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Träfflista för sökning "WFRF:(Nilsson I N) srt2:(1980-1984)"

Sökning: WFRF:(Nilsson I N) > (1980-1984)

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1.
  • Erlinge, S, et al. (författare)
  • Predation on brown hare and ring-necked pheasant populations on southern Sweden
  • 1984
  • Ingår i: Holarctic Ecology. ; 7:3, s. 300-304
  • Tidskriftsartikel (refereegranskat)abstract
    • in an open field area in southern Sweden. Biomass and numbers of hares and pheasants eaten by the predators were calculated from data on food habits, food requirements, and numbers of the mammalian and avian predators present (11 species). At the same time estimates of numbers and production of hares and pheasants were obtained. At least 40% of the estimated annual production of hares and almost 60% of subadult-adultp heasants in autumn were consumed by the predators. Estimated numbers of hares and pheasants taken by the predators greatly exceeded shootinga nd road mortality.F oxes and cats were the predominantp reda-tors on hares( about9 0%o f total harec onsumption). Foxesa ccountedf or aboutt wo-thirds of predation on pheasants; cats and goshawks were of secondary importance. Pheasant nests were preyed upon by hooded crows and also by badgers. Hares and pheasantsc ontributedo nly about 3 and 1%, respectively,o f the food of the predators. 
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2.
  • Nilsson, I, et al. (författare)
  • Denitrification of Water Using Immobilized Pseudomonas denitrificans Cells
  • 1980
  • Ingår i: European Journal of Applied Microbiology and Biotechnology. ; 10, s. 261-274
  • Tidskriftsartikel (refereegranskat)abstract
    • Preparations of living Pseudomonas denitrificans cells immobilized in alginate gel were used in the denitrification of water. In the presence of an exogenous carbon source the entrapped microorganisms reduced nitrate and nitrite to gaseous products and to achieve complete reduction, carbon to nitrogen ratios of over two were required. The effects on denitrification of particle size and the number of bacteria in the gel were investigated. Apparent Km values for nitrate and nitrite reduction were calculated for free and immobilized cells. When the immobilized cells were incubated in nutrient media, an increase in reduction rate was observed and this was shown to be caused by the growth of cells within the gel particles. Immobilized P. denitrificans cells retained 75% of their initial nitrate reduction capacity after 21 days of storage at +4°C. The operational stability of the alginate-immobilized cells was studied both in batch and in a column which was operated continuously. A column (45 g of alginate-cell fibers in 80 ml) denitrified a high nitrate drinking water (100 mg NO3/l) with a rate of 300 ml of nitrate and nitrite free water/day/g of gel. The half life for nitrate reduction was estimated to be 30 days. 
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