Blar i Institutt for biologi på emneord "Environmental Toxicology"
Viser treff 1-15 av 15
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Acute Toxicity and Stress Gene Transcription in Two Copepod Species (Calanus finmarchicus and Calanus glacialis) Exposed to Fresh Crude Oil WSF
(Master thesis, 2011)Increasing oil activities from the gas and oil industry may constitute a hazard towards the marine environment due to potential risks for accidents, such as oil spills. This study examine acute eects on mortality (LC50) ... -
Bioaccumulation of arsenic, cadmium, mercury, lead and selenium in the benthic and pelagic food chain of Lake Baikal
(Master thesis, 2011)Increased anthropogenic release of potentially toxic trace elements such as arsenic (As), cadmium (Cd), mercury (Hg), lead (Pb) and selenium (Se) into freshwater ecosystems over the past century has caused much concern. ... -
Bioaccumulation of chemical elements in grey seals (Halichoerus grypus) from the Baltic Sea
(Master thesis, 2011)Concentrations of Ag, As, B, Ba, Bi, Ca, Cd, Ce, Co, Cs, Cu, Dy, Er, Fe, Ga, Ge, Hg, Ho, K, La, Li, Lu, Mg, Mn, Mo, Na, Nd, Ni, P, Pb, Pr, Rb, S, Sb, Se, Si, Sm, Sn, Sr, Tb, Th, Tl, V, W, Y, Yb and Zn in the livers of grey ... -
"Bottom up" ocean acidification: A study on the effects of CO2 on the bacterial community in sediments
(Master thesis, 2011). -
Comparison of the Composition of Chemical Elements in the Liver of Ringed Seal (Phoca hispida) from three different populations
(Master thesis, 2012)The ringed seal (Phoca hispida) is a circumpolar Arctic species, with several subspecies and populations. One subspecies, Phoca hispida botnica, is found in the Baltic Sea. Large ecological differences between these regions ... -
Do mercury, selenium, cadmium and zinc cause oxidative stress in common eiders (Somateria mollissima) from Svalbard?
(Master thesis, 2011)The levels of mercury have shown to increase in the Arctic environment as a cause of human activities. Few studies have examined the antioxidant system as a response to heavy metals in Arctic seabirds. Levels of the elements ... -
Effects of Ammonia and Organic Ligands to Cadmium (Cd) Toxicity on Marine Phytoplankton
(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 ... -
Effects of environmental exposure: Interplay between helix-distorting and oxidative DNA lesions and their repair
(Master thesis, 2012)DNA lesions are introduced in all living organisms every day, both via endogenous processes and by exposure to an array of DNA damaging agents. DNA lesions require repair for the sustenance of life. Base excision repair ... -
Effects of Persistent Organic Pollutants on Reproductive Hormones in Male Polar Bears (Ursus Maritimus) from Svalbard
(Master thesis, 2012)PCBs and other environmental contaminants have been found to have an effect on steroid hormones in polar bears (Ursus maritimus). The purpose of this study was to investigate the effect of persistent organic pollutants ... -
Levels and Effects of Organohalogenated Contaminants on Thyroid Hormone Levels in Glaucous Gulls (Larus hyperboreus) from Kongsfjorden, Svalbard.
(Master thesis, 2011)The glaucous gull (Larus hyperboreus) is one of the largest flying top predators in the Arctic and is exposed to rather high levels of different persistent organohalogenated contaminants (OHCs). The present study investigated ... -
Mutagenicity and induction of CYP1A- enzymes from organic extracts of soil samples from nursery schools, evaluated by in vitro studies
(Master thesis, 2011)Polluted soil can be a problem in urban areas, and can have a direct impact on human health upon exposure. The toxic potential of mixtures can be mediated by constituents and information about toxicity of mixtures is ... -
Organohalogenated Contaminants in Eggs of Snow Buntings (Plectrophenax nivalis) from Human Settlements in Svalbard
(Master thesis, 2012)Contaminants in the Arctic environment are mainly transported from lower latitude areas by atmospheric transport. However, the Russian settlements (Barentsburg and Pyramiden) in Svalbard have shown to be heavily influenced ... -
Temporal Change and Effects of Perfluoroalkyl Substanses (PFASs) on Thyroid Hormone Levels in Mother-Cub Pairs of Polar Bear (Ursus maritimus) from Svalbard in 1998 and 2008
(Master thesis, 2011)High levels of persistent organic pollutants (POPs) have been detected in the Arctic wildlife. While many of the traditional POPs have been reported to decline the last decades, emerging contaminants such as perfluoroalkyl ... -
The Effect of Persistent Organic Pollutants on Thyroid Hormone Levels in Arctic Breeding Kittiwake (Rissa tridactyla)
(Master thesis, 2011)Black-legged kittiwakes (Rissa tridactyla) breeding in the Arctic, are exposed to annual fluctuating environmental conditions. The impact of inter-year variations in environmental conditions on the blood concentrations of ... -
Thyroid hormone disruptive effects of environmental contaminants in free-ranging brown trout (Salmo trutta) from lake Mjøsa, Norway
(Master thesis, 2011)VBrown trout (Salmo trutta) from Lake Mjøsa, Norway, contain very high levels of polybrominated diphenyl ethers (PBDEs), in addition to elevated levels of other persistent organic pollutants (POPs) and trace metals, including ...