phodopus

Summary

Summary: A genus of hamsters characterized by small size, very short tail, and short, broad feet with hairy soles.

Top Publications

  1. ncbi Photoperiod regulates multiple gene expression in the suprachiasmatic nuclei and pars tuberalis of the Siberian hamster (Phodopus sungorus)
    Jonathan D Johnston
    School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
    Eur J Neurosci 21:2967-74. 2005
  2. pmc Exogenous kisspeptin does not alter photoperiod-induced gonadal regression in Siberian hamsters (Phodopus sungorus)
    Timothy J Greives
    Indiana University, Department of Biology, Center for the Integrative Study of Animal Behavior and Program in Neuroscience, 1001 East 3rd Street, Bloomington, IN 47405, USA
    Gen Comp Endocrinol 156:552-8. 2008
  3. ncbi Dim nocturnal illumination alters coupling of circadian pacemakers in Siberian hamsters, Phodopus sungorus
    M R Gorman
    Department of Psychology, University of California, San Diego, La Jolla, CA 92093 0109, USA
    J Comp Physiol A Neuroethol Sens Neural Behav Physiol 190:631-9. 2004
  4. pmc Photoperiod and testosterone interact to drive seasonal changes in kisspeptin expression in Siberian hamsters (Phodopus sungorus)
    T J Greives
    Department of Biology, Program in Neuroscience and Center for the Integrative Study of Animal Behavior, Indiana University, Bloomington, IN, USA
    J Neuroendocrinol 20:1339-47. 2008
  5. ncbi Photoperiodic regulation of cellular retinol binding protein, CRBP1 [corrected] and nestin in tanycytes of the third ventricle ependymal layer of the Siberian hamster
    Perry Barrett
    Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity ACERO, Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
    J Endocrinol 191:687-98. 2006
  6. ncbi Enduring effects of photoperiod on affective behaviors in Siberian hamsters (Phodopus sungorus)
    Leah M Pyter
    Department of Neuroscience and Psychology, Ohio State University, Columbus, OH, USA
    Behav Neurosci 120:125-34. 2006
  7. doi Hypothalamic gene expression rapidly changes in response to photoperiod in juvenile Siberian hamsters (Phodopus sungorus)
    A Herwig
    Rowett Institute for Nutrition and Health, University of Aberdeen, Aberdeen, UK
    J Neuroendocrinol 24:991-8. 2012
  8. ncbi Metabolic stress suppresses humoral immune function in long-day, but not short-day, Siberian hamsters (Phodopus sungorus)
    Devin A Zysling
    Department of Biology, Center for the Integrative Study of Animal Behavior and Program in Neuroscience, Indiana University, Bloomington, IN 47405, USA
    J Comp Physiol B 177:339-47. 2007
  9. ncbi Evidence for increased nitric oxide production in the auditory brain stem of the aged dwarf hamster (Phodopus sungorus): an NADPH-diaphorase histochemical study
    S Reuss
    Department of Anatomy, School of Medicine, Johannes Gutenberg University, Mainz, Germany
    Mech Ageing Dev 112:125-34. 2000
  10. ncbi Anatomical and functional characterisation of a dopaminergic system in the suprachiasmatic nucleus of the neonatal Siberian hamster
    G E Duffield
    Department of Anatomy, University of Cambridge, United Kingdom
    J Comp Neurol 408:73-96. 1999

Research Grants

Detail Information

Publications215 found, 100 shown here

  1. ncbi Photoperiod regulates multiple gene expression in the suprachiasmatic nuclei and pars tuberalis of the Siberian hamster (Phodopus sungorus)
    Jonathan D Johnston
    School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
    Eur J Neurosci 21:2967-74. 2005
    ....
  2. pmc Exogenous kisspeptin does not alter photoperiod-induced gonadal regression in Siberian hamsters (Phodopus sungorus)
    Timothy J Greives
    Indiana University, Department of Biology, Center for the Integrative Study of Animal Behavior and Program in Neuroscience, 1001 East 3rd Street, Bloomington, IN 47405, USA
    Gen Comp Endocrinol 156:552-8. 2008
    ..results from reduced kisspeptin stimulation of the reproductive axis in seasonally breeding Siberian hamsters (Phodopus sungorus)...
  3. ncbi Dim nocturnal illumination alters coupling of circadian pacemakers in Siberian hamsters, Phodopus sungorus
    M R Gorman
    Department of Psychology, University of California, San Diego, La Jolla, CA 92093 0109, USA
    J Comp Physiol A Neuroethol Sens Neural Behav Physiol 190:631-9. 2004
    ..The two experiments demonstrate substantial efficacy of light intensities generally viewed as below the threshold of circadian systems. Light may act on oscillator coupling through rod-dependent mechanisms...
  4. pmc Photoperiod and testosterone interact to drive seasonal changes in kisspeptin expression in Siberian hamsters (Phodopus sungorus)
    T J Greives
    Department of Biology, Program in Neuroscience and Center for the Integrative Study of Animal Behavior, Indiana University, Bloomington, IN, USA
    J Neuroendocrinol 20:1339-47. 2008
    ..Collectively, these data suggest a role for both gonadal-dependent and independent (i.e. photoperiodic) mechanisms regulating seasonal changes in kisspeptin expression in Siberian hamsters...
  5. ncbi Photoperiodic regulation of cellular retinol binding protein, CRBP1 [corrected] and nestin in tanycytes of the third ventricle ependymal layer of the Siberian hamster
    Perry Barrett
    Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity ACERO, Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
    J Endocrinol 191:687-98. 2006
    ..This provides evidence that tanycytes are seasonally responsive cells and are likely to be an important part of the mechanism to facilitate seasonal physiology and behaviour in the Siberian hamster...
  6. ncbi Enduring effects of photoperiod on affective behaviors in Siberian hamsters (Phodopus sungorus)
    Leah M Pyter
    Department of Neuroscience and Psychology, Ohio State University, Columbus, OH, USA
    Behav Neurosci 120:125-34. 2006
    ..and postweaning photoperiods on subsequent affective behaviors were examined in adult Siberian hamsters (Phodopus sungorus)...
  7. doi Hypothalamic gene expression rapidly changes in response to photoperiod in juvenile Siberian hamsters (Phodopus sungorus)
    A Herwig
    Rowett Institute for Nutrition and Health, University of Aberdeen, Aberdeen, UK
    J Neuroendocrinol 24:991-8. 2012
    ....
