Browsing NTNU Open by Author "Ardelan, Murat Van"
Now showing items 1-20 of 46
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Anthropogenic impact on marine ecosystem health: A comparative multi-proxy investigation of recent sediments in coastal waters
Filipkowska, Anna; Lubecki, Ludwik; Szymczak-Żyła, Małgorzata; Ciesielski, Tomasz Maciej; Jenssen, Bjørn Munro; Ardelan, Murat Van; Mazur-Marzec, Hanna; Breedveld, Gijs D.; Oen, Amy M P; Zamojska, Anna; Kowalewska, Grażyna (Journal article; Peer reviewed, 2018)Hazardous substances entering the sea, and ultimately deposited in bottom sediments, pose a growing threat to marine ecosystems. The present study characterized two coastal areas exposed to significant anthropogenic impact ... -
Arctic Ocean’s wintertime mercury concentrations limited by seasonal loss on the shelf
Kohler, Stephen Gustav; Heimbürger-Boavida, Lars-Eric; Petrova, Mariia V.; Digernes, Maria Guadalupe; Sanchez, Nicolas; Dufour, Aurelie; Simic, Anica; Ndungu, Kuria; Ardelan, Murat Van (Peer reviewed; Journal article, 2022)High biota mercury levels are persisting in the Arctic, threatening ecosystem and human health. The Arctic Ocean receives large pulsed mercury inputs from rivers and the atmosphere. Yet the fate of those inputs and possible ... -
Assessing the impact of CaO addition to pH, alkalinity and inorganic carbon in seawater with special focus on the kinetics
Ertsås, Jostein (Master thesis, 2019)Ocean Liming, OL er en foreslått teknologi der havet får mer alkalinitet fra tilførsel av CaO. Økt alkalinitet vil forsterke havets evne til å nøytralisere syre og dermed reversere havforsuring. Alkalinitet er sterkt knyttet ... -
Biogeochemistry of iron in Patagonian fjords and waters of the Antarctic Peninsula
Puerto, Nicolas Sanchez (Doctoral theses at NTNU;2017:191, Doctoral thesis, 2017)Iron constitute an essential nutrient for marine life. Several metabolic processes in marine phytoplankton, are dependent on the presence of this trace element. Due to the chemistry of seawater, in certain marine ... -
Bruk av sporelementer som en indikator på potensielle endringer i kystvann, som følge av fiskeoppdrett.
Børset, May (Master thesis, 2014)Norge er nest størst i verden på eksport av laks som ales opp i merder langs kysten. Landet er godt egnet til denne typen oppdrett med mange fjorder, friskt vann og oppvarming fra Golfstrømmen. På grunn av den kraftige ... -
Climate change mitigation effects: How do potential CO2 leaks from a sub-seabed storage site in the Norwegian Sea affect Astarte sp. bivalves?
Bonnail, Estefanía; Borrero Santiago, Ana Rocío; Nordtug, Trond; Øverjordet, Ida Beathe; Krause, Daniel Franklin; Ardelan, Murat Van (Peer reviewed; Journal article, 2021)Carbon capture and storage (CCS) is one of the most promising mitigation strategies for reducing the emissions of carbon dioxide (CO2) to the atmosphere and may substantially help to decelerate global warming. There is an ... -
Collaborative automation and IoT technologies for coastal ocean observing systems
Mariani, Patrizio; Bachmayer, Ralf; Kosta, Sokol; Pietrosemoli, Ermanno; Ardelan, Murat Van; Connelly, Douglas P.; Delory, Eric; Pearlman, Jay S.; Petihakis, George; Thompson, Fletcher; Crise, Alessandro (Journal article; Peer reviewed, 2021) -
Determination of Al, Cr, Fe, Co and Cd in Water Samples from the Coast of Mainland Tanzania and Zanzibar
Aunet, Eva Tula Larsen (Master thesis, 2024)Sporelementer er avgjørende for livet i havet og flere biogeokjemiske prosesser i marine systemer. Nylig, rask urbanisering og industrialisering har påvirket spredningen av sporelementer i marine økosystemer betraktelig, ... -
Determination of Fe(II) and Fe(III) in Synechococcus sp. PCC 7002 culture
Villegas, Maria (Master thesis, 2018)Results presented in this thesis show Fe(II) detection in culture with goethite in addition to an increase of dFe concentration in goethite culture which have implications for a biogenic reduction mechanism in Synechococcus ... -
Distribution and Variation of the Trace Metal Iron in the Base of the Pelagic Marine Food Web: A Mesocosm Approach: Trace Metal in marine biology
Sanchez, Nicolas (Master thesis, 2012)This study was part of the WAFOW project “Can waste emission from fish farms change the structure of marine food webs?” whose objective was to perform mesocosms experiment to simulate the ammonium enriched environment, ... -
Distribution of selenium in the plume of the Gediz River, Izmir Bay, Aegean Sea
