| It acts as the body's principal circadian pacemaker, regulating and entraining daily rhythms of physiology and behavior. |
| Does the positive feedback influence the robustness of the circadian oscillator? |
| The circadian rhythm resides with an infradian rhythm of lunar 28-day cycles, seasonal cycles of cold and hot as well as shifting light and dark. |
| Nonetheless, the circadian clock of plants is currently being dissected and this evidence may be helpful for hypothesis formation. |
| Still slower ultradian rhythms, with a period of 2 h, and circadian rhythms have also been observed. |
| As a consequence, most biological processes, from sleep-wake cycles in people to leaf movements in plants, follow a daily, circadian rhythm. |
