Sökning: "nitrogen accumulation"

Visar resultat 21 - 25 av 60 avhandlingar innehållade orden nitrogen accumulation.

  1. 21. The effect of simulated anthropogenic nitrogen deposition on the net carbon balance of boreal soils

    Författare :Nadia Maaroufi; Sveriges lantbruksuniversitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Anthropogenic activities have globally increased nitrogen (N) deposition and carbon dioxide (CO₂) gas emissions. It is proposed that anthropogenic N deposition may increase the size of boreal forest CO₂ sink, because boreal ecosystems are N limited. LÄS MER

  2. 22. Studies of hydrocarbon-assisted selective catalytic reduction of nitrogen oxides - DME as reductant and reaction mechanism over silver/alumina

    Författare :Stefanie Tamm; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ZSM-5; NCO; HC-SCR; Dimethyl ether; reaction mechanism; silver alumina;

    Sammanfattning : Increasing amounts of carbon dioxide are attaining worldwide growing attention as one probable cause for global warming. Together with the expected peak in oil production and an increasing oil demand, this results in a greater interest in more fuel effective lean burn engines (i.e. operation with excess oxygen). LÄS MER

  3. 23. Altered gene expression in the human airways during oxidative stress

    Detta är en avhandling från Stockholm : Karolinska Institutet, Institute of Enviromental Medicine

    Författare :Tiziana Dandrea; Karolinska Institutet.; Karolinska Institutet.; [2003]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Nitrogen dioxide; Ozone; Oxidative stress; Gene expression; Redox signalling; GSH; Alveolar macrophages.;

    Sammanfattning : The atmospheric accumulation of pollutant gases, such as N02 and ozone, has been associated with an increased airways hyper-reactivity within the healthy population. Moreover, those with conditions such as asthma and chronic obstructive pulmonary diseases generally experience an exacerbation of their symptoms upon exposure to these noxious gases. LÄS MER

  4. 24. Micronutrients in cereal crops

    Detta är en avhandling från Stockholm : Karolinska Institutet, Institute of Enviromental Medicine

    Författare :Karin Hamnér; Sveriges lantbruksuniversitet.; [2016]
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Seven elements essential for plants are defined as micronutrients: boron (B), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), nickel (Ni) and zinc (Zn). Deficiency of these nutrients can cause yield losses in crops and impaired crop quality. LÄS MER

  5. 25. Regional Nutrient Budgets in Forest Soils in a Policy Perspective

    Detta är en avhandling från Department of Chemical Engineering, Lund University

    Författare :Cecilia Akselsson; Lunds universitet.; Lund University.; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pedology; cartography; climatology; Fysisk geografi; geomorfologi; marklära; kartografi; klimatologi; geomorphology; Physical geography; Miljökemi; Environmental chemistry; skogsteknik; skogsbruk; Skogsvetenskap; forestry technology; forestry; Silviculture; Näringslära; Nutrition; Växtekologi; policy-making; Plant ecology; regional scale; deposition; eutrophication; carbon sequestration; acidification; Nutrient budget;

    Sammanfattning : Popular Abstract in Swedish Skogen är en av Sveriges mest betydelsefulla naturresurser. Utöver det ekonomiska värdet är skogen även viktig ur ett ekologiskt, socialt och kulturellt perspektiv. För att uppnå ett långsiktigt uthålligt skogsbruk måste alla dessa aspekter beaktas. LÄS MER