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Javelle F, Bloch W, Borges U, Burberg T, Collins B, Gunasekara N, Hosang TJ, Jacobsen T, Laborde S, Löw A, Schenk A, Schlagheck ML, Schoser D, Vogel A, Walzik D, Zimmer P. Eight weeks of high-intensity interval training versus stretching do not change the psychoneuroendocrine response to a social stress test in emotionally impulsive humans. Eur J Appl Physiol 2024:10.1007/s00421-024-05471-w. [PMID: 38710835 DOI: 10.1007/s00421-024-05471-w] [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: 07/01/2023] [Accepted: 03/19/2024] [Indexed: 05/08/2024]
Abstract
PURPOSE Research supports physical activity as a method to heighten stress resistance and resilience through positive metabolic alterations mostly affecting the neuroendocrine system. High-intensity interval training (HIIT) has been proposed as a highly effective time-saving method to induce those changes. However, existing literature relies heavily on cross-sectional analyses, with few randomised controlled trials highlighting the necessity for more exercise interventions. Thus, this study aims to investigate the effects of HIIT versus an active control group on the stress response to an acute psychosocial stressor in emotionally impulsive humans (suggested as being strong stress responders). METHODS The study protocol was registered online (DRKS00016589) before data collection. Sedentary, emotionally impulsive adults (30.69 ± 8.20 y) were recruited for a supervised intervention of 8 weeks and randomly allocated to either a HIIT (n = 25) or a stretching group (n = 19, acting as active controls). Participants were submitted to a test battery, including saliva samples, questionnaires (self-efficacy- and perceived stress-related), visual analogue scales (physical exercise- and stress-related), and resting electroencephalography and electrocardiography assessing their reaction to an acute psychological stressor (Trier Social Stress Test) before and after the exercise intervention. RESULTS HIIT increased aerobic fitness in all participants, whereas stretching did not. Participants from the HIIT group reported perceiving exercising more intensively than those from the active control group (ƞp2 = 0.108, p = 0.038). No further group differences were detected. Both interventions largely increased levels of joy post-TSST (ƞp2 = 0.209, p = 0.003) whilst decreasing tension (ƞp2 = 0.262, p < 0.001) and worries (ƞp2 = 0.113, p = 0.037). Finally, both interventions largely increased perceived levels of general self-efficacy (ƞp2 = 0.120, p = 0.029). CONCLUSION This study suggests that 8 weeks of HIIT does not change the psychoneuroendocrine response to an acute psychological stress test compared to an active control group in emotionally impulsive humans. Further replications of supervised exercise studies highly powered with active and passive controls are warranted.
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Affiliation(s)
- F Javelle
- Department for Molecular and Cellular Sports Medicine, Institute for Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany.
| | - W Bloch
- Department for Molecular and Cellular Sports Medicine, Institute for Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - U Borges
- Department of Performance Psychology, Institute of Psychology, German Sport University Cologne, Cologne, Germany
- Department of Health and Social Psychology, Institute of Psychology, German Sport University Cologne, Cologne, Germany
| | - T Burberg
- Department of Sport and Exercise Science, University of Salzburg, Salzburg, Austria
| | - B Collins
- Department for Molecular and Cellular Sports Medicine, Institute for Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - N Gunasekara
- Department for Molecular and Cellular Sports Medicine, Institute for Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - T J Hosang
- Experimental Psychology Unit, Faculty of Humanities and Social Sciences, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Hamburg, Germany
| | - T Jacobsen
- Experimental Psychology Unit, Faculty of Humanities and Social Sciences, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Hamburg, Germany
| | - S Laborde
- Department of Performance Psychology, Institute of Psychology, German Sport University Cologne, Cologne, Germany
| | - A Löw
- Experimental Psychology Unit, Faculty of Humanities and Social Sciences, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Hamburg, Germany
| | - A Schenk
- Division of Performance and Health (Sports Medicine), Institute for Sport and Sport Science, Technical University Dortmund, Dortmund, Germany
| | - M L Schlagheck
- Division of Performance and Health (Sports Medicine), Institute for Sport and Sport Science, Technical University Dortmund, Dortmund, Germany
| | - D Schoser
- Institute of Movement Therapy and Movement-Oriented Prevention and Rehabilitation, German Sport University Cologne, Cologne, Germany
| | - A Vogel
- University of Cologne, Cologne, Germany
| | - D Walzik
- Division of Performance and Health (Sports Medicine), Institute for Sport and Sport Science, Technical University Dortmund, Dortmund, Germany
| | - P Zimmer
- Division of Performance and Health (Sports Medicine), Institute for Sport and Sport Science, Technical University Dortmund, Dortmund, Germany
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2
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Oldhafer KJ, Peterhans M, Kantas A, Schenk A, Makridis G, Pelzl S, Wagner KC, Weber S, Stavrou GA, Donati M. [Navigated liver surgery : Current state and importance in the future]. Chirurg 2019; 89:769-776. [PMID: 30225532 DOI: 10.1007/s00104-018-0713-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The preoperative computer-assisted resection planning is the basis for every navigation. Thanks to modern algorithms, the prerequisites have been created to carry out a virtual resection planning and a risk analysis. Thus, individual segment resections can be precisely planned in any conceivable combination. The transfer of planning information and resection suggestions to the operating theater is still problematic. The so-called stereotactic liver navigation supports the exact intraoperative implementation of the planned resection strategy and provides the surgeon with real-time three-dimensional information on resection margins and critical structures during the resection. This is made possible by a surgical navigation system that measures the position of surgical instruments and then presents them together with the preoperative surgical planning data. Although surgical navigation systems have been indispensable in neurosurgery and spinal surgery for many years, these procedures have not yet become established as standard in liver surgery. This is mainly due to the technical challenge of navigating a moving organ. As the liver is constantly moving and deforming during surgery due to respiration and surgical manipulation, the surgical navigation system must be able to measure these alterations in order to adapt the preoperative navigation data to the current situation. Despite these advances, further developments are required until navigated liver resection enters clinical routine; however, it is already clear that laparoscopic liver surgery and robotic surgery will benefit most from navigation technology.
