SEASONAL CHANGES IN THE BLOOD VALUES OF RANA-TEMPORARIA

Endocrine cells of the gastric mucosa of Rana temporaria L.

The endocrine cells of the gastric mucosa of Rana temporaria have been studied according to the ultrastructure, the staining properties of the granules with Masson Fontana's and Grimelius' silver methods, silver impregnation of Davenport on deplasticised semithin sections and immunocytochemical techniques. Seven different types of endocrine cells have been described. Six were regarded as belong...

Thyroid growth and its relationship to metamorphosis in Rana temporaria.

INTRODUCTION In a previous work on pronephric degeneration, larvae of Rana temporaria from practically the whole range of the metamorphic cycle were studied (Fox, 1962). Metamorphosis in anurans is dependent upon the presence of a functional thyroid gland (Kollros, 1951; Lynn & Wachowski, 1951; Etkin, 1964), and the same specimens have now been used to investigate thyroid growth and development...

Dmrt1 polymorphism covaries with sex‐determination patterns in Rana temporaria

Patterns of sex-chromosome differentiation and gonadal development have been shown to vary among populations of Rana temporaria along a latitudinal transect in Sweden. Frogs from the northern-boreal population of Ammarnäs displayed well-differentiated X and Y haplotypes, early gonadal differentiation, and a perfect match between phenotypic and genotypic sex. In contrast, no differentiated Y hap...

Short communication-Seasonal changes of blood serum ions in Beluga (Huso huso) Cultured in Brackish Water

Short communication-Seasonal changes of blood serum ions in Beluga (Huso huso) Cultured in Brackish Water