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Volumn 345, Issue 3, 2013, Pages 150-159

Nuclear field shift in natural environments

Author keywords

CAIs; Isotopes; Meteorites; Nuclear Field Shift; Uranium

Indexed keywords

CHEMICAL COMPOSITION; HEAVY METAL; ISOTOPIC COMPOSITION; ISOTOPIC FRACTIONATION; METEORITE; URANIUM;

EID: 84878518991     PISSN: 16310713     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.crte.2013.01.004     Document Type: Article
Times cited : (42)

References (80)
  • 1
    • 42149113371 scopus 로고    scopus 로고
    • An ab initio study based on a finite nucleus model for isotope fractionation in the U(III)-U(IV) exchange reaction system
    • Abe M., Suzuki T., Fujii Y., Hada M. An ab initio study based on a finite nucleus model for isotope fractionation in the U(III)-U(IV) exchange reaction system. J. Chem. Phys. 2008, 128:144309.
    • (2008) J. Chem. Phys. , vol.128 , pp. 144309
    • Abe, M.1    Suzuki, T.2    Fujii, Y.3    Hada, M.4
  • 2
    • 77955701125 scopus 로고    scopus 로고
    • Ligand effect on uranium isotope fractionations caused by nuclear volume effects: an ab initio relativistic molecular orbital study
    • Abe M., Suzuki T., Fujii Y., Hada M., Hirao K. Ligand effect on uranium isotope fractionations caused by nuclear volume effects: an ab initio relativistic molecular orbital study. J. Chem. Phys. 2010, 133:044309.
    • (2010) J. Chem. Phys. , vol.133 , pp. 044309
    • Abe, M.1    Suzuki, T.2    Fujii, Y.3    Hada, M.4    Hirao, K.5
  • 3
    • 76249108642 scopus 로고    scopus 로고
    • The odds and evens of mercury isotopes: applications of mass-dependent and mass-independent isotope fractionation
    • Bergquist R.A., Blum J.D. The odds and evens of mercury isotopes: applications of mass-dependent and mass-independent isotope fractionation. Elements 2009, 5:353-357.
    • (2009) Elements , vol.5 , pp. 353-357
    • Bergquist, R.A.1    Blum, J.D.2
  • 4
    • 0029891386 scopus 로고    scopus 로고
    • Nuclear size and shape effects in chemical reactions. Isotope chemistry of the heavy elements
    • Bigeleisen J. Nuclear size and shape effects in chemical reactions. Isotope chemistry of the heavy elements. J. Am. Chem. Soc. 1996, 118:3676-3680.
    • (1996) J. Am. Chem. Soc. , vol.118 , pp. 3676-3680
    • Bigeleisen, J.1
  • 5
    • 36849137629 scopus 로고
    • Calculation of equilibrium constants for isotopic exchange reactions
    • Bigeleisen J., Mayer M.G. Calculation of equilibrium constants for isotopic exchange reactions. J. Chem. Phys. 1947, 15:261-267.
    • (1947) J. Chem. Phys. , vol.15 , pp. 261-267
    • Bigeleisen, J.1    Mayer, M.G.2
  • 7
    • 0001092114 scopus 로고
    • Chromium isotopic anomalies in Allende refractory inclusions
    • Birck J.L., Allègre C.J. Chromium isotopic anomalies in Allende refractory inclusions. Geophys. Res. Lett. 1984, 12:745-748.
    • (1984) Geophys. Res. Lett. , vol.12 , pp. 745-748
    • Birck, J.L.1    Allègre, C.J.2
  • 10
    • 84862200981 scopus 로고    scopus 로고
    • Uranium isotope compositions of the basaltic angrite meteorites and the chronological implications for the early Solar System
    • Brennecka G., Wadhwa M. Uranium isotope compositions of the basaltic angrite meteorites and the chronological implications for the early Solar System. Proc. Natl. Acad. Sci. U. S. A. 2012, 109:9299-9303.
    • (2012) Proc. Natl. Acad. Sci. U. S. A. , vol.109 , pp. 9299-9303
    • Brennecka, G.1    Wadhwa, M.2
  • 14
    • 80055078582 scopus 로고    scopus 로고
    • Rapid expansion of oceanic anoxia immediately before the end-Permian mass extinction
    • Brennecka G.A., Herrmann A.D., Algeo T.J., Anbar A.D. Rapid expansion of oceanic anoxia immediately before the end-Permian mass extinction. Proc. Natl. Acad. Sci. U. S. A. 2011, 108:17631-17634.
