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De Bosscher R, Dausin C, Claus P, Bogaert J, Dymarkowski S, Goetschalckx K, Ghekiere O, Van De Heyning CM, Van Herck P, Paelinck B, Addouli HE, La Gerche A, Herbots L, Willems R, Heidbuchel H, Claessen G, Claeys M, Hespel P, Dresselaers T, Miljoen H, Belmans A, Favere K, Vermeulen D, Witvrouwen I, Hansen D, Eijnde BO, Thijs D, Vanvoorden P, Van Soest S. Lifelong endurance exercise and its relation with coronary atherosclerosis. Eur Heart J 2023; 44:2388-2399. [PMID: 36881712 PMCID: PMC10327878 DOI: 10.1093/eurheartj/ehad152] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 02/28/2023] [Accepted: 03/02/2023] [Indexed: 03/09/2023] Open
Abstract
AIMS The impact of long-term endurance sport participation (on top of a healthy lifestyle) on coronary atherosclerosis and acute cardiac events remains controversial. METHODS AND RESULTS The Master@Heart study is a well-balanced prospective observational cohort study. Overall, 191 lifelong master endurance athletes, 191 late-onset athletes (endurance sports initiation after 30 years of age), and 176 healthy non-athletes, all male with a low cardiovascular risk profile, were included. Peak oxygen uptake quantified fitness. The primary endpoint was the prevalence of coronary plaques (calcified, mixed, and non-calcified) on computed tomography coronary angiography. Analyses were corrected for multiple cardiovascular risk factors. The median age was 55 (50-60) years in all groups. Lifelong and late-onset athletes had higher peak oxygen uptake than non-athletes [159 (143-177) vs. 155 (138-169) vs. 122 (108-138) % predicted]. Lifelong endurance sports was associated with having ≥1 coronary plaque [odds ratio (OR) 1.86, 95% confidence interval (CI) 1.17-2.94], ≥ 1 proximal plaque (OR 1.96, 95% CI 1.24-3.11), ≥ 1 calcified plaques (OR 1.58, 95% CI 1.01-2.49), ≥ 1 calcified proximal plaque (OR 2.07, 95% CI 1.28-3.35), ≥ 1 non-calcified plaque (OR 1.95, 95% CI 1.12-3.40), ≥ 1 non-calcified proximal plaque (OR 2.80, 95% CI 1.39-5.65), and ≥1 mixed plaque (OR 1.78, 95% CI 1.06-2.99) as compared to a healthy non-athletic lifestyle. CONCLUSION Lifelong endurance sport participation is not associated with a more favourable coronary plaque composition compared to a healthy lifestyle. Lifelong endurance athletes had more coronary plaques, including more non-calcified plaques in proximal segments, than fit and healthy individuals with a similarly low cardiovascular risk profile. Longitudinal research is needed to reconcile these findings with the risk of cardiovascular events at the higher end of the endurance exercise spectrum.