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Affiliation(s)
- K J Oldhafer
- Klinik für Allgemein- und Viszeralchirurgie, Asklepios Klinik Barmbek, Hamburg, Deutschland. .,Semmelweis Universität Budapest, Campus Hamburg, Hamburg, Deutschland.
| | | | - A Kantas
- Klinik für Allgemein- und Viszeralchirurgie, Asklepios Klinik Barmbek, Hamburg, Deutschland.,Semmelweis Universität Budapest, Campus Hamburg, Hamburg, Deutschland
| | - A Schenk
- Fraunhofer-Institut für Bildgestützte Medizin MEVIS, Bremen, Deutschland
| | - G Makridis
- Klinik für Allgemein- und Viszeralchirurgie, Asklepios Klinik Barmbek, Hamburg, Deutschland.,Semmelweis Universität Budapest, Campus Hamburg, Hamburg, Deutschland
| | - S Pelzl
- apoQlar, Hamburg, Deutschland
| | - K C Wagner
- Klinik für Allgemein- und Viszeralchirurgie, Asklepios Klinik Barmbek, Hamburg, Deutschland.,Semmelweis Universität Budapest, Campus Hamburg, Hamburg, Deutschland
| | - S Weber
- University of Bern, ARTORG Center for Biomedical Engineering Research, Bern, Schweiz
| | - G A Stavrou
- Klinik für Allgemein‑, Viszeralchirurgie, Thorax- und Kinderchirurgie, Klinikum Saarbrücken, Saarbrücken, Deutschland
| | - M Donati
- Semmelweis Universität Budapest, Campus Hamburg, Hamburg, Deutschland.,Department of Surgery and Medical Surgical Specialties, University of Catania, Catania, Italien
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3
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Streckmann F, Lehmann HC, Balke M, Schenk A, Oberste M, Heller A, Schürhörster A, Elter T, Bloch W, Baumann FT. Sensorimotor training and whole-body vibration training have the potential to reduce motor and sensory symptoms of chemotherapy-induced peripheral neuropathy-a randomized controlled pilot trial. Support Care Cancer 2018; 27:2471-2478. [PMID: 30382392 DOI: 10.1007/s00520-018-4531-4] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [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: 05/15/2018] [Accepted: 10/23/2018] [Indexed: 01/08/2023]
Abstract
Chemotherapy-induced peripheral neuropathy (CIPN) is a prevalent and clinically relevant side effect of chemotherapy. The symptoms diminish patients' quality of life and represent a decisive limiting factor for medical therapy. To date, effective treatment options are lacking. Specific exercise interventions have proven promising to target relevant symptoms. We conducted a prospective, four-armed, randomized, controlled trial, to evaluate the effects of sensorimotor training (SMT) and whole-body vibration training (WBV) on patients with CIPN. Participants (N = 40) were randomized to either one of two intervention groups (SMT N = 10 or WBV N = 10) or oncological control group (N = 10) and matched by gender and age with a healthy control (N = 10). The intervention groups exercised twice a week for 6 weeks. Primary endpoint was the reduction of CIPN-related symptoms (improve peripheral deep sensitivity, Achilles tendon reflex (ASR) and patellar tendon reflex (PSR), light-touch perception, sense of position, and lower leg strength). Secondary endpoints were nerve conduction velocity and amplitude, balance control, quality of life, and CIPN-related pain. Patients exercising improved sensory and associated motor symptoms. Significant intergroup differences were found for the tendon reflexes (ASR P = .017 and PSR P = .020), peripheral deep sensitivity (P = .010), and pain (P = .043). Furthermore, tendencies were found regarding the subjective improvement of symptoms (P = .075) and two subscales of the EORTC-QLQ-C30 questionnaire: pain (P = .054) and dyspnea (P = .054). The results for the SMT group were superior regarding the tendon reflexes, and a tendency regarding the subjective report of symptoms, while WBV was superior regarding pain. SMT and WBV behold a large potential to reduce CIPN-related symptoms and can be considered feasible and safe for patients with CIPN (compliance 97.5%, no adverse events).Registration: DRKS00013027.
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Affiliation(s)
- Fiona Streckmann
- Institute of Cardiovascular Research and Sport Medicine, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933, Köln, Germany. .,Department of Sport, Exercise and Health, University of Basel, Birsstr. 320B, 4052, Basel, Switzerland. .,Department of Oncology, University Hospital Basel, Petersgraben 4, 4031, Basel, Switzerland.
| | - H C Lehmann
- Department of Neurology, University Hospital Cologne, Cologne, Germany
| | - M Balke
- Department of Neurology, University Hospital Cologne, Cologne, Germany
| | - A Schenk
- Institute of Cardiovascular Research and Sport Medicine, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933, Köln, Germany
| | - M Oberste
- Institute of Cardiovascular Research and Sport Medicine, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933, Köln, Germany
| | - A Heller
- Institute of Cardiovascular Research and Sport Medicine, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933, Köln, Germany
| | - A Schürhörster
- Institute of Cardiovascular Research and Sport Medicine, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933, Köln, Germany
| | - T Elter
- Department of Oncology, Center for Integrated Oncology, University Hospital Cologne, Cologne, Germany
| | - W Bloch
- Institute of Cardiovascular Research and Sport Medicine, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933, Köln, Germany
| | - F T Baumann
- Department of Oncology, Center for Integrated Oncology, University Hospital Cologne, Cologne, Germany
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Schenk A, Siewert B, Toff S, Drewe J. Determination of 34 pyrrolizidine alkaloids (PA) as contaminants in various plant extracts using UHPLC-ToF-HRMS. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608497] [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)
- A Schenk
- Max Zeller Söhne AG dep. of analytical development (1), Romanshorn, Switzerland
| | - B Siewert
- Max Zeller Söhne AG dep. of analytical development (1), Romanshorn, Switzerland
| | - S Toff
- Max Zeller Söhne AG dep. of analytical development (1), Romanshorn, Switzerland
| | - J Drewe
- Max Zeller Söhne AG dep. of preclinical research (2), Romanshorn, Switzerland
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Nägele B, Wüthrich J, Toff S, Schenk A. Simultaneous HPTLC identification of Fig, Senna and P. hybridus using Ion Exchange Chromatography. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608200] [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)
- B Nägele
- Department of Analytical Development, Max Zeller Söhne AG, Romanshorn, Switzerland
| | - J Wüthrich
- Department of Analytical Development, Max Zeller Söhne AG, Romanshorn, Switzerland
| | - S Toff
- Department of Analytical Development, Max Zeller Söhne AG, Romanshorn, Switzerland
| | - A Schenk
- Department of Analytical Development, Max Zeller Söhne AG, Romanshorn, Switzerland
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6
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Schenk A, Ziegler LN, Meier N, Peter S, Wolfram E. Combined determination of sennosides, monomeric hydroxyanthacene glycosides and anthraquinone aglycones by UHPLC-DAD. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608215] [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)
- A Schenk
- Department of Analytical Development, Max Zeller Söhne AG, Romanshorn, Switzerland
| | - LN Ziegler
- Department of Analytical Development, Max Zeller Söhne AG, Romanshorn, Switzerland
| | - N Meier
- Department of Life Sciences of Zurich University of Applied Sciences, Wädenswil, Switzerland
| | - S Peter
- Department of Life Sciences of Zurich University of Applied Sciences, Wädenswil, Switzerland
| | - E Wolfram
- Department of Life Sciences of Zurich University of Applied Sciences, Wädenswil, Switzerland
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7
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Signorello G, Sant S, Bologna N, Schraff M, Drechsler U, Schmid H, Wirths S, Rossell MD, Schenk A, Riel H. Manipulating Surface States of III-V Nanowires with Uniaxial Stress. Nano Lett 2017; 17:2816-2824. [PMID: 28383924 DOI: 10.1021/acs.nanolett.6b05098] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
III-V compound semiconductors are indispensable materials for today's high-end electronic and optoelectronic devices and are being explored for next-generation transistor logic and quantum technologies. III-V surfaces and interfaces play the leading role in determining device performance, and therefore, methods to control their electronic properties have been developed. Typically, surface passivation studies demonstrated how to limit the density of surface states. Strain has been widely used to improve the electronic transport properties and optoelectronic properties of III-Vs, but the potential of this technology to modify the surface properties still remains to be explored. Here we show that uniaxial stress induces a shift in the energy of the surface states of III-V nanowires, modifying their electronic properties. We demonstrate this phenomenon by modulating the conductivity of InAs nanowires over 4 orders of magnitude with axial strain ranging between -2.5% in compression and 2.1% in tension. The band bending at the surface of the nanostructure is modified from accumulation to depletion reversibly and reproducibly. We provide evidence of this physical effect using a combination of electrical transport measurement, Raman spectroscopy, band-structure modeling, and technology computer aided design (TCAD) simulations. With this methodology, the deformation potentials for the surface states are quantified. These results reveal that strain technology can be used to shift surface states away from energy ranges in which device performance is negatively affected and represent a novel route to engineer the electronic properties of III-V devices.
