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Träfflista för sökning "L773:0168 6496 srt2:(1995-1999)"

Sökning: L773:0168 6496 > (1995-1999)

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1.
  • Börjesson, Gunnar, et al. (författare)
  • Microbial oxidation of CH4 at high partial pressures in an organic landfill cover soil under different moisture regimes
  • 1998
  • Ingår i: FEMS Microbiology Ecology. - 0168-6496. ; 26:3, s. 207-217
  • Tidskriftsartikel (refereegranskat)abstract
    • The uptake and utilization of CH4 at high concentrations (5-18% vol.) and different soil moistures were followed for samples from a landfill cover soil with a high organic matter content. Measurements of the utilization of CH4 and O2, and production of CO2 indicated that the activity of methanotrophic organisms accounted for most of the O2 respiration. At water saturation, CH4 oxidation rates decreased with time, probably because NH4/+ accumulated. Denitrification rates, estimated based on both N2 and N2O production, were positively related to soil moisture and only slightly influenced by the extent of CH4 oxidation. Total phospholipid fatty acid concentrations increased, and concentrations of phospholipid fatty acids, typical for obligate methanotrophic bacteria (e.g. 16:1ω8 and 18:1ω8), increased in the CH4-amended samples, indicating growth of both type I and type II methanotrophs.
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2.
  • Olsson, Pål Axel, et al. (författare)
  • Interactions between ectomycorrhizal fungi and the bacterial community in soils amended with various primary minerals
  • 1998
  • Ingår i: FEMS Microbiology Ecology. - 0168-6496. ; 27:2, s. 195-205
  • Tidskriftsartikel (refereegranskat)abstract
    • The influence of ectomycorrhizal fungi on the soil bacterial community was studied by growing pine seedlings in artificial soils consisting of a peat/sand mixture amended with microcline, biotite or apatite. In the microcline-amended and unamended soils both Suillus variegatus and Paxillus involutus reduced bacterial activity as measured by thymidine incorporation. S. variegatus grew best in the biotite soil, where it increased both bacterial activity and biomass as measured by microscopic counts and specific bacterial fatty acids. Further, the positive influence of S. variegatus on the bacteria in the biotite soil modified the bacterial community, as reflected in the bacteria-specific phospholipid fatty acid composition. The increases in bacterial biomass and activity and changes in the bacterial community induced by S. variegatus may be due to the production of organic substances by this fungus, as indicated by an 10-fold increase in soil-solution citric acid. Two isolates of S. variegatus and an unidentified ectomycorrhizal fungus all tended to stimulate bacterial activity in the apatite-amended soil in compartments isolated from roots by a mesh. We conclude that the same ectomycorrhizal fungus may stimulate bacterial growth under certain conditions and inhibit bacterial growth under other conditions. Copyright (C) 1998 Federation of European Microbiological Societies.
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  • Costa, JL, et al. (författare)
  • Cyanobiont diversity within coralloid roots of selected cycad species
  • 1999
  • Ingår i: FEMS MICROBIOLOGY ECOLOGY. - : ELSEVIER SCIENCE BV. - 0168-6496. ; 28:1, s. 85-91
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The diversity and host specificity of the cyanobionts of several cycad species (Cycas circinalis L., C. rumphii Miq., Encephalartos lebomboensis I. Verd., E. villosus Lem., and Zamia pumila L.) collected in a botanical garden were examined using the tRNA(
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