the manner in which molecular structure of the carrier and the lipid composition of the membrane modulate the membrane selectivity among monovalent cations has been investigated for nonactin , trinactin , and tetranactin , which differ only in their degrees of methylation , and for membranes made of two lipids , phosphatidyl ethanolamine and glyceryl dioleate , in which `` '' equilibrium '' '' and `` '' kinetic '' '' aspects of permeation , respectively , are emphasized .
C0025249
lipid
C0023779
lipids