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Nawar MF, Türler A. New strategies for a sustainable 99mTc supply to meet increasing medical demands: Promising solutions for current problems. Front Chem 2022; 10:926258. [PMID: 35936080 PMCID: PMC9355089 DOI: 10.3389/fchem.2022.926258] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 06/27/2022] [Indexed: 11/13/2022] Open
Abstract
The continuing rapid expansion of 99mTc diagnostic agents always calls for scaling up 99mTc production to cover increasing clinical demand. Nevertheless, 99mTc availability depends mainly on the fission-produced 99Mo supply. This supply is seriously influenced during renewed emergency periods, such as the past 99Mo production crisis or the current COVID-19 pandemic. Consequently, these interruptions have promoted the need for 99mTc production through alternative strategies capable of providing clinical-grade 99mTc with high purity. In the light of this context, this review illustrates diverse production routes that either have commercially been used or new strategies that offer potential solutions to promote a rapid production growth of 99mTc. These techniques have been selected, highlighted, and evaluated to imply their impact on developing 99mTc production. Furthermore, their advantages and limitations, current situation, and long-term perspective were also discussed. It appears that, on the one hand, careful attention needs to be devoted to enhancing the 99Mo economy. It can be achieved by utilizing 98Mo neutron activation in commercial nuclear power reactors and using accelerator-based 99Mo production, especially the photonuclear transmutation strategy. On the other hand, more research efforts should be devoted to widening the utility of 99Mo/99mTc generators, which incorporate nanomaterial-based sorbents and promote their development, validation, and full automization in the near future. These strategies are expected to play a vital role in providing sufficient clinical-grade 99mTc, resulting in a reasonable cost per patient dose.
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Andric M, Kalff JC, Schwenk W, Farkas S, Hartwig W, Türler A, Croner R. [Recommendations on treatment of acute appendicitis : Recommendations of an expert group based on the current literature]. Chirurg 2020; 91:700-711. [PMID: 32747976 DOI: 10.1007/s00104-020-01237-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The paradigm shift in the treatment concept for acute appendicitis is currently the subject of intensive discussions. The diagnosis and differentiation of an uncomplicated from a complicated appendicitis as well as the selection of an adequate treatment is very challenging, especially since nonoperative treatment models have been published. The laparoscopic appendectomy is still the standard for most cases. Guidelines for the treatment of acute appendicitis do not exist in Germany. Therefore, a group of experts elaborated 21 recommendations on the treatment of acute appendicitis after 3 meetings. After initial definition of population, intervention, comparison and outcome (PICO) questions, recommendations have been finalized through the Delphi voting system. The results were evaluated according to the current literature. The aim of this initiative was to define a basic support for decision making in the clinical routine for treatment of acute appendicitis.
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Affiliation(s)
- M Andric
- Klinik für Allgemein‑, Viszeral‑, Gefäß- und Transplantationschirurgie, Universitätsklinikum Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Deutschland.
| | - J C Kalff
- Klinik und Poliklinik für Allgemein‑, Viszeral‑, Thorax- und Gefäßchirurgie, Universitätsklinikum Bonn, Bonn, Deutschland
| | - W Schwenk
- Allgemein‑, Viszeral- und Gefäßchirurgie, Städtisches Klinikum Solingen, Solingen, Deutschland
| | - S Farkas
- Allgemein- und Viszeralchirurgie, St. Josefs-Hospital Wiesbaden, Wiesbaden, Deutschland
| | - W Hartwig
- Klinik für Allgemein‑, Viszeral- und Onkologische Chirurgie, Evangelisches Krankenhaus Düsseldorf, Düsseldorf, Deutschland
| | - A Türler
- Allgemein- und Viszeralchirurgie, Johanniter Kliniken Bonn, Bonn, Deutschland
| | - R Croner
- Klinik für Allgemein‑, Viszeral‑, Gefäß- und Transplantationschirurgie, Universitätsklinikum Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Deutschland
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Panhofer P, Rothe S, Beckerhinn P, Hoffer F, Klaus A, Tentschert G, Chiappetta S, Weiner R, Bueter M, Langer F, Krebs M, Denecke C, Grote B, Türler A, Jacobi C, Jacobi K, Zehetner J, Steffen R, Melmer A, Laimer M, Kröll D, Nett P, Obermayer B. BARBQTCM: BARiatric Basic Questionnaire for TCM - Interest in Complementary Medicine of 2331 Overweight Patients from Germany, Switzerland and Austria. J Acupunct Meridian Stud 2018. [DOI: 10.1016/j.jams.2018.08.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Bottoni S, Cieplicka-Oryńczak N, Bocchi G, Leoni S, Fornal B, Colò G, Bortignon P, Benzoni G, Blanc A, Bracco A, Crespi F, Jentschel M, Köster U, Michelagnoli C, Million B, Mutti P, Soldner T, Türler A, Ur C, Urban W. (n,γ) reactions on rare Ca isotopes: Valence-hole - core excitation couplings in 47Ca. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201819305001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Recent results on the structure of 47Ca will be presented. The nucleus of interest was populated via the cold-neutron capture 46Ca(n,γ) reaction, on a rare 46Ca target, during the EXILL experimental campaign at the nuclear reactor of Institut Laue- Langevin in Grenoble. High-resolution γ-ray spectroscopy, performed with a composite array of HPGe detectors, enabled the identification of new transitions deexciting states between the neutron-capture level and the ground state. Experimental data will be compared with a novel microscopic theoretical model, currently under development, specifically designed to describe the low-lying structure of odd-mass nuclei with one valence particle/hole outside a spherical doubly-magic core, using the Skyrme effective interaction self-consistently.
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Eichler R, Asai M, Brand H, Chiera N, Di Nitto A, Dressler R, Düllmann C, Even J, Fangli F, Goetz M, Haba H, Hartmann W, Jäger E, Kaji D, Kanaya J, Kaneya Y, Khuyagbaatar J, Kindler B, Komori Y, Kraus B, Kratz J, Krier J, Kudou Y, Kurz N, Miyashita S, Morimoto K, Morita K, Murakami M, Nagame Y, Ooe K, Piguet D, Sato N, Sato T, Steiner J, Steinegger P, Sumita T, Takeyama M, Tanaka K, Tomitsuka T, Toyoshima A, Tsukada K, Türler A, Usoltsev I, Wakabayashi Y, Wang Y, Wiehl N, Wittwer Y, Yakushev A, Yamaki S, Yano S, Yamaki S, Qin Z. Complex chemistry with complex compounds. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201613107005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Eichhorn L, Murday AK, Kohnen B, Guttenthaler V, Türler A, Baumgarten G, Wittmann M. [Patient Satisfaction as a Measure of Quality of Patient Care - Comparison between a University Hospital and a General Hospital]. Gesundheitswesen 2015; 79:627-632. [PMID: 26671645 DOI: 10.1055/s-0041-110528] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Objective: The aim of the study was to compare the satisfaction of patients of a general hospital with a university hospital. A patient satisfaction index was calculated based on the assessed levels of satisfaction. In general, higher satisfaction could lead to increased competitiveness and improved cost efficiency for achieving profitability. Methods: The authors developed and administered a questionnaire on distinct parameters presumed to reflect the quality of the hospital stay to patients of a university hospital (University Hospital of Bonn, UKB, 1 224 beds) and a general hospital (Johanniterkrankenhaus, Bonn, JKH, 364 beds). Data were collected anonymously. Patient satisfaction and the relative importance of each parameter were assessed. The quotient of both parameters yields the patient satisfaction index (PZI). In order to account for possible differences in patient demands, statistical analysis was performed. Results: The demands and wishes, satisfaction and importance of the retrieved parameters did not differ significantly between the patients of the hospitals in any of aspects assessed (information, participation, contact and comfort during the hospital-stay). The study showed that communication and the contact to physicians and nurses was significantly more important for the patients than comfort (each p<0.001). The highest PZI were found in the categories entertainment (UKB 1.02; JKH 1.25) and contact to the nursing personnel (PZI UKB 0.94; PZI JKH 0.96). The standard of medical-technical care (UKB 0.93; JKH 0.95) was also highly ranked by patients of both hospitals. Needs for improvement related especially to the communication of errors (UKB 0.33; JKH 0.31). Discussion: Surveillance of patient wishes and criticism may result in a more patient-oriented care on a daily basis. Scrutinizing the resources employed may lead to more efficient use of resources and personnel and thus help cut costs and improve the attractiveness of hospitals.
