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Germer CT, Herrmann P, Hofmann S. Nachruf auf Jörg Rüdiger Siewert. Chirurgie (Heidelb) 2024; 95:219-220. [PMID: 38360871 DOI: 10.1007/s00104-024-02046-5] [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] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Affiliation(s)
- C-T Germer
- Klinik für Allgemein‑, Viszeral‑, Transplantations‑, Gefäß- und Kinderchirurgie, Universitätsklinikum Würzburg, Zentrum Operative Medizin (ZOM), Oberdürrbacher Str. 6, 97080, Würzburg, Deutschland.
| | - P Herrmann
- Springer Medizin Verlag, Fachzeitschriften Medizin, Heidelberg, Deutschland
| | - S Hofmann
- Springer Medizin Verlag, Fachzeitschriften Medizin, Heidelberg, Deutschland
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2
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Vis MAM, Zhao F, Bodelier ESR, Bood CM, Bulsink J, van Doeselaar M, Amirabadi HE, Ito K, Hofmann S. Osteogenesis and osteoclastogenesis on a chip: Engineering a self-assembling 3D coculture. Bone 2023; 173:116812. [PMID: 37236415 DOI: 10.1016/j.bone.2023.116812] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 05/20/2023] [Accepted: 05/22/2023] [Indexed: 05/28/2023]
Abstract
Healthy bone is maintained by the process of bone remodeling. An unbalance in this process can lead to pathologies such as osteoporosis which are often studied with animal models. However, data from animals have limited power in predicting the results that will be obtained in human clinical trials. In search for alternatives to animal models, human in vitro models are emerging as they address the principle of reduction, refinement, and replacement of animal experiments (3Rs). At the moment, no complete in vitro model for bone-remodeling exists. Microfluidic chips offer great possibilities, particularly because of the dynamic culture options, which are crucial for in vitro bone formation. In this study, a scaffold free, fully human, 3D microfluidic coculture model of bone remodeling is presented. A bone-on-a-chip coculture system was developed in which human mesenchymal stromal cells differentiated into the osteoblastic lineage and self-assembled into scaffold free bone-like tissues with the shape and dimensions of human trabeculae. Human monocytes were able to attach to these tissues and to fuse into multinucleated osteoclast-like cells, establishing the coculture. Computational modeling was used to determine the fluid flow induced shear stress and strain in the formed tissue. Furthermore, a set-up was developed allowing for long-term (35 days) on-chip cell culture with benefits including continuous fluid-flow, low bubble formation risk, easy culture medium exchange inside the incubator and live cell imaging options. This on-chip coculture is a crucial advance towards developing in vitro bone remodeling models to facilitate drug testing.
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Affiliation(s)
- M A M Vis
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands.
| | - F Zhao
- Department of Biomedical Engineering and Zienkiewicz Centre for Computational Engineering, Faculty of Science and Engineering, Swansea University, Swansea, United Kingdom
| | - E S R Bodelier
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands
| | - C M Bood
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands
| | - J Bulsink
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands
| | - M van Doeselaar
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands
| | | | - K Ito
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands
| | - S Hofmann
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands
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3
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Germer CT, Hofmann S. [Julius-Springer award for surgery 2023]. Chirurgie (Heidelb) 2023; 94:417-418. [PMID: 37079034 DOI: 10.1007/s00104-023-01884-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 04/21/2023]
Affiliation(s)
- C-T Germer
- Klinik für Allgemein‑, Viszeral‑, Transplantations‑, Gefäß- und Kinderchirurgie, Universitätsklinikum Würzburg, Oberdürrbacher Str. 6, 97080, Würzburg, Deutschland.
| | - S Hofmann
- Springer Medizin Verlag GmbH, Heidelberg, Deutschland
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4
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Gumprich A, Liedtke J, Beck S, Chirca I, Potočnik T, Alexander-Webber JA, Hofmann S, Tappertzhofen S. Buried graphene heterostructures for electrostatic doping of low-dimensional materials. Nanotechnology 2023; 34:265203. [PMID: 36758234 DOI: 10.1088/1361-6528/acbaa2] [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] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 02/08/2023] [Indexed: 06/18/2023]
Abstract
The fabrication and characterization of steep slope transistor devices based on low-dimensional materials requires precise electrostatic doping profiles with steep spatial gradients in order to maintain maximum control over the channel. In this proof-of-concept study we present a versatile graphene heterostructure platform with three buried individually addressable gate electrodes. The platform is based on a vertical stack of embedded titanium and graphene separated by an intermediate oxide to provide an almost planar surface. We demonstrate the functionality and advantages of the platform by exploring transfer and output characteristics at different temperatures of carbon nanotube field-effect transistors with different electrostatic doping configurations. Furthermore, we back up the concept with finite element simulations to investigate the surface potential. The presented heterostructure is an ideal platform for analysis of electrostatic doping of low-dimensional materials for novel low-power transistor devices.
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Affiliation(s)
- A Gumprich
- Chair for Micro- and Nanoelectronics, Department of Electrical Engineering and Information Technology, TU Dortmund University, Martin-Schmeisser-Weg 4-6, D-44227, Dortmund, Germany
| | - J Liedtke
- Chair for Micro- and Nanoelectronics, Department of Electrical Engineering and Information Technology, TU Dortmund University, Martin-Schmeisser-Weg 4-6, D-44227, Dortmund, Germany
| | - S Beck
- Chair for Micro- and Nanoelectronics, Department of Electrical Engineering and Information Technology, TU Dortmund University, Martin-Schmeisser-Weg 4-6, D-44227, Dortmund, Germany
| | - I Chirca
- Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | - T Potočnik
- Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | - J A Alexander-Webber
- Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | - S Hofmann
- Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | - S Tappertzhofen
- Chair for Micro- and Nanoelectronics, Department of Electrical Engineering and Information Technology, TU Dortmund University, Martin-Schmeisser-Weg 4-6, D-44227, Dortmund, Germany
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5
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Tappertzhofen S, Braeuninger-Weimer P, Gumprich A, Chirca I, Potočnik T, Alexander-Webber JA, Hofmann S. Transfer-free graphene passivation of sub 100 nm thin Pt and Pt–Cu electrodes for memristive devices. SN Appl Sci 2023. [DOI: 10.1007/s42452-023-05314-x] [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: 02/25/2023] Open
Abstract
AbstractMemristive switches are among the most promising building blocks for future neuromorphic computing. These devices are based on a complex interplay of redox reactions on the nanoscale. Nanoionic phenomena enable non-linear and low-power resistance transition in ultra-short programming times. However, when not controlled, the same electrochemical reactions can result in device degradation and instability over time. Two-dimensional barriers have been suggested to precisely manipulate the nanoionic processes. But fabrication-friendly integration of these materials in memristive devices is challenging.Here we report on a novel process for graphene passivation of thin platinum and platinum/copper electrodes. We also studied the level of defects of graphene after deposition of selected oxides that are relevant for memristive switching.
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Engesser C, Henkel M, Stieltjes B, Fassbind S, Alargkof V, Engesser J, Walter M, Elyan A, Studer J, Sutter S, Eckert C, Dugas S, Hofmann S, Seifert H, Stalder A, Cornford P, Wetterauer C. Clinical decision making in prostate cancer care - Evaluation of EAU-guidelines use and novel decision support software. Eur Urol 2023. [DOI: 10.1016/s0302-2838(23)01033-3] [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: 02/12/2023]
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Chen B, Prats RG, Li G, Jansen Y, Prabhu A, Remco M, Lutz B, Hofmann S, Herzig S, Steffens S. Endothelial cannabinoid receptor CB1 deficiency decreases oxLDL uptake and attenuates vascular inflammation in atherosclerosis. Atherosclerosis 2022. [DOI: 10.1016/j.atherosclerosis.2022.06.058] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Borradori L, Van Beek N, Feliciani C, Tedbirt B, Antiga E, Bergman R, Böckle BC, Caproni M, Caux F, Chandran NS, Cianchini G, Daneshpazhooh M, De D, Didona D, Di Zenzo GM, Dmochowski M, Drenovska K, Ehrchen J, Goebeler M, Groves R, Günther C, Horvath B, Hertl M, Hofmann S, Ioannides D, Itzlinger-Monshi B, Jedličková J, Kowalewski C, Kridin K, Lim YL, Marinovic B, Marzano AV, Mascaro JM, Meijer JM, Murrell D, Patsatsi K, Pincelli C, Prost C, Rappersberger K, Sárdy M, Setterfield J, Shahid M, Sprecher E, Tasanen K, Uzun S, Vassileva S, Vestergaard K, Vorobyev A, Vujic I, Wang G, Wozniak K, Yayli S, Zambruno G, Zillikens D, Schmidt E, Joly P. Updated S2 K guidelines for the management of bullous pemphigoid initiated by the European Academy of Dermatology and Venereology (EADV). J Eur Acad Dermatol Venereol 2022; 36:1689-1704. [PMID: 35766904 DOI: 10.1111/jdv.18220] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 05/04/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND Bullous pemphigoid (BP) is the most common autoimmune subepidermal blistering disease of the skin and mucous membranes. This disease typically affects the elderly and presents with itch and localized or, most frequently, generalized bullous lesions. A subset of patients only develops excoriations, prurigo-like lesions, and eczematous and/or urticarial erythematous lesions. The disease, which is significantly associated with neurological disorders, has high morbidity and severely impacts the quality of life. OBJECTIVES AND METHODOLOGY The Autoimmune blistering diseases Task Force of the European Academy of Dermatology and Venereology sought to update the guidelines for the management of BP based on new clinical information, and new evidence on diagnostic tools and interventions. The recommendations are either evidence-based or rely on expert opinion. The degree of consent among all task force members was included. RESULTS Treatment depends on the severity of BP and patients' comorbidities. High-potency topical corticosteroids are recommended as the mainstay of treatment whenever possible. Oral prednisone at a dose of 0.5 mg/kg/day is a recommended alternative. In case of contraindications or resistance to corticosteroids, immunosuppressive therapies, such as methotrexate, azathioprine, mycophenolate mofetil or mycophenolate acid, may be recommended. The use of doxycycline and dapsone is controversial. They may be recommended, in particular, in patients with contraindications to oral corticosteroids. B-cell-depleting therapy and intravenous immunoglobulins may be considered in treatment-resistant cases. Omalizumab and dupilumab have recently shown promising results. The final version of the guideline was consented to by several patient organizations. CONCLUSIONS The guidelines for the management of BP were updated. They summarize evidence- and expert-based recommendations useful in clinical practice.