  8. ncbi Metabolic stress suppresses humoral immune function in long-day, but not short-day, Siberian hamsters (Phodopus sungorus)
    Devin A Zysling
    Department of Biology, Center for the Integrative Study of Animal Behavior and Program in Neuroscience, Indiana University, Bloomington, IN 47405, USA
    J Comp Physiol B 177:339-47. 2007
    ..injections of the metabolic inhibitor 2-deoxy-D-glucose (2-DG) in long- and short-day housed Siberian hamsters (Phodopus sungorus) and then examined antigen-specific antibody production...
  9. ncbi Evidence for increased nitric oxide production in the auditory brain stem of the aged dwarf hamster (Phodopus sungorus): an NADPH-diaphorase histochemical study
    S Reuss
    Department of Anatomy, School of Medicine, Johannes Gutenberg University, Mainz, Germany
    Mech Ageing Dev 112:125-34. 2000
    ..to investigate the numbers of NO-producing cells in the SOC of adult and senile Djungarian dwarf hamsters (Phodopus sungorus)...
  10. ncbi Anatomical and functional characterisation of a dopaminergic system in the suprachiasmatic nucleus of the neonatal Siberian hamster
    G E Duffield
    Department of Anatomy, University of Cambridge, United Kingdom
    J Comp Neurol 408:73-96. 1999
    ....
  11. pmc Refractoriness to melatonin occurs independently at multiple brain sites in Siberian hamsters
    D A Freeman
    Department of Psychology, University of California, Berkeley, CA 94720 1650, USA
    Proc Natl Acad Sci U S A 98:6447-52. 2001
    ..Restricted, target-specific actions of Mel are consistent with the independent regulation by day length of the several behavioral and physiological traits that vary seasonally in mammals...
  12. ncbi Investigation into the regulation of the circadian system by dopamine and melatonin in the adult Siberian hamster (Phodopus sungorus)
    G E Duffield
    Department of Anatomy, University of Cambridge, UK
    J Neuroendocrinol 10:871-84. 1998
    ..studies was to investigate their role in the entrainment of the circadian system of the adult Siberian hamster (Phodopus sungorus)...
  13. pmc Reproductive responses to photoperiod persist in olfactory bulbectomized Siberian hamsters (Phodopus sungorus)
    Brian J Prendergast
    Department of Psychology, The University of Chicago, Chicago, IL 60637, USA
    Behav Brain Res 198:159-64. 2009
    ..evaluated the role of the olfactory bulbs in the photoperiodic control of reproduction in Siberian hamsters (Phodopus sungorus), an established model species for the study of neural substrates mediating seasonality...
  14. ncbi Leptin effects on immune function and energy balance are photoperiod dependent in Siberian hamsters (Phodopus sungorus)
    D L Drazen
    Department of Psychology, The Johns Hopkins University, Baltimore, Maryland 21218-2686, USA
    Endocrinology 142:2768-75. 2001
    ..interaction further, exogenous leptin was administered for 2 weeks via osmotic minipumps to Siberian hamsters (Phodopus sungorus) housed in long or short days for a total of 12 weeks...
  15. ncbi The circadian cycle of mPER clock gene products in the suprachiasmatic nucleus of the siberian hamster encodes both daily and seasonal time
    B Nuesslein-Hildesheim
    Department of Anatomy, University of Cambridge, Division of Neurobiology, Downing St, Cambridge CB2 3DY, UK
    Eur J Neurosci 12:2856-64. 2000
    ..identified clock gene products (mPER and mTIM) in the SCN of a highly seasonal mammal, the Siberian hamster (Phodopus sungorus)...
  16. ncbi Siberian hamsters free run or become arrhythmic after a phase delay of the photocycle
    N F Ruby
    Department of Biological Sciences, Stanford University, California 94305, USA
    Am J Physiol 271:R881-90. 1996
    Body temperature (Tb) and locomotor activity were recorded telemetrically from male Siberian hamsters (Phodopus sungorus sungorus) that were 3 or 12 mo of age and maintained in a light-dark (LD) cycle of 16 h light/day for 2-4 mo...
  17. doi Thermal physiology and energetics in male desert hamsters (Phodopus roborovskii) during cold acclimation
    Qing Sheng Chi
    State Key Laboratory of Integrated Management for Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
    J Comp Physiol B 181:91-103. 2011
    The adjustments in thermal physiology and energetics were investigated in male desert hamsters (Phodopus roborovskii) which were acclimated to 5°C for 4 weeks. Mean core body temperature in cold acclimated animals decreased by 0...
  18. doi Photoperiod modulates gut bacteria composition in male Siberian hamsters (Phodopus sungorus)
    Michael T Bailey
    Section of Oral Biology, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
    Brain Behav Immun 24:577-84. 2010
    ..Male Siberian hamsters (Phodopus sungorus) housed in long summer-like day lengths have significantly elevated body and fat masses compared to ..
  19. pmc MT1 melatonin receptors mediate somatic, behavioral, and reproductive neuroendocrine responses to photoperiod and melatonin in Siberian hamsters (Phodopus sungorus)
    Brian J Prendergast
    Department of Psychology and Committee on Neurobiology, Institute for Mind and Biology, University of Chicago, 940 East 57th Street, Chicago, Illinois 60637, USA
    Endocrinology 151:714-21. 2010
    ..receptors are necessary and sufficient to engage photoperiodic responses by challenging male Siberian hamsters (Phodopus sungorus), a species that does not express functional MT2 receptors, with ramelteon (RAM), a specific MT1/MT2 ..
  20. ncbi Sympathoadrenal system differentially affects photoperiodic changes in humoral immunity of Siberian hamsters (Phodopus sungorus)
    G E Demas
    Department of Biology, Indiana University, Bloomington, IN 47405 USA
    J Neuroendocrinol 14:29-35. 2002
    Siberian hamsters (Phodopus sungorus) rely on photoperiod as a primary cue to coordinate seasonally appropriate changes in physiology and behaviour...
  21. ncbi Termination of neuroendocrine refractoriness to melatonin in Siberian hamsters (Phodopus sungorus)
    A S Kauffman
    Department of Integrative Biology, University of California at Berkeley, Berkeley, CA, USA
    J Neuroendocrinol 15:191-6. 2003
    ..The breaking of refractoriness, once triggered by long-day melatonin signals, proceeds to completion only in the absence of short-day melatonin signals...
  22. pmc Establishment and persistence of photoperiodic memory in hamsters
    B J Prendergast
    Department of Psychology, University of California, Berkeley, CA 94720, USA
    Proc Natl Acad Sci U S A 97:5586-91. 2000
    ..These findings indicate that hamsters are influenced only by relatively recent day lengths and melatonin signals and ignore earlier ones that might cause them to misinterpret the salience of current day lengths...
