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A zeitgeber (/ ˈ (t) s aɪ t ɡ eɪ b ər, ˈ z aɪ t-/ (T)SYTE-gay-bər, ZYTE-, German: [ˈtsaɪtˌɡeːbɐ]) is any external or environmental cue that entrains or synchronizes an organism's biological rhythms, usually naturally occurring and serving to entrain to the Earth's 24-hour light/dark and 12-month cycles.
Biological rhythms are endogenous; they persist even in the absence of environmental cues as they are driven by an internal mechanism, the circadian clock being the best characterized. Of the several possible cues, known as zeitgebers (German for 'time-givers'), which can contribute to entrainment of the circadian clock, light has the greatest ...
A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment).
Endogenous: Growing or working from within an organism; intrinsic. Entrainment : The process an organism undergoes when synchronizing endogenous rhythms to a Zeitgeber. Free-Running Period (FRP) : The length of time it takes for an organism's endogenous rhythm to repeat without Zeitgebers in constant conditions (LL or DD).
Chopra says Rodgers was immediately “really trusting” with him and Hughes, adding that throughout their year working together on the documentary, Rodgers “was very open and vulnerable.”
The hypothesis states that each set of these genes would be sufficient to produce endogenous oscillation in cell function; however, each gene set responds differently to light and temporal cues. The per1/cry1 oscillator (morning oscillator) is energized by light and tracks dawn.
Tech billionaire Elon Musk labeled a section of President-elect Trump supporters as “contemptible fools” as the online debate around visas for highly skilled workers on the right intensifies.
Chad Duell is leaving General Hospital with a bang.. The Jan. 6 episode of the long-running soap opera marked the beginning of the 37-year-old actor's exit storyline when his character Michael ...