1
|
Beduleva L, Sidorov A, Fomina K, Terentiev A, Menshikov I, Shklyaeva N, Ivanov P, Varaksin V. Experimental rat models for Hashimoto's thyroiditis. J Endocrinol Invest 2024; 47:1205-1214. [PMID: 38010598 DOI: 10.1007/s40618-023-02240-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Accepted: 11/04/2023] [Indexed: 11/29/2023]
Abstract
PURPOSE Hashimoto's thyroiditis (HT) is an autoimmune thyroid disease characterized by T lymphocyte-mediated destruction of thyroid follicles. To study the pathogenesis of HT and the efficacy of new substances for its treatment, an easily obtained and adequate to the human disease experimental model is needed. The aim of our study was to find out whether it is possible to induce experimental autoimmune thyroiditis (EAT) similar to Hashimoto's thyroiditis by injecting with thyroglobulin (Tg) without using agents that enhance its thyroiditogenicity and without taking into account the genetic sensitivity of animals. METHODS Wistar rats were immunized with freshly isolated rat Tg or porcine Tg. In 8 weeks, histological studies of the thyroid and parathyroid glands were performed. Thyroid function and total serum calcium level were also evaluated. RESULTS Immunization with both rat and porcine freshly isolated Tg caused T lymphocytic infiltration of the thyroid gland, thyroid follicle atrophy and degradation in Wistar rats. EAT caused by porcine Tg was characterized by greater severity than EAT induced with rat Tg. In 55% of rats with porcine Tg-induced EAT, oxyphilic metaplasia was detected in the parathyroid glands. In addition, low total serum calcium was observed in these rats. CONCLUSION Two rat models of autoimmune thyroiditis were obtained. EAT caused in Wistar rats by immunization with rat Tg is similar to Hashimoto's thyroiditis. EAT induced with porcine Tg was accompanied by oxyphil cell metaplasia in the parathyroids and hypocalcemia.
Collapse
Affiliation(s)
- L Beduleva
- Laboratory of Molecular and Cell Immunology, Department of Immunology and Cell Biology, Udmurt State University, 1 Universitetskaya St., Izhevsk, Russian Federation, 426034.
- Laboratory of Biocompatible Materials, Udmurt Federal Research Center UB RAS, 34 T. Baramzinoy St., Izhevsk, Russian Federation, 426067.
| | - A Sidorov
- Laboratory of Molecular and Cell Immunology, Department of Immunology and Cell Biology, Udmurt State University, 1 Universitetskaya St., Izhevsk, Russian Federation, 426034
- Laboratory of Biocompatible Materials, Udmurt Federal Research Center UB RAS, 34 T. Baramzinoy St., Izhevsk, Russian Federation, 426067
| | - K Fomina
- Laboratory of Molecular and Cell Immunology, Department of Immunology and Cell Biology, Udmurt State University, 1 Universitetskaya St., Izhevsk, Russian Federation, 426034
- Laboratory of Biocompatible Materials, Udmurt Federal Research Center UB RAS, 34 T. Baramzinoy St., Izhevsk, Russian Federation, 426067
| | - A Terentiev
- Laboratory of Molecular and Cell Immunology, Department of Immunology and Cell Biology, Udmurt State University, 1 Universitetskaya St., Izhevsk, Russian Federation, 426034
- Laboratory of Biocompatible Materials, Udmurt Federal Research Center UB RAS, 34 T. Baramzinoy St., Izhevsk, Russian Federation, 426067
| | - I Menshikov
- Laboratory of Molecular and Cell Immunology, Department of Immunology and Cell Biology, Udmurt State University, 1 Universitetskaya St., Izhevsk, Russian Federation, 426034
- Laboratory of Biocompatible Materials, Udmurt Federal Research Center UB RAS, 34 T. Baramzinoy St., Izhevsk, Russian Federation, 426067
| | - N Shklyaeva
- Laboratory of Molecular and Cell Immunology, Department of Immunology and Cell Biology, Udmurt State University, 1 Universitetskaya St., Izhevsk, Russian Federation, 426034
| | - P Ivanov
- Laboratory of Molecular and Cell Immunology, Department of Immunology and Cell Biology, Udmurt State University, 1 Universitetskaya St., Izhevsk, Russian Federation, 426034
| | - V Varaksin
- Laboratory of Biocompatible Materials, Udmurt Federal Research Center UB RAS, 34 T. Baramzinoy St., Izhevsk, Russian Federation, 426067
| |
Collapse
|
2
|
Pibida L, Bergeron DE, Collins SM, Ivanov P, Cessna JT, Fitzgerald RP, Mewburn-Crook J, Zimmerman BE, King L. Absolute emission intensities of the gamma rays from the decay of 224Ra and 212Pb progenies and the half-life of the 212 Pb decay. Appl Radiat Isot 2024; 205:111171. [PMID: 38181577 DOI: 10.1016/j.apradiso.2023.111171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 12/28/2023] [Accepted: 12/29/2023] [Indexed: 01/07/2024]
Abstract
Absolute gamma-ray emission intensities for 36 characteristic gamma rays from the decay of 224Ra, 212Pb, and their progeny were determined by measuring sources calibrated for activity by means of primary methods based on well-defined high-purity germanium (HPGe) detectors at both NIST and NPL. Results from the two laboratories agree with recent data evaluations, except for gamma rays with low emission intensities. The decay schemes have been re-balanced based on the new results. In addition, the half-life for 212Pb was measured using several HPGe detectors, ionization chambers, and a well-type NaI(Tl) detector.
Collapse
Affiliation(s)
- L Pibida
- National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
| | - D E Bergeron
- National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
| | - S M Collins
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK; School of Mathematics and Physics, University of Surrey, Guildford, GU2 7XH, UK.
| | - P Ivanov
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK.
| | - J T Cessna
- National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
| | - R P Fitzgerald
- National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
| | - J Mewburn-Crook
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK.
| | - B E Zimmerman
- National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
| | - L King
- National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
| |
Collapse
|
3
|
Collins SM, Köster U, Robinson AP, Ivanov P, Cocolios TE, Russell B, Fenwick AJ, Bernerd C, Stegemann S, Johnston K, Gerami AM, Chrysalidis K, Mohamud H, Ramirez N, Bhaisare A, Mewburn-Crook J, Cullen DM, Pietras B, Pells S, Dockx K, Stucki N, Regan PH. Determination of the Terbium-152 half-life from mass-separated samples from CERN-ISOLDE and assessment of the radionuclide purity. Appl Radiat Isot 2023; 202:111044. [PMID: 37797447 DOI: 10.1016/j.apradiso.2023.111044] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/15/2023] [Accepted: 09/22/2023] [Indexed: 10/07/2023]
Abstract
Terbium-152 is one of four terbium radioisotopes that together form a potential theranostic toolbox for the personalised treatment of tumours. As 152 Tb decay by positron emission it can be utilised for diagnostics by positron emission tomography. For use in radiopharmaceuticals and for activity measurements by an activity calibrator a high radionuclide purity of the material and an accurate and precise knowledge of the half-life is required. Mass-separation and radiochemical purification provide a production route of high purity 152Tb. In the current work, two mass-separated samples from the CERN-ISOLDE facility have been assayed at the National Physical Laboratory to investigate the radionuclide purity. These samples have been used to perform four measurements of the half-life by three independent techniques: high-purity germanium gamma-ray spectrometry, ionisation chamber measurements and liquid scintillation counting. From the four measurement campaigns a half-life of 17.8784(95) h has been determined. The reported half-life shows a significant difference to the currently evaluated half-life (ζ-score = 3.77), with a relative difference of 2.2 % and an order of magnitude improvement in the precision. This work also shows that under controlled conditions the combination of mass-separation and radiochemical separation can provide high-purity 152Tb.
