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Liu N, Bartling S, Springer A, Kubis C, Bokareva OS, Salaya E, Sun J, Zhang Z, Wohlrab S, Abdel-Mageed AM, Liang HQ, Francke R. Heterogenized Molecular Electrocatalyst Based on a Hydroxo-Bridged Binuclear Copper(II) Phenanthroline Compound for Selective Reduction of CO 2 to Ethylene. Adv Mater 2024; 36:e2309526. [PMID: 37983740 DOI: 10.1002/adma.202309526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 11/07/2023] [Indexed: 11/22/2023]
Abstract
Molecular copper catalysts have emerged as promising candidates for the electrochemical reduction of CO2 . Notable features of such systems include the ability of Cu to generate C2+ products and the well-defined active sites that allow for targeted structural tuning. However, the frequently observed in situ formation of Cu nanoclusters has undermined the advantages of the molecular frameworks. It is therefore desirable to develop Cu-based catalysts that retain their molecular structures during electrolysis. In this context, a heterogenized binuclear hydroxo-bridged phenanthroline Cu(II) compound with a short Cu···Cu distance is reported as a simple yet efficient catalyst for electrogeneration of ethylene and other C2 products. In an aqueous electrolyte, the catalyst demonstrates remarkable performance, with excellent Faradaic efficiency for C2 products (62%) and minimal H2 evolution (8%). Furthermore, it exhibits high stability, manifested by no observable degradation during 15 h of continuous electrolysis. The preservation of the atomic distribution of the active sites throughout electrolysis is substantiated through comprehensive characterizations, including X-ray photoelectron and absorption spectroscopy, scanning and transmission electron microscopy, UV-vis spectroscopy, as well as control experiments. These findings establish a solid foundation for further investigations into targeted structural tuning, opening new avenues for enhancing the catalytic performance of Cu-based molecular electrocatalysts.
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Affiliation(s)
- Na Liu
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
| | - Stephan Bartling
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
| | - Armin Springer
- Electron Microscopy Center, University Medicine Rostock, Strempelstr. 14, 18057, Rostock, Germany
| | - Christoph Kubis
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
| | - Olga S Bokareva
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132, Kassel, Germany
| | - Evaristo Salaya
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
| | - Jiameng Sun
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jingshi Rd. 17923, Jinan, 250061, P. R. China
| | - Zhonghua Zhang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jingshi Rd. 17923, Jinan, 250061, P. R. China
| | - Sebastian Wohlrab
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
| | - Ali M Abdel-Mageed
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
| | - Hong-Qing Liang
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
- Department of Polymer Science and Engineering, Zhejiang University, Yuhangtang Rd. 866, Hangzhou, 310058, P. R. China
| | - Robert Francke
- Leibniz Institute for Catalysis, Albert-Einstein-Str. 29a, 18059, Rostock, Germany
- Institute of Chemistry, Rostock University, Albert-Einstein-Str. 3a, 18059, Rostock, Germany
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Springer A, Dreher A, Reimers J, Kaiser L, Bahlmann E, van der Schalk H, Wohlmuth P, Gessler N, Hassan K, Wietz J, Bein B, Spangenberg T, Willems S, Hakmi S, Tigges E. Gender disparities in patients undergoing extracorporeal cardiopulmonary resuscitation. Front Cardiovasc Med 2024; 10:1265978. [PMID: 38292453 PMCID: PMC10824923 DOI: 10.3389/fcvm.2023.1265978] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 11/30/2023] [Indexed: 02/01/2024] Open
Abstract
Introduction The use of venoarterial extracorporeal membrane oxygenation (VA-ECMO) in extracorporeal cardiopulmonary resuscitation (eCPR) has emerged as a treatment option for selected patients who are experiencing refractory cardiac arrest (CA). In the light of increasing availability, the analyses of outcome-relevant predisposing characteristics are of growing importance. We evaluated the prognostic influence of gender in patients presenting with out-of-hospital cardiac arrest (OHCA) treated with eCPR. Methods We retrospectively analysed the data of 377 consecutive patients treated for OHCA using eCPR in our cardiac arrest centre from January 2016 to December 2022. The primary outcome was defined as the survival of patients until they were discharged from the hospital, with a favourable neurological outcome [cerebral performance category (CPC) score of ≤2]. Statistical analyses were performed using baseline comparison, survival analysis, and multivariable analyses. Results Out of the 377 patients included in the study, 69 (21%) were female. Female patients showed a lower prevalence rate of pre-existing coronary artery disease (48% vs. 75%, p < 0.001) and cardiomyopathy (17% vs. 34%, p = 0.01) compared with the male patients, while the mean age and prevalence rate of other cardiovascular risk factors were balanced. The primary reason for CA differed significantly (female: coronary event 45%, pulmonary embolism 23%, cardiogenic shock 17%; male: coronary event 70%, primary arrhythmia 10%, cardiogenic shock 10%; p = 0.001). The prevalence rate of witnessed collapse (97% vs. 86%; p = 0.016) and performance of bystander CPR (94% vs. 85%; p = 0.065) was higher in female patients. The mean time from collapse to the initiation of eCPR did not differ between the two groups (77 ± 39 min vs. 80 ± 37 min; p = 0.61). Overall, female patients showed a higher percentage of neurologically favourable survival (23% vs. 12%; p = 0.027) despite a higher prevalence of procedure-associated bleeding complications (33% vs. 16%, p = 0.002). The multivariable analysis identified a shorter total CPR duration (p = 0.001) and performance of bystander CPR (p = 0.03) to be associated with superior neurological outcomes. The bivariate analysis showed relevant interactions between gender and body mass index (BMI). Conclusion Our analysis suggests a significant survival benefit for female patients who obtain eCPR, possibly driven by a higher prevalence of witnessed collapse and bystander CPR. Interestingly, the impact of patient age and BMI on neurologically favourable outcome was higher in female patients than in male patients, warranting further investigation.
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Affiliation(s)
- A. Springer
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - A. Dreher
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - J. Reimers
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - L. Kaiser
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - E. Bahlmann
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - H. van der Schalk
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | | | - N. Gessler
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
- Asklepios ProResearch, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Luebeck, Hamburg, Germany
| | - K. Hassan
- Department of Cardiac Surgery, Asklepios Clinic St. Georg, Hamburg, Germany
| | - J. Wietz
- Department of Emergency Medicine, Asklepios Clinic St. Georg, Hamburg, Germany
| | - B. Bein
- Department of Anaesthesiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - T. Spangenberg
- Department of Cardiology and Critical Care, Asklepios Clinic Altona, Hamburg, Germany
| | - S. Willems
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Luebeck, Hamburg, Germany
- Semmelweis-University, Budapest, Hungary
| | - S. Hakmi
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Luebeck, Hamburg, Germany
- Department of Cardiac Surgery, Asklepios Clinic St. Georg, Hamburg, Germany
| | - E. Tigges
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Luebeck, Hamburg, Germany
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Springer A, Dreher A, Reimers J, Kaiser L, Bahlmann E, van der Schalk H, Wohlmuth P, Gessler N, Hassan K, Wietz J, Bein B, Spangenberg T, Willems S, Hakmi S, Tigges E. Prognostic influence of mechanical cardiopulmonary resuscitation on survival in patients with out-of-hospital cardiac arrest undergoing ECPR on VA-ECMO. Front Cardiovasc Med 2024; 10:1266189. [PMID: 38274309 PMCID: PMC10808304 DOI: 10.3389/fcvm.2023.1266189] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 12/18/2023] [Indexed: 01/27/2024] Open
Abstract
Introduction The use of venoarterial extracorporeal membrane oxygenation (VA-ECMO) in extracorporeal cardiopulmonary resuscitation (ECPR) in selected patients after out-of-hospital cardiac arrest (OHCA) is an established method if return of spontaneous circulation cannot be achieved. Automated chest compression devices (ACCD) facilitate transportation of patients under ongoing CPR and might improve outcome. We thus sought to evaluate prognostic influence of mechanical CPR using ACCD in patients presenting with OHCA treated with ECPR including VA-ECMO. Methods We retrospectively analyzed data of 171 consecutive patients treated for OHCA using ECPR in our cardiac arrest center from the years 2016 to 2022. A Cox proportional hazards model was used to identify characteristics related with survival. Results Of the 171 analyzed patients (84% male, mean age 56 years), 12% survived the initial hospitalization with favorable neurological outcome. The primary reason for OHCA was an acute coronary event (72%) followed by primary arrhythmia (9%) and non-ischemic cardiogenic shock (6.7%). In most cases, the collapse was witnessed (83%) and bystander CPR was performed (83%). The median time from collapse to VA-ECMO was 81 min (Q1: 69 min, Q3: 98 min). No survival benefit was seen for patients resuscitated using ACCD. Patients in whom an ACCD was used presented with overall longer times from collapse to ECMO than those who were resuscitated manually [83 min (Q1: 70 min, Q3: 98 min) vs. 69 min (Q1: 57 min, Q3: 84 min), p = 0.004]. Conclusion No overall survival benefit of the use of ACCD before ECPR is established was found, possibly due to longer overall CPR duration. This may arguably be because of the limited availability of ACCD in pre-clinical paramedic service at the time of observation. Increasing the availability of these devices might thus improve treatment of OHCA, presumably by providing efficient CPR during transportation and transfer.
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Affiliation(s)
- A. Springer
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - A. Dreher
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - J. Reimers
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - L. Kaiser
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - E. Bahlmann
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - H. van der Schalk
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | | | - N. Gessler
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
- Asklepios ProResearch, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Luebeck, Hamburg, Germany
| | - K. Hassan
- Department of Cardiac Surgery, Asklepios Clinic St. Georg, Hamburg, Germany
| | - J. Wietz
- Department of Emergency Medicine, Asklepios Clinic St. Georg, Hamburg, Germany
| | - B. Bein
- Department of Anaesthesiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
| | - T. Spangenberg
- Department of Cardiology and Critical Care, Asklepios Clinic Altona, Hamburg, Germany
| | - S. Willems
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Luebeck, Hamburg, Germany
- Semmelweis-University, Budapest, Hungary
| | - S. Hakmi
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Luebeck, Hamburg, Germany
- Department of Cardiac Surgery, Asklepios Clinic St. Georg, Hamburg, Germany
| | - E. Tigges
- Department of Cardiology and Critical Care, Asklepios Clinic St. Georg, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Luebeck, Hamburg, Germany
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Kubiak A, Pajewska-Szmyt M, Kotula M, Leśniewski B, Voronkina A, Rahimi P, Falahi S, Heimler K, Rogoll A, Vogt C, Ereskovsky A, Simon P, Langer E, Springer A, Förste M, Charitos A, Joseph Y, Jesionowski T, Ehrlich H. Spongin as a Unique 3D Template for the Development of Functional Iron-Based Composites Using Biomimetic Approach In Vitro. Mar Drugs 2023; 21:460. [PMID: 37755073 PMCID: PMC10532518 DOI: 10.3390/md21090460] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/20/2023] [Accepted: 08/21/2023] [Indexed: 09/28/2023] Open
Abstract
Marine sponges of the subclass Keratosa originated on our planet about 900 million years ago and represent evolutionarily ancient and hierarchically structured biological materials. One of them, proteinaceous spongin, is responsible for the formation of 3D structured fibrous skeletons and remains enigmatic with complex chemistry. The objective of this study was to investigate the interaction of spongin with iron ions in a marine environment due to biocorrosion, leading to the occurrence of lepidocrocite. For this purpose, a biomimetic approach for the development of a new lepidocrocite-containing 3D spongin scaffold under laboratory conditions at 24 °C using artificial seawater and iron is described for the first time. This method helps to obtain a new composite as "Iron-Spongin", which was characterized by infrared spectroscopy and thermogravimetry. Furthermore, sophisticated techniques such as X-ray fluorescence, microscope technique, and X-Ray diffraction were used to determine the structure. This research proposed a corresponding mechanism of lepidocrocite formation, which may be connected with the spongin amino acids functional groups. Moreover, the potential application of the biocomposite as an electrochemical dopamine sensor is proposed. The conducted research not only shows the mechanism or sensor properties of "Iron-spongin" but also opens the door to other applications of these multifunctional materials.
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Affiliation(s)
- Anita Kubiak
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland; (M.K.); (B.L.)
- Center of Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61-614 Poznan, Poland;
| | - Martyna Pajewska-Szmyt
- Center of Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61-614 Poznan, Poland;
| | - Martyna Kotula
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland; (M.K.); (B.L.)
- Center of Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61-614 Poznan, Poland;
| | - Bartosz Leśniewski
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland; (M.K.); (B.L.)
- Center of Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61-614 Poznan, Poland;
| | - Alona Voronkina
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599 Freiberg, Germany; (A.V.); (P.R.); (S.F.); (Y.J.)
- Department of Pharmacy, National Pirogov Memorial Medical University, Vinnytsya, Pyrogov Street. 56, 21018 Vinnytsia, Ukraine
| | - Parvaneh Rahimi
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599 Freiberg, Germany; (A.V.); (P.R.); (S.F.); (Y.J.)
| | - Sedigheh Falahi
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599 Freiberg, Germany; (A.V.); (P.R.); (S.F.); (Y.J.)
| | - Korbinian Heimler
- Institute of Analytical Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09599 Freiberg, Germany; (K.H.); (A.R.); (C.V.)
| | - Anika Rogoll
- Institute of Analytical Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09599 Freiberg, Germany; (K.H.); (A.R.); (C.V.)
| | - Carla Vogt
- Institute of Analytical Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09599 Freiberg, Germany; (K.H.); (A.R.); (C.V.)
| | - Alexander Ereskovsky
- IMBE, CNRS, IRD, Aix Marseille University, Station Marine d’Endoume, Rue de la Batterie des Lions, 13007 Marseille, France;
| | - Paul Simon
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany;
| | - Enrico Langer
- Institute of Semiconductors and Microsystems, TU Dresden, Nöthnitzer Str. 64, 01187 Dresden, Germany;
| | - Armin Springer
- Department Life, Light & Matter, University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany;
- Medical Biology and Electron Microscopy Centre, Rostock University Medical Center, Strempelstr. 14, 18057 Rostock, Germany
| | - Maik Förste
- Institute for Nonferrous Metallurgy and Purest Materials (INEMET), TU Bergakademie Freiberg, Leipziger Str. 34, D-09599 Freiberg, Germany; (M.F.); (A.C.)
| | - Alexandros Charitos
- Institute for Nonferrous Metallurgy and Purest Materials (INEMET), TU Bergakademie Freiberg, Leipziger Str. 34, D-09599 Freiberg, Germany; (M.F.); (A.C.)
| | - Yvonne Joseph
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599 Freiberg, Germany; (A.V.); (P.R.); (S.F.); (Y.J.)
| | - Teofil Jesionowski
- Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland;
| | - Hermann Ehrlich
- Center of Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61-614 Poznan, Poland;
- Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland;
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Polley C, Distler T, Scheufler C, Detsch R, Lund H, Springer A, Schneidereit D, Friedrich O, Boccaccini AR, Seitz H. 3D printing of piezoelectric and bioactive barium titanate-bioactive glass scaffolds for bone tissue engineering. Mater Today Bio 2023; 21:100719. [PMID: 37529217 PMCID: PMC10387613 DOI: 10.1016/j.mtbio.2023.100719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 06/26/2023] [Accepted: 06/29/2023] [Indexed: 08/03/2023] Open
Abstract
Bone healing is a complex process orchestrated by various factors, such as mechanical, chemical and electrical cues. Creating synthetic biomaterials that combine several of these factors leading to tailored and controlled tissue regeneration, is the goal of scientists worldwide. Among those factors is piezoelectricity which creates a physiological electrical microenvironment that plays an important role in stimulating bone cells and fostering bone regeneration. However, only a limited number of studies have addressed the potential of combining piezoelectric biomaterials with state-of-the-art fabrication methods to fabricate tailored scaffolds for bone tissue engineering. Here, we present an approach that takes advantage of modern additive manufacturing techniques to create macroporous biomaterial scaffolds based on a piezoelectric and bioactive ceramic-crystallised glass composite. Using binder jetting, scaffolds made of barium titanate and 45S5 bioactive glass are fabricated and extensively characterised with respect to their physical and functional properties. The 3D-printed ceramic-crystallised glass composite scaffolds show both suitable mechanical strength and bioactive behaviour, as represented by the accumulation of bone-like calcium phosphate on the surface. Piezoelectric scaffolds that mimic or even surpass bone with piezoelectric constants ranging from 1 to 21 pC/N are achieved, depending on the composition of the composite. Using MC3T3-E1 osteoblast precursor cells, the scaffolds show high cytocompatibility coupled with cell attachment and proliferation, rendering the barium titanate/45S5 ceramic-crystallised glass composites promising candidates for bone tissue engineering.