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Affiliation(s)
- L Eichhorn
- Anästhesiologie, Universitätsklinikum Bonn
| | - A-K Murday
- Anästhesiologie, Universitätsklinikum Bonn
| | - B Kohnen
- Anästhesiologie, Universitätsklinikum Bonn
| | | | - A Türler
- Chirurgie, Johanniter Krankenhaus Bonn
| | | | - M Wittmann
- Anästhesiologie, Universitätsklinikum Bonn
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Eliseev S, Blaum K, Block M, Chenmarev S, Dorrer H, Düllmann CE, Enss C, Filianin PE, Gastaldo L, Goncharov M, Köster U, Lautenschläger F, Novikov YN, Rischka A, Schüssler RX, Schweikhard L, Türler A. Direct Measurement of the Mass Difference of (163)Ho and (163)Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination. Phys Rev Lett 2015; 115:062501. [PMID: 26296112 DOI: 10.1103/physrevlett.115.062501] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Indexed: 06/04/2023]
Abstract
The atomic mass difference of (163)Ho and (163)Dy has been directly measured with the Penning-trap mass spectrometer SHIPTRAP applying the novel phase-imaging ion-cyclotron-resonance technique. Our measurement has solved the long-standing problem of large discrepancies in the Q value of the electron capture in (163)Ho determined by different techniques. Our measured mass difference shifts the current Q value of 2555(16) eV evaluated in the Atomic Mass Evaluation 2012 [G. Audi et al., Chin. Phys. C 36, 1157 (2012)] by more than 7σ to 2833(30(stat))(15(sys)) eV/c(2). With the new mass difference it will be possible, e.g., to reach in the first phase of the ECHo experiment a statistical sensitivity to the neutrino mass below 10 eV, which will reduce its present upper limit by more than an order of magnitude.
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Affiliation(s)
- S Eliseev
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - M Block
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz-Institut Mainz, 55099 Mainz, Germany
- Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany
| | - S Chenmarev
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Physics Faculty of St.Petersburg State University, 198904 Peterhof, Russia
| | - H Dorrer
- Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany
- Paul Scherrer Institute, 5232 Villigen, Switzerland
- Universität Bern, 3012 Bern, Switzerland
| | - Ch E Düllmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz-Institut Mainz, 55099 Mainz, Germany
- Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany
- PRISMA Cluster of Excellence, Johannes Gutenberg-Universität, 55099 Mainz, Germany
| | - C Enss
- Kirchhoff Institut für Physik, Heidelberg Universität, INF 227, 69120 Heidelberg, Germany
| | - P E Filianin
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Physics Faculty of St.Petersburg State University, 198904 Peterhof, Russia
| | - L Gastaldo
- Kirchhoff Institut für Physik, Heidelberg Universität, INF 227, 69120 Heidelberg, Germany
| | - M Goncharov
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - U Köster
- Institut Laue-Langevin, 38042 Grenoble, France
| | - F Lautenschläger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - Yu N Novikov
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Physics Faculty of St.Petersburg State University, 198904 Peterhof, Russia
- Petersburg Nuclear Physics Institute, Gatchina, 188300 St. Petersburg, Russia
| | - A Rischka
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - R X Schüssler
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - L Schweikhard
- Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany
| | - A Türler
- Paul Scherrer Institute, 5232 Villigen, Switzerland
- Universität Bern, 3012 Bern, Switzerland
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Förster S, Reimer T, Rimbach S, Louwen F, Volk T, Bürkle H, Benecke C, Carus T, Türler A, Wullstein C, Ludwig K. [CAMIC Recommendations for Surgical Laparoscopy in Non-Obstetric Indications during Pregnancy]. Zentralbl Chir 2015. [PMID: 26205984 DOI: 10.1055/s-0035-1545904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
In the operative surgical primary care, the laparoscopic surgical technique has firmly established itself in recent years. Meanwhile, in the normal population over 90 % of all cholecystectomies and over 80 % of all appendectomies are performed in a minimally invasive manner. The proven benefits of the laparoscopic surgical technique, compared with conventional open surgery, are a comparatively rapid early postoperative recovery with early resumption of the general physical and occupational activity. As these benefits are equally applicable for necessary interventions during pregnancy, in recent years laparoscopy has become the preferred treatment for non-obstetric indications in the gravid patient. Overall, it can be assumed that such interventions have to be performed in approximately 2 % of all pregnant patients. Numerous studies have proven here that the use of laparoscopic techniques, in particular for the expectant mother, is safe and not associated with an increased risk. On the other hand, the current pregnancy makes necessary an adapted approach to the solution of surgical problems to ensure the protection of the unborn child. On the basis of currently available data situation, recommendations are formulated which can be used as a decision-making support for a variety of clinical situations.
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Affiliation(s)
- S Förster
- Klinik für Allgemein-, Viszeral-, Thorax- und Gefäßchirurgie, Klinikum Südstadt, Rostock, Deutschland
| | - T Reimer
- Universitätsfrauenklinik und Poliklinik am Klinikum Südstadt, Rostock
| | - S Rimbach
- Landeskrankenhaus Feldkirch, Gynäkologie und Geburtshilfe, Feldkirch, Österreich
| | - F Louwen
- Klinik für Frauenheilkunde und Geburtsmedizin, Universitätsklinikum Frankfurt am Main
| | - T Volk
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Universitätsklinikum des Saarlandes, Homburg, Saar
| | - H Bürkle
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Freiburg
| | - C Benecke
- Klinik für Chirurgie, Universitätsklinikum Schleswig-Holstein, Campus Lübeck
| | - T Carus
- Klinik für Allgemin-, Viszeral- und Unfallchirurgie, Klinikum Bremen Ost
| | - A Türler
- Klinik für Allgemein- und Viszeralchirurgie, Johanniter-Klinikum Bonn
| | - C Wullstein
- Klinik für Allgemein-, Viszeral- und Minimalinvasive Chirurgie, Helios Klinikum Krefeld
| | - K Ludwig
- Klinik für Allgemein-, Viszeral-, Thorax- und Gefäßchirurgie, Klinikum Südstadt, Rostock, Deutschland
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Even J, Yakushev A, Düllmann CE, Haba H, Asai M, Sato TK, Brand H, Di Nitto A, Eichler R, Fan FL, Hartmann W, Huang M, Jäger E, Kaji D, Kanaya J, Kaneya Y, Khuyagbaatar J, Kindler B, Kratz JV, Krier J, Kudou Y, Kurz N, Lommel B, Miyashita S, Morimoto K, Morita K, Murakami M, Nagame Y, Nitsche H, Ooe K, Qin Z, Schädel M, Steiner J, Sumita T, Takeyama M, Tanaka K, Toyoshima A, Tsukada K, Türler A, Usoltsev I, Wakabayashi Y, Wang Y, Wiehl N, Yamaki S. Nuclear chemistry. Synthesis and detection of a seaborgium carbonyl complex. Science 2014; 345:1491-3. [PMID: 25237098 DOI: 10.1126/science.1255720] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Experimental investigations of transactinoide elements provide benchmark results for chemical theory and probe the predictive power of trends in the periodic table. So far, in gas-phase chemical reactions, simple inorganic compounds with the transactinoide in its highest oxidation state have been synthesized. Single-atom production rates, short half-lives, and harsh experimental conditions limited the number of experimentally accessible compounds. We applied a gas-phase carbonylation technique previously tested on short-lived molybdenum (Mo) and tungsten (W) isotopes to the preparation of a carbonyl complex of seaborgium, the 106th element. The volatile seaborgium complex showed the same volatility and reactivity with a silicon dioxide surface as those of the hexacarbonyl complexes of the lighter homologs Mo and W. Comparison of the product's adsorption enthalpy with theoretical predictions and data for the lighter congeners supported a Sg(CO)6 formulation.
