Kristofer Ivarson

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The bioconversion of waste paper to single-cell protein at pH <1 by Scytalidium acidophilum is described. Waste paper pretreated with 72% H(2)SO(4) at 4 degrees C was diluted with water to a pH of <0.1 and hydrolyzed. This yielded an adequate sugar-containing substrate for the growth of the fungus. A total of 97% of the sugars (glucose, galactose, mannose,(More)
U(IV)-ion oxidation was monitored manometrically in cell suspensions ofThiobacillus ferrooxidans. The bacteria accelerated the oxygen uptake associated with U4+-oxidation, possibly resulting from cyclic regeneration of residual amounts of ferric ion in the cell suspension. The rate of chemical oxidation in dilute sulfuric acid was not affected by addition(More)
The rhizosphere microflora of yellow birch seedlings grown in a forest soil in tanks in the greenhouse has been investigated. In general it was found that the rhizosphere effect of yellow birch roots in the A horizon was lower than that observed with cropped plants; nevertheless a stimulation of microbial development was obtained. Of the micro-organisms(More)
The possible use of particle size separation of soils in water was tested for preparing fractions rich in ‘unknown’-N, which constitutes between 41 and 46% of the total N. Ten particle size fractions ranging from <0.2 to>1,000.0 μm were separated from the A horizon of the Bainsville soil, an Orthic Humic Gleysol, and from the Bh horizon of the Armadale(More)
Changes in the carbohydrates of decomposing coniferous and deciduous litters have been followed for a period of 1200 days. Sugars and uronic acid were determined after acid hydrolysis by chromatographic and colorimetric techniques. Both litters contained the same sugars; rhamnose, ribose, xylose, arabinose, mannose, glucose, galactose, traces of fucose, and(More)
Soil bound 14C-labeled residues were released by four different physiological groups of microorganisms from an organic soil treated with 14C-ring-labeled prometryn [2-(methylthio)-4,6-bis(isopropylamino)-s-triazine]. The extent to which the different microbial populations released bound 14C residues (25-30% of the total bound 14C) from the gamma-irradiated(More)
The biodegradability of nucleic acid bases (guanine, adenine, cytosine, thymine and uracil) adsorbed on montmorillonite, illite, kaolinite, soil, gibbsite, goethite and a fulvic acid (FA)-montmorillonite complex was investigated. Each material was mixed with sand, inoculated with a soil suspension and incubated in a Warburg vessel. Lag periods in O2 uptake(More)
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