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Affiliation(s)
- L Borradori
- Department of Dermatology, Inselspital, Bern University Hospital, Bern, Switzerland
| | - N Van Beek
- Department of Dermatology, University of Lübeck, Lübeck, Germany
| | - C Feliciani
- Dermatology Unit, Department of Medicine and Surgery, University Hospital, University of Parma, Italy
| | - B Tedbirt
- Department of Dermatology, Rouen University Hospital, Referral Center for Autoimmune Bullous Diseases, Referral Center for Autoimmune Bullous Diseases, Rouen University Hospital, INSERM U1234, Normandie University, Rouen, France
| | - E Antiga
- Section of Dermatology, Department of Health Sciences, University of Florence, Florence, Italy
| | - R Bergman
- Department of Dermatology, Rambam Health Care Campus, Haifa, Israel.,Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - B C Böckle
- Department of Dermatology, Venereology & Allergology, Innsbruck Medical University, Innsbruck, Austria
| | - M Caproni
- Department of Health Sciences, Section of Dermatology, AUSL Toscana Centro, Rare Diseases Unit, European Reference Network-Skin Member, University of Florence, Italy
| | - F Caux
- Department of Dermatology and Referral Center for Autoimmune Bullous Diseases, Groupe Hospitalier Paris Seine-Saint-Denis, AP-HP and University Paris 13, Bobigny, France
| | - N S Chandran
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - G Cianchini
- Department of Dermatology, Ospedale Classificato Cristo Re, Rome, Italy
| | - M Daneshpazhooh
- Department of Dermatology, Autoimmune Bullous Diseases Research Center, Razi Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - D De
- Department of Dermatology, Venereology and Leprology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - D Didona
- Department of Dermatology and Allergology, Philipps University, Marburg, Germany
| | - G M Di Zenzo
- Laboratory of Molecular and Cell Biology, Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Rome, Italy
| | - M Dmochowski
- Autoimmune Blistering Dermatoses Section, Department of Dermatology, Poznan University of Medical Sciences, Poznan, Poland
| | - K Drenovska
- Department of Dermatology, Medical University of Sofia, Sofia, Bulgaria
| | - J Ehrchen
- Department of Dermatology, University of Münster, Münster, Germany
| | - M Goebeler
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany
| | - R Groves
- St. John's Institute of Dermatology, Viapath Analytics LLP, St. Thomas' Hospital, London, UK.,Division of Genetics and Molecular Medicine, King's College London, Guy's Hospital, London, UK
| | - C Günther
- Department of Dermatology, Carl Gustav Carus University Hospital, Technische Universität Dresden, Dresden, Germany
| | - B Horvath
- Department of Dermatology, Center for Blistering Diseases, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - M Hertl
- Department of Dermatology and Allergology, Philipps University, Marburg, Germany
| | - S Hofmann
- Department of Dermatology, Allergy and Dermatosurgery, Helios University Hospital Wuppertal, University Witten, Herdecke, Germany
| | - D Ioannides
- 1st Department of Dermatology-Venereology, Hospital of Skin and Venereal Diseases, Aristotle University Medical School, Thessaloniki, Greece
| | - B Itzlinger-Monshi
- Department of Dermatology, Venereology and Allergy, Clinical Center Landstrasse, Academic Teaching Hospital of the Medical University of Vienna, Vienna, Austria.,Medical Faculty, The Sigmund Freud Private University, Vienna, Austria
| | - J Jedličková
- Department of Dermatovenereology, Masaryk University, University Hospital St. Anna, Brno.,Department of Dermatovenereology, University Hospital Brno, Brno, Czech Republic
| | - C Kowalewski
- Department Dermatology and Immunodermatology, Medical University of Warsaw, Warsaw, Poland
| | - K Kridin
- National Skin Centre, Singapore, Singapore
| | - Y L Lim
- Department of Dermatology and Venereology, School of Medicine, University Hospital Centre Zagreb, University of Zagreb, Zagreb, Croatia
| | - B Marinovic
- Dermatology Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - A V Marzano
- Dermatology Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy
| | - J-M Mascaro
- Department of Dermatology, Hospital Clínic de Barcelona, Universitat de Barcelona, Barcelona, Spain
| | - J M Meijer
- Department of Dermatology, Center for Blistering Diseases, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - D Murrell
- Department of Dermatology, St George Hospital, University of New South Wales, Sydney, New South Wales, Australia
| | - K Patsatsi
- 2nd Department of Dermatology, Autoimmune Bullous Diseases Unit, Aristotle University School of Medicine, Papageorgiou General Hospital, Thessaloniki, Greece
| | - C Pincelli
- DermoLab, Institute of Dermatology, University of Modena and Reggio Emilia, Modena, Italy
| | - C Prost
- Department of Dermatology and Referral Center for Autoimmune Bullous Diseases, Groupe Hospitalier Paris Seine-Saint-Denis, AP-HP and University Paris 13, Bobigny, France
| | - K Rappersberger
- Department of Dermatology, Venereology and Allergy, Clinical Center Landstrasse, Academic Teaching Hospital of the Medical University of Vienna, Vienna, Austria.,Medical Faculty, The Sigmund Freud Private University, Vienna, Austria.,Abteilung Dermatologie, Venerologie und Allergologie, Lehrkrankenhaus der Medizinischen Universität Wien, Austria
| | - M Sárdy
- Department of Dermatology and Allergology, Ludwig Maximilian University, Munich, Germany.,Department of Dermatology, Venereology and Dermatooncology, Semmelweis University, Budapest, Hungary
| | - J Setterfield
- Department of Oral Medicine, St John's Institute of Dermatology, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - M Shahid
- Department of Dermatology, Medical University, Sofia, Bulgaria
| | - E Sprecher
- Division of Dermatology, Tel Aviv Sourasky Medical Center and Department of Human Molecular Genetics & Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - K Tasanen
- Department of Dermatology, the PEDEGO Research Unit, University of Oulu and Medical Research Center Oulu, Oulu University Hospital, Oulu, Finland
| | - S Uzun
- Department of Dermatology and Venereology, Akdeniz University Faculty of Medicine, Antalya, Turkey
| | - S Vassileva
- Department of Dermatology, Medical University, Sofia, Bulgaria
| | - K Vestergaard
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - A Vorobyev
- Department of Dermatology, University of Lübeck, Lübeck, Germany.,Center for Research on Inflammation of the Skin, University of Lübeck, Lübeck, Germany
| | - I Vujic
- Department of Dermatology, Venereology and Allergy, Clinical Center Landstrasse, Academic Teaching Hospital of the Medical University of Vienna, Vienna, Austria.,Medical Faculty, The Sigmund Freud Private University, Vienna, Austria
| | - G Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - K Wozniak
- National Skin Centre, Singapore, Singapore
| | - S Yayli
- Department of Dermatology, School of Medicine, Koç University, Istanbul, Turkey
| | - G Zambruno
- Genetics and Rare Diseases Research Division, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - D Zillikens
- Department of Dermatology, University of Lübeck, Lübeck, Germany.,Center for Research on Inflammation of the Skin, University of Lübeck, Lübeck, Germany
| | - E Schmidt
- Department of Dermatology, University of Lübeck, Lübeck, Germany.,Lübeck Institute of Experimental Dermatology (LIED), University of Lübeck, Lübeck, Germany
| | - P Joly
- Department of Dermatology, Rouen University Hospital, Referral Center for Autoimmune Bullous Diseases, Referral Center for Autoimmune Bullous Diseases, Rouen University Hospital, INSERM U1234, Normandie University, Rouen, France
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Germer CT, Hofmann S. [Julius-Springer award for surgery 2022]. Chirurg 2022; 93:577-578. [PMID: 35471661 DOI: 10.1007/s00104-022-01651-6] [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: 11/30/2022]
Affiliation(s)
- C-T Germer
- Klinik für Allgemein‑, Viszeral‑, Transplantations‑, Gefäß- und Kinderchirurgie, Universitätsklinikum Würzburg, Oberdürrbacher Str. 6, 97080, Würzburg, Deutschland.
| | - S Hofmann
- Springer Medizin Verlag GmbH, Heidelberg, Deutschland
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Andrés Sastre E, Nossin Y, Jansen I, Kops N, Intini C, Witte-Bouma J, van Rietbergen B, Hofmann S, Ridwan Y, Gleeson JP, O'Brien FJ, Wolvius EB, van Osch GJVM, Farrell E. A new semi-orthotopic bone defect model for cell and biomaterial testing in regenerative medicine. Biomaterials 2021; 279:121187. [PMID: 34678648 DOI: 10.1016/j.biomaterials.2021.121187] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 10/08/2021] [Accepted: 10/14/2021] [Indexed: 02/07/2023]
Abstract
In recent decades, an increasing number of tissue engineered bone grafts have been developed. However, expensive and laborious screenings in vivo are necessary to assess the safety and efficacy of their formulations. Rodents are the first choice for initial in vivo screens but their size limits the dimensions and number of the bone grafts that can be tested in orthotopic locations. Here, we report the development of a refined murine subcutaneous model for semi-orthotopic bone formation that allows the testing of up to four grafts per mouse one order of magnitude greater in volume than currently possible in mice. Crucially, these defects are also "critical size" and unable to heal within the timeframe of the study without intervention. The model is based on four bovine bone implants, ring-shaped, where the bone healing potential of distinct grafts can be evaluated in vivo. In this study we demonstrate that promotion and prevention of ossification can be assessed in our model. For this, we used a semi-automatic algorithm for longitudinal micro-CT image registration followed by histological analyses. Taken together, our data supports that this model is suitable as a platform for the real-time screening of bone formation, and provides the possibility to study bone resorption, osseointegration and vascularisation.