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Affiliation(s)
- J Even
- Helmholtz-Institut Mainz, 55099 Mainz, Germany
| | - A Yakushev
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Ch E Düllmann
- Helmholtz-Institut Mainz, 55099 Mainz, Germany. GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany. Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
| | - H Haba
- RIKEN, Wako, Saitama 351-0198, Japan
| | - M Asai
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - T K Sato
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - H Brand
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - A Di Nitto
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - R Eichler
- Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland. Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - F L Fan
- Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, China
| | - W Hartmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - M Huang
- RIKEN, Wako, Saitama 351-0198, Japan
| | - E Jäger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - D Kaji
- RIKEN, Wako, Saitama 351-0198, Japan
| | - J Kanaya
- RIKEN, Wako, Saitama 351-0198, Japan
| | - Y Kaneya
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | | | - B Kindler
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - J V Kratz
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - J Krier
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Y Kudou
- RIKEN, Wako, Saitama 351-0198, Japan
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - B Lommel
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - S Miyashita
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan. Department of Chemistry, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | | | - K Morita
- RIKEN, Wako, Saitama 351-0198, Japan. Department of Physics, Kyushu University, Higashi-Ku, Fukuoka, 812-8581, Japan
| | - M Murakami
- RIKEN, Wako, Saitama 351-0198, Japan. Department of Chemistry, Niigata University, Niigata, Niigata 950-2181, Japan
| | - Y Nagame
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - H Nitsche
- Department of Chemistry, University of California, Berkeley, CA 94720-1460, USA. Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8169, USA
| | - K Ooe
- Department of Chemistry, Niigata University, Niigata, Niigata 950-2181, Japan
| | - Z Qin
- Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, China
| | - M Schädel
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - J Steiner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - T Sumita
- RIKEN, Wako, Saitama 351-0198, Japan
| | | | - K Tanaka
- RIKEN, Wako, Saitama 351-0198, Japan
| | - A Toyoshima
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - K Tsukada
- Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - A Türler
- Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland. Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - I Usoltsev
- Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland. Paul Scherrer Institute, 5232 Villigen, Switzerland
| | | | - Y Wang
- Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, China
| | - N Wiehl
- Helmholtz-Institut Mainz, 55099 Mainz, Germany. Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - S Yamaki
- RIKEN, Wako, Saitama 351-0198, Japan. Department of Physics, Saitama University, Saitama 338-8570, Japan
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Pershina V, Borschevsky A, Iliaš M, Türler A. Theoretical predictions of properties and volatility of chlorides and oxychlorides of group-4 elements. II. Adsorption of tetrachlorides and oxydichlorides of Zr, Hf, and Rf on neutral and modified surfaces. J Chem Phys 2014; 141:064315. [PMID: 25134579 DOI: 10.1063/1.4891531] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
With the aim to interpret results of gas-phase chromatography experiments on volatility of group-4 tetrachlorides and oxychlorides including those of Rf, adsorption enthalpies of these species on neutral, and modified quartz surfaces were estimated on the basis of relativistic, two-component Density Functional Theory calculations of MCl4, MOCl2, MCl6(-), and MOCl4(2) with the use of adsorption models. Several mechanisms of adsorption were considered. In the case of physisorption of MCl4, the trend in the adsorption energy in the group should be Zr > Hf > Rf, so that the volatility should change in the opposite direction. The latter trend complies with the one in the sublimation enthalpies, ΔH(sub), of the Zr and Hf tetrachlorides, i.e., Zr < Hf. On the basis of a correlation between these quantities, ΔH(sub)(RfCl4) was predicted as 104.2 kJ/mol. The energy of physisorption of MOCl2 on quartz should increase in the group, Zr < Hf < Rf, as defined by increasing dipole moments of these molecules along the series. In the case of adsorption of MCl4 on quartz by chemical forces, formation of the MOCl2 or MOCl4(2-) complexes on the surface can take place, so that the sequence in the adsorption energy should be Zr > Hf > Rf, as defined by the complex formation energies. In the case of adsorption of MCl4 on a chlorinated quartz surface, formation of the MCl6(2-) surface complexes can occur, so that the trend in the adsorption strength should be Zr ≤ Hf < Rf. All the predicted sequences, showing a smooth change of the adsorption energy in the group, are in disagreement with the reversed trend Zr ≈ Rf < Hf, observed in the "one-atom-at-a-time" gas-phase chromatography experiments. Thus, currently no theoretical explanation can be found for the experimental observations.
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Affiliation(s)
- V Pershina
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, Darmstadt D-64291, Germany
| | - A Borschevsky
- Helmholtz Institute Mainz, Mainz D-55128, Germany and Centre for Theoretical Chemistry and Physics, New Zealand Institute for Advanced Study, Massey University, Private Bag 102904, 0745 North Shore MSC, Auckland, New Zealand
| | - M Iliaš
- Department of Chemistry, Faculty of Natural Sciences, Matej Bel University, Tajovského 40, SK-974 00 Banská Bystrica, Slovakia
| | - A Türler
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland and Laboratory for Radiochemistry and Environmental Chemistry, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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Bunka M, Müller C, Domnanich K, Schibli R, Türler A, van der Meulen N. 44Sc production development from 44Ca for radiopharmaceutical application. Nucl Med Biol 2014. [DOI: 10.1016/j.nucmedbio.2014.05.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Khuyagbaatar J, Yakushev A, Düllmann CE, Ackermann D, Andersson LL, Asai M, Block M, Boll RA, Brand H, Cox DM, Dasgupta M, Derkx X, Di Nitto A, Eberhardt K, Even J, Evers M, Fahlander C, Forsberg U, Gates JM, Gharibyan N, Golubev P, Gregorich KE, Hamilton JH, Hartmann W, Herzberg RD, Heßberger FP, Hinde DJ, Hoffmann J, Hollinger R, Hübner A, Jäger E, Kindler B, Kratz JV, Krier J, Kurz N, Laatiaoui M, Lahiri S, Lang R, Lommel B, Maiti M, Miernik K, Minami S, Mistry A, Mokry C, Nitsche H, Omtvedt JP, Pang GK, Papadakis P, Renisch D, Roberto J, Rudolph D, Runke J, Rykaczewski KP, Sarmiento LG, Schädel M, Schausten B, Semchenkov A, Shaughnessy DA, Steinegger P, Steiner J, Tereshatov EE, Thörle-Pospiech P, Tinschert K, Torres De Heidenreich T, Trautmann N, Türler A, Uusitalo J, Ward DE, Wegrzecki M, Wiehl N, Van Cleve SM, Yakusheva V. 48Ca+249Bk fusion reaction leading to element Z = 117: long-lived α-decaying 270Db and discovery of 266Lr. Phys Rev Lett 2014; 112:172501. [PMID: 24836239 DOI: 10.1103/physrevlett.112.172501] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Indexed: 06/03/2023]
Abstract
The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown α-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope (266)Lr (Z = 103). The identification of the long-lived (T(1/2) = 1.0(-0.4)(+1.9) h) α-emitter (270)Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability."
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Affiliation(s)
- J Khuyagbaatar
- Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - A Yakushev
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - Ch E Düllmann
- Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - D Ackermann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | | | - M Asai
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - M Block
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R A Boll
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H Brand
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - D M Cox
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - M Dasgupta
- The Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - X Derkx
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - A Di Nitto
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - K Eberhardt
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - J Even
- Helmholtz Institute Mainz, 55099 Mainz, Germany
| | - M Evers
- The Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | | | | | - J M Gates
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - N Gharibyan
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | | | - K E Gregorich
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J H Hamilton
- Vanderbilt University, Nashville, Tennessee 37235, USA
| | - W Hartmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R-D Herzberg
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - F P Heßberger
- Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - D J Hinde
- The Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - J Hoffmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R Hollinger
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - A Hübner
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - E Jäger
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - B Kindler
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - J V Kratz
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - J Krier
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - M Laatiaoui
- Helmholtz Institute Mainz, 55099 Mainz, Germany
| | - S Lahiri
- Saha Institute of Nuclear Physics, Kolkata 700064, India
| | - R Lang
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - B Lommel
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - M Maiti
- Saha Institute of Nuclear Physics, Kolkata 700064, India
| | - K Miernik
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S Minami
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - A Mistry
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - C Mokry
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - H Nitsche
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | | | - G K Pang
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - P Papadakis
- University of Liverpool, Liverpool L69 7ZE, United Kingdom and University of Jyväskylä, 40351 Jyväskylä, Finland
| | - D Renisch
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - J Roberto
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | | | - J Runke
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - K P Rykaczewski
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | | | - M Schädel
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - B Schausten
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | | | - D A Shaughnessy
