title: The circadian rhythm in activity of the periodic acid Schiff reaction and of the Mg and Ca content in rat liver in relation to age and season of the year.
abstract: The experiments were carried out on male Wistar rats aged 6, 12 and 24 months, over the four seasons of the year. Analysis of the results obtained in all age groups disclosed that changes in activity of the p.a.S (periodic acid Schiff) reaction and in concentrations of Mg and Ca in the liver showed rhythmic oscillations with a period of 12 hours. The maximal p.a.S reaction activity and of Ca and Mg levels were generally found to coincide throughout all seasons and in all age groups. The rhythms of change in these parameters in 12- and 24-month-old rats showed a phase shift as compared to the 6-month-old animals.
authors.affiliation: II Department of Histology and Embryology, Silesian School of Medicine, Katowice, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Pawlicki
authors.forename: E
authors.initials: E
authors.lastname: Wielgus-Serafinska
authors.forename: G
authors.initials: G
authors.lastname: Nowaczyk-Dura
authors.forename: M
authors.initials: M
authors.lastname: Kaminski
authors.forename: A
authors.initials: A
authors.lastname: Plewka
authors.forename: P
authors.initials: P
authors.lastname: Czekaj
mesh_terms: D000375:Aging; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002940:Circadian Rhythm; D008099:Liver / Q000378:metabolism*; D008274:Magnesium / Q000378:metabolism*; D008297:Male; D010503:Periodic Acid-Schiff Reaction; D051381:Rats; D017208:Rats, Wistar; D012621:Seasons
chemical_list: D008274:Magnesium; D002118:Calcium