  23. ncbi Effects of photoperiod history on immune responses to intermediate day lengths in Siberian hamsters (Phodopus sungorus)
    Brian J Prendergast
    Departments of Psychology and Neuroscience, The Ohio State University, Columbus, OH 43210, USA
    J Neuroimmunol 149:31-9. 2004
    ..Siberian hamsters (Phodopus sungorus) are long-day breeders that adjust reproductive physiology and behavior, body mass, and immune function ..
  24. ncbi Estrogen accelerates gonadal recrudescence in photo-regressed male siberian hamsters
    Toni R Pak
    Department of Environmental, Population and Organismic Biology, University of Colorado, Boulder 80309 0334, USA
    Endocrinology 143:4131-4. 2002
    ..Further, we demonstrated a novel role of E(2) in the initiation of spermatogenesis, possibly via a mechanism independent of FSH...
  25. ncbi Entrainment of 2 subjective nights by daily light:dark:light:dark cycles in 3 rodent species
    Michael R Gorman
    Departments of Psychology, University of California, San Diego, La Jolla, CA 92093 0109, USA
    J Biol Rhythms 18:502-12. 2003
    ....
  26. doi Photoperiod history differentially impacts reproduction and immune function in adult Siberian hamsters
    Brian J Prendergast
    Department of Psychology, University of Chicago, Illinois, USA
    J Biol Rhythms 24:509-22. 2009
    ..reactions [DTH]), reproductive, and adrenocortical responses were assessed in adult Siberian hamsters (Phodopus sungorus) that had been raised initially in categorically long (15-h light/day; 15L) or short (9L) photoperiods ..
  27. ncbi Melatonin induces gene-specific effects on rhythmic mRNA expression in the pars tuberalis of the Siberian hamster (Phodopus sungorus)
    Gabriela C Wagner
    School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, UK
    Eur J Neurosci 25:485-90. 2007
    ..We tested this hypothesis in the Siberian hamster (Phodopus sungorus) firstly by investigating the effects of melatonin injection, and secondly by determining whether ..
  28. ncbi Season- and gender-dependent changes in the immune function of Siberian hamsters (Phodopus sungorus)
    Joanna Pawlak
    Department of Vertebrate Physiology, Faculty of Biology, Warsaw University, Poland
    Neuro Endocrinol Lett 26:55-60. 2005
    ..Thus, the influence of photoperiod on the in vitro activity of selected immune cells from male and female hamsters challenged with peritoneal inflammation was examined...
  29. ncbi Photorefractoriness of immune function in male Siberian hamsters (Phodopus sungorus)
    B J Prendergast
    Departments of Psychology and Neuroscience, Ohio State University, Townshend Hall, Columbus, OH 43210, USA
    J Neuroendocrinol 14:318-29. 2002
    ..Together, these data indicate that, similar to the reproductive system, the immune system of male Siberian hamsters exhibits refractoriness to short days...
  30. doi Photoperiod and acute energy deficits interact on components of the thyroid hormone system in hypothalamic tanycytes of the Siberian hamster
    Annika Herwig
    Rowett Institute of Nutrition and Health, University of Aberdeen, Bucksburn, Aberdeen AB21 9SB, UK
    Am J Physiol Regul Integr Comp Physiol 296:R1307-15. 2009
    ..These data point to a mechanism whereby energy deprivation can interact with an SD photoperiod on hypothalamic tanycytes to regulate components of the thyroid hormone system involved in photoperiodic regulation of seasonal physiology...
  31. doi Short photoperiod-induced decrease of histamine H3 receptors facilitates activation of hypothalamic neurons in the Siberian hamster
    P Barrett
    Rowett Institute of Nutrition and Health, University of Aberdeen, Aberdeen AB21 9SB, United Kingdom
    Endocrinology 150:3655-63. 2009
    ..These data strongly suggest that increased activity of dmpARC neurons, as a consequence of down-regulation of the histamine H3 receptor, contributes to the physiological adaptation of body weight regulation in seasonal photoperiod...
  32. doi The role of histamine 3 receptors in the control of food intake in a seasonal model of obesity: the Siberian hamster
    Preeti H Jethwa
    School of Biomedical Sciences and Institute of Neuroscience, University of Nottingham Medical School, Queen Medical Centre, Nottingham, UK
    Behav Pharmacol 20:155-65. 2009
    ..In summary, our results suggest that increased availability of central histamine or the reduction of H3R activity decrease food intake. These effects are similar to those observed in hamsters in short photoperiods...
  33. doi Photoperiod regulates genes encoding melanocortin 3 and serotonin receptors and secretogranins in the dorsomedial posterior arcuate of the Siberian hamster
    K N Nilaweera
    University of Aberdeen, Rowett Institute of Nutrition and Health, Bucksburn, Aberdeen, UK
    J Neuroendocrinol 21:123-31. 2009
    ..These gene expression changes in dmpARC neurones may reflect the functional requirement of these neurones for seasonal physiological responses of the hamster...
  34. ncbi Photoperiod differentially regulates gene expression rhythms in the rostral and caudal SCN
    David G Hazlerigg
    Curr Biol 15:R449-50. 2005
  35. ncbi Histamine H3 receptor and orexin A expression during daily torpor in the Djungarian hamster (Phodopus sungorus)
    A Herwig
    Institute of Zoology, University of Veterinary Medicine, Hannover, Germany
    J Neuroendocrinol 19:1001-7. 2007
    ..reduced metabolism, hypothermia and suppressed central nervous system activity, whereas the Djungarian hamster (Phodopus sungorus) employs daily bouts of torpor associated with reduced body temperature and energy expenditure...
  36. doi Temporal control of spermatogenesis is independent of the central circadian pacemaker in Djungarian hamsters (Phodopus sungorus)
    Melanie Klose
    School of Engineering and Science, Jacobs University, Bremen, Germany
    Biol Reprod 84:124-9. 2011
    ..of the clock genes Arntl (previously called Bmal1) and Per1 in testes and kidneys of Djungarian hamsters (Phodopus sungorus)...
  37. ncbi Peripubertal immune challenges attenuate reproductive development in male Siberian hamsters (Phodopus sungorus)
    Brian J Prendergast
    Departments of Psychology and Neuroscience, The Ohio State University, Columbus, Ohio 43210, USA
    Biol Reprod 70:813-20. 2004
    ..The data also underscore the importance of seasonally dependent life history factors in assessing physiological tradeoffs...
