Sökning: "nitrogen accumulation"

Visar resultat 16 - 20 av 60 avhandlingar innehållade orden nitrogen accumulation.

  1. 16. Plant-microbe-soil interactions and soil nitrogen dynamics in boreal forests

    Författare :Robert Blasko; Sveriges lantbruksuniversitet.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Widespread nitrogen (N) limitation of plant growth in boreal forests is a well recognized phenomenon. Yet, the mechanisms responsible for the development of N limitation are unknown. By exploring the linkage between N cycling and microbial community structure, this thesis examines the role of soil microorganisms in N limitation development. LÄS MER

  2. 17. Nitrogen and phosphorus interactions and transformations in cold-climate mine water recipients

    Detta är en avhandling från Luleå tekniska universitet

    Författare :Sara Chlot; Luleå tekniska universitet.; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : Process water discharged from mine sites may contain elevated concentrations of nitrogen (N) and phosphorus (P), which both are nutrients for phytoplankton and macrophytes. Thus, discharge of nutrient rich mine water can result in algal blooms, eutrophication, oxygen deficiency and changed species composition in the recipients. LÄS MER

  3. 18. Studies of the Selective Catalytic Reduction of Nitrogen Oxides with Dimethyl Ether

    Detta är en avhandling från Luleå tekniska universitet

    Författare :Stefanie Tamm; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; gas phase reaction; isocyanate; DME; acidic zeolite; reaction mechanism; lean deNOx; NO2 formation;

    Sammanfattning : Dimethyl ether (DME) is one of the most energy-efficient and low CO2 emitting alternative fuels when produced from biomass. Similar to other vehicles with combustion engines, vehicles running on DME will most likely need after-treatment technologies for the reduction of NOx emissions to meet the most stringent upcoming legislations. LÄS MER

  4. 19. Soil tillage influences on soil mineral nitrogen and nitrate leaching in Swedish arable soils

    Detta är en avhandling från Luleå tekniska universitet

    Författare :Åsa Myrbeck; Sveriges lantbruksuniversitet.; [2014]
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Leaching of nitrogen (N) is an unwanted effect of agriculture practices which contributes to eutrophication of surface waters. This thesis examined how soil tillage practices affect leaching losses of N from arable fields. LÄS MER

  5. 20. Effects of diet intervention on body composition and ectopic fat accumulation in obese postmenopausal women

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Caroline Mellberg; Umeå universitet.; [2014]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; obesity; diet intervention; postmenopausal; ectopic fat; medicin; Medicine;

    Sammanfattning : Background Obesity is increasing worldwide and is a major contributor to morbidity and mortality. Notably, abdominal (central) obesity carries a high risk of obesity-related diseases, while peripheral fat accumulation can act in a protective manner. LÄS MER