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van Ooijen I, Annink K, Benders M, Dudink J, Alderliesten T, Groenendaal F, Tataranno M, Lequin M, Hoogduin J, Visser F, Raaijmakers A, Klomp D, Wiegers E, Wijnen J, van der Aa N. Introduction of ultra-high-field MR brain imaging in infants: vital parameters, temperature and comfort. Neuroimage Rep 2023; 3:100175. [PMID: 38357432 PMCID: PMC10865273 DOI: 10.1016/j.ynirp.2023.100175] [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] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/19/2023] [Accepted: 05/20/2023] [Indexed: 02/16/2024]
Abstract
Background Brain MRI in infants at ultra-high-field scanners might improve diagnostic quality, but safety should be evaluated first. In our previous study, we reported simulated specific absorption rates and acoustic noise data at 7 Tesla. Methods In this study, we included twenty infants between term-equivalent age and three months of age. The infants were scanned on a 7 Tesla MRI directly after their clinically indicated 3 Tesla brain MRI scan. Vital parameters, temperature, and comfort were monitored throughout the process. Brain temperature was estimated during the MRI scans using proton MR spectroscopy. Results We found no significant differences in vital parameters, temperature, and comfort during and after 7 Tesla MRI scans, compared to 3 Tesla MRI scans. Conclusions These data confirm our hypothesis that scanning infants at 7 Tesla MRI appears to be safe and we identified no additional risks from scanning at 3 Tesla MRI.
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Affiliation(s)
- I.M. van Ooijen
- Department of Neonatology, University Medical Center Utrecht, Utrecht Brain Center, University Utrecht, Utrecht, the Netherlands
- Centre for Image Sciences, High Field MR Research, University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - K.V. Annink
- Department of Neonatology, University Medical Center Utrecht, Utrecht Brain Center, University Utrecht, Utrecht, the Netherlands
| | - M.J.N.L. Benders
- Department of Neonatology, University Medical Center Utrecht, Utrecht Brain Center, University Utrecht, Utrecht, the Netherlands
| | - J. Dudink
- Department of Neonatology, University Medical Center Utrecht, Utrecht Brain Center, University Utrecht, Utrecht, the Netherlands
| | - T. Alderliesten
- Department of Neonatology, University Medical Center Utrecht, Utrecht Brain Center, University Utrecht, Utrecht, the Netherlands
| | - F. Groenendaal
- Department of Neonatology, University Medical Center Utrecht, Utrecht Brain Center, University Utrecht, Utrecht, the Netherlands
| | - M.L. Tataranno
- Department of Neonatology, University Medical Center Utrecht, Utrecht Brain Center, University Utrecht, Utrecht, the Netherlands
| | - M.H. Lequin
- Departement of Radiology, Division of Imaging and Oncology, University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - J.M. Hoogduin
- Centre for Image Sciences, High Field MR Research, University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - F. Visser
- Centre for Image Sciences, High Field MR Research, University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - A.J.E. Raaijmakers
- Centre for Image Sciences, High Field MR Research, University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - D.W.J. Klomp
- Centre for Image Sciences, High Field MR Research, University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - E.C. Wiegers
- Centre for Image Sciences, High Field MR Research, University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - J.P. Wijnen
- Centre for Image Sciences, High Field MR Research, University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - N.E. van der Aa
- Department of Neonatology, University Medical Center Utrecht, Utrecht Brain Center, University Utrecht, Utrecht, the Netherlands
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Noll GA, Furch ACU, Rose J, Visser F, Prüfer D. Guardians of the phloem - forisomes and beyond. New Phytol 2022; 236:1245-1260. [PMID: 36089886 DOI: 10.1111/nph.18476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 07/27/2022] [Indexed: 06/15/2023]
Abstract
The phloem is a highly specialized vascular tissue that forms a fundamentally important transport and signaling pathway in plants. It is therefore a system worth protecting. The main function of the phloem is to transport the products of photosynthesis throughout the whole plant, but it also transports soluble signaling molecules and propagates electrophysiological signals. The phloem is constantly threatened by mechanical injuries, phloem-sucking pests and parasites, and the spread of pathogens, which has led to the evolution of efficient defense mechanisms. One such mechanism involves structural phloem proteins, which are thought to facilitate sieve element occlusion following injury and to defend the plant against pathogens. In leguminous plants, specialized structural phloem proteins known as forisomes form unique mechanoproteins via sophisticated molecular interaction and assembly mechanisms, thus enabling reversible sieve element occlusion. By understanding the structure and function of forisomes and other structural phloem proteins, we can develop a toolbox for biotechnological applications in material science and medicine. Furthermore, understanding the involvement of structural phloem proteins in plant defense mechanisms will allow phloem engineering as a new strategy for the development of crop varieties that are resistant to pests, pathogens and parasites.
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Affiliation(s)
- Gundula A Noll
- Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, 48143, Muenster, Germany
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Schlossplatz 8, 48143, Muenster, Germany
| | - Alexandra C U Furch
- Matthias Schleiden Institute for Genetics, Bioinformatics and Molecular Botany, Friedrich Schiller University Jena, Dornburger Straße 159, 07743, Jena, Germany
| | - Judith Rose
- Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, 48143, Muenster, Germany
| | - Franziska Visser
- Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, 48143, Muenster, Germany
| | - Dirk Prüfer
- Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, 48143, Muenster, Germany
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Schlossplatz 8, 48143, Muenster, Germany
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Durban JW, Southall BL, Calambokidis J, Casey C, Fearnbach H, Joyce TW, Fahlbusch JA, Oudejans MG, Fregosi S, Friedlaender AS, Kellar NM, Visser F. Integrating remote sensing methods during controlled exposure experiments to quantify group responses of dolphins to navy sonar. Mar Pollut Bull 2022; 174:113194. [PMID: 34902768 DOI: 10.1016/j.marpolbul.2021.113194] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 11/21/2021] [Accepted: 11/23/2021] [Indexed: 06/14/2023]
Abstract
Human noise can be harmful to sound-centric marine mammals. Significant research has focused on characterizing behavioral responses of protected cetacean species to navy mid-frequency active sonar (MFAS). Controlled exposure experiments (CEE) using animal-borne tags have proved valuable, but smaller dolphins are not amenable to tagging and groups of interacting individuals are more relevant behavioral units for these social species. To fill key data gaps on group responses of social delphinids that are exposed to navy MFAS in large numbers, we describe novel approaches for the coordinated collection and integrated analysis of multiple remotely-sensed datasets during CEEs. This involves real-time coordination of a sonar source, shore-based group tracking, aerial photogrammetry to measure fine-scale movements and passive acoustics to quantify vocal activity. Using an example CEE involving long-beaked common dolphins (Delphinus delphis bairdii), we demonstrate how resultant quantitative metrics can be used to estimate behavioral changes and noise exposure-response relationships.
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Affiliation(s)
- J W Durban
- Southall Environmental Associates, Inc., 9099 Soquel Drive, Aptos, CA 95003, USA; Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, 8901 La Jolla Shores Drive, La Jolla, CA 92037, USA.
| | - B L Southall
- Southall Environmental Associates, Inc., 9099 Soquel Drive, Aptos, CA 95003, USA; Institute of Marine Sciences, University of California Santa Cruz, 115 McAllister Way, Santa Cruz, CA 95060, USA
| | - J Calambokidis
- Cascadia Research Collective, 218 1/2 W 4th Ave., Olympia, WA 98501, USA
| | - C Casey
- Southall Environmental Associates, Inc., 9099 Soquel Drive, Aptos, CA 95003, USA; Institute of Marine Sciences, University of California Santa Cruz, 115 McAllister Way, Santa Cruz, CA 95060, USA
| | - H Fearnbach
- SR3 SeaLife Response, Rehabilitation and Research, 2003 S. 216th St. #98811, Des Moines, WA 98198, USA
| | - T W Joyce
- Environmental Assessment Services, 350 Hills St., Suite 112, Richland, WA 99354, USA
| | - J A Fahlbusch
- Cascadia Research Collective, 218 1/2 W 4th Ave., Olympia, WA 98501, USA; Department of Biology, Hopkins Marine Station, Stanford University, Pacific Grove, CA 93950, USA
| | - M G Oudejans
- Kelp Marine Research, 1624 CJ Hoorn, the Netherlands
| | - S Fregosi
- Southall Environmental Associates, Inc., 9099 Soquel Drive, Aptos, CA 95003, USA
| | - A S Friedlaender
- Southall Environmental Associates, Inc., 9099 Soquel Drive, Aptos, CA 95003, USA; Institute of Marine Sciences, University of California Santa Cruz, 115 McAllister Way, Santa Cruz, CA 95060, USA
| | - N M Kellar
- Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, 8901 La Jolla Shores Drive, La Jolla, CA 92037, USA
| | - F Visser
- Kelp Marine Research, 1624 CJ Hoorn, the Netherlands; Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94240, 1090 GE Amsterdam, the Netherlands; Department of Coastal Systems, Royal Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Texel, the Netherlands
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Visser F, Merten VJ, Bayer T, Oudejans MG, de Jonge DSW, Puebla O, Reusch TBH, Fuss J, Hoving HJT. Deep-sea predator niche segregation revealed by combined cetacean biologging and eDNA analysis of cephalopod prey. Sci Adv 2021; 7:eabf5908. [PMID: 33789903 PMCID: PMC8011969 DOI: 10.1126/sciadv.abf5908] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 02/11/2021] [Indexed: 05/06/2023]
Abstract
Fundamental insight on predator-prey dynamics in the deep sea is hampered by a lack of combined data on hunting behavior and prey spectra. Deep-sea niche segregation may evolve when predators target specific prey communities, but this hypothesis remains untested. We combined environmental DNA (eDNA) metabarcoding with biologging to assess cephalopod community composition in the deep-sea foraging habitat of two top predator cetaceans. Risso's dolphin and Cuvier's beaked whale selectively targeted distinct epi/meso- and bathypelagic foraging zones, holding eDNA of 39 cephalopod taxa, including 22 known prey. Contrary to expectation, extensive taxonomic overlap in prey spectra between foraging zones indicated that predator niche segregation was not driven by prey community composition alone. Instead, intraspecific prey spectrum differences may drive differentiation for hunting fewer, more calorific, mature cephalopods in deeper waters. The novel combination of methods presented here holds great promise to disclose elusive deep-sea predator-prey systems, aiding in their protection.
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Affiliation(s)
- F Visser
- Department of Freshwater and Marine Ecology, IBED, University of Amsterdam, Amsterdam, the Netherlands.
