You have heard quite a bit to date about approved missions, Gemini, Mercury, and Apollo missions. The talks this morning will be relative to potential future missions which are, as yet, undefined -missions such as Extended Lunar Base Operations, Space Station Operations, Space Base Operations, and, eventually, Planetary Exploration. In some of these long-term missions which are being planned for the future, expendable supplies will not be used. Regenerative life-support systems will be utilized to supply essentials such as oxygen and water. We would like to close this regenerative loop by also regenerating at least part of the food. When we consider the possibility of regenerating food from metabolic wastes, we do so from two approaches: (1) By means of physicochemical means and (2) by biological means. In this context, the first talk will be given by Dr. Jacob Shapira of the Ames Research Center, who will talk about a physicochemical method of regenerating food.