Pasadena-based OpenX Technologies, the developer of Internet ad serving technology, announced this morning that it has acquired LiftDNA, a provider of yield optimization software for online publishers. Financial terms of the acquisition were not disclosed. OpenX said it has already integrated LiftDNA's products into its products, and announced LiftDNA by OpenX will be available immediately. LIftDNA's software works with ad servers to optimize the ads displayed from ad networks. OpenX is venture backed by Accel Partners, Index Ventures and SAP Ventures; the firm recently said it is on course to hit $100M in revenues this year.