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The content of alpha-amylase (alpha-1,4-glucan-4-glucanohydrolase, EC 3.2.1.1.) and total soluble proteins of parotid glands (from rats exposed to a photoperiod of 14 hr light: 10 hr dark), have been determined every 2 or 3 hr over 24 hr periods in 15, 25 and 90-day-old rats. In 35-, 45- and 72-day-old rats, determinations were performed only at 0100 and 1400 hr. The alpha-amylase and total soluble protein contents from 90-day-old rats show a circadian variation, with a maximum value at 2200 hr and a minimum at 1400 hr. Parotids from 15- and 25-day-old rats also show a circadian rhythm. The minimum value is recorded at 0100 hr and the maximum at 1400 hr. At day 35 and after, there is an inversion of the amylase rhythm. In immature rats, it appears that alpha-amylase and soluble protein are under the influence of another synchronizer, whose timing is independent of that imposed by mastication of solid food.
E G Sanz, and
N T Vermouth, and
S L Bellavia
July 1968,
Egyptian dental journal,
E G Sanz, and
N T Vermouth, and
S L Bellavia
January 1963,
Biochimica et biophysica acta,
E G Sanz, and
N T Vermouth, and
S L Bellavia
January 1980,
Biology of the neonate,
E G Sanz, and
N T Vermouth, and
S L Bellavia
June 1969,
Archives of oral biology,
E G Sanz, and
N T Vermouth, and
S L Bellavia
September 1974,
Cell differentiation,
E G Sanz, and
N T Vermouth, and
S L Bellavia
May 1993,
Journal of cellular physiology,
E G Sanz, and
N T Vermouth, and
S L Bellavia
January 2001,
Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology,
E G Sanz, and
N T Vermouth, and
S L Bellavia
April 1980,
Pflugers Archiv : European journal of physiology,
E G Sanz, and
N T Vermouth, and
S L Bellavia
January 1993,
Journal of biological rhythms,
E G Sanz, and
N T Vermouth, and
S L Bellavia
January 1976,
Archives of oral biology,