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Affiliation(s)
| | - Thomas Distler
- Institute of Biomaterials, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | | | - Rainer Detsch
- Institute of Biomaterials, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Henrik Lund
- Leibniz Institute for Catalysis, Rostock, Germany
| | - Armin Springer
- Electron Microscopy Centrum, University Hospital Rostock, Germany
- Department Life, Light & Matter, University of Rostock, Rostock, Germany
| | - Dominik Schneidereit
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Aldo R. Boccaccini
- Institute of Biomaterials, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Hermann Seitz
- Chair of Microfluidics, University of Rostock, Rostock, Germany
- Department Life, Light & Matter, University of Rostock, Rostock, Germany
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Wolff A, Frank M, Staehlke S, Springer A, Hahn O, Meyer J, Peters K. 3D Spheroid Cultivation Alters the Extent and Progression of Osteogenic Differentiation of Mesenchymal Stem/Stromal Cells Compared to 2D Cultivation. Biomedicines 2023; 11:biomedicines11041049. [PMID: 37189667 DOI: 10.3390/biomedicines11041049] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 03/08/2023] [Accepted: 03/17/2023] [Indexed: 03/31/2023] Open
Abstract
Mesenchymal stem/stromal cells (MSC) are capable of progenitor cell fraction renewal or tissue-specific differentiation. These properties are maintained during in vitro cultivation, making them an interesting model system for testing biological and pharmacological compounds. Cell cultivation in 2D is commonly used to study cellular responses, but the 2D environment does not reflect the structural situation of most cell types. Therefore, 3D culture systems have been developed to provide a more accurate physiological environment in terms of cell–cell interactions. Since knowledge about the effects of 3D culture on specific differentiation processes is limited, we studied the effects on osteogenic differentiation and the release of factors affecting bone metabolism for up to 35 days and compared them with the effects in 2D culture. We demonstrated that the selected 3D model allowed the rapid and reliable formation of spheroids that were stable over several weeks and both accelerated and enhanced osteogenic differentiation compared with the 2D culture. Thus, our experiments provide new insights into the effects of cell arrangement of MSC in 2D and 3D. However, due to the different culture dimensions, various detection methods had to be chosen, which in principle limits the explanatory power of the comparison between 2D and 3D cultures.
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Ghasemian K, Broer I, Schön J, Killisch R, Kolp N, Springer A, Huckauf J. Oral and Subcutaneous Immunization with a Plant-Produced Mouse-Specific Zona Pellucida 3 Peptide Presented on Hepatitis B Core Antigen Virus-like Particles. Vaccines (Basel) 2023; 11:vaccines11020462. [PMID: 36851339 PMCID: PMC9963689 DOI: 10.3390/vaccines11020462] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/14/2023] [Accepted: 02/16/2023] [Indexed: 02/19/2023] Open
Abstract
A short mouse-specific peptide from zona pellucida 3 (mZP3, amino acids 328-342) has been shown to be associated with antibody-mediated contraception. In this study, we investigated the production of mZP3 in the plant, as an orally applicable host, and examined the immunogenicity of this small peptide in the BALB/c mouse model. The mZP3 peptide was inserted into the major immunodominant region of the hepatitis B core antigen and was produced in Nicotiana benthamiana plants via Agrobacterium-mediated transient expression. Soluble HBcAg-mZP3 accumulated at levels up to 2.63 mg/g leaf dry weight (LDW) containing ~172 µg/mg LDW mZP3 peptide. Sucrose gradient analysis and electron microscopy indicated the assembly of the HBcAg-mZP3 virus-like particles (VLPs) in the soluble protein fraction. Subcutaneously administered mZP3 peptide displayed on HBcAg VLPs was immunogenic in BALB/c mice at a relatively low dosage (5.5 µg mZP3 per dose) and led to the generation of mZP3-specific antibodies that bound to the native zona pellucida of wild mice. Oral delivery of dried leaves expressing HBcAg-mZP3 also elicited mZP3-specific serum IgG and mucosal IgA that cross-reacted with the zona pellucida of wild mice. According to these results, it is worthwhile to investigate the efficiency of plants producing HBcAg-mZP3 VLPs as immunogenic edible baits in reducing the fertility of wild mice through inducing antibodies that cross-react to the zona pellucida.
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Affiliation(s)
- Khadijeh Ghasemian
- Department of Agrobiotechnology and Risk Assessment for Bio and Gene Technology, Faculty of Agricultural and Environmental Sciences, University of Rostock, 18059 Rostock, Germany
| | - Inge Broer
- Department of Agrobiotechnology and Risk Assessment for Bio and Gene Technology, Faculty of Agricultural and Environmental Sciences, University of Rostock, 18059 Rostock, Germany
| | - Jennifer Schön
- Department of Reproduction Biology, Leibniz Institute for Zoo and Wildlife Research (IZW), 10315 Berlin, Germany
| | - Richard Killisch
- BIOSERV, Analytik und Medizinprodukte GmbH, 18059 Rostock, Germany
| | - Nadine Kolp
- BIOSERV, Analytik und Medizinprodukte GmbH, 18059 Rostock, Germany
| | - Armin Springer
- Medical Biology and Electron Microscopy Center, Rostock University Medical Center, 18057 Rostock, Germany
| | - Jana Huckauf
- Department of Agrobiotechnology and Risk Assessment for Bio and Gene Technology, Faculty of Agricultural and Environmental Sciences, University of Rostock, 18059 Rostock, Germany
- Correspondence:
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Ziswiler T, Luciani M, Vanetta C, Springer A, Diteepeng T, Von Eckardstein A, Mueller D, Barbagallo M, Conen D, Rodondi N, Moschovitis G, Osswald S, Kuehne M, Bonati LH, Beer JH. Trimethylamine N-oxide is associated with impaired cognitive function in patients with atrial fibrillation. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2435] [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: 11/13/2022] Open
Abstract
Abstract
Introduction
Since patients with atrial fibrillation (AF) are predisposed to suffer from major adverse cerebrovascular events (MACE), they are more likely to suffer MACE linked sequelae, such as cognitive impairment. We hypothesised that the gut microbiome derivate trimethylamine N-oxide (TMAO) may amplify this pathomechanism given its hypercoagulative, proinflammatory and proatherogenic effects.
Methods
Patients of the Swiss-AF cohort with determined TMAO plasma levels, cognitive scores (n=2'379) and cerebral magnetic resonance imaging (cMRI) (n=1'722) collected at baseline were included. TMAO levels were measured by liquid chromatography-mass spectrometry (HPLC). Overall cognitive performance was evaluated using the Cognitive Construct (CoCo) score reflecting different cognitive functions measured by four validated neuropsychological assessments, namely the Montreal Cognitive Assessment (MoCA), Trail Making Test (TMT parts A and B), Semantic Fluency Test (SFT) and Digital Symbol Substitution Test (DSST). The scores were compared with the quartiles of patients' TMAO plasma levels (Q1: 0.6–4, Q2: 4–5.8, Q3: 5.8–9.1, Q4: 9.1–164μmol/l) in linear effect models. All models were adjusted for multiple covariates correlating with this association: For TMAO (overall meat consumption >3 times per week, physical activity, glomerular filtration rate, presence of diabetes mellitus), cognitive function (EQ-5D-5L score, geriatric depression scale, education level) and cerebral affects (white matter lesions volume and total brain volume in cMRI). The relevance of high TMAO plasma levels in different stroke groups in cMRI (i.e., clinically overt, silent, or no stroke) were analysed in a subgroup analysis. The subgroups were additionally adjusted for total brain volume to eliminate the effect of simultaneous decrease of cerebral white matter.
Results
After multivariable adjustment, AF patients in the highest quartile of TMAO levels performed significantly poorer in the global cognitive score (CoCo: estimate −0.11, 95% CI [−0.17, −0.05], p=0.002) compared to patients in the lowest quartile. This was observed also in the MoCA, SFT, DSST, TMT-A and TMT-B.
In the subgroup analysis, an association between the highest TMAO quartile (compared with the lowest quartile) and lower CoCo score was found in the group of patients with overt strokes (−0.18, 95% CI [−0.33, −0.04], p=0.012). Weak evidence of the same association was found in the group of patients with silent strokes (−0.13, 95% CI [−0.25, 0.002], p=0.053) and patients with no strokes (−0.08, 95% CI [−0.16, 0.01], p=0.07).
After adjustment for decreased brain volume, the association remained for silent strokes (−0.14, 95% CI [−0.28, −0.01], p=0.036) indicating the impact of TMAO in this subgroup.
Conclusion
TMAO plasma levels were associated with cognitive impairment in patients with AF. Longitudinal data will clarify dynamics and likely causality between TMAO and cognitive impairment.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): Swiss National Science Foundation
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Affiliation(s)
- T Ziswiler
- Cantonal Hospital of Baden, Department of General Internal Medicine , Baden , Switzerland
| | - M Luciani
- Cantonal Hospital of Baden, Department of General Internal Medicine , Baden , Switzerland
| | - C Vanetta
- Swiss Federal Institute of Technology Zurich (ETH Zurich), Seminar for Statistics , Zurich , Switzerland
| | - A Springer
- University Hospital Basel, Cardiovascular Research Institute Basel and Cardiology Division , Basel , Switzerland
| | - T Diteepeng
- University of Zurich, Center for Molecular Cardiology , Schlieren , Switzerland
| | - A Von Eckardstein
- University Hospital Zurich, Institute of Clinical Chemistry , Zurich , Switzerland
| | - D Mueller
- University Hospital Zurich, Institute of Clinical Chemistry , Zurich , Switzerland
| | - M Barbagallo
- University Hospital Zurich, Department of Neurology , Zurich , Switzerland
| | - D Conen
- McMaster University, Population Health Research Institute , Hamilton , Canada
| | - N Rodondi
- University of Bern, Department of General Internal Medicine and Institute of Primary Health Care (BIHAM) , Bern , Switzerland
| | - G Moschovitis
- EOC Cantonal Hospital, Division of Cardiology , Lugano , Switzerland
| | - S Osswald
- University Hospital Basel, Cardiovascular Research Institute Basel and Cardiology Division , Basel , Switzerland
| | - M Kuehne
- University Hospital Basel, Cardiovascular Research Institute Basel and Cardiology Division , Basel , Switzerland
| | - L H Bonati
- University Hospital Basel, Department of Neurology and Stroke Center , Basel , Switzerland
| | - J H Beer
- Cantonal Hospital of Baden, Department of General Internal Medicine , Baden , Switzerland
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Kram W, Rebl H, de la Cruz JE, Haag A, Renner J, Epting T, Springer A, Soria F, Wienecke M, Hakenberg OW. Interactive Effects of Copper-Doped Urological Implants with Tissue in the Urinary Tract for the Inhibition of Cell Adhesion and Encrustation in the Animal Model Rat. Polymers (Basel) 2022; 14:polym14163324. [PMID: 36015581 PMCID: PMC9412396 DOI: 10.3390/polym14163324] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/25/2022] [Accepted: 07/28/2022] [Indexed: 11/20/2022] Open
Abstract
The insertion of a ureteral stent provides acute care by restoring urine flow and alleviating urinary retention or dysfunction. The problems of encrustation, bacterial colonization and biofilm formation become increasingly important when ureteral stents are left in place for a longer period of time. One way to reduce encrustation and bacterial adherence is to modify the stent surface with a diamond-like carbon coating, in combination with copper doping. The biocompatibilities of the Elastollan® base material and the a-C:H/Cu-mulitilayer coating were tested in synthetic urine. The copper content in bladder tissue was determined by atomic absorption spectroscopy and in blood and in urine by inductively coupled plasma mass spectrometry. Encrustations on the materials were analyzed by scanning electron microscopy, energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. A therapeutic window for copper ions of 0.5–1.0 mM was determined to kill bacteria without affecting human urothelial cells. In the rat animal model, it was found that copper release did not reach toxic concentrations in the affecting tissue of the urinary tract or in the blood. The encrustation behavior of the surfaces showed that the roughness of the amorphous carbon layer with the copper doping is probably the causal factor for the higher encrustation.
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Affiliation(s)
- Wolfgang Kram
- Department of Urology, Rostock University Medical Center, Schillingallee 35, 18057 Rostock, Germany
- Correspondence:
| | - Henrike Rebl
- Department of Cell Biology, Rostock University Medical Center, Schillingallee 69, 18057 Rostock, Germany
| | - Julia E. de la Cruz
- Jesús Usón Minimally Invasive Surgery Centre, Carretera N-521, Km. 41.8, 10071 Cáceres, Spain
| | - Antonia Haag
- Department of Urology, Rostock University Medical Center, Schillingallee 35, 18057 Rostock, Germany
| | - Jürgen Renner
- Institute for Polymer- and Production Technologies e. V., Alter Holzhafen 19, 23966 Wismar, Germany
| | - Thomas Epting
- Institute for Clinical Chemistry and Laboratory Medicine, Medical Center, Faculty of Medicine, University of Freiburg, Hugstetterstraße 55, 79106 Freiburg, Germany
| | - Armin Springer
- Electron Microscopy Center, Rostock University Medical Center, Strempelstraße 14, 18057 Rostock, Germany
| | - Federico Soria
- Jesús Usón Minimally Invasive Surgery Centre, Carretera N-521, Km. 41.8, 10071 Cáceres, Spain
| | | | - Oliver W. Hakenberg
- Department of Urology, Rostock University Medical Center, Schillingallee 35, 18057 Rostock, Germany
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10
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Weller J, Vasudevan P, Kreikemeyer B, Ekat K, Jackszis M, Springer A, Chatzivasileiou K, Lang H. The role of bacterial corrosion on recolonization of titanium implant surfaces: An in vitro study. Clin Implant Dent Relat Res 2022; 24:664-675. [PMID: 35709098 DOI: 10.1111/cid.13114] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 05/27/2022] [Accepted: 05/28/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Inflammation triggered by bacterial biofilms in the surrounding tissue is a major etiological factor for peri-implantitis and subsequent implant failure. However, little is known about the direct effects of bacterial corrosion and recolonization on implant failure PURPOSE: To investigate the influence of oral commensals on bacterial corrosion and recolonization of titanium surfaces. MATERIALS AND METHODS Streptococcus sanguinis (S. sanguinis) and Porphyromonas gingivalis (P. gingivalis), which are key bacteria in oral biofilm formation, were cultured on commercially pure titanium and titanium-aluminum-vanadium (Ti6Al4V) plates in artificial saliva/brain heart infusion medium under aerobic or anaerobic conditions. Biofilm formation was examined after 7 and 21 days by crystal violet and live/dead staining. Titanium ions released into culture supernatants were analyzed over a period of 21 days by atomic absorption spectrometry. Visual changes in surface morphology were investigated using scanning electron microscopy. Biofilm formation on sterilized, biocorroded, and recolonized implant surfaces was determined by crystal violet staining. RESULTS S. sanguinis and P. gingivalis formed stable biofilms on the titanium samples. Bacterial corrosion led to a significant increase in titanium ion release from these titanium plates (p < 0.01), which was significantly higher under aerobic conditions on pure titanium (p ≤ 0.001). No obvious morphological surface changes, such as pitting and discoloration, were detected in the titanium samples. During early biofilm formation, the addition of titanium ions significantly decreased the number of live cells. In contrast, a significant effect on biofilm mass was only detected with P. gingivalis. Bacterial corrosion had no influence on bacterial recolonization following sterilization of titanium and Ti6Al4V surfaces. CONCLUSION Bacterial corrosion differs between oral commensal bacteria and leads to increased titanium ion release from titanium plates. The titanium ion release did not influence biofilm formation or bacterial recolonization under in vitro conditions.
