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- W96125003 abstract "Radiosensitivity of Drosophila sperm before and after insemination of the egg The radiosensitivity of mature sperm before and after insemination of the egg was determined with respect to the induction of sex-linked recessive lethals and reciprocal translocations. In two separate series, inseminated females and newly laid eggs, respectively, were X-rayed either in air, oxygen or purified nitrogen. The use of a special test system allowed the recessive lethals (including orthodox as well as Y-suppressed lethals) to be registered separately in the maternal and in the paternal X-chromosomes. Using this procedure in both series we also obtained information about the sensitivity of the maternal chromosomes. A comparison of the dose-response relationships for the recessive lethals leads to the following results: The maternal X-chromosome of stage-14 oocytes has about the same sensitivity as that of newly laid eggs. The paternal X-chromosome of mature sperm in the storage organs of the females is less sensitive than the maternal X-chromosome of stage-14 oocytes. In contrast to this, the paternal X-chromosome of sperm which have just penetrated into the egg is more sensitive than the maternal X-chromosome of newly laid eggs. The sensitivity of the sperm after insemination is twice as high as before insemination. These differences are independent of the gas that is present during irradiation. The oxygen enhancement ratios obtained from irradiations of inseminated females are somewhat higher than those obtained from irradiations of newly laid eggs. From these results it is concluded that the doubling of the sensitivity of the sperm after insemination is not caused by an oxygen effect, i.e. by a differential oxygen content of the sperm in the two different environments. We assume that the increase in sensitivity is connected with the histone transformation in the paternal chromosomes during the transition into the pronucleus which is accompanied by a decrease of free SH-groups acting as radiation protectors. The possibility of a differential influence of maternal factors on the X-ray-induced lesions in the paternal chromosomes cannot be excluded." @default.
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- W96125003 date "1972-07-01" @default.
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- W96125003 title "Strahlenempfindlichkeit von drosophila-spermien vor und nach der besamung des eies" @default.
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- W96125003 doi "https://doi.org/10.1016/0027-5107(72)90076-0" @default.
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