Table 1 The unitary pore water permeability pf and the Gibbs activation energy barrier ΔG‡t are intricately linked (Eq. 3).

Membrane porepf (cm3 s–1)
(measured)		ΔG‡t (kcal/mol)
(measured)		r (s–1)
(calculated
from ΔG‡t)		pf,c (cm3 s–1)
(calculated
from ΔG‡t)		pf,c/pf
Aquaporin-15.3 × 10−13 (5)3.1 (12)5.3 × 10101.6 × 10−123.0
Aquaporin-Z2.9 × 10−13 (5)4.0 (13)1.2 × 10103.5 × 10−131.2
KcsA5.3 × 10−14 (5)5.1 (8)1.8 × 1095.4 × 10−141.0
Gramicidin A1.6 × 10−14 (14)6.1 (15)3.3 × 1081 × 10−140.6
Carbon nanotubes6.8 × 10−13 (1)24.1 (1)2.1 × 10−56.2 × 10−289.1 × 10−16