Collapse
Affiliation(s)
- S M Collins
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK; School of Mathematics and Physics, University of Surrey, Guildford, GU2 7XH, UK.
| | - U Köster
- Institut Laue-Langevin, 38042, Grenoble, France
| | - A P Robinson
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK; Christie Medical Physics and Engineering (CMPE), The Christie NHS Foundation Trust, Manchester, M20 4BX, UK; The University of Manchester, Manchester, M13 9PL, UK
| | - P Ivanov
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| | - T E Cocolios
- KU Leuven, Institute for Nuclear and Radiation Physics, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - B Russell
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| | - A J Fenwick
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| | - C Bernerd
- KU Leuven, Institute for Nuclear and Radiation Physics, Celestijnenlaan 200D, 3001, Leuven, Belgium; CERN - European Organization for Nuclear Research, Esplanade des Particules 1, 1217, Meyrin, Switzerland
| | - S Stegemann
- KU Leuven, Institute for Nuclear and Radiation Physics, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - K Johnston
- CERN - European Organization for Nuclear Research, Esplanade des Particules 1, 1217, Meyrin, Switzerland
| | - A M Gerami
- CERN - European Organization for Nuclear Research, Esplanade des Particules 1, 1217, Meyrin, Switzerland
| | - K Chrysalidis
- CERN - European Organization for Nuclear Research, Esplanade des Particules 1, 1217, Meyrin, Switzerland
| | - H Mohamud
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| | - N Ramirez
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| | - A Bhaisare
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| | - J Mewburn-Crook
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| | - D M Cullen
- The University of Manchester, Manchester, M13 9PL, UK
| | - B Pietras
- The University of Manchester, Manchester, M13 9PL, UK
| | - S Pells
- The University of Manchester, Manchester, M13 9PL, UK
| | - K Dockx
- KU Leuven, Institute for Nuclear and Radiation Physics, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - N Stucki
- HEPIA, HES-SO, University of Applied Sciences and Arts Western Switzerland, Rue de la Prairie 4, 1202, Geneva, Switzerland
| | - P H Regan
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK; School of Mathematics and Physics, University of Surrey, Guildford, GU2 7XH, UK
| |
Collapse
|
4
|
Collins S, Robinson A, Ivanov P, Köster U, Cocolios T, Russell B, Webster B, Fenwick A, Duchemin C, Ramos J, Chevallay E, Jakobsson U, Stegemann S, Regan P, Stora T. Half-life determination of 155Tb from mass-separated samples produced at CERN-MEDICIS. Appl Radiat Isot 2022; 190:110480. [DOI: 10.1016/j.apradiso.2022.110480] [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] [Received: 08/04/2022] [Revised: 09/20/2022] [Accepted: 09/20/2022] [Indexed: 11/02/2022]
|
5
|
Koseva I, Nikolov V, Nikolova R, Tzvetkov P, Ivanov P, Petrova P, Tomova R, Kuvandjiev N, Tarassov M. On the structures and luminescent properties of Eu 3+ doped Li 2 CaGeO 4 , Ca 2 GeO 4 and Ca 5 Ge 3 O 11 compounds. LUMINESCENCE 2022; 37:1492-1503. [PMID: 35817756 DOI: 10.1002/bio.4322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 05/15/2022] [Accepted: 06/21/2022] [Indexed: 11/05/2022]
Abstract
Powder samples of Li2 CaGeO4 , Ca2 GeO4 and Ca5 Ge3 O11 doped by 0.5, 1, 2, 3, 4 and 5 at% Eu3+ relative to the Ca2+ , were prepared by conventional solid state synthesis technique. XRD analyses confirm obtaining of the pure phases at all dopant concentrations. In parallel, single crystals of the three compounds with the experimentally found optimal Eu3+ concentration were grown using the flux method. Structural investigation on the single crystals are done with a special attention on the form of Ca-O polyhedron, the mean Ca-O distance, the Ca-Ca distance in the structure, the distortion degree of the polyhedron as well as the of Eu-Ca substitution site. The main spectral characteristics are analyzed and several relations between the structural and spectra features were found. The optimal dopant concentration is 3 at% for Ca2 GeO4 and 4at% for Ca5 Ge3 O11 and Li2 CaGeO4 . CIE coordinates of the samples show emission colors in the red region close to the standard red coordinates and slightly influenced by the active ion concentration. The obtained results show that europium doped Li2 CaGeO4 , Ca2 GeO4 and Ca5 Ge3 O11 could be used as red phosphors.
Collapse
Affiliation(s)
- I Koseva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - V Nikolov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria.,Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - R Nikolova
- Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - P Tzvetkov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - P Ivanov
- Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - P Petrova
- Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - R Tomova
- Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - N Kuvandjiev
- Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - M Tarassov
- Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Sofia, Bulgaria
| |
Collapse
|
6
|
Martínez Muelas A, Paiva Pajares D, López Isern M, Ivanov P, Sánchez Pérez M. Acute Ekbom’s syndrome in a patient with acute urethritis. Eur Psychiatry 2022. [PMCID: PMC9567529 DOI: 10.1192/j.eurpsy.2022.1223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Introduction Delirium of parasitosis was first described by Karl Ekbom in Sweden in 1938. It is a hallucinatory monothematic delirium characterized by the unwavering conviction of having the skin infested with insects or parasites. Multiple etiologist has been described such as psychiatric and neurological disorders, substance intoxication or other medical conditions. We present a case of debut of Ekbom’s syndrome in an individual recently diagnosed with acute urethritis on antibiotic treatment. Objectives To report a case of a patient with a debut of Ekbom’s syndrome and acute urethritis. Methods A 40-year-old man with no previous psychiatric history is admitted psychiatric emergency room accompanied by his wife for intense anxiety and isolation at home. During the examination, the patient explains a lot of fear of a series of bugs such as bees and small parasites that invade him. The onset of symptomatology coincides with a diagnosis of chlamydia urethritis and the initiation of treatment with ceftriaxone 500mg IM + Azithromycin 1g VO. Complete physical examination is performed without alterations. Toxicological, biochemistry, hormonal and vitamin study did not show any alterations. Results Antipsychotic treatment was started with Olanzapine up to 10mg/day and supportive treatment with benzodiazepines. The patient showed rapid improvement. At discharge, he is asymptomatic from the urological and psychopathological point of view. Conclusions Ekbom’s syndrome is a multifactorial disorder. The patient was diagnosed of an acute psychotic disorder due to another medical condition and/or treatment with antibiotics. Disclosure No significant relationships.
Collapse
|
7
|
Cassells I, Van de Voorde M, Webster B, Ivanov P, Burgoyne A, Cawthorne C, Deroose C, Cardinaels T, Bormans G, Cleeren F, Ooms M. Mild condition radiolabelling and in vivo stability of nanobody constructs with terbium-161 and terbium-155. Nucl Med Biol 2022. [DOI: 10.1016/s0969-8051(22)00141-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: 10/18/2022]
|
8
|
Duchemin C, Ramos JP, Stora T, Ahmed E, Aubert E, Audouin N, Barbero E, Barozier V, Bernardes AP, Bertreix P, Boscher A, Bruchertseifer F, Catherall R, Chevallay E, Christodoulou P, Chrysalidis K, Cocolios TE, Comte J, Crepieux B, Deschamps M, Dockx K, Dorsival A, Fedosseev VN, Fernier P, Formento-Cavaier R, El Idrissi S, Ivanov P, Gadelshin VM, Gilardoni S, Grenard JL, Haddad F, Heinke R, Juif B, Khalid U, Khan M, Köster U, Lambert L, Lilli G, Lunghi G, Marsh BA, Palenzuela YM, Martins R, Marzari S, Menaa N, Michel N, Munos M, Pozzi F, Riccardi F, Riegert J, Riggaz N, Rinchet JY, Rothe S, Russell B, Saury C, Schneider T, Stegemann S, Talip Z, Theis C, Thiboud J, van der Meulen NP, van Stenis M, Vincke H, Vollaire J, Vuong NT, Webster B, Wendt K, Wilkins SG. CERN-MEDICIS: A Review Since Commissioning in 2017. Front Med (Lausanne) 2021; 8:693682. [PMID: 34336898 PMCID: PMC8319400 DOI: 10.3389/fmed.2021.693682] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Accepted: 06/15/2021] [Indexed: 11/29/2022] Open
Abstract
The CERN-MEDICIS (MEDical Isotopes Collected from ISolde) facility has delivered its first radioactive ion beam at CERN (Switzerland) in December 2017 to support the research and development in nuclear medicine using non-conventional radionuclides. Since then, fourteen institutes, including CERN, have joined the collaboration to drive the scientific program of this unique installation and evaluate the needs of the community to improve the research in imaging, diagnostics, radiation therapy and personalized medicine. The facility has been built as an extension of the ISOLDE (Isotope Separator On Line DEvice) facility at CERN. Handling of open radioisotope sources is made possible thanks to its Radiological Controlled Area and laboratory. Targets are being irradiated by the 1.4 GeV proton beam delivered by the CERN Proton Synchrotron Booster (PSB) on a station placed between the High Resolution Separator (HRS) ISOLDE target station and its beam dump. Irradiated target materials are also received from external institutes to undergo mass separation at CERN-MEDICIS. All targets are handled via a remote handling system and exploited on a dedicated isotope separator beamline. To allow for the release and collection of a specific radionuclide of medical interest, each target is heated to temperatures of up to 2,300°C. The created ions are extracted and accelerated to an energy up to 60 kV, and the beam steered through an off-line sector field magnet mass separator. This is followed by the extraction of the radionuclide of interest through mass separation and its subsequent implantation into a collection foil. In addition, the MELISSA (MEDICIS Laser Ion Source Setup At CERN) laser laboratory, in service since April 2019, helps to increase the separation efficiency and the selectivity. After collection, the implanted radionuclides are dispatched to the biomedical research centers, participating in the CERN-MEDICIS collaboration, for Research & Development in imaging or treatment. Since its commissioning, the CERN-MEDICIS facility has provided its partner institutes with non-conventional medical radionuclides such as Tb-149, Tb-152, Tb-155, Sm-153, Tm-165, Tm-167, Er-169, Yb-175, and Ac-225 with a high specific activity. This article provides a review of the achievements and milestones of CERN-MEDICIS since it has produced its first radioactive isotope in December 2017, with a special focus on its most recent operation in 2020.
