingen, Anesthesiology and Intensive Care Medicine, Tuebingen, Germany
| | - H.P. Wendel
- University Medical Center Tuebingen, Thoracic and Cardiovascular Surgery, Tuebingen, Germany
| | - G. Trummer
- University Medical Center Freiburg, Cardiovascular Surgery, Freiburg, Germany
| | - M. Siepe
- University Medical Center Freiburg, Cardiovascular Surgery, Freiburg, Germany
| | - F. Beyersdorf
- University Medical Center Freiburg, Cardiovascular Surgery, Freiburg, Germany
| | - C. Schlensak
- University Medical Center Tuebingen, Thoracic and Cardiovascular Surgery, Tuebingen, Germany
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Ristow I, Li S, Demenescu R, Colic L, Li M, Walter H, Beier K, Krüger T, Schiffer B, Ponseti J, Walter M. EP 80. Sexual processing of pedophilic patients and healthy controls and the role of its metabolic markers – A fMRI and MRS study. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2016.05.129] [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: 11/28/2022]
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21
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Hellwich O, Rose A, Bien T, Malolepszy C, Mucha D, Krüger T. PATIENT REGISTRATION USING PHOTOGRAMMETRIC SURFACE RECONSTRUCTION FROM SMARTPHONE IMAGERY. ACTA ACUST UNITED AC 2016. [DOI: 10.5194/isprsarchives-xli-b5-829-2016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In navigated surgery the patient’s body has to be co-registered with presurgically acquired 3D data in order to enable navigation of the surgical instrument. For this purpose the body surface of the patient can be acquired by means of photogrammetry and co-registered to corresponding surfaces in the presurgical data. In this paper this task is exemplarily solved for 3D data of human heads using the face surface to establish correspondence. We focus on investigation of achieved geometric accuracies reporting positioning errors in the range of 1 mm.
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Reindl J, Pesek J, Krüger T, Wendler S, Nemitz S, Muckova P, Büchler R, Opitz S, Krieg N, Norgauer J, Rhode H. Proteomic biomarkers for psoriasis and psoriasis arthritis. J Proteomics 2016; 140:55-61. [DOI: 10.1016/j.jprot.2016.03.040] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 03/18/2016] [Accepted: 03/29/2016] [Indexed: 02/07/2023]
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Karck M, Conzelmann L, Easo J, Krüger T, Rylski B, Weigang E, Boening A. German Registry for Acute Aortic Dissection Type A: Structure, Results, and Future Perspectives. Thorac Cardiovasc Surg 2016; 65:77-84. [DOI: 10.1055/s-0036-1572436] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- M. Karck
- Department of Cardiac Surgery, Heidelberg University, Heidelberg, Germany
| | - L.O. Conzelmann
- Department of Cardiac Surgery, Helios Klinik, Karlsruhe, Germany
| | - J. Easo
- Department of Cardiac Surgery, Oldenburg University Hospital, Oldenburg, Germany
| | - T. Krüger
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - B. Rylski
- Department of Cardiovascular Surgery, University Hospital Freiburg, Freiburg, Germany
| | - E. Weigang
- Department of Vascular Surgery, Vascular Center Berlin-Brandenburg, Academic Hospital Hubertus, Berlin, Germany
| | - A. Boening
- Department of Cardiovascular Surgery, University Hospital Giessen, Giessen, Germany
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Muñoz C, Beyersdorf F, Carrel T, Schönhoff F, Schlensak C, Krüger T, Eckstein HH, Reutersberg B, Erbel R, Janosi A, Siepe M, Rylski B. How Does the Aortic Geometry Change When the Descending Aorta Dissects? Thorac Cardiovasc Surg 2016. [DOI: 10.1055/s-0036-1571541] [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: 10/22/2022]
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25
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Hanf B, Krüger T, Mattern D, Kniemeyer O, Brakhage A. Adaption of the filamentous fungus Aspergillus Nidulans to low temperature stress. Cryobiology 2015. [DOI: 10.1016/j.cryobiol.2015.10.005] [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: 11/25/2022]
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26
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Helm S, Kleimann A, Birkenstock A, Schuppner R, Bleich S, Krüger T, Kahl K, Frieling H. The use of ketamine in treatment-resistant major depression: a case study. Pharmacopsychiatry 2015. [DOI: 10.1055/s-0035-1557956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Krüger T, Veseli K, Schibilsky D, Wendel H, Lausberg H, Schneider W, Schlensak C. Regional and Directional Compliance of the Aortic Wall: ex vivo Dynamic Testing and Implications for Aortic Pathophysiology. Thorac Cardiovasc Surg 2015. [DOI: 10.1055/s-0035-1544481] [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: 10/24/2022]
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28
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Abstract
Semilocal pseudopotentials are used in combination with a density-functional approximation for the correlation energy and special optimized basis sets to investigate the sulphur halides SF, SF2, SF3, FSSF, SSF2, SCl, SCl2, ClSSCl and SSCl2. It turns out that the inclusion of d-orbitals in the basis set playes a significant role with respect to the quality of the calculated molecular parameters. Properties of SF3 are calculated for the first time, and the differences between the disulphur difluorides and the disulphur dichlorides are explained.
