Radioimmunoassay (RIA) is a very sensitive in vitro assay technique used to measure concentrations of antigens (for example, hormone levels in blood) by use of antibodies. As such, it can be seen as the inverse of a radiobinding assay, which quantifies an antibody by use of corresponding antigens. Although the RIA technique is extremely sensitive and extremely specific, requiring specialized equipment, it remains among the least expensive methods to perform such measurements.
Everything American Express is offering during the US Open this year is designed to enhance what tennis fans love about this tournament, said Deborah Curtis, vice president of entertainment and sports marketing at American Express.
US Open Tennis Tickets. US Open Tennis tickets are on sale now! Don't miss your chance to experience the thrilling action live at the USTA Billie Jean King National Tennis Center. Be there in Flushing, New York to see the best players in the world compete for the 2016 US Open Tennis title.t is sure to be an exciting conclusion to the Open, so donât miss a minute of the action. Tickets are still available to the final rounds on Saturday in Flushing, NY starting at as little as $19. 9/4/15 - The US Open Tennis Tournament continues.