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Affiliation(s)
- E Andrés Sastre
- Department of Oral and Maxillofacial Surgery, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Y Nossin
- Department of Otorhinolaryngology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - I Jansen
- Department of Oral and Maxillofacial Surgery, Erasmus University Medical Center, Rotterdam, the Netherlands; Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - N Kops
- Department of Orthopaedics and Sports Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - C Intini
- Tissue Engineering Research Group, Department of Anatomy and Regenerative Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - J Witte-Bouma
- Department of Oral and Maxillofacial Surgery, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - B van Rietbergen
- Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Department of Orthopaedic Surgery, Research School CAPHRI, Maastricht University Medical Center, Maastricht, the Netherlands
| | - S Hofmann
- Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Y Ridwan
- Department of Molecular Genetics, Erasmus University Medical Center, Rotterdam, the Netherlands; Department of Radiology and Nuclear Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - J P Gleeson
- Tissue Engineering Research Group, Department of Anatomy and Regenerative Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - F J O'Brien
- Tissue Engineering Research Group, Department of Anatomy and Regenerative Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland; SFI Advanced Materials and Bioengineering Research (AMBER) Center, Royal College of Surgeons in Ireland and Trinity College Dublin, Dublin, Ireland; Trinity Center for Biomedical Engineering, Trinity College Dublin, Dublin, Ireland
| | - E B Wolvius
- Department of Oral and Maxillofacial Surgery, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - G J V M van Osch
- Department of Otorhinolaryngology, Erasmus University Medical Center, Rotterdam, the Netherlands; Department of Orthopaedics and Sports Medicine, Erasmus University Medical Center, Rotterdam, the Netherlands; Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, Delft, the Netherlands
| | - E Farrell
- Department of Oral and Maxillofacial Surgery, Erasmus University Medical Center, Rotterdam, the Netherlands.
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Hofmann FJ, Hofmann S, Doerr O, Blachutzik F, Keranov S, Widmann L, Boeder NF, Hamm C, Nef HM, Kim W. Artificial intelligence to improve decision making in transcatheter aortic valve implantation. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1653] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Background
The current state of the art in the diagnosis and treatment of cardiovascular diseases has been based on evidence resulting from traditional trials as well as years of clinical experience. Due to interindividual differences and a huge number of possible cofounders, in interventional cardiology a linear algorithm is usually not able to precisely estimate individual risk, therapy, or outcome. With the technological evolution in deep machine learning (ML) and artificial intelligence (AI), clinicians may now address aspects that might not have been investigated previously, as supercomputers may handle the plethora of data that are generated as part of treatment. Ultimately, treatment recommendations and decisions may be made on a personalized level.
Purpose
The aim of this study was to apply AI to routine clinical practice to improve decision making in transcatheter aortic valve implantation (TAVI) to determine the best type and size of prosthesis personalized for each patient with pre-procedural risk stratification.
Methods
All patients included in the study were undergoing TAVI. To predict the clinical outcomes we applied a random forest classification, a ML method with high interpretability. For baseline data 58 features were chosen, including valve type and size used. After removing highly collinear features with a certain variance inflation factor, feature selection was based on impurity-based feature importance as well as permutation importance. The performance of the estimators was evaluated by a five-fold nested stratified cross-validation. To evaluate the model ROC and mean AUC scores were chosen.
Results
A total of 3882 patient datasets were included in this trial. The baseline characteristics were consistent with a high cardiovascular risk typical of this collective. Device success was achieved in 83.3%, pacemaker implantation was necessary in 12.2%, and aortic valvular insufficiency was observed in 2.5%. The 30-day mortality was 3.4% and one-year mortality was 12.7%. The mean AUC for the outcome parameters device success, aortic valvular insufficiency, any pacemaker operation, and 30-day and one-year mortality after five-fold cross validation were 0.61±0.03, 0.71±0.04, 0.66±0.04, 0.67±0.03, and 0.69±0.01, respectively.
Conclusions
We report preliminary data concerning a promising method to improve decision making in the context of TAVI evaluation and planning using ML algorithm. We showed the feasibility with acceptable AUC values for all outcome parameters. Thus, the integration of AI in TAVI strategy planning process offers a valuable tool providing patient focused personalized therapy.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- F J Hofmann
- University hospital Giessen and Marburg, Giessen, Germany
| | - S Hofmann
- University of Applied Sciences Mittelhessen, Faculty of Health Sciences, Giessen, Germany
| | - O Doerr
- University of Applied Sciences Mittelhessen, Faculty of Health Sciences, Giessen, Germany
| | - F Blachutzik
- University hospital Giessen and Marburg, Giessen, Germany
| | - S Keranov
- University hospital Giessen and Marburg, Giessen, Germany
| | - L Widmann
- University hospital Giessen and Marburg, Giessen, Germany
| | - N F Boeder
- University hospital Giessen and Marburg, Giessen, Germany
| | - C Hamm
- University hospital Giessen and Marburg, Giessen, Germany
| | - H M Nef
- University hospital Giessen and Marburg, Giessen, Germany
| | - W Kim
- Kerckhoff Heart and Thorax Center, Bad Nauheim, Germany
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Pietsch M, Hochegger M, Djahani O, Hofmann S, Mlaker G, Eder-Halbedl M, Hofstätter T. A two-stage approach to primary TKA using articulating antibiotic-loaded spacers improve function and eradicate infection in septic arthritic knees. Knee Surg Sports Traumatol Arthrosc 2021; 29:3186-3194. [PMID: 32556435 DOI: 10.1007/s00167-020-06106-1] [Citation(s) in RCA: 3] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 06/11/2020] [Indexed: 12/01/2022]
Abstract
PURPOSE The treatment of an infected arthritic knee might be challenging. The failure rate has been reported to be high for open or arthroscopic debridement. A subsequently high rate of infection has been noted in these patients undergoing primary total knee arthroplasty (TKA). In the present study, a two-stage approach using an articulating spacer was used. The hypothesis was that the procedure would eradicate the infection and improve pain and function in these patients. METHODS A total of 16 consecutive patients were enrolled in this retrospective study. The mean follow-up time was 6.1 years (range 2.0-9.9 years). Patients with advanced osteoarthritis and infection of the knee were included. All patients had previously undergone one or more failed arthroscopic or open procedures for the eradication of infection. All patients received the same homemade metal-on-plastic articulating antibiotic spacer. Double antibiotic therapy was given for 2 weeks intravenously and orally for 4 weeks. TKA implantation was performed 6 weeks after the first stage. RESULTS The infection was eradicated without recurrence in all patients. The functional results were significantly improved, and pain was significantly reduced after spacer and TKA implantation. The mean amount of knee flexion was 95 ± 30° preoperatively, and it increased to 109 ± 14° (p = 0.012) after spacer implantation and to 119 ± 10° (p = 0.002) after TKA implantation. The mean KSS objective was 58 ± 12 preoperatively, and it increased to 75 ± 14 (p < 0.0001) after spacer implantation and to 96 ± 3 (p < 0.0001) after TKA implantation. The mean KSS function was 17 ± 11 preoperatively, and it increased to 46 ± 10 (p < 0.0001) after spacer implantation and to 86 ± 6 (p < 0.0001) after TKA implantation. The mean VAS score was 65 ± 11 preoperatively, and it decreased to 2 ± 4 (p < 0.0001) after spacer implantation and to 1 ± 2 (p < 0.0001) after TKA implantation. CONCLUSION The two-stage procedure for the treatment of infected arthritic knees after failed eradication surgery was effective in all patients. Using an antibiotic articulating metal-on-plastic cement spacer showed improved functional results between the stages and at the final follow-up. No intra- or postoperative complications occurred.