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Affiliation(s)
- T. Krüger
- Institut für Theoretische Chemie der Universität Stuttgart
| | - H. Preuß
- Institut für Theoretische Chemie der Universität Stuttgart
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29
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Wohlfarth K, Fiedler T, Kollewe K, Wegner F, Weisemann J, Adeli G, Alvermann S, Böselt S, Escher C, Garde N, Gingele S, Kaehler SB, Karatschai R, Krüger T, Schmidt T, Sikorra S, Tacik P, Wollmann J, Dengler R, Bigalke H, Rummel A. BoNT/D is effective in humans – but with higher dosing and shorter duration than BoNT/A. KLIN NEUROPHYSIOL 2014. [DOI: 10.1055/s-0034-1371325] [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: 10/25/2022]
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30
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Krüger T, Walker T, Nolte A, Secker S, Greiner TO, Neumann B, Wendel HP, Schlensak C. Veins under pressure: The relationship of arterial pressure to adhesion molecule expression and leukocyte adhesion in venous bypass grafts. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332460] [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: 10/27/2022]
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31
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Tews I, Krüger T, Hebeler K, Schwenk A. Neutron matter at next-to-next-to-next-to-leading order in chiral effective field theory. Phys Rev Lett 2013; 110:032504. [PMID: 23373917 DOI: 10.1103/physrevlett.110.032504] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Indexed: 06/01/2023]
Abstract
Neutron matter presents a unique system for chiral effective field theory because all many-body forces among neutrons are predicted to next-to-next-to-next-to-leading order (N(3)LO). We present the first complete N(3)LO calculation of the neutron matter energy. This includes the subleading three-nucleon forces for the first time and all leading four-nucleon forces. We find relatively large contributions from N(3)LO three-nucleon forces. Our results provide constraints for neutron-rich matter in astrophysics with controlled theoretical uncertainties.
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Affiliation(s)
- I Tews
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
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32
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Vörsmann P, Kaschwich C, Krüger T, Schnetter P, Wilkens CS. MEMS based integrated navigation systems for adaptive flight control of unmanned aircraft — State of the art and future developments. ACTA ACUST UNITED AC 2012. [DOI: 10.1134/s2075108712040116] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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33
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Krüger T, Conzelmann LO, Bonser RS, Borger MA, Czerny M, Wildhirt S, Carrel T, Mohr FW, Schlensak C, Weigang E. Acute aortic dissection type A. Br J Surg 2012; 99:1331-44. [DOI: 10.1002/bjs.8840] [Citation(s) in RCA: 51] [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] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Abstract
Background
Acute aortic dissection type A (AADA) is a life-threatening vascular emergency. Clinical presentation ranges from pain related to the acute event, collapse due to aortic rupture or pericardial tamponade, or manifestations of organ or limb ischaemia. The purpose of this review was to clarify important clinical issues of AADA management, with a focus on diagnostic and therapeutic challenges.
Methods
Based on a MEDLINE search the latest literature on this topic was reviewed. Results from the German Registry for Acute Aortic Dissection Type A (GERAADA) are also described.