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Affiliation(s)
- G Signorello
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - S Sant
- Integrated Systems Laboratory, Department of Electrical Engineering and Information Technology, ETH Zürich , 8092 Zürich, Switzerland
| | - N Bologna
- Electron Microscopy Center, EMPA, Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf, Switzerland
| | - M Schraff
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - U Drechsler
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - H Schmid
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - S Wirths
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - M D Rossell
- Electron Microscopy Center, EMPA, Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf, Switzerland
| | - A Schenk
- Integrated Systems Laboratory, Department of Electrical Engineering and Information Technology, ETH Zürich , 8092 Zürich, Switzerland
| | - H Riel
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
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8
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Schenk A. [Unambiguous prescriptions prevent misunderstandings]. Hautarzt 2016; 67:1025-1026. [PMID: 27785523 DOI: 10.1007/s00105-016-3887-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- A Schenk
- Avoxa Mediengruppe, Carl-Mannich-Str. 26, 65760, Eschborn, Deutschland.
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Heiling B, Hammer N, Stubendorff B, Grimm A, Ringer T, Prell T, Gunkel A, Schenk A, Axer H, Witte O, Grosskreutz J. EP 15. Muscle ultrasound imaging increases diagnostic sensitivity and aids prognosis in amyotrophic lateral sclerosis. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2016.05.069] [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: 11/24/2022]
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10
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Schenk A, Günther A, Prell T, Ringer T, Gunkel A, Stubendorff B, Witte O, Grosskreutz J. EPV 6. Value of transcranial brain stem sonography in the diagnosis and prognosis of amyotrophic lateral sclerosis. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2016.05.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Schenk A, Porter AL, Alenciks E, Frazier K, Best AA, Fraley SM, Fraley GS. Increased water contamination and grow-out Pekin duck mortality when raised with water troughs compared to pin-metered water lines using a United States management system. Poult Sci 2016; 95:736-48. [PMID: 26769272 PMCID: PMC4957366 DOI: 10.3382/ps/pev381] [Citation(s) in RCA: 8] [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: 06/29/2015] [Accepted: 11/18/2015] [Indexed: 02/01/2023] Open
Abstract
Controversy has developed as to whether or not pin-metered water lines or water troughs are more appropriate for Pekin ducks. We hypothesized that water troughs would show improved duck body conditions and environmental quality compared to pin-metered water lines. To test this hypothesis, we housed ducks in 2 barns, one with water lines and one with water troughs. Water troughs were constructed to meet RSPCA guidelines for number and density of ducks and with recently described verandas. Ducks were divided into 4 pens per barn (n=1,000 ducks/pen). The study was then repeated (n=8 pens per water source) in a cross-over design so the barns each contained the opposite water source to the first experiment. We scored the ducks' body condition using an established scoring rubric and analyzed using SAS Proc GLM-Mix as binomial data. Ducks housed with water troughs showed higher (thus worse condition; P<0.001) scores for eyes, nostrils, feather quality, feather cleanliness, and foot pads. We also compared water condition, water quality, and duck mortality using a Student t test for both water sources each week. We found that the water troughs showed higher iron (P<0.001), nitrites (P<0.001), pH (P<0.01), and bacterial growth (P<0.001). The bacterial growth was shown to have higher (P<0.001)E. coli, coliforms, and Staphylococcusin the water troughs. Water lines typically showed no bacterial growth in culture-based assays. Ducks housed with water troughs used greater (P=0.001) volumes of water compared to ducks housed with water lines. Ducks with water troughs also showed a greater percent (P=0.008) mortality at all ages compared to ducks with water lines. These data suggest that water troughs may not be beneficial for duck welfare and could adversely impact both environment and duck or human health.
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Affiliation(s)
- A Schenk
- Biology Department, Hope College, Holland, MI USA
| | - A L Porter
- Biology Department, Hope College, Holland, MI USA
| | - E Alenciks
- Biology Department, Hope College, Holland, MI USA
| | - K Frazier
- Biology Department, Hope College, Holland, MI USA
| | - A A Best
- Biology Department, Hope College, Holland, MI USA
| | - S M Fraley
- Biology Department, Hope College, Holland, MI USA South Crossing Veterinary Center, Caledonia, MI USA
| | - G S Fraley
- Biology Department, Hope College, Holland, MI USA
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Campbell C, Colton S, Haas R, Rice M, Porter A, Schenk A, Meelker A, Fraley S, Fraley G. Effects of different wavelengths of light on the biology, behavior, and production of grow-out Pekin ducks. Poult Sci 2015; 94:1751-7. [DOI: 10.3382/ps/pev166] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/07/2015] [Indexed: 11/20/2022] Open
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13
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Zimmer P, Bloch W, Schenk A, Zopf EM, Hildebrandt U, Streckmann F, Beulertz J, Koliamitra C, Schollmayer F, Baumann F. Exercise-induced Natural Killer Cell Activation is Driven by Epigenetic Modifications. Int J Sports Med 2015; 36:510-5. [PMID: 25714571 DOI: 10.1055/s-0034-1398531] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Exercise has been proven to reduce the risk and progression of various diseases, such as cancer, diabetes and neurodegenerative disorders. Increasing evidence suggests that exercise affects the cytokine profile and changes distribution and function of tumor-competitive immune cells. Initial studies have shown that different exercise interventions are associated with epigenetic modifications in different tissues and cell types, such as muscle, fat, brain and blood. The present investigation examines the effect of an intense endurance run (half marathon) on global epigenetic modifications in natural killer (NK) cells in 14 cancer patients compared to 14 healthy controls. We were able to show that histone acetylation and NKG2D expression, a functional NK cell marker, were elevated for at least 24 h after the run. Thus, this is the first study to present a potential mechanism of how exercise may impact NK cell activity on the subcellular level. Further studies should focus on epigenetic mechanisms and dose-dependent effects of exercise.
