Abstract
The value of using reconstituted systems in membrane research is discussed and the structure and cohesion of natural membranes reviewed. The various methods of forming synthetic membrane systems are examined in relation to the different physical measurements which they make possible. The picture of membrane structure which arises from these studies is presented. The use of synthetic membranes in the study of membrane bound enzymes and antibiotics is discussed with particular reference to the transport of small ions across membranes.