Fujita S, Egami N
Radiat Res. 1984 May;98(2):362-9.
Changes in the survival rate in adults and embryos of the pond snail Physa acuta were studied after acute whole-body gamma irradiation. The LD50 value of the adult snails was about 40 kR. The LD50 values of the embryos irradiated 0 and 1 day after oviposition were about 0.9 and 2 kR, respectively. Histological changes in the ovotestis, the number of eggs laid, and their hatchability were examined in the irradiated adult snails. A fall and a subsequent recovery were observed for these characteristics after irradiation with 8 kR of gamma rays. The relative constitution of the germ-cell populations was greatly changed by the same dose of gamma rays. The proportion of immature germ cells was reduced, and the total number of germ cells also diminished 11 days after irradiation. After depletion, the ovotestis was first repopulated with gonia , and then with oocytes, spermatocytes, and spermatids.
研究了急性全身γ射线照射后，急性尖膀胱螺成体和胚胎存活率的变化。成年蜗牛的LD50值约为40 kR。产卵后0天和1天照射的胚胎的LD50值分别约为0.9 kR和2 kR。在接受照射的成年蜗牛中，检查了卵巢睾丸的组织学变化、产卵数量及其孵化率。用8 kR的γ射线照射后，观察到这些特征先下降后恢复。相同剂量的γ射线使生殖细胞群体的相对组成发生了很大变化。未成熟生殖细胞的比例降低，照射11天后生殖细胞总数也减少。耗尽后，卵巢睾丸首先由生殖细胞重新填充，然后由卵母细胞、精母细胞和精子细胞重新填充。
