title: The influence of variable gravitational fields on the embryonic development of some ecaudate amphibians.
abstract: The fertilized eggs of the frog Rana temporaria immediately after fertilization were rotated on a clinostat in the vertical plane at the rate of 0.66 rotations per minute with a radius of 20 mm for 2.5 hours. A wide spectrum of developmental anomalies was found (33% in the experiment, 14% in the control) which, in the authors' opinion, result from abnormalities in the cortical reaction of symmetrization. These abnormalities manifest themselves in the irregular distribution of cortical pigment and in eccentric division lines.
authors.affiliation: USSR, Academy of Sciences, Moscow, USSR.
authors.forename: V V
authors.initials: VV
authors.lastname: Popov
authors.forename: L R
authors.initials: LR
authors.lastname: Palmbakh
authors.forename: E V
authors.initials: EV
authors.lastname: Kuznetsov
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology; D019521:Body Patterning; D002970:Cleavage Stage, Ovum / Q000502:physiology; D004625:Embryo, Nonmammalian / Q000002:abnormalities / Q000196:embryology / Q000502:physiology; D005260:Female; D005775:Gastrula / Q000502:physiology; D006112:Gravitation; D008297:Male; D010858:Pigmentation; D011896:Rana temporaria / Q000002:abnormalities* / Q000196:embryology* / Q000502:physiology; D012399:Rotation; D018474:Weightlessness Simulation; D015053:Zygote / Q000254:growth & development / Q000502:physiology