  38. pmc Hypothalamic gene expression in reproductively photoresponsive and photorefractory Siberian hamsters
    Brian J Prendergast
    Departments of Psychology and Neuroscience, and Biochemistry and Medical Biochemistry and Neurobiotechnology Center, Ohio State University, Columbus, OH 43210, USA
    Proc Natl Acad Sci U S A 99:16291-6. 2002
    ....
  39. ncbi Spontaneous extraskeletal osteosarcomas of the subcutis in Djungarian hamsters (Phodopus sungorus): report of two cases
    H Madarame
    Veterinary Teaching Hospital, School of Veterinary Medicine, Azabu University, Sagamihara shi, Kanagawa ken 229 8501, Japan
    J Vet Med A Physiol Pathol Clin Med 51:232-6. 2004
    ..No abnormality was observed in any skeletal bones and no change suggesting tumorous growth was observed in any other sites. This is the first report of extraskeletal osteosarcomas in Djungarian hamsters...
  40. ncbi Hypothalamic expression of thyroid hormone-activating and -inactivating enzyme genes in relation to photorefractoriness in birds and mammals
    Tsuyoshi Watanabe
    Division of Biomodeling, Graduate School of Bioagricultural Sciences and Institute for Advanced Research, Nagoya University, Furo cho, Chikusa ku, Nagoya 464 8601, Japan
    Am J Physiol Regul Integr Comp Physiol 292:R568-72. 2007
    ..These gene changes may be involved in the regulation of photorefractoriness, as well as photoinduction...
  41. doi In vivo but not in vitro leptin enhances lymphocyte proliferation in Siberian hamsters (Phodopus sungorus)
    Gregory E Demas
    Department of Biology, Program in Neuroscience and the Center for the Integrative Study of Animal Behavior, Indiana University, 1001 E 3rd Street, Bloomington, IN 47405, USA
    Gen Comp Endocrinol 166:314-9. 2010
    ..moderate reduction in energy stores by partial surgical lipectomy impairs humoral immunity of Siberian hamsters (Phodopus sungorus) and is mediated, in part, by changes in the adipose tissue hormone leptin...
  42. ncbi Chemosensory stimulation of luteinizing hormone secretion in male Siberian hamsters (Phodopus sungorus)
    Sonali Anand
    Department of Neurobiology and Physiology, Northwestern University, Evanston, Illinois 60208, USA
    Biol Reprod 70:1033-40. 2004
    Male Siberian hamsters (Phodopus sungorus) housed in long days (LD), but not short days (SD) release luteinizing hormone (LH) when exposed to females...
  43. pmc Seasonal pelage changes are synchronized by simulated natural photoperiods in Siberian hamsters (Phodopus sungorus)
    Matthew P Butler
    Department of Integrative Biology, University of California, Berkeley, California, USA
    J Exp Zool A Ecol Genet Physiol 311:475-82. 2009
    ..lengths (DLs) synchronize the seasonal molt was assessed in nine cohorts of male and female Siberian hamsters (Phodopus sungorus) born into a simulated natural photoperiod (SNP) beginning 4 weeks before and ending 12 weeks after the ..
  44. ncbi Short-day increases in aggression are independent of circulating gonadal steroids in female Siberian hamsters (Phodopus sungorus)
    Melissa Ann L Scotti
    Department of Biology, Center for Integrative Study of Animal Behavior and Program in Neuroscience, Indiana University, Bloomington, IN 47405, USA
    Horm Behav 52:183-90. 2007
    ..Virtually nothing is known, however, regarding seasonal aggression in female Siberian hamsters (Phodopus sungorus)...
  45. pmc Differential ovarian expression of KiSS-1 and GPR-54 during the estrous cycle and photoperiod induced recrudescence in Siberian hamsters (Phodopus sungorus)
    Asha Shahed
    Department of Biological Sciences, California State University Long Beach, Long Beach, California 90840 3702, USA
    Mol Reprod Dev 76:444-52. 2009
    ..This study examined the expression of KiSS-1/GPR54 mRNA and protein in ovaries of Siberian hamsters (Phodopus sungorus)...
  46. doi The role of androgens in the mediation of seasonal territorial aggression in male Siberian hamsters (Phodopus sungorus)
    Melissa Ann L Scotti
    Department of Biology, Center for the Integrative Study of Animal Behavior and Program in Neuroscience, Indiana University, Bloomington, IN 47405, USA
    Physiol Behav 95:633-40. 2008
    ..Siberian hamsters (Phodopus sungorus) are an ideal study system because they display increased territorial aggression during the non-breeding ..
  47. pmc Short photoperiod-induced ovarian regression is mediated by apoptosis in Siberian hamsters (Phodopus sungorus)
    C S Moffatt-Blue
    Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90840, USA
    Reproduction 131:771-82. 2006
    ..These data indicate that SD exposure rapidly induces follicular apoptosis in Siberian hamsters, which ultimately disrupts both estradiol secretion and folliculogenesis, resulting in the seasonal loss of ovarian function...
  48. pmc Differential expression of matrix metalloproteinases during stimulated ovarian recrudescence in Siberian hamsters (Phodopus sungorus)
    Trevor J Salverson
    Reproductive Biology Laboratory, Department of Biological Sciences, California State University, Long Beach, CA 90840, USA
    Gen Comp Endocrinol 155:749-61. 2008
    ..Because of the variation observed in expression patterns, MMPs and TIMPs may be differentially involved with photostimulated return to ovarian function...
  49. ncbi Affective responses to changes in day length in Siberian hamsters (Phodopus sungorus)
    Brian J Prendergast
    Department of Psychology, University of Chicago, Chicago, IL 60637, USA
    Psychoneuroendocrinology 30:438-52. 2005
    ..Male and female Siberian hamsters (Phodopus sungorus) were exposed to long (16 h light/day; LD) or short (8 h light/day; SD) photoperiods beginning at the ..
  50. ncbi VGF-derived peptide, TLQP-21, regulates food intake and body weight in Siberian hamsters
    Preeti H Jethwa
    School of Biomedical Sciences and Institute of Neuroscience, University of Nottingham Medical School, Queen s Medical Centre, Nottingham NG7 2UH, United Kingdom
    Endocrinology 148:4044-55. 2007
    ..The effects of TLQP-21 administration are similar to those in hamsters in short days, suggesting that increased VGF activity may contribute to the hypophagia that underlies the seasonal catabolic state...
