Abstract
The glutathione and free sulphydryl levels of eggs and larvae of arsenic-resistant and arsenic-sensitive blue ticks were determined at intervals from 5 days after commencement of oviposition to approximately 18 days after hatching. From 15 to 20 days after commencement of oviposition the glutathione and free sulphydryl level was greater in the arsenic-resistant strain than in the sensitive strain. The combination of several known sulphydryl inhibiting materials with sodium arsenite resulted in a potentiation of arsenic toxicity in respect of adult female ticks. Arsenic-resistant adult female ticks were cross-resistant to some sulphydryl inhibitors.
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