Now showing items 1-20 of 5392

    • Essential omega-3 fatty acids are depleted in sea ice and pelagic algae of the Central Arctic Ocean 

      Schmidt, Katrin; Graeve, Martin; Hoppe, Clara J. M.; Torres-Valdes, Sinhué; Welteke, Nahid; Whitmore, Laura M.; Anhaus, Philipp; Atkinson, Angus; Belt, Simon T.; Brenneis, Tina; Campbell, Robert G.; Castellani, Giulia; Copeman, Louise A.; Flores, Hauke; Fong, Allison A.; Hildebrandt, Nicole; Kohlbach, Doreen; Nielsen, Jens M.; Parrish, Christopher C.; Rad-Menéndez, Cecilia; Rokitta, Sebastian D.; Tippenhauer, Sandra; Zhuang, Yanpei (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-19)
      Microalgae are the main source of the omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), essential for the healthy development of most marine and terrestrial fauna including humans. Inverse correlations of algal EPA and DHA proportions (% of total fatty acids) with temperature have led to suggestions of a warming-induced decline in the global production of these biomolecules ...
    • On the origin of bird's nest fungi: Phylogenomic analyses of fungi in the Nidulariaceae (Agaricales, Basidiomycota) 

      Kraisitudomsook, Nattapol; Ahrendt, Steven; Riley, Robert; LaButti, Kurt; Lipzen, Anna; Daum, Chris; Barry, Kerrie; Grigoriev, Igor V.; Rämä, Teppo; Martin, Francis; Smith, Matthew E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-07)
      Nidulariaceae, also known as bird’s nest fungi, is an understudied group of mushroom-forming fungi. The common name is derived from their nest-like morphology. Bird’s nest fungi are ubiquitous wood decomposers or saprobes on dung. Recent studies showed that species in the Nidulariaceae form a monophyletic group with five sub-clades. However, phylogenetic relationships among genera and placement ...
    • Exploring the Microbial Chassis-Effect: Implications Towards Greater Biodesign 

      Chan, Dennis Tin Chat (Doctoral thesis; Doktorgradsavhandling, 2024-12-11)
      As an engineering field, the goal of synthetic biology is to design, build and implement technological solutions that advance human capability. To achieve this, synthetic biologists must be open to exploring new avenues of engineering strategies and move beyond tradition. The host-chassis has historically been an overlooked design variable in the field of synthetic biology. We show in this thesis ...
    • What Drives the Design of Startup Competitions? A Conceptual Framework and Future Directions 

      Elmi, Malek; Bertella, Giovanna; Castriotta, Manuel (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-11)
      Startup competitions serve as essential platforms where innovative solutions to grand challenges can emerge and evolve. Owing to their substantial implications, startup competitions are gaining attention in both academia and practice, but knowledge about them remains limited. This study aims to synthesize previous unconnected streams of literature on startup competitions, by exploring the key ...
    • Predicting trawl catches using environmental DNA 

      Guri, Gledis; Shelton, Andrew Olaf; Kelly, Ryan P; Yoccoz, Nigel Gilles; Johansen, Torild; Præbel, Kim; Hanebrekke, Tanja Lexau; Ray, Jessica Louise; Fall, Johanna Jennifer Elisabeth; Westgaard, Jon-Ivar (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-07)
      Quantifying the biomass, or number of individuals, diversity, and distribution of marine species is a critical aspect of understanding and managing marine ecosystems. In recent years, there has been growing interest in using environmental DNA (eDNA) for marine ecosystem management and biodiversity assessment. However, the main challenge hindering eDNA applicability has been the inability to infer ...
    • Screening for viruses using unicellular eukaryotes as hosts 

      Ricky, Zaroon (Master thesis; Mastergradsoppgave, 2023-11-15)
      This master’s project delves into the microbial diversity of the Arctic region, with focus on the isolation and characterization of a yeast of the Cystobasidium genus and likely viruses capable of infecting it. The research also shows preliminary results pointing at the movement and chemotaxis capabilities of the yeast, presenting findings that have the potential to shape our understanding of microbial ...
    • Bioprospecting of inhibitors of EPEC virulence from metabolites of marine actinobacteria from the Arctic Sea 

      Pylkkö, Tuomas; Schneider, Yannik Karl Heinz; Rämä, Teppo; Andersen, Jeanette Hammer; Tammela, Päivi (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-30)
      A considerable number of antibacterial agents are derived from bacterial metabolites. Similarly, numerous known compounds that impede bacterial virulence stem from bacterial metabolites. Enteropathogenic Escherichia coli (EPEC) is a notable human pathogen causing intestinal infections, particularly affecting infant mortality in developing regions. These infections are characterized by microvilli ...
    • Ecosystem structure and function of the North Water Polynya 