  51. pmc Chicken ovalbumin upstream promoter transcription factor II regulates uncoupling protein 3 gene transcription in Phodopus sungorus
    Tobias Fromme
    Department of Animal Physiology, Faculty of Biology, Philipps University, D 35043 Marburg, Germany
    BMC Mol Biol 8:1. 2007
    ..In this study we in silico analyzed the upstream region of Ucp3 of the Djungarian hamster Phodopus sungorus and identified several putative response elements for Coup-TFII...
  52. ncbi Absence of UCP3 in brown adipose tissue does not impair nonshivering thermogenesis
    Michaela Liebig
    Animal Physiology, Department of Biology, Philipps University Marburg, D 35032 Marburg, Germany
    Physiol Biochem Zool 77:116-26. 2004
    ....
  53. ncbi Adult sertoli cells are not terminally differentiated in the Djungarian hamster: effect of FSH on proliferation and junction protein organization
    Gerard A Tarulli
    Prince Henry s Institute of Medical Research, Clayton Victoria, 3168, Australia
    Biol Reprod 74:798-806. 2006
    ..by hormones after puberty in mammals, although recent data using the seasonal breeding adult Djungarian hamster (Phodopus sungorus) model challenged this assertion by demonstrating a decrease in Sertoli cell number after gonadotropin ..
  54. ncbi PC1/3 and PC2 gene expression and post-translational endoproteolytic pro-opiomelanocortin processing is regulated by photoperiod in the seasonal Siberian hamster (Phodopus sungorus)
    M Helwig
    Molecular Endocrinology Group, Division of Obesity and Metabolic Health, Rowett Research Institute, Aberdeen Centre for Energy Regulation and Obesity, Aberdeen, UK
    J Neuroendocrinol 18:413-25. 2006
    A remarkable feature of the seasonal adaptation displayed by the Siberian hamster (Phodopus sungorus) is the ability to decrease food intake and body weight (by up to 40%) in response to shortening photoperiod...
  55. ncbi Follicle-stimulating hormone regulates both Sertoli cell and spermatogonial populations in the adult photoinhibited Djungarian hamster testis
    Sarah J Meachem
    Prince Henry s Institute of Medical Research, Clayton, Victoria 3168, Australia
    Biol Reprod 72:1187-93. 2005
    ..This naturally occurring model provides a unique opportunity to understand the mechanisms (apoptotic and/or proliferative) by which FSH regulates Sertoli and germ cell development in the adult animal...
  56. ncbi Splenic denervation blocks leptin-induced enhancement of humoral immunity in Siberian hamsters (Phodopus sungorus)
    Gregory E Demas
    Department of Biology, Program in Neural Science, and Center for the Integrative Study of Animal Behavior, Indiana University, Bloomington, Ind 47405, USA
    Neuroendocrinology 76:178-84. 2002
    ....
  57. ncbi Orexin A-like immunoreactivity in the hypothalamus and thalamus of the Syrian hamster (Mesocricetus auratus) and Siberian hamster (Phodopus sungorus), with special reference to circadian structures
    P A McGranaghan
    School of Biological Sciences, University of Manchester, 3.614 Stopford Building, Oxford Road, M13 9PT, Manchester, UK
    Brain Res 904:234-44. 2001
    ..The presence of orexin A-immunoreactive fibres in the neural architecture of the mammalian circadian system suggests an important role for orexin A in circadian timekeeping processes...
  58. ncbi Sleep and cortical temperature in the Djungarian hamster under baseline conditions and after sleep deprivation
    T Deboer
    , , Switzerland
    J Comp Physiol A 174:145-55. 1994
    The Djungarian hamster (Phodopus sungorus) is a markedly photoperiodic rodent which exhibits daily torpor under short photoperiod. Normative data were obtained on vigilance states, electroencephalogram (EEG) power spectra (0.25-25...
  59. ncbi A test of the coincidence and duration models of melatonin action in Siberian hamsters: the effects of 1-hr melatonin infusions on testicular development in intact and pinealectomized prepubertal Phodopus sungorus
    B Gunduz
    Department of Biology, University of Delaware, Newark 19716, USA
    J Pineal Res 30:97-107. 2001
    ..daily infusions of 10, 25, and 50 ng of melatonin in pinealectomized intact and prepubertal Siberian hamsters (Phodopus sungorus)...
  60. ncbi Energy intake and fur in summer- and winter-acclimated Siberian hamsters (Phodopus sungorus)
    A S Kauffman
    Department of Integrative Biology, University of California, 3060 Valley Life Science Building, Berkeley, CA 94720, USA
    Am J Physiol Regul Integr Comp Physiol 281:R519-27. 2001
    ..The daily food intake of Siberian hamsters (Phodopus sungorus) was measured under simulated summer and winter conditions in intact animals and those with varying ..
  61. ncbi A test of the coincidence and duration models of melatonin action in Siberian hamsters. II. The effects of 4- and 8-hr melatonin infusions on testicular development of pinealectomized juvenile Siberian hamsters (Phodopus sungorus)
    B Gunduz
    Department of Biological Sciences, University of Delaware, Newark 19716, USA
    J Pineal Res 30:56-64. 2001
    ..The duration of the melatonin signal alone can not explain the results...
  62. ncbi Testosterone and estrogen act via different pathways to inhibit puberty in the male Siberian hamster (Phodopus sungorus)
    T R Pak
    Department of Environmental, Population and Organismic Biology, University of Colorado, Boulder, Colorado 80309, USA
    Endocrinology 142:3309-16. 2001
    ..5 +/- 0.98 ng/ml) yet significantly lower pituitary FSH concentration (0.09 +/- 0.04 ng/microg protein). These results showed that the pathways of T and E2 action on the hypothalamo-pituitary-gonadal axis are distinct...
  63. ncbi Effects of 60 Hz magnetic field exposure on the pineal and hypothalamic-pituitary-gonadal axis in the Siberian hamster (Phodopus sungorus)
    B W Wilson
    Pacific Northwest National Laboratory, Richland, Washington 99352, USA
    Bioelectromagnetics 20:224-32. 1999
    Experiments using the dwarf Siberian hamster Phodopus sungorus were carried out to determine possible neuroendocrine consequences of one-time and repeated exposures to 60 Hz magnetic fields (MF)...
