circadian


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circadian

 [ser″kah-de´an, ser-ka´de-an]
denoting a period of one day, or repeating every day; see circadian rhythm.
circadian rhythm sleep disorder a sleep disorder of the dyssomnia group, consisting of a lack of synchrony between the schedule of sleeping and waking required by the external environment and that of the person's own circadian rhythm. The cause is usually environmental, such as rotating shift work or long-distance air travel, but some individuals simply have natural circadian rhythms sharply different from the predominant one of their society.

cir·ca·di·an

(ser-kā'dē-ăn),
Relating to biologic variations or rhythms with a cycle of about 24 hours. Compare: infradian, ultradian.
[L. circa, about, + dies, day]

circadian

/cir·ca·di·an/ (ser-ka´de-an) denoting a 24-hour period; see under rhythm.

circadian

(sər-kā′dē-ən, -kăd′ē-, sûr′kə-dī′ən, -dē′-)
adj. Biology
Relating to or exhibiting approximately 24-hour periodicity.

cir·ca′di·an·ly adv.

cir·ca·di·an

(sĭr-kā'dē-ăn)
Relating to biologic variations or rhythms with a cycle of about 24 hours.
Compare: infradian, ultradian
[L. circa, about, + dies, day]

circadian

Exhibiting a 24 hour periodicity.

Circadian

Pertaining to biological rhythms occurring at approximately 24-hour intervals. Jet lag is caused by a disruption of the human body's circadian clock.
Mentioned in: Jet Lag

circadian

biological rhythms characterized by a repetitive 24-hour cycle

cir·ca·di·an

(sĭr-kā'dē-ăn)
Relating to biologic variations or rhythms with a cycle of about 24 hours.
[L. circa, about, + dies, day]

circadian

denoting a period of about 24 hours.

circadian clock
the daily rhythm of physiological activity as expressed by the Chinese circadian clock. This explains the flow of energy or Qi through the body, via the meridians, each meridian having two hours of maximum and two of minimum function in every day.
circadian rhythm
the regular recurrence of certain phenomena in cycles of approximately 24 hours, e.g. biological activities that occur at about the same time each day (or night) regardless of constant darkness or other conditions of illumination.
References in periodicals archive ?
The results may help explain why caffeine-drinking "night owls" go to bed later and wake up later and may have implications for the treatment of some circadian sleep-wake disorders, said Wright.
This leads to a disruption in circadian rhythms by confusing the body into thinking it is still daytime.
The links between mental health problems and our circadian clocks are perhaps the strongest of all.
During aging, stem cells continue to show rhythmic activity, but reprogram their circadian functions.
It was revealed through a series of physiological tests that vasopressin-expressing cells in the retina were directly involved in regulating circadian rhythms.
The author has used literature from various sources like National Sleep Foundation, National Institute of General Medical Sciences and previous studies on Circadian rhythm to understand the effect of night shift/rotational shift on the employees.
Previous research in the field revealed genes that cycle on and off throughout the day and showed how altering these circadian genes can shift the timing of the cycle and make the circadian rhythm longer or shorter than 24 hours.
PER3 is a protein coding gene that is a part of the mechanism involved in the circadian clock, according to the human gene database GeneCards.
Regarding 2), although inbred mice may be genetically identical, perinatal photoperiods may nevertheless--by imprinting the circadian clock--lead to a differential stability of circadian rhythms.
The report provides brief overview of Circadian Technologies Limited including business description, key information and facts, and its locations and subsidiaries
Even before circadian lighting was discovered, lay people and lighting professionals alike intuitively followed its general premises: Working in a brightly illuminated, cooler color temperature office during the day is associated with efficiency and productivity.