      Bryndum-Buchholz, Andrea; Herbig, Jennifer L.; Darnis, Gérald; Geoffroy, Maxime; Eddy, Tyler D. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-14)
      The North Water Polynya is one of the most productive Arctic regions on Earth, sustaining the world's northernmost Inuit communities for millennia. The polynya is a large and persistent region of open water surrounded by sea ice and exhibits high primary productivity, is a biodiversity hotspot, and is a key habitat and migration corridor for Arctic species. Many aspects of the ecosystem structure ...
    • Characterization of Monocarboxylate Transporters in the Brain of the Hooded Seal (Cystophora cristata) Reveal Possible Biochemical Adaptation to Diving 

      Jensen, Sigrid Vold (Master thesis; Mastergradsoppgave, 2024-08-29)
      Diving mammals are perpetually required to manage low-oxygen conditions throughout their lives. The mammalian brain is an organ particularly vulnerable to low oxygen levels due to its high energy demands, which require steady aerobic ATP production. The brain of the deep- diving hooded seal (Cystophora cristata) demonstrates remarkable tolerance to hypoxia. Studies suggest that this brain hypoxia ...
    • Benthic Megafauna Biodiversity Associated to Vulnerable Marine Ecosystems in Norwegian waters 

      Garcia Cambeiro, Juan Manuel (Master thesis; Mastergradsoppgave, 2024-08-15)
      The biodiversity of benthos is influenced by habitat forming taxa defining Vulnerable Marine Ecosystems (VME). Such indicator taxa are used to identify and designate VME areas, but their numerical relation to benthic biodiversity is not known. In this thesis I address the relationship between abundance of VME indicator-taxa and megabenthos biodiversity in Norwegian waters. The main objectives were ...
    • Efficient and sustainable: innovative pot design for a Mediterranean small-scale fishery 

      Virgili, Massimo; Petetta, Andrea; Herrmann, Bent; Cerbule, Kristine; Guicciardi, Stefano; Li Veli, Daniel; Barone, Giulio; Lucchetti, Alessandro (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-28)
      Pots are traditional fishing gear type largely employed in Mediterranean Small Scale Fisheries (SSFs). Their often higher species selectivity and catch quality compared to other gear types such as passive set nets or trawls are appealing characteristics for reducing the impact on benthic communities and diversifying fishing effort in the region. Despite this, in some SSFs, pots are still rarely used ...
    • The emerging picture of a diverse deep Arctic Ocean seafloor: From habitats to ecosystems 

      Ramirez-Llodra, Eva; Meyer, Heidi Kristina; Bluhm, Bodil Annikki Ulla Barbro; Brix, Saskia; Brandt, Angelika; Dannheim, Jennifer; Downey, Rachel V.; Egilsdottir, Hrönn; Eilertsen, Mari Heggernes; Gaudron, Sylvie M.; Gebruk, Anna; Golikov, Alexey V.; Hasemann, Christiane; Hilário, Ana; Jørgensen, Lis Lindal; Kaiser, Stefanie; Korfhage, Severin A.; Kürzel, Karlotta; Lörz, Anne-Nina; Buhl-Mortensen, Pål; Olafsdottir, Steinunn H.; Piepenburg, Dieter; Purser, Autun; Ribeiro, Pedro A; Sen, Arunima; Soltwedel, Thomas; Stratmann, Tanja; Steger, Jan; Svavarsson, Jörundur; Tandberg, Anne Helene S.; Taylor, James; Theising, Franziska I; Uhlir, Carolin; Waller, Rhian G.; Xavier, Joana R.; Zhulay, Irina; Saaedi, Hanieh (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-04)
      Interest in the deep Arctic Ocean is rapidly increasing from governments, policy makers, industry, researchers, and conservation groups, accentuated by the growing accessibility of this remote region by surface vessel traffic. In this review, our goal is to provide an updated taxonomic inventory of benthic taxa known to occur in the deep Arctic Ocean and relate this inventory to habitat diversity. ...
    • Benthic remineralization under future Arctic conditions and evaluating the potential for changes in carbon sequestration in warming sediments 

      Sen, Arunima; Jordà Molina, Èric; Ricardo de Freitas, Thaise; Hess, Silvia; Reiss, Henning; Bluhm, Bodil Annikki Ulla Barbro; Renaud, Paul Eric (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-07)
      Benthic (seafloor) remineralization of organic material determines the fate of carbon in the ocean and its sequestration. Bottom water temperature and labile carbon supply to the seafloor are expected to increase in a warming Arctic and correspondingly, benthic remineralization rates. We provide some of the first experimental data on the response of sediment oxygen demand (SOD), an established proxy ...
    • Characterizing humpback whale behavior along the North-Norwegian coast 