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - P Steinegger
- Paul Scherrer Institute, 5232 Villigen, Switzerland and University of Bern, 3012 Bern, Switzerland
| | - J Steiner
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - E E Tereshatov
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - P Thörle-Pospiech
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - K Tinschert
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | | | - N Trautmann
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - A Türler
- Paul Scherrer Institute, 5232 Villigen, Switzerland and University of Bern, 3012 Bern, Switzerland
| | - J Uusitalo
- University of Jyväskylä, 40351 Jyväskylä, Finland
| | - D E Ward
- Lund University, 22100 Lund, Sweden
| | - M Wegrzecki
- Institute of Electron Technology, 02-668 Warsaw, Poland
| | - N Wiehl
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - S M Van Cleve
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - V Yakusheva
- Helmholtz Institute Mainz, 55099 Mainz, Germany
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14
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Forsberg U, Rudolph D, Golubev P, Sarmiento L, Yakushev A, Andersson LL, Nitto AD, Düllmann C, Gates J, Gregorich K, Gross C, Heßberger F, Herzberg RD, Khuyagbaatar J, Kratz J, Rykaczewski K, Schädel M, Åberg S, Ackermann D, Block M, Brand H, Carlsson B, Cox D, Derkx X, Eberhardt K, Even J, Fahlander C, Gerl J, Jäger E, Kindler B, Krier J, Kojouharov I, Kurz N, Lommel B, Mistry A, Mokry C, Nitsche H, Omtvedt J, Papadakis P, Ragnarsson I, Runke J, Schaffner H, Schausten B, Thörle-Pospiech P, Torres T, Traut T, Trautmann N, Türler A, Ward A, Ward D, Wiehl AN. Spectroscopic Tools Applied to Element Z = 115 Decay Chains. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146602036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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15
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Nishio K, Ikezoe H, Hofmann S, Heßberger F, Ackermann D, Antalic S, Aritomo Y, Comas V, Düllman C, Gorshkov A, Graeger R, Heinz S, Heredia J, Hirose K, Khuyagbaatar J, Kindler B, Kojouharov I, Lommel B, Makii H, Mann R, Mitsuoka S, Nagame Y, Nishinaka I, Ohtsuki T, Popeko A, Saro S, Schädel M, Türler A, Wakabayashi Y, Watanabe Y, Yakushev A, Yeremin A. Study of heavy-ion induced fission for heavy-element synthesis. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146603065] [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: 11/14/2022] Open
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16
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Gärtner M, Boettger Μ, Eichler Β, Gäggeler ΗW, Grantz Μ, Hübener S, Jost DT, Piguet D, Dressler R, Türler A, Yakushev ΑB. On-line Gas Chromatography of Mo, W and U (Oxy)chlorides. RADIOCHIM ACTA 2013. [DOI: 10.1524/ract.1997.78.special-issue.59] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- M. Gärtner
- Labor für Radio- und Umweltchemie, Universität Bern, 3000 Bern, Switzerland
| | - Μ. Boettger
- Institut für Radiochemie, Forschungszentrum Rossendorf, D-01314 Dresden, Germany
| | - Β. Eichler
- Labor für Radio- und Umweltchemie, Paul-Scherrer-Institut, 5232 Villigen, Switzerland
| | - Η. W. Gäggeler
- Labor für Radio- und Umweltchemie, Universität Bern, 3000 Bern, Switzerland
- Labor für Radio- und Umweltchemie, Paul-Scherrer-Institut, 5232 Villigen, Switzerland
| | - Μ. Grantz
- Institut für Radiochemie, Forschungszentrum Rossendorf, D-01314 Dresden, Germany
| | - S. Hübener
- Institut für Radiochemie, Forschungszentrum Rossendorf, D-01314 Dresden, Germany
| | - D. T. Jost
- Labor für Radio- und Umweltchemie, Paul-Scherrer-Institut, 5232 Villigen, Switzerland
| | - D. Piguet
- Labor für Radio- und Umweltchemie, Paul-Scherrer-Institut, 5232 Villigen, Switzerland
| | - R. Dressler
- Flerov Laboratory for Nuclear Reactions, Dubna, 141980 Russia
| | - A. Türler
- Labor für Radio- und Umweltchemie, Paul-Scherrer-Institut, 5232 Villigen, Switzerland
| | - Α. B. Yakushev
- Flerov Laboratory for Nuclear Reactions, Dubna, 141980 Russia
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17
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Heinitz S, Schumann D, Neuhausen J, Köchli S, Thomsen K, Platacis E, Lielausis O, Bucenieks I, Zik A, Romančuks A, Kravalis K, Buligins L, Türler A. A comparison between the chemical behaviour of lead-gold and lead-bismuth eutectics towards 316L stainless steel. RADIOCHIM ACTA 2013. [DOI: 10.1524/ract.2013.2063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
Lead-gold eutectic (LGE) has been recently proposed as an alternative target material for high power spallation sources. In order to compare the corrosive properties of LGE to the better-studied eutectic of lead-bismuth (LBE), an isothermal twin-loop made of SS 316L was built and operated at the Institute of Physics of the University of Latvia. We have measured the concentration of steel alloying elements dissolved in both alloys at the end of two test campaigns via ICP-OES. In case of LGE, a pronounced concentration increase of Fe, Ni, Mn and Cr is found in the liquid metal, which is significantly higher compared to LBE. Similar results were obtained during complementary investigations on material samples exposed to both alloys in this twin-loop at 400 ◦C and 450 ◦C. These findings indicate that in contact with LGE, SS 316L steel suffers from substantial chemical attack. Detailed investigations using structure materials other than SS 316L have to be undertaken before qualifying LGE as a serious alternative to LBE.
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Affiliation(s)
- S. Heinitz
- Paul Scherrer Institute, Laboratory of Radiochemistry and Environmental Chemistry, 5232 Villigen, PSI, Switzerland
- University of Bern, Department of Chemistry and Biochemistry, 3012, Bern, Switzerland
| | - D. Schumann
- Paul Scherrer Institute, Laboratory of Radiochemistry and Environmental Chemistry, 5232 Villigen, PSI, Switzerland
| | - J. Neuhausen
- Paul Scherrer Institute, Laboratory of Radiochemistry and Environmental Chemistry, 5232 Villigen, PSI, Switzerland
| | - S. Köchli
- Paul Scherrer Institute, Laboratory of Radiochemistry and Environmental Chemistry, 5232 Villigen, PSI, Switzerland
| | - K. Thomsen
- Paul Scherrer Institute, Spallation Neutron Source Division, 5232 Villigen, PSI, Switzerland
| | - E. Platacis
- Institute of Physics, University of Latvia, 2169 IPUL, Latvia
| | - O. Lielausis
- Institute of Physics, University of Latvia, 2169 IPUL, Latvia
| | - I. Bucenieks
- Institute of Physics, University of Latvia, 2169 IPUL, Latvia
| | - A. Zik
- Institute of Physics, University of Latvia, 2169 IPUL, Latvia
| | - A. Romančuks
- Institute of Physics, University of Latvia, 2169 IPUL, Latvia
| | - K. Kravalis
- Institute of Physics, University of Latvia, 2169 IPUL, Latvia
| | - L. Buligins
- Faculty of Physics and Mathematics, University of Latvia, 1002 Riga, Latvia
| | - A. Türler
- Paul Scherrer Institute, Laboratory of Radiochemistry and Environmental Chemistry, 5232 Villigen, PSI, Switzerl
- University of Bern, Department of Chemistry and Biochemistry, 3012, Bern, Switzerland
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18
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Rudolph D, Forsberg U, Golubev P, Sarmiento LG, Yakushev A, Andersson LL, Di Nitto A, Düllmann CE, Gates JM, Gregorich KE, Gross CJ, Heßberger FP, Herzberg RD, Khuyagbaatar J, Kratz JV, Rykaczewski K, Schädel M, Åberg S, Ackermann D, Block M, Brand H, Carlsson BG, Cox D, Derkx X, Eberhardt K, Even J, Fahlander C, Gerl J, Jäger E, Kindler B, Krier J, Kojouharov I, Kurz N, Lommel B, Mistry A, Mokry C, Nitsche H, Omtvedt JP, Papadakis P, Ragnarsson I, Runke J, Schaffner H, Schausten B, Thörle-Pospiech P, Torres T, Traut T, Trautmann N, Türler A, Ward A, Ward DE, Wiehl N. Spectroscopy of element 115 decay chains. Phys Rev Lett 2013; 111:112502. [PMID: 24074079 DOI: 10.1103/physrevlett.111.112502] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Indexed: 06/02/2023]
Abstract
A high-resolution α, x-ray, and γ-ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum für Schwerionenforschung. Thirty correlated α-decay chains were detected following the fusion-evaporation reaction 48Ca + 243Am. The observations are consistent with previous assignments of similar decay chains to originate from element Z=115. For the first time, precise spectroscopy allows the derivation of excitation schemes of isotopes along the decay chains starting with elements Z>112. Comprehensive Monte Carlo simulations accompany the data analysis. Nuclear structure models provide a first level interpretation.
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Zhernosekov K, Geistlich S, Blanc A, Landolt S, Türler A, Schibli R. 270 177LU QUALITY ANALYSIS FOR AN EFFICIENT PREPARATION OF 177LU-LABELED COMPOUNDS. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70235-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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21
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Nishio K, Ikezoe H, Hofmann S, Ackermann D, Antalic S, Aritomo Y, Comas V, Düllmann C, Gorshkov A, Graeger R, Hagino K, Heinz S, Heredia J, Hirose K, Khuyagbaatar J, Kindler B, Kojouharov I, Lommel B, Makii H, Mann R, Mitsuoka S, Nagame Y, Nishinaka I, Ohtsuki T, Popeko A, Saro S, Schädel M, Türler A, Wakabayashi Y, Watanabe Y, Yakushev A, Yeremin A. Investigation of fission properties and evaporation residue measurement in the reactions using238U target nucleus. EPJ Web of Conferences 2011. [DOI: 10.1051/epjconf/20111709005] [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: 11/14/2022] Open
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22
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Abstract
Abstract
Fast on-line gas chemical separations of Hs (hassium, element 108) in the form of HsO4 were applied to investigate the reactions 26Mg + 248Cm and 36S + 238U. In an experiment at the gas-filled separator DGFRS the reaction 48Ca + 226Ra was studied. In all cases the product of complete nuclear fusion is 274Hs*. For the first time, the new nuclide 270Hs was produced in the 4n evaporation channel and its decay properties investigated. The nuclide 270Hs was predicted by microscopic-macroscopic calculations to be a deformed doubly magic nucleus and its decay properties are therefore of special interest to theory. Also, much more detailed information was gained on the decay of 269Hs and its daughters, which led to a new assignment of decay properties of the daughter nuclides 265Sg and 261Rf. There is evidence fo r isomeric states in 265Sg and 261Rf, while 266Sg is not an alpha-particle emitter as believed previously, but decays by spontaneous fission (SF) with a rather short half-life. Also, interesting features of the used reaction 26Mg + 248Cm led to the discovery of the nucleus 271Hs in the same experiments. An investigation of the influence of the Q-value on the fusion reaction in relation to the location of the fusion barrier showed, that the high binding energy of 48Ca largely compensates for the lower fusion probability compared to more asymmetric reactions, while 36S is not as promising as a projectile.