Collapse
Affiliation(s)
- Charlotte Duchemin
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
- Katholieke Universiteit (KU) Leuven, Institute for Nuclear and Radiation Physics, Leuven, Belgium
| | - Joao P. Ramos
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
- Katholieke Universiteit (KU) Leuven, Institute for Nuclear and Radiation Physics, Leuven, Belgium
| | - Thierry Stora
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Essraa Ahmed
- Katholieke Universiteit (KU) Leuven, Institute for Nuclear and Radiation Physics, Leuven, Belgium
| | - Elodie Aubert
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | | | - Ermanno Barbero
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Vincent Barozier
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Ana-Paula Bernardes
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Philippe Bertreix
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Aurore Boscher
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Frank Bruchertseifer
- European Commission, Joint Research Centre, Nuclear Safety and Security, Karlsruhe, Germany
| | - Richard Catherall
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Eric Chevallay
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | | | | | - Thomas E. Cocolios
- Katholieke Universiteit (KU) Leuven, Institute for Nuclear and Radiation Physics, Leuven, Belgium
| | - Jeremie Comte
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Bernard Crepieux
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Matthieu Deschamps
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Kristof Dockx
- Katholieke Universiteit (KU) Leuven, Institute for Nuclear and Radiation Physics, Leuven, Belgium
| | - Alexandre Dorsival
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | | | - Pascal Fernier
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Robert Formento-Cavaier
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
- Groupement d'Intérêt Public ARRONAX, Nantes, France
| | - Safouane El Idrissi
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Peter Ivanov
- National Physical Laboratory, Teddington, United Kingdom
| | - Vadim M. Gadelshin
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
- Johannes Gutenberg University, Mainz, Germany
| | - Simone Gilardoni
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Jean-Louis Grenard
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Ferid Haddad
- Groupement d'Intérêt Public ARRONAX, Nantes, France
| | - Reinhard Heinke
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
- Katholieke Universiteit (KU) Leuven, Institute for Nuclear and Radiation Physics, Leuven, Belgium
| | - Benjamin Juif
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Umair Khalid
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
- Pakistan Institute of Nuclear Science and Technology, Islamabad, Pakistan
| | - Moazam Khan
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
- Pakistan Institute of Nuclear Science and Technology, Islamabad, Pakistan
| | | | - Laura Lambert
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - G. Lilli
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Giacomo Lunghi
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Bruce A. Marsh
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | | | - Renata Martins
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Stefano Marzari
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Nabil Menaa
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | | | - Maxime Munos
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Fabio Pozzi
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Francesco Riccardi
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Julien Riegert
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Nicolas Riggaz
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Jean-Yves Rinchet
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Sebastian Rothe
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Ben Russell
- National Physical Laboratory, Teddington, United Kingdom
| | - Christelle Saury
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Thomas Schneider
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Simon Stegemann
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
- Katholieke Universiteit (KU) Leuven, Institute for Nuclear and Radiation Physics, Leuven, Belgium
| | | | - Christian Theis
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Julien Thiboud
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | | | - Miranda van Stenis
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Heinz Vincke
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Joachim Vollaire
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | - Nhat-Tan Vuong
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | | | - Klaus Wendt
- Johannes Gutenberg University, Mainz, Germany
| | - Shane G. Wilkins
- Organisation Européenne pour la Recherche Nucléaire (CERN), Geneva, Switzerland
| | | |
Collapse
|
9
|
Bergeron DE, Collins SM, Pibida L, Cessna JT, Fitzgerald R, Zimmerman BE, Ivanov P, Keightley JD, Napoli E. Ra-224 activity, half-life, and 241 keV gamma ray absolute emission intensity: A NIST-NPL bilateral comparison. Appl Radiat Isot 2021; 170:109572. [PMID: 33461017 PMCID: PMC8406413 DOI: 10.1016/j.apradiso.2020.109572] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 12/11/2020] [Accepted: 12/21/2020] [Indexed: 11/23/2022]
Abstract
The national metrology institutes for the United Kingdom (UK) and the United States of America (USA) have compared activity standards for 224Ra, an α-particle emitter of interest as the basis for therapeutic radiopharmaceuticals. Solutions of 224RaCl2 were assayed by absolute methods, including digital coincidence counting and triple-to-double coincidence ratio liquid scintillation counting. Ionization chamber and high-purity germanium (HPGe) γ-ray spectrometry calibrations were compared; further, a solution was shipped between laboratories for a direct comparison by HPGe spectrometry. New determinations of the absolute emission intensity for the 241 keV γ ray (Iγ = 4.011(16) per 100 disintegrations of 224Ra) and of the 224Ra half-life (T1/2 = 3.6313(14) d) are presented and discussed in the context of previous measurements and evaluations.
Collapse
Affiliation(s)
- Denis E Bergeron
- Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
| | - Sean M Collins
- National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK; Department of Physics, University of Surrey, Stag Hill, Guildford, GU2 7XH, UK
| | - Leticia Pibida
- Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Jeffrey T Cessna
- Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Ryan Fitzgerald
- Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Brian E Zimmerman
- Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Peter Ivanov
- National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK
| | - John D Keightley
- National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK
| | - Elisa Napoli
- Oncoinvent AS, Oslo, Norway; Department of Radiation Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| |
Collapse
|
10
|
Wilson JN, Thisse D, Lebois M, Jovančević N, Gjestvang D, Canavan R, Rudigier M, Étasse D, Gerst RB, Gaudefroy L, Adamska E, Adsley P, Algora A, Babo M, Belvedere K, Benito J, Benzoni G, Blazhev A, Boso A, Bottoni S, Bunce M, Chakma R, Cieplicka-Oryńczak N, Courtin S, Cortés ML, Davies P, Delafosse C, Fallot M, Fornal B, Fraile L, Gottardo A, Guadilla V, Häfner G, Hauschild K, Heine M, Henrich C, Homm I, Ibrahim F, Iskra ŁW, Ivanov P, Jazrawi S, Korgul A, Koseoglou P, Kröll T, Kurtukian-Nieto T, Le Meur L, Leoni S, Ljungvall J, Lopez-Martens A, Lozeva R, Matea I, Miernik K, Nemer J, Oberstedt S, Paulsen W, Piersa M, Popovitch Y, Porzio C, Qi L, Ralet D, Regan PH, Rezynkina K, Sánchez-Tembleque V, Siem S, Schmitt C, Söderström PA, Sürder C, Tocabens G, Vedia V, Verney D, Warr N, Wasilewska B, Wiederhold J, Yavahchova M, Zeiser F, Ziliani S. Angular momentum generation in nuclear fission. Nature 2021; 590:566-570. [PMID: 33627809 DOI: 10.1038/s41586-021-03304-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 12/09/2020] [Indexed: 01/31/2023]
Abstract
When a heavy atomic nucleus splits (fission), the resulting fragments are observed to emerge spinning1; this phenomenon has been a mystery in nuclear physics for over 40 years2,3. The internal generation of typically six or seven units of angular momentum in each fragment is particularly puzzling for systems that start with zero, or almost zero, spin. There are currently no experimental observations that enable decisive discrimination between the many competing theories for the mechanism that generates the angular momentum4-12. Nevertheless, the consensus is that excitation of collective vibrational modes generates the intrinsic spin before the nucleus splits (pre-scission). Here we show that there is no significant correlation between the spins of the fragment partners, which leads us to conclude that angular momentum in fission is actually generated after the nucleus splits (post-scission). We present comprehensive data showing that the average spin is strongly mass-dependent, varying in saw-tooth distributions. We observe no notable dependence of fragment spin on the mass or charge of the partner nucleus, confirming the uncorrelated post-scission nature of the spin mechanism. To explain these observations, we propose that the collective motion of nucleons in the ruptured neck of the fissioning system generates two independent torques, analogous to the snapping of an elastic band. A parameterization based on occupation of angular momentum states according to statistical theory describes the full range of experimental data well. This insight into the role of spin in nuclear fission is not only important for the fundamental understanding and theoretical description of fission, but also has consequences for the γ-ray heating problem in nuclear reactors13,14, for the study of the structure of neutron-rich isotopes15,16, and for the synthesis and stability of super-heavy elements17,18.
