Sökning: "amphibian"

Visar resultat 1 - 5 av 24 avhandlingar innehållade ordet amphibian.

  1. 1. Risk from radionuclides: a frog's perspective : Accumulation of 137Cs in a riparian wetland, radiation doses, and effects on frogs and toads after low-dose rate exposure

    Författare :Karolina Stark; Nils Kautsky; Petra Wallberg; Torbjörn Nylén; Michael Gilek; Dennis Woodhead; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dose model; mass balance budget; overbank sedimentation; amphibian; phantom; thermoluminescence chip; radiosensitivity; DNA damage; Biology; Biologi;

    Sammanfattning : Threats from man-made radionuclides include waste issues, increasing number of power plants, underground bomb testing, nuclear weapons, and “dirty bombs”. Until recently the ionizing radiation protection system focused on protecting humans with an implied protection of biota. LÄS MER

  3. 2. Studies on cell morphogenesis during amphibian neurulation

    Författare :Jan Löfberg; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  4. 3. Physiological and Environmental Processes Influencing Growth Strategies in Amphibian Larvae

    Författare :Emma Dahl; Anssi Laurila; Felicity Huntingford; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; growth; growth strategies; amphibians; latitudinal gradient; growth hormone GH ; corticosterone CORT ; breeding phenology; compensatory growth; compensatory strategies; Biology; Biologi; Biologi med inriktning mot populationsbiologi; Biology with specialization in Population Biology;

    Sammanfattning : Cost and benefits of high individual growth rates are likely to vary across different environments leading to geographic differentiation in growth strategies. In ectotherms, habitats constrained by short growing seasons favour rapid growth and development leading to adaptive latitudinal clines in these traits. LÄS MER

  5. 4. On the determination of early cell differentiation in amphibian embryos

    Författare :Ulf Landström; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  7. 5. Mitochondrial differentiation during the early development of the amphibian embryo

    Författare :Lennart Nelson; Barbara Cannon; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Amphibia; Xenopus laevis; Ambystoma mexicanum; mitochondria; differentiation; enzymes; carriers; oxidation; development; Zoophysiology; zoofysiologi;

    Sammanfattning : Mitochondria from Xenopus laevis and Ambystoma mexica- num embryos between fertilization and the beginning of feeding were studied: the former with respect to metabolic behaviour, enzyme pattern and carrier activity, and the latter with respect to morphological parameters.The metabolic behaviour of mitochondria was studied by assessing the rates of oxygen uptake in presence of various substrates. LÄS MER