Description: Segment 1 Gilliland introduces Landon. Landon introduces the subject of radioimmunoassay, describing what a powerful analytical tool it can be and giving some examples where it has been used successfully. Time start: 00:00:00:00 Time end: 00:04:57:00 Length: 00:04:57:00 Segment 2 Landon shows a chart which compares how many radioimmunoassay experiments occurred each year in 1968 compared with 1972. A brief film clip of the Technicon Autoanalyzer is shown as well as a photograph of a PDP-11 radioimmunoassay system. A further short film shows a protein-bound iodine machine at work in a laboratory and there is a film showing various mass spectrometers in a laboratory. Time start: 00:04:57:00 Time end: 00:10:33:00 Length: 00:05:36:00 Segment 3 Landon describes how bioassays in general are the best method for measuring hormones. He refers to several detailed charts which show how radioimmunoassays have been used effectively to measure various hormones. Time start: 00:10:33:00 Time end: 00:14:51:00 Length: 00:04:18:00 Segment 4 Landon describes the requirements for a radioimmunoassay and refers to a list of possible reagents. He then discusses the difficulties behind the radioimmunoassay technique. Time start: 00:14:51:00 Time end: 00:19:55:00 Length: 00:05:04:00 Segment 6 Landon describes the structural differences of various hormones, as detected by radioimmunoassay techniques. Time start: 00:25:23:12 Time end: 00:30:40:14 Length: 00:05:17:02. Segment 7 Landon summarises the lecture and discusses possible future developments for immunoassay techniques in general. Short films are shown of the chromato-electrofluoretic system and a laboratory filled with scientists at work on assays. Time start: 00:30:40:14 Time end: 00:38:01:24 Length: 00:07:21:10