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Affiliation(s)
- M Pietsch
- Department of Orthopaedic Surgery, Orthopaedic Hospital Stolzalpe (LKH Murtal), Stolzalpe 38, 8852, Stolzalpe, Austria.
| | - M Hochegger
- Department of Orthopaedic Surgery, Orthopaedic Hospital Stolzalpe (LKH Murtal), Stolzalpe 38, 8852, Stolzalpe, Austria
| | - O Djahani
- Department of Orthopaedic Surgery, Orthopaedic Hospital Stolzalpe (LKH Murtal), Stolzalpe 38, 8852, Stolzalpe, Austria
| | - S Hofmann
- Department of Orthopaedic Surgery, Orthopaedic Hospital Stolzalpe (LKH Murtal), Stolzalpe 38, 8852, Stolzalpe, Austria
| | - G Mlaker
- Department of Orthopaedic Surgery, Orthopaedic Hospital Stolzalpe (LKH Murtal), Stolzalpe 38, 8852, Stolzalpe, Austria
| | - M Eder-Halbedl
- Department of Orthopaedic Surgery, Orthopaedic Hospital Stolzalpe (LKH Murtal), Stolzalpe 38, 8852, Stolzalpe, Austria
| | - Th Hofstätter
- Department of Orthopaedic and Trauma Surgery, Paracelsus Medical University Salzburg, Müllner Hauptstraße 48, 5020, Salzburg, Austria
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Schauer F, Mai S, Hofmann S, Mai Y, Izumi K, Kern J, Nishie W, Kiritsi D. LB710 Detection of novel BP180 epitopes in Pemphigoid Gestationis. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.07.080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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Fitschen J, Hofmann S, Wutz J, Kameke A, Hoffmann M, Wucherpfennig T, Schlüter M. Novel evaluation method to determine the local mixing time distribution in stirred tank reactors. Chemical Engineering Science: X 2021. [DOI: 10.1016/j.cesx.2021.100098] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Germer CT, Hofmann S. Julius-Springer-Preis für Chirurgie und weitere Ehrungen 2021. Chirurg 2021. [DOI: 10.1007/s00104-021-01422-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lehmann L, Hofmann S, Dirschka T, Lehmann P. Induktion einer strickleiterartigen Narbe an der Wange einer 28-jährigen Frau nach Laserung eines Naevus araneus mittels KTP-Laser. Aktuelle Dermatologie 2021. [DOI: 10.1055/a-1437-6105] [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: 10/21/2022]
Abstract
ZusammenfassungDie 28-jährige Patientin stellte sich zur Behandlung einer kosmetisch störenden Gefäßläsion an der Wange vor. Es wurde eine Lasertherapie vorgeschlagen und vereinbart. Es entstanden unmittelbar nach der Laserbehandlung Schmerzen und eine Rötung; später eine entstellende Narbe.Die Gutachter der Gutachterkommission bei der Ärztekammer Nordrhein beurteilten die Behandlung als fehlerhaft.Laserbehandlungen zählen insgesamt zu den risikoreicheren Therapien in der Dermatologie. Häufiger als andere Behandlungsoptionen beurteilen die Begutachter die Behandlungen als fehlerhaft.
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Affiliation(s)
- L. Lehmann
- Schwerpunkt Allgemeinmedizin, Uniklinik Köln
- Helios Universitätsklinikum Wuppertal, Zentrum für Dermatologie, Allergologie und Dermatochirurgie, Universität Witten/Herdecke
- Fakultät für Gesundheit, Universität Witten/Herdecke
| | - S. Hofmann
- Helios Universitätsklinikum Wuppertal, Zentrum für Dermatologie, Allergologie und Dermatochirurgie, Universität Witten/Herdecke
- Fakultät für Gesundheit, Universität Witten/Herdecke
| | - T. Dirschka
- Privatpraxis Centroderm Wuppertal
- Fakultät für Gesundheit, Universität Witten/Herdecke
| | - P. Lehmann
- Helios Universitätsklinikum Wuppertal, Zentrum für Dermatologie, Allergologie und Dermatochirurgie, Universität Witten/Herdecke
- Fakultät für Gesundheit, Universität Witten/Herdecke
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Lehmann L, Hofmann S, Dirschka T, Lehmann P. Patientensicherheit: Die Lasertherapie gehört zu den risikoreicheren Therapieoptionen in der Dermatologie. Aktuelle Dermatologie 2021. [DOI: 10.1055/a-1419-6390] [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: 10/21/2022]
Abstract
ZusammenfassungSeit der Erstbeschreibung von Lasern und den ersten Anwendungen in der Dermatologie hat die Lasertherapie innerhalb des dermatologischen therapeutischen Armamentariums enorm an Bedeutung zugenommen.Da sie häufig bei ästhetischen Indikationen Anwendung findet, sind hohe Sicherheitsanforderungen zu gewährleisten, ansonsten kommt es zu unangenehmen juristischen Streitigkeiten. Eine retrospektive Analyse anhand der Fälle der Gutachterkammer für ärztliche Behandlungsfehler hat gezeigt, dass Lasertherapien zu den risikoreicheren therapeutischen Optionen in der Dermatologie gehören.
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Affiliation(s)
- L. Lehmann
- Schwerpunkt Allgemeinmedizin, Universitätsklinikum Köln
- Helios Universitätsklinikum Wuppertal, Zentrum für Dermatologie, Allergologie und Dermatochirurgie, Universität Witten/Herdecke
- Fakultät für Gesundheit, Universität Witten/Herdecke
| | - S. Hofmann
- Helios Universitätsklinikum Wuppertal, Zentrum für Dermatologie, Allergologie und Dermatochirurgie, Universität Witten/Herdecke
- Fakultät für Gesundheit, Universität Witten/Herdecke
| | - T. Dirschka
- Centroderm, Wuppertal
- Fakultät für Gesundheit, Universität Witten/Herdecke
| | - P. Lehmann
- Helios Universitätsklinikum Wuppertal, Zentrum für Dermatologie, Allergologie und Dermatochirurgie, Universität Witten/Herdecke
- Fakultät für Gesundheit, Universität Witten/Herdecke
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Abstract
PURPOSE OF REVIEW Novel therapies for damaged and diseased bone are being developed in a preclinical testing process consisting of in vitro cell experiments followed by in vivo animal studies. The in vitro results are often not representative of the results observed in vivo. This could be caused by the complexity of the natural bone environment that is missing in vitro. Ex vivo bone explant cultures provide a model in which cells are preserved in their native three-dimensional environment. Herein, it is aimed to review the current status of bone explant culture models in relation to their potential in complementing the preclinical evaluation process with specific attention paid to the incorporation of mechanical loading within ex vivo culture systems. RECENT FINDINGS Bone explant cultures are often performed with physiologically less relevant bone, immature bone, and explants derived from rodents, which complicates translatability into clinical practice. Mature bone explants encounter difficulties with maintaining viability, especially in static culture. The integration of mechanical stimuli was able to extend the lifespan of explants and to induce new bone formation. Bone explant cultures provide unique platforms for bone research and mechanical loading was demonstrated to be an important component in achieving osteogenesis ex vivo. However, more research is needed to establish a representative, reliable, and reproducible bone explant culture system that includes both components of bone remodeling, i.e., formation and resorption, in order to bridge the gap between in vitro and in vivo research in preclinical testing.
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Affiliation(s)
- E E A Cramer
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute of Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, the Netherlands
| | - K Ito
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute of Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, the Netherlands
| | - S Hofmann
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute of Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, the Netherlands.
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Masmoudi W, Vaillant M, Vassileva S, Patsatsi A, Quereux G, Moltrasio C, Abasq C, Prost-Squarcioni C, Kottler D, Kiritsi D, Litrowski N, Plantin P, Friedrichsen L, Zebrowska A, Duvert-Lehembre S, Hofmann S, Ferranti V, Jouen F, Joly P, Hebert V. International validation of the Bullous Pemphigoid Disease Area Index severity score and calculation of cut-off values for defining mild, moderate and severe types of bullous pemphigoid. Br J Dermatol 2020; 184:1106-1112. [PMID: 33067805 DOI: 10.1111/bjd.19611] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/15/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND The Bullous Pemphigoid Disease Area Index (BPDAI) score has been proposed to provide an objective measure of bullous pemphigoid (BP) activity. OBJECTIVES The objective of this study was to calculate BPDAI cut-off values defining mild, moderate and severe BP. We also aimed to assess the interrater reliability and correlation with the number of daily new blisters, and anti-BP180 and anti-BP230 antibodies. METHODS Severity scores were recorded by two blinded investigators. Anti-BP180 and anti-BP230 antibodies were measured using an enzyme-linked immunosorbent assay (ELISA). Cut-off values defining mild, moderate and severe subgroups were calculated based on the 25th and 75th percentiles of the BPDAI score. RESULTS In total, 285 patients with BP were enrolled from 50 dermatology departments in Europe. Median BPDAI activity was 37·5 points (range 0-164). Cut-off values corresponding to the first and third quartiles of the BPDAI score were 20 and 57, respectively; thus, these values were used to define mild (≤ 19), moderate (≥ 20 and ≤ 56) and severe (≥ 57) BP. The median BPDAI score for patients with ≤ 10 daily new blisters was 26 [interquartile range (IQR) 17-45], and for patients with > 10 daily new blisters the median score was 55 (IQR 39-82). The BPDAI intraclass correlation coefficient measured at baseline was 0·97 and remained higher than 0·90 up to month 6. The improvement in the BPDAI score was correlated with the absolute decrease in anti-BP180 ELISA value (Spearman's rank r = 0·34, P < 0·004), but not with anti-BP230 antibodies (r = 0·17, P = 0·15). CONCLUSIONS This study suggests cut-off values of 20-57 for BPDAI to distinguish mild, moderate and severe BP, and confirms that it is a robust tool to assess BP severity precisely.