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Affiliation(s)
- Ruben De Bosscher
- Department of Cardiovascular Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
- Division of Cardiology, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Christophe Dausin
- Department of Movement Sciences, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium
| | - Piet Claus
- Department of Cardiovascular Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Jan Bogaert
- Division of Radiology, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Steven Dymarkowski
- Division of Radiology, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Kaatje Goetschalckx
- Division of Cardiology, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Olivier Ghekiere
- Division of Radiology, Jessa Ziekenhuis, Stadsomvaat 11, 3500 Hasselt, Belgium
- Department of Medicine and Life Sciences, University of Hasselt, Stadsomvaart 11, 3500 Hasselt, Belgium
| | - Caroline M Van De Heyning
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - Paul Van Herck
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - Bernard Paelinck
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - Haroun El Addouli
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - André La Gerche
- Department of Cardiology, Baker Heart and Diabetes Institute, 75 Commercial Road, Melbourne, Victoria 3004, Australia
| | - Lieven Herbots
- Department of Medicine and Life Sciences, University of Hasselt, Stadsomvaart 11, 3500 Hasselt, Belgium
- Division of Cardiology, Hartcentrum, Jessa Ziekenhuis, Stadsomvaart 11, 3500 Hasselt, Belgium
| | - Rik Willems
- Department of Cardiovascular Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
- Division of Cardiology, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Hein Heidbuchel
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - Guido Claessen
- Department of Cardiovascular Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
- Department of Medicine and Life Sciences, University of Hasselt, Stadsomvaart 11, 3500 Hasselt, Belgium
- Department of Cardiology, Baker Heart and Diabetes Institute, 75 Commercial Road, Melbourne, Victoria 3004, Australia
- Division of Cardiology, Hartcentrum, Jessa Ziekenhuis, Stadsomvaart 11, 3500 Hasselt, Belgium
| | - Mathias Claeys
- Department of Cardiovascular Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
- Division of Cardiology, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Peter Hespel
- Department of Movement Sciences, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium
| | - Tom Dresselaers
- Division of Radiology, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Hielko Miljoen
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - Ann Belmans
- I-BioStat, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Kasper Favere
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - Dorien Vermeulen
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - Isabel Witvrouwen
- Division of Cardiology, University Hospital Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
- Cardiovascular Research, University of Antwerp, Drie Eikenstraat 655, 2650 Edegem, Belgium
| | - Dominique Hansen
- Department of Medicine and Life Sciences, University of Hasselt, Stadsomvaart 11, 3500 Hasselt, Belgium
- REVAL/BIOMED, Hasselt University, Agoralaan Gebouw C, 3590 Diepenbeek, Belgium
| | - Bert Op’t Eijnde
- Department of Medicine and Life Sciences, University of Hasselt, Stadsomvaart 11, 3500 Hasselt, Belgium
- REVAL/BIOMED, Hasselt University, Agoralaan Gebouw C, 3590 Diepenbeek, Belgium
| | - Daisy Thijs
- Department of Medicine and Life Sciences, University of Hasselt, Stadsomvaart 11, 3500 Hasselt, Belgium
| | - Peter Vanvoorden
- Department of Medicine and Life Sciences, University of Hasselt, Stadsomvaart 11, 3500 Hasselt, Belgium
| | - Sofie Van Soest
- Department of Cardiovascular Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
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Vanreusel I, Vermeulen D, Goovaerts I, Stoop T, Ectors B, Cornelis J, Hens W, de Bliek E, Heuten H, Van Craenenbroeck EM, Van Berendoncks A, Segers VFM, Briedé JJ. Circulating Reactive Oxygen Species in Adults with Congenital Heart Disease. Antioxidants (Basel) 2022; 11:antiox11122369. [PMID: 36552576 PMCID: PMC9774177 DOI: 10.3390/antiox11122369] [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: 10/30/2022] [Revised: 11/24/2022] [Accepted: 11/25/2022] [Indexed: 12/05/2022] Open
Abstract
Oxidative stress is an important pathophysiological mechanism in the development of numerous cardiovascular disorders, but few studies have examined the levels of oxidative stress in adults with congenital heart disease (CHD). The objective of this study was to investigate oxidative stress levels in adults with CHD and the association with inflammation, exercise capacity and endothelial function. To this end, 36 adults with different types of CHD and 36 age- and gender-matched healthy controls were enrolled. Blood cell counts, hs-CRP, NT-proBNP, fasting glucose, cholesterol levels, iron saturation and folic acid concentrations were determined in venous blood samples. Levels of superoxide anion radical in whole blood were determined using electron paramagnetic resonance spectroscopy in combination with the spin probe CMH. Physical activity was assessed with the IPAQ-SF questionnaire. Vascular function assessment (EndoPAT) and cardiopulmonary exercise testing were performed in the patient group. Superoxide anion radical levels were not statistically significantly different between adults with CHD and the matched controls. Moreover, oxidative stress did not correlate with inflammation, or with endothelial function or cardiorespiratory fitness in CHD; however, a significant negative correlation with iron saturation was observed. Overall, whole blood superoxide anion radical levels in adults with CHD were not elevated, but iron levels seem to play a more important role in oxidative stress mechanisms in CHD than in healthy controls. More research will be needed to improve our understanding of the underlying pathophysiology of CHD.
