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Your search keyword '"Semenova-Tian-Shanskaia"' showing total 5 results
Start Over Author "Semenova-Tian-Shanskaia" Topic germ cells
5 results on '"Semenova-Tian-Shanskaia"'

1. [Cytological characteristics of the gonocytes in the course of their migration in early rat embryos].

Author

Semenova-Tian-Shanskaia AG

Subjects
Animals, Cell Movement, Cell Nucleus ultrastructure, Cytoplasm ultrastructure, Female, Gestational Age, Pregnancy, Germ Cells cytology, Rats embryology
Abstract

The work was carried out in 23 rat embryos from 9,5 to the 11th day of development. In 9,5-day embryos the primary sex cells are localized in the mesenchyma of the allantois and in the intestinal entoderm. Later they migrate either with the blood flow or on the surface of cellular layers towards gonad germs which are reached by the 11th day of the intrauterine development. In the course of this process there occur structural and cytochemical changes in gonocyte nuclei. The nucleolus is replaced to the periphery of the nucleus, around it there appears a rim intensively stained with methylene green. Chromatin has a shape of thin threads. These changes of the nuclei seem to be associated with an increased synthesis of r-DNA and hence with the synthesis of substances having the role to prevent the somatic differentiation of primary sex cells in the course of migration.

Published
1976

2. [The sexual primordium (gonoblast), its origin and evolution].

Author

Semenova-Tian-Shanskaia and Knorre AG

Subjects
Amphibians embryology, Animals, Annelida embryology, Arthropods embryology, Ascaridia embryology, Bryozoa embryology, Cell Differentiation, Chemotaxis, Chordata, Nonvertebrate embryology, Echinodermata embryology, Gonads blood supply, Gonads embryology, Gonads metabolism, Histocytochemistry, Humans, Insecta, Invertebrates embryology, Lizards embryology, Mammals embryology, Mice, Mollusca embryology, Nematoda embryology, Terminology as Topic, Biological Evolution, Germ Cells metabolism, Sex Determination Analysis
Published
1972

3. [Primary sex cells of the human fetus in the period of migration to the gonadal rudiments].

Author

Semenova-Tian-Shanskaia

Subjects
Alkaline Phosphatase analysis, Cell Movement, Cell Nucleus, Embryo, Mammalian analysis, Female, Gestational Age, Glycogen analysis, Gonads anatomy & histology, Histocytochemistry, Humans, Methods, Mitosis, Polysaccharides analysis, Pregnancy, Germ Cells analysis, Germ Cells cytology, Germ Cells enzymology, Gonads embryology
Published
1969

4. [Cytological characteristics of the gonocytes in the course of their migration in early rat embryos]

Author

A G, Semenova-Tian-Shanskaia

Subjects
Cell Nucleus, Cytoplasm, Germ Cells, Cell Movement, Pregnancy, Animals, Female, Gestational Age, Rats
Abstract

The work was carried out in 23 rat embryos from 9,5 to the 11th day of development. In 9,5-day embryos the primary sex cells are localized in the mesenchyma of the allantois and in the intestinal entoderm. Later they migrate either with the blood flow or on the surface of cellular layers towards gonad germs which are reached by the 11th day of the intrauterine development. In the course of this process there occur structural and cytochemical changes in gonocyte nuclei. The nucleolus is replaced to the periphery of the nucleus, around it there appears a rim intensively stained with methylene green. Chromatin has a shape of thin threads. These changes of the nuclei seem to be associated with an increased synthesis of r-DNA and hence with the synthesis of substances having the role to prevent the somatic differentiation of primary sex cells in the course of migration.

Published
1976

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