title: [Sex differences in the gonadotropins of the Black Sea plaice Scophthalmus maeoticus].
abstract: No quantitative differences in the effect of acetone-dried pituitaries from male and female plaice upon loach-recipients (Misgurnus fossilis) have been found in testing the activity of the glands on plaice-recipients. This fact suggests the existence of qualitative differences between gonadotropins from plaice males and females. This conclusion was supported in the experiments on the effect of purified gonadotropic fractions, isolated separately from male and female hypophyses, on maturation of the loach. Three gonadotropic fractions obtained by preparative disc-electrophoresis in polyacrylamide gel, differ in their biological activity and electrophoretic mobility. The activity of gonadotropic fractions in males is higher, than in females; electrophoretic mobility of two fractions is also higher in males, whereas the third fraction does not exhibit sexual differences.
mesh_terms: D000818:Animals; D001681:Biological Assay; D004589:Electrophoresis, Disc; D005399:Fishes / Q000378:metabolism*; D006065:Gonadotropins, Pituitary / Q000032:analysis*; D010902:Pituitary Gland / Q000032:analysis*; D012737:Sex Factors; D014455:Ukraine
chemical_list: D006065:Gonadotropins, Pituitary
vernacular_title: O polovykh razlichiiakh gonadotropinov chernomorskoĭ kambaly-kalkana Scophthalmus maeoticus.