  64. ncbi Photoperiodic regulation of gene expression in brown and white adipose tissue of Siberian hamsters (Phodopus sungorus)
    Gregory E Demas
    Center for Behavioral Neuroscience, Department of Biology, Georgia State University, Atlanta, Georgia 30303 3083, USA
    Am J Physiol Regul Integr Comp Physiol 282:R114-21. 2002
    ..Thus the SD-induced decreased adiposity of Siberian hamsters may be due to a coordinated suite of WAT and BAT gene transcription changes ultimately increasing lipid mobilization and utilization...
  65. ncbi Tissue-specific expression and cold-induced mRNA levels of uncoupling proteins in the Djungarian hamster
    C von Praun
    Philipps University, Department of Biology/Animal Physiology, Karl-von-Frisch-Strasse, 35032 Marburg, Germany
    Physiol Biochem Zool 74:203-11. 2001
    ..In skeletal muscle, UCP2 and UCP3 mRNA levels were not altered. Cold-induced changes of serum FFA levels correlated with the stimulation of UCP1 mRNA in BAT but not with UCP2 and UCP3...
  66. ncbi Circulating ghrelin levels and central ghrelin receptor expression are elevated in response to food deprivation in a seasonal mammal (Phodopus sungorus)
    A Tups
    Division of Energy Balance and Obesity, Rowett Research Institute, Aberdeen Centre for Energy Regulation and Obesity ACERO, Aberdeen, UK
    J Neuroendocrinol 16:922-8. 2004
    ..deprivation (48 h) in the hypothalamic arcuate nucleus and ventromedial nucleus of the seasonal Siberian hamster, Phodopus sungorus. This increase is accompanied by a two-fold elevation of circulating ghrelin concentration...
  67. ncbi Neuronal distribution of melanin-concentrating hormone, cocaine- and amphetamine-regulated transcript and orexin B in the brain of the Djungarian hamster (Phodopus sungorus)
    Reza M H Khorooshi
    Department of Animal Physiology, Biology Faculty, Philipps University Marburg, Karl von Frisch Street 8, 35032 Marburg, Germany
    J Chem Neuroanat 29:137-48. 2005
    ..the neuroendocrine pathways controlling energy balance and circadian rhythmicity in the Djungarian hamster (Phodopus sungorus) were studied...
  68. ncbi Cografting of hamster (Phodopus sungorus) and marmoset (Callithrix jacchus) testicular tissues into nude mice does not overcome blockade of early spermatogenic differentiation in primate grafts
    Joachim Wistuba
    Institute of Reproductive Medicine, University Munster, 48129 Munster, Germany
    Biol Reprod 71:2087-91. 2004
    ..Our results indicate that the conditions needed for initiation of spermatogenesis in the marmoset are remarkably different from those present in most other mammals...
  69. ncbi Shortening of the photoperiod affects sleep distribution, EEG and cortical temperature in the Djungarian hamster
    T Deboer
    Institute of Pharmacology, , Switzerland
    J Comp Physiol A 179:483-92. 1996
    ..were continuously recorded for two baseline days and after 4 h sleep deprivation in Djungarian hamsters (Phodopus sungorus) adapted to a short photoperiod (light dark 8:16)...
  70. ncbi Pattern of change in melatonin duration determines testicular responses in Siberian hamsters, Phodopus sungorus
    M R Gorman
    Department of Psychology, University of California, Berkeley 94720, USA
    Biol Reprod 56:668-73. 1997
    ..The pattern of change in MEL secretion, as well as absolute duration of the MEL signal, is important for implementing seasonal cycles of reproduction...
  71. ncbi Differential alteration of the reproductive axis by testosterone and estrogen in peripubertal and adult male Siberian hamsters (Phodopus sungorus)
    Toni R Pak
    Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder, Colorado 80309, USA
    Biol Reprod 67:706-11. 2002
    ....
  72. ncbi Testicular recrudescence in intermediate day lengths reflects loss of photoperiodic memory in Siberian hamsters
    Alexander S Kauffman
    Department of Integrative Biology, University of California, Berkeley 94720, USA
    J Biol Rhythms 17:345-52. 2002
    ....
  73. ncbi Aging, reproduction, and the melatonin rhythm in the Siberian hamster
    T H Horton
    Department of Neurobiology and Physiology, Northwestern University, Evanston, IL 60208, USA
    J Biol Rhythms 16:243-53. 2001
    ..In the wild, failure to undergo testicular regression in the presence of shortening day lengths may extend the breeding season of aged males...
  74. ncbi Selective sleep deprivation after daily torpor in the Djungarian hamster
    Svitlana Palchykova
    Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland
    J Sleep Res 11:313-9. 2002
    ..The frontal predominance of slow waves encountered both after torpor and SD indicates that waking and torpor induce similar regional changes in EEG SWA...
  75. pmc Pubertal growth of the medial amygdala delayed by short photoperiods in the Siberian hamster, Phodopus sungorus
    Bradley M Cooke
    Department of Neurobiology and Physiology, Northwestern University, Evanston, IL 60208, USA
    Horm Behav 52:283-8. 2007
    ..puberty influences the morphology of the medial nucleus of the amygdala (MeA) by comparing Siberian hamsters (Phodopus sungorus) that had been raised from birth in either long day (LD; 16:8 h light:dark) or short day (SD; 8:16) ..
  76. ncbi Photoperiod alters hypothalamic cytokine gene expression and sickness responses following immune challenge in female Siberian hamsters (Phodopus sungorus)
    L M Pyter
    Department of Neuroscience, Institute of Behavioral Medicine Research, 48A Townshend Hall, Ohio State University, Columbus, OH 43210, USA
    Neuroscience 131:779-84. 2005
    ..These data suggest that differences in cytokine production in the hypothalamus may underlie the photoperiod-induced differences in sickness responses, and that these changes are not mediated by estradiol...
  77. ncbi Time course and role of the pineal gland in photoperiod control of innate immune cell functions in male Siberian hamsters
    Steven M Yellon
    Center for Perinatal Biology Research, Department of Physiology, School of Medicine, Loma Linda University Adventist Health Sciences Center, Loma Linda, CA, USA
    J Neuroimmunol 161:137-44. 2005
    ..The findings suggest that photoperiod and pineal gland function may regulate certain innate immune activities...
  78. ncbi Perinatal photoperiod organizes adult immune responses in Siberian hamsters (Phodopus sungorus)
    Zachary M Weil
    Department of Neuroscience, and Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH 43210, USA
    Am J Physiol Regul Integr Comp Physiol 290:R1714-9. 2006
    ..Siberian hamsters (Phodopus sungorus) were maintained prenatally and until weaning (21 days) in either SDs (8 h light:16 h dark) or long days ..
