Sökning: "trophic factor"

Visar resultat 16 - 20 av 62 avhandlingar innehållade orden trophic factor.

  1. 16. Temporal and spatial variation in the community composition of lake bacterioplankton

    Författare :Eva S. Lindström; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; bacterioplankton; freshwaters; 16S rDNA; DGGE; community composition; Biologi; Biology; Biologi; limnologi; Limnology;

    Sammanfattning : Bacterioplankton are among the smallest and most abundant organisms in lake ecosystems. Due to the lack of relevant methods, the taxonomic composition of bacterioplankton has been studied less thoroughly than that of larger organisms. LÄS MER

  3. 17. JNK/c-Jun Signaling and Peripheral Nerve Regeneration

    Författare :Charlotta Lindwall; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; neuropsykologi; neurofysiologi; neurophysiology; Neurologi; neuropsychology; Neurology; Djurfysiologi; Animal physiology; JNK; signal transduction; nerve regeneration;

    Sammanfattning : The events associated with axonal injury in the peripheral nervous system (PNS) have been described in detail. However, the molecular mechanisms underlying the regenerative response, or neuronal cell death, following axonal injury are poorly understood. LÄS MER

  4. 18. Neurotrophic factors in peripheral nervous system development : function and specificity

    Författare :Anna Stenqvist Castelo-Branco; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Neurotrophic factors control a range of activities in developing neurons, including survival, proliferation, migration and neuronal differentiation. Two classes of neurotrophic factors that are strongly linked to neuronal development of the peripheral nervous system are the neurotrophins and GDNF family ligands. LÄS MER

  5. 19. Neurotrophic signalling by GDNF and its receptors

    Författare :Miles Trupp; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Many investigators have sought a polypeptide which would alleviate the neuronal loss associated with Parkinson's disease--specifically dopaminergic neurons of the ventral mesencephalon. The survival of this population of neurons has been known for some time to be promoted by soluble factors present in the conditioned media of glial cell lines. LÄS MER

  7. 20. Uptake and bioaccumulation of ionizable pharmaceuticals in aquatic organisms

    Författare :Marja L. Boström; Enhet akvatisk ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Antidepressiva medel; Avloppsvatten; BAF; BCF; Bioackumulation; Biokoncentration; Biomagnifikation; CYP; Extraktionsteknik; HF-LPME; Joniserbara läkemedel; Metabolism; pH; Riskanalys; Tolerans; Antidepressant; BAF; BCF; Bioaccumulation; Bioconcentration; Biomagnification; CYP; Extraction technique; HF-LPME; Ionizable pharmaceutical; Metabolism; pH; Risk assessment; Tolerance; Wastewater;

    Sammanfattning : Pharmaceuticals are found at low concentrations (ng/L) in aquatic environments but bioaccumulation may result in aquatic organisms reaching internal effect levels (µg/L). Environmental hazard assessments include standardized bioaccumulation tests but contrary to the model substances around which the frameworks are built most pharmaceuticals are designed to mimic endogenic chemicals, ionizable, and less lipophilic. LÄS MER