SAN DIEGO -- The San Diego County Board of Supervisors voted Tuesday to buy land for a library in Ramona.

The county will pay a developer more than $404,000 for the roughly half- acre site on Main Street between 12th and 13th streets.

The property is next to more than 6 1/2 acres of land already owned by the county, but the extra half-acre is needed for construction, Supervisor Dianne Jacob said.

Separately, the board honored UC San Diego professor Roger Tsien, who shared the 2008 Nobel Prize in chemistry for discovering fluorescent protein and developing a way to use it to look inside of cells.

The protein can be used as a glowing marker to enable scientists to watch the movements, positions and interactions of tagged proteins.