Telkonet of Germantown, which provides broadband Internet connections in buildings through electrical wiring, said it agreed to buy a controlling interest in Microwave Satellite Technologies for $10 million in cash and stock. Telkonet's president and chief executive, Ronald W. Pickett, said the acquisition will allow it to add television service starting in Manhattan, where it has contracts in a number of residential buildings, including Trump Place.

Merkle of Lanham, a database marketing agency, acquired Quris of Denver, an e-mail marketing agency, on terms that were not disclosed. Merkle said Quris has developed e-mail marketing for clients including Blockbuster video, the Charles Schwab brokerage and the Wynn Las Vegas resort.

Aurora Flight Sciences of Manassas plans to open a research and development center in Cambridge, Mass., to develop advanced technologies for the unmanned vehicles the company develops for defense and homeland security uses, and to diversify its technology portfolio. The company is an outgrowth of research at the aeronautics and astronautics department at the Massachusetts Institute of Technology in Cambridge.

Noesis of Manassas acquired Defense Holdings of McLean and is taking its name. The combined company will specialize in naval engineering. In what Noesis called "a complex, three-way transaction," the company sold its federal support services, managing programs for government agencies, to ITS of Oxnard, Calif. Terms were not disclosed.

Lafarge North America of Herndon, a diversified supplier of construction materials, said it will build a concrete pipe plant in Edmonton, Alberta, and expand its pipe operations in Calgary, Alberta, and Winnipeg, Manitoba.