Browsing Brage NMBU by Author "Ropstad, Erik"
Now showing items 1-20 of 115
-
A human relevant mixture of persistent organic pollutants (POPs) and perfluorooctane sulfonic acid (PFOS) differentially affect glutamate induced excitotoxic responses in chicken cerebellum granule neurons (CGNs) in vitro
Yadav, Ajay; Verhaegen, Steven; Verbruggen, Evelien; Kerhoas, Marie; Huiberts, Eva Henriëtte Willemijn; Hadera, Mussie Ghezu; Berntsen, Hanne Friis; Zimmer, Karin Elisabeth; Ropstad, Erik; Paulsen, Ragnhild Elisabeth (Peer reviewed; Journal article, 2021)Primary cultures of cerebellar granule neurons (CGNs) derived from chicken embryos were used to explore the effects on developmental neurotoxicity by a complex defined mixture of persistent organic pollutants (POPs). Its ... -
A human relevant mixture of persistent organic pollutants induces reactive oxygen species formation in isolated human leucocytes: Involvement of the β2-adrenergic receptor
Berntsen, Hanne Friis; Bodin, Johanna Eva; Øvrevik, Johan; Berntsen, Christopher Friis; Østby, Gunn Charlotte; Brinchmann, Bendik Christian; Ropstad, Erik; Myhre, Oddvar (Peer reviewed; Journal article, 2021)Exposure to chlorinated (Cl), brominated (Br) and perfluoroalkyl acid (PFAA) persistent organic pollutants (POPs) is associated with immunotoxicity and other adverse effects in humans and animals. Previous studies on POPs ... -
A mixture of Persistent Organic Pollutants (POPs) and Azoxymethane (AOM) show potential synergistic effects on intestinal tumorigenesis in the A/J Min/+ mouse model
Hansen, Kristine Eraker Aasland; Johanson, Silje Modahl; Steppeler, Christina; Sødring, Marianne Sundt; Østby, Gunn Charlotte; Berntsen, Hanne Friis; Zimmer, Karin Elisabeth; Aleksandersen, Mona; Paulsen, Jan Erik; Ropstad, Erik (Journal article; Peer reviewed, 2018) -
A mixture of Persistent Organic Pollutants (POPs) and Azoxymethane (AOM) show potential synergistic effects on intestinal tumorigenesis in the A/J Min/+ mouse model
Hansen, Kristine Eraker Aasland; Johanson, Silje Modahl; Steppeler, Christina; Sødring, Marianne Sundt; Østby, Gunn Charlotte; Berntsen, Hanne Friis; Zimmer, Karin Elisabeth; Aleksandersen, Mona; Paulsen, Jan Erik; Ropstad, Erik (Journal article; Peer reviewed, 2018) -
A mixture of persistent organic pollutants and perfluorooctanesulfonic acid induces similar behavioural responses, but different gene expression profiles in Zebrafish larvae
Khezri, Abdolrahman; Fraser, Thomas; Nourizadeh-Lillabadi, Rasoul; Kamstra, Jorke; Berg, Vidar; Zimmer, Karin Elisabeth; Ropstad, Erik (Journal article; Peer reviewed, 2017) -
A Summer Heat Wave Reduced Activity, Heart Rate, and Autumn Body Mass in a Cold-Adapted Ungulate
Trondrud, Liv Monica; Pigeon, Gabriel; Król, Elżbieta; Albon, Steve; Ropstad, Erik; Kumpula, Jouko; Evans, Alina; Speakman, John R.; Loe, Leif Egil (Peer reviewed; Journal article, 2023) -
Antler growth as a cost of reproduction in female reindeer
Loe, Leif Egil; Pigeon, Gabriel; Albon, Steve D.; Giske, Pernille Andrine Eriksdatter; Irvine, R. Justin; Ropstad, Erik; Stien, Audun; Veiberg, Vebjørn; Mysterud, Atle (Peer reviewed; Journal article, 2019)The costs of reproduction are important in shaping individual life histories, and hence population dynamics, but the mechanistic pathways of such costs are often unknown. Female reindeer have evolved antlers possibly due ... -
An Atlantic cod (Gadus morhua L.) pituitary model system for reproductive and reprotoxic testing in vitro
von Krogh, Kristine (PhD Thesis;2021:14, Doctoral thesis, 2021)Due to factors such as overfishing, climate changes and pollution, most fish stocks are in decline. This is also the case for the commercially important marine species, Atlantic cod (Gadus morhua). As a result, the last ... -
Behavioral buffering of extreme weather events in a high-Arctic herbivore
Loe, Leif Egil; Hansen, Brage Bremset; Stien, Audun; Albon, Steve D.; Bischof, Richard; Carlsson, Anja M.; Irvine, Justin; Meland, Morten; Rivrud, Inger Maren; Ropstad, Erik; Veiberg, Vebjørn; Mysterud, Atle (Journal article; Peer reviewed, 2016)As global warming advances, there is a growing concern about the impact of extreme weather events on ecosystems. In the Arctic, more frequent unseasonal warm spells and rain-on- snow events in winter cause changes in ... -
Calcium signaling as a possible mechanism behind increased locomotor response in zebrafish larvae exposed to a human relevant persistent organic pollutant mixture or PFOS
Christou, Maria; Fraser, Thomas William Kenneth; Berg, Vidar; Ropstad, Erik; Kamstra, Jorke Harmen (Peer reviewed; Journal article, 2020)Persistent organic pollutants (POPs) are widespread in the environment and their bioaccumulation can lead to adverse health effects in many organisms. Previously, using zebrafish as a model vertebrate, we found larvae ... -
Characterization and Vaccine Potential of Membrane Vesicles Produced by Francisella noatunensis subsp. orientalis in an Adult Zebrafish Model.