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23
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Serov A, Aksenov NV, Bozhikov GA, Eichler R, Dressler R, Lebedev VY, Petrushkin O, Piguet D, Shishkin S, Tereshatov E, Türler A, et al.. Adsorption interaction of astatine species with quartz and gold surfaces. RADIOCHIM ACTA 2011. [DOI: 10.1524/ract.2011.1850] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The adsorption interaction of various astatine species with quartz and gold surfaces was investigated by gas chromatography methods. Due to variations of the redox potential of the carrier gas elemental astatine, astatine oxide and hypo-astatic acid have been produced. The identification of the astatine compounds is based on the analogy assumption to the gas phase chemistry of the closest homologues in group 17 of the periodic table, iodine and bromine. The deposition temperatures as well as enthalpies of adsorption have been determined for the astatine species. The enhancement of the metallic character within group 17 towards higher Z is clearly confirmed. Macroscopic properties (sublimation enthalpy) of previously unstudied AtO2 and HAtO were estimated. The determined data for elemental astatine were compared to available literature data. Based on the obtained experimental results possible designs of experiments for studying of chemical properties of the recently discovered element 117 can be suggested.
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Affiliation(s)
- A. Serov
- Paul Scherrer Institute, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | - N. V. Aksenov
- Joint Institute for Nuclear Research, Flerov Laboratory of Nuclear Reactions, Dubna, Russische Föderation
| | - G. A. Bozhikov
- Joint Institute for Nuclear Research, Flerov Laboratory of Nuclear Reactions, Dubna, Russische Föderation
| | | | - R. Dressler
- Paul Scherrer Institut, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | - V. Ya. Lebedev
- Joint Institute for Nuclear Research, Flerov Laboratory of Nuclear Reactions, Dubna, Russische Föderation
| | - O. Petrushkin
- Joint Institute for Nuclear Research, Flerov Laboratory of Nuclear Reactions, Dubna, Russische Föderation
| | - D. Piguet
- Paul Scherrer Institut, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | - S. Shishkin
- Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Russische Föderation
| | - E. Tereshatov
- Joint Institute for Nuclear Research, Flerov Laboratory of Nuclear Reactions, Dubna, Russische Föderation
| | - A. Türler
- Paul Scherrer Institute, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
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24
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Overhaus M, Schaudienst CB, Nohl Y, Vilz TO, Hirner A, Standop J, Türler A, Kalff JC, Schäfer N. [Cost-effectiveness of hernia repair : IPOM versus open sublay mesh technique]. Chirurg 2011; 82:813-9. [PMID: 21424287 DOI: 10.1007/s00104-011-2076-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In comparison to the conventional technique of incisional or umbilical hernia repair with sublay mesh augmentation, incisional hernias in obese patients can be surgically treated with minor surgical trauma by laparoscopic intraperitoneal onlay mesh (IPOM) repair. However, although shortened operation time, hospital stay and faster postoperative reconvalescence might be possible with IPOM repair, the economic calculation including mesh costs is significantly higher. In this study the two operation techniques were compared and the perioperative advantages and disadvantages of both methods were analyzed based on the German diagnosis-related groups (DRG) system.
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Affiliation(s)
- M Overhaus
- Klinik und Poliklinik für Allgemein-, Viszeral-, Thorax- und Gefässchirurgie, Universitätsklinik Bonn, Deutschland.
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25
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Loktionova NS, Belozub AN, Filosofov DV, Zhernosekov KP, Wagner T, Türler A, Rösch F. Improved column-based radiochemical processing of the generator produced 68Ga. Appl Radiat Isot 2011; 69:942-6. [PMID: 21420306 DOI: 10.1016/j.apradiso.2011.02.035] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Accepted: 02/20/2011] [Indexed: 11/29/2022]
Abstract
An improved chemical strategy for processing of the generator produced (68)Ga was developed based on processing of the original (68)Ge/(68)Ga generator eluate on a micro-column. Direct pre-concentration and purification of the eluted (68)Ga is performed on a cation-exchange resin in hydrochloric acid/acetone media. A supplementary step based on a second micro-column filled with a second resin allows direct re-adsorption of (68)Ga eluted from the cation exchanger. (68)Ga is finally striped from the second resin with a small volume of pure water. For this purpose a strong anion exchanger and a novel extraction chromatographic resin based on tetraalkyldiglycolamides are characterized. The strategy allows online pre-concentration and purification of (68)Ga from the original generator eluate. The supplementary column allows transferring (68)Ga with high radionuclide and chemical quality in the aqueous solution with small volume and low acidity useful for direct radiolabeling reactions.
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Affiliation(s)
- N S Loktionova
- Institute of Nuclear Chemistry, Johannes Gutenberg-University of Mainz, Fritz-Strassmann-Weg 2, Mainz, Germany
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Serov A, Eichler R, Dressler R, Piguet D, Türler A, Vögele A, Wittwer D, Gäggeler HW. Gas chromatography of indium in macroscopic and carrier-free amounts using quartz and gold as stationary phases. RADIOCHIM ACTA 2011. [DOI: 10.1524/ract.2011.1797] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The chemical investigation of E113 is likely to become soon feasible. The determination of chemical properties of carrier-free amounts of the lighter homologues of element 113, especially indium and thallium, allows designing experimental set-ups and selecting experimental conditions suitable for performing these studies. Here, we present investigations of the interaction of indium species with quartz and gold surfaces. Deposition temperatures as well as enthalpies of adsorption were determined for indium T
dep=739±20 °C (−ΔH
ads(In)=227±10 kJ mol−1) and for indium hydroxide T
dep=250±20 °C (−ΔH
ads(InOH)= 124±10 kJ mol−1) respectively, on quartz. In case of adsorption of indium on a gold surface only a lower limit of the deposition temperature was established T
dep>980 °C (−ΔH
ads(In)≥315±10 kJ mol−1). Investigations of macroscopic amounts of indium in thermosublimation experiments at similar experimental conditions were instrumental to establish a tentative speciation of the observed indium species.
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Affiliation(s)
- A. Serov
- Paul Scherrer Institute, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | | | - R. Dressler
- Paul Scherrer Institut, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | - D. Piguet
- Paul Scherrer Institut, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | - A. Türler
- Paul Scherrer Institute, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | - A. Vögele
- Paul Scherrer Institute, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | - David Wittwer
- Paul Scherrer Institute, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
| | - H. W. Gäggeler
- Paul Scherrer Institute, Laboratory for Radiochemistry and Environmental Ch, Villigen, Schweiz
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27
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Düllmann CE, Schädel M, Yakushev A, Türler A, Eberhardt K, Kratz JV, Ackermann D, Andersson LL, Block M, Brüchle W, Dvorak J, Essel HG, Ellison PA, Even J, Gates JM, Gorshkov A, Graeger R, Gregorich KE, Hartmann W, Herzberg RD, Hessberger FP, Hild D, Hübner A, Jäger E, Khuyagbaatar J, Kindler B, Krier J, Kurz N, Lahiri S, Liebe D, Lommel B, Maiti M, Nitsche H, Omtvedt JP, Parr E, Rudolph D, Runke J, Schausten B, Schimpf E, Semchenkov A, Steiner J, Thörle-Pospiech P, Uusitalo J, Wegrzecki M, Wiehl N. Production and decay of element 114: high cross sections and the new nucleus 277Hs. Phys Rev Lett 2010; 104:252701. [PMID: 20867370 DOI: 10.1103/physrevlett.104.252701] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Indexed: 05/29/2023]
Abstract
The fusion-evaporation reaction 244Pu(48Ca,3-4n){288,289}114 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the production and decay of {288,289}114. At a compound nucleus excitation energy of E{*}=39.8-43.9 MeV, the 4n evaporation channel cross section was 9.8{-3.1}{+3.9} pb. At E^{*}=36.1-39.5 MeV, that of the 3n evaporation channel was 8.0{-4.5}{+7.4} pb. In one of the 3n evaporation channel decay chains, a previously unobserved α branch in 281Ds was observed (probability to be of random origin from background: 0.1%). This α decay populated the new nucleus 277Hs, which decayed by spontaneous fission after a lifetime of 4.5 ms.
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Affiliation(s)
- Ch E Düllmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
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28
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Kronenberg A, Eberhardt K, Kratz JV, Mohapatra PK, Nähler A, Thörle P, Brüchle W, Schädel M, Türler A. On-line anion exchange of rutherfordium in HF/HNO3 and HF solutions. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.92.7.379.35753] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
The fluoride complexation of the group-4 elements Zr, Hf, and Rf, and of the pseudo-homolog Th, was previously investigated in mixed HNO3/HF solutions by studying K
d values on both cation-exchange resins (CIX) and anion-exchange resins (AIX) using the automated rapid chemistry apparatus ARCA. On the CIX, the fluoride complexation of Rf was found to be weaker than that of Zr and Hf but stronger than that of Th. On the AIX, the competition for the binding sites by the counter ion NO3
- was found to be stronger for the fluoride complexes of Rf than for those of Zr and Hf. The aim of the present work is to add independent evidence to the latter result by measuring K
d values for Rf on the AIX in 0.1 M HNO3/0.5 M HF and in 0.01 M HF without any HNO3. The results are obtained via an activity ratio of the long-lived α-decay descendant of 261mRf, 20-d 253Es, using the multi-column technique (MCT). These experiments corroborate the seemingly much more pronounced competition of NO3
- for the exchanging sites of the AIX with respect to [RfF
x
](
x
-4)- than with [ZrF
x
](
x
-4)- and [HfF
x
](
x
-4)-.
