INVESTIGATIONS ON CIRCADIAN-RHYTHM OF ZN++ IN RATS LIVER, KIDNEY AND GONADS

Most of the biological processes occurring in human and animal organis ms are of rhythmical nature. The level of metal content in an organism depends on many factors e.g.: on species, sex, age of the animal and on diet applied. Zn content was examined with regard to age of the ani mal (60- and 100-days old rats) and to season (autumn, spring). The re sults obtained indicate the existence of a 24-hour rhythm of changes i n Zn content in the liver, kidney and gonad. An analysis of the result s was carried out concerning: a) the functional interrelations between organs, b) three different difinitions of metal concentration in orga nism.