• Acyl homoserine lactone signaling in members of the Vibrionaceae family 

      Purohit, Amit (Doctoral thesis; Doktorgradsavhandling, 2013-06-13)
      Bacterial cell to cell communication, which involves regulation of gene expression in response to cell density, is defined as Quorum Sensing (QS). In QS small molecule signals are produced, which regulate their own production and are defined as auto-inducers. These signals are received by receiver proteins and in response certain genes are regulated directly or indirectly by these receiver proteins. ...
    • Advancing relativistic electronic structure methods for solids and in the time domain 

      Kadek, Marius (Doctoral thesis; Doktorgradsavhandling, 2018-08-28)
      Effects arising from the special theory of relativity significantly influence the electronic structure and properties of molecules and solid-state materials containing heavy elements. At the same time, the inclusion of the relativistic effects in theoretical and computational models increases their methodological complexity and the computational cost. In the solid state, additional challenges ...
    • Analysis and Interpretation of C-band Polarimetric SAR signatures of Sea Ice 

      Moen, Mari-Ann (Doctoral thesis; Doktorgradsavhandling, 2015-01-16)
      Operational sea ice charts are currently produced manually, an inefficient process resulting in subjective ice charts. Hence, there is a need for automating this procedure. This thesis investigates how polarimetric microwave radar signatures relate to the physical properties of sea ice, and how these signatures may contribute to the development of robust automatic algorithms. Our analyses are based ...
    • Angles as tool for grasping space. Teaching of angles based on students’ experiences with physical activities and body movement 

      Fyhn, Anne Birgitte (Doctoral thesis; Doktorgradsavhandling, 2007-06-13)
      The thesis enlightens how the choice of context as well as the approach to mathematics is important in introducing the concepts of angles. The analyses indicate that students should not be introduced to measuring angles before they are able to sort out angles according to their sizes. Angles can be introduced by use of the students’ bodies in a climbing context, where the word angle refers to ...
    • Applying Multivariate Analysis to Developing Electrodialytic Remediation of Harbour Sediments from Arctic Locations 

      Pedersen, Kristine Bondo (Doctoral thesis; Doktorgradsavhandling, 2015-03-13)
      Electrodialytic remediation (EDR) is a method for removing pollutants from different materials achieved by acidification and transport processes induced by application of an electric field of low intensity. In the thesis, EDR was shown to be a reliable technology for removal of heavy metals, PAH, PCB and TBT from harbour sediments. The final concentrations of heavy metals met the background criteria ...
    • Arctic Ocean warmings from the last glaciation to the present : implementing and assessing the reliability of planktic foraminiferal paleoreconstructions 

      Zamelczyk, Katarzyna Agnieszka (Doctoral thesis; Doktorgradsavhandling, 2012-05-11)
      The aim of the PhD study was to use planktic foraminifera to elucidate paleoceanographic variability and the preservation state of calcium carbonate in the eastern Fram Strait throughout the last 30,000 years. Sediment cores were studied using a multiproxy approach which included analyzing planktic and benthic foraminiferal fauna distribution patterns, measurements of stable isotopes (δ18O, δ13C), ...
    • Associations of pulmonary parameters with accelerometer data 

      Dias, André (Doctoral thesis; Doktorgradsavhandling, 2014-03-25)
      In Europe it is estimated that the number of elderly people aged above 65 will have doubled by 2060. In several chronic pulmonary diseases patients can suffer recurrent exacerbation episodes that can lead to severe breathing or death. In this thesis we explore the association of physical activity to lung health parameters, focusing on cystic fibrosis and chronic obstructive pulmonary disease ...
    • Automatic Inspection of Cod (Gadus Morhua L.) Fillets by Hyperspectral Imaging 

      Sivertsen, Agnar Holten (Doctoral thesis; Doktorgradsavhandling, 2011-11-11)
      The manual trimming and inspection of cod fillets by candling, is considered the bottleneck of cod fillet processing. The operation is both labour intensive and expensive, reported to account for as much as 50 % of the cost with cod fillet production. Due to the high labour costs in Norway, it is of great interest for the industry to optimize this process. In this work a hyperspectral imaging ...
    • Behavioral and energetic response of Arctic-breeding seabirds to environmental variability. 

      Welcker, Jorg (Doctoral thesis; Doktorgradsavhandling, 2009-06-16)
      Knowledge about the extent to which organisms inhabitating the Arctic are able to adjust to environmental variability is essential in order to predict the impact of future climate change. In this context, the flexibility og two Acrtic-breeding seabirds, the little Auk (Alle alle) and the kittiwake (Rissa tridactyla), in foraging behavior and energy expenditure in response to environmental variability. ...
    • Benthic communities at high-Arctic cold seeps: Faunal response to methane seepage in Svalbard 

      Åström, Emmelie (Doctoral thesis; Doktorgradsavhandling, 2018-03-20)
      Cold seeps are chemosynthetic habitats found in both deep sea and shallow ocean-shelves worldwide, including the polar regions. At seeps, hydrocarbons, sulfide, and other reduced compounds emerge from the seafloor, providing energy to fuel chemoautotrophic production. Microbial assemblages, supported by the oxidation and reduction of gases and fluids, form the base of a food web composing unique and ...
    • Benthic foraminifera as indicators of natural variability and anthropogenic impact 