    • (2011) Proc. Natl. Acad. Sci. U. S. A. , vol.108 , pp. 17631-17634
    • Brennecka, G.A.1    Herrmann, A.D.2    Algeo, T.J.3    Anbar, A.D.4
  • 16
    • 81355149338 scopus 로고    scopus 로고
    • Molybdenum isotope anomalies in meteorites: constraints on solar nebula evolution and origin of the Earth
    • Burkhardt C., Kleine T., Oberli F., Pack A., Bourdon B., Wieler R. Molybdenum isotope anomalies in meteorites: constraints on solar nebula evolution and origin of the Earth. Earth Planet. Sci. Lett. 2011, 312:390-400.
    • (2011) Earth Planet. Sci. Lett. , vol.312 , pp. 390-400
    • Burkhardt, C.1    Kleine, T.2    Oberli, F.3    Pack, A.4    Bourdon, B.5    Wieler, R.6
  • 17
    • 0003210589 scopus 로고    scopus 로고
    • Inorganic speciation of dissolved elements in seawater: the influence of pH on concentration ratios
    • Byrne R.H. Inorganic speciation of dissolved elements in seawater: the influence of pH on concentration ratios. Geochem. Trans. 2002, 3:11-16.
    • (2002) Geochem. Trans. , vol.3 , pp. 11-16
    • Byrne, R.H.1
  • 18
    • 77953123789 scopus 로고    scopus 로고
    • Ruthenium endemic isotope effects in chondrites and differentiated meteorites
    • Chen J.H., Papanastassiou D.A., Wasserburg G.J. Ruthenium endemic isotope effects in chondrites and differentiated meteorites. Geochim. Cosmochim. Acta 2010, 74:3851-3862.
    • (2010) Geochim. Cosmochim. Acta , vol.74 , pp. 3851-3862
    • Chen, J.H.1    Papanastassiou, D.A.2    Wasserburg, G.J.3
  • 20
    • 0000714524 scopus 로고
    • A component of primitive nuclear composition in carbonaceous meteorites
    • Clayton R.N., Grossman L., Mayeda T.K. A component of primitive nuclear composition in carbonaceous meteorites. Science 1977, 182:485-488.
    • (1977) Science , vol.182 , pp. 485-488
    • Clayton, R.N.1    Grossman, L.2    Mayeda, T.K.3
  • 22
    • 84878520970 scopus 로고    scopus 로고
    • Measuring the isotopic composition of small (<5ng) U samples by MC-ICP-MS
    • Connelly J., Bizzarro M. Measuring the isotopic composition of small (<5ng) U samples by MC-ICP-MS. Mineral. Mag. 2011, 75:692.
    • (2011) Mineral. Mag. , vol.75 , pp. 692
    • Connelly, J.1    Bizzarro, M.2
  • 23
    • 0039739461 scopus 로고
    • The origin of the " FUN" anomalies and the high temperature inclusions in the Allende meteorite
    • Consolmagno G.J., Cameron A.G.W. The origin of the " FUN" anomalies and the high temperature inclusions in the Allende meteorite. Moon Planets 1980, 23:3-25.
    • (1980) Moon Planets , vol.23 , pp. 3-25
    • Consolmagno, G.J.1    Cameron, A.G.W.2
  • 24
    • 0010818922 scopus 로고    scopus 로고
    • Molybdenum evidence for inherited planetary scale isotope heterogeneity of the protosolar nebula
    • Dauphas N., Marty B., Reisberg L. Molybdenum evidence for inherited planetary scale isotope heterogeneity of the protosolar nebula. Astrophys. J. 2002, 565:640-644.
    • (2002) Astrophys. J. , vol.565 , pp. 640-644
    • Dauphas, N.1    Marty, B.2    Reisberg, L.3
  • 27
    • 33745196068 scopus 로고    scopus 로고
    • Nuclear field vs. nucleosynthetic effects as cause of isotopic anomalies in the early Solar System
    • Fujii T., Moynier F., Albarède F. Nuclear field vs. nucleosynthetic effects as cause of isotopic anomalies in the early Solar System. Earth Planet. Sci. Lett. 2006, 247:1-9.
