A senior U. S. official met with Indian foreign ministry officials Thursday to discuss cooperation in advanced technology, nearly a month after Washington lifted curbs on high-tech defense exports to this South Asian nation, a U.S. official said. The two countries have identified four sectors for potential collaboration: biotechnology, nanotechnology, advanced information technology and defense technology. Nanotechnology is the manipulation of atoms and molecules to create microminiature equipment. Christina Rocca, the U.S. assistant secretary of state for South Asia, was set to discuss the scope of the planned cooperation with S. Jai Shankar, a joint secretary in India's External Affairs Ministry, and other officials, said David Kennedy, a U.S. Embassy spokesman. "Rocca is head of the U.S.-India implementation group," Kennedy told The Associated Press.