Blar i forfatter "Melum, Vebjørn Jacobsen"

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    • En hjerne for hver sesong 

      Melum, Vebjørn Jacobsen (Chronicle; Kronikk, 2020-09-19)
      Livet for oss nordboere er ganske annerledes om sommeren enn om vinteren. Lyse solfylte netter, bar hud, sterke farger og utallige lukter. Det syder av liv. I disse dager begynner intensiteten å ebbe ut. Men likefult, det bugner av overskudd. Full-ladede kropper med nullstilte hjerner som er klar for å ta fatt på et nytt skoleår/semester. I skogen bogner det av sopp og bær, på fjellet lyser det ...

    • Influence of photoperiod on central appetite regulation in captive Svalbard rock ptarmigan (Lagopus muta hyperborea) 

      Melum, Vebjørn Jacobsen (Master thesis; Mastergradsoppgave, 2018-08-09)
      The Svalbard rock ptarmigan displays a seasonal change of body mass as a selectively beneficial adaptation for survival in the high Arctic. This physiological change is sensitive to photoperiod (daylight duration in a 24h cycle) but little is known of the mechanism through which changes in photoperiod affects body mass in this species. We exposed winer adapted Sv. rock ptarmigan to a simulated ...

    • Photoperiodic induction without light-mediated circadian entrainment in a High Arctic resident bird 

      Appenroth, Daniel; Melum, Vebjørn Jacobsen; West, Alexander Christopher; Dardente, Hugues; Hazlerigg, David; Wagner, Gabriela (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-21)
      Organisms use changes in photoperiod to anticipate and exploit favourable conditions in a seasonal environment. While species living at temperate latitudes receive day length information as a year-round input, species living in the Arctic may spend as much as two-thirds of the year without experiencing dawn or dusk. This suggests that specialised mechanisms may be required to maintain seasonal ...

    • A refined method to monitor arousal from hibernation in the European hamster 

      Fasth Markussen, Fredrik Andreas; Melum, Vebjørn Jacobsen; Bothorel, Beatrice; Hazlerigg, David; Simonneaux, Valerie; Wood, Shona Hiedi (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-07)
      <i>Background</i> - Hibernation is a physiological and behavioural adaptation that permits survival during periods of reduced food availability and extreme environmental temperatures. This is achieved through cycles of metabolic depression and reduced body temperature (torpor) and rewarming (arousal). Rewarming from torpor is achieved through the activation of brown adipose tissue (BAT) associated ...

    • A refined method to monitor arousal from hibernation in the European hamster 

      Fasth Markussen, Fredrik Andreas; Melum, Vebjørn Jacobsen; Hazlerigg, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-07)
      Background - Hibernation is a physiological and behavioural adaptation that permits survival during periods of reduced food availability and extreme environmental temperatures. This is achieved through cycles of metabolic depression and reduced body temperature (torpor) and rewarming (arousal). Rewarming from torpor is achieved through the activation of brown adipose tissue (BAT) associated with a ...