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Revista do Instituto de Medicina Tropical de São Paulo

On-line version ISSN 1678-9946


CARVALHO, Elaine Barros da Costa; MELO, Ana Maria Mendonça de Albuquerque  and  MOTTA, Mauricy Alves da. Gamma 60Co DL50/30 of Biomphalaria glabrata (Say, 1818). Rev. Inst. Med. trop. S. Paulo [online]. 1999, vol.41, n.6, pp.371-374. ISSN 1678-9946.

The variation of resistance to 60Co gamma-rays of Biomphalaria glabrata was studied. A population of 480 mollusks was observed during 30 days - distributed in 8 groups of snails isolated and 8 groups of snails in colonies - after exposure (30 snails per group per dose) to increasing doses of gamma radiation. Doses of 10, 20, 40, 60, 80, 160, 320 and 640 Gy from a Gamma-cell 60Co irradiator, were applied to the test groups and two groups control (non-irradiated) of snails - isolated and colony - were kept apart. After have been exposed, the snails were drew back to the aquaria where they were maintained before. The survival was estimated on a daily score of the alive animals in each group-dose, starting after the irradiation exposure day. As a result, the survival self-fertilization forms (DL50/30 = 218.2 Gy) was found greater than in cross-fecundation forms. These data point to a low radio-resistance on the cross-fertilization forms - the sexual reproductive form - which is most found in nature. The lower radio-resistance of the cross-fertilization forms suggests the presence of some sex-linked hormonal factor related to this phenomenon.

Keywords : Lethal dose; Biomphalaria glabrata; Gamma radiation; Schistosoma mansoni; Radio-resistance.

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