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.
Tennis' U.S. Open to be played on Serena (Williams) Time and ESPN's dime. NEW YORK â For once in a pro sport, money is taking a back seat to history, even though a victory in the U.S. Open tennis tournament would be worth $3.3 million for Serena Williams. It is the Grand Slam she most feverishly pursues, although if she does win it, cashing that check won't be bad, either. Even more so than usual, Williams is the talk of this tournament, which is the annual, always-looming grand finale of a grueling year of pro tennis. She is going for the calendar-year Slam.