Results
Currently, the perioperative mortality rate of AADA is below 20 per cent, the rate of definitive postoperative neurological impairment approaches 12 per cent and the long-term prognosis after surviving the acute phase of the disease is good. Many pathology- and therapy-associated factors influence the outcome of AADA, including prompt diagnosis with computed tomography and better cerebral protection strategies during aortic arch reconstruction. Endovascular technologies are emerging that may lead to less invasive treatment options.
Conclusion
AADA is an emergency that can present with a wide variety of clinical scenarios. Advances in the surgical management of this complex disease are improving outcomes.
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Affiliation(s)
- T Krüger
- Department of Cardiothoracic and Vascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - L O Conzelmann
- Department of Cardiothoracic and Vascular Surgery, Medical Centre of Johannes Gutenberg University Mainz, Mainz, Germany
| | - R S Bonser
- Department of Cardiac Surgery, Queen Elizabeth Hospital, University Hospital Birmingham NHS Trust and University of Birmingham, Birmingham, UK
| | - M A Borger
- Department of Cardiac Surgery, Leipzig Heart Centre, University of Leipzig, Leipzig, Germany
| | - M Czerny
- Department of Cardiovascular Surgery, University Hospital Berne, Berne, Switzerland
| | - S Wildhirt
- Department of Cardiothoracic and Vascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - T Carrel
- Department of Cardiovascular Surgery, University Hospital Berne, Berne, Switzerland
| | - F W Mohr
- Department of Cardiac Surgery, Leipzig Heart Centre, University of Leipzig, Leipzig, Germany
| | - C Schlensak
- Department of Cardiothoracic and Vascular Surgery, University Hospital Tübingen, Tübingen, Germany
| | - E Weigang
- Department of Cardiothoracic and Vascular Surgery, Medical Centre of Johannes Gutenberg University Mainz, Mainz, Germany
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Krüger T, Lisy M, Khalil M, Nagy Z, Lescan M, Stock UA, Schlensak S, Wildhirt SM. Matrix-based repair of acute Type-A aortic dissections as an alternative to conventional glue repair. Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297859] [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: 10/14/2022]
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Kornberger A, Kalender G, Krüger T, Lisy M, Schmid E, Wildhirt S, Stock UA. Is there evidence of “Aortic Dissections Weather”? Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297857] [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: 10/14/2022]
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Krüger T, Ghisari M, Yi C, Bonefeld-Jørgensen E. Levels and effect of serum pops on steroid hormone receptor function in Greenlandic Inuit. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.1002] [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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Abstract
In a suspension of extended objects such as colloidal particles, capsules or vesicles, the contribution of particles to the stress is usually evaluated by first determining the stress originating from a single particle (e.g. via integrating the fluid stress over the surface of a particle) and then adding up the contributions of individual particles. While adequate for a computation of the average stress over the entire system, this approach fails to correctly reproduce the local stress. In this work, we propose and validate a variant of the method of planes which overcomes this problem. The method is particularly suited for many-body interactions arising from, for example, shear and bending rigidity of red blood cells.
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Affiliation(s)
- T Krüger
- Max-Planck-Institut für Eisenforschung, Max-Planck-Strasse 1, 40237 Düsseldorf, Germany.
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Sack S, Schelp MK, Poppe S, Weber M, Krüger T, Geith S, Lieber M, Schleger S, Eichinger W, Menne J. [Aortic valve stenosis: transcatheter aortic valve implantation (TAVI) – transarterial or transapical approach]. Dtsch Med Wochenschr 2011; 136:417-26; quiz 427-30. [PMID: 21344357 DOI: 10.1055/s-0031-1274524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The calcified aortic stenosis is the dominating valve disease. Patients affected are most common elderly people in the 8 (th) or 9 (th) decade of their life who often show associated comorbidities like reduced left ventricular function, impaired renal function, pulmonary hypertension, and further diseases (Diabetes mellitus, stroke, COPD). In many cases perioperative morbidity and mortality are too high for surgical valve replacement and up to 30 % of patients are rejected. Nevertheless, prognosis of aortic stenosis is worse if the typical symptoms like dyspnea on exertion, syncope, and angina occur. The transcatheter aortic valve implantation is a new method treating this particular group of patients. The aortic valve bioprothesis consists of a balloon-expandable stent or a self-expandable frame, in which a valve of bovine or porcine pericardium is incorporated. The implantation is performed by retrograde access via the femoral or subclavian artery; the balloon-expandable prosthesis can also be implanted by transapical approach. Recently, the PARTNER trial and other studies demonstrate a high implantation success rate and better survival in comparison to standard therapy but exhibit also cerebral vascular and peripheral vascular complications. A further reduction of the available delivery systems and new types of valves which are under experimental tests and clinical evaluation contribute to this development.
