References in periodicals archive ?
Our study shows that the environmental light-dark cycle is important for health," says Johanna Meijer of Leiden University Medical Center in the Netherlands.
Changes in the times of larval release and hatching of detached eggs after different entrainment light-dark cycles were evaluated using circular statistics (Zar, 1999).
It seems that given the chance, our bodies naturally adjust to the light-dark cycle of the rising and setting sun.
The daily light-dark cycle governs rhythmic changes in the behavior and/or physiology of most species.
The human circadian clock operates on a period about 20 minutes longer than one day, which must be synchronized according to the light-dark cycle of the solar day, due to which someone whose clock runs faster than a solar day must delay it on a daily basis, and vice versa.
For example, in rats, partial damage to the SCN alters the animals' circadian activity rhythm and its pattern of entrainment to light-dark cycles (Pickard and Turek 1985).
Scientists have long felt that in humans, social contacts and other environmental cues play a more significant role than light-dark cycles.
Now, Notre Dame researchers, led by principal investigator Duffield, have undertaken a gene expression analysis of adult female Anopheles gambiae, which were sampled every four hours over a 48-hour period under both environmental light-dark cycles and under constant dark conditions.
In 2002, the researchers published results from tests in which butterflies kept under various light-dark cycles were permitted to fly in the simulator under natural sunlight.
normal light-dark cycles, continuous darkness, or continuous light).
Cyanobacteria maintain their circadian rhythms even when isolated from the naturally occurring daily light-dark cycles of the sun, just like humans.