The article offers some perspective on the metamorphosis which already began to take place in substantial parts of the chemical industry – a switch from traditional resources such as crude...

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p-terf-Butylcalix[6]arene produces stable monolayers at the air-water interface having a limiting area of 260 A2/molecule and a film thickness of ca. 10 A. Complete removal of the p-tert-butyl groups affords a unique vesicle-forming surfactant, calix[6]arene, which forms membranes having an apparent thickness of ca. 20 ± 5 A.Phospholipid bilayer membranes have attracted considerable attention over the past 25 years as models for biological membranes, microcapsules, and devices for solar energy conversion.3 45"6 In a series of pioneering papers published in the late 1970s and early 1980s, Kunitake and co-workers extended the range of vesicle-forming surfac-(1) Supported by the Division of Basic Energy Sciences of the Department of Energy (DE-FG02-85ER-13403).

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