PHOTOCHEMICAL REACTIVITY OF MOLECULES TRAPPED IN SOL-GEL GLASSES* |
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| Authors: | TILL ROENNEBERG J WOODLAND HASTINGS |
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| Institution: | Department of Cellular and Developmental Biology, Harvard University, Cambridge, MA 02138. |
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| Abstract: | The effects of different wavelengths of light on period, phase shifting, entrainment and after-effects of the circadian clock of the motile marine dinoflagellate Gonyaulax polyedra are described. Phase shifting and entrainment by light can be explained by the action of a single blue sensitive light input pathway. However, tonic effects of light on the period under free-running conditions, and also after-effects on period resulting from single 4 h light exposures, appear to involve two input pathways with different absorption and temperature characteristics. These results suggest different mechanisms for the control of phase and period of the circadian clock. |
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