Use of isolated liver cells and kidney tubules in metabolic studies : proceedings of FEBS Advanced Course No. 38, Abbaye de Royaumont, Luzarches, France, July 27-28, 1975 and Symposium on Mitochondrial-Cytosolic Interrelationships in Cell Metabolism, Paris, France, July 26, 1975, sponsored by the Société de chimie biologique and the French Bioenergetics Group