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Visar resultat 1 - 5 av 119 avhandlingar som matchar ovanstående sökkriterier.

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. Computed Tomography of Acetabular Cup Wear and Effect of Surface Roughness on Wear and Oxidation of UHMWPE Hip Prostheses

   Författare :Anneli Jedenmalm; Ulf Gedde; André Stark; Karin Jacobson; Nicklas Axén; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hip prostheses; Computed Tomography; Surface roughness; UHMWPE; Wear; Coating; Gamma-irradiation; pin-on-disc; hip simulator; Medical engineering; Medicinsk teknik;

   Sammanfattning : Aseptic loosening is the most common complication in total hip replacement (5- 10% at 10 years follow up). The magnitude of the problem is illustrated by the fact that about one million hip prostheses are implanted worldwide each year. LÄS MER

4. 3. Quantum-confined stark effect in different quantum well structures

   Författare :Weiquan Chen; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stark effect; intersubband transition; photoluminescence; interband transitions; modulators; nonparabolicity; exciton; quantum well; oscillator strength; SEED and photodetectors;

   Sammanfattning : .... LÄS MER

5. 4. Establishment, Growth and Population Dynamics in two Mosses of Old-growth Forests

   Författare :Karin Wiklund; Håkan Rydin; Staffan Karlsson; Lloyd Stark; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Buxbaumia viridis; Neckera pennata; bryophyte; pH; phosphorus; water potential; precipitation; metapopulation; environmental stochasticity; ecology; plant; Biologi; Biology; Biologi;

   Sammanfattning : Biodiversity in forests depends on long canopy continuity and existence of different elements which function as substrates for varying organisms. Bryophytes often occupy specific substrates with a patchy distribution. LÄS MER

7. 5. Bone Development and the Nervous System

   Författare :Gregor Sisask; Olof Nilsson; Anders Bjurholm; Kenneth B Jonsson; André Stark; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Cell biology; Cellbiologi;

   Sammanfattning : Innervation of bone influence bone modeling, growth and remodeling. Pro-inflammatory cytokines released after tissue trauma are recognized as neurotrophic factors as well as factors influencing bone formation. The Wnt signaling pathway, essential for cell migration during embryogenesis is found to influence bone formation during fracture healing. LÄS MER