Publications by authors named "L Heiberg"
Phosphorus retention in lowland soils depends on redox conditions. The aim of this study was to evaluate how the Fe(III) reduction degree affects phosphate adsorption and precipitation. Two similarly P-saturated, ferric Fe-rich lowland soils, a sandy and a peat soil, were incubated under anaerobic conditions.
View Article and Find Full Text PDFArticle Synopsis
- The study investigates how phosphate (P(i)) behaves in anoxic soils compared to oxic conditions, specifically focusing on the soils' ability to trap P(i) when flooded with drainage water.
- Batch experiments showed that under anoxic conditions, there was a significant reduction of Fe(III) oxides, leading to an increase in P(i) release and higher sorption capacities in some soils at certain P(sol) concentrations.
- Despite this potential for higher P(i) retention, the results indicate that none of the studied anoxic soils could effectively hold onto P(i) at natural concentrations typically found in agricultural drainage water.
Background: The detection of small nodules in pulmonary multidetector computed tomography (MDCT) data sets is challenging, and there is a need for visualization techniques that can improve reader sensitivity and efficiency. We have developed a subvolume rendering technique ("Softslice") with nonlinear, symmetrical modulation of the relative signal intensity along the viewing direction. Our hypothesis was that this technique might provide an advantageous visual differentiation between nodules and overlapping vessels in pulmonary MDCT subvolumes.
View Article and Find Full Text PDFObjectives: To assess the relationship that shunt size, blood gases, and radiologic findings has on respiratory function in infants with univentricular heart physiology.
Setting: Cardiac catheter laboratory at Rikshospitalet University Hospital, Norway.
Patients: Fifteen infants with univentricular heart physiology admitted for cardiac catheterization.