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Affiliation(s)
- P Zimmer
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - W Bloch
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - A Schenk
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - E M Zopf
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - U Hildebrandt
- Department of Preventive and Rehabilitative Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, German Sport University Cologne, Cologne, Germany
| | - F Streckmann
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - J Beulertz
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - C Koliamitra
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - F Schollmayer
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - F Baumann
- Department of Molecular and Cellular Sport Medicine, Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
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14
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Rietwyk KJ, Smets Y, Bashouti M, Christiansen SH, Schenk A, Tadich A, Edmonds MT, Ristein J, Ley L, Pakes CI. Charge transfer doping of silicon. Phys Rev Lett 2014; 112:155502. [PMID: 24785050 DOI: 10.1103/physrevlett.112.155502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Indexed: 06/03/2023]
Abstract
We demonstrate a novel doping mechanism of silicon, namely n-type transfer doping by adsorbed organic cobaltocene (CoCp2*) molecules. The amount of transferred charge as a function of coverage is monitored by following the ensuing band bending via surface sensitive core-level photoelectron spectroscopy. The concomitant loss of electrons in the CoCp2* adlayer is quantified by the relative intensities of chemically shifted Co2p components in core-level photoelectron spectroscopy which correspond to charged and neutral molecules. Using a previously developed model for transfer doping, the evolution in relative intensities of the two components as a function of coverage has been reproduced successfully. A single, molecule-specific parameter, the negative donor energy of -(0.50±0.15) eV suffices to describe the self-limiting doping process with a maximum areal density of transferred electrons of 2×1013 cm-2 in agreement with the measured downward band bending. The advantage of this doping mechanism over conventional doping for nanostructures is addressed.
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Affiliation(s)
- K J Rietwyk
- Department of Physics, La Trobe University, Victoria 3086, Australia
| | - Y Smets
- Department of Physics, La Trobe University, Victoria 3086, Australia
| | - M Bashouti
- Max-Planck-Institute for the Science of Light, D-91058 Erlangen, Germany and Institute of Nanoarchitectures for solar energy conversion, Helmholtz-Centre Berlin (HZB), D-14109 Berlin, Germany
| | - S H Christiansen
- Institute of Nanoarchitectures for solar energy conversion, Helmholtz-Centre Berlin (HZB), D-14109 Berlin, Germany
| | - A Schenk
- Department of Physics, La Trobe University, Victoria 3086, Australia
| | - A Tadich
- Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - M T Edmonds
- School of Physics, Monash University, Clayton, Victoria 3800, Australia
| | - J Ristein
- Technische Physik, Universität Erlangen, D-91058 Erlangen, Germany
| | - L Ley
- Department of Physics, La Trobe University, Victoria 3086, Australia and Technische Physik, Universität Erlangen, D-91058 Erlangen, Germany
| | - C I Pakes
- Department of Physics, La Trobe University, Victoria 3086, Australia
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Edmonds MT, Wanke M, Tadich A, Vulling HM, Rietwyk KJ, Sharp PL, Stark CB, Smets Y, Schenk A, Wu QH, Ley L, Pakes CI. Surface transfer doping of hydrogen-terminated diamond by C60F48: Energy level scheme and doping efficiency. J Chem Phys 2012; 136:124701. [DOI: 10.1063/1.3695643] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Delele M, Vorstermans B, Creemers P, Tsige A, Tijskens E, Schenk A, Opara U, Nicolaï B, Verboven P. CFD model development and validation of a thermonebulisation fungicide fogging system for postharvest storage of fruit. J FOOD ENG 2012. [DOI: 10.1016/j.jfoodeng.2011.07.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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17
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Müssig E, Schenk A, Lux CJ, Brunner M. Mundgesundheitsspezifische Belastung bei Eltern von Kindern mit orofazialen Spaltbildungen: ein Indikator für allgemeine elterliche Belastung. Gesundheitswesen 2010; 72:714-21. [DOI: 10.1055/s-0029-1231079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Stufkens DJ, Schenk A. Dynamic Jahn-Teller effect in the excited state of TeCl62−. √T dependence of the splitting of the C absorption band. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19710900208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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19
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Radtke A, Sgourakis G, Sotiropoulos G, Beckebaum S, Molmenti E, Saner F, Schroeder T, Nadalin S, Schenk A, Lang H, Malagó M, Broelsch C. Donor/recipient algorithm for management of the middle hepatic vein in right graft live donor liver transplantation. Am J Surg 2010; 199:708-15. [DOI: 10.1016/j.amjsurg.2009.03.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2009] [Revised: 03/06/2009] [Accepted: 03/06/2009] [Indexed: 10/19/2022]
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20
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Frericks B, Lehmann K, Ritz JP, Valdeig S, Knappe V, Schenk A, Peitgen HO, Wolf KJ. Ex-vivo Evaluierung eines Planungssystems zur Berechnung von RF-Ablationszonen in der Leber unter Berücksichtigung von Kühleffekten durch intrahepatische Gefäße. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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21
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Kröger T, Pätz T, Altrogge I, Schenk A, Lehmann K, Frericks B, Ritz JP, Peitgen HO, Preusser T. Fast Estimation of the Vascular Cooling in RFA Based on Numerical Simulation. Open Biomed Eng J 2010. [DOI: 10.2174/1874120701004010016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We present a novel technique to predict the outcome of an RF ablation, including the vascular cooling effect. The main idea is to separate the problem into a patient independent part, which has to be performed only once for every applicator model and generator setting, and a patient dependent part, which can be performed very fast. The patient independent part fills a look-up table of the cooling effects of blood vessels, depending on the vessel radius and the distance of the RF applicator from the vessel, using a numerical simulation of the ablation process. The patient dependent part, on the other hand, only consists of a number of table look-up processes. The paper presents this main idea, along with the required steps for its implementation. First results of the computation and the related ex-vivo evaluation are presented and discussed. The paper concludes with future extensions and improvements of the approach.
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Kröger T, Pätz T, Altrogge I, Schenk A, Lehmann KS, Frericks BB, Ritz JP, Peitgen HO, Preusser T. Fast Estimation of the Vascular Cooling in RFA Based on Numerical Simulation. Open Biomed Eng J 2010; 4:16-26. [PMID: 20448794 PMCID: PMC2852120 DOI: 10.2174/1874120701004020016] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Revised: 11/22/2009] [Accepted: 12/28/2009] [Indexed: 02/04/2023] Open
Abstract
We present a novel technique to predict the outcome of an RF ablation, including the vascular cooling effect. The main idea is to separate the problem into a patient independent part, which has to be performed only once for every applicator model and generator setting, and a patient dependent part, which can be performed very fast. The patient independent part fills a look-up table of the cooling effects of blood vessels, depending on the vessel radius and the distance of the RF applicator from the vessel, using a numerical simulation of the ablation process. The patient dependent part, on the other hand, only consists of a number of table look-up processes. The paper presents this main idea, along with the required steps for its implementation. First results of the computation and the related ex-vivo evaluation are presented and discussed. The paper concludes with future extensions and improvements of the approach.