    • (2006) Earth Planet. Sci. Lett. , vol.247 , pp. 1-9
    • Fujii, T.1    Moynier, F.2    Albarède, F.3
  • 28
    • 33748549308 scopus 로고    scopus 로고
    • Mass-independent isotope fractionation of molybdenum and ruthenium and the origin of isotopic anomalies in Murchison
    • Fujii T., Moynier F., Telouk P., Albarède F. Mass-independent isotope fractionation of molybdenum and ruthenium and the origin of isotopic anomalies in Murchison. Astrophys. J. 2006, 647:1506-1516.
    • (2006) Astrophys. J. , vol.647 , pp. 1506-1516
    • Fujii, T.1    Moynier, F.2    Telouk, P.3    Albarède, F.4
  • 29
    • 70349247733 scopus 로고    scopus 로고
    • The nuclear field shift effect in chemical exchange reactions
    • Fujii T., Moynier F., Albarède F. The nuclear field shift effect in chemical exchange reactions. Chem. Geol. 2009, 267:139-156.
    • (2009) Chem. Geol. , vol.267 , pp. 139-156
    • Fujii, T.1    Moynier, F.2    Albarède, F.3
  • 30
    • 70349238817 scopus 로고    scopus 로고
    • Nuclear field shift effect in the isotope exchange reaction of cadmium using a crown ether
    • Fujii T., Moynier F., Telouk P., Albarède F. Nuclear field shift effect in the isotope exchange reaction of cadmium using a crown ether. Chem. Geol. 2009, 267:157-163.
    • (2009) Chem. Geol. , vol.267 , pp. 157-163
    • Fujii, T.1    Moynier, F.2    Telouk, P.3    Albarède, F.4
  • 31
    • 70350523944 scopus 로고    scopus 로고
    • Mass-dependent and mass-independent isotope effects of zinc in a redox reaction
    • Fujii T., Moynier F., Uehara A., Abe M., Yin Q.Z., Nagai T., Yamana H. Mass-dependent and mass-independent isotope effects of zinc in a redox reaction. J. Phys. Chem. A 2009, 113:12225-12232.
    • (2009) J. Phys. Chem. A , vol.113 , pp. 12225-12232
    • Fujii, T.1    Moynier, F.2    Uehara, A.3    Abe, M.4    Yin, Q.Z.5    Nagai, T.6    Yamana, H.7
  • 36
    • 0034234770 scopus 로고    scopus 로고
    • Anomaly of Gd-155 and Gd-157 isotope effects in ligand exchange reactions observed by ion exchange chromatography
    • Ismail I.M., Fukami A., Nomura M., Fujii Y. Anomaly of Gd-155 and Gd-157 isotope effects in ligand exchange reactions observed by ion exchange chromatography. Anal. Chem. 2000, 72:2841-2845.
    • (2000) Anal. Chem. , vol.72 , pp. 2841-2845
    • Ismail, I.M.1    Fukami, A.2    Nomura, M.3    Fujii, Y.4
  • 40
    • 0035652399 scopus 로고    scopus 로고
    • Specific effects of heavy nuclei in chemical equilibrium
    • Knyazev D.A., Myasoedov N.F. Specific effects of heavy nuclei in chemical equilibrium. Sep. Sci. Technol. 2001, 36:1677-1696.
    • (2001) Sep. Sci. Technol. , vol.36 , pp. 1677-1696
    • Knyazev, D.A.1    Myasoedov, N.F.2
  • 41
    • 0012422351 scopus 로고    scopus 로고
    • Acquisition of elements from seawater by ferromanganese crusts: solid phase association and seawater speciation
    • Koschinsky A., Hein J.R. Acquisition of elements from seawater by ferromanganese crusts: solid phase association and seawater speciation. Mar. Geol. 2003, 198:331-351.
    • (2003) Mar. Geol. , vol.198 , pp. 331-351
    • Koschinsky, A.1    Hein, J.R.2
  • 42
    • 49449122259 scopus 로고
    • Uranium in the open ocean: concentration and isotopic composition
    • Ku T.L., Knauss K., Mathieu G.G. Uranium in the open ocean: concentration and isotopic composition. Deep-Sea Res. 1977, 24:1005-1017.
