Available online
Description
The main features of biological clocks are illustrated using plants and animals including man.
The main features of biological clocks are illustrated using plants and animals including man.
| Module code and title: | S321, Physiology of cells and organisms |
|---|---|
| Item code: | S321; 15 |
| First transmission date: | 22-09-1974 |
| Published: | 1974 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:23:00 |
| + Show more... | |
| Producer: | Roger Jones |
| Contributors: | Jurgen Aschoff; John Brady; Norman Cohen; Peter Colquhoun |
| Publisher: | BBC Open University |
| Keyword(s): | Biological clocks; Endogenous timing hypothesis; External timing hypothesis; Human travel; Oyster experiment |
| Footage description: | Norman Cohen introduces the programme. He describes Prof. Frank Brown's study of the 28 day cycle of the oyster and its significance to research on circadian rhythm. Cohen then examines the circadian rhythm of the bean plant. Time-lapse shots of bean plant illustrate the circadian rhythm in operation. Cohen briefly discusses the technique and apparatus needed to study circadian rhythm. Brady shows and explains the apparatus used for measuring circadian rhythm in bean plants. He shows a trace obtained from this apparatus Shots of chipminks in a cage and on a running wheel. Brady shows their activity trace over a 24 hour period and explains its components. Brady next shows activity traces for a 24 hour period of hamsters exposed to a natural day/night cycle and others living in total darkness. The latter activity trace shows the natural frequency of the hamster's clock. Shots of a human experiment of living in an artifical environment. The circadian cycle in humans is shown to be about the same as that of hamsters. Brady next shows the result of a reapplication of normal conditions. Norman Cohen introduces Jurgen Aschoff. Aschoff explains his experiments on the effect of jet lag. Shots of child undergoing a card sorting test and a copy reading test. An animated graph shows the level of performance during various hours of the human day. Peter Colquhoun discusses the post lunch activity drop among humans. Norman Cohen examines briefly an experiment done to test circadian rhythm in shift workers. He shows the results on a graph. Peter Colquhoun continues the discussion of circadian rhythm in shift workers. Shots of a machine shop in action. Peter Colquhoun continues. Norman Cohen sums up. |
| Master spool number: | 6HT/71516 |
| Production number: | 00525_1119 |
| Videofinder number: | 1834 |
| Available to public: | no |
