MEMBRANE PERMEABILITY Lipid Bilayer cms、 Biological Memb 102 H2o H2O Ethano→ 10 Ethano乙醇 Boron→ 10-6 ← Boron K+ 10-8 c Na c 10-10 K Na 二10-2 10-4 10-6 10-8 10-10 P cm/s Cl￾K+ Na+ H2O Ethanol Boron Cl￾K+ Na+ Boron H2O Ethanol乙醇 Lipid Bilayer Biological Membrane MEMBRANE PERMEABILITY