Blar i NTNU Open på forfatter "Vadstein, Olav"
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Feeding and water temperature modulate the potential activity of gut microbiota in greater amberjack juveniles (Seriola dumerili)
Navarro-Guillén, Carmen; Degré Lorentsen, Eirik; Perera, Erick; Yúfera, Manuel; Vadstein, Olav (Peer reviewed; Journal article, 2023)Gut microbial communities are highly dynamic and respond to factors such as diet and host metabolism. However, there is limited knowledge on changes in gut microbiota during the daily cycle. To investigate how interactions ... -
Functional studies of a family of ankyrin repeat-containing proteins in the diatom Thalassiosira pseudonana hypothesized to be involved in frustule morphogenesis
Harris, Ingrid Eskerud (Master thesis, 2021)Dannelse av cellevegg hos kiselalger er et enestående eksempel på biomineralisering. Celleveggen består av detaljrike, artsspesifikke mønster av silika (SiO2), som dannes i spesifikke organeller kalt silika-deponeringsvesikler ... -
Functional studies of Group II silicanins in the diatom Thalassiosira pseudonana cell wall biomineralization
Mathivannan, Causia (Master thesis, 2022)Kiselalger er en av hovedgruppene av encellede eukaryoter i planteplanktonøkosystemet. Det er anslått at det er rundt 100 000 arter, som står for 40% av den totale primærproduksjonen. I tillegg spiller de en kritisk rolle ... -
Functional studies of two genes encoding closely related group II silicanins in the diatom Thalassiosira pseudonana
Bentzen, Kristin Leonore Lillebo (Master thesis, 2021)Kiselalger er en type encellede eukaryote alger med en stor og diversifisert gruppe, estimert til rundt 100 000 arter. De er kjent for sin evne til å lage svært komplekse strukturer som består av artsspesifikke porøse ... -
Functional studies of two silicon transporter-associated kinases in the diatom Thalassiosira pseudonana
Skisland, Maren Moen (Master thesis, 2021)Kiselalger består av en stor og mangfoldig gruppe av encellede eukaryoter. Disse organismene står for en betydelig mengde av den primære produksjonen i det marine systemet, i tillegg til at de har stor innvirkning på flere ... -
Funksjonell økologi hos pikoplankton - med fokus på bottom-up og top-down effekter
Olsen, Aina Alice (Master thesis, 2017)Et mesokosme- og et mikrokosmeforsøk ble utført over 10 og 11 dager i Patagonia, Chile. To eksperimentelle variabler ble benyttet; tetthet av kopepoder med to nivåer (lav beiting, LB og høy beiting, HB) og tilsetning av ... -
Gene regulation of carbon fixation, storage, and utilization in the diatom phaeodactylum tricornutum acclimated to light/dark cycles
Chauton, Matilde Skogen; Winge, Per; Brembu, Tore; Vadstein, Olav; Bones, Atle M. (Journal article; Peer reviewed, 2013)The regulation of carbon metabolism in the diatom Phaeodactylum tricornutum at the cell, metabolite, and gene expression levels in exponential fed-batch cultures is reported. Transcriptional profiles and cell chemistry ... -
Gut Microbiota of Migrating Wild Rabbit Fish (Siganus guttatus) Larvae Have Low Spatial and Temporal Variability
Le, Duy; Nguyen, Phuoc; Nguyen, Dung; Dierckens, Kristof; Boon, Nico; Lacoere, Tim; Kerckhof, Frederiek-Maarten; De Vrieze, Jo; Vadstein, Olav; Bossier, Peter (Peer reviewed; Journal article, 2019)We investigated the gut microbiota of rabbit fish larvae at three locations in Vietnam (ThuanAn—northern, QuangNam—intermediate, BinhDinh—southern sampling site) over a three-year period. In the wild, the first food for ... -
How the antimicrobial Protein, Lipocalin 2, affects the Establishment of Microbiota in the Gut of Mice.
