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Fig. 7. Relationships between the apparent basolateral-to-apical flux rates of NH4+ (as calculated from ammonia flux rates, JAmm, the relevant PNH3 gradient and the regression slopes from Fig. 5A,B as described in the text) and the transepithelial conductance (C, inverse of transepithelial resistance) in individual cultured epithelial preparations of series 3 under symmetrical and asymmetrical conditions. The regression equations are as follows: asymmetrical conditions, NH4+ flux=85.05C–4.61, r=0.68, N=18, P<0.05; symmetrical conditions, NH4+ flux=0.03C+6.21, r=0.01, N=29, P>0.05. 1 nmHg=0.133 Pa. FW, fresh water; L-15, L15 medium.





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