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Affiliation(s)
- W Masmoudi
- Department of Dermatology, Centre de Référence des Maladies Bulleuses Autoimmunes
| | - M Vaillant
- Department of Immunology, INSERM U1234, Rouen University Hospital, Rouen, France
| | - S Vassileva
- Department of Dermatology, Medical University of Sofia, Sofia, Bulgaria
| | - A Patsatsi
- 2nd Department of Dermatology and Venerology, Papageorgiou General Hospital, Aristotle University School of Medicine, Thessaloniki, Greece
| | - G Quereux
- Department of Dermatology, Nantes University Hospital, Nantes, France
| | - C Moltrasio
- Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - C Abasq
- Department of Dermatology, Brest University Hospital, Brest, France
| | - C Prost-Squarcioni
- Department of Dermatology, Avicenne Hospital, University Paris 13, Bobigny, France
| | - D Kottler
- Department of Dermatology, Bichat Hospital, AP-HP, Paris, France
| | - D Kiritsi
- Department of Dermatology, Medical Center, University of Freiburg, Freiburg, Germany
| | - N Litrowski
- Department of Dermatology, Monod General Hospital, Le Havre, France
| | - P Plantin
- Department of Dermatology, Centre Hospitalier de Cornouaille, Quimper, France
| | - L Friedrichsen
- Department of Dermatology, University of Lubeck, Lubeck, Germany
| | - A Zebrowska
- Department of Dermatology and Venerology, Medical University of Lodz, Lodz, Poland
| | | | - S Hofmann
- Department of Dermatology, HELIOS University of Wuppertal, Wuppertal, Germany
| | - V Ferranti
- Department of Dermatology, Centre de Référence des Maladies Bulleuses Autoimmunes
| | - F Jouen
- Department of Dermatology, Centre de Référence des Maladies Bulleuses Autoimmunes.,Department of Immunology, INSERM U1234, Rouen University Hospital, Rouen, France
| | - P Joly
- Department of Dermatology, Centre de Référence des Maladies Bulleuses Autoimmunes.,Department of Immunology, INSERM U1234, Rouen University Hospital, Rouen, France
| | - V Hebert
- Department of Dermatology, Centre de Référence des Maladies Bulleuses Autoimmunes.,Department of Immunology, INSERM U1234, Rouen University Hospital, Rouen, France
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Remmers S, Mayer D, Melke J, Ito K, Hofmann S. Measuring mineralised tissue formation and resorption in a human 3D osteoblast-osteoclast co-culture model. Eur Cell Mater 2020; 40:189-202. [PMID: 33152099 DOI: 10.22203/ecm.v040a12] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
In vitro tissue engineered bone constructs have been developed, but models which mimic both formation and resorption in parallel are still lacking. To be used as a model for the bone remodeling process, the formation and resorption of mineralised tissue volume over time needs to be visualised, localised and quantified. The goal of this study was to develop a human 3D osteoblast-osteoclast co-culture in which 1) osteoblasts deposit mineralised matrix, 2) monocytes differentiate into resorbing osteoclasts, and 3) the formation and resorption of mineralised matrix could be quantified over time using micro-computed tomography (μCT). Mesenchymal stromal cells were seeded on silk fibroin scaffolds and differentiated towards osteoblasts to create mineralised constructs. Thereafter, monocytes were added and differentiated towards osteoclasts. The presence of osteoblasts and osteoclasts was confirmed using immunohistochemistry. Osteoclastic activity was confirmed by measuring the increased release of osteoclast marker tartrate resistant acid phosphatase (TRAP), suggesting that osteoclasts were actively resorbing mineralised tissue. Resorption pits were visualised using scanning electron microscopy. Mineralised matrix formation and resorption were quantified using μCT and subsequent scans were registered to visualise remodelling. Both formation and resorption occurred in parallel in the co-culture. The resorbed tissue volume exceeded the formed tissue volume after day 12. In conclusion, the current model was able to visualise, localise and quantify mineralised matrix formation and resorption. Such a model could be used to facilitate fundamental research on bone remodeling, facilitate drug testing and may have clinical implications in personalised medicine by allowing the use of patient cells.
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Affiliation(s)
| | | | | | | | - S Hofmann
- Orthopaedic Biomechanics, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the
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Joly P, Horvath B, Patsatsi Α, Uzun S, Bech R, Beissert S, Bergman R, Bernard P, Borradori L, Caproni M, Caux F, Cianchini G, Daneshpazhooh M, De D, Dmochowski M, Drenovska K, Ehrchen J, Feliciani C, Goebeler M, Groves R, Guenther C, Hofmann S, Ioannides D, Kowalewski C, Ludwig R, Lim Y, Marinovic B, Marzano A, Mascaró J, Mimouni D, Murrell D, Pincelli C, Squarcioni C, Sárdy M, Setterfield J, Sprecher E, Vassileva S, Wozniak K, Yayli S, Zambruno G, Zillikens D, Hertl M, Schmidt E. Updated S2K guidelines on the management of pemphigus vulgaris and foliaceus initiated by the european academy of dermatology and venereology (EADV). J Eur Acad Dermatol Venereol 2020; 34:1900-1913. [DOI: 10.1111/jdv.16752] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 05/29/2020] [Indexed: 01/21/2023]
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Perconte D, Seurre K, Humbert V, Ulysse C, Sander A, Trastoy J, Zatko V, Godel F, Kidambi PR, Hofmann S, Zhang XP, Bercioux D, Bergeret FS, Dlubak B, Seneor P, Villegas JE. Long-Range Propagation and Interference of d-Wave Superconducting Pairs in Graphene. Phys Rev Lett 2020; 125:087002. [PMID: 32909764 DOI: 10.1103/physrevlett.125.087002] [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] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 06/22/2020] [Accepted: 07/22/2020] [Indexed: 06/11/2023]
Abstract
Recent experiments have shown that proximity with high-temperature superconductors induces unconventional superconducting correlations in graphene. Here, we demonstrate that those correlations propagate hundreds of nanometers, allowing for the unique observation of d-wave Andreev-pair interferences in YBa_{2}Cu_{3}O_{7}-graphene devices that behave as a Fabry-Perot cavity. The interferences show as a series of pronounced conductance oscillations analogous to those originally predicted by de Gennes-Saint-James for conventional metal-superconductor junctions. The present demonstration is pivotal to the study of exotic directional effects expected for nodal superconductivity in Dirac materials.
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Affiliation(s)
- D Perconte
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
- Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - K Seurre
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - V Humbert
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - C Ulysse
- Centre for Nanoscience and Nanotechnology, CNRS, Université Paris-Sud/Université Paris-Saclay, Boulevard Thomas Gobert, 91120 Palaiseau, France
| | - A Sander
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - J Trastoy
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - V Zatko
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - F Godel
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - P R Kidambi
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, 2400 Highland Avenue, Nashville, Tennessee 37212, USA
- Department of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - S Hofmann
- Department of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - X P Zhang
- Centro de Fisica de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Basque Country, Spain
- Donostia International Physics Center (DIPC), Manuel de Lardizabal, 4, 20018 Donostia-San Sebastián, Spain
| | - D Bercioux
- Donostia International Physics Center (DIPC), Manuel de Lardizabal, 4, 20018 Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation of Science, 48011 Bilbao, Basque Country, Spain
| | - F S Bergeret
- Centro de Fisica de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Basque Country, Spain
- Donostia International Physics Center (DIPC), Manuel de Lardizabal, 4, 20018 Donostia-San Sebastián, Spain
| | - B Dlubak
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - P Seneor
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Javier E Villegas
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
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Casalis de Pury A, Zheng X, Ojambati OS, Trifonov A, Grosse C, Kleemann ME, Babenko V, Purdie D, Taniguchi T, Watanabe K, Lombardo A, Vandenbosch GAE, Hofmann S, Baumberg JJ. Localized Nanoresonator Mode in Plasmonic Microcavities. Phys Rev Lett 2020; 124:093901. [PMID: 32202875 DOI: 10.1103/physrevlett.124.093901] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 01/29/2020] [Accepted: 01/30/2020] [Indexed: 06/10/2023]
Abstract
Submicron-thick hexagonal boron nitride crystals embedded in noble metals form planar Fabry-Perot half-microcavities. Depositing Au nanoparticles on top of these microcavities forms previously unidentified angle- and polarization-sensitive nanoresonator modes that are tightly laterally confined by the nanoparticle. Comparing dark-field scattering with reflection spectroscopies shows plasmonic and Fabry-Perot-like enhancements magnify subtle interference contributions, which lead to unexpected redshifts in the dark-field spectra, explained by the presence of these new modes.