    • (1977) Deep-Sea Res. , vol.24 , pp. 1005-1017
    • Ku, T.L.1    Knauss, K.2    Mathieu, G.G.3
  • 44
    • 0001925813 scopus 로고
    • Barium and neodymium isotopic anomalies in the Allende meteorite
    • McCulloch M.T., Wasserburg G.J. Barium and neodymium isotopic anomalies in the Allende meteorite. Astrophys. J. 1978, 220:L15-L19.
    • (1978) Astrophys. J. , vol.220
    • McCulloch, M.T.1    Wasserburg, G.J.2
  • 45
    • 84902850469 scopus 로고
    • More anomalies from the Allende meteorite: samarium
    • McCulloch M.T., Wasserburg G.J. More anomalies from the Allende meteorite: samarium. Geophys. Res. Lett. 1978, 5:599-602.
    • (1978) Geophys. Res. Lett. , vol.5 , pp. 599-602
    • McCulloch, M.T.1    Wasserburg, G.J.2
  • 46
    • 77954002130 scopus 로고    scopus 로고
    • Global enhancement of ocean anoxia during the OAE-2: a quantitative approach using U isotopes
    • Montoya-Pino C., et al. Global enhancement of ocean anoxia during the OAE-2: a quantitative approach using U isotopes. Geology 2010, 38:315-318.
    • (2010) Geology , vol.38 , pp. 315-318
    • Montoya-Pino, C.1
  • 47
    • 33746845700 scopus 로고    scopus 로고
    • Europium isotopic variations in Allende CAIs and the nature of mass-dependent fractionation in the solar nebula
    • Moynier F., Bouvier A., Blichert-Toft J., Telouk P., Gasperini D., Albarède F. Europium isotopic variations in Allende CAIs and the nature of mass-dependent fractionation in the solar nebula. Geochim. Cosmochim. Acta 2006, 70:4287-4294.
    • (2006) Geochim. Cosmochim. Acta , vol.70 , pp. 4287-4294
    • Moynier, F.1    Bouvier, A.2    Blichert-Toft, J.3    Telouk, P.4    Gasperini, D.5    Albarède, F.6
  • 48
    • 76749157527 scopus 로고    scopus 로고
    • Nuclear field shift effect as a possible cause of Te isotopic anomalies in the early solar system - An alternative explanation of Fehr et al. (2006 and 2009)
    • Moynier F., Fujii T., Albarède F. Nuclear field shift effect as a possible cause of Te isotopic anomalies in the early solar system - An alternative explanation of Fehr et al. (2006 and 2009). Meteorit. Planet. Sci. 2009, 44:1735-1742.
    • (2009) Meteorit. Planet. Sci. , vol.44 , pp. 1735-1742
    • Moynier, F.1    Fujii, T.2    Albarède, F.3
  • 49
  • 50
    • 84866953162 scopus 로고    scopus 로고
    • Planetary-scale strontium isotopic heterogeneity and the age of volatile depletion of early solar system materials
    • Moynier F., Day J.M.D., Okui W., Yokoyama T., Bouvier A., Walker R., Podosek F. Planetary-scale strontium isotopic heterogeneity and the age of volatile depletion of early solar system materials. Astrophys. J. 2012, 758:45.
    • (2012) Astrophys. J. , vol.758 , pp. 45
    • Moynier, F.1    Day, J.M.D.2    Okui, W.3    Yokoyama, T.4    Bouvier, A.5    Walker, R.6    Podosek, F.7
  • 52
    • 84878480747 scopus 로고    scopus 로고
    • Thallium isotopes and their application to problems in earth and environmental science
    • Springer, Berlin, M. Baskaran (Ed.)
    • Nielsen S.G., Rehkämper M. Thallium isotopes and their application to problems in earth and environmental science. Handbook of Environmental Isotope Geochemistry 2011, Springer, Berlin. M. Baskaran (Ed.).
    • (2011) Handbook of Environmental Isotope Geochemistry
    • Nielsen, S.G.1    Rehkämper, M.2
  • 53
    • 1342320606 scopus 로고    scopus 로고
    • The precise and accurate determination of thallium isotope compositions and concentrations for water samples by MC-ICPMS
    • Nielsen S.G., Rehkämper M., Baker J., Halliday A.N. The precise and accurate determination of thallium isotope compositions and concentrations for water samples by MC-ICPMS. Chem. Geol. 2004, 204:109-124.
