This volume contains 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.

Since 1982, our ever-expanding group of investigators has been meeting in exotic parts of the world to discuss aspects of three enzyme systems. The 1996 meeting was no exception. Nearly 90 scientists from 15 countries met in the small city of Deadwood, South Dakota, for four days of stimulating talks and posters and incredible scenery. Once more this meeting reflected the changing trends in biochemical research. At the 1982 meeting most of the speakers discussed isolating new enzymes and trying to characterize them. At this meeting many speakers discussed interpretations of three-dimensional struc ture or regulatory elements of the genes controlling for the tissue-specific expression of the enzyme. Hopefully, readers will find the proceedings of the meeting to be of interest. Though they reflects the scientific information that was presented at the meeting, they do not indicate the level of personal interactions that went on during the meeting. Once again, the willingness of the participants to discuss unpublished data and to share thoughts about the future directions of their research helped make this, like our previous seven meetings, a special scientific experience for those who attended.

Prior to the start of the eighth meeting, I had the good sense to ask Professor Rosa Angela Canuto of Turin, Italy if she would help me organize the ninth meeting. She quickly suggested that both she and Dr. Guiliana Muzio, also of Turin, help plan the meet ing. Each of our previous eight meetings was a unique experience for the participants. The science was always outstanding and the presentations and discussions were excellent. By moving each meeting to a different part of the world we were able to experience exciting foods and cultural aspects of the world in addition to the science. The ninth meeting was no exception. We met from June 18 to 22 in the small mountain city of Varallo, Italy, the birth place of Dr. Canuto. Holding the scientific sessions in a several-hundred-year-old converted mansion and having an afternoon trip to either Lago Maggiore or Monte Rosa made some aspects of this meeting extremely memorable. An additional unique aspect of the social portion of the meeting was our ability to invite the townspeople to share with us a concert performed in an old church. Though the social and cultural aspects of the meeting were outstanding, the pur pose of the meeting was to exchange scientific information about the status of the three enzyme systems.