1. The Procter & Gamble Company; Mason Business Center; 8700 Mason Montgomery Road Mason OH 45040 U.S.A.
2. Center for Electron Microscopy and Analysis; The Ohio State University; 1305 Kinnear Road Columbus OH 43212 U.S.A.
3. Procter & Gamble Service GmbH; Berliner Allee 65 D-64274 Darmstadt Germany
4. Department of Chemistry; University of York; Heslington York YO10 5DD UK