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Affiliation(s)
- S Sack
- Klinik für Kardiologie, Pneumologie, Internistische Intensivmedizin und Zentrale Notaufnahme, Sektion Innere Medizin, Klinikum Schwabing, Städtisches Klinikum München GmbH, München.
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Krüger T, Sanchez CP, Lanzer M. Complementation of Saccharomyces cerevisiae pik1ts by a phosphatidylinositol 4-kinase from Plasmodium falciparum. Mol Biochem Parasitol 2010; 172:149-51. [DOI: 10.1016/j.molbiopara.2010.03.020] [Citation(s) in RCA: 12] [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] [Received: 01/28/2010] [Revised: 03/26/2010] [Accepted: 03/31/2010] [Indexed: 11/25/2022]
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Krüger T, Varnik F, Raabe D. Second-order convergence of the deviatoric stress tensor in the standard Bhatnagar-Gross-Krook lattice Boltzmann method. Phys Rev E Stat Nonlin Soft Matter Phys 2010; 82:025701. [PMID: 20866869 DOI: 10.1103/physreve.82.025701] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Revised: 06/15/2010] [Indexed: 05/29/2023]
Abstract
It is shown numerically that the deviatoric stress tensor is second-order accurate in the bulk Bhatnagar-Gross-Krook lattice Boltzmann (LB) method. In an earlier work [T. Krüger, Phys. Rev. E 79, 46704 (2009)], we have already predicted the second-order convergence. However, numerical simulations using a duct flow were not fully in line with this prediction. In particular, the convergence rate of the stress tensor was observed to depend on the LB boundary condition. In the present paper, we examine a pure bulk system, the decaying Taylor-Green vortex flow. Our prediction on the second-order accuracy of the stress tensor is unambiguously evidenced via these studies.
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Affiliation(s)
- T Krüger
- Max-Planck-Institut für Eisenforschung, Max-Planck-Strasse 1, 40237 Düsseldorf, Germany.
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Fallah MA, Myles VM, Krüger T, Sritharan K, Wixforth A, Varnik F, Schneider SW, Schneider MF. Acoustic driven flow and lattice Boltzmann simulations to study cell adhesion in biofunctionalized mu-fluidic channels with complex geometry. Biomicrofluidics 2010; 4:024106. [PMID: 20697583 PMCID: PMC2917880 DOI: 10.1063/1.3396449] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Accepted: 03/26/2010] [Indexed: 05/06/2023]
Abstract
Accurately mimicking the complexity of microvascular systems calls for a technology which can accommodate particularly small sample volumes while retaining a large degree of freedom in channel geometry and keeping the price considerably low to allow for high throughput experiments. Here, we demonstrate that the use of surface acoustic wave driven microfluidics systems successfully allows the study of the interrelation between melanoma cell adhesion, the matrix protein collagen type I, the blood clotting factor von Willebrand factor (vWF), and microfluidic channel geometry. The versatility of the tool presented enables us to examine cell adhesion under flow in straight and bifurcated microfluidic channels in the presence of different protein coatings. We show that the addition of vWF tremendously increases (up to tenfold) the adhesion of melanoma cells even under fairly low shear flow conditions. This effect is altered in the presence of bifurcated channels demonstrating the importance of an elaborate hydrodynamic analysis to differentiate between physical and biological effects. Therefore, computer simulations have been performed along with the experiments to reveal the entire flow profile in the channel. We conclude that a combination of theory and experiment will lead to a consistent explanation of cell adhesion, and will optimize the potential of microfluidic experiments to further unravel the relation between blood clotting factors, cell adhesion molecules, cancer cell spreading, and the hydrodynamic conditions in our microcirculatory system.