- Department of Coastal Systems, NIOZ Royal Netherlands Institute for Sea Research, Texel, the Netherlands
- Kelp Marine Research, Hoorn, the Netherlands
| | - V J Merten
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - T Bayer
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | | | - D S W de Jonge
- Deep-Sea Ecology and Biogeochemistry Research Group, The Lyell Centre for Earth and Marine Science and Technology, Heriot-Watt University, Edinburgh, United Kingdom
| | - O Puebla
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
- Leibniz Centre for Tropical Marine Research, Bremen, Germany
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany
| | - T B H Reusch
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - J Fuss
- Institute of Clinical Molecular Biology, Kiel University, Kiel, Germany
| | - H J T Hoving
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
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Visser F, Apostolov VI, Vlaar AMM, Twisk JWR, Weinstein HC, Berendse HW. Visual hallucinations in Parkinson's disease are associated with thinning of the inner retina. Sci Rep 2020; 10:21110. [PMID: 33273513 PMCID: PMC7712774 DOI: 10.1038/s41598-020-77833-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 11/10/2020] [Indexed: 11/09/2022] Open
Abstract
Visual hallucinations (VH) are common in patients with Parkinson's disease (PD), yet the underlying pathophysiological mechanisms are still unclear. We aimed to explore the association of the presence of VH with inner retinal thinning and, secondarily, with visual acuity. To this end, we included 40 PD patients in this exploratory study, of whom 14 had VH, and 22 age- and sex-matched healthy controls. All participants were interviewed for the presence of VH by a neurologist specialized in movement disorders and underwent a thorough ophthalmologic examination, including measurement of the best-corrected visual acuity (BCVA) and optical coherence tomography to obtain macular scans of the combined ganglion cell layer and inner plexiform layer (GCL-IPL). Patients with VH had a thinner GCL-IPL than patients without VH, which persisted after correction for age, disease stage, levodopa equivalent daily dose (LED) and cognitive function. Furthermore, BCVA was lower in the PD group with VH than in the PD group without VH, although only a trend remained after correction for age, disease stage, LED and cognitive function. Taken together, in patients with PD, visual hallucinations appear to be associated with a thinning of the inner retinal layers and, possibly, with reduced visual acuity. Further research using a longitudinal design is necessary to confirm these findings and to establish the causality of these relationships.
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Affiliation(s)
- F Visser
- Department of Neurology, OLVG, Jan Tooropstraat 164, 1061 AE, Amsterdam, The Netherlands.
| | - V I Apostolov
- Department of Ophthalmology, OLVG, Jan Tooropstraat 164, 1061 AE, Amsterdam, The Netherlands
| | - A M M Vlaar
- Department of Neurology, OLVG, Jan Tooropstraat 164, 1061 AE, Amsterdam, The Netherlands
| | - J W R Twisk
- Department of Epidemiology and Data Science, Amsterdam UMC, De Boelelaan 1089a, 1081 HV, Amsterdam, The Netherlands
| | - H C Weinstein
- Department of Neurology, OLVG, Jan Tooropstraat 164, 1061 AE, Amsterdam, The Netherlands.,Department of Neurology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
| | - H W Berendse
- Department of Neurology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
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Verhoeven K, Vilches-Freixas G, Limpens K, Mannens J, Van der Klugt K, Velders M, Visser F, Peeters S, Bosmans G, Boersma L. PO-1573: First clinical experience with model-based selection for breast cancer proton therapy. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01591-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Verhoeven K, Opbroek T, Vilches-Freixas G, Limpens K, Mannens J, Pijls M, Van der Klugt K, Velders M, Visser F, Peeters S, Reymen B, Van Baardwijk A, Van Loon J, Bosmans G, Boersma L. Prospectively registered acute toxicity in breast cancer patients undergoing adjuvant intensity modulated proton therapy. Eur J Cancer 2020. [DOI: 10.1016/s0959-8049(20)30762-0] [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: 11/16/2022]
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Annink KV, van der Aa NE, Dudink J, Alderliesten T, Groenendaal F, Lequin M, Jansen FE, Rhebergen KS, Luijten P, Hendrikse J, Hoogduin HJM, Huijing ER, Versteeg E, Visser F, Raaijmakers AJE, Wiegers EC, Klomp DWJ, Wijnen JP, Benders MJNL. Introduction of Ultra-High-Field MR Imaging in Infants: Preparations and Feasibility. AJNR Am J Neuroradiol 2020; 41:1532-1537. [PMID: 32732273 DOI: 10.3174/ajnr.a6702] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 05/19/2020] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND PURPOSE Cerebral MR imaging in infants is usually performed with a field strength of up to 3T. In adults, a growing number of studies have shown added diagnostic value of 7T MR imaging. 7T MR imaging might be of additional value in infants with unexplained seizures, for example. The aim of this study was to investigate the feasibility of 7T MR imaging in infants. We provide information about the safety preparations and show the first MR images of infants at 7T. MATERIALS AND METHODS Specific absorption rate levels during 7T were simulated in Sim4life using infant and adult models. A newly developed acoustic hood was used to guarantee hearing protection. Acoustic noise damping of this hood was measured and compared with the 3T Nordell hood and no hood. In this prospective pilot study, clinically stable infants, between term-equivalent age and the corrected age of 3 months, underwent 7T MR imaging immediately after their standard 3T MR imaging. The 7T scan protocols were developed and optimized while scanning this cohort. RESULTS Global and peak specific absorption rate levels in the infant model in the centered position and 50-mm feet direction did not exceed the levels in the adult model. Hearing protection was guaranteed with the new hood. Twelve infants were scanned. No MR imaging-related adverse events occurred. It was feasible to obtain good-quality imaging at 7T for MRA, MRV, SWI, single-shot T2WI, and MR spectroscopy. T1WI had lower quality at 7T. CONCLUSIONS 7T MR imaging is feasible in infants, and good-quality scans could be obtained.
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Affiliation(s)
- K V Annink
- From the Departments of Neonatology (K.V.A., N.E.v.d.A., J.D., T.A., F.G., M.J.N.L.B.), and Paediatric Neurology (F.E.J.), University Medical Center Utrecht Brain Center
| | - N E van der Aa
- From the Departments of Neonatology (K.V.A., N.E.v.d.A., J.D., T.A., F.G., M.J.N.L.B.), and Paediatric Neurology (F.E.J.), University Medical Center Utrecht Brain Center
| | - J Dudink
- From the Departments of Neonatology (K.V.A., N.E.v.d.A., J.D., T.A., F.G., M.J.N.L.B.), and Paediatric Neurology (F.E.J.), University Medical Center Utrecht Brain Center
| | - T Alderliesten
- From the Departments of Neonatology (K.V.A., N.E.v.d.A., J.D., T.A., F.G., M.J.N.L.B.), and Paediatric Neurology (F.E.J.), University Medical Center Utrecht Brain Center
| | - F Groenendaal
- From the Departments of Neonatology (K.V.A., N.E.v.d.A., J.D., T.A., F.G., M.J.N.L.B.), and Paediatric Neurology (F.E.J.), University Medical Center Utrecht Brain Center
| | - M Lequin
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - F E Jansen
- From the Departments of Neonatology (K.V.A., N.E.v.d.A., J.D., T.A., F.G., M.J.N.L.B.), and Paediatric Neurology (F.E.J.), University Medical Center Utrecht Brain Center
| | - K S Rhebergen
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - P Luijten
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - J Hendrikse
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - H J M Hoogduin
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - E R Huijing
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - E Versteeg
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - F Visser
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - A J E Raaijmakers
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - E C Wiegers
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - D W J Klomp
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - J P Wijnen
- the Departments of Radiology (M.L., P.L., J.H., H.J.M.H., E.R.H., E.V., F.V., A.J.E.R., E.C.W., D.W.J.K., J.P.W.), and Otorhinolaryngology and Head and Neck Surgery (K.S.R.), University Medical Center Utrecht, University Utrecht, Utrecht, the Netherlands
| | - M J N L Benders
- From the Departments of Neonatology (K.V.A., N.E.v.d.A., J.D., T.A., F.G., M.J.N.L.B.), and Paediatric Neurology (F.E.J.), University Medical Center Utrecht Brain Center
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Goldbogen JA, Cade DE, Wisniewska DM, Potvin J, Segre PS, Savoca MS, Hazen EL, Czapanskiy MF, Kahane-Rapport SR, DeRuiter SL, Gero S, Tønnesen P, Gough WT, Hanson MB, Holt MM, Jensen FH, Simon M, Stimpert AK, Arranz P, Johnston DW, Nowacek DP, Parks SE, Visser F, Friedlaender AS, Tyack PL, Madsen PT, Pyenson ND. Why whales are big but not bigger: Physiological drivers and ecological limits in the age of ocean giants. Science 2020; 366:1367-1372. [PMID: 31831666 DOI: 10.1126/science.aax9044] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 10/31/2019] [Indexed: 12/27/2022]
Abstract
The largest animals are marine filter feeders, but the underlying mechanism of their large size remains unexplained. We measured feeding performance and prey quality to demonstrate how whale gigantism is driven by the interplay of prey abundance and harvesting mechanisms that increase prey capture rates and energy intake. The foraging efficiency of toothed whales that feed on single prey is constrained by the abundance of large prey, whereas filter-feeding baleen whales seasonally exploit vast swarms of small prey at high efficiencies. Given temporally and spatially aggregated prey, filter feeding provides an evolutionary pathway to extremes in body size that are not available to lineages that must feed on one prey at a time. Maximum size in filter feeders is likely constrained by prey availability across space and time.
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Affiliation(s)
- J A Goldbogen
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA.
