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Werensteijn-Honingh A, Wevers A, Peters M, Kroon P, Intven M, Eppinga W, Jürgenliemk-Schulz I. PD-0745 Outcomes & predictors of progression: SBRT for lymph node oligorecurrent prostate cancer on PSMA-PET. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07024-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Huijskens S, Kroon P, Demiroz Abakay C, Timmermann B, Giralt J, Gaze M, Harrabi S, Scarzello G, Alexopoulou A, Padovani L, Escande A, Gandola L, Supiot S, Chojnacka M, Bokun J, Napieralska A, Rombi B, Maduro J, Bolle S, Mussano A, Mandeville H, Claude L, Seravalli E, Janssens G. OC-0454: Current radiotherapy practice for children with metastases from solid tumors: SIOPE survey analysis. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00476-x] [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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Hes J, Van Lier A, De Leeuw A, Den Hartogh M, Kroon P, De Groot-van Breugel E, Jürgenliemk-Schulz I. OC-0713: MR-linac boosts for patients with cervix cancer ineligible for brachytherapy; preliminary experience. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00735-0] [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: 10/22/2022]
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Maity S, Ottelé J, Santiago GM, Frederix PWJM, Kroon P, Markovitch O, Stuart MCA, Marrink SJ, Otto S, Roos WH. Caught in the Act: Mechanistic Insight into Supramolecular Polymerization-Driven Self-Replication from Real-Time Visualization. J Am Chem Soc 2020; 142:13709-13717. [PMID: 32786814 PMCID: PMC7426903 DOI: 10.1021/jacs.0c02635] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [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] [Indexed: 12/13/2022]
Abstract
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Self-assembly features
prominently in fields ranging from materials
science to biophysical chemistry. Assembly pathways, often passing
through transient intermediates, can control the outcome of assembly
processes. Yet, the mechanisms of self-assembly remain largely obscure
due to a lack of experimental tools for probing these pathways at
the molecular level. Here, the self-assembly of self-replicators into
fibers is visualized in real-time by high-speed atomic force microscopy
(HS-AFM). Fiber growth requires the conversion of precursor molecules
into six-membered macrocycles, which constitute the fibers. HS-AFM
experiments, supported by molecular dynamics simulations, revealed
that aggregates of precursor molecules accumulate at the sides of
the fibers, which then diffuse to the fiber ends where growth takes
place. This mechanism of precursor reservoir formation, followed by
one-dimensional diffusion, which guides the precursor molecules to
the sites of growth, reduces the entropic penalty associated with
colocalizing precursors and growth sites and constitutes a new mechanism
for supramolecular polymerization.
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Affiliation(s)
- Sourav Maity
- Molecular Biophysics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Jim Ottelé
- Centre for Systems Chemistry, Stratingh Institute, University of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Guillermo Monreal Santiago
- Centre for Systems Chemistry, Stratingh Institute, University of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Pim W J M Frederix
- Groningen Biomolecular Sciences and Biotechnology Institute & Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, Groningen 9747 AG, The Netherlands
| | - Peter Kroon
- Groningen Biomolecular Sciences and Biotechnology Institute & Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, Groningen 9747 AG, The Netherlands
| | - Omer Markovitch
- Centre for Systems Chemistry, Stratingh Institute, University of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands.,Origins Center, Nijenborgh 7, Groningen 9747 AG, The Netherlands
| | - Marc C A Stuart
- Centre for Systems Chemistry, Stratingh Institute, University of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Siewert J Marrink
- Groningen Biomolecular Sciences and Biotechnology Institute & Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, Groningen 9747 AG, The Netherlands
| | - Sijbren Otto
- Centre for Systems Chemistry, Stratingh Institute, University of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Wouter H Roos
- Molecular Biophysics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
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Bazen W, Kroon P, Moerland R, Van de Vegt S, Mulder P, Schokker R, Van Vliet-van den Ende K, Kloosterman S, Dehnad H. OC-0398 Clinical introduction of 3D printed applicators for endocavitary and interstitial brachytherapy. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30818-7] [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: 10/26/2022]
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Kroon P. SP-0373: Planning and delivery strategies for oligometastatic disease. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)30683-2] [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: 10/14/2022]
