Entrainment

Although the endogenous rhythms are fairly constant over a broad range of temperatures, the timekeeping mechanism has the property of being reset or synchronized, known in chronobiology terminology as entrainment. That is, the rhythm can be advanced or delayed although the cycle has the same length, allowing the organism to coincide its clock to the day phase of environment. Entrainment is easily demonstrable in fungi: In cultures of Pilobolus growing in a petri dish, a single 1/2000-second high intensity light flash was

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