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29
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Soverna S, Dressler R, Düllmann CE, Eichler B, Eichler R, Gäggeler HW, Haenssler F, Niklaus JP, Piguet D, Qin Z, Türler A, Yakushev AB. Thermochromatographic studies of mercury and radon on transition metal surfaces. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.93.1.1.58298] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
In preparation for the experimental investigation of chemical properties of element 112 model studies were conducted based on the assumed similarity of element 112 to either the noble gas Rn or the transition metal Hg, its supposed lighter homologue in group 12. The adsorption behavior of elemental Hg on the transition metals Ag, Au, Ni, Pd, and Pt were investigated experimentally by off-line gas thermochromatography. The deduced adsorption data of Hg were compared with new values calculated using the Eichler–Miedema model. The observed sequence of increasing Hg-metal-interactions for Ag < Ni < Au < Pd < Pt confirms the predicted trend. The only exception was Pd, on which Hg was calculated to adsorb at a higher temperature than on Pt. Difficulties to obtain reproducible clean surfaces of Ag, Ni, Pd, and Pt led to the choice of Au as the best metal surface suitable to adsorb Hg.
For fast on-line gas thermochromatography studies on metallic surfaces a new set-up was developed based on the In-situ Volatilization and On-line detection technique (IVO). This set-up was tested in on-line thermochromatographic investigations with short-lived Hg isotopes and 219Rn, using Au or Pd as stationary surfaces. An overall efficiency of about 60% and a transportation time less than 25 s was determined for this newly designed IVO. A separation factor of more than 106 was estimated for non-volatile species.
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30
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Sylwester E, Gregorich K, Lee D, Kadkhodayan B, Türler A, Adams J, Kacher C, Lane M, Laue C, McGrath C. On-line gas chromatographic studies of Rf, Zr, and Hf bromides. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2000.88.12.837] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The Heavy Element Volatility Instrument (HEVI), an on-line isothermal gas chromatography system, has been used to separate the volatile bromide compounds of the group 4 elements Zr and Hf and the transactinide Rf according to their volatilities, and to provide data on the gas phase chemical properties of very short-lived isotopes in amounts as low as a few atoms. For these studies261Rf was produced via the248Cm(18O, 5n) reaction.165-167Hf was produced via the reactionnatEu(19F, xn), and85Zr was produced via thenatCu(28Si, 3p3n) reaction. The half-life for261Rf was measured to be 75±7 seconds.A Monte Carlo code was used to deduce the enthalpy of adsorption (ΔHa) from the observed volatility and parameters of the chromatography system. The resulting adsorption enthalpies for the Zr, Hf, and Rf tetrabromides are: -108±5 kJ · mol-1, -113±5 kJ · mol-1 and -87±7 kJ · mol-1, respectively.Volatilities of the group 4 bromides support the conclusion from previous results for the group 4 chlorides that Rf deviates from the trend expected by simple extrapolation of the properties of its lighter homologs in the periodic table. The group 4 bromides are also observed to be less volatile than their respective chlorides, as predicted by relativistic calculations.
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Abstract
Abstract
The thermochromatographic behavior of berkelium chlorides in various chlorinating gases was studied. Using Cl2 or a mixture of Cl2/SOCl2, two peaks were observed in a thermochromatographic column. The "high temperature" peak corresponds to BkCl3 and the "low temperature" one corresponds most probably to BkCl4. Using both the model of mobile adsorption and the of Monte Carlo method, the adsorption enthalpies were determined. The possible chemical reactions in a chromatographic column are discussed.
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32
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Kratz JV, Nähler A, Rieth U, Kronenberg A, Kuczewski B, Strub E, Brüchle W, Schädel M, Schausten B, Türler A, Gäggeler HW, Jost DT, Gregorich KE, Nitsche H, Laue C, Sudowe R, Wilk PA. An EC-branch in the decay of 27-s 263Db: Evidence for the isotope 263Rf. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.91.1.59.19010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
27-s 263Db was produced in the 249Bk ( 18O, 4n) reaction at 93 MeV. The activity was transported by a He/KCl-jet to the laboratory where it was collected for 15 min and then subjected to a chemical separation specific for group-4 elements. The activity was dissolved in 0.5 M unbuffered α-HiB and eluted from a cation-exchange column. The effluent was made 9 M in HCl and group-4 tetrachlorides were extracted into TBP/Cyclohexane which was evaporated to dryness on a Ta disc. The Ta discs were assayed for α and SF activity. A SF activity with a half life on the order of 20 min was observed and assigned to the nuclide 263Rf. It is formed by electron-capture decay of 263Db with a decay branch of 3+4
-1%.
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33
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Eichler R, Brüchle W, Buda R, Bürger S, Dressler R, Düllmann CE, Dvorak J, Eberhardt K, Eichler B, Folden CM, Gäggeler HW, Gregorich KE, Haenssler F, Hoffman DC, Hummrich H, Jäger E, Kratz JV, Kuczewski B, Liebe D, Nayak D, Nitsche H, Piguet D, Qin Z, Rieth U, Schädel M, Schausten B, Schimpf E, Semchenkov A, Soverna S, Sudowe R, Trautmann N, Thörle P, Türler A, Wierczinski B, Wiehl N, Wilk PA, Wirth G, Yakushev AB, von Zweidorf A. Attempts to chemically investigate element 112. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2006.94.4.181] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
Two experiments aiming at the chemical investigation of element 112 produced in the heavy ion induced nuclear fusion reaction of 48Ca with 238U were performed at the Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany. Both experiments were designed to determine the adsorption enthalpy of element 112 on a gold surface using a thermochromatography setup. The temperature range covered in the thermochromatography experiments allowed the adsorption of Hg at about 35 °C and of Rn at about -180 °C. Reports from the Flerov Laboratory for Nuclear Reactions (FLNR), Dubna, Russia claim production of a 5-min spontaneous fission (SF) activity assigned to 283112 for the 238U(48Ca,3n) 283112 reaction. Hence, Experiment I was designed to detect spontaneously fissioning (SF) isotopes of element 112 with half-lives (t
1/2) longer than about 20 s. 11 high-energy events were detected. 7 events exhibit a deposition pattern resembling a chromatographic peak in the vicinity of Rn deposition. However, the energy of the events observed in Experiment I was lower than expected for a SF-decay of 283112. Therefore, these events could not be unambiguously attributed to the decay of 283112. In contradiction with earlier publications newer reports from FLNR Dubna claim that 283112 decays by α-particle emission (E
α = 9.5 MeV) with t
1/2 = 4 s followed by a SF-decay of 279Ds (t
1/2 = 0.2 s). Therefore, Experiment II was designed to be sensitive to both claimed decay properties of 283112. However, during this experiment neither short α-SF correlations nor SF coincidences were detected. The conclusion is that 283112 was not unambiguously detected, neither in Experiment I nor in Experiment II.
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Yakushev AB, Zvara I, Oganessian YT, Belozerov AV, Dmitriev SN, Eichler B, Hübener S, Sokol EA, Türler A, Yeremin AV, Buklanov GV, Chelnokov ML, Chepigin VI, Gorshkov VA, Gulyaev AV, Lebedev VY, Malyshev ON, Popeko AG, Soverna S, Szeglowski Z, Timokhin SN, Tretyakova SP, Vasko VM, Itkis MG. Chemical identification and properties of element 112. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.91.8.433.20010] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
We present results of the second experiment on the chemical identification of element 112. Similar to the first test in 2000, we aimed at the production of the spontaneously fissioning 283112 nuclei with T
1/2≈3min. A natU3O8 (with some Nd) target, 2mg of U/cm2 thick, was bombarded with 233-MeV 48Ca ions (the energy in the middle of the target layer). The nuclei recoiling from the target were thermalized in flowing helium. The target chamber was connected through a 25m long capillary to detectors of α-particles and fission fragments. All the equipment and detectors were kept at ambient temperature. According to the test experiments, of all the heavy elements produced in the bombardment, only Hg, Rn and At could be transported to the detectors. The first detecting device was similar to that used earlier – an assembly of 8 pairs of PIPS detectors coated with gold. Here one would observe the decay of element 112 atoms if they like Hg adsorbed on gold. The atoms which were not retained and freely passed through the PIPS detectors entered a new, flow-through ionization chamber, 5000 cm3 in volume, optimized for detecting fission fragments. The PIPS detectors and the ionization chamber were placed inside a large assembly of 3He – filled neutron counters to detect prompt neutrons from the fission events. In 22.5 days, a beam dose of 2.8×1018 ions was accumulated. More than 95 of the simultaneously produced α-active 185Hg (T
1/2=49 s) were found deposited already on the first pair of PIPS detectors; meanwhile, all the PIPSs did not detect any fission event. In the ionization chamber, eight fission events were observed in coincidence with neutron counts while the expected background was insignificant. Hence, the spontaneous fissions of the volatile activity can be conclusively attributed to the decay of element 112 produced in the fusion reaction 48Ca+ 238U, and formerly observed in Dubna physical experiments. Evaluation of the experimental data in terms of the adsorption enthalpies indicates much weaker interaction of element 112 with Au than that of Hg. One can conclude that in the given chemical environment, element 112 behaves like Rn rather than like Hg. The formation cross section of 283112 estimated from the data amounts to several pb. The experiments were carried out at the Flerov Laboratory of Nuclear Reactions at JINR in November–December 2001.