Lagos, Leidy; Tandberg, Julia Isabel; Repnik, Urska; Boysen, Preben; Ropstad, Erik; Varkey, Deepa Ruth; Paulsen, Ian T.; Winther-Larsen, Hanne Cecilie (Journal article; Peer reviewed, 2017) -
Characterization and Vaccine Potential of Membrane Vesicles Produced by Francisella noatunensis subsp. orientalis in an Adult Zebrafish Model.
Lagos, Leidy; Tandberg, Julia Isabel; Repnik, Urska; Boysen, Preben; Ropstad, Erik; Varkey, Deepa Ruth; Paulsen, Ian T.; Winther-Larsen, Hanne Cecilie (Journal article; Peer reviewed, 2017) -
Circadian rhythmicity persists through the Polar night and midnight sun in Svalbard reindeer
Arnold, Walter; Ruf, Thomas; Loe, Leif Egil; Irvine, R. Justin; Ropstad, Erik; Veiberg, Vebjørn; Albon, Steve D. (Journal article; Peer reviewed, 2018) -
Circadian rhythmicity persists through the Polar night and midnight sun in Svalbard reindeer
Arnold, Walter; Ruf, Thomas; Loe, Leif Egil; Irvine, R. Justin; Ropstad, Erik; Veiberg, Vebjørn; Albon, Steve D. (Journal article; Peer reviewed, 2018)Studies of locomotor activity in Svalbard reindeer reported the temporary absence of diel rhythms under Arctic photic conditions. However, using Lomb-Scargle periodogram analyses with high statistical power we found diel ... -
Cocktails of persistent organic pollutants lead to behavioural and reproductive toxicity
Khezri, Abdolrahman (PhD thesis;2017:30, Doctoral thesis, 2017)Persistent organic pollutants (POPs) are chemicals that widely distributed in the environment and biota that could cause neurobehavioural and reproductive toxicity. As humans and animals are exposed to a complex mixture ... -
Comparison of organic and conventional food and food Production. Part V: Human health – pesticide residues
Bjørge, Christine; Låg, Marit; Hetland, Ragna Bogen; Christiansen, Agnethe; Skretteberg, Lise; Andreassen, Åshild Kristine; Arukwe, Augustine; Bøe, Knut Egil; Bernhoft, Aksel; Eklo, Ole Martin; Grung, Merete; Haugen, Margaretha; Hemre, Gro Ingunn; Klingen, Ingeborg; Källqvist, Torsten; Krogdahl, Åshild; Lassen, Jørgen Fredrik; Næss, Bjørn; Ropstad, Erik; Skåre, Janneche Utne; Steffensen, Inger-Lise; Sundheim, Leif; Sverdrup, Line Emilie; Torrissen, Ole; Alexander, Jan (VKM Report, Research report, 2014) -
Comparison of young male mice of two different strains (C57BL/6J and the hybrid B6129SF1/J) in selected behavior tests. A small scale study
Hansen, Kristine Eraker Aasland; Hudecova, Alexandra Misci; Haugen, Fred; Skjerve, Eystein; Ropstad, Erik; Zimmer, Karin Elisabeth (Peer reviewed; Journal article, 2022)BACKGROUND All mouse strains are different, before choosing a strain for a large study, a small scale study should be done. In this study, we compared young males of two mouse strains, C57BL/6J and the hybrid B6129SF1/J, ... -
Congruent responses to weather variability in high arctic herbivores
Stien, Audun; Ims, Rolf Anker; Albon, Steve D.; Fuglei, Eva; Irvine, R.J.; Ropstad, Erik; Halvorsen, Odd; Langvatn, Rolf; Loe, Leif Egil; Veiberg, Vebjørn; Yoccoz, Nigel (Peer reviewed; Journal article, 2012) -
Context-dependent fitness costs of reproduction despite stable body mass costs in an Arctic herbivore
Pigeon, Gabriel; Albon, Steve; Loe, Leif Egil; Bischof, Richard; Bonenfant, Christophe; Forchhammer, Mads; Irvine, Robert Justin; Ropstad, Erik; Veiberg, Vebjørn; Stien, Audun (Peer reviewed; Journal article, 2021) -
Contrasting effects of summer and winter warming onbody mass explain population dynamics in a food-limitedArctic herbivore
Albon, Steve D.; Irvine, R. Justin; Halvorsen, Odd; Langvatn, Rolf; Loe, Leif Egil; Ropstad, Erik; Veiberg, Vebjørn; van der Wal, René; Bjørkvoll, Eirin Marie; Duff, Elizabeth I.; Hansen, Brage Bremset; Lee, Aline Magdalena; Tveraa, Torkild; Stien, Audun (Journal article; Peer reviewed, 2016)The cumulative effects of climate warming on herbivore vital rates and population dynamics are hard to predict, given that the expected effects differ between seasons. In the Arctic, warmer summers enhance plant growth ...