Springer Online Journal Archives 1860-2000
Abstract Shielding adult Drosophila melanogaster fruit flies from environmental neutrons with either paraffin wax or boric acid increased the median life span by between 4.6 and 9.7%. The increase in life span was significant only when the shielding began at 14–29 days of adult age. Shielding begun at 1 day of adult age did not result in a significant increase in life span. Shielding with boron during the reproductive, developmental and adult stages, however, resulted in a significant reduction of 11.9% in the median survival time. Environmental background neutrons, therefore, had surprisingly both a negative and positive influence on longevity depending upon the period of life when the exposure occurred.
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