SCOTTSDALE, ARIZONA, December 27 -- Two Chinese high-tech environmental companies have signed up as tenants at Arizona State University's Scottsdale Innovation Center SkySong, according to The Arizona Republic.

Litree Company, which specializes in water purification technology, and Fscreen Sci-tech Co., which is developing solar energy technology, will put their first US operations in SkySong when it opens mid-2007, according to Rob Melnick, associate vice president for economic affairs at Arizona State University.