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Affiliation(s)
- Inne Vanreusel
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, 2000 Antwerp, Belgium
- Correspondence: ; Tel.: +32-3-821-38-47
| | - Dorien Vermeulen
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
| | - Inge Goovaerts
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
| | - Tibor Stoop
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
| | - Bert Ectors
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
| | - Jacky Cornelis
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
| | - Wendy Hens
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
- Cardiac Rehabilitation Centre, Antwerp University Hospital, 2650 Edegem, Belgium
- Department of Rehabilitation Sciences and Physiotherapy, Faculty of Medicine and Health Sciences, MOVANT Research Group, University of Antwerp, 2000 Antwerp, Belgium
| | - Erwin de Bliek
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, 2000 Antwerp, Belgium
- Cardiac Rehabilitation Centre, Antwerp University Hospital, 2650 Edegem, Belgium
| | - Hilde Heuten
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, 2000 Antwerp, Belgium
| | - Emeline M. Van Craenenbroeck
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, 2000 Antwerp, Belgium
| | - An Van Berendoncks
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, 2000 Antwerp, Belgium
| | - Vincent F. M. Segers
- Department of Cardiology, Antwerp University Hospital, 2650 Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, 2000 Antwerp, Belgium
| | - Jacob J. Briedé
- Department of Toxicogenomics, School of Oncology and Developmental Biology (GROW), Maastricht University, 6211 MD Maastricht, The Netherlands
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Vermeulen D, Wooding M, Outhoff K, Dippenaar T. The effect of cold-chain re-introduction on the molecular integrity of rocuronium bromide. Southern African Journal of Anaesthesia and Analgesia 2021. [DOI: 10.36303/sajaa.2021.27.1.2415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Vermeulen D, Van Winckel M, Vande Velde S, De Bruyne R, Van Biervliet S, De Moerloose B, Matthyssens L, Van Renterghem K, Vandeputte D. Not all pediatric intestinal polyps are alike. Acta Gastroenterol Belg 2020; 83:393-397. [PMID: 33094585] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
BACKGROUND/AIMS In childhood, clinical presentation of intes- tinal polyps is variable. Painless rectal red blood loss is the most common presenting sign. Most polyps are sporadic, isolated and benign. However, it is important to correctly identify exceptions. Rare inherited polyposis syndromes need to be recognized because of their increased risk of intestinal and extra-intestinal malignancies. Furthermore, a correct diagnosis and treatment of rare gastro-intestinal malignancies is crucial. METHODS Between 2016 and 2018 we encountered 4 different types of intestinal polyps. A database search was performed and patient files were checked for clinical manifestations and histo- pathology. Literature was searched to recapitulate red flags for these syndromes, probability of underlying genetic disorders and diagnostic criteria. RESULTS Between 2016 and 2018, 28 patients presented at the Ghent University Hospital with 30 juvenile polyps. Furthermore, we diagnosed juvenile polyposis syndrome, Li Fraumeni syndrome and familial adenomatous polyposis (FAP) in 1 patient each, whilst 2 FAP patients were in follow-up. Each of these diagnoses has a different lifetime risk of (extra)-intestinal malignancy and requires a different approach and follow-up. Histopathology and genetic testing play an important role in identifying these syndromes in pediatric patients. CONCLUSION Although most intestinal polyps in childhood are benign juvenile polyps that require no follow-up, rare inherited syndromes should be considered and correctly diagnosed since adequate follow-up is necessary to reduce morbidity and mortality from both gastrointestinal and extraintestinal complications and malignancies.