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Gehling M, Arndt C, Eberhart LHJ, Koch T, Krüger T, Wulf H. Postoperative analgesia with parecoxib, acetaminophen, and the combination of both: a randomized, double-blind, placebo-controlled trial in patients undergoing thyroid surgery. Br J Anaesth 2010; 104:761-7. [PMID: 20427369 DOI: 10.1093/bja/aeq096] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND We assessed the analgesic efficacy of parecoxib, acetaminophen, and the combination of both compared with placebo in patients undergoing elective thyroid or parathyroid surgery. METHODS We randomized 140 patients to receive one of the following i.v. treatments using a double-blinded double-dummy technique: placebo, 80 mg 24 h(-1) parecoxib, 5 g 24 h(-1) acetaminophen, or 80 mg parecoxib plus 5 g acetaminophen. We provided rescue analgesia with piritramide delivered by a patient-controlled analgesia device. We measured opioid consumption and pain intensity over 24 h after operation. RESULTS Patient characteristic data, anaesthetic, and surgical characteristics of the patients in the four groups were similar. Parecoxib, acetaminophen, and the combination significantly reduced opioid requirements during 24 h after surgery [mean (sd) 12.5 (10.9) mg for parecoxib, 14.2 (12.3) mg for acetaminophen, and 11.9 (10.7) mg for combination] compared with placebo [23.5 (15.3) mg, P<0.05]. However, the combination of parecoxib and acetaminophen did not have any advantage over individual drugs in terms of opioid consumption in our trial (P>0.05). CONCLUSIONS Parecoxib and acetaminophen effectively reduce postoperative opioid requirements after thyroid or parathyroid surgery. The combination of these drugs is not associated with a further reduction in opioid consumption.
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Affiliation(s)
- M Gehling
- Department of Anaesthesiology and Intensive Care Medicine, Philipps-University Marburg, Marburg, Germany.
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Abstract
The tumor suppressor p53 has been implicated in the regulation of ribosome biogenesis based on its inhibitory effect on RNA polymerase I (pol I)-dependent transcription. Consistent with this, p53 has been described in nucleoli, albeit under specific experimental conditions. Since data on the intranucleolar localization of p53 are controversial, we have analyzed in detail its subnucleolar distribution. Our results show that p53 does not localize to one of the well-known structural components of the nucleolus involved in ribosome biogenesis, but rather occupies distinct intranucleolar regions that constitute nucleolar cavities. When cells were treated with the proteasome inhibitor MG132, the size and frequency of p53-containing nucleolar cavities increased, and the protein partially colocalized with inactivated proteasomes. Importantly, p53 did not colocalize with pol I at the transcription sites in fibrillar centers (FCs) as has previously been reported. The observed intranucleolar distribution and accumulation of p53 raises the question of how the protein influences rDNA transcription in vivo.
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Affiliation(s)
- Tim Krüger
- Department of Cell and Developmental Biology, Biocenter, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Abstract
Rotational freedom of implant positional indices in two-piece implants was investigated. The aim of the study was to determine, analytically, the rotational freedom of three different positional index designs, based on the hypothesis that it is not influenced by their geometric principle. Regular polygonal, polygon profile, and cam-groove patterns were analyzed. Schematic descriptions were made and idealized equations developed. Parameters influencing the extent of rotational freedom were identified for the different positional index designs. A general equation that describes the rotational freedom of differently designed indices was also formulated. The present analysis showed that the rotational freedom of positional indices can be analytically calculated and is influenced by different parameters. The rotational freedom of the positional index of commonly used implant-abutment connections depends on their geometric design and size.