| | - D E Cade
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA
| | - D M Wisniewska
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA
| | - J Potvin
- Department of Physics, Saint Louis University, St. Louis, MO, USA
| | - P S Segre
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA
| | - M S Savoca
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA
| | - E L Hazen
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA.,Environmental Research Division, National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA, USA.,Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA, USA
| | - M F Czapanskiy
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA
| | - S R Kahane-Rapport
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA
| | - S L DeRuiter
- Mathematics and Statistics Department, Calvin University, Grand Rapids, MI, USA
| | - S Gero
- Zoophysiology, Department of Bioscience, Aarhus University, Aarhus, Denmark
| | - P Tønnesen
- Zoophysiology, Department of Bioscience, Aarhus University, Aarhus, Denmark
| | - W T Gough
- Hopkins Marine Station, Department of Biology, Stanford University, Pacific Grove, CA, USA
| | - M B Hanson
- Conservation Biology Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, USA
| | - M M Holt
- Conservation Biology Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, USA
| | - F H Jensen
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
| | - M Simon
- Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland
| | - A K Stimpert
- Moss Landing Marine Laboratories, Moss Landing, CA, USA
| | - P Arranz
- Biodiversity, Marine Ecology and Conservation Group, Department of Animal Biology, University of La Laguna, La Laguna, Spain
| | - D W Johnston
- Nicholas School of the Environment, Duke University Marine Laboratory, Beaufort, NC, USA
| | - D P Nowacek
- Pratt School of Engineering, Duke University, Durham, NC, USA
| | - S E Parks
- Department of Biology, Syracuse University, Syracuse, NY, USA
| | - F Visser
- Department of Freshwater and Marine Ecology, IBED, University of Amsterdam, Amsterdam, Netherlands.,Department of Coastal Systems, NIOZ and Utrecht University, Utrecht, Netherlands.,Kelp Marine Research, Hoorn, Netherlands
| | - A S Friedlaender
- Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA, USA
| | - P L Tyack
- Sea Mammal Research Unit, School of Biology, Scottish Oceans Institute, University of St Andrews, St Andrews, UK
| | - P T Madsen
- Zoophysiology, Department of Bioscience, Aarhus University, Aarhus, Denmark.,Aarhus Institute of Advanced Studies, Aarhus University, DK-8000 Aarhus C, Denmark
| | - N D Pyenson
- Department of Paleobiology, National Museum of Natural History, Washington, DC, USA.,Department of Paleontology and Geology, Burke Museum of Natural History and Culture, Seattle, WA, USA
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10
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Rose J, Visser F, Müller B, Senft M, Groscurth S, Sicking KF, Twyman RM, Prüfer D, Noll GA. Identification and molecular analysis of interaction sites in the MtSEO-F1 protein involved in forisome assembly. Int J Biol Macromol 2019; 144:603-614. [PMID: 31843608 DOI: 10.1016/j.ijbiomac.2019.12.092] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 12/11/2019] [Accepted: 12/11/2019] [Indexed: 11/26/2022]
Abstract
Forisomes are large mechanoprotein complexes found solely in legumes such as Medicago truncatula. They comprise several "sieve element occlusion by forisome" (SEO-F) subunits, with MtSEO-F1 as the major structure-forming component. SEO-F proteins possess three conserved domains -an N-terminal domain (SEO-NTD), a potential thioredoxin fold, and a C-terminal domain (SEO-CTD)- but structural and biochemical data are scarce and little is known about the contribution of these domains to forisome assembly. To identify key amino acids involved in MtSEO-F1 dimerization and complex formation, we investigated protein-protein interactions by bimolecular fluorescence complementation and the analysis of yeast two-hybrid and random mutagenesis libraries. We identified a SEO-NTD core region as the major dimerization site, with abundant hydrophobic residues and rare charged residues suggesting dimerization is driven by the hydrophobic effect. We also found that ~45% of the full-length MtSEO-F1 sequence must be conserved for higher-order protein assembly, indicating that large interaction surfaces facilitate stable interactions, contributing to the high resilience of forisome bodies. Interestingly, the removal of 62 amino acids from the C-terminus did not disrupt forisome assembly. This is the first study unraveling interaction sites and mechanisms within the MtSEO-F1 protein at the level of dimerization and complex formation.
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Affiliation(s)
- Judith Rose
- Institute for Plant Biology and Biotechnology, University of Münster, Schlossplatz 8, 48143 Münster, Germany
| | - Franziska Visser
- Institute for Plant Biology and Biotechnology, University of Münster, Schlossplatz 8, 48143 Münster, Germany
| | - Boje Müller
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Schlossplatz 8, 48143 Münster, Germany
| | - Matthias Senft
- Leibniz Institute for Agricultural Engineering and Bioeconomy, Max-Eyth-Allee 100, 14469 Potsdam, Germany
| | - Sira Groscurth
- Stem Cell Network North Rhine-Westphalia, Merowingerplatz 1, 40225 Düsseldorf, Germany
| | - Kevin F Sicking
- Institute for Plant Biology and Biotechnology, University of Münster, Schlossplatz 8, 48143 Münster, Germany
| | | | - Dirk Prüfer
- Institute for Plant Biology and Biotechnology, University of Münster, Schlossplatz 8, 48143 Münster, Germany; Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Schlossplatz 8, 48143 Münster, Germany
| | - Gundula A Noll
- Institute for Plant Biology and Biotechnology, University of Münster, Schlossplatz 8, 48143 Münster, Germany; Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Schlossplatz 8, 48143 Münster, Germany.
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11
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Verhoeven K, Houben R, Limpens K, Velders M, Visser F, Vilches-Freixas G, Ares C, Bosmans G, Boersma L. EP-1304 What is the benefit of using more beams and/or non-coplanar beams in breast PBS proton therapy? Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31724-4] [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: 11/16/2022]
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12
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Zijlstra HW, Mulder AHL, Geeraedts F, Visser F. Falsely positive anti-glomerular basement membrane antibodies in a patient with hantavirus induced acute kidney injury - a case report. BMC Nephrol 2018; 19:286. [PMID: 30348108 PMCID: PMC6198376 DOI: 10.1186/s12882-018-1082-3] [Citation(s) in RCA: 4] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 10/08/2018] [Indexed: 11/10/2022] Open
Abstract
Background Hantavirus infection is an uncommon cause of acute renal failure with massive proteinuria. Serology tests to support a presumptive diagnosis usually take a few days. During the initial work-up, autoimmune causes including anti-glomerular basement membrane (GBM) glomerulonephritis need to be excluded, because these require urgent therapy. In this case the delay in serological testing caused a dilemma in treatment initiation. Case presentation An 18-year-old patient was admitted to the hospital with acute renal failure, erythrocyturia and massive proteinuria. Routine blood analysis showed leucocytosis (40,5 × 109/l) and a serum creatinine of 233 μmol/l. Infectious causes, e.g. leptospirosis or hantavirus infection, or an autoimmune disease, e.g., AAV or anti-GBM glomerulonephritis was the most feasible underlying diagnosis. Before hantavirus serology results were known, anti-GBM antibodies were positive. Treatment for anti-GBM glomerulonephritis was withheld, because of the absence of other signs and symptoms of the disease and slight improvement of renal function. The diagnosis of acute hantavirus infection was later on confirmed, by seroconversion of a follow-up serum sample. Without further intervention renal function recovered and anti-GBM antibodies disappeared. Conclusion Hantavirus infection may induce anti-GBM antibodies, falsely suggestive of anti-GBM glomerulonephritis. Anti-GBM antibodies are supposed to be 100% specific. No earlier reports of false positive anti-GBM titers were reported. Nevertheless, the anti-GBM antibodies in this case were seen as an innocent bystander effect. Considering the need of urgent initiation of plasmapheresis and administration of immunosuppressants it may lead to diagnostic dilemmas with crucial therapeutic consequences. Knowledge of this anomaly when diagnosing acute renal failure, is very important.
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Affiliation(s)
- H W Zijlstra
- Ziekenhuisgroep Twente, Department of Nephrology, Almelo, The Netherlands.
| | - A H L Mulder
- Medlon, Department of Clinical Chemistry, Almelo, The Netherlands
| | - F Geeraedts
- Laboratory for Medical Microbiology and Public Health, Hengelo, The Netherlands
| | - F Visser
- Ziekenhuisgroep Twente, Department of Nephrology, Almelo, The Netherlands
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13
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Kleinloog R, Zwanenburg JJM, Schermers B, Krikken E, Ruigrok YM, Luijten PR, Visser F, Regli L, Rinkel GJE, Verweij BH. Quantification of Intracranial Aneurysm Volume Pulsation with 7T MRI. AJNR Am J Neuroradiol 2018; 39:713-719. [PMID: 29472302 DOI: 10.3174/ajnr.a5546] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 11/30/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Aneurysm volume pulsation is a potential predictor of intracranial aneurysm rupture. We evaluated whether 7T MR imaging can quantify aneurysm volume pulsation. MATERIALS AND METHODS In Stage I of the study, 10 unruptured aneurysms in 9 patients were studied using a high-resolution (0.6-mm, isotropic) 3D gradient-echo sequence with cardiac gating. Semiautomatic segmentation was used to measure aneurysm volume (in cubic millimeters) per cardiac phase. Aneurysm pulsation was defined as the relative increase in volume between the phase with the smallest volume and the phase with the largest volume. The accuracy and precision of the measured volume pulsations were addressed by digital phantom simulations and a repeat image analysis. In Stage II, the imaging protocol was optimized and 9 patients with 9 aneurysms were studied with and without administration of a contrast agent. RESULTS The mean aneurysm pulsation in Stage I was 8% ± 7% (range, 2%-27%), with a mean volume change of 15 ± 14 mm3 (range, 3-51 mm3). The mean difference in volume change for the repeat image analysis was 2 ± 6 mm3. The artifactual volume pulsations measured with the digital phantom simulations were of the same magnitude as the volume pulsations observed in the patient data, even after protocol optimization in Stage II. CONCLUSIONS Volume pulsation quantification with the current imaging protocol on 7T MR imaging is not accurate due to multiple imaging artifacts. Future studies should always include aneurysm-specific accuracy analysis.