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Affiliation(s)
- D Vermeulen
- Pediatrics, Ghent University Hospital, Ghent, Belgium
| | - M Van Winckel
- Pediatric gastroenterology, Ghent University Hospital, Ghent, Belgium
| | - S Vande Velde
- Pediatric gastroenterology, Ghent University Hospital, Ghent, Belgium
| | - R De Bruyne
- Pediatric gastroenterology, Ghent University Hospital, Ghent, Belgium
| | - S Van Biervliet
- Pediatric gastroenterology, Ghent University Hospital, Ghent, Belgium
| | - B De Moerloose
- Pediatric hemato-oncology and stem cell transplantation, Ghent University Hospital, Ghent, Belgium
| | - L Matthyssens
- Gastrointestinal and pediatric surgery, Ghent University Hospital, Ghent, Belgium
| | - K Van Renterghem
- Gastrointestinal and pediatric surgery, Ghent University Hospital, Ghent, Belgium
| | - D Vandeputte
- Gastrointestinal and pediatric surgery, Ghent University Hospital, Ghent, Belgium
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Braaksma C, Vermeulen D, van Leeuwen AM, Speth MJGM, Piscaer TM. Bilateral vanishing hips, coincidence or systemic disease? A case report and overview of current literature. J Orthop 2018; 15:641-644. [PMID: 29881211 DOI: 10.1016/j.jor.2018.05.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 03/28/2018] [Accepted: 05/06/2018] [Indexed: 11/25/2022] Open
Abstract
Rapidly progressive hip disease (RDHD) is a rare condition of the hip joint, causing destruction of the femoral head. The pathogenesis is unknown. The disease is self-limiting, there is no treatment to stop the disease. Hip arthroplasty is a successful way to relieve pain and restore function. We present a case where both hips were involved and analysed. A favourable result was obtained by bilateral total hip arthroplasty.
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Affiliation(s)
- C Braaksma
- Department of Orthopaedic Surgery, St. Antonius Hospital, Utrecht/Nieuwegein, The Netherlands
| | - D Vermeulen
- Department of Orthopaedic Surgery, St. Antonius Hospital, Utrecht/Nieuwegein, The Netherlands
| | - A M van Leeuwen
- Department of Pathology, St. Antonius Hospital, Utrecht/Nieuwegein, The Netherlands
| | - M J G M Speth
- Department of Orthopaedic Surgery, St. Antonius Hospital, Utrecht/Nieuwegein, The Netherlands
| | - T M Piscaer
- Department of Orthopaedic Surgery, Erasmus University Medical Center, Rotterdam, The Netherlands
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Jacobs L, Delezie E, Duchateau L, Goethals K, Vermeulen D, Buyse J, Tuyttens FAM. Fit for transport? Broiler chicken fitness assessment for transportation to slaughter. Anim Welf 2017. [DOI: 10.7120/09627286.26.3.335] [Citation(s) in RCA: 3] [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: 11/05/2022]
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Fonari A, Corbin NS, Vermeulen D, Goetz KP, Jurchescu OD, McNeil LE, Bredas JL, Coropceanu V. Vibrational properties of organic donor-acceptor molecular crystals: Anthracene-pyromellitic-dianhydride (PMDA) as a case study. J Chem Phys 2016; 143:224503. [PMID: 26671386 DOI: 10.1063/1.4936965] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
We establish a reliable quantum-mechanical approach to evaluate the vibrational properties of donor-acceptor molecular crystals. The anthracene-PMDA (PMDA = pyromellitic dianhydride) crystal, where anthracene acts as the electron donor and PMDA as the electron acceptor, is taken as a representative system for which experimental non-resonance Raman spectra are also reported. We first investigate the impact that the amount of nonlocal Hartree-Fock exchange (HFE) included in a hybrid density functional has on the geometry, normal vibrational modes, electronic coupling, and electron-vibrational (phonon) couplings. The comparison between experimental and theoretical Raman spectra indicates that the results based on the αPBE functional with 25%-35% HFE are in better agreement with the experimental results compared to those obtained with the pure PBE functional. Then, taking αPBE with 25% HFE, we assign the vibrational modes and examine their contributions to the relaxation energy related to the nonlocal electron-vibration interactions. The results show that the largest contribution (about 90%) is due to electron interactions with low-frequency vibrational modes. The relaxation energy in anthracene-PMDA is found to be about five times smaller than the electronic coupling.