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Affiliation(s)
- T Kröger
- Fraunhofer MEVIS, Institute for Medical Image Computing, Bremen, Germany
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23
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Schenk A, Hindennach M, Radtke A, Malagó M, Schroeder T, Peitgen HO. Formation of venous collaterals and regeneration in the donor remnant liver: volumetric analysis and three-dimensional visualization. Transplant Proc 2010; 41:2515-7. [PMID: 19715965 DOI: 10.1016/j.transproceed.2009.06.110] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
PURPOSE We sought was to quantify and visualize the regeneration of the remnant liver after living donor liver transplantation using computed tomographic (CT) data. METHODS For the evaluation of preoperative and follow-up data, we developed a software assistant that was able to compute the volume growth of the remnant liver and liver territories as well as visualize the individual growth of hepatic vessels over time. The software was applied to CT data of 20 donors who underwent right hepatectomy including the middle hepatic vein with at least 3 follow-up examinations in the first year after transplantation. RESULTS After donation of a right lobe graft, the remnant liver regenerated by an average 77% of the original volume within the first 3 postoperative months and to 86% within the first year. The growth of the left lateral segments was increased compared with that of segment IV in all cases. The visualization showed the growth of the portal vein and the hepatic veins. With the simultaneous display of pre- and postoperative results, it was possible to detect the formation of collaterals between truncated segment IVb veins and the veins of segment IVa or of the left lateral lobe. CONCLUSION The software-assisted analysis of follow-up data yielded additional insight into territorial liver regeneration after living donor liver transplantation and allowed for reliable detection of relevant hepatic vein collaterals using CT data.
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Affiliation(s)
- A Schenk
- Fraunhofer MEVIS, Institute for Medical Image Computing, Bremen, Germany.
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Delele M, Schenk A, Ramon H, Nicolaï B, Verboven P. Evaluation of a chicory root cold store humidification system using computational fluid dynamics. J FOOD ENG 2009. [DOI: 10.1016/j.jfoodeng.2009.03.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Radtke A, Sgourakis G, Sotiropoulos GC, Molmenti EP, Nadalin S, Fouzas I, Schroeder T, Saner FH, Schenk A, Cicinnati VR, Malagó M, Lang H. Hepatic hilar and sectorial vascular and biliary anatomy in right graft adult live liver donor transplantation. Transplant Proc 2009; 40:3147-50. [PMID: 19010218 DOI: 10.1016/j.transproceed.2008.08.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
INTRODUCTION The aim of this study was to analyze vascular and biliary variants at the hilar and sectorial level in right graft adult living donor liver transplantation. METHODS From January 2003 to June 2007, 139 consecutive live liver donors underwent three-dimensional computed tomography (3-D CT) reconstructions and virtual 3-D liver partitioning. We evaluated the portal (PV), arterial (HA), and biliary (BD) anatomy. RESULTS The hilar and sectorial biliary/vascular anatomy was predominantly normal (70%-85% and 67%-78%, respectively). BD and HA showed an equal incidence (30%) of hilar anomalies. BD and PV had a nearly identical incidence of sectorial abnormalities (64.7% and 66.2%, respectively). The most frequent "single" anomaly was seen centrally in HA (21%) and distally in BD (18%). A "double" anomaly involved BD/HA (7.2%) in the hilum, and HA/PV and BD/PV (6.5% each) sectorially. A "triple" anomaly involving all systems was found at the hilum in 1.4% of cases, and at the sectorial level in 9.4% of instances. Simultanous central and distal abnormalities were rare. In this study, 13.7% of all donor candidates showed normal hilar and sectorial anatomy involving all 3 systems. A simultaneous central and distal "triple" abnormality was not encountered. A combination of "triple" hilar anomaly with "triple" sectorial normality was observed in 2 cases (1.4%). A central "triple" normality associated with a distal "triple" abnormality occurred in 7 livers (5%). CONCLUSIONS Our data showed a variety of "horizontal" (hilar or sectorial) and "vertical" (hilar and sectorial) vascular and biliary branching patterns, providing comprehensive assistance for surgical decision-making prior to right graft hepatectomy.
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Affiliation(s)
- A Radtke
- Department of General and Abdominal Surgery, Johannes Gutenberg University Hospital, Mainz, Germany; Department of General, Visceral, and Transplantation Surgery, University Hospital Essen, Essen, Germany
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26
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Delele M, Schenk A, Tijskens E, Ramon H, Nicolaï B, Verboven P. Optimization of the humidification of cold stores by pressurized water atomizers based on a multiscale CFD model. J FOOD ENG 2009. [DOI: 10.1016/j.jfoodeng.2008.08.027] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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27
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Ketelsen D, Heuschmid M, Schenk A, Nadalin S, Horger M. [CT cholangiography--potential applications and image findings]. ROFO-FORTSCHR RONTG 2008; 180:1031-4. [PMID: 19051161 DOI: 10.1055/s-0028-1098067] [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: 10/21/2022]
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28
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Radtke A, Sgourakis G, Sotiropoulos GC, Molmenti EP, Nadalin S, Fouzas I, Schroeder T, Saner F, Schenk A, Cincinnati VR, Malagó M, Lang H. Intrahepatic biliary anatomy derived from right graft adult live donor liver transplantation. Transplant Proc 2008; 40:3151-4. [PMID: 19010219 DOI: 10.1016/j.transproceed.2008.08.048] [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: 11/29/2022]
Abstract
OBJECTIVE The successful management of the bile duct in right graft adult live donor liver transplantation requires knowledge of both its central (hilar) and distal (sectorial) anatomy. The purpose of this study was to provide a systematic classification of its branching patterns to enhance clinical decision-making. PATIENTS AND METHODS We analyzed three-dimensional computed tomography (3-D CT) imaging reconstructions of 139 potential live liver donors evaluated at our institution between January 2003 and June 2007. RESULTS Fifty-four (n = 54 or 38.8%) donor candidates had a normal (classic) hilar and sectorial right bile duct anatomy (type I). Seventy-eight (n = 78 or 56.1%) cases had either hilar or sectorial branching abnormalities (types II or III). Seven (n = 7 or 5.1%) livers had a mixed type (IV) of a rare and complex central and distal anatomy. CONCLUSIONS We believe that the classification proposed herein can aid in the better organization and categorization of the variants encountered within the right-sided intrahepatic biliary system.