    • (2004) Chem. Geol. , vol.204 , pp. 109-124
    • Nielsen, S.G.1    Rehkämper, M.2    Baker, J.3    Halliday, A.N.4
  • 55
    • 31144439471 scopus 로고    scopus 로고
    • Thallium isotopic evidence for ferromanganese sediments in the mantle source of Hawaiian basalts
    • Nielsen S.G., Rehkämper M., Norman M.D., Halliday A.N., Harrison D. Thallium isotopic evidence for ferromanganese sediments in the mantle source of Hawaiian basalts. Nature 2006, 239:314-317.
    • (2006) Nature , vol.239 , pp. 314-317
    • Nielsen, S.G.1    Rehkämper, M.2    Norman, M.D.3    Halliday, A.N.4    Harrison, D.5
  • 58
    • 0000968848 scopus 로고
    • Ubiquitous isotopic anomalies in Ti from normal Allende inclusions
    • Niemeyer S., Lugmair G.W. Ubiquitous isotopic anomalies in Ti from normal Allende inclusions. Earth Planet. Sci. Lett. 1981, 53:211-225.
    • (1981) Earth Planet. Sci. Lett. , vol.53 , pp. 211-225
    • Niemeyer, S.1    Lugmair, G.W.2
  • 60
    • 0028516751 scopus 로고
    • Separation of strontium and barium isotopes using a crown-ether - Different behaviors of odd-mass and even mass isotopes
    • Nishizawa K., Nakamura K., Yamamoto T., Masuda T. Separation of strontium and barium isotopes using a crown-ether - Different behaviors of odd-mass and even mass isotopes. Solvent Extr. Ion Exch. 1994, 12:1073-1084.
    • (1994) Solvent Extr. Ion Exch. , vol.12 , pp. 1073-1084
    • Nishizawa, K.1    Nakamura, K.2    Yamamoto, T.3    Masuda, T.4
  • 61
    • 84859270098 scopus 로고    scopus 로고
    • Oxidative scavenging of thallium by birnessite: controls on thallium sorption and stable isotope fractionation in marine ferromanganese precipitates
    • Peacock C.L., Moon E.M. Oxidative scavenging of thallium by birnessite: controls on thallium sorption and stable isotope fractionation in marine ferromanganese precipitates. Geochim. Cosmochim. Acta 2012, 84:297-313.
    • (2012) Geochim. Cosmochim. Acta , vol.84 , pp. 297-313
    • Peacock, C.L.1    Moon, E.M.2
  • 62
    • 1142277933 scopus 로고    scopus 로고
    • The mass balance of dissolved thallium in the oceans
    • Rehkämper M., Nielsen S.G. The mass balance of dissolved thallium in the oceans. Mar. Chem. 2004, 85:125-139.
    • (2004) Mar. Chem. , vol.85 , pp. 125-139
    • Rehkämper, M.1    Nielsen, S.G.2
  • 64
    • 1342331848 scopus 로고    scopus 로고
    • Cenozoic marine geochemistry of thallium deduced from isotopic studies of ferromanganese crusts and pelagic sediments
    • Rehkämper M., Frank M., Hein J.R., Halliday A. Cenozoic marine geochemistry of thallium deduced from isotopic studies of ferromanganese crusts and pelagic sediments. Earth Planet. Sci. Lett. 2004, 218:77-91.
    • (2004) Earth Planet. Sci. Lett. , vol.218 , pp. 77-91
    • Rehkämper, M.1    Frank, M.2    Hein, J.R.3    Halliday, A.4
  • 65
    • 0033613327 scopus 로고    scopus 로고
    • Isotopic " fingerprints" for natural uranium ore samples
    • Richter S. Isotopic " fingerprints" for natural uranium ore samples. Int. J. Mass Spectrom. 1999, 193:9-14.
    • (1999) Int. J. Mass Spectrom. , vol.193 , pp. 9-14
    • Richter, S.1
  • 67
    • 34147131210 scopus 로고    scopus 로고
    • Role of nuclear volume in driving equilibrium stable isotope fractionation of mercury, thallium, and other very heavy elements
    • Schauble E.A. Role of nuclear volume in driving equilibrium stable isotope fractionation of mercury, thallium, and other very heavy elements. Geochim. Cosmochim. Acta 2007, 71:2170-2189.