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Affiliation(s)
- A Fonari
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
| | - N S Corbin
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
| | - D Vermeulen
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255, USA
| | - K P Goetz
- Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109-7507, USA
| | - O D Jurchescu
- Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109-7507, USA
| | - L E McNeil
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255, USA
| | - J L Bredas
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
| | - V Coropceanu
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
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Abstract
We discuss an optical isolator design based on tandem phase modulators in a long interferometer. It provides low-loss, broadband isolation in a photonic integrated circuit without requiring special materials or fabrication steps. It was demonstrated in silicon photonics.
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Vermeulen D, De Koninck Y, Li Y, Lambert E, Bogaerts W, Baets R, Roelkens G. Reflectionless grating couplers for Silicon-on-Insulator photonic integrated circuits. Opt Express 2012; 20:22278-22283. [PMID: 23037375 DOI: 10.1364/oe.20.022278] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We propose a novel grating coupler design which is inherently reflectionless by focusing the reflected light away from the entrance waveguide. The design rules for this reflectionless grating coupler are explained and the grating coupler design is investigated by means of 3D FDTD simulations for the case of a Silicon-on-Insulator based platform.
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Affiliation(s)
- D Vermeulen
- Photonics Research Group, Department of Information Technology, Ghent University - imec, B-9000 Ghent, Belgium.
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Vermeulen D, Selvaraja S, Verheyen P, Lepage G, Bogaerts W, Absil P, Van Thourhout D, Roelkens G. High-efficiency fiber-to-chip grating couplers realized using an advanced CMOS-compatible silicon-on-insulator platform. Opt Express 2010; 18:18278-83. [PMID: 20721220 DOI: 10.1364/oe.18.018278] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A new generation of Silicon-on-Insulator fiber-to-chip grating couplers which use a silicon overlay to enhance the directionality and thereby the coupling efficiency is presented. Devices are realized on a 200 mm wafer in a CMOS pilot line. The fabricated fiber couplers show a coupling efficiency of -1.6 dB and a 3 dB bandwidth of 80 nm.
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Affiliation(s)
- D Vermeulen
- Photonics Research Group, Department of Information Technology, Ghent University-imec, B-9000 Ghent, Belgium.
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Roelkens G, Vermeulen D, Van Laere F, Selvaraja S, Scheerlinck S, Taillaert D, Bogaerts W, Dumon P, Van Thourhout D, Baets R. Bridging the gap between nanophotonic waveguide circuits and single mode optical fibers using diffractive grating structures. J Nanosci Nanotechnol 2010; 10:1551-1562. [PMID: 20355543 DOI: 10.1166/jnn.2010.2031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this paper, the use of diffractive grating structures to efficiently interface between a single mode fiber and a high index contrast waveguide circuit is outlined. We show that high index contrast grating structures allow for broadband and high efficiency coupling. Since no polished facet is required on the photonic integrated circuit to interface with the optical fiber, fiber-to-chip grating couplers enable wafer-scale testing, reducing the cost for testing large scale integrated optical circuits. We show that two-dimensional grating structures can solve the problem of the huge polarization dependence of high index contrast photonic integrated circuits. Finally, an optical probe is presented, which allows testing individual components of a photonic integrated circuit, analogous to the electrical probes used in micro-electronics.
