Ageing in the honey-bee, Apis mellifera, as related to brain ATPases and their DDT sensitivity |
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Authors: | EY ChengLK Cutkomp |
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Institution: | Department of Entomology, Fisheries, and Wildlife, University of Minnesota, St. Paul, Minnesota, USA |
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Abstract: | The adenosine triphosphatase (ATPase) system in worker honey-bee brains showed an increased activity of 57 per cent in Na+K+ATPase and 63 per cent in Mg2+ATPase from adult emergence to 7 days post-emergence. Mg2+ATPase activity remained about the same throughout the remainder of adult life, while Na+K+ATPase remained the same until the sixth week, when a decline occurred. The percentage mortality of the bees exceeded 90 per cent at the time of decline of Na+K+ATPase. The in vitro inhibition of Mg2+ATPase and Na+K+ATPase by 10 μM DDT was between 40 and 50 per cent and about 20 per cent, respectively. A somewhat greater sensitivity to DDT was determined in brains of older honey-bees. |
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