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  • 1.
    Holm, Nils
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Dumont, Marion
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Ivarsson, Magnus
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Konn, Cécile
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Alkaline fluid circulation in ultramafic rocks and formation of nucleotide constituents: A hypothesis2006In: Geochemical transactions, Vol. 7, no 7Article in journal (Refereed)
  • 2.
    Ivarsson, Magnus
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Advantages of doubly polished thin sections for the study of microfossils in volcanic rock2006In: Geochemical TransactionsArticle in journal (Refereed)
  • 3.
    Ivarsson, Magnus
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Hydrothermal systems at the Emperor Seamounts capable of supporting a deep biosphere: an analogue to volcanism and possible hydrothermal activity on other terrestrial planets.2006In: Nordic Astrobiology 2006, Origin and distribution of Life in the Universe: A Nordic Perspective, 2006Conference paper (Refereed)
  • 4.
    Ivarsson, Magnus
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Microbial activity in zeolites deduced from mineral inclusions2008In: Origins of Life and Evolution of Biospheres 36, 2008Conference paper (Refereed)
  • 5.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Broman, Curt
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Lindblom, Sten
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Fluid inclusions as a tool to constrain the preservation conditions of sub-seafloor cryptoendoliths2009In: Planetary and Space Science, Vol. 57, p. 477-490Article in journal (Refereed)
  • 6.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Gehör, Seppo
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Micro-scale variations of iron isotopes in fossilized microorganisms2008In: International Journal of AstrobiologyArticle in journal (Refereed)
  • 7.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Fossilized microorganisms from Emperor Seamounts: evidence for a deep sub-seafloor biosphere2007In: 17th Annual V.M. Goldschmidt Conference, 2007Conference paper (Refereed)
  • 8.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Fossilized microorganisms from Emperor Seamounts: evidence for a deep sub-seafloor biosphere2007Conference paper (Other academic)
  • 9.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Microbial colonization of various habitable niches during alteration of oceanic crust2008In: International Geological Congress, 2008Conference paper (Refereed)
  • 10.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Microbial colonization of various habitable niches during alteration of oceanic crust2008In: Links Between Geological Processes, Microbial Activities and Evolution of Life, 2008Chapter in book (Refereed)
  • 11.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Mn as a potential energy source for subseafloor chemoautotrophs2006In: 16th Annual V.M. Goldschmidt Conference, 2006Conference paper (Refereed)
  • 12.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Lausmaa, Jukka
    Lindblom, Sten
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Broman, Curt
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Fossilized microorganisms from the Emperor Seamounts: implications for the search for a sub-surface fossil record on Earth and Mars2008In: AstrobiologyArticle in journal (Refereed)
  • 13.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Lindblom, Sten
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Broman, Curt
    Naturhistoriska riksmuseet.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Fossilized microorganisms associated with zeolite-carbonate interfaces in sub-seafloor hydrothermal environments2008In: Geobiology, ISSN 1472-4677, E-ISSN 1472-4669, Vol. 6, no 2, p. 155-170Article in journal (Refereed)
    Abstract [en]

    In this paper we describe carbon-rich filamentous structures observed in association with the zeolite mineral phillipsite from sub-seafloor samples drilled and collected during the Ocean Drilling Program (ODP) Leg 197 at the Emperor Seamounts. The filamentous structures are ~5 µm thick and ~100–200 µm in length. They are found attached to phillipsite surfaces in veins and entombed in vein-filling carbonates. The carbon content of the filaments ranges between ~10 wt% C and 55 wt% C. They further bind to propidium iodide (PI), which is a dye that binds to damaged cell membranes and remnants of DNA.

    Carbon-rich globular microstructures, 1–2 µm in diameter, are also found associated with the phillipsite surfaces as well as within wedge-shaped cavities in phillipsite assemblages. The globules have a carbon content that range between ~5 wt% C and 55 wt% C and they bind to PI. Ordinary globular iron oxides found throughout the samples differ in that they contain no carbon and do not bind to the dye PI. The carbon-rich globules are mostly concentrated to a film-like structure that is attached to the phillipsite surfaces. This film has a carbon content that ranges between ~25 wt% C and 75 wt% C and partially binds to PI. EDS analyses show that the carbon in all structures described are not associated with calcium and therefore not bound in carbonates. The carbon content and the binding to PI may indicate that the filamentous structures could represent fossilized filamentous microorganisms, the globules could represent fossilized microbial cells and the film-like structures could represent a microbially produced biofilm.

    Our results extend the knowledge of possible habitable niches for a deep biosphere in sub-seafloor environments and suggests, as phillipsite is one of the most common zeolite mineral in volcanic rocks of the oceanic crust, that it could be a common feature in the oceanic crust elsewhere.

  • 14.
    Ivarsson, Magnus
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Lindblom, Sten
    Broman, Curt
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Fossilized microorganisms associated with zeolites-carbonate interfaces in sub-seafloor hydrothermal environments2008In: Geobiology, Vol. 6, p. 155-170Article in journal (Refereed)
  • 15.
    Linblom, Sten
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Ivarsson, Magnus
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Advantages of doubly polished thin sections in the study of fossilized microorganisms in volcanic rock2006In: Abstracts of EGU (European Geosciences Union) General assembly 2006, 2006Conference paper (Refereed)
  • 16.
    Neubeck, Anna
    et al.
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Ivarsson, Magnus
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Holm, Nils
    Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
    Boron influence on biochemical reactions in natural zeolites2007Conference paper (Other (popular science, discussion, etc.))
1 - 16 of 16
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