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Affiliation(s)
- G Roelkens
- Photonics Research Group, Ghent University/IMEC, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium
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De Schrijver R, Vermeulen D, Daems V. Dose-response relationships between dietary (n-3) fatty acids and plasma and tissue lipids, steroid excretion and urinary malondialdehyde in rats. J Nutr 1992; 122:1979-87. [PMID: 1527639 DOI: 10.1093/jn/122.10.1979] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
For a 28-d experimental period, rats were fed a nonpurified, cereal-based diet containing 9.1% supplemental beef tallow or fish oil or one of the following beef tallow:fish oil blends: 95:5; 90:10; 80:20 and 50:50. All diets provided between 21.3 and 22.7 g linoleic acid/kg. Higher fish oil intake was paralleled by elevated incorporation of long-chain (n-3) fatty acids in plasma total lipid, mainly at the expense of arachidonic acid. Significant inverse relationships were found between plasma total (n-3) fatty acid concentration and plasma triglyceride, cholesterol or free fatty acid concentrations. Fish oil intake did not lead to a shift of triglycerides or cholesterol from the plasma to the tissues (liver, heart, kidneys). Reduced plasma cholesterol concentrations in the fish oil-fed rats could not be explained by higher fecal excretion of neutral sterols and bile acids. In vivo lipid peroxidation, assessed by urinary malondialdehyde excretion, was enhanced when diets containing greater than 1.8% fish oil were fed.
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Affiliation(s)
- R De Schrijver
- Laboratory of Nutrition, Catholic University of Leuven, Belgium
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13
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Türler A, Gäggeler HW, Gregorich KE, Barth H, Brüchle W, Czerwinski KR, Gober MK, Hannink NJ, Henderson RA, Hoffman DC, Jost DT, Kacher CD, Kadkhodayan B, Kovacs J, Kratz JV, Kreek SA, Lee DM, Leyba JD, Nurmia MJ, Schädel M, Scherer UW, Schimpf, Vermeulen D, Weber A, Zimmermann HP, Zvara I. Gas phase chromatography of halides of elements 104 and 105. J Radioanal Nucl Chem 1992. [DOI: 10.1007/bf02037108] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Waltham C, Bernasconi T, Egli S, Hermes E, Muheim F, Niebuhr C, Pruys H, Bertl W, Grossmann-Handschin M, Lordong N, Vermeulen D, Walter HK, Eichler R, Felawka L, Kozlowski T, Playfer S, Martino J. Search for weakly interacting neutral bosons produced in pi -p interactions at rest and decaying into e+e- pairs. Phys Rev Lett 1992; 68:3845-3848. [PMID: 10045819 DOI: 10.1103/physrevlett.68.3845] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Drees RM, Waltham C, Bernasconi T, Egli S, Hermes E, Muheim F, Niebuhr C, Pruys H, Bertl W, Grossmann-Handschin M, Lordong N, Vermeulen D, Walter HK, Eichler R, Felawka L, Kozlowski T, Playfer S, Martino J. Measurement of the pi 0 electromagnetic transition form factor. Phys Rev D Part Fields 1992; 45:1439-1447. [PMID: 10014516 DOI: 10.1103/physrevd.45.1439] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Gäggeler HW, Jost DT, Kovacs J, Scherer UW, Weber A, Vermeulen D, Türler A, Gregorich KE, Henderson RA, Czerwinski KR, Kadkhodayan B, Lee DM, Nurmia M, Hoffman DC, Kratz JV, Gober MK, Zimmermann HP, Schädel M, Brüchle W, Schimpf E, Zvara I. Gas Phase Chromatography Experiments with Bromides of Tantalum and Element 105. ACTA ACUST UNITED AC 1992. [DOI: 10.1524/ract.1992.57.23.93] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
| | - D. T. Jost
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - J. Kovacs
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - U. W, Scherer
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - A. Weber
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - D. Vermeulen
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - A. Türler
- Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA
| | | | | | | | | | - D. M. Lee
- Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA
| | - M. Nurmia
- Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA
| | - D. C. Hoffman
- Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA
| | - J. V. Kratz
- Institut für Kernchemie, Universität Mainz, D-6500 Mainz, Federal Republic of Germany
| | - M. K. Gober
- Institut für Kernchemie, Universität Mainz, D-6500 Mainz, Federal Republic of Germany
| | - H. P. Zimmermann
- Institut für Kernchemie, Universität Mainz, D-6500 Mainz, Federal Republic of Germany
| | - M. Schädel
- Gesellschaft für Schwerionenforschung mbH, D-6100 Darmstadt, Federal Republic of Germany
| | - W. Brüchle
- Gesellschaft für Schwerionenforschung mbH, D-6100 Darmstadt, Federal Republic of Germany
| | - E. Schimpf
