Abstract
Excessive biotin (cis-tetrahydro-2-oxothieno[3,4-d]-imidazoline-4-valeric acid) intake by female Dermestes maculatus permits protein incorporation into yolk but suppresses embryogenesis during its later stage, presumably due to partial inactivation of egg proteases. Experiments with dietary biotin-carbonyl- 14C suggested that the overdosed vitamin forms a complex with insoluble yolk proteins. The superfluous vitamin does not curtail the activity of acid phosphatase in young embryos. Hide beetles, sterilized by 1·0% dietary biotin, incorporate to their eggs about 2·3 times more biotin than control females, whereas the former excrete about 27·4 times more biotin than the latter. The adults seem to eliminate the vitamin surplus less efficiently than the larvae. The significance of impaired utilization of yolk proteins is discussed as a means for insect chemosterilization.
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