Øivind Tøien

Summary

Affiliation: University of Alaska
Country: USA

Publications

  1. doi request reprint Thermoregulation and energetics in hibernating black bears: metabolic rate and the mystery of multi-day body temperature cycles
    Øivind Tøien
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, 99775 7000, USA
    J Comp Physiol B 185:447-61. 2015
  2. doi request reprint Hibernation in black bears: independence of metabolic suppression from body temperature
    Øivind Tøien
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
    Science 331:906-9. 2011
  3. doi request reprint Automated open flow respirometry in continuous and long-term measurements: design and principles
    Øivind Tøien
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775 7000, USA
    J Appl Physiol (1985) 114:1094-107. 2013
  4. pmc Modulation of gene expression in heart and liver of hibernating black bears (Ursus americanus)
    Vadim B Fedorov
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
    BMC Genomics 12:171. 2011
  5. pmc Comparative functional genomics of adaptation to muscular disuse in hibernating mammals
    Vadim B Fedorov
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA
    Mol Ecol 23:5524-37. 2014
  6. doi request reprint Data logging of body temperatures provides precise information on phenology of reproductive events in a free-living Arctic hibernator
    Cory T Williams
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
    J Comp Physiol B 181:1101-9. 2011
  7. ncbi request reprint Absence of cellular stress in brain after hypoxia induced by arousal from hibernation in Arctic ground squirrels
    Yi Long Ma
    Institute of Arctic Biology, Alaska Basic Neuroscience Program, Box 757000, 902 N Koyukuk Dr, Irving I Rm 311, University of Alaska Fairbanks, Fairbanks, AK 99775 7000, USA
    Am J Physiol Regul Integr Comp Physiol 289:R1297-306. 2005
  8. doi request reprint Energetics of arousal episodes in hibernating arctic ground squirrels
    Shawna A Karpovich
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, USA
    J Comp Physiol B 179:691-700. 2009
  9. pmc Season primes the brain in an arctic hibernator to facilitate entrance into torpor mediated by adenosine A(1) receptors
    Tulasi R Jinka
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska 99775 7000, USA
    J Neurosci 31:10752-8. 2011
  10. doi request reprint Preservation of bone mass and structure in hibernating black bears (Ursus americanus) through elevated expression of anabolic genes
    Vadim B Fedorov
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
    Funct Integr Genomics 12:357-65. 2012

Detail Information

Publications10

  1. doi request reprint Thermoregulation and energetics in hibernating black bears: metabolic rate and the mystery of multi-day body temperature cycles
    Øivind Tøien
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, 99775 7000, USA
    J Comp Physiol B 185:447-61. 2015
    ..Bears hibernating in cold conditions use more energy during hibernation than in warmer conditions. At T den below lower critical temperature, no extra energy expenditure results from T b cycling compared to keeping a stable T b. ..
  2. doi request reprint Hibernation in black bears: independence of metabolic suppression from body temperature
    Øivind Tøien
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
    Science 331:906-9. 2011
    ..The pronounced reduction and delayed recovery of metabolic rate in hibernating bears suggest that the majority of metabolic suppression during hibernation is independent of lowered body temperature...
  3. doi request reprint Automated open flow respirometry in continuous and long-term measurements: design and principles
    Øivind Tøien
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775 7000, USA
    J Appl Physiol (1985) 114:1094-107. 2013
    ....
  4. pmc Modulation of gene expression in heart and liver of hibernating black bears (Ursus americanus)
    Vadim B Fedorov
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
    BMC Genomics 12:171. 2011
    ....
  5. pmc Comparative functional genomics of adaptation to muscular disuse in hibernating mammals
    Vadim B Fedorov
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA
    Mol Ecol 23:5524-37. 2014
    ..Coordinated reduction in multiple genes involved in oxidation-reduction and glucose metabolism detected in both species is consistent with metabolic suppression and lower energy demand in skeletal muscle during inactivity of hibernation...
  6. doi request reprint Data logging of body temperatures provides precise information on phenology of reproductive events in a free-living Arctic hibernator
    Cory T Williams
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
    J Comp Physiol B 181:1101-9. 2011
    ..4 days (n = 56). T (b)-loggers represent a cost-effective and logistically feasible method to precisely investigate the phenology of reproduction and hibernation in ground squirrels...
  7. ncbi request reprint Absence of cellular stress in brain after hypoxia induced by arousal from hibernation in Arctic ground squirrels
    Yi Long Ma
    Institute of Arctic Biology, Alaska Basic Neuroscience Program, Box 757000, 902 N Koyukuk Dr, Irving I Rm 311, University of Alaska Fairbanks, Fairbanks, AK 99775 7000, USA
    Am J Physiol Regul Integr Comp Physiol 289:R1297-306. 2005
    ..These results suggest that Arctic ground squirrels experience and tolerate endogenous hypoxia during euthermy and arousal...
  8. doi request reprint Energetics of arousal episodes in hibernating arctic ground squirrels
    Shawna A Karpovich
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, USA
    J Comp Physiol B 179:691-700. 2009
    ....
  9. pmc Season primes the brain in an arctic hibernator to facilitate entrance into torpor mediated by adenosine A(1) receptors
    Tulasi R Jinka
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska 99775 7000, USA
    J Neurosci 31:10752-8. 2011
    ..These results show that metabolic suppression during torpor onset is regulated within the CNS via A(1)AR activation and requires a seasonal switch in the sensitivity of purinergic signaling...
  10. doi request reprint Preservation of bone mass and structure in hibernating black bears (Ursus americanus) through elevated expression of anabolic genes
    Vadim B Fedorov
    Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
    Funct Integr Genomics 12:357-65. 2012
    ....