Nedberg, Nora Hersoug (Master thesis, 2012)Several studies have suggested that the host genetics may influence the composition of gut microbiota, but few genes involved in host control have been proposed (Sekirov et al., 2010). Lipocalin 2 (Lcn2) prevents growth ... -
The impact of phage treatment on bacterial community structure is minor compared to antibiotics
Gundersen, Madeleine S.; Fiedler, Alexander Willi; Bakke, Ingrid; Vadstein, Olav (Peer reviewed; Journal article, 2023)Phage treatment is suggested as an alternative to antibiotics; however, there is limited knowledge of how phage treatment impacts resident bacterial community structure. When phages induce bacterial lysis, resources become ... -
Impacts of Organic Matter Removal Efficiency on the Microbial Carrying Capacity and Stability of Land-Based Recirculating Aquaculture Systems
Nesje, Jenny (Master thesis, 2018)Accumulation of organic matter and particles generated from uneaten feed and faeces is one of the major challenges in recirculating aquaculture systems (RAS), in particular colloidal and dissolved fractions as these serve ... -
Inactivation of marine heterotrophic bacteria in ballast water by an Electrochemical Advanced Oxidation Process
Moreno-Andrés, Javier; Ambauen, Noemi; Vadstein, Olav; Halle, Cynthia; Acevedo-Merino, Asunción; Nebot, Enrique; Meyn, Thomas (Journal article; Peer reviewed, 2018)Seawater treatment is increasingly required due to industrial activities that use substantial volumes of seawater in their processes. The shipping industry and the associated management of a ship's ballast water are currently ... -
Influence of nitrogen limitation on lipid accumulation and EPA and DHA content in four marine microalgae for possible use in aquafeed
Wang, Xinxin; Fosse, Hilde Karoline; Li, Keshuai; Chauton, Matilde Skogen; Vadstein, Olav; Reitan, Kjell Inge (Journal article; Peer reviewed, 2019)Microalgae are regarded as a promising alternative that can replace fishmeal and fish oil in aquaculture. Under N-limitation, many microalgae species change their carbon storage patterns in favor of neutral lipids (NLs) ... -
Influence of rate of salinity increase on nitrifying biofilms
Navada, Sharada; Vadstein, Olav; Tveten, Ann-Kristin; Verstege, Gerhardus C.; Terjesen, Bendik Fyhn; Mota, Vasco C.; Venkataraman, Vishwesh; Gaumet, Frederic; Mikkelsen, Øyvind; Kamstra, Andries (Journal article; Peer reviewed, 2019)A strategy for rapid increase in salinity with minimal impact on nitrification is important for ammonia removal from saline effluents, especially in recirculating aquaculture systems with high water reuse. To study the ... -
Integrating large-scale data for biological network construction and analysis
Pettersen, Jakob Peder (Doctoral theses at NTNU;2023:205, Doctoral thesis, 2023)Recent advances in technology has enabled scientists to extract large amounts of data from biological experiments. Due to the scale of the data, computational analyses are required in order to arrive at meaningful ... -
Investigating fluorescence in transformants expressing a silicanin-mNeonGreen fusion protein, and the effect of cytoskeleton inhibitors on frustule biosynthesis in the diatom Thalassiosira pseudonana
Gresseth, Marita (Master thesis, 2020)Kiselalger er utbredte mikroorganismer som har unike cellevegger laget av silika kalt frustuler. Disse frustulene har intrikate, artsspesifikke mønstre, og er spesielt kjente for at de har en høy spesifikk styrke. Ved å ... -
Investigating potential biotechnological uses of microalgal biomass by genetic engineering and exploiting intra-specific ecological variability
Volpe, Charlotte (Doctoral theses at NTNU;2021:246, Doctoral thesis, 2021)Even if the commercial potential of microalgae is widely recognized, industrial applications are still limited due to high production costs. For commercialization to be feasible, increasing the biological productivity of ... -
Investigating the effect of bioluminescence on Vibrio harveyi's travel time through the food chain: uptake in lumpfish via Artemia franciscana
Tsoulia, Thomais (Master thesis, 2020)The benefits of bioluminescence for bacteria in symbiotic association with a host have been well-characterized. However, the ecological importance of this natural phenomenon for free-living marine bacteria remains unclear. ... -
K-selection as microbial community management strategy: A method for improved viability of larvae in aquaculture
Vadstein, Olav; Attramadal, Kari; Bakke, Ingrid; Olsen, Yngvar (Journal article; Peer reviewed, 2018)Aquaculture has the potential to become a major food supplier in a world with an increasing human population, and increased consumption of fish will likely have positive health implications. For marine aquaculture, the ... -
Karakterisering av mikrobiota i vill torsk (Gadus morhua)
Bjørkhaug, Benedicte (Master thesis, 2012)Det har i senere tid vært en økende interesse for GI-mikrobiota i fisk, men det er fremdeles begrenset kunnskap om mikrobiotaens sammensetning og funksjon i tarmen hos vill fisk. Målet med dette prosjektet var å karakterisere ...