Description: Segment 1 Dr Ian Gilliland introduces Professor E W Horton. Horton, seated, talks to camera. He describes how prostaglandins were discovered in the 1930s, then isolated in 1960. He shows a diagram detailing the four main groups of prostaglandins. Referring to further diagrams, Horton shows how the four prostaglandins differ in their biological activities. Time start: 00:00:00:00 Time end: 00:05:57:22 Length: 00:05:57:22 Segment 2 Horton describes the biological function of specific prostaglandins, writing on a chalk board to illustrate his points. He then refers to a diagram which details which parts of the body each prostaglandin type is most likely to be found in. Time start: 00:05:57:22 Time end: 00:10:44:00 Length: 00:04:46:03 Segment 3 Horton shows diagrams which compare the molecules of different prostaglandins. He then refers to experiments in which prostaglandins have been injected into animals. Autoradiographs are shown which detail the results of the experiments. Time start: 00:10:44:00 Time end: 00:16:15:19 Length: 00:05:31:19 Segment 4 Horton talks about the extraction and estimation of prostaglandins. He shows examples of different methods of separating prostaglandins from tissue culture samples. Then, using diagrams, he describes various methods of how to identify different prostaglandins from the tissue samples. Time start: 00:16:15:19 Time end: 00:20:27:22 Length: 00:04:12:03 Segment 6 Horton completes his discussion of methods for estimating prostaglandin levels, then introduces Part Two. Opening credits and titles of Part Two. Time start: 00:24:42:22 Time end: 00:28:20:22 Length: 00:03:38:00. Segment 7 Horton introduces the subject of the pharmacological actions of prostaglandins. He shows four photographs of chicks at various stages of an experiment to inject them with prostaglandins. Graphs and diagrams are used to display the results of the experiment. Time start: 00:28:20:22 Time end: 00:35:53:11 Length: 00:07:32:14. Segment 8 Horton discusses the effects of oestrogen treatments on prostaglandin levels in different animals including guinea pigs and sheep. He presents the results of these experiments by drawing diagrams on a chalk board. Time start: 00:35:53:11 Time end: 00:39:29:19 Length: 00:03:36:08. Segment 9 Horton continues to discuss the effects of different prostaglandins on different animals. He outlines which bodily functions suppress prostaglandin action and which promote it. Time start: 00:39:29:19 Time end: 00:44:53:05 Length: 00:05:23:11. Segment 10 Horton differentiates further between different types of prostaglandin, detailing which types of hormones have the most powerful effect on prostaglandin levels. He uses a chalk board to write various diagrams and equations on. Time start: 00:44:53:05 Time end: 00:49:56:00 Length: 00:05:02:20. Segment 11 Horton sums up the lecture and discusses some final issues about the effects of prostaglandins on the body. Time start: 00:49:56:00 Time end: 00:54:52:21 Length: 00:04:56:21