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Affiliation(s)
- A Casalis de Pury
- Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
- Cambridge Graphene Centre and Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | - X Zheng
- ESAT-TELEMIC, KU Leuven, B-300 Leuven, Belgium
| | - O S Ojambati
- Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
| | - A Trifonov
- Spin Optics Lab, Saint Petersburg State University, Saint Petersburg 198504, Russia
| | - C Grosse
- Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
| | - M-E Kleemann
- Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
| | - V Babenko
- Cambridge Graphene Centre and Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | - D Purdie
- Cambridge Graphene Centre and Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | - T Taniguchi
- National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-44, Japan
| | - K Watanabe
- National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-44, Japan
| | - A Lombardo
- Cambridge Graphene Centre and Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | | | - S Hofmann
- Cambridge Graphene Centre and Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
| | - J J Baumberg
- Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
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Bastos S, Hebert V, Vassileva S, Patsatsi A, Meijer J, Quéreux G, Bedane C, Prost-Squarcioni C, Debardieux S, Oro S, Chaby G, D’Incan M, Litrowski N, Boulard C, Lunardon L, Kiritsi D, Jedlickova H, Feliciani C, Roussel A, Kottler D, Plantin P, Richard MA, Friedrichsen L, Abasq C, Duvert Lehembre S, Gottlieb J, Zebrowska A, Hofmann S, Joly P. Efficacité et tolérance de la prednisone à 0,5 mg/kg/j en traitement initial de la pemphigoïde bulleuse. Ann Dermatol Venereol 2019. [DOI: 10.1016/j.annder.2019.09.038] [Citation(s) in RCA: 2] [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: 10/25/2022]
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25
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Hepp P, Hutter S, Hofmann S, Kuhn C, Jeschke U. Die Expression von Histone H3 Lysin 9 Acetylierungen ist in GDM Plazentas signifikant erniedrigt und kann nicht durch Calcitriol Gabe behoben werden. Geburtshilfe Frauenheilkd 2019. [DOI: 10.1055/s-0039-1693878] [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: 10/26/2022] Open
Affiliation(s)
- P Hepp
- Ludwig-Maximilians-Universität, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, München
| | - S Hutter
- Ludwig-Maximilians-Universität, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, München
| | - S Hofmann
- Ludwig-Maximilians-Universität, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, München
| | - C Kuhn
- Ludwig-Maximilians-Universität, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, München
| | - U Jeschke
- Ludwig-Maximilians-Universität, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, München
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Schudt F, Gross V, Sohrabi K, Fischer P, Hofmann S, Noeh C, Hildebrandt O, Koehler U. [The Nocturnal Respiratory Rate in COPD Patients of Varying GOLD Severity with/without Nicotine Consumption: Calculation by Means of Breath Sound Analysis]. Pneumologie 2019; 73:465-469. [PMID: 30895593 DOI: 10.1055/a-0859-4643] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Respiratory rate is an important risk marker and enables early detection of critically ill and vulnerable patients in clinical routine. The aim of this pilot study with 31 patients (COPD severity levels II - IV) was to determine the mean nocturnal respiratory rate based on breath sound recordings and to investigate the dependence of respiratory rate on COPD severity level and smoker status. The mean respiratory rate of the total collective was 19/min. For the COPD-GOLD severity levels, no significant differences in mean respiratory rate could be observed. When nicotine consumption is taken into account, active smokers showed a significantly higher mean respiratory rate of 20.84 ± 4.45/min compared to non-smokers with 17.41 ± 3.14/min (p < 0.05). In addition, active smokers in the study were significantly more frequent among patients with night-time wheezing (60 % vs. 23.8 %). This might suggest that smokers need to perform increased breathing work with increased breathing rate to compensate for oxygen deficiency in bronchial obstruction. The results of the present study show that with the acoustic recording of breath sounds, a reliable representation and calculation of the breath frequency is possible.
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Affiliation(s)
- F Schudt
- Fachbereich Gesundheit, Technische Hochschule Mittelhessen, Gießen
| | - V Gross
- Fachbereich Gesundheit, Technische Hochschule Mittelhessen, Gießen
| | - K Sohrabi
- Fachbereich Gesundheit, Technische Hochschule Mittelhessen, Gießen
| | - P Fischer
- Fachbereich Gesundheit, Technische Hochschule Mittelhessen, Gießen
| | - S Hofmann
- Fachbereich Gesundheit, Technische Hochschule Mittelhessen, Gießen
| | - C Noeh
- Fachbereich Gesundheit, Technische Hochschule Mittelhessen, Gießen
| | - O Hildebrandt
- Klinik für Innere Medizin, SP Pneumologie, Intensiv- und Schlafmedizin, Philipps-Universität, Marburg
| | - U Koehler
- Klinik für Innere Medizin, SP Pneumologie, Intensiv- und Schlafmedizin, Philipps-Universität, Marburg
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Litvinchuk SN, Melnikov DA, Borkin LJ, Hofmann S. Rediscovery of the High Altitude Lazy Toad, Scutiger occidentalis Dubois, 1978, in India. RUSS J HERPETOL 2019. [DOI: 10.30906/1026-2296-2019-26-1-17-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Velasco-Vélez JJ, Teschner D, Girgsdies F, Hävecker M, Streibel V, Willinger MG, Cao J, Lamoth M, Frei E, Wang R, Centeno A, Zurutuza A, Hofmann S, Schlögl R, Knop-Gericke A. Correction to: The Role of Adsorbed and Subsurface Carbon Species for the Selective Alkyne Hydrogenation Over a Pd-Black Catalyst: An Operando Study of Bulk and Surface. Top Catal 2018. [DOI: 10.1007/s11244-018-1090-3] [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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Tremmel E, Vattai A, Hofmann S, Kuhn C, Ditsch N, Harbeck N, Jeschke U, Mahner S. Primäre Mammakarzinom Patientinnen (cM0) mit erhöhter Expression der L-DOPA Decarboxylase (DDC) im Primärtumor weisen ein verlängertes Gesamtüberleben auf. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1671519] [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: 10/28/2022] Open
Affiliation(s)
- E Tremmel
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - A Vattai
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - S Hofmann
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - C Kuhn
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - N Ditsch
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - N Harbeck
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - U Jeschke
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - S Mahner
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
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Vattai A, Tremmel E, Hofmann S, Kuhn C, Harbeck N, Ditsch N, Jeschke U, Mahner S. Einfluss von Thyronaminen auf die TAAR1 Expression sowie die Proliferation und Migration der Mammakarzinom Zelllinien MCF-7 und T47D. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1671522] [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: 10/28/2022] Open
Affiliation(s)
- A Vattai
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - E Tremmel
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - S Hofmann
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - C Kuhn
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - N Harbeck
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - N Ditsch
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - U Jeschke
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
| | - S Mahner
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe und Brustzentrum der Ludwig-Maximilians Universität München, Campus Innenstadt und Campus Großhadern, München, Deutschland
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Melke J, Zhao F, van Rietbergen B, Ito K, Hofmann S. Localisation of mineralised tissue in a complex spinner flask environment correlates with predicted wall shear stress level localisation. Eur Cell Mater 2018; 36:57-68. [PMID: 30062678 DOI: 10.22203/ecm.v036a05] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Spinner flask bioreactors have often been employed for bone tissue engineering. However, the reasons for their success in facilitating bone growth remain inconclusive. It was hypothesised that engineered bone tissue formation can be attributed to mechanical stimuli, which can be predicted in the tissue engineered construct. To test the hypothesis and draw conclusions as to how mechanical stimulation affects cell behaviour, a multi- disciplinary approach using cell culture experiments and computational fluid dynamics (CFD) to simulate the complex flow within the spinner flask and scaffold was employed. Micro-computed tomography and histology showed that statically cultured human bone marrow derived stromal cells on silk fibroin scaffolds did not form extracellular matrix (ECM) or deposit minerals. However, constructs cultured at 60 rpm resulted in ECM formation and mineralisation, mainly at the bottom of the scaffold (bottom: 78 ± 7 %, middle: 17 ± 5 %, top: 5 ± 2 % of total mineralised volume). Culturing at 300 rpm led to a more homogeneously distributed ECM (bottom: 40 ± 14 %, middle: 33 ± 1 %, top: 27 ± 14 % of total mineralised volume). These observations were in agreement (Pearson correlation coefficient: 97 %) with the computational simulations that predicted maximal scaffold mineralisation, based on wall shear stress stimulation, in the bottom at 60 rpm and in the main body at 300 rpm. Such combinations of CFD modelling and experimentation could advance our knowledge of the mechanical stimuli that cells experience in vitro and link them to biological responses.
