[Application of the criterion of biological time (tau n/tau 0) to the studies of embryogenesis in birds].
It was shown on the example of chick embryo that the number tau 0 (tau n/tau 0) can be recommended as a measure of biological time and, for this purpose, the duration of the minimal mitotic cycle during synchronous cleavage divisions should be determined (in minutes) in various avian species. Based on the preliminary data, one can propose the comparability and similarity of the temporal programs of gastrulation and somitogenesis in the chick embryo and embryos of some fish and amphibians.
Kol'tsov Institute of Developmental Biology, Russian Academy of Sciences, ul. Vavilova 26, Moscow, 119991 Russia. detlafbor@freenet.de
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D000818:Animals; D001717:Birds / Q000196:embryology*; D002455:Cell Division / Q000502:physiology; D002642:Chick Embryo; D004625:Embryo, Nonmammalian / Q000166:cytology; D005260:Female; D005399:Fishes / Q000196:embryology; D008938:Mitosis; D008954:Models, Biological; D013045:Species Specificity; D013997:Time Factors