The author wishes to express thanks to Dr. Tadao Nakashima and Mr. Masataka Shimizu for permission to use the pictures from their Manual and to Asahi Glass Inc. for providing information about the availability and prices of SPG, the ozone dissolution system and processing of food emulsions. I also thank Professor Tatsuo Ishikawa (School of Chemistry, Osaka University of Education) for his valuable suggestions and comments. Special thanks to Fuji-Silysia Chemical Ltd. for supplying the SPG membranes.

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