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Visar resultat 1 - 5 av 35 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. The effects of crayfish on interactions in freshwater benthic communities

    Författare :Per Nyström; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; exotic species; trophic cascades; omnivory; crayfish; Trophic interactions; freshwater; Hydrobiology; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi;

    Sammanfattning : This thesis examines how freshwater crayfish affect community interactions in benthic food webs. I have mainly studied the influence of the introduced signal crayfish (Pacifastacus leniusculus) on littoral communities, but also the influence of the native noble crayfish (Astacus astacus). LÄS MER

  3. 2. Att göra historia : En kritisk studie av historieämnet som kunskapsorganiserande system

    Författare :Per Nyström; Eva Hemmungs Wirtén; Birger Hjørland; Geir Vestheim.; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Classification systems; Social construction; Narratology; Historiography; Library and information science; Biblioteks- och informationsvetenskap; Biblioteks- och informationsvetenskap; Library and Information Science;

    Sammanfattning : The central theme of the present thesis is the history subject viewed as a knowledge organizing system (KOS). The history subject is studied as a class within the two universal classification systems SAB and DDC, where it is characterized by a conceptual intention and extension giving it a unique identity. LÄS MER

  4. 3. Microgels as Carriers for Antimicrobial Peptides : Surface-bound microgels, and factors affecting peptide interactions

    Författare :Lina Nyström; Martin Malmsten; Per Hansson; L. Andrew Lyon; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Antimicrobial peptides; Biomaterial coating; Drug delivery; Host defence peptides; Microgels; pH-responsive; Surface-bound; Pharmaceutical Physical Chemistry; Farmaceutisk fysikalisk kemi;

    Sammanfattning : With a growing number of multi-resistant bacteria against conventional antibiotics, there is an urgent need to identify new antimicrobial therapeutics. One example that has gained considerable interest is antimicrobial peptides (AMPs). LÄS MER

  5. 4. Stromal collagens in colorectal cancer and in colorectal liver metastases : tumour biological implications and a source for novel tumour markers

    Författare :Hanna Nyström; Malin Sund; Peter Naredi; Per Sandström; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Colorectal cancer; colorectal liver metastases; tumour marker; stroma; type IV collagen; metastatic growth pattern; kirurgi; Surgery;

    Sammanfattning : Background: Colorectal cancer (CRC) remains one of the leading causes of cancer-related mortality. About 50 % of patients with CRC will develop subsequent liver metastases (CLM). The survival for untreated CLM is only a few months and liver resection provides the only chance for a lasting cure. LÄS MER

  7. 5. Early events in disease associated protein misfolding

    Författare :Sofie Nyström; Per Hammarström; Marcus Fändrich; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Biochemistry; Biokemi;

    Sammanfattning : The scope of this thesis is to unravel some of the mysteries concerning events takingplace early in the amyloid cascade. In vitro studies of early misfolded states ofamyloidogenic proteins are important since the use of recombinant proteins allow us to monitor slight changes in environmental conditions as well as in amino acid composition and thereby illuminate the problem at near atomic resolution. LÄS MER