Skip to search formSkip to main contentSkip to account menu

Circadian Rhythms

Known as: Nyctohemeral Rhythm, Rhythm, Nycthemeral, Rhythms, Nyctohemeral 
The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and… 
National Institutes of Health

Related topics

Related topics

11 relations
Biological ClocksChronotherapyCircadian ClocksSleep

Broader (1)

Biorhythm

Narrower (1)

Diurnal Rhythm

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
Highly Cited
1994
Highly Cited
1994
Biochemical events during initiation of rat hepatocarcinogenesis.
Carcinogenesis is a multistep, multistage process that begins with irreversible, but heritable damage to a single cell. The… 
1990
1990
Diurnal variation of testosterone and estradiol: a source of bias in comparative studies on breast cancer
In this paper we present a study of the diurnal variation of testosterone (T) and estradiol (E2) in women, carried out as part of… 
1984
1984
Diurnal changes in the fraction of 3-hydroxy-3-methylglutaryl-CoA reductase in the active form in rat liver microsomal fractions.
'Initial' and 'total' activities of 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CoA reductase) were measured in cold-clamped… 
Highly Cited
1977
Highly Cited
1977
Parallel shift in circadian rhythms of adrenocortical activity and food intake in blinded and intact rats exposed to continuous illumination.
Twenty-four hour patterns of plasma corticosterone levels and food intake were determined at 3-4 h intervals weekly for 7… 
1977
1977
Effect of oestradiol-17beta exposure on the spontaneous secretion of gonadotrophins in chronically gonadectomized rats.
The effect of oestradiol-17beta (administered in Silastic capsules) on gonadotrophin secretion in long-term gonadectomized rats… 
Highly Cited
1975
Highly Cited
1975
Regulation of intestinal calcium-binding protein calcium intake in the rat.
Analytical gel electrophoresis of the vitamin D-dependent intestinal calcium-binding protein (CaBP) has demonstrated two protein… 
1972
1972
Effect of adrenalectomy on the diurnal variation of hepatic cholesterogenesis in the rat.
The diurnal variation in cholesterol synthesis exhibited by rat liver has been examined in fed, fasted, and adrenalectomized… 
1966
1966
The Fate of Obsessions in Depressive Psychosis
Obsessions may appear for the first time during the course of a depression without having been present before the onset of the… 
1961
1961
Plasma 17-hydroxycorticosteroids in Cushing's syndrome.
Plasma levels of 17-hydroxycorticosteroids (17-OH-CS) during the night and day were studied in 22 cases of Cushing's syndrome… 
1953
1953
The Diurnal Rhythm of Activity of Mayfly Nymphs
1. The activity of Ecdyonurus torrentis Kimm., Heptagenia lateralis (Curt.) and Baetis rhodani (Pict.) has been measured over a…