¿ OSI Pharmaceuticals Inc., of Uniondale, N.Y., appointed Maurizio Denaro executive vice president, drug development.

¿ Pangea Systems Inc., of Oakland, Calif., appointed Ronald Griffith senior vice president of product development.

¿ Periodontix Inc., of Watertown, Mass., named Phillip Friden vice president, research and development.

¿ Perkin-Elmer, of Norwalk, Conn., named to its board of directors Arnold Levine, president and CEO of Rockefeller University in New York.

¿ Phoenix International, of Montreal, appointed Peter MacLennan vice president, business development, Europe, and Pablo Martinez-Martin medical director of clinical research.

¿ Physiome Sciences, of Princeton, N.J., named Stuart Laermer vice president, business development.

¿ ReGen Biologics Inc., of Redwood City, Calif., appointed Allan Weinstein vice president, sales, marketing and operations.

¿ Rexell Showcase International Inc., of Boca Raton, Fla., appointed Masayuki Komatsu president, RSI Japan KK.

¿ StressGen Biotechnologies Corp., of Victoria, British Columbia, named John Neefe vice president, clinical research and regulatory affairs.

¿ The International AIDS Vaccine Initiative, of New York, appointed Wayne Koff vice president for research and development.