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Affiliation(s)
- R Kleinloog
- From the Department of Neurology and Neurosurgery (R.K., B.S., E.K., Y.M.R., L.R., G.J.E.R., B.H.V.), Brain Center Rudolf Magnus
| | - J J M Zwanenburg
- Department of Radiology (J.J.M.Z., P.R.L., F.V.), Utrecht University, University Medical Center Utrecht, Utrecht, the Netherlands
| | - B Schermers
- From the Department of Neurology and Neurosurgery (R.K., B.S., E.K., Y.M.R., L.R., G.J.E.R., B.H.V.), Brain Center Rudolf Magnus.,Department of Technical Medicine (B.S., E.K.), Faculty of Science and Technology, University of Twente, Enschede, the Netherlands
| | - E Krikken
- From the Department of Neurology and Neurosurgery (R.K., B.S., E.K., Y.M.R., L.R., G.J.E.R., B.H.V.), Brain Center Rudolf Magnus.,Department of Technical Medicine (B.S., E.K.), Faculty of Science and Technology, University of Twente, Enschede, the Netherlands
| | - Y M Ruigrok
- From the Department of Neurology and Neurosurgery (R.K., B.S., E.K., Y.M.R., L.R., G.J.E.R., B.H.V.), Brain Center Rudolf Magnus
| | - P R Luijten
- Department of Radiology (J.J.M.Z., P.R.L., F.V.), Utrecht University, University Medical Center Utrecht, Utrecht, the Netherlands
| | - F Visser
- Department of Radiology (J.J.M.Z., P.R.L., F.V.), Utrecht University, University Medical Center Utrecht, Utrecht, the Netherlands.,Philips Healthcare (F.V.), Best, the Netherlands
| | - L Regli
- From the Department of Neurology and Neurosurgery (R.K., B.S., E.K., Y.M.R., L.R., G.J.E.R., B.H.V.), Brain Center Rudolf Magnus.,Department of Neurosurgery (L.R.), University Hospital Zurich, Zurich, Switzerland
| | - G J E Rinkel
- From the Department of Neurology and Neurosurgery (R.K., B.S., E.K., Y.M.R., L.R., G.J.E.R., B.H.V.), Brain Center Rudolf Magnus
| | - B H Verweij
- From the Department of Neurology and Neurosurgery (R.K., B.S., E.K., Y.M.R., L.R., G.J.E.R., B.H.V.), Brain Center Rudolf Magnus
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14
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Isojunno S, Sadykova D, DeRuiter S, Curé C, Visser F, Thomas L, Miller PJO, Harris CM. Individual, ecological, and anthropogenic influences on activity budgets of long‐finned pilot whales. Ecosphere 2017. [DOI: 10.1002/ecs2.2044] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- S. Isojunno
- Sea Mammal Research Unit Scottish Oceans Institute University of St Andrews St Andrews, Fife KY16 8LB UK
- Centre for Research into Ecological & Environmental Modelling (CREEM) The Observatory, Buchanan Gardens University of St Andrews St Andrews, Fife KY169LZ UK
| | - D. Sadykova
- Institute of Biological and Environmental Sciences School of Biological Sciences University of Aberdeen Tillydrone Avenue Aberdeen AB24 2TZ UK
- School of Biological Sciences Queen's University Belfast 97 Lisburn Road Belfast BT9 7BL UK
| | - S. DeRuiter
- Mathematics and Statistics Department Calvin College Grand Rapids Michigan 49546 USA
| | - C. Curé
- Cerema, DTer Est Acoustics Group F‐67035 Strasbourg Cedex 2 France
| | - F. Visser
- Kelp Marine Research Loniusstraat 9 1624 CJ Hoorn The Netherlands
- Behavioural Biology Institute of Biology Leiden University P.O. Box 9505 2300 RA Leiden The Netherlands
| | - L. Thomas
- Centre for Research into Ecological & Environmental Modelling (CREEM) The Observatory, Buchanan Gardens University of St Andrews St Andrews, Fife KY169LZ UK
| | - P. J. O. Miller
- Sea Mammal Research Unit Scottish Oceans Institute University of St Andrews St Andrews, Fife KY16 8LB UK
| | - C. M. Harris
- Centre for Research into Ecological & Environmental Modelling (CREEM) The Observatory, Buchanan Gardens University of St Andrews St Andrews, Fife KY169LZ UK
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15
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van Kalleveen IML, Hoogendam JP, Raaijmakers AJE, Visser F, Arteaga de Castro CS, Verheijen RHM, Luijten PR, Zweemer RP, Veldhuis WB, Klomp DWJ. Boosting the SNR by adding a receive-only endorectal monopole to an external antenna array for high-resolution, T 2 -weighted imaging of early-stage cervical cancer with 7-T MRI. NMR Biomed 2017; 30:e3750. [PMID: 28574604 DOI: 10.1002/nbm.3750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 04/18/2017] [Accepted: 04/19/2017] [Indexed: 06/07/2023]
Abstract
The aim of this study was to investigate the signal-to-noise ratio (SNR) gain in early-stage cervical cancer at ultrahigh-field MRI (e.g. 7 T) using a combination of multiple external antennas and a single endorectal antenna. In particular, we used an endorectal monopole antenna to increase the SNR in cervical magnetic resonance imaging (MRI). This should allow high-resolution, T2 -weighted imaging and magnetic resonance spectroscopy (MRS) for metabolic staging, which could facilitate the local tumor status assessment. In a prospective feasibility study, five healthy female volunteers and six patients with histologically proven stage IB1-IIB cervical cancer were scanned at 7 T. We used seven external fractionated dipole antennas for transmit-receive (transceive) and an endorectally placed monopole antenna for reception only. A region of interest, containing both normal cervix and tumor tissue, was selected for the SNR measurement. Separated signal and noise measurements were obtained in the region of the cervix for each element and in the near field of the monopole antenna (radius < 30 mm) to calculate the SNR gain of the endorectal antenna in each patient. We obtained high-resolution, T2 -weighted images with a voxel size of 0.7 × 0.8 × 3.0 mm3 . In four cases with optimal placement of the endorectal antenna (verified on the T2 -weighted images), a mean gain of 2.2 in SNR was obtained at the overall cervix and tumor tissue area. Within a radius of 30 mm from the monopole antenna, a mean SNR gain of 3.7 was achieved in the four optimal cases. Overlap between the two different regions of the SNR calculations was around 24%. We have demonstrated that the use of an endorectal monopole antenna substantially increases the SNR of 7-T MRI at the cervical anatomy. Combined with the intrinsically high SNR of ultrahigh-field MRI, this gain may be employed to obtain metabolic information using MRS and to enhance spatial resolutions to assess tumor invasion.
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Affiliation(s)
| | - J P Hoogendam
- Department of Gynaecological Oncology, UMC Utrecht Cancer Centre, the Netherlands
| | | | - F Visser
- Department of Radiology, UMC Utrecht, the Netherlands
| | | | - R H M Verheijen
- Department of Gynaecological Oncology, UMC Utrecht Cancer Centre, the Netherlands
| | - P R Luijten
- Department of Radiology, UMC Utrecht, the Netherlands
| | - R P Zweemer
- Department of Gynaecological Oncology, UMC Utrecht Cancer Centre, the Netherlands
| | - W B Veldhuis
- Department of Radiology, UMC Utrecht, the Netherlands
| | - D W J Klomp
- Department of Radiology, UMC Utrecht, the Netherlands
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16
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Bousquet J, Bewick M, Cano A, Eklund P, Fico G, Goswami N, Guldemond NA, Henderson D, Hinkema MJ, Liotta G, Mair A, Molloy W, Monaco A, Monsonis-Paya I, Nizinska A, Papadopoulos H, Pavlickova A, Pecorelli S, Prados-Torres A, Roller-Wirnsberger RE, Somekh D, Vera-Muñoz C, Visser F, Farrell J, Malva J, Andersen Ranberg K, Camuzat T, Carriazo AM, Crooks G, Gutter Z, Iaccarino G, Manuel de Keenoy E, Moda G, Rodriguez-Mañas L, Vontetsianos T, Abreu C, Alonso J, Alonso-Bouzon C, Ankri J, Arredondo MT, Avolio F, Bedbrook A, Białoszewski AZ, Blain H, Bourret R, Cabrera-Umpierrez MF, Catala A, O'Caoimh R, Cesari M, Chavannes NH, Correia-da-Sousa J, Dedeu T, Ferrando M, Ferri M, Fokkens WJ, Garcia-Lizana F, Guérin O, Hellings PW, Haahtela T, Illario M, Inzerilli MC, Lodrup Carlsen KC, Kardas P, Keil T, Maggio M, Mendez-Zorrilla A, Menditto E, Mercier J, Michel JP, Murray R, Nogues M, O'Byrne-Maguire I, Pappa D, Parent AS, Pastorino M, Robalo-Cordeiro C, Samolinski B, Siciliano P, Teixeira AM, Tsartara SI, Valiulis A, Vandenplas O, Vasankari T, Vellas B, Vollenbroek-Hutten M, Wickman M, Yorgancioglu A, Zuberbier T, Barbagallo M, Canonica GW, Klimek L, Maggi S, Aberer W, Akdis C, Adcock IM, Agache I, Albera C, Alonso-Trujillo F, Angel Guarcia M, Annesi-Maesano I, Apostolo J, Arshad SH, Attalin V, Avignon A, Bachert C, Baroni I, Bel E, Benson M, Bescos C, Blasi F, Barbara C, Bergmann KC, Bernard PL, Bonini S, Bousquet PJ, Branchini B, Brightling CE, Bruguière V, Bunu C, Bush A, Caimmi DP, Calderon MA, Canovas G, Cardona V, Carlsen KH, Cesario A, Chkhartishvili E, Chiron R, Chivato T, Chung KF, d'Angelantonio M, De Carlo G, Cholley D, Chorin F, Combe B, Compas B, Costa DJ, Costa E, Coste O, Coupet AL, Crepaldi G, Custovic A, Dahl R, Dahlen SE, Demoly P, Devillier P, Didier A, Dinh-Xuan AT, Djukanovic R, Dokic D, Du Toit G, Dubakiene R, Dupeyron A, Emuzyte R, Fiocchi A, Wagner A, Fletcher M, Fonseca J, Fougère B, Gamkrelidze A, Garces G, Garcia-Aymeric J, Garcia-Zapirain B, Gemicioğlu B, Gouder C, Hellquist-Dahl B, Hermosilla-Gimeno I, Héve D, Holland C, Humbert M, Hyland M, Johnston SL, Just J, Jutel M, Kaidashev IP, Khaitov M, Kalayci O, Kalyoncu AF, Keijser W, Kerstjens H, Knezović J, Kowalski M, Koppelman GH, Kotska T, Kovac M, Kull I, Kuna P, Kvedariene V, Lepore V, MacNee W, Maggio M, Magnan A, Majer I, Manning P, Marcucci M, Marti T, Masoli M, Melen E, Miculinic N, Mihaltan F, Milenkovic B, Millot-Keurinck J, Mlinarić H, Momas I, Montefort S, Morais-Almeida M, Moreno-Casbas T, Mösges R, Mullol J, Nadif R, Nalin M, Navarro-Pardo E, Nekam K, Ninot G, Paccard D, Pais S, Palummeri E, Panzner P, Papadopoulos NK, Papanikolaou C, Passalacqua G, Pastor E, Perrot M, Plavec D, Popov TA, Postma DS, Price D, Raffort N, Reuzeau JC, Robine JM, Rodenas F, Robusto F, Roche N, Romano A, Romano V, Rosado-Pinto J, Roubille F, Ruiz F, Ryan D, Salcedo T, Schmid-Grendelmeier P, Schulz H, Schunemann HJ, Serrano E, Sheikh A, Shields M, Siafakas N, Scichilone N, Siciliano P, Skrindo I, Smit HA, Sourdet S, Sousa-Costa E, Spranger O, Sooronbaev T, Sruk V, Sterk PJ, Todo-Bom A, Touchon J, Tramontano D, Triggiani M, Tsartara SI, Valero AL, Valovirta E, van Ganse E, van Hage M, van den Berge M, Vandenplas O, Ventura MT, Vergara I, Vezzani G, Vidal D, Viegi G, Wagemann M, Whalley B, Wickman M, Wilson N, Yiallouros PK, Žagar M, Zaidi A, Zidarn M, Hoogerwerf EJ, Usero J, Zuffada R, Senn A, de Oliveira-Alves B. Building Bridges for Innovation in Ageing: Synergies between Action Groups of the EIP on AHA. J Nutr Health Aging 2017; 21:92-104. [PMID: 27999855 DOI: 10.1007/s12603-016-0803-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Accepted: 04/12/2016] [Indexed: 01/08/2023]
Abstract
The Strategic Implementation Plan of the European Innovation Partnership on Active and Healthy Ageing (EIP on AHA) proposed six Action Groups. After almost three years of activity, many achievements have been obtained through commitments or collaborative work of the Action Groups. However, they have often worked in silos and, consequently, synergies between Action Groups have been proposed to strengthen the triple win of the EIP on AHA. The paper presents the methodology and current status of the Task Force on EIP on AHA synergies. Synergies are in line with the Action Groups' new Renovated Action Plan (2016-2018) to ensure that their future objectives are coherent and fully connected. The outcomes and impact of synergies are using the Monitoring and Assessment Framework for the EIP on AHA (MAFEIP). Eight proposals for synergies have been approved by the Task Force: Five cross-cutting synergies which can be used for all current and future synergies as they consider overarching domains (appropriate polypharmacy, citizen empowerment, teaching and coaching on AHA, deployment of synergies to EU regions, Responsible Research and Innovation), and three cross-cutting synergies focussing on current Action Group activities (falls, frailty, integrated care and chronic respiratory diseases).
