This volume contains up-to-date information on aldehyde dehydrogenase, alcohol dehydrogenase, short- and medium-chain dehydrogenase, and reductases. Sixty-nine contributions provide a wide variety of information on enzymology, molecular biology, and metabolic aspects of these carbonyl metabolizing oxido-reductases. Much new information is provided, including previously unreported three-dimensional structures of enzymes and new aspects of gene regulation, along with sequence alignments, metabolism and enzyme mechanisms.