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Träfflista för sökning "WFRF:(Wahlin A) ;srt2:(2000-2004)"

Sökning: WFRF:(Wahlin A) > (2000-2004)

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  • Wahlin, A, et al. (författare)
  • Reference values for serum levels of vitamin B12 and folic acid in a population-based sample of adults between 35 and 80 years of age
  • 2002
  • Ingår i: Public health nutrition. - : Cambridge University Press (CUP). - 1368-9800 .- 1475-2727. ; 5:3, s. 505-511
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives:To examine folic acid and vitamin B12status in a group of 1000 persons sampled from the community of Umeå, Sweden, and aged 35, 40, 45, 50, 55, 60, 65, 70, 75 or 80 years. Reference data for folate and age-stratified reference data for vitamin B12are presented, together with an examination of potential confounders.Measurements:All subjects participated in extensive health examinations and interviews, and laboratory blood testing was performed.Results:A series of exclusion criteria were applied, and data from 961 subjects were analysed. Vitamin B12levels were found to decrease with increasing age, whereas folate levels remained constant across the age span studied. None of the vitamins was found to vary with sex, education, smoking or alcohol consumption, body mass index, prescription-free vitamin supplements, level of haemoglobin, or mean cell volume of erythrocytes. Further, none of these factors was associated with the age-related decrease of vitamin B12level.Conclusions:The offered reference ranges should be used only in order to rule out deficiency. For B12levels, the age of the subject should be considered such that, for elderly people in particular, values above the medians should be considered as indicative of normal vitamin status.
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  • Wahlin, Karl, et al. (författare)
  • Reduced Models of the Retention of Nitrogen in Catchments
  • 2004
  • Ingår i: Proceedings of the International Environmental Modelling and Software Society Conference (iEMSs), 14-17 June, Osnabrück, Germany. ; , s. 1081-1086
  • Konferensbidrag (refereegranskat)abstract
    • Process-oriented models of the retention of nitrogen in catchments are by necessity rather complex. We introduced several types of ensemble runs that can provide informative summaries of meteorologically normalised model outputs and also clarify the extent to which such outputs are related to various model parameters. Thereafter we employed this technique to examine policy-relevant outputs of the catchment model INCA-N. In particular, we examined how long it will take for changes in the application of fertilisers on cultivated land to affect the predicted riverine loads of nitrogen. The results showed that the magnitude of the total intervention effect was influenced mainly by the parameters governing the turnover of nitrogen in soil, whereas the temporal distribution of the water quality response was determined primarily by the hydromechanical model parameters. This raises the question of whether the soil nitrogen processes included in the model are elaborate enough to correctly explain the widespread observations of slow water quality responses to changes in agricultural practices.
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  • Resultat 31-40 av 41

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