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Affiliation(s)
- J Bousquet
- Professor Jean Bousquet, CHRU, 371 Avenue du Doyen Gaston Giraud, 34295 Montpellier Cedex 5, France, Tel +33 611 42 88 47,
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Bousquet J, Bewick M, Cano A, Eklund P, Fico G, Goswami N, Guldemond NA, Henderson D, Hinkema MJ, Liotta G, Mair A, Molloy W, Monaco A, Monsonis-Paya I, Nizinska A, Papadopoulos H, Pavlickova A, Pecorelli S, Prados-Torres A, Roller-Wirnsberger RE, Somekh D, Vera-Muñoz C, Visser F, Farrell J, Malva J, Andersen Ranberg K, Camuzat T, Carriazo AM, Crooks G, Gutter Z, Iaccarino G, de Keenoy EM, Moda G, Rodriguez-Mañas L, Vontetsianos T, Abreu C, Alonso J, Alonso-Bouzon C, Ankri J, Arredondo MT, Avolio F, Bedbrook A, Białoszewski AZ, Blain H, Bourret R, Cabrera-Umpierrez MF, Catala A, O’Caoimh R, Cesari M, Chavannes NH, Correia-Da-Sousa J, Dedeu T, Ferrando M, Ferri M, Fokkens WJ, Garcia-Lizana F, Guérin O, Hellings PW, Haahtela T, Illario M, Inzerilli MC, Lodrup Carlsen KC, Kardas P, Keil T, Maggio M, Mendez-Zorrilla A, Menditto E, Mercier J, Michel JP, Murray R, Nogues M, O’Byrne-Maguire I, Pappa D, Parent AS, Pastorino M, Robalo-Cordeiro C, Samolinski B, Siciliano P, Teixeira AM, Tsartara SI, Valiulis A, Vandenplas O, Vasankari T, Vellas B, Vollenbroek-Hutten M, Wickman M, Yorgancioglu A, Zuberbier T, Barbagallo M, Canonica GW, Klimek L, Maggi S, Aberer W, Akdis C, Adcock IM, Agache I, Albera C, Alonso-Trujillo F, Angel Guarcia M, Annesi-Maesano I, Apostolo J, Arshad SH, Attalin V, Avignon A, Bachert C, Baroni I, Bel E, Benson M, Bescos C, Blasi F, Barbara C, Bergmann KC, Bernard PL, Bonini S, Bousquet PJ, Branchini B, Brightling CE, Bruguière V, Bunu C, Bush A, Caimmi DP, Calderon MA, Canovas G, Cardona V, Carlsen KH, Cesario A, Chkhartishvili E, Chiron R, Chivato T, Chung KF, D’Angelantonio M, de Carlo G, Cholley D, Chorin F, Combe B, Compas B, Costa DJ, Costa E, Coste O, Coupet AL, Crepaldi G, Custovic A, Dahl R, Dahlen SE, Demoly P, Devillier P, Didier A, Dinh-Xuan AT, Djukanovic R, Dokic D, du Toit G, Dubakiene R, Dupeyron A, Emuzyte R, Fiocchi A, Wagner A, Fletcher M, Fonseca J, Fougère B, Gamkrelidze A, Garces G, Garcia-Aymeric J, Garcia-Zapirain B, Gemicioğlu B, Gouder C, Hellquist-Dahl B, Hermosilla-Gimeno I, Héve D, Holland C, Humbert M, Hyland M, Johnston SL, Just J, Jutel M, Kaidashev IP, Khaitov M, Kalayci O, Kalyoncu AF, Keijser W, Kerstjens H, Knezović J, Kowalski M, Koppelman GH, Kotska T, Kovac M, Kull I, Kuna P, Kvedariene V, Lepore V, Macnee W, Maggio M, Magnan A, Majer I, Manning P, Marcucci M, Marti T, Masoli M, Melen E, Miculinic N, Mihaltan F, Milenkovic B, Millot-Keurinck J, Mlinarić H, Momas I, Montefort S, Morais-Almeida M, Moreno-Casbas T, Mösges R, Mullol J, Nadif R, Nalin M, Navarro-Pardo E, Nekam K, Ninot G, Paccard D, Pais S, Palummeri E, Panzner P, Papadopoulos NK, Papanikolaou C, Passalacqua G, Pastor E, Perrot M, Plavec D, Popov TA, Postma DS, Price D, Raffort N, Reuzeau JC, Robine JM, Rodenas F, Robusto F, Roche N, Romano A, Romano V, Rosado-Pinto J, Roubille F, Ruiz F, Ryan D, Salcedo T, Schmid-Grendelmeier P, Schulz H, Schunemann HJ, Serrano E, Sheikh A, Shields M, Siafakas N, Scichilone N, Siciliano P, Skrindo I, Smit HA, Sourdet S, Sousa-Costa E, Spranger O, Sooronbaev T, Sruk V, Sterk PJ, Todo-Bom A, Touchon J, Tramontano D, Triggiani M, Tsartara SI, Valero AL, Valovirta E, van Ganse E, van Hage M, van den Berge M, Vandenplas O, Ventura MT, Vergara I, Vezzani G, Vidal D, Viegi G, Wagemann M, Whalley B, Wickman M, Wilson N, Yiallouros PK, Žagar M, Zaidi A, Zidarn M, Hoogerwerf EJ, Usero J, Zuffada R, Senn A, de Oliveira-Alves B. Erratum to: Building bridges for innovation in ageing: Synergies between action groups of the EIP on AHA. J Nutr Health Aging 2016. [DOI: 10.1007/s12603-016-0850-7] [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: 11/28/2022]
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Curé C, Isojunno S, Visser F, Wensveen PJ, Sivle LD, Kvadsheim PH, Lam FPA, Miller PJO. Biological significance of sperm whale responses to sonar: comparison with anti-predator responses. ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00748] [Citation(s) in RCA: 20] [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: 11/23/2022] Open
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Visser F, Müller B, Rose J, Prüfer D, Noll GA. Forizymes - functionalised artificial forisomes as a platform for the production and immobilisation of single enzymes and multi-enzyme complexes. Sci Rep 2016; 6:30839. [PMID: 27502156 PMCID: PMC4977538 DOI: 10.1038/srep30839] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 07/11/2016] [Indexed: 01/27/2023] Open
Abstract
The immobilisation of enzymes plays an important role in many applications, including biosensors that require enzyme activity, stability and recyclability in order to function efficiently. Here we show that forisomes (plant-derived mechanoproteins) can be functionalised with enzymes by translational fusion, leading to the assembly of structures designated as forizymes. When forizymes are expressed in the yeast Saccharomyces cerevisiae, the enzymes are immobilised by the self-assembly of forisome subunits to form well-structured protein bodies. We used glucose-6-phosphate dehydrogenase (G6PDH) and hexokinase 2 (HXK2) as model enzymes for the one-step production and purification of catalytically active forizymes. These structures retain the typical stimulus-response reaction of the forisome and the enzyme remains active even after multiple assay cycles, which we demonstrated using G6PDH forizymes as an example. We also achieved the co-incorporation of both HXK2 and G6PDH in a single forizyme, facilitating a two-step reaction cascade that was 30% faster than the coupled reaction using the corresponding enzymes on different forizymes or in solution. Our novel forizyme immobilisation technique therefore not only combines the sensory properties of forisome proteins with the catalytic properties of enzymes but also allows the development of multi-enzyme complexes for incorporation into technical devices.
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Affiliation(s)
- Franziska Visser
- University of Münster, Institute of Plant Biology and Biotechnology, Münster, 48143, Germany
| | - Boje Müller
- University of Münster, Institute of Plant Biology and Biotechnology, Münster, 48143, Germany
| | - Judith Rose
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Münster, 48143, Germany
| | - Dirk Prüfer
- University of Münster, Institute of Plant Biology and Biotechnology, Münster, 48143, Germany.,Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Münster, 48143, Germany
| | - Gundula A Noll
- University of Münster, Institute of Plant Biology and Biotechnology, Münster, 48143, Germany
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Arranz P, DeRuiter SL, Stimpert AK, Neves S, Friedlaender AS, Goldbogen JA, Visser F, Calambokidis J, Southall BL, Tyack PL. Discrimination of fast click-series produced by tagged Risso's dolphins (Grampus griseus) for echolocation or communication. ACTA ACUST UNITED AC 2016; 219:2898-2907. [PMID: 27401759 DOI: 10.1242/jeb.144295] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 07/05/2016] [Indexed: 11/20/2022]
Abstract
Early studies that categorized odontocete pulsed sounds had few means of discriminating signals used for biosonar-based foraging from those used for communication. This capability to identify the function of sounds is important for understanding and interpreting behavior; it is also essential for monitoring and mitigating potential disturbance from human activities. Archival tags were placed on free-ranging Grampus griseus to quantify and discriminate between pulsed sounds used for echolocation-based foraging and those used for communication. Two types of rapid click-series pulsed sounds, buzzes and burst pulses, were identified as produced by the tagged dolphins and classified using a Gaussian mixture model based on their duration, association with jerk (i.e. rapid change of acceleration) and temporal association with click trains. Buzzes followed regular echolocation clicks and coincided with a strong jerk signal from accelerometers on the tag. They consisted of series averaging 359±210 clicks (mean±s.d.) with an increasing repetition rate and relatively low amplitude. Burst pulses consisted of relatively short click series averaging 45±54 clicks with decreasing repetition rate and longer inter-click interval that were less likely to be associated with regular echolocation and the jerk signal. These results suggest that the longer, relatively lower amplitude, jerk-associated buzzes are used in this species to capture prey, mostly during the bottom phase of foraging dives, as seen in other odontocetes. In contrast, the shorter, isolated burst pulses that are generally emitted by the dolphins while at or near the surface are used outside of a direct, known foraging context.