  79. ncbi Photoperiod and social cues influence the medial amygdala but not the bed nucleus of the stria terminalis in the Siberian hamster
    B M Cooke
    Department of Psychology, 3210 Tolman Hall, University of California, Berkeley, CA 94720-1650, USA
    Neurosci Lett 312:9-12. 2001
    ..Cohabitation with a female resulted in MePD volumes indistinguishable from LD males. These results indicate that the MePD, a nucleus implicated in socio-sexual behavior, can respond to photoperiodic as well as to social cues...
  80. ncbi Direct innervation of white fat and adrenal medullary catecholamines mediate photoperiodic changes in body fat
    G E Demas
    Department of Biology, Georgia State University, Atlanta, Georgia 30303-3083, USA
    Am J Physiol Regul Integr Comp Physiol 281:R1499-505. 2001
    ..These results suggest that both adrenal catecholamines and the sympathetic innervation of WAT interact to decrease SD-induced decreased adiposity...
  81. ncbi Photoperiodic regulation of circulating leukocytes in juvenile Siberian hamsters: mediation by melatonin and testosterone
    Brian J Prendergast
    Department of Psychology, The Ohio State University, Columbus, OH 43210, USA
    J Biol Rhythms 18:473-80. 2003
    The reproductive system of Siberian hamsters (Phodopus sungorus) undergoes rapid phenotypic responses to changes in day length that occur around the time of weaning...
  82. ncbi Wheel running affects seasonal acclimatization of physiological and morphological traits in the Djungarian hamster (Phodopus sungorus)
    Frank Scherbarth
    Institute of Zoology, Univ of Veterinary Medicine Hannover, Buenteweg 17, D 30559 Hannover, Germany
    Am J Physiol Regul Integr Comp Physiol 293:R1368-75. 2007
    ..Wheel running was previously shown to influence body mass and torpor in short-day-acclimatized Djungarian hamsters (Phodopus sungorus)...
  83. ncbi Hypothalamic neuropeptide gene expression during recovery from food restriction superimposed on short-day photoperiod-induced weight loss in the Siberian hamster
    Zoe A Archer
    Division of Obesity and Metabolic Health, Rowett Research Institute, Aberdeen, Scotland
    Am J Physiol Regul Integr Comp Physiol 293:R1094-101. 2007
    ....
  84. ncbi Phodopus campbelli detect reduced photoperiod during development but, unlike Phodopus sungorus, retain functional reproductive physiology
    Mary E Timonin
    Department of Biology, Queen s University, Kingston, Ontario, Canada K7L 3N6
    Reproduction 132:661-70. 2006
    Golden (Mesocricetus auratus) and Siberian (Phodopus sungorus) hamsters are widely used as animal models for seasonal reproduction; but M. auratus shows no developmental delay in short days until after sexual maturity, whereas P...
  85. ncbi The circadian clock, light/dark cycle and melatonin are differentially involved in the expression of daily and photoperiodic variations in mt(1) melatonin receptors in the Siberian and Syrian hamsters
    C Schuster
    , CNRS-UMR 7518, , 12, , F-67000 Strasbourg, France
    Neuroendocrinology 74:55-68. 2001
    ..Altogether, these results show that during daily variations, mt(1) melatonin receptor mRNA and protein are differentially regulated, while at the photoperiodic level, the mt(1) protein status depends on mRNA transcription...
  86. ncbi Daily timed melatonin feedings mimic effects of short days on testis regression and cortisol in circulation in Siberian hamsters
    Sara M Hiebert
    Biology Department, Swarthmore College, Swarthmore, PA 19081, USA
    Gen Comp Endocrinol 146:211-6. 2006
    ..to invasive methods (daily injections, timed infusions) and to untimed oral administration in Siberian hamsters (Phodopus sungorus), an important model for the study of photoperiodism...
  87. ncbi Different neural melatonin-target tissues are critical for encoding and retrieving day length information in Siberian hamsters
    B J W Teubner
    Department of Biology, University of Memphis, Memphis, TN 38152, USA
    J Neuroendocrinol 19:102-8. 2007
    ..The SCN and NRe contribute in different ways to the melatonin-based system that mediates seasonal rhythms in male reproduction...
  88. ncbi Hypothalamic thyroid hormone catabolism acts as a gatekeeper for the seasonal control of body weight and reproduction
    Perry Barrett
    Rowett Research Institute, Greenburn Road, Buckburn, Aberdeen AB21 9SB, United Kingdom
    Endocrinology 148:3608-17. 2007
    ..Collectively, these data point to a pivotal role for hypothalamic DIO3 and T(3) catabolism in seasonal cycles of body weight and reproduction in mammals...
  89. ncbi Perinatal influences of melatonin on testicular development and photoperiodic memory in Siberian hamsters
    C R Tuthill
    Department of Psychology, University of California, Berkeley, CA 94720 1650, USA
    J Neuroendocrinol 17:483-8. 2005
    ..Exposure to melatonin perinatally does not appear to organise the neuroendocrine substrate that mediates effects of day length and melatonin on the gonads of adult hamsters...
  90. ncbi Refractoriness to short day lengths augments tonic and gonadotrophin-releasing hormone-stimulated lutenising hormone secretion
    B J Prendergast
    Department of Psychology and Institute for Mind and Biology, University of Chicago, Chicago, IL 60637, USA
    J Neuroendocrinol 18:339-48. 2006
    Siberian hamsters (Phodopus sungorus) undergo reproductive involution following exposure to short winter day lengths...
  91. ncbi The thalamic intergeniculate leaflet mediates locomotor activity-induced reversal of phenotype in photoperiod nonresponsive Siberian hamsters
    David A Freeman
    Department of Biology, University of Memphis, Memphis, TN 38152 3540, USA
    J Biol Rhythms 21:206-13. 2006
    ..Lesioned animals also failed to exhibit the typical short photoperiod-induced gonadal regression and pelage molt. The results implicate the IGL in the mechanism by which running wheel activity can influence photoperiodic responses...
  92. pmc Immune challenge retards seasonal reproductive regression in rodents: evidence for terminal investment
    Zachary M Weil
    Department of Neuroscience, Ohio State University, Columbus, OH 43210, USA
    Biol Lett 2:393-6. 2006
    ..Here, we show that male Siberian hamsters (Phodopus sungorus) challenged with lipopolysaccharide (a component of gram-negative bacteria that activates the immune ..