Collapse
Affiliation(s)
- J N Wilson
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France.
| | - D Thisse
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Lebois
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - N Jovančević
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - D Gjestvang
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - R Canavan
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - M Rudigier
- Department of Physics, University of Surrey, Guildford, UK.,Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | | | - R-B Gerst
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | | | - E Adamska
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - P Adsley
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - A Algora
- IFIC, CSIC-University of Valencia, Valencia, Spain.,Institute for Nuclear Research (Atomki), Debrecen, Hungary
| | - M Babo
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - K Belvedere
- Department of Physics, University of Surrey, Guildford, UK
| | - J Benito
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | | | - A Blazhev
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - A Boso
- National Physical Laboratory, Teddington, UK
| | - S Bottoni
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| | - M Bunce
- National Physical Laboratory, Teddington, UK
| | - R Chakma
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | | | - S Courtin
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | | | - P Davies
- School of Physics and Astronomy, University of Manchester, Manchester, UK
| | - C Delafosse
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Fallot
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - B Fornal
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - L Fraile
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - A Gottardo
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
| | - V Guadilla
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - G Häfner
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France.,Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - K Hauschild
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Heine
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | - C Henrich
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - I Homm
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - F Ibrahim
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - Ł W Iskra
- INFN, Milan, Italy.,Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - P Ivanov
- National Physical Laboratory, Teddington, UK
| | - S Jazrawi
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - A Korgul
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - P Koseoglou
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany.,GSI Helmoltzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - T Kröll
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | | | - L Le Meur
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - S Leoni
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| | - J Ljungvall
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - A Lopez-Martens
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - R Lozeva
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - I Matea
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - K Miernik
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - J Nemer
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - S Oberstedt
- European Commission, Joint Research Centre, Geel, Belgium
| | - W Paulsen
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - M Piersa
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - Y Popovitch
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - C Porzio
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy.,TRIUMF, Vancouver, British Columbia, Canada
| | - L Qi
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - D Ralet
- Grand Accélérateur National d'Ions Lourds, Caen, France
| | - P H Regan
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - K Rezynkina
- Institute for Nuclear and Radiation Physics, Katholieke Universiteit Leuven, Leuven, Belgium
| | - V Sánchez-Tembleque
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - S Siem
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - C Schmitt
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | - P-A Söderström
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany.,Extreme Light Infrastructure-Nuclear Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest-Măgurele, Romania
| | - C Sürder
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - G Tocabens
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - V Vedia
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - D Verney
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - N Warr
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - B Wasilewska
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - J Wiederhold
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - M Yavahchova
- Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - F Zeiser
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - S Ziliani
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| |
Collapse
|
11
|
Popivanov G, Cirocchi R, Popov G, Stefanovski P, Andonova R, Kjossev K, Tonchev P, Tabakov M, Penkov M, Ivanov P, Mutafchiyski V. An analysis of missed cases with surgical emergencies admitted in non-surgical departments. Case series and а review of the literature. G Chir 2020; 41:66-72. [PMID: 32038014] [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: 06/10/2023]
Abstract
INTRODUCTION The delayed diagnosis in emergency surgery can be associated with significant morbidity and mortality and often lead to litigations. The aim of the present work is to analyse the outcome in cases with non-trauma surgical emergencies wrongly admitted in non-surgical departments. METHODS A retrospective trial in two independent University hospitals was conducted. The first group encompassed the patients worked-up in the Surgical unit of Emergency department (2014-2018). The second one included all cases visited Emergency department (2018). Only cases with acute abdomen and delayed diagnosis and operation were included. The analysis included the proportion of the delayed diagnosis, time between admission and operation, intraoperative diagnosis, complications and mortality rate. RESULTS In the first group there were 30 194 visits in the surgical unit with 15 836 hospitalizations (52.4%). Twenty patients of the last (0.13%) were admitted in the Clinic of Infectious disease and subsequently operated. The mean delay between hospitalization and operation was 3 days (1-10). Seventeen patients (85%) were operated with mortality of 10%. In the second group, there were a total of 22 760 visits with 11 562 discharged cases. Of the last, 1.7% (n=192) were re-admitted in a surgical ward, 25 of which underwent urgent surgery (0.2%). CONCLUSIONS The missed surgical cases represent only a small proportion of the patients in emergency department. The causes for wrong initial admissions in our series were misinterpretation of the symptoms, insufficient clinical examination and underuse of US and CT. The careful clinical assessment, point-of care US and CT may decrease the rate of the delayed diagnosis.
Collapse
|
12
|
Collins SM, Shearman R, Ivanov P, Regan PH. The impact of high-energy tailing in high-purity germanium gamma-ray spectrometry on the activity determination of 224Ra using the 241.0 keV emission. Appl Radiat Isot 2019; 157:109021. [PMID: 31889679 DOI: 10.1016/j.apradiso.2019.109021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 10/15/2019] [Accepted: 12/05/2019] [Indexed: 02/03/2023]
Abstract
High-energy tailing is an often-overlooked component in high-purity germanium gamma-ray spectrometry when performing the non-linear least squares fit of a full-energy peak. This component comes from the incomplete restoration of the baseline prior to the next pulse being processed and therefore is an issue of increased count rates. In the current work, the impact of this oversight is shown through the dynamics and decay characteristics of 224Ra and its radioactive decay progeny. Multiple measurements of two samples, separated from the decay progeny and at differing activities, have been made. The results of full-energy peak fitting of the convoluted 238.6 keV and 241.0 keV full-energy peaks with and without the high energy tailing component are presented. Trends in the observed activity that approximate the ingrowth of 212Pb have been observed where no high-energy tailing component is used, with maximum relative differences of 2% and 5% determined.
Collapse
Affiliation(s)
- S M Collins
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK; Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, UK.
| | - R Shearman
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK
| | - P Ivanov
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK
| | - P H Regan
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK; Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, UK
| |
Collapse
|
13
|
García-Toraño E, Crespo T, Marouli M, Jobbágy V, Pommé S, Ivanov P. Alpha-particle emission probabilities of 231Pa derived from first semiconductor spectrometric measurements. Appl Radiat Isot 2019; 154:108863. [PMID: 31513990 DOI: 10.1016/j.apradiso.2019.108863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 08/12/2019] [Accepted: 08/14/2019] [Indexed: 11/24/2022]
Abstract
The nuclide 231Pa is a member of the 235U decay chain. It is a complex alpha emitter with 25 identified alpha emissions. Formerly published alpha-particle emission probabilities were derived from measurements taken with magnetic spectrometers. This work presents the first measurements made with semiconductor detectors. High-resolution alpha-particle spectrometry was carried out at CIEMAT and JRC using ion-implanted planar silicon detectors. Alpha-particle emission probabilities of 23 transitions were derived from deconvolutions of the spectra. For the major lines, uncertainties are lower than 1%, a significant improvement to existing data. The new data set will allow a more accurate evaluation of the decay scheme of 231Pa.
Collapse
Affiliation(s)
| | - T Crespo
- Ciemat, Avenida Complutense 40, 28040, Madrid, Spain
| | - M Marouli
- European Commission, Joint Research Centre (JRC), Geel, Belgium
| | - V Jobbágy
- European Commission, Joint Research Centre (JRC), Geel, Belgium
| | - S Pommé
- European Commission, Joint Research Centre (JRC), Geel, Belgium
| | - P Ivanov
- National Physical Laboratory (NPL), Teddington, UK
| |
Collapse
|
14
|
Webster B, Ivanov P, Russell B, Collins S, Stora T, Ramos JP, Köster U, Robinson AP, Read D. Chemical Purification of Terbium-155 from Pseudo-Isobaric Impurities in a Mass Separated Source Produced at CERN. Sci Rep 2019; 9:10884. [PMID: 31350422 PMCID: PMC6659625 DOI: 10.1038/s41598-019-47463-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 07/11/2019] [Indexed: 12/17/2022] Open
Abstract
Four terbium radioisotopes (149, 152, 155, 161Tb) constitute a potential theranostic quartet for cancer treatment but require any derived radiopharmaceutical to be essentially free of impurities. Terbium-155 prepared by proton irradiation and on-line mass separation at the CERN-ISOLDE and CERN-MEDICIS facilities contains radioactive 139Ce16O and also zinc or gold, depending on the catcher foil used. A method using ion-exchange and extraction chromatography resins in two column separation steps has been developed to isolate 155Tb with a chemical yield of ≥95% and radionuclidic purity ≥99.9%. Conversion of terbium into a form suitable for chelation to targeting molecules in diagnostic nuclear medicine is presented. The resulting 155Tb preparations are suitable for the determination of absolute activity, SPECT phantom imaging studies and pre-clinical trials.