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Affiliation(s)
- Julia Weller
- Department of Operative Dentistry and Periodontology, University Medical Center Rostock, Rostock, Germany
| | - Praveen Vasudevan
- Department of Operative Dentistry and Periodontology, University Medical Center Rostock, Rostock, Germany
| | - Bernd Kreikemeyer
- Institute of Medical Microbiology, Virology and Hygiene, University Medical Center Rostock, Rostock, Germany
| | - Katharina Ekat
- Institute of Medical Microbiology, Virology and Hygiene, University Medical Center Rostock, Rostock, Germany
| | - Mario Jackszis
- Biomechanics and Implant Technology Research Laboratory, Department of Orthopaedics, University Medical Center Rostock, Rostock, Germany
| | - Armin Springer
- Medical Biology and Electron Microscopy Centre, Medical Faculty, University of Rostock, Rostock, Germany
| | - Kyriaki Chatzivasileiou
- Department of Operative Dentistry and Periodontology, University Medical Center Rostock, Rostock, Germany
| | - Hermann Lang
- Department of Operative Dentistry and Periodontology, University Medical Center Rostock, Rostock, Germany
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Abstract
INTRODUCTION Anthelmintic resistance (AR) of ruminant gastrointestinal nematodes (GINs) constitutes a major problem worldwide. Among GINs, the abomasal blood-feeding parasite Haemonchus contortus is particularly pathogenic and may show resistance against all major anthelmintic substance classes. In the present study, the death of a 1,5 year-old European bison (Bison bonasus) from a German wildlife park due to haemonchosis despite frequent anthelmintic treatment of the herd with fenbendazole as well as doramectin prompted an investigation regarding AR. Pooled faecal samples were collected from four different bison groups as well as from mouflons (Ovis orientalis), elk (Alces alces), reindeer (Rangifer tarandus), sika deer (Cervus nippon), Persian fallow deer (Dama mesopotamica) and red deer (Cervus elaphus) housed by the wildlife park. After coproscopical examination, faecal larval cultures were established. Haemonchus contortus-positive larval cultures were further examined for genetic polymorphisms associated with benzimidazole resistance at codons 167 and 200 of the β-tubulin isotype 1 gene by real-time pyrosequencing. Infections with H. contortus were detected in all four bison groups, as well as in mouflons. In five samples, representing two bison groups and the mouflons, the frequency of the resistance-associated single-nucleotide polymorphism (SNP) at codon 200 was 100%. In contrast, resistance-associated SNPs were not detected at codon 167. In addition, faecal egg counts from two bison before and 14 days after parenteral doramectin treatment indicated possible macrocyclic lactone resistance. Detection of anthelmintic resistant nematodes in these animals was especially concerning in the light of planned reintroduction into the wild. As helminth control in zoological gardens and wildlife parks relies mostly on anthelmintic treatment due to restricted possibilities regarding management practices such as rotational grazing, care should be taken to avoid underdosing or unnecessary frequent treatments facilitating the development of AR.
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Affiliation(s)
- A Springer
- Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Germany
| | - P Kloene
- Tierärztliche Gemeinschaftspraxis im Deister-Sünteltal, Germany
| | - C Strube
- Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Germany
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Knoll S, Springer A, Hauck D, Schunack B, Pachnicke S, Fingerle V, Strube C. Distribution of Borrelia burgdorferi s.l. and Borrelia miyamotoi in Ixodes tick populations in Northern Germany, co-infections with Rickettsiales and assessment of potential influencing factors. Med Vet Entomol 2021; 35:595-606. [PMID: 34180074 DOI: 10.1111/mve.12537] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 04/30/2021] [Accepted: 06/03/2021] [Indexed: 06/13/2023]
Abstract
To determine Borrelia spp. (Spirochaetales: Spirochaetaceae) prevalence and species distribution in Northern Germany, Ixodes ticks were sampled from April to October in 2018 and 2019 by the flagging method at three locations each in five regions. Analysis by quantitative real-time PCR of 3150 individual ticks revealed an overall prevalence of 30.6%, without significant differences between tick stages (31.7% positive adults, 28.6% positive nymphs). Significant differences were observed in seasonal infection rates, but not between regions, landscape types or sampling years. Analysis of co-infections with Rickettsiales indicated a negative association between Borrelia and Anaplasma phagocytophilum infection. The most frequent Borrelia species differentiated by Reverse Line Blot were B. afzelii and B. garinii/B. bavariensis, followed by B. valaisiana, B. burgdorferi sensu stricto, B. spielmanii and B. lusitaniae. Furthermore, B. miyamotoi was identified in 12.9% of differentiable samples. No effect of region nor landscape type on species composition was found, but significant variations in the distribution at the different sampling sites within a region were observed. The detected monthly fluctuations in prevalence and the differences in intra-regional Borrelia species distribution underline the importance of long-term and multi-location monitoring of Borrelia spp. in ticks as an essential part of public health assessment.
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Affiliation(s)
- S Knoll
- Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Hanover, Germany
| | - A Springer
- Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Hanover, Germany
| | - D Hauck
- Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Hanover, Germany
| | - B Schunack
- Bayer Animal Health GmbH (part of Elanco Animal Health), Leverkusen, Germany
| | - S Pachnicke
- Bayer Vital GmbH, Leverkusen, Germany
- Elanco Deutschland GmbH, Monheim, Germany
| | - V Fingerle
- National Reference Centre for Borrelia, Oberschleißheim, Germany
| | - C Strube
- Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Hanover, Germany
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13
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Sloot R, Nsonwu O, Chudasama D, Rooney G, Pearson C, Choi H, Mason E, Springer A, Gerver S, Brown C, Hope R. Rising rates of hospital-onset Klebsiella spp. and Pseudomonas aeruginosa bacteraemia in NHS acute trusts in England: a review of national surveillance data, August 2020-February 2021. J Hosp Infect 2021; 119:175-181. [PMID: 34547320 DOI: 10.1016/j.jhin.2021.08.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 08/23/2021] [Accepted: 08/24/2021] [Indexed: 11/15/2022]
Abstract
Increases in hospital-onset Klebsiella spp. and Pseudomonas aeruginosa bacteraemia rates in England were observed between August 2020 and February 2021 to the highest levels recorded since the start of mandatory surveillance in April 2017. Cases were extracted from England's mandatory surveillance database for key Gram-negative bloodstream infections. Incidence rates for hospital-onset bacteraemia cases increased from 8.9 (N=255) to 14.9 (N=394) per 100,000 bed-days for Klebsiella spp. [incidence rate ratio (IRR) 1.7, P<0.001], and from 4.9 (N=139) to 6.2 (N=164) per 100,000 bed-days for P. aeruginosa (IRR 1.3, P<0.001) (August 2020-February 2021). These incidence rates were higher than the average rates observed during the same period in the previous 3 years. These trends coincided with an increase in the percentage of hospital-onset bacteraemia cases that were also positive for severe acute respiratory syndrome coronavirus-2.
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Affiliation(s)
- R Sloot
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK.
| | - O Nsonwu
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - D Chudasama
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - G Rooney
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - C Pearson
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - H Choi
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - E Mason
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - A Springer
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - S Gerver
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - C Brown
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
| | - R Hope
- Department of Healthcare-Associated Infections and Antimicrobial Resistance, National Infection Service, Public Health England, Colindale, London, UK
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14
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Xu T, Lu P, Wohlrab S, Chen W, Springer A, Wu XF, Lu W. In situ grown palladium nanoparticles on polyester fabric as easy-separable and recyclable catalyst for Suzuki-Miyaura reaction. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2021.106328] [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: 12/13/2022] Open
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15
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Waletzko-Hellwig J, Pohl C, Riese J, Schlosser M, Dau M, Engel N, Springer A, Bader R. Effect of High Hydrostatic Pressure on Human Trabecular Bone Regarding Cell Death and Matrix Integrity. Front Bioeng Biotechnol 2021; 9:730266. [PMID: 34458245 PMCID: PMC8387795 DOI: 10.3389/fbioe.2021.730266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 08/02/2021] [Indexed: 11/13/2022] Open
Abstract
The reconstruction of critical size bone defects is still clinically challenging. Even though the transplantation of autologous bone is used as gold standard, this therapy is accompanied by donor site morbidities as well as tissue limitations. The alternatively used allografts, which are devitalized due to thermal, chemical or physical processing, often lose their matrix integrity and have diminished biomechanical properties. High Hydrostatic Pressure (HHP) may represent a gentle alternative to already existing methods since HHP treated human osteoblasts undergo cell death and HHP treated bone cylinders maintain their mechanical properties. The aim of this study was to determine the biological effects caused by HHP treatment regarding protein/matrix integrity and type of cell death in trabecular bone cylinders. Therefore, different pressure protocols (250 and 300 MPa for 10, 20 and 30 min) and end point analysis such as quantification of DNA-fragmentation, gene expression, SDS-PAGE, FESEM analysis and histological staining were performed. While both protein and matrix integrity was preserved, molecular biological methods showed an apoptotic differentiation of cell death for lower pressures and shorter applications (250 MPa for 10 and 20 min) and necrotic differentiation for higher pressures and longer applications (300 MPa for 30 min). This study serves as a basis for further investigation as it shows that HHP successfully devitalizes trabecular bone cylinders.
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Affiliation(s)
- Janine Waletzko-Hellwig
- Department of Oral, Maxillofacial and Plastic Surgery, Rostock University Medical Center, Rostock, Germany
| | - Christopher Pohl
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Janik Riese
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Michael Schlosser
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Michael Dau
- Department of Oral, Maxillofacial and Plastic Surgery, Rostock University Medical Center, Rostock, Germany
| | - Nadja Engel
- Department of Oral, Maxillofacial and Plastic Surgery, Rostock University Medical Center, Rostock, Germany
| | - Armin Springer
- Medical Biology and Electron Microscopy Center, Rostock University Medical Center, Rostock, Germany
| | - Rainer Bader
- Biomechanics and Implant Technology Research Laboratory, Department of Orthopedics, Rostock University Medical Center, Rostock, Germany
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16
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Tsurkan D, Simon P, Schimpf C, Motylenko M, Rafaja D, Roth F, Inosov DS, Makarova AA, Stepniak I, Petrenko I, Springer A, Langer E, Kulbakov AA, Avdeev M, Stefankiewicz AR, Heimler K, Kononchuk O, Hippmann S, Kaiser D, Viehweger C, Rogoll A, Voronkina A, Kovalchuk V, Bazhenov VV, Galli R, Rahimi-Nasrabadi M, Molodtsov SL, Rahimi P, Falahi S, Joseph Y, Vogt C, Vyalikh DV, Bertau M, Ehrlich H. Extreme Biomimetics: Designing of the First Nanostructured 3D Spongin-Atacamite Composite and its Application. Adv Mater 2021; 33:e2101682. [PMID: 34085323 DOI: 10.1002/adma.202101682] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/27/2021] [Indexed: 06/12/2023]
Abstract
The design of new composite materials using extreme biomimetics is of crucial importance for bioinspired materials science. Further progress in research and application of these new materials is impossible without understanding the mechanisms of formation, as well as structural features at the molecular and nano-level. It presents a challenge to obtain a holistic understanding of the mechanisms underlying the interaction of organic and inorganic phases under conditions of harsh chemical reactions for biopolymers. Yet, an understanding of these mechanisms can lead to the development of unusual-but functional-hybrid materials. In this work, a key way of designing centimeter-scale macroporous 3D composites, using renewable marine biopolymer spongin and a model industrial solution that simulates the highly toxic copper-containing waste generated in the production of printed circuit boards worldwide, is proposed. A new spongin-atacamite composite material is developed and its structure is confirmed using neutron diffraction, X-ray diffraction, high-resolution transmission electron microscopy/selected-area electron diffraction, X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, and electron paramagnetic resonance spectroscopy. The formation mechanism for this material is also proposed. This study provides experimental evidence suggesting multifunctional applicability of the designed composite in the development of 3D constructed sensors, catalysts, and antibacterial filter systems.
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Affiliation(s)
- Dmitry Tsurkan
- Institut of Electronic- und Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599, Freiberg, Germany
| | - Paul Simon
- Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187, Dresden, Germany
| | - Christian Schimpf
- Institute of Materials Science, TU Bergakademie Freiberg, 09599, Freiberg, Germany
| | - Mykhaylo Motylenko
- Institute of Materials Science, TU Bergakademie Freiberg, 09599, Freiberg, Germany
| | - David Rafaja
- Institute of Materials Science, TU Bergakademie Freiberg, 09599, Freiberg, Germany
| | - Friedrich Roth
- Institute of Experimental Physics, TU Bergakademie Freiberg, 09599, Freiberg, Germany
| | - Dmytro S Inosov
- Institute of Solid State and Materials Physics, TU Dresden, D-01069, Dresden, Germany
- Dresden-Würzburg Cluster of Excellence on Complexity and Topology in Quantum Matter (ct.qmat), TU Dresden, D-01062, Dresden, Germany
| | - Anna A Makarova
- Institute of Chemistry and Biochemistry, Free University of Berlin, D-14195, Berlin, Germany
| | - Izabela Stepniak
- Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, ul. Berdychowo 4, Poznan, 60-965, Poland
| | - Iaroslav Petrenko
- Institut of Electronic- und Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599, Freiberg, Germany
| | - Armin Springer
- Medizinische Biologie und Elektronenmikroskopisches Zentrum (EMZ), Strempelstraße 14, 18057, Rostock, Germany
- Universitätsmedizin Rostock, Strempelstraße 14, 18057, Rostock, Germany
| | - Enrico Langer
- Institute of Semiconductors and Microsystems, TU Dresden, 01062, Dresden, Germany
| | - Anton A Kulbakov
- Institute of Solid State and Materials Physics, TU Dresden, D-01069, Dresden, Germany
- Dresden-Würzburg Cluster of Excellence on Complexity and Topology in Quantum Matter (ct.qmat), TU Dresden, D-01062, Dresden, Germany
| | - Maxim Avdeev
- Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW, 2234, Australia
| | - Artur R Stefankiewicz
- Center for Advanced Technologies, Adam Mickiewicz University, Poznań, Poland
- Faculty of Chemistry, Adam Mickiewicz University, Poznań, Poland
| | - Korbinian Heimler
- Institute of Analytical Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany
| | - Olga Kononchuk
- Institute of Chemical Technology, TU Bergakademie Freiberg, Leipziger Straße 29, 09599, Freiberg, Germany
| | - Sebastian Hippmann
- Institute of Chemical Technology, TU Bergakademie Freiberg, Leipziger Straße 29, 09599, Freiberg, Germany
| | - Doreen Kaiser
- Institute of Chemical Technology, TU Bergakademie Freiberg, Leipziger Straße 29, 09599, Freiberg, Germany
| | - Christine Viehweger
- Institute of Analytical Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany
| | - Anika Rogoll
- Institute of Analytical Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany
| | - Alona Voronkina
- Department of Pharmacy, National Pirogov Memorial Medical University, Vinnytsia, 21018, Ukraine
| | - Valentine Kovalchuk
- Department of Pharmacy, National Pirogov Memorial Medical University, Vinnytsia, 21018, Ukraine
- Department of Microbiology, National Pirogov Memorial Medical University, Vinnytsia, 21018, Ukraine
| | | | - Roberta Galli
- Department of Medical Physics and Biomedical Engineering, Clinical Sensoring and Monitoring - Anesthesiology and Intensive Care Medicine, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Fetscherstraße 74, 01307, Dresden, Germany
| | - Mehdi Rahimi-Nasrabadi
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, 1951683759, Iran
- Faculty of Pharmacy, Baqiyatallah University of Medical Sciences, Tehran, 1951683759, Iran
- Saint-Petersburg National Research University of Information Technologies, Mechanics and Optics, ITMO University, St. Petersburg, 197101, Russia
| | - Serguei L Molodtsov
- Institute of Experimental Physics, TU Bergakademie Freiberg, 09599, Freiberg, Germany
- European XFEL GmbH, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Parvaneh Rahimi
- Institut of Electronic- und Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599, Freiberg, Germany
| | - Sedigheh Falahi
- Institut of Electronic- und Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599, Freiberg, Germany
| | - Yvonne Joseph
- Institut of Electronic- und Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599, Freiberg, Germany
| | - Carla Vogt
- Institute of Analytical Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09599, Freiberg, Germany
| | - Denis V Vyalikh
- Donostia International Physics Center (DIPC), Donostia-San Sebastián, 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, 48011, Spain
| | - Martin Bertau
- Institute of Chemical Technology, TU Bergakademie Freiberg, Leipziger Straße 29, 09599, Freiberg, Germany
| | - Hermann Ehrlich
- Institut of Electronic- und Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 3, 09599, Freiberg, Germany
- Center for Advanced Technologies, Adam Mickiewicz University, Poznań, Poland
- Centre for Climate Change Research, Toronto, ON, M4P 1J4, Canada
- A.R. Environmental Solutions, ICUBE-University of Toronto Mississauga, Mississauga, ON, L5L 1C6, Canada
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Peng Q, Yang B, Milkereit B, Liu D, Springer A, Rettenmayr M, Schick C, Keßler O. Nucleation Behavior of a Single Al-20Si Particle Rapidly Solidified in a Fast Scanning Calorimeter. Materials (Basel) 2021; 14:2920. [PMID: 34071567 PMCID: PMC8199230 DOI: 10.3390/ma14112920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 05/25/2021] [Accepted: 05/27/2021] [Indexed: 11/16/2022]
Abstract
Understanding the rapid solidification behavior characteristics, nucleation undercooling, and nucleation mechanism is important for modifying the microstructures and properties of metal alloys. In order to investigate the rapid solidification behavior in-situ, accurate measurements of nucleation undercooling and cooling rate are required in most rapid solidification processes, e.g., in additive manufacturing (AM). In this study, differential fast scanning calorimetry (DFSC) was applied to investigate the nucleation kinetics in a single micro-sized Al-20Si (mass%) particle under a controlled cooling rate of 5000 K/s. The nucleation rates of primary Si and secondary α-Al phases were calculated by a statistical analysis of 300 identical melting/solidification experiments. Applying a model based on the classical nucleation theory (CNT) together with available thermodynamic data, two different heterogeneous nucleation mechanisms of primary Si and secondary α-Al were proposed, i.e., surface heterogeneous nucleation for primary Si and interface heterogenous nucleation for secondary α-Al. The present study introduces a practical method for a detailed investigation of rapid solidification behavior of metal particles to distinguish surface and interface nucleation.
