This volume of Contributions to Nephrology is comprised of papers presented at the 7th International Ammoniagenesis Workshop. The presentations are organized into sections dealing with ammonia-forming enzymes, molecular biological aspects of glutamine metabolism metabolic alterations in acidosis, kidney and brain metabolism of glutamine and other amino acids, hepatic amino acid metabolism, renal utilization of various nitrogenous substances, and interorgan metabolism of ammonia and other substrates. With contributions from leading researchers, this book is a valuable update for scientists working or interested in the field.