- Gesellschaft für Schwerionenforschung mbH, D-6100 Darmstadt, Federal Republic of Germany
| | - I. Zvara
- Joint Institute for Nuclear Research, Dubna, USSR
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De Schrijver R, Vermeulen D, Viaene E. Lipid metabolism responses in rats fed beef tallow, native or randomized fish oil and native or randomized peanut oil. J Nutr 1991; 121:948-55. [PMID: 2051237 DOI: 10.1093/jn/121.7.948] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [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: 12/30/2022] Open
Abstract
In experiments with male Wistar rats, we measured the effects of nonpurified diets containing 9.1% added fat (beef tallow, native or randomized fish oil, native or randomized peanut oil) on apparent digestibility of total fat and individual fatty acids. We also investigated the effects of the diets on plasma contents of triglyceride, cholesterolesters and free and total cholesterol as well as on the fatty acid profiles of plasma and liver phospholipids. Randomization of fish oil or peanut oil had no significant effect on any of the lipid measurements. Fat digestibility was significantly lower in the rats fed beef tallow. Apparent absorption of 18:1(n-9) and polyunsaturated fatty acids was not dependent on the fatty acid profile of the dietary fat. Apparent absorption of 16:1(n-7) and saturated fatty acids was generally highest in the rats fed fish oil. Intake of fish oil or peanut oil significantly decreased plasma triglyceride content. Intake of fish oil resulted in substantially decreased contents of total cholesterol and cholesterolesters in plasma, but intake of peanut oil did not. Efficiency of conversion of 18:2(n-6) into 20:4(n-6) was inhibited by long-chain (n-3) fatty acids.
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Affiliation(s)
- R De Schrijver
- Laboratory of Nutrition, Catholic University of Leuven, Belgium
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Abstract
This study was designed to test the hypotheses that digestibility and post-absorption metabolism of fish oil are influenced by impaired lipolysis and by the stereospecific composition of its triacylglycerols. Male Wistar rats were fed nonpurified diets containing one of the following fat sources: 9% native fish oil (NFO), 9% autorandomized fish oil (RFO), 8.1% fish oil-derived free fatty acids (FO-FFA) plus 0.9% glycerol, or 9% soybean oil (SO) as a reference fat. In a 24-day balance study, apparent digestibility of total dietary fat averaged 93.1% in the SO, NFO and RFO groups, and 90.9% in the FO-FFA group. Randomization of fish oil had no effect on apparent digestibility of individual fatty acids. In rats fed FO-FFA, apparent absorption of saturated and monounsaturated fatty acids was lower when compared to the NFO and RFO groups. Feeding the FO-FFA diet tended to increase plasma triglyceride content. The hypocholesterolemic effect of polyunsaturated n-3 fatty acids was not influenced by the dietary source. Similar effects on fatty acid profiles of plasma and liver phospholipids were caused by the NFO, RFO and the FO-FFA diets. We conclude that once polyunsaturated n-3 fatty acids are absorbed, their effect on lipid metabolism is not determined by the dietary source.
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Affiliation(s)
- R De Schrijver
- Laboratory of Nutrition, Catholic University of Leuven, Belgium
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19
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Abstract
A procedure has been developed to separate and quantitate phospholipids, including phosphatidylinositol and phosphatidylserine, from animal tissues by means of the Iatroscan TLC/FID technique. The method is based on the use of 0.01 M oxalic acid impregnated Chromarods-SII and stepwise resolution of the phospholipids in the presence of 1,2-dipalmitoyl-sn-glycero-3-phospho (N,N-dimethylethanolamine) as internal standard. To remove the neutral lipids, the rods are initially developed in a non-polar solvent mixture followed by partial scanning. Next, the rods are impregnated with oxalic acid, developed twice in CHCl3/CH3OH/CH3COOH/HCOOH/H2O (80:35:2:1:3, v/v/v/v/v) and partially scanned for measuring lysophosphatidylcholine, sphingomyelin and phosphatidylcholine. The subsequent step involves double development in CHCl3/CH3OH/30% NH4OH (60:35:0.9, v/v/v) to resolve cardiolipin, internal standard, phosphatidylethanolamine, phosphatidylinositol, phosphatidylserine and phosphatidic acid. For each phospholipid a linear calibration curve with a highly significant correlation coefficient was obtained. However, the calibration lines extrapolated to negative intercepts on the ordinate, indicating declining sensitivity at low phospholipid loads.