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Affiliation(s)
- P Arranz
- Sea Mammal Research Unit, School of Biology, University of St Andrews, St Andrews KY16 8LB, UK
| | - S L DeRuiter
- Centre for Research into Ecological and Environmental Modelling, School of Mathematics and Statistics, University of St Andrews, St Andrews KY16 9LZ, UK Department of Mathematics and Statistics, Calvin College, Grand Rapids, MI 49546, USA
| | - A K Stimpert
- Vertebrate Ecology Lab, Moss Landing Marine Laboratories, Moss Landing, CA 95039, USA
| | - S Neves
- Sea Mammal Research Unit, School of Biology, University of St Andrews, St Andrews KY16 8LB, UK
| | - A S Friedlaender
- Department of Fisheries and Wildlife, Mammal Institute, Hatfield Marine Science Center, Oregon State University, Newport, OR 97635, USA
| | - J A Goldbogen
- Hopkins Marine Station, Stanford University, Pacific Grove, CA 93950, USA
| | - F Visser
- Kelp Marine Research, Hoorn 1624 CJ, The Netherlands Institute of Biology, Leiden University, Leiden 2311, The Netherlands
| | | | - B L Southall
- Southall Environmental Associates, Aptos, CA 95003, USA University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - P L Tyack
- Sea Mammal Research Unit, School of Biology, University of St Andrews, St Andrews KY16 8LB, UK
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Miller PJO, Kvadsheim PH, Lam FPA, Tyack PL, Curé C, DeRuiter SL, Kleivane L, Sivle LD, van IJsselmuide SP, Visser F, Wensveen PJ, von Benda-Beckmann AM, Martín López LM, Narazaki T, Hooker SK. First indications that northern bottlenose whales are sensitive to behavioural disturbance from anthropogenic noise. R Soc Open Sci 2015; 2:140484. [PMID: 26543576 PMCID: PMC4632540 DOI: 10.1098/rsos.140484] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 05/08/2015] [Indexed: 05/17/2023]
Abstract
Although northern bottlenose whales were the most heavily hunted beaked whale, we have little information about this species in its remote habitat of the North Atlantic Ocean. Underwater anthropogenic noise and disruption of their natural habitat may be major threats, given the sensitivity of other beaked whales to such noise disturbance. We attached dataloggers to 13 northern bottlenose whales and compared their natural sounds and movements to those of one individual exposed to escalating levels of 1-2 kHz upsweep naval sonar signals. At a received sound pressure level (SPL) of 98 dB re 1 μPa, the whale turned to approach the sound source, but at a received SPL of 107 dB re 1 μPa, the whale began moving in an unusually straight course and then made a near 180° turn away from the source, and performed the longest and deepest dive (94 min, 2339 m) recorded for this species. Animal movement parameters differed significantly from baseline for more than 7 h until the tag fell off 33-36 km away. No clicks were emitted during the response period, indicating cessation of normal echolocation-based foraging. A sharp decline in both acoustic and visual detections of conspecifics after exposure suggests other whales in the area responded similarly. Though more data are needed, our results indicate high sensitivity of this species to acoustic disturbance, with consequent risk from marine industrialization and naval activity.
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Affiliation(s)
- P. J. O. Miller
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY16 8LB, UK
- Author for correspondence: P. J. O. Miller e-mail:
| | - P. H. Kvadsheim
- Maritime Systems Division, Norwegian Defence Research Establishment (FFI), Horten 3191, Norway
| | - F. P. A. Lam
- Acoustics and Sonar, Netherlands Organisation for Applied Scientific Research (TNO), PO Box 96864, 2509 JG The Hague, The Netherlands
| | - P. L. Tyack
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY16 8LB, UK
| | - C. Curé
- Acoustic Group, Centre for Expertise and Engineering on Risks, Urban and Country Planning, Environment and Mobility (CEREMA - DTer Est), F 67035 Strasbourg cedex2, France
| | - S. L. DeRuiter
- Centre for Research into Ecological and Environmental Modelling, University of St Andrews, St Andrews, Fife KY16 9LZ, UK
| | - L. Kleivane
- Maritime Systems Division, Norwegian Defence Research Establishment (FFI), Horten 3191, Norway
| | - L. D. Sivle
- Institute of Marine Research (IMR), PO Box 1870 Nordnes, Bergen 5817, Norway
| | - S. P. van IJsselmuide
- Acoustics and Sonar, Netherlands Organisation for Applied Scientific Research (TNO), PO Box 96864, 2509 JG The Hague, The Netherlands
| | - F. Visser
- Kelp Marine Research, Loniusstraat 9, 1624 CJ Hoorn, The Netherlands
- Behavioural Biology Group, Leiden University, PO Box 9505, 2300 RA Leiden, The Netherlands
| | - P. J. Wensveen
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY16 8LB, UK
| | - A. M. von Benda-Beckmann
- Acoustics and Sonar, Netherlands Organisation for Applied Scientific Research (TNO), PO Box 96864, 2509 JG The Hague, The Netherlands
| | - L. M. Martín López
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY16 8LB, UK
| | - T. Narazaki
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY16 8LB, UK
| | - S. K. Hooker
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY16 8LB, UK
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van der Kolk AG, Zwanenburg JJM, Denswil NP, Vink A, Spliet WGM, Daemen MJAP, Visser F, Klomp DWJ, Luijten PR, Hendrikse J. Imaging the intracranial atherosclerotic vessel wall using 7T MRI: initial comparison with histopathology. AJNR Am J Neuroradiol 2014; 36:694-701. [PMID: 25477359 DOI: 10.3174/ajnr.a4178] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 08/30/2014] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND PURPOSE Several studies have attempted to characterize intracranial atherosclerotic plaques by using MR imaging sequences. However, dedicated validation of these sequences with histology has not yet been performed. The current study assessed the ability of ultra-high-resolution 7T MR imaging sequences with different image contrast weightings to image plaque components, by using histology as criterion standard. MATERIALS AND METHODS Five specimens of the circle of Wills were imaged at 7T with 0.11 × 0.11 mm in-plane-resolution proton attenuation-, T1-, T2-, and T2*-weighted sequences (through-plane resolution, 0.11-1 mm). Tissue samples from 13 fiducial-marked locations (per specimen) on MR imaging underwent histologic processing and atherosclerotic plaque classification. Reconstructed MR images were matched with histologic sections at corresponding locations. RESULTS Forty-four samples were available for subsequent evaluation of agreement or disagreement between plaque components and image contrast differences. Of samples, 52.3% (n = 23) showed no image contrast heterogeneity; this group comprised solely no lesions or early lesions. Of samples, 25.0% (n = 11, mostly advanced lesions) showed good correlation between the spatial organization of MR imaging heterogeneities and plaque components. Areas of foamy macrophages were generally seen as proton attenuation-, T2-, and T2*- hypointense areas, while areas of increased collagen content showed more ambiguous signal intensities. Five samples showed image-contrast heterogeneity without corresponding plaque components on histology; 5 other samples showed contrast heterogeneity based on intima-media artifacts. CONCLUSIONS MR imaging at 7T has the image contrast capable of identifying both focal intracranial vessel wall thickening and distinguishing areas of different signal intensities spatially corresponding to plaque components within more advanced atherosclerotic plaques.
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Affiliation(s)
| | - J J M Zwanenburg
- Radiology (A.G.v.d.K., J.J.M.Z., F.V., D.W.J.K., P.R.L., J.H.) Image Sciences Institute (J.J.M.Z.), University Medical Center Utrecht, Utrecht, the Netherlands
| | - N P Denswil
- Department of Pathology (N.P.D., M.J.A.P.D.), Academic Medical Center Amsterdam, Amsterdam, the Netherlands
| | - A Vink
- From the Departments of Pathology (A.V., W.G.M.S.)
| | - W G M Spliet
- From the Departments of Pathology (A.V., W.G.M.S.)
| | - M J A P Daemen
- Department of Pathology (N.P.D., M.J.A.P.D.), Academic Medical Center Amsterdam, Amsterdam, the Netherlands
| | - F Visser
- Radiology (A.G.v.d.K., J.J.M.Z., F.V., D.W.J.K., P.R.L., J.H.) Philips Healthcare (F.V.), Best, the Netherlands
| | - D W J Klomp
- Radiology (A.G.v.d.K., J.J.M.Z., F.V., D.W.J.K., P.R.L., J.H.)
| | - P R Luijten
- Radiology (A.G.v.d.K., J.J.M.Z., F.V., D.W.J.K., P.R.L., J.H.)
| | - J Hendrikse
- Radiology (A.G.v.d.K., J.J.M.Z., F.V., D.W.J.K., P.R.L., J.H.)
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Kilsdonk ID, Steenwijk MD, Pouwels PJW, Zwanenburg JJM, Visser F, Luijten PR, Geurts JJG, Barkhof F, Wattjes MP. Perivascular spaces in MS patients at 7 Tesla MRI: A marker of neurodegeneration? Mult Scler 2014; 21:155-62. [DOI: 10.1177/1352458514540358] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Background: Virchow-Robin spaces (VRS) are associated with vascular and neurodegenerative disease. In multiple sclerosis (MS), VRS have been associated with neuroinflammation. Ultra-high field imaging may be used to gain insight in these contradictory findings. Objective: The objective of this paper is to analyze VRS in MS patients using high-resolution 7 Tesla (T) MRI. Additionally, we investigated whether the widening of VRS is related to inflammatory or neurodegenerative aspects of MS. Methods: Thirty-four MS patients and 11 healthy controls were examined at 7T. Number and size of VRS were measured on three-dimensional (3D) T1-weighted images, and 3D fluid-attenuated inversion recovery (FLAIR) images were used for MS lesion detection. Brain atrophy was quantified by computing supratentorial brain volume fraction (sBVF). VRS counts were correlated with clinical variables, lesion count and sBVF. Results: MS patients displayed more VRS (median 11) than healthy controls (median four), p = 0.001. VRS size did not differ between both groups. VRS count in MS patients was associated with sBVF (rho = −0.40, p = 0.02), but not with lesion count ( p = 0.22). Conclusions: The 7T MRI reveals increased numbers of VRS in MS. The finding that VRS are associated with supratentorial brain atrophy, but not with lesion count, suggests that VRS might rather serve as a neurodegenerative than an inflammatory marker in MS.
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Affiliation(s)
- ID Kilsdonk
- Department of Radiology and Nuclear Medicine, VU University Medical Center, the Netherlands
| | - MD Steenwijk
- Department of Radiology and Nuclear Medicine, VU University Medical Center, the Netherlands
| | - PJW Pouwels
- Department of Physics and Medical Technology, VU University Medical Center, the Netherlands
| | - JJM Zwanenburg
- Department of Radiology, University Medical Center Utrecht, the Netherlands
| | - F Visser
- Department of Radiology, University Medical Center Utrecht, the Netherlands
| | - PR Luijten
- Department of Radiology, University Medical Center Utrecht, the Netherlands
| | - JJG Geurts
- Department of Anatomy and Neurosciences, VU University Medical Center, the Netherlands
| | - F Barkhof
- Department of Radiology and Nuclear Medicine, VU University Medical Center, the Netherlands
| | - MP Wattjes
- Department of Radiology and Nuclear Medicine, VU University Medical Center, the Netherlands
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Groscurth S, Müller B, Visser F, Blob B, Menzel M, Rüping BA, Twyman RM, Prüfer D, Noll GA. Uncertain role of MtSEO-F3 in assembly of Medicago truncatula forisomes. Plant Signal Behav 2014; 9:e29581. [PMID: 25763696 PMCID: PMC4205126 DOI: 10.4161/psb.29581] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 06/13/2014] [Accepted: 06/13/2014] [Indexed: 06/04/2023]
Abstract
Forisomes are specialized multimeric protein complexes found only in the papilionoid legumes. They undergo a reversible conformational change in response to phloem injury to enable the occlusion of sieve tubes, thus preventing the loss of photoassimilates. The individual subunits are designated by the letters SEO-F (sieve element occlusion by forisomes) and are part of the larger SEO protein family, which also includes the typical P-proteins found in most dicots and some monocots. When specific SEO-F subunits from different species are expressed in a heterologous background, they self-assemble into fully-functional artificial forisomes. However, with the exception of basal species such as Dipteryx panamensis, the geometry of these artificial forisomes differs from that of their native counterparts. Studies involving SEO-F proteins from the model legume Medicago truncatula have shown that a combination of 3 of the 4 subunits can fine-tune the geometry of artificial forisomes. However, MtSEO-F3 was excluded from these studies because it was not incorporated into either the native or artificial forisomes in our original experiments. In this addendum, we present further data concerning the interactive properties of the SEO-F proteins and confirm that all 4 MtSEO-F proteins interact in all possible pairwise combinations. These data indicate that the exclusion of MtSEO-F3 from the compact forisome may reflect the steric hindrance of binding sites rather than an inability to interact with other forisome subunits.