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Affiliation(s)
- Qin Peng
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany; (Q.P.); (B.M.); (O.K.)
| | - Bin Yang
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany; (Q.P.); (B.M.); (O.K.)
- Competence Centre °CALOR, Department Life, Light & Matter, University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany;
| | - Benjamin Milkereit
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany; (Q.P.); (B.M.); (O.K.)
- Competence Centre °CALOR, Department Life, Light & Matter, University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany;
| | - Dongmei Liu
- Otto Schott Institute of Materials Research, Friedrich-Schiller-University Jena, Löbdergraben 32, 07743 Jena, Germany; (D.L.); (M.R.)
| | - Armin Springer
- Medical Biology and Electron Microscopy Centre, University Medicine Rostock, Strempelstr. 14, 18057 Rostock, Germany;
| | - Markus Rettenmayr
- Otto Schott Institute of Materials Research, Friedrich-Schiller-University Jena, Löbdergraben 32, 07743 Jena, Germany; (D.L.); (M.R.)
| | - Christoph Schick
- Competence Centre °CALOR, Department Life, Light & Matter, University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany;
- Institute of Physics, University of Rostock, Albert-Einstein-Str. 23–24, 18059 Rostock, Germany
- Butlerov Institute of Chemistry, Kazan Federal University, 18 Kremlyovskaya Street, 420008 Kazan, Russia
| | - Olaf Keßler
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany; (Q.P.); (B.M.); (O.K.)
- Competence Centre °CALOR, Department Life, Light & Matter, University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany;
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Haemmerle P, Aeschbacher S, Springer A, Eken C, Coslovsky M, Dutilh G, Moschovitis G, Rodondi N, Chocano P, Conen D, Osswald S, Kuehne M, Zuern CS. Cardiac autonomic function and cognitive performance in patients with atrial fibrillation. Europace 2021. [DOI: 10.1093/europace/euab116.161] [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: 11/12/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Foundation. Main funding source(s): Swiss National Science Foundation
OnBehalf
Swiss-AF Investigators
Background
Atrial fibrillation (AF) is associated with loss of cognition and dementia. Cardiac autonomic dysfunction has been linked to cognitive decline. We aimed to investigate if reduced cardiac autonomic function (CAF) is associated with cognitive impairment in AF patients.
Methods
Patients with paroxysmal, persistent and permanent AF were enrolled from a multicenter cohort study if they presented in AF ("AF group") or in sinus rhythm ("SR group") on a baseline 5-minute ECG recording. Parameters quantifying CAF (heart rate variability triangular index (HRVI), mean heart rate (MHR), the root mean square of successive differences (RMSSD) and the standard deviation of the normal-to-normal intervals (SDNN)) were calculated. We used the Montreal Cognitive Assessment (MoCA) to assess global cognitive function.
Results
1,685 AF patients with a mean age of 73 ± 8 years, 29% females, were included. The MoCA score was 24.5 ± 3.2 in the AF group (n = 710 patients) and 25.4 ± 3.2 in the SR group (n = 975 patients). After adjusting for multiple confounders, lower HRVI was associated with lower MoCA scores, both in the SR group (β=0.049; 95% confidence interval (CI): 0.016 to 0.081; p = 0.003) and in the AF group (β=0.068; 95% CI: 0.020 to 0.116; p = 0.006). In the AF group, higher MHR was associated with a poorer performance in the MoCA (β=-0.008; 95% CI: -0.014 to -0.002; p = 0.014 ). Other parameters of CAF were not associated with cognition.
Conclusion
Our data suggest that impaired CAF is associated with worse cognitive performance in patients with AF. Elderly AF patients with impaired HRVI might undergo cognitive testing in order to screen for cognitive impairment.
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Affiliation(s)
- P Haemmerle
- University Hospital Basel, Cardiology , Basel, Switzerland
| | - S Aeschbacher
- University Hospital Basel, Cardiology , Basel, Switzerland
| | - A Springer
- University Hospital Basel, Cardiology , Basel, Switzerland
| | - C Eken
- University Hospital Basel, Cardiology , Basel, Switzerland
| | - M Coslovsky
- University Hospital Basel, Cardiology , Basel, Switzerland
| | - G Dutilh
- University of Basel, Economic Psychology, Basel, Switzerland
| | - G Moschovitis
- Lugano Regional Hospital, Cardiology , Lugano, Switzerland
| | - N Rodondi
- Inselspital - University of Bern, Primary Health Care (BIHAM) and Internal General Internal Medicine, Bern, Switzerland
| | - P Chocano
- Inselspital - University of Bern, Primary Health Care (BIHAM), Bern, Switzerland
| | - D Conen
- McMaster University, Population Health Research Institute , Hamilton, Canada
| | - S Osswald
- University Hospital Basel, Cardiology , Basel, Switzerland
| | - M Kuehne
- University Hospital Basel, Cardiology , Basel, Switzerland
| | - CS Zuern
- University Hospital Basel, Cardiology , Basel, Switzerland
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Riaz A, Witte K, Bodnar W, Seitz H, Schell N, Springer A, Burkel E. Tunable Pseudo-Piezoelectric Effect in Doped Calcium Titanate for Bone Tissue Engineering. Materials (Basel) 2021; 14:ma14061495. [PMID: 33803796 PMCID: PMC8003264 DOI: 10.3390/ma14061495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/11/2021] [Accepted: 03/16/2021] [Indexed: 11/16/2022]
Abstract
CaTiO3 is a promising candidate as a pseudo-piezoelectric scaffold material for bone implantation. In this study, pure and magnesium/iron doped CaTiO3 are synthesized by sol-gel method and spark plasma sintering. Energy dispersive X-ray mapping confirm the homogenous distribution of doping elements in sintered samples. High-energy X-ray diffraction investigations reveal that doping of nanostructured CaTiO3 increased the strain and defects in the structure of CaTiO3 compared to the pure one. This led to a stronger pseudo-piezoelectric effect in the doped samples. The charge produced in magnesium doped CaTiO3 due to the direct piezoelectric effect is (2.9 ± 0.1) pC which was larger than the one produced in pure CaTiO3 (2.1 ± 0.3) pC, whereas the maximum charge was generated by iron doped CaTiO3 with (3.6 ± 0.2) pC. Therefore, the pseudo-piezoelectric behavior can be tuned by doping. This tuning of pseudo-piezoelectric response provides the possibility to systematically study the bone response using different piezoelectric strengths and possibly adjust for bone tissue engineering.
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Affiliation(s)
- Abdullah Riaz
- Chair of Microfluidics, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany;
- Correspondence: ; Tel.: +49-381-498-9138
| | - Kerstin Witte
- INP Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany; (K.W.); (W.B.)
| | - Wiktor Bodnar
- INP Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany; (K.W.); (W.B.)
| | - Hermann Seitz
- Chair of Microfluidics, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany;
- Department of Life, Light and Matter, University of Rostock, Albert Einstein-Str. 25, 18059 Rostock, Germany
| | - Norbert Schell
- Helmholtz-Zentrum Geesthacht, Max Plank-Str. 1, 21502 Geesthacht, Germany;
| | - Armin Springer
- Medical Biology and Electron Microscopy Centre, University Medical Center Rostock, Strempel-Str. 14, 18057 Rostock, Germany;
| | - Eberhard Burkel
- Institute of Physics, University of Rostock, Albert Einstein-Str. 23-24, 18059 Rostock, Germany;
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Keiler J, Schulze M, Dreger R, Springer A, Öner A, Wree A. Quantitative and Qualitative Assessment of Adhesive Thrombo-Fibrotic Lead Encapsulations (TFLE) of Pacemaker and ICD Leads in Arrhythmia Patients-A Post Mortem Study. Front Cardiovasc Med 2020; 7:602179. [PMID: 33330664 PMCID: PMC7734031 DOI: 10.3389/fcvm.2020.602179] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 11/09/2020] [Indexed: 12/13/2022] Open
Abstract
The demand for cardiac implantable electronic devices for arrhythmia therapy is still unabated and rising. Despite onward optimizations, lead-related problems such as infections or fractures often necessitate lead extraction. Due to adhesive thrombo-fibrotic lead encapsulations (TFLE) transvenous lead extraction is challenging and risky. However, knowledge on TFLEs and possible correlations with technical lead parameters and dwelling time (DT) were hitherto insufficiently studied. Therefore, we analyzed TFLEs of 62 lead from 35 body donor corpses to gain information for a potential lead design optimization. We examined both TFLE topography on the basis on anatomical landmarks and histo-morphological TFLE characteristics by means of histological paraffin sections and scanning electron microscopy of decellularized samples. The macroscopic analysis revealed that all leads were affected by TFLEs, mainly in the lead bearing veins. Half (47.2%) of the right-ventricular leads possessed adhesions to the tricuspid valve. On average, 49.9 ± 21.8% of the intravascular lead length was covered by TFLE of which 82.8 ± 16.2% were adhesive wall bindings (WB). The discrete TFLEs with at least one WB portion had a mean length of 95.0 ± 64.3 mm and a maximum of 200 mm. Neither sex, DT nor certain technical lead parameters showed distinct tendencies to promote or prevent TFLE. TFLE formation seems to start early in the first 1-2 weeks after implantation. The degree of fibrotization of the TFLE, starting with a thrombus, was reflected by the amount of compacted collagenous fibers and likewise largely independent from DT. TFLE thickness often reached several hundred micrometers. Calcifications were occasionally seen and appeared irregularly along the TFLE sheath. Leadless pacemaker systems have the advantage to overcome the problem with TFLEs but hold their own specific risks and limitations which are not fully known yet.
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Affiliation(s)
- Jonas Keiler
- Department of Anatomy, Rostock University Medical Center, Rostock, Germany
| | - Marko Schulze
- Department of Anatomy, Rostock University Medical Center, Rostock, Germany
| | - Ronja Dreger
- Divisions of Cardiology, Rostock University Medical Center, Rostock, Germany
| | - Armin Springer
- Medical Biology and Electron Microscopy Center, Rostock University Medical Center, Rostock, Germany
| | - Alper Öner
- Divisions of Cardiology, Rostock University Medical Center, Rostock, Germany
| | - Andreas Wree
- Department of Anatomy, Rostock University Medical Center, Rostock, Germany
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Jung P, Baumann K, Emrich D, Springer A, Felde VJ, Dultz S, Baum C, Frank M, Büdel B, Leinweber P. Lichens Bite the Dust - A Bioweathering Scenario in the Atacama Desert. iScience 2020; 23:101647. [PMID: 33103085 PMCID: PMC7578742 DOI: 10.1016/j.isci.2020.101647] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 09/25/2020] [Accepted: 10/01/2020] [Indexed: 11/23/2022] Open
Abstract
Bioweathering mediated by microorganisms plays a significant role in biogeochemical cycles on global scales over geological timescales. Single processes induced by specific taxa have been described but could rarely be demonstrated for complex communities that dominate whole landscapes. The recently discovered grit crust of the coastal Atacama Desert, which is a transitional community between a cryptogamic ground cover and a rock-bound lithic assemblage, offers the unique chance to elucidate various bioweathering processes that occur simultaneously. Here, we present a bioweathering scenario of this biocenosis including processes such as penetration of the lithomatrix, microbial responses to wet-dry cycles, alkalinolysis, enzyme activity, and mineral re-localization. Frequently occurring fog, for example, led to a volume increase of microorganisms and the lithomatrix. This, together with pH shifts and dust accumulation, consequently results in biophysical breakdown and the formation of a terrestrial protopedon, an initial stage of pedogenesis fueled by the grit crust.
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Affiliation(s)
- Patrick Jung
- Applied Logistics and Polymer Sciences, University of Applied Sciences Kaiserslautern, Carl-Schurz-Straße 10-16, 66953 Pirmasens, Germany
| | - Karen Baumann
- Faculty of Agricultural and Environmental Science, Soil Science, University of Rostock, Justus-von-Liebig-Weg 6, 18051 Rostock, Germany
| | - Dina Emrich
- University of Freiburg, Faculty of Environment and Natural Resources, Chair of Applied Vegetation Ecology, Tennenbacher Str. 4, 79106 Freiburg, Germany
| | - Armin Springer
- Medical Biology and Electron Microscopy Centre, University Medicine Rostock, Strempelstraße 14, 18057 Rostock, Germany
- Department Life, Light and Matter, University of Rostock, 18051 Rostock, Germany
| | - Vincent J.M.N.L. Felde
- Department of Soil Science, Faculty of Organic Agricultural Sciences, University of Kassel, Nordbahnhofstr. 1a, 37213 Witzenhausen, Germany
| | - Stefan Dultz
- Institute of Soil Science, Leibniz Universität Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany
| | - Christel Baum
- Faculty of Agricultural and Environmental Science, Soil Science, University of Rostock, Justus-von-Liebig-Weg 6, 18051 Rostock, Germany
| | - Marcus Frank
- Medical Biology and Electron Microscopy Centre, University Medicine Rostock, Strempelstraße 14, 18057 Rostock, Germany
- Department Life, Light and Matter, University of Rostock, 18051 Rostock, Germany
| | - Burkhard Büdel
- Plant Ecology and Systematics, University of Kaiserslautern, Erwin-Schrödinger-Straße, 67663 Kaiserslautern, Germany
| | - Peter Leinweber
- Faculty of Agricultural and Environmental Science, Soil Science, University of Rostock, Justus-von-Liebig-Weg 6, 18051 Rostock, Germany
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Nguyen MN, Kragl U, Barke I, Lange R, Lund H, Frank M, Springer A, Aladin V, Corzilius B, Hollmann D. Coagulation using organic carbonates opens up a sustainable route towards regenerated cellulose films. Commun Chem 2020; 3:116. [PMID: 36703311 PMCID: PMC9814763 DOI: 10.1038/s42004-020-00360-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 07/17/2020] [Indexed: 01/29/2023] Open
Abstract
Due to their biodegradability, biocompatibility and sustainable nature, regenerated cellulose (RC) films are of enormous relevance for green applications including medicinal, environmental and separation technologies. However, the processes used so far are very hazardous to the environment and health. Here, we disclose a simple, fast, environmentally friendly, nontoxic and cost-effective processing method for preparing RC films. High quality non-transparent and transparent RC films and powders can be produced by dissolution with tetrabutylphosphonium hydroxide [TBPH]/[TBP]+[OH]- followed by coagulation with organic carbonates. Investigations on the coagulation mechanism revealed an extremely fast reaction between the carbonates and the hydroxide ions. The high-quality powders and films were fully characterized with respect to structure, surface morphology, permeation and selectivity. This method represents a future-oriented green alternative to known industrial processes.