Bizsel, N.; Ardelan, Murat Van; Bizsel, Kemal C; Suzal, A; Demirdag, A.; Sarica, D.Y.; Steinnes, Eiliv (Journal article; Peer reviewed, 2017)Selenium (Se) variations in the water column, suspended particulate matter, and sediment through the salinity gradient, together with water-quality parameters, were investigated over four different river conditions: ... -
Distribution pattern of mercury in northern Barents Sea and Eurasian Basin surface sediment
Kohler, Stephen Gustav; Kull, Laura M.; Heimbürger-Boavida, Lars-Eric; Ricardo de Freitas, Thaise; Sanchez, Nicolas; Ndungu, Kuria; Ardelan, Murat Van (Peer reviewed; Journal article, 2022)Marine sediment is a significant sink for the global pollutant mercury. In a rapidly changing Arctic region, mercury (Hg) bioaccumulation in the marine ecosystem remains a prominent environmental issue. Here, we report ... -
Early Warning Signs and Dynamics of Hydrogen Sulfide Production in Recirculating Aquaculture System (RAS): with Nitrate and Iron (III) Addition
Salim, Muhammed Salih (Master thesis, 2023)Aquaculture sector is adopting more Recirculating Aquaculture System (RAS) for fish production. In Norway, RAS was earlier used only for smolt production in freshwater, but now industry is slowly shifting post-smolt ... -
Effect of hydroxamate and catecholate siderophores on iron availability in the diatom Skeletonema costatum: Implications of siderophore degradation by associated bacteria
Sanchez, Nicolas; Peterson, Claire Katja; Villa Gonzalez, Susana; Vadstein, Olav; Olsen, Yngvar; Ardelan, Murat Van (Journal article; Peer reviewed, 2019)The bioavailability of iron (Fe) across marine ecosystems, mainly determined by Fe speciation and species-specific requirements of phytoplankton, remains largely unresolved. Siderophores are relevant within the pool of ... -
Effect of Siderophore on Iron Availability in a Diatom and a Dinoflagellate Species: Contrasting Response in Associated Bacteria
Sanchez, Nicolas; Brown, Eunice Nana Adjoa; Olsen, Yngvar; Vadstein, Olav; Iriarte, Jose Luis; Gonzalez, Humberto E.; Ardelan, Murat Van (Journal article; Peer reviewed, 2018)Organic ligands play a key role controlling trace metal bioavailability in the world's oceans, yet the species-specific requirements determining whether certain iron forms can be metabolized largely remain unclear. ... -
Effects of Ammonia and Organic Ligands to Cadmium (Cd) Toxicity on Marine Phytoplankton
Liu, Xixi (Master thesis, 2012)The effects of ammonia to Cd toxicity on marine phytoplankton have been studied. The phytoplankton biomass was significantly increased at higher ammonia flux after high Cd level exposure, which indicated high ammonia ... -
Elemental Composition in various Marine Brown, Green and Red Macroalgae with respect to Season and Tissue-Age
Kleiven, Wanda (Master thesis, 2014)Macro algae are important for the ecosystem as they provide food and shelter for many organisms. Trace metal or Rare Earth Elements (REE) content of macro algae are very little understood and there is a great need for ... -
Examining Oxidized Mn and Fe as Adsorbents of Hg and Pb in Seawater: An Incubation Experiment
Gammelsæter, Erlend (Master thesis, 2023)Kunnskap om hvordan Hg og Pb sirkulerer i det marine miljøet er viktig fordi de er toksiske for marint liv. Forskning tyder på at redokssensitive elementer som Mn og Fe tar en viktig del i disse syklusene. Mn og Fe danner ... -
Experiment design and bacterial abundance control extracellular H2O2 concentrations during four series of mesocosm experiments
Hopwood, M. J.; Sanchez, Nicolas; Polyviou, Despo; Leiknes, Øystein; Gallego-Urrea, Julian Alberto; Achterberg, Eric P.; Ardelan, Murat Van; Aristegui, Javier; Bach, Lennart T.; Besiktepe, Sengul; Heriot, Yohann; Kalantzi, Ioanna; Terblylk Kurt, Tuba; Santi, Ioulia; Tsagaraki, Tatiana Margo; Turner, David (Peer reviewed; Journal article, 2020)The extracellular concentration of H2O2 in surface aquatic environments is controlled by a balance between photochemical production and the microbial synthesis of catalase and peroxidase enzymes to remove H2O2 from solution. ... -
Fe(II) stability in coastal seawater during experiments in Patagonia, Svalbard, and Gran Canaria
Hopwood, Mark J.; Santana-González, Carolina; Gallego-Urrea, Julian Alberto; Sanchez, Nicolas; Achterberg, Eric P.; Ardelan, Murat Van; Gledhill, Martha; González-Dávila, Melchor; Hoffmann, Linn; Leiknes, Øystein; Santana-Casiano, Juana Magdalena; Tsagaraki, Tatiana Margo; Turner, David (Peer reviewed; Journal article, 2020)The speciation of dissolved iron (DFe) in the ocean is widely assumed to consist almost exclusively of Fe(III)-ligand complexes. Yet in most aqueous environments a poorly defined fraction of DFe also exists as Fe(II), the ...