    • (2007) Geochim. Cosmochim. Acta , vol.71 , pp. 2170-2189
    • Schauble, E.A.1
  • 68
    • 70549106958 scopus 로고    scopus 로고
    • Calcium isotope composition of meteorites, Earth, and Mars
    • Simon J.I., DePaolo D.J., Moynier F. Calcium isotope composition of meteorites, Earth, and Mars. Astrophys. J. 2009, 702:707-715.
    • (2009) Astrophys. J. , vol.702 , pp. 707-715
    • Simon, J.I.1    DePaolo, D.J.2    Moynier, F.3
  • 71
    • 0020656027 scopus 로고
    • The mass-independent fractionation of oxygen: a novel isotope effect and its possible cosmochemical implications
    • Thiemens M.H., Heindrich J.E. The mass-independent fractionation of oxygen: a novel isotope effect and its possible cosmochemical implications. Science 1983, 219:1073-1075.
    • (1983) Science , vol.219 , pp. 1073-1075
    • Thiemens, M.H.1    Heindrich, J.E.2
  • 72
    • 37049172817 scopus 로고
    • The thermodynamic properties of isotopic substances
    • Urey H.C. The thermodynamic properties of isotopic substances. J. Chem. Soc. 1947, 562-581.
    • (1947) J. Chem. Soc. , pp. 562-581
    • Urey, H.C.1
  • 73
    • 0011973270 scopus 로고    scopus 로고
    • Stable isotope geochemistry. Reviews in Mineralogy and Geochemistry
    • Valley J.W., Cole D.R. Stable isotope geochemistry. Reviews in Mineralogy and Geochemistry. Mineral. Soc. Am. 2001, 43:662.
    • (2001) Mineral. Soc. Am. , vol.43 , pp. 662
    • Valley, J.W.1    Cole, D.R.2
  • 76
    • 84945093453 scopus 로고
    • Correlated O and MG isotopic anomalies in Allende inclusions. II - Magnesium
    • Wasserburg G.J., Lee T., Papanastassiou D.A. Correlated O and MG isotopic anomalies in Allende inclusions. II - Magnesium. Geophys. Res. Lett. 1977, 4:299-302.
    • (1977) Geophys. Res. Lett. , vol.4 , pp. 299-302
    • Wasserburg, G.J.1    Lee, T.2    Papanastassiou, D.A.3
  • 78
    • 0037148860 scopus 로고    scopus 로고
    • Diverse supernova sources of pre-solar material inferred from molybdenum isotopes in meteorites
    • Yin Q., Jacobsen S.B., Yamashita K. Diverse supernova sources of pre-solar material inferred from molybdenum isotopes in meteorites. Nature 2002, 415:881-883.
    • (2002) Nature , vol.415 , pp. 881-883
    • Yin, Q.1    Jacobsen, S.B.2    Yamashita, K.3
  • 79
    • 27244445723 scopus 로고    scopus 로고
    • The isotope geochemistry and cosmochemistry of magnesium
    • Mineralogical Society of America, Washington DC, [Vol. 55], C.M. Johnson, B.L. Beard, F. Albarède (Eds.)
    • Young E.D., Galy A. The isotope geochemistry and cosmochemistry of magnesium. Review in Mineralogy and Geochemistry 2004, 197-230. Mineralogical Society of America, Washington DC, [Vol. 55]. C.M. Johnson, B.L. Beard, F. Albarède (Eds.).
    • (2004) Review in Mineralogy and Geochemistry , pp. 197-230
    • Young, E.D.1    Galy, A.2
  • 80
    • 77950190264 scopus 로고    scopus 로고
    • Nuclear field shift effect in isotope fractionation of mercury during. Abiotic reduction in the absence of light
    • Zheng W., Hintelmann H. Nuclear field shift effect in isotope fractionation of mercury during. Abiotic reduction in the absence of light. J. Chem. Phys. A 2010, 114:4238-4245.
    • (2010) J. Chem. Phys. A , vol.114 , pp. 4238-4245
    • Zheng, W.1    Hintelmann, H.2


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