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- W2000232844 abstract "Djungarian hamsters ( Phodopus sungorus) exposed to a short-day photoperiod generally respond with a syndrome of physiological and behavioral changes, such as body weight loss and molt to a white pelage. The extent of the short-day-induced responses differs among individuals. Furthermore, some hamsters show no photoresponse. In this study, we sought to determine whether variation in the photoresponse would be associated with circadian function; whether phase angle or free-running period (τ) would differ between responsive and nonresponsive hamsters; and whether changes in these circadian characters would correlate with the extent of weight loss and molt (and the timing of molt onset) in photoresponsive hamsters. Adult hamsters were kept in a short-day photoperiod (9 hr light, 15 hr dark) for 14 weeks, during which time body weight and molt were measured biweekly. Hamsters were then transferred to cages equipped with running wheels; we measured the phase angle of activity onset under a short-day photoperiod and τ in constant dark. Hamsters exhibiting a short-day-induced molt had a significantly shorter τ and a less negative phase angle than nonmolting animals. Hamsters that exhibited weight loss also had a significantly less negative phase angle, but no difference in τ. No significant Pearson's or Spearman's correlation coefficients were found between extent (or timing) of the photoresponse and the circadian characters in responsive hamsters. Although these results indicate that threshold for photoresponsiveness is related to circadian function, the extent (and timing) of the photoresponse may not be." @default.
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- W2000232844 date "1991-06-01" @default.
- W2000232844 modified "2023-10-10" @default.
- W2000232844 title "Evidence for Independence of Circadian Characters and Extent of Photoresponsiveness in the Djungarian Hamster, Phodopus sungorus" @default.
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- W2000232844 doi "https://doi.org/10.1177/074873049100600206" @default.
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