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Table 3 Circadian characteristics of Bmal1:luc rhythms in bear fibroblasts obtained from winter dormant bears and exposed to fetal bovine serum (FBS) or bear serum from different seasons

From: The bear circadian clock doesn’t ‘sleep’ during winter dormancy

Bear ID Period (h) Amplitude (cnts/s)
  FBS Dormant Serum Active Serum FBS Dormant Serum Active Serum
Juv#1 [23.8] 24.7 ± 0.14 23.75 ± 0.07 23.3 ± 0 240 ± 4.21 712 ± 36 571 ± 164
Juv#2 [24] 23.9 ± 0.28 23.05 ± 0.07 23.7 ± 0 273 ± 54.9 1124 ± 58 1008 ± 223
Juv#3 [23.7] 24.5 ± 0.28 23.3 ± 0 23.15 ± 0.07 168 ± 17.9 471 ± 28 514 ± 63
Juv#4 [23.7] 24.5 ± 0.21 23.45 ± 0.07 23.05 ± 0.21 167 ± 18.07 445 ± 29 528 ± 83
Average 24.39 ± 0.13a 23.44 ± 0.12b 22.94 ± 0.11c 234 ± 24a 781 111b 749 ± 101b
  1. Values in brackets represent the period (h) of the same bear’s winter dormant activity rhythm in DD for comparison
  2. a,bDifferent letters within a row are significantly different from each other, p ≤ 0.05
  3. Values are means ± SEM