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Affiliation(s)
- W. Semper
- Dept. of Oral and Maxillofacial Surgery, Clinical Navigation and Robotics, Charité-Campus Virchow Clinic, Augusten-burger Platz 1, 13353 Berlin, Germany
| | - S. Kraft
- Dept. of Oral and Maxillofacial Surgery, Clinical Navigation and Robotics, Charité-Campus Virchow Clinic, Augusten-burger Platz 1, 13353 Berlin, Germany
| | - T. Krüger
- Dept. of Oral and Maxillofacial Surgery, Clinical Navigation and Robotics, Charité-Campus Virchow Clinic, Augusten-burger Platz 1, 13353 Berlin, Germany
| | - K. Nelson
- Dept. of Oral and Maxillofacial Surgery, Clinical Navigation and Robotics, Charité-Campus Virchow Clinic, Augusten-burger Platz 1, 13353 Berlin, Germany
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Abstract
Rotational freedom of the implant-abutment connection influences its screw joint stability; for optimization, influential factors need to be evaluated based on a previously developed closed formula. The underlying hypothesis is that the manufacturing tolerances, geometric pattern, and dimensions of the index do not influence positional stability. We used the dimensions of 5 commonly used implant systems with a clearance of 20 μm to calculate the extent of rotational freedom; a 3D simulation (SolidWorks) validated the analytical findings. Polygonal positional indices showed the highest degrees of rotational freedom. The polygonal profile displayed higher positional stability than the polygons, but less positional accuracy than the cam-groove connection. Features of a maximal rotation-safe positional index were determined. The analytical calculation of rotational freedom of implant positional indices is possible. Rotational freedom is dependent on the geometric design of the index and may be decreased by incorporating specific aspects into the positional index design.
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Affiliation(s)
- W. Semper
- Dept. of Oral and Maxillofacial Surgery, Clinical Navigation and Robotics, Charité-Campus Virchow Clinic, Augustenburger Platz 1, 13353 Berlin, Germany
| | - S. Kraft
- Dept. of Oral and Maxillofacial Surgery, Clinical Navigation and Robotics, Charité-Campus Virchow Clinic, Augustenburger Platz 1, 13353 Berlin, Germany
| | - T. Krüger
- Dept. of Oral and Maxillofacial Surgery, Clinical Navigation and Robotics, Charité-Campus Virchow Clinic, Augustenburger Platz 1, 13353 Berlin, Germany
| | - K. Nelson
- Dept. of Oral and Maxillofacial Surgery, Clinical Navigation and Robotics, Charité-Campus Virchow Clinic, Augustenburger Platz 1, 13353 Berlin, Germany
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Sigsgaard T, Bonefeld-Jørgensen EC, Hoffmann HJ, Bønløkke J, Krüger T. Microbial cell wall agents as an occupational hazard. Toxicol Appl Pharmacol 2008; 207:310-9. [PMID: 15992841 DOI: 10.1016/j.taap.2004.12.031] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2004] [Revised: 12/09/2004] [Accepted: 12/09/2004] [Indexed: 11/17/2022]
Abstract
Organic dusts cause inflammatory reactions in the tissues exposed. The lung and the cells lining the surface of the respiratory tract are a primary target. Many receptors have been shown to react specifically on the presence of microorganisms that are ubiquitous elements in organic dusts. There is a great variability in the individual response to organic dusts. Almost 50% of Caucasians are hyporesponders to LPS exposure, and people with alpha-1-antitrypsin deficiency are hyperresponsive to organic dust exposure. The diseases resulting from organic dust exposures include asthma, allergy, hypersensitivity pneumonitis and toxic pneumonitis (organic dust toxic syndrome). This paper deals with inflammation and the subsequent mechanism of disease as it is encountered in industries with these exposures. Toxicological studies including human experimental exposures and ex vivo studies of cells are described. Cellular reactions are mediated through the attachment of, e.g. LPS and beta (1,3)-D-glucan to lipopolysaccharide binding protein, CD14 and Toll-like receptors. The relation between protein release and the gene activation is described. Furthermore, studies of the individual susceptibility will be reviewed.
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Affiliation(s)
- T Sigsgaard
- Department of Environmental and Occupational Medicine, University of Aarhus, Vennelyst Boulevard 6, DK-8000 Aarhus C, Denmark.
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Abstract
A study of the influence of the local environment on the light-induced luminescence enhancement of CdSe/ZnS quantum dots (QD) embedded in silica colloids that are dispersed in various solvents is presented. The photoluminescence of the embedded QD is enhanced up to a factor of ten upon photoactivation by ultraviolet or visible light. This enhancement is strongly dependent on the local environment. The thickness-dependent permeability of the silica shell covering the QD controls the influence of the solvent on the QD. If foreign ions are present the activation state is stabilized after termination of the activation, whereas in their absence the process is partially reversible. A new qualitative model for the photoactivation of QD in various environments is developed. It comprises light-induced passivation and subsequent oxidation processes. The embedded QD also retain their fluorescence quantum yield inside living cells. Moreover, they can be activated for many hours in living cells by laser radiation in the visible regime.
