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Table 3.

The effect of synthetic leucokinin-VIII on transepithelial electrolyte and fluid secretion in isolated Malpighian tubules of Aedes aegypti

Experimental condition (N tubules)Fluid secretion (nl min−1)[Na+]sf (mmol l−1)[K+]sf (mmol l−1)[Cl]sf (mmol l−1)
Control (10) 0.49±0.04 141.8±9.8 64.9±9.1 204.9±4.7 
Leucokinin-VIII (10) 0.91±0.08 * 100.5±10.7 * 84.8±11.2 * 193.5±3.5 
  Na+ secretion (pmol min−1K+ secretion (pmol min−1Cl secretion (pmol min−1
Control (44)  69.9±8.4 29.3±3.3 100.1±8.7 
Leucokinin-VIII (10)  96.0±16.2 * 72.5±9.3 * 177.9±16.8 * 
Experimental condition (N tubules)Fluid secretion (nl min−1)[Na+]sf (mmol l−1)[K+]sf (mmol l−1)[Cl]sf (mmol l−1)
Control (10) 0.49±0.04 141.8±9.8 64.9±9.1 204.9±4.7 
Leucokinin-VIII (10) 0.91±0.08 * 100.5±10.7 * 84.8±11.2 * 193.5±3.5 
  Na+ secretion (pmol min−1K+ secretion (pmol min−1Cl secretion (pmol min−1
Control (44)  69.9±8.4 29.3±3.3 100.1±8.7 
Leucokinin-VIII (10)  96.0±16.2 * 72.5±9.3 * 177.9±16.8 * 

The concentrations of Na+, K+ and Cl were measured in picoliter volumes of secreted fluid by electron-probe (X-ray) analysis(Pannabecker et al., 1993). Ion secretion rates are the product of fluid secretion and molar concentration. Peritubular concentrations were 151.8 mmol l−1, 3.4 mmol l−1 and 158.0 mmol l−1 for Na+, K+ and Cl, respectively. sf, secreted fluid. *P<0.05.

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