
Fig. 5. Relationships between ammonia flux rates (JAmm, over 6 h) and average PNH3 gradients in individual epithelial preparations of series 3 under (A) asymmetrical conditions with basolateral-to-apical fluxes, (B) symmetrical conditions with basolateral-to-apical fluxes and (C) symmetrical conditions with apical-to-basolateral fluxes. The regression equations are as follows: (A) JAmm=+0.0242PNH3+23.94, r=0.53, N=18, P<0.05; (B) JAmm=+0.0174PNH3+5.52, r=0.74, N=31, P<0.05; (C) JAmm=+0.0313PNH3+30.95, r=0.28, N=27, P>0.05. 1 nmHg=0.133 Pa. FW, fresh water; L-15, L15 medium.