Biological nitrification is a key reaction in the global nitrogen cycle (N-cycle). This title provides a comprehensive and authoritative review that is long overdue, particularly with the groundbreaking discovery of the annamox bacteria. Nitrification is a topic with broad appeal, dues to the importance of nitrification in both natural and engineered systems. This volume offers a logical organization from leading microbiologists at the "cutting-edge" of nitrification studies.