Sökning: "Phosphorus P"

Visar resultat 21 - 25 av 168 avhandlingar innehållade orden Phosphorus P.

  1. 21. Studies on nucleoside H-phosphonoselenoate chemistry and chalcogen exchange reaction between P(V) and P(III) compounds

    Författare :Martin Kullberg; Jacek Stawinski; Wojciech Markiewicz; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Phosphorus chemistry; H-phosphonate; H-phosphonoselenoate; nucleotide analogues; selenization; selenium transfer; phosphoroselenoate; Organic chemistry; Organisk kemi;

    Sammanfattning : In this thesis, the chemistry of compounds containing P-Se bonds has been studied. As a new addition to this class of compounds, H-phosphonoselenoate monoesters, have been introduced and two synthetic pathways for their preparation have been developed. LÄS MER

  3. 22. Phosphorus to horses and cows

    Författare :Gunilla Ögren; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : It is important from a nutritional perspective to meet the phosphorus (P) requirements of animals. From an environmental perspective however, it is important not to feed more P than necessary, because excessive P will mainly be excreted with feces, and the soluble P fraction is vulnerable to runoff losses and may contribute to eutrophication. LÄS MER

  4. 23. Agricultural nutrient budgets in Europe: data, methods, and indicators

    Författare :Rasmus Einarsson; Chalmers tekniska högskola; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; phosphorus; nutrient budget; EU; nutrient balance; nitrogen; Europe; indicators; environment; agriculture;

    Sammanfattning : Agricultural production systems feed humanity but also cause a range of adverse environmental effects, including climate change, loss of biodiversity, and pollution of air and water. A main cause of these effects is the emissions of nitrogen (N) and phosphorus (P) that occur as a side effect of nutrient cycling in agriculture. LÄS MER

  5. 24. The Ecophysiology of Arbuscular Mycorrhizal Fungi: Phosphatase Activity Associated with Extraradical and Intraradical Mycelium

    Författare :Ingrid van Aarle; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ekologi; Ecology; mykologi; virologi; bakteriologi; Mikrobiologi; mycology; virology; bacteriology; Microbiology; Scutellospora; polyphosphate; phosphorus uptake; phosphorus transfer; phosphatase; pH; mycelium; Glomus; fatty acid; Gigaspora; arbuscular mycorrhiza; ELF;

    Sammanfattning : Arbuscular mycorrhizal (AM) fungi colonise a wide range of plant species and are especially common in soils with a relatively high pH, where phosphorus availability is a limiting factor for primary production. The aim of this thesis was to study the ecophysiology of arbuscular mycorrhizal (AM) fungi when exposed to different environments. LÄS MER

  7. 25. Low-Coordinate Organopnictogens : Synthesis and Optoelectronic properties

    Författare :Muhammad Anwar Shameem; Andreas Orthaber; Roland Christian Fischer; Uppsala universitet; []
    Nyckelord :Pnictogen; phosphorus; arsenic; phosphaalkenes; arsaalkenes; phospholes; arsoles; alkynes; π-conjugation; PAHs; Fullerene-C60; sumanene; truxene; organic electronics;

    Sammanfattning : This thesis work is based on the development of novel organopnictogen compounds and the exploration of their potential applications in organic electronics. In particular, incorporation of phosphorus and arsenic into π-conjugated systems is known to modify the optoelectronic properties. LÄS MER