  93. ncbi Interval timer control of puberty in photoinhibited Siberian hamsters
    Jin Ho Park
    Department of Psychology, University of California, Berkeley, USA
    J Biol Rhythms 21:373-83. 2006
    Puberty, which is markedly delayed in male Siberian hamsters (Phodopus sungorus) born into short day lengths, is controlled by an interval timer regulated by the duration of nocturnal melatonin secretion...
  94. ncbi Effects of photoperiod and melatonin on the development of growth hormone cells and the pituitary-adrenal axis in the Djungarian hamster, Phodopus sungorus
    Y Hira
    Department of Anatomy, Asahikawa Medical College, Japan
    Arch Histol Cytol 64:211-22. 2001
    ..development of GH cells and the pituitary-adrenal axis was morphologically examined in male Djungarian hamsters (Phodopus sungorus) exposed to short days and those kept under long days and receiving daily afternoon injections of ..
  95. pmc Photoperiodic regulation of androgen receptor and steroid receptor coactivator-1 in Siberian hamster brain
    Marc J Tetel
    Center for Neuroendocrine Studies, Program in Neuroscience and Behavior, Department of Psychology, University of Massachusetts, Amherst, MA 01003, USA
    Brain Res Mol Brain Res 131:79-87. 2004
    ..The present results indicate that daylength-induced fluctuations in SRC-1 and AR expression may contribute to seasonally changing effects of testosterone...
  96. ncbi Leptin and seasonal mammals
    K Rousseau
    School of Biological Sciences, University of Manchester, Manchester M13 9PT, UK
    J Neuroendocrinol 15:409-14. 2003
    ..Thus, the long-term seasonal regulation of body weight set point and leptin feedback may operate through separate pathways to those responsible for acute responses to food restriction...
  97. ncbi Maternal transfer of photoperiodic information in Siberian hamsters. vi. effects of time-dependent 1-hr melatonin infusions in the mother on photoperiod-induced testicular development of her offspring
    Bulent Gunduz
    Department of Biology, Abant Izzet Baysal University, Bolu, Turkey
    J Pineal Res 34:217-25. 2003
    ..The timing, and not the duration, of the maternal melatonin signal with respect to the animals' (mother and fetus) circadian day is of crucial importance in the transfer of photoperiodic information from mother to fetus...
  98. ncbi Photoperiodic adjustments in immune function protect Siberian hamsters from lethal endotoxemia
    Brian J Prendergast
    Department of Psychology and Neuroscience, The Ohio State University, Columbus, OH 43210, USA
    J Biol Rhythms 18:51-62. 2003
    ..Siberian hamsters (Phodopus sungorus) exhibit multiple changes in neuroendocrine, reproductive, and immune function after exposure to short ..
  99. ncbi Melatonin regulates energy balance and attenuates fever in Siberian hamsters
    Staci D Bilbo
    Department of Psychological and Brain Sciences, The Johns Hopkins University, Baltimore, Maryland 21218 2686, USA
    Endocrinology 143:2527-33. 2002
    ....
  100. ncbi Melatonin implants disrupt developmental synchrony regulated by flexible interval timers
    M R Gorman
    Department of Psychology, University of California, San Diego, La Jolla, CA 92093 0109, USA
    J Neuroendocrinol 15:1084-94. 2003
    ..The endogenous pattern of melatonin signals adjusts the duration measured by the interval timer to insure that developmental milestones of seasonal cohorts are synchronized with environmental conditions...
  101. pmc Independence of circadian entrainment state and responses to melatonin in male Siberian hamsters
    Michael R Gorman
    Department of Psychology, University of California, San Diego, La Jolla, CA 92093 0109, USA
    BMC Physiol 3:10. 2003
    ....

Research Grants67

  1. PHOTOPERIODIC CONTROL OF NEUROENDOCRINE-GONADAL ACTIVITY
    Fred Turek; Fiscal Year: 1992
    ..Such interventions could be important for regulating the seasonal reproductive cycle of economically useful animals as well as for the treatment of various mood disorders that have been associated with seasonal rhythms in humans...
  2. PHOTOPERIODIC CONTROL OF NEUROENDOCRINE-GONADAL ACTIVITY
    Fred Turek; Fiscal Year: 1993
    ..Such interventions could be important for regulating the seasonal reproductive cycle of economically useful animals as well as for the treatment of various mood disorders that have been associated with seasonal rhythms in humans. ..
  3. HORMONES, BRAIN FUNCTION, AND BEHAVIOR
    George Wade; Fiscal Year: 1993
    ..An attempt will be made to determine whether adipose tissues can serve as an energy buffer and spare reproductive processes from any of these manipulations...
  4. Sex Behavior, Phallic Development and Seasonality
    Irving Zucker; Fiscal Year: 2007
    ..The model species is the Siberian hamster, Phodopus sungorus sungorus...
  5. Processing Photoperiod Information by the Immune System
    Brian Prendergast; Fiscal Year: 2007
    ....
  6. TEMPORAL INTEGRATION OF PHOTOPERIODIC SIGNALS IN MAMMALS
    Michael Gorman; Fiscal Year: 2007
    ..Studies in this area have examined responses of Siberian, Phodopus sungorus, and Syrian hamsters, Mesocricetus auratus, exposed to static long and short day lengths of early summer ..
  7. TEMPORAL INTEGRATION OF PHOTOPERIODIC SIGNALS IN MAMMALS
    Michael Gorman; Fiscal Year: 2009
    ..Studies in this area have examined responses of Siberian, Phodopus sungorus, and Syrian hamsters, Mesocricetus auratus, exposed to static long and short day lengths of early summer ..
  8. TEMPORAL INTEGRATION OF PHOTOPERIODIC SIGNALS IN MAMMALS
    Michael R Gorman; Fiscal Year: 2010
    ..Studies in this area have examined responses of Siberian, Phodopus sungorus, and Syrian hamsters, Mesocricetus auratus, exposed to static long and short day lengths of early summer ..
  9. The Chronobiology of Cohabitation
    Matthew Paul; Fiscal Year: 2007
    ....
  10. CIRCADIAN RHYTHM ENTRAINMENT
    NORMAN RUBY; Fiscal Year: 2004
    ..A remarkable and unique exception to this rule has recently been found in Siberian hamsters (Phodopus sungorus sungorus)...
  11. NEURAL REGULATION OF PREPARTUM CERVICAL RIPENING
    STEVEN YELLON; Fiscal Year: 2009
    ..Thus, our findings are expected to provide new insights about the mechanism of ripening and novel neuroimmune therapeutic approaches to either promote dilation of the cervix or inhibit the incidence of preterm birth. ..