THE INFLUENCE OF A SINGLE EXPOSURE TO X RAYS UPON THE DEVELOPMENT OF OVARIES IN CHICK-EMBRYOS AND CHICKS

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Probl. Lab. Radiobiol., L'vovsk. Gos. Univ.

OSTI ID:4695698

Denisevskii, A V

Chick embryos and chicks were exposed to x rays (200 and 900 r, at a rate of 52.2 r/min). 59 chick embryos were exposed on the 4th-6th, 9th, and 14th day of incubation, and 92 chicks on the 6th and 11th days after hatching. The number and size of undamaged follicles was estimated on the basis of 25 sections taken from different places in each ovary, the average size of which was calculated separately for each series of experiments. Sections from animals of similar age not exposed to radiation served as controls. In 19-day old embryos which had been exposed on the 4th--5th day of incubation, the differentiation of the cortical layer was delayed. Slight degenerative changes, however, were repaired before the end of incubation. The changes were less marked in animals exposed on the 9th day of incubation. In embryos exposed on the 14th day of incubation, at a time when the germinal layer should begin to develop, it was severely affected. These changes were not repaired by the end of the egg incubation period. In chicks exposed on the 11th day, the oocytes were mostly affected, and after a dose of 900 r only 2 to 3 undamaged oocytes were found in one section. This number of undamaged oocytes was greater after exposure to 600 r and later regeneration could be observed. If the trunk of the chick was shielded and only the head exposed, the formation of follicles was more impaired than after irradiation of the trunk only. These latter experiments were carried out on the 6th and 11th day after hatching. Only in the case of the 11th day irradiation of the trunk was regeneration delayed. (OTS)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-030328
• OSTI ID: 4695698
• Journal Information: Probl. Lab. Radiobiol., L'vovsk. Gos. Univ., Journal Name: Probl. Lab. Radiobiol., L'vovsk. Gos. Univ. Vol. Vol: No. 1
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AGE
ANIMAL CELLS
BIOLOGY AND MEDICINE
BIRDS
CHICKENS
CYTOLOGY
DISTRIBUTION
EMBRYOS
FOLLICLES
GONADS
OOCYTES
OVARIES
QUANTITY RATIO
RADIATION DOSES
RADIATION EFFECTS
REGENERATION
SEX
SHIELDING
VARIATIONS
VOLUME
X RADIATION