Sökning: "phosphorus nitrogen"

Visar resultat 6 - 10 av 167 avhandlingar innehållade orden phosphorus nitrogen.

  1. 6. Nutrient Limitation of Bacterial Growth in Soil

    Författare :Fredrik Demoling; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ekologi; Ecology; Fertilization; Bacteria; Soil; Fungi; Thymidine or Leucine incorporation; Growth limitation; Phosphorus; Nitrogen; Carbon;

    Sammanfattning : Lack of carbon has been assumed to be the most common limiting factor for bacterial growth in soil, although there are reports of limitation by nitrogen and phosphorus. I have studied nutrient limitation of bacterial growth in soil using a novel technique, where thymidine or leucine incorporation is used to detect changes in growth rates after adding nutrients. LÄS MER

  3. 7. On the ecophysiology of Baltic cyanobacteria focusing on bottom-up factors

    Författare :Malin Mohlin; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Allelopathy; Aphanizomenon sp.; Baltic Sea; Cyanobacteria; Diazotrophic; Multi-factorial; Nitrogen; Nodularin; photosynthetic active radiation; Phosphorus; ultraviolet radiation; UV-A; UV-B;

    Sammanfattning : Cyanobacterial blooms in the Baltic Sea are dominated by diazotrophic cyanobacteria, i.e. Aphanizomenon sp. and Nodularia spumigena. LÄS MER

  4. 8. Environmental Imprint of Human Food Consumption : Linköping, Sweden 1870 - 2000

    Författare :Tina-Simone Schmid Neset; Ulrik Lohm; Susanne Kytzia; Linköpings universitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; food consumption; 19th and 20th century; Sweden; material flow analysis; MFA ; substance flow analysis; nitrogen; phosphorus; spatial imprint; lantbruk; miljöaspekter; livsmedelsindustri; livsmedelskonsumtion; markanvändning; Östergötland; 1800-talet; Food science; Livsmedelsvetenskap;

    Sammanfattning : Human food consumption has changed from the late 19th century to the turn of the millennium, and so has the need for resources to sustain this consumption. For the city of Linköping, situated in southeastern Sweden, the environmental imprint of an average inhabitant’s food consumption is studied from the year 1870 to the year 2000. LÄS MER

  5. 9. SBR-technology - use and potential applications for treatment of cold wastewater

    Författare :Stig Morling; Elzbieta Plaza; Jörgen Hanaeus; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Intermittent operation; Water temperature; nitrogen; phosphorus; SBR; reaction rates; Environmental engineering; Miljöteknik;

    Sammanfattning : Biological nutrient removal is used as an indicator of SBR performance at nine different SBRplants operated for a long period at low water temperatures (5 – 10oC). Typically needed aeratedSRT (Solids Residence Time) for complete nitrification is found to be in the range of 6 – 10 days. LÄS MER

  7. 10. The potential of wetlands for mitigation of eutrophication and brownification

    Författare :Anna Borgström; Akvatisk ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Brownification; Constructed wetlands; Cyanobacteria; Eutrophication; Filamentous algae; Green algae; Macrophytes; Multifunctionality; Nitrogen; Phosphorus; Total organic carbon; Water color;

    Sammanfattning : Increasing nutrient concentrations (eutrophication) and water color due to dissolved organic matter (brownification) pose continuous threats to freshwater ecosystems worldwide, threatening ecosystem services like drinking water supply. Changing the increasing trends of eutrophication and brownification on our aquatic ecosystems is challenging. LÄS MER