Collapse
Affiliation(s)
- Ben Webster
- National Physical Laboratory, Teddington, TW11 0LW, UK.,Department of Chemistry, University of Surrey, Guildford, GU2 7XH, UK
| | - Peter Ivanov
- National Physical Laboratory, Teddington, TW11 0LW, UK.
| | - Ben Russell
- National Physical Laboratory, Teddington, TW11 0LW, UK
| | - Sean Collins
- National Physical Laboratory, Teddington, TW11 0LW, UK
| | - Thierry Stora
- CERN - European Organization for Nuclear Research, Esplanade des Particules 1, 1217, Meyrin, Switzerland
| | - Joao Pedro Ramos
- CERN - European Organization for Nuclear Research, Esplanade des Particules 1, 1217, Meyrin, Switzerland.,KU Leuven, Institute for Nuclear and Radiation Physics, Celestijnenlaan 200D, 3001, Heverlee, Belgium
| | - Ulli Köster
- Institut Laue-Langevin, 38042, Grenoble, France
| | - Andrew Paul Robinson
- National Physical Laboratory, Teddington, TW11 0LW, UK.,Christie Medical Physics and Engineering (CMPE), The Christie NHS Foundation Trust, Manchester, M20 4BX, UK.,University of Manchester, Manchester, M13 9PL, UK
| | - David Read
- National Physical Laboratory, Teddington, TW11 0LW, UK.,Department of Chemistry, University of Surrey, Guildford, GU2 7XH, UK
| |
Collapse
|
15
|
Collins SM, Keightley JD, Ivanov P, Arinc A, Fenwick AJ, Pearce AK. The potential radio-immunotherapeutic α-emitter 227Th – part II: Absolute γ-ray emission intensities from the excited levels of 223Ra. Appl Radiat Isot 2019; 145:251-257. [PMID: 30686576 DOI: 10.1016/j.apradiso.2018.10.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 09/17/2018] [Accepted: 10/23/2018] [Indexed: 11/28/2022]
Affiliation(s)
- S M Collins
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom.
| | - J D Keightley
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom
| | - P Ivanov
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom
| | - A Arinc
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom
| | - A J Fenwick
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom
| | - A K Pearce
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom
| |
Collapse
|
16
|
Chang Y, Ziegler M, Ignatova D, Ivanov P, Profanter R, Kerl K, Hafner J, Clark R, Dummer R, Contassot E, French L, Misailovic S, Cozzio A, Vechev M, Hoetzenecker W, Guenova E. Upregulation of HLA I on tumor skin T lymphocytes as a tumor immune escape mechanism in CTCL. Eur J Cancer 2019. [DOI: 10.1016/s0959-8049(19)30552-0] [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: 10/26/2022]
|
17
|
Collins SM, Keightley JD, Ivanov P, Arinc A, Jerome SM, Fenwick AJ, Pearce AK. The potential radio-immunotherapeutic α-emitter 227Th - part I: Standardisation via primary liquid scintillation techniques and decay progeny ingrowth measurements. Appl Radiat Isot 2018; 145:240-250. [PMID: 30583971 DOI: 10.1016/j.apradiso.2018.12.012] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 11/20/2018] [Accepted: 12/07/2018] [Indexed: 10/27/2022]
Abstract
Thorium-227 is a potential therapeutic radionuclide for applications in targeted α-radioimmunotherapy for the treatment of various types of cancer. To provide nuclear medicine departments involved in Phase I clinical trials traceability to the SI unit of radioactivity (Bq), a standardisation of a radiochemically pure 227Th aqueous solution has been performed at the National Physical Laboratory. This was achieved via two primary liquid scintillation (LS) techniques -4π(LS)-γ digital coincidence counting (DCC) and 4π LS counting. These absolute techniques were supported by the indirect determination of the 227Th activity via the measurement of the ingrowth and decay rate of the decay progeny by both ionisations chambers and high purity germanium (HPGe) gamma-ray spectrometry. The results of the primary techniques were found to be consistent, both with each other (zeta score = 1.1) and to the decay progeny ingrowth measurements. An activity per unit mass of 20.726 (51) kBq g-1 was determined for the solution. A procedure has been developed that provided an effective separation of the 227Th from its decay progeny, which was shown by the effective time zero of the 227Th-223Ra nuclear chronometer measured by HPGe gamma-ray spectrometry.
Collapse
Affiliation(s)
- S M Collins
- National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.
| | - J D Keightley
- National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - P Ivanov
- National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - A Arinc
- National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - S M Jerome
- National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - A J Fenwick
- National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - A K Pearce
- National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| |
Collapse
|
18
|
Sheveleva A, Ivanov P, Gasanova T, Osipov G, Chirkov S. Sequence Analysis of Plum pox virus Strain C Isolates from Russia Revealed Prevalence of the D96E Mutation in the Universal Epitope and Interstrain Recombination Events. Viruses 2018; 10:E450. [PMID: 30142962 PMCID: PMC6164383 DOI: 10.3390/v10090450] [Citation(s) in RCA: 9] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 08/13/2018] [Accepted: 08/22/2018] [Indexed: 12/01/2022] Open
Abstract
The understanding of genetic diversity, geographic distribution, and antigenic properties of Plum pox virus (PPV) is a prerequisite to improve control of sharka, the most detrimental viral disease of stone fruit crops worldwide. Forty new PPV strain C isolates were detected in sour cherry (Prunus cerasus) from three geographically distant (700⁻1100 km) regions of European Russia. Analysis of their 3'-terminal genomic sequences showed that nineteen isolates (47.5%) bear the D96E mutation in the universal epitope of the coat protein. Almost all of them cannot be detected by the monoclonal antibody 5B in triple antibody sandwich enzyme-linked immunosorbent assayand Western blot analysis that may potentially compromise serological PPV detection in cherries. Full-length genomes of seven PPV-C isolates were determined employing next-generation sequencing. Using the Recombination Detection Program (RDP4), the recombination event covering the region from (Cter)P1 to the middle of the HcPro gene was predicted in all the available PPV-C complete genomes. The isolates Tat-4, belonging to the strain CV, and RU-17sc (PPV-CR) were inferred as major and minor parents, respectively, suggesting possible pathways of evolution of the cherry-adapted strains. Downy cherry (P. tomentosa) was identified as the natural PPV-C host for the first time.
Collapse
Affiliation(s)
- Anna Sheveleva
- Department of Virology, Faculty of Biology, Lomonosov Moscow State University, Moscow 119234, Russia.
| | - Peter Ivanov
- Department of Virology, Faculty of Biology, Lomonosov Moscow State University, Moscow 119234, Russia.
| | - Tatiana Gasanova
- Department of Virology, Faculty of Biology, Lomonosov Moscow State University, Moscow 119234, Russia.
| | - Gennady Osipov
- Tatar Research Institute of Agriculture, Kazan 420059, Russia.
| | - Sergei Chirkov
- Department of Virology, Faculty of Biology, Lomonosov Moscow State University, Moscow 119234, Russia.
| |
Collapse
|
19
|
Aboagye E, Aigbirhio F, Allott L, Anderson E, Artelsmair M, Audisio D, Audisio J, Bragg R, Brindle K, Bulat F, Bürli R, Carroll L, Chapdelaine M, Collins S, Cortezon-Tamarit F, Da Pieve C, Davies J, Decuypere E, Defay T, DeFrees S, Dilworth J, Duckett S, Dugave C, Elhabiri M, Elmore C, Fairlamb I, Fenwick A, Forsback S, Ge H, Geach N, Gouverneur V, Gregson T, Gu C, Ivanov P, Kagoro M, Kerr W, Kidd G, Knox G, Kolodych S, Koniev O, Krzyczmonik A, Lawrie K, Leeper F, Lewis R, Little G, Liu H, Lockley W, Mekareeya A, Mirabello V, Morrissey C, Neves A, Pascu S, Paton R, Plougastel L, Poot A, Puhalo N, Read D, Reid M, Robinson A, Sardana M, Sarpaki S, Schou M, Simmonds A, Smith G, Solin J, Soloviev D, Talbot E, Taran F, Turton D, Tuttle T, Venanzi N, Vugts D, Wagner A, Wang L, Webster B, White R, Willis C, Windhorst A, Winfield C, Xie B. Abstracts of the 26th international isotope society (UK group) symposium: Synthesis & applications of labelled compounds 2017. J Labelled Comp Radiopharm 2018. [DOI: 10.1002/jlcr.3641] [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: 11/10/2022]
|
20
|
Chang Y, Ziegler M, Ignatova D, Ivanov P, Profanter R, Kerl K, Dummer R, Contassot E, French L, Cozzio A, Misailovic S, Hoetzenecker W, Vechev M, Guenova E. 1032 HLA I shield tumor skin T lymphocytes from NK-cell-mediated elimination. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.1044] [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: 10/17/2022]
|
21
|
Zubatkina I, Ivanov P. EP-1229: Early response of melanoma brain metastases to radiosurgery as important indicator of tumor behavior. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31539-1] [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]
|
22
|
Ivanov P, Zubatkina I, Kuzmin A, Nikitin D, Krasnyuk V, Andreev G, Schepinov F. OC-0592: Hypofractionated stereotactic radiotherapy of large brain metastases: analysis of 350 patients. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)30902-2] [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: 11/25/2022]
|
23
|
Chirkov S, Sheveleva A, Ivanov P, Zakubanskiy A. Analysis of Genetic Diversity of Russian Sour Cherry Plum pox virus Isolates Provides Evidence of a New Strain. Plant Dis 2018; 102:569-575. [PMID: 30673474 DOI: 10.1094/pdis-07-17-1104-re] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Plum pox virus (PPV) exists as a complex of nine strains adapted to different Prunus hosts. Unusual PPV isolates that do not belong to the known cherry-adapted strains were discovered on sour cherry in Russia. Here, two complete genomes of isolates Tat-2 and Tat-4 were determined by sequencing on the Illumina HiSeq 2500 platform. Both were composed of 9,792 nucleotides, excluding the poly(A) tail, with the organization typical of PPV and had 99.4 and 99.7% identity between each other at the nucleotide and amino acid levels. The sequence identities between Tat-2/Tat-4 and known PPV strains ranged from 77.6 to 83.3% for genomic RNA and from 80.0 to 93.8% for polyprotein. Phylogenetic analysis placed Tat-2 and Tat-4 in a separate clade, distinct from the C and CR strains. Three more Tat-2/Tat-4-like isolates were detected in local cherry plantings using the newly developed, specific RT-PCR assay. Based on the phylogenetic analysis, sequence identities, and environmental distribution, Tat-2, Tat-4, and related isolates represent a new cherry-adapted PPV strain for which the name PPV-CV (Cherry Volga) is proposed.
