Hans Engels has been appointed president and business unit director of DSM Pharmaceuticals Inc. Mr. Engels will continue to be based out of the Greenville, NC facility.     Mr. Engels joined the company in 2000, and most recently served as chief operating officer, DSM Pharmaceutical Products. During his eight years with the company, Mr. Engels served as chief operating officer and site director for DSM Pharmaceuticals, Inc. Prior to joining the company, he was the vice president of production...