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Table 1.

Comparisons of TEA and TPA, TMA or TBA fluxes in the LMT, measured sequentially with self-referencing ion-selective microelectrodes

Mean flux (pmol cm-2 s-1)n sitesN tubulesP
TEA 1.88±0.30 15 <0.001 
TMA 0.74±0.22    
TEA 3.01±0.16 20 <0.001 
TPA 1.61±0.07    
TEA 3.57±0.39 27 <0.001 
TBA 1.67±0.10    
Mean flux (pmol cm-2 s-1)n sitesN tubulesP
TEA 1.88±0.30 15 <0.001 
TMA 0.74±0.22    
TEA 3.01±0.16 20 <0.001 
TPA 1.61±0.07    
TEA 3.57±0.39 27 <0.001 
TBA 1.67±0.10    

Values are means ± s.e.m. All tetraalkylammonium compounds were dissolved in saline at a concentration of 100 μmol l-1. The order of presentation of the compounds was reversed for each tubule. TBA, tetrabutylammonium; TEA, tetraethylammonium; TMA,tetramethylammonium; TPA, tetrapropylammonium; LMT, lower Malpighian tubule.

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