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 Championship is set to become the most lucarative and highest paying tennis grand slam in the world after leapfrogging Wimbledon in total prize money fund. US Open 2016 total Prize Money pool will be $46.3 million (10% increase from 2015). Winners of mens and women singles taking home $3.5 million each. Increase in the prize money was confirmed by US tennis Association.