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Affiliation(s)
- A Radtke
- Department of General and Abdominal Surgery, Johannes Gutenberg University Hospital, Mainz, Germany; Department of General, Visceral, and Transplantation Surgery, University Hospital Essen, Essen, Germany
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29
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Dahmen U, Radtke A, Schröder T, Chi H, Madrahimov N, Lu M, Schenk A, Peitgen KH, Dirsch O. Median liver lobe of woodchuck as a model to study hepatic outflow obstruction: a pilot study. Liver Int 2008; 28:1236-44. [PMID: 18544125 DOI: 10.1111/j.1478-3231.2008.01797.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
BACKGROUND Hepatic vein outflow obstruction represents an important clinical problem in living-liver transplantation. An animal model is required to study the influence of outflow obstruction on the intrahepatic regulation of liver perfusion and the subsequent effects on liver injury and recovery during liver regeneration. The size of woodchucks enables the use of standard clinical imaging procedures. AIM This study aims at describing hepatic vascular and territorial anatomy of the woodchuck liver based on a virtual three-dimensional (3D) visualization of the hepatic vascular tree. METHODS Woodchucks (n=6) were subjected to an all-in-one computed tomography (CT) after contrasting the vascular and the biliary tree. CT-images were used for 3D-reconstruction of hepatic and portal veins and calculation of the corresponding portal and hepatic vein territories and their respective volume using hepavision (MeVisLab). A virtual resection was performed following the Cantlie-line and territories at risk were calculated. RESULTS The median lobe of the woodchuck liver has a similar vascular supply and drainage as the human liver with two portal (right and left median portal vein) and three hepatic veins (left, middle and right median hepatic vein). The corresponding portal and hepatic vein subterritories are of a similar relative size compared with the human liver. Virtual splitting of the median lobe of the woodchuck liver revealed areas at risk of focal outflow obstruction, as observed clinically. CONCLUSION The median liver lobe of the woodchuck represents, to a small extent, the hepatic vascular anatomy of the human liver and is therefore a suitable potential model to correlate repeated imaging of impaired liver perfusion with histomorphological findings of liver damage and regeneration.
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Affiliation(s)
- Uta Dahmen
- Department of General, Visceral and Transplantation Surgery, University Hospital of Essen, Essen, Germany.
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Radtke A, Sgourakis G, Sotiropoulos G, Molmenti E, Nadalin S, Fouzas I, Schroeder T, Saner F, Cicinnati V, Schenk A, Malagó M, Lang H. A New Systematic Classification of Peripheral Anatomy of the Right Hepatic Duct: Experience From Adult Live Liver Donor Transplantation. Transplant Proc 2008; 40:3158-60. [DOI: 10.1016/j.transproceed.2008.08.049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
Donor-reactive memory T cells undermine the survival of transplanted organs through multiple pathways. We have previously reported that memory CD4 T cells resist treatment with anti-CD154 antibody and donor-specific transfusion (DST/MR1) and promote cardiac allograft rejection via generation of effector CD4 T cells and alloantibody. We hypothesized that the helper functions of memory CD4 T cells are independent of T-cell costimulation through CD154 but instead are regulated by alternative costimulatory pathways. This study investigated how blocking ICOS/B7RP-1 interactions affects functions of donor-reactive memory CD4 T cells. Treatment with blocking anti-ICOS mAb synergized with DST/MR1 and prolonged mouse cardiac allograft survival despite the presence of donor-reactive memory CD4 T cells. While blocking ICOS did not diminish the expansion of preexisting memory CD4 T cells or the induction of allospecific effector T cells, it did inhibit recruitment of the activated memory and effector T cells into the graft. In addition, anti-ICOS mAb treatment in combination with DST/MR1 prevented help provided by memory CD4 T cells for production of donor-specific IgG antibody. These results demonstrate the potential efficacy of ICOS blockade in sensitized transplant patients and provide the foundation for rational use of ICOS blockade in combination with other graft-prolonging strategies.
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Affiliation(s)
- Q-W Zhang
- Department of Immunology, the Cleveland Clinic Foundation, Cleveland, OH, USA
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Hansen C, Bieberstein J, Schumann C, Rieder C, Schenk A, Zidowitz S, Weihusen A, Peitgen HO. Fusion von Planungsdaten mit interventionellen Bilddaten zur Navigationsunterstützung bei Leberinterventionen. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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33
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Frericks BB, Ritz JP, Vadleig S, Hoffmann P, Schenk A, Weihusen A, Wolf KJ, Lehmann KS. Systematische Analyse von Kühleffekten intrahepatischer Gefäße auf Thermoablationen in einem ex-vivo Schweinelebermodell. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lang H, Radtke A, Hindennach M, Schroeder T, Bourquain H, Schenk A, Oldhafer KJ, Prause G, Peitgen HO, Broelsch CE. Virtuelle hepatobiliäre Chirurgie - computerunterstützte Resektionsplanung an der dreidimensional rekonstruierten Leber. Z Gastroenterol 2007; 45:965-70. [PMID: 17786872 DOI: 10.1055/s-2007-963210] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Recent developments in image-based computer assistance provide an improved visualisation of the intrahepatic vascular branching system in a virtual three-dimensional model of the liver, allowing a quantitative assessment of any vascular territory. The advantages of computer-assisted resection planning refer to a better preoperative assessment of functional resectability in areas at risk for either devascularisation or impaired drainage. In selected cases, this information may have a considerable influence on operative planning, especially with regard to the extent of resection or the need for vascular reconstruction. Due to the great anatomical variability of the intrahepatic branching patterns of the right liver lobe, this seems to be particularly important in extended left hepatectomies or in repeat hepatectomy when intrahepatic vascular anatomy may be altered. The development of navigation techniques to ensure the accurate application of the preoperative planned resection line is under investigation but not available yet.
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Affiliation(s)
- H Lang
- Klinik für Allgemein-, Viszeral- und Transplantationschirurgie, Universitätsklinikum Essen.
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Schenk A. Läsionsgröße, PDT und klassische CNV. Spektrum Augenheilkd 2007. [DOI: 10.1007/s00717-007-0207-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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36
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Radtke A, Sotiropoulos GC, Nadalin S, Molmenti EP, Schroeder T, Lang H, Saner F, Valentin-Gamazo C, Frilling A, Schenk A, Broelsch CE, Malagó M. Preoperative volume prediction in adult living donor liver transplantation: how much can we rely on it? Am J Transplant 2007; 7:672-9. [PMID: 17229068 DOI: 10.1111/j.1600-6143.2006.01656.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Accurate preoperative prediction of functional donor and remnant hemiliver volumes in live donor liver transplantation is essential in preventing postoperative liver failure and optimizing safety. Our aim was (1) to evaluate volume variability associated with multiphasic CT imaging and (2) to determine over- or under-estimations of 3-D CT graft-volume assessments based on 'largest' versus 'smallest' CT phases with respect to intraoperative findings. Native, arterial and venous phase CT images from 83 potential live liver donors were subject to 3-D CT liver volume calculations and virtual 3-D liver partitioning. Estimates were compared to intraoperative volumes obtained in 43 cases. Calculated (preoperative) graft-volume-body-weight-ratios (GVBWR) versus measured (intraoperative) graft-weight-body-weight-ratios (GWBWR) were analyzed. Significant differences in total liver volume- and in graft-liver volume calculations were found among the largest (venous) and smallest (native) CT phases. High significant overestimations were observed in graft-volume determinations and in GVBWR-calculations based on the 'largest' CT phase when compared to intraoperatively obtained graft-weight and -GWBWR values. In contrast, differences among intraoperative measurements and preoperative calculations based on the 'smallest' CT phase yielded less significant overestimations. While 3-D CT volumetry based on the 'largest' (venous) CT phase is associated with considerable overestimation, 3-D volumetry based on the 'smallest' (native) CT phase accurately matches the intraoperative findings.