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Affiliation(s)
- Sofia Dembski
- Lehrstuhl für Physikalische Chemie I Universität Würzburg Am Hubland, Germany
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48
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Abstract
Considerable efforts are being undertaken to elucidate the processes of ribosome biogenesis. Although various preribosomal RNP complexes have been isolated and molecularly characterized, the order of ribosomal protein (r-protein) addition to the emerging ribosome subunits is largely unknown. Furthermore, the correlation between the ribosome assembly pathway and the structural organization of the dedicated ribosome factory, the nucleolus, is not well established. We have analyzed the nucleolar localization of several early binding r-proteins in human cells, applying various methods, including live-cell imaging and electron microscopy. We have located all examined r-proteins (S4, S6, S7, S9, S14, and L4) in the granular component (GC), which is the nucleolar region where later pre-ribosomal RNA (rRNA) processing steps take place. These results imply that early binding r-proteins do not assemble with nascent pre-rRNA transcripts in the dense fibrillar component (DFC), as is generally believed, and provide a link between r-protein assembly and the emergence of distinct granules at the DFC–GC interface.
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Affiliation(s)
- Tim Krüger
- Department of Cell and Developmental Biology, Biocenter, University of Würzburg, Würzburg, Germany
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Krüger T, Seiberth V. Wiederanlage der Netzhaut nach akuter Retinopathia prämaturorum Stadium 5+. Klin Monbl Augenheilkd 2006. [DOI: 10.1055/s-2006-958779] [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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Drognitz O, Thorn D, Krüger T, Gatermann SG, Iven H, Bruch HP, Muhl E. Release of vancomycin and teicoplanin from a plasticized and resorbable gelatin sponge: in vitro investigation of a new antibiotic delivery system with glycopeptides. Infection 2006; 34:29-34. [PMID: 16501900 DOI: 10.1007/s15010-006-1067-1] [Citation(s) in RCA: 3] [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] [Received: 07/10/2001] [Accepted: 04/05/2005] [Indexed: 10/25/2022]
Abstract
BACKGROUND The aim of this study was to evaluate the efficacy of sustained release of vancomycin and teicoplanin from a resorbable gelatin glycerol sponge, in order to establish a new delivery system for local anti-infective therapy. MATERIALS AND METHODS 60 plasticized glycerol gelatin sponges containing either 10 or 20% gelatin (w/v) were incubated in vancomycin or teicoplanin solution at 20 degrees C for either 1 or 24 h. In vitro release properties of the sponges were investigated over a period of 1 week by determining the levels of vancomycin and teicoplanin eluted in plasma using fluorescent polarization immunoassay. The rate constant and the half-life for the antibiotic release of each group were calculated by linear regression assuming first order kinetics. RESULTS Presoaking for 24 h was associated with a significant increase in the total antibiotic release in all groups opposed to 1 h of incubation, except for the 10% sponges presoaked in teicoplanin. Doubling the gelatin content of the sponges from 10 to 20% significantly increased the total release of antibiotic load only in teicoplanin-containing sponges after 24 h incubation. In all corresponding groups investigated, release of vancomycin was more prolonged compared to teicoplanin, which allowed a gradual release beyond 5 days. The half-life (h +/- SEM) of both types of vancomycin-containing sponges was significantly prolonged by 24 h incubation in comparison to 1 h incubation (29.1 +/- 5.9 vs 5.9 +/- 1.0; p < 0.001, 30.0 +/- 2.1 vs 11.1 +/- 1.9; p < 0.001). However, neither doubling the gelatin content of the sponges nor a prolonged incubation was associated with a significantly prolonged delivery of teicoplanin. CONCLUSION This study demonstrated a better diffusion-controlled release of vancomycin-impregnated glycerol gelatin sponges compared to those pretreated with teicoplanin. The plasticized glycerol gelatin sponge may be a promising carrier for the application of vancomycin to infected wounds for local anti-infective therapy.
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Affiliation(s)
- O Drognitz
- Universitätsklinikum Freiburg, Klinik und Poliklinik für Chirurgie, Abteilung für Allgemein- und Viszeralchirurgie, Hugstetter Str. 55, 79106 Freiburg i. Brsg., Germany.
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