Collapse
Affiliation(s)
- Sergei Chirkov
- Lomonosov Moscow State University, 119234 Moscow, Russia
| | - Anna Sheveleva
- Lomonosov Moscow State University, 119234 Moscow, Russia
| | - Peter Ivanov
- Lomonosov Moscow State University, 119234 Moscow, Russia
| | | |
Collapse
|
24
|
|
25
|
Chirkov S, Ivanov P, Sheveleva A, Kudryavtseva A, Mitrofanova I. Molecular characterization of Plum pox virus Rec isolates from Russia suggests a new insight into evolution of the strain. Virus Genes 2018; 54:328-332. [PMID: 29460128 DOI: 10.1007/s11262-018-1541-8] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 02/11/2018] [Indexed: 11/29/2022]
Abstract
Field isolates of Plum pox virus (PPV), belonging to the strain Rec, have been found for the first time in Russia. Full-size genomes of the isolates K28 and Kisl-1pl from myrobalan and plum, respectively, were sequenced on the 454 platform. Analysis of all known PPV-Rec complete genomes using the Recombination Detection Program (RDP4) revealed yet another recombination event in the 5'-terminal region. This event was detected by seven algorithms, implemented in the RDP4, with statistically significant P values and supported by a phylogenetic analysis with the bootstrap value of 87%. A putative PPV-M-derived segment, encompassing the C-terminus of the P1 gene and approximately two-thirds of the HcPro gene, is bordered by breakpoints at positions 760-940 and 1838-1964, depending on the recombinant isolate. The predicted 5'-distal breakpoint for the isolate Valjevka is located at position 2804. The Dideron (strain D) and SK68 (strain M) isolates were inferred as major and minor parents, respectively. Finding of another recombination event suggests more complex evolutionary history of PPV-Rec than previously assumed. Perhaps the first recombination event led to the formation of a PPV-D variant harboring the PPV-M-derived fragment within the 5'-proximal part of the genome. Subsequent recombination of its descendant with PPV-M in the 3'-proximal genomic region resulted in the emergence of the evolutionary successful strain Rec.
Collapse
Affiliation(s)
- Sergei Chirkov
- Lomonosov Moscow State University, Moscow, 119234, Russia.
| | - Peter Ivanov
- Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Anna Sheveleva
- Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Anna Kudryavtseva
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Irina Mitrofanova
- Nikita Botanical Gardens - National Scientific Center, Yalta, 298648, Russia
| |
Collapse
|
26
|
Mohamud H, Ivanov P, Russell BC, Regan PH, Ward NI. Selective sorption of uranium from aqueous solution by graphene oxide-modified materials. J Radioanal Nucl Chem 2018; 316:839-848. [PMID: 29725152 PMCID: PMC5920007 DOI: 10.1007/s10967-018-5741-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Indexed: 11/25/2022]
Abstract
The effect of competing ions on the sorption behaviour of uranium onto carboxyl-functionalised graphene oxide (COOH-GO) were studied in batch experiments in comparison to graphene oxide (GO) and graphite. The effect of increasing the abundance of select chemical functional groups, such as carboxyl groups, on the selectivity of U sorption was investigated. In the course of the study, COOH-GO demonstrated superior performance as a sorbent material for the selective removal of uranyl ions from aqueous solution with a distribution coefficient of 3.72 ± 0.19 × 103 mL g−1 in comparison to 3.97 ± 0.5 × 102 and 2.68 ± 0.2 × 102 mL g−1 for GO and graphite, respectively.
Collapse
Affiliation(s)
- H. Mohamud
- Department of Chemistry, University of Surrey, Guildford, GU2 7XH UK
- National Physical Laboratory, Hampton Road, Teddington, TW11 OLW UK
| | - P. Ivanov
- National Physical Laboratory, Hampton Road, Teddington, TW11 OLW UK
| | - B. C. Russell
- National Physical Laboratory, Hampton Road, Teddington, TW11 OLW UK
| | - P. H. Regan
- National Physical Laboratory, Hampton Road, Teddington, TW11 OLW UK
- Department of Physics, University of Surrey, Guildford, GU2 7XH UK
| | - N. I. Ward
- Department of Chemistry, University of Surrey, Guildford, GU2 7XH UK
| |
Collapse
|
27
|
Aboagye E, Alger K, Archibald S, Bakar N, Barton N, Bergare J, Bloom J, Bragg R, Burke B, Burns M, Carroll L, Calatayud D, Cawthorne C, Cortezon-Tamarit F, Crean C, Crump M, Dilworth J, Domarkas J, Duckett S, Eggleston I, Elmore C, van Es E, Fekete M, Goodwin M, Green G, Grönberg G, Hayes C, Hayes M, Hollis S, Hueting R, Ivanov P, Johnston G, Kerr W, Kohler A, Knox G, Lawrie K, Lee R, Lewis W, Lin B, Lockley W, López-Torres E, Lv K, Maddocks S, Marsh B, Mendiola A, Mirabello V, Miranda C, Norcott P, O'Hagan D, Olaru A, Pascu S, Rayner P, Read D, Ridge K, Ritter T, Roberts I, Samuri N, Sarpaki S, Somers D, Taylor R, Tuttle T, Varcoe J, Willis C. Abstracts of the 25th
International Isotope Society (UK Group) symposium: Synthesis and applications of labelled compounds 2016. J Labelled Comp Radiopharm 2017. [DOI: 10.1002/jlcr.3523] [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: 11/07/2022]
|
28
|
Mohamud H, van Es E, Sainsbury T, Ivanov P, Russell B, Regan P, Ward N. Progress towards the development of a rapid analytical approach for separation of 226 Ra using dibenzo-18-crown-6 ether functionalised silica (SiO 2 ) disks. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2017.02.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
29
|
Larijani C, Jerome S, Lorusso G, Ivanov P, Russell B, Pearce A, Regan P. Progress on the chemical separation of fission fragments from 236 Np produced by proton irradiation of natural uranium target. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2017.02.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
30
|
van Es E, Russell B, Ivanov P, Read D. Development of a method for rapid analysis of Ra-226 in groundwater and discharge water samples by ICP-QQQ-MS. Appl Radiat Isot 2017; 126:31-34. [DOI: 10.1016/j.apradiso.2017.02.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 12/02/2016] [Accepted: 02/11/2017] [Indexed: 10/20/2022]
|
31
|
Dean J, Collins S, Garcia Miranda M, Ivanov P, Larijani C, Woods S. Consensus evaluation of radioactivity-in-soil reference materials in the context of an NPL Environmental Radioactivity Proficiency Test Exercise. Appl Radiat Isot 2017; 126:263-266. [DOI: 10.1016/j.apradiso.2017.01.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 12/02/2016] [Accepted: 01/24/2017] [Indexed: 10/20/2022]
|
32
|
Ivanov P, Mu J, Leay L, Chang SY, Sharrad CA, Masters AJ, Schroeder SLM. Organic and Third Phase in HNO3/TBP/n-Dodecane System: No Reverse Micelles. Solvent Extraction and Ion Exchange 2017. [DOI: 10.1080/07366299.2017.1336048] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- P. Ivanov
- Nuclear Metrology Group, National Physical Laboratory, Middlesex, Teddington, UK
| | - J. Mu
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, UK
| | - L. Leay
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, UK
- Research Centre for Radwaste and Decommissioning, Dalton Nuclear Institute, University of Manchester, Manchester, UK
| | - S.-Y. Chang
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, UK
- Diamond Light Source Ltd., Didcot, Oxfordshire, UK
| | - C. A. Sharrad
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, UK
- Research Centre for Radwaste and Decommissioning, Dalton Nuclear Institute, University of Manchester, Manchester, UK
| | - A. J. Masters
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, UK
| | - S. L. M. Schroeder
- School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, UK
- Diamond Light Source Ltd., Didcot, Oxfordshire, UK
- School of Chemical and Process Engineering, University of Leeds, Leeds, UK
| |
Collapse
|
33
|
Russell B, García-Miranda M, Ivanov P. Development of an optimised method for analysis of 90Sr in decommissioning wastes by triple quadrupole inductively coupled plasma mass spectrometry. Appl Radiat Isot 2017; 126:35-39. [PMID: 28153436 DOI: 10.1016/j.apradiso.2017.01.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [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: 08/15/2016] [Revised: 11/23/2016] [Accepted: 01/23/2017] [Indexed: 10/20/2022]
Abstract
The ongoing development of an optimised procedure for the measurement of 90Sr in decommissioning samples using the latest generation triple quadrupole inductively coupled plasma mass spectrometry (ICP-QQQ-MS) is presented. The procedure incorporates digestion, and separation from interferences using a combination of wet chemical and instrument-based separation using the ICP-QQQ-MS reaction cell. The key factors under study are the procedural time and limits of detection achievable compared to existing radiometric techniques.