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35
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Abstract
The chloride and oxychloride chemistry of the group 7 elements Tc and Re was investigated in order to develop an experimental approach to a gas chemical characterisation of bohrium (Bh, element 107). In thermochromatography experiments with trace amounts of101,104Tc and183,184Re the formation of one volatile compound was observed in O2/HCl containing carrier gas, which was attributed to MO3Cl (M = Tc, Re). From the measured deposition temperatures the adsorption enthalpies on quartz surfaces ΔHads(TcO3Cl) = -51 ± 3 kJ/mol and ΔHads(ReO3Cl) = -62 ± 3 kJ/mol were evaluated. The sublimation enthalpies were derived using an empirical correlation between Δ Hadsand ΔHsubl: ΔHsubl(TcO3Cl) = 49±10 kJ/mol and ΔHsubl(ReO3Cl) = 67±10 kJ/mol. A fast gas chemical separation technique for highly volatile compounds of short-lived isotopes based on isothermal gas solid adsorption chromatography (OLGA-principle) was developed. With a modified OLGA device, model studies with the short-lived nuclides106,107,108Tc and169,170,174,176Re were carried out in preparation of an experimental gas chemical investigation of bohrium (Bh, element 107). Separation times of less than 3 s were achieved. A good separation of the oxychlorides of group 7 elements from chloride and oxychloride compounds of152-155Er,151-154Ho (as models for actinide elements),98-101Nb,99-102Zr (as models for light transactinide elements),218Po, and214Bi was accomplished in this chemical system.
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36
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Kudejova P, Meierhofer G, Zeitelhack K, Jolie J, Schulze R, Türler A, Materna T. The new PGAA and PGAI facility at the research reactor FRM II in Garching near Munich. J Radioanal Nucl Chem 2008. [DOI: 10.1007/s10967-008-1506-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Zhernosekov K, Perego R, Dvorakova Z, Henkelmann R, Türler A. Target burn-up corrected specific activity of 177Lu produced via 176Lu(n, γ) 177Lu nuclear reactions. Appl Radiat Isot 2008; 66:1218-20. [DOI: 10.1016/j.apradiso.2008.02.058] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2007] [Revised: 01/23/2008] [Accepted: 02/04/2008] [Indexed: 11/25/2022]
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38
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Müller MC, Jüptner U, Wüllner U, Wirz S, Türler A, Wirtz DC, Hirner A, Standop J. [Parkinson's disease influences the perioperative risk profile in trauma patients]. Z Orthop Unfall 2008; 146:227-30. [PMID: 18404587 DOI: 10.1055/s-2008-1038330] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AIM Parkinson's disease (PD) is one of the most common degenerative diseases of the central nervous system affecting elderly patients with increasing demographic prevalence. The aim of this study was to define the perioperative risk profile in trauma patients suffering from Parkinson's disease in order to improve treatment options in these patients. METHOD Over a period of 13 years, 16 patients suffering from Parkinson's disease treated in the department of trauma surgery were retrospectively compared using matched-pair analysis with 16 controls not affected by PD. Both groups of patients were assessed regarding morbidity, length of treatment and rehabilitation. RESULTS Trauma patients suffering from Parkinson's disease showed an increase in morbidity risk. Postoperative falls occurred significantly, infections of the urinary tract and pneumonia tendentiously more often in PD patients. Postoperative stay and length of treatment were significantly longer in patients with PD. These patients also tended to stay longer preoperatively and remained longer in intensive care. PD patients required on-ward rehabilitation significantly more often. CONCLUSION Concomitant Parkinson's disease is a significant factor of perioperative morbidity in trauma patients. Perioperative morbidity in PD patients may be influenced by early diagnostic and therapeutic measures.
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Affiliation(s)
- M C Müller
- Klinik für Orthopädie und Unfallchirurgie, Universitätsklinikum Bonn
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39
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40
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Dvorak J, Brüchle W, Chelnokov M, Düllmann CE, Dvorakova Z, Eberhardt K, Jäger E, Krücken R, Kuznetsov A, Nagame Y, Nebel F, Nishio K, Perego R, Qin Z, Schädel M, Schausten B, Schimpf E, Schuber R, Semchenkov A, Thörle P, Türler A, Wegrzecki M, Wierczinski B, Yakushev A, Yeremin A. Observation of the 3n evaporation channel in the complete hot-fusion reaction 26Mg + 248Cm leading to the new superheavy nuclide 271Hs. Phys Rev Lett 2008; 100:132503. [PMID: 18517941 DOI: 10.1103/physrevlett.100.132503] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Indexed: 05/26/2023]
Abstract
The analysis of a large body of heavy ion fusion reaction data with medium-heavy projectiles (6 < or = Z < or = 18) and actinide targets suggests a disappearance of the 3n exit channel with increasing atomic number of the projectile. Here, we report a measurement of the excitation function of the reaction (248)Cm ((26)Mg,xn)(274-x)Hs and the observation of the new nuclide (271)Hs produced in the 3n evaporation channel at a beam energy well below the Bass fusion barrier with a cross section comparable to the maxima of the 4n and 5n channels. This indicates the possible discovery of new neutron-rich transactinide nuclei using relatively light heavy ion beams of the most neutron-rich stable isotopes and actinide targets.
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Affiliation(s)
- J Dvorak
- Technische Universität München, D-85748 Garching, Germany
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41
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Dvorakova Z, Henkelmann R, Lin X, Türler A, Gerstenberg H. Production of 177Lu at the new research reactor FRM-II: Irradiation yield of 176Lu177Lu. Appl Radiat Isot 2008; 66:147-51. [PMID: 17900914 DOI: 10.1016/j.apradiso.2007.08.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2007] [Revised: 08/16/2007] [Accepted: 08/23/2007] [Indexed: 11/23/2022]
Abstract
Due to its physical and chemical characteristics, 177Lu is a very attractive radionuclide for use in nuclear medicine. This paper introduces a method for a precise calculation of the irradiation yield of 177Lu produced by neutron activation of 176Lu in a nuclear reactor. The calculation is based on the Westcott convention which requires the knowledge of the neutron flux parameters. In this work, the neutron flux parameters of the new research reactor FRM-II (Garching, Germany) were determined and the stability of thermal neutron flux and thermal neutron flux temperature was monitored. The comparison of theoretically calculated and experimentally determined yield for Lu176(n,gamma)Lu177 reaction is presented.
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Affiliation(s)
- Z Dvorakova
- Institut für Radiochemie der Technischen Universität München, D-85748 Garching, Germany.
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42
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Türler A, Standop J, Schäfer N, Decker P, Hirner A, Decker D. [Port stapling for simplified port implantation in laparoscopic adjustable gastric banding]. Chirurg 2007; 78:828-32. [PMID: 17565476 DOI: 10.1007/s00104-007-1349-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND The purpose of this study was to evaluate the applicability of a port stapling device to simplify and improve port implantation in laparoscopic adjustable gastric banding (LAGB). METHODS From November 2005 to September 2006, a prospective study was conducted on 23 consecutive patients who underwent LAGB with Swedish adjustable gastric banding. Patients were randomized to either conventional titanium-port implantation or port stapling using the "Velocity" device. RESULTS No differences in age, body weight, body mass index, fascia depth or incision length were reported between the groups. Port implantation time was significantly less using port stapling (90+/-24 s) compared to conventional port implantation (521+/-138 s). Port related complaints postoperatively and at follow-up were equal in both groups. CONCLUSIONS Port stapling is an excellent tool to facilitate port implantation, particularly in massively obese patients with a thick abdominal wall.
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Affiliation(s)
- A Türler
- Klinik und Poliklinik für Allgemein-, Viszeral-, Thorax- und Gefässchirurgie, Universitätsklinikum Bonn, Sigmund-Freud-Strasse 25, 53105 Bonn, Germany.
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43
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Schaefer N, Tahara K, Schmidt J, Wehner S, Kalff JC, Abu-Elmagd K, Hirner A, Türler A. Resident macrophages are involved in intestinal transplantation-associated inflammation and motoric dysfunction of the graft muscularis. Am J Transplant 2007; 7:1062-70. [PMID: 17359514 DOI: 10.1111/j.1600-6143.2007.01747.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Gut manipulation and ischemia/reperfusion evoke an inflammatory response within the intestinal muscularis that contributes to dysmotility. We hypothesize that resident macrophages play a key role in initiating the inflammatory cascade. Isogenic small bowel transplantation was performed in Lewis rats. The impact of recovery of organs on muscularis inflammation was investigated by comparing cold whole-body perfusion after versus prior to recovery. The role of macrophages was investigated by transplantation of macrophage-depleted gut. Leukocytes were counted using muscularis whole mounts. Mediator expression was determined by real-time RT-PCR. Contractility was assessed in a standard organ bath. Both organ recovery and ischemia/reperfusion induced leukocyte recruitment and a significant upregulation in IL-6, MCP-1, ICAM-1 and iNOS mRNAs. Although organ recovery in cold ischemia prevented early gene expression, peak expression was not changed by modification of the recovery technique. Compared to controls, transplanted animals showed a 65% decrease in smooth muscle contractility. In contrast, transplanted macrophage-depleted isografts exhibited significant less leukocyte infiltration and only a 19% decrease in contractile activity. In summary, intestinal manipulation during recovery of organs initiates a functionally relevant inflammatory response within the intestinal muscularis that is massively intensified by the ischemia reperfusion injury. Resident muscularis macrophages participate in initiating this inflammatory response.
