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.
The US Open Tennis will hold the Womenâs Semifinals on September 7th. The Womenâs Semifinals is looking to be an exciting match and tickets for the event have a low of $93 for seats in the 300-level promenade. Courtside seats in the corner of the Arthur Ashe Stadium are going for a high price of $1400.