title: Ontogeny of N-acetyltransferase activity rhythm in pineal gland of chick embryo.
abstract: 1. N-acetyltransferase was present in pineal glands of 14-day-old chick embryos though no rhythm either in LL, DD or LD 12:12 was observed in this age. 2. Daily rhythm in pineal NAT activity was found in 18-day-old embryos incubated under LD 12:12 and LD 16:8 but no NAT rhythm was detected in DD or LL. 3. NAT rhythm persists for 2 days in constant darkness and it may be circadian in nature. 4. Presence of melatonin (85 +/- 8 pg/mg tissue) was detected in pineals of 18-day-old chick embryos.
authors.affiliation: Institute of Animal Physiology, Slovak Academy of Sciences, Prague.
authors.forename: M
authors.initials: M
authors.lastname: Zeman
authors.forename: H
authors.initials: H
authors.lastname: Illnerová
mesh_terms: D000818:Animals; D001191:Arylamine N-Acetyltransferase / Q000378:metabolism*; D002642:Chick Embryo; D002940:Circadian Rhythm; D007700:Kinetics; D008550:Melatonin / Q000378:metabolism; D010870:Pineal Gland / Q000196:embryology / Q000201:enzymology* / Q000378:metabolism
chemical_list: D001191:Arylamine N-Acetyltransferase; D008550:Melatonin