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Kroon P, Berry P, Bhasin D, Li C, Li P, Stower M, Mann V, Simms M, Maitland N, Collins A. 301 Interleukin-6 Expression and JAK-STat Signalling in Prostate Cancer Stem Cells. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)70995-4] [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: 10/28/2022]
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Essers M, Kroon P, Hol S, D'Olieslager G. OC-0560 THE ACCURACY AND CLINICAL QUALITY OF STEREOTACTIC LUNG RAPIDARC PLANNING IN ECLIPSE USING ACUROS AND AAA. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70899-x] [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: 10/28/2022]
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Lodi F, Tribolo S, Needs P, Kroon P, Hughes D. EFFECT OF FLAVONOIDS IN PREVENTING INFLAMMATION-INDUCED IMPAIRMENT OF HUMAN VASCULAR CELL FUNCTION. ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70179-x] [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: 11/30/2022]
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Black L, Kiely M, Kroon P, Plumb J, Gry J. Development of EuroFIR-BASIS – a composition and biological effects database for plant-based bioactive compounds. NUTR BULL 2008. [DOI: 10.1111/j.1467-3010.2007.00649.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ranka S, Gee JM, Biro L, Brett G, Saha S, Kroon P, Skinner J, Hart AR, Cassidy A, Rhodes M, Johnson IT. Development of a food frequency questionnaire for the assessment of quercetin and naringenin intake. Eur J Clin Nutr 2007; 62:1131-8. [PMID: 17538531 DOI: 10.1038/sj.ejcn.1602827] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [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] [Indexed: 11/09/2022]
Abstract
OBJECTIVES To measure the relationship between quercetin and naringenin intakes as estimated by food frequency questionnaire (FFQ), and the urinary excretion of quercetin and naringenin aglycones after their enzymatic hydrolysis in human volunteers. SUBJECTS AND METHODS Volunteers were recruited via the Human Nutrition Unit volunteer databank at the Institute of Food Research, Norwich. Sixty-three volunteers were recruited into the study, of which 14 were excluded and 49 completed the study. A modified FFQ was developed and used to estimate daily intake of quercetin and naringenin in 49 healthy volunteers who also provided five 24-h urine samples over a 2-week period. Urinary excretion of quercetin and naringenin metabolites was determined by solid-phase extraction and high-pressure liquid chromatography. RESULTS The estimated mean intakes of quercetin and naringenin were 29.4 mg (s.d. 15.0) and 58.1 mg (s.d. 62.7) per day, respectively. Mean urinary excretion of quercetin was 60.1 microg (s.d. 33.1) and that of naringenin was 0.56 mg (s.d. 0.4). The correlation between FFQ estimated intake of quercetin and naringenin and levels excreted in the urine were r=0.82 (P<0.0001) and r=0.25 (P=0.05), respectively. CONCLUSIONS We observed a statistically significant correlation between the urinary excretion of quercetin and naringenin metabolites and their dietary intake as estimated by FFQ. Use of FFQs in epidemiological studies requiring an estimate of flavonoid intake seems justified.
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Affiliation(s)
- S Ranka
- Department of Surgery, Norfolk and Norwich University Hospital, Norwich, UK
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Gunning AP, Kirby AR, Mackie AR, Kroon P, Williamson G, Morris VJ. Watching molecular processes with the atomic force microscope: dynamics of polymer adsorption and desorption at the single molecule level. J Microsc 2004; 216:52-6. [PMID: 15369483 DOI: 10.1111/j.0022-2720.2004.01391.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The formation of networks is an important step in the synthesis of many biological assemblies. For example, during the synthesis of plant cell walls the factors which dictate the arrangement of the polymeric constituents that make up the cell wall are not yet understood. Factors such as site-directed binding provide a possible theoretical background for beginning to understand the assembly of complex biological structures, but modelling of this process is difficult, time consuming and lacks experimental methods for verification. Through the use of atomic force microscopy (AFM) it has been demonstrated that changes in the binding of a single heterogeneous cell wall polysaccharide to a charged substrate can be followed in real time. Furthermore, subsequent image analysis allows the probability of binding of the molecule to be mapped to produce a real data set which is comparable with those obtained in simulation studies. In addition, these AFM studies have provided new mechanistic clues to the adsorption/desorption process of this polysaccharide.
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Affiliation(s)
- A P Gunning
- Institute of Food Research, Norwich Research Park, Colney, Norwich, UK.
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