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Figure 1


Fig. 1. Myostimulatory activity of Aedes aegypti allatotropin (AT) on the hindgut (HG) of Triatoma infestans 4th-instar larvae. (A) Changes in the frequency of contraction induced by A. aegypti allatotropin. *Significant difference between pure AT applied at 10–18 mol l–1 and the other groups analysed (P<=0.05). Each bar represents the mean ± s.e.m. of the number of contractions m–1 in one of three experiments performed showing similar results (N=3–5 samples per treatment). (B) Image obtained from a hindgut preparation maintained in saline (Control). (C) The same preparation after treatment with pharmacological concentrations of pure A. aegytpi AT, showing a full and long-term contraction of the HG.





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