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Affiliation(s)
| | | | | | | | - S Hofmann
- Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, the
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Zhu J, Schönfeldt V, Trillsch F, Kuhn C, Rahmeh M, Hofmann S, Mahner S, Jeschke U. EP3 reguliert Proliferation und Migration in Endometriumskarzinomzellen in vitro. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1655523] [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: 10/28/2022] Open
Affiliation(s)
- J Zhu
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Munich, Germany
| | - V Schönfeldt
- Division of Gynecological Endocrinology and Reproductive Medicine, Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Munich, Germany
| | - F Trillsch
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Munich, Germany
| | - C Kuhn
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Munich, Germany
| | - M Rahmeh
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Munich, Germany
| | - S Hofmann
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Munich, Germany
| | - S Mahner
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Munich, Germany
| | - U Jeschke
- Department of Obstetrics and Gynecology, University Hospital, LMU Munich, Munich, Germany
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33
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Shao W, Hofmann S, Kuhn C, Harbeck N, Jeschke U, Sixou S. Untersuchungen zur Expression von PPARγ und Cox-1 in 8 Brustkrebszelllinien. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1655513] [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: 10/28/2022] Open
Affiliation(s)
- W Shao
- Brustzentrum der Universität München, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Campus Innenstadt, Klinikum der Ludwig-Maximilians-Universität, Maistraße 11, 80337 München, Germany
| | - S Hofmann
- Brustzentrum der Universität München, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Campus Innenstadt, Klinikum der Ludwig-Maximilians-Universität, Maistraße 11, 80337 München, Germany
| | - C Kuhn
- Brustzentrum der Universität München, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Campus Innenstadt, Klinikum der Ludwig-Maximilians-Universität, Maistraße 11, 80337 München, Germany
| | - N Harbeck
- Brustzentrum der Universität München, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Campus Innenstadt, Klinikum der Ludwig-Maximilians-Universität, Maistraße 11, 80337 München, Germany
| | - U Jeschke
- Brustzentrum der Universität München, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Campus Innenstadt, Klinikum der Ludwig-Maximilians-Universität, Maistraße 11, 80337 München, Germany
| | - S Sixou
- Brustzentrum der Universität München, Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Campus Innenstadt, Klinikum der Ludwig-Maximilians-Universität, Maistraße 11, 80337 München, Germany
- Université Paul Sabatier Toulouse III, Faculté des Sciences Pharmaceutiques, 31062 Toulouse cedex 09, France
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Hofmann S, Awad G, Asch S, Saha S, Bireta C, Niehaus A, Baraki H, Kutschka I, Friedrich M. The Influence of Dynamically Regulated, Intermittently Regulated Active Chest Drainage Units Compared to Conventional Vacuum-Driven Systems on the Early Postoperative Outcome after Cardiac Surgery. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0038-1628093] [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: 10/28/2022]
Affiliation(s)
- S. Hofmann
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
| | - G. Awad
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
| | - S. Asch
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
| | - S. Saha
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
| | - C. Bireta
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
| | - A. Niehaus
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
| | - H. Baraki
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
| | - I. Kutschka
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
| | - M. Friedrich
- Thoracic and Cardiovascular Surgery, Georg-August-University, Göttingen, Germany
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Cabrero-Vilatela A, Alexander-Webber JA, Sagade AA, Aria AI, Braeuninger-Weimer P, Martin MB, Weatherup RS, Hofmann S. Atomic layer deposited oxide films as protective interface layers for integrated graphene transfer. Nanotechnology 2017; 28:485201. [PMID: 29039352 DOI: 10.1088/1361-6528/aa940c] [Citation(s) in RCA: 8] [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] [Indexed: 05/12/2023]
Abstract
The transfer of chemical vapour deposited graphene from its parent growth catalyst has become a bottleneck for many of its emerging applications. The sacrificial polymer layers that are typically deposited onto graphene for mechanical support during transfer are challenging to remove completely and hence leave graphene and subsequent device interfaces contaminated. Here, we report on the use of atomic layer deposited (ALD) oxide films as protective interface and support layers during graphene transfer. The method avoids any direct contact of the graphene with polymers and through the use of thicker ALD layers (≥100 nm), polymers can be eliminated from the transfer-process altogether. The ALD film can be kept as a functional device layer, facilitating integrated device manufacturing. We demonstrate back-gated field effect devices based on single-layer graphene transferred with a protective Al2O3 film onto SiO2 that show significantly reduced charge trap and residual carrier densities. We critically discuss the advantages and challenges of processing graphene/ALD bilayer structures.
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Affiliation(s)
- A Cabrero-Vilatela
- Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, United Kingdom
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Tappertzhofen S, Hofmann S. Embedded nanoparticle dynamics and their influence on switching behaviour of resistive memory devices. Nanoscale 2017; 9:17494-17504. [PMID: 29109988 DOI: 10.1039/c7nr05847k] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Resistively switching Conductive Bridge Random Access Memories (CBRAMs) rely on the controlled formation and dissolution of metallic filaments within a solid insulator, and are emerging building blocks for beyond von Neumann computing architectures and neuromorphic computing. A lack of understanding of the underlying switching mechanisms currently prevents further device utilisation and optimisation. We present a study of lateral and vertical CBRAM model devices that allow us to systematically relate important switching properties and their statistics to a direct characterisation of their critical switching region by scanning and transmission electron microscopy, i.e. to the physical nature of metal filaments and inclusions on all relevant length scales. We find that filaments are composed of metallic clusters and show how filament dynamics link to migration effects of embedded nanoparticles under voltage bias stress. The formation of metal clusters is promoted by a dynamic interplay of cation mobility and redox rate during switching. These clusters are not completely removed from the switching material matrix upon RESET and appear to grow by consumption of smaller clusters. We discuss in detail the interfacial stress of the nanoparticles in the context of their interaction with the switching material and ambient atmosphere. This allows us to consistently interpret previous literature and to suggest future device improvements.
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Affiliation(s)
- S Tappertzhofen
- Department of Engineering, Electrical Engineering Division, University of Cambridge, CB3 0FA Cambridge, UK.
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37
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Kroeger J, Hofmann S, Leppert J, Has C, Franzke C. 098 Novel amino acid duplication in collagen XVII causes mild junctional epidermolysis bullosa by altering the coiled-coil structure and impairing collagen XVII trimerization and maturation. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.408] [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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Schröder L, Tilgener C, Hofmann S, Richter D, Jeschke U. Einfluss lipophiler Komponenten des Matcha-Teeextraktes auf das PPARγ abhängige Proliferationsverhalten in vitro. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602356] [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] Open
Affiliation(s)
- L Schröder
- Frauenklinik der LMU, Campus Innenstadt, München
| | - C Tilgener
- Frauenklinik der LMU, Campus Innenstadt, München
| | - S Hofmann
- Frauenklinik der LMU, Campus Innenstadt, München
| | - D Richter
- Frauenklinik der LMU, Campus Innenstadt, München
| | - U Jeschke
- Frauenklinik der LMU, Campus Innenstadt, München
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40
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Vattai A, Kuhn C, Hofmann S, Mahner S, Jeschke U, Ditsch N. Primäre Mammakarzinompatientinnen (M0) mit erhöhter Expression des Trace-amine associated receptors 1 (TAAR1) im Primärtumor weisen ein verlängertes Gesamtüberleben auf. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602360] [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] Open
Affiliation(s)
- A Vattai
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - C Kuhn
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - S Hofmann
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - S Mahner
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - U Jeschke
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - N Ditsch
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
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Stavrou S, Hofmann S, Kuhn C, Mahner S, Jeschke U, Vattai A. Hochregulation der GSK3ß- und TAAR1 Expression in Abortplazenten. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602278] [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] Open
Affiliation(s)
- S Stavrou
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - S Hofmann
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - C Kuhn
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - S Mahner
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - U Jeschke
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - A Vattai
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
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Gratz M, Hofmann S, Kuhn C, Mahner S, Jeschke U, Vattai A. Verminderte Expression der L-DOPA Decarboxylase im Abortgeschehen. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602266] [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] Open
Affiliation(s)
- M Gratz
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - S Hofmann
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - C Kuhn
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - S Mahner
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - U Jeschke
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
| | - A Vattai
- Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Klinikum der Universität München
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Kalson NS, Borthwick LA, Mann DA, Deehan DJ, Lewis P, Mann C, Mont MA, Morgan-Jones R, Oussedik S, Williams FMK, Toms A, Argenson JN, Bellemans J, Bhave A, Furnes O, Gollwitzer H, Haddad FS, Hofmann S, Krenn V. International consensus on the definition and classification of fibrosis of the knee joint. Bone Joint J 2017; 98-B:1479-1488. [PMID: 27803223 DOI: 10.1302/0301-620x.98b10.37957] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [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: 01/30/2016] [Accepted: 06/07/2016] [Indexed: 12/12/2022]
Abstract
AIMS The aim of this consensus was to develop a definition of post-operative fibrosis of the knee. PATIENTS AND METHODS An international panel of experts took part in a formal consensus process composed of a discussion phase and three Delphi rounds. RESULTS Post-operative fibrosis of the knee was defined as a limited range of movement (ROM) in flexion and/or extension, that is not attributable to an osseous or prosthetic block to movement from malaligned, malpositioned or incorrectly sized components, metal hardware, ligament reconstruction, infection (septic arthritis), pain, chronic regional pain syndrome (CRPS) or other specific causes, but due to soft-tissue fibrosis that was not present pre-operatively. Limitation of movement was graded as mild, moderate or severe according to the range of flexion (90° to 100°, 70° to 89°, < 70°) or extension deficit (5° to 10°, 11° to 20°, > 20°). Recommended investigations to support the diagnosis and a strategy for its management were also agreed. CONCLUSION The development of standardised, accepted criteria for the diagnosis, classification and grading of the severity of post-operative fibrosis of the knee will facilitate the identification of patients for inclusion in clinical trials, the development of clinical guidelines, and eventually help to inform the management of this difficult condition. Cite this article: Bone Joint J 2016;98-B:1479-88.