      Ytterhus Utengen, Ingvild; Vogel, Emma Frances; Biuw, Martin; Van Ruiten, Meghan; Rikardsen, Audun Håvard (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-09)
      Background - Studying movement patterns of individual animals over time can give insight into how they interact with the environment and optimize foraging strategies. Humpback whales (Megaptera novaeangliae) undertake long seasonal migrations between feeding areas in polar regions and breeding grounds in tropical areas. During the last decade, several individuals have had up to a 3-month stop-over ...
    • Integrated approach-based groundwater mapping in sohag governorate, upper Egypt, using remote sensing and aeromagnetic data 

      El-Badrawy, Hussein T.; Abbas, Abbas M.; Massoud, Usama; Abu Alam, Tamer Sabry Zaki; Alrefaee, Hamed A.; Abo Khashaba, Saif M.; Nagy, Mostafa (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-12)
      Introduction: Groundwater demand has been considerably heightened due to rapid urban growth, specifically in arid areas that rely primarily on groundwater. This study aims to utilize remote sensing and aeromagnetic data, combined with the Analytic Hierarchy Process (AHP) based GIS, to evaluate potential groundwater zones in the Sohag area, Egypt.<p> <p>Methods: Nine thematic layers, including ...
    • Testing the radiation cascade in postglacial radiations of whitefish and their parasites: founder events and host ecology drive parasite evolution 

      Brabec, Jan; Gauthier, Jérémy; Selz, Oliver M.; Knudsen, Rune; Bilat, Julia; Alvarez, Nadir; Seehausen, Ole; Feulner, Philine G. D.; Præbel, Kim; Costa, Isabel Blasco (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-19)
      Reciprocal effects of adaptive radiations on the evolution of interspecific interactions, like parasitism, remain barely explored. We test whether the recent radiations of European whitefish (Coregonus spp.) across and within perialpine and subarctic lakes promote its parasite Proteocephalus fallax (Platyhelminthes: Cestoda) to undergo host repertoire expansion via opportunity and ecological fitting, ...
    • High-Resolution Longitudinal eDNA Metabarcoding and Morphological Tracking of Planktonic Threats to Salmon Aquaculture 

      Algueró-Muñiz, María; Spatharis, Sofie; Dwyer, Toni; de Noia, Michele; Cheaib, Bachar; Liu, Yee Wan; Robertson, Brendan A.; Johnstone, Calum; Welsh, Jennifer; Macphee, Annabell; Mazurkiewicz, Marta; Bickerdike, Ralph; Migaud, Hervé; McGhee, Clara; Præbel, Kim; Llewellyn, Martin (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-30)
      Salmonid aquaculture, a major component of the Northern European, North American, and Chilean coastal economies, is under threat from challenges to gill health, many of which originate from plankton communities. A first step toward mitigating losses is to characterize the biological drivers of poor gill health. Numerous planktonic taxa have been implicated, including toxic and siliceous microalgae, ...
    • Effects of oxygen levels and temperature on growth and physiology of pikeperch juveniles cultured in a recirculating aquaculture system 

      Policar, T.; Křišťan, J.; Thorarensen, Helgi; Velíšek, J.; Kolářová, J.; Stejskal, V.; Malinovskyi, O. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-02)
      This study aimed to understand how environmental factors, specifically water temperature and oxygen saturation, affect the growth performance and physiology of pikeperch (Sander lucioperca) juveniles in recirculating aquaculture systems (RASs). Given the importance of optimising growth conditions in aquaculture to maximise efficiency, it aims to assess whether different combinations of oxygen ...
    • Integration of AI Training in the Field of Higher Education in the Republic of Bulgaria: An Overview 

      Simeonov, Svilen; Feradov, Firgan; Marinov, Angel; Abu Alam, Tamer Sabry Zaki (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-27)
      The presented work provides a comprehensive evaluation of the current availability of education programs and courses related to of AI the field of Information Technologies and Computer Science in higher education institutions (HIEs) in the Republic of Bulgaria. More specifically, this study examines 163 bachelor’s and 239 master’s degree programs from 28 HEIs available during the 2023/24 academic ...
    • Land cover succession for recently drained lakes in permafrost on the Yamal Peninsula, Western Siberia 

      Von Baeckmann, Clemens; Bartsch, Annett; Bergstedt, Helena; Efimova, Aleksandra; Widhalm, Barbara; Ehrich, Dorothee; Kumpula, Timo; Sokolov, Alexander; Abdulmanova, Svetlana (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-17)
      Drained lake basins (DLBs) are dominant features in lowland permafrost landscapes of the Arctic. Here, we present a novel approach describing and quantifying the succession progression of recently drained basins using a land cover unit retrieval scheme developed specifically for the Arctic tundra biome. The complementarity between land cover units and Normalized Difference Vegetation Index (NDVI) ...