An Introduction to Biological Rhythms - download pdf or read online

By John D. Palmer

ISBN-10: 0125444508

ISBN-13: 9780125444507

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Example text

T h e d e t a i l s o f t h i s m o d e l w i l l b e d i s c u s s e d i n C h a p t e r 7. THE COUPLING UNIT · In t h e e a r l y d a y s o f b i o l o g i c a l r h y t h m s s t u d y , t h e " c l o c k " w a s t h o u g h t to b e s i m p l y a r h y t h m i c s e g m e n t i n t h e c h a i n of c h e m i c a l events underlying an oscillatory process. S o , photosynthetic, biolum i n e s c e n t , a n d m e t a b o l i c r h y t h m s ( C h a p t e r 2) w e r e " d i s s e c t e d " i n search of these rate-altering s u b u n i t reactions.

Acad. Sei. A. 6 8 , 2 1 1 2 - 2 1 1 6 (1971). lengths in constant darkness: o n e h a d a p e r i o d of 19 hours a n d the o t h e r 2 8 h o u r s ( t h e w i l d - t y p e p e r i o d is 2 4 h o u r s i n c o n s t a n t d a r k n e s s ) ( F i g u r e 1-18). All t h e m u t a n t traits a p p e a r e d to i n v o l v e t h e s a m e f u n c tional gene on the X c h r o m o s o m e . D e p e n d i n g on one's interpretation of t h e c a u s e o f t h e a p p e a r a n c e o f c i r c a d i a n p e r i o d s i n c o n s t a n t c o n d i tions, the mutation can b e thought of as changing the basic frequency o f t h e c l o c k p e r i o d , or a c h a n g e i n t h e f o r m o f t h e t e m p e r a t u r e - s e n s i tivity p h a s e - r e s p o n s e rhythm.

T h e c l o c k is a n e n t i t y d i s t i n c t f r o m t h e p r o c e s s e s it c a u s e s to b e r h y t h m i c . T h e t w o are c o n j o i n e d b y a n as y e t u n k n o w n c o u p l i n g mechanism. 12. T h e u n i c e l l u l a r level o f o r g a n i z a t i o n i s sufficient for t h e e x pression of rhythms. 13. I n i n d i v i d u a l o r g a n i s m s — b o t h u n i c e l l u l a r a n d m u l t i c e l l u l a r — t h a t d i s p l a y m o r e t h a n o n e r h y t h m i c p r o c e s s , it is n o t k n o w n w h e t h e r all t h e r h y t h m s a r e d r i v e n b y o n e m a s t e r c l o c k , o r i f e a c h r h y t h m h a s its o w n clock.

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An Introduction to Biological Rhythms by John D. Palmer


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