Collapse
Affiliation(s)
- B Russell
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK.
| | - M García-Miranda
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| | - P Ivanov
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
| |
Collapse
|
34
|
Taylor RJE, Ivanov P, Li G, Childs DTD, Hogg RA. Optimisation of photonic crystal coupling through waveguide design. Opt Quantum Electron 2017; 49:47. [PMID: 32269407 PMCID: PMC7115092 DOI: 10.1007/s11082-016-0888-0] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Accepted: 12/29/2016] [Indexed: 06/11/2023]
Abstract
This paper considers multiple structural designs for photonic crystal surface emitting lasers operating at key wavelengths. Initially a structure from Williams et al. is modelled, the structure is modified to include an additional GaAs waveguide layer (termed ballast layer) and to include an additional PC layer (termed double decker). These structures are modelled by a combination of coupling calculation and waveguide modelling and are compared to the original structure. We show that both of these schemes give an increase in coupling, but present fabrication challenges. Next, we model standard laser structures operating at key wavelengths (400 nm, 1.3 and 10 µm) where a photonic crystal is located above the active region and explore the effect of increasing thickness of photonic crystal. We find that increasing the thickness increases the coupling coefficient but not true for the full range of thicknesses considered. This study allows a more universal comparison of the use of all-semiconductor, or void containing PCSELs to be conducted and we find that the realisation of all semiconductor PCSELs covering a wide range of material and wavelengths are possible.
Collapse
Affiliation(s)
- R. J. E. Taylor
- Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, S3 7HQ UK
- Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo, 7-3-Hongo, Bunkyo-ku, Tokyo, 113-8656 Japan
| | - P. Ivanov
- Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, S3 7HQ UK
- School of Engineering, The University of Glasgow, Glasgow, G12 8LT UK
| | - G. Li
- Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, S3 7HQ UK
- School of Engineering, The University of Glasgow, Glasgow, G12 8LT UK
| | - D. T. D. Childs
- Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, S3 7HQ UK
- School of Engineering, The University of Glasgow, Glasgow, G12 8LT UK
| | - R. A. Hogg
- Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, S3 7HQ UK
- School of Engineering, The University of Glasgow, Glasgow, G12 8LT UK
| |
Collapse
|
35
|
Zubatkina I, Ivanov P, Tumarova D, Andreev G. EP-1393: Radiological responses of melanoma brain metastases to radiosurgery and patient prognosis. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32643-3] [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]
|
36
|
Ivanov P, Zubatkina I, Andreev G. PO-0643: Stereotactic hypofractionation in combination with radiosurgery in the treatment of brain metastases. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)31893-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: 11/17/2022]
|
37
|
Lorusso G, Shearman R, Regan PH, Judge SM, Bell S, Collins SM, Larijani C, Ivanov P, Jerome SM, Keightley JD, Lalkovski S, Pearce AK, Podolyak Z. Development of the NPL gamma-ray spectrometer NANA for traceable nuclear decay and structure studies. Appl Radiat Isot 2016; 109:507-511. [PMID: 26795270 DOI: 10.1016/j.apradiso.2015.12.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 12/17/2015] [Indexed: 11/18/2022]
Abstract
We present a brief report on the progress towards the construction of the National Nuclear Array (NANA), a gamma-ray coincidence spectrometer for discrete-line nuclear structure and decay measurements. The proposed spectrometer will combine a gamma-ray energy resolution of approximately 3% at 1MeV with sub-nanosecond timing discrimination between successive gamma rays in mutually coincident decay cascades. We also review a number of recent measurements using coincidence fast-timing gamma-ray spectroscopy for nuclear structure studies, which have helped to inform the design criteria for the NANA spectrometer.
Collapse
Affiliation(s)
- G Lorusso
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK; Department of Physics, University of Surrey, Guildford GU2 7XH, UK
| | - R Shearman
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK; Department of Physics, University of Surrey, Guildford GU2 7XH, UK
| | - P H Regan
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK; Department of Physics, University of Surrey, Guildford GU2 7XH, UK.
| | - S M Judge
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK; Department of Physics, University of Surrey, Guildford GU2 7XH, UK
| | - S Bell
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK; Department of Physics, University of Surrey, Guildford GU2 7XH, UK
| | - S M Collins
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK
| | - C Larijani
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK; Department of Physics, University of Surrey, Guildford GU2 7XH, UK
| | - P Ivanov
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK
| | - S M Jerome
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK
| | - J D Keightley
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK
| | - S Lalkovski
- Department of Physics, University of Surrey, Guildford GU2 7XH, UK
| | - A K Pearce
- Department of Physics, University of Surrey, Guildford GU2 7XH, UK
| | - Zs Podolyak
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK
| |
Collapse
|
38
|
Komsa-Penkova R, Kovacheva K, Ivanov P. [FETAL LOSSES DURING THE MATURATION OF THE PLACENTA AND THE RELATIONSHIP WITH SOME PROCOAGULANT CONDITIONS.]. Akush Ginekol (Sofiia) 2016; 55:3-9. [PMID: 29790708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Among the major causes and risk factors for fetal loss are chromosomal abnormalities, genetic syndromes, placental abnormalities, thrombophilia (FVL, Fil G20210A, C677T MTHFR, PAl-1 4G /-5G), infection and inflammation (IL-3, IL-4, IL-17, IL-10), antiphospholipid syndrome, maternal diseases such as hypertension, diabetes and obesity. Pregnancy is a prothrombotic state as a result of specific physiological changes with multifactorial ethio-pathogenesis, leading to increased procoagulant factors and structural changes turned a sTasis, inflammatory component and contribution of individual genetic and acquired thrombophilic risk factors. Understanding of the molecular mechanisms of control over the process of embryogenesis, placentation and fetal development and impact of the factors of hemodtasis, inflammation and apoptosis, contributes to the application- of appropriate therapy and increase the chance of successful completion of pregnancy.
Collapse
|
39
|
Chirkov S, Ivanov P, Sheveleva A, Kudryavtseva A, Prikhodko Y, Mitrofanova I. Occurrence and characterization of plum pox virus strain D isolates from European Russia and Crimea. Arch Virol 2015; 161:425-30. [PMID: 26530833 DOI: 10.1007/s00705-015-2658-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 10/21/2015] [Indexed: 10/22/2022]
Abstract
Numerous plum pox virus (PPV) strain D isolates have been found in geographically distant regions of European Russia and the Crimean peninsula on different stone fruit hosts. Phylogenetic analysis of their partial and complete genomes suggests multiple introductions of PPV-D into Russia. Distinct natural isolates from Prunus tomentosa were found to bear unique amino acid substitutions in the N-terminus of the coat protein (CP) that may contribute to the adaptation of PPV-D to this host. Serological analysis using the PPV-D-specific monoclonal antibody 4DG5 provided further evidence that mutations at positions 58 and 59 of the CP are crucial for antibody binding.
Collapse
Affiliation(s)
| | - Peter Ivanov
- Lomonosov Moscow State University, Moscow, Russia
| | | | - Anna Kudryavtseva
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia
| | | | | |
Collapse
|
40
|
Larijani C, Pickford O, Collins S, Ivanov P, Jerome S, Keightley J, Pearce A, Regan P. Progress towards the production of the 236gNp standard sources and competing fission fragment production. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2015.01.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
41
|
Taylor RJE, Childs DTD, Ivanov P, Stevens BJ, Babazadeh N, Crombie AJ, Ternent G, Thoms S, Zhou H, Hogg RA. Electronic control of coherence in a two-dimensional array of photonic crystal surface emitting lasers. Sci Rep 2015; 5:13203. [PMID: 26289621 PMCID: PMC4542471 DOI: 10.1038/srep13203] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [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: 04/07/2015] [Accepted: 07/14/2015] [Indexed: 11/15/2022] Open
Abstract
We demonstrate a semiconductor PCSEL array that uniquely combines an in-plane waveguide structure with nano-scale patterned PCSEL elements. This novel geometry allows two-dimensional electronically controllable coherent coupling of remote vertically emitting lasers. Mutual coherence of the PCSEL elements is verified through the demonstration of a two-dimensional Young’s Slits experiment. In addition to allowing the all-electronic control of the interference pattern, this type of device offers new routes to power and brightness scaling in semiconductor lasers, and opportunities for all-electronic beam steering.