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Affiliation(s)
- R De Schrijver
- Catholic University of Leuven, Laboratory of Nutrition, Belgium
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Klemp P, Vermeulen D. Reiter's syndrome in a married couple. Br J Rheumatol 1990; 29:500. [PMID: 2257475 DOI: 10.1093/rheumatology/29.6.500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Niebuhr C, Eichler R, Felawka L, Kozlowski T, Playfer S, Walter HK, Egli S, Grossmann-Handschin M, Hermes E, Muheim F, Pruys H, Vermeulen D, Bertl W, Lordong N, Martino J, Drees RM, Waltham C, Bellgardt U. Search for the decay pi 0-->e+e-. Phys Rev D Part Fields 1989; 40:2796-2802. [PMID: 10012132 DOI: 10.1103/physrevd.40.2796] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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22
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Hessberger F, Münzenberg G, Hofmann S, Armbruster P, Agarwal Y, Reisdorf W, Poppensieker K, Schmidt KH, Schneider J, Schneider W, Schött H, Sahm CC, Vermeulen D, Thuma B. Experiments on the synthesis of neutron-deficient isotopes with atomic numbers in the region from Z = 102 to Z = 105. ACTA ACUST UNITED AC 1986. [DOI: 10.1016/0022-5088(86)90440-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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He�berger FP, M�nzenberg G, Hofmann S, Reisdorf W, Schmidt KH, Sch�tt HJ, Armbruster P, Hingmann R, Thuma B, Vermeulen D. Study of evaporation residues produced in reactions of207,208Pb with50Ti. ACTA ACUST UNITED AC 1985. [DOI: 10.1007/bf01493453] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Armbruster P, Agarwal YK, Brüchle W, Brügger M, Dufour JP, Gaggeler H, Hessberger FP, Hofmann S, Lemmertz P, Münzenberg G, Poppensieker K, Reisdorf W, Schadel M, Schmidt K, Schneider JH, Schneider WF, Sümmerer K, Vermeulen D, Wirth AG, Ghiorso A, Gregorich KE, Lee D, Leino M, Moody KJ, Seaborg GT, Welch RB, Wilmarth P, Yashita S, Frink C, Greulich N, Herrmann G, Hickmann U, Hildebrand N, Kratz JV, Trautman N, Fowler MM, Hoffman DC, Daniels WR, Dornhöfer H. Attempts to produce superheavy elements by fusion of 48Ca with 248Cm in the bombarding energy range of 4.5-5.2 MeV/u. Phys Rev Lett 1985; 54:406-409. [PMID: 10031507 DOI: 10.1103/physrevlett.54.406] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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M�nzenberg G, Reisdorf W, Hofmann S, Agarwal YK, He�berger FP, Poppensieker K, Schneider JRH, Schneider WFW, Schmidt KH, Sch�tt HJ, Armbruster P, Sahm CC, Vermeulen D. Evidence for element 109 from one correlated decay sequence following the fusion of58Fe with209Bi. ACTA ACUST UNITED AC 1984. [DOI: 10.1007/bf01419373] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Münzenberg G, Faust W, Heβberger F, Hofmann S, Reisdorf W, Schmidt KH, Schneider W, Schött H, Armbruster P, Güttner K, Thuma B, Ewald H, Vermeulen D. The velocity filter SHIP, performance and survey of current experiments. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0029-554x(81)90935-6] [Citation(s) in RCA: 26] [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: 11/25/2022]
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27
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