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- W60649448 abstract "Abstract The kinetics of proliferation and killing of spermatogonia of young silkworm larvae during chronic irradiation ( 60 Co or 137 Cs γ-rays, 0.126 or 0.130 R/min for 5 days; total dose, 900 R) was studied. The following kinetic indices were determined at various intervals after the onset of the exposure: ( a ) total viable cell (or gonocyst) counts, ( b ) incidence of pycnosis, ( c ) mitotix index, and ( d ) labeling index, or the percentage of cells that take up [ 3 H]thymidine in 1 h after isotope administration. The results confirm and extend our earlier findings. They indicate the following. 1. ( 1 ) The majority of secondary spermatogonia were killed during chronic irradiation, and only a few of them (12 cysts per testis) survived the exposure when the larvae were irradiated between 5 and 10 days after hatching where the Type II dose-rate effect is observed. 2. ( 2 ) With regard to the primary spermatogonia, there was a considerable suppression of mitosis as well as a block of cells in G 1 entering the S phase during the early intervals after the onset of the chronic exposure starting on day 5 after hatching. This indicates that the distribution of cells at various phases of the cell cycle during chronic irradiation was significantly different from that of unirradiated cell populations to which a single acute dose is generally given to compare the dose-rate effect on mutation induction. 3. ( 3 ) The radiosensitivity of spermatogonia (both primary and secondary) varied, depending upon the developmental stage of the larvae. The earlier the larvae were exposed to chronic irradiation, the less sensitive were the spermatogonia to radiation killing and mitotic inhibition. The significance of these findings to the mechanism of dose-rate effect on mutation frequency in silkworm gonia is discussed." @default.
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- W60649448 date "1966-12-01" @default.
- W60649448 modified "2023-09-30" @default.
- W60649448 title "Cytological evaluation of dose-rate effects of radiation on mutation frequency of silkworm gonia" @default.
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- W60649448 doi "https://doi.org/10.1016/0027-5107(66)90076-5" @default.
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