Collapse
Affiliation(s)
- R J E Taylor
- Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - D T D Childs
- Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - P Ivanov
- Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - B J Stevens
- Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - N Babazadeh
- Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - A J Crombie
- Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - G Ternent
- James Watt Nanofabrication Centre, James Watt Building, University of Glasgow, University Avenue, Glasgow G12 8QQ
| | - S Thoms
- James Watt Nanofabrication Centre, James Watt Building, University of Glasgow, University Avenue, Glasgow G12 8QQ
| | - H Zhou
- James Watt Nanofabrication Centre, James Watt Building, University of Glasgow, University Avenue, Glasgow G12 8QQ
| | - R A Hogg
- Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| |
Collapse
|
42
|
Ivanov P, Lukanov T, Konova E, Blajeva S, Rilcheva V, Tsvyatkovska T, Kovacheva K. [ACTIVATION OF PERIPHERAL NATURAL KILLER CELLS IN WOMEN WITH REPEATED EARLY PREGNANCY LOSS]. Akush Ginekol (Sofiia) 2015; 54:3-7. [PMID: 27032227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The increased number of peripheral blood NK (pNK) cells has been discussed as a factor for embryo implantation failure and early pregnancy loss. However, the assessment of activated pNK cells with increased cytotoxic activity could be a distinct marker for immune dysregulation leading to pregnancy complications. CD69 membrane receptor expression has been measured by flow cytometry in different subtypes of pNK cells in 55 women with two or more pregnancy loss between six and twelve week of gestation with absence of any hormonal, anatomical or inherited cause for pregnancy loss and in 43 healthy women with at least one delivery at term and no history for reproductive failure. Increased expression of CD69 in CD56 positive pNK cells was found in the study group compared to controls (12.2% versus 6.5%, p<0.005). In addition, the subpopulation of CD56dim and CD56brightpNK cells in women with recurrent pregnancy loss showed increased percent of CD69 activation marker expression compared to controls (respectively 13.2% versus 7.2 p<0.005; and 4.6% versus 3.1% p=0.04). CD56brightCD16negative pNK cells (identical with those in uterine endometrium) in the investigated group has been found with higher CD69 expression compared to controls (3.3% versus 1.7%, p=0.03). Primary dysregulation in NK cells activity could be supposed in women with repeated early pregnancy loss without another underlined pathology. Investigation of active status of NK cells but not only NK cell count could be evaluation marker of impaired immunology regulation in early pregnancy development.
Collapse
MESH Headings
- Abortion, Habitual/immunology
- Adult
- Antigens, CD/analysis
- Antigens, CD/immunology
- Antigens, Differentiation, T-Lymphocyte/analysis
- Antigens, Differentiation, T-Lymphocyte/immunology
- CD56 Antigen/analysis
- CD56 Antigen/immunology
- Embryo Implantation
- Female
- Humans
- Killer Cells, Natural/immunology
- Lectins, C-Type/analysis
- Lectins, C-Type/immunology
- Lymphocyte Activation
- Lymphocyte Count
- Pregnancy
- Young Adult
Collapse
|
43
|
Ivanov P, Konova E, Blajeva S, Lukanov T, Angelova P, Georgieva V, Totev V, Komsa-Penkova R. [SEX HORMONE INFLUENCE ON PERIPHERAL NATURAL KILLER CELLS COUNT]. Akush Ginekol (Sofiia) 2015; 54:3-7. [PMID: 27025100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Proper evaluation of immunological factors connected with pregnancy establishment increased the possibility for exact treatment in high risk gestation cases. Hormonal changes during an ovarian cycle may affect immune response, which is crucial for the embryonic implantation. Peripheral Natural killer (pNK) cells are key components of immune systems and their activities could be regulated by sex hormones. In the present study we investigated the effects of estrogen fluctuation on the number of NK cells in vivo during the early follicular and middle luteal phase of menstrual cycle. In 63 healthy women with at least one full term pregnancy and regular menstrual cycle with duration between 24 and 32 days, blood samples have been collected twice for investigation of CD3/CD16/CD56 positive lymphocytes. The mean pNK count in follicular phase was 11.6% with 4.7% variation. The median was 10.6%. The mean pNK count in luteal phase was 12.1% with 5.1% variation, respectively median for cell number 11.8%. The two-tailed t-test comparison did not find any statistical difference despite the slight elevation of pNK cells count in luteal phase. The insignificant variation in pNK cells count objected the suggestion to evaluate immunological status in women with adverse pregnancy outcome in specific phase of menstrual cycle.
Collapse
|
44
|
Jerome SM, Ivanov P, Larijani C, Parker DJ, Regan PH. The production of Neptunium-236g. J Environ Radioact 2014; 138:315-322. [PMID: 24731718 DOI: 10.1016/j.jenvrad.2014.02.029] [Citation(s) in RCA: 5] [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: 10/16/2013] [Revised: 02/21/2014] [Accepted: 02/27/2014] [Indexed: 06/03/2023]
Abstract
Radiochemical analysis of (237)Np is important in a number of fields, such as nuclear forensics, environmental analysis and measurements throughout the nuclear fuel cycle. However analysis is complicated by the lack of a stable isotope of neptunium. Although various tracers have been used, including (235)Np, (239)Np and even (236)Pu, none are entirely satisfactory. However, (236g)Np would be a better candidate for a neptunium yield tracer, as its long half-life means that it is useable as both a radiometric and mass spectrometric measurements. This radionuclide is notoriously difficult to prepare, and limited in scope. In this paper, we examine the options for the production of (236g)Np, based on work carried out at NPL since 2011. However, this work was primarily aimed at the production of (236)Pu, and not (236g)Np and therefore the rate of production are based on the levels of (236)Pu generated in the irradiation of (i) (238)U with protons, (ii) (235)U with deuterons, (iii) (236)U with protons and (iv) (236)U with deuterons. The derivation of a well-defined cross section is complicated by the relevant paucity of information on the variation of the (236m)Np:(236g)Np production ratio with incident particle energy. Furthermore, information on the purity of (236g)Np so produced is similarly sparse. Accordingly, the existing data is assessed and a plan for future work is presented.
Collapse
Affiliation(s)
- S M Jerome
- National Physical Laboratory, Teddington TW11 OLW, United Kingdom.
| | - P Ivanov
- National Physical Laboratory, Teddington TW11 OLW, United Kingdom
| | - C Larijani
- National Physical Laboratory, Teddington TW11 OLW, United Kingdom
| | - D J Parker
- School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - P H Regan
- National Physical Laboratory, Teddington TW11 OLW, United Kingdom; Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| |
Collapse
|
45
|
Ivanov P, Komsa-Penkova R, Konova E, Ivanov V, Gecheva S, Kovacheva K, Simeonova M. C0543: Plasminogen Activator Inhibitor Type 1 Activity: Impaired Fibrinolysis and Early Pregnancy Wastage. Thromb Res 2014. [DOI: 10.1016/s0049-3848(14)50355-6] [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]
|
46
|
Beshkova N, Ivanov P, Ivanova I. Further Evidence for Glutenin Modifications in Winter Wheat (Triticum AestivumL.) Induced by Somaclonal Variation. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.1998.10818988] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
47
|
Drumeva M, Berville A, Ivanov P, Nenova N, Encheva J. Molecular Investigations on the Doubled Haploid Origin of Sunflower Lines (Helianthus AnnuusL.) Developed Through Gamma-Induced Parthenogenesis. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2005.10817226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
48
|
Petakov D, Ivanov P, Nikolova V. Correlations of Oil Content and Fatty Acid Composition in High Oleic Lines and Hybrids of Sunflower (H. Annuus L.). BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.1993.10818724] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
49
|
Cheshmedjiev S, Mladenov R, Belkinova D, Gecheva G, Dimitrova-Dyulgerova I, Ivanov P, Mihov S. Development of Classification System and Biological Reference Conditions for Bulgarian Rivers and Lakes According to the Water Framework Directive. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2010.10817832] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
50
|
Ivanov P, Ivanov P, Gacheva S, Konova E, Komsa-Penkova R. [Implication of PAI-1 4G/5G polymorphism in recurrent implantation failure after IVF]. Akush Ginekol (Sofiia) 2014; 53:25-29. [PMID: 25509642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
During implantation, an accurate balance of coagulation, fibrin deposition and fibrinolysis is mandatory for trophoblastic invasion. Inhibition of fibrinolysis after increased activity of plasminogen activator inhibitors such as PAI-1 could impair properdeep trophoblastic invasion. This study investigated correlation between increased PAI-1 levels due to gene polymorphism (PL) 4G/5G and recurrent implantation failure after IVF procedure. Sixty one women with two or more unsuccessful IVF procedure after good quality embryo transfer and 97 health women with at least one normal delivery were investigated for carrier status for PL 4G/5G (genotype 4G/4G) and serum levels of anti-cardiolipin (ACA) and anti-beta2-glycoprotein antibody level (IgG and IgM type). The prevalence of genotype 4G/4G in women with RIF was about two times higher compared to controls although the difference did not rich significance (respectively 41% and 26.8%, OR 1.9, 95%CI 0.91-3.96, p=0.09). The prevalence of polymorphism was similar after exclusion of for women with elevated levels of ACA (respectively 42.1% and 26.8%, OR 1.99, 95%CI 0.94-4.21, p=0.075). PL 4G/5G could be possible risk factor forimpaired embryo implantation. The causative hypofibrinolysis due to increased PAI-1 levels should be interpreted in context of multifactor complexity of recurrent implantation failure development. A discussion remains for fraction heparin application and endometrial receptivity modulation in very early pregnancy wastage.
Collapse
|