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By John D. Palmer

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The 12-hour dark periods are indicated by the shaded bars on the abscissa. The times of peak cell division are indicated by the falling arrows. Modified from J. W. , J. Gen. Physiol. 45, 69-76 (1961). l i g h t : (i) t h e c l o c k h a s b e e n s t o p p e d ; o r (ii) all t h e i n d i v i d u a l s i n t h e population continue to b e r h y t h m i c , but the peaks of each one's r h y t h m c o m e s o u t o f p h a s e w i t h its n e i g h b o r , w h i c h c a n c e l s o u t t h e unified cycle display of the population.

Plants Figure 2-2 Scanning electron micrograph of Gonyaulax polyhedra. 37 (Courtesy of Bea- trice M. ) To elucidate the persistent nature of the rhythm, algae were maint a i n e d u n d e r u n v a r y i n g c o n d i t i o n s a n d , w h e n t h e p r o p e r levels o f c o n s t a n t i l l u m i n a t i o n w e r e p r o v i d e d , t h e r h y t h m s w e r e f o u n d to p e r sist for s e v e r a l c y c l e s . A t h i g h l e v e l s o f i l l u m i n a t i o n , t h e r h y t h m w a s i n h i b i t e d ; t h i s f e a t u r e , t h o u g h n o t u n d e r s t o o d , is t h e u s u a l effect o f bright light on the expression of biological rhythms.

And Palmer, J. D. (1970). " Academic Press, New York. Bùnning, E. (1973). "The Physiological Clock," 3rd ed. Springer-Verlag, Berlin and New York. Circadian Rhythmicity, (1972). Proceedings of International Symposium at Wageningen. Center for Agricultural Publishing and Documentation, Wageningen, Netherlands. Harker, J. E. (1964). " Cambridge Univ. Press, London and New York. Menaker, M. (1969). Biological clocks. Bioscience 1 9 , 6 8 1 - 6 8 9 . , (1971). " Nat. Acad. Sei. C. Mills, J. , ed.

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