Co2?+? interaction with Azospirillum brasilense Sp7 cells: a 57Co emission M?ssbauer spectroscopic study |
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Authors: | Alexander A Kamnev Anna V Tugarova Borbála Biró Krisztina Kovács Zoltán Homonnay Ern? Kuzmann Attila Vértes |
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Institution: | 1. Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada 2. Institute of Materials Science, NCSR Demokritos, Aghia Paraskevi 153 10, Athens, Greece
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Abstract: | The Thylacine Hole–001 meteorite was recovered from the Nullarbor Desert (Australia) in 1977 and is an Ordinary Chondrite, Group H4/5br, which has undergone moderate to severe (B/C) weathering. We have characterised the Fe-bearing phases in Thylacine Hole–001 by 57Fe M?ssbauer Spectroscopy at 300?K, 100?K, 50?K and 4?K. The spectrum at 300?K is dominated by the paramagnetic doublets of Olivine, Pyroxene and a Ferric component which is most likely nanoparticulate Goethite. Magnetically split sextets due to Maghemite or Magnetite are also present, consistent with the relatively advanced terrrestrial age of 28,500 yrs The nanoparticulate Goethite component shows a blocked, magnetically split sextet at low temperatures. We also observe the effects of magnetic ordering of the Olivine and Pyroxene below 50?K. |
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