      Dijkstra, Noortje (Doctoral thesis; Doktorgradsavhandling, 2013-11-28)
      Benthic foraminifera (micro-organism living on the sea-floor) were studied in the southwestern Barents Sea and Hammerfest harbor. The study focused on the response of the micro-organisms to natural and man made environmental changes. The study shows that the southwestern Barents sea is relatively clean, and the foraminifera are only impacted by natural changes. However, in the Hammerfest harbor, ...
    • Benthic foraminifera in an Arctic fjord : recent distribution and fauna of the last two millennia 

      Jernas, Patrycja Ewa (Doctoral thesis; Doktorgradsavhandling, 2012-09-13)
      The main objective of the PhD study was to improve the knowledge about the ecology of the benthic foraminiferal faunas thus increasing the precision of benthic foraminifera as indicators for modern and past Arctic fjord and shelf environments. The investigation of living (stained) benthic foraminifera assemblages in Kongsfjorden (western Svalbard) was performed on inter-annual and seasonal time ...
    • A Biofocussed Chemoprospecting Approach to Drug Discovery: Design, Synthesis and Bioactivity Screening of Diverse Biofocussed Chemical Libraries 

      Thakkar, Balmukund (Doctoral thesis; Doktorgradsavhandling, 2017-04-28)
      With pharma R & D witnessing rising cost, high attrition rates and an overall decline in productivity in recent times, newer approaches are needed for more efficient early phase drug discovery. This thesis describes a new approach, “biofocussed chemoprospecting”. The essence of the approach is to use diverse, yet “bio-like” compounds for efficient hit-finding, along with property filtering and ...
    • Biomonitoring and risk assessment tools to manage impact of diesel oil in tropical coastal habitats 

      Sardi, Adriana Eva (Doctoral thesis; Doktorgradsavhandling, 2017-05-05)
      The focus of this work is in developing biology–based tools for environmental monitoring and risk assessment associated with diesel oil contamination in tropical coastal habitats. Prediction of impacts is generally conducted via environmental monitoring, in which environmental quality over time and space is assessed by repeated observations. Prediction of risk is included within the risk ...
    • Bonding in low-coordinate complexes : what, if anything, is special? 

      Tangen, Espen (Doctoral thesis; Doktorgradsavhandling, 2008-10-14)
      To contribute to the fundamental picture of the electronic structure of low-coordinate transition metal complexes, we have carried out a series of DFT studies on mono-imido and nitrosyl complexes for different metal ions (Mn<sup>II/III</sup>, Fe<sup>II/III/IV</sup>, Co<sup>II/III</sup>) and different systems of basal ligands. These studies reveal striking similarities of the electronic structure ...
    • Calculating molecular properties in realistic environments 

      Beerepoot, Maarten T. P. (Doctoral thesis; Doktorgradsavhandling, 2016-05-13)
      This thesis focuses on how absorption properties of molecules are influenced by their environment and how this can be calculated accurately. Calculations have been performed with a polarizable embedding (PE) multiscale model. The environment is described classically by charges and electric multipoles for the permanent electrostatics and polarizabilities for polarization interactions. Density-functional ...
    • Carbon Nanotube Spectrally Selective Solar Thermal Absorbers 

      Chen, Zhonghua (Doctoral thesis; Doktorgradsavhandling, 2016-10-04)
      The main objectives of this work were to investigate a) the feasibility of depositing multi-walled carbon nanotubes (MWCNTs) homogeneously on metal substrates by electrophoresis and b) the performance of MWCNT coatings as spectrally selective absorbers. Stable aqueous MWCNT suspensions were prepared and employed in electrophoretic deposition (EPD) of MWCNT coatings on aluminum substrates. The surface ...
    • Cenozoic tectonosedimentary development and erosion estimates for the Barents Sea continental margin, Norwegian Arctic 

      Lasabuda, Amando Putra Ersaid (Doctoral thesis; Doktorgradsavhandling, 2018-04-26)
      The Barents Sea shelf has been experienced extensive uplift and erosion in the Cenozoic. However, the pre-glacial erosion has been so far less constrained in comparison to the glacial erosion. This paper aims to better understand the early–middle Cenozoic erosion in the western Barents Sea and the late Cenozoic erosion in the northern Barents Sea by using the mass-balance approach. The study utilizes ...
    • Changing circumstances : implications for trophic dynamics and species conservation in the Fennoscandian tundra 

      Henden, John-André (Doctoral thesis; Doktorgradsavhandling, 2009-03-16)
      A special case of population fluctuation is multi-annual population cycles. While such population cycles exist in several ecosystems, they are more prominent in northern (e.g.tundra) ecosystems, especially among key stone herbivore species. These herbivores providean important ecosystem function in the sense of pulsed flows of resources (i.e. for predators) and disturbances (i.e. for vegetation) ...
    • Characterization of Low Backscatter Regions in the Marine Environment by Multipolarization C- and X-band Synthetic Aperture Radar Data 

      Skrunes, Stine (Doctoral thesis; Doktorgradsavhandling, 2014-10-10)
      The focus of this thesis is the application of multipolarization SAR data for characterization of marine oil spills and other low backscatter ocean phenomena. A variety of SAR descriptors are investigated for the purpose of discriminating between oil spills and look-alikes. The effects of various parameters on the imaging, including sensor frequency, imaging geometry and oil properties, are addressed. ...