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Affiliation(s)
- Mai N. Nguyen
- grid.10493.3f0000000121858338Department Life, Light & Matter, Faculty for Interdisciplinary Research, University of Rostock, Albert-Einstein-Straße 25, 18059 Rostock, Germany ,grid.440792.cSchool of Chemical Engineering, Hanoi University of Science and Technology, No. 1 Dai Co Viet street, 10000 Hanoi, Vietnam ,grid.10493.3f0000000121858338Department of Chemistry, University of Rostock, Albert-Einstein-Straße 3A, 18059 Rostock, Germany
| | - Udo Kragl
- grid.10493.3f0000000121858338Department Life, Light & Matter, Faculty for Interdisciplinary Research, University of Rostock, Albert-Einstein-Straße 25, 18059 Rostock, Germany ,grid.10493.3f0000000121858338Department of Chemistry, University of Rostock, Albert-Einstein-Straße 3A, 18059 Rostock, Germany ,grid.440957.b0000 0000 9599 5258Leibniz Institute for Catalysis, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Ingo Barke
- grid.10493.3f0000000121858338Institute of Physics, University of Rostock, Albert-Einstein-Straße 23-24, 18059 Rostock, Germany
| | - Regina Lange
- grid.10493.3f0000000121858338Institute of Physics, University of Rostock, Albert-Einstein-Straße 23-24, 18059 Rostock, Germany
| | - Henrik Lund
- grid.440957.b0000 0000 9599 5258Leibniz Institute for Catalysis, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Marcus Frank
- grid.10493.3f0000000121858338Department Life, Light & Matter, Faculty for Interdisciplinary Research, University of Rostock, Albert-Einstein-Straße 25, 18059 Rostock, Germany ,grid.10493.3f0000000121858338Medical Biology and Electron Microscopy Centre, University Medicine Rostock, 18059 Rostock, Germany
| | - Armin Springer
- grid.10493.3f0000000121858338Medical Biology and Electron Microscopy Centre, University Medicine Rostock, 18059 Rostock, Germany
| | - Victoria Aladin
- grid.10493.3f0000000121858338Department Life, Light & Matter, Faculty for Interdisciplinary Research, University of Rostock, Albert-Einstein-Straße 25, 18059 Rostock, Germany ,grid.10493.3f0000000121858338Department of Chemistry, University of Rostock, Albert-Einstein-Straße 3A, 18059 Rostock, Germany
| | - Björn Corzilius
- grid.10493.3f0000000121858338Department Life, Light & Matter, Faculty for Interdisciplinary Research, University of Rostock, Albert-Einstein-Straße 25, 18059 Rostock, Germany ,grid.10493.3f0000000121858338Department of Chemistry, University of Rostock, Albert-Einstein-Straße 3A, 18059 Rostock, Germany
| | - Dirk Hollmann
- grid.10493.3f0000000121858338Department Life, Light & Matter, Faculty for Interdisciplinary Research, University of Rostock, Albert-Einstein-Straße 25, 18059 Rostock, Germany ,grid.10493.3f0000000121858338Department of Chemistry, University of Rostock, Albert-Einstein-Straße 3A, 18059 Rostock, Germany
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Köhler J, Maletzki C, Koczan D, Frank M, Springer A, Steffen C, Revenko AS, MacLeod AR, Mikkat S, Kreikemeyer B, Oehmcke-Hecht S. Kininogen supports inflammation and bacterial spreading during Streptococccus Pyogenes Sepsis. EBioMedicine 2020; 58:102908. [PMID: 32707450 PMCID: PMC7381504 DOI: 10.1016/j.ebiom.2020.102908] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/24/2020] [Accepted: 07/08/2020] [Indexed: 10/31/2022] Open
Abstract
BACKGROUND High-molecular-weight kininogen is a cofactor of the human contact system, an inflammatory response mechanism that is activated during sepsis. It has been shown that high-molecular-weight kininogen contributes to endotoxemia, but is not critical for local host defense during pneumonia by Gram-negative bacteria. However, some important pathogens, such as Streptococcus pyogenes, can cleave kininogen by contact system activation. Whether kininogen causally affects antibacterial host defense in S. pyogenes infection, remains unknown. METHODS Kininogen concentration was determined in course plasma samples from septic patients. mRNA expression and degradation of kininogen was determined in liver or plasma of septic mice. Kininogen was depleted in mice by treatment with selective kininogen directed antisense oligonucleotides (ASOs) or a scrambled control ASO for 3 weeks prior to infection. 24 h after infection, infection parameters were determined. FINDINGS Data from human and mice samples indicate that kininogen is a positive acute phase protein. Lower kininogen concentration in plasma correlate with a higher APACHE II score in septic patients. We show that ASO-mediated depletion of kininogen in mice indeed restrains streptococcal spreading, reduces levels of proinflammatory cytokines such as IL-1β and IFNγ, but increased intravascular tissue factor and fibrin deposition in kidneys of septic animals. INTERPRETATION Mechanistically, kininogen depletion results in reduced plasma kallikrein levels and, during sepsis, in increased intravascular tissue factor that may reinforce immunothrombosis, and thus reduce streptococcal spreading. These novel findings point to an anticoagulant and profibrinolytic role of kininogens during streptococcal sepsis. FUNDING Full details are provided in the Acknowledgements section.
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Affiliation(s)
- Juliane Köhler
- Institute of Medical Microbiology, Virology and Hygiene, Rostock University Medical Center, Rostock, Germany
| | - Claudia Maletzki
- Department of Internal Medicine, Medical Clinic III - Hematology, Oncology, Palliative Care, Rostock University Medical Center, Rostock, Germany
| | - Dirk Koczan
- Center for Medical Research - Core Facility Micro-Array-Technology, Rostock University Medical Center, Rostock, Germany
| | - Marcus Frank
- Medical Biology and Electron Microscopy Centre, Rostock University Medical Center, Rostock, Germany; Department of Life, Light and Matter, Rostock University, Rostock, Germany
| | - Armin Springer
- Medical Biology and Electron Microscopy Centre, Rostock University Medical Center, Rostock, Germany
| | - Carolin Steffen
- Institute of Medical Microbiology, Virology and Hygiene, Rostock University Medical Center, Rostock, Germany
| | - Alexey S Revenko
- Department of Antisense Drug Discovery, Ionis Pharmaceuticals, Inc., Carlsbad, CA 92008, USA
| | - A Robert MacLeod
- Department of Antisense Drug Discovery, Ionis Pharmaceuticals, Inc., Carlsbad, CA 92008, USA
| | - Stefan Mikkat
- Core Facility Proteome Analysis, Rostock University Medical Center, Rostock, Germany
| | - Bernd Kreikemeyer
- Institute of Medical Microbiology, Virology and Hygiene, Rostock University Medical Center, Rostock, Germany
| | - Sonja Oehmcke-Hecht
- Institute of Medical Microbiology, Virology and Hygiene, Rostock University Medical Center, Rostock, Germany.
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Spinoit AF, Tack L, Van Hoecke E, Springer A, Riedl S, Tonnhofer U, Hiess M, Weninger J, Van Laecke E, Hoebeke P, Cools M. Long-term psychosexual outcome of men born with hypospadias. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)34011-8] [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: 10/23/2022] Open
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Waletzko J, Dau M, Seyfarth A, Springer A, Frank M, Bader R, Jonitz-Heincke A. Devitalizing Effect of High Hydrostatic Pressure on Human Cells-Influence on Cell Death in Osteoblasts and Chondrocytes. Int J Mol Sci 2020; 21:ijms21113836. [PMID: 32481635 PMCID: PMC7312382 DOI: 10.3390/ijms21113836] [Citation(s) in RCA: 8] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 05/25/2020] [Accepted: 05/26/2020] [Indexed: 12/13/2022] Open
Abstract
Chemical and physical processing of allografts is associated with a significant reduction in biomechanics. Therefore, treatment of tissue with high hydrostatic pressure (HHP) offers the possibility to devitalize tissue gently without changing biomechanical properties. To obtain an initial assessment of the effectiveness of HHP treatment, human osteoblasts and chondrocytes were treated with different HHPs (100–150 MPa, 250–300 MPa, 450–500 MPa). Devitalization efficiency was determined by analyzing the metabolic activity via WST-1(water-soluble tetrazolium salt) assay. The type of cell death was detected with an apoptosis/necrosis ELISA (enzyme-linked immune sorbent assay) and flow cytometry. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were carried out to detect the degree of cell destruction. After HHP treatment, the metabolic activities of both cell types decreased, whereas HHP of 250 MPa and higher resulted in metabolic inactivation. Further, the highest HHP range induced mostly necrosis while the lower HHP ranges induced apoptosis and necrosis equally. FESEM and TEM analyses of treated osteoblasts revealed pressure-dependent cell damage. In the present study, it could be proven that a pressure range of 250–300 MPa can be used for cell devitalization. However, in order to treat bone and cartilage tissue gently with HHP, the results of our cell experiments must be verified for tissue samples in future studies.
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Affiliation(s)
- Janine Waletzko
- Department of Oral, Maxillofacial and Plastic Surgery, University Medical Center Rostock, 18057 Rostock, Germany;
- Correspondence: ; Tel.: +49-381-494-9336; Fax: +49-381-494-6698
| | - Michael Dau
- Department of Oral, Maxillofacial and Plastic Surgery, University Medical Center Rostock, 18057 Rostock, Germany;
| | - Anika Seyfarth
- Department of Orthopedics, Biomechanics and Implant Technology Research Laboratory, University Medical Center Rostock, 18057 Rostock, Germany; (A.S.); (R.B.); (A.J.-H.)
| | - Armin Springer
- Medical Biology and Electron Microscopy Center, University Medical Center Rostock, 18057 Rostock, Germany; (A.S.); (M.F.)
- Department Life, Light & Matter, University of Rostock, 18059 Rostock, Germany
| | - Marcus Frank
- Medical Biology and Electron Microscopy Center, University Medical Center Rostock, 18057 Rostock, Germany; (A.S.); (M.F.)
- Department Life, Light & Matter, University of Rostock, 18059 Rostock, Germany
| | - Rainer Bader
- Department of Orthopedics, Biomechanics and Implant Technology Research Laboratory, University Medical Center Rostock, 18057 Rostock, Germany; (A.S.); (R.B.); (A.J.-H.)
| | - Anika Jonitz-Heincke
- Department of Orthopedics, Biomechanics and Implant Technology Research Laboratory, University Medical Center Rostock, 18057 Rostock, Germany; (A.S.); (R.B.); (A.J.-H.)
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Osten J, Milkereit B, Reich M, Yang B, Springer A, Nowak K, Kessler O. Development of Precipitation Hardening Parameters for High Strength Alloy AA 7068. Materials (Basel) 2020; 13:ma13040918. [PMID: 32092926 PMCID: PMC7078699 DOI: 10.3390/ma13040918] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/30/2020] [Accepted: 02/05/2020] [Indexed: 11/16/2022]
Abstract
The mechanical properties after age hardening heat treatment and the kinetics of related phase transformations of high strength AlZnMgCu alloy AA 7068 were investigated. The experimental work includes differential scanning calorimetry (DSC), differential fast scanning calorimetry (DFSC), sophisticated differential dilatometry (DIL), scanning electron microscopy (SEM), as well as hardness and tensile tests. For the kinetic analysis of quench induced precipitation by dilatometry new metrological methods and evaluation procedures were established. Using DSC, dissolution behaviour during heating to solution annealing temperature was investigated. These experiments allowed for identification of the appropriate temperature and duration for the solution heat treatment. Continuous cooling experiments in DSC, DFSC, and DIL determined the kinetics of quench induced precipitation. DSC and DIL revealed several overlapping precipitation reactions. The critical cooling rate for a complete supersaturation of the solid solution has been identified to be 600 to 800 K/s. At slightly subcritical cooling rates quench induced precipitation results in a direct hardening effect resulting in a technological critical cooling rate of about 100 K/s, i.e., the hardness after ageing reaches a saturation level for cooling rates faster than 100 K/s. Maximum yield strength of above 600 MPa and tensile strength of up to 650 MPa were attained.
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Affiliation(s)
- Julia Osten
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany (B.M.); (B.Y.); (O.K.)
| | - Benjamin Milkereit
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany (B.M.); (B.Y.); (O.K.)
- Competence Centre °CALOR, Department Life, Light & Matter, Faculty of Interdisciplinary Research, University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany
| | - Michael Reich
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany (B.M.); (B.Y.); (O.K.)
- Correspondence: ; Tel.: +49-381-498-9490
| | - Bin Yang
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany (B.M.); (B.Y.); (O.K.)
| | - Armin Springer
- Electron Microscopic Centre, University Medical Centre Rostock, Strempelstraße 14, 18057 Rostock, Germany;
| | - Karina Nowak
- Fraunhofer Research Institution for Large Structures in Production Engineering IGP, Albert Einstein-Str. 30, 18059 Rostock, Germany;
| | - Olaf Kessler
- Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Justus-von-Liebig-Weg 2, 18059 Rostock, Germany (B.M.); (B.Y.); (O.K.)
- Competence Centre °CALOR, Department Life, Light & Matter, Faculty of Interdisciplinary Research, University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany
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Kovalchuk V, Voronkina A, Binnewerg B, Schubert M, Muzychka L, Wysokowski M, Tsurkan MV, Bechmann N, Petrenko I, Fursov A, Martinovic R, Ivanenko VN, Fromont J, Smolii OB, Joseph Y, Giovine M, Erpenbeck D, Gelinsky M, Springer A, Guan K, Bornstein SR, Ehrlich H. Naturally Drug-Loaded Chitin: Isolation and Applications. Mar Drugs 2019; 17:E574. [PMID: 31658704 PMCID: PMC6835269 DOI: 10.3390/md17100574] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 10/05/2019] [Accepted: 10/08/2019] [Indexed: 12/15/2022] Open
Abstract
Naturally occurring three-dimensional (3D) biopolymer-based matrices that can be used in different biomedical applications are sustainable alternatives to various artificial 3D materials. For this purpose, chitin-based structures from marine sponges are very promising substitutes. Marine sponges from the order Verongiida (class Demospongiae) are typical examples of demosponges with well-developed chitinous skeletons. In particular, species belonging to the family Ianthellidae possess chitinous, flat, fan-like fibrous skeletons with a unique, microporous 3D architecture that makes them particularly interesting for applications. In this work, we focus our attention on the demosponge Ianthella flabelliformis (Linnaeus, 1759) for simultaneous extraction of both naturally occurring ("ready-to-use") chitin scaffolds, and biologically active bromotyrosines which are recognized as potential antibiotic, antitumor, and marine antifouling substances. We show that selected bromotyrosines are located within pigmental cells which, however, are localized within chitinous skeletal fibers of I. flabelliformis. A two-step reaction provides two products: treatment with methanol extracts the bromotyrosine compounds bastadin 25 and araplysillin-I N20 sulfamate, and a subsequent treatment with acetic acid and sodium hydroxide exposes the 3D chitinous scaffold. This scaffold is a mesh-like structure, which retains its capillary network, and its use as a potential drug delivery biomaterial was examined for the first time. The results demonstrate that sponge-derived chitin scaffolds, impregnated with decamethoxine, effectively inhibit growth of the human pathogen Staphylococcus aureus in an agar diffusion assay.
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Affiliation(s)
- Valentine Kovalchuk
- Department of Microbiology, National Pirogov Memorial Medical University, Vinnytsia 21018, Ukraine.
| | - Alona Voronkina
- Department of Pharmacy, National Pirogov Memorial Medical University, Vinnytsia 21018, Ukraine.
| | - Björn Binnewerg
- Institute of Pharmacology and Toxicology, TU Dresden, Dresden 01307, Germany.
| | - Mario Schubert
- Institute of Pharmacology and Toxicology, TU Dresden, Dresden 01307, Germany.
| | - Liubov Muzychka
- V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Science of Ukraine, Murmanska Str. 1, Kyiv 02094, Ukraine.
| | - Marcin Wysokowski
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, Poznan 60965, Poland.
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner Str. 3, Freiberg 09599, Germany.
| | - Mikhail V Tsurkan
- Leibniz Institute for Polymer Research Dresden, Dresden 01069, Germany.
| | - Nicole Bechmann
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Carl Gustav Carus, Faculty of Medicine Carl Gustav Carus, TU Dresden, Dresden 01307, Germany.
| | - Iaroslav Petrenko
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner Str. 3, Freiberg 09599, Germany.
| | - Andriy Fursov
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner Str. 3, Freiberg 09599, Germany.
| | - Rajko Martinovic
- Institute of Marine Biology, University of Montenegro, Kotor 85330, Montenegro.
| | - Viatcheslav N Ivanenko
- Department of Invertebrate Zoology, Biological Faculty, Lomonosov Moscow State University, Moscow 119992, Russia.
| | - Jane Fromont
- Aquatic Zoology Department, Western Australian Museum, Locked Bag 49, Welshpool DC, Western Australia WA6986, Australia.
| | - Oleg B Smolii
- V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Science of Ukraine, Murmanska Str. 1, Kyiv 02094, Ukraine.
| | - Yvonne Joseph
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner Str. 3, Freiberg 09599, Germany.
| | - Marco Giovine
- Department of Sciences of Earth, Environment and Life, University of Genoa, Corso Europa 26, 16132 Genova, Italy.
| | - Dirk Erpenbeck
- Department of Earth and Environmental Sciences & GeoBio-Center, Ludwig-Maximilians-Universität München, Richard-Wagner-Str. 10, Munich 80333, Germany.
| | - Michael Gelinsky
- Centre for Translational Bone, Joint and Soft Tissue Research, Faculty of Medicine and University Hospital Carl Gustav Carus of Technische Universität Dresden, Fetscherstraße 74, Dresden 01307, Germany.
| | - Armin Springer
- Centre for Translational Bone, Joint and Soft Tissue Research, Faculty of Medicine and University Hospital Carl Gustav Carus of Technische Universität Dresden, Fetscherstraße 74, Dresden 01307, Germany.
- Medizinische Biologie und Elektronenmikroskopisches Zentrum (EMZ), Universitätsmedizin Rostock, Rostock 18055, Germany.
| | - Kaomei Guan
- Institute of Pharmacology and Toxicology, TU Dresden, Dresden 01307, Germany.
| | - Stefan R Bornstein
- Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden 01307, Germany.
- Diabetes and Nutritional Sciences Division, King's College London, London WC2R 2LS, UK.
| | - Hermann Ehrlich
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner Str. 3, Freiberg 09599, Germany.
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Jandl NM, Rolvien T, Gätjen D, Jonitz-Heincke A, Springer A, Krenn V, Bader R, Rüther W. Recurrent arthrocele and sterile sinus tract formation due to ceramic wear as a differential diagnosis of periprosthetic joint infection - a case report. Acta Orthop 2019; 90:501-504. [PMID: 31094272 PMCID: PMC6746295 DOI: 10.1080/17453674.2019.1616997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Affiliation(s)
- Nico Maximilian Jandl
- Department of Orthopedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; ,Orthopedic University Hospital Bad Bramstedt;; ,Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg; ,Correspondence:
| | - Tim Rolvien
- Department of Orthopedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; ,Orthopedic University Hospital Bad Bramstedt;; ,Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg;
| | - Daniel Gätjen
- Department of Orthopedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; ,Orthopedic University Hospital Bad Bramstedt;;
| | - Anika Jonitz-Heincke
- Department of Orthopedics, Biomechanics and Implant Technology Research Laboratory, Rostock University Medical Center, Rostock;
| | - Armin Springer
- Medical Biology and Electron Microscopy Center, Rostock University Medical Center, Rostock;
| | - Veit Krenn
- MVZ-Zentrum für Histologie, Zytologie und Molekulare Diagnostik, Trier, Germany
| | - Rainer Bader
- Department of Orthopedics, Biomechanics and Implant Technology Research Laboratory, Rostock University Medical Center, Rostock;
| | - Wolfgang Rüther
- Department of Orthopedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; ,Orthopedic University Hospital Bad Bramstedt;;
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Rustgi S, Springer A, Kang C, von Wettstein D, Reinbothe C, Reinbothe S, Pollmann S. ALLENE OXIDE SYNTHASE and HYDROPEROXIDE LYASE, Two Non-Canonical Cytochrome P450s in Arabidopsis thaliana and Their Different Roles in Plant Defense. Int J Mol Sci 2019; 20:ijms20123064. [PMID: 31234561 PMCID: PMC6627107 DOI: 10.3390/ijms20123064] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 06/19/2019] [Accepted: 06/20/2019] [Indexed: 11/16/2022] Open
Abstract
The channeling of metabolites is an essential step of metabolic regulation in all living organisms. Multifunctional enzymes with defined domains for metabolite compartmentalization are rare, but in many cases, larger assemblies forming multimeric protein complexes operate in defined metabolic shunts. In Arabidopsis thaliana, a multimeric complex was discovered that contains a 13-lipoxygenase and allene oxide synthase (AOS) as well as allene oxide cyclase. All three plant enzymes are localized in chloroplasts, contributing to the biosynthesis of jasmonic acid (JA). JA and its derivatives act as ubiquitous plant defense regulators in responses to both biotic and abiotic stresses. AOS belongs to the superfamily of cytochrome P450 enzymes and is named CYP74A. Another CYP450 in chloroplasts, hydroperoxide lyase (HPL, CYP74B), competes with AOS for the common substrate. The products of the HPL reaction are green leaf volatiles that are involved in the deterrence of insect pests. Both enzymes represent non-canonical CYP450 family members, as they do not depend on O2 and NADPH-dependent CYP450 reductase activities. AOS and HPL activities are crucial for plants to respond to different biotic foes. In this mini-review, we aim to summarize how plants make use of the LOX2–AOS–AOC2 complex in chloroplasts to boost JA biosynthesis over volatile production and how this situation may change in plant communities during mass ingestion by insect pests.
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Affiliation(s)
- Sachin Rustgi
- Department of Plant and Environmental Sciences, Pee Dee Research and Education Center, Clemson University, Florence, SC 29506, USA.
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USA.
| | - Armin Springer
- Medizinische Biologie und Elektronenmikroskopisches Zentrum (EMZ), Universitätsmedizin Rostock, 18055 Rostock, Germany.
| | - ChulHee Kang
- Department of Chemistry, Biomolecular Crystallography Center, Washington State University, Pullman, WA 99164, USA.
| | - Diter von Wettstein
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USA.
| | - Christiane Reinbothe
- Biologie Environnementale et Systémique (BEEeSy), Université Grenoble Alpes, BP 53, CEDEX, F-38041 Grenoble, France.
| | - Steffen Reinbothe
- Biologie Environnementale et Systémique (BEEeSy), Université Grenoble Alpes, BP 53, CEDEX, F-38041 Grenoble, France.
| | - Stephan Pollmann
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentación (INIA), Campus de Montegancedo, 28223 Pozuelo de Alarcón, Madrid, Spain.
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Dilla M, Moustakas NG, Becerikli AE, Peppel T, Springer A, Schlögl R, Strunk J, Ristig S. Judging the feasibility of TiO 2 as photocatalyst for chemical energy conversion by quantitative reactivity determinants. Phys Chem Chem Phys 2019; 21:13144-13150. [PMID: 31172148 DOI: 10.1039/c9cp00981g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study we assess the general applicability of the widely used P25-TiO2 in gas-phase photocatalytic CO2 reduction based on experimentally determined reactivity descriptors from classical heterogeneous catalysis (productivity) and photochemistry (apparent quantum yield/AQY). A comparison of the results with reports on the use of P25 for thermodynamically more feasible reactions and our own previous studies on P25-TiO2 as photocatalyst imply that the catalytic functionality of this material, rather than its properties as photoabsorber, limits its applicability in the heterogeneous photocatalytic CO2 reduction in the gas phase. The AQY of IrOx/TiO2 in overall water splitting in a similar high-purity gas-solid process was four times as high, but still far from commercial viability.
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Affiliation(s)
- Martin Dilla
- Max-Planck-Institut für Chemische Energiekonversion, 45470 Mülheim an der Ruhr, Germany.
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Pollmann S, Springer A, Rustgi S, von Wettstein D, Kang C, Reinbothe C, Reinbothe S. Substrate channeling in oxylipin biosynthesis through a protein complex in the plastid envelope of Arabidopsis thaliana. J Exp Bot 2019; 70:1483-1495. [PMID: 30690555 PMCID: PMC6411374 DOI: 10.1093/jxb/erz015] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 01/06/2019] [Indexed: 05/20/2023]
Abstract
Oxygenated membrane fatty acid derivatives termed oxylipins play important roles in plant defense against biotic and abiotic cues. Plants challenged by insect pests, for example, synthesize a blend of different defense compounds that include volatile aldehydes and jasmonic acid (JA), among others. Because all oxylipins are derived from the same pathway, we investigated how their synthesis might be regulated, focusing on two closely related atypical cytochrome P450 enzymes designated CYP74A and CYP74B, respectively, allene oxide synthase (AOS) and hydroperoxide lyase (HPL). These enzymes compete for the same substrate but give rise to different products: the final product of the AOS branch of the oxylipin pathway is JA, while those of the HPL branch comprise volatile aldehydes and alcohols. AOS and HPL are plastid envelope enzymes in Arabidopsis thaliana but accumulate at different locations. Biochemical experiments identified AOS as a constituent of complexes also containing lipoxygenase 2 (LOX2) and allene oxide cyclase (AOC), which catalyze consecutive steps in JA precursor biosynthesis, while excluding the concurrent HPL reaction. Based on published X-ray data, the structure of this complex was modelled and amino acids involved in catalysis and subunit interactions predicted. Genetic studies identified the microRNA 319-regulated clade of TCP (TEOSINTE BRANCHED/CYCLOIDEA/PCF) transcription factor genes and CORONATINE INSENSITIVE 1 (COI1) as controlling JA production through the LOX2-AOS-AOC2 complex. Together, our results define a molecular branch point in oxylipin biosynthesis that allows fine-tuning of the plant's defense machinery in response to biotic and abiotic stimuli.
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Affiliation(s)
- Stephan Pollmann
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) – Instituto Nacional de Investigación y Tecnología Agraria y Alimentación (INIA), Campus de Montegancedo, Pozuelo de Alarcón (Madrid), Spain
- Correspondence: or
| | - Armin Springer
- Medizinische Biologie und Elektronenmikroskopisches Zentrum (EMZ), Universitätsmedizin Rostock, Rostock, Germany
| | - Sachin Rustgi
- Department of Plant and Environmental Sciences, Pee Dee Research and Education Center, Clemson University, Florence, SC, USA
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
- Molecular Plant Sciences Program, Washington State University, Pullman, WA, USA
| | - Diter von Wettstein
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
- Molecular Plant Sciences Program, Washington State University, Pullman, WA, USA
- Center for Reproductive Biology, Washington State University, Pullman, WA, USA
| | - ChulHee Kang
- Department of Chemistry, Washington State University, Pullman, WA, USA
- School of Molecular Biosciences, Washington State University, Pullman, WA, USA
- Biomolecular Crystallography Center, Washington State University, Pullman, WA, USA
| | - Christiane Reinbothe
- Laboratoire de Génétique Moléculaire des Plantes, Université Grenoble Alpes, CEDEX, France
| | - Steffen Reinbothe
- Laboratoire de Génétique Moléculaire des Plantes, Université Grenoble Alpes, CEDEX, France
- Correspondence: or
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Wetegrove M, Witte K, Bodnar W, Pfahl DE, Springer A, Schell N, Westphal F, Burkel E. Formation of maghemite nanostructures in polyol: tuning the particle size via the precursor stoichiometry. CrystEngComm 2019. [DOI: 10.1039/c8ce02115e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Investigating the polyol-assisted synthesis of maghemite nanoflowers, a strong impact of the iron precursor stoichiometry on physical properties is found.
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Affiliation(s)
| | - Kerstin Witte
- University of Rostock
- Institute of Physics
- 18059 Rostock
- Germany
| | - Wiktor Bodnar
- INP Leibniz Institute for Plasma Science and Technology
- 17489 Greifswald
- Germany
| | - Dan-Eric Pfahl
- University of Rostock
- Institute of Physics
- 18059 Rostock
- Germany
| | - Armin Springer
- University Medicine Rostock
- Medical Biology and Electron Microscopy Centre
- 18057 Rostock
- Germany
| | - Norbert Schell
- Helmholtz Centre Geesthacht
- Institute of Materials Research
- 21502 Geesthacht
- Germany
| | | | - Eberhard Burkel
- University of Rostock
- Institute of Physics
- 18059 Rostock
- Germany
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Manegold S, Springer A, Märdia S, Tsitsilonis S. Treatment Algorithm for Pilon Fracture - Clinical and Radiological Results. Acta Chir Orthop Traumatol Cech 2019; 86:11-17. [PMID: 30843508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
PURPOSE OF THE STUDY The aim of the present study was to evaluate the postoperative outcome of patients with pilon tibial fractures with a minimum follow-up of 24 months, treated according to a staged treatment algorithm. MATERIAL AND METHODS In total, 27 patients (mean age 43.6 ± 13 years, range 18-69) with a pilon tibial fracture and a minimum follow-up of 24 months were included in the study. Medical recordings (discharge documents and surgical reports) and radiographic examinations were analyzed. All enrolled patients were invited for a clinical and radiological follow-up examination (ROM, AOFAS hindfoot score, Kellgren score). The mean follow-up time was 44.5 ± 16 months (range 24-82). RESULTS In 21 cases a two-stage operative strategy with initial closed reduction and external fixation was necessary prior to definitive osteosynthesis. Overall, the patients scored 82.1 ± 20 points (range 30-100) in AOFAS hindfoot score, which represents a good clinical outcome. Patients with B-type fractures scored significantly better than those with C-type fractures. Patients with closed pilon tibial fractures reached significantly higher values in the AOFAS hindfoot score than those with open ones. Age and gender did not affect the functional outcome. Total ankle range of motion was 41° ± 10° for B-type fractures (range 20°-55°) and 35° ± 17° (range 0°-60°) for C-type fractures respectively (p > 0.05). Only five patients reached higher scores (Grade III) in Kellgren classification system. DISCUSSION Within the last decades, the therapeutic algorithm of pilon fractures underwent a paradigm shift; a two-stage protocol has prevailed today. However, the initial severity of the fracture in terms of initial absorbed energy, bony comminution and softtissue trauma still affects the outcome. Moreover, the necessity for bone grafting, as an indirect measurement of bone comminution and bone defects, resulted in higher degrees of osteoarthritis in the final follow-up. Higher initial soft-tissue injury also had an impact on the functional outcome of the patients, as patients with closed fractures scored better in AOFAS at the final follow-up. In order to counteract these risk factors and to reduce complications that define the outcome of these severe injuries, clearly defined surgical principles and standardized treatment protocols are needed. CONCLUSIONS The present study confirms the fact that meticulous planning, respect of the soft-tissues and choice of the optimal timepoint for the definitive osteosynthesis and overall treatment according to standardized protocols can optimize the outcome of this severe injury. Key words:pilon, distal tibia fracture, outcome, algorithm.
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Affiliation(s)
- S Manegold
- Charité - University Medicine Berlin, Center for Musculoskeletal Surgery, Berlin, Germany
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Mader F, Müller S, Krause L, Springer A, Kernig K, Protzel C, Porath K, Rackow S, Wittstock T, Frank M, Hakenberg OW, Köhling R, Kirschstein T. Hyperpolarization-Activated Cyclic Nucleotide-Gated Non-selective (HCN) Ion Channels Regulate Human and Murine Urinary Bladder Contractility. Front Physiol 2018; 9:753. [PMID: 29971015 PMCID: PMC6018223 DOI: 10.3389/fphys.2018.00753] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 05/29/2018] [Indexed: 11/16/2022] Open
Abstract
Purpose: Hyperpolarization-activated cyclic nucleotide gated non-selective (HCN) channels have been demonstrated in the urinary bladder in various species. Since they play a major role in governing rhythmic activity in pacemaker cells like in the sinoatrial node, we explored the role of these channels in human and murine detrusor smooth muscle. Methods: In an organ bath, human and murine detrusor smooth muscle specimens were challenged with the HCN channel blocker ZD7288. In human tissue derived from macroscopically tumor-free cancer resections, the urothelium was removed. In addition, HCN1-deficient mice were used to identify the contribution of this particular isoform. Expression of HCN channels in the urinary bladder was analyzed using histological and ultrastructural analyses as well as quantitative reverse transcriptase polymerase chain reaction (RT-PCR). Results: We found that the HCN channel blocker ZD7288 (50 μM) both induced tonic contractions and increased phasic contraction amplitudes in human and murine detrusor specimens. While these responses were not sensitive to tetrodotoxin, they were significantly reduced by the gap junction inhibitor 18β-glycyrrhetic acid suggesting that HCN channels are located within the gap junction-interconnected smooth muscle cell network rather than on efferent nerve fibers. Immunohistochemistry suggested HCN channel expression on smooth muscle tissue, and immunoelectron microscopy confirmed the scattered presence of HCN2 on smooth muscle cell membranes. HCN channels seem to be down-regulated with aging, which is paralleled by an increasing effect of ZD7288 in aging detrusor tissue. Importantly, the anticonvulsant and HCN channel activator lamotrigine relaxed the detrusor which could be reversed by ZD7288. Conclusion: These findings demonstrate that HCN channels are functionally present and localized on smooth muscle cells of the urinary bladder. Given the age-dependent decline of these channels in humans, activation of HCN channels by compounds such as lamotrigine opens up the opportunity to combat detrusor hyperactivity in the elderly by drugs already approved for epilepsy.
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Affiliation(s)
- Felix Mader
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Steffen Müller
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Ludwig Krause
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Armin Springer
- Department of Medical Biology, Electron Microscopy Center, University of Rostock, Rostock, Germany
| | - Karoline Kernig
- Department of Urology, University of Rostock, Rostock, Germany
| | - Chris Protzel
- Department of Urology, University of Rostock, Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Simone Rackow
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Tristan Wittstock
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Marcus Frank
- Department of Medical Biology, Electron Microscopy Center, University of Rostock, Rostock, Germany
| | | | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Timo Kirschstein
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
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Abstract
Background Clinical trials are vital for evidence-based cancer care. Oncologist engagement in clinical trials has an effect on patient recruitment, which in turn can affect trial success. Identifying barriers to clinical trial participation might enable interventions that could help to increase physician participation. Methods To assess factors affecting physician engagement in oncology trials, a national survey was conducted using the online SurveyMonkey tool (SurveyMonkey, San Mateo, CA, U.S.A.; http://www.surveymonkey.com). Physicians associated with the Canadian Cancer Clinical Trials Network and the Canadian Cancer Trials Group were asked about their specialty, years of experience, barriers to participation, and motivating interventions, which included an open-ended question inviting survey takers to suggest interventions. Results The survey collected 207 anonymous responses. Respondents were predominantly medical oncologists (46.4%), followed by radiation oncologists (24.6%). Almost 70% of the respondents had more than 10 years of experience. Significant time constraints included extra paperwork (77%), patient education (54%), and extended follow-up or clinic visits (53%). Timing of events within trials was also a barrier to participation (55%). Most respondents favoured clinical work credits (72%), academic credits (67%), a clinical trial alert system (75%), a regular meeting to review trial protocols (65%), and a screening log to aid in patient accrual (67%) as motivational strategies. Suggested interventions included increased support staff, streamlined regulatory burden, and provision of greater funding for trials and easier access to ancillary services. Conclusions The present study confirms that Canadian oncologists are willing to participate in clinical research, but face multiple barriers to trial participation. Those barriers could be mitigated by the implementation of several interventions identified in the study.
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Affiliation(s)
| | | | - A Springer
- Department of Health Sciences, Queen's University, Kingston, ON
| | - K Arts
- Canadian Cancer Clinical Trials Network, Toronto, ON
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Bittner M, Springer A, Schenk R, Melzig MF. Cultivation of Black Cohosh: Non-targeted Chemical Profiling and Comparison to Wild. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608500] [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: 10/18/2022]
Affiliation(s)
- M Bittner
- Freie Universität Berlin, Institute of Pharmacy, Pharmaceutical Biology, Berlin, Germany
| | - A Springer
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Core Facility BioSupraMol, Berlin, Germany
| | - R Schenk
- Humboldt-Universität zu Berlin, Albrecht Daniel Thaer-Institute for Crop Science, Berlin, Germany
| | - MF Melzig
- Freie Universität Berlin, Institute of Pharmacy, Pharmaceutical Biology, Berlin, Germany
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Huehnchen P, Boehmerle W, Springer A, Freyer D, Endres M. A novel preventive therapy for paclitaxel-induced cognitive deficits: preclinical evidence from C57BL/6 mice. Transl Psychiatry 2017; 7:e1185. [PMID: 28763058 PMCID: PMC5611721 DOI: 10.1038/tp.2017.149] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Revised: 05/18/2017] [Accepted: 06/07/2017] [Indexed: 12/11/2022] Open
Abstract
Chemotherapy-induced central nervous system (CNS) neurotoxicity presents an unmet medical need. Patients often report a cognitive decline in temporal correlation to chemotherapy, particularly for hippocampus-dependent verbal and visuo-spatial abilities. We treated adult C57Bl/6 mice with 12 × 20 mg kg-1 paclitaxel (PTX), mimicking clinical conditions of dose-dense chemotherapy, followed by a pulse of bromodesoxyuridine (BrdU) to label dividing cells. In this model, mice developed visuo-spatial memory impairments, and we measured peak PTX concentrations in the hippocampus of 230 nm l-1, which was sevenfold higher compared with the neocortex. Histologic analysis revealed a reduced hippocampal cell proliferation. In vitro, we observed severe toxicity in slowly proliferating neural stem cells (NSC) as well as human neuronal progenitor cells after 2 h exposure to low nanomolar concentrations of PTX. In comparison, mature post-mitotic hippocampal neurons and cell lines of malignant cells were less vulnerable. In PTX-treated NSC, we observed an increase of intracellular calcium levels, as well as an increased activity of calpain- and caspase 3/7, suggesting a calcium-dependent mechanism. This cell death pathway could be specifically inhibited with lithium, but not glycogen synthase kinase 3 inhibitors, which protected NSC in vitro. In vivo, preemptive treatment of mice with lithium prevented PTX-induced memory deficits and abnormal adult hippocampal neurogenesis. In summary, we identified a molecular pathomechanism, which invokes PTX-induced cytotoxicity in NSC independent of cell cycle status. This pathway could be pharmacologically inhibited with lithium without impairing paclitaxel's tubulin-dependent cytostatic mode of action, enabling a potential translational clinical approach.
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Affiliation(s)
- P Huehnchen
- Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Klinik und Hochschulambulanz für Neurologie, Berlin, Germany,Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Neurocure Cluster of Excellence, Berlin, Germany,Berlin Institute of Health (BIH), Berlin, Germany
| | - W Boehmerle
- Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Klinik und Hochschulambulanz für Neurologie, Berlin, Germany,Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Neurocure Cluster of Excellence, Berlin, Germany,Berlin Institute of Health (BIH), Berlin, Germany,Klinik und Hochschulambulanz für Neurologie, Charité Universitätsmedizin Berlin, Chariteplatz 1, Berlin 10117, Germany. E-mail:
| | - A Springer
- Großgerätezentrum BioSupraMol, Department of Biology, Chemistry and Pharmacy, Institute of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - D Freyer
- Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Klinik und Hochschulambulanz für Neurologie, Berlin, Germany,Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Center for Stroke Research Berlin, Berlin, Germany
| | - M Endres
- Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Klinik und Hochschulambulanz für Neurologie, Berlin, Germany,Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Neurocure Cluster of Excellence, Berlin, Germany,Berlin Institute of Health (BIH), Berlin, Germany,Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Center for Stroke Research Berlin, Berlin, Germany,German Centre for Neurodegenerative Diseases (DZNE), Berlin, Germany,DZHK (German Centre for Cardiovascular Research), partner site Berlin, Berlin, Germany
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Buhr F, Lahroussi A, Springer A, Rustgi S, von Wettstein D, Reinbothe C, Reinbothe S. NADPH:protochlorophyllide oxidoreductase B (PORB) action in Arabidopsis thaliana revisited through transgenic expression of engineered barley PORB mutant proteins. Plant Mol Biol 2017; 94:45-59. [PMID: 28260138 DOI: 10.1007/s11103-017-0592-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 02/09/2017] [Indexed: 06/06/2023]
Abstract
NADPH:protochlorophyllide oxidoreductase (POR) is a key enzyme for the light-induced greening of etiolated angiosperm plants. It belongs to the 'RED' family of reductases, epimerases and dehydrogenases. All POR proteins characterized so far contain evolutionarily conserved cysteine residues implicated in protochlorophyllide (Pchlide)-binding and catalysis. cDNAs were constructed by site-directed mutagenesis that encode PORB mutant proteins with defined Cys→Ala exchanges. These cDNAs were expressed in transgenic plants of a PORB-deficient knock-out mutant (porB) of Arabidopsis thaliana. Results show that porB plants expressing PORB mutant proteins with Ala substitutions of Cys276 or Cys303 are hypersensitive to high-light conditions during greening. Hereby, failure to assemble higher molecular weight complexes of PORB with its twin isoenzyme, PORA, as encountered with (Cys303→Ala)-PORB plants, caused more severe effects than replacing Cys276 by an Ala residue in the active site of the enzyme, as encountered in (Cys276→Ala)-PORB plants. Our results are consistent with the presence of two distinct pigment binding sites in PORB, with Cys276 establishing the active site of the enzyme and Cys303 providing a second, low affinity pigment binding site that is essential for the assembly of higher molecular mass light-harvesting PORB::PORA complexes and photoprotection of etiolated seedlings. Failure to assemble such complexes provoked photodynamic damage through the generation of singlet oxygen. Together, our data highlight the importance of PORB for Pchlide homoeostasis and greening in Arabidopsis.
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Affiliation(s)
- Frank Buhr
- Biologie Environnementale et Systémique (BEeSy), Université Grenoble-Alpes, LBFA, BP53F, 38041, Grenoble cedex 9, France
| | - Abderrahim Lahroussi
- Biologie Environnementale et Systémique (BEeSy), Université Grenoble-Alpes, LBFA, BP53F, 38041, Grenoble cedex 9, France
| | - Armin Springer
- Biologie Environnementale et Systémique (BEeSy), Université Grenoble-Alpes, LBFA, BP53F, 38041, Grenoble cedex 9, France
- Medical Biology and Electron Microscopy Centre, University Medical Center Rostock, Strempelstraße 14, 18057, Rostock, Germany
| | - Sachin Rustgi
- Department of Plant and Environmental Sciences, Clemson University Pee Dee Research and Education Center, Florence, SC, 29506, USA
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164-6420, USA
| | - Diter von Wettstein
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164-6420, USA
| | - Christiane Reinbothe
- Biologie Environnementale et Systémique (BEeSy), Université Grenoble-Alpes, LBFA, BP53F, 38041, Grenoble cedex 9, France
| | - Steffen Reinbothe
- Biologie Environnementale et Systémique (BEeSy), Université Grenoble-Alpes, LBFA, BP53F, 38041, Grenoble cedex 9, France.
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Weil M, Meißner T, Springer A, Bundschuh M, Hübler L, Schulz R, Duis K. Oxidized Carbo-Iron causes reduced reproduction and lower tolerance of juveniles in the amphipod Hyalella azteca. Aquat Toxicol 2016; 181:94-103. [PMID: 27825064 DOI: 10.1016/j.aquatox.2016.10.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 10/26/2016] [Accepted: 10/27/2016] [Indexed: 05/29/2023]
Abstract
For in situ remediation of groundwater contaminated by halogenated hydrocarbons Carbo-Iron®, a composite of microscale activated carbon and nano Fe0, was developed. Against the background of intended release of Carbo-Iron into the environment in concentrations in the g/L-range, potential ecotoxicological consequences were evaluated in the present study. The nano Fei0 in Carbo-Iron acts as reducing agent and is oxidized in aqueous systems by chlorinated solvents, groundwater constituents (e.g. dissolved oxygen) and anaerobic corrosion. As Carbo-Iron is generally oxidized rapidly after application into the environment, the oxidized state is environmentally most relevant, and Carbo-Iron was used in its oxidized form in the ecotoxicological tests. The amphipod Hyalella azteca was selected as a surrogate test species for functionally important groundwater crustaceans. Effects of Carbo-Iron on H. azteca were determined in a 10-d acute test, a 7-d feeding activity test and a 42-d chronic test. Additionally, a 56-d life cycle test was performed with a modified design to further evaluate effects of Carbo-Iron on adult H. azteca and their offspring. The size of Carbo-Iron particles in stock and test suspensions was determined via dynamic light scattering. Potential uptake of particles into test organisms was investigated using transmission and scanning electron microscopy. At the termination of the feeding and acute toxicity test (i.e. after 7 and 10 d of exposure, respectively), Carbo-Iron had a significant effect on the weight, length and feeding rate of H. azteca at the highest test concentration of 100mg/L. While an uptake of Carbo-Iron into the gut was observed, no passage into the surrounding tissue was detected. In both chronic tests, the number of offspring was the most sensitive endpoint and significant effects were recorded at concentrations ≥50mg/L (42-d experiment) and ≥12.5mg/L (56-d experiment). Parental exposure to oxidized Carbo-Iron significantly exacerbated the acute effects of the nanocomposite on the subsequent generation of H. azteca by a factor >10. The present study indicates risks for groundwater species at concentrations in the mg/L range. Carbo-Iron may exceed these effect concentrations in treated aquifers, but the presence of the pollutant has most likely impaired the quality of this habitat already. The benefit of remediation has to be regarded against the risk of ecological consequences with special consideration of the observed increasing sensitivity of juvenile H. azteca.
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Affiliation(s)
- Mirco Weil
- ECT Oekotoxikologie GmbH, Böttgerstrasse 2-14, 65439 Flörsheim, Germany.
| | - Tobias Meißner
- Fraunhofer Institute for Ceramic Technologies and Systems, Winterbergstrasse 28, 01277 Dresden, Germany.
| | - Armin Springer
- Dresden University of Technology, Budapesterstrasse 27, 01069 Dresden, Germany.
| | - Mirco Bundschuh
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden; Institute for Environmental Sciences, University of Koblenz-Landau, Forststrasse 7, 76829 Landau, Germany.
| | - Lydia Hübler
- ECT Oekotoxikologie GmbH, Böttgerstrasse 2-14, 65439 Flörsheim, Germany.
| | - Ralf Schulz
- Institute for Environmental Sciences, University of Koblenz-Landau, Forststrasse 7, 76829 Landau, Germany.
| | - Karen Duis
- ECT Oekotoxikologie GmbH, Böttgerstrasse 2-14, 65439 Flörsheim, Germany.
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Weil M, Meißner T, Busch W, Springer A, Kühnel D, Schulz R, Duis K. The oxidized state of the nanocomposite Carbo-Iron® causes no adverse effects on growth, survival and differential gene expression in zebrafish. Sci Total Environ 2015; 530-531:198-208. [PMID: 26042533 DOI: 10.1016/j.scitotenv.2015.05.087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 05/20/2015] [Accepted: 05/20/2015] [Indexed: 05/24/2023]
Abstract
For degradation of halogenated chemicals in groundwater Carbo-Iron®, a composite of activated carbon and nano-sized Fe(0), was developed (Mackenzie et al., 2012). Potential effects of this nanocomposite on fish were assessed. Beyond the contaminated zone Fe(0) can be expected to have oxidized and Carbo-Iron was used in its oxidized form in ecotoxicological tests. Potential effects of Carbo Iron in zebrafish (Danio rerio) were investigated using a 48 h embryo toxicity test under static conditions, a 96 h acute test with adult fish under semi-static conditions and a 34 d fish early life stage test (FELST) in a flow-through system. Particle diameters in test suspensions were determined via dynamic light scattering (DLS) and ranged from 266 to 497 nm. Particle concentrations were measured weekly in samples from the FELST using a method based on the count rate in DLS. Additionally, uptake of particles into test organisms was investigated using microscopic methods. Furthermore, effects of Carbo-Iron on gene expression were investigated by microarray analysis in zebrafish embryos. In all tests performed, no significant lethal effects were observed. Furthermore, Carbo-Iron had no significant influence on weight and length of fish as determined in the FELST. In the embryo test and the early life stage test, growth of fungi on the chorion was observed at Carbo-Iron concentrations between 6.3 and 25mg/L. Fungal growth did not affect survival, hatching success and growth. In the embryo test, no passage of Carbo-Iron particles into the perivitelline space or the embryo was observed. In juvenile and adult fish, Carbo-Iron was detected in the gut at the end of exposure. In juvenile fish exposed to Carbo-Iron for 29 d and subsequently kept for 5d in control water, Carbo-Iron was no longer detectable in the gut. Global gene expression in zebrafish embryos was not significantly influenced by Carbo-Iron.
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Affiliation(s)
- Mirco Weil
- ECT Oekotoxikologie GmbH, Böttgerstrasse 2-14, 65439 Flörsheim, Germany.
| | - Tobias Meißner
- Fraunhofer Institute for Ceramic Technologies and Systems, Winterbergstrasse 28, 01277 Dresden, Germany.
| | - Wibke Busch
- Helmholtz Centre for Environmental Research - UFZ, Dept. of Bioanalytical Ecotoxicology, Permoser Strasse 15, 04318 Leipzig, Germany.
| | - Armin Springer
- Centre for Translational Bone, Joint and Soft Tissue Research, Technical University Dresden, Fetscherstrasse 74, 01307 Dresden, Germany.
| | - Dana Kühnel
- Helmholtz Centre for Environmental Research - UFZ, Dept. of Bioanalytical Ecotoxicology, Permoser Strasse 15, 04318 Leipzig, Germany.
| | - Ralf Schulz
- Institute for Environmental Sciences, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany.
| | - Karen Duis
- ECT Oekotoxikologie GmbH, Böttgerstrasse 2-14, 65439 Flörsheim, Germany.
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Mobini S, Taghizadeh-Jahed M, Khanmohammadi M, Moshiri A, Naderi MM, Heidari-Vala H, Ashrafi Helan J, Khanjani S, Springer A, Akhondi MM, Kazemnejad S. Comparative evaluation of in vivo biocompatibility and biodegradability of regenerated silk scaffolds reinforced with/without natural silk fibers. J Biomater Appl 2015; 30:793-809. [DOI: 10.1177/0885328215601925] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Nowadays, exceptional advantages of silk fibroin over synthetic and natural polymers have impelled the scientists to application of this biomaterial for tissue engineering purposes. Recently, we showed that embedding natural degummed silk fibers in regenerated Bombyx mori silk-based scaffold significantly increases the mechanical stiffness, while the porosity of the scaffolds remains the same. In the present study, we evaluated degradation rate, biocompatibility and regenerative properties of the regenerated 2% and 4% wt silk-based composite scaffolds with or without embedded natural degummed silk fibers within 90 days in both athymic nude and wild-type C57BL/6 mice through subcutaneous implantation. In all scaffolds, a suitable interconnected porous structure for cell penetration was seen under scanning electron microscopy. Compressive tests revealed a functional relationship between fiber reinforcement and compressive modulus. In addition, the fiber/fibroin composite scaffolds support cell attachment and proliferation. On days 30 to 90 after subcutaneous implantation, the retrieved tissues were examined via gross morphology, histopathology, immunofluorescence staining and reverse transcription-polymerase chain reaction as shown in Figure 1 . Results showed that embedding the silk fibers within the matrix enhances the biodegradability of the matrix resulting in replacement of the composite scaffolds with the fresh connective tissue. Fortification of the composites with degummed fibers not only regulates the degradation profile but also increases the mechanical performance of the scaffolds. This report also confirmed that pore size and structure play an important role in the degradation rate. In conclusion, the findings of the present study narrate key role of additional surface area in improving in vitro and in vivo biological properties of the scaffolds and suggest the potential ability of these fabricated composite scaffolds for connective tissue regeneration. [Figure: see text]
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Affiliation(s)
- Sahba Mobini
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - Masoud Taghizadeh-Jahed
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - Manijeh Khanmohammadi
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - Ali Moshiri
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - Mohammad-Mehdi Naderi
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - Hamed Heidari-Vala
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - Javad Ashrafi Helan
- Department of Pathology, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran
| | - Sayeh Khanjani
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - Armin Springer
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus and Medical Faculty of Technische Universität Dresden, Dresden, Germany
| | - Mohammad-Mehdi Akhondi
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
| | - Somaieh Kazemnejad
- Department of Tissue Engineering, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
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Mkandawire MM, Lakatos M, Springer A, Clemens A, Appelhans D, Krause-Buchholz U, Pompe W, Rödel G, Mkandawire M. Induction of apoptosis in human cancer cells by targeting mitochondria with gold nanoparticles. Nanoscale 2015; 7:10634-10640. [PMID: 26022234 DOI: 10.1039/c5nr01483b] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A major challenge in designing cancer therapies is the induction of cancer cell apoptosis, although activation of intrinsic apoptotic pathways by targeting gold nanoparticles to mitochondria is promising. We report an in vitro procedure targeting mitochondria with conjugated gold nanoparticles and investigating effects on apoptosis induction in the human breast cancer cell line Jimt-1. Gold nanoparticles were conjugated to a variant of turbo green fluorescent protein (mitoTGFP) harbouring an amino-terminal mitochondrial localization signal. Au nanoparticle conjugates were further complexed with cationic maltotriose-modified poly(propylene imine) third generation dendrimers. Fluorescence and transmission electron microscopy revealed that Au nanoparticle conjugates were directed to mitochondria upon transfection, causing partial rupture of the outer mitochondrial membrane, triggering cell death. The ability to target Au nanoparticles into mitochondria of breast cancer cells and induce apoptosis reveals an alternative application of Au nanoparticles in photothermal therapy of cancer.
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Affiliation(s)
- M M Mkandawire
- Encyt Technologies Inc., 201 Churchill Drive, Membertou, NS, Canada B1S OH1.
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Springer A, Acker G, Bartsch S, Bauerschmitt H, Reinbothe S, Reinbothe C. Differences in gene expression between natural and artificially induced leaf senescence in barley. J Plant Physiol 2015; 176:180-91. [PMID: 25637827 DOI: 10.1016/j.jplph.2015.01.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 12/24/2014] [Accepted: 01/02/2015] [Indexed: 05/22/2023]
Abstract
Senescence is the last step of leaf development in the life span of an annual plant. Senescence can be induced prematurely by treating leaf tissues with jasmonic acid methyl ester (methyl jasmonate, MeJA). During both senescence programmes, drastic changes occur at the biochemical, cellular and ultra-structural levels that were compared here for primary leaves of barley (Hordeum vulgare L.). Our findings indicate that both types of senescence are similar with respect to the morphological changes including the loss of chlorophyll, disintegration of thylakoids, and formation of plastoglobules. However, the time elapsed for reaching senescence completion was different and ranged from 7 to 8 days for artificially senescing, MeJA-treated plants to 7-8 weeks for naturally senescing plants. Pulse-labelling studies along with RNA and protein gel blot analyses showed differential changes in the expression of both plastid and nuclear genes coding for photosynthetic proteins. Several unique messenger products accumulated in naturally and artificially senescing, MeJA-treated leaves. Detailed expression and crosslinking studies revealed that pheophorbide a oxygenase (PAO), a previously implicated key enzyme of chlorophyll breakdown, is most likely not rate-limiting for chlorophyll destruction under both senescence conditions. Metabolite profiling identified differential changes in the composition of carotenoid derivatives and prenyl-lipids to occur in naturally senescing and artificially senescing plants that underscored the differences between both senescence programmes.
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Affiliation(s)
- Armin Springer
- Universität Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Georg Acker
- Universität Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Sandra Bartsch
- Universität Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | | | - Steffen Reinbothe
- Université Joseph Fourier, LBFA, BP53, F-38041 Grenoble cedex 9, France.
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Hammer J, Springer A, Track C, Winkler E, Böhm A, Kasparu H, Weltermann A, Altenburger A, Gruber R, Geinitz H. Total Body Irradiation (TBI) by Volumetric Modulated Arc Therapy: First Experiences and Perspectives. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Böhme S, Stärk HJ, Meißner T, Springer A, Reemtsma T, Kühnel D, Busch W. Quantification of Al 2O 3 nanoparticles in human cell lines applying inductively coupled plasma mass spectrometry (neb-ICP-MS, LA-ICP-MS) and flow cytometry-based methods. J Nanopart Res 2014; 16:2592. [PMID: 25285033 PMCID: PMC4176630 DOI: 10.1007/s11051-014-2592-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 07/26/2014] [Indexed: 05/11/2023]
Abstract
In order to quantify and compare the uptake of aluminum oxide nanoparticles of three different sizes into two human cell lines (skin keratinocytes (HaCaT) and lung epithelial cells (A549)), three analytical methods were applied: digestion followed by nebulization inductively coupled plasma mass spectrometry (neb-ICP-MS), direct laser ablation ICP-MS (LA-ICP-MS), and flow cytometry. Light and electron microscopy revealed an accumulation and agglomeration of all particle types within the cell cytoplasm, whereas no particles were detected in the cell nuclei. The internalized Al2O3 particles exerted no toxicity in the two cell lines after 24 h of exposure. The smallest particles with a primary particle size (xBET) of 14 nm (Alu1) showed the lowest sedimentation velocity within the cell culture media, but were calculated to have settled completely after 20 h. Alu2 (xBET = 111 nm) and Alu3 (xBET = 750 nm) were calculated to reach the cell surface after 7 h and 3 min, respectively. The internal concentrations determined with the different methods lay in a comparable range of 2-8 µg Al2O3/cm2 cell layer, indicating the suitability of all methods to quantify the nanoparticle uptake. Nevertheless, particle size limitations of analytical methods using optical devices were demonstrated for LA-ICP-MS and flow cytometry. Furthermore, the consideration and comparison of particle properties as parameters for particle internalization revealed the particle size and the exposure concentration as determining factors for particle uptake.
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Affiliation(s)
- Steffi Böhme
- Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany
| | - Hans-Joachim Stärk
- Department of Analytical Chemistry, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany
| | - Tobias Meißner
- Department of Powder and Suspension Characterization, Fraunhofer Institute for Ceramic Technologies and Systems - IKTS, Winterbergstr. 28, 01277 Dresden, Germany
| | - Armin Springer
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstr. 74, 01307 Dresden, Germany
| | - Thorsten Reemtsma
- Department of Analytical Chemistry, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany
| | - Dana Kühnel
- Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany
| | - Wibke Busch
- Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany
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Springer A, Winkler E, Putz E, Altenburger A, Gruber R, Moser K, Track C, Hammer J, Geinitz H. EP-1546: Dose planning of a total body irradiation with Volumetric Modulated Arc Therapy (VMAT). Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31664-9] [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: 11/28/2022]
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Mendes RG, Koch B, Bachmatiuk A, El-Gendy AA, Krupskaya Y, Springer A, Klingeler R, Schmidt O, Büchner B, Sanchez S, Rümmeli MH. Synthesis and toxicity characterization of carbon coated iron oxide nanoparticles with highly defined size distributions. Biochim Biophys Acta Gen Subj 2013; 1840:160-9. [PMID: 24007898 DOI: 10.1016/j.bbagen.2013.08.025] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2013] [Revised: 08/16/2013] [Accepted: 08/27/2013] [Indexed: 11/17/2022]
Abstract
BACKGROUND Iron oxide nanoparticles hold great promise for future biomedical applications. To this end numerous studies on iron oxide nanoparticles have been conducted. One aspect these studies reveal is that nanoparticle size and shape can trigger different cellular responses through endocytic pathways, cell viability and early apoptosis. However, systematic studies investigating the size dependence of iron oxide nanoparticles with highly defined diameters across multiple cells lines are not available yet. METHODS Iron oxide nanoparticles with well-defined size distributions were prepared. All samples were thoroughly characterized and the cytotoxicity for four standard cell lines (HeLa Kyoto, human osteosarcoma (U2OS), mouse fibroblasts (NIH 3T3) and mouse macrophages (J7442)) where investigated. RESULTS Our findings show that small differences in size distribution (ca. 10nm) of iron oxide nanoparticles do not influence cytotoxicity, while uptake is size dependent. Cytotoxicity is dose-dependent. Broad distributions of nanoparticles are more easily internalized as compared to the narrow distributions for two of the cell lines tested (HeLa Kyoto and mouse macrophages (J7442)). CONCLUSION The data indicate that it is not feasible to probe changes in cytotoxicity within a small size range (10nm). However, TEM investigations of the nanoparticles indicate that cellular uptake is size dependent. GENERAL SIGNIFICANCE The present work compares narrow and broad distributions for various samples of carbon-coated iron oxide nanoparticles. The data highlights that cells differentiate between nanoparticle sizes as indicated by differences in cellular uptake. This information provides valuable knowledge to better understand the interaction of nanoparticles and cells.
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Affiliation(s)
- Rafael Gregorio Mendes
- Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01171 Dresden, Germany
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Kent A, Bahner D, Eiferman D, Boulger C, Springer A, Adkins E, Evans D, Yeager S, Roelant G, Stawicki S. Bedside Sonographic Assessment of Intravascular Volume Status in the Surgical Intensive Care Unit: Is Subclavian Vein Collapsibility Equivalent to Inferior Vena Cava Collapsibility? J Surg Res 2013. [DOI: 10.1016/j.jss.2012.10.526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kühnel D, Scheffler K, Wellner P, Meißner T, Potthoff A, Busch W, Springer A, Schirmer K. Comparative evaluation of particle properties, formation of reactive oxygen species and genotoxic potential of tungsten carbide based nanoparticles in vitro. J Hazard Mater 2012; 227-228:418-26. [PMID: 22698683 DOI: 10.1016/j.jhazmat.2012.04.070] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Revised: 04/27/2012] [Accepted: 04/29/2012] [Indexed: 05/25/2023]
Abstract
Tungsten carbide (WC) and cobalt (Co) are constituents of hard metals and are used for the production of extremely hard tools. Previous studies have identified greater cytotoxic potential of WC-based nanoparticles if particles contained Co. The aim of this study was to investigate whether the formation of reactive oxygen species (ROS) and micronuclei would help explain the impact on cultured mammalian cells by three different tungsten-based nanoparticles (WC(S), WC(L), WC(L)-Co (S: small; L: large)). The selection of particles allowed us to study the influence of particle properties, e.g. surface area, and the presence of Co on the toxicological results. WC(S) and WC(L)/WC(L)-Co differed in their crystalline structure and surface area, whereas WC(S)/WC(L) and WC(L)-Co differed in their cobalt content. WC(L) and WC(L)-Co showed neither a genotoxic potential nor ROS induction. Contrary to that, WC(S) nanoparticles induced the formation of both ROS and micronuclei. CoCl(2) was tested in relevant concentrations and induced no ROS formation, but increased the rate of micronuclei at concentrations exceeding those present in WC(L)-Co. In conclusion, ROS and micronuclei formation could not be associated with the presence of Co in the WC-based particles. The contrasting responses elicited by WC(S) vs. WC(L) appear to be due to large differences in crystalline structure.
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Affiliation(s)
- Dana Kühnel
- Department of Bioanalytical Ecotoxicology, Helmholtz-Centre for Environmental Research Leipzig-UFZ, Leipzig, Germany.
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Springer A, Solem E, Kobistek R. SU-E-I-29: Dose Rate and Image Quality Comparison Between Philips Veradius and GE OEC 9900 Elite Fluoroscopic C-Arms. Med Phys 2012; 39:3631. [PMID: 28519531 DOI: 10.1118/1.4734744] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE The radiation dose rate and image quality were compared on GE OEC 9900 Elite Vas 8 and Philips Veradius fluoroscopic C-arms. METHODS Plastic (PMMA) phantoms were used to simulate various thicknesses of soft tissues encountered during fluoroscopically-guided interventional procedures while aluminum and copper phantoms were used to simulate extremities of different sizes. An image quality test tool and an ionization chamber were included in the setup of each phantom. The phantoms were imaged in several fluoroscopy modes and at different dose levels. The entrance surface air KERMA rate (ESAKR) was measured for each phantom in each fluoroscopy mode. Simultaneously, the image quality was assessed by counting the number of low-contrast objects visible in the image quality test tool. For a given phantom type and thickness, the ESAKR was plotted versus the number of visible low-contrast objects to compare the dose rate required for a given level of image quality. Additionally, the mean ESAKR per number of objects was calculated and p-values were used to test for statistically significant differences between the C-arms. RESULTS For comparable image quality with a given phantom type and thickness the ESAKR with the OEC was typically much higher than with the Veradius. One-tailed, unpaired t-tests confirm that the mean ESAKR per number of visible low-contrast objects was lower for the Veradius than for the OEC with all thicknesses of PMMA (p < 0.05). The differences for the aluminum and copper phantoms were much smaller and were not statistically significant (p-values ranged from 0.2 to 0.47). CONCLUSION In general, the Veradius C-arm provided better low-contrast image quality during fluoroscopy, with lower ESAKR than the OEC 9900 Elite Vas 8. The differences were statistically significant only with PMMA phantoms. Funding support provided by Philips Healthcare (Bothell, WA).
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Affiliation(s)
- A Springer
- National Physics Consultants, Mentor, OH
| | - E Solem
- National Physics Consultants, Mentor, OH
| | - R Kobistek
- National Physics Consultants, Mentor, OH
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