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Affiliation(s)
| | - L A Borthwick
- Newcastle University, Newcastle upon Tyne NE2 4HH, UK
| | - D A Mann
- Newcastle University, Newcastle upon Tyne NE2 4HH, UK
| | - D J Deehan
- Freeman Hospital, Newcastle Hospitals NHS Trust, High Heaton, Newcastle upon Tyne, NE7 7DN, UK
| | - P Lewis
- South Australian Health and Medical Institute, Adelaide, South Australia, Australia
| | - C Mann
- Norfolk and Norwich University NHS Trust, Norwich, UK
| | - M A Mont
- Cleveland Clinic , Cleveland, Ohio, USA
| | | | - S Oussedik
- Institute of Sport, Exercise and Health, University College London Hospitals, 235 Euston Road, London NW1 2BU, UK
| | - F M K Williams
- King's College London, St Thomas' Hospital, London SE1 7EH, UK
| | - A Toms
- Royal Devon and Exeter Hospital, Exeter, UK
| | - J N Argenson
- Sainte-Marguerite Hospital, Aix-Marseille University, Marseille, France
| | | | - A Bhave
- Sinai Hospital, Baltimore, Maryland, USA
| | - O Furnes
- University of Bergen, Bergen, Norway
| | - H Gollwitzer
- Klinik für Orthopädie und Sportorthopädie, Klinikum rechts der Isar der Technischen Universität, Ismaninger Str. 22, 81675 Munich, Germany
| | - F S Haddad
- University College London Hospitals, 235 Euston Road, London NW1 2BU, UK
| | - S Hofmann
- LKH Stolzalpe Hospital & Teaching Hospital University Clinic Graz, Austria
| | - V Krenn
- MVZ-Zentrum für Histologie, Zytologie und Molekulare Diagnostik, Trier, Germany
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van Gestel NAP, Hulsen DJW, Geurts J, Hofmann S, Ito K, Arts JJ, van Rietbergen B. Composition dependent mechanical behaviour of S53P4 bioactive glass putty for bone defect grafting. J Mech Behav Biomed Mater 2017; 69:301-306. [PMID: 28131065 DOI: 10.1016/j.jmbbm.2017.01.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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: 11/21/2016] [Revised: 01/10/2017] [Accepted: 01/13/2017] [Indexed: 11/24/2022]
Abstract
To improve the handling properties of S53P4 bioactive glass granules for clinical applications, bioactive glass putty formulations were developed. These formulations contain both granules and a synthetic binder to form an injectable material that is easy to shape. To explore its applicability in load-bearing bone defect grafting, the relation between the putty composition and its mechanical behaviour was assessed in this study. Five putty formulations with variations in synthetic binder and granule content were mechanically tested in confined compression. The results showed that the impaction strains significantly decreased and the residual strains significantly increased with an increasing binder content. The stiffness of all tested formulations was found to be in the same range as the reported stiffness of cancellous bone. The measured creep strains were low and no significant differences between formulations were observed. The stiffness significantly increased when the samples were subjected to a second loading stage. The residual strains calculated from this second loading stage were also significantly different from the first loading stage, showing an increasing difference with an increasing binder content. Since residual strains are detrimental for graft layer stability in load-bearing defects, putty compositions with a low binder content would be most beneficial for confined, load-bearing bone defect grafting.
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Affiliation(s)
- N A P van Gestel
- Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands.
| | - D J W Hulsen
- Department of Orthopaedic Surgery, Research School CAPHRI, Maastricht University Medical Centre, PO Box 5800, 6229 HX Maastricht, The Netherlands; MICT Department, Jeroen Bosch Ziekenhuis, PO Box 90153, 5200 ME 's-Hertogenbosch, The Netherlands
| | - J Geurts
- Department of Orthopaedic Surgery, Research School CAPHRI, Maastricht University Medical Centre, PO Box 5800, 6229 HX Maastricht, The Netherlands
| | - S Hofmann
- Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Institute for Biomechanics, Swiss Federal Institute of Technology Zürich (ETHZ), Leopold-Ruzicka-Weg 4, 8093 Zürich, Switzerland
| | - K Ito
- Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Department of Orthopaedics, University Medical Centre Utrecht, PO Box 85500, 3508 GA Utrecht, The Netherlands
| | - J J Arts
- Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Department of Orthopaedic Surgery, Research School CAPHRI, Maastricht University Medical Centre, PO Box 5800, 6229 HX Maastricht, The Netherlands
| | - B van Rietbergen
- Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Department of Orthopaedic Surgery, Research School CAPHRI, Maastricht University Medical Centre, PO Box 5800, 6229 HX Maastricht, The Netherlands.
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Vattai A, Hofmann S, Kuhn C, Mahner S, Jeschke U. Hochregulation der Trace amine-associated receptor 1 (TAAR1) Expression in Synzytiotrophoblasten von Abortplazenten. Geburtshilfe Frauenheilkd 2016. [DOI: 10.1055/s-0036-1593291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Zhang X, Hofmann S, Rack B, Harbeck N, Jeschke U, Doisneau-Sixou S. Vitamin D receptor status of circulating tumor cells (CTC) in metastatic breast cancer patients. Geburtshilfe Frauenheilkd 2016. [DOI: 10.1055/s-0036-1592738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Knabl J, Hutter S, Hüttenbrenner R, Welbergen L, Hofmann S, Kuhn C, Jeschke U. Zelltypspezifische Veränderungen der Expression der Thyroid Hormon Rezeptoren in der Plazenta durch Gestationsdiabetes. Geburtshilfe Frauenheilkd 2016. [DOI: 10.1055/s-0036-1592943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Affiliation(s)
- S. Hofmann
- Max Planck Institute for Intelligent Systems (formerly MPI for Metals Research); Heisenbergstrasse 3 D-70569 Stuttgart Germany
| | - Y. Liu
- Department of Physics; Shantou University; 243 Daxue Road Shantou 515063 Guangdong China
| | - W. Jian
- Department of Physics; Shantou University; 243 Daxue Road Shantou 515063 Guangdong China
| | - H.L. Kang
- Department of Physics; Shantou University; 243 Daxue Road Shantou 515063 Guangdong China
| | - J.Y. Wang
- Department of Physics; Shantou University; 243 Daxue Road Shantou 515063 Guangdong China
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Hulsart-Billström G, Dawson JI, Hofmann S, Müller R, Stoddart MJ, Alini M, Redl H, El Haj A, Brown R, Salih V, Hilborn J, Larsson S, Oreffo RO, Oreffo ROC. A surprisingly poor correlation between in vitro and in vivo testing of biomaterials for bone regeneration: results of a multicentre analysis. Eur Cell Mater 2016; 31:312-22. [PMID: 27215739 DOI: 10.22203/ecm.v031a20] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
New regenerative materials and approaches need to be assessed through reliable and comparable methods for rapid translation to the clinic. There is a considerable need for proven in vitro assays that are able to reduce the burden on animal testing, by allowing assessment of biomaterial utility predictive of the results currently obtained through in vivo studies. The purpose of this multicentre review was to investigate the correlation between existing in vitro results with in vivo outcomes observed for a range of biomaterials. Members from the European consortium BioDesign, comprising 8 universities in a European multicentre study, provided data from 36 in vivo studies and 47 in vitro assays testing 93 different biomaterials. The outcomes of the in vitro and in vivo experiments were scored according to commonly recognised measures of success relevant to each experiment. The correlation of in vitro with in vivo scores for each assay alone and in combination was assessed. A surprisingly poor correlation between in vitro and in vivo assessments of biomaterials was revealed indicating a clear need for further development of relevant in vitro assays. There was no significant overall correlation between in vitro and in vivo outcome. The mean in vitro scores revealed a trend of covariance to in vivo score with 58 %. The inadequacies of the current in vitro assessments highlighted here further stress the need for the development of novel approaches to in vitro biomaterial testing and validated pre-clinical pipelines.
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Affiliation(s)
- G Hulsart-Billström
- Bone and Joint Research Group, Centre for Human Development, Stem Cells and Regeneration, Human Development and Health, Institute of Developmental Sciences, University of Southampton, Southampton, SO16 6YD,
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Velasco-Vélez JJ, Pfeifer V, Hävecker M, Wang R, Centeno A, Zurutuza A, Algara-Siller G, Stotz E, Skorupska K, Teschner D, Kube P, Braeuninger-Weimer P, Hofmann S, Schlögl R, Knop-Gericke A. Atmospheric pressure X-ray photoelectron spectroscopy apparatus: Bridging the pressure gap. Rev Sci Instrum 2016; 87:053121. [PMID: 27250406 DOI: 10.1063/1.4951724] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
One of the main goals in catalysis is the characterization of solid/gas interfaces in a reaction environment. The electronic structure and chemical composition of surfaces become heavily influenced by the surrounding environment. However, the lack of surface sensitive techniques that are able to monitor these modifications under high pressure conditions hinders the understanding of such processes. This limitation is known throughout the community as the "pressure gap." We have developed a novel experimental setup that provides chemical information on a molecular level under atmospheric pressure and in presence of reactive gases and at elevated temperatures. This approach is based on separating the vacuum environment from the high-pressure environment by a silicon nitride grid-that contains an array of micrometer-sized holes-coated with a bilayer of graphene. Using this configuration, we have investigated the local electronic structure of catalysts by means of photoelectron spectroscopy and in presence of gases at 1 atm. The reaction products were monitored online by mass spectrometry and gas chromatography. The successful operation of this setup was demonstrated with three different examples: the oxidation/reduction reaction of iridium (noble metal) and copper (transition metal) nanoparticles and with the hydrogenation of propyne on Pd black catalyst (powder).
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Affiliation(s)
- J J Velasco-Vélez
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr 45470, Germany
| | - V Pfeifer
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin 14195, Germany
| | - M Hävecker
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr 45470, Germany
| | - R Wang
- Engineering Department, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - A Centeno
- Graphenea, San Sebastian 20018, Spain
| | | | - G Algara-Siller
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin 14195, Germany
| | - E Stotz
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin 14195, Germany
| | - K Skorupska
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr 45470, Germany
| | - D Teschner
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin 14195, Germany
| | - P Kube
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin 14195, Germany
| | - P Braeuninger-Weimer
- Engineering Department, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - S Hofmann
- Engineering Department, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - R Schlögl
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr 45470, Germany
| | - A Knop-Gericke
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin 14195, Germany
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