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Affiliation(s)
- N Schaefer
- Department of Surgery, Universitätsklinikum Bonn, Germany
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Dvorak J, Brüchle W, Chelnokov M, Dressler R, Düllmann CE, Eberhardt K, Gorshkov V, Jäger E, Krücken R, Kuznetsov A, Nagame Y, Nebel F, Novackova Z, Qin Z, Schädel M, Schausten B, Schimpf E, Semchenkov A, Thörle P, Türler A, Wegrzecki M, Wierczinski B, Yakushev A, Yeremin A. Doubly magic nucleus (108)(270)Hs162. Phys Rev Lett 2006; 97:242501. [PMID: 17280272 DOI: 10.1103/physrevlett.97.242501] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2006] [Revised: 08/09/2006] [Indexed: 05/13/2023]
Abstract
Theoretical calculations predict 270Hs (Z=108, N=162) to be a doubly magic deformed nucleus, decaying mainly by alpha-particle emission. In this work, based on a rapid chemical isolation of Hs isotopes produced in the 26Mg+248Cm reaction, we observed 15 genetically linked nuclear decay chains. Four chains were attributed to the new nuclide 270Hs, which decays by alpha-particle emission with Qalpha=9.02+/-0.03 MeV to 266Sg which undergoes spontaneous fission with a half-life of 444(-148)(+444) ms. A production cross section of about 3 pb was measured for 270Hs. Thus, 270Hs is the first nucleus for which experimental nuclear decay properties have become available for comparison with theoretical predictions of the N=162 shell stability.
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Affiliation(s)
- J Dvorak
- Technische Universität München, D-85748 Garching, Germany
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Schaefer N, Tahara K, Websky MV, Kalff JC, Hirner A, Türler A. Acute Rejection in Allogeneic Rodent Small Bowel Transplantation Causes Smooth Muscle Dysfunction via an Inflammatory Response Within the Intestinal Muscularis. Transplant Proc 2006; 38:1792-3. [PMID: 16908282 DOI: 10.1016/j.transproceed.2006.05.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Isogeneic intestinal transplantation elicits an inflammatory response within the intestinal muscularis that is associated with dysmotility. Usually the inflammation and the postoperative motor dysfunction resolve within a few days after small bowel transplantation (SBTx). However, the onset of acute rejection in allogeneic SBTx is again associated with dysmotility. We hypothesized that dysmotility during acute rejection is based on coexpression of kinetically active mediators by the alloreactive leucocyte infiltrate. MATERIALS AND METHODS Rat SBTx (BN to Lew and BN to BN) was performed without immunosuppression. Animals were sacrificed at 1, 4, and 7 days after SBTx. Leukocyte infiltration was investigated in muscularis whole mounts by immunohistochemistry. Mediator mRNA expression was determined by reverse transcriptase polymerase chain reaction. Muscle contractility was assessed in a standard organ bath. RESULTS Transplanted animals showed a significant inflammatory response within the muscularis at day 1 after SBTx. However, allogeneic transplanted animals exhibited a significant second inflammatory peak at day 7 (mRNA induction: iNOS 150-fold; tumor necrosis factor-alpha 18-fold; interferon-gamma 397-fold), parallel to the onset of rejection. This change was associated with a significant leukocyte infiltration. Compared to controls, allogeneic transplanted animals showed a 29% decrease in smooth muscle contractility on days 1 and 4 and a 71% decrease of contractility on postoperative day 7. CONCLUSIONS The motor dysfunction of transplanted small bowel during acute rejection is associated with an inflammatory reaction in the intestinal muscularis. The initial unspecific inflammation process immediately after transplantation is reactivated and intensified during acute rejection.
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Affiliation(s)
- N Schaefer
- Department of Surgery, Rheinische Friedrich-Wilhelms-Universität, Sigmund-Freud-Strasse 25, D-53105 Bonn, Germany.
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Schaefer N, Tahara K, Schmidt J, Zobel S, Kalff JC, Hirner A, Türler A. Mechanism and Impact of Organ Harvesting and Ischemia-Reperfusion Injury Within the Graft Muscularis in Rat Small Bowel Transplantation. Transplant Proc 2006; 38:1821-2. [PMID: 16908292 DOI: 10.1016/j.transproceed.2006.05.048] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
INTRODUCTION Inflammatory events within the gut muscularis contribute to dysmotility. We hypothesized that manipulation during organ harvesting initiated an inflammatory response via muscularis macrophages and that this cascade was amplified during reperfusion. METHODS Small bowel transplantation was performed in Lewis rats. To investigate the impact of organ harvesting on muscularis inflammation, cold whole-body perfusion was performed after versus prior to organ harvesting. The role of macrophages was investigated by transplantation of the macrophage-depleted gut. Leukocyte infiltration was investigated in muscularis whole mounts. Mediator mRNA expression was determined by real-time reverse transcriptase polymerase chain reaction. Contractility was assessed in a standard organ bath. RESULTS Organ harvesting and ischemia-reperfusion induced leukocyte recruitment and mRNA upregulation in the muscularis: interleukin-6 12217-fold, monocyte chemoattractant protein-1 62-fold, ICAM-1 12-fold, cyclooxygenase-2: 8-fold, iNOS: 150-fold. Although organ harvesting with cold ischemia prevented early gene expression, peak expression at 3-hour reperfusion was not changed by modification of the harvesting technique. Compared to controls, transplanted animals showed a 63% decrease in smooth muscle contractility. In contrast, transplanted macrophage-depleted gut exhibited significantly fewer leukocytes and only a 16% decrease in contractility. CONCLUSIONS Gut manipulation during organ harvesting initiates an inflammatory response within the muscularis that is massively intensified during reperfusion. This change contributes to muscular dysfunction. Furthermore, the results suggested that resident macrophages play a key role in initiating this process.
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Affiliation(s)
- N Schaefer
- Department of Surgery, Faculty of Medicine, Rheinische Friedrich-Wilhelms-Universität, Sigmund-Freud-Strasse 25, Bonn D-53105, Germany
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Müller M, Burger C, Standop J, Kovacs A, Hirner A, Rangger C, Türler A. [Helical computed tomography in penetrating injury to the torso. Diagnostic value in emergent use]. Chirurg 2006; 77:815-20. [PMID: 16775681 DOI: 10.1007/s00104-006-1189-0] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND Nontherapeutic laparotomy and thoracotomy rates in penetrating torso trauma remain high. The aim of this study was to define the value of helical computed tomography (CT) in this emergency situation. MATERIAL AND METHODS Retrospectively, we studied 11 hemodynamically stable patients with penetrating injury to the torso admitted to our trauma center over a 3-year period who underwent intravenous contrasted helical CT immediately after admission. A positive CT scan was defined as showing any evidence of intrathoracal or intra-abdominal injury necessitating immediate operation. Patients with positive CT underwent laparotomy and/or thoracotomy. Patients with negative CT were observed. RESULTS Eleven consecutive patients were studied: nine male, two female; mean age 39 years (range 19-62). Nine stab wounds and two shotgun wounds were seen. Seven patients had positive helical CT findings, and four patients were negative. All patients with positive CT findings were operated on; those with negative scans recovered uneventfully. This imaging method accurately predicted whether thoracotomy or laparotomy was needed in 10/11 cases. CONCLUSION In penetrating torso trauma, helical CT can clarify the need for thoracotomy or laparotomy vs nonoperative treatment.
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Affiliation(s)
- M Müller
- Klinik und Poliklinik für Unfallchirurgie, Universitätsklinikum Bonn, Bonn.
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Kudějová P, Materna T, Jolie J, Türler A, Wilk P, Baechler S, Kasztovszky Z, Révay Z, Belgya T. On the construction of a new instrument for cold-neutron prompt gamma-ray activation analysis at the FRM-II. J Radioanal Nucl Chem 2005. [DOI: 10.1007/s10967-005-0812-8] [Citation(s) in RCA: 6] [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]
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Jaeger E, Tschampa H, Flacke S, Türler A, Decker D, Schmiedel A, Schild HH. Fragestellungen und Befunde bei radiologischer Kontrolle nach Magenbandoperation. ROFO-FORTSCHR RONTG 2005. [DOI: 10.1055/s-2005-867529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Maintz D, Fischbach R, Schäfer N, Türler A, Kugel H, Schäfer H, Wagner M, Lackner K. Lokale Therapie von Leber-metastasen kolorektaler Karzinome. Lasertherapie vs. Gleichstrombehandlung im Rattenmodell. ROFO-FORTSCHR RONTG 2004. [DOI: 10.1055/s-2001-13337-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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