Search on: CIRCADIAN RHYTHM 
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Descriptor English:   Circadian Rhythm 
Descriptor Spanish:   Ritmo Circadiano 
Descriptor Portuguese:   Ritmo Circadiano 
Synonyms English:   Diurnal Rhythm
Nyctohemeral Rhythm
Twenty-Four Hour Rhythm  
Tree Number:   G07.450.730.190
Definition English:   The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs and stimuli, hormone secretion, sleeping, feeding, etc. This rhythm seems to be set by a 'biological clock' which seems to be set by recurring daylight and darkness. 
Indexing Annotation English:   drug admin based on circadian rhythm = CHRONOTHERAPY: do not coord with CIRCADIAN RHYTHM or DRUG ADMINISTRATION SCHEDULE; jet lag: index JET LAG SYNDROME
See Related English:   Chronotherapy
Photoperiod
 
History Note English:   66(64); DIURNAL RHYTHM was see under CIRCADIAN RHYTHM 1975-85 (Prov 1969-74) 
Allowable Qualifiers English:  
drug effects ethics
genetics immunology
physiology radiation effects
Record Number:   2966 
Unique Identifier:   D002940 

Occurrence in VHL:
 

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