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Affiliation(s)
- Sira Groscurth
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME; Münster, Germany
| | - Boje Müller
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME; Münster, Germany
| | - Franziska Visser
- Institute of Plant Biology and Biotechnology; University of Münster; Münster, Germany
| | - Bernhard Blob
- Institute of Plant Biology and Biotechnology; University of Münster; Münster, Germany
| | - Matthias Menzel
- Fraunhofer Institute for Mechanics and Materials IWM; Halle, Germany
| | - Boris A Rüping
- Institute of Plant Biology and Biotechnology; University of Münster; Münster, Germany
| | | | - Dirk Prüfer
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME; Münster, Germany
- Institute of Plant Biology and Biotechnology; University of Münster; Münster, Germany
| | - Gundula A Noll
- Institute of Plant Biology and Biotechnology; University of Münster; Münster, Germany
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Anderwald P, Brandecker A, Coleman M, Collins C, Denniston H, Haberlin MD, O’Donovan M, Pinfield R, Visser F, Walshe L. Displacement responses of a mysticete, an adontocete, and a phacid seal to construction-related vessel traffic. ENDANGER SPECIES RES 2013. [DOI: 10.3354/esr00523] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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van Ooij P, Kleinloog R, Zwanenburg JJ, Visser F, Luijten P, Barker AJ, Markl M, Nederveen A, Majoie CB, Regli L, Rinkel G, Verweij B. Improved depiction of hemodynamics in intracranial aneurysms by 4D flow MRI at 7T compared to 3T. J Cardiovasc Magn Reson 2013. [PMCID: PMC3560014 DOI: 10.1186/1532-429x-15-s1-w12] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Kilsdonk ID, de Graaf WL, Soriano AL, Zwanenburg JJ, Visser F, Kuijer JPA, Geurts JJG, Pouwels PJW, Polman CH, Castelijns JA, Luijten PR, Barkhof F, Wattjes MP. Multicontrast MR imaging at 7T in multiple sclerosis: highest lesion detection in cortical gray matter with 3D-FLAIR. AJNR Am J Neuroradiol 2012; 34:791-6. [PMID: 23042930 DOI: 10.3174/ajnr.a3289] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND AND PURPOSE 7T MR imaging has led to improved detection and classification of cortical MS lesions, mainly based on T2*-weighted gradient-echo sequences. Depiction of cortical GM by using the recommended MS imaging protocol has not yet been investigated at 7T. We aimed to investigate prospectively which recommended sequence for clinical use has the highest value at 7T, in terms of GM and WM lesion detection. MATERIALS AND METHODS Thirty-seven patients with MS (mean age, 43.8 years; 25 women) and 7 healthy controls (mean age, 40.4 years; 5 women) underwent multicontrast 7T MR imaging including the recommended clinical 2D-T2WI, 3D-T1WI, 3D-FLAIR, and GM-specific 3D-DIR. Lesions were scored and categorized anatomically by 3 raters, in consensus. The value of sequences was evaluated lesion-wise and patient-wise (Wilcoxon signed-rank test). RESULTS At 7T, 3D-FLAIR detected the highest number of total cortical GM lesions (217), 89% more than 3D-DIR and 87% and 224% more than 2D-T2WI and 3D-T1WI. Patient-wise analysis showed that this difference between 3D-FLAIR and 3D-DIR was statistically significant (P<.04), and most pronounced for the number of mixed lesions (P<.03). 3D-FLAIR also detected the highest number of total WM lesions (2605), but the difference with 3D-DIR and 3D-T1WI was not significant. CONCLUSIONS When using recommended clinical sequences at 7T, the best way to detect cortical GM lesions is with 3D-FLAIR and not by GM-specific 3D-DIR or by conventional 2D-T2WI and 3D-T1WI sequences.
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Affiliation(s)
- I D Kilsdonk
- Department of Radiology, VU University Medical Center Amsterdam, the Netherlands.
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van Ooij P, Zwanenburg JJM, Visser F, Majoie CB, vanBavel E, Hendrikse J, Nederveen AJ. Quantification and visualization of flow in the Circle of Willis: Time-resolved three-dimensional phase contrast MRI at 7 T compared with 3 T. Magn Reson Med 2012; 69:868-76. [DOI: 10.1002/mrm.24317] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 03/01/2012] [Accepted: 04/09/2012] [Indexed: 11/09/2022]
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de Graaf WL, Visser F, Wattjes MP, Zwanenburg JJ, Pouwels PJW, Geurts JJG, Polman CH, Barkhof F, Luijten PR, Castelijns JA. 7 Tesla 3D-MP-FLAIR and 3D-MP-DIR: Lesion Detection in Multiple Sclerosis. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1268258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Biessels GJ, Zwanenburg JJM, Visser F, Frijns CJM, Luijten PR. Hypertensive cerebral hemorrhage: Imaging the leak with 7-T MRI. Neurology 2010; 75:572-3. [DOI: 10.1212/wnl.0b013e3181ec7f99] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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de Kuijper G, Hoekstra P, Visser F, Scholte FA, Penning C, Evenhuis H. Use of antipsychotic drugs in individuals with intellectual disability (ID) in the Netherlands: prevalence and reasons for prescription. J Intellect Disabil Res 2010; 54:659-67. [PMID: 20426795 DOI: 10.1111/j.1365-2788.2010.01275.x] [Citation(s) in RCA: 51] [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] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
BACKGROUND We investigated antipsychotic drug prescription practice of Dutch ID physicians, studying prevalence of antipsychotic drug use, reasons for prescription and the relationship between these reasons and patient characteristics. METHODS A cross-sectional study of medical and pharmaceutical records in a population living in residential settings of three care providers for persons with IDs in the Netherlands (n = 2373). RESULTS Prevalence of antipsychotic drug use was 32.2% (95% CI 30.1-33.9). Behavioural problems were the reason for prescription of antipsychotic drugs in 58% of cases and psychotic disorder or psychotic symptoms in 22.5%. In 11.7% the diagnosis of psychotic disorder was specified according to DSM-IV criteria. In 18.5% the reason for prescription was not noted in the medical record. Behavioural problems as reason for prescription was associated with profound and severe ID, living in a central location and male sex. Psychotic disorder specified according to DSM-IV as indication for prescription was negatively associated with profound and severe ID and with presence of an additional mental disorder. Absence of a noted reason for prescription was associated with female sex and with the presence of an additional mental disorder. DISCUSSION Current prevalence and reason for prescription of antipsychotic drugs are similar with outcomes of previous studies. Our results show the continuing lack of evidence-based psychopharmacological treatment in mental health care for persons with IDs.
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Affiliation(s)
- Gerda de Kuijper
- Vanboeijen, Centre for the Intellectually Disabled, Assen, The Netherlands.
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Conijn MMA, Luijten PR, Zwanenburg JJM, Visser F, Biessels GJ, Geerlings MI, Hendrikse J. Detection of cerebral microbleeds with dual echo T2*-weighted imaging at 7.0 Tesla MRI. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0029-1246587] [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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Visser F, Zwanenburg JJM, Luijten PR. Magnetization prepared 3D-FLAIR Imaging at 7.0 Tesla. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0029-1246590] [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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Hartman KL, Visser F, Hendriks AJ. Social structure of Risso’s dolphins (Grampus griseus) at the Azores: a stratified community based on highly associated social units. CAN J ZOOL 2008. [DOI: 10.1139/z07-138] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this study, we present for the first time a model for the social structure of Risso’s dolphins ( Grampus griseus Cuvier, 1812). Over the period 2004–2006, 1028 Risso’s dolphins were identified at Pico island, Azores. Individuals sighted on 10 or more occasions were included in the analysis of social structure (n = 183). High resighting rates indicate strong site fidelity for at least part of the population. We found that individuals form stable, long-term bonds organised in pairs or in clusters of 3–12 individuals. Social structure is stratified based on age and sex classes, with strong associations between adult males and between adult females. We suggest that clusters form the basic units of Risso’s dolphin society. Thirteen pods consisting solely of adults, likely males, and 3 pods consisting of mother–calf pairs were identified. Males are organised in stable, long-term associations of varying size that occur throughout the complete range of behavioural states observed. For females, associations can be of similar strength, but the time scale may vary depending on the presence of nursing calves. As subadults, associations also occur (pair formation), but are less stable than those observed for adults. We propose a new model for Risso’s dolphin societies known as a stratified social organisation, which differs from the fission–fusion and matrilineal society models.
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Affiliation(s)
- K. L. Hartman
- Nova Atlantis Foundation, Rua Dr A.F. Pimentel 11, 9930-309 Santa Cruz das Ribeiras, Lajes do Pico, Pico island, Azores, Portugal
- University of Amsterdam, Institute for Biodiversity and Ecosystem Dymanics, Nieuwe Achtergracht 127, 1018 WS Amsterdam, the Netherlands
- Netherlands Organisation for Applied Scientific Research, Oude Waalsdorperweg 63, 2597 AK Den Haag, the Netherlands
| | - F. Visser
- Nova Atlantis Foundation, Rua Dr A.F. Pimentel 11, 9930-309 Santa Cruz das Ribeiras, Lajes do Pico, Pico island, Azores, Portugal
- University of Amsterdam, Institute for Biodiversity and Ecosystem Dymanics, Nieuwe Achtergracht 127, 1018 WS Amsterdam, the Netherlands
- Netherlands Organisation for Applied Scientific Research, Oude Waalsdorperweg 63, 2597 AK Den Haag, the Netherlands
| | - A. J.E. Hendriks
- Nova Atlantis Foundation, Rua Dr A.F. Pimentel 11, 9930-309 Santa Cruz das Ribeiras, Lajes do Pico, Pico island, Azores, Portugal
- University of Amsterdam, Institute for Biodiversity and Ecosystem Dymanics, Nieuwe Achtergracht 127, 1018 WS Amsterdam, the Netherlands
- Netherlands Organisation for Applied Scientific Research, Oude Waalsdorperweg 63, 2597 AK Den Haag, the Netherlands
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Coppus A, Evenhuis H, Verberne GJ, Visser F, van Gool P, Eikelenboom P, van Duijin C. Dementia and mortality in persons with Down's syndrome. J Intellect Disabil Res 2006; 50:768-77. [PMID: 16961706 DOI: 10.1111/j.1365-2788.2006.00842.x] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
BACKGROUND Numerous studies have documented that persons with Down's syndrome (DS) are at an increased risk of Alzheimer's disease (AD). However, at present it is still not clear whether or not all persons with DS will develop dementia as they reach old age. METHODS We studied 506 people with DS, aged 45 years and above. A standardized assessment of cognitive, functional and physical status was repeated annually. If deterioration occurred, the patients were examined and the differential diagnosis of dementia was made according to the revised Dutch consensus protocol and according to the ICD-10 Symptom Checklist for Mental Disorders. We compared our findings with those reported in the literature. RESULTS The overall prevalence of dementia was 16.8%. Up to the age of 60, the prevalence of dementia doubled with each 5-year interval. Up to the age of 49, the prevalence is 8.9%, from 50 to 54, it is 17.7%, and from 55 to 59, it is 32.1%. In the age category of 60 and above, there is a small decrease in prevalence of dementia to 25.6%. The lack of increase after the age of 60 may be explained by the increased mortality among elderly demented DS patients (44.4%) in comparison with non-demented patients (10.7%) who we observed during a 3.3-year follow-up. There was no decrease in incidence of dementia in the age group of 60 and above. Our findings are very similar to those published in the literature. Patients with dementia were more frequently treated with antiepileptic, antipsychotic and antidepressant drugs. The history of depression was strongly associated with dementia. CONCLUSIONS Our study is one of the largest population-based studies to date. We found that despite the exponential increase in prevalence with age, the prevalence of dementia in the oldest persons with DS was not higher than 25.6%.
