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.
American Express Global Business Travel Joint Venture Deal Closed NEW YORK, July 1, 2014 --. The following announcement was distributed yesterday to all American Express and American Express Global Business Travel employees. Today marks the start of an exciting future for American Express Global Business Travel (GBT). I am pleased to announce that we have officially closed the deal on one of the largest transactions in the history of business travel. As of today, GBT begins its next chapter as a stand-alone company.