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Affiliation(s)
- A Radtke
- Departments of General, Visceral and Transplantation Surgery, University Hospital Essen, Essen, Germany
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Radtke A, Sotiropoulos GC, Nadalin S, Molmenti EP, Schroeder T, Lang H, Saner F, Valentin-Gamazo C, Frilling A, Schenk A, Broelsch CE, Malagó M. Preoperative volume prediction in adult living donor liver transplantation: how much can we rely on it? Am J Transplant 2007; 7:672-679. [PMID: 17229068 DOI: 10.1111/j.1600-6143.2006.01656] [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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Accurate preoperative prediction of functional donor and remnant hemiliver volumes in live donor liver transplantation is essential in preventing postoperative liver failure and optimizing safety. Our aim was (1) to evaluate volume variability associated with multiphasic CT imaging and (2) to determine over- or under-estimations of 3-D CT graft-volume assessments based on 'largest' versus 'smallest' CT phases with respect to intraoperative findings. Native, arterial and venous phase CT images from 83 potential live liver donors were subject to 3-D CT liver volume calculations and virtual 3-D liver partitioning. Estimates were compared to intraoperative volumes obtained in 43 cases. Calculated (preoperative) graft-volume-body-weight-ratios (GVBWR) versus measured (intraoperative) graft-weight-body-weight-ratios (GWBWR) were analyzed. Significant differences in total liver volume- and in graft-liver volume calculations were found among the largest (venous) and smallest (native) CT phases. High significant overestimations were observed in graft-volume determinations and in GVBWR-calculations based on the 'largest' CT phase when compared to intraoperatively obtained graft-weight and -GWBWR values. In contrast, differences among intraoperative measurements and preoperative calculations based on the 'smallest' CT phase yielded less significant overestimations. While 3-D CT volumetry based on the 'largest' (venous) CT phase is associated with considerable overestimation, 3-D volumetry based on the 'smallest' (native) CT phase accurately matches the intraoperative findings.
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Affiliation(s)
- A Radtke
- Departments of General, Visceral and Transplantation Surgery, University Hospital Essen, Essen, Germany
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Zidowitz S, Ritter F, Weihusen A, Bourquain H, Hindenach M, Schenk A, Peitgen HO. Integrierte Softwareunterstützung für die bildbasierte Planung und Eingriffsunterstützung in der Therapie von Lebertumoren. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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39
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Stein R, Schroeder A, Schenk A, Wiesner C, Faldum A, Thueroff J. MP-07.07. Urology 2006. [DOI: 10.1016/j.urology.2006.08.295] [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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40
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Stein R, Schroeder A, Schenk A, Thueroff J. MP-07.06. Urology 2006. [DOI: 10.1016/j.urology.2006.08.294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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41
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Nicolaï B, Beullens K, Bobelyn E, Hertog M, Schenk A, Vermeir S, Lammertyn J. SYSTEMS TO CHARACTERISE INTERNAL QUALITY OF FRUIT AND VEGETABLES. ACTA ACUST UNITED AC 2006. [DOI: 10.17660/actahortic.2006.712.4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Radtke A, Schroeder T, Molmenti EP, Sotiropoulos GC, Nadalin S, Schenk A, Malamutmann E, Saner F, Valentin-Gamazo C, Dahmen U, Lang H, Peitgen HO, Broelsch CE, Malagò M. The "territorial belonging" of the middle hepatic vein: a troublesome dilemma in adult live donor liver transplantation--anatomical evidence based on virtual 3-dimensional-computed tomography-imaging reconstructions. Eur J Med Res 2006; 11:66-72. [PMID: 16504963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023] Open
Abstract
BACKGROUND The venous drainage of the liver plays an essential role in securing viability of both graft and remnant in live donor liver transplantation (LDLT). There is still controversy on whether the middle hepatic vein (MHV) should be routinely included as part of the graft or retained with the remnant liver. The purpose of this study was to analyze hepatic venous drainage patterns based on information obtained by 3-dimensional CT-imaging reconstructions. METHODOLOGY Fifty five potential live liver donors were evaluated between January 2003 and May 2004 at our Institution. We analyzed two anatomical definitions of liver dominance: total liver dominance (TLD) and hemiliver dominance (HLD). The following concepts were addressed: 1) Hepatic vein territories, 2) Hepatic vein dominance relationship, 3) Territorial belonging- patterns of the MHV to the right and left hemilivers, additionally an analysis of venous outflow in the central liver sectors was performed. RESULTS Our results showed that: 1) The definitions of dominance: TLD vs. HLD overlap, displaying the MHV belonging, by taking into account the individual right hepatic vein (RHV) variability; 2) A dominant RHV for the whole liver indicates that the RHV is also dominant in the right hemiliver; 3) The MHV belongs predominantly to the left hemiliver (LHL); 4) The left hepatic vein (LHV) is dominant in the LHL. CONCLUSION Both dominance definitions provide independent mappings of the liver and offer helpful insight into venous dominance relationship.
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Affiliation(s)
- A Radtke
- Department of General Surgery and Transplantation, University Hospital Essen, Hufelandstr. 55, D-45122 Essen, Germany
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Radtke A, Bockhorn M, Schroeder T, Lang H, Paul A, Nadalin S, Saner F, Schenk A, Broelsch CE, Malagó M. Computer-gestützte Operationsplanung bei Leberlebendspenden. Zentralbl Chir 2006; 131:69-74. [PMID: 16485214 DOI: 10.1055/s-2006-921453] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
INTRODUCTION The appropriate recipient/donor match is a prerequisite for successful living donor liver transplantation (LDLT). A precise knowledge of the liver anatomy and the functional liver volume plays a key role in allocating live liver donor candidates. With the new software HepaVision, we obtained information on liver mapping by means of virtual 3-dimensional non-invasive imaging reconstructions and were able to perform a virtual simulation of the liver transsection. Aim of our study was to investigate, whether this new computer technology is advantageous in surgery planning for LDLT. METHODS From January 2002 until December 2004 355 liver transplantations were performed in our department, of which 36 were LDLT. According to our evaluation protocol 135 potential donors (63 male, 72 female) between 18 to 59 years received preoperatively an all-in-one CT. The acquired data sets were further analysed with the software HepaVision (MeVis, Germany). RESULTS Of the 135 evaluated donors, we excluded 99 (73 %) from donation based on the HepaVision-data. Reason for exclusion was an inadequate liver volume (70.8 %) or a risk related anatomical anomaly (2.2 %). In the remaining 36 cases a successful graft donation was possible. There were no postoperative complications in the donors and recipients, directly related to a misjudgment of the anatomy or miscalculation of the liver volume. CONCLUSION The systematic use of HepaVision for surgery planning proved to be indispensable for proper donor selection. A virtual simulation of the liver transsection on 3D-model additionally increased the safety of the operation, consequently decreasing the risk for the donor.