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Affiliation(s)
- A Coppus
- Department of Epidemiology & Biostatistics, Erasmus MC, Rotterdam, the Netherlands.
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Abstract
OBJECTIVE To explore, over a one-year period, the ideas and attitudes of patients with end-stage cardiac failure concerning dying. DESIGN Prospective longitudinal multiple case study using qualitative interview techniques. PARTICIPANTS Thirty-one patients from two hospitals who fulfilled one or more of the following criteria: NYHA III or IV, ejection fraction < 25%, at least one hospitalization for heart failure. MAIN OUTCOMES Statements of patients with advanced heart failure, expressed in semi-structured interviews, concerning the quality of dying and medical decisions at the end of life. RESULTS Many respondents only thought about death during exacerbations. Mentioned aspects of appropriate dying include: a degree of usefulness, prognostic knowledge, appropriate duration and mental awareness. Few respondents were in favour of euthanasia or suicide, but all wanted life-prolonging treatment to be withheld or withdrawn when appropriate. CONCLUSIONS Our study found some elements of 'appropriate dying' that differ from other studies and that are relatively specific for advanced heart failure. The tendency of patients not to think about death raises ethical concerns.
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Affiliation(s)
- D L Willems
- Department of General Practice, Academic Medical Centre/University of Amsterdam, Amsterdam, The Netherlands.
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Abstract
The advent of high-resolution genetic maps and semiautomated genotyping technology has opened the way for genome screening in genetically complex traits. Many such screens are now under way, or completed, most using multipoint nonparametric linkage analysis of affected sibling pairs. This type of linkage analysis uses all the available genotype information to calculate the maximum lod score (MLS) value at each point in the genome, and thereby generates MLS profiles along each chromosome. Any positive MLS values indicate potential linkage, but the peaks in these profiles, which may be referred to as "hits," identify the most likely locations of disease susceptibility genes. However, such analysis presents serious problems of multiple testing, and the assessment of the statistical significance of hits has become a contentious issue [Lander and Kruglyak (1995) Nat Genet 11:241-247; Curtis (1996) Nat Genet 12:356-357; Witte et al. (1996) Nat Genet 12:355-356]. Having recently completed a genome screen in multiple sclerosis, we decided to investigate the statistical properties of our study by simulation. We report here in detail the results of this simulation study. Our main conclusion is that, for the particular set of families and markers used in our screen, an MLS of 3.2 carries a genome-wide significance of 5% (that is, there is a 5% probability of observing at least one false hit, above this threshold in a complete genome screen). This value is closer to the familiar limit of 3.0, originally suggested by Morton [1955; Am J Hum Genet 7:277-318] than to the more stringent limit of 4.0 recently proposed by Lander and Kruglyak [1995; Nat Genet 11:241-247]. This is somewhat reassuring, in view of the very large sample sizes that would be necessary to achieve adequate power to detect linkage at the more stringent threshold.
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Affiliation(s)
- S Sawcer
- University of Cambridge Neurology Unit, Addenbrooke's Hospital, United Kingdom
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van der Ent M, Jeneson JA, Remme WJ, Berger R, Ciampricotti R, Visser F. A non-invasive selective assessment of type I fibre mitochondrial function using 31P NMR spectroscopy. Evidence for impaired oxidative phosphorylation rate in skeletal muscle in patients with chronic heart failure. Eur Heart J 1998; 19:124-31. [PMID: 9503185 DOI: 10.1053/euhj.1997.0727] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Skeletal muscle abnormalities contribute considerably to the clinical expression of heart failure. Deconditioning, underperfusion and an increased number of type IIb glycolytical fibres lead to early lactate production and muscle fatigue at low exercise levels. Aerobic muscle metabolism may also be impaired, as suggested by biopsy studies. Thus far, no data are available from non-invasive studies to indicate the extent of aerobic muscle dysfunction during low-grade exercise which does not induce acidosis. METHODS AND RESULTS Mitochondrial function of skeletal muscle during fibre type I activation was studied in 22 patients with chronic heart failure [NYHA class III, left ventricular ejection fraction 28 +/- 2%, (patients)] on ACE inhibitors, diuretics and digoxin, and in 20 normal subjects, using 31P NMR spectroscopy of a single right forearm flexor muscle during three mild intermittent exercise levels (0-40% of maximum voluntary contraction) and recovery time. At rest, the inorganic phosphate/phosphocreatine ratio was different [0.13 +/- 0.005 (patients) vs 0.09 +/- 0.002 (normal subjects), P = 0.0001]. However, intracellular pH was comparable. Local acidosis (tissue pH < 6.9) was avoided to prevent fibre type IIb activation. Calculated resting phosphate potential levels were comparable, but the slope and intercept of the linear relationship of phosphate potential and workload were significantly lower in patients than in normal subjects (11.7 +/- 0.7 vs 15.8 +/- 0.6 and 139 +/- 7 vs 196 +/- 7, patients vs normal subjects, indicating early exhaustion of intracellular energy at lower exercise levels. Also, maximum calculated workload at which tissue ADP stabilized was lower in patients than in normal subjects (88 +/- 7% vs 120 +/- 4% of maximum voluntary workload, patients vs normal subjects, P < 0.05). Time to recovery to pre-test phosphocreatine levels was prolonged by 46% in patients compared to normal subjects (P < 0.05). CONCLUSIONS In heart failure, oxidative fibre mitochondrial function in skeletal muscle is impaired, as reflected by the reduced phosphate potential and oxidative phosphorylation rate, early exhaustion and slowed recovery of intracellular energy reserve at workloads, which do not affect intracellular pH.
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den Ouden C, Datema K, Visser F, Mackay M, Post M. On the dynamics of organic-zeolite interactions: Tetramethylammonium in sodalite. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/s0144-2449(05)80108-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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den Ouden C, Datema K, Visser F, Mackay M, Post M. On the dynamics of organic-zeolite interactions: Tetramethylammonium in sodalite. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/s0144-2449(05)80109-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Visser F, Wormer PES, Stam P. Erratum: Time‐dependent coupled Hartree–Fock calculations of multipole polarizabilities and dispersion interactions in van der Waals dimers consisting of He, H2, Ne, and N2 [J. Chem. Phys. 79, 4973 (1983)]. J Chem Phys 1984. [DOI: 10.1063/1.448203] [Citation(s) in RCA: 5] [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: 11/15/2022] Open
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Van Der Knaap T, Klebach T, Visser F, Bickelhaupt F, Ros P, Baerends E, Stam C, Konijn M. Synthesis and structure of aryl-substituted phospha-alkenes. Tetrahedron 1984. [DOI: 10.1016/s0040-4020(01)91106-8] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Visser F, Wormer PES, Stam P. Time‐dependent coupled Hartree–Fock calculations of multipole polarizabilities and dispersion interactions in van der Waals dimers consisting of He, H2, Ne, and N2. J Chem Phys 1983. [DOI: 10.1063/1.445591] [Citation(s) in RCA: 129] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Diamond TH, Smith R, Goldman AP, Myburgh DP, Bloch JM, Visser F. The dilemma of the creatine kinase cardiospecific iso-enzyme (CK-MB) in marathon runners. S Afr Med J 1983; 63:37-41. [PMID: 6849159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Serum creatine kinase iso-enzyme (CK-MB) levels were measured in 51 marathon runners before and after a 50 km marathon event. Ninety-five per cent of the runners were found to have pathologically elevated values, i.e. CK-MB concentrations were elevated to the range normally considered indicative of myocardial necrosis. Results indicate that a rise in the CK-MB level is common after marathon running. We therefore believe that cardiac enzymes are an unreliable indicator of myocardial infarction in patients who experience chest pain following strenuous muscular exercise.
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Paldus J, Wormer PES, Visser F, van der Avoird A. Relationship between configuration interaction and coupled cluster approaches. J Chem Phys 1982. [DOI: 10.1063/1.443275] [Citation(s) in RCA: 74] [Impact Index Per Article: 1.8] [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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Jansen BC, Knoetze PC, Visser F. The antibody response of cattle to Clostridium botulinum types C and D toxoids. Onderstepoort J Vet Res 1976; 43:165-73. [PMID: 799279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The resistance of cattle with varying serum-antitoxin titres was determined by per os challenge. The results proved that a solid immunity can be produced against C. botulinum toxins C1 and D. The immune response of cattle to various quantities of C. botulinum C1 and D toxoids, aluminium-phosphate-adsorbed and in water-in-oil emulsion was investigated. The response to antigen in water-in-oil emulsion was far superior to the other when they were used for primary and secondary stimuli. When cattle had been given a solid basic immunity with 2 injections of antigen in water-in-oil emulsion, essentially the same booster effect was obtained with antigen in water-in-oil emulsion and in aqueous solution. Only some of the animals injected intramuscularly with antigens in water-in-oil emulsion developed local lesions. These lesions were not large and their histological picture indicated a noticeable decline in severity within 20 weeks. A case is thus made out for the use of C. botulinum C1 and D toxoids in water-in-oil emulsion for the primary and secondary stimuli and an aqueous solution of these antigens for any booster stimulus as an improved method of protecting cattle against botulism.
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Jansen BC, Knoetze PC, Visser F. The antigenicity of Clostridium botulinum type C toxin administered per os. Onderstepoort J Vet Res 1970; 37:169-71. [PMID: 4949136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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