Some observations on the mechanism of passive transport
Abstract
Certain mixtures of crown ethers are shown to be synergic in promoting three-phase passive transport of alkali-metal picrates. An explanation in terms of rates of crossing the membrane barriers is proposed. For a series of propeller crowns (dinaphthophenylpolycycloalkins) transport is faster for those with steric hindrance (rigid or locked propellers) and a hypothesis consistent with these results is made.