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Affiliation(s)
- A Radtke
- Klinik für Allgemein- und Transplantationschirurgie, Universitätsklinikum Essen, Hufelandstrasse 55, 45122 Essen
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Frericks BB, Lehmann KS, Ritz JP, Valdeig S, Albrecht T, Schenk A, Peitgen HO, Wolf KJ. In-vivo Evaluierung eines 3D-Planungssystems zur Berechnung von hepatischen Ablationszonen unter Berücksichtigung der Kühleffekte durch intrahepatische Gefäße. ROFO-FORTSCHR RONTG 2006. [DOI: 10.1055/s-2006-940681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Philippsen A, Schenk A, Signorell G, Kukulski W, Engel A. Methods development and software engineering for 2D electron crystallography. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305096248] [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: 11/10/2022] Open
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Radtke A, Schroeder T, Sotiropoulos GC, Molmenti E, Schenk A, Paul A, Nadalin S, Lang H, Saner F, Peitgen HO, Broelsch CE, Malagò M. Anatomical and physiological classification of hepatic vein dominance applied to liver transplantation. Eur J Med Res 2005; 10:187-94. [PMID: 15946917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023] Open
Abstract
BACKGROUND Proper outflow reconstruction is essential in LDLT. Preoperative planning requires meticulous attention to hepatic vein dominance patterns. The purpose of our study was to provide a combined anatomical-physiological classification of hepatic vein dominance useful for surgical decision-making in both donors and recipients. METHODOLOGY We analyzed 3-dimensional CT-imaging reconstructions of 55 potential live liver donors evaluated at our Institution between January 2003 and May 2004. RESULTS Our data revealed that: 1) The middle hepatic vein (MHV) and left hepatic vein (LHV) show a relative lack of anatomical diversity, whereas the right hepatic vein (RHV) exhibits multiple variants, 2) 45% donors had inferior hepatic veins (IHV) with anatomically and physiologically relevant venous drainage territories, 3) The RHV is usually dominant when present as a single vein without anatomical IHV (type 1A), or when considered as a complex with IHV (type 1Bx) (80% vs. 88%), 4) Only 55% of dominant type 1Bx RHV/IHV-complex automatically included a dominant type 1By RHV by itself, 5) A single RHV out of anatomical complex with IHV (type 1By) was dominant in only 48% of our donor candidates, 6) The MHV types 2A and 2By are strongly dominant accounting for up to 57% of total liver volume (TLV). CONCLUSIONS We propose a new classification based on both anatomical and physiological hepatic venous configurations. Our model also provides a new nomenclature that can be universally applied to preoperative planning in LDLT.
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Affiliation(s)
- A Radtke
- Department of General Surgery and Transplantation, University Hospital Essen, Hufelandstr. 55, D-45122 Essen, Germany
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Mueller WD, Schoepf C, Nascimento ML, Carvalho AC, Moisel M, Schenk A, Scholz F, Lange KP. Electrochemical characterisation of dental alloys: its possibilities and limitations. Anal Bioanal Chem 2005; 381:1520-5. [PMID: 15827724 DOI: 10.1007/s00216-005-3093-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2004] [Revised: 01/13/2005] [Accepted: 01/19/2005] [Indexed: 11/30/2022]
Abstract
Dental alloys are metallic biomaterials which have a broad variation of composition compared to technical alloys. It is therefore in the interest of patients and technicians to conduct a good assessment of the electrochemical behaviour of dental alloys in order to collect information about their corrosion resistance. The purpose of this work was to demonstrate possibilities and limitations of two electrochemical techniques: the voltammetry of immobilised microparticles (ViMP) onto lead, and cyclic voltammetry measurements with the help of the mini-cell system (MCS). Based on fingerprints obtained from ViMP it was possible to analyse and differentiate the dental alloys. The results obtained by MCS were comparable with ViMP, but give a better understanding of the corrosion behaviour of the materials.
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Affiliation(s)
- Wolf-Dieter Mueller
- Dental Materials and Biomaterial Research, Dental School, Charité Medical University of Berlin, Schuhmannstr. 20/21, 10117, Berlin, Germany.
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Róth E, Berna AZ, Beullens K, Schenk A, Lammertyn J, Nicolaï B. Comparison of taste and aroma of integrated and organic apple fruit. Commun Agric Appl Biol Sci 2005; 70:225-9. [PMID: 16366314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Affiliation(s)
- E Róth
- Flanders Centre/Laboratory of Postharvest Technology, Katholieke Universiteit Leuven, Belgium
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Harms J, Thieme S, Bourquain H, Schenk A, Kahn T, Peitgen HO, Hauss J, Fangmann J. Präzisionssteigerung in der Operationsplanung hilärer Gallengangkarzinome: Erste Erfahrungen mit der computerunterstützten 3D-CT-Bildgebung. Visc Med 2004. [DOI: 10.1159/000078073] [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: 11/19/2022] Open
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Meier S, Schenk A, Mildenberger P, Bourquain H, Pitton M, Thelen M. [Evaluation of a new software tool for the automatic volume calculation of hepatic tumors. First results]. ROFO-FORTSCHR RONTG 2004; 176:234-8. [PMID: 14872378 DOI: 10.1055/s-2004-817633] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE Computed tomography has become the preferred method in detecting liver carcinomas. The introduction of spiral CT added volumetric assessment of intrahepatic tumors, which was unattainable in the clinical routine with incremental CT due to complex planimetric revisions and excessive computing time. In an ongoing clinical study, a new software tool was tested for the automatic detection of tumor volume and the time needed for this procedure. MATERIALS AND METHODS We analyzed patients suffering from hepatocellular carcinoma (HCC). All patients underwent treatment with repeated transcatheter chemoembolization of the hepatic arteria. The volumes of the HCC lesions detected in CT were measured with the new software tool in HepaVison (MeVis, Germany). The results were compared with manual planimetric calculation of the volume performed by three independent radiologists. RESULTS Our first results in 16 patients show a correlation between the automatically and the manually calculated volumes (up to a difference of 2 ml) of 96.8 %. While the manual method of analyzing the volume of a lesion requires 2.5 minutes on average, the automatic method merely requires about 30 seconds of user interaction time. CONCLUSION These preliminary results show a good correlation between automatic and manual calculations of the tumor volume. The new software tool requires less time for accurate determination of the tumor volume and can be applied in the daily clinical routine.
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Affiliation(s)
